CN112969313B - PTH (plated through hole) half-hole manufacturing method - Google Patents

Abstract

The invention provides a PTH half-hole manufacturing method. The manufacturing method of the PTH half-hole comprises the following steps: s1: defining half-holes: when the number of the continuous half holes is less than or equal to 3 and the aperture of the half hole is more than 1.75mm and less than 8mm, the finished gong is obtained; when the number of continuous half holes is more than 3 and the aperture of the half hole is more than 0.45 and less than or equal to 1.75mm, etching the first gong by alkali; s2: and (3) manufacturing a half hole: aiming at the finished gong: when the copper cutting position is arc-shaped, the cutter is arranged at the copper cutting position of the half hole; when the copper cutting position is a right angle, designing a routing path of a routing tool at the copper cutting position of the half hole to be 45 degrees, and cutting into the right angle position for 3 mils so as to avoid generating burrs when an outer frame is routed; aiming at alkaline etching of the previous gong: and according to different diameters of the half holes of the finished product, performing the steps of copper sheet drilling, scrap pulling, rough routing and fine routing. The PTH half-hole manufacturing method provided by the invention has the advantages of high working efficiency and cost saving.

Description

A kind of PTH semi-hole manufacturing method

technical field

The invention relates to the technical field of circuit boards, in particular to a method for manufacturing PTH half-holes.

Background technique

At present, most half-hole plates produced in the industry are of abnormal quality due to half-hole burrs and half-hole copper-free. There are various methods for solving half-hole burrs. Conventional method of semi-hole plate: drilling - electroplating - circuit - two copper - tinning - forming a gong - stripping film - stripping tin - etching, when forming a gong, there is no question whether the half hole really needs to be made in one gong There is no definition, and there is no control method for half-hole burrs and half-hole copper-free. In this way, a part of the boards that could have been put into the finished product can also be put into the same board, resulting in a waste of cost. Secondly, a clear control method is also needed for half-hole burrs and half-hole copper-free.

Therefore, it is necessary to provide a new PTH semi-hole manufacturing method to solve the above technical problems.

Contents of the invention

The technical problem solved by the invention is to provide a PTH semi-hole manufacturing method with high working efficiency and cost saving.

In order to solve the above-mentioned technical problems, the PTH semi-hole manufacturing method provided by the invention comprises the following steps:

S1: Defining the half hole:

When there are ≤3 consecutive semi-holes, and the diameter of the semi-holes is 1.75mm<D<8mm, it is a finished gong;

When there are more than 3 consecutive semi-holes, and the diameter of the semi-holes is 0.45<D≤1.75mm, it is before alkali etching

a gong;

S2: Make the half hole:

For the finished gong: when the copper cutting part is arc-shaped, cut the knife at the half-hole copper cutting part; when the copper cutting part is right-angled, design the path of the gong knife at the half-hole copper cutting part at 45°, and cut 3mil into the right-angle part to avoid When the gong is outside the frame, it produces a front;

For the work before alkali etching: according to the diameter of the half hole of the finished product, the steps of drilling copper skin, pulling waste, roughing and finishing are carried out.

Preferably, in the step S1, when the diameter of the half hole is 1.75mm<D<3mm, a 1.2 gong knife front and back gong is used; when the half hole diameter is 3mm≤D<8mm, a 1.4 gong knife front and back gong is used.

Preferably, in the step S2:

When the diameter of the half hole is 0.45mm<D≤0.8mm, and the copper thickness of the finished product surface is ≥70um, and the diameter of the half hole of the finished product is ≥1/2, the sequence of gongs and knives is waste pulling, coarse gongs, and fine gongs, and one gong and a half hole is pre-finished on one side. Leave 4mil, the finished product has a half hole;

When the diameter of the half-hole is 0.45mm<D≤0.8mm, and the copper thickness of the finished product is less than 70um, and the diameter of the half-hole of the finished product is ≥1/2, the order of the belt cutter is scrap, coarse, and fine;

When the diameter of the half hole is 0.8mm<D≤1.75mm, and the copper thickness of the finished product surface is ≥70um, and the diameter of the half hole of the finished product is ≥1/2, the sequence of the gong belt knife is scrap pulling, coarse gong, and fine gong, and one gong and a half hole is pre-finished on one side. Leave 4mil, the finished gong has a fine half hole; the diameter of the finished half hole is <1/2, the gong belt knife sequence is to drill copper skin, pull scraps, rough gong, fine gong, reserve 4mil on one side of a gong and a half hole, and the finished gong is fine gong half hole;

When the diameter of the half hole is 0.8mm<D≤1.75mm, and the copper thickness of the finished product surface is less than 70um, the diameter of the half hole of the finished product is ≥1/2, and the sequence of gongs and knives is scrap, coarse gong, and fine gong; the diameter of the finished half hole is less than 1/2 2. The sequence of gongs with knives is drilling copper skin, pulling waste, rough gongs, and fine gongs.

Preferably, when the copper cutting point in the step S2 is at a right angle, the path of the gong knife is designed to be 45° at the half hole copper cutting point, and the distance between the cutting point in the hole and the hole copper is ≥ 0.2mm.

Preferably, the diameter of the gong knife is 1.0-1.4mm.

Preferably, in the step of pulling waste materials, only the base material on the opposite side of the half hole is pulled to achieve the dust removal effect, and the waste materials are removed with a gong knife.

Preferably, when the distance between the half-holes is less than 1.2mm, the half-holes will be touched, and the gong knife is 1.0mm.

Preferably, when the gong knife is half-holed, it is given priority to ensure that the gong is not broken, and the minimum distance between waste and rough gong knife and the edge of the half-hole is 0.1 mm.

Preferably, in the step of drilling the copper skin, the diameter of the gong cutter is 1.0mm, the angle is 45°, and the cutting depth is 3mil.

Preferably, in the step of copper skin, adjacent half holes are arranged up and down, and when the minimum distance between the upper and lower sides is less than 1.2 mm, the half holes are drilled in the form of PTH grooves.

Compared with related technologies, the PTH semi-hole manufacturing method provided by the present invention has the following beneficial effects:

The invention provides a method for manufacturing PTH half-holes, which can make a part of PTH half-holes that can be produced as a finished product without going through a single process, which greatly saves costs, and has a good formula for half-hole burrs and half-holes without copper. control method.

Description of drawings

Fig. 1 is the structural representation of a kind of preferred embodiment of PTH semi-hole manufacturing method provided by the present invention;

Fig. 2 is a schematic structural view of the drill bit assembly shown in Fig. 1;

FIG. 3 is an enlarged schematic diagram of part A shown in FIG. 1;

Fig. 4 is a schematic structural view of the drill bit mount shown in Fig. 1;

FIG. 5 is a schematic structural diagram of the mounting block shown in FIG. 1 .

Symbols in the figure: 1. Drilling equipment, 2. Drill mounting seat, 3. Installation slot, 4. Drill assembly, 5. Mounting block, 6. Drill, 7. Wedge-shaped slot, 8. Through hole, 9. Slider , 10, wedge-shaped block, 11, screw mandrel, 12, handle, 13, bearing, 14, strip limit hole, 15, limit block, 16, positioning groove, 17, positioning block.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

First embodiment:

In an embodiment of the present invention, the PTH semi-hole manufacturing method includes the following steps:

S1: Defining the half hole:

When there are ≤3 consecutive semi-holes, and the diameter of the semi-holes is 1.75mm<D<8mm, it is a finished gong;

When there are more than 3 consecutive semi-holes, and the diameter of the semi-holes is 0.45<D≤1.75mm, it is before alkali etching

a gong;

S2: Make the half hole:

For the finished gong: when the copper cutting part is arc-shaped, cut the knife at the half-hole copper cutting part; when the copper cutting part is right-angled, design the path of the gong knife at the half-hole copper cutting part at 45°, and cut 3mil into the right-angle part to avoid When the gong is outside the frame, it produces a front;

For the work before alkali etching: according to the diameter of the half hole of the finished product, the steps of drilling copper skin, pulling waste, roughing and finishing are carried out.

In the step S1, when the diameter of the half hole is 1.75 mm<D<3 mm, use a 1.2 gong knife front and back gong; when the half hole diameter is 3 mm≤D<8 mm, use a 1.4 gong knife front and back gong.

In the step S2:

When the diameter of the half hole is 0.45mm<D≤0.8mm, and the copper thickness of the finished product surface is ≥70um, and the diameter of the half hole of the finished product is ≥1/2, the sequence of gongs and knives is waste pulling, coarse gongs, and fine gongs, and one gong and a half hole is pre-finished on one side. Leave 4mil, the finished product has a half hole;

When the diameter of the half-hole is 0.45mm<D≤0.8mm, and the copper thickness of the finished product is less than 70um, and the diameter of the half-hole of the finished product is ≥1/2, the order of the belt cutter is scrap, coarse, and fine;

When the diameter of the half hole is 0.8mm<D≤1.75mm, and the copper thickness of the finished product surface is ≥70um, and the diameter of the half hole of the finished product is ≥1/2, the sequence of the gong belt knife is scrap pulling, coarse gong, and fine gong, and one gong and a half hole is pre-finished on one side. Leave 4mil, the finished product has a half hole;

The diameter of the half hole of the finished product is less than 1/2. The sequence of the gong belt knife is to drill the copper skin, pull the scrap, rough gong, and fine gong. 4mil is reserved on one side of the half hole, and the finished gong is fine and half hole;

When the diameter of the half-hole is 0.8mm<D≤1.75mm, and the copper thickness of the finished product surface is less than 70um, and the diameter of the half-hole of the finished product is ≥1/2, the order of the cutting tool is scrap, coarse and fine;

The diameter of the half-hole of the finished product is less than 1/2, and the sequence of gongs and knives is to drill copper skin, pull scraps, rough gongs, and fine gongs.

In the step S2, when the copper cutting point is at a right angle, the path of the gong knife at the copper cutting point of the half hole is designed to be 45°, and the distance between the cutting point in the hole and the hole copper is ≥0.2mm.

The diameter of the gong cutter is 1.0-1.4mm.

In the waste pulling step, only the substrate on the opposite side of the half hole is pulled to achieve the dust removal effect, and the waste is removed with a gong knife.

When the distance between the half-holes is less than 1.2mm, it will touch the half-holes, and the gong knife uses a 1.0mm model.

When the gong knife is half-holed, the priority is to ensure that the gong does not break, and the minimum distance between waste and rough gong knife and the half-hole edge is 0.1mm.

In the step of drilling the copper skin, the diameter of the gong cutter is 1.0 mm, the angle is 45°, and the cutting depth is 3 mil.

In the copper skin step, the upper and lower rows of adjacent half holes, when the minimum distance between the upper and lower sides is less than 1.2mm, the half holes are drilled in the form of PTH grooves.

The detailed definition and production method of a PTH semi-pore is as follows:

Compared with related technologies, the PTH semi-hole manufacturing method provided by the present invention has the following beneficial effects:

The invention provides a method for manufacturing PTH half-holes, which can make a part of PTH half-holes that can be produced as a finished product without going through a single process, which greatly saves costs, and has a good formula for half-hole burrs and half-holes without copper. control method.

Second embodiment:

Based on the PTH half-hole manufacturing method provided in the first embodiment of the present application, the second embodiment of the present application proposes another PTH half-hole manufacturing method. The second embodiment is only a preferred mode of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

The second embodiment of the present invention will be further described below in conjunction with the drawings and implementation methods.

Please refer to Fig. 1-Fig. 5 in combination, the difference between this embodiment and the first embodiment is that the drilling equipment 1 is used for drilling, and the output shaft of the drilling equipment 1 is equipped with a drill mounting base 2, and the drill bit The bottom side of the mounting seat 2 is provided with a mounting groove 3 , and a drill assembly 4 is installed in the mounting groove 3 , and the bottom end of the drill assembly 4 extends out of the mounting groove 3 .

The drill bit assembly 4 includes a mounting block 5 and a drill bit 6 , and wedge-shaped slots 7 are opened on both sides of the mounting block 5 .

Both sides of the installation groove 3 are provided with through holes 8, and a slide bar 9 is slidably installed in the through hole 8, and one end of the slide bar 9 extends into the installation groove 3 and is fixedly installed with a wedge Block 10, the wedge-shaped block 10 is adapted to the wedge-shaped slot 7, a screw 11 is installed in the through hole 8, and the screw 11 is threadedly connected with the slide rod 9. One end of the threaded rod 11 extends out of the through hole 8 and is fixedly mounted with a handle 12 .

A bearing 13 is installed in the through hole 8 , and the inner ring of the bearing 13 is fixedly socketed with the screw rod 11 .

A bar-shaped limiting hole 14 is provided on the top side inner wall of the through hole 8, and a limiting block 15 is fixedly installed on the top side of the slide bar 9, and the limiting block 15 slides with the bar-shaped limiting hole 14. connect.

Both sides inner walls of the mounting groove 3 are provided with a positioning groove 16, the bottom side of the positioning groove 16 is an opening, and both sides of the mounting block 5 are fixedly equipped with a positioning block 17, and the positioning block 17 and the The positioning groove 16 is suitable.

The above is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (7)

1. A PTH semi-hole manufacturing method, is characterized in that, comprises the following steps: S1: Defining the half hole: When there are ≤3 consecutive semi-holes, and the diameter of the semi-holes is 1.75mm<D<8mm, it is a finished gong; When there are more than 3 consecutive semi-holes, and the diameter of the semi-holes is 0.45mm<D≤1.75mm, it is the first gong before alkali etching; S2: Make the half hole: For the finished gong: when the copper cutting part is arc-shaped, cut the knife at the half-hole copper cutting part; when the copper cutting part is right-angled, design the path of the gong knife at the half-hole copper cutting part at 45°, and cut 3mil into the right-angle part to avoid When the gong is outside the frame, it produces a front; For the first stage of alkali etching: according to the diameter of the half hole of the finished product, the steps of drilling copper skin, pulling waste, roughing and finishing are carried out; In the step S1, when the diameter of the half hole is 1.75mm<D<3mm, use a 1.2 gong knife front and back; when the half hole diameter is 3mm≤D<8mm, use a 1.4 gong knife front and back gong; In the step S2: When the diameter of the half hole is 0.45mm<D≤0.8mm, and the copper thickness of the finished product is ≥70um, and the area of the half hole of the finished product is ≥1/2 of the whole hole area, the sequence of gongs and knives is scrap pulling, coarse gongs, fine gongs, one gong and a half hole 4mil is reserved on one side, and the finished product has half a hole; When the diameter of the half-hole is 0.45mm<D≤0.8mm, and the copper thickness of the finished product is less than 70um, and the area of the half-hole of the finished product is ≥1/2 the area of the whole hole, the order of the gongs and knives is waste pulling, coarse gongs, and fine gongs; When the diameter of the half hole is 0.8mm<D≤1.75mm, and the copper thickness of the finished product is ≥70um, and the area of the half hole of the finished product is ≥1/2 the area of the whole hole, the sequence of gongs and knives is scrap pulling, coarse gongs, fine gongs, one gong and a half hole 4mil is reserved on one side, and the finished product has a half hole and a fine hole; the area of the half hole of the finished product is less than 1/2 the area of the whole hole. Leave 4mil, the finished product has a half hole; When the diameter of the half hole is 0.8mm<D≤1.75mm, and the copper thickness of the finished product surface is less than 70um, and the area of the half hole of the finished product is ≥1/2 of the whole hole area, the sequence of the gongs and knives is waste, rough gongs, and fine gongs; the area of the half holes of the finished product <1/2 of the whole hole area, the sequence of gongs and knives is to drill copper skin, pull scraps, rough gongs, and fine gongs. 2. The PTH half-hole manufacturing method according to claim 1, characterized in that, when the copper-cutting place is a right angle in the step S2, the path design of the gong knife at the half-hole copper-cutting place is 45°, and the cutting point in the hole is Distance from hole copper ≥ 0.2mm. 3. The PTH half-hole manufacturing method according to claim 1, characterized in that, in the waste pulling step, only the opposite side base material of the half hole is pulled to achieve the dust removal effect, and the waste is removed using a gong knife. 4. The PTH half-hole manufacturing method according to claim 3, characterized in that, when the distance between the half-holes is less than 1.2 mm, the half-holes will be touched, and a gong knife of 1.0 mm is used for pulling waste. 5. The PTH half-hole manufacturing method according to claim 1, characterized in that, when the gong knife is used to make the half-hole, the priority is to ensure that the gong does not break, and the minimum distance between the waste and the thick gong knife and the side of the half-hole is 0.1 mm. 6. The PTH semi-hole manufacturing method according to claim 1, characterized in that, in the step of drilling the copper skin, the diameter of the gong cutter is 1.0mm, the angle is 45°, and the depth of cut is 3mil. 7. The PTH half-hole manufacturing method according to claim 1, characterized in that, in the step of drilling the copper skin, adjacent half-holes are arranged up and down, and when the minimum distance between the upper and lower sides is less than 1.2 mm, the half-holes are drilled in the form of PTH grooves out.

Images