EP3467255A1 - Porte-burin - Google Patents

Porte-burin Download PDF

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Publication number
EP3467255A1
EP3467255A1 EP18197493.2A EP18197493A EP3467255A1 EP 3467255 A1 EP3467255 A1 EP 3467255A1 EP 18197493 A EP18197493 A EP 18197493A EP 3467255 A1 EP3467255 A1 EP 3467255A1
Authority
EP
European Patent Office
Prior art keywords
centering
holder
chisel
bit
receptacle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18197493.2A
Other languages
German (de)
English (en)
Other versions
EP3467255C0 (fr
EP3467255B1 (fr
Inventor
Karsten Buhr
Andreas Jost
Thomas Lehnert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wirtgen GmbH
Original Assignee
Wirtgen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wirtgen GmbH filed Critical Wirtgen GmbH
Publication of EP3467255A1 publication Critical patent/EP3467255A1/fr
Application granted granted Critical
Publication of EP3467255C0 publication Critical patent/EP3467255C0/fr
Publication of EP3467255B1 publication Critical patent/EP3467255B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
    • E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools
    • E01C23/088—Rotary tools, e.g. milling drums
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E21C35/193—Means for fixing picks or holders using bolts as main fixing elements
    • E21C35/1933—Means for fixing picks or holders using bolts as main fixing elements the picks having a cylindrical shank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/186—Tools therefor, e.g. having exchangeable cutter bits
    • B28D1/188—Tools therefor, e.g. having exchangeable cutter bits with exchangeable cutter bits or cutter segments
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E21C35/191—Means for fixing picks or holders for fixing holders

Definitions

  • the invention relates to a bit holder for a tillage machine, in particular a road milling machine, with a support body on which a holding portion is formed in the region of a processing side, in which a bit holder for receiving the shank of a round shank bit is formed, wherein the holding portion facing away from the support body at its End of a chisel recording enclosing wear surface for installation of the round shank chisel or a support element is completed, the bit holder is transferred via an obliquely to the central longitudinal axis of the bit holder aligned centering a Zentrier technique directly or indirectly in the wear surface and wherein on the opposite side of the holding section a plug-in approach to Attachment of the chisel holder is integrally formed on a base holder to the support body.
  • tillage machines To carry out milling work on hard surfaces, for example on roads, tillage machines are used. These each have a rotating milling drum. Attached to the milling drum is a multiplicity of chisels which penetrate into the substrate by the rotation of the milling drum and remove it. The chisels are subject to high wear. It is therefore known to replace the bit replaceable on a Fräswalzenrohr the milling drum.
  • base supports can be firmly attached to the milling drum tube, for example by means of welding. On such a base support then a chisel holder can be releasably attached.
  • the chisel holder has a chisel holder, in which a chisel can also be detachably mounted.
  • Worn bits can be easily exchanged. If the chisel holder is worn after several chisel changes, it can be detached from the base holder and replaced. It is known to support the chisel rotatable about its longitudinal axis and axially blocked in the chisel holder. During the milling process, the chisels rotate about their longitudinal axes, whereby a chisel point engaging in the ground or a chisel head is worn evenly over its circumference. In order to absorb forces acting axially, the bit head rests against the bit holder directly or with the interposition of a support element.
  • the bit holder is subject to increased wear in the region of the support of the bit head or of the support element.
  • strong lateral forces also act on the chisel during tillage. These lead to uneven wear of the chisel holder in the region of the support of the chisel head or the support element. Furthermore, they lead to high forces in the transition from the bit holder to the base holder. If the chisel holder wears unevenly, the free rotation of the chisel is limited. In particular, this tends to block. However, if the rotation of the chisel is limited, it no longer uses it in the desired manner uniformly along its circumference. Rather, a one-sided wear, which leads to premature tool failure.
  • a chisel in particular round shank chisel, known with a chisel head and a chisel shaft.
  • the chisel is held with its chisel shank in a cylindrical chisel holder of a holding attachment of a chisel holder.
  • the drill collar is rotatable by means of a fastening sleeve about its central longitudinal axis, but axially blocked, mounted in the bit holder.
  • the chisel head which is larger in its diameter relative to the chisel shaft, lies over a disk-shaped support element on the front side and circumferentially to the chisel receiver on a wear surface of the holding shoulder.
  • the holding approach is cylindrical.
  • the holding lug is connected to a base part of the chisel holder.
  • the base part extends transversely to the holding approach.
  • Laterally offset and opposite to the Retaining an approach is formed on the base part a plug-in approach. This serves to attach the chisel holder to a base holder of a milling drum described above.
  • the bit holder is designed as a through hole. It penetrates the retaining approach.
  • the chisel holder expands to a centering receiver.
  • the surface of the centering receiver is aligned obliquely to the central longitudinal axis of the bit holder. It goes over a bead in the wear surface of the holding approach. The bead protrudes beyond the wear surface.
  • the holding approach facing surface of the support member is formed complementary to the end face of the holding lug.
  • the support member rests with a seating surface on the wear surface of the retaining lug.
  • a circumferential groove is formed in the support element, which receives the bead.
  • a projecting beyond the seat centering approach of the support element engages positively in the centering of the chisel holder. By the engagement of the spigot in the centering and the bead in the groove, the support element is guided in the radial direction.
  • From the EP 1 427 913 B1 is an assembly with a rotatable cutting bit and a disc known.
  • the disc has on its front of the cutting bit facing the front ribs and on its opposite rear recesses, whereby the rotatability of the disc is improved about its center axis.
  • On its back is circumferentially and adjacent to a central bore formed a centering approach with an inclined to the center axis surface.
  • the centering projection engages in a chamfer which is attached to the end of a cylindrical chisel holder of a chisel holder.
  • the chamfer is only slightly over the back of the disc.
  • the centering projection can be disengaged from the chamfer, so that its lateral guidance is lost. This leads to increased wear of both the disc and the chisel holder, especially at high lateral forces acting on the chisel.
  • the object of the invention is achieved in that a measured in the direction of the central longitudinal axis centering, which is designed between one of the wear surface opposite end of the centering and a maximum point of a projecting beyond the wear surface approach such that the ratio between the inner diameter of the bit holder and the Centering height is less than 8 and / or that the centering height is greater than an axial clearance mounted in the bit holder round shank bit and that the support body on its side facing away from the holding portion has one or more Abtrag vom, wherein the one Abtrag instruments extends on both sides of a median plane, the the center axis receives and which extends in the direction of the feed direction, or that extends on both sides of this center plane in each case at least one removal surface
  • the centering serves to receive and guide a spigot of a support member, as may be arranged between a round shank bit and the holding portion of the bit holder, or a directly integrally formed on the round shank centering approach when it rests against the holding portion without interposed support member.
  • the centering projection is formed in its shape complementary to the centering and is about a bit holder facing the surface (seat or support surface) of the support element or of the chisel head over. The spigot is thus in engagement with the centering. As a result, the support element or the round shank chisel is guided radially.
  • the axial play is larger with large round shank chisels with correspondingly large chisel shanks than with comparatively small round shank chisels. This is supported by the specification of the ratio between the inner diameter D i of the bit holder and the centering. A good lateral guidance of the support element or of the round shank chisel is thus ensured at maximum within the axial play from the bit holder pulled-out chisel for all chisel sizes used. Due to the small lateral movement of the support element and the round shank chisel the length wear of the holding portion of the chisel holder can be kept low.
  • the support body has on its side facing away from the holding section at least two Abtrag lakeschreib forming Abtrag lake (first or second Abtrag lake) which are at an angle to each other.
  • This Abtrag lake lie with mounted chisel holder on corresponding support surfaces of the base holder to which the bit holder is attached with its plug-in approach.
  • the removal surfaces are preferably aligned in such a way that the forces to be transferred from the removal surfaces to the support surfaces are aligned essentially in the direction of the surface normal of one of the removal surfaces or the support surfaces.
  • the bit holder By standing at an angle to each other and a Abtrag schizophreniaschreib forming Abstützmati the support body and thus the bit holder can be preferably formed symmetrically.
  • the bit holder can thus be used on all positions of the milling drum, which are mirror images of each other, for example, on the opposite sides of the milling drum.
  • the centering leads in cooperation with the spigot also to a labyrinth-like seal. This reduces the wear of the bit.
  • the sealing effect can be further improved by arranged on the wear surface lugs, which engage in corresponding recesses.
  • the ratio between the inner diameter D i of the bit holder and the centering height is less than 7.5, preferably less than 7.0, more preferably less than 6.5.
  • a good lateral guidance is also achieved in the case of transverse forces acting directly on the support element or the round shank bit, for example due to abutting waste material.
  • the lateral guidance is again improved, so that the simultaneous action of axially aligned, unevenly distributed over the support member forces and radial-acting transverse forces does not lead to a wobbling motion of the support element with a high wear caused thereby.
  • a radially acting guide of the support element and / or the round shank chisel at the same time good rotation of the support member and / or the chisel can be achieved, that the approach is arranged circumferentially to the chisel holder.
  • the lateral guidance of the support element can be further improved in that a plurality of approaches the same or different height are formed on the wear surface of the holding portion and that the ratio between the inner diameter D i of the bit holder and the centering height to one of the lugs, preferably the ratio between the inner diameter D i the Chisel recording and the largest intended to approach a centering height, is less than 8.
  • a further improvement of the lateral guidance can be achieved in that a guide groove is spaced and formed circumferentially to the centering receptacle in the adjacent wear surface.
  • the guide groove makes it possible that an integrally formed on the support element or the round shank chisel guide web engages in this. This improves the rotatability of the support element or of the round shank chisel, which leads to a reduced length wear of the holding section of the chisel holder.
  • Good rotatability of the support element or the round shank chisel can be achieved in that the approach between the centering and the guide groove is formed and that the centering with respect to the adjacent wear surface has a greater depth than the guide. It is thus achieved a triple radial guidance of the support element or the round shank chisel on the bit holder, namely in the region of the centering, on the approach and on the guide groove.
  • the rotatability of the support element or of the round shank chisel can be further improved in that transitions between the centering surface, the wear surface, the projection and / or the guide groove run continuously or rounded. Sharp and blocking the rotation edges are avoided
  • a good lateral guidance of the support element or the round shank chisel can result from the fact that the height of the approach to the wear surface is greater than or equal to 0.3 mm, preferably between 0.3 mm and 2 mm, more preferably between 0.5 mm and 1 , 5 mm, is. With an approach smaller than 0.3 mm can not achieve sufficient improvement of the lateral guidance of the support element or the round shank chisel. With an approach in the range between 0.3 mm and 2 mm, a good lateral guidance of the support element or round shank chisel can be achieved. In particular approaches with a height between 0.5 mm and 1.5 mm lead to a good rotation of the support element or the round shank chisel.
  • the inner diameter D i is 20 mm and the centering height is greater than 2.5 mm and / or that the inner diameter D i is 22 mm and the centering height is greater than 2.75 mm and / or that the inner diameter D i is 25 mm and the centering height is greater than 3.125 mm and / or that the inner diameter D i is 42 mm and the centering height is greater than 5.25 mm.
  • chisel adapters with an inner diameter D i of 20 mm or 22 mm and a centering height of at least 2.5 mm or 2.75 mm are suitable.
  • chisels of medium size are chisel holder with an inner diameter D i of 25 mm and a centering height of 3.125 mm suitable.
  • large chisel and associated toolholder bit receptacle can be used with a centering height of at least 5.25 mm with an inner diameter D i of 42 mm.
  • suitable centering approaches are provided for all popular sizes of the support elements and the round shank chisel. This ensures that, for example, larger chisels with correspondingly larger occurring Forces and a larger axial play of the bit sufficient lateral guidance of the support elements or the chisel is present.
  • Suitable lugs or guide grooves may be provided by attaching the lug and / or the guide groove to the wear surface by a machining process in the manufacture of the chisel holder. If the projection and / or the guide groove are already attached to the wearing surface during the production of the bit holder, then the bit shaft and the bit holder are already protected at the beginning of operation by the formed, labyrinth-like seal against entering contaminants. The good lateral guidance is already given when the chisel holder is new, so that there is little wear right from the start.
  • the derivation of forces acting on the bit transverse forces on the bit holder on the base holder can be improved by the support body has at least one further removal surface, which is at an angle to the two Abtrag vom the Abtrag vomlibs.
  • the at least three, more preferably four removal surfaces are preferably oriented in such a way that at least one of the surface normals of the removal surfaces extends at least approximately in the direction of the force effect in the case of possible transverse forces.
  • the force can thus preferably be transferred from the transverse to their aligned Abtrag vom on the base holder. It is achieved a significant relief of the plug neck of the chisel holder.
  • FIG. 1 shows in a perspective side view of a releasably connected to a base holder 10 bit holder 20.
  • the base holder 10 is closed by a concave lower end side 11. With this end face 11, the base holder 10 can be attached to a not shown Fräswalzenrohr a tillage machine, in this case a road milling machine.
  • the base holder 10 is preferably welded to the Fräswalzenrohr.
  • a base body 13 of the base holder 10 has in the working direction in front two at an angle and, relative to a central longitudinal plane of the base holder 10, symmetrically arranged to each other inclined surfaces 15.
  • inclined surfaces 14 go over at an angle in side surfaces of the base body 13.
  • the side surfaces are preferably parallel to the working direction of the base holder 10 during operation aligned with a milling drum. Due to the arrangement of the inclined surfaces 15, the inclined surfaces 14 and the adjoining side surfaces of the space material is laterally past the base holder 10.
  • the bit holder 20 has a support body 21 which is closed at the front of a skirt 22. Facing away from the base holder 10 is a holding portion 30 integrally formed on the support body 21.
  • the holding portion 30 is cylindrical. Opposite to the support body 21, the holding portion 30 is closed by a wear surface 31.
  • the wear surface 31 is arranged circumferentially to a chisel holder 32 of the chisel holder 20.
  • the bit receptacle 32 is formed by a cylindrical bore. She is along one in the Figures 6-15 aligned center longitudinal axis M aligned.
  • the bit receptacle 32 expands at its end facing the wearing surface 31 in the region of a centering receptacle 33 in the shape of a bevel.
  • the centering receptacle 33 Surrounding the centering receptacle 33 is a present bead-shaped projection 34 formed on the wear surface 31 and projects beyond this parallel to the central longitudinal axis M.
  • wear marks 30.1 are provided on the outer surface of the holding portion 30 .
  • the wear marks 30.1 are presently designed as circumferential grooves. They are arranged at different distances to the wear surface 31. A length wear of the holding portion 30 can be recognized and evaluated based on the wear marks 30.1.
  • the bit holder 20 is symmetrical to one in the FIGS. 3 and 4 shown median transverse plane MQ formed this median transverse plane MQ takes the central longitudinal axis M of the bit receptacle 32 and extends in the direction of feed direction V, as the FIGS. 3 and 4 reveal.
  • the base support 10 facing away from the surface of the support body 21 and the skirt 22 form Ableit vom for the space material. These are aligned obliquely to the median transverse plane MQ, so that in the working direction in front of the holding portion 30 a aligned in the direction of the median transverse plane MQ web 26 is formed.
  • FIG. 2 shows the in FIG. 1 shown basic holder 10 with the bit holder 20 in an exploded view.
  • a plug-in projection 40 to the Support body 21 integrally formed.
  • the insertion projection 40 is connected in the working direction V of the bit holder 20 offset from the holding portion 30 with the support body 21. It is aligned in the direction of its longitudinal extension to the base holder 10 out.
  • two contact surfaces 41 of which only one can be seen in the selected perspective, project over the surface of the plug-in projection 40 in the direction of operation.
  • a pressure screw receptacle 42 Contrary to the working direction can be formed in the form of a recess in the plug-in approach in the context of the invention, a pressure screw receptacle 42.
  • the pressure screw receptacle 42 is preferably closed in the direction of the base holder 10 by a pressure surface 42.1 running obliquely to the longitudinal extent of the plug projection 40.
  • the base holder 10 is penetrated by a plug-in receptacle 16.7.
  • the plug-in receptacle 16.7 is aligned in the direction of the insertion projection 40 of the chisel holder 20. It serves to receive the plug-in projection 40.
  • a threaded receptacle 18 is obliquely formed to the plug-in receptacle 16.7 extending into the base holder 10. It opens at the end into the plug-in receptacle 16.7.
  • the threaded receptacle 18 is associated with a pressure screw 50.
  • the pressure screw 50 has a threaded portion 51, a tool holder 53 and the tool holder 53 opposite a pressure projection 52. It can be screwed into the threaded receptacle 18 of the base holder 10 such that the pressure projection 52 projects into the plug-in receptacle 16.7.
  • the plug-in receptacle 16.7 merges into first support surfaces 16.1. These are obliquely sloping towards the plug-in receptacle 16.7 and oriented symmetrically to a center plane of the base holder 10.
  • a surface 17 Surrounding the threaded receptacle 18, a surface 17 is formed. This is bounded laterally by protruding beyond the surface 17 projections.
  • second support surfaces 16.2. These are at an angle to each other and obliquely sloping to the plug-in receptacle 16.7 and the center plane of the base holder 10 aligned. They are further arranged at an angle to the first support surfaces 16.1.
  • the first and second support surfaces 16.1, 16.2 thus each form prism-shaped mutually aligned Contact surfaces for the support body 21 of the bit holder 20 from.
  • first and the second support surfaces 16.1, 16.2 are aligned at an angle to each other and sloping sloping towards plug-in receptacle 16.2.
  • the support surfaces 16.1, 16.2 are Nachsetzschreib 16.3, 16.4, 16.5 formed in the form of depressions. Trained between the second support surfaces 16.2 Vietnamesesetzraum 16.5 passes over a recess 16.6 in the threaded receptacle 18 limiting surface 17 via.
  • the plug-in receptacle 16.7 and the adjacent support surfaces 16.1, 16.2 form a bit holder receptacle 16.
  • FIG. 3 shows the in the FIGS. 1 and 2 shown bit holder 20 in a front view and FIG. 4 in a rear view.
  • the feed direction V and thus the working direction of the chisel holder 20 are in the FIGS. 3 and 4 marked by the usual arrow depiction.
  • the median transverse plane MQ running in the feed direction V forms a plane of symmetry of the bit holder 20.
  • first Abtrag vom 23 from in the feed direction V facing apron 22 of the support body 21 on its side facing the plug approach 40 two angularly aligned to each other, first Abtrag vom 23 from.
  • the first removal surfaces 23 are preferably arranged mirror-symmetrically to the central transverse plane MQ. Also conceivable is an asymmetrical arrangement.
  • the removal surfaces 23 are aligned obliquely to the median transverse plane MQ.
  • the first removal surfaces 23 form a first removal surface pair. Between the first removal surfaces 23, a transition section 23.1 may be provided.
  • the first removal surfaces 23 preferably pass over a rounding transition 23. 2 into the insertion projection 40.
  • the insertion projection 40 has in the feed direction V, the two arranged in mirror image to the median transverse plane MQ contact surfaces 41. These can be separated from each other by a recess 43.
  • the support body 21 forms on its rear side relative to the feed direction V on its the plug-in approach 40 facing surface second Abtrag vom 24.
  • the second removal surfaces 24 are angled and, relative to the median transverse plane MQ, preferably mirror images of each other aligned.
  • the second removal surfaces 24 can also be on both sides of the median transverse plane MQ, where they do not have to be mirror images of each other.
  • the second removal surfaces 24 form a second removal surface pair. They may for example be separated from one another by a throat-shaped transition section 24.1.
  • the transition section 24.1 can preferably extend along the median transverse plane MQ of the bit holder 20.
  • the chisel receiver 32 designed as a through-hole opens into the transition section 24.1.
  • a throat-shaped flushing channel 25 is guided to the bit receptacle 32.
  • the flushing channel 25 forms a radially oriented opening of the bit receptacle 32.
  • the first removal surfaces 23 can be interpreted as removal surfaces of the removal surface pair and one or both of the second removal surfaces 24 as a further removal surface (-n).
  • the two second removal surfaces 24 can also form the removal surfaces of the removal surface pair, and one or both first removal surfaces 23 then form the further removal surface (-n). Subsequently, the terminology first / second ablation surfaces 23/24 will continue to be used
  • the plug-in projection 40 is inserted into the receptacle 16.7 until the support body 21 rests with its first Abtrag vom 23 on the first support surfaces 16.1 and with its second Abtrag vom 24 on the second support surfaces 16.2 of the base holder 10.
  • the removal surfaces 23, 24 and the associated support surfaces 16.1, 16.2 are aligned in each case correspondingly the same.
  • the pressure screw 50 is screwed into the threaded receptacle 18 on the base holder 10.
  • the pressure lug 52 engages in the pressure screw receptacle 42 of the plug-in extension 40 and abuts the pressure surface 42.1 at the end.
  • the bit holder 20 is thus axially blocked by the pressure screw 50.
  • the pressure screw 50 pushes through her obliquely to Longitudinal extent of the plug-in extension 40 extending alignment this with its contact surfaces 41 against the wall of the socket 16.7.
  • the pressure screw 50 braces the first and second removal surfaces 23, 24 with respect to the associated first and second support surfaces 16.1, 16.2.
  • the inclined to the insertion projection 40 extending Abtragvid 23, 24 allow for acting from different directions on the bit holder 20 transverse forces and varying, against the feed direction V forces acting an optimized force transfer to the base holder 10, since at least one of the Abtrag Jerusalem 23, 24 with its surface normal is oriented approximately in the direction of the acting, resulting force.
  • the transfer of force from the bit holder 20 to the base holder 10 thus takes place to a large extent by the removal surfaces 23, 24 on the corresponding support surfaces 16.1, 16.2.
  • the plug-in projection 40 in particular in its transition region to the support body 21, relieved. Premature fatigue breakage of the plug-in extension 40 can thus be avoided.
  • FIG. 5 shows a section of a tool system, each with a section of the holding portion 30 of the chisel holder 20, a support member 70 and a tool holder 20 held in the round shank 60th
  • a chisel head 61 of the round shank chisel 60 is closed in the direction of the holding portion 30 of the chisel holder 20 with a collar 62.
  • the collar 62 forms in the direction of the holding portion 30 a bearing surface 62.1. This rests on a support surface 72 of the support element 70.
  • the support surface 72 is formed within a receptacle 71 on the top of the support member 70. It is correspondingly limited on the outside by an edge 71.1.
  • the support member 70 has a seat surface 73, with which it rests on the wear surface 31 of the holding portion 30 of the chisel holder 20.
  • the support element 70 is constructed substantially rotationally symmetrical to a central longitudinal axis of the round shank chisel 60.
  • the seat surface 73 extends over a peripheral recess 75 in a centering counter surface 74. 1 of a centering projection 74, which is inclined relative to the central longitudinal axis of the support element 70 over.
  • the centering lug 74 of the support member 70 is inserted into the correspondingly shaped centering seat 33 of the chisel holder 20.
  • the Zentrier ought constitutional matter 74.1 is located on a corresponding centering surface 33.1 of the centering 33 at. In the recess 75 of the projection 34 of the holding portion 30 engages.
  • the support element 70 has a receiving bore 77, through which a guide region 76 for guiding the round shank chisel 60 is formed.
  • a centering section 63 of a drill collar of the round shank chisel 60 is assigned to the guide region 76.
  • the guide portion 76 and the centering 63 a pivot bearing. It is important to ensure that the outer diameter of the cylindrical centering 63 is matched to the inner diameter of the receiving bore 77 in the guide portion 76 that a free rotation between the support member 70 and the centering 63 is maintained.
  • the clearance between these two components should be chosen so that the smallest possible lateral offset (transverse to the central longitudinal axis of the round shank chisel (60)) occurs.
  • the centering section 63 merges after a tapering region 63.1 into the cylindrical bit shaft concealed by a fastening sleeve 64 in the present case.
  • the drill collar is held axially by means of the fastening sleeve 64 in the bit receptacle 32 on the holding section 30 of the bit holder 20.
  • the holder allows an axial play 80.
  • the mounting sleeve 64 has a chamfer.
  • the round shank bit 60 can rotate about its central longitudinal axis.
  • the free rotation ensures that the round shank chisel 60 wears evenly over its entire circumference.
  • the support element 70 which is loosely placed and held by the centering section 63 of the tool shank, also rotates, as a result of which the rotatability of the round shank chisel 60 as a whole is further improved. Due to the rotation and the high mechanical load of the round shank chisel 60 wear occurs Chisel holder 20, mainly in the upper portion of the holding portion 30. By the load, the wear surface 31 is abraded. The present wear of the holding portion 30 can be evaluated via the wear marks 30.1.
  • the engagement of the centering lug 74 in the centering 33 and the projection 34 in the recess 75 a lateral guidance of the support member 70 is achieved, which has a positive effect on the rotation of the support member 70 and thus of the round shank chisel 60.
  • the centering surface 33.1 merges tangentially into the surface of the projection 34.
  • the surface of the projection 34 is rounded in the wear surface 31.
  • the centering counterface 74.1 of the centering projection 74 of the support element 70 extends tangentially into the recess 75 and the surface of the recess 75 rounded off into the seat surface 73 of the support element 70.
  • the rotation of the support member 70 and thus the round shank chisel 60 obstructing edges are avoided.
  • the projection 34 counteracts with its radially outer surface portion forces acting radially inwardly on the support member 70. Radially outward forces counteract the radially inner surface portion of the lug 34. This reduces the force which has to be absorbed by the centering surface 33.1 of the holding section 30, which leads in this area to a reduced surface pressure and correspondingly to a reduced wear.
  • the guide counteracts by the projection 34 of a wobbling movement in the disk plane of the support member 70, which causes a further reduction in wear on the bit holder 20.
  • FIG. 6 shows a schematic representation of the wear of the wear surface 31 of a known chisel holder 30 with an asymmetric load of complementary to the wear surface 31 and the centering 33 shaped support member 70.
  • the disk-shaped support member 70 is in the embodiment shown by a flat support surface 72 and an opposite, also just running seat 73 limited.
  • the centering shoulder 74 is integrally formed with its centering counterface 74.1 circumferentially to the central receiving bore 77 on the seat surface 73.
  • the receiving bore 77 an insertion phase 76.1. This facilitates the insertion of the chisel shaft.
  • the asymmetric load is represented by two arrows of different lengths, which symbolize a first force 83.1 and a comparatively larger second force 83.2.
  • the asymmetrical introduction of force can be caused for example by the position of the bit holder 20 to the direction of rotation of the milling drum.
  • Such a non-uniform axial load results in a larger lateral movement (radial movement 82) of the support member 70 to an asymmetrical wear on the wear surface 31 of the chisel holder 20. This is by a relative to a plane perpendicular to the central longitudinal axis M plane inclined by a wear angle 84 course of the wear surface 31 indicated.
  • the radial movement 82 is made possible with insufficient lateral guidance of the support element 70.
  • the support element 70 leading the round shank chisel 60 lies obliquely to the center longitudinal axis M on the wear surface 31.
  • the receiving bore 77 is not aligned exactly with the central longitudinal axis M of the bit holder 32.
  • the smooth rotation of the round shank chisel 60 can be hindered or prevented.
  • the uneven wear of the wear surface 31 leads to a strong length wear of the holding portion 30th
  • FIGS. 7 to 15 show in schematic lateral sectional views in each case a section of a holding portion 30 of the bit holder 20 in the region of the centering 33. Of the rotationally symmetrical holding portions 30 only one half to the central longitudinal axis M of the holding portion 30 is shown. The schematic representations are not to scale.
  • the projection 34 is rounded at its outer end in the wear surface 31 of the holding portion 30 transferred.
  • the projection 34 is formed bead-shaped. It is circumferential to the centering 33 arranged.
  • the projection 34 projects beyond the wear surface 31. In this case, the projection 34 forms a maximum point 37 at its highest point opposite the wear surface 31.
  • a centreline indicated by a double arrow 81 are present in the direction of the central longitudinal axis measured distance M between the end 36 of the centering 33 and the maximum point 37 of Approach 34 on.
  • the projection 34 has a first radius 86 in a range between 0.5 mm and 6 mm, in this case 1.5 mm.
  • the height of the projection 34 with respect to the wear surface 31 is preferably in a range between 0.3 mm and 2 mm, preferably between 0.5 mm and 1.5 mm, in this case at 1.0 mm.
  • the projection 34 passes over the rounded portion with a second radius 87 in the wear surface 31 on.
  • the transition from the projection 34 to the centering 33.1 of the centering 33 is continuous. Thus, edges between the centering 33.1, the shoulder 34 and the wear surface 31 are avoided, whereby the free rotation of a mounted support member 70 is improved about the central longitudinal axis M.
  • the projection 34 is formed in the manufacture of the chisel holder 20 to the holding portion 30. He engages with mounted tool system in the receptacle 75 of the support member 70, as shown in FIG. 5 is shown.
  • the inner diameter D i 85 of the bit receptacle 32 is marked by an arrow.
  • the centering height 81 is designed such that the ratio between the inner diameter D i 85 of the bit receptacle 32 and the centering height 81 is less than 8.
  • the centering height 81 is given by the axial dimensioning of the centering receiver 33 and the projection 34.
  • the centering height 81 is designed such that it is greater than the axial play 80 of the round shank chisel 60 and thus of the support element 70.
  • the dimensioning of the centering 81 depending on the inner diameter D i 85 of the bit holder 32 takes into account the larger allowable axial play 80th for larger tool systems.
  • the easy rotation of the support member 70 and the round shank chisel 60 is further obtained by the rounded or continuous and thus edge-free transitions between the centering surface 33.1, the neck 34 and the wear surface 31. Sharp transitions easily lead to the support member 70 tilted relative to the bit holder 20 and thereby rotation is prevented. This can be avoided by the rounded or continuous transitions.
  • a guide groove 35 is formed in the wear surface 31.
  • the guide groove 35 extends at a distance from the centering receptacle 33. It has a trapezoidal contour with inclined to the wear surface 31 extending side surfaces.
  • the projection 34 is formed between the centering 33 and the guide groove 35. He also has a trapezoidal contour. In the embodiment shown, the projection 34 in the same plane as the wear surface 31 laterally of the guide groove 35 from. Towards the central longitudinal axis M, the projection 34 passes directly into the inclined centering surface 33. 1 of the centering receiver 33.
  • the centering receptacle 33 is also here, as in all other embodiments described below, completed by the end 36 formed in the transition from the centering surface 33.1 to the lateral surface of the bit receptacle 32.
  • a guide web to the seat 73.
  • the guide web has a complementary to the guide groove 35 contour.
  • the centering height 81 is measured in the direction of the central longitudinal axis M between the end 36 of the Zentrierfact 33 and the upper surface of the projection 34, as shown by a double arrow.
  • the ratio between the inner diameter D i 85 of the bit holder 32 and the centering height 81 is less than 8, in the present case less than 6.5, selected. As a result, a good lateral guidance of the support element is achieved. At a ratio of less than 6.5 sufficient lateral guidance is also achieved towards the end of the service life of the support member 70 and the round shank chisel 60, if the axial play 80 of the round shank chisel 60 is optionally increased by the wear already occurred.
  • the transition from the centering surface 33.1 to the projection 34 and / or the transition from the projection 34 to the adjacent side surface of the guide groove 35 and / or the transition from the opposite side surface of the guide groove 35 to the adjacent wear surface 31 rounded his.
  • the transitions from the side surfaces to the groove bottom can be rounded. Sharp edges can be avoided. This leads to an improved rotatability of the support element 70.
  • chisel holder 20 is also a trapezoidal guide grooves 35 formed in the wear surface 31.
  • An integrally formed between the guide groove 35 and the centering 33 projection 34 has a bead-shaped contour.
  • the radius of the projection 34 is selected so that its surface merges tangentially into the centering surface 33.1 of the centering receptacle 33 and opposite into the adjacent side surface of the guide groove 35.
  • the centering height 81 corresponds to the distance measured in the direction of the central longitudinal axis M between the end 36 of the centering receptacle 33 and the maximum point 37 of the projection 34.
  • the immediately successive combination of the centering receptacle 33, the projection 34 and the guide groove 35 is in conjunction with a corresponding
  • shaped seat 73 of a support member 70 has achieved a good lateral guidance of the support member 70.
  • the wear surface 31 of in FIG. 10 holding portion 30 shown goes directly into the centering surface 33.1 of the centering 33 via.
  • a bead-shaped projection 34 is integrally formed thereon.
  • the centering height 81 is measured along the central longitudinal axis M between the end 36 of the centering receptacle 33 and the maximum point 37 of the projection 34.
  • the comparatively far outwardly arranged on the holding portion 30 approach 34 results in a particularly good stabilization of the rotational movement of a corresponding thereto formed, adjacent support member 70th
  • FIG. 11 is a holding lug 30 with a multi-stage running, not shown support member 70 facing surface shown.
  • the centering surface 33.1 merges into a contact surface 38 arranged transversely to the central longitudinal axis M, in particular perpendicular to the central longitudinal axis M.
  • the contact surface 38 is adjoined by a projection 34 projecting beyond the contact surface 38.
  • the surface of the bead-shaped projection 34 passes tangentially into the adjacent side surface of a trapezoidally shaped guide groove 35.
  • the wear surface 31 Surrounding the guide groove, the wear surface 31 is arranged.
  • the contact surface 38, the maximum point 37 of the projection 34, the groove bottom of the guide groove 35 and the wear surface 31 are arranged along the central longitudinal axis M at different levels.
  • concentrically arranged projections 34 are formed around the centering 33 to the holding portion 30. It forms a wave-shaped contour, the surface of which represents the wear surface 31.
  • the centering height 81 is measured between the end 36 of the Zentrierfact 33 and the maximum point 37 of the innermost approach 34. In adjacent approaches 34 different height, the centering height 81 is preferably determined to the maximum point 37 of the highest approach 34.
  • the radially effective surface is significantly increased by the side edges of the projections 34. As a result, lateral forces can be better absorbed.
  • the contact area between a support member 70 and the holding portion 30 of the chisel holder 20 is increased. This leads to a reduced wear of the bit holder 20 and to an improved rotation of the support member 70 and thus the round shank chisel 60th
  • FIG. 13 shows a section of a chisel holder 20 with a flat wear surface 31, to which two concentric to each other, bead-shaped projections 34 are formed. Even with this arrangement a good rotation, good lateral stabilization can be achieved.
  • the in FIG. 14 illustrated chisel holder 20 has a rectilinear, but inclined to the central longitudinal axis M aligned wear surface 31.
  • the maximum point 37 is formed in the rounded-off transition region of the centering surface 33.1 in the wear surface 31.
  • Both the centering 33.1 and the wear surface 31 act by their orientation obliquely to the central longitudinal axis M radially stabilizing to the position of a matched in the contour of its seat 73 to the wear surface 31 support member 70.
  • the centering 81 is in the direction of the central longitudinal axis M from the end 36 of Centering 33 measured at the maximum point 37 at the transition from the centering surface 33.1 to the wear surface 31.
  • both the centering surface 33.1 and the wear surface 31 aligned obliquely with respect to the central longitudinal axis M have a radially stabilizing effect on a correspondingly shaped, fitting supporting element 70.
  • the length wear of Holding section 30 can be significantly reduced with respect to the operating time of the tooling system.
  • a tilting of the round shank chisel 60 at startup can be almost avoided due to the improved and more stable engagement of the lugs or 34 in corresponding recesses 75 of a support member 70.
  • the length wear of the holding portion 30 is thereby made uniform.
  • the drill collar and the bit holder 32 are better protected from contamination by the increased sealing effect of the support surface between the support member 70 and the holding portion 30. This also leads to a significantly reduced wear of the chisel holder 20 in the region of its holding portion 30.
  • By forming the Abtrag vom 23, 24 for engagement with correspondingly shaped support surfaces 16.1, 16.2 of the base holder 10 premature wear or fatigue failure of the plug neck 40 of the chisel holder 20 can be avoided become.
  • the life expectancy of the chisel holder 20 as a structural unit can be significantly increased. This leads to reduced maintenance and spare parts costs.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Road Repair (AREA)
EP18197493.2A 2017-10-09 2018-09-28 Porte-burin Active EP3467255B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017123368.7A DE102017123368A1 (de) 2017-10-09 2017-10-09 Meißelhalter

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EP3467255A1 true EP3467255A1 (fr) 2019-04-10
EP3467255C0 EP3467255C0 (fr) 2023-12-20
EP3467255B1 EP3467255B1 (fr) 2023-12-20

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US (1) US20190106988A1 (fr)
EP (1) EP3467255B1 (fr)
CN (2) CN209384074U (fr)
DE (1) DE102017123368A1 (fr)
ES (1) ES2970564T3 (fr)
HU (1) HUE065516T2 (fr)
PL (1) PL3467255T3 (fr)

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Publication number Priority date Publication date Assignee Title
DE102017123368A1 (de) * 2017-10-09 2019-04-11 Wirtgen Gmbh Meißelhalter
CN110924284B (zh) * 2019-12-17 2024-12-24 江苏五元素机械制造有限公司 快换刀架的切割装置
CN110983927B (zh) * 2019-12-17 2024-12-31 江苏五元素机械制造有限公司 具有紧固部件的切割装置
CN111041959A (zh) * 2019-12-19 2020-04-21 苏州五元素机械制造有限公司 自定心刀架的切割装置
USD982633S1 (en) 2021-03-11 2023-04-04 Kennametal Inc. Washerless cutting tool assembly
US11585217B2 (en) 2021-03-11 2023-02-21 Kennametal Inc. Washerless cutting tool assembly
US12006825B2 (en) 2021-03-11 2024-06-11 Kennametal Inc. Cutting tool with shank portion configured for limiting rotation and controlling orientation of the tool
DE102021112757A1 (de) * 2021-05-17 2022-11-17 Bomag Gmbh WECHSELHALTER, MEIßELWECHSELHALTERSYSTEM, FRÄSWALZE FÜR EINE STRAßENFRÄSMASCHINE UND STRAßENFRÄSMASCHINE

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DE3144060A1 (de) * 1981-11-06 1983-05-19 Wolfgang 6603 Sulzbach Preinfalk Axialhalterung fuer schraemmeissel
EP1427913B1 (fr) 2001-09-10 2006-02-15 Kennametal Inc. Lavoir estampe
AT10912U1 (de) * 2008-09-26 2009-12-15 Schwamborn Geraetebau Gmbh Rundschaftmeissel für meisselfräsen sowie befestigung
DE102011051525A1 (de) * 2011-07-04 2013-01-10 Wirtgen Gmbh Meißelhalter für eine Bodenbearbeitungsmaschine
EP2639402A2 (fr) * 2009-10-19 2013-09-18 Betek GmbH & Co. KG Pic à tige ronde avec une douille de fixation
DE102014104040A1 (de) 2014-03-24 2015-09-24 Betek Gmbh & Co. Kg Meißel, insbesondere Rundschaftmeißel
WO2017194328A1 (fr) * 2016-05-12 2017-11-16 Betek Gmbh & Co. Kg Burin muni d'un élément d'appui à insert de centrage

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US7832808B2 (en) * 2007-10-30 2010-11-16 Hall David R Tool holder sleeve
HUE055782T2 (hu) * 2010-12-03 2021-12-28 Wirtgen Gmbh Késtartó
CN204530413U (zh) * 2015-04-09 2015-08-05 中联重科股份有限公司 铣刨刀具及具有其的铣刨机
DE102017123368A1 (de) * 2017-10-09 2019-04-11 Wirtgen Gmbh Meißelhalter

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DE3144060A1 (de) * 1981-11-06 1983-05-19 Wolfgang 6603 Sulzbach Preinfalk Axialhalterung fuer schraemmeissel
EP1427913B1 (fr) 2001-09-10 2006-02-15 Kennametal Inc. Lavoir estampe
AT10912U1 (de) * 2008-09-26 2009-12-15 Schwamborn Geraetebau Gmbh Rundschaftmeissel für meisselfräsen sowie befestigung
EP2639402A2 (fr) * 2009-10-19 2013-09-18 Betek GmbH & Co. KG Pic à tige ronde avec une douille de fixation
DE102011051525A1 (de) * 2011-07-04 2013-01-10 Wirtgen Gmbh Meißelhalter für eine Bodenbearbeitungsmaschine
DE102014104040A1 (de) 2014-03-24 2015-09-24 Betek Gmbh & Co. Kg Meißel, insbesondere Rundschaftmeißel
WO2017194328A1 (fr) * 2016-05-12 2017-11-16 Betek Gmbh & Co. Kg Burin muni d'un élément d'appui à insert de centrage

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HUE065516T2 (hu) 2024-05-28
CN109629383A (zh) 2019-04-16
DE102017123368A1 (de) 2019-04-11
PL3467255T3 (pl) 2024-05-06
ES2970564T3 (es) 2024-05-29
US20190106988A1 (en) 2019-04-11
EP3467255C0 (fr) 2023-12-20
EP3467255B1 (fr) 2023-12-20
CN209384074U (zh) 2019-09-13
CN109629383B (zh) 2021-11-23

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