CN111331443A - Processing method for coarse grinding of PCB drill point blade - Google Patents
Processing method for coarse grinding of PCB drill point blade Download PDFInfo
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- CN111331443A CN111331443A CN202010349537.4A CN202010349537A CN111331443A CN 111331443 A CN111331443 A CN 111331443A CN 202010349537 A CN202010349537 A CN 202010349537A CN 111331443 A CN111331443 A CN 111331443A
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- grinding
- tungsten steel
- grinding wheel
- steel needle
- diamond
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
- B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/006—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/12—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention relates to the technical field of PCB drill point processing, in particular to a processing method for roughly grinding a PCB drill point blade, which comprises a tungsten steel needle semi-finished product, a grinding speed controller, a tumbling mill, a vertical laser machine and a stereo microscope; the method comprises the following steps: setting DOE experiment, selecting a tumbling mill to carry out rough edge grinding on the tungsten steel needle semi-finished product, and setting grinding wheel grinding speed parameters by using a grinding speed controller; detecting the tungsten steel needle after grinding and recording data; recording the processing time and the output; tabulating and comparing the obtained data to obtain an experimental conclusion, and selecting an optimal processing technology; and (4) optimizing the grinding wheel used in the process. The processing method for roughly grinding the PCB drill point blade has the advantages of reducing the frequency of grinding wheel dressing, shortening the processing time, improving the processing efficiency, along with high product yield and attractive appearance.
Description
Technical Field
The invention relates to the technical field of PCB drill point processing, in particular to a processing method for rough grinding and grinding a PCB drill point blade.
Background
At present, the global PCB market keeps steadily increasing under the drive of the Internet of things, automobile electronics, industry 4.0, cloud servers, storage devices and the like. With the increasing of the output of printed circuit boards, the output of PCB drill points is also developing vigorously, and the usage amount of PCB drill points in the chinese market is about 8 hundred million/year.
In the PCB drill point industry, the processing technology is mostly tungsten steel and stainless steel welding technology, so that the PCB drill point blade is roughly ground, and the processing problem is caused when the tungsten steel blade and the stainless steel handle neck are processed; the rough grinding processing of the PCB drill point blade mainly comprises the grinding process of the surface of a grinding wheel, the tungsten steel part of the drill point blade and the stainless steel part at the neck of a handle, and in the grinding process, the grinding wheel can lose the original geometric shape due to the fact that the surface of the grinding wheel is blocked by abrasive dust or stuck and embedded by the abrasive dust and the abrasive material falls off, so that the grinding wheel is dull. In the process, the processed materials are respectively stainless steel and tungsten steel, so that the wear degrees of different parts of the traditional diamond grinding wheel in the processing process are different, namely, the processed stainless steel part is seriously worn than the processed tungsten steel part, the neck of the stainless steel handle is deformed, the product quality is reduced, and the finishing frequency is increased. The reason for this is that the diamond grinding wheel for rough grinding of the edge in the current PCB drill point processing industry has advantages in processing the tungsten steel of the edge, but the stainless steel of the neck of the processing handle is poor in performance, so that sand change is easily caused, and the appearance of the product is abnormal.
Disclosure of Invention
The invention provides a processing method for roughly grinding a PCB drill point blade, aiming at solving the problems of low grinding efficiency and low product yield in the prior art.
The technical scheme adopted by the invention is as follows:
a processing method for roughly grinding a PCB drill point blade comprises a tungsten steel needle semi-finished product, a grinding speed controller, a roller mill, a vertical laser machine and a stereo microscope; the method comprises the following steps:
(1) setting DOE experiment, selecting a tumbling mill to carry out rough edge grinding on the tungsten steel needle semi-finished product, and setting a grinding speed parameter of a grinding wheel by using a grinding speed controller;
(11) the tumbling mill selects a diamond grinding wheel, rough edge grinding is carried out on the semi-finished product of the tungsten steel needle, and the grinding speed controller respectively selects a 30k speed reducer, a 50k speed reducer and a 75k speed reducer to grind the tungsten steel needle;
(12) the roller mill selects a CBN grinding wheel to perform rough edge grinding on the semi-finished product of the tungsten steel needle, and the grinding speed controller respectively selects a 30k speed reducer, a 50k speed reducer and a 75k speed reducer to grind the tungsten steel needle;
(13) the edge coarse grinding is carried out on the tungsten steel needle semi-finished product by the roller mill by using a diamond and CBN composite grinding wheel, and the tungsten steel needle is ground by a grinding speed controller by using a 30k speed reducer, a 50k speed reducer and a 75k speed reducer respectively;
(2) detecting the tungsten steel needle after grinding and recording data: detecting the size of the ground tungsten steel needle blade part by using a vertical laser machine, acquiring and calculating to obtain the diameter CPK of the tungsten steel needle head part and the concentricity CPK of the tungsten steel needle head part, detecting the appearance of the neck of the handle by using a stereo microscope, and judging whether the product is qualified;
(3) recording the time from the beginning of processing to the time when the tumbling mill needs to be finished as a shift, and counting the number of single-shift processing and the corrected single-shift processable quantity; recording the time from the beginning to the end of grinding of the tumbling mill as one time, and counting the time required by single processing;
(4) and (3) sorting and tabulating the data counted in the step (2) and the step (3), and comparing the tabulated data to obtain a conclusion: the best material of the selected tumbling mill is a diamond and CBN composite grinding wheel, and the best material of the selected grinding speed controller is a 50k speed reducer;
(5) according to the difference of the length of the cutting part of the tungsten steel needle, selecting the diamond and CBN composite grinding wheels with different thicknesses: the outermost end of the CBN material in the composite grinding wheel is trimmed into an inclined plane by using a grinding wheel trimming machine, the inclined plane keeps the same angle with the inclined plane at the neck of the tungsten steel needle, the grinding wheel with universal thickness is selected to increase the applicability of the grinding wheel, and the grinding wheel is prevented from being frequently replaced.
Further, in the diamond and CBN composite grinding wheel, the diamond part is used for grinding the tungsten steel needle blade part, and the CBN part is used for grinding the stainless steel handle part.
Further, the diamond and CBN composite grinding wheel is formed by layering and pressing diamond grinding materials and CBN grinding materials, wherein the diamond grinding materials comprise 15mm diamond grinding materials and 5mm CBN grinding materials.
The invention has the beneficial effects that: the processing method for rough grinding and grinding of the PCB drill point edge adopts the diamond and CBN composite grinding wheel, and utilizes the grinding material characteristic of the grinding wheel, namely the diamond grinding wheel is mainly applied to grinding tungsten steel bars, and the performance is more stable when the tungsten steel edge is processed. The CBN grinding wheel is mainly applied to grinding stainless steel, the performance is stable when a stainless steel handle is machined, the dulling time of the grinding wheel is greatly reduced, two grinding materials are combined, the dressing frequency is mainly determined by a combination part, namely the position of a neck part of a grinding drill bit, the part needs to be dressed after being deformed, when the diamond and CBN composite grinding wheel is used for machining a PCB drill bit edge rough grinding process, the dressing frequency of the grinding wheel is reduced from 3000 to 19000, and the time for dressing the grinding wheel in the edge rough grinding process and debugging a machine after the grinding wheel is repaired is greatly reduced; and the speed reducer is combined, so that the quality can be guaranteed, and the original 70k speed reducer is changed into a 50k speed reducer, so that the time is saved, and the processing efficiency is improved.
In a word, the processing method for roughly grinding the PCB drill point blade has the advantages of reducing the dressing times of the grinding wheel, shortening the processing time, improving the processing efficiency, having high product yield and being attractive in appearance.
Drawings
FIG. 1 is a grinding structure diagram of a diamond and CBN composite grinding wheel of a PCB drill point rough grinding processing method provided by the invention;
FIG. 2 is a grinding structure diagram of a diamond grinding wheel of the processing method for roughly grinding the PCB drill point blade provided by the invention;
FIG. 3 is a grinding structure diagram of a CBN grinding wheel of the processing method for roughly grinding the PCB drill point blade provided by the invention;
FIG. 4 is a line drawing of the PCB drill pin head diameter CPK of the present invention;
FIG. 5 is a line drawing of a CPK line of concentricity of the head of a PCB drill pin in the present invention;
FIG. 6 is a line graph of the quantity of products which can be processed by the grinding wheel in one time in the invention:
fig. 7 is a line graph showing the efficiency of single-pass processing in the present invention.
In the figure: 1. a tungsten steel needle blade; 2. a stainless steel handle; 3. a diamond grinding wheel; 4. CBN grinding wheel; 5. diamond and CBN composite grinding wheel.
Detailed Description
The core of the invention is to provide a processing method for roughly grinding the PCB drill point blade.
The invention will be further explained with reference to the accompanying drawings:
when the PCB drill point blade rough grinding processing method is used specifically, a technician researches the PCB drill point blade rough grinding processing technology, starts with grinding of a grinding wheel and a speed reducer, researches a processing method of PCB drill point blade rough grinding, and improves efficiency and yield of the PCB drill point blade rough grinding processing technology so as to provide reference for the PCB drill point blade rough grinding processing technology.
The method comprises the following steps:
adopting a diamond and CBN composite grinding wheel: the rough grinding processing of the PCB drill point blade mainly comprises the grinding process of the surface of a grinding wheel, the tungsten steel part of the drill point blade and the stainless steel part at the neck of a handle, and in the grinding process, the grinding wheel can lose the original geometric shape due to the fact that the surface of the grinding wheel is blocked by abrasive dust or stuck and embedded by the abrasive dust and the abrasive material falls off, so that the grinding wheel is dull. In the description of the problems, the main contradiction is that when the grinding wheel with the same abrasive material is used for processing two materials, the dressing frequency of the grinding wheel is improved, and the output per shift is reduced. The diamond and CBN composite grinding wheel is adopted, and the grinding material characteristic of the grinding wheel is utilized, namely the diamond grinding wheel is mainly applied to grinding tungsten steel bars, and the performance is stable when a tungsten steel blade part is machined. The CBN grinding wheel is mainly applied to grinding stainless steel, the performance is stable when a stainless steel handle is machined, the dulling time of the grinding wheel is greatly reduced, two grinding materials are combined, the dressing frequency is mainly determined by a combination part, namely the position of a neck part of a grinding drill bit, the grinding drill bit needs to be dressed after the deformation of the part, when the diamond and CBN composite grinding wheel is used for machining a PCB drill bit edge rough grinding process, the dressing frequency of the grinding wheel is reduced to 19000 for 3000 times, and the time for repairing the grinding wheel in the edge rough grinding process and debugging a machine table after the grinding wheel is repaired is greatly reduced.
By adopting a 50K speed reducer, the single-branch machining time is 4.19S, the product size and the appearance performance are stable, the process yield can reach 99.61%, the head diameter process capability CPK is about 2.0 generally, the performance is good, and compared with the condition that the quality of the products machined by a 75K speed reducer is consistent, the single-branch time is reduced by 33.06%, and the machining efficiency of the edge rough grinding process is greatly improved. The data obtained in the process steps are tabulated as shown in tables 1-4 below.
In actual production, according to the specification of the length of the PCB drill point blade, diamond and CBN composite grinding wheels with different thicknesses are selected, a CBN grinding material part in the composite grinding wheel shown in figure 1 needs to be trimmed by a grinding wheel trimming machine to form an inclined plane with the same angle as the drill point neck, and the length L1 of the inclined plane in the horizontal direction is about 1mm greater than the length L2 of the rough grinding neck of the PCB drill point blade. Examples are: the product with the specification of 1.30 × 11.0mm is processed in the edge rough grinding process, and the product parameters are diameter phi =1.30, edge length L =11.0, neck angle a =20 ° and neck length 2.67mm, so the thickness of the grinding wheel selected by us is about 11.0+1mm (1-2mm reserved amount) + 2.67+1mm (1-2mm reserved amount) =15.67mm of diamond grinding material, namely the grinding wheel with the total thickness of 16mm, wherein the thickness of the diamond grinding material is 12mm, the thickness of the CBN grinding material is 4mm, and the above steps are only taken as examples. In the practical application process, as shown in the figure, the CBN abrasive part is trimmed to form an inclined plane with the same angle as the neck of the drill point by using a grinding wheel dresser and a 200-mesh green carbon grinding wheel to grind the stainless steel neck part, and the diamond abrasive part is also trimmed by using the grinding wheel dresser and the 200-mesh green carbon grinding wheel to ensure the grinding force of the grinding wheel. In addition, the grinding wheel base needs to be adjusted to ensure that the joint of the diamond grinding material and the CBN grinding material and the welding part of the tungsten steel blade part and the stainless steel handle are kept consistent, so that the composite grinding wheel is perfectly applied to the rough grinding process of the PCB drill point blade.
And the speed reducer also plays an important role in the process of rough grinding of the edge of the PCB drill point. The speed reducer mainly controls the grinding speed by controlling the speed of the rotary movement of the material. When a 30K speed reducer is used, the material processing speed is high, the abrasion of the grinding wheel is high, the broken plane is easy to appear at the neck of the stainless steel handle of the product, the size of the blade part is unstable, and the requirements of the manufacturing process are not met. When a 50K speed reducer is used, the material processing speed is moderate, the product appearance meets the process requirements, no plane and no neck injury exist, and the size performance is stable. When a 75K speed reducer is used, the product quality is basically consistent with 50K, but the grinding efficiency is low, compared with the 50K speed reducer, the number of products processed in one shift is reduced by 33.06%, and the aim of high efficiency is not achieved. Therefore, the method is implemented by adopting a 50K speed reducer and matching with a diamond and CBN composite grinding wheel scheme.
The invention combines the advantages of the diamond and CBN composite grinding wheel, changes the speed reducer from 75K to 50K, reduces the single support time of the PCB drill point by 33.06%, saves the grinding wheel finishing and the debugging time after the grinding wheel finishing, can improve the output of the blade rough grinding shift by 90%, and improves the output of the blade rough grinding shift by 5000 supports to 9500 supports, thereby greatly improving the production efficiency.
According to the embodiment, the processing method for roughly grinding the PCB drill point blade has the advantages of reducing the frequency of grinding wheel dressing, shortening the processing time, improving the processing efficiency, having high product yield and being attractive in appearance.
Claims (3)
1. The processing method for roughly grinding the PCB drill point blade is characterized by comprising the following steps of: comprises a tungsten steel needle semi-finished product, a grinding speed controller, a tumbling mill, a vertical laser machine and a stereo microscope; the method comprises the following steps:
(1) setting DOE experiment, selecting a tumbling mill to carry out rough edge grinding on the tungsten steel needle semi-finished product, and setting a grinding speed parameter of a grinding wheel by using a grinding speed controller;
(11) the tumbling mill selects a diamond grinding wheel, rough edge grinding is carried out on the semi-finished product of the tungsten steel needle, and the grinding speed controller respectively selects a 30k speed reducer, a 50k speed reducer and a 75k speed reducer to grind the tungsten steel needle;
(12) the roller mill selects a CBN grinding wheel to perform rough edge grinding on the semi-finished product of the tungsten steel needle, and the grinding speed controller respectively selects a 30k speed reducer, a 50k speed reducer and a 75k speed reducer to grind the tungsten steel needle;
(13) the edge coarse grinding is carried out on the tungsten steel needle semi-finished product by the roller mill by using a diamond and CBN composite grinding wheel, and the tungsten steel needle is ground by a grinding speed controller by using a 30k speed reducer, a 50k speed reducer and a 75k speed reducer respectively;
(2) detecting the tungsten steel needle after grinding and recording data: detecting the size of the ground tungsten steel needle blade part by using a vertical laser machine, acquiring and calculating to obtain the diameter CPK of the tungsten steel needle head part and the concentricity CPK of the tungsten steel needle head part, detecting the appearance of the neck of the handle by using a stereo microscope, and judging whether the product is qualified;
(3) recording the time from the beginning of processing to the time when the tumbling mill needs to be finished as a shift, and counting the processing amount of the single shift and the corrected processing amount of the single shift; recording the time from the beginning to the end of grinding of the tumbling mill as one time, and counting the time required by single processing;
(4) and (3) sorting and tabulating the data counted in the step (2) and the step (3), and comparing the tabulated data to obtain a conclusion: the best material of the selected tumbling mill is a diamond and CBN composite grinding wheel, and the best material of the selected grinding speed controller is a 50k speed reducer;
(5) according to the difference of the length of the cutting part of the tungsten steel needle, selecting the diamond and CBN composite grinding wheels with different thicknesses: the outermost end of the CBN material in the composite grinding wheel is trimmed into an inclined plane by using a grinding wheel trimming machine, the inclined plane keeps the same angle with the inclined plane at the neck of the tungsten steel needle, the grinding wheel with universal thickness is selected to increase the applicability of the grinding wheel, and the grinding wheel is prevented from being frequently replaced.
2. The method for roughly grinding the PCB drill point blade according to claim 1, wherein: in the diamond and CBN composite grinding wheel, the diamond part is used for grinding the tungsten steel needle blade part, and the CBN part is used for grinding the stainless steel handle.
3. The method for roughly grinding the PCB drill point blade according to claim 1, wherein: the diamond and CBN composite grinding wheel is formed by layering and pressing diamond grinding materials and CBN grinding materials, wherein the diamond grinding materials comprise 15mm diamond grinding materials and 5mm CBN grinding materials.
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| CN2020100464618 | 2020-01-16 | ||
| CN202010046461 | 2020-01-16 |
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| CN111331443A true CN111331443A (en) | 2020-06-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114042970A (en) * | 2021-10-27 | 2022-02-15 | 南阳鼎泰高科有限公司 | PCB cutter and preparation method thereof |
| CN114454256A (en) * | 2022-01-08 | 2022-05-10 | 奥士康科技股份有限公司 | Management and control method for prolonging grinding life of PCB drill bit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114042970A (en) * | 2021-10-27 | 2022-02-15 | 南阳鼎泰高科有限公司 | PCB cutter and preparation method thereof |
| CN114454256A (en) * | 2022-01-08 | 2022-05-10 | 奥士康科技股份有限公司 | Management and control method for prolonging grinding life of PCB drill bit |
| CN114454256B (en) * | 2022-01-08 | 2023-10-13 | 奥士康科技股份有限公司 | Control method for prolonging grinding life of PCB drill bit |
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Application publication date: 20200626 |
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