High-precision blind fishing process and method thereof

Abstract

The invention provides a high-precision blind scooping process which comprises the following steps: S1, dividing a hard board into a plurality of laminated boards through a milling cutter of a forming machine, and designing a blind scooping program of each laminated board; s2, a milling cutter of a blind scooping machine starts to conduct first-time blind scooping at a first preset depth from the surface of the laminated plate along a set blind scooping path, and rough scooping of a first blind scooping groove is completed; s3, the step S2 is repeated for multiple times until rough fishing of the multiple blind fishing grooves in the laminated plate is completed; s4, the first blind fishing groove is subjected to second-time blind fishing, and fine fishing of the first blind fishing groove is completed; s5, the step S4 is repeated for multiple times until fine fishing of the multiple blind fishing grooves in the laminated plate is completed; s6, forming the laminated plate to obtain a semi-finished product; and S7, measuring the residual thickness of the semi-finished product, performing appearance inspection, and obtaining a finished product after the semi-finished product is qualified. According to the blind fishing procedure, rough fishing and fine trimming are completed through one cutter, the cutting amount is uniform and stable, and the problem that the size of the cutting position is not stable due to blind fishing is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of conveying control, in particular to a high-precision blind scooping process and a method thereof. Background Art

[0002] With the development of science and technology, social progress and the improvement of people's living standards, electronic products have become an indispensable item in people's lives. Among the basic components of electronic products, PCBs occupy a dominant position in products. The existing depth control milling technology generally pre-sets the depth of the back depth control milling according to different PCBs and different blind groove design requirements, and then controls the milling according to this preset depth. There are currently two methods. One is to use the thickness between the groove surface of the board and the target layer as the set value, and adopt the blind fishing depth control method to make it; the other is to use the thickness from the bottom layer of the blind fishing to the remaining thickness of the remaining board as the set value, and adopt the blind fishing residual thickness control method to make it; the above two methods can achieve an accuracy within 2mil, but with the development trend of consumer electronic products being thin, integrated and intelligent, the production process requirements for printed circuit boards are getting higher and higher, and the size requirements for printed circuit boards are becoming more and more stringent. The accuracy within 2mil (50um) has met the blind fishing requirements of the defective part of the PCB board, affecting the production efficiency of the board, so the error accuracy of 30um cannot be achieved by relying entirely on equipment accuracy and old methods. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a high-precision blind fishing process, which can effectively meet the high-precision blind fishing requirements and reduce the cost of the blind fishing milling cutter by more than half.

[0004] The technical solution adopted by the present invention is: A high-precision blind fishing process, which includes the following steps: Step S1. Provide a hard board, divide the hard board into multiple stacked boards by a milling cutter of a forming machine, and design a blind scooping path of multiple blind scooping grooves for each stacked board on a blind scooping machine, wherein the area of ​​each blind scooping groove is greater than 5×5 mm; Step S2. The milling cutter of the blind fishing machine starts from the surface of the stacked plate and performs the first blind fishing along the blind fishing path at a first preset depth to complete the rough fishing of the first blind fishing groove; Step S3. Repeat step S2 multiple times until the rough fishing of multiple blind fishing grooves on the stacked plate is completed; Step S4. Control the milling cutter of the forming machine to return to the starting position, and carry out a second blind fishing of the first blind fishing groove of the stacked plate that has been roughly fished out in step S3 through the milling cutter of the blind fishing machine along the blind fishing path at a second preset depth, thereby completing the fine fishing of the first blind fishing groove; Step S5. The plurality of blind dredging grooves in step S3 are sequentially blind dredged by the milling cutter of the blind dredging machine along the blind dredging path at a second preset depth until the plurality of blind dredging grooves on the stacked plate are finely dredged; Step S6. Forming the laminated plate obtained in step S5 to obtain a semi-finished product; Step S7: The semi-finished product is measured for residual thickness by a residual thickness meter, and an appearance inspection is performed. After the inspection is qualified, the finished product is obtained.

[0005] Preferably, in the high-precision blind fishing process, the diameter of the milling cutter of the molding machine in step S1 is 0.8-2.5 mm.

[0006] Preferably, in the high-precision blind fishing process, the length and width of the stacked plates are 0.15-0.2 mm larger than the length and width of the finished product.

[0007] Preferably, in the high-precision blind scooping process, the diameter of the milling cutter of the blind scooping machine in step S2 is 0.8-2.5 mm.

[0008] Preferably, in the high-precision blind fishing process, the second preset depth is 0.1-0.3 mm greater than the first preset depth.

[0009] Preferably, in the high-precision blind scooping process, the same milling cutter is used for the rough scooping in steps S2 and S3 and the fine scooping in steps S4 and S5.

[0010] Preferably, in the high-precision blind fishing process, step S6 is specifically to trim the finished stacked plate so that the length and width meet the requirements of the finished product. Advantages of the present invention: (1) The high-precision blind fishing process of the present invention uses the same blind fishing milling cutter for rough fishing and fine finishing processes, which can achieve a blind fishing residual thickness accuracy within 30um. The life of the blind fishing milling cutter is increased by more than double, meeting the process requirements to achieve process accuracy and reduce costs.

[0011] (2) The high-precision blind fishing process of the present invention adopts one tool for rough fishing and fine finishing in the blind fishing procedure, and is completed with one tool number. After the rough fishing of the whole plate is completed, the milling cutter is not replaced, and it directly retreats to the starting position to start fine finishing. At this time, the blind fishing blade is worn and used on the fine finishing path, so there is no problem of severe wear of the new blade in the first 4 meters or so. The worn blind fishing blade does not have as much wear as the new milling cutter, is relatively stable, and the cutting amount is uniform and stable, which effectively solves the problem of unstable size of the cutting position caused by blind fishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of a blind bailing tank according to the high-precision blind bailing process of the present invention. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0014] Example 1 like Figure 1 , a high-precision blind fishing process, comprising the following steps: Step S1. Provide a plurality of hard boards, and divide the plurality of hard boards into a plurality of stacked boards by a milling cutter of a forming machine, wherein the diameter of the milling cutter of the forming machine is 1.2 mm, and design a blind scooping path of a plurality of blind scooping grooves of each stacked board on a blind scooping machine, wherein the area of ​​each blind scooping groove is greater than 5×5 mm; Step S2. The stacked plate is passed through a milling cutter of a blind scooping machine to perform the first blind scooping from the stacked plate surface along the blind scooping path at a first preset depth H1, and the diameter of the milling cutter is 1.6 mm, to complete the rough scooping of the first blind scooping groove; Step S3. Repeat step S2 multiple times until the rough fishing of multiple blind fishing grooves on the stacked plate is completed; Step S4. Control the milling cutter of the forming machine to return to the starting position, and carry out a second blind fishing of the first blind fishing groove of the stacked plate that has been roughly fished out in step S3 through the milling cutter of the blind fishing machine along the blind fishing path at a second preset depth H2 to complete the fine fishing of the first blind fishing groove; the second preset depth H2 is 0.25 mm greater than the first preset depth H1; Step S5. The plurality of blind fishing grooves in step S3 are sequentially blind-fished by the milling cutter of the blind fishing machine along the blind fishing path at a second preset depth H2 until the precision fishing of the plurality of blind fishing grooves on the stacked plate is completed, and the second preset depth H2 is 0.25 mm greater than the first preset depth H1; Step S6. Forming the laminated plates finished by fine scooping in step S5, wherein the length and width of the laminated plates meet the requirements of the finished product, wherein the rough scooping in steps S2 and S3 and the fine scooping in steps S4 and S5 are performed by the same milling cutter; Step S7: measure the residual thickness H3 of the finished product through a residual thickness meter and perform an appearance inspection.

[0015] The residual thickness of multiple finished products was measured, and the maximum residual thickness was 0.2845mm, the minimum was 0.2564mm, and the average was 0.2704mm. The blind fishing residual thickness accuracy was within 30μm, meeting the process accuracy requirements.

[0016] Example 2 like Figure 1 , a high-precision blind fishing process, comprising the following steps: Step S1. Provide a hard board, and divide the hard board into multiple stacked boards by a milling cutter of a forming machine, the diameter of the milling cutter of the forming machine is 1.4 mm, and design a blind scooping path of multiple blind scooping grooves for each stacked board on a blind scooping machine, and the area of ​​each blind scooping groove is greater than 20×20 mm; Step S2. The stacked plate is passed through a milling cutter of a blind scooping machine to perform the first blind scooping from the stacked plate surface along the blind scooping path at a first preset depth H1, the diameter of the milling cutter is 1.8 mm, and the rough scooping of the first blind scooping groove is completed; Step S3. Repeat step S2 multiple times until the rough fishing of multiple blind fishing grooves on the stacked plate is completed; Step S4. Control the milling cutter of the forming machine to return to the starting position, and carry out a second blind fishing of the first blind fishing groove of the stacked plate that has been roughly fished out in step S3 through the milling cutter of the blind fishing machine along the blind fishing path at a second preset depth H2 to complete the fine fishing of the first blind fishing groove; the second preset depth H2 is 0.20 mm greater than the first preset depth H1; Step S5. The plurality of blind fishing grooves in step S3 are sequentially blind-fished by the milling cutter of the blind fishing machine along the blind fishing path at a second preset depth H2 until the precision fishing of the plurality of blind fishing grooves on the stacked plate is completed, and the second preset depth H2 is 0.20 mm greater than the first preset depth H1; Step S6. Forming the laminated plates finished by fine scooping in step S5, wherein the length and width of the laminated plates meet the requirements of the finished product, wherein the rough scooping in steps S2 and S3 and the fine scooping in steps S4 and S5 are performed by the same milling cutter; Step S7: Measure the residual thickness H3 of the finished product through a residual thickness meter and perform an appearance inspection.

[0017] The residual thickness of multiple finished products was measured, and the maximum residual thickness was 0.3182mm, the minimum was 0.2911mm, and the average was 0.3081mm. The blind fishing residual thickness accuracy was within 30μm, meeting the process accuracy requirements.

[0018] Example 3 like Figure 1 , a high-precision blind fishing process, comprising the following steps: Step S1. Provide a hard board, and divide the hard board into multiple stacked boards by a milling cutter of a forming machine, the diameter of the milling cutter of the forming machine is 1.6 mm, and design a blind scooping path of multiple blind scooping grooves for each stacked board on a blind scooping machine, and the area of ​​each blind scooping groove is greater than 40×40 mm; Step S2. The stacked plate is passed through a milling cutter of a blind scooping machine to perform the first blind scooping from the stacked plate surface along the blind scooping path at a first preset depth H1, and the diameter of the milling cutter is 2.0 mm, to complete the rough scooping of the first blind scooping groove; Step S3. Repeat step S2 multiple times until the rough fishing of multiple blind fishing grooves on the stacked plate is completed; Step S4. Control the milling cutter of the forming machine to return to the starting position, and carry out a second blind fishing of the first blind fishing groove of the stacked plate that has been roughly fished out in step S3 through the milling cutter of the blind fishing machine along the blind fishing path at a second preset depth H2 to complete the fine fishing of the first blind fishing groove; the second preset depth H2 is 0.15 mm greater than the first preset depth H1; Step S5. The plurality of blind fishing grooves in step S3 are sequentially blind-fished by the milling cutter of the blind fishing machine along the blind fishing path at a second preset depth H2 until the precision fishing of the plurality of blind fishing grooves on the stacked plate is completed, and the second preset depth H2 is 0.15 mm greater than the first preset depth H1; Step S6. Forming the laminated plates finished by fine fishing in step S5, so that the length and width of the laminated plates meet the requirements of the finished product, and obtaining the finished product, wherein the rough fishing in steps S2 and S3 and the fine fishing in steps S4 and S5 are performed by the same milling cutter; Step S7: Measure the residual thickness H3 of the finished product through a residual thickness meter and perform an appearance inspection.

[0019] The residual thickness of multiple finished products was measured, and the maximum residual thickness was 0.3643mm, the minimum was 0.3358mm, and the average was 0.3491mm. The accuracy of blind fishing residual thickness was within 30μm, which met the process accuracy requirements.

[0020] The high-precision blind fishing process of the present invention is aimed at the large-area blind fishing groove of the hard board. The blind fishing program design is divided into rough fishing and fine finishing paths. The two paths are completed in one program with one tool number. The worn blind fishing blade is used as the fine finishing path, and the cutting amount is uniform and stable. The designed program is read into the blind fishing machine, and the single-piece PCB board is fixed on the table of each axis of the blind fishing machine. A flat-head blind fishing knife is selected, and the life is set according to twice the life of a single-pass board, and is accurate to the life of the end of two passes. After the blind fishing is completed, the size inspection and appearance inspection are carried out, and those that meet the requirements enter the next process.

[0021] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A high-precision blind fishing process, characterized in that: The following steps are involved: Step S1. Provide a hard board, divide the hard board into multiple stacked boards by a milling cutter of a forming machine, and design a blind scooping program of multiple blind scooping grooves for each stacked board on a blind scooping machine, wherein the area of ​​each blind scooping groove is greater than 5×5 mm; Step S2. The milling cutter of the blind fishing machine starts from the surface of the stacked plate along the set blind fishing path to perform the first blind fishing at a first preset depth to complete the rough fishing of the first blind fishing groove; Step S3. Repeat step S2 multiple times until the rough fishing of multiple blind fishing grooves on the stacked plate is completed; Step S4. Control the milling cutter of the forming machine to return to the starting position, and carry out a second blind fishing of the first blind fishing groove of the stacked plate that has been roughly fished out in step S3 through the milling cutter of the blind fishing machine along the blind fishing path at a second preset depth, thereby completing the fine fishing of the first blind fishing groove; Step S5. The plurality of blind dredging grooves in step S3 are sequentially blind dredged by the milling cutter of the blind dredging machine along the blind dredging path at a second preset depth until the plurality of blind dredging grooves on the stacked plate are finely dredged; Step S6. Forming the laminated plate obtained in step S5 to obtain a semi-finished product; Step S7: The semi-finished product is measured for residual thickness by a residual thickness meter, and an appearance inspection is performed. After the inspection is qualified, the finished product is obtained.

2. The high-precision blind fishing process according to claim 1, characterized in that: The diameter of the milling cutter of the molding machine in step S1 is 0.8-2.5 mm.

3. The high-precision blind fishing process according to claim 1, characterized in that: The length and width of the laminate are both 0.15-0.2 mm greater than the length and width of the finished product.

4. The high-precision blind fishing process according to claim 1, characterized in that: The diameter of the milling cutter of the blind bailing machine in step S2 is 0.8-2.5 mm.

5. The high-precision blind fishing process according to claim 1, characterized in that: The second preset depth is 0.1-0.3 mm greater than the first preset depth.

6. The high-precision blind fishing process according to claim 1, characterized in that: The same milling cutter is used for the rough scooping in step S2 and step S3 and the fine scooping in step S4 and step S5.

7. The high-precision blind fishing process according to claim 1, characterized in that: The forming step S6 is specifically as follows: the laminated plates that have been finely scooped are finely trimmed so that the length and width meet the requirements of the finished product.

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