CN218775752U - PCB milling cutter and grinding wheel structure for processing - Google Patents
PCB milling cutter and grinding wheel structure for processing Download PDFInfo
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- CN218775752U CN218775752U CN202222815324.3U CN202222815324U CN218775752U CN 218775752 U CN218775752 U CN 218775752U CN 202222815324 U CN202222815324 U CN 202222815324U CN 218775752 U CN218775752 U CN 218775752U
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Abstract
The utility model provides a PCB milling cutter and a grinding wheel structure for processing, which comprises a handle part, wherein the front end of the handle part is provided with a cutting part through a neck, and the head part of the cutting 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 cutter chip breaking groove structure, 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-end PCB (printed circuit board) with high TG (glass transition temperature), halogen free and the like 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 utility model belongs to the technical field of PCB cutter and PCB cutter shaping, concretely relates to emery wheel structure is used in PCB milling cutter and processing.
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 achieved, the stress direction of the cutting edge is transverse, the PCB cutter is designed to focus on chip removal performance, board edge quality and service life, and the PCB cutter is an indispensable consumable material in the PCB production process.
At present, the types of PCB milling cutters mainly used at home and abroad are dense-tooth milling cutters and rhombic milling cutters, the dense-tooth milling cutters are designed to be of a double-dextrorotation structure and generally have 4-8 cutting edges and chip removal grooves and 1 chip breaking groove, wherein the cutting edges determine the cutting capacity of the cutters and the quality condition of PCB (printed circuit board) edges, the chip removal grooves determine the chip removal capacity of the cutters, and the chip breaking grooves determine the chip breaking capacity and the auxiliary chip removal capacity 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 capabilities 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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a PCB milling cutter and emery wheel structure for processing improves the chip removal performance and rigidity of cutter through designing new cutter chip breaking groove structure, thereby solves the problem that cutter temperature is higher and rapid wear is caused or cutter failure is caused by too large stress and not enough rigidity and premature fracture because of unsmooth chip removal in the rapid cutting process of high-end PCB boards such as 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 realize the technical characteristics, the purpose of the utility model is realized as follows: a PCB milling cutter comprises a handle part, wherein the front end of the handle part is provided with a cutting part through a neck, and the head part of the cutting 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 which 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 grinding wheel structure of the PCB milling cutter comprises a chip removal groove grinding wheel for machining a chip removal groove and a chip breaking groove grinding wheel for machining a streamline chip breaking groove;
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 transition 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 greater than or equal to 10 degrees and less than or equal to 20 degrees, and the angle B of the auxiliary grinding surface is greater than or equal to 30 degrees and less than or equal to 50 degrees;
and when the chip removal groove is ground, the clamping angle theta of the chip removal groove grinding wheel is not less than 20 degrees and not more than 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 streamline 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 utility model discloses there is following beneficial effect:
1. compared with the prior art, the utility model adopts a multi-spiral blade structure and is matched with the streamline chip breaking groove shape, 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 capacity 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. The utility model discloses streamlined design is current straight cell type design relatively, and it is bigger to hold the bits space, and the radiating effect is better, to sum up the utility model of this application of design can effectively improve the life and the chip removal effect of cutter, and does not influence the quality of work piece.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of the blade structure 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
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1-2, a PCB milling cutter is provided, which comprises a handle 4, wherein the front end of the handle 4 is provided with a blade 1 through a neck 3, and the head of the blade 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. Streamlined design is current straight flute type design relatively, and it is bigger to hold the bits space, and the radiating effect is better, to sum up the design utility model of this application can effectively improve the life and the chip removal effect of cutter, and does not influence the quality of work piece.
Referring to fig. 3, compared to the prior art, the chip breaking groove of the prior art is linear as shown in fig. 3, and an included angle η between the chip breaking groove and the cutting edge is an acute angle, so that the edge is prone to breaking and failure due to stress concentration near the angle η by a transverse shearing force during the cutting process. The utility model discloses design into streamlined as shown in figure 2 with cutting part chip breaking slot, contained angle alpha between its chip breaking slot and the smear metal sword, contained angle beta are the obtuse angle, make its atress dispersion in the cutting process, be difficult to the rupture. 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 utility model discloses a cutting part chip breaking slot is streamlined, does benefit to the discharge of smear metal and the actual volume of streamlined chip breaking slot also more the straight line type big, so can provide more spaces of holding the bits for the heat dispersion of cutter is better, and the wearability is stronger, thereby provides higher life.
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 utility model 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 grinding wheel structure of the pcb milling cutter is ground into a multi-spiral structure by using two diamond grinding wheels, 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 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.
Further, the included angle C between the first-time grinding surface 13 and the vertical surface is between 20 and 70 degrees, and the included angle D between the second-time grinding surface 14 and the vertical surface is between 20 and 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, a chip removal groove grinding wheel 8 is arranged, the clamping angle is 20 degrees, a main grinding surface 10 is 15 degrees, an auxiliary grinding surface 11 is a 45-degree surface, and 7 chips are ground by 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 cutting speed =12mm/s, the processed board is TG170, the halogen-free PCB substrate is 1.6mm in thickness and 4 pieces/stack, and the actual service life is prolonged by 15% compared with the service life of the existing dense-tooth-type design cutter. Compared with the existing diamond tooth type design, the service life is prolonged by 26%.
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 less than or equal to 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 grinding wheel structure for processing the PCB milling cutter according to any one of claims 1 to 7, wherein:
comprises a chip removal groove grinding wheel (8) used for processing a chip removal groove (5) and a chip breaking groove grinding wheel (9) used for processing 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) positioned in the middle, and a first grinding surface (13) and a second grinding surface (14) which are positioned on two sides of the 0-degree grinding surface (12).
9. The grinding wheel structure of a 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 grinding wheel structure of a 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 |
|---|---|---|---|
| CN202222815324.3U CN218775752U (en) | 2022-10-25 | 2022-10-25 | PCB milling cutter and grinding wheel structure for processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222815324.3U CN218775752U (en) | 2022-10-25 | 2022-10-25 | PCB milling cutter and grinding wheel structure for processing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218775752U true CN218775752U (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222815324.3U Active CN218775752U (en) | 2022-10-25 | 2022-10-25 | PCB milling cutter and grinding wheel structure for processing |
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| CN (1) | CN218775752U (en) |
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- 2022-10-25 CN CN202222815324.3U patent/CN218775752U/en active Active
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