A piston pin heat treatment post straightening and fine grinding composite processing device

Abstract

The present application belongs to the technical field of piston pin processing equipment, and in particular to a straightening and fine grinding combined processing device for piston pins after heat treatment, which comprises a mounting frame, a round rod inserted into the through hole at the upper part of the mounting frame, and a clamping seat fixedly connected to the upper end of the round rod, the clamping seat being used for clamping and fixing the end of the piston pin, an angle adjusting module being fixedly connected to one side of the clamping seat on the upper surface of the mounting frame, and the angle adjusting module comprising a vertical plate. The two straightening wheels cooperatively arranged can be adjusted in angle, and can realize multi-stage straightening operation of the piston pin through the first, second and third straightening sections arranged therein, and the tail of the third straightening section is embedded with a polishing liner plate, so as to realize polishing operation of the straightened piston pin, and the straightening and polishing treatment of the piston pin can be quickly realized, and the problem of separation of the straightening and fine grinding processes and low processing efficiency in the processing of the piston pin is solved.

Description

Technical Field

[0001] This invention relates to the field of piston pin processing equipment technology, specifically to a composite processing device for straightening and fine grinding of piston pins after heat treatment. Background Technology

[0002] As a key force-transmitting component between the engine piston and connecting rod, the piston pin's machining accuracy directly affects the engine's operational stability and service life. After heat treatment, the piston pin is prone to bending deformation due to thermal stress, thus requiring straightening. Furthermore, the surface of the piston pin after heat treatment may have defects such as oxide scale and burrs, necessitating precision grinding to ensure its surface roughness and dimensional accuracy.

[0003] In existing technologies, piston pin straightening and precision grinding are typically completed in two independent processes: first, the heat-treated piston pin is straightened using a straightening device, and then the straightened piston pin is transferred to a precision grinding device for grinding. This processing method is cumbersome and time-consuming, which not only reduces the overall processing efficiency but may also cause the piston pin to deform again during the transfer process, affecting the processing quality. In addition, existing straightening devices mostly use a single straightening structure, which cannot achieve graded straightening. For piston pins with large deformation, the straightening effect is poor, making it difficult to meet the requirements of high-precision processing. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a composite processing device for straightening and fine grinding of piston pins after heat treatment. By setting two cooperating straightening wheels with adjustable angles, the device enables multi-stage straightening of piston pins through its own first, second, and third straightening sections. Furthermore, a grinding liner is embedded at the tail of the third straightening section to perform grinding operations on the straightened piston pins. This device can quickly achieve both straightening and grinding of piston pins, solving the problems of separation of straightening and fine grinding processes and low processing efficiency in piston pin processing.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0008] A composite processing device for straightening and fine grinding of piston pins after heat treatment includes a mounting frame, a round rod inserted into a through hole in the upper part of the mounting frame, and a clamping seat fixedly connected to the upper end of the round rod. The clamping seat is used to clamp and fix the end of the piston pin. An angle adjustment module is fixedly connected to one side of the upper surface of the mounting frame located on the clamping seat. The angle adjustment module includes: a vertical plate, which is fixedly connected to the mounting frame through a base set at its lower end; and two supports, which are symmetrically fixed to the vertical plate. A shaft is rotatably connected to each of the two supports, and a straightening wheel is coaxially fixedly connected to each of the two shafts. The two straightening wheels cooperate to realize the straightening and fine grinding operation of the piston pin to be processed.

[0009] Furthermore, the straightening wheel includes a wheel body coaxially fixedly connected to the shaft. The outer edge of the wheel body is provided with a notch, a first straightening section, a second straightening section and a third straightening section in sequence around its own circumference. The first straightening section, the second straightening section and the third straightening section are all provided with arc-shaped grooves, and the groove diameters of the arc-shaped grooves on the first straightening section, the second straightening section and the third straightening section decrease in sequence, so as to realize the staged straightening operation of the piston pin.

[0010] Furthermore, the arc-shaped groove of the third straightening section is provided with an installation groove extending to the notch, and a grinding liner is embedded in the installation groove of the third straightening section.

[0011] Furthermore, the grinding liner is screwed into the mounting groove of the third straightening section.

[0012] Furthermore, gears are coaxially fixedly connected to both shafts, and a guide rail is fixedly connected to one side of the vertical plate along its length. A rack mechanism is slidably connected to the guide rail. The rack mechanism includes: a frame plate with a slider fixedly connected to its back, the slider being slidably connected to the guide rail; and two rack bodies, both of which are fixedly connected to the frame plate by bolts. The rack bodies mesh with corresponding gears to drive the rotation of the shafts, thereby adjusting the angle of the straightening wheel.

[0013] Furthermore, a second cylinder is installed on the top of the vertical plate, and the lower end of the piston rod of the second cylinder is fixedly connected to the frame plate.

[0014] Furthermore, a first cylinder is mounted on the mounting frame, and a connecting plate is fixedly connected between the lower end of the piston rod of the first cylinder and the lower end of the round rod.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides a combined processing device for straightening and fine grinding of piston pins after heat treatment, which has the following beneficial effects:

[0017] This invention integrates straightening and fine grinding processes into one unit using two cooperating straightening wheels. After the piston pin undergoes graded straightening, its surface is simultaneously finely ground by the arc-shaped grinding liner on the third straightening section. Two processing operations can be completed in a single step, effectively simplifying the processing flow, reducing the piston pin transfer links, avoiding secondary deformation during transfer, and significantly improving processing efficiency. Furthermore, the straightening wheels are equipped with a first, second, and third straightening section, with the arc-shaped groove diameter decreasing sequentially. This method enables graded straightening of the piston pin, avoiding secondary deformation damage caused by single-stage straightening. The multi-stage straightening method is gentler and more stable, and it gradually corrects piston pins with different deformation amounts. Compared to a single straightening structure, it offers better straightening effect and higher precision, meeting the high-precision processing requirements of piston pins. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the angle adjustment module in this invention;

[0020] Figure 3 This is a schematic diagram of the rack and pinion mechanism in this invention;

[0021] Figure 4 This is a schematic diagram of the straightening wheel from a first-view perspective in this invention;

[0022] Figure 5 This is a schematic diagram of the straightening wheel from a second perspective in this invention;

[0023] Figure 6 This is a schematic diagram of the structure when the straightening wheel is disassembled in this invention;

[0024] Figure 7 This is a cross-sectional view of the straightening wheel in this invention.

[0025] In the diagram: 1. Mounting frame; 2. First cylinder; 3. Straightening wheel; 31. Wheel body; 32. Notch; 33. Arc groove; 34. First straightening section; 35. Second straightening section; 36. Third straightening section; 37. Grinding liner; 38. Mounting groove; 4. Angle adjustment module; 41. Vertical plate; 42. Guide rail; 43. Support; 44. Gear; 45. Base; 46. Rack mechanism; 461. Frame plate; 462. Rack body; 463. Slider; 47. Shaft; 48. Second cylinder; 5. Clamping seat; 6. Round rod; 7. Connecting plate. Detailed Implementation

[0026] 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.

[0027] Example

[0028] like Figures 1-7 As shown in the figure, an embodiment of the present invention provides a composite processing device for straightening and fine grinding of piston pins after heat treatment. The device includes a mounting frame 1, a round rod 6 inserted into the through hole at the upper part of the mounting frame 1, and a clamping seat 5 fixedly connected to the upper end of the round rod 6. The clamping seat 5 is used to clamp and fix the end of the piston pin. An angle adjustment module 4 is fixedly connected to one side of the clamping seat 5 on the upper surface of the mounting frame 1. The angle adjustment module 4 includes: a vertical plate 41, which is fixedly connected to the mounting frame 1 through a base 45 at the lower end; and two supports 43, which are symmetrically fixed to the vertical plate 41. A shaft 47 is rotatably connected to each of the two supports 43, and a straightening wheel 3 is coaxially fixedly connected to each of the two shafts 47. The two straightening wheels 3 cooperate to realize the straightening and fine grinding operation of the piston pin to be processed.

[0029] It should be noted that the mounting frame 1 serves as the load-bearing foundation of the entire device, providing stable mounting support for all components. The round rod 6 is inserted into the through hole at the top of the mounting frame 1 and can slide up and down along the through hole. The clamping seat 5 fixed at its upper end is used to firmly clamp and fix the end of the piston pin, ensuring that the piston pin will not shift or shake during processing. The angle adjustment module 4 fixed on one side of the clamping seat 5 on the upper surface of the mounting frame 1 is used to adjust the angle of the straightening wheel 3, thereby realizing the graded straightening operation of the piston pin. The vertical plate 41 in the angle adjustment module 4 is fixed to the mounting frame 1 through the base 45 at the lower end. Two supports 43 symmetrically fixed on the vertical plate 41 are used to support the shaft 47 and allow the shaft 47 to rotate freely. The shaft 47 is coaxially fixedly connected to the straightening wheel 3. When the shaft 47 rotates, it will drive the straightening wheel 3 to rotate synchronously. The two straightening wheels 3 cooperate with each other to clamp, straighten, and fine grind the piston pin to be processed after clamping and fixing, realizing the completion of two processing tasks in one process.

[0030] like Figures 4-7As shown, in some embodiments, the straightening wheel 3 includes a wheel body 31 coaxially fixedly connected to the shaft 47. The outer edge of the wheel body 31 is provided with a notch 32, a first straightening section 34, a second straightening section 35 and a third straightening section 36 in sequence around its own circumference. The first straightening section 34, the second straightening section 35 and the third straightening section 36 are all provided with arc-shaped grooves 33, and the groove diameters of the arc-shaped grooves 33 on the first straightening section 34, the second straightening section 35 and the third straightening section 36 decrease in sequence, so as to realize the staged straightening operation of the piston pin.

[0031] It should be noted that the wheel body 31 rotates synchronously with the shaft 47, and the notch 32 on its outer edge facilitates the smooth placement and removal of the piston pin, avoiding interference. The diameter of the arc groove 33 on the first straightening section 34, the second straightening section 35, and the third straightening section 36 decreases sequentially. The piston pin passes through the three straightening sections sequentially as the wheel body 31 rotates, achieving graded straightening, effectively avoiding secondary deformation, and further improving the straightening accuracy.

[0032] like Figures 4-7 As shown, in some embodiments, the arc-shaped groove 33 of the third straightening section 36 is provided with a mounting groove 38 extending to the notch 32, and a grinding liner 37 is embedded in the mounting groove 38 of the third straightening section 36.

[0033] It should be noted that a grinding liner 37 is embedded in the mounting groove 38 of the third straightening section 36. After the piston pin completes the final straightening in the third straightening section 36, it comes into full contact with the grinding liner 37. With the help of the rotational power of the straightening wheel 3 and the lifting operation of the clamping seat 5, the surface of the piston pin is finely ground, and the straightening and fine grinding processes are completed simultaneously, effectively improving the processing efficiency.

[0034] like Figures 4-7 As shown, in some embodiments, the grinding liner 37 is screwed into the mounting groove 38 of the third straightening section 36.

[0035] It should be noted that the grinding liner 37 is installed in the mounting groove 38 by screws, which not only ensures that it does not loosen during processing and that the fine grinding effect is stable, but also facilitates the disassembly and replacement of the worn grinding liner 37 in the later stage, effectively reducing equipment maintenance costs.

[0036] like Figure 2 and Figure 3As shown, in some embodiments, gears 44 are coaxially fixedly connected to both shafts 47, and a guide rail 42 is fixedly connected to one side of the vertical plate 41 along the length of the vertical plate 41. A rack mechanism 46 is slidably connected to the guide rail 42. The rack mechanism 46 includes: a frame plate 461, on the back of which a slider 463 is fixedly connected, and the slider 463 is slidably connected to the guide rail 42; and two rack bodies 462, both of which are fixedly connected to the frame plate 461 by bolts. The rack bodies 462 mesh with the corresponding gears 44 to realize the rotation drive of the shafts 47, thereby realizing the angle adjustment of the straightening wheel 3.

[0037] It should be noted that the gear 44 on the shaft 47 meshes with the rack body 462 of the rack mechanism 46. The frame plate 461 slides smoothly along the guide rail 42 through the slider 463, driving the rack body 462 to move synchronously, thereby driving the gear 44, shaft 47 and straightening wheel 3 to rotate, realizing flexible adjustment of the angle of the straightening wheel 3, and thus realizing multi-stage straightening operation of the piston pin.

[0038] like Figure 2 and Figure 3 As shown, in some embodiments, a second cylinder 48 is installed on the top of the vertical plate 41, and the lower end of the piston rod of the second cylinder 48 is fixedly connected to the frame plate 461.

[0039] It should be noted that the second cylinder 48 is installed on the top of the vertical plate 41. When its piston rod extends or retracts, it drives the frame plate 461 to slide smoothly along the guide rail 42, thereby realizing the lifting and lowering drive of the frame plate 461.

[0040] like Figure 1 As shown, in some embodiments, a first cylinder 2 is mounted on the mounting frame 1, and a connecting plate 7 is fixedly connected between the lower end of the piston rod of the first cylinder 2 and the lower end of the round rod 6.

[0041] It should be noted that the first cylinder 2 drives the round rod 6 to slide up and down through the connecting plate 7, which in turn drives the clamping seat 5 and the piston pin fixed thereon to move synchronously, so that the piston pin can extend and retract back and forth between the two straightening wheels 3, realizing the straightening and grinding of the piston pin, and at the same time facilitating the loading and unloading of the piston pin; it should also be noted that the present invention can meet the needs of large-sized piston pins, such as large piston pins used in large diesel engines, construction machinery, heavy trucks, and mining engines.

[0042] The working principle and usage steps of this invention are as follows: First, the heat-treated piston pin end is clamped and fixed on the clamping seat 5. The second cylinder 48 is activated, and the piston rod of the second cylinder 48 extends and retracts, causing the frame plate 461 to slide along the guide rail 42 via the slider 463. The rack body 462 on the frame plate 461 drives the gear 44 meshing with it to rotate. The gear 44 drives the shaft 47 to rotate on the support 43, thereby driving the straightening wheel 3 to rotate to a suitable angle so that the notches 32 of the two straightening wheels 3 correspond to the piston pin position. Then, the first cylinder 2 is activated, and the first cylinder 2 drives the connecting plate 7 to... The moving rod 6 slides up and down, and the rod 6 drives the clamping seat 5 and the piston pin to move synchronously, so that the piston pin enters the first straightening section 34, the second straightening section 35 and the third straightening section 36 of the two straightening wheels 3 in sequence (the straightening wheels 3 can rotate and the angle can be adjusted). The graded straightening is completed by the arc-shaped grooves 33 with the groove diameter decreasing in sequence on the three straightening sections. At the same time, the grinding liner 37 in the mounting groove 38 of the third straightening section 36 performs synchronous fine grinding on the straightened piston pin. After the processing is completed, the first cylinder 2 drives the piston pin to reset, and the clamping seat 5 can be released to take out the processed piston pin.

[0043] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. 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 composite machining device for straightening and precision grinding of piston pins after heat treatment, characterized in that: The mounting includes a mounting frame (1), a round rod (6) inserted into the upper through hole of the mounting frame (1), and a clamping seat (5) fixedly connected to the upper end of the round rod (6). The clamping seat (5) is used to clamp and fix the end of the piston pin. An angle adjustment module (4) is fixedly connected to one side of the upper surface of the mounting frame (1) located on the clamping seat (5). The angle adjustment module (4) includes: The vertical plate (41) is fixedly connected to the mounting frame (1) by a base (45) provided at the lower end; Supports (43) are provided in two symmetrically fixed on vertical plates (41). Each of the two supports (43) is rotatably connected to a shaft (47), and each of the two shafts (47) is coaxially fixedly connected to a straightening wheel (3). The two straightening wheels (3) cooperate to realize the straightening and fine grinding operation of the piston pin to be processed.

2. The piston pin heat treatment straightening and fine grinding composite processing device according to claim 1, characterized in that: The straightening wheel (3) includes a wheel body (31) coaxially fixedly connected to the shaft (47). The outer edge of the wheel body (31) is provided with a notch (32), a first straightening section (34), a second straightening section (35) and a third straightening section (36) in sequence around its own circumference. The first straightening section (34), the second straightening section (35) and the third straightening section (36) are all provided with arc-shaped grooves (33), and the groove diameters of the arc-shaped grooves (33) on the first straightening section (34), the second straightening section (35) and the third straightening section (36) decrease in sequence to realize the graded straightening operation of the piston pin.

3. The piston pin heat treatment straightening and fine grinding composite processing device according to claim 2, characterized in that: The third straightening section (36) has an arc groove (33) with an installation groove (38) extending to the notch (32), and a grinding liner (37) is embedded in the installation groove (38) of the third straightening section (36).

4. The piston pin heat treatment straightening and fine grinding composite processing device according to claim 3, characterized in that: The grinding liner (37) is screwed into the mounting groove (38) of the third straightening section (36).

5. The piston pin heat treatment straightening and fine grinding composite processing device according to claim 1, characterized in that: Gears (44) are coaxially fixedly connected to both shafts (47), and a guide rail (42) is fixedly connected to one side of the vertical plate (41) along the length of the vertical plate (41). A rack mechanism (46) is slidably connected to the guide rail (42), and the rack mechanism (46) includes: The frame plate (461) has a slider (463) fixedly connected to its back, and the slider (463) is slidably connected to the guide rail (42); There are two rack bodies (462). Both rack bodies (462) are fixedly connected to the frame plate (461) by bolts. The rack bodies (462) mesh with the corresponding gears (44) to realize the rotation drive of the shaft (47) and then realize the angle adjustment of the straightening wheel (3).

6. The piston pin heat treatment straightening and fine grinding composite processing device according to claim 5, characterized in that: The top of the vertical plate (41) is equipped with a second cylinder (48), and the lower end of the piston rod of the second cylinder (48) is fixedly connected to the frame plate (461).

7. The piston pin heat treatment straightening and fine grinding composite processing device according to claim 1, characterized in that: The mounting frame (1) is equipped with a first cylinder (2), and a connecting plate (7) is fixedly connected between the lower end of the piston rod of the first cylinder (2) and the lower end of the round rod (6).

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