CN110103086B - PCB milling cutter fishtail grinding process - Google Patents
PCB milling cutter fishtail grinding process Download PDFInfo
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- CN110103086B CN110103086B CN201910378566.0A CN201910378566A CN110103086B CN 110103086 B CN110103086 B CN 110103086B CN 201910378566 A CN201910378566 A CN 201910378566A CN 110103086 B CN110103086 B CN 110103086B
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- milling cutter
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- 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
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- 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
- B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
- B24B3/02—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters
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- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Milling Processes (AREA)
Abstract
A fishtail grinding process for a PCB milling cutter relates to the technical field of cutter processing, wherein a grinding wheel circumferential surface is adopted to grind the end surface of the milling cutter to form a fishtail type double-edge milling cutter, a processing station comprises an upper processing and a lower processing, the upper processing uses the inner side of the circumferential surface of the grinding wheel to grind the milling cutter, the lower processing uses the outer side of the circumferential surface of the grinding wheel to grind the milling cutter, the fishtail type double-edge of the milling cutter finishes grinding in the upper processing and/or the lower processing, and the grinding wheel is trimmed after the inner side and the outer side of the circumferential surface of the grinding. The fishtail-shaped double-edge grinding device provided by the invention grinds fishtail-shaped double-edges of the milling cutter by using two processing stations, the inner side and the outer side of the circumferential surface of the grinding wheel are fully utilized, the number of milling cutters which can be processed after the grinding wheel is trimmed once is twice that of the milling cutter in the prior art, the trimming frequency of the grinding wheel is shortened, the processing efficiency of personnel is improved, and the total service life of the grinding wheel is doubled.
Description
Technical Field
The invention relates to the technical field of cutter processing, in particular to a fishtail grinding process for a PCB milling cutter.
Background
The fishtail processing procedure is a procedure for manufacturing a bottom blade of the PCB milling cutter, and is mainly used for grinding the bottom blade of a bar material which passes through a left-handed groove or a right-handed groove. The grinding wheel mounted on the fishtail machine can only grind in one direction, so that the conventional fishtail grinding process only uses one side of the circumferential surface of the grinding wheel to grind, the grinding wheel needs to be dressed after processing 8000-20000 milling cutters, the single dressing amount is 0.200-1.000 mm, and the total dressing times of a single grinding wheel is 15-30 times. This grinding process does not make full use of the circumferential surface of the grinding wheel and requires frequent dressing of the grinding wheel.
Disclosure of Invention
The invention aims to provide a fishtail grinding process for a PCB milling cutter, which grinds a fishtail of the milling cutter by using two processing stations, fully utilizes the inner side and the outer side of the circumferential surface of a grinding wheel, and doubles the number of the milling cutters which can be processed after the grinding wheel is trimmed once compared with the prior art, so that the total service life of the grinding wheel is doubled.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fishtail grinding process for a PCB milling cutter comprises the steps of grinding the end face of the milling cutter by adopting the circumferential surface of a grinding wheel to form a fishtail type double-edge milling cutter, wherein a processing station comprises an upper processing and a lower processing, the upper processing uses the inner side of the circumferential surface of the grinding wheel to grind the milling cutter, the lower processing uses the outer side of the circumferential surface of the grinding wheel to grind the milling cutter, the fishtail type double edges of the milling cutter finish grinding in the upper processing and/or the lower processing, and the grinding wheel is trimmed after the inner side and the outer side of the circumferential surface of the.
Further, during grinding, the end face of the milling cutter is attached to the circumferential surface of the grinding wheel, the central axis of the milling cutter intersects with the circumferential surface of the grinding wheel at a point M, when the upper machining is adopted, the radius of the grinding wheel passing through the point M forms an included angle beta with the X axis, and when the lower machining is adopted, the radius of the grinding wheel passing through the point M forms an included angle-beta with the X axis.
Furthermore, the included angle of the fishtail type double edges of the milling cutter is alpha, and beta is (180-alpha)/2.
Further, α is 100 ° to 170 °.
Further, the milling cutter is fed in the X-axis direction, and during grinding, a surface to be ground, in which the end surface of the milling cutter edge portion exceeds 1/2, is bonded to the circumferential surface of the grinding wheel as viewed in the X-axis direction, that is, the grinding wheel performs overcut grinding on the end surface of the milling cutter.
Furthermore, the clearance between the two cutting edges of the milling cutter is L, and the over-cutting width of the grinding wheel to the first cutting edge and the second cutting edge of the milling cutter is 0.5L.
Further, L is 0.05mm to 1.0 mm.
Further, the manufacturing of the fishtail type double-edge of the milling cutter by the upper processing comprises the following steps:
a1, attaching a surface to be ground, of which the end face of the edge part of the milling cutter exceeds 1/2, to the circumferential surface of a grinding wheel, grinding the end face of the milling cutter by adopting the inner side of the circumferential surface of the grinding wheel, intersecting the central axis of the milling cutter and the circumferential surface of the grinding wheel at a point M, forming an included angle beta between the radius of the grinding wheel passing through the point M and the X axis, and feeding the milling cutter along the X axis until the first edge of the milling cutter is ground;
and A2, rotating the milling cutter by 180 degrees along the central axis of the milling cutter, completely attaching the end faces to be ground of the milling cutter in the step A1 to the inner side of the circumferential surface of the grinding wheel, feeding the milling cutter along the X-axis direction until the second edge of the milling cutter is ground, wherein the ground area of the end face of the edge part of the milling cutter is larger than the whole area of the end face of the milling cutter of 1/2.
Further, the manufacturing of the fishtail type double-edged blade of the milling cutter by the lower-position machining comprises the following steps:
b1, attaching the surface to be ground, of which the end face exceeds 1/2, of the edge part of the milling cutter to the circumferential surface of the grinding wheel, grinding the end face of the milling cutter by adopting the outer side of the circumferential surface of the grinding wheel, intersecting the central shaft of the milling cutter and the circumferential surface of the grinding wheel at a point M, forming an included angle-beta between the radius of the grinding wheel passing through the point M and the X axis, and feeding the milling cutter along the X axis until the first edge of the milling cutter is ground;
and B2, rotating the milling cutter by 180 degrees along the central axis of the milling cutter, completely attaching the end face to be ground of the milling cutter in the step B1 to the outer side of the circumferential surface of the grinding wheel, feeding the milling cutter along the X-axis direction until the second edge of the milling cutter is ground, wherein the ground area of the end face of the edge part of the milling cutter is larger than the whole area of the end face of the milling cutter of 1/2.
Compared with the prior art, the invention has the following beneficial effects:
the fishtail grinding process for the PCB milling cutter comprises two processing stations, wherein the fishtail type double-edge of the milling cutter is manufactured by adopting upper processing and lower processing, the inner side and the outer side of the circumferential surface of the grinding wheel are fully utilized, and after the inner side and the outer side of the circumferential surface of the grinding wheel are excessively worn, the grinding wheel is dressed, so that the number of fishtails of the milling cutter produced after the circumferential surface of the grinding wheel is dressed once is doubled, and the service life of the grinding wheel is totally doubled.
Drawings
FIG. 1 shows the relative positions of a milling cutter and a grinding wheel in an upper machining and a lower machining;
FIG. 2 is an enlarged schematic view of the upper processing at C in FIG. 1;
FIG. 3 is an enlarged schematic view of the lower position of the process of FIG. 1 at D;
FIG. 4 is a schematic view of the milling cutter of this embodiment, with a fish tail tip at E;
FIG. 5 is a fishtail double-edged front view of the milling cutter;
fig. 6 shows a schematic wheel mounting diagram of the present embodiment.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and detailed description.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In fig. 1 to 3 and 6, the horizontal direction, the vertical direction, and the direction perpendicular to the paper surface in the drawings correspond to the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively, described in the present embodiment.
The milling cutter in this embodiment has a shank and an edge, and before the milling cutter is ground, the end surface to be ground of the edge is a plane. In this embodiment, as shown in fig. 4, the included angle of the fishtail-shaped double cutting edges of the milling cutter is set to α, and as shown in fig. 5, the clearance between the double cutting edges is set to L. The milling cutter is held by a chuck and fed toward the circumferential surface of the grinding wheel 1 in the X-axis direction. The chuck is controlled by a pull rod cylinder and the chuck is rotatable at least 180 deg..
Referring to fig. 1 to 5, the invention discloses a fishtail grinding process for a PCB milling cutter, which comprises the steps of grinding the end face of the milling cutter by using the circumferential surface of a grinding wheel 1 to form a fishtail type double-edged milling cutter, wherein the processing station comprises an upper processing and a lower processing, the upper processing uses the inner side of the circumferential surface of the grinding wheel 1 to grind the milling cutter, the lower processing uses the outer side of the circumferential surface of the grinding wheel 1 to grind the milling cutter, the fishtail type double edges of the milling cutter finish grinding in the upper processing and/or the lower processing, and the grinding wheel 1 is trimmed after the inner side and the outer side of the circumferential. Grinding is carried out by adopting two stations of upper processing and lower processing, the inner side and the outer side of the circumferential surface of the grinding wheel 1 are fully utilized, and after the inner side and the outer side of the circumferential surface of the grinding wheel 1 are excessively worn, the grinding wheel 1 is trimmed. The two processing stations enable the number of fishtails of the milling cutter produced after the circumferential surface of the grinding wheel 1 is trimmed once to be doubled, the trimming frequency is reduced, the processing efficiency of workers is improved, and the service life of the grinding wheel 1 is totally doubled.
During grinding, the end face of the milling cutter is attached to the circumferential surface of the grinding wheel 1, the central shaft of the milling cutter and the circumferential surface of the grinding wheel 1 are intersected at a point M, the radius of the grinding wheel 1 passing through the point M forms an included angle beta with the X axis when the upper machining is adopted, and the radius of the grinding wheel 1 passing through the point M forms an included angle-beta with the X axis when the lower machining is adopted. The included angle of the fishtail type double edge is alpha, beta is (180-alpha)/2, and preferably alpha is 100-170 degrees.
Further, the milling cutter is fed toward the circumferential surface of the grinding wheel 1 from the X-axis direction, and during grinding, the surface to be ground having the edge surface of the milling cutter blade portion exceeding 1/2 is bonded to the circumferential surface of the grinding wheel 1 as viewed from the X-axis direction, that is, the grinding wheel 1 performs overcut grinding on the edge surface of the milling cutter. The clearance of two cutting edges of milling cutter is L, and preferably, emery wheel 1 is 0.5L to the width of cutting excessively of the first sword of milling cutter and second sword, makes the twolip of milling cutter be symmetrical structure, and is not only pleasing to the eye, makes the twolip atress more even when processing PCB board with it, is difficult for tipping.
It should be noted that when the grinding wheel 1 grinds a single edge of a milling cutter, the grinding area of the end face of the edge portion of the milling cutter is preferably not more than 2/3 of the end area, so as to avoid the problem that the edge is too thin and insufficient in strength, which is likely to cause edge breakage during use. Preferably, L is 0.05mm to 1.0 mm.
The process of grinding two edges of a milling cutter in sequence at the same machining station is described in detail below.
The fishtail type double-edge milling cutter manufactured by adopting the upper processing comprises the following steps:
a1, grinding wheel 1 rotates along Z axis at high speed, the chuck clamps the milling cutter and feeds the end face of the milling cutter towards the circumferential face of the grinding wheel 1 along X axis direction, the face to be ground with the edge part end face of the milling cutter exceeding 1/2 is attached to the circumferential face of the grinding wheel 1, the end face of the milling cutter is ground by adopting the inner side of the circumferential face of the grinding wheel 1, the central axis of the milling cutter and the circumferential face of the grinding wheel 1 are intersected at a point M, the radius of the grinding wheel 1 passing through the point M and the X axis form an included angle beta, the ground area of the edge part end face of the milling cutter is larger than 1/2 of the whole end area of the milling cutter seen from X axis direction, namely, the milling cutter 1 performs over;
a2, the milling cutter is rotated by 180 degrees along the central axis of the milling cutter, the end faces to be ground of the remaining milling cutter in the step A1 are completely attached to the inner side of the circumferential surface of the grinding wheel 1, the ground area of the end face of the edge part of the milling cutter is larger than 1/2 of the whole end area of the milling cutter, the milling cutter is fed along the X-axis direction, and the grinding wheel 1 carries out over-cutting grinding on the end face of the milling cutter until the second edge of the milling cutter is ground.
The fishtail type double-edge milling cutter manufactured by adopting the lower machining comprises the following steps:
b1, grinding wheel 1 rotates along Z axis at high speed, the chuck clamps the milling cutter and feeds the end face of the milling cutter towards the circumferential face of the grinding wheel 1 along X axis direction, the face to be ground with the edge part end face of the milling cutter exceeding 1/2 is attached to the circumferential face of the grinding wheel 1, the end face of the milling cutter is ground by adopting the outer side of the circumferential face of the grinding wheel 1, the central axis of the milling cutter and the circumferential face of the grinding wheel 1 are intersected at a point M, the radius of the grinding wheel 1 passing through the point M and the X axis form an included angle-beta, the ground area of the edge part end face of the milling cutter is larger than 1/2 of the whole end area of the milling cutter seen from X axis direction, namely, the milling cutter 1 performs over;
b2, the milling cutter is rotated by 180 degrees along the central axis of the milling cutter, the end faces to be ground of the remaining milling cutter in the step B1 are completely attached to the outer side of the circumferential surface of the grinding wheel 1, the ground area of the end face of the edge part of the milling cutter is larger than 1/2 of the whole end area of the milling cutter, the milling cutter is fed along the X-axis direction, and the grinding wheel 1 carries out over-cutting grinding on the end face of the milling cutter until the second edge of the milling cutter is ground.
In this embodiment, the overcut widths of the grinding wheel 1 to the milling cutter in the step a1 and the step a2 are the same, the overcut widths of the grinding wheel 1 to the milling cutter in the step B1 and the step B2 are the same, and for the milling cutter with the gap between the two edges being L, the overcut widths in the steps a1, a2, B1 and B2 are all 0.5L, so that the distances from the two edges of the milling cutter to the central axis of the milling cutter are the same, the fishtail is more beautiful, and the two edges of the milling cutter are uniformly stressed when a PCB is processed.
It will be appreciated by those skilled in the art that the two edges of the milling cutter can be manufactured by grinding at two separate stations, for example, the first edge of the milling cutter is ground at the upper position and the second edge of the milling cutter is ground at the lower position, and it should be noted that in this way, the position of the grinding wheel 1 is switched to switch the machining stations, and the grinding of the second edge is performed without rotating the milling cutter 180 ° after the first sharpening of the milling cutter is completed.
In the present embodiment, the inner side of the circumferential surface of the grinding wheel 1 means the circumferential surface near the rear end surface of the grinding wheel 1, and the outer side of the circumferential surface of the grinding wheel 1 means the circumferential surface near the front end surface of the grinding wheel 1. As mentioned above, β is (180 ° - α)/2, that is, if α is 140 °, β is 20 °. The area of the blade to be ground is preferably no more than 2/3 of the entire end area of the blade to avoid the blade being too thin to break easily.
In this embodiment, as shown in fig. 6, the grinding wheel 1 is fixed to the grinding wheel 1 holder 2 with the center axis of the grinding wheel 1 along the Z-axis direction. The rotating shaft of the grinding wheel 1 is connected with the rotating shaft of the motor 3 through a belt, and the motor 3 drives the grinding wheel 1 to rotate. The grinding wheel seat 2 and the motor 3 are fixed on a lifting seat 4, and the lifting seat 4 is driven by a lifting oil cylinder 5 to move up and down along the Y axis so as to adjust the position of the lifting seat relative to the milling cutter. The lifting seat 4 is provided with a manual adjusting device and a scale hand wheel, the manual adjusting device is matched with the scale hand wheel to limit the grinding wheel seat 2, and the position of the grinding wheel seat 2 is finely adjusted. The upper machining and the lower machining are switched by adopting a swing angle oil cylinder to control the movement of the grinding wheel 1. The size of the included angle of the fishtail type double-blade is changed by controlling the height of the position of the grinding wheel 1.
As shown in fig. 1 to 3, in the upper processing, the side of the circumferential surface of the grinding wheel 1 away from the human body, that is, the side close to the rear end face of the grinding wheel 1 is used, and after 8000 to 20000 fishtail-type double-edged milling cutters are processed in the upper processing, the inner side of the circumferential surface of the grinding wheel 1 is excessively worn. In the lower machining, the circumferential surface of the grinding wheel 1 is close to the human body, namely close to the left end face of the grinding wheel 1. After 8000-20000 fishtail-shaped double-edge milling cutters are machined in the upper machining mode and the lower machining mode, the inner side and the outer side of the circumferential surface of the grinding wheel 1 are excessively abraded, the whole circumferential surface of the grinding wheel 1 is trimmed, and the existing grinding wheel trimming machine in the market can be adopted as equipment for trimming the grinding wheel 1.
According to the grinding process disclosed by the invention, each time the grinding wheel is dressed, 16000-40000 milling cutters can be machined. The single trimming amount of the circumferential surface of the grinding wheel is 0.200 mm-1.000 mm, and the total trimming times of a single grinding wheel is 15-30 times. Compared with the existing grinding process, the number of the milling cutters which can be processed by a single grinding wheel is doubled, namely the service life of the grinding wheel is doubled.
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (8)
1. A PCB milling cutter fish tail grinding process is characterized in that: grinding the end face of a milling cutter by adopting the circumferential surface of a grinding wheel to form a fishtail-shaped double-edged milling cutter, wherein the processing station comprises upper processing and lower processing, the upper processing uses the inner side of the circumferential surface of the grinding wheel to grind the milling cutter, the lower processing uses the outer side of the circumferential surface of the grinding wheel to grind the milling cutter, the fishtail-shaped double edges of the milling cutter finish grinding in the upper processing and/or the lower processing, and the grinding wheel is trimmed after the inner side and the outer side of the circumferential surface of the grinding wheel are excessively worn;
during grinding, the end face of the milling cutter is attached to the circumferential surface of the grinding wheel, the central shaft of the milling cutter is intersected with the circumferential surface of the grinding wheel at a point M, the radius of the grinding wheel passing through the point M forms an included angle beta with the X axis during the upper machining, and the radius of the grinding wheel passing through the point M forms an included angle-beta with the X axis during the lower machining.
2. The fishtail grinding process for the PCB milling cutter as claimed in claim 1, wherein the fishtail grinding process comprises the following steps: the included angle of the fishtail type double edges of the milling cutter is alpha, and beta is (180-alpha)/2.
3. The fishtail grinding process for the PCB milling cutter as claimed in claim 2, wherein the fishtail grinding process comprises the following steps: the alpha is 100-170 degrees.
4. The fishtail grinding process for the PCB milling cutter as claimed in claim 1, wherein the fishtail grinding process comprises the following steps: the milling cutter is fed from the X-axis direction, and during grinding, a surface to be ground with the edge surface of the milling cutter blade exceeding 1/2 is adhered to the circumferential surface of the grinding wheel when viewed from the X-axis direction, namely, the grinding wheel performs over-cut grinding on the end surface of the milling cutter.
5. The PCB milling cutter fish tail grinding process according to claim 4, wherein the grinding process comprises the following steps: the clearance between two cutting edges of the milling cutter is L, and the over-cutting width of the grinding wheel to the first cutting edge and the second cutting edge of the milling cutter is 0.5L.
6. The fishtail grinding process for the PCB milling cutter as claimed in claim 5, wherein the fishtail grinding process comprises the following steps: and the L is 0.05 mm-1.0 mm.
7. The fishtail grinding process for the PCB milling cutter as claimed in claim 1, wherein the fishtail grinding process comprises the following steps: the fishtail type double-edge milling cutter manufactured by adopting the upper processing method comprises the following steps:
a1, attaching a surface to be ground, of which the end face of the edge part of the milling cutter exceeds 1/2, to the circumferential surface of a grinding wheel, grinding the end face of the milling cutter by adopting the inner side of the circumferential surface of the grinding wheel, intersecting the central axis of the milling cutter and the circumferential surface of the grinding wheel at a point M, forming an included angle beta between the radius of the grinding wheel passing through the point M and the X axis, and feeding the milling cutter along the X axis until the first edge of the milling cutter is ground;
and A2, rotating the milling cutter by 180 degrees along the central axis of the milling cutter, completely attaching the end faces to be ground of the milling cutter in the step A1 to the inner side of the circumferential surface of the grinding wheel, feeding the milling cutter along the X-axis direction until the second edge of the milling cutter is ground, wherein the ground area of the end face of the edge part of the milling cutter is larger than the whole area of the end face of the milling cutter of 1/2.
8. The fishtail grinding process for the PCB milling cutter as claimed in claim 1, wherein the fishtail grinding process comprises the following steps: the fishtail type double-edge milling cutter manufactured by adopting the lower machining comprises the following steps:
b1, attaching the surface to be ground, of which the end face exceeds 1/2, of the edge part of the milling cutter to the circumferential surface of the grinding wheel, grinding the end face of the milling cutter by adopting the outer side of the circumferential surface of the grinding wheel, intersecting the central shaft of the milling cutter and the circumferential surface of the grinding wheel at a point M, forming an included angle-beta between the radius of the grinding wheel passing through the point M and the X axis, and feeding the milling cutter along the X axis until the first edge of the milling cutter is ground;
and B2, rotating the milling cutter by 180 degrees along the central axis of the milling cutter, completely attaching the end face to be ground of the milling cutter in the step B1 to the outer side of the circumferential surface of the grinding wheel, feeding the milling cutter along the X-axis direction until the second edge of the milling cutter is ground, wherein the ground area of the end face of the edge part of the milling cutter is larger than the whole area of the end face of the milling cutter of 1/2.
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| JP4489255B2 (en) * | 2000-06-30 | 2010-06-23 | 中村留精密工業株式会社 | Turret lathe hobbing unit |
| CN101318303B (en) * | 2008-03-11 | 2011-05-04 | 贵州大学 | Abrasive machining method for ball end mill and four-shaft linkage equipment for abrasive machining |
| CN203779237U (en) * | 2014-04-24 | 2014-08-20 | 台州美日机床有限公司 | Milling cutter clearance angle grinding base |
| CN105081479B (en) * | 2015-09-08 | 2016-08-24 | 盐城秦川华兴机床有限公司 | A kind of efficient numerically controlled gear grinding machines realizing many point grinding and automatic centering |
| CN105382637B (en) * | 2015-11-06 | 2018-04-10 | 哈尔滨东安利峰刀具有限公司 | A kind of grinding process of milling cutter anterior angle |
| CN107552852B (en) * | 2017-10-16 | 2019-06-28 | 北京理工大学 | A kind of fine rose cutter and sharpening preparation process |
| CN107813116A (en) * | 2017-11-24 | 2018-03-20 | 芜湖保泰精密工具制造有限公司 | A kind of full PCD milling cutters processing technology of land |
| CN207807276U (en) * | 2018-01-19 | 2018-09-04 | 东莞市梵宇自动化科技有限公司 | A kind of PCB milling cutters fish tail cutting mechanism |
| CN208128643U (en) * | 2018-04-26 | 2018-11-20 | 昆山易时腾合金工具有限公司 | A kind of full-automatic milling cutter fish tail cutting machine |
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Denomination of invention: A fishtail grinding process for PCB milling cutters Effective date of registration: 20230821 Granted publication date: 20200922 Pledgee: Xiamen Bank Co.,Ltd. Pledgor: XIAMEN HONGLU LIANCHUANG TOOLS Co.,Ltd. Registration number: Y2023980053009 |