CN115837486A - PCB milling cutter and groove processing method - Google Patents
PCB milling cutter and groove processing method Download PDFInfo
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- CN115837486A CN115837486A CN202211310461.XA CN202211310461A CN115837486A CN 115837486 A CN115837486 A CN 115837486A CN 202211310461 A CN202211310461 A CN 202211310461A CN 115837486 A CN115837486 A CN 115837486A
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- 238000003801 milling Methods 0.000 title claims abstract description 35
- 238000003672 processing method Methods 0.000 title claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 35
- 238000003754 machining Methods 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims description 96
- 230000007704 transition Effects 0.000 claims description 13
- 229910003460 diamond Inorganic materials 0.000 claims description 9
- 239000010432 diamond Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 230000001788 irregular Effects 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 abstract description 4
- 230000002028 premature Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 7
- 230000002035 prolonged effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention provides a PCB milling cutter and a groove processing method, comprising a handle part, wherein the front end of the handle part is provided with a blade part through a neck, and the head part of the blade part is provided with a cutter point; the cutting part comprises a chip removal groove, a cutting edge and a streamline chip breaking groove. The chip removal performance and rigidity of the cutter are improved by designing a new chip removal groove structure of the cutter, so that the problems of high cutter temperature and rapid abrasion caused by unsmooth chip removal or cutter failure caused by premature fracture due to overlarge stress and insufficient rigidity in the rapid cutting process of high-TG, halogen-free and other high-end PCB boards are solved; by adopting a multi-spiral blade part structure and matching with the shape of a streamline chip breaking groove, the stress of the cutter in the machining process is distributed, and the fracture failure of the cutter caused by stress concentration is reduced. The heat dissipation performance and the auxiliary chip removal capability of the cutter are enhanced, so that the cutter is more wear-resistant and has a longer service life.
Description
Technical Field
The invention belongs to the technical field of PCB cutters and PCB cutter forming, and particularly relates to a PCB milling cutter and a groove processing method.
Background
The PCB special milling cutter, called PCB milling cutter for short, also called gong cutter, is used for the post-process of PCB production, namely the forming process, and mainly aims to divide the manufactured PCB into required shapes, and the PCB cutter is used for high-speed rotary milling of the cutter. The PCB cutter mainly has the advantages that cutting is carried out, the stress direction of the cutting edge is transverse, the PCB milling cutter is designed to pay more attention to chip removal performance, board edge quality and service life, and the PCB milling cutter is an indispensable consumable material in the PCB production process.
At present, the PCB milling cutters mainly used at home and abroad are dense-tooth milling cutters and diamond milling cutters, the dense-tooth milling cutters are designed to be of a double-right-handed structure, namely 4-8 cutting edges and chip removal grooves, and 1 chip breaking groove, wherein the cutting edges determine the cutting capability of the cutters and the quality condition of the PCB, the chip removal grooves determine the chip removal capability of the cutters, and the chip breaking grooves determine the chip breaking capability and the auxiliary chip removal capability of the cutters. The cutting edge, the chip removal groove and the chip breaking groove jointly determine the service life of the cutter. The rhombus milling cutter is similar to a rhombus in appearance of a tooth profile on a cutting edge as the name implies, is of a left-right rotating structure, is provided with cutting edges and chip removal grooves in a right-rotating manner, has 4 to 8 edges and mainly has the functions of cutting and chip removal. The number of the left-handed threads is 1 to 7 less than that of the right-handed threads, and the main function is chip breaking.
With the rapid development of 5G communication, high-frequency and high-speed PCB electronic circuit boards are more applied, and the filling material for the PCB substrate becomes more complex. Conventional dense-tooth milling cutters and diamond milling cutters have limited chip removal capability due to stress concentration caused by the existing structural characteristic design, which leads to a continuous reduction in the service life of such plates in applications.
Disclosure of Invention
The invention aims to provide a PCB milling cutter and a groove processing method, which improve the chip removal performance and rigidity of a cutter by designing a new chip removal groove structure of the cutter, thereby solving the problems of high cutter temperature and rapid abrasion caused by unsmooth chip removal or cutter failure caused by overlarge stress and premature fracture caused by insufficient rigidity in the rapid cutting process of high-end PCB with high TG, no halogen and the like; by adopting a multi-spiral blade part structure and matching with the shape of a streamline chip breaking groove, the stress of the cutter in the machining process is distributed, and the fracture failure of the cutter caused by stress concentration is reduced. The heat dissipation performance and the auxiliary chip removal capability of the cutter are enhanced, so that the cutter is more wear-resistant and has a longer service life.
In order to achieve the technical features, the invention is realized as follows: a PCB milling cutter comprises a handle part, wherein the front end of the handle part is provided with a blade part through a neck, and the head part of the blade part is provided with a cutter point; the cutting part comprises a chip removal groove, a cutting edge and a streamline chip breaking groove.
The included angles alpha and beta between the cutting edge and the tangent lines at the two sides of the streamline chip breaking groove are obtuse angles and are not more than 130 degrees.
The streamline chip breaking groove is in a semicircular shape, an arc shape, an oval shape or an irregular streamline shape.
The chip removal groove and the streamline chip breaking groove of the blade part both adopt a multi-spiral structure;
the multi-helix structure includes, but is not limited to, a double right-helix structure, a double left-helix structure, or a left-right helix structure.
The diameter of the blade part is 0.3mm-3.175mm.
The neck is used for transitionally connecting the handle part and the blade part, and the angle of the neck is 7-20 degrees.
The diameter of the handle part is 3.150mm-3.180mm.
The groove processing method of the PCB milling cutter adopts two diamond grinding wheels to grind a multi-spiral structure respectively;
the two diamond grinding wheels comprise chip removal groove grinding wheels for machining chip removal grooves and chip breaking groove grinding wheels for machining streamline chip breaking grooves;
the grinding surface of the chip removal groove grinding wheel comprises a main grinding surface and an auxiliary grinding surface which are arranged in a transitional mode;
the grinding surface of the chip breaking groove grinding wheel comprises a 0-degree grinding surface positioned in the middle, and a first grinding surface and a second grinding surface which are positioned on two sides of the 0-degree grinding surface.
The angle A of the main grinding surface is more than or equal to 10 degrees and less than or equal to 20 degrees, and the angle B of the auxiliary grinding surface is more than or equal to 30 degrees and less than or equal to 50 degrees;
and when the chip removal groove grinding is carried out, the clamping angle theta of the chip removal groove grinding wheel is more than or equal to 20 degrees and less than or equal to 35 degrees.
The included angle C between the first grinding surface and the vertical surface is more than or equal to 20 degrees and less than or equal to 70 degrees, and the included angle D between the second grinding surface and the vertical surface is more than or equal to 20 degrees and less than or equal to 70 degrees;
the 0-degree grinding surface is in transition connection with the transition positions of the first grinding surface and the second grinding surface by adopting an arc transition grinding surface;
and when the streamlined chip breaking groove grinding is carried out, the clamping angle delta of the chip breaking groove grinding wheel is more than or equal to 20 degrees and less than or equal to 85 degrees.
The invention has the following beneficial effects:
1. compared with the prior art, the invention adopts a multi-spiral blade part structure and is matched with the shape of a streamline chip breaking groove, so that the stress in the processing process can be effectively dispersed, the rigidity of the cutter is improved, and the chip containing space and the chip removal assisting capability are increased; the included angles alpha and beta between the cutting edge and the tangent lines at the two sides of the streamline chip breaking groove are obtuse angles, so that the cutting capability and the wear resistance can be effectively improved.
2. Compared with the conventional straight groove type design, the streamline design has the advantages that the chip containing space is larger, the heat dissipation effect is better, the service life of the cutter and the chip removal effect can be effectively prolonged, and the quality of a machined workpiece is not influenced.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of the structure of the blade of the present invention.
Fig. 3 is a schematic view of a prior art blade structure.
Fig. 4 is a schematic view of clamping the chip removal groove grinding wheel.
Fig. 5 is a schematic view of the shape of the chip removal groove grinding wheel.
FIG. 6 is a schematic view of the chip breaking groove grinding wheel clamping.
FIG. 7 is a schematic view of the shape of the chip-breaking groove grinding wheel.
Wherein: the cutting edge part 1, the tool nose 2, the neck 3, the handle part 4, the chip removal groove 5, the cutting edge 6 and the streamline chip breaking groove 7;
the grinding wheel comprises a chip removal groove grinding wheel 8, a chip breaking groove grinding wheel 9, a main grinding surface 10, an auxiliary grinding surface 11, a 0-degree grinding surface 12, a first grinding surface 13, a second grinding surface 14 and an arc transition grinding surface 15.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1-2, a PCB milling cutter is shown, which comprises a handle 4, wherein the front end of the handle 4 is provided with a cutting part 1 through a neck 3, and the head of the cutting part 1 is provided with a tool nose 2; the blade part 1 comprises a chip removal groove 5, a cutting edge 6 and a streamline chip breaking groove 7. The included angles alpha and beta between the cutting edge 6 and the tangent lines at the two sides of the streamline chip-breaking groove 7 are obtuse angles and are not more than 130 degrees. By adopting the cutting edge 6 and the streamline chip breaking groove 7 and matching the included angles alpha and beta to form an obtuse angle, the cutting capability and the wear resistance can be effectively improved. Compared with the conventional straight groove type design, the streamline design has the advantages that the chip containing space is larger, the heat dissipation effect is better, the service life of the cutter and the chip removal effect can be effectively prolonged by designing the streamline design, and the quality of a machined workpiece is not influenced.
Referring to fig. 3, compared to the prior art, the chip breaking groove of the edge part of the prior art is linear as shown in fig. 3, an included angle η between the chip breaking groove and the cutting edge is an acute angle, and the edge part is subjected to a transverse shear force during a cutting process, so that stress concentration is easily generated near the angle η to cause the edge part to break and fail. The chip breaking groove on the edge part is designed to be streamline as shown in figure 2, and the included angle alpha between the chip breaking groove and the chip cutting edge is an obtuse angle, so that the chip breaking groove is dispersed in stress and is not easy to break in the cutting process. The linear chip breaking groove structure in the prior art can lead to chips to be accumulated and not easy to discharge, so that the groove is blocked, the chip containing space is reduced, the heating is intensified in the use process of the cutter, and the abrasion is accelerated and fails in advance. The blade chip breaking groove is streamline, chip can be discharged conveniently, the actual volume of the streamline chip breaking groove is larger than that of a straight line, more chip containing spaces can be provided, the heat dissipation performance of the cutter is better, the abrasion resistance is stronger, and the service life is longer.
Further, the streamline chip breaking groove 7 is in a semicircular shape, an arc shape, an oval shape or an irregular streamline shape. By adopting the streamline form, the stress concentration is effectively reduced, and the chip removal efficiency is effectively improved. Streamline in various different structural forms is adopted, and flexibility of structure selection is enhanced.
Further, the chip removal groove 5 and the streamline chip breaking groove 7 of the blade part 1 both adopt a multi-spiral structure. The stress in the machining process can be effectively dispersed by adopting a multi-spiral structure to be better matched with the streamline chip breaking groove 7, the rigidity of the cutter is improved, and the chip containing space and the chip removal assisting capability are increased.
Further, the multi-helix structure includes, but is not limited to, a double right-helix structure, a double left-helix structure, or a left-right helix structure. The adaptability of the device is enhanced by selecting various different structures.
Further, the diameter of the blade part 1 is 0.3mm-3.175mm. By adopting the size of the blade part 1, the processing of PCBs of different models can be adapted.
Furthermore, the neck 3 is used for transitionally connecting the handle part 4 and the blade part 1, and the angle of the neck is 7-20 degrees. The optimal connection strength between the two is ensured by adopting the transition angle.
Further, the diameter of the handle part 4 is 3.150mm-3.180mm. The adaptability of the handle 4 is enhanced by the dimensions thereof described above.
Example 2:
referring to fig. 4-7, the groove processing method of the pcb milling cutter adopts two diamond grinding wheels to grind and edge respectively; the two diamond grinding wheels comprise a chip removal groove grinding wheel 8 for processing the chip removal groove 5 and a chip breaking groove grinding wheel 9 for processing the streamline chip breaking groove 7; the grinding surface of the chip removal groove grinding wheel 8 comprises a main grinding surface 10 and an auxiliary grinding surface 11 which are arranged in a transition mode; the grinding surface of the chip breaking groove grinding wheel 9 comprises a 0-degree grinding surface 12 positioned in the middle, and a first secondary grinding surface 13 and a second secondary grinding surface 14 positioned on two sides of the 0-degree grinding surface 12. By adopting the processing method, the chip removal groove 5 and the streamline chip breaking groove 7 can be processed, so that the processing quality of the PCB milling cutter is ensured.
Further, the angle A of the main grinding surface 10 is between 10 and 20 degrees, and the angle B of the auxiliary grinding surface 11 is between 30 and 50 degrees; and when the chip removal groove 5 is ground, the clamping angle theta of the chip removal groove grinding wheel 8 is more than or equal to 20 degrees and less than or equal to 35 degrees.
Further, the included angle C between the first grinding surface 13 and the vertical surface is greater than or equal to 20 degrees and less than or equal to 70 degrees, and the included angle D between the second grinding surface 14 and the vertical surface is greater than or equal to 20 degrees and less than or equal to 70 degrees; the transition part of the 0-degree grinding surface 12, the first grinding surface 13 and the second grinding surface 14 is in transition connection by adopting an arc transition grinding surface 15; and when the streamline chip breaking groove 7 is ground, the clamping angle delta of the chip breaking groove grinding wheel 9 is more than or equal to 20 degrees and less than or equal to 85 degrees.
Example 3:
taking milling cutter processing with the diameter of 1.8mm and the blade length of 9.5mm as an example, arranging a chip removal groove grinding wheel 8 with the clamping angle of 20 degrees, a main grinding surface 10 of 15 degrees, an auxiliary grinding surface 11 of 45 degrees, and grinding 7 chips in the chip removal groove; the included angle between the chip breaking groove grinding wheel 9 and a horizontal vertical plane is 82 degrees, the shape of the grinding wheel is 0 degree, the first grinding surface is +55 degrees, the second grinding surface is-55 degrees, the included angle between the 0 degree surface and the two secondary grinding surfaces needs to be ground into a circular arc shape, and the included angles between the tangent lines at two sides of the machined streamline chip breaking groove and the cutting edge are alpha =130 degrees and beta =110 degrees. And then, testing the actual case by using a forming machine, wherein the processing parameters are as follows: the rotating speed =30Krpm, the line tool speed =12mm/s, the processed sheet material is TG170, a halogen-free PCB substrate is 1.6mm in thickness, 4 sheets/stack, and the actual service life is prolonged by 15% compared with the service life of the existing dense-tooth-type design tool. Compared with the prior diamond tooth type design, the service life is prolonged by 26 percent.
Through actual measurement and certification, the service life of the cutter of the PCB milling cutter produced by the processing method of the PCB milling cutter groove is prolonged by more than 15% in the rapid cutting process of high-end PCB plates with high TG, no halogen and the like.
Claims (10)
1. A PCB milling cutter comprises a handle part (4), wherein the front end of the handle part (4) is provided with a blade part (1) through a neck (3), and the head part of the blade part (1) is provided with a cutter point (2);
the method is characterized in that: the cutting part (1) comprises a chip removal groove (5), a cutting edge (6) and a streamline chip breaking groove (7).
2. The PCB milling cutter according to claim 1, wherein: the included angles alpha and beta between the cutting edge (6) and the tangent lines at the two sides of the streamline chip breaking groove (7) are obtuse angles and are not more than 130 degrees.
3. The PCB milling cutter according to claim 2, wherein: the streamline chip breaking groove (7) is in a semicircular shape, an arc shape, an ellipse shape or an irregular streamline shape.
4. The PCB milling cutter according to claim 1, wherein: the chip removal groove (5) and the streamline chip breaking groove (7) of the blade part (1) both adopt a multi-spiral structure;
the multi-helix structure includes, but is not limited to, a double right-helix structure, a double left-helix structure, or a left-right helix structure.
5. The PCB milling cutter according to claim 1, wherein: the diameter of the blade part (1) is 0.3mm-3.175mm.
6. The PCB milling cutter according to claim 1, wherein: the neck (3) is used for transitionally connecting the handle part (4) and the blade part (1), and the angle of the neck (3) is 7-20 degrees.
7. The PCB milling cutter according to claim 1, wherein: the diameter of the handle part (4) is 3.150mm-3.180mm.
8. The groove processing method of the PCB milling cutter according to any one of claims 1 to 7, wherein a multi-spiral structure is ground by using two diamond grinding wheels, respectively;
the two diamond grinding wheels comprise a chip removal groove grinding wheel (8) used for machining a chip removal groove (5) and a chip breaking groove grinding wheel (9) used for machining a streamline chip breaking groove (7);
the grinding surface of the chip removal groove grinding wheel (8) comprises a main grinding surface (10) and an auxiliary grinding surface (11) which are arranged in a transition mode;
the grinding surface of the chip breaking groove grinding wheel (9) comprises a 0-degree grinding surface (12) located in the middle, and a first grinding surface (13) and a second grinding surface (14) located on two sides of the 0-degree grinding surface (12).
9. The groove processing method of the PCB milling cutter according to claim 8, wherein: the angle A of the main grinding surface (10) is greater than or equal to 10 degrees and less than or equal to 20 degrees, and the angle B of the auxiliary grinding surface (11) is greater than or equal to 30 degrees and less than or equal to 50 degrees;
and when the chip removal groove (5) is ground, the clamping angle theta of the chip removal groove grinding wheel (8) is more than or equal to 20 degrees and less than or equal to 35 degrees.
10. The groove processing method of the PCB milling cutter according to claim 8, wherein: the included angle C between the first grinding surface (13) and the vertical surface is more than or equal to 20 degrees and less than or equal to 70 degrees, and the included angle D between the second grinding surface (14) and the vertical surface is more than or equal to 20 degrees and less than or equal to 70 degrees;
the 0-degree grinding surface (12) is in transition connection with the transition parts of the first grinding surface (13) and the second grinding surface (14) by adopting an arc transition grinding surface (15);
and when the streamline chip breaking groove (7) is ground, the clamping angle delta of the chip breaking groove grinding wheel (9) is more than or equal to 20 degrees and less than or equal to 85 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211310461.XA CN115837486A (en) | 2022-10-25 | 2022-10-25 | PCB milling cutter and groove processing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211310461.XA CN115837486A (en) | 2022-10-25 | 2022-10-25 | PCB milling cutter and groove processing method |
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| CN115837486A true CN115837486A (en) | 2023-03-24 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101683698A (en) * | 2009-08-18 | 2010-03-31 | 深圳市金洲精工科技股份有限公司 | Milling cutter for forming circuit board and processing method thereof |
| CN106064250A (en) * | 2015-04-22 | 2016-11-02 | 肯纳金属公司 | Strengthen chip instrument and the manufacture method thereof of chip removal ability |
| CN110052654A (en) * | 2019-04-25 | 2019-07-26 | 厦门鸿鹭联创工具有限公司 | The design method of chip breaking type milling cutter |
| CN111390258A (en) * | 2020-04-26 | 2020-07-10 | 深圳市金洲精工科技股份有限公司 | Milling cutter |
| CN215315938U (en) * | 2021-04-20 | 2021-12-28 | 厦门鸿鹭联创工具有限公司 | Chip breaking type PCB single-rotation cutter |
| US20220055126A1 (en) * | 2019-04-12 | 2022-02-24 | Hptec Gmbh | Milling tool for milling workpieces |
| CN217142462U (en) * | 2022-03-08 | 2022-08-09 | 宜昌永鑫精工科技股份有限公司 | PCB milling cutter of high chip removal performance |
| CN218775752U (en) * | 2022-10-25 | 2023-03-31 | 宜昌永鑫精工科技股份有限公司 | PCB milling cutter and grinding wheel structure for processing |
-
2022
- 2022-10-25 CN CN202211310461.XA patent/CN115837486A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101683698A (en) * | 2009-08-18 | 2010-03-31 | 深圳市金洲精工科技股份有限公司 | Milling cutter for forming circuit board and processing method thereof |
| CN106064250A (en) * | 2015-04-22 | 2016-11-02 | 肯纳金属公司 | Strengthen chip instrument and the manufacture method thereof of chip removal ability |
| US20220055126A1 (en) * | 2019-04-12 | 2022-02-24 | Hptec Gmbh | Milling tool for milling workpieces |
| CN110052654A (en) * | 2019-04-25 | 2019-07-26 | 厦门鸿鹭联创工具有限公司 | The design method of chip breaking type milling cutter |
| CN111390258A (en) * | 2020-04-26 | 2020-07-10 | 深圳市金洲精工科技股份有限公司 | Milling cutter |
| CN215315938U (en) * | 2021-04-20 | 2021-12-28 | 厦门鸿鹭联创工具有限公司 | Chip breaking type PCB single-rotation cutter |
| CN217142462U (en) * | 2022-03-08 | 2022-08-09 | 宜昌永鑫精工科技股份有限公司 | PCB milling cutter of high chip removal performance |
| CN218775752U (en) * | 2022-10-25 | 2023-03-31 | 宜昌永鑫精工科技股份有限公司 | PCB milling cutter and grinding wheel structure for processing |
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