CN213859635U

CN213859635U - Drill bit for punching MARK point of PCB

Info

Publication number: CN213859635U
Application number: CN202022675803.0U
Authority: CN
Inventors: 曹相泽
Original assignee: Shenzhen Jinbangda Electronics Co ltd
Current assignee: Shenzhen Jinbangda Electronics Co ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-08-03
Anticipated expiration: 2030-11-18

Abstract

The utility model discloses a drill bit for punching MARK points on PCB boards, belonging to the field of drill bits for processing PCB boards, wherein the top end of the drill bit is provided with a first cutting part and a second cutting part for cutting PCB boards, and the second cutting part and the first cutting part are arranged along the axis of the drill bit; the front end of the second cutting part is connected with the tail end of the first cutting part, and the diameter of the second cutting part is larger than that of the first cutting part; compared with the prior art, the conventional drill bit cannot be used for punching mark points, and a circle of shallow-depth isolation groove is formed outside a blind hole punched by the first cutting part during drilling of the drill bit; the edge of the blind hole is prevented from being corroded, and the identified precision of the mark hole is improved.

Description

Drill bit for punching MARK point of PCB

Technical Field

The utility model belongs to processing drill bit field for the PCB specifically is a dash PCB board mark drill bit for point.

Background

The MARK point is a position identification point of a PCB applied to an automatic chip mounter in circuit board design; the selection of mark points directly influences the chip mounting efficiency of the automatic chip mounter; the MARK point can play a role in identifying and positioning, and the equipment reads the edge profile of the periphery of the MARK point through the CCD by fully utilizing the principle of optical reflection. Therefore, the size and the graphic area of the positioning device are calculated, and the positioning device plays a role in accurate positioning.

In the traditional MARK manufacturing process, the MARK point is over-etched frequently due to the fast flowing of the etching solution during the alkaline etching; the damage, roughness and deformation of the edge of the MARK point can influence the accuracy of CCD reading, and the positioning precision can be reduced in the production process; meanwhile, the requirement of the conventional electronic equipment on the positioning accuracy of the MARK point is higher and higher in the production process, so how to prevent the edge profile of the MARK point from being damaged in the production process is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the technology, the utility model provides a drill bit for punching a MARK point of a PCB, the front end of the drill bit comprises a first cutting part with smaller diameter and a second cutting part with larger diameter, and when a MARK hole is punched, a circle of isolation groove with shallow depth is formed outside the hole punched by the first cutting part; the edge of the blind hole is prevented from being corroded, and the positioning precision of the mark hole is improved.

In order to achieve the above object, the present invention provides a drill bit for punching a MARK point of a PCB, wherein a first cutting portion and a second cutting portion for cutting the PCB are disposed at a top end of the drill bit, and the second cutting portion and the first cutting portion are disposed along an axis of the drill bit; the front end of the second cutting part is connected with the tail end of the first cutting part, and the diameter of the second cutting part is larger than that of the first cutting part.

According to the specific scheme, the first cutting portion and the second cutting portion both comprise thread structures, and the drill bit rotates to drive threads to cut into the PCB.

In a specific scheme, the second cutting part is in transitional connection with the first cutting part through an inclined plane.

In a specific scheme, the inclined plane is a threaded inclined plane.

Preferably, the length of the inclined plane in the axial direction of the drill bit is 0.1mm

In a specific embodiment, the diameter of the second cutting portion is greater than twice the diameter of the first cutting portion and less than four times the diameter of the first cutting portion.

In a specific scheme, the diameter of the first cutting part is 1-3 mm.

In a specific aspect, the length of the second cutting portion in the axial direction of the drill bit is less than half the length of the first cutting portion in the axial direction.

In a specific scheme, the tail end of the drill is a smooth surface without a thread structure and is used for being connected with an external driving structure, and the length from the tail end to the top end of the drill is 2-5 cm.

The utility model has the advantages that: the utility model provides a drill bit for punching MARK points on PCB boards, the top end of the drill bit is provided with a first cutting part and a second cutting part for cutting the PCB boards, and the second cutting part and the first cutting part are arranged along the axis of the drill bit; the front end of the second cutting part is connected with the tail end of the first cutting part, and the diameter of the second cutting part is larger than that of the first cutting part; compared with the prior art, the conventional drill bit cannot be used for punching mark points, and a circle of shallow-depth isolation groove is formed outside a blind hole punched by the first cutting part during drilling of the drill bit; the edge of the blind hole is prevented from being corroded, and the identified precision of the mark hole is improved.

Drawings

FIG. 1 is a view of a drill bit according to the present invention;

FIG. 2 is an enlarged view of the top structure of the drill bit of the present invention;

FIG. 3 is a schematic diagram of mark point positions on a PCB;

fig. 4 is a cross-sectional view of the present invention for punching holes on a PCB.

The main element symbols are as follows:

11. a first cutting portion; 12. a second cutting portion; 13. a bevel; 2. a drill tip; 31. blind holes; 32. And (4) an isolation region.

Detailed Description

In order to make the present invention clearer, the present invention will be further described with reference to the accompanying drawings.

As described in the background art, too fast flow of the etching liquid in the alkaline etching often causes Mark point over-etching; the damage, roughness and deformation of the edge of the MARK point can influence the accuracy of CCD reading; based on this, the utility model provides a can dash PCB board MARK point and use drill bit, refer to fig. 1 and fig. 2, the drill bit top is equipped with first cutting portion 11 and second cutting portion 12 for cutting the PCB board, and second cutting portion 12 and first cutting portion 11 set up along the axis of drill bit; the front end of the second cutting part 12 is connected with the end of the first cutting part 11, and the diameter of the second cutting part 12 is larger than that of the first cutting part 11.

Compared with the prior art, the conventional drill cannot be used for punching mark points, and a circle of shallow-depth isolation groove is formed outside the blind hole 31 punched by the first cutting part 11 during drilling of the drill; the edge of the blind hole 31 is prevented from being corroded, and the identified precision of the mark hole is improved.

In this embodiment, the drill is made of metal and is rod-shaped as a whole; the first cutting part 11 and the second cutting part 12 are arranged at one end of the rod, the first cutting part 11 and the second cutting part 12 both comprise a thread structure, and the drill bit rotates to drive threads to cut into the PCB from the flat surface; the first cutting part 11 cuts a blind hole 31 at a preset position on the PCB, and the second cutting part 12 cuts an isolation area 32 at the periphery of the blind hole 31; the blind hole 31 is used for filling bare copper, and the peripheral isolation region 32 is kept empty, namely, the cut PCB panel; the contrast with bare copper is high, and the visual identification effect can be improved.

In the present embodiment, referring to fig. 3 and 4, the distance between the edge of the isolation region 32 and the edge of the PCB is greater than 5 mm; if the PCB is too close to the edge of the PCB, the situation that the PCB is not recognized by a CCD camera is easy to occur; the flatness Ra of the filled bare copper is less than 15 micrometers; the uniformity of the reflected light in the identification process is ensured.

In the present embodiment, the second cutting portion 12 and the first cutting portion 11 are transitionally connected by a bevel 13; if the cutting edge is a vertical plane, the diameter of the second cutting part 12 is increased, and after the first cutting part 11 is completely cut into the PCB, the second cutting part 12 is difficult to cut into the PCB, and the second cutting part 12 is more easily cut into the PCB through the transition of the inclined plane 13; more preferably, the inclined plane 13 is a threaded inclined plane 13; so that the second cutting portion 12 cuts into the PCB more easily.

Preferably, the length of the inclined plane 13 in the axial direction of the drill bit is 0.1 mm; when the PCB is cut, the transition zone is cut out between the blind hole 31 and the isolation zone 32 by the inclined plane 13, and the transition zone is too wide due to the overlong inclined plane 13, so that the angle of the light reflected by the blank zone is influenced, and the visual identification effect is influenced.

In a specific scheme, the diameter of the second cutting part 12 is more than twice the diameter of the first cutting part 11 and less than four times the diameter of the first cutting part 11; the radius of the isolation region 32 is guaranteed to be larger than twice of the radius of the blind hole 31, the contrast of mark points and the surrounding environment is enhanced, and the mark points are easier to identify by a machine; however, too large a radius of the isolation region 32 will occupy too much area on the PCB; preferably, the radius of the isolation region 32 is three times that of the blind hole 31, that is, the diameter of the second cutting portion 12 is more than three times that of the first cutting portion 11; wherein the diameter of the first cutting portion 11 is 1-3 mm.

Specifically, the length of the second cutting portion 12 in the axial direction of the drill is less than half of the length of the first cutting portion 11 in the axial direction; i.e. the blind hole 31 is twice as deep as the isolation region 32; filling bare copper into the blind hole 31 to be flush with the isolation region 32; wherein the depth of the isolation regions 32 is shallow.

According to the specific scheme, the tail end of the drill bit is a smooth surface without a thread structure and is used for being connected with an external driving structure, and the length from the tail end 2 of the drill bit to the top end is 2-5cm, so that the drill bit is conveniently connected with the driving structure; the length of the front end is less than the thickness of the PCB; less than 2.3 mm.

The utility model has the advantages that:

1. the top end of the drill bit is provided with a first cutting part and a second cutting part for cutting the PCB, and the second cutting part and the first cutting part are arranged along the axis of the drill bit; the front end of the second cutting part is connected with the tail end of the first cutting part, and the diameter of the second cutting part is larger than that of the first cutting part; compared with the prior art, the conventional drill bit cannot be used for punching mark points, and a circle of shallow-depth isolation groove is formed outside a blind hole punched by the first cutting part during drilling of the drill bit; the edge of the blind hole is prevented from being corroded, and the identified precision of the mark hole is improved.

2. The diameter of the second cutting part is more than twice the diameter of the first cutting part and less than four times the diameter of the first cutting part; the radius of the isolation region is ensured to be more than twice of the radius of the blind hole, the contrast of mark points and the surrounding environment is enhanced, and the mark points are easier to identify by a machine; but also not occupy too much PCB area.

3. The second cutting part is in transitional connection with the first cutting part through an inclined plane; if the PCB is a vertical plane, the diameter of the second cutting part is increased, so that the second cutting part is difficult to cut into the PCB after the first cutting part is completely cut into the PCB, and the second cutting part is easier to cut into the PCB by arranging slope transition.

The above disclosure is only for the specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A drill bit for punching a MARK point of a PCB is characterized in that the top end of the drill bit is provided with a first cutting part and a second cutting part for cutting the PCB, and the second cutting part and the first cutting part are arranged along the axis of the drill bit; the front end of the second cutting part is connected with the tail end of the first cutting part, and the diameter of the second cutting part is larger than that of the first cutting part.

2. The drill bit for punching MARK points on PCB boards as claimed in claim 1, wherein the first cutting portion and the second cutting portion each comprise a thread structure, and rotation of the drill bit causes the thread to cut into the PCB board.

3. The drill bit for punching the MARK point of the PCB board as claimed in claim 2, wherein the second cutting portion is connected with the first cutting portion by a bevel transition.

4. The drill bit for punching MARK points on PCB boards as claimed in claim 3, wherein the bevel is a threaded bevel.

5. The drill bit for punching MARK points on PCB boards as claimed in claim 3, wherein the length of the inclined plane in the axial direction of the drill bit is 0.1 mm.

6. The drill bit for punching the MARK point of the PCB board as claimed in claim 1, wherein the diameter of the second cutting portion is more than twice the diameter of the first cutting portion and less than four times the diameter of the first cutting portion.

7. The drill bit for punching MARK points on PCB board as claimed in claim 6, wherein the diameter of the first cutting portion is 1-3 mm.

8. The drill bit for punching the MARK point of PCB board of claim 6, wherein the length of the second cutting portion along the axial direction of the drill bit is less than half of the length of the first cutting portion along the axial direction.

9. The drill bit for punching MARK points on PCB boards as claimed in claim 1, wherein the drill bit terminates with a smooth surface without a thread structure for connection with an external driving structure, and the length from the end of the drill bit to the top end is 2-5 cm.