A kind of automatic repair equipment for printed wiring board product defect

Abstract

The application provides a kind of for printed wiring board product defect automatic repair equipment, belong to the technical field of circuit board defect automatic repair equipment, the for printed wiring board product defect automatic repair equipment includes marble base plate;Mounting plate, mounting plate is located on the upside of marble base plate by Y-axis moving mechanism, the movement of mounting plate is controlled by Y-axis moving mechanism;U-shaped frame, U-shaped frame is fixedly connected to the upper end of marble base plate;Sliding plate, sliding plate is located on the side of U-shaped frame by X-axis moving mechanism, by the device, the defect of circuit board surface is positioned by CCD defect detector when repairing the printed circuit board with defect, improve the precision of circuit board defect repair, the repair effect of circuit board is detected by CCD defect detector after being milled by milling cutter to repair the surface of circuit board, the surface of the circuit board that is repaired does not exist defect, guarantee the precision of circuit board repair, improve the repair efficiency of printed wiring board.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of automatic repair equipment for circuit board defects, and particularly relates to an automatic repair equipment for defects of printed circuit board products. BACKGROUND

[0002] The printed circuit board is processed according to the national standard. If the printed circuit board has defects such as burrs, small hole diameter, short circuit, protruding copper and residual copper, the repair equipment needs to be used to mill and repair the circuit board. After the milling and repair, the defects on the surface of the printed circuit board product are repaired, so that the circuit board meets the requirements.

[0003] In the prior art, when the printed circuit board is repaired by using the repair equipment, the printed circuit board to be repaired is installed in the repair equipment, and the milling cutter in the repair equipment is controlled to mill and repair the circuit board product. After the repair is completed, the milling cutter needs to be removed, the repair effect of the circuit board cannot be detected, and some circuit boards still have defects after the repair is completed, which affects the repair efficiency of the circuit board. SUMMARY

[0004] The present application aims to provide an automatic repair equipment for defects of printed circuit board products, which aims to solve the problem in the prior art that the milling cutter in the repair equipment is controlled to mill and repair the circuit board product, the milling cutter needs to be removed after the repair is completed, the repair effect of the circuit board cannot be detected, and some circuit boards still have defects after the repair is completed, which affects the repair efficiency of the circuit board.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] An automatic repair equipment for defects of printed circuit board products comprises:

[0007] A marble base plate;

[0008] An installation plate is arranged on the upper side of the marble base plate through a Y-axis moving mechanism, and the movement of the installation plate is controlled through the Y-axis moving mechanism;

[0009] A U-shaped frame is fixedly connected to the upper end of the marble base plate;

[0010] A sliding plate is arranged on one side of the U-shaped frame through an X-axis moving mechanism, and the movement of the sliding plate is controlled through the X-axis moving mechanism;

[0011] An H-shaped frame is arranged on one side of the sliding plate through a Z-axis moving mechanism, and the movement of the H-shaped frame is controlled through the Z-axis moving mechanism;

[0012] A main shaft assembly is arranged in the H-shaped frame; and

[0013] A milling cutter is connected with a spindle assembly, and the operation of the milling cutter is controlled by the spindle assembly.

[0014] As a preferred scheme of the present application, the Y-axis moving mechanism comprises a Y-axis motor, a Y-axis screw rod, first guide rails and a Y-axis threaded block, the first guide rails are provided in two, both of the first guide rails are fixedly connected to the upper end of the marble base plate, the mounting plate is slidably connected to the surface of the two first guide rails, the Y-axis threaded block is fixedly connected to the lower end of the mounting plate, the Y-axis motor is fixedly connected in the marble base plate, one end of the Y-axis screw rod is fixedly connected to the output end of the Y-axis motor, the other end of the Y-axis screw rod is rotatably connected in the marble base plate, and the Y-axis screw rod is in threaded connection with the Y-axis threaded block.

[0015] As a preferred scheme of the present application, the X-axis moving mechanism comprises an X-axis motor, an X-axis screw rod, an X-axis threaded block and second guide rails, the second guide rails are provided in two, both of the second guide rails are fixedly connected to one side end of the U-shaped frame, the sliding plate is slidably connected to the surface of the two second guide rails, the X-axis threaded block is fixedly connected to one side end of the sliding plate, the X-axis motor is fixedly connected in the U-shaped frame, one end of the X-axis screw rod is fixedly connected to the output end of the X-axis motor, the other end of the X-axis screw rod is rotatably connected in the U-shaped frame, and the X-axis screw rod is in threaded connection with the X-axis threaded block.

[0016] As a preferred scheme of the present application, the Z-axis moving mechanism comprises a Z-axis motor, a Z-axis screw rod, a Z-axis threaded block and third guide rails, the third guide rails are provided in two, both of the third guide rails are fixedly connected to the surface of the sliding plate, the H-shaped frame is slidably connected to the surface of the two third guide rails, the Z-axis motor is fixedly connected to the upper end of the sliding plate, the Z-axis threaded block is fixedly connected to one side end of the H-shaped frame, one end of the Z-axis screw rod is fixedly connected to the output end of the Z-axis motor, the other end of the Z-axis screw rod is rotatably connected in the sliding plate, and the Z-axis screw rod is in threaded connection with the Z-axis threaded block.

[0017] As a preferred scheme of the present application, the spindle assembly comprises a spindle motor, a connecting shaft and a shell, the shell is fixedly connected to one side end of the H-shaped frame, the spindle motor is fixedly connected to the upper inner wall of the shell, the connecting shaft is rotatably connected in the shell, one end of the connecting shaft is fixedly connected to the output end of the spindle motor, and the other end of the connecting shaft is fixedly connected to the upper end of the milling cutter.

[0018] As a preferred scheme of the present application, the surface of the H-shaped frame is fixedly connected with a laser range finder.

[0019] As a preferred scheme of the present application, the surface of the H-shaped frame is fixedly connected with a CCD1 defect detector.

[0020] As a preferred scheme of the present application, the surface of the H-shaped frame is fixedly connected with a CCD2 defect detector.

[0021] As a preferred scheme of the present application, the marble bottom plate is internally provided with a PC motion card control module, which is signal connected with the X-axis motor, the Y-axis motor, the Z-axis motor and the main shaft motor respectively and controls the operation of the X-axis motor, the Y-axis motor, the Z-axis motor and the main shaft motor respectively.

[0022] A use method of a printed circuit board product defect automatic repairing device, comprising the following steps:

[0023] S1, initializing the device, controlling the PC motion card control module to control the X-axis motor, the Y-axis motor and the Z-axis motor to reset, so that the X-axis motor, the Y-axis motor and the Z-axis motor control the operation of the X-axis moving mechanism, the Y-axis moving mechanism and the Z-axis moving mechanism respectively, and the mounting plate, the sliding plate and the H-shaped frame move to the initial position;

[0024] S2, controlling the operation of the CCD1 defect detector, obtaining the length diameter and other information of the milling cutter by the CCD1 defect detector, and performing real-time compensation on the milling cutter;

[0025] S3, fixing the circuit board to be repaired on the surface of the mounting plate through the fixture, controlling the operation of the X-axis moving mechanism, the Y-axis moving mechanism and the Z-axis moving mechanism through the PC motion card control module respectively, moving the mounting plate, the sliding plate and the H-shaped frame, moving the H-shaped frame to one side of the circuit board to be detected by the CCD1 defect detector, and obtaining the defect coordinates on the surface of the circuit board by the CCD1 defect detector;

[0026] S4, the CCD1 defect detector sends a signal to the PC motion card control module, the PCL control module automatically plans a repairing path, and controls the operation of the X-axis motor, the Y-axis motor and the Z-axis motor, and the X-axis moving mechanism, the Y-axis moving mechanism and the Z-axis moving mechanism respectively drive the mounting plate, the sliding plate and the H-shaped frame to move;

[0027] S5, the H-shaped frame drives the CCD2 defect detector to move, and the CCD2 defect detector detects the defect coordinates on the surface of the circuit board according to the planned path;

[0028] S6, after the CCD2 defect detector shoots the defect information, it is compared with the circuit board without defects to judge;

[0029] S7, if there is a defect on the surface of the circuit board, a signal is sent to the PC motion card control module, the X-axis moving mechanism, the Y-axis moving mechanism, the Z-axis moving mechanism and the main shaft assembly operate, and the milling cutter path is planned;

[0030] S8, the laser range finder measures the starting point of the cutter to determine the cutter depth.

[0031] S9, milling the defects on the surface of the circuit board by the milling cutter;

[0032] S10, after the repair is completed, the H-shaped frame is moved by the Z-axis moving mechanism controlled by the PC motion card control module, the CCD2 defect detector is driven by the H-shaped frame to recheck the repair effect of the surface of the circuit board after the milling is completed;

[0033] S11, the repair effect is judged by the CCD2 defect detector, and the output device is completed, and the defects still exist, and the S7 step operation is performed;

[0034] S12, after the repair of one defect position on the surface of the circuit board is completed, the S5 step is performed to repair another defect point on the surface of the circuit board;

[0035] S13, the length and diameter of the milling cutter are obtained by the CCD1 defect detector, and the milling cutter is compensated in real time.

[0036] Compared with the prior art, the beneficial effects of the present application are:

[0037] 1, in the present application, when the defective printed circuit board is repaired by the device, the defects on the surface of the circuit board are positioned by the CCD1 defect detector, the repair precision of the circuit board defects is improved, the repair effect of the circuit board is detected by the CCD2 defect detector after the milling cutter is used to mill and repair the surface of the circuit board, the surface of the repaired circuit board does not exist defects, the repair precision of the circuit board is ensured, and the repair efficiency of the printed circuit board is improved.

[0038] 2, in the present application, the shell in the main shaft assembly plays the role of installing the main shaft motor and the connecting shaft, the main shaft motor drives the connecting shaft connected to the output end to rotate when it operates, the milling cutter fixed at the lower end of the connecting shaft is driven to rotate by the connecting shaft, and the milling cutter is used for milling and repairing the surface of the circuit board.

[0039] 3, in the present application, the distance from the defect position on the surface of the circuit board to the milling cutter is measured by the laser range finder when it operates, the descending depth of the H-shaped frame driven by the Z-axis moving mechanism is determined, and the depth of the milling cutter is determined. DETAILED DESCRIPTION

[0040] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation to the present application. In the drawings:

[0041] Figure 1 It is a first perspective view of the present application;

[0042] Figure 2 It is a second perspective view of the present application;

[0043] Figure 3 is a third perspective view of the present application;

[0044] Figure 4 is a third perspective view of the present application; Figure 3 is a partial enlarged view of A in the present application;

[0045] Figure 5 is a front view of the present application;

[0046] Figure 6 is a third perspective view of the present application; Figure 5 is a partial enlarged view of B in the present application;

[0047] Figure 7 is a side view of the present application;

[0048] Figure 8 is a top view of the present application;

[0049] Figure 9 is a flow chart of the use of the present application.

[0050] In the figure: 1, marble base plate; 101, first guide rail; 102, mounting plate; 2, U-shaped frame; 201, second guide rail; 202, sliding plate; 3, Z-axis motor; 301, Z-axis screw; 302, third guide rail; 303, H-shaped frame; 4, main shaft assembly; 401, milling cutter; 5, laser range finder; 6, CCD1 defect detector; 7, CCD2 defect detector. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0052] Embodiment 1

[0053] Please refer to Figures 1-9 , the present application provides the following technical solutions:

[0054] An automatic defect repair device for printed circuit board products comprises:

[0055] The marble base plate 1;

[0056] The mounting plate 102 is arranged on the upper side of the marble base plate 1 through a Y-axis moving mechanism, and the movement of the mounting plate 102 is controlled through the Y-axis moving mechanism;

[0057] The U-shaped frame 2 is fixedly connected to the upper end of the marble base plate 1;

[0058] The sliding plate 202 is arranged on one side of the U-shaped frame 2 through the X-axis moving mechanism, and the movement of the sliding plate 202 is controlled through the X-axis moving mechanism;

[0059] The H-shaped frame 303 is arranged on one side of the sliding plate 202 through the Z-axis moving mechanism, and the movement of the H-shaped frame 303 is controlled through the Z-axis moving mechanism;

[0060] The main shaft assembly 4 is arranged in the H-shaped frame 303; and

[0061] The milling cutter 401 is connected with the main shaft assembly 4, and the operation of the milling cutter 401 is controlled through the main shaft assembly 4.

[0062] In the specific embodiment of the present application, the Y-axis moving mechanism is arranged in the marble base plate 1, the mounting plate 102 is moved by the operation of the Y-axis moving mechanism, a plurality of holes are uniformly arranged on the surface of the mounting plate 102, the clamps are arranged in the holes, and the defective printed circuit board is arranged on the upper side of the mounting plate 102 through the clamps; the clamp is a prior art and will not be described in detail here; the U-shaped frame 2 is fixed on the upper end of the marble base plate 1, the X-axis moving mechanism is arranged in the U-shaped frame 2, the sliding plate 202 is moved by the operation of the X-axis moving mechanism, the Z-axis moving mechanism is arranged on the surface of the sliding plate 202, the H-shaped frame 303 is moved by the Z-axis moving mechanism, the main shaft assembly 4 is arranged on the surface of the H-shaped frame 303, the milling cutter 401 is rotated by the main shaft assembly 4 during operation, the milling cutter 401 is in contact with the defective circuit board, and the defective circuit board is milled and repaired.

[0063] For details, please refer to Figures 1-9 The Y-axis moving mechanism includes a Y-axis motor, a Y-axis screw rod, two first guide rails 101 and a Y-axis threaded block, the two first guide rails 101 are fixedly connected to the upper end of the marble base plate 1, the mounting plate 102 is slidably connected to the surfaces of the two first guide rails 101, the Y-axis threaded block is fixedly connected to the lower end of the mounting plate 102, the Y-axis motor is fixedly connected in the marble base plate 1, one end of the Y-axis screw rod is fixedly connected to the output end of the Y-axis motor, the other end of the Y-axis screw rod is rotatably connected in the marble base plate 1, and the Y-axis screw rod is threadedly connected with the Y-axis threaded block.

[0064] In the embodiment, the Y-axis motor in the Y-axis moving mechanism drives the Y-axis screw rod connected with the output end to rotate during operation, the Y-axis screw rod is threadedly connected with the Y-axis threaded block fixedly connected to the lower end of the mounting plate 102, the mounting plate 102 is slid on the surfaces of the first guide rails 101 through the rotation of the Y-axis screw rod, and the mounting plate 102 drives the defective circuit board arranged on the surface thereof through the clamps to move.

[0065] For details, please refer to Figures 1-9The X-axis moving mechanism comprises an X-axis motor, an X-axis screw rod, an X-axis threaded block and two second guide rails 201. The two second guide rails 201 are fixedly connected to one side end of the U-shaped frame 2. A sliding plate 202 is slidingly connected to the surfaces of the two second guide rails 201. The X-axis threaded block is fixedly connected to one side end of the sliding plate 202. The X-axis motor is fixedly connected to the U-shaped frame 2. One end of the X-axis screw rod is fixedly connected to the output end of the X-axis motor. The other end of the X-axis screw rod is rotatably connected to the U-shaped frame 2. The X-axis screw rod is in threaded connection with the X-axis threaded block.

[0066] In this embodiment, the X-axis motor of the X-axis moving mechanism drives the X-axis screw rod fixed to the output end of the X-axis motor to rotate when in operation. The X-axis screw rod is in threaded connection with the X-axis threaded block fixed to one side end of the sliding plate 202. The sliding plate 202 is driven to slide on the surfaces of the two second guide rails 201 through the rotation of the X-axis screw rod.

[0067] For details, please refer to Figures 1-9 The Z-axis moving mechanism comprises a Z-axis motor 3, a Z-axis screw rod 301, a Z-axis threaded block and two third guide rails 302. The two third guide rails 302 are fixedly connected to the surface of the sliding plate 202. An H-shaped frame 303 is slidingly connected to the surfaces of the two third guide rails 302. The Z-axis motor 3 is fixedly connected to the upper end of the sliding plate 202. The Z-axis threaded block is fixedly connected to one side end of the H-shaped frame 303. One end of the Z-axis screw rod 301 is fixedly connected to the output end of the Z-axis motor 3. The other end of the Z-axis screw rod 301 is rotatably connected to the sliding plate 202. The Z-axis screw rod 301 is in threaded connection with the Z-axis threaded block.

[0068] In this embodiment, the Z-axis motor 3 of the Z-axis moving mechanism drives the Z-axis screw rod 301 fixed to the output end of the Z-axis motor 3 to rotate when in operation. The Z-axis screw rod 301 is in threaded connection with the Z-axis threaded block fixed to one side end of the H-shaped frame 303. The H-shaped frame 303 is driven to slide on the surfaces of the two third guide rails 302 through the rotation of the Z-axis screw rod 301.

[0069] For details, please refer to Figures 1-9 The spindle assembly 4 comprises a spindle motor, a connecting shaft and a shell. The shell is fixedly connected to one side end of the H-shaped frame 303. The spindle motor is fixedly connected to the upper inner wall of the shell. The connecting shaft is rotatably connected to the shell. One end of the connecting shaft is fixedly connected to the output end of the spindle motor. The other end of the connecting shaft is fixedly connected to the upper end of the milling cutter 401.

[0070] In this embodiment, the shell of the spindle assembly 4 serves to mount the spindle motor and the connecting shaft. The spindle motor drives the connecting shaft connected to the output end of the spindle motor to rotate when in operation. The connecting shaft drives the milling cutter 401 fixed to the lower end of the connecting shaft to rotate. The milling cutter 401 performs milling repair operation on the surface of the circuit board.

[0071] For details, please refer toFigures 1-9 The surface of the H-shaped frame 303 is fixedly connected with a laser range finder 5.

[0072] In this embodiment, the laser range finder 5 measures the distance from the surface defect of the circuit board to the milling cutter 401 when in operation, determines the descending depth of the H-shaped frame 303 driven by the Z-axis moving mechanism, and thus determines the descending depth of the milling cutter 401.

[0073] For details, please refer to Figures 1-9 The surface of the H-shaped frame 303 is fixedly connected with a CCD1 defect detector 6.

[0074] In this embodiment, the CCD1 defect detector 6 is arranged on one side of the milling cutter 401, and is signal connected with the PC motion card control module. The CCD1 defect detector 6 is used to acquire the length and diameter of the milling cutter 401, and compensate the milling cutter 401 according to the descending depth and rotating speed.

[0075] For details, please refer to Figures 1-9 The surface of the H-shaped frame 303 is fixedly connected with a CCD2 defect detector 7.

[0076] In this embodiment, the CCD2 defect detector 7 has multiple functions, one is to detect the defect coordinates of the surface of the circuit board according to the planned path, the second is to recheck the repair effect of the surface of the circuit board after milling, and the third is to judge the repair effect.

[0077] For details, please refer to Figures 1-9 The marble bottom plate 1 is provided with a PC motion card control module, which is signal connected with the X-axis motor, the Y-axis motor, the Z-axis motor and the main shaft motor, and controls the operation of the X-axis motor, the Y-axis motor, the Z-axis motor and the main shaft motor.

[0078] In this embodiment, the PC motion card control module controls the operation of the X-axis moving mechanism, the Y-axis moving mechanism, the Z-axis moving mechanism and the main shaft assembly 4. The electrical devices used in the device are all prior art, and thus will not be described in detail here.

[0079] The working principle and use process of the application are as follows: in use, the device is first initialized, the PC motion card control module controls the X-axis motor, Y-axis motor and Z-axis motor to reset, the X-axis motor, Y-axis motor and Z-axis motor control the operation of the X-axis moving mechanism, Y-axis moving mechanism and Z-axis moving mechanism respectively, and the mounting plate 102, sliding plate 202 and H-shaped frame 303 move to the initial position; the operation of the CCD1 defect detector 6 is controlled, the CCD1 defect detector 6 obtains the length diameter and other information of the milling cutter 401, and real-time compensation is performed on the milling cutter 401; the circuit board to be repaired is fixed on the surface of the mounting plate 102 through the fixture, the operation of the X-axis moving mechanism, Y-axis moving mechanism and Z-axis moving mechanism is controlled by the PC motion card control module respectively, the mounting plate 102, sliding plate 202 and H-shaped frame 303 move, the H-shaped frame 303 drives the CCD1 defect detector 6 to move to one side of the circuit board to be detected, and the defect coordinates on the surface of the circuit board are obtained by the CCD1 defect detector 6; the CCD1 defect detector 6 sends a signal to the PC motion card control module, the PC control module automatically plans a repair path, and controls the operation of the X-axis motor, Y-axis motor and Z-axis motor, the X-axis moving mechanism, Y-axis moving mechanism and Z-axis moving mechanism drive the mounting plate 102, sliding plate 202 and H-shaped frame 303 to move respectively; the H-shaped frame 303 drives the CCD2 defect detector 7 to move, and the CCD2 defect detector 7 detects the defect coordinates on the surface of the circuit board according to the planned path; after the CCD2 defect detector 7 shoots the defect information, it is compared with the circuit board without defects to judge whether there is a defect on the surface of the circuit board; if there is a defect on the surface of the circuit board, a signal is sent to the PC motion card control module, the X-axis moving mechanism, Y-axis moving mechanism, Z-axis moving mechanism and main shaft assembly operate, and the milling cutter 401 is planned to move; the starting point of the milling cutter 401 is measured by the laser range finder 5, and the depth of the milling cutter 401 is determined; the milling cutter 401 operates to mill and repair the defects on the surface of the circuit board; after the repair is completed, the H-shaped frame 303 is moved by the PC motion card control module through the Z-axis moving mechanism, the H-shaped frame 303 drives the CCD2 defect detector 7 to recheck the repair effect on the surface of the circuit board after milling; the repair effect is judged by the CCD2 defect detector 7, and if the repair is completed, the device is output, and if there is still a defect, the S7 step operation is performed; after one defect position on the surface of the circuit board is repaired, the S5 step is performed to repair another defect position on the surface of the circuit board; when the defective printed circuit board is repaired by the device, the defects on the surface of the circuit board are positioned by the CCD1 defect detector 6, the defect repair precision of the circuit board is improved, the repair effect of the circuit board is detected by the CCD2 defect detector 7 after the milling and repair of the circuit board surface are completed, there is no defect on the surface of the circuit board after the repair is completed, the repair precision of the circuit board is ensured, and the repair efficiency of the printed circuit board is improved.

[0080] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for automatic repair of defects in printed wiring board products, characterized by, The application relates to a printed circuit board product defect automatic repairing device. A marble base plate (1) is internally provided with a PC motion card control module, the PC motion card control module is signal-connected with X-axis motor, Y-axis motor, Z-axis motor and main shaft motor respectively, and the operation of the X-axis motor, the Y-axis motor, the Z-axis motor and the main shaft motor is controlled respectively; An installation plate (102) is arranged on the upper side of the marble base plate (1) through a Y-axis moving mechanism, and the movement of the installation plate (102) is controlled through the Y-axis moving mechanism; A U-shaped frame (2) is fixedly connected to the upper end of the marble base plate (1); A sliding plate (202) is arranged on one side of the U-shaped frame (2) through an X-axis moving mechanism, and the movement of the sliding plate (202) is controlled through the X-axis moving mechanism; An H-shaped frame (303) is arranged on one side of the sliding plate (202) through a Z-axis moving mechanism, and the movement of the H-shaped frame (303) is controlled through the Z-axis moving mechanism, and the surface of the H-shaped frame (303) is fixedly connected with a laser range finder (5), a CCD1 defect detector (6) and a CCD2 defect detector (7); A main shaft assembly (4) is arranged in the H-shaped frame (303); and A milling cutter (401) is connected with the main shaft assembly (4), and the operation of the milling cutter (401) is controlled through the main shaft assembly (4); The method for repairing defects of a printed circuit board product automatically comprises the following steps: S1, initializing the equipment, controlling the PC motion card control module to control the X-axis motor, the Y-axis motor and the Z-axis motor to reset, so that the X-axis motor, the Y-axis motor and the Z-axis motor control the operation of the X-axis moving mechanism, the Y-axis moving mechanism and the Z-axis moving mechanism respectively, the installation plate (102), the sliding plate (202) and the H-shaped frame (303) are moved to the initial zero position, and the absolute position data of the PC upper computer software is interconnected and interlocked to form a three-axis coordinate system; S2, the operation of the CCD1 defect detector (6) is controlled, the length diameter of the milling cutter (401) is acquired by the CCD1 defect detector (6), and real-time compensation is carried out on the milling cutter (401) during repairing; S3, the circuit board to be repaired is fixed on the surface of the installation plate (102) through a fixture, the operation of the X-axis moving mechanism, the Y-axis moving mechanism and the Z-axis moving mechanism is controlled through the PC motion card control module, the installation plate (102), the sliding plate (202) and the H-shaped frame (303) are moved, the CCD1 defect detector (6) is moved to one side of the circuit board to be detected by the H-shaped frame (303), and the defect coordinates of the surface of the circuit board are acquired by the CCD1 defect detector (6). S4, the CCD1 defect detector (6) sends a signal to the PC motion card control module, the PCL control module automatically plans a repair path, and controls the X-axis motor, Y-axis motor and Z-axis motor to operate, and the X-axis moving mechanism, Y-axis moving mechanism and Z-axis moving mechanism respectively drive the mounting plate (102), sliding plate (202) and H-shaped frame (303) to move; S5, the H-shaped frame (303) drives the CCD2 defect detector (7) to move, and the CCD2 defect detector (7) detects the defect coordinates on the surface of the circuit board according to the planned path; S6, after the CCD2 defect detector (7) shoots the defect information, it is compared with the original production data Gerber or ODB++ layer data to judge; S7, if the circuit board surface has defects, a signal is sent to the PC motion card control module, the X-axis moving mechanism, Y-axis moving mechanism, Z-axis moving mechanism and main shaft assembly operate, and the milling cutter (401) is planned to move; S8, the laser range finder (5) measures the starting point of the cutter, and determines the cutter depth; S9, the milling cutter (401) operates to mill the defects on the surface of the circuit board; S10, after the repair is completed, the PC motion card control module controls the H-shaped frame (303) to move through the Z-axis moving mechanism, and the H-shaped frame (303) drives the CCD2 defect detector (7) to recheck the repair effect of the milled circuit board surface; S11, the CCD2 defect detector (7) judges the repair effect, and if it is completed, the output device is output, and if there are still defects, the S7 step is operated; S12, after the repair of one defect position on the surface of the circuit board is completed, the S5 step is performed to repair another defect point on the surface of the circuit board; S13, the CCD1 defect detector (6) obtains the length and diameter of the milling cutter (401), and compensates the milling cutter (401) in real time.

2. A method for automatic defect repair of printed wiring board products as claimed in claim 1, wherein: The Y-axis moving mechanism comprises a Y-axis motor, a Y-axis screw, a first guide rail (101) and a Y-axis threaded block, the first guide rail (101) is provided with two, both of the two first guide rails (101) are fixedly connected to the upper end of the marble bottom plate (1), the mounting plate (102) is slidably connected to the surface of the two first guide rails (101), the Y-axis threaded block is fixedly connected to the lower end of the mounting plate (102), the Y-axis motor is fixedly connected in the marble bottom plate (1), one end of the Y-axis screw is fixedly connected to the output end of the Y-axis motor, the other end of the Y-axis screw is rotatably connected in the marble bottom plate (1), and the Y-axis screw is in threaded connection with the Y-axis threaded block.

3. A method for automatic defect repair of printed wiring board products as defined in claim 2 wherein: The X-axis moving mechanism comprises an X-axis motor, an X-axis screw rod, an X-axis threaded block and two second guide rails (201), the two second guide rails (201) are fixedly connected to one side end of the U-shaped frame (2), the sliding plate (202) is slidably connected to surfaces of the two second guide rails (201), the X-axis threaded block is fixedly connected to one side end of the sliding plate (202), the X-axis motor is fixedly connected to the U-shaped frame (2), one end of the X-axis screw rod is fixedly connected to an output end of the X-axis motor, the other end of the X-axis screw rod is rotatably connected to the U-shaped frame (2), and the X-axis screw rod is in threaded connection with the X-axis threaded block.

4. A method for automatic defect repair of printed wiring board products as defined in claim 3 wherein: The Z-axis moving mechanism comprises a Z-axis motor (3), a Z-axis screw rod (301), a Z-axis threaded block and two third guide rails (302), the two third guide rails (302) are fixedly connected to surfaces of the sliding plate (202), the H-shaped frame (303) is slidably connected to surfaces of the two third guide rails (302), the Z-axis motor (3) is fixedly connected to the upper end of the sliding plate (202), the Z-axis threaded block is fixedly connected to one side end of the H-shaped frame (303), one end of the Z-axis screw rod (301) is fixedly connected to an output end of the Z-axis motor (3), the other end of the Z-axis screw rod (301) is rotatably connected to the sliding plate (202), and the Z-axis screw rod (301) is in threaded connection with the Z-axis threaded block.

5. A method for automatic defect repair of printed wiring board products as defined in claim 4 wherein: The spindle assembly (4) comprises a spindle motor, a connecting shaft and a shell, the shell is fixedly connected to one side end of the H-shaped frame (303), the spindle motor is fixedly connected to the upper inner wall of the shell, the connecting shaft is rotatably connected to the shell, one end of the connecting shaft is fixedly connected to an output end of the spindle motor, and the other end of the connecting shaft is fixedly connected to the upper end of the milling cutter (401).

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