EP4178761A1 - Tête de meulage pour l'usinage de pièces à usiner - Google Patents

Tête de meulage pour l'usinage de pièces à usiner

Info

Publication number
EP4178761A1
EP4178761A1 EP21740485.4A EP21740485A EP4178761A1 EP 4178761 A1 EP4178761 A1 EP 4178761A1 EP 21740485 A EP21740485 A EP 21740485A EP 4178761 A1 EP4178761 A1 EP 4178761A1
Authority
EP
European Patent Office
Prior art keywords
grinding
belt
grinding head
take
machining
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
EP21740485.4A
Other languages
German (de)
English (en)
Other versions
EP4178761C0 (fr
EP4178761B1 (fr
Inventor
Bruno Vogelsang
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.)
Verwo Ag
Original Assignee
Verwo Ag
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 Verwo Ag filed Critical Verwo Ag
Publication of EP4178761A1 publication Critical patent/EP4178761A1/fr
Application granted granted Critical
Publication of EP4178761C0 publication Critical patent/EP4178761C0/fr
Publication of EP4178761B1 publication Critical patent/EP4178761B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/004—Machines or devices using grinding or polishing belts; Accessories therefor using abrasive rolled strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor

Definitions

  • This invention relates to a grinding head for machining workpieces to create a grinding track therein along a predetermined track.
  • Such grinding marks are required to accommodate seals, for example in vacuum technology or vice versa, to seal off increased internal pressures from the outside.
  • Grinding heads are known to date and are only used on specially designed machines. They contain a prism, around the outer tip of which runs a sanding belt, which can be of the same nature as the usual sanding sheets or sandpaper.
  • the grinding belt usually has a textile backing with a granular structure applied to one side. Such an approximately 1 to 6 mm wide sanding belt then runs around the rounded tip of the prism on the sanding head.
  • a tape dispenser roll On one side of the prism is a tape dispenser roll, from which the tape is fed forward around the rounded tip of the prism and then on the other side of the prism back to a take-up roll, on the same principle as a typewriter Ribbon is guided from a roll over the writing point to the other winding roll.
  • the grinding head is guided along a grinding path with this prism tip covered with grinding tape in order to produce a grinding track on the workpiece, which is carried out by the grinding machine in which the grinding head is clamped.
  • the grinding machine can move the grinding head back and forth in all directions and planes under program control and, depending on the grinding machine, also rotate it around one or even all axes.
  • the machine tool has a power connection, by means of which the clamped grinding head can be supplied with electrical energy. The electrical energy is required to drive an adjustment mechanism on the grinding head. If, after a certain grinding distance has been covered, the grinding belt is worn out at the grinding point, the grinding belt must be readjusted on the prism.
  • the grinding belt is adjusted by means of an electric motor, for example by means of a stepping motor, inside the grinding head by at least one grinding point, by winding and pulling the grinding belt over the grinding point, i.e. over the rounded tip on the prism and unrolling the grinding belt by one such a small distance of the sanding point from the sanding belt roll.
  • This process is repeated dozens of times until the roll of abrasive tape is completely used up.
  • This grinding machine is a so-called stand-alone machine, which is only used for this specific processing, namely grinding a grinding track on the workpiece.
  • a workpiece is now machined using a machine tool, such as a CNC milling machine or on a CNC lathe, and grinding work then occurs as the work progresses, for example if a grinding track is to be ground on a sealing surface, so the workpiece must be unclamped from the CNC milling machine or lathe and then clamped in the grinding machine.
  • a machine tool such as a CNC milling machine or on a CNC lathe
  • grinding work then occurs as the work progresses, for example if a grinding track is to be ground on a sealing surface, so the workpiece must be unclamped from the CNC milling machine or lathe and then clamped in the grinding machine.
  • During the time window that is required for the grinding work it is usually not worth loading the milling machine or the lathe with other workpieces and even starting new work on these machines.
  • the interruptions in time caused by grinding on the stand-alone grinding machine are too short.
  • the usually expensive milling machine or lathe remains unused and underutilized for a while
  • the object of this invention is therefore to provide a grinding head that The work steps associated with the grinding work are reduced to a minimum, with significant savings in effort and costs. Furthermore, it is an object of the invention to specify a grinding head by means of which potential sources of error in the preparation of the workpiece can be minimized. It would be advantageous to have a sanding head that could do exactly the same sanding work as a conventional sanding head, but which did not require electrical power and could therefore be used on a milling machine or on a lathe where electrical power is not available at the jig for the processing tool or is available at all on the machine. If the grinding work could be carried out directly on a machine tool such as a milling machine or a lathe, without unclamping the workpiece in the meantime, it would be much faster and sources of error would be eliminated.
  • FIG. 1 perspective view of the grinding head in a lying position
  • FIG. 2 shows the grinding head in a vertical position
  • FIG. 3 shows a longitudinal section through the grinding head along the line BB in FIG. 2
  • FIG. 4 shows a longitudinal section through the grinding head along the line AA in FIG. 2
  • FIG. 5 shows a view of the grinding head according to FIG. 2 from below
  • FIG. 6 shows a section along the line CC in FIG. 5
  • FIG. 7 shows a section along the line DD in FIG. 5;
  • FIG. 8 The guide prism for the sanding belt enlarged and shown in perspective
  • FIG. 9 A workpiece with a finish-ground grinding path in a plan view.
  • Figure 1 shows an example of a grinding head in perspective in a lying position. It has a carrier body 1 made of steel, to which an attachment 2 connects at the front, on which a triangular guide prism 3 is attached, around which the abrasive belt 4, for example 1 to 6 mm wide, runs along the two sides or flanks 17, 18 of the Guide prism 3 is performed.
  • the abrasive tape 4 is unwound from a dispenser roll 6, from there on the edge 17 of the prism 3 facing away from the viewer, forward to the tip 5 of the prism 3 and then over the edge 18 to a take-up roll 7.
  • This tip 5 of the prism 3 is light rounded, so that the abrasive belt 4 is guided around this tip and is then guided to the take-up roller 7.
  • This unwinding and winding takes place in the same way as with a typewriter ribbon.
  • the grinding head is guided by a milling machine in a plane along the workpiece to be machined, in a one-dimensional movement as indicated by the two directional arrows. These arrows lie in the plane of the prism 3.
  • the grinding head can also be clamped in a lathe, just like a cutting tool, and it is then the workpiece that is rotated along the grinding tip 5 or grinding point under the same, for example to produce a ground one circular slot.
  • the attachment 2 forms a rotationally symmetrical plate 12, which is spring-loaded on the axis of rotation spaced apart from the carrier body 1 is screwed to the same, while all other parts of the attachment 2 are arranged below the plate 12 within its outer radius.
  • the carrier body 1 is shaped into a coupling piece 28 , for clamping on a machine tool, such as a milling machine or on a lathe or lathe, in particular on a CNC Machine tool, such as a CNC milling machine or lathe.
  • FIG. 2 shows this grinding head according to FIG. 1 in a vertical position. At the top you can see the coupling piece 28 of the carrier body 1, and below the carrier body, with a slot 11 that is not visible here, the attachment 2 is held at a distance the same arranged the guide prism 3.
  • the abrasive belt 4 is also shown, as it runs from the donor roll 6 along the right flank 17 of the guide prism 3 around its lower rounded tip 5 and then along the left flank 18 in the picture to the take-up roll 7.
  • Two cutting lines AA and BB are also drawn in this figure.
  • FIG. 3 shows a longitudinal section through the grinding head along the line B-B in FIG. 2, this grinding head from FIG. 2 being shown rotated by 90° about the vertical axis.
  • the attachment 2 is placed on the bottom of the carrier body 1 and is held on the carrier body 1 at a distance from the carrier body 1 by means of pressure-loaded screws by a slot 11 . This means that the grinding tip 5 of the prism 3, together with the entire attachment 2, can give way a bit in relation to the carrier body 1 under pressure, so it has a corresponding spring travel.
  • a shaft 10 can be seen here, on which a gear wheel 8 with a freewheel is seated, so that it therefore only entrains the shaft 10 in one direction.
  • the guide prism 3 protrudes downwards and ends with its tip 5, around which the grinding belt 4 is guided.
  • One of the screws 21, with which the guide prism 3 is clamped to the attachment 2 can be seen in section.
  • FIG. 4 shows a longitudinal section through the grinding head along the line AA in Figure 2.
  • the gear 8 on the shaft 10 and behind it a rack 9, which extends here in the vertical direction. It is in engagement with the toothing of the gear 8 and can be moved up and down in the attachment 2 .
  • This rack 9 is spring-loaded on a piston 24, below which a compression spring 25 is installed. Whenever the compression spring 25 is compressed, this pushes the rack 9 from above downwards, causing the pinion 8 to move by a constant amount each time Angle of rotation rotates, in the direction that then causes the take-up roll 7 for the abrasive belt 4 to be wound up.
  • the toothed rack 9 is returned to its starting position by the compression spring 25 while rotating the freewheel of the gear wheel 8 .
  • a piece of abrasive tape 4 is unwound from the donor roll 6, the rotation of which is braked so that it does not turn too far when unwinding.
  • the exertion of pressure from above on the rack 9 is achieved here with a pneumatic pressure.
  • the milling machine or the lathe offer a pneumatic pressure source for this purpose. This pneumatic pressure can therefore be guided below the coupling piece 28 and via the channel 26 into a cylinder 27 in which the piston 24 with its mount for the toothed rack 9 is guided.
  • a relief bore with one-way valve leads out of this cylinder 27 .
  • hydraulic pressure can be used instead of pneumatic pressure.
  • the cooling lubricant used or supplied by the machine tool or the drilling milk can be used.
  • the hydraulic pressure then acts in exactly the same way and, if necessary, presses the piston 24 with the rack 9 downwards, which finally rotates the take-up roller 7 by a fixed angle of rotation, which causes the grinding belt 4 to be readjusted by at least one grinding point.
  • a bolt 14 with associated bushing 15 for the axial guidance of the attachment 2 on the carrier body 1 can also be seen on the attachment 2.
  • the attachment 2 is, however, screwed to the carrier body 1 with three screws 20, leaving a slot 11 free, and this slot 11 is (Not visible in Figure 4) compression springs 13 held open, within which compression springs 13 put the screws 20 not visible here, with which the attachment 2 is screwed to the carrier body 1. In FIG. 3 one can partially see one of the compression springs 13 which keep the selected slot 11 between the support body 1 and the attachment 2 open.
  • FIG. 5 shows a view of the grinding head according to FIG. 2 from below, in which figure the section lines CC and DD are located, and the corresponding sections are explained with reference to the following figures.
  • the guide prism 3 In the center of the attachment 2 and its rotationally symmetrical plate 12 is the guide prism 3 with a view of its lower Tip 5 and the two flanks 17, 18 leading to it visible.
  • Figure 6 shows a section along the line CC in Figure 5.
  • Figure 7 shows the section along the line D-D in Figure 5.
  • This section gives a view of the cylinder 27, in which the piston 24 with the socket for the rack 9 runs.
  • the rack 9 protrudes downwards from the piston 24 and the piston 24 sits on a compression spring 25, which always pushes it back up to its original position and thus pulls up the rack 9 when there is no pneumatic or hydraulic pressure acting on the piston 24 from above .
  • the gear wheel 8 rotates idly on the shaft 10 thanks to the freewheel. From the starting position, when the toothed rack 9 is at the upper end of its displacement path, the toothed rack 9 can be pushed down against the acting force of the compression spring 25 by applying pneumatic pressure or hydraulic pressure - without current, i.e. without the grinding head being dependent on an electrical power source be what causes the rotation of the gear 8 and the take-up roller 7 to an always constant angle of rotation.
  • the grinding head can therefore be clamped in a program-controlled machine tool, for example in a CNC machine—for example a CNC milling machine or lathe—can be guided along a programmed grinding path without current and under program control.
  • a program-controlled machine tool for example in a CNC machine—for example a CNC milling machine or lathe—can be guided along a programmed grinding path without current and under program control.
  • the grinding belt 4 can be readjusted without current by at least the distance of a grinding point.
  • it is unrolled from the dispenser roll 6 by the braked dispenser roll 6 by means of the pneumatic or hydraulic take-up roll 7 rotated by a constant angle, pulled over and wound up on the driven take-up roll 7 .
  • the grinding head is guided by the (CNC) machine tool under program control along a programmed grinding path.
  • the grinding head according to the invention can therefore perform exactly the same grinding work as a conventional grinding head, but does not require electrical energy and can therefore be used on a machine tool such as a milling machine or on a lathe, for example on CNC machines, where no electrical Energy is available on the clamping device for the processing tool or at all on the same. Since the grinding head according to the invention can be used to carry out the grinding work directly on a (CNC) machine tool without having to unclamp the workpiece from it in the meantime, significant work steps can be saved and the machine tool can be used continuously, which considerably speeds up the production process and increases its efficiency. Finally, sources of error can also be effectively minimized because the entire process of unclamping and clamping the workpiece again becomes obsolete. This saves effort and costs.
  • FIG. 9 shows an example of a grinding path 16 ground in this way on a sealing surface on a workpiece 22, shown here in a plan view.
  • This grinding path 16 or grinding path then typically serves to accommodate a steel or metal seal to be placed thereon.
  • the guide means 3 for guiding the grinding belt 4 is implemented as a prism.
  • the guide means can also be shaped differently, as long as it is used to guide or unwind a grinding belt 4 over the grinding surface 5 .
  • the transmission via which the pneumatic or hydraulic pressure movement of the piston 24 is translated to the rotary movement of the take-up roll 7, is realized in the present embodiment by means of a gear wheel 8 and a toothed rack 9 and a shaft 10 on which the gear wheel 8 is seated.
  • the transmission can also be designed differently, as long as it ensures a direct or indirect mechanical transmission of the movement of the piston 24 to the rotation of the take-up roller 7.
  • a dispenser roll 6 is used as a means for dispensing abrasive tape 4 and a take-up roll 7 is used for receiving worn abrasive tape 4 .
  • This can also be carried out using alternative means, as long as the supply of grinding belt 4 for the guide means 3 is ensured, the worn grinding belt 4 is then received by a means and the grinding belt 4 is readjusted in the process.
  • the latter means is operated without electricity by being fed by a pneumatic or hydraulic pressure source of the milling machine or lathe to which the grinding head is coupled and being driven via a mechanical transmission.
  • a separate supply channel in the form of a snake's neck can optionally be present on or next to the grinding head, for the supply of cooling lubricant or drilling fluid for cooling and lubricating the grinding point.
  • the invention relates to the use of the pneumatic or hydraulic pressure of a - for example CNC-controlled - machine tool such as a milling machine or lathe for currentless displacement, and thus readjusting the grinding belt 4 of a grinding head.
  • the means for adjusting the grinding belt 4 is fed by the compressed air or hydraulic sources or aggregates of the machine tool and is driven by mechanical transmission.
  • the cooling lubricant or drilling milk can be used as a hydraulic medium. number index

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

La présente invention porte sur une tête de meulage qui sert à l'usinage de pièces à usiner, afin de meuler des trajectoires de meulage dans celle-ci. Elle est constituée d'une partie de support (1) et d'une partie supérieure (2) avec des moyens de guidage (3) pour guider une bande de meulage (4) en amont et en aval de son point de meulage (5). À l'extérieur du prisme de guidage (3) sont disposés des moyens (6, 7) pour distribuer la bande de meulage (4) et la recevoir de l'autre côté des moyens de guidage (3). La particularité est que la bande de meulage (4) peut être réglée sans énergie électrique, au moyen d'une pression pneumatique ou hydraulique.
EP21740485.4A 2020-07-07 2021-07-05 Tête de meulage pour l'usinage de pièces à usiner Active EP4178761B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00838/20A CH716134B1 (de) 2020-07-07 2020-07-07 Schleifkopf für die maschinelle Bearbeitung von Werkstücken.
PCT/EP2021/068530 WO2022008455A1 (fr) 2020-07-07 2021-07-05 Tête de meulage pour l'usinage de pièces à usiner

Publications (3)

Publication Number Publication Date
EP4178761A1 true EP4178761A1 (fr) 2023-05-17
EP4178761C0 EP4178761C0 (fr) 2024-05-22
EP4178761B1 EP4178761B1 (fr) 2024-05-22

Family

ID=73136052

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21740485.4A Active EP4178761B1 (fr) 2020-07-07 2021-07-05 Tête de meulage pour l'usinage de pièces à usiner

Country Status (3)

Country Link
EP (1) EP4178761B1 (fr)
CH (1) CH716134B1 (fr)
WO (1) WO2022008455A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021104526B4 (de) * 2021-02-25 2022-09-08 APEX Automatisierungs- & Präzisionstechnik GmbH Werkzeug mit einem Schleifbandhalter
CN120134145B (zh) * 2025-05-16 2025-07-15 二重（德阳）重型装备有限公司 大型多棱边锥体滑动面的研配装置及研配方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2901871A (en) * 1957-02-07 1959-09-01 J M Nash Company Method and machine for finishing the inner surfaces of hollow workpieces
JPS59156507A (ja) * 1983-02-25 1984-09-05 Ishikawajima Harima Heavy Ind Co Ltd 圧延ロ−ルの研削装置
DE4320945C2 (de) * 1993-06-24 1996-05-23 Grieshaber Masch Bandschleifmaschine

Also Published As

Publication number Publication date
CH716134B1 (de) 2020-11-13
EP4178761C0 (fr) 2024-05-22
WO2022008455A1 (fr) 2022-01-13
EP4178761B1 (fr) 2024-05-22

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