Jig for CNC machining of side holes of notebook computer

Abstract

The utility model discloses a notebook computer side hole CNC machining jig which comprises a base capable of being fixed to CNC equipment, a lower die assembly arranged at the top end of the base and an upper die assembly connected to a lower back plate. The lower die assembly comprises a lower die base connected with the base, a lower back plate with the bottom end perpendicularly connected with the lower die base, a bearing part arranged at the top end of the lower back plate, used for bearing a workpiece and provided with a through hole, a positioning pin arranged in the through hole in a penetrating mode and a driving mechanism connected with the positioning pin and used for driving the positioning pin to enter / exit the through hole. The upper die assembly comprises a first driving unit connected with the lower back plate, a pressing and holding plate connected with the first driving unit and an avoiding cavity formed in the pressing and holding plate and corresponding to the penetrating hole in position, and the first driving unit can drive the pressing and holding plate to move in the direction close to the bearing part so as to press and hold a workpiece; the first driving unit can further drive the pressing plate to move in the direction away from the bearing part, workpiece clamping can be automatic, the position consistency is high, and the side hole machining precision can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to notebook computer shell piece processing technical field, concretely relates to a notebook computer side hole CNC processing jig. BACKGROUND

[0002] The face shell workpiece of notebook computer shell piece setting keyboard is C piece, and the workpiece forming has side wall perpendicular to the keyboard face. One or more side holes penetrating the side wall are arranged in some C piece side wall, and the side hole usually needs to be chamfered by CNC equipment. The jig is an essential tool for keeping the workpiece in correct relative position during CNC processing, so it is very necessary to design a jig specially used for C piece side hole CNC processing and capable of ensuring the precision and consistency of product processing. SUMMARY

[0003] In view of the technical problems existing in the prior art, the utility model provides a notebook computer side hole CNC processing jig.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A notebook computer side hole CNC processing jig, comprising:

[0006] The base can be fixed on the CNC equipment;

[0007] The lower die assembly is arranged at the top end of the base, and the lower die assembly comprises a lower die seat which is detachably connected with the base, a lower back plate which is vertically connected with the lower die seat at the bottom end, a bearing part which is arranged at the top end of the lower back plate and used for bearing the workpiece and also provided with a through hole, a positioning pin which is arranged in the through hole, and a driving mechanism which is connected with the positioning pin and used for driving the positioning pin to enter / exit the through hole;

[0008] The upper die assembly is detachably connected with the lower back plate, and the upper die assembly comprises a first driving unit which is connected with the lower back plate, a pressing plate which is connected with the first driving unit, and a avoiding cavity which is arranged on the pressing plate and corresponds to the position of the through hole. The first driving unit can drive the pressing plate to move towards the direction close to the bearing part to press the workpiece to be processed, and the first driving unit can also drive the pressing plate to move away from the bearing part.

[0009] Further, the lower back plate comprises a main plate body which is screwed with the lower die seat, and a sub plate body which is screwed at the top end of the main plate body. Part of the top wall of the sub plate body protrudes towards the direction close to the pressing plate to form the bearing part.

[0010] Further, the jig further comprises a guide assembly, the guide assembly comprises a plurality of guide rods connected with the top surface of the board separating body and arranged in intervals, and a plurality of sleeve holes opened on the pressing plate and corresponding to the guide rods, the guide rods are sleeved in the sleeve holes, and the pressing plate can reciprocate along the height direction of the guide rods.

[0011] Further, the main plate body is provided with a through cavity, an installation groove for installing the driving mechanism is arranged on one side of the through cavity, the driving mechanism comprises a second driving unit arranged in the installation groove, a connecting seat connected with the top end of the second driving unit and distributed below the board separating body, and a connecting block connected with the positioning pin on one side and connected with the connecting seat on the other side, the second driving unit can drive the connecting seat to reciprocate in the installation groove, when the connecting seat moves towards the board separating body, the positioning pin can be extended from the through hole and into the avoiding cavity, and when the connecting seat moves away from the board separating body, the positioning pin can be retracted into the through hole.

[0012] Further, the contact surface of the main plate body in contact with the workpiece is provided with a recessed groove for installing a suction cup, and the end surface away from the contact surface is connected with a plurality of reinforcing blocks, the first end surface of the reinforcing block is screwed with the main plate body through bolts, the second end of the reinforcing block is screwed with the lower die seat through bolts, and each reinforcing block is provided with a weight-reducing cavity penetrating through the reinforcing block.

[0013] Further, the bottom surface of the pressing plate is provided with a pressing part recessed towards the direction away from the bottom end, and the pressing part is covered with a flexible pad capable of contacting the workpiece.

[0014] Further, the pressing part and the flexible pad are both provided with avoiding positions, the avoiding positions of the pressing part and the flexible pad can overlap with each other in the top view to form the avoiding cavity, a variable-diameter cavity with a gradually decreasing cross-sectional area from the top end to the bottom end is further arranged on the top surface of the pressing plate, and the top end of the variable-diameter cavity is distributed on the top surface of the pressing plate, and the bottom end is communicated with the avoiding cavity.

[0015] Further, the bottom end of the pressing plate is screwed with a connecting piece, when the pressing plate holds the workpiece, the connecting piece is located on one side of the board separating body, the bottom end of the connecting piece is connected with the first driving unit, the first driving unit is connected with the main plate body, two supporting blocks are screwed on the board separating body and located on both sides of the first driving unit, and when the first driving unit drives the pressing plate to move towards the direction close to the bearing part, the bottom surface of the pressing plate can contact with the top surface of the supporting block.

[0016] Further, the base comprises a seat plate and a plurality of support columns arranged at the top end of the seat plate, wherein at least two of the support columns are defined as positioning columns, the top surface of each positioning column is fixedly connected with a positioning pin, and the lower die seat is provided with a positioning hole capable of being inserted with the positioning pin at the corresponding position; the remaining support columns are defined as connecting columns, the top surface of each connecting column is provided with a connecting cavity, and the lower die seat is also provided with a connecting hole at the corresponding position, and the lower die seat and the connecting column are connected and fixed through screwing of a bolt with the connecting hole and the connecting cavity.

[0017] Further, the top surface of each connecting column is provided with an annular groove concentrically distributed with the connecting cavity, and the side wall of the connecting column is provided with an air source through hole capable of communicating with the connecting cavity.

[0018] In summary, the beneficial effects of the present utility model are as follows: 1. The present utility model is designed for chamfering the side hole on the side wall, the pressing plate of the upper die assembly is driven by the first driving unit, and the pressing plate is away from the bearing part to facilitate placing the workpiece, and the pressing plate is close to the bearing part to fasten the workpiece, so that the clamping process is simple and efficient, and the degree of automation is high. After fastening the workpiece, before processing, the driving mechanism drives the positioning pin to enter the inside of the through hole, so that interference caused by processing the side hole is avoided, and processing is ensured to be carried out smoothly. The driving mechanism adopts the second driving unit to control the reciprocating movement of the positioning pin in the through hole, so that automatic operation is realized, and manpower and time are saved. 2. The bearing part of the lower die assembly is adapted to the shape of the side wall of the workpiece, and the positioning pin is inserted into the side hole, so that precise positioning is realized, the deviation of the clamping position is reduced, and the processing precision and consistency of the product are ensured. 3. The base can be quickly disassembled with the lower die seat through the positioning pin and the connecting cavity, and can be universal with other jigs, and after the base is installed with other jigs, the base can be fixed through negative pressure adsorption, so that the universality of the base is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of a notebook side hole CNC machining jig provided by the present utility model.

[0020] Figure 2 is Figure 1 a top view.

[0021] Figure 3 is Figure 2 an A-A sectional view in the

[0022] Figure 4 is a three-dimensional structural schematic view of the rear end of the lower die assembly in the present utility model.

[0023] Figure 5 is a three-dimensional structural schematic view of the base in the present utility model.

[0024] Figure 6 is a side view of the base connected with the lower die assembly in the present utility model.

[0025] Figure 7 is the top view of the bearing part in the utility model.

[0026] Figure 8 is Figure 7 the top view of the bearing part after bearing the workpiece.

[0027] Figure 9 is the three-dimensional structure schematic diagram of the utility model after fastening the workpiece.

[0028] In the figure, 100-base, 110-seat plate, 120-positioning column, 121-positioning bolt, 130-connection column, 131-connection cavity, 132-annular groove, 133-air source through hole, 200-lower die assembly, 210-lower die seat, 220-lower back plate, 221-main plate body, 2210-penetration cavity, 2211-recessed groove, 2212-strengthening block, 2212A-weight reduction cavity, 2213-avoidance groove, 222-division plate body, 2220-supporting block, 230-bearing part, 240-positioning pin, 250-driving mechanism, 251-second driving unit, 252-connection seat, 253-connection block, 300-upper die assembly, 310-first driving unit, 320-pressing plate, 321-flexible pad, 322-variable diameter cavity, 323-connection piece, 330-avoidance position, 400-guide rod, 500-workpiece, 510-side wall. DETAILED DESCRIPTION

[0029] The utility model is further described below in combination with specific drawings.

[0030] Please refer to Figure 1 The utility model provides a notebook side hole CNC processing jig, including the base 100 that can be fixed on the CNC equipment, the lower die assembly 200 that can be detachably connected in the top end of base 100 and the upper die assembly 300 that can be detachably connected on lower back plate 220. Figure 3 Lower die assembly 200 includes the lower die seat 210 that is detachably connected with base 100, the lower back plate 220 that is vertically connected with lower die seat 210 at bottom end, the bearing part 230 that is arranged at the top end of lower back plate 220 for bearing workpiece and still is provided with perforation, the positioning pin 240 that is threaded in the perforation and the driving mechanism 250 that is connected with positioning pin 240 for driving positioning pin 240 in / out the perforation, please refer to Figure 7, the shape of the bearing part 230 is matched with the shape of the side wall 510 of the workpiece 500. The upper die assembly 300 comprises a first driving unit 310 connected with the lower back plate 220, a pressing plate 320 connected with the first driving unit 310, and a avoiding cavity arranged on the pressing plate 320 and corresponding to the through hole position, the first driving unit 310 can drive the pressing plate 320 to move towards the direction close to the bearing part 230 to press the workpiece to be processed, please refer to Figure 2 , the avoiding cavity is used to avoid the position of the positioning pin 240 during pressing, and the first driving unit 310 can also drive the pressing plate 320 to move away from the bearing part 230. The first driving unit 310 preferably adopts a pneumatic cylinder, when the first driving unit 310 drives the pressing plate 320 to move away from the bearing part 230, it is convenient to place the side wall 510 at the position of the bearing part 230, and the positioning pin 240 extending from the through hole is arranged in the side hole to position the workpiece, the first driving unit 310 drives the pressing plate 320 to move towards the direction close to the workpiece, please refer to Figure 9 , until the pressing plate 320 is pressed against the side wall 510 to cooperate with the bearing part 230 to fasten the workpiece 500, before the CNC equipment processes, the driving mechanism 250 drives the positioning pin 240 to move, so that the positioning pin 240 can enter the inside of the through hole to avoid interference of the positioning pin 240 to the side hole, to ensure the smooth processing, and the CNC equipment can be started to process the chamfer of the side hole. The shape of the bearing part 230 of the lower die assembly 200 is matched with the shape of the side wall 510 of the workpiece 500, and the positioning pin 240 and the driving mechanism 250 are arranged, please refer to Figure 8 , it is convenient to place the side wall 510 of the workpiece 500 at the bearing part 230, and the positioning pin 240 is arranged in the side hole for accurate positioning; the pressing plate 320 of the upper die assembly 300 is driven by the first driving unit 310, and it is convenient to place the workpiece 500 when the pressing plate 320 moves away from the bearing part 230, and the workpiece 500 can be fastened by the cooperation of the pressing plate 320 and the bearing part 230 when the pressing plate 320 moves close to the bearing part 230, the clamping process is simple and efficient, the degree of automation is high, the clamping position deviation can be reduced, and the precision and consistency of product processing are guaranteed.

[0031] Please refer to Figure 5The base 100 comprises a seat plate 110 and a plurality of support columns arranged on the top end of the seat plate 110, wherein at least two of the support columns are defined as positioning columns 120, the top surface of each positioning column 120 is fixedly connected with a positioning pin 121, and the lower die seat 210 is provided with a positioning hole capable of being inserted with the positioning pin 121 at a corresponding position. The remaining support columns are defined as connecting columns 130, the top surface of each connecting column 130 is provided with a connecting cavity 131, and the lower die seat 210 is also provided with a connecting hole at a corresponding position, and the lower die seat 210 and the connecting column 130 can be connected and fixed by being screwed with the connecting hole and the connecting cavity 131. The top surface of each connecting column 130 is provided with an annular groove 132 concentrically distributed with the connecting cavity 131, and the side wall of the connecting column 130 is provided with an air source through hole 133 capable of communicating with the connecting cavity 131. The bottom surface of the seat plate 110 is provided with a connecting through hole capable of being clamped or screwed with the CNC equipment, the lower die seat 210 is screwed and fixed with the seat plate 110, and the disassembly and assembly are convenient and fast. Moreover, after the mold assembly 200 is disassembled, the base 100 can also be used with other jigs, a sealing ring is embedded in the annular groove 132, the air source is connected from the position of the air source through hole 133, the other jig is first positioned through the positioning pin 121, and then the other jig is adsorbed and fixed through negative pressure in the connecting cavity 131, and the base 100 has high versatility.

[0032] The lower back plate 220 comprises a main plate body 221 screwed with the lower die seat 210 and a split plate body 222 screwed on the top end of the main plate body 221, part of the top wall of the split plate body 222 protrudes towards the direction close to the pressing plate 320 to form a bearing part 230, and the bearing part 230 protrudes from the split plate body 222 to facilitate loading of the workpiece 500 on the bearing part 230.

[0033] The main plate body 221 is provided with a through cavity 2210, and an installation recess for installing the driving mechanism 250 is arranged on one side of the through cavity 2210. The driving mechanism 250 comprises a second driving unit 251 arranged in the installation recess, a connecting seat 252 connected to the top end of the second driving unit 251 and distributed below the sub-plate body 222, and a connecting block 253 connected to the positioning pin 240 on one side and clamped to the connecting seat 252 on the other side. The second driving unit 251 can drive the connecting seat 252 to move reciprocatingly in the installation recess. When the connecting seat 252 moves towards the sub-plate body 222, the positioning pin 240 can be extended from the through hole, and when the workpiece is pressed, the positioning pin 240 can also enter the avoiding cavity. When the connecting seat 252 moves away from the sub-plate body 222, the positioning pin 240 can be withdrawn into the through hole, so that the positioning pin 240 does not interfere with the chamfering of the side hole. The second driving unit 251 is preferably a pneumatic cylinder, and the through cavity is used for passing a gas pipe connected to the pneumatic cylinder. The movement of the connecting seat 252 is controlled by the second driving unit 251, so that the positioning pin 240 is driven to move reciprocatingly in the through hole. After the positioning pin 240 is extended from the through hole, it is used for positioning with the side hole. When the CNC machining is performed, the positioning pin 240 is driven to be withdrawn (into) the through hole, so that the machining area is exposed, the machining is normally performed, the movement of the positioning pin 240 can be automatically controlled, the operation is convenient, and the manpower and time are saved.

[0034] Please continue to refer to Figure 1 The contact surface of the main plate body 221 in contact with the workpiece 500 is provided with a recessed groove 2211 for installing a suction cup. If the stability of the workpiece 500 is not enough, a suction cup can be installed in the recessed groove 2211, and the negative pressure is connected through the suction cup, so that the keyboard surface of the C workpiece is adsorbed, the workpiece 500 is further fastened, and the machining is facilitated. When the end surface of the C workpiece in contact with the contact surface has a protruding part, an avoiding recess 2213 for avoiding the protruding part can be arranged at the corresponding position of the contact surface of the main plate body 221.

[0035] Please refer to Figure 4 and Figure 6The end face of the main plate body 221 away from the contact surface is connected with a plurality of reinforcing blocks 2212. The first end face of the reinforcing block 2212 is screwed with the main plate body 221 by bolts, and the second end of the reinforcing block 2212 is screwed with the lower die seat 210 by bolts. Each reinforcing block 2212 is provided with a weight-reducing cavity 2212A penetrating the reinforcing block 2212. The reinforcing block 2212 is equivalent to a reinforcing rib connected between the lower back plate 220 and the lower die seat 210, so that the connection between the lower back plate 220 and the lower die seat 210 is more firm, ensuring the stability of the jig structure during processing, avoiding loosening of the connection between the lower back plate 220 and the lower die seat 210 due to vibration and other factors, and affecting the processing precision. The weight-reducing cavity 2212A penetrates the reinforcing block 2212, which can effectively reduce the weight of the reinforcing block 2212, and further reduce the weight of the entire jig. The jig is more convenient during installation, disassembly and transportation, reducing the labor intensity of the operator. The weight reduction of the jig also helps the CNC equipment to operate more stably during operation, reduces the additional burden on the equipment caused by the jig being too heavy, reduces the vibration and wear generated during equipment operation, and prolongs the service life of the equipment.

[0036] Please refer to Figure 9 The bottom surface of the pressing plate 320 is provided with a pressing portion recessed away from the bottom end direction, and the pressing portion is located corresponding to the position of the bearing portion 230. The flexible pad 321 capable of contacting the workpiece 500 is covered at the position of the pressing portion. The flexible pad 321 is preferably made of silica gel. When the first driving unit 310 drives the pressing plate 320 to approach the bearing portion 230 to press the workpiece 500, the flexible pad 321 contacts the workpiece 500. The flexible contact surface can avoid damaging the thin workpiece 500 during pressing.

[0037] Please continue to refer to Figure 3 The pressing portion and the flexible pad 321 are both provided with an avoiding position 330. The avoiding positions 330 on the pressing portion and the flexible pad 321 can overlap each other on the top view projection plane to form an avoiding cavity. The avoiding cavity is used to avoid the position of the positioning pin 240 before the positioning pin 240 is withdrawn into the hole.

[0038] Before installing the jig, manual debugging of the machine is required. The top surface of the pressing plate 320 is also provided with a variable-diameter cavity 322 with a gradually decreasing cross-sectional area from the top end to the bottom end. The top end of the variable-diameter cavity 322 is distributed on the top surface of the pressing plate 320, and the bottom end is communicated with the avoiding cavity. Such variable-diameter cavity 322 can widen the field of view of the worker, facilitating observation of whether the cooperation position of the avoiding cavity in the pressing plate 320 and the positioning pin 240 is deviated.

[0039] Please continue to refer to Figure 4, the bottom end of the pressing plate 320 is screwed with a connecting piece 323, when the pressing plate 320 holds the workpiece 500, the connecting piece 323 is located on one side of the split plate body 222, the bottom end of the connecting piece 323 is connected with the first driving unit 310, the first driving unit 310 is connected with the main plate body 221, two support blocks 2220 are screwed on the split plate body 222 and located on both sides of the first driving unit 310. When the first driving unit 310 drives the pressing plate 320 to move towards the direction close to the bearing part 230, the bottom surface of the pressing plate 320 can be in contact with the top surface of the support block 2220. Because the connecting position of the connecting piece 323 and the pressing plate 320 is not in the center of the pressing plate 320, the stress point of the pressing plate 320 is eccentric when it is pressed tightly, and the service life of the first driving unit 310 will be affected after a long time of use. In order to prolong the service life of the first driving unit 310, the support blocks 2220 located on both sides of the first driving unit 310 can provide support when the pressing plate 320 is pressed tightly, so that the stress of the pressing plate 320 is more balanced, which helps to prolong the service life of the first driving unit 310.

[0040] The jig also includes a guide assembly, the guide assembly includes a plurality of guide rods 400 connected with the top surface of the split plate body 222 and arranged at intervals, and a sleeve hole opened on the pressing plate 320 and corresponding to the guide rods 400, the guide rods 400 are sleeved in the sleeve hole, and the pressing plate 320 can reciprocate along the height direction of the guide rods 400. Through the cooperation of the guide rods 400 and the sleeve hole, the moving direction of the pressing plate 320 is guided, which is convenient for keeping the pressing position of the pressing plate 320 consistent.

[0041] The CNC machining jig; one, designed for chamfering the side hole on the side wall 510, the pressing plate 320 of the upper die assembly 300 is driven by the first driving unit 310, far away from the bearing part 230 to put the workpiece 500, close to fasten the workpiece 500 with the bearing part 230, the clamping process is simple and efficient, and the degree of automation is high. After fastening the workpiece 500, before processing, the driving mechanism 250 drives the positioning pin 240 to enter the inside of the through hole, avoiding interference with the processing of the side hole, ensuring smooth processing. The driving mechanism 250 adopts the second driving unit 251 to control the reciprocating movement of the positioning pin 240 in the through hole, realizing automatic operation and saving manpower and time. Two, the bearing part 230 of the lower die assembly 200 is matched with the shape of the side wall 510 of the workpiece 500, and the positioning pin 240 is inserted into the side hole to realize accurate positioning, reduce the deviation of clamping position, and ensure the processing precision and consistency of the product. Three, the base 100 can be quickly disassembled with the lower die seat 210 through the positioning pin 121 and the connecting cavity 131, and can be used with other jigs, and after installing other jigs, it can be fixed by negative pressure adsorption, improving the universality of the base 100.

[0042] The above is only the implementation manner of the present utility model, and does not limit the patent range of the present utility model, and any equivalent structure, direct or indirect application in other related technical fields by using the content of the present utility model specification and drawings are also within the patent protection range of the present utility model.

Claims

1. A jig for notebook side hole CNC processing, characterized by, The utility model relates to a CNC device's lower die assembly and upper die assembly, including: The base can be fixed on the CNC equipment; The lower die assembly is located at the top of the base, and the lower die assembly includes a lower die seat that is detachably connected with the base, a lower back plate that is vertically connected with the lower die seat at the bottom end, a bearing part that is provided at the top of the lower back plate and is used for bearing a workpiece and is also provided with a through hole, a positioning pin that is inserted into the through hole, and a driving mechanism that is connected with the positioning pin and is used for driving the positioning pin to move in and out of the through hole; The upper die assembly is detachably connected with the lower back plate, and the upper die assembly includes a first driving unit that is connected with the lower back plate, a pressing plate that is connected with the first driving unit, and a avoiding cavity that is provided on the pressing plate and corresponds to the position of the through hole, the first driving unit can drive the pressing plate to move towards the bearing part to press the workpiece to be processed, and the first driving unit can also drive the pressing plate to move away from the bearing part.

2. The jig for CNC machining of a notebook side hole according to claim 1, characterized by: The lower back plate includes a main plate body that is screwed with the lower die seat and a split plate body that is screwed with the top end of the main plate body, and part of the top surface of the split plate body protrudes towards the pressing plate to form the bearing part.

3. The jig for CNC machining of a notebook side hole according to claim 2, characterized by: It also includes a guide assembly, the guide assembly includes a plurality of guide rods that are connected with the top surface of the split plate body and are arranged at intervals, and a sleeve hole that is provided on the pressing plate and corresponds to the position of the guide rod, the guide rod is sleeved in the sleeve hole, and the pressing plate can reciprocate along the height direction of the guide rod.

4. The jig for CNC machining of a notebook side hole according to claim 2, characterized by: The main plate body is provided with a through cavity, and the through cavity is provided with a mounting groove on one side for mounting the driving mechanism, the driving mechanism includes a second driving unit that is provided in the mounting groove, a connecting seat that is connected with the top end of the second driving unit and is distributed below the split plate body, and a connecting block that is connected with the positioning pin on one side and is connected with the connecting seat on the other side, the second driving unit can drive the connecting seat to reciprocate in the mounting groove, when the connecting seat moves towards the split plate body, the positioning pin can be extended from the through hole and into the avoiding cavity, and when the connecting seat moves away from the split plate body, the positioning pin can be retracted into the through hole.

5. The jig for CNC machining of a notebook side hole according to claim 2, characterized by: The contact surface of the main plate body that contacts the workpiece is provided with a recessed groove for mounting a suction cup, and the end surface away from the contact surface is connected with a plurality of reinforcing blocks, the first end surface of the reinforcing block is screwed with the main plate body through bolts, the second end of the reinforcing block is screwed with the lower die seat through bolts, and each reinforcing block is provided with a weight-reducing cavity that penetrates through the reinforcing block.

6. The jig for CNC machining of a notebook side hole according to claim 2, characterized by: The bottom surface of the pressing plate is provided with a pressing part that is recessed away from the bottom end, and the pressing part is covered with a flexible pad that can contact the workpiece.

7. The jig for CNC machining of a notebook side hole according to claim 6, characterized by: The pressing part and the flexible pad are both provided with avoiding positions, the avoiding positions of the pressing part and the flexible pad can overlap each other in the top view to form the avoiding cavity, and the top surface of the pressing plate is also provided with a variable-diameter cavity that gradually decreases in cross-sectional area from the top end to the bottom end, and the variable-diameter cavity is distributed on the top surface of the pressing plate and is communicated with the avoiding cavity at the bottom end.

8. The jig for CNC machining of a notebook side hole according to claim 6, characterized by: The bottom end of the pressing plate is screwed with a connecting piece, when the pressing plate holds the workpiece, the connecting piece is located at one side of the sub-plate body, the bottom end of the connecting piece is connected with the first driving unit, the first driving unit is connected with the main plate body, two support blocks are screwed on the sub-plate body and located at two sides of the first driving unit respectively, when the first driving unit drives the pressing plate to move towards the direction of approaching the bearing part, the bottom surface of the pressing plate can contact with the top surface of the support block.

9. The jig for notebook side hole CNC machining according to any one of claims 1-8, characterized in that: The base comprises a seat plate and a plurality of support columns arranged at the top end of the seat plate, wherein at least two of the support columns are defined as positioning columns, the top surface of each positioning column is fixedly connected with a positioning plug, and the lower die seat is provided with a positioning hole at the corresponding position, which can be plugged with the positioning plug; the remaining support columns are defined as connecting columns, the top surface of each connecting column is provided with a connecting cavity, and the lower die seat is also provided with a connecting hole at the corresponding position, and the lower die seat and the connecting column can be connected and fixed through the screwing of the connecting hole and the connecting cavity.

10. The jig for CNC machining of a notebook side hole according to claim 9, characterized by: The top surface of each connecting column is provided with an annular groove concentrically distributed with the connecting cavity, and the side wall of the connecting column is provided with an air source through hole communicated with the connecting cavity.

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