A positioning tool for a cylinder and a processing method thereof

Abstract

The application provides a cylinder positioning tool, which comprises a machine tool assembly and a mounting assembly fixed on a driving shaft of the machine tool assembly, and a hinge pressing assembly, a clamping assembly and a rotating assembly are respectively arranged on the mounting assembly. The cylinder processing method comprises cylinder positioning, cylinder pressing, cylinder adding, cylinder limiting and cylinder adjusting. The machine tool assembly and the mounting assembly are used for cylinder processing. During processing, the hinge pressing assembly and the clamping assembly are used for multi-point positioning of the cylinder. Meanwhile, the telescopic cylinder can be avoided during processing, the cutter interference can be avoided to realize efficient processing of the surface of the cylinder and the edges of both ends, the rotating assembly is arranged to temporarily fix the cylinder, the hinge pressing assembly and the clamping assembly are used for re-fixing, the rapid processing of different positions of different surfaces is facilitated, the positioning accuracy during each processing can be ensured, and the use performance and positioning accuracy of the cylinder positioning tool are improved.

Description

Technical Field

[0001] This invention relates to a positioning fixture and machining method for cylinder barrels, belonging to the field of cylinder barrel machining technology. Background Technology

[0002] The cylinder, or motor housing, is typically made of metal (such as cast iron, aluminum alloy, or steel) to provide good heat dissipation and mechanical strength. Aluminum alloys are widely used in small and medium-sized motors due to their lightweight properties, while cast iron is mostly used in large industrial motors. The protection rating must meet IP standards (such as IP54 dust and water resistance) to protect internal components; the housing may integrate heat sinks or air ducts to optimize thermal management; some applications require consideration of electromagnetic compatibility, using conductive materials or special coatings. Die casting (aluminum alloy) or sand casting (cast iron) are common processes for cylinder machining; precision motors may use CNC machining. Surface treatments such as anodizing or painting can enhance corrosion resistance.

[0003] The cylinder is an important component of an electric motor. After production, the cylinder needs to be machined on a machine tool. During machining, inaccurate positioning can lead to errors in machining accuracy. Furthermore, the cylinder requires multi-point positioning to ensure the accuracy of subsequent machining. Tool interference may occur during machining, making it difficult to effectively machine the cylinder. After machining, the cylinder angle needs to be adjusted due to the influence of positioning fixtures, which makes it difficult to make quick adjustments during each machining process, thus affecting the machining efficiency of the cylinder. Each adjustment is also prone to errors, making it difficult to achieve high-precision positioning and machining. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the present invention provides a positioning fixture and processing method for a cylinder barrel.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions: The present invention provides a positioning fixture for a cylinder, comprising a machine tool assembly and a mounting assembly. The mounting assembly is fixed on the drive shaft of the machine tool assembly and consists of a base plate, a side plate and a top plate. The mounting assembly is characterized in that a hinge clamping assembly, a clamping assembly and a rotating assembly are respectively mounted on the mounting assembly. The hinge clamping assembly is fixedly installed on the top of the base plate. The telescopic end of the hinge clamping mechanism passes through the top plate and is connected to the swing arm. The middle part of the swing arm is rotatably connected to the top of the top plate. The clamping assembly includes a clamping cylinder, a rotating cylinder, and a floating cylinder. The clamping cylinder is fixedly installed on one outer wall of the side plate, the rotating cylinder is fixedly installed on the other outer wall of the side plate, and the floating cylinder is fixedly installed on the top of the bottom plate. A rotating assembly is fixedly installed to the bottom of the top plate. The rotating assembly is disposed between the hinge clamping assembly and the floating cylinder. The rotating assembly is provided with a rotating mechanism and a clamping mechanism for rotating and fixing the cylinder.

[0006] In this technical solution, the machine tool assembly includes a machining platform, a tailstock, and a four-axis machine base. The machining platform is fixedly mounted on the machine tool base. The tailstock and the four-axis machine base are fixedly mounted at both ends of the machining platform, respectively. The output end of the four-axis machine base and the rotation axis of the tailstock are both fixedly connected to the mounting assembly. A control box is also fixedly mounted on one side of the four-axis machine base.

[0007] In this technical solution, four side plates are installed on the base plate. Each side plate is located on both sides of the base plate. Every two side plates are symmetrically arranged at both ends of the base plate, and a gap for positioning and fixing the cylinder is formed between adjacent side plates. The two side plates on the same side are fixedly connected to the top plate.

[0008] In this technical solution, the hinge clamping assembly includes a telescopic cylinder and a swing arm. The telescopic end of the telescopic cylinder is fixedly connected to a telescopic shaft. The telescopic shaft is inserted through the top plate and fixedly connected to a pin. The telescopic shaft is connected to one end of the swing arm through the pin. An elongated hole is provided at the end of the swing arm, and the pin is located inside the elongated hole. A U-shaped gripper is fixedly connected to the other end of the swing arm by a screw, and the gripper contacts the upper surface of the cylinder.

[0009] In this technical solution, there are several clamping cylinders, which are evenly arranged on the outer wall of the same side of two side plates. The other two side plates are equipped with multiple rotating cylinders. Each rotating cylinder is rotatably connected to a rotating arm. The rotating arm and the telescopic end of the clamping cylinder are fixedly connected to the clamping block by screws, and the clamping block is in contact with the cylinder surface.

[0010] In this technical solution, the floating cylinder is located at the bottom of the cylinder barrel, and the telescopic end of the floating cylinder is located below one side of the cylinder barrel, and the telescopic end of the floating cylinder is in contact with the surface of the cylinder barrel.

[0011] In this technical solution, the rotating assembly includes two fixed seats. One fixed seat is fixedly installed to the bottom of the top plate, and the other fixed seat is fixed to the bottom of the top plate by a column. The two fixed seats are respectively located diagonally below and diagonally above the cylinder. Each fixed seat is fixedly connected to a connecting seat by a fixed shaft. A rotating mechanism is fixedly installed on the connecting seat.

[0012] In this technical solution, the rotating mechanism includes a track, which is an arc-shaped hollow structure. Two symmetrically distributed racks are fixedly connected to the inner wall of the track. A sliding plate is slidably connected inside the track. Both ends of the sliding plate are fixedly connected to a connecting plate. The connecting plate is a U-shaped structure, and a micro motor is fixedly installed on the inner wall of the connecting plate. The output end of the micro motor is fixedly connected to an output shaft. Two gears are fixedly connected to the output shaft, and each gear meshes with a rack.

[0013] In this technical solution, the clamping mechanism includes clamping plates. There are two clamping plates symmetrically arranged on the connecting plate. The clamping plates have a bent structure and are rotatably connected to the side wall of the connecting plate. The clamping plates are in contact with the cylinder surface. Multiple miniature cylinders are fixedly connected to the side wall of the connecting plate. The telescopic end of each miniature cylinder is in contact with the clamping plate. Both clamping plates are connected to elastic elements, and the elastic elements are inserted through the connecting plate.

[0014] A method for machining a cylinder using a positioning fixture, the method comprising the following steps: (1) Cylinder positioning: Place the cylinder on the mounting assembly, and use the clamping cylinder to push the telescopic end to clamp the cylinder. At the same time, the rotating cylinder drives the rotating arm to rotate and causes the clamping block to contact the side wall of the cylinder. When the floating cylinder is started, its telescopic end rises so that it abuts against the cylinder to achieve positioning. (2) The cylinder is pressed, and the telescopic cylinder is started to drive the telescopic shaft to move. The telescopic shaft drives the swing arm to rotate on the top plate through the pin. When the middle part of the swing arm rotates around the top plate, it drives the gripper to press against the upper side of the cylinder. When the swing arm rotates, the pin moves in the long hole to achieve stable rotation of the swing arm. (3) Cylinder barrel machining: The cylinder barrel is machined at both ends and top on the machining platform. The assembly rotates between the four-axis machine base and the tailstock to adjust the angle during machining. At the same time, the machining platform is mounted on the machine tool base for translation adjustment. During machining, the cylinder is clamped and retracted to avoid interference with the cutting tool. (4) Cylinder barrel limit, after processing, start the micro cylinder, the extension end of the micro cylinder pushes the clamping plate to rotate, so that the clamping plate is clamped on the side wall of the cylinder barrel, and then retract the extension cylinder, clamping cylinder, rotating cylinder and floating cylinder, so that the cylinder barrel is clamped and fixed by the clamping plate. (5) Cylinder adjustment: Start the micro motor to drive the output shaft to rotate within the connecting plate. The output shaft drives the gear to rotate, causing it to move on the gear plate. At this time, the connecting plate drives the slide plate to slide inside the track, thereby driving the clamped and fixed cylinder to rotate. After adjustment, continue to clamp and position the cylinder, close the micro cylinder, and the elastic element resets the clamping plate. Start the micro motor to reset the slide plate and connecting plate for subsequent processing. Based on common knowledge in the field, the above preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0015] The positive and progressive effects of this invention are as follows: The aforementioned cylinder positioning fixture and machining method utilize a machine tool assembly and an installation assembly for cylinder machining. During machining, multi-point positioning of the cylinder is achieved through a hinge clamping assembly and a clamping assembly, ensuring subsequent machining accuracy. Simultaneously, the telescopic cylinder can be avoided during machining, preventing tool interference and enabling efficient machining of the cylinder surface and both end edges. A rotating assembly is provided for temporary cylinder fixation, and angle adjustment is achieved after cylinder avoidance. Re-fixation is achieved through the hinge clamping assembly and clamping assembly, facilitating rapid machining of different positions on different surfaces. This ensures positioning accuracy during each machining operation, improves cylinder machining efficiency, and solves the problem of frequent cylinder adjustments after each machining cycle. Continuous cylinder machining is possible under multi-point positioning, improving the performance and positioning accuracy of the cylinder positioning fixture. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0017] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0018] Figure 3 This is a schematic diagram of the half-section structure of the present invention.

[0019] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at point B in the middle.

[0020] Figure 5 For the present invention Figure 3 A magnified schematic diagram of the structure at point C.

[0021] Figure 6 This is a top view of the overall structure of the present invention.

[0022] Figure 7 This is a schematic diagram of the overall front view of the present invention.

[0023] Figure 8 This is a schematic diagram of the internal front view of the present invention.

[0024] Figure 9 This is a partial three-dimensional structural diagram of the rotating component of the present invention.

[0025] Figure 10 This is a partial three-dimensional structural diagram of the connecting plate of the present invention.

[0026] Explanation of reference numerals in the attached figures 100. Machine tool assembly; 101. Machining platform; 102. Tailstock; 103. Four-axis machine base; 104. Control box; 200. Assembly assembly; 201. Base plate; 202. Side plate; 203. Top plate; 300. Hinge clamping assembly; 301. Telescopic cylinder; 302. Telescopic shaft; 303. Pin; 304. Swing arm; 305. Elongated hole; 306. Gripper; 400. Clamping assembly; 401. Clamping cylinder; 402. Rotary cylinder; 403. Rotating arm; 404. Clamping block; 405. Cylinder barrel; 406. Floating cylinder; 500. Rotating component; 501. Fixed base; 502. Fixed shaft; 503. Connecting base; 504. Track; 505. Rack; 506. Slide plate; 507. Connecting plate; 508. Miniature motor; 509. Output shaft; 510. Gear; 511. Clamping plate; 512. Elastic element; 513. Miniature cylinder. Detailed Implementation

[0027] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0028] like Figure 1-10 As shown, the positioning fixture for a cylinder includes a machine tool assembly 100 and a mounting assembly 200. The mounting assembly 200 is fixed on the drive shaft of the machine tool assembly 100. The mounting assembly 200 consists of a base plate 201, a side plate 202, and a top plate 203. The mounting assembly 200 is characterized in that a hinge clamping assembly 300, a clamping assembly 400, and a rotating assembly 500 are respectively mounted on the mounting assembly 200. The hinge clamping assembly 300 is fixedly installed on the top of the base plate 201. The telescopic end of the hinge clamping mechanism passes through the top plate 203 and is connected to the swing arm 304. The middle part of the swing arm 304 is rotatably connected to the top of the top plate 203. The clamping assembly 400 includes a clamping cylinder 401, a rotary cylinder 402 and a floating cylinder 406. The clamping cylinder 401 is fixedly installed on one side of the outer wall of the side plate 202, the rotary cylinder 402 is fixedly installed on the other side of the outer wall of the side plate 202, and the floating cylinder 406 is fixedly installed on the top of the bottom plate 201. A rotating assembly 500 is fixedly installed to the bottom of the top plate 203. The rotating assembly 500 is disposed between the hinge clamping assembly 300 and the floating cylinder 406. The rotating assembly 500 is provided with a rotating mechanism and a clamping mechanism for rotating and fixing the cylinder 405.

[0029] The machine tool assembly 100 includes a machining platform 101, a tailstock 102, and a four-axis machine base 103. The machining platform 101 is fixedly mounted on the machine tool base. The tailstock 102 and the four-axis machine base 103 are fixedly mounted at both ends of the machining platform 101, respectively. The output end of the four-axis machine base 103 and the rotation axis of the tailstock 102 are both fixedly connected to the mounting assembly 200. A control box 104 is also fixedly mounted on one side of the four-axis machine base 103. Four side plates 202 are mounted on the base plate 201. Each side plate 202 is located on both sides of the base plate 201. Every two side plates 202 are symmetrically arranged at both ends of the base plate 201, and a gap for positioning and fixing the cylinder 405 is formed between adjacent side plates 202. The two side plates 202 located on the same side are fixedly connected to the top plate 203.

[0030] In this technical solution, the tailstock 102 and the four-axis base 103 on the platform can be used to install the mounting assembly 200. The drive device on the four-axis base 103 can drive the mounting assembly 200 to adjust the angle, realize multiple angle adjustments, and adjust the position of the cylinder 405 according to the tool position, thereby improving the convenience of processing.

[0031] Specifically, the mounting assembly 200 is assembled from a base plate 201, a side plate 202 and a top plate 203. The cylinder 405 can be placed on the mounting assembly 200 and the cylinder 405 can be fixed by the hinge clamping assembly 300 and the clamping assembly 400 on the mounting assembly 200.

[0032] The hinge clamping assembly 300 includes a telescopic cylinder 301 and a swing arm 304. The telescopic end of the telescopic cylinder 301 is fixedly connected to a telescopic shaft 302. The telescopic shaft 302 is inserted through the top plate 203. The telescopic shaft 302 is fixedly connected to a pin 303, and the telescopic shaft 302 is connected to one end of the swing arm 304 through the pin 303. The end of the swing arm 304 has an elongated hole 305, and the pin 303 is disposed inside the elongated hole 305. The other end of the swing arm 304 is fixedly connected to a U-shaped gripper 306 by screws, and the gripper 306 is in contact with the upper surface of the cylinder 405.

[0033] In this technical solution, when the telescopic cylinder 301 is activated, it drives the telescopic shaft 302 to move on the top plate 203. The telescopic shaft 302 pushes the swing arm 304 to rotate around its center, causing the swing arm 304 to drive the gripper 306 to press against the top of the cylinder 405. When the telescopic shaft 302 moves upward, it drives the pin 303 to move within the elongated hole 305, ensuring the stable rotation of the swing arm 304. After being positioned and fixed by the clamping assembly 400, it can be further pressed and fixed by the hinge clamping assembly 300, ensuring the stability of the cylinder 405 after positioning. The clamping cylinders 401 are of several types, and are evenly arranged on the outer wall of the same side of two side plates 202. The other two side plates 202 are each provided with multiple rotating cylinders 402. Each rotating cylinder 402 is rotatably connected to a rotating arm 403. The rotating arm 403 and the telescopic ends of the clamping cylinders 401 are fixedly connected to the clamping block 404 by screws, and the clamping block 404 is in contact with the surface of the cylinder 405. The floating cylinder 406 is located at the bottom of the cylinder 405, and the telescopic end of the floating cylinder 406 is located below one side of the cylinder 405, and the telescopic end of the floating cylinder 406 is in contact with the surface of the cylinder 405.

[0034] In this technical solution, the telescopic end of the clamping cylinder 401 can drive the clamping block 404 to abut against one side of the cylinder 405. At the same time, when the rotary cylinder 402 is started, it can drive the rotary arm 403 to rotate and drive the clamping block 404 to abut against the other side of the cylinder 405, thereby achieving the positioning and fixing of the cylinder body. Then, the floating cylinder 406 is started, causing its telescopic end to move upward and abut against the lower side of the cylinder 405, thereby achieving further limiting and fixing of the cylinder 405. Finally, the hinge clamping assembly 300 clamps and fixes the cylinder 405.

[0035] The rotating assembly 500 includes two fixed seats 501. One fixed seat 501 is fixedly installed to the bottom of the top plate 203, and the other fixed seat 501 is fixed below the top plate 203 by a column. The two fixed seats 501 are respectively located diagonally below and diagonally above the cylinder 405. Each fixed seat 501 is fixedly connected to a connecting seat 503 via a fixed shaft 502. A rotating mechanism is fixedly installed on the connecting seat 503. The rotating mechanism includes a track 504, which is an arc-shaped hollow track. The track 504 has a core structure, with two symmetrically distributed racks 505 fixedly connected to the inner wall. A sliding plate 506 is slidably connected inside the track 504. Both ends of the sliding plate 506 are fixedly connected to a connecting plate 507. The connecting plate 507 has a U-shaped structure, and a micro motor 508 is fixedly installed on the inner wall of the connecting plate 507. The output end of the micro motor 508 is fixedly connected to an output shaft 509. Two gears 510 are fixedly connected to the output shaft 509, and each gear 510 meshes with a rack 505.

[0036] In this technical solution, the rotating component 500 is positioned between the side plates 202 and is located diagonally above and below the cylinder 405. This ensures that it will not interfere with the hinge clamping component 300 and the floating cylinder 406. The connecting seat 503 can be stably installed through the fixed seat 501 and the fixed shaft 502. The rotating mechanism on the connecting seat 503 can drive the cylinder 405 to rotate and adjust the machining surface, solving the problem of the positioning fixture blocking the machining surface. This allows the cylinder 405 to rotate sequentially to achieve continuous machining.

[0037] Furthermore, the stable movement of the connecting plate 507 is achieved through the cooperation of the track 504 and the slide plate 506. When the micro motor 508 drives the output shaft 509 and the gear 510 to rotate, the meshing of the gear 510 and the rack 505 causes the slide plate 506 to move inside the track 504, thereby driving the cylinder 405 on the clamping plate 511 to rotate. At the same time, it can adapt to the clamping and fixing of cylinders 405 of different sizes, improving the applicability of the positioning fixture.

[0038] The clamping mechanism includes two clamping plates 511, which are symmetrically arranged on the connecting plate 507. The clamping plates 511 have a bent structure and are rotatably connected to the side wall of the connecting plate 507. The clamping plates 511 are in contact with the surface of the cylinder 405. Multiple miniature cylinders 513 are fixedly connected to the side wall of the connecting plate 507. The telescopic end of each miniature cylinder 513 is in contact with the clamping plate 511. Both clamping plates 511 are connected to the elastic element 512, and the elastic element 512 is inserted through the connecting plate 507.

[0039] In this technical solution, the micro cylinder 513 can be activated to hold the clamping plate 511 against it, and when the clamping plate 511 is rotated, the other end of the clamping plate 511 will press against the surface of the cylinder 405, thereby achieving the clamping and fixing of the cylinder 405. This facilitates the rotation of the cylinder 405 to adjust the machining surface and facilitates continuous machining.

[0040] A cylinder barrel machining method using a cylinder barrel positioning fixture includes the following steps: (1) Positioning of cylinder 405: Place cylinder 405 on mounting assembly 200. The clamping cylinder 401 pushes the telescopic end to clamp cylinder 405. At the same time, the rotating cylinder 402 drives the rotating arm 403 to rotate and drives the clamping block 404 to contact the side wall of cylinder 405. When the floating cylinder 406 is started, its telescopic end rises so that it abuts against cylinder 405 to achieve positioning. (2) When the cylinder 405 is pressed, the telescopic cylinder 301 is started to drive the telescopic shaft 302 to move. The telescopic shaft 302 drives the swing arm 304 to rotate on the top plate 203 through the pin 303. When the middle part of the swing arm 304 rotates around the top plate 203, it drives the gripper 306 to press against the upper side of the cylinder 405. When the swing arm 304 rotates, the pin 303 moves in the long hole 305 to achieve stable rotation of the swing arm 304. (3) Cylinder barrel 405 machining: The two ends and top of cylinder barrel 405 are machined on machining platform 101. The mounting assembly 200 rotates between the four-axis machine base 103 and tailstock 102 to achieve angle adjustment during machining. At the same time, machining platform 101 is mounted on machine tool base for translation adjustment. During machining, the clamping cylinder 401 retracts to avoid interference with the tool. (4) The cylinder 405 is limited. After processing, the micro cylinder 513 is started. The extension end of the micro cylinder 513 pushes the clamping plate 511 to rotate, so that the clamping plate 511 is clamped on the side wall of the cylinder 405. Then the extension cylinder 301, clamping cylinder 401, rotating cylinder 402 and floating cylinder 406 are withdrawn, so that the cylinder 405 is clamped and fixed by the clamping plate 511. (5) Adjust the cylinder 405, start the micro motor 508 to drive the output shaft 509 to rotate in the connecting plate 507, the output shaft 509 drives the gear 510 to rotate and move on the gear plate, at this time the connecting plate 507 drives the slide plate 506 to slide in the track 504, thereby driving the fixed cylinder 405 to rotate. After adjustment, continue to clamp and position the cylinder 405, close the micro cylinder 513, the elastic element 512 resets the clamping plate 511, start the micro motor 508 to drive the slide plate 506 and the connecting plate 507 to reset, for subsequent processing.

[0041] This invention is not limited to the embodiments described above. Any changes in shape or structure shall fall within the protection scope of this invention. The protection scope of this invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of this invention, but all such changes and modifications shall fall within the protection scope of this invention.

Claims

1. A positioning fixture for a cylinder barrel, comprising a machine tool assembly (100) and a mounting assembly (200), wherein the mounting assembly (200) is fixed on the drive shaft of the machine tool assembly (100), and the mounting assembly (200) comprises a base plate (201), a side plate (202), and a top plate (203), characterized in that, The mounting assembly (200) is respectively equipped with a hinge clamping assembly (300), a clamping assembly (400) and a rotating assembly (500); The hinge clamping assembly (300) is fixedly installed on the top of the base plate (201). The telescopic end of the hinge clamping mechanism passes through the top plate (203) and is connected to the swing arm (304). The middle part of the swing arm (304) is rotatably connected to the top of the top plate (203). The clamping assembly (400) includes a clamping cylinder (401), a rotary cylinder (402), and a floating cylinder (406). The clamping cylinder (401) is fixedly installed on one side of the outer wall of the side plate (202), the rotary cylinder (402) is fixedly installed on the other side of the outer wall of the side plate (202), and the floating cylinder (406) is fixedly installed on the top of the bottom plate (201). The rotating assembly (500) is fixedly installed to the bottom of the top plate (203). The rotating assembly (500) is disposed between the hinge clamping assembly (300) and the floating cylinder (406). The rotating assembly (500) is provided with a rotating mechanism and a clamping mechanism for rotating and fixing the cylinder (405). The rotating assembly (500) includes two fixed seats (501). One fixed seat (501) is fixedly installed to the bottom of the top plate (203), and the other fixed seat (501) is fixed below the top plate (203) by a column. The two fixed seats (501) are respectively located diagonally below and diagonally above the cylinder (405). Each fixed seat (501) is fixedly connected to a connecting seat (503) through a fixed shaft (502). A rotating mechanism is fixedly installed on the connecting seat (503). The rotating mechanism includes a track (504), which is an arc-shaped open space. The track (504) has two symmetrically distributed racks (505) fixedly connected to its inner sidewall. A sliding plate (506) is slidably connected inside the track (504). Both ends of the sliding plate (506) are fixedly connected to a connecting plate (507). The connecting plate (507) has a U-shaped structure, and a micro motor (508) is fixedly installed on the inner wall of the connecting plate (507). The output end of the micro motor (508) is fixedly connected to an output shaft (509). Two gears (510) are fixedly connected to the output shaft (509), and each gear (510) meshes with a rack (505).

2. The positioning fixture for a cylinder barrel as described in claim 1, characterized in that: The machine tool assembly (100) includes a machining platform (101), a tailstock (102), and a four-axis machine base (103). The machining platform (101) is fixedly mounted on the machine tool base. The tailstock (102) and the four-axis machine base (103) are fixedly mounted at both ends of the machining platform (101). The output end of the four-axis machine base (103) and the rotation axis of the tailstock (102) are fixedly connected to the mounting assembly (200). A control box (104) is also fixedly mounted on one side of the four-axis machine base (103).

3. The positioning fixture for a cylinder as described in claim 2, characterized in that: Four side plates (202) are installed on the base plate (201). Each side plate (202) is located on both sides of the base plate (201). Every two side plates (202) are symmetrically arranged at both ends of the base plate (201), and a gap is formed between adjacent side plates (202) for positioning and fixing the cylinder (405). The two side plates (202) located on the same side are fixedly connected to the top plate (203).

4. The positioning fixture for a cylinder as described in claim 3, characterized in that: The hinge clamping assembly (300) includes a telescopic cylinder (301) and a swing arm (304). The telescopic end of the telescopic cylinder (301) is fixedly connected to the telescopic shaft (302). The telescopic shaft (302) is inserted through the top plate (203). The telescopic shaft (302) is fixedly connected to the pin (303). The telescopic shaft (302) is connected to one end of the swing arm (304) through the pin (303). The end of the swing arm (304) is provided with an elongated hole (305). The pin (303) is located inside the elongated hole (305). The other end of the swing arm (304) is fixedly connected to a U-shaped gripper (306) by screws. The gripper (306) is in contact with the upper surface of the cylinder (405).

5. The positioning fixture for a cylinder barrel as described in claim 4, characterized in that: The number of clamping cylinders (401) is several. Several clamping cylinders (401) are evenly arranged on the outer wall of the same side of two side plates (202). The other two side plates (202) are each provided with multiple rotating cylinders (402). The rotating cylinders (402) are rotatably connected to rotating arms (403). The extension and retraction ends of the rotating arms (403) and the clamping cylinders (401) are fixedly connected to the clamping blocks (404) by screws. The clamping blocks (404) are in contact with the surface of the cylinder (405).

6. The positioning fixture for a cylinder barrel as described in claim 5, characterized in that: The floating cylinder (406) is located at the bottom of the cylinder (405), and the telescopic end of the floating cylinder (406) is located below one side of the cylinder (405), and the telescopic end of the floating cylinder (406) is in contact with the surface of the cylinder (405).

7. The positioning fixture for a cylinder barrel as described in claim 6, characterized in that: The clamping mechanism includes two clamping plates (511) symmetrically arranged on the connecting plate (507). The clamping plates (511) are bent and rotatably connected to the side wall of the connecting plate (507). The clamping plates (511) are in contact with the surface of the cylinder (405). Multiple miniature cylinders (513) are fixedly connected to the side wall of the connecting plate (507). The telescopic end of each miniature cylinder (513) is in contact with the clamping plate (511). Both clamping plates (511) are connected to the elastic element (512), and the elastic element (512) is inserted through the connecting plate (507).

8. A cylinder machining method based on a cylinder positioning fixture according to claim 7, characterized in that: The processing method includes the following steps: (1) Positioning of cylinder (405): Place cylinder (405) on mounting assembly (200), and use clamping cylinder (401) to push telescopic end to clamp cylinder (405). At the same time, rotating cylinder (402) drives rotating arm (403) to rotate and causes clamping block (404) to contact the side wall of cylinder (405). When floating cylinder (406) is started, its telescopic end rises, so that it abuts against cylinder (405) to achieve positioning. (2) The cylinder (405) is pressed, and the telescopic cylinder (301) is started to drive the telescopic shaft (302) to move. The telescopic shaft (302) drives the swing arm (304) to rotate on the top plate (203) through the pin (303). When the middle part of the swing arm (304) rotates around the top plate (203), it drives the gripper (306) to press against the upper side of the cylinder (405). When the swing arm (304) rotates, the pin (303) moves in the long hole (305) to achieve stable rotation of the swing arm (304). (3) Cylinder barrel (405) machining: The cylinder barrel (405) is machined at both ends and top on the machining platform (101). The mounting assembly (200) rotates between the four-axis base (103) and the tailstock (102) to achieve angle adjustment during machining. At the same time, the machining platform (101) is mounted on the machine tool base for translation adjustment. During machining, the clamping cylinder (401) retracts to avoid interference with the tool. (4) The cylinder (405) is limited. After processing, the micro cylinder (513) is started. The extension end of the micro cylinder (513) pushes the clamping plate (511) to rotate, so that the clamping plate (511) is clamped on the side wall of the cylinder (405). Then the extension cylinder (301), clamping cylinder (401), rotating cylinder (402) and floating cylinder (406) are withdrawn, so that the cylinder (405) is clamped and fixed by the clamping plate (511). (5) Adjust the cylinder (405), start the micro motor (508) to drive the output shaft (509) to rotate in the connecting plate (507), the output shaft (509) drives the gear (510) to rotate and move on the gear plate, at this time the connecting plate (507) drives the slide plate (506) to slide in the track (504), thereby driving the fixed cylinder (405) to rotate. After adjustment, continue to clamp and position the cylinder (405), close the micro cylinder (513), the elastic element (512) resets the clamping plate (511), start the micro motor (508) to drive the slide plate (506) and connecting plate (507) to reset, for subsequent processing.

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