Rapid positioning and clamping tool and method for machine tool suitable for irregular part machining

Abstract

The invention relates to the technical field of part machining, in particular to a quick positioning and clamping tool and method for a machine tool suitable for irregular part machining, and the quick positioning and clamping tool comprises a base, and a bolt connecting piece is fixedly installed on the side wall of the base through a bolt. The piston rod is controlled by the self-adaptive attaching assembly to perform multi-point clamping on the part, so that the part can be quickly positioned, the universality of the clamping tool is improved, the cost consumption caused by clamp replacement is reduced, and the machining efficiency of the part is improved; the piston rod is rapidly kept flush and restored to the initial position through the piston reset assembly, the next round of clamping and machining are facilitated, the clamping efficiency is improved, and then the machining efficiency is improved; and the positions of the parts clamped by the sliding seat and the top of the machining table are precisely adjusted through the position adjusting assembly, the machining precision is improved, and then the finished product rate and the qualified rate of part machining are improved.

Description

Technical Field

[0001] This invention relates to the field of parts processing technology, specifically to a machine tool quick positioning clamping fixture and method suitable for processing irregular parts. Background Technology

[0002] In fields such as machinery manufacturing, aerospace, and automotive parts processing, irregular parts are increasingly widely used. When processing these parts, they need to be clamped and fixed to improve processing accuracy. Therefore, the accuracy and efficiency of part clamping and positioning directly determine processing precision, production efficiency, and product qualification rate.

[0003] Existing machine tools mostly use rigid clamping fixtures when machining parts. Although such fixtures have high structural stability, their shape limitations result in extremely poor versatility. When machining some irregular parts, it is necessary to frequently design and change customized fixtures, which not only increases production costs, but also requires machine downtime for each change, seriously affecting machining efficiency. To address the above problems, a quick positioning clamping fixture for machine tools suitable for machining irregular parts is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a quick positioning and clamping fixture and method for machine tools suitable for machining irregular parts, so as to solve the problems of poor versatility, increased cost, and reduced machining efficiency of rigid clamping fixtures mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a quick positioning and clamping fixture for machine tools suitable for machining irregular parts, comprising a base, bolt connectors fixedly installed on the side wall of the base by bolts, two sliding grooves 1 opened on the inner side of the base, the same slide block slidably embedded in the inner wall of the two sliding grooves 1, and a machining table fixedly installed on the top of the slide block; It also includes a coarse clamping assembly, which is disposed on the surface of the machining table. The coarse clamping assembly includes a servo motor, which is fixedly installed on the outer wall of the machining table. A threaded rod is fixedly connected to the output end of the servo motor. Two threaded sliders pass through the outer wall of the threaded rod and are threadedly connected to it. Two opposite threads are opened on the outer wall of the threaded rod corresponding to the two threaded sliders. The threaded sliders are slidably connected to the inner wall of the machining table. Threaded connecting plates are fixedly connected to both ends of the threaded sliders. Two clamping blocks are slidably attached to the top of the machining table. The clamping blocks and the threaded sliders are fixedly connected by the threaded connecting plates. It also includes an adaptive fitting component, which includes an array of several air cylinders embedded on opposite sides of two clamping blocks and an air cavity opened inside the clamping blocks. The inner wall of the air cylinder has a limiting groove. One end of the air cylinder is slidably connected to a piston rod, and one end of the piston rod is fixedly connected to a piston head. A sealing ring is sleeved on the outer side of the piston head. The outer side of the sealing ring slides and seals against the inner wall of the limiting groove. A solenoid valve is installed at the end of the air cylinder away from the piston rod. All the air cylinders are controlled to communicate with or isolate themselves from the air cavity through the corresponding solenoid valve.

[0006] Preferably, the coarse clamping assembly further includes a second slide groove formed inside the processing table. The upper and lower inner walls of the second slide groove are slidably connected to the upper and lower ends of the threaded slider, respectively. The inner wall of the second slide groove is rotatably connected to the end of the threaded rod away from the servo motor.

[0007] Preferably, the adaptive fitting component is integrated within the coarse clamping component, and the adaptive fitting component is used to adapt to the irregular workpiece surface to achieve precise fitting and positioning.

[0008] Preferably, the end of the piston rod away from the piston head is covered with a buffer pad, and the surface of the buffer pad is provided with anti-slip texture.

[0009] Preferably, the machine tool quick positioning clamping fixture suitable for machining irregular parts further includes a piston reset assembly, which is disposed inside the clamping block and is used to quickly reset the piston rod.

[0010] Preferably, the piston reset assembly includes a cylinder, a push plate, a sealing sleeve, and a vent hole. The cylinder is installed on the side of the clamping block away from the piston rod. The push plate is slidably connected to the inner wall of the clamping block. The sealing sleeve wraps around the edge of the push plate, and the outer side of the sealing sleeve slidably seals against the inner wall of the clamping block. The vent hole is located on the side of the clamping block near the cylinder.

[0011] Preferably, the quick positioning and clamping fixture for machine tools suitable for machining irregular parts further includes a position adjustment component, which is disposed on the inner side of the base and is used to drive the slide to slide along the slide groove.

[0012] Preferably, the position adjustment assembly includes a second servo motor, a drive shaft, a worm, a worm wheel, a rotating shaft, gears, and racks. The second servo motor is mounted on one side of the slide. The drive shaft and the worm are rotatably connected to the inner wall of the slide. The two ends of the drive shaft are fixedly connected to one end of the worm and the output end of the second servo motor, respectively. The worm wheel meshes with the outer edge of the worm. There are two rotating shafts, gears, and racks. The two rotating shafts are rotatably connected to the bottom of the inner cavity of the slide. The outer wall of one of the rotating shafts is fixedly connected to the inner wall of the worm wheel. The two gears are fixedly connected to the outer walls of the two rotating shafts, and their outer edges mesh. The two racks are fixedly connected to the inner walls of the two sliding grooves, and their tooth surfaces mesh with the outer edges of the two gears, respectively.

[0013] Preferably, both the sealing ring and the sealing sleeve are made of rubber material with high temperature resistance and wear resistance to ensure the sealing effect between the air cylinder and the piston.

[0014] The specific operating steps for using a quick-positioning clamping fixture suitable for machining irregular parts are as follows: Step 1: Clamping preparation. Fix the base to the machine tool with bolts. Use the piston reset assembly to start the cylinder to retract and drive the push plate to reset. The air chamber forms a negative pressure to attract all piston rods and piston heads to the initial position, so that the ends of all piston rods are kept on the same plane. Step 2: Coarse positioning and clamping. Place the irregular part on the top of the machining table. Through the coarse clamping assembly, drive the clamping blocks to move towards each other, so that the piston rod drives the buffer pad to initially contact the part, completing the coarse positioning. Step 3: Adaptive bonding and positioning. Through the adaptive bonding component, the piston rod of the irregular surface of the part retracts due to pressure. Gas pushes the piston rod of other parts to extend through the air chamber until all the buffer pads are tightly bonded to the part. The solenoid valve is closed to lock the position of the piston rod, completing the precise clamping. Step 4: Position adjustment. The position adjustment component drives the slide block to slide along the slide groove, moving the part to the preset processing position for processing. Step 5: Workpiece removal and reset. After processing, open the solenoid valve. Through the piston reset assembly, first pull the push plate to create a negative pressure in the gas chamber, adsorbing the piston head to retract to the end of the limiting groove, so that the ends of all piston rods are on the same plane. Through the coarse clamping assembly, move the clamping blocks back to back, remove the workpiece, and then push the push plate to squeeze the gas and push the piston rod to reset.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the irregular parts on the top of the processing table are initially positioned and clamped by the coarse clamping component, and the piston rod is controlled by the adaptive fitting component to clamp the irregular surface of the parts at multiple points. This can quickly position the parts, improve the versatility of the clamping fixture, reduce the cost of changing fixtures, and improve the processing efficiency of the parts.

[0016] 2. In this invention, the piston reset assembly can quickly keep the piston rod level and return it to its initial position after the current clamping and processing operation is completed, which facilitates the next round of clamping and processing, improves clamping efficiency, and thus improves processing efficiency.

[0017] 3. In this invention, the position of the slide is finely adjusted by the position adjustment component, thereby enabling the processing table and the parts clamped on its top to be precisely adjusted in position, improving the processing accuracy, and thus improving the yield and pass rate of the processed parts. Attached Figure Description

[0018] Figure 1 This is a perspective view of a machine tool quick-positioning clamping fixture applicable to the machining of irregular parts according to the present invention; Figure 2 This is a schematic diagram of the rough clamping assembly of a machine tool quick positioning clamping fixture applicable to the machining of irregular parts according to the present invention; Figure 3 This is a schematic diagram of the machining table surface structure of the machine tool quick positioning clamping fixture applicable to the machining of irregular parts according to the present invention; Figure 4 This is a schematic diagram of the adaptive fitting component structure of the machine tool quick positioning clamping fixture applicable to the machining of irregular parts according to the present invention; Figure 5 This is a schematic diagram of the internal structure of the air cylinder of the machine tool quick positioning clamping fixture applicable to the machining of irregular parts according to the present invention; Figure 6 This is a schematic diagram of the piston reset assembly of the machine tool quick positioning clamping fixture applicable to the machining of irregular parts according to the present invention; Figure 7 This is a schematic diagram of the internal structure of the slide of the machine tool quick positioning clamping fixture applicable to the machining of irregular parts according to the present invention; Figure 8 This is a schematic diagram of the position adjustment component of the machine tool quick positioning clamping fixture applicable to the machining of irregular parts according to the present invention; Figure 9 This is a schematic diagram illustrating the steps of using a machine tool quick positioning and clamping fixture applicable to the machining of irregular parts according to the present invention.

[0019] In the diagram: 1. Base; 2. Bolt connector; 3. Slide groove one; 4. Slide block; 5. Machining table; 6. Coarse clamping assembly; 61. Servo motor one; 62. Threaded rod; 63. Threaded slider; 64. Threaded connecting plate; 65. Clamping block; 66. Slide groove two; 7. Self-adaptive fitting assembly; 71. Air cylinder; 72. Air chamber; 73. Limiting groove; 74. Piston rod; 75. Piston head; 76. Sealing ring; 77. Solenoid valve; 78. Buffer pad; 8. Piston reset assembly; 81. Cylinder; 82. Push plate; 83. Sealing sleeve; 84. Vent hole; 9. Position adjustment assembly; 91. Servo motor two; 92. Drive shaft; 93. Worm; 94. Worm wheel; 95. Rotating shaft; 96. Gear; 97. Rack. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Reference Figure 1-8 As shown: A quick positioning and clamping fixture for machine tools suitable for machining irregular parts includes a base 1. The side wall of the base 1 is fixedly installed with bolt connectors 2 by bolts. Two slide grooves 3 are opened on the inner side of the base 1. The same slide block 4 is slidably embedded in the inner wall of the two slide grooves 3. A machining table 5 is fixedly installed on the top of the slide block 4. The machining table 5 is used to place the parts and perform machining operations after clamping the parts. It also includes a coarse clamping assembly 6, which is set on the surface of the processing table 5. The coarse clamping assembly 6 includes a servo motor 61, which is fixedly installed on the outer wall of the processing table 5. The output end of the servo motor 61 is fixedly connected to a threaded rod 62. Two threaded sliders 63 pass through the outer wall of the threaded rod 62 and are threadedly connected to it. The outer wall of the threaded rod 62 has two opposite threads corresponding to the two threaded sliders 63. The threaded sliders 63 are slidably connected to the inner wall of the processing table 5. Both ends of the threaded sliders 63 are fixedly connected to threaded connecting plates 64. Two clamping blocks 65 slide against the top of the processing table 5. The clamping blocks 65 are fixedly connected to the threaded sliders 63 through the threaded connecting plates 64. Through preliminary clamping, the parts can be initially fixed, which is convenient for subsequent precise clamping. It also includes an adaptive bonding component 7, which includes a plurality of air cylinders 71 arrayed and embedded on one side of the two clamping blocks 65, and an air cavity 72 opened inside the clamping block 65. The inner wall of the air cylinder 71 is provided with a limiting groove 73. One end of the air cylinder 71 is slidably connected to a piston rod 74, and one end of the piston rod 74 is fixedly connected to a piston head 75. A sealing ring 76 is sleeved on the outside of the piston head 75. The outside of the sealing ring 76 slides and seals with the inner wall of the limiting groove 73. A solenoid valve 77 is installed at the end of the air cylinder 71 away from the piston rod 74. All air cylinders 71 are controlled to communicate or isolate themselves from the air cavity 72 through the corresponding solenoid valve 77. The solenoid valve 77 can be opened and closed by manual control or unified operation by the machine tool control system. It is mainly used to control the communication between the air cylinder 71 and the gas inside the air cavity 72. By bonding the surface of irregular parts at multiple points, the stability of clamping is improved.

[0022] See Figures 2-3 The coarse clamping assembly 6 also includes a second slide groove 66 inside the processing table 5. The upper and lower inner walls of the second slide groove 66 are slidably connected to the upper and lower ends of the threaded slider 63, respectively. The inner wall of the second slide groove 66 is rotatably connected to the end of the threaded rod 62 away from the servo motor 61. By setting the second slide groove 66, the threaded rod 62 is placed inside the second slide groove 66, which frees up the top space of the processing table 5 and prevents impurities such as iron filings generated during processing from falling onto the threaded rod 62 and interfering with the threaded connection with the threaded slider 63.

[0023] See Figures 4-5 The adaptive bonding component 7 is integrated into the coarse clamping component 6. The adaptive bonding component 7 is used to adapt to the irregular workpiece surface to achieve precise bonding and positioning.

[0024] See Figures 4-5 The piston rod 74 is wrapped with a buffer pad 78 at the end away from the piston head 75. The surface of the buffer pad 78 is provided with anti-slip texture to prevent the buffer pad 78 from slipping when it comes into contact with the part and affecting the clamping accuracy.

[0025] See Figure 6 The machine tool quick positioning clamping fixture suitable for machining irregular parts also includes a piston reset assembly 8. The piston reset assembly 8 is located inside the clamping block 65. The piston reset assembly 8 is used to quickly reset the piston rod 74. After the current clamping and machining operation is completed, the piston rod 74 can be quickly restored to the initial position, which is convenient for the next round of clamping and machining.

[0026] See Figure 6The piston reset assembly 8 includes a cylinder 81, a push plate 82, a sealing sleeve 83, and a vent 84. The cylinder 81 is installed on the side of the clamping block 65 away from the piston rod 74. The push plate 82 is slidably connected to the inner wall of the clamping block 65. The sealing sleeve 83 wraps around the edge of the push plate 82, and the outer side of the sealing sleeve 83 slides and seals against the inner wall of the clamping block 65. The vent 84 is opened on the side of the clamping block 65 near the cylinder 81. By moving the push plate 82 and sealing the sealing sleeve 83, the volume of the air chamber 72 can be controlled, and the air pressure inside the air chamber 72 can be changed, so that the piston rod 74 can move uniformly. At the same time, due to the limiting groove 73, the piston rod 74 can be controlled to move to one end of the limiting groove 73 to achieve a flush effect. The vent 84 is used to balance the air pressure inside the clamping block 65 and the outside, ensuring that the push plate 82 slides smoothly under the drive of the cylinder 81.

[0027] See Figures 7-8 The machine tool quick positioning clamping fixture suitable for machining irregular parts also includes a position adjustment component 9. The position adjustment component 9 is located inside the base 1. The position adjustment component 9 is used to drive the slide 4 to slide along the slide groove 3, so as to make fine adjustment of the position of the slide 4 and the workpiece on the machining table 5 and improve the machining accuracy.

[0028] See Figures 7-8 The position adjustment component 9 includes a second servo motor 91, a drive shaft 92, a worm gear 93, a worm wheel 94, a rotating shaft 95, a gear 96, and a rack 97. The second servo motor 91 is mounted on one side of the slide 4. The drive shaft 92 and the worm gear 93 are both rotatably connected to the inner wall of the slide 4. The two ends of the drive shaft 92 are fixedly connected to one end of the worm gear 93 and the output end of the second servo motor 91, respectively. The worm wheel 94 meshes with the outer edge of the worm gear 93. There are two rotating shafts 95, two gears 96, and two racks 97. Shaft 95 is rotatably connected to the bottom of the inner cavity of slide 4. The outer wall of one of the shafts 95 is fixedly connected to the inner wall of the worm gear 94. Two gears 96 are fixedly connected to the outer walls of the two shafts 95 respectively, and the outer edges of the two gears 96 mesh with each other. Two racks 97 are fixedly connected to the inner walls of the two slide grooves 3 respectively, and the tooth surfaces of the two racks 97 mesh with the outer edges of the two gears 96 respectively. Through the self-locking characteristics of worm 93 and worm gear 94, horizontal wobbling of slide 4 is effectively prevented, and machining accuracy is improved.

[0029] See Figures 5-6 Both the sealing ring 76 and the sealing sleeve 83 are made of rubber material with high temperature resistance and wear resistance to ensure the sealing effect between the air cylinder 71 and the piston.

[0030] The specific operating steps for using a quick-positioning clamping fixture suitable for machining irregular parts are as follows: Step 1: Clamping preparation. Fix the base 1 to the machine tool with bolt connector 2. Through the piston reset assembly 8, start the cylinder 81 to retract and drive the push plate 82 to reset. The air chamber 72 forms a negative pressure to attract all piston rods 74 and piston heads 75 to the initial position, so that the ends of all piston rods 74 are kept on the same plane. Step 2: Coarse positioning and clamping. Place the irregular part on the top of the processing table 5. Through the coarse clamping assembly 6, start the servo motor 61 to drive the threaded rod 62, which drives the two threaded sliders 63 to move towards each other, so that the buffer pad 78 initially contacts the part, completing the coarse positioning. Step 3: Adaptive bonding and positioning. Through the adaptive bonding component 7, all solenoid valves 77 are opened to connect the air chamber 72 with all air cylinders 71. The piston rod 74 of the irregular surface of the part retracts due to pressure. The gas pushes the piston rod 74 that is not in contact with the part to extend through the air chamber 72 until all buffer pads 78 are tightly bonded to the part. The solenoid valve 77 is closed to lock the position of the piston rod 74, and the precise clamping is completed. Step 4: Position adjustment. The servo motor 91 is started through the position adjustment component 9. The worm gear 93 and worm wheel 94 drive the two gears 96 to rotate in opposite directions and mesh with the rack 97. This drives the slide 4 to move the part to the preset processing position for processing. Step 5: Workpiece removal and resetting. After processing, open the solenoid valve 77. The cylinder 81 pulls the push plate 82 back to create a negative pressure in the gas chamber 72, which adsorbs the piston head 75 and retracts it to the end of the limiting groove 73, so that the ends of all piston rods 74 are on the same plane. The coarse clamping assembly 6 moves the clamping blocks 65 in opposite directions to remove the workpiece. Then, control the cylinder 81 to push the push plate 82 to squeeze the gas inside the gas chamber 72 and push the piston rods 74 to reset.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A quick-positioning clamping fixture for machine tools suitable for machining irregular parts, comprising a base (1), wherein a bolted connector (2) is fixedly mounted on the side wall of the base (1) by bolts, characterized in that: The base (1) has two sliding grooves (3) on its inner side. The same slide block (4) is slidably fitted into the inner wall of the two sliding grooves (3). A processing table (5) is fixedly installed on the top of the slide block (4). It also includes a coarse clamping assembly (6), which is disposed on the surface of the processing table (5). The coarse clamping assembly (6) includes a servo motor (61), which is fixedly installed on the outer wall of the processing table (5). The output end of the servo motor (61) is fixedly connected to a threaded rod (62). The outer wall of the threaded rod (62) has two threaded sliders (63) that pass through it and are threadedly connected to it. The outer wall of the threaded rod (62) has two opposite threads corresponding to the two threaded sliders (63). The threaded sliders (63) are slidably connected to the inner wall of the processing table (5). Both ends of the threaded sliders (63) are fixedly connected to threaded connecting plates (64). The top of the processing table (5) has two clamping blocks (65) that slide against it. The clamping blocks (65) and the threaded sliders (63) are fixedly connected by the threaded connecting plates (64). It also includes an adaptive fitting component (7), which includes an array of several air cylinders (71) embedded on opposite sides of two clamping blocks (65) and an air cavity (72) opened inside the clamping block (65). The inner wall of the air cylinder (71) is provided with a limiting groove (73). One end of the air cylinder (71) is slidably connected to a piston rod (74). One end of the piston rod (74) is fixedly connected to a piston head (75). A sealing ring (76) is sleeved on the outside of the piston head (75). The outside of the sealing ring (76) slides and seals with the inner wall of the limiting groove (73). A solenoid valve (77) is installed on the end of the air cylinder (71) away from the piston rod (74). All the air cylinders (71) are controlled to communicate with or be isolated from the air cavity (72) by the corresponding solenoid valve (77).

2. The quick positioning and clamping fixture for machine tools suitable for machining irregular parts according to claim 1, characterized in that: The coarse clamping assembly (6) also includes a second slide groove (66) inside the processing table (5). The upper and lower inner walls of the second slide groove (66) are slidably connected to the upper and lower ends of the threaded slider (63), respectively. The inner wall of the second slide groove (66) is rotatably connected to the end of the threaded rod (62) away from the servo motor (61).

3. The quick positioning and clamping fixture for machine tools suitable for machining irregular parts according to claim 1, characterized in that: The adaptive fitting component (7) is integrated within the coarse clamping component (6). The adaptive fitting component (7) is used to adapt to the irregular workpiece surface to achieve precise fitting and positioning.

4. The quick positioning and clamping fixture for machine tools suitable for machining irregular parts according to claim 1, characterized in that: The piston rod (74) is wrapped with a buffer pad (78) at the end away from the piston head (75), and the surface of the buffer pad (78) is provided with anti-slip texture.

5. The quick positioning and clamping fixture for machine tools suitable for machining irregular parts according to claim 1, characterized in that: It also includes a piston reset assembly (8), which is disposed inside the clamp (65) and is used to quickly reset the piston rod (74).

6. The quick positioning and clamping fixture for machine tools suitable for machining irregular parts according to claim 5, characterized in that: The piston reset assembly (8) includes a cylinder (81), a push plate (82), a sealing sleeve (83), and a vent (84). The cylinder (81) is installed on the side of the clamping block (65) away from the piston rod (74). The push plate (82) is slidably connected to the inner wall of the clamping block (65). The sealing sleeve (83) is wrapped around the edge of the push plate (82). The outer side of the sealing sleeve (83) is slidably sealed to the inner wall of the clamping block (65). The vent (84) is opened on the side of the clamping block (65) near the cylinder (81).

7. The quick positioning and clamping fixture for machine tools suitable for machining irregular parts according to claim 1, characterized in that: It also includes a position adjustment component (9), which is disposed on the inner side of the base (1) and is used to drive the slide (4) to slide along the slide groove (3).

8. The quick positioning and clamping fixture for machine tools suitable for machining irregular parts according to claim 7, characterized in that: The position adjustment assembly (9) includes a second servo motor (91), a drive shaft (92), a worm (93), a worm wheel (94), a rotating shaft (95), a gear (96), and a rack (97). The second servo motor (91) is mounted on one side of the slide (4). The drive shaft (92) and the worm (93) are rotatably connected to the inner wall of the slide (4). The two ends of the drive shaft (92) are fixedly connected to one end of the worm (93) and the output end of the second servo motor (91), respectively. The worm wheel (94) meshes with the outer edge of the worm (93). There are two shafts (95), two gears (96), and two racks (97). The two shafts (95) are rotatably connected to the bottom of the inner cavity of the slide (4). The outer wall of one of the shafts (95) is fixedly connected to the inner wall of the worm gear (94). The two gears (96) are fixedly connected to the outer walls of the two shafts (95) respectively. The outer edges of the two gears (96) mesh with each other. The two racks (97) are fixedly connected to the inner walls of the two slide grooves (3) respectively. The tooth surfaces of the two racks (97) mesh with the outer edges of the two gears (96) respectively.

9. The quick-positioning clamping fixture for machine tools suitable for machining irregular parts according to claim 1 or 5, characterized in that: Both the sealing ring (76) and the sealing sleeve (83) are made of rubber material with high temperature resistance and wear resistance to ensure the sealing effect between the air cylinder and the piston.

10. The method of using the quick-positioning clamping fixture for machine tools suitable for machining irregular parts according to any one of claims 1-9, characterized in that: The specific steps for using this method are as follows: Step 1: Clamping preparation. Fix the base (1) on the machine tool with bolt connector (2). Through the piston reset assembly (8), start the cylinder (81) to retract and drive the push plate (82) to reset. The air chamber (72) forms a negative pressure to attract all piston rods (74) and piston heads (75) to the initial position, so that the ends of all piston rods (74) are kept on the same plane. Step 2: Coarse positioning clamping. Place the irregular part on the top of the processing table (5). Through the coarse clamping assembly (6), drive the clamping blocks (65) to move towards each other, so that the piston rod (74) drives the buffer pad (78) to initially contact the part, and complete the coarse positioning. Step 3: Adaptive fitting and positioning. Through the adaptive fitting component (7), the piston rod (74) of the irregular surface of the part is retracted by the pressure part. The gas pushes the piston rod (74) of other parts to extend through the gas chamber (72) until all the buffer pads (78) are tightly fitted to the part. The solenoid valve (77) is closed to lock the position of the piston rod (74) and complete the precise clamping. Step 4: Position adjustment. Using the position adjustment component (9), drive the slide block (4) to slide along the slide groove (3), moving the part to the preset processing position for processing; Step 5: Remove and reset the workpiece. After processing, open the solenoid valve (77). Through the piston reset assembly (8), first pull the push plate (82) to make the gas inside the gas chamber (72) form a negative pressure, adsorb the piston head (75) to retract to the end of the limit groove (73), so that the ends of all piston rods (74) are in the same plane. Through the coarse clamping assembly (6), make the clamping blocks (65) move in opposite directions, remove the workpiece, and then push the push plate (82) to squeeze the gas and push the piston rod (74) to reset.

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