CN202219341U - Drill bit with double symmetrical chip separating grooves for printed circuit boards - Google Patents
Drill bit with double symmetrical chip separating grooves for printed circuit boards Download PDFInfo
- Publication number
- CN202219341U CN202219341U CN2011203551879U CN201120355187U CN202219341U CN 202219341 U CN202219341 U CN 202219341U CN 2011203551879 U CN2011203551879 U CN 2011203551879U CN 201120355187 U CN201120355187 U CN 201120355187U CN 202219341 U CN202219341 U CN 202219341U
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- China
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- drill bit
- cutting tip
- printed circuit
- cutting part
- main body
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Abstract
The utility model discloses a drill bit with double symmetrical chip separating grooves for printed circuit boards, which comprises a cutting part (1) and a clamping part (2). The cutting part (1) comprises a polishing chisel edge (11), double chip separating grooves (12) and a cutting part main body (13). The polishing chisel edge (11) is spiral and arranged at the top of the cutting part body (13), the double chip separating grooves (12) are arranged on rear cutter faces of two sides of the cutting part body (13), and an included angle reserved between generatrices of two cutting edges of the drill bit serves as a drill tip angle (14). The cutting part body (13) is provided with a spiral angle (15), and the clamping part (2) is connected onto the rear portion of the cutting part body (13). The drill bit is small in drilling axial force, and load and stress to the drill bit during process are reduced so as to facilitate protection for the drill bit, while processing quality is improved. Quantity of surfaces processed by the drill bit is fine, and roughness of walls of holes processed by the drill bit is low, layering and burrs at orifices are avoided effectively. In addition, the drill bit has fine chip removal performance, and accordingly the problem of twisting of copper foil chips during processing is solved.
Description
Technical field
The utility model is a kind of cut drill, especially relates to the two chip dividing groove drill bits of a kind of printed circuit board (PCB) symmetrical expression, belongs to the renovation technique of the two chip dividing groove drill bits of printed circuit board (PCB) symmetrical expression.
Background technology
Printed circuit board (PCB) (PCB, Printed Circuit Board) is substrate and a crucial cross tie part integrated, the various electronic devices and components of assembling, almost appears in each electronic equipment.Printed circuit board (PCB) is a kind of typically to have anisotropism and each anisotropic material; Its cutting characteristics mainly are: in the printed circuit board (PCB) drilling process drill bit will with different order respectively with metal, nonmetal and macromolecular material effect; And its cutting scheme difference of the material of different performance is obvious, and this will cause the complicated diversity of printed circuit board material cutting scheme.Material removal process can receive the factor affecting such as fibre strength, fibre density, fleece texture direction, metallic conductor thickness and medium thickness of printed circuit board (PCB), thereby the printed circuit board (PCB) drilling technique presents diversity to the bit cutting performance demands.And drilling printed circuit board (PCB) process can not be used cooling fluid.Cause the cutting force in the printed circuit board (PCB) drilling process big, chip removal difficulty, problem such as drill bit is easy to wear, serious restriction the raising of production efficiency.Be accompanied by the enforcement of European Union environmental protection instruction, the environment-friendly type printed circuit board (PCB) extensive use of lead-free compatible and Halogen has strengthened difficulty of processing.
Summary of the invention
The purpose of the utility model is to consider the problems referred to above and provides a kind of cutting force little that chip removal is easy, the two chip dividing groove drill bits of the printed circuit board (PCB) symmetrical expression of long service life.The utility model is reasonable in design, and is convenient and practical.
The technical scheme of the utility model is: the two chip dividing groove drill bits of the printed circuit board (PCB) symmetrical expression of the utility model; Include cutting tip and retained part; Cutting tip comprises web thinning, two chip dividing groove and cutting tip main body, and web thinning is located at the top of cutting tip main body, is shaped as spirality; Two chip dividing grooves are located on the back knife face of cutting tip main body both sides; The angle of drill bit two cutting edge buses is the apex point drift angle, and the cutting tip main body is provided with helical angle, and retained part is connected the rear portion of cutting tip main body.
Above-mentioned retained part be shaped as cylinder.
The set helical angle of above-mentioned cutting tip main body is 10 degree～40 degree.
The apex point drift angle of above-mentioned cutting tip is 120 degree～170 degree.
The length L 1 of above-mentioned cutting tip is 11～13cm, and diameter is 3.2～6.5mm.
The length L of above-mentioned retained part is 25～27mm, and diameter is 3.175mm.
The utility model compared with prior art has the following advantages:
1) drilling axial force is little, the load that the drill bit process is received, and stress reduces, and helps protecting drill bit, has improved crudy simultaneously.
2) machined surface quality, Hole Wall Roughness is little, effectively avoids the generation of layering and aperture burr.
3) the drill bit chip removal is functional, has solved to add the problem that Copper Foil smear metal in man-hour is twined.
The utility model is that a kind of design is ingenious, function admirable, the two chip dividing groove drill bits of convenient and practical printed circuit board (PCB) symmetrical expression.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 be among Fig. 1 A to sketch map.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment 1:
The structural representation of the two chip dividing groove drill bits of the utility model printed circuit board (PCB) symmetrical expression is as shown in Figure 1; Include cutting tip 1 and retained part 2, among Fig. 1 A to structure as shown in Figure 2, cutting tip 1 comprises web thinning 11, two chip dividing groove 12 and cutting tip main body 13; Web thinning 11 is located at the top of cutting tip main body 13; Be shaped as spirality, two chip dividing grooves 12 are located on the back knife face of cutting tip main body 13 both sides, and the angle of drill bit two cutting edge buses is an apex point drift angle 14; Cutting tip main body 13 is provided with helical angle 15, and retained part 2 is connected the rear portion of cutting tip main body 13.
Above-mentioned retained part 2 be shaped as cylinder.
Above-mentioned cutting tip main body 13 set helical angles 15 are 10 degree～40 degree.
The apex point drift angle 14 of above-mentioned cutting tip 1 is 120 degree～170 degree.
The length L 1 of above-mentioned cutting tip 1 is 11～13cm, and diameter is 3.2～6.5mm.
The length L of above-mentioned retained part 2 is 25～27mm, and diameter is 3.175mm.
In the present embodiment, the length L 1 of this cutting tip 1 is 12mm, and diameter is 3.2mm; The apex point drift angle 14 of cutting tip 1 is 155 degree, and cutting tip main body 13 set helical angles 15 are 15 degree, and retained part 2 is connected the rear portion of cutting tip main body 13; Be shaped as cylinder; The length L of retained part 2 is 26.1mm, and diameter is 3.175mm, and the total length of the two chip dividing groove drill bits of printed substrate is 38.1mm.
Embodiment 2:
The structure of the utility model embodiment is identical with embodiment 1; Difference is that the length L 1 of cutting tip 1 is 11mm, and diameter is 5.0mm, and the apex point drift angle 14 of cutting tip 1 is 160 degree; Cutting tip main body 13 set helical angles 15 are 35 degree; The length L of retained part 2 is 25mm, and diameter is 3.175, and the total length of the two chip dividing groove drill bits of printed substrate is 36mm.
Embodiment 3:
The structure of the utility model embodiment is identical with embodiment 1; Difference is that the length L 1 of cutting tip 1 is 13mm, and diameter is 6mm, and the apex point drift angle 14 of cutting tip 1 is 165 degree; Cutting tip main body 13 set helical angles 15 are 30 degree; The length L of retained part 2 is 27mm, and diameter is 3.175, and the total length of the two chip dividing groove drill bits of printed substrate is 40mm.
Use no chip dividing groove drill bit and this pair chip dividing groove drill bit to carry out printed circuit board (PCB) drilling experiment, contrast drilling axial force, cutter life, experimental result is got the mean value of 3 experiments.It is 119.5N that no chip dividing groove bit drills is scabbled equal axial force, and cutter wear of the tool flank width is 0.1mm behind drilling 660 holes.It is 53N that the two chip dividing groove bit drills of symmetrical expression are scabbled equal axial force, and cutter wear of the tool flank width is 0.055mm behind drilling 660 holes.Machining condition is a workpiece material: common FR-4 double face copper, and speed of mainshaft 20k rpm, feed speed is 500 mm/min, DRY CUTTING.
Claims (6)
1. two chip dividing groove drill bits of a printed circuit board (PCB) symmetrical expression; Include cutting tip (1) and retained part (2); It is characterized in that cutting tip (1) comprises web thinning (11), two chip dividing groove (12) and cutting tip main body (13), web thinning (11) is located at the top of cutting tip main body (13), is shaped as spirality; Two chip dividing grooves (12) are located on the back knife face of cutting tip main body (13) both sides; The angle of drill bit two cutting edge buses is apex point drift angle (14), and cutting tip main body (13) is provided with helical angle (15), and retained part (2) is connected the rear portion of cutting tip main body (13).
2. the two chip dividing groove drill bits of printed circuit board (PCB) symmetrical expression according to claim 1 is characterized in that the cylinder that is shaped as of above-mentioned retained part (2).
3. the two chip dividing groove drill bits of printed circuit board (PCB) symmetrical expression according to claim 1 is characterized in that the set helical angle of above-mentioned cutting tip main body (13) (15) is 10 degree～40 degree.
4. the two chip dividing groove drill bits of printed circuit board (PCB) symmetrical expression according to claim 1, the apex point drift angle (14) that it is characterized in that above-mentioned cutting tip (1) are 120 degree～170 degree.
5. the two chip dividing groove drill bits of printed circuit board (PCB) symmetrical expression according to claim 1 is characterized in that the length L 1 of above-mentioned cutting tip (1) is 11～13cm, and diameter is 3.2～6.5mm.
6. the two chip dividing groove drill bits of printed circuit board (PCB) symmetrical expression according to claim 1, the length L that it is characterized in that above-mentioned retained part (2) is 25～27mm, diameter is 3.175mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203551879U CN202219341U (en) | 2011-09-21 | 2011-09-21 | Drill bit with double symmetrical chip separating grooves for printed circuit boards |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203551879U CN202219341U (en) | 2011-09-21 | 2011-09-21 | Drill bit with double symmetrical chip separating grooves for printed circuit boards |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202219341U true CN202219341U (en) | 2012-05-16 |
Family
ID=46041378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203551879U Expired - Lifetime CN202219341U (en) | 2011-09-21 | 2011-09-21 | Drill bit with double symmetrical chip separating grooves for printed circuit boards |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202219341U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350520A (en) * | 2011-09-21 | 2012-02-15 | 广东工业大学 | Printed circuit board symmetrical drill with double chip dividing grooves |
| CN105108211A (en) * | 2015-09-15 | 2015-12-02 | 深圳市金洲精工科技股份有限公司 | Staggered tooth blade drilling bit |
| CN111670079A (en) * | 2018-02-06 | 2020-09-15 | 国立大学法人东海国立大学机构 | Drill and drilling device |
-
2011
- 2011-09-21 CN CN2011203551879U patent/CN202219341U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350520A (en) * | 2011-09-21 | 2012-02-15 | 广东工业大学 | Printed circuit board symmetrical drill with double chip dividing grooves |
| CN105108211A (en) * | 2015-09-15 | 2015-12-02 | 深圳市金洲精工科技股份有限公司 | Staggered tooth blade drilling bit |
| CN111670079A (en) * | 2018-02-06 | 2020-09-15 | 国立大学法人东海国立大学机构 | Drill and drilling device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120516 |