EP0413917A1 - Rotierendes konisches Schneidwerkzeug mit aufgesetzt gelagerter Verschleissplatte - Google Patents

Rotierendes konisches Schneidwerkzeug mit aufgesetzt gelagerter Verschleissplatte Download PDF

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Publication number
EP0413917A1
EP0413917A1 EP90111759A EP90111759A EP0413917A1 EP 0413917 A1 EP0413917 A1 EP 0413917A1 EP 90111759 A EP90111759 A EP 90111759A EP 90111759 A EP90111759 A EP 90111759A EP 0413917 A1 EP0413917 A1 EP 0413917A1
Authority
EP
European Patent Office
Prior art keywords
bit
shaft
clamping sleeve
bore
accordance
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.)
Withdrawn
Application number
EP90111759A
Other languages
English (en)
French (fr)
Inventor
Stephen P. Stiffler
Wayne H. Beach
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.)
Kennametal Inc
Original Assignee
Kennametal Inc
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 Kennametal Inc filed Critical Kennametal Inc
Publication of EP0413917A1 publication Critical patent/EP0413917A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material

Definitions

  • This invention relates to a wear shield for use in combination with a cutting tool assembly having a round shaft bit with a bit head and a bit shaft, in which the bit shaft has a circumferantial groove with a longitudinally slotted clamping sleeve positioned therein, and in which the bit shaft can be axially fixed in a bore of a bit holder with the clamping sleeve placed under tension while the bit shaft remains freely rotatable in the clamping sleeve. More particularly, the invention provides a wear shield which functions as a holding element during the insertion of the cutting tool assembly into a cutter bit block and which cooperates with the rearward portion of the bit head so as to facilitate the free rotation of the bit shaft within the bit block.
  • a round shaft bit is known from the U. S. Patent No. 1,475,136.
  • the clamping sleeve extends over the most significant portion of the axial dimension of the bit shaft, in order to obtain the greatest possible support and clamping surface for the clamping sleeve in the bore of the bit holder.
  • Such types of long clamping sleeves additionally bring the advantage that a sufficiently great holding force is produced between the clamping sleeve and the bore of the bit holder.
  • the clamping sleeve In the round shaft bit provided with the wear shield, the clamping sleeve is held tightly enough that the bit shaft with the clamping sleeve can be pushed into the bore of the bit holder even manually over a great portion of its axial dimension, until, for example, the wear shield abuts on the insertion side or face of the bit holder.
  • the wear shield is slid from the clamping sleeve, and reaches an area of the bit shaft free from the clamping sleeve, so that the clamping sleeve, with the clamping force particular to it, can be tensed in the bore of the bit holder.
  • the wear shield is constructed as a holding ring or holding disk, which encloses the clamping sleeve
  • the internal diameter of the holding ring or the holding disk is equal to or smaller than the diameter of the bore of the bit holder.
  • the internal diameter of the wear shield defines at least in part a beveled surface which cooperates with the rearward, beveled portion of the bit head so as to define a seat into which the rearward, beveled portion of the bit head is seated.
  • the wear shield has an external diameter which preferably is equal to or greater than the maximum external diameter of the bit head so that the portion of the wear shield projecting over the bit head serves to protect at least a portion of the bit holder.
  • the bit head is formed running into a collar adjacent to the bit shaft; that a hard metal insert is inserted into the bit point turned away from the bit shaft; and that the clamping sleeve extends essentially over a major portion of the axial length of the bit shaft.
  • a cutting tool generally indicated by the reference character 10, has the overall appearance of an elongated cylinder with circular transverse cross-sections of various diameters disposed along the axis of the cylinder.
  • the cutting tool 10 includes a bit shaft 12 which projects from bit head 14.
  • the bit head 14 includes a conically tapered section 16 which is capped at the upper end by a conically shaped carbide cutting tip 18 which is inserted into the bit tip in the known manner.
  • the transition of the bit head is thus constructed as collar 20, which forms the greatest external diameter of bit head 14.
  • the collar 20 comprises a forward flange portion 22, a central portion 24 and a rearward flange portion 26.
  • the forward portion 22 has a rearwardly and outwardly tapered surface which terminates in a uniform diameter as at 28 which extends a relatively short axial distance back from the tapered surface.
  • the lower edge of the uniform diameter section 28 terminates in a transversely disposed first annular wall 30 joined at its lower circumferential base to the bit shaft.
  • the rearward portion 26 is spaced axially and rearwardly from the annular wall 30 of the forward flange portion 22.
  • the rearward flange portion 26 has a shoulder or surface 32 which tappers inwardly and rearwardly from an initial uniform diameter annular wall 34 which originates in a transversely disposed second annular wall 36.
  • the reward flange portion terminates in generally constant diameter portion 38.
  • Disposed between the first and second annular walls is an annular groove. This groove or central portion 24 provides a means for engaging the cutting tool with a known cutting tool removal wrench.
  • a longitudinally split, cylindrical sleeve spring or clamping sleeve 50 rests in a reduced diameter portion 40 of the bit shaft 12. It is to be appreciated that various combinations of bit shaft length and clamping sleeve length are possible. Depending on the specific cutting tool design, a bit which has a long shaft can be used in combination with a clamping sleeve which is nearly as long as the shaft or a clamping sleeve that is much shorter than the shaft bit length. For illustrative purposes only, the clamping sleeve 50 extends over the greatest portion of the axial dimension of bit shaft 12 in a reduced diameter portion of corresponding length. The clamping sleeve 50 is seated in a reduced diameter portion 40 of the bit shaft as defined between the collar 42 on the free end of bit shaft 12 and the transversely disposed third annular wall 38 of the reward portion 26.
  • a wear shield 60 comprises an annular body 62 defining therein a hole 64 concentric with the outer circumference 66 of the annular body 62.
  • the hole 64 is chamfered, as at 70, at an angle of approximately 45 degrees relative to the body axis indicated at 68.
  • the application of the cutting tool and the overall dimensions thereof will dictate to some extent the actual dimensions of the wear shield.
  • the annular body 62 can be fabricated from a hardened Grade 8 washer.
  • This washer has a predetermined thickness of about 0.14 inches and an outside diameter of approximately 1.63 inches.
  • the diameter of the hole 64 proximate the rearwardly facing side of the annular body is approximately 0.775 inches and the forward facing side of the annular body is approximately;y 1.00 inches.
  • the chamfer 70 provides a seating surface which cooperates with the rearward flange portion 26 surface 32 when the cutting tool is assembled into the bit block as shown in Figure 2.
  • a constant diameter portion 76 is parallel with the wear shield axis 68 and cooperates with the reward flange portion's constant diameter portion 38. This arrangement facilitates the free rotation of the cutting tool mounted in the bit block bore as well as rotation of the wear shield relative to both the bit block and the cutting tool.
  • the mated chamfers of the wear shield and the cutting tool serve to minimize the penetration of work materials into the bit block, between the clamping sleeve, the tool shaft and/or the bit block bore.
  • the wear shield 60 is slid onto clamping sleeve 50 and functions during the assembly process as a clamping sleeve holding element.
  • the wear shield 60 forces the clamping sleeve 50 to such an extent that its external diameter is equal to or smaller than the diameter of bore 80 in bit holder 82.
  • the longitudinal slot of the clamping sleeve 50 is wide enough so that clamping sleeve 50 can be pressed together far enough that its internal wall lies on the base of circumferential groove 40 in bit shaft 12. Since bore 80 of bit block 82 is provided with a bevelled entrance 84 the bit shaft collar 42 of round shaft bit 10 can be easily inserted into bore 21.
  • This insertion process can be carried out manually with for example the increased application of force, for example, by means of a blow from a hammer.
  • the wear shield ceases to function as a holding element for the clamping sleeve.
  • the wear shield now is disposed on the free area of the bit shaft 12 between clamping sleeve 50 and the bit head 14, so that it releases clamping sleeve 50.
  • Clamping sleeve 50 can now be tensed with the tensing force specific to it, in the bore 80 of bit block 82, since it would accommodate, in the unstressed condition, an external diameter which is greater than the diameter of bore 80 of bit block 82. The difference between both diameter values determines the tensing force of clamping sleeve 50, and thereby the force with which the cutting tool 10 is held in bore 80 of bit block 82.
  • the external diameter of the wear shield corresponds to the maximum external diameter of bit head 14 in the area of collar.
  • the wear shield thereby serves as a protective disk for bit block 82, since it cushions the impact forces acting or cutting tool 10.
  • the wear shield is expanded over the maximum external diameter of the bit head, then the entire frontal side of the bit block 82 is protected against wear, if the wear shield is made of wear-resistant material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
EP90111759A 1989-08-23 1990-06-21 Rotierendes konisches Schneidwerkzeug mit aufgesetzt gelagerter Verschleissplatte Withdrawn EP0413917A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39755889A 1989-08-23 1989-08-23
US397558 1989-08-23

Publications (1)

Publication Number Publication Date
EP0413917A1 true EP0413917A1 (de) 1991-02-27

Family

ID=23571677

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90111759A Withdrawn EP0413917A1 (de) 1989-08-23 1990-06-21 Rotierendes konisches Schneidwerkzeug mit aufgesetzt gelagerter Verschleissplatte

Country Status (1)

Country Link
EP (1) EP0413917A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000043596A2 (de) 1999-01-25 2000-07-27 Betek Bergbau- Und Hartmetall-Technik Karl-Heinz Simon Gmbh & Co. Kg Werkzeug mit verschleissschutzelement für eine strassenfräs-, schrämm-, bergbaumaschine oder dgl
US6364420B1 (en) * 1999-03-22 2002-04-02 The Sollami Company Bit and bit holder/block having a predetermined area of failure
WO2003023189A1 (en) * 2001-09-10 2003-03-20 Kennametal Inc. Embossed washer
EP1945908A2 (de) * 2005-10-26 2008-07-23 Kennametal, Inc. Drehbares schneidwerkeug mit umgekehrter konizität
WO2009142577A1 (en) * 2008-05-20 2009-11-26 Sandvik Intellectual Property Ab Carbide block and sleeve wear surface
US20230264388A1 (en) * 2022-02-21 2023-08-24 Kennametal Inc. Washers for Rotatable Cutting Tools
USD1015136S1 (en) 2022-02-21 2024-02-20 Kennametal Inc. Washer for cutting tools
CN117803389A (zh) * 2024-01-15 2024-04-02 欧特威(江苏)机械科技有限公司 一种掘进截齿及其加工装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1494106A (en) * 1973-12-13 1977-12-07 Reinholdt As H Tool holder especially for hammer drills
DE3233123A1 (de) * 1982-09-07 1984-03-15 Wolfgang 6603 Sulzbach Preinfalk Axialhalterung fuer schraemmeissel
US4542942A (en) * 1982-07-06 1985-09-24 Voest-Alpine Aktiengesellschaft Bit holder equipped with a spraying device
US4561698A (en) * 1984-06-21 1985-12-31 Beebe Donald E Wear protector for tooth brackets on roadway surface cutting machines
US4818027A (en) * 1987-01-23 1989-04-04 Betek Bergbau-Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Round shaft bit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1494106A (en) * 1973-12-13 1977-12-07 Reinholdt As H Tool holder especially for hammer drills
US4542942A (en) * 1982-07-06 1985-09-24 Voest-Alpine Aktiengesellschaft Bit holder equipped with a spraying device
DE3233123A1 (de) * 1982-09-07 1984-03-15 Wolfgang 6603 Sulzbach Preinfalk Axialhalterung fuer schraemmeissel
US4561698A (en) * 1984-06-21 1985-12-31 Beebe Donald E Wear protector for tooth brackets on roadway surface cutting machines
US4818027A (en) * 1987-01-23 1989-04-04 Betek Bergbau-Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Round shaft bit

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6619757B1 (en) 1999-01-25 2003-09-16 Betek Bergbau- Und Hartmettall-Technik Karl-Heinz Simon Gmbh & Co. Kg Tool for a street milling, coal-cutting or mining machine
WO2000043596A2 (de) 1999-01-25 2000-07-27 Betek Bergbau- Und Hartmetall-Technik Karl-Heinz Simon Gmbh & Co. Kg Werkzeug mit verschleissschutzelement für eine strassenfräs-, schrämm-, bergbaumaschine oder dgl
US6364420B1 (en) * 1999-03-22 2002-04-02 The Sollami Company Bit and bit holder/block having a predetermined area of failure
WO2003023189A1 (en) * 2001-09-10 2003-03-20 Kennametal Inc. Embossed washer
US6824225B2 (en) 2001-09-10 2004-11-30 Kennametal Inc. Embossed washer
AU2006306623B2 (en) * 2005-10-26 2012-02-23 Kennametal Inc. Rotatable cutting tool with reverse tapered body
EP1945908A2 (de) * 2005-10-26 2008-07-23 Kennametal, Inc. Drehbares schneidwerkeug mit umgekehrter konizität
EP1945908A4 (de) * 2005-10-26 2011-08-31 Kennametal Inc Drehbares schneidwerkeug mit umgekehrter konizität
WO2009142577A1 (en) * 2008-05-20 2009-11-26 Sandvik Intellectual Property Ab Carbide block and sleeve wear surface
US8657385B2 (en) 2008-05-20 2014-02-25 Sandvik Intellectual Property Ab Carbide block and sleeve wear surface
US20230264388A1 (en) * 2022-02-21 2023-08-24 Kennametal Inc. Washers for Rotatable Cutting Tools
USD1015136S1 (en) 2022-02-21 2024-02-20 Kennametal Inc. Washer for cutting tools
CN117803389A (zh) * 2024-01-15 2024-04-02 欧特威(江苏)机械科技有限公司 一种掘进截齿及其加工装置

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