A chain link cutting device and method

Abstract

The application discloses a chain track joint fine cutting device and method, and relates to the technical field of chain track joint processing.The application comprises a rack, the inner bottom of the rack is fixedly provided with a lower positioning die for positioning a chain track joint, the inner top of the rack is provided with an upper pressing plate driven by a hydraulic pressure, the inner wall of the rack is fixedly provided with a lifting linear slide rail module, the lifting linear slide rail module is provided with a rotary driving platform, and the rotary driving platform is provided with a plurality of push-cutting hydraulic cylinders.The inner cutting edges are arranged at the wide edge of the most marginal trapezoidal cutter and the narrow edge of the two outer cutters, after the processing of the reference plane is completed, the rising and rotating actions of the assembled cutter can be used to once complete the burr scraping of the vertical inner wall and the circular arc inner wall of the assembled hole, the manual polishing or the drum deburring process does not need to be additionally increased, the production cycle is shortened, the hole wall scratch and the size deviation caused by manual polishing are avoided, and the assembly precision is obviously improved.

Description

Technical Field

[0001] This invention relates to the field of track link processing technology, specifically to a track link precision cutting device and method. Background Technology

[0002] Track links are the core load-bearing components of the track walking system of engineering machinery. The accuracy of the reference plane of the mounting hole and the quality of the inner wall directly determine the coaxiality of the pin and bushing assembly and the overall walking reliability of the machine.

[0003] Currently, the machining of assembly holes in track links mainly adopts a one-time forming process using an integral flat pusher, shortening the production cycle to 12-15 seconds per piece. However, this process concentrates the cutting load on the entire tool, with a maximum cutting force of 120-150kN, requiring a large press of 160 tons or more. Furthermore, it has extremely poor adaptability to fluctuations in the forging blank allowance; when the blank allowance fluctuates by more than ±0.15mm, it can lead to pusher breakage or workpiece clamping deformation, resulting in a scrap rate as high as 2%-3%. In addition, the integral pusher needs to be replaced entirely after wear, resulting in high maintenance costs and long downtime. Moreover, the existing process cannot simultaneously clean the burrs on the inner wall of the assembly hole while machining the reference plane, requiring additional manual grinding or tumbling deburring processes, which not only extends the production cycle by 20% but also easily causes scratches on the hole wall. Summary of the Invention

[0004] The purpose of this invention is to provide a track link precision cutting device and method to solve the above problems.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution: A precision cutting device for track links includes a frame, a lower positioning mold for positioning track links is fixedly installed at the bottom inner side of the frame, a hydraulically driven upper pressure plate is provided at the top inner side of the frame, a lifting linear slide rail module is fixedly installed on the inner wall of the frame, a rotary drive platform is installed on the lifting linear slide rail module, and a plurality of pushing hydraulic cylinders are installed on the turntable of the rotary drive platform. It also includes an assembly tool, which is a cuboid in shape. The assembly tool includes several trapezoidal tools and two outer tools. The trapezoidal tools and the two outer tools are mounted on corresponding push hydraulic cylinders. The trapezoidal tools are arranged side by side, and the wide and narrow sides of adjacent trapezoidal tools are on the same straight line. The two outer tools are located on both sides of the side-by-side trapezoidal tools, and the side of the outer tool closest to the trapezoidal tool is a bevel that fits tightly against the trapezoidal tool. The front ends of the trapezoidal tools and the outer tools are all provided with V-shaped cutting edges. The wide edges of the two outermost trapezoidal tools and the narrow edges of the two outer tools are provided with inner cutting edges. The distance from the inner cutting edge to the center of the assembly tool is half the width of the assembly hole 11.

[0006] Furthermore, the rotary drive platform is provided with a mounting assembly on its turntable. The mounting assembly is used to mount the pusher hydraulic cylinder. The mounting assembly includes a mounting frame, a sleeve frame, and a connecting plate. The mounting frame is fixedly mounted on the turntable of the rotary drive platform by bolts, and the mounting frame and the sleeve frame are connected by the connecting plate.

[0007] Furthermore, two interlocking hydraulic control rings are installed on the rotary drive platform. A sealing ring is rotatably installed on the outer side of the hydraulic control ring, and several wireless solenoid valves are installed on the outer side of the sealing ring. The wireless solenoid valves are connected to the push hydraulic cylinder through hydraulic pipes. The two hydraulic control rings control the extension and retraction of the push hydraulic cylinder respectively.

[0008] Furthermore, a cutting fluid pipe is provided on the inner top of the frame, and the cutting fluid pipe is inclined toward the mounting hole on the track link.

[0009] Furthermore, the rotary drive platform and the assembly tool are both provided in two sets, which can simultaneously process two assembly holes on the track link.

[0010] Furthermore, the rotary drive platform and assembly tools are each provided in four sets, arranged symmetrically in pairs, which can simultaneously process the two assembly holes on the two symmetrical track links.

[0011] Furthermore, the lifting linear guide module consists of a servo motor, a ball screw, a guide rail, and a slide block. The guide rail adopts a heavy-duty ball linear guide rail, with two slide blocks for each guide rail, and the ball screw adopts a large lead precision ball screw.

[0012] Furthermore, the bottom of the lower positioning mold is provided with a base that can move laterally left and right, and the base is controlled by a screw to move laterally.

[0013] A method for precision cutting of track links includes the following steps: S1. Rough turning of the assembly hole reference plane: First, use the lower trapezoidal tools and two external tools to form a preliminary tool to rough turn the assembly hole reference plane. The cutting surface is comb-shaped. Then, the assembly tool is flipped by rotating the drive table. The upper trapezoidal tools are used to perform a second rough turning of the reference plane. During the second cutting, the cutting surface will partially overlap with the first cutting surface, so that the rough turning surface is completely turned without any turning gap. S2. Assembly hole reference plane precision trolley: All trapezoidal tools and two external tools are brought together to form a complete assembly tool. Then, the rough-turned surface is precision turned. After the first precision turning is completed, the rotating drive table is rotated to flip the assembly tool and then a second precision turning is performed to make the precision-turned surface completely machined. S3. Scraping inside the assembly hole: The assembly tool rises as a whole to scrape the vertical inner wall of the assembly hole. After scraping, only the trapezoidal tool is used. The two outer tools are removed from the assembly hole. The rotating drive platform drives the closed trapezoidal tools to rotate, so that the inner cutting edge on the outermost trapezoidal tool is in contact with the arc inner wall of the assembly hole. The rotating drive platform drives the trapezoidal tool to rotate as a whole, and performs internal turning scraping on the arc inner wall to improve the overall assembly accuracy of the assembly hole.

[0014] The beneficial effects of this invention are as follows: This invention employs a unique design where the wide and narrow sides of adjacent trapezoidal cutting tools are collinear. The trapezoidal groove left by the first roughing pass is completely covered by the wide side of another set of cutting tools during the second roughing pass, fundamentally avoiding the cutting gaps of traditional segmented cutting tools. The two comb-like roughing passes result in high processing efficiency and good chip removal. At the same time, the two flipping and fine turning passes completely eliminate the unavoidable assembly gaps when the cutting tools are joined together, leaving no visible tool marks. This solves the problems of reduced pin contact area, local stress concentration, and accelerated wear caused by tool marks in traditional processes.

[0015] This invention sets a V-shaped symmetrical cutting edge at the front end of the trapezoidal tool and the outer tool. Regardless of whether the tool is facing down or flipped down, there is always an inclined surface that forms an effective front angle and back angle. The cutting force fluctuates little before and after flipping, which completely solves the fatal defects of traditional flat-blade tools, such as reversed cutting angle, sudden increase in cutting force, and high chipping rate after flipping.

[0016] This invention sets internal cutting edges on the wide edge of the outermost trapezoidal tool and the narrow edges of the two outer tools. After machining on the reference plane, the burrs on the vertical inner wall and the arc inner wall of the assembly hole can be removed in one go by the rising and rotating motion of the assembly tool. No additional manual grinding or deburring process is required, the production cycle is shortened, and the hole wall scratches and dimensional deviations caused by manual grinding are avoided, and the assembly accuracy is significantly improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the frame of the present invention; Figure 3 This is a schematic diagram of the rotary drive platform structure of the present invention; Figure 4 This is an exploded view of the assembled cutting tool of this invention; Figure 5 This is a schematic diagram of the internal scraping and cutting process of the present invention.

[0018] Reference numerals: 1. Frame; 2. Lower positioning mold; 3. Upper pressure plate; 4. Lifting linear slide rail module; 5. Rotary drive platform; 51. Mounting frame; 52. Sleeve frame; 53. Connecting plate; 6. Pushing hydraulic cylinder; 7. Trapezoidal tool; 71. V-shaped cutting edge; 8. External tool; 9. Hydraulic control ring; 91. Sealing rotating ring; 92. Wireless solenoid valve; 10. Cutting fluid pipe; 11. Assembly hole. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0020] Example 1, as Figures 1-5 As shown, a precision cutting device for chain links includes a frame 1. A lower positioning mold 2 for positioning chain links is fixedly installed at the bottom inner side of the frame 1. A hydraulically driven upper pressure plate 3 is provided at the top inner side of the frame 1. A lifting linear slide rail module 4 is fixedly installed on the inner wall of the frame 1. A rotary drive platform 5 is installed on the lifting linear slide rail module 4. A plurality of pushing hydraulic cylinders 6 are installed on the turntable of the rotary drive platform 5. It also includes an assembly tool, which is a cuboid in shape. The assembly tool includes several trapezoidal tools 7 and two outer tools 8. The trapezoidal tools 7 and two outer tools 8 are mounted on corresponding push-cutting hydraulic cylinders 6. The trapezoidal tools 7 are arranged side-by-side, with the wide and narrow sides of adjacent trapezoidal tools 7 on the same straight line. The two outer tools 8 are located on either side of the side-by-side trapezoidal tools 7, with the side of the outer tool 8 closest to the trapezoidal tool 7 having a bevel that fits tightly against the trapezoidal tool 7. Both the trapezoidal tools 7 and the outer tools 8 have V-shaped cutting edges 71 at their front ends. The outermost two trapezoidal tools 7 and the two outer tools 8 have inner cutting edges on their wide edges and narrow edges, respectively. The distance from the inner cutting edge to the center of the assembly tool is half the width of the assembly hole 11, which is... Figure 5 R in the text.

[0021] A cutting fluid pipe 10 is provided on the inner top of the frame 1, and the cutting fluid pipe 10 is inclined toward the mounting hole 11 on the track link.

[0022] Processing steps: (1) Clamping: Place the track link in the lower positioning mold 2, and the upper pressure plate 3 clamps the track link in the lower positioning mold 2 from above under the action of hydraulic drive; (2) Rough turning of the reference plane of assembly hole 11: By controlling the corresponding push hydraulic cylinder 6, several trapezoidal tools 7 and two external tools 8 are extended simultaneously to form a preliminary tool, which is inserted into the assembly hole 11 to perform rough turning on the reference plane of the assembly hole 11. The cutting surface is comb-shaped. Then, the preliminary tool is controlled to exit the assembly hole 11. The assembly tool is rotated by rotating the drive platform 5 to flip the assembly tool as a whole. At this time, the tool below turns upward and the tool above turns downward. By controlling the corresponding push hydraulic cylinder 6, several trapezoidal tools 7 are extended simultaneously to form a secondary tool to perform a second rough turning on the reference plane. Since trapezoidal tools 7 are used and the wide and narrow sides of adjacent trapezoidal tools 7 are on the same straight line, the first rough turning leaves The trapezoidal groove is completely covered by the wide side of another set of trapezoidal tools 7 during the second roughing pass. Therefore, during the second cutting, the cutting surface will partially overlap with the first cutting surface. This means that there will be no gaps as easily occurs during normal offset cutting, allowing the roughing surface to be completely machined. Since the turning end face is provided with a V-shaped cutting edge 71, it can still generate a stable turning force after flipping. The two inclined surfaces of the V-shaped cutting edge 71 are symmetrically distributed with an included angle of 170°-175°. The included angle between each inclined surface and the end face is 2.5°-5°. Regardless of whether the tool face is down or flipped down, there is always an inclined surface that forms an effective rake angle and clearance angle of 2.5°-5°. The cutting angles on both sides are exactly the same, and the cutting force, cutting temperature, and chip morphology are completely consistent.

[0023] (3) Assembly Hole 11 Reference Plane Precision Push Cart: All trapezoidal tools 7 and two external tools 8 are brought together to form a complete assembly tool. Then, the rough-turned surface is precision turned. After the first precision turning is completed, the rotating drive table 5 is rotated to flip the assembly tool, and then a second precision turning is performed. Since the gap between adjacent tools after flipping will not produce a cutting gap after the precision turning, the precision-turned surface is completely turned. The use of two comb-shaped rough turnings can quickly remove most of the turning part. Combined with two flipping precision turnings, the completeness of the cutting surface is ensured while improving the cutting accuracy. Track links generally use high-strength alloy steels such as 40MnB, 42CrMo, and 30CrMnTi. After forging, the hardness reaches HB220-280, and there is a forging hardened layer of 0.2-0.5mm. In traditional cutting processes, problems such as tool chipping and excessive wear are very likely to occur. This process completely solves this problem.

[0024] (4) Scraping inside the assembly hole 11: The assembly tool rises as a whole and scrapes the vertical inner wall of the assembly hole 11 through the inner cutting edge of the outer tool 8. After scraping, only the trapezoidal tool 7 is used. The two outer tools 8 are removed from the assembly hole 11. The rotating drive platform 5 drives the closed trapezoidal tool 7 to rotate, so that the inner cutting edge on the outermost trapezoidal tool 7 is aligned with the arc inner wall of the assembly hole 11. The rotating drive platform 5 drives the trapezoidal tool 7 to rotate as a whole, and performs internal turning and scraping on the burrs of the arc inner wall to improve the overall assembly accuracy of the assembly hole 11.

[0025] This invention provides a specialized precision machining equipment for track links, which can complete the machining of the track link assembly hole 11 in one go with high efficiency and high quality, resulting in high machining efficiency.

[0026] In embodiment two, based on the above embodiment, an additional mounting assembly is provided on the turntable of the rotary drive platform 5. This mounting assembly is used to mount the pusher hydraulic cylinder 6. The mounting assembly includes a mounting frame 51, a sleeve frame 52, and a connecting plate 53. The mounting frame 51 is fixedly mounted on the turntable of the rotary drive platform 5 with bolts, and the mounting frame 51 and the sleeve frame 52 are connected by the connecting plate 53. This mounting assembly allows for quick replacement of the pusher hydraulic cylinder 6 and facilitates maintenance.

[0027] The lifting linear guide module 4 consists of a servo motor, a ball screw, guide rails, and slide blocks. The guide rails are heavy-duty ball linear guides, with two slide blocks on each guide rail. The ball screws are high-lead precision ball screws. This enables the lifting linear guide module 4 to meet the requirements of high rigidity against cutting forces, micron-level repeatability positioning accuracy, long-stroke smooth operation, and precise coordination with the flipping and pushing action.

[0028] In embodiment three, based on the above embodiments, two interlocking hydraulic control rings 9 are installed on the rotary drive platform 5. A sealing ring 91 is rotatably installed on the outer side of the hydraulic control ring 9. Several wireless solenoid valves 92 are installed on the outer side of the sealing ring 91. The wireless solenoid valves 92 are connected to the push hydraulic cylinder 6 through hydraulic pipes. The two hydraulic control rings 9 control the extension and retraction of the push hydraulic cylinder 6 respectively.

[0029] With the configuration of this embodiment, while the hydraulic cylinder 6 is being hydraulically controlled, the hydraulic pipeline will not affect the rotation of the rotary drive platform 5 to drive the assembled tool to rotate.

[0030] Example 4, based on the above examples, further includes two sets of rotary drive platform 5 and assembly cutters, capable of simultaneously machining two assembly holes 11 on the track link. This design allows for the machining of both assembly holes 11 on a single track link in one operation.

[0031] Example 5, based on the above examples, further includes four sets of rotary drive stage 5 and assembly cutters, arranged symmetrically in pairs, capable of simultaneously machining two assembly holes 11 on the two symmetrical track links. This design allows for the completion of machining two symmetrical track links in one operation, improving the overall assembly accuracy.

[0032] Example 6, based on the above examples, further includes a base at the bottom of the lower positioning mold 2 that can move laterally left and right, with the base controlled by a screw. This design allows for fine-tuning of the lower positioning mold 2, enabling the assembly hole 11 to be more accurately aligned with the assembly tool.

[0033] Example 7: A method for precision cutting of track links, comprising the following steps: S1. Rough turning of the reference plane of assembly hole 11: First, use the lower trapezoidal cutter 7 and two external cutters 8 to form a preliminary tool to rough turn the reference plane of assembly hole 11. The cutting surface is comb-shaped. Then, the assembly tool is flipped by rotating the drive table 5. The upper trapezoidal cutter 7 is used to perform a second rough turning of the reference plane. During the second cutting, the cutting surface will partially overlap with the first cutting surface, so that the rough turning surface is completely turned without any turning gap. S2, Assembly Hole 11 Reference Plane Fine Push Cart: All trapezoidal cutters 7 and two outer cutters 8 are brought together to form a complete assembly tool. Then, the rough-turned surface is fine-turned. After the first fine-turning is completed, the rotating drive table 5 is rotated to flip the assembly tool and then a second fine-turning is performed to make the fine-turned surface completely machined. S3. Scraping inside assembly hole 11: The assembly tool rises as a whole to scrape the vertical inner wall of assembly hole 11. After scraping, only trapezoidal tool 7 is used, and the two outer tools 8 are removed from assembly hole 11. The rotating drive platform 5 drives the closed trapezoidal tool 7 to rotate, so that the inner cutting edge on the outermost trapezoidal tool 7 is aligned with the arc inner wall of assembly hole 11. The rotating drive platform 5 drives the trapezoidal tool 7 to rotate as a whole, and performs internal turning scraping on the arc inner wall to improve the overall assembly accuracy of assembly hole 11.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A precision cutting device for track links, comprising a frame (1), characterized in that, The bottom of the frame (1) is fixedly installed with a lower positioning mold (2) for positioning the chain link, the top of the frame (1) is provided with a hydraulically driven upper pressure plate (3), the inner wall of the frame (1) is fixedly installed with a lifting linear slide rail module (4), a rotary drive platform (5) is installed on the lifting linear slide rail module (4), and a number of pushing hydraulic cylinders (6) are installed on the turntable of the rotary drive platform (5). It also includes an assembly tool. The assembly tool is a cuboid in shape. The assembly tool includes several trapezoidal tools (7) and two outer tools (8). The trapezoidal tools (7) and two outer tools (8) are installed on the corresponding push hydraulic cylinders (6). The trapezoidal tools (7) are arranged side by side, and the wide side and narrow side of the adjacent trapezoidal tools (7) are on the same straight line. The two outer tools (8) are located on both sides of the parallel trapezoidal tools (7). The side of the outer tool (8) close to the trapezoidal tool (7) is a slope and fits tightly with the trapezoidal tool (7). The front ends of the trapezoidal tools (7) and the outer tools (8) are all provided with V-shaped cutting edges (71). The wide edge of the two outermost trapezoidal tools (7) and the narrow edge of the two outer tools (8) are provided with inner cutting edges. The distance from the inner cutting edge to the center of the assembly tool is half the width of the assembly hole (11).

2. The track link precision cutting device according to claim 1, characterized in that, The rotary drive platform (5) has an installation assembly on its turntable. The installation assembly is used to install the pusher hydraulic cylinder (6). The installation assembly includes an installation frame (51), a sleeve frame (52), and a connecting plate (53). The installation frame (51) is fixedly installed on the turntable of the rotary drive platform (5) by bolts. The installation frame (51) and the sleeve frame (52) are connected by the connecting plate (53).

3. The track link precision cutting device according to claim 2, characterized in that, Two interlocking hydraulic control rings (9) are installed on the rotary drive platform (5). A sealing ring (91) is rotatably installed on the outer side of the hydraulic control ring (9). Several wireless solenoid valves (92) are installed on the outer side of the sealing ring (91). The wireless solenoid valves (92) are connected to the push hydraulic cylinder (6) through hydraulic pipes. The two hydraulic control rings (9) control the extension and retraction of the push hydraulic cylinder (6) respectively.

4. The track link precision cutting device according to claim 3, characterized in that, The inner top of the frame (1) is provided with a cutting fluid pipe (10), which is inclined toward the mounting hole (11) on the track link.

5. A track link precision cutting device according to claim 4, characterized in that, The rotary drive platform (5) and the assembly tool are both provided in two sets, which can simultaneously process the two assembly holes (11) on the track link.

6. The track link precision cutting device according to claim 5, characterized in that, The rotary drive platform (5) and the assembly tool are both set in four groups, symmetrically arranged in pairs, which can simultaneously process the two assembly holes (11) on the two symmetrical chain links.

7. The track link precision cutting device according to claim 1, characterized in that, The lifting linear guide module (4) consists of a servo motor, a ball screw, a guide rail and a slide block. The guide rail adopts a heavy-duty ball linear guide rail, and each guide rail has two slide blocks. The ball screw adopts a large lead precision ball screw.

8. The track link precision cutting device according to claim 1, characterized in that, The bottom of the lower positioning mold (2) is provided with a base that can move horizontally left and right, and the base is controlled by a screw to move horizontally.

9. A method for precision cutting of track links, using the precision cutting device for track links as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Rough turning of the reference plane of the assembly hole (11): First, use the lower trapezoidal cutter (7) and two external cutters (8) to form a preliminary tool to rough turn the reference plane of the assembly hole (11). The cutting surface is comb-shaped. Then, the assembly tool is flipped by rotating the drive table (5). The upper trapezoidal cutter (7) is used to perform a second rough turning of the reference plane. During the second cutting, the cutting surface will overlap with the first cutting surface to make the rough turning surface completely turned without any turning gap. S2, Assembly hole (11) reference plane fine pusher: All trapezoidal tools (7) and two external tools (8) are brought together to form a complete assembly tool. Then the rough turning surface is fine turned. After the first fine turning is completed, the rotating drive table (5) is rotated to flip the assembly tool and then the second fine turning is performed to make the fine turning surface completely turned. S3. Scraping inside the assembly hole (11): The assembly tool rises as a whole to scrape the vertical inner wall of the assembly hole (11). After scraping, only the trapezoidal tool (7) is used. The two outer tools (8) are removed from the assembly hole (11). The rotating drive platform (5) drives the closed trapezoidal tool (7) to rotate, so that the inner cutting edge on the outermost trapezoidal tool (7) is aligned with the arc inner wall of the assembly hole (11). The rotating drive platform (5) drives the trapezoidal tool (7) to rotate as a whole, and the burrs on the arc inner wall are internally scraped to improve the overall assembly accuracy of the assembly hole (11).

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