CN112974987B - Side grinding structure and method for hard alloy band saw blade tool bit - Google Patents
Side grinding structure and method for hard alloy band saw blade tool bit Download PDFInfo
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- CN112974987B CN112974987B CN202110489952.4A CN202110489952A CN112974987B CN 112974987 B CN112974987 B CN 112974987B CN 202110489952 A CN202110489952 A CN 202110489952A CN 112974987 B CN112974987 B CN 112974987B
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- saw blade
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- hard alloy
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 57
- 239000000956 alloy Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 18
- 244000089409 Erythrina poeppigiana Species 0.000 claims description 4
- 235000009776 Rathbunia alamosensis Nutrition 0.000 claims description 4
- 239000000463 material Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Classifications
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- 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
- B23D63/00—Dressing the tools of sawing machines or sawing devices for use in cutting any kind of material, e.g. in the manufacture of sawing tools
- B23D63/08—Sharpening the cutting edges of saw teeth
- B23D63/12—Sharpening the cutting edges of saw teeth by grinding
- B23D63/123—Sharpening the cutting edges of saw teeth by grinding using two or more grinding wheels simultaneously
Abstract
The invention discloses a side grinding structure and a side grinding method for a hard alloy band saw blade tool bit, which comprises a saw blade feeding at a constant speed, a hard alloy tool bit is welded on the tooth tip of the saw blade, two sides of the saw blade are respectively provided with a grinding wheel for grinding the side surface of the hard alloy tool bit, the grinding wheel is a frustum-shaped grinding wheel with a large-diameter end and a small-diameter end, the saw blade starts from the small-diameter end of the grinding wheel and keeps in contact with the outer circle grinding surface of the grinding wheel until the saw blade is separated from the large-diameter end of the grinding wheel and is in contact with the outer circle grinding surface of the grinding wheel, and the main shaft of the grinding wheel is arranged at an inclination angle A relative to the feeding direction of the saw blade, in the feeding process of the saw blade, the side surfaces of a plurality of hard alloy tool bits on the saw blade are simultaneously contacted with the outer circle grinding surface of the grinding wheel, and a grinding interval with the width of 3.5-4.5mm is formed on the outer circle grinding surface of the grinding wheel, so that the side surfaces of the hard alloy tool bits are ground by the grinding interval to obtain a better plane.
Description
Technical Field
The invention relates to a hard alloy band saw blade, in particular to a side grinding structure and a side grinding method for a tool bit of a hard alloy band saw blade.
Background
The hard alloy band saw blade is widely applied to saw cutting of metal materials which are difficult to cut, such as die steel, stainless steel, surface hardened steel, titanium and titanium alloy, nickel-based alloy, high-temperature alloy and the like, and is widely applied to saw cutting of aluminum alloy and hardwood materials at high speed. The hard alloy band saw blade products used in the current market mainly comprise a tooth separating type and a tooth non-separating type. The two hard alloy band saw blade products both use high-quality spring steel as a backing material, hard alloy particles are welded at the tooth tips as hard alloy tool bits, and the hard alloy tool bits are ground into sharp tooth tips through diamond grinding wheels, wherein the spring steel backing material can ensure the toughness and rigidity of the band body, and the hard alloy tooth tips ensure good cutting performance. The carbide tool bit generally has two kinds of balls and cylinder, and the ball generally is used for dividing tooth type carbide product, and the cylinder generally is used for not dividing tooth type carbide product. The hard alloy tool bit welded on the tooth tip needs to be subjected to three grinding processes of front angle grinding, rear angle grinding and side grinding to form a sharp tooth tip. The invention relates to a side grinding mode only.
As shown in fig. 1 and 2, in the conventional side grinding method, a pair of grinding wheels 3 'with the diameter phi of 70-75 mm are oppositely arranged on two sides of a saw blade 2', the saw blade 2 'moves from right to left, the two grinding wheels 3' respectively move up and down along an axis, the two sides of a cemented carbide tool bit 1 'are simultaneously ground, one tooth is fed each time, and the grinding wheels move up and down once or several times until the cemented carbide tool bit 1' is ground to a set side grinding size. The side grinding mode is to feed one tooth and grind one tooth at a time, and then feed one tooth and grind one tooth. The above steps are repeated, and grinding is carried out discontinuously until the complete disc saw blade is ground.
The grinding wheel adopted by the existing side grinding is a butterfly-shaped carborundum grinding wheel, and because the diameter of the butterfly-shaped carborundum grinding wheel is small (generally about phi 70-75 mm), as shown in figure 3, the side grinding mode has the following problems:
(1) the side surface of the cemented carbide tool bit which is milled out from the side is obviously arc-shaped;
(2) the grinding wheel shafts on the two sides of the saw blade have front and back dislocation errors, so that the arc-shaped parts on the two sides of the hard alloy tool bit have front and back dislocation phenomena;
(3) the thickness of the grinding wheels on the two sides is only 2-3 mm, so that the grinding wheel is high in abrasion speed, and the problem that the abrasion loss of the grinding wheels on the two sides is inconsistent exists, so that the arc shapes ground on the two sides are different;
(4) the side grinding mode is to send a tooth and grind a hard alloy cutter head, so the grinding efficiency is low.
The problem of arc and the convex dislocation that current side grinding mode formed can lead to the side blade shaping of saw blade bad, produces the tipping easily in sawing, leads to the saw blade to appear early inefficacy.
Disclosure of Invention
The invention aims to solve the technical problem that the side grinding shape of the tool bit of the hard alloy band saw blade is poor in the prior art, and provides a structure and a method for improving the side grinding shape of the tool bit of the hard alloy band saw blade and realizing continuous grinding of the tool bit of the hard alloy band saw blade.
In order to solve the technical problem, the invention provides a side grinding structure of a hard alloy band saw blade tool bit, which comprises a saw blade feeding at a constant speed, a hard alloy tool bit is welded on the tooth tip of the saw blade, two sides of the saw blade are respectively provided with a grinding wheel for grinding the side surface of the hard alloy tool bit, the grinding wheel is a frustum-shaped grinding wheel with a large-diameter end and a small-diameter end, the saw blade is in contact with the outer circle grinding surface of the grinding wheel from the small-diameter end of the grinding wheel, and is separated from the large-diameter end of the grinding wheel and is contacted with the excircle grinding surface of the grinding wheel, and the main shaft of the grinding wheel is arranged at an inclination angle A relative to the feeding direction of the saw blade, in the feeding process of the saw blade, the side surfaces of a plurality of hard alloy tool bits on the saw blade are simultaneously contacted with the excircle grinding surface of the grinding wheel, and a grinding interval with the width of 3.5-4.5mm distributed along the axis of the grinding wheel is formed on the cylindrical grinding surface of the grinding wheel.
The invention replaces the butterfly-shaped grinding wheel which is adopted traditionally with the frustum-shaped grinding wheel, and the saw blade is contacted with the external grinding surface of the frustum-shaped grinding wheel from the small-diameter end of the frustum-shaped grinding wheel, and is separated from the large-diameter end of the frustum-shaped grinding wheel and is contacted with the external grinding surface of the frustum-shaped grinding wheel, and the main shaft of the frustum-shaped grinding wheel is arranged at an inclination angle A of 2-2.5 degrees relative to the feeding direction of the saw blade, in the feeding process of the saw blade, the side surfaces of a plurality of hard alloy tool bits on the saw blade are simultaneously ground by the outer grinding surface of the frustum-shaped grinding wheel, a grinding interval with the width of 3.5-4.5mm distributed along the axis of the frustum-shaped grinding wheel is formed on the outer grinding surface of the frustum-shaped grinding wheel, the side surface of each hard alloy tool bit is ground for a plurality of times at different positions of the grinding interval of the frustum-shaped grinding wheel to form a flat plane, thereby the two side surfaces of the hard alloy cutter head are symmetrical in shape, and the side grinding continuous grinding can be realized.
In order to ensure the grinding flatness of the side surface of the hard alloy tool bit, greatly improve the wear resistance and service life of the grinding wheel and ensure the stable grinding of the width dimension between the planes on the two sides of the hard alloy tool bit, the thickness of the grinding wheel is far larger than the diameter of the hard alloy tool bit (generally 40-50 times of the diameter of the hard alloy tool bit). The thickness of the grinding wheel is preferably 80mm-100 mm.
In order to ensure that a grinding interval with the width of 3.5-4.5 is formed on the cylindrical grinding surface of the grinding wheel, the relation between the inclination angle A and the thickness of the grinding wheel satisfies the following conditions: sinA = grinding interval width/grinding wheel thickness.
In order to ensure the position stability of the saw blade in the continuous grinding process, the two grinding wheels are arranged in the front and back direction of the feeding direction of the saw blade so as to facilitate the installation of the positioning jaw. Because the grinding wheel has lateral extrusion force, the other side of the grinding surface of the grinding wheel corresponding to the saw blade is provided with a positioning jaw, and the positioning stability of the saw blade is ensured.
In order to facilitate the uniform transmission of the saw blade, the side grinding structure of the tool bit of the hard alloy band saw blade further comprises a traction driving device for drawing the saw blade to move at a uniform speed.
Based on the same invention concept, the invention also provides a side grinding method of the tool bit of the hard alloy band saw blade, which comprises the following steps:
a traction driving device is arranged to enable the saw blade to move at a constant speed;
the two sides of the saw blade are respectively provided with a frustum-shaped grinding wheel, the saw blade moves from the small-diameter end of the frustum-shaped grinding wheel to the large-diameter end of the frustum-shaped grinding wheel, the main shaft of the frustum-shaped grinding wheel is arranged relative to the feeding direction of the saw blade at an inclination angle A, in the moving process of the saw blade, a plurality of hard alloy tool bits on the saw blade are simultaneously contacted with the outer circle grinding surface of the frustum-shaped grinding wheel, so that a grinding interval with the width of 3.5-4.5mm is formed on the outer circle grinding surface of the frustum-shaped grinding wheel, and the side surface of each hard alloy tool bit is ground by the grinding interval of the frustum-shaped grinding wheel to obtain a better plane.
Compared with the prior art, the invention has the beneficial effects that: the invention solves the problem of arc shape formation after side grinding and the problem of asymmetrical left and right grinding shape through the innovative improvement of the side grinding technology, can realize the continuous grinding of the side grinding, and greatly prolongs the service life of the grinding wheel.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a plan view of a conventional side grinding structure, in which an arrow indicates a feeding direction of a saw blade.
Fig. 2 is a side view of a conventional side grinding structure.
Fig. 3 is a partially enlarged view of a conventional side grinding structure.
Fig. 4 is a top view of the side grinding structure of the present invention, with the arrows showing the direction of feed of the saw blade.
Fig. 5 is a side view of the side grinding structure of the present invention.
Fig. 6 is a sectional view of the grinding position of the grinding wheel of the present invention.
Fig. 7 is a partially enlarged view of the grinding position of the grinding wheel of the present invention.
FIG. 8 is a view showing the engagement of the saw blade with the grinding wheel when the saw blade of the present invention is fed.
FIG. 9 is a schematic diagram of the angle of inclination and the grinding interval of the grinding wheel spindle according to the present invention.
In the figure:
1', a hard alloy cutter head; 2', a saw blade; 3', a grinding wheel;
1. a cemented carbide tip; 2. a saw blade; 3. a grinding wheel; 31. a large diameter end; 32. a small diameter end; 33. grinding the interval; 34. a main shaft; A. the angle of inclination.
Detailed Description
The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.
For convenience of description, the relative positional relationship of the components, such as: the descriptions of the upper, lower, left, right, etc. are described with reference to the layout directions of the drawings in the specification, and do not limit the structure of the present patent.
As shown in fig. 4-9, an embodiment of the side grinding structure for the tool bit of the cemented carbide band saw blade according to the present invention includes a saw blade 2 that is fed at a constant speed, a cemented carbide tool bit 1 is welded to a tooth tip of the saw blade 2, and a grinding wheel 3 for grinding a side surface of the cemented carbide tool bit 1 is respectively disposed on two sides of the saw blade 2.
The grinding wheel 3 is a frustum-shaped grinding wheel having a large diameter end 31 and a small diameter end 32, typically the diameter of the small diameter end is 0.8mm smaller than the diameter of the large diameter end. The saw blade 2 is in contact with the outer circle grinding surface of the grinding wheel 3 from the small diameter end 32 of the grinding wheel 3, and is separated from the large diameter end 31 of the grinding wheel 3 to be in contact with the outer circle grinding surface of the grinding wheel 3, the main shaft of the grinding wheel 3 is arranged at an inclination angle A of 2-2.5 degrees relative to the feeding direction of the saw blade 2, in the feeding process of the saw blade 2, the side surfaces of a plurality of hard alloy tool bits 1 on the saw blade 2 are simultaneously in contact with the outer circle grinding surface of the grinding wheel 3, and a grinding interval 33 with the width of about 4.0mm is formed on the outer circle grinding surface of the grinding wheel 3.
Since the saw blade 2 is continuously fed at a constant speed, namely the outer grinding surface of the grinding wheel 3 is always ground with the carbide tool bit 1, the result of continuous grinding in the grinding section 33 is similar to a plane.
In order to ensure the grinding flatness of the side surface of the hard alloy tool bit, greatly improve the wear resistance and service life of the grinding wheel 3 and ensure that the width dimension between the planes on the two sides of the hard alloy tool bit is more stable, the thickness B of the grinding wheel 3 is far larger than the diameter of the hard alloy tool bit 1. Preferably, the thickness B of the grinding wheel 3 is 40 to 50 times the diameter of the cemented carbide insert 1. In this embodiment, the diameter of the grinding wheel 3 is 300mm, and the thickness is 100 mm. The diameter of the hard alloy cutter head 1 is phi 1.8-phi 2.5 mm.
In order to ensure that a grinding interval 33 with the width of about 4.0mm is formed on the cylindrical grinding surface of the grinding wheel 3, the relation between the inclination angle A and the thickness of the grinding wheel satisfies the following conditions: sinA = grinding interval width/grinding wheel thickness. In this embodiment, the grinding section 33 has a width of 4.0mm and a grinding wheel thickness of 100mm, so the inclination angle A is 2.5 °.
In order to ensure the stability of the movement of the saw blade 2, the two grinding wheels 3 are arranged back and forth in the feeding direction of the saw blade 2.
In order to facilitate the uniform transmission of the saw blade 2, the side grinding structure of the tool bit of the hard alloy band saw blade further comprises a traction driving device for drawing the saw blade to move at a uniform speed.
When the side grinding structure for the tool bit of the hard alloy band saw blade is used, the traction driving device drives the saw blade 2 to move at a constant speed, the saw blade 2 is enabled to feed from the small diameter end 32 of the grinding wheel 3 to the large diameter end 31 of the grinding wheel 3, the grinding wheels 3 on two sides of the saw blade 2 keep stationary and rotate continuously, continuous grinding of the hard alloy tool bit 1 on the saw blade 2 is achieved, the hard alloy tool bits 1 on the saw blade 2 are ground by the outer circle grinding surface of the grinding wheel 3 at the same time, and the side surface of each hard alloy tool bit 1 is ground by different positions of the grinding interval 33 of the grinding wheel 3 to obtain a better plane.
The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.
Claims (7)
1. A side grinding structure of a hard alloy band saw blade tool bit comprises a saw blade which feeds at a constant speed, a hard alloy tool bit is welded on the tooth tip of the saw blade, two sides of the saw blade are respectively provided with a grinding wheel used for grinding the side surface of the hard alloy tool bit, the side grinding structure is characterized in that,
the grinding wheel is a frustum-shaped grinding wheel with a large-diameter end and a small-diameter end, the saw blade starts from the small-diameter end of the grinding wheel and keeps in contact with the outer circle grinding surface of the grinding wheel until the saw blade is separated from the large-diameter end of the grinding wheel and is in contact with the outer circle grinding surface of the grinding wheel, a spindle of the grinding wheel is arranged in a plane parallel to the saw blade body and forms an inclination angle A relative to the feeding direction of the saw blade, in the feeding process of the saw blade, the side surfaces of a plurality of hard alloy tool bits on the saw blade are simultaneously in contact with the outer circle grinding surface of the grinding wheel, and a grinding interval with the width of 3.5-4.5mm is formed on the outer circle grinding surface of the grinding wheel.
2. A cemented carbide band saw blade tip side sharpening configuration as claimed in claim 1, wherein the thickness of the grinding wheel is substantially greater than the diameter of the cemented carbide tip.
3. The carbide band saw blade bit side grinding structure as claimed in claim 1, wherein said inclination angle a is related to the grinding wheel thickness by the following relationship: sinA = grinding interval width/grinding wheel thickness.
4. A cemented carbide band saw blade tip side sharpening structure as claimed in claim 1, wherein two of said grinding wheels are disposed one behind the other in a feed direction of said saw blade.
5. The structure of claim 1, further comprising a traction drive for drawing the saw blade at a constant speed.
6. A side grinding method for a hard alloy band saw blade tool bit is characterized in that,
a traction driving device is arranged to enable the saw blade to move at a constant speed;
the two sides of the saw blade are respectively provided with a frustum-shaped grinding wheel, the saw blade moves from the small-diameter end of the frustum-shaped grinding wheel to the large-diameter end of the frustum-shaped grinding wheel, the plane parallel to the saw blade body of a main shaft of the frustum-shaped grinding wheel is opposite to the feeding direction of the saw blade, in the moving process of the saw blade, a plurality of hard alloy tool bits on the saw blade are simultaneously contacted with the outer circle grinding surface of the frustum-shaped grinding wheel, so that a grinding interval with the width of 3.5-4.5mm is formed on the outer circle grinding surface of the frustum-shaped grinding wheel, and the side surface of each hard alloy tool bit is ground by the grinding interval of the frustum-shaped grinding wheel to obtain a better plane.
7. The method of claim 6, wherein the relationship between the inclination angle A and the thickness of the grinding wheel satisfies the following relationship: sinA = grinding interval width/grinding wheel thickness.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN202011525145.5A CN112620799A (en) | 2020-12-22 | 2020-12-22 | Side grinding structure and method for hard alloy band saw blade tool bit |
CN2020115251455 | 2020-12-22 |
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CN112974987A CN112974987A (en) | 2021-06-18 |
CN112974987B true CN112974987B (en) | 2022-02-01 |
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CN202011525145.5A Withdrawn CN112620799A (en) | 2020-12-22 | 2020-12-22 | Side grinding structure and method for hard alloy band saw blade tool bit |
CN202110489952.4A Active CN112974987B (en) | 2020-12-22 | 2021-05-06 | Side grinding structure and method for hard alloy band saw blade tool bit |
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CN202011525145.5A Withdrawn CN112620799A (en) | 2020-12-22 | 2020-12-22 | Side grinding structure and method for hard alloy band saw blade tool bit |
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB165641A (en) * | 1920-05-29 | 1921-07-07 | Jean Toussaint Lanfranchi | Machine for sharpening with a grindstone circular and band-saws |
CN85106207A (en) * | 1985-08-15 | 1987-03-04 | 格布鲁特·杭斯伯格股份公司特殊工具及锯片制造厂 | Produce the method for saw blade |
CN2038824U (en) * | 1988-01-11 | 1989-06-07 | 黄河清 | Vertical grinding machine for strap sawing machine |
DE10121370A1 (en) * | 2001-05-02 | 2002-11-14 | Heike Mulzet | Grinding machine, especially for sawblades, has parallel sawblades mounted on spindles in specific geometric arrangement |
CN202224767U (en) * | 2011-07-01 | 2012-05-23 | 当阳市青松锯业有限责任公司 | Water feed type saw blade bevel-angle tooth grinding machine |
CN203227890U (en) * | 2013-02-08 | 2013-10-09 | 株式会社天田 | Band saw blade tooth graduation processing machine |
CN112059302A (en) * | 2020-09-02 | 2020-12-11 | 湖南泰嘉新材料科技股份有限公司 | Sawtooth forming method |
-
2020
- 2020-12-22 CN CN202011525145.5A patent/CN112620799A/en not_active Withdrawn
-
2021
- 2021-05-06 CN CN202110489952.4A patent/CN112974987B/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB165641A (en) * | 1920-05-29 | 1921-07-07 | Jean Toussaint Lanfranchi | Machine for sharpening with a grindstone circular and band-saws |
CN85106207A (en) * | 1985-08-15 | 1987-03-04 | 格布鲁特·杭斯伯格股份公司特殊工具及锯片制造厂 | Produce the method for saw blade |
CN2038824U (en) * | 1988-01-11 | 1989-06-07 | 黄河清 | Vertical grinding machine for strap sawing machine |
DE10121370A1 (en) * | 2001-05-02 | 2002-11-14 | Heike Mulzet | Grinding machine, especially for sawblades, has parallel sawblades mounted on spindles in specific geometric arrangement |
CN202224767U (en) * | 2011-07-01 | 2012-05-23 | 当阳市青松锯业有限责任公司 | Water feed type saw blade bevel-angle tooth grinding machine |
CN203227890U (en) * | 2013-02-08 | 2013-10-09 | 株式会社天田 | Band saw blade tooth graduation processing machine |
CN112059302A (en) * | 2020-09-02 | 2020-12-11 | 湖南泰嘉新材料科技股份有限公司 | Sawtooth forming method |
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CN112974987A (en) | 2021-06-18 |
CN112620799A (en) | 2021-04-09 |
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Effective date of registration: 20221229 Address after: No.68, Taijia Road, Wangcheng economic and Technological Development Zone, Changsha, Hunan 410200 Patentee after: Hunan Taijia Intelligent Technology Co.,Ltd. Address before: No. 68, Taijia Road, Wangcheng Economic Development Zone, Changsha City, Hunan Province Patentee before: BICHAMP CUTTING TECHNOLOGY (HUNAN) Co.,Ltd. |