CN217775669U

CN217775669U - Drill bit is used in processing of PCB panel

Info

Publication number: CN217775669U
Application number: CN202221010029.4U
Authority: CN
Inventors: 陈振; 王美其; 李冬果
Original assignee: Shenzhen Yixin Technology Co ltd
Current assignee: Shenzhen Yixin Technology Co ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-11-11
Anticipated expiration: 2032-04-28

Abstract

The utility model provides a drill bit for processing PCB plates, which comprises a drill handle and a drill body, wherein the drill body is provided with a spiral first chip groove and a spiral second chip groove which are arranged in a non-central symmetry way relative to the rotation center of the drill bit, and a cutting edge strip part is arranged between the first chip groove and the second chip groove; the top of the drill body is provided with a first cutter surface and a second cutter surface, and a cross blade is formed at the joint of two inclined surfaces of the first cutter surface and the second cutter surface; the first chip groove is provided with a cutting edge at the edge of the first knife face, the joint of the first chip groove and the chisel edge is provided with a chisel edge grinding groove, and an edge grinding groove is arranged between the second chip groove and the second knife face. Adopt the technical scheme of the utility model, to the halogen-free panel knife face wearing and tearing of high Tg under the big circumstances, can increase the life that the single-edge bored, avoid causing the stifled dirt of second slot because of the wearing and tearing problem, the plug contacts with the pore wall, arouses the coarse problem of pore wall.

Description

Drill bit is used in processing of PCB panel

Technical Field

The utility model relates to a drill bit especially relates to a drill bit is used in processing of PCB panel, and drill bit is used in panel processing that specially adapted halogen-free high glass transition temperature panel was suitable for.

Background

The function of the substrate for the printed circuit board is as important as the function of the printed circuit board for the electronic device. The base material of the PCB can be divided into two major systems of an organic base plate and an inorganic base plate according to properties, wherein the organic base plate consists of a plurality of paper layers impregnated by phenolic resin, or non-woven fabrics or glass cloth layers impregnated by epoxy resin, polyimide, cyanate ester, BT resin and the like. The use of these substrates depends on the physical properties required for PCB applications, such as operating temperature, frequency or mechanical strength. While the resin material has an important characteristic parameter: glass transition temperature, tg, (glass transition temperature) refers to the temperature transition point at which a material transitions from a relatively rigid or "glass" state to a volatile or softened state. If the temperature is below Tg, the material is in a rigid "glassy state" and if the temperature is above Tg, the material will exhibit the soft, flexible nature of a rubber-like material. With the fact that the boards are more and more dense, gaps among the through holes are smaller and smaller, the boards are provided with glass cloth, non-woven fabrics or multiple paper layers, tg of the boards used conventionally is lower, the boards are pulled slightly during drilling, and a wick effect is formed by pulling one point between two through holes. The higher the Tg value, the better the temperature resistance of the sheet, and particularly in the lead-free tin spraying process, the more the high Tg sheet is applied.

However, high Tg substrates tend to be stiffer and more brittle than low Tg substrates, which tends to affect the production efficiency of the PCB manufacturing process. And with the increasing Tg value of the plate, the drilling quantity requirement of the drill bit is more and more, the abrasion of the conventional single-edge single-groove drill bit is increased, the edge of the second tool face participates in cutting, but the second groove has no chip removal function, so that the second groove blocks dust (resin, copper, backing plate dust and the like), a blocking object is contacted with the hole wall, the hole wall is rough, the drilling quality requirement cannot be met, and the halogen-free and high-Tg plate is more obvious.

SUMMERY OF THE UTILITY MODEL

To the technical problem, the utility model discloses a drill bit is used in processing of PCB panel has solved the easy second ditch that appears of halogen-free and high Tg panel of conventional single-blade single groove drill bit processing and has crossed dirt, and leads to the coarse problem of pore wall.

To this end, the technical scheme of the utility model is that:

a drill bit for processing a PCB (printed circuit board) plate comprises a drill handle and a drill body, wherein a first spiral chip groove and a second spiral chip groove are formed in the drill body, the first chip groove and the second chip groove are arranged in a non-centrosymmetric mode relative to the rotation center of the drill bit, and a blade part is arranged between the first chip groove and the second chip groove; a first cutter face and a second cutter face are arranged at the top of the drill body, and a chisel edge is formed at the joint of two inclined faces of the first cutter face and the second cutter face; first chip groove is equipped with the cutting edge at the edge of first knife face, first chip groove is equipped with the chisel edge and repaiies the groove with the handing-over department of chisel edge, be equipped with the edge between second chip groove and the second knife face and repair the groove, promptly second chip groove is equipped with the edge towards the edge of the second knife face of drill bit direction of rotation and repaiies the groove.

By adopting the technical scheme, the length of the cutting edge can be increased by adding the chisel edge grinding groove, and the service life of the single-edge drill can be prolonged under the condition of large abrasion of the cutter face; through increasing the edge groove of repairing, carrying out the coping to the second knife face promptly, can avoid leading to the second knife face edge to participate in the cutting because of wearing and tearing problem, cause the stifled dirt of second slot (resin, copper, backing plate dust etc.), the plug arouses the coarse problem of pore wall with the pore wall contact.

As a further improvement of the utility model, the length of first chip groove is greater than the length of second chip groove.

As a further improvement of the present invention, the land portion includes a first land portion located behind the first flute and a second land portion located behind the second flute, and an area of the first land portion is larger than an area of the second land portion. The rear direction here is based on the rotational direction of the drill, and the first margin part is located behind the first flute and the second margin part is located behind the second flute during rotation.

As a further improvement of the utility model, the depth of the chisel edge grinding groove is 3% -5% of the outer diameter of the drill body.

As a further improvement of the utility model, the circular arc diameter of the chisel edge grinding groove is 2% -5% of the outer diameter of the drill body.

As a further improvement of the utility model, the depth of the edge grinding groove is 5 to 8 percent of the outer diameter of the drill body.

As a further improvement of the utility model, the arc diameter of the edge grinding groove is 90-110% of the outer diameter of the drill body.

Compared with the prior art, the beneficial effects of the utility model are that:

adopt the technical scheme of the utility model, on the basis of current single-blade drill bit, increase chisel edge coping and second knife face coping in specific position, the chisel edge coping can increase cutting edge length, to high Tg, under the big circumstances of halogen-free panel knife face wearing and tearing, can increase the life that the single-blade bored. Secondly, the grinding of the set second cutter surface can avoid the problem of abrasion, so that the edge of the second cutter surface participates in cutting to cause the second groove to block dust (resin, copper, liner plate dust and the like), and a blockage is contacted with the hole wall to cause the hole wall to be rough.

Drawings

Fig. 1 is a schematic structural diagram of a drill bit for processing a PCB plate according to an embodiment of the present invention.

Fig. 2 is a schematic end face structure diagram of the embodiment of the present invention.

The reference numerals include:

1-drill handle, 2-drill body;

11-first chip groove, 12-second chip groove, 13-first land, 14-second land, 15-cutting edge, 16-chisel edge, 17-first knife surface, 18-second knife surface, 19-chisel edge grinding groove, 20-edge grinding groove.

Detailed Description

Preferred embodiments of the present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 2, a drill for processing a halogen-free and high Tg sheet material includes a drill shank 1 and a drill body 2, the drill body 2 is provided with a spiral first chip flute 11 and a spiral second chip flute 12, a land portion is provided between the first chip flute 11 and the second chip flute 12, the land portion includes a first land 13 and a second land 14, the first land 13 is located behind the first chip flute 11 and the second land 14 is located behind the second chip flute 12 during rotation based on a rotation direction of the drill, and an area of the first land 13 is larger than an area of the second land 14.

A first cutting surface 17 and a second cutting surface 18 are arranged on the top of the front end part of the drill body 2, and a chisel edge 16 is formed on two inclined surfaces of the first cutting surface 17 and the second cutting surface 18. The edge of a first blade surface 17 of a first chip groove 11 is provided with a cutting edge 15, the first chip groove 11 and a second chip groove 12 are arranged at positions which are not centrosymmetric relative to the rotation center of the drill, the length of the first chip groove 11 is larger than that of the second chip groove 12, and the joint of the first chip groove 11 and a chisel edge 16 is subjected to thinning action to form a chisel edge grinding groove 19 and increase the length of the cutting edge 15. The edge of the second tool face 18 of the second chip groove 12 facing the rotation direction of the drill is ground, and an edge grinding groove 20 is added to avoid the gap.

The utility model discloses on the basis of current single-blade drill bit, increase the marginal groove of repairing and grinding of chisel edge groove 19 and second knife face 18. The chisel edge grinding groove 19 can increase the length of the cutting edge 15, and can prolong the service life of the single-edge drill under the condition of high Tg and large abrasion of the blade surface of the halogen-free plate; the edge grinding groove 20 is additionally arranged, even if the second tool face 18 is seriously abraded after grinding, the edge of the second tool face 18, facing the rotation direction of the drill bit, of the second chip groove 12 cannot participate in cutting, second groove dust blocking (resin, copper, base plate dust and the like) cannot be caused, and good hole wall quality is guaranteed.

Preferably, the depth h1 of the chisel edge grinding groove 19 is 13% of the outer diameter of the drill body, the circular arc diameter d2 of the chisel edge grinding groove 19 is 2% of the outer diameter d1 of the drill body, the chisel edge 16 can be effectively ground, the positioning accuracy is improved, the length of the cutting edge 15 is lengthened, the service life of the drill bit is prolonged, and in addition, the grinding unit can independently become a cutting system and has an auxiliary effect on chip removal of the drill bit.

Further preferably, the depth h2 of the edge grinding groove 20 of the second tool face 18 is 16% of the outer diameter d1 of the drill body, and the circular arc diameter d3 of the edge grinding groove 20 is 100% of the outer diameter d1 of the drill body, so that even if the tool face is seriously worn, the position can be effectively cleared away after grinding, and does not participate in cutting, thereby preventing chips from entering the second groove, and ensuring good hole wall quality.

The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the shape and structure of the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a drill bit is used in processing of PCB panel which characterized in that: the drill bit comprises a drill handle and a drill body, wherein a first helical chip removal groove and a second helical chip removal groove are formed in the drill body, the first chip removal groove and the second chip removal groove are arranged in a non-centrosymmetric mode relative to the rotation center of the drill bit, and a blade belt part is arranged between the first chip removal groove and the second chip removal groove; the top of the drill body is provided with a first cutter surface and a second cutter surface, and a cross blade is formed at the joint of two inclined surfaces of the first cutter surface and the second cutter surface; first chip groove is equipped with the cutting edge at the edge of first knife face, the handing-over department of first chip groove and chisel edge is equipped with the chisel edge and repaiies the groove, be equipped with the edge between second chip groove and the second knife face and repair the groove.

2. The drill for plate processing according to claim 1, wherein: the length of the first chip groove is larger than that of the second chip groove.

3. The drill for plate processing according to claim 2, wherein: the land portion includes a first land portion located behind the first flute and a second land portion located behind the second flute, and an area of the first land portion is larger than an area of the second land portion.

4. The drill for plate processing according to claim 2, wherein: the depth of the chisel edge grinding groove is 3% -5% of the outer diameter of the drill body.

5. The drill for processing a plate material as recited in claim 4, wherein: the diameter of the circular arc of the chisel edge grinding groove is 2% -5% of the outer diameter of the drill body.

6. The drill for processing a plate material as recited in claim 5, wherein: the depth of the edge grinding groove is 5% -8% of the outer diameter of the drill body.

7. The drill for plate processing according to claim 6, wherein: the arc diameter of the edge grinding groove is 90-110% of the outer diameter of the drill body.