CN102009198A

CN102009198A - Method for manufacturing PCB short slot

Info

Publication number: CN102009198A
Application number: CN 201010509170
Authority: CN
Inventors: 周刚; 赵志平; 赵耀
Original assignee: HUIZHOU CHINA EAGLE ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: HUIZHOU CHINA EAGLE ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2010-10-14
Filing date: 2010-10-14
Publication date: 2011-04-13

Abstract

The invention relates to the field of printed circuit board (PCB) manufacture, in particular to a method for manufacturing a PCB slot. The method comprises the following steps of: (1) manufacturing a slot graph on a PCB; (2) drilling a guide hole in two edges of the length direction of the slot graph respectively; and (3) performing superposition drilling based on the guide holes by adopting a drill bit, the diameter of which is equal to the short diameter of the slot, wherein the diameter of the guide holes is less than half of the long diameter of the slot. The method can effectively avoid the quality problems of deformation, large slots, small slots and the like in the short slot processing process, reduces unnecessary rejection of the PCB, reduces the production cost of enterprises and greatly improves the production efficiency.

Description

The preparation method of the short slotted eye of a kind of pcb board

Technical field

The present invention relates to PCB and make the field, be specifically related to the preparation method of the short slotted eye of a kind of pcb board.

Background technology

Along with modern electronic product day by day to the trend development of miniaturization, high integrated, high performance, the boring aperture of printed wiring board also requires more and more littler, quality requirements is more and more higher, the particularly making of slotted eye, the main effect of slotted eye is to be used for the client plug-in mounting or part is installed, and its quality directly has influence on the installation and the use of client's product.If the slotted eye of producing has quality defects such as distortion, groove is big, groove is little, client can't be carried out the plug-in unit operation.The drilling operating of printed wiring board, most of is that machine is holed, kind comprises circular hole and slotted eye.

Slotted eye is divided into long slot bore and short slotted eye, and flute length is called short slotted eye less than the slotted eye of 2 times of groove widths.This short slotted eye is formed by the overlapping boring of a plurality of circular holes back, and the brill that adopts diameter to equal groove width when promptly holing is chewed at slotted eye one edge and bored a hole, more folded boring on the slotted eye length direction.In the process that boring superposes, Yi Bian because slotted eye bored, be easy to the problem of chewing the both sides discontinuity occur boring, thus cause short slotted eye distortion, become greatly or diminish, cause the finished product yield of pcb board low, production cost increases.

Summary of the invention

The problem that the present invention need solve provides the preparation method that a kind of reliable and stable pcb board that can significantly improve the slotted eye quality is lacked slotted eye.

For addressing the above problem, the technical scheme that the present invention takes is: the preparation method of the short slotted eye of a kind of pcb board is provided, the steps include:

(1) on pcb board, makes the slotted eye figure;

(2) in the two edges of the length direction of slotted eye figure, bore a guide hole respectively;

(3) brill that adopts diameter to equal the slotted eye minor axis on the guide hole basis is chewed the boring that superposes.

Concrete scheme is: described guide hole diameter is less than half of slotted eye major diameter; Described two guide holes and slotted eye length direction two edges are inscribe respectively.

Preferred scheme is: described guide hole diameter is: (D-0.15)/2mm, wherein D is the slotted eye major diameter.

The method of the invention can effectively be avoided quality problem such as distortion, the groove in the short slotted eye process is big, groove is little, has reduced that pcb board is unnecessary to be scrapped, and has reduced enterprise's production cost, and production efficiency improves greatly.

Description of drawings

Accompanying drawing 1 is a short slotted eye work flow schematic diagram of the present invention.

The specific embodiment

For the ease of those skilled in the art's understanding, structure of the present invention is further described in detail below in conjunction with accompanying drawing.

As shown in Figure 1, short slotted eye preparation method of the present invention is when carrying out the drillhole pattern making, increases

guide hole

10 and 11, and when making folded boring, boring to chew all has the part that is in vacant state, effectively avoids boring the situation of chewing discontinuity.

During concrete operations, at first according to the slotted eye figure made, carrying out the drilling operating (step 1 and 2) of two

guide holes

10 and 11 in slotted eye major diameter two edges symmetry, when boring guide hole, is edge-smoothing, guide hole and the slotted eye pattern edge inscribe that guarantees the finished product slotted

eye.Guide hole

10 and 11 diameter need half less than the slotted eye major diameter, and promptly two guide holes do not contact mutually.

Since

guide hole

10 and 11 diameter be whole flute length 1/2 less than, so holed 20 o'clock carrying out the 3rd step, unsettled below can not chewing because of brill, and the discontinuity phenomenon that produces was then holed 21 o'clock, the part of hole 21 and hole 20 stacks, brill is chewed the below with unsettled, chews another side because the existence of guide hole 11 is also corresponding unsettled and bore, both sides are stressed can keep equilibrium, reduces to bore in the boring procedure and chews the quality problem that unbalance stress causes.

The last processing of groove width, the i.e. folded drilling bore hole 30 on 20,21 bases, hole of carrying out again.Because the effect of

guide hole

10 and 11 is arranged, final slotted eye flute length and groove width all can satisfy quality requirements, have avoided short slotted eye adding quality abnormals such as the distortion, the groove that occur man-hour are big, groove is little, have reduced unnecessary pcb board to scrap, reduced production cost, production efficiency improves greatly.

Guide hole 10 and diameter the best of 11 are (D-0.15)/2mm, and wherein D is the slotted eye major diameter.Chew boring 21 o'clock because the diameter of

guide hole

10 and 11 more near the slotted eye minor axis, bores, both sides institute is stressed balanced more.Consider that the guide hole effect will perform to the best when practical operation difficulty and other factor affecting, guide hole diameter are got above-mentioned value.

The foregoing description only is a preferred implementation of the present invention, and in addition, the present invention can also have other implementations.That is to say that under the prerequisite that does not break away from the present invention's design, any conspicuous replacement and minor variations all should fall within protection scope of the present invention.

Claims

1. the preparation method of the short slotted eye of pcb board the steps include:

(1) on pcb board, makes the slotted eye figure;

2. the preparation method of the short slotted eye of pcb board according to claim 1 is characterized in that: described two guide holes and slotted eye length direction two edges are inscribe respectively.

3. the preparation method of the short slotted eye of pcb board according to claim 2 is characterized in that: described guide hole diameter is less than half of slotted eye major diameter.

4. the preparation method of the short slotted eye of pcb board according to claim 3, it is characterized in that: described guide hole diameter is: (D-0.15)/and 2mm, wherein D is the slotted eye major diameter.