CN205129013U - A carbide chip dividing groove centre drill for PCB - Google Patents
A carbide chip dividing groove centre drill for PCB Download PDFInfo
- Publication number
- CN205129013U CN205129013U CN201520865399.XU CN201520865399U CN205129013U CN 205129013 U CN205129013 U CN 205129013U CN 201520865399 U CN201520865399 U CN 201520865399U CN 205129013 U CN205129013 U CN 205129013U
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- CN
- China
- Prior art keywords
- pcb
- dividing groove
- chip dividing
- centre drill
- drill bit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model relates to a PCB's central drill bit especially relates to a carbide center drill bit that is used for PCB. A carbide chip dividing groove centre drill for PCB, it includes carbide integrated into one piece's drillstock and drill bit, the first relief angle of drill bit is 15 the chip dividing groove has been seted up to the outside of cutting part. The utility model discloses can effectively guarantee the quality of driling, the pore wall smoothness is high.
Description
Technical field
The utility model relates to the center bit for PCB, particularly relates to a kind of carbide alloy center bit for PCB.
Background technology
Along with the development of telecommunications industry, the demand of pcb board explodes, and in order to fixing pcb board or install some device, needs to hole on pcb board.It is not treated, thicker that traditional product is generally hilted broadsword face design chisel edge, and chisel edge directly affects axial force again in process.Chisel edge is responsible for the cutwork of the core in hole.Due to the negative rake that chisel edge anterior angle is very large, so chisel edge serious extruding occurs and causes very large axial force during drilling, account for 60 ~ 70% of total axial force, this causes drilling quality not high, and especially the fineness of hole wall is difficult to meet the demands.
Summary of the invention
The utility model is intended to the defect overcoming prior art, provides a kind of carbide alloy chip dividing groove centre drill for PCB.The utility model effectively can ensure drilling quality, and hole wall smoothness is high.
In order to solve the problems of the technologies described above, a kind of carbide alloy chip dividing groove centre drill for PCB, it comprises the integrated drillstock of carbide alloy and blade, and the first relief angle of described blade is 15 °, the main cutting edge of described blade offers chip dividing groove.
The described hard chip dividing groove centre drill for PCB, second relief angle 30 ° of described blade, helical angle 30 °, drift angle 128 °-132 °.
The described hard chip dividing groove centre drill for PCB, this centre drill is the drill bit of double-pole face design, and its diameter is 1.3-3.175mm.
The utility model adopts carbide alloy to be base material, and web thinning can reduce this part axial force suffered in process, namely have adjusted the first relief angle, make centre drill sharper, meanwhile, in drill bit two helicla flutes, lip surface place grinds two chip dividing grooves, and chip width can be made to reduce, be conducive to chip removal, improve and twine a phenomenon.Therefore, centre drill of the present utility model is specially adapted to processing HDI plate, halogen-free plate and high TG plate.
Accompanying drawing explanation
Below, by reference to the accompanying drawings the utility model is further described:
Fig. 1 is schematic diagram of the present utility model;
Fig. 2 is Z-direction partial enlarged drawing in Fig. 1;
Fig. 3 be in Fig. 1 K to partial enlarged drawing.
Detailed description of the invention
As shown in Figure 1, Figure 2 and Figure 3, a kind of carbide alloy chip dividing groove centre drill for PCB of the utility model, it comprises the integrated drillstock 1 of carbide alloy and blade 2, and the first relief angle of described blade is 15 °, the main cutting edge of described blade offers chip dividing groove.Open chip dividing groove 3 at main cutting edge, chip width can be made to reduce, be conducive to chip removal, alleviate the heating problem in boring procedure.Thus improve drill bit working (machining) efficiency, improve and twine a phenomenon, improve hole wall fineness.
The described hard chip dividing groove centre drill for PCB, second relief angle 30 ° of described blade, helical angle 30 °, drift angle 128 °-132 °.
The described hard chip dividing groove centre drill for PCB, this centre drill is the drill bit of double-pole face design, and its diameter d is 1.3-3.175mm.
Claims (3)
1. for a carbide alloy chip dividing groove centre drill of PCB, it comprises the integrated drillstock of carbide alloy and blade, it is characterized in that, the first relief angle of described blade is 15 °, the main cutting edge of described blade offers chip dividing groove.
2. the carbide alloy chip dividing groove centre drill for PCB according to claim 1, is characterized in that, second relief angle 30 ° of described blade, helical angle 30 °, drift angle 128 °-132 °.
3. the carbide alloy chip dividing groove centre drill for PCB according to claim 1, is characterized in that, this centre drill is the drill bit of double-pole face design, and its diameter is 1.3-3.175mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520865399.XU CN205129013U (en) | 2015-11-02 | 2015-11-02 | A carbide chip dividing groove centre drill for PCB |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520865399.XU CN205129013U (en) | 2015-11-02 | 2015-11-02 | A carbide chip dividing groove centre drill for PCB |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205129013U true CN205129013U (en) | 2016-04-06 |
Family
ID=55614838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520865399.XU Active CN205129013U (en) | 2015-11-02 | 2015-11-02 | A carbide chip dividing groove centre drill for PCB |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205129013U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106513791A (en) * | 2016-12-30 | 2017-03-22 | 太仓韬信信息科技有限公司 | Twist drill for machining stainless steel |
| CN110605425A (en) * | 2018-06-15 | 2019-12-24 | 上海惠而顺精密工具股份有限公司 | Hard alloy printed circuit board candle drill |
-
2015
- 2015-11-02 CN CN201520865399.XU patent/CN205129013U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106513791A (en) * | 2016-12-30 | 2017-03-22 | 太仓韬信信息科技有限公司 | Twist drill for machining stainless steel |
| CN110605425A (en) * | 2018-06-15 | 2019-12-24 | 上海惠而顺精密工具股份有限公司 | Hard alloy printed circuit board candle drill |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |