WO2012143176A1 - Percuteur - Google Patents

Percuteur Download PDF

Info

Publication number
WO2012143176A1
WO2012143176A1 PCT/EP2012/054203 EP2012054203W WO2012143176A1 WO 2012143176 A1 WO2012143176 A1 WO 2012143176A1 EP 2012054203 W EP2012054203 W EP 2012054203W WO 2012143176 A1 WO2012143176 A1 WO 2012143176A1
Authority
WO
WIPO (PCT)
Prior art keywords
firing pin
area
tool contact
tool
contact area
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.)
Ceased
Application number
PCT/EP2012/054203
Other languages
German (de)
English (en)
Inventor
Otto Baumann
Hardy Schmid
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to EP12709567.7A priority Critical patent/EP2699391A1/fr
Priority to CN201280018743.0A priority patent/CN103476550A/zh
Publication of WO2012143176A1 publication Critical patent/WO2012143176A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0015—Anvils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/21—Metals
    • B25D2222/51—Hard metals, e.g. tungsten carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/065—Details regarding assembling of the tool

Definitions

  • firing pin for percussion devices, in particular a hammer, drill and / or chisel, with a body known.
  • the invention relates to a firing pin for a percussion device, in particular a hammer, drill and / or chisel hammer, with a base body.
  • the base body has at least two different hard areas.
  • a "firing pin” is to be understood as meaning, in particular, a component of a percussion device which is movably mounted and / or is provided for impulse transmission from a racket to a tool Part of the firing pin to be understood with a main extension in the direction of a direction of impact.
  • the firing pin preferably has an integrally formed on the base body supporting region, which advantageously in the radial
  • a "hardness" of a range is to be understood as meaning a mechanical resistance that a material opposes to the mechanical penetration of a harder specimen matched to different tasks matched the material properties of the firing pin.
  • the base body has at least one hard tool contact region and at least one viscous residual region.
  • a "tool contact area” is to be understood as meaning in particular a region of the base body which is provided for impulse transmission of a pulse of the firing pin, in particular on a tool inserted into a tool holder of the hammer, drill and / or chisel hammer. Area should be understood in this context, in particular an area with a high degree of hardness.
  • the hardness of at least the surface of the tool contact area should advantageously be increased relative to a hardness of at least one residual area of the main body.
  • a hard area can be achieved by a particularly high surface hardness.
  • a hard area is achieved by a particularly thick cured material layer.
  • the thickness of a cured material layer is compared to the thickness of a hardened
  • the tool contact region preferably has a hardness of 680-760 HV10 (Vickers).
  • a "tough" region is to be understood as meaning, in particular, a region which has great resistance to crack propagation and / or fracture
  • tempering in this context, heating is to be understood up to a temperature in which the toughness of a material increases
  • Microstructure change takes place.
  • at least one residual area during curing and / or coating of the tool contact area can be covered with a covering means, in particular by copper.
  • An undesired hardening and / or coating of the remaining area can be avoided by the covering means.
  • the hard tool contact area can provide beneficial momentum transfer from the firing pin to the tool or other body. to which the firing pin is to transmit a pulse. By compared to the remaining region of the body reduced elasticity of the hard tool contact area energy and / or momentum losses can be reduced.
  • the tough residual area can be particularly resistant to the formation of cracks and / or material fractures. A lifetime of
  • Striker can be increased advantageously.
  • the tool contact area has a deeply hardened surface.
  • a "deep-hardened surface” should be understood as meaning, in particular, that a hardened material layer has a depth perpendicular to the surface of at least 1 millimeter.
  • suitable hardening methods are known to the person skilled in the art:
  • the tool contact region can be case hardened
  • a particularly thick, hard layer can be achieved.
  • a hardening temperature can be generated in a particularly targeted manner in the tool contact area of the base body, a particularly wear-resistant surface can be produced, and a particularly effective impulse transmission of the firing pin can be achieved.
  • the tool contact area is covered by a hard layer.
  • a "hard layer” is to be understood as meaning, in particular, a hard material layer which is applied permanently to the tool contact region and / or which is produced in the tool contact region by introducing a further element
  • hard coating may be formed by incorporating carbon, boron and / or nitrogen into a base material of the firing pin
  • at least the tool contact region is case hardened, borated and / or nitrided to produce the hard layer
  • the tool contact region may preferably have a deeply hardened surface that is covered by another hard layer, which may be particularly hard and wear-resistant Tool contact area can be achieved with a particularly advantageous momentum transfer.
  • the remaining area has a tough core area with a surface hardening.
  • surface hardening is to be understood as meaning, in particular, a thin, hard layer.
  • the hard layer may be thinner than the deep-hardened surface of the tool contact region
  • Surface hardening like the deep-roughened surface, can be achieved by a hardening process, with surface hardening preferably taking place perpendicularly to the surface of the firing pin, with surface hardening preferably being achieved by mechanical hardening, such as Rolling and / or rolling can be produced
  • wear of the firing pin can be reduced.
  • the tough core region can effectively prevent breakage of the firing pin and / or cracking nn a surface quality can be further improved.
  • a breaking strength can be further improved. Wear on surface sealing rings can be reduced.
  • the firing pin is integrally formed.
  • in one piece should be understood in particular to be at least materially bonded, for example by a welding process, a bonding process, an injection molding process and / or another process that appears expedient to a person skilled in the art, and / or advantageously shaped in one piece, for example by a production from a casting and / or by a production in a single or multiple component spraying process and advantageously from a single blank .
  • the firing pin can be produced from a blank from a single, in particular curable base material Fastening points can be avoided and the firing pin can be particularly durable.
  • a hand-held power tool in particular a hammer, drill and / or chisel, with a percussion mechanism, a erfindungsge- according to the firing pin. It can be achieved a particularly effective, wear-resistant and durable hand tool.
  • the striker may be made in one or more process steps from a tough, hardenable material, such as a steel, in particular from a tempering steel.
  • a tough, hardenable material such as a steel, in particular from a tempering steel.
  • at least the remaining area can be surface-hardened.
  • the tool contact region can be deeply hardened in a further method step.
  • the tool contact region can be hardened by case hardening.
  • the tool contact region can be heated inductively to a hardening temperature.
  • the residual area can be softened softer than the tool contact area.
  • a "softer" quenching is to be understood as meaning that a temperature reduction takes place more slowly after a hardening temperature has been reached.
  • a further method known to those skilled in the art for producing a deep-hardened surface is conceivable be manufactured particularly inexpensive and reliable.
  • the residual area is protected by a covering means during a surface treatment of the tool contact area.
  • a "surface treatment” should be understood to mean hardening and / or coating of the surface of the tool contact area, in particular, the remaining area can be covered with copper, the remaining area can be effectively excluded from the surface treatment
  • a masking agent can also prevent coating of the residual area with a hard layer of the tool contact area
  • a hardness of the remaining portion is reduced by a tempering method.
  • the remaining region can be annealed inductively.
  • the residual region can be tempered at a higher temperature than the tool contact region.
  • the toughness of the residual area can be further improved. Cracking and / or breakage of the firing pin in the remaining area can be prevented particularly effectively.
  • FIG. 1 is a schematic representation of a hammer drill with a percussion device
  • FIG. 2 is a sectional view of a section of the hammer mechanism of a hammer drill
  • FIG. 3 shows a sectional drawing of a firing pin according to the invention
  • FIG. 4 shows process steps of a method for producing a firing pin according to the invention
  • Fig. 6 is a sectional view of a firing pin according to the invention in a second embodiment.
  • Figure 1 shows a schematic representation of a trained as a hammer drill 12a hand tool with a percussion device 10a with a firing pin 36a according to the invention.
  • the percussion device 10a is provided for generating a striking drive of a tool 30a in a direction of impact 50a.
  • the percussion device 10a contains the Schlagbol- zen 36a ( Figure 2) with a main body 14a, wherein the base body 14a has two different hard areas.
  • the main body 14a of the firing pin 36a has a hard tool contact area 16a and a tough residual area 18a (FIG. 3).
  • the tool contact region 16a is arranged at an end 38a of the main body 14a of the firing pin 36a, which
  • the tool contact region 16a has a deep-hardened surface 20a.
  • the tool contact region 16a is case hardened.
  • a depth of the hard layer 22a is at least as great as a radius 32a of the base body 14a in the tool contact region 16a about the direction of impact 50a, so that the base body 14a in FIG
  • Tool contact area 16a is completely through hardened.
  • the remaining area 18a has a tough core area 24a with a surface hardening 26a.
  • the firing pin 36a is integral with the base 14a and a support portion 34a. With the support portion 34a, the firing pin 36a is supported in an impact position of the firing pin 36a in the axial direction on the
  • the support region 34a has a hardness and a surface corresponding to the remaining region 18a.
  • a residual area 18a is protected by a covering means 28a, for example a copper paste, during a surface treatment of a tool contact area 16a.
  • the covering means 28a is applied in a first method step 40a.
  • the firing pin 36a is case hardened. Due to the covering means 28a, no carbon can penetrate into the remaining region 18a during case hardening.
  • this method step 42a another hardening process that appears appropriate to the person skilled in the art can also be used.
  • the covering means 28a is removed from the firing pin 36a.
  • the remaining area 18a may additionally receive a surface hardening 26a.
  • the surface hardening 26a is produced prior to the surface treatment of the
  • Tool contact portion 16a at least the remaining portion 18a of the firing pin 36a is rolled.
  • the hardness of the remaining portion 18a is reduced by a tempering method.
  • a tempering method In one
  • the firing pin 36a is hardened.
  • the deep-hardened surface 20a is formed.
  • the residual region 18a is inductively heated up to a tempering temperature, so that its hardness is reduced again.
  • an induction coil 52 is moved over the remaining area 18a, so that it heats up.
  • the tool contact area 16a is excluded from inductive heating, so that its temperature remains below the tempering temperature.
  • the tool contact region 16a does not change its microstructure and the deep-hardened surface 20a is retained.
  • the remaining area 18a may additionally receive a surface hardening 26a.
  • the entire firing pin 36a or parts of the firing pin 36a can be coated with a wear-resistant layer, for example, the firing pin 36a can be completely or partially bored and / or nitrided.
  • FIG. 6 shows a firing pin 36b with a main body 14b, wherein the main body 14b has two regions of different hardness.
  • the main body 14b has two regions of different hardness.
  • the 14b of the firing pin 36b has a hard tool contact area 16b and a tough residual area 18b.
  • the tool contact region 16b has a deep-hardened surface 20b.
  • the tool contact area 16b is additionally covered by a hard layer 22b.
  • the hard layer 22b is created by boring the base body and permanently connected to the firing pin 36b.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

L'invention porte sur un percuteur pour un dispositif à percussion (10), en particulier pour un marteau piqueur, une perceuse à percussion et/ou un marteau burineur (12), comprenant un corps de base (14). Selon l'invention, le corps de base (14) présente au moins deux régions possédant des duretés différentes.
PCT/EP2012/054203 2011-04-19 2012-03-12 Percuteur Ceased WO2012143176A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12709567.7A EP2699391A1 (fr) 2011-04-19 2012-03-12 Percuteur
CN201280018743.0A CN103476550A (zh) 2011-04-19 2012-03-12 撞击销

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011007699.9 2011-04-19
DE201110007699 DE102011007699A1 (de) 2011-04-19 2011-04-19 Schlagbolzen

Publications (1)

Publication Number Publication Date
WO2012143176A1 true WO2012143176A1 (fr) 2012-10-26

Family

ID=45855736

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/054203 Ceased WO2012143176A1 (fr) 2011-04-19 2012-03-12 Percuteur

Country Status (4)

Country Link
EP (1) EP2699391A1 (fr)
CN (1) CN103476550A (fr)
DE (1) DE102011007699A1 (fr)
WO (1) WO2012143176A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10646498B2 (en) * 2015-05-26 2020-05-12 Aat Costech Co., Ltd. Composition for preventing, alleviating or treating muscle diseases or improving muscular function
EP4232242A4 (fr) * 2020-11-04 2024-07-03 Jacobs Chuck Manufacturing (Suzhou) Company, Ltd. Enclume de visseuse à choc
DE102024110360A1 (de) 2023-04-14 2024-10-17 Milwaukee Electric Tool Corporation Schlagwerkzeugamboss und Verfahren zum Herstellen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT112085B (de) * 1926-11-23 1929-01-25 Witkowitzer Bergb Gewerkschaft An der Oberfläche gehärteter Schlagkolben für Schlagwerkzeuge.
DE727551C (de) * 1940-08-06 1942-11-05 Krupp Ag Doepper
DE3808285A1 (de) * 1988-03-12 1989-09-21 Messer Griesheim Gmbh Verfahren zur herstellung harter und verschleissfester oberflaechenschichten
EP0731248A1 (fr) * 1995-03-10 1996-09-11 Tracto-Technik Paul Schmidt Spezialmaschinen Kg Instrument de percussion
JPH10169358A (ja) * 1996-12-16 1998-06-23 Yamamoto Lock Mach Kk さく岩機
GB2334053A (en) * 1998-02-07 1999-08-11 Tracto Technik Percussion boring machine with hard contacting surfaces

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT112085B (de) * 1926-11-23 1929-01-25 Witkowitzer Bergb Gewerkschaft An der Oberfläche gehärteter Schlagkolben für Schlagwerkzeuge.
DE727551C (de) * 1940-08-06 1942-11-05 Krupp Ag Doepper
DE3808285A1 (de) * 1988-03-12 1989-09-21 Messer Griesheim Gmbh Verfahren zur herstellung harter und verschleissfester oberflaechenschichten
EP0731248A1 (fr) * 1995-03-10 1996-09-11 Tracto-Technik Paul Schmidt Spezialmaschinen Kg Instrument de percussion
JPH10169358A (ja) * 1996-12-16 1998-06-23 Yamamoto Lock Mach Kk さく岩機
GB2334053A (en) * 1998-02-07 1999-08-11 Tracto Technik Percussion boring machine with hard contacting surfaces

Also Published As

Publication number Publication date
CN103476550A (zh) 2013-12-25
DE102011007699A1 (de) 2012-10-25
EP2699391A1 (fr) 2014-02-26

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