US20010006013A1 - Procedure for fastening a carbide tooth at a saw blade - Google Patents
Procedure for fastening a carbide tooth at a saw blade Download PDFInfo
- Publication number
- US20010006013A1 US20010006013A1 US09/745,680 US74568000A US2001006013A1 US 20010006013 A1 US20010006013 A1 US 20010006013A1 US 74568000 A US74568000 A US 74568000A US 2001006013 A1 US2001006013 A1 US 2001006013A1
- Authority
- US
- United States
- Prior art keywords
- saw blade
- carbide
- tooth
- welding
- carbide tooth
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D65/00—Making tools for sawing machines or sawing devices for use in cutting any kind of material
Definitions
- the invention relates to a procedure for fastening a carbide tooth at a saw blade, with the carbide tooth fabricated according to the saw tooth geometry being held butt-jointed to the prepared front-side abutting surface of the saw blade and then being attached to the saw blade under addition of heat along the joint between the saw blade and the carbide tooth.
- the invention has therefore the objective to provide a procedure for fastening a carbide tooth at a saw blade in the above mentioned kind, to establish a sufficiently fast connection between the saw blade and the carbide tooth, that is with the carbide tooth being positioned sufficiently accurate to permit the use of carbide teeth fabricated according to the saw tooth geometry, thus making complicated finishing unnecessary.
- the objective of the invention is achieved in that the carbide tooth is welded to the saw blade by means of a focal spot of a laser beam extending over the whole joint length.
- the carbide tooth need not be pressed against the related abutting surface of the saw blade during welding, so that the carbide tooth can be fabricated according to the saw tooth geometry before welding and can be exactly attached to the saw blade in a defined position.
- the welding process is performed simply, as, due to the specific shape of the focal spot of the laser beam, the carbide tooth is welded to the saw blade at the same over the whole joint length, which leads to a largely regular heat load of the carbide tooth and the saw blade with the effect that a sufficiently fast connection between the carbide tooth and the saw blade at a very low risk of fissures is established, that is at a comparatively low welding expenditure, as the laser beam does not require any displacement toward the joint between the carbide tooth and the saw blade.
- conditions are achieved that can be compared to those of spot welding, with the welding area, however, not being restricted locally to a section of the joint, but extending over the whole joint length.
- the desired shape of the focal spot which is essentially lenticular, can, at a given cross section of the laser beam, be ensured without difficulties via an appropriate optical system.
- the saw blade and the carbide tooth in another embodiment of the invention, can be preheated prior to welding in the area of the joint by means of the laser beam proper at a reduced output, so that the risk of fissures is further reduced.
- FIG. 1 shows a facility to accomplish the procedure in a schematic side view
- FIG. 2 depicts a saw with partly welded-on carbide teeth in a schematic horizontal projection.
- the saw blade 2 to be equipped with carbide teeth 1 which saw blade 2 may be either a single blade, an endless blade or a disk, depending on whether a mill saw blade, an endless saw blade or a circular saw blade shall be fabricated, is provided with prepared abutting surfaces 3 for welding on of the carbide teeth 1 that already show the tooth geometry required later. To be able to exactly align the individual carbide teeth 1 relative to the abutting surfaces 3 of the saw blade 2 for the welding procedure, the saw blade 2 is clamped, acc. to FIG.
- This essentially lenticular focal spot 9 extends over the whole length of the joint 10 established between a carbide tooth I and the abutting surface 3 , so that, under conditions comparable to spot welding, the welded joint is created at the same time over the whole joint length.
- the heat load is consequently largely regular over the joint length, the risk of fissures due to thermal stress is reduced and a way of fastening of the carbide teeth at the saw blade 2 is ensured that meets all requirements, even if the saw blade 2 is very thin to keep cutting gaps small.
- the welding area resulting from the selected shape of the focal spot between the carbide teeth 1 and the saw blade 2 is schematically indicated in FIG. 2 by crosshatches 11 .
- the focal spot 9 extending over the whole welding area 11 provides the favorable possibility to apply an additional heat treatment at reduced output via the laser beam 7 .
- the welding area 11 can be reannealed after welding to reduce existing thermal stress. Therefore, only the output of the laser welding device 6 needs to be controlled accordingly to preheat the later welding area 11 prior to welding and then to perform welding at full laser output, before a secondary thermal treatment is applied, again at reduced output.
Abstract
The description relates to a procedure for fastening a carbide tooth (1) at a saw blade (2), with a carbide tooth (1) fabricated according to the saw tooth geometry being held butt-jointed to the prepared front-side abutting surface (3) of the saw blade (2) and then being attached to the saw blade under addition of heat along the joint (10) between the saw blade (2) and the carbide tooth (1). To create favorable process conditions it is suggested that the carbide tooth (1) is welded to the saw blade (2) by means a focal spot (9) of a laser beam (7) extending over the whole joint length.
Description
- The invention relates to a procedure for fastening a carbide tooth at a saw blade, with the carbide tooth fabricated according to the saw tooth geometry being held butt-jointed to the prepared front-side abutting surface of the saw blade and then being attached to the saw blade under addition of heat along the joint between the saw blade and the carbide tooth.
- To be able, for instance, when cutting wooden lamellas, to keep the wood losses due to machining as small as possible and thus to better exploit the wooden material, cutting gaps as thin as possible are desired, which demands accordingly thin saw blades. However, with such thin saw blades the advantages of resharpenable carbide teeth cannot be utilized, as by fastening carbide teeth at the saw blade via hard-soldering as usual the required strength for cutting in an inhomogeneous wooden material without teeth breaking off cannot be achieved. Although it is known to fix spherical or cylinder-shaped carbide blanks to the tooth tips of saw blades by means of resistance welding, these carbide blanks in fact require complicated finishing by grinding to obtain the desired tooth geometry. As the carbide blanks have to be pressed tightly against the abutting surfaces of the saw blades during resistance welding, an exact positioning of the carbide blanks relative to the saw tooth is impossible due to material melting open in the joint area, which, on the one hand, demands spherical or cylinder-shaped carbide blanks, and, on the other hand, excludes the use of carbide teeth that have already been fabricated according the later tooth geometry before being welded on. To be able to keep the grinding work for finishing the welded-on carbide blanks comparatively low, only the tips of the teeth are made of carbide, so that resharpening such saws with welded-on saw tooth tips made of carbide is hardly possible.
- The invention has therefore the objective to provide a procedure for fastening a carbide tooth at a saw blade in the above mentioned kind, to establish a sufficiently fast connection between the saw blade and the carbide tooth, that is with the carbide tooth being positioned sufficiently accurate to permit the use of carbide teeth fabricated according to the saw tooth geometry, thus making complicated finishing unnecessary.
- The objective of the invention is achieved in that the carbide tooth is welded to the saw blade by means of a focal spot of a laser beam extending over the whole joint length.
- By the application of a sufficiently powerful laser beam the carbide tooth need not be pressed against the related abutting surface of the saw blade during welding, so that the carbide tooth can be fabricated according to the saw tooth geometry before welding and can be exactly attached to the saw blade in a defined position. The welding process is performed simply, as, due to the specific shape of the focal spot of the laser beam, the carbide tooth is welded to the saw blade at the same over the whole joint length, which leads to a largely regular heat load of the carbide tooth and the saw blade with the effect that a sufficiently fast connection between the carbide tooth and the saw blade at a very low risk of fissures is established, that is at a comparatively low welding expenditure, as the laser beam does not require any displacement toward the joint between the carbide tooth and the saw blade. Thus, conditions are achieved that can be compared to those of spot welding, with the welding area, however, not being restricted locally to a section of the joint, but extending over the whole joint length. The desired shape of the focal spot, which is essentially lenticular, can, at a given cross section of the laser beam, be ensured without difficulties via an appropriate optical system.
- As the whole welding area for a carbide tooth is covered by the accordingly shaped focal spot of the laser beam, the saw blade and the carbide tooth, in another embodiment of the invention, can be preheated prior to welding in the area of the joint by means of the laser beam proper at a reduced output, so that the risk of fissures is further reduced.
- To reduce thermal stress, it is common practice for welding to subject the weld joint to a secondary thermal treatment. For this purpose the welding area between the saw blade and the carbide tooth may be reannealed after welding by means of the laser beam, too, at reduced output, so that, for completion of the saw, the welded-on carbide teeth need only be resharpened by grinding.
- By the example of the drawing the procedure according to the invention for fastening a carbide tooth at a saw blade is illustrated in detail.
- FIG. 1 shows a facility to accomplish the procedure in a schematic side view, and
- FIG. 2 depicts a saw with partly welded-on carbide teeth in a schematic horizontal projection.
- The
saw blade 2 to be equipped withcarbide teeth 1, which sawblade 2 may be either a single blade, an endless blade or a disk, depending on whether a mill saw blade, an endless saw blade or a circular saw blade shall be fabricated, is provided with preparedabutting surfaces 3 for welding on of thecarbide teeth 1 that already show the tooth geometry required later. To be able to exactly align theindividual carbide teeth 1 relative to theabutting surfaces 3 of thesaw blade 2 for the welding procedure, thesaw blade 2 is clamped, acc. to FIG. 1, into a holding device 4 in such a way that theabutting surface 3, to which therelevant carbide tooth 1 shall be welded on, is situated opposite to positioningtongs 5, by means of which therelevant carbide tooth 1 is set butt-jointed to the front-side abutting surface 3 of thesaw blade 2 and is held ready for welding. Thecarbide tooth 1 thus aligned relative to thesaw blade 2 and/or the abuttingsurface 3 is then welded to the abuttingsurface 3 of thesaw blade 2 by means of a laser welding device 6. For this purpose thelaser beam 7 is focussed via anoptical system 8 in such a way that a focal spot 9 is generated, as it is outlined in dashes in FIG. 2. This essentially lenticular focal spot 9 extends over the whole length of thejoint 10 established between a carbide tooth I and theabutting surface 3, so that, under conditions comparable to spot welding, the welded joint is created at the same time over the whole joint length. As the heat load is consequently largely regular over the joint length, the risk of fissures due to thermal stress is reduced and a way of fastening of the carbide teeth at thesaw blade 2 is ensured that meets all requirements, even if thesaw blade 2 is very thin to keep cutting gaps small. The welding area resulting from the selected shape of the focal spot between thecarbide teeth 1 and thesaw blade 2 is schematically indicated in FIG. 2 bycrosshatches 11. - The focal spot9 extending over the
whole welding area 11 provides the favorable possibility to apply an additional heat treatment at reduced output via thelaser beam 7. Thus it is possible, via thelaser beam 7, to preheat thelater welding area 11 to further reduce the risk of fissures due to thermal stress. Moreover, thewelding area 11 can be reannealed after welding to reduce existing thermal stress. Therefore, only the output of the laser welding device 6 needs to be controlled accordingly to preheat thelater welding area 11 prior to welding and then to perform welding at full laser output, before a secondary thermal treatment is applied, again at reduced output.
Claims (3)
1. Procedure for fastening a carbide tooth (1) at a saw blade (2), with the carbide tooth (1) fabricated according to the saw tooth geometry being held butt-jointed to the prepared front-side abutting surface (3) of the saw blade (2) and then being attached to the saw blade under addition of heat along the joint (10) between the saw blade (2) and the carbide tooth (1), characterised in that the carbide tooth is welded to the saw blade by means of a focal spot of a laser beam extending over the whole joint length.
2. Procedure according to , characterised in that the saw blade and the carbide tooth are preheated prior to welding in the area of the joint by means of the laser beam at reduced output.
claim 1
3. Procedure according to or , characterised in that the welding area is reannealed after welding by means of the laser beam at reduced output.
claim 1
2
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0218599A AT408080B (en) | 1999-12-27 | 1999-12-27 | METHOD FOR ATTACHING A HARD METAL TOOTH TO A SAW BLADE |
ATA2185/99 | 1999-12-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010006013A1 true US20010006013A1 (en) | 2001-07-05 |
US6310314B2 US6310314B2 (en) | 2001-10-30 |
Family
ID=3529544
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/745,680 Expired - Fee Related US6310314B2 (en) | 1999-12-27 | 2000-12-22 | Procedure for fastening a carbide tooth at a saw blade |
Country Status (9)
Country | Link |
---|---|
US (1) | US6310314B2 (en) |
EP (1) | EP1242208B1 (en) |
AT (1) | AT408080B (en) |
AU (1) | AU1975201A (en) |
CA (1) | CA2327676C (en) |
CZ (1) | CZ20022259A3 (en) |
DE (1) | DE50005824D1 (en) |
ES (1) | ES2218256T3 (en) |
WO (1) | WO2001053028A1 (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040060396A1 (en) * | 2002-08-12 | 2004-04-01 | Bohler Ybbstal Band Gmbh & Co. Kg | Starting material for saw blades or saw bands |
US20070101592A1 (en) * | 2005-10-20 | 2007-05-10 | Kraftool Mfg. (Shanghai) Co., Ltd. | Pivotable handsaw assembly |
US20070101588A1 (en) * | 2005-10-26 | 2007-05-10 | Kraftool Mfg. (Shanghai) Co., Ltd. | Handsaw assembly |
US20070101828A1 (en) * | 2005-10-10 | 2007-05-10 | Kraftool Mfg. (Shanghai) Co., Ltd. | Method for processing a saw blade |
US20070101591A1 (en) * | 2005-10-10 | 2007-05-10 | Kraftool Mfg. (Shanghai) Co., Ltd. | Hand saw |
US20070101589A1 (en) * | 2005-10-10 | 2007-05-10 | Kraftool Mfg. (Shanghai) Co., Ltd. | Multiangle cutting saw |
WO2009020901A1 (en) * | 2007-08-03 | 2009-02-12 | Baker Hughes Incorporated | Earth-boring tools having particle-matrix composite bodies, methods for welding particle-matrix composite bodies and methods for repairing particle-matrix composite bodies |
CN102500825A (en) * | 2011-10-25 | 2012-06-20 | 浙江约特工具有限公司 | Clamp for laser welding of double-metal band saw blade and welding device |
US20140166797A1 (en) * | 2012-12-17 | 2014-06-19 | Nolan Den Boer | Processor disk and method of making |
CN108544174A (en) * | 2018-05-18 | 2018-09-18 | 丹阳市宝利锯业机械有限公司 | A kind of band installs the automatic brazing machine of manipulator additional |
CN111823327A (en) * | 2020-07-10 | 2020-10-27 | 湖南泰嘉新材料科技股份有限公司 | Hard alloy band saw blade for woodwork |
US10933424B1 (en) | 2019-12-11 | 2021-03-02 | Pearson Incorporated | Grinding roll improvements |
US11534770B1 (en) | 2017-07-26 | 2022-12-27 | Pearson Incorporated | Systems and methods for step grinding |
US11751507B1 (en) | 2019-10-31 | 2023-09-12 | Hemp Processing Solutions, LLC | Crop harvesting system with plant stripping apparatus |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7181993B2 (en) * | 2001-02-06 | 2007-02-27 | Good Earth Tool Company | Apparatus and process for cutting of extruded material |
US20080264231A1 (en) * | 2007-04-25 | 2008-10-30 | Andrew Coe | Saw blade |
US20090032571A1 (en) * | 2007-08-03 | 2009-02-05 | Baker Hughes Incorporated | Methods and systems for welding particle-matrix composite bodies |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4337750A (en) * | 1980-10-08 | 1982-07-06 | Norton Company | Abrasion resistant diamond blade |
DE3216456A1 (en) * | 1982-05-03 | 1983-11-03 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD FOR Embedding Hard Materials In The Surface Of Chip Removal Tools |
DE3434714A1 (en) * | 1984-09-21 | 1986-04-03 | Horst 6450 Hanau Lach | Method of producing a circular saw blade |
DE4339661C2 (en) * | 1993-11-22 | 1996-09-26 | Fraunhofer Ges Forschung | Process for the production of tubular blanks from thin or very thin sheet |
DE19501442A1 (en) * | 1995-01-19 | 1996-07-25 | Scintilla Ag | Prodn. of cutting tools for machine tools, esp. saw blades |
EP0754519B1 (en) * | 1995-07-21 | 1999-06-02 | Ledermann GmbH | Method of making a rotary tool for operation with reward of swarf |
JP3449091B2 (en) * | 1996-01-26 | 2003-09-22 | 松下電工株式会社 | Saw blade |
-
1999
- 1999-12-27 AT AT0218599A patent/AT408080B/en not_active IP Right Cessation
-
2000
- 2000-12-06 CA CA002327676A patent/CA2327676C/en not_active Expired - Fee Related
- 2000-12-07 WO PCT/AT2000/000330 patent/WO2001053028A1/en not_active Application Discontinuation
- 2000-12-07 AU AU19752/01A patent/AU1975201A/en not_active Abandoned
- 2000-12-07 EP EP00982750A patent/EP1242208B1/en not_active Expired - Lifetime
- 2000-12-07 CZ CZ20022259A patent/CZ20022259A3/en unknown
- 2000-12-07 ES ES00982750T patent/ES2218256T3/en not_active Expired - Lifetime
- 2000-12-07 DE DE50005824T patent/DE50005824D1/en not_active Expired - Lifetime
- 2000-12-22 US US09/745,680 patent/US6310314B2/en not_active Expired - Fee Related
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040060396A1 (en) * | 2002-08-12 | 2004-04-01 | Bohler Ybbstal Band Gmbh & Co. Kg | Starting material for saw blades or saw bands |
US20070101828A1 (en) * | 2005-10-10 | 2007-05-10 | Kraftool Mfg. (Shanghai) Co., Ltd. | Method for processing a saw blade |
US20070101591A1 (en) * | 2005-10-10 | 2007-05-10 | Kraftool Mfg. (Shanghai) Co., Ltd. | Hand saw |
US20070101589A1 (en) * | 2005-10-10 | 2007-05-10 | Kraftool Mfg. (Shanghai) Co., Ltd. | Multiangle cutting saw |
US20070101592A1 (en) * | 2005-10-20 | 2007-05-10 | Kraftool Mfg. (Shanghai) Co., Ltd. | Pivotable handsaw assembly |
US20070101588A1 (en) * | 2005-10-26 | 2007-05-10 | Kraftool Mfg. (Shanghai) Co., Ltd. | Handsaw assembly |
US11370049B2 (en) | 2007-08-03 | 2022-06-28 | Baker Hughes Holdings Llc | Earth-boring tools having particle-matrix composite bodies and methods for welding particle-matrix composite bodies |
WO2009020901A1 (en) * | 2007-08-03 | 2009-02-12 | Baker Hughes Incorporated | Earth-boring tools having particle-matrix composite bodies, methods for welding particle-matrix composite bodies and methods for repairing particle-matrix composite bodies |
CN102500825A (en) * | 2011-10-25 | 2012-06-20 | 浙江约特工具有限公司 | Clamp for laser welding of double-metal band saw blade and welding device |
US20140166797A1 (en) * | 2012-12-17 | 2014-06-19 | Nolan Den Boer | Processor disk and method of making |
US9833785B2 (en) * | 2012-12-17 | 2017-12-05 | Kooima Company | Method of making a processor disk |
US11534770B1 (en) | 2017-07-26 | 2022-12-27 | Pearson Incorporated | Systems and methods for step grinding |
CN108544174A (en) * | 2018-05-18 | 2018-09-18 | 丹阳市宝利锯业机械有限公司 | A kind of band installs the automatic brazing machine of manipulator additional |
US11751507B1 (en) | 2019-10-31 | 2023-09-12 | Hemp Processing Solutions, LLC | Crop harvesting system with plant stripping apparatus |
US10933424B1 (en) | 2019-12-11 | 2021-03-02 | Pearson Incorporated | Grinding roll improvements |
US11077445B2 (en) | 2019-12-11 | 2021-08-03 | Pearson Incorporated | Grinding roll improvements |
US11826762B1 (en) | 2019-12-11 | 2023-11-28 | Pearson Incorporated | Grinding roll improvements |
CN111823327A (en) * | 2020-07-10 | 2020-10-27 | 湖南泰嘉新材料科技股份有限公司 | Hard alloy band saw blade for woodwork |
Also Published As
Publication number | Publication date |
---|---|
ATA218599A (en) | 2001-01-15 |
CZ20022259A3 (en) | 2003-12-17 |
US6310314B2 (en) | 2001-10-30 |
ES2218256T3 (en) | 2004-11-16 |
WO2001053028A1 (en) | 2001-07-26 |
EP1242208A1 (en) | 2002-09-25 |
DE50005824D1 (en) | 2004-04-29 |
CA2327676A1 (en) | 2001-06-27 |
AT408080B (en) | 2001-08-27 |
AU1975201A (en) | 2001-07-31 |
CA2327676C (en) | 2008-01-29 |
EP1242208B1 (en) | 2004-03-24 |
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