A method for manufacturing a compressor piston

Abstract

This invention provides a method for manufacturing a compressor piston. The compressor piston includes a hinge hole and a snap-fit ​​position with a width smaller than the hinge hole. The hinge hole is used to connect a transmission component to achieve eccentric rotation of the compressor piston and crankshaft, thereby compressing air. The manufacturing method includes: preparing a piston body; milling the piston body to form an initial groove on the outer wall of the piston body; the initial groove penetrating both end faces of the piston body; using a broach to enlarge the end of the initial groove away from the outer wall to form the hinge hole; the diameter of the hinge hole is larger than the width of the initial groove; and surface treating the piston body to obtain the compressor piston. This invention solves the problem of low processing efficiency caused by the need for repeated rough and fine grinding of the piston hinge surface to achieve higher precision.

Description

Technical Field

[0001] This invention relates to the field of compressor piston technology, and more specifically, to a method for manufacturing a compressor piston. Background Technology

[0002] A rotary compressor utilizes a cylindrical piston eccentrically mounted on a crankshaft, which undergoes planetary rolling motion within a cylindrical cylinder. This periodically changes the volume of the crescent-shaped space between the cylinder and the piston, thus completing the intake, compression, and exhaust processes. Rotary compressors are widely used in small and medium-sized refrigeration equipment such as household air conditioners and refrigerators due to their high efficiency, compact structure, small size, and light weight.

[0003] The outer wall of the hinged piston of the rotary compressor is provided with an axially penetrating groove. The vane has a head end and a tail end. The shape of the head end matches the groove and can be oscillatingly fitted into the groove so that the vane and the hinged piston form a hinge.

[0004] Currently, when processing the hinge groove of a compressor piston, multiple processes such as machining and drilling are required, followed by repeated rough and fine grinding of the hinge groove in order to achieve higher precision on the sidewall of the hinge groove, resulting in low processing efficiency. Summary of the Invention

[0005] The problem solved by this invention is that the hinge groove of the piston needs to be repeatedly rough and fine ground to achieve higher precision, resulting in low processing efficiency.

[0006] To address the aforementioned problems, this invention provides a method for manufacturing a compressor piston. The compressor piston includes a hinge hole and a snap-fit ​​position with a width smaller than the hinge hole. The hinge hole is used to connect a transmission component to achieve eccentric rotation of the compressor piston and crankshaft, thereby compressing air. The manufacturing method includes: preparing a piston body; milling the piston body to form an initial groove on the outer wall of the piston body; the initial groove penetrating both end faces of the piston body; using a broach to enlarge the end of the initial groove away from the outer wall to form the hinge hole; the diameter of the hinge hole is larger than the width of the initial groove; and surface treating the piston body to obtain the compressor piston.

[0007] The technical effects achieved by adopting this technical solution are as follows: The articulated groove can be quickly removed by milling, and the size can be close to that of the articulated hole and the snap-fit ​​position. This reduces the cutting amount of the broach. On the one hand, the number of broach teeth can be effectively reduced, and there is no need to prepare fine broach teeth to break the wall and form the initial groove. A broach with a size slightly larger than the initial groove can be used directly for broaching, which effectively reduces the broach preparation cost. On the other hand, the cutting amount of the broach is less, which reduces the wear of the broach and increases the service life of the broach, further reducing the cost.

[0008] Compared to milling cutters and other machining methods, broaching offers higher precision and efficiency. By rapidly drawing the broaching cutters through the initial groove with linearly arranged and gradually changing cutter teeth, roughing and finishing can be completed in one go within tens of seconds. This meets the requirements of high efficiency and high precision in the machining of articulated holes, ensuring the verticality of the compressor piston during installation and preventing wear and noise during articulated transmission.

[0009] Furthermore, since the width of the snap-fit ​​position is smaller than the diameter of the hinge hole, if a milling cutter matching the hinge hole is used for finish milling, it is impossible to feed and retract the cutter. If a milling cutter smaller than the hinge hole is used for finish milling the hinge hole, it is difficult to guarantee roundness and the accuracy is poor. However, using a broach allows for axial feed and retraction, ensuring both machining efficiency and accuracy.

[0010] Furthermore, the initial groove is a U-shaped groove, and the initial groove includes: a straight groove communicating with the outer wall, and an initial hole located at the end of the straight groove away from the outer wall; the milling of the piston body to form the initial groove on the outer wall of the piston body specifically includes: milling the piston body to form the straight groove and the initial hole.

[0011] The technical effects achieved by adopting this technical solution are as follows: the straight groove and the initial hole are formed in one milling operation, which is more efficient and does not require changing tools or processes; and the fact that they are formed in the same process and processed along the same predetermined milling route better ensures that the center of the initial hole is aligned with the center line of the straight groove, thereby achieving a better positioning effect for the initial hole and ensuring that no vibration occurs at the start of broaching, further improving the roundness and positional accuracy of the hinge hole.

[0012] Furthermore, the step of enlarging the end of the initial groove away from the outer wall using a broach to form a hinge hole specifically includes: enlarging the initial hole using a broach to form a hinge hole; wherein the diameter of the initial hole is 2.5mm to 4.8mm; and the diameter of the hinge hole is 2.8mm to 5.0mm.

[0013] The technical effects achieved by adopting this technical solution are as follows: Under the above-mentioned cutting allowance, the broach can remove the uneven surface left by milling, so that the inner wall of the hinge hole can obtain a lower roughness. Moreover, the moderate cutting allowance will not increase the broaching load, effectively extending the tool life and improving the machining accuracy.

[0014] Furthermore, the diameter of the initial hole is greater than the width of the straight groove; the width of the straight groove is 2.4 mm to 4.8 mm.

[0015] The technical effects achieved by adopting this technical solution are as follows: the straight groove forms a constricted structure compared to the initial hole, providing a positioning basis for subsequent snap-fit ​​forming; at the same time, it avoids the sidewall of the straight groove from chipping or deforming due to excessive force when drawing the hinge hole.

[0016] Furthermore, the distance from the center of the initial hole to the center of the piston body is L1, and the distance from the center of the hinge hole to the center of the piston body is L2; ​​wherein, L1 < L2.

[0017] The technical effect achieved by adopting this solution is as follows: the initial hole is moved inward, meaning that the amount of material removed from the side of the initial hole closer to the piston body center is less than the amount removed from the side farther from the piston body center. Therefore, when broaching the initial hole, the cutting force mainly acts on the side of the initial hole farther from the piston center, reducing the impact on the central area of ​​the piston body and ensuring the symmetry and strength of the overall compressor piston structure.

[0018] Furthermore, the distance from the end of the initial hole near the center of the piston body to the center of the piston body is L3, and the distance from the end of the hinge hole near the center of the piston body to the center of the piston body is L4; wherein, 0 < L3 - L4 ≤ 0.2 mm.

[0019] The technical effects achieved by adopting this technical solution are as follows: the broaching amount at the end of the initial hole near the center of the piston body is within the range of 0.2mm, which reduces the wear of the broach teeth and the deformation of the hinge hole, and improves the broaching accuracy at the end of the initial hole near the center of the piston body.

[0020] Furthermore, the method involves using a broach to enlarge the end of the initial groove away from the outer wall to form the hinge hole. Simultaneously, the manufacturing method also includes using a broach to enlarge the straight groove to form a snap-fit ​​position.

[0021] The technical effects achieved by adopting this solution are as follows: Using the same broach in a single broaching stroke, the enlargement of the hinge hole and the sidewall trimming of the straight groove can be completed simultaneously, effectively improving processing efficiency. Furthermore, it improves the dimensional accuracy and surface quality of the snap-fit ​​joint. The opening dimensional accuracy of the snap-fit ​​joint facilitates the assembly of the compressor vanes, and the symmetry of the snap-fit ​​joint ensures the consistency of the vane's oscillation on both sides during the hinge process.

[0022] Furthermore, after forming the hinge hole, the manufacturing method further includes chamfering one end of the straight groove that connects to the outer wall.

[0023] The technical effects achieved by adopting this solution are as follows: When the compressor vane swings relative to the compressor piston, the chamfer is used to avoid the side wall of the compressor vane and limit the swing range of the compressor vane, enabling the compressor vane to rotate stably. Performing the chamfering after the broaching and reaming process avoids the chamfer from deforming into the outer shape due to the broaching tool pressing against the initial groove and straight groove, thus preventing a decrease in precision.

[0024] Furthermore, the preparation of the piston body specifically includes: cutting and turning raw materials to prepare a semi-finished product; rough grinding the end face, outer wall and inner wall of the semi-finished product; and fine grinding the end face, outer wall and inner wall of the semi-finished product to obtain the piston body.

[0025] The technical effects achieved by adopting this technical solution are as follows: after the raw material is cut, a semi-finished product with basic dimensions can be obtained by turning; rough grinding can remove burrs generated during the cutting and turning process, so that the end face, outer wall and inner wall of the semi-finished product can be used as a reference for further processing; fine grinding of the end face, outer wall and inner wall can improve the accuracy of the reference; ensure the perpendicularity of the end face and the outer wall, and avoid the piston body being tilted when placed in the broaching tool, which would cause the hinge hole to tilt; ensure the cylindricity of the outer wall, and avoid the positional displacement of the hinge hole.

[0026] Furthermore, the surface treatment of the piston body to obtain the compressor piston specifically includes: fine grinding and honing of the inner wall of the hinge hole.

[0027] The technical effects achieved by adopting this technical solution are as follows: the inner wall of the hinge hole can be significantly improved in terms of dimensional accuracy and wear resistance after fine grinding; honing improves accuracy while forming a uniform micro-texture, enhancing the lubricant adsorption capacity and reducing the coefficient of friction with the compressor vane.

[0028] In summary, the above-mentioned technical solutions of this application can have one or more of the following advantages or beneficial effects: I) Milling the articulated groove first can quickly remove material, approaching the size of the articulated hole and the snap-fit ​​position, reducing the cutting amount of the subsequent broach; II) Reduce the wear of the broach, improve the service life of the broach, and further reduce costs; III) Roughing and finishing can be completed in one go within tens of seconds, meeting the requirements of high efficiency and high precision in the articulated hole machining process; IV) The initial hole is moved inward, that is, the broaching amount on the side of the initial hole closer to the center of the piston body is less than the broaching amount on the side of the initial hole farther from the center of the piston body. Therefore, when broaching the initial hole, the cutting force mainly acts on the side of the initial hole farther from the piston center, reducing the impact on the central area of ​​the piston body and ensuring the symmetry and strength of the overall structure of the compressor piston; V) Using the same broach in one broaching stroke, the enlargement of the articulated hole and the side wall trimming of the straight groove can be completed simultaneously, effectively improving the machining efficiency. Attached Figure Description

[0029] Figure 1 A flowchart illustrating a method for manufacturing a compressor piston provided by the present invention;

[0030] Figure 2 This is a schematic diagram of the piston body.

[0031] Figure 3 A schematic diagram of the structure for machining the initial groove on the piston body;

[0032] Figure 4 This is a schematic diagram of the specific structure of the initial groove;

[0033] Figure 5 This is a schematic diagram of the compressor piston.

[0034] Figure 6 This is a structural diagram of the hinge hole and snap-fit ​​position;

[0035] Figure 7 A schematic diagram of piston body broaching;

[0036] Figure 8 for Figure 7 A magnified view of a portion of region I.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100-Compressor piston; 110-Hinge hole; 120-Snap-fit ​​position; 200-Piston body; 210-Initial groove; 220-Initial hole; 230-Straight groove. Detailed Implementation

[0039] The purpose of this invention is to provide a method for manufacturing a compressor piston, which achieves efficient and high-precision machining of the articulated groove.

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] See Figures 1-8 This invention provides a method for manufacturing a compressor piston 100. The compressor piston 100 includes a hinge hole 110 and a snap-fit ​​position 120 with a width smaller than the hinge hole 110. The hinge hole 110 is used to connect a transmission component to achieve eccentric rotation of the compressor piston 100 and the crankshaft, thereby achieving air compression. The manufacturing method includes:

[0042] Step S1: Prepare piston body 200;

[0043] Step S2: Mill the piston body 200 to form an initial groove 210 on the outer wall of the piston body 200; the initial groove 210 passes through both ends of the piston body 200.

[0044] Step S3: Use a broach to enlarge the end of the initial groove 210 away from the outer wall to form a hinge hole 110; the diameter of the hinge hole 110 is larger than the width of the initial groove 210.

[0045] Step S4: Perform surface treatment on the piston body 200 to obtain the compressor piston 100.

[0046] In this embodiment, the articulation groove is first milled to quickly remove material, approaching the size of the articulation hole 110 and the snap-fit ​​position 120, reducing the cutting amount of the broach. On the one hand, the number of broach teeth can be effectively reduced, eliminating the need to prepare finer broach teeth to break the wall and form the initial groove 210. A broach with a size slightly larger than the initial groove 210 can be used directly for broaching, effectively reducing the broach manufacturing cost. On the other hand, the broach has less cutting amount, reducing broach wear, increasing broach service life, and further reducing costs.

[0047] Compared to milling cutters and other machining methods, broaching offers higher precision and efficiency. By rapidly drawing the broaching cutters through the initial groove 210 with linearly arranged and gradually changing cutter teeth, roughing and finishing can be completed in one go within tens of seconds. This meets the requirements of high efficiency and high precision in the machining process of the hinge hole 110, ensuring the verticality of the compressor piston 100 during installation and avoiding wear and noise during the hinge transmission process.

[0048] Furthermore, since the width of the snap-fit ​​position 120 is smaller than the diameter of the hinge hole 110, if a milling cutter matching the hinge hole 110 is used for finish milling, it is impossible to feed and retract the cutter. If a milling cutter smaller than the hinge hole 110 is used for finish milling the hinge hole 110, it is difficult to guarantee roundness and the accuracy is poor. However, using a broach allows for axial feed and retraction, ensuring both machining efficiency and accuracy.

[0049] In one specific embodiment, the initial groove 210 is a U-shaped groove, and the initial groove 210 includes: a straight groove 230 communicating with the outer wall, and an initial hole 220 located at the end of the straight groove 230 away from the outer wall; the piston body 200 is milled to form the initial groove 210 opened on the outer wall of the piston body 200, specifically including: milling the piston body 200 to form the straight groove 230 and the initial hole 220.

[0050] It should be noted that the straight groove 230 and the initial hole 220 are formed in one milling operation, which has higher cutting efficiency and does not require tool or process change. Furthermore, the fact that they are formed in the same process and machined along the same predetermined milling path better ensures that the center of the initial hole 220 is aligned with the center line of the straight groove 230, thereby achieving a better positioning effect for the initial hole 220. This ensures that no vibration will occur at the start of broaching and further improves the roundness and positional accuracy of the hinge hole 110.

[0051] The centerline of the straight groove 230 passes through the center of the piston; the milling process of the straight groove 230 and the initial hole 220 is carried out by a milling cutter with a diameter smaller than the width of the straight groove 230.

[0052] In one specific embodiment, when milling the piston body 200, the milling is performed in layers along the axial direction according to a predetermined path and infeed point.

[0053] In one specific embodiment, a broach is used to enlarge the end of the initial groove 210 away from the outer wall to form a hinge hole 110. Specifically, this includes: using a broach to enlarge the initial hole 220 to form a hinge hole 110; wherein the diameter of the initial hole 220 is 2.5 mm to 4.8 mm; and the diameter of the hinge hole 110 is 2.8 mm to 5.0 mm.

[0054] For example, the initial hole 220 may be 2.8 mm, 3.0 mm, or 3.2 mm, and there is no limitation here. The diameter of the hinge hole 110 is increased by 0.2 mm to 0.3 mm compared to the initial hole 220. For example, the diameter of the hinge hole 110 may be 3.0 mm, 3.2 mm, or 3.5 mm, and there is no limitation here.

[0055] It should be noted that, with the above-mentioned cutting allowance, the broach can remove the uneven surface left by milling, so that the inner wall of the hinge hole 110 can obtain a lower roughness. Moreover, the moderate cutting allowance will not increase the broaching load, effectively extending the tool life and improving the machining accuracy.

[0056] In one specific embodiment, the diameter of the initial hole 220 is larger than the width of the straight groove 230; the width of the straight groove 230 is 2.4 mm to 4.8 mm, which is not limited here. Specifically, the diameter of the initial hole 220 is 0.05 mm to 0.2 mm larger than the width of the straight groove 230. For example, the width of the straight groove 230 is 2.7 mm, 2.9 mm, or 3.1 mm, which is not limited here.

[0057] It should be noted that the straight groove 230 forms a constricted structure compared to the initial hole 220, providing a positioning basis for the subsequent forming of the snap-fit ​​position 120; at the same time, it avoids the side wall of the straight groove 230 from chipping or deforming due to excessive force when drawing the hinge hole 110.

[0058] In one specific embodiment, the distance from the center of the initial hole 220 to the center of the piston body 200 is L1, and the distance from the center of the hinge hole 110 to the center of the piston body 200 is L2; ​​wherein, L1 < L2.

[0059] It should be noted that the amount of broaching required to move the initial hole 220 inward, i.e., the amount of broaching on the side of the initial hole 220 closer to the center of the piston body 200, is less than the amount of broaching required on the side of the initial hole 220 farther from the center of the piston body 200. Therefore, when broaching the initial hole 220, the cutting force mainly acts on the side of the initial hole 220 farther from the piston center, reducing the impact on the central area of ​​the piston body 200 and ensuring the symmetry and strength of the overall structure of the compressor piston 100.

[0060] For example, the outer diameter of the compressor piston 100 is 30 to 40 mm, and the inner diameter of the compressor piston 100 is 18 to 24 mm. The distance L1 from the center of the initial hole 220 to the center of the piston body 200 ranges from 15.5 to 16 mm, and the distance L2 from the center of the hinge hole 110 to the center of the piston body 200 ranges from 15.6 to 16.1 mm.

[0061] In one specific embodiment, the distance from the end of the initial hole 220 near the center of the piston body 200 to the center of the piston body 200 is L3, and the distance from the end of the hinge hole 110 near the center of the piston body 200 to the center of the piston body 200 is L4; wherein, 0 < L3 - L4 ≤ 0.2 mm.

[0062] It should be noted that the broaching amount at the end of the initial hole 220 near the center of the piston body 200 is within the range of 0.2mm, which reduces the wear of the broach teeth and the deformation of the hinge hole 110, and improves the broaching accuracy at the end of the initial hole 220 near the center of the piston body 200.

[0063] For example, the distance L3 from the end of the initial hole 220 near the center of the piston body 200 to the center of the piston body 200 ranges from 14.1 to 14.6 mm; the distance L4 from the end of the hinge hole 110 near the center of the piston body 200 to the center of the piston body 200 ranges from 14 to 14.5 mm.

[0064] Preferably, L3-L4=0.1mm.

[0065] In one specific embodiment, the number of broach teeth can be 10 to 30, for example, 12 or 18, and is not limited here.

[0066] Specifically, the broach teeth include 4 to 6 coarse cutting teeth, 2 to 3 transition teeth, 2 to 3 fine cutting teeth, and 3 to 6 calibration teeth. The coarse cutting teeth, transition teeth, fine cutting teeth, and calibration teeth sequentially process the initial hole 220, quickly completing the roughing, finishing, and calibration.

[0067] Furthermore, the initial hole 220 broaching is performed using either form broaching, progressive broaching, or a combination of form broaching and progressive broaching.

[0068] For example, the initial hole 220 is formed by broaching. In this case, at least some of the broach teeth have rounded ends. The broach teeth with rounded ends are arranged in ascending order of size according to the rounded ends, which is used to gradually enlarge the initial hole 220 to the hinge hole 110. The center of the rounded ends gradually shifts from the center of the initial hole 220 to the center of the hinge hole 110, thereby concentrating the broached portion mainly on the side of the initial hole 220 away from the piston center, reducing the deformation of the piston inner wall.

[0069] For example, the initial hole 220 can also be broached using progressive broaching, with the broach teeth extending sequentially. The center of the initial hole 220 is offset towards the center of the compressor piston 100 compared to the center of the hinged hole 110. This means the amount to be removed from the side of the initial hole 220 closer to the center of the compressor piston 100 is smaller. In progressive broaching, only a few of the later, longer broach teeth are used to cut the side of the initial hole 220 closer to the center of the compressor piston 100, thus reducing the amount to be removed and effectively protecting the ends of the broach teeth. The side of the initial hole 220 furthest from the center of the compressor piston 100 can be broached by most of the broach teeth, thus improving the dimensional accuracy of the side of the initial hole 220 furthest from the center of the compressor piston 100.

[0070] In one specific embodiment, a broach is used to enlarge the end of the initial groove 210 away from the outer wall to form a hinge hole 110. At the same time, the manufacturing method also includes: using a broach to enlarge the straight groove 230 to form a snap-fit ​​position 120.

[0071] Preferably, based on the width of the straight groove 230 being 2.4mm to 3mm, the width of the snap-fit ​​position 120 is 2.5mm to 3.1mm, for example, the width of the snap-fit ​​position 120 is 2.8mm.

[0072] It should be noted that using the same broach in a single broaching stroke simultaneously completes the enlarging of the hinge hole 110 and the sidewall trimming of the straight groove 230, effectively improving machining efficiency. This further improves the dimensional accuracy and surface quality of the snap-fit ​​position 120. The opening dimensional accuracy of the snap-fit ​​position 120 is beneficial for the assembly of the compressor vanes, and the symmetry of the snap-fit ​​position 120 ensures the consistency of the vane's swing on both sides during the hinge process.

[0073] For example, the straight groove 230 can be formed by broaching together with the initial hole 220. In this case, the main body of the broach teeth is straight, and the broach teeth are arranged in ascending order of width according to the main body, thereby gradually expanding the straight groove 230 to the width of the snap-fit ​​position 120. This allows for rapid forming of the hinge hole 110 and the snap-fit ​​position 120, while reducing the number of broach teeth and saving costs.

[0074] For example, the straight groove 230 can be broached together with the initial hole 220 using a progressive broaching technique. The length of the broach teeth increases sequentially, first gradually broaching the straight groove 230 structure. When the length of the broach teeth increases to the position of the initial hole 220, the initial hole 220 is gradually broached until the hinge hole 110 is completely broached. This progressive broaching technique facilitates the removal of cutting waste from the straight groove 230 structure and the initial hole 220, and the cutting on both sides of the straight groove 230 structure is more uniform.

[0075] For example, after the straight groove 230 is broached progressively, the initial hole 220 can be broached in a progressive manner. That is, the length of the broach teeth increases sequentially within the range of the straight groove 230. When the length of the broach teeth increases to the position of the initial hole 220, multiple broach teeth with circular ends of increasing size are used to machine the initial hole 220. On the one hand, the cutting waste of the straight groove 230 structure is better discharged; on the other hand, it is easier to ensure cylindricity after the initial hole 220 is enlarged into the hinged hole 110.

[0076] In one specific embodiment, a hinge hole 110 is formed, and the manufacturing method further includes chamfering one end of the straight groove 230 that connects to the outer wall.

[0077] It should be noted that when the compressor vane hinges and swings relative to the compressor piston 100, the chamfer is used to avoid the side wall of the compressor vane and limit the swing range of the compressor vane, so that the compressor vane can rotate stably. Performing the chamfering after the broaching hole is enlarged can prevent the chamfer from deforming into the outer shape and reducing accuracy when the broaching tool squeezes the initial groove 210 and the straight groove 230.

[0078] Preferably, the included angle between the chamfered surfaces on both sides of the straight groove 230 is in the range of 90° to 135°, for example, 110°, 115°, 120°.

[0079] In one specific embodiment, the end of the straight groove 230 connected to the outer wall is chamfered, specifically by using a milling, grinding or chamfering machine to process the chamfer at the end of the straight groove 230 connected to the outer wall.

[0080] In one specific embodiment, the preparation of the piston body 200 includes: blanking and turning raw materials to prepare a semi-finished product; rough grinding the end face, outer wall and inner wall of the semi-finished product; and fine grinding the end face, outer wall and inner wall of the semi-finished product to obtain the piston body 200.

[0081] Among them, the end faces of the semi-finished product are the two ends of the semi-finished product's axial direction; the outer wall of the semi-finished product is used to process the outer wall of the compressor piston 100, and the outer wall of the compressor piston 100 is used to roll on the inner wall of the compressor cylinder; the inner wall of the semi-finished product is used to process the inner wall of the compressor piston 100, and the inner wall of the compressor piston 100 is used to install the crankshaft.

[0082] It should be noted that after the raw material is cut, it can be turned to obtain a semi-finished product with basic dimensions; rough grinding can remove the burrs generated during the cutting and turning process, so that the end face, outer wall and inner wall of the semi-finished product can be used as a reference for further processing; fine grinding of the end face, outer wall and inner wall can improve the accuracy of the reference; ensure the perpendicularity of the end face and the outer wall to avoid the piston body 200 being tilted when placed in the broaching tool, which would cause the hinge hole 110 to tilt; ensure the cylindricity of the outer wall to avoid the positional displacement of the hinge hole 110.

[0083] Preferably, the raw materials are, for example, GCr15, 40Cr, 20Cr, or 20CrMnTi. The raw materials are formed into a ring structure by cutting pipes or cold heading coils, and the ring structure is then machined to obtain a semi-finished product.

[0084] Preferably, the inner wall of the semi-finished product can also be honed to improve the precision of the inner wall of the piston body 200 and reduce the coefficient of friction with the compressor crankshaft.

[0085] Furthermore, the end face, outer wall and inner wall of the semi-finished product are rough ground using a grinding wheel, and then the end face, outer wall and inner wall of the semi-finished product are fine ground using a grinding wheel to obtain the piston body 200, so that the surface roughness Ra of the piston body 200 is ≤1.6μm.

[0086] In one specific embodiment, the piston body 200 is surface treated to obtain the compressor piston 100, specifically including: fine grinding and honing of the inner wall of the hinge hole 110.

[0087] It should be noted that the inner wall of the hinge hole 110 can be significantly improved in terms of dimensional accuracy and wear resistance by fine grinding: honing improves accuracy while forming a uniform micro-texture, enhancing the lubricant adsorption capacity and reducing the coefficient of friction with the compressor vane.

[0088] Preferably, the inner wall of the hinge hole 110 is finely ground with a grinding wheel and then honed with a honing rod.

[0089] In one specific embodiment, the manufacturing method further includes deburring, cleaning, and rust prevention treatment. For example, the piston body 200 is deburred using a brush or magnetic polishing. Specifically, this removes burrs generated by broaching and fine grinding at both ends of the hinge hole 110, as well as burrs on the snap-fit ​​position 120 and the chamfered edges. The cleaning process of the piston body 200 uses ultrasonic cleaning to remove debris generated by fine grinding and deburring. The rust prevention process of the piston body 200 uses water-based rust-preventive oil immersion, which is not limited here.

[0090] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for manufacturing a compressor piston, the compressor piston comprising a hinge hole and a snap-fit ​​position with a width smaller than the hinge hole, the hinge hole being used to connect a transmission component to achieve eccentric rotation of the compressor piston and crankshaft, thereby achieving air compression, characterized in that... The manufacturing method includes: Preparation of piston body; The piston body is milled to form an initial groove on the outer wall of the piston body; the initial groove extends through both ends of the piston body. The initial groove is enlarged at the end furthest from the outer wall using a broach to form the hinge hole; the diameter of the hinge hole is larger than the width of the initial groove. The piston body is surface treated to obtain a compressor piston; The initial groove is a U-shaped groove, and the initial groove includes: a straight groove communicating with the outer wall, and an initial hole located at the end of the straight groove away from the outer wall; the diameter of the initial hole is greater than the width of the straight groove; The milling process of the piston body to form an initial groove on the outer wall of the piston body specifically includes: milling the piston body to form the straight groove and the initial hole; The method involves using a broach to enlarge the end of the initial groove away from the outer wall to form the hinge hole. The manufacturing method also includes: The straight groove is enlarged using a broach to form a snap-fit ​​position; the same broach is used to simultaneously enlarge the hinge hole and trim the sidewall of the straight groove in one broaching stroke. The distance from the center of the initial hole to the center of the piston body is L1, and the distance from the center of the hinge hole to the center of the piston body is L2; Where L1 < L2; The distance from the end of the initial hole near the center of the piston body to the center of the piston body is L3, and the distance from the end of the hinge hole near the center of the piston body to the center of the piston body is L4; Where 0 < L3 - L4 ≤ 0.2 mm.

2. The manufacturing method according to claim 1, characterized in that, The step of enlarging the end of the initial groove away from the outer wall using a broach to form the hinge hole specifically includes: The initial hole is enlarged using a broach to form a hinged hole; The diameter of the initial hole is 2.5 mm to 4.8 mm; the diameter of the hinge hole is 2.8 mm to 5.0 mm.

3. The manufacturing method according to claim 2, characterized in that, The width of the straight groove is 2.4 mm to 4.8 mm.

4. The manufacturing method according to claim 1, characterized in that, After forming the hinge hole, the manufacturing method further includes chamfering one end of the straight groove that connects to the outer wall.

5. The manufacturing method according to claim 1, characterized in that, The preparation of the piston body specifically includes: Raw materials are cut and machined to prepare semi-finished products; The end face, outer wall, and inner wall of the semi-finished product are rough ground; The piston body is obtained by precision grinding the end face, outer wall, and inner wall of the semi-finished product.

6. The manufacturing method according to claim 1, characterized in that, The process of surface treating the piston body to obtain the compressor piston specifically includes: The inner wall of the hinge hole is precision ground and honed.

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