A guide pillar anti-deviation wear structure of a household appliance accessory stamping die
Patent Information
- Application Number
- CN202522614121.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-12-10
AI Technical Summary
[0003]有鉴于此，本实用新型提供了一种家电配件冲压模具导柱防偏磨结构，能够解决冲压模具导柱在侧向力作用下产生偏磨导致导向精度下降的技术问题
[0009]采用上述改进方案的有益效果为：通过限定防偏磨套筒的轴向长度大于导柱本体直径的3倍，使得防偏磨套筒对导柱本体形成较大的支撑范围，增加了导柱本体与防偏磨套筒之间的接触长度，能够更有效地分散导柱在运动过程中承受的侧向力，减小单位面积上的压强，降低局部磨损的风险，进一步提升防偏磨效果，保证导柱在长期使用中的运动精度。
Smart Images
Figure CN224913397U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of stamping technology for home appliance parts, and specifically relates to an anti-wear structure for guide pillars of stamping dies for home appliance parts. Background Technology
[0002] In existing technologies, the stamping process of home appliance parts relies on high-precision stamping dies to ensure product quality. The guide pillars of the stamping dies, as key guiding components, play a crucial role in ensuring precise alignment of the upper and lower dies. During operation, the guide pillars undergo high-frequency reciprocating motion while simultaneously withstanding lateral impact and frictional forces. Currently, most stamping die guide pillars are made of cylindrical steel with chrome plating or quenching treatment. They achieve their guiding function by sliding directly within the guide sleeve, with a lubricating oil film between the guide pillar and the guide sleeve reducing friction and wear. However, in actual production applications, due to factors such as the inhomogeneity of workpiece material, die assembly errors, and uneven distribution of stamping force during the stamping process, the guide pillars are subjected to uneven lateral forces during reciprocating motion. These lateral forces cause the guide pillars to deviate within the guide sleeve, resulting in uneven contact pressure distribution between the guide pillar and the guide sleeve. Excessive pressure in localized areas accelerates wear. While traditional surface treatment methods can improve the surface hardness of guide pillars, their effectiveness in improving the problem of uneven wear caused by lateral forces is limited. The lubricating oil film is prone to rupture under high-speed reciprocating motion and lateral forces, leading to severe wear due to direct contact between the metal surfaces. This results in localized depressions and grooves on the guide pillars, gradually reducing the guiding accuracy of the die and ultimately affecting the dimensional accuracy and surface quality of the stamped parts. In other words, existing technology suffers from the technical problem of uneven wear on stamping die guide pillars under lateral forces, leading to a decrease in guiding accuracy. Utility Model Content
[0003] In view of this, the present invention provides an anti-wear structure for the guide post of a stamping die for household appliance parts, which can solve the technical problem of reduced guiding accuracy caused by uneven wear of the guide post of the stamping die under lateral force.
[0004] This utility model is implemented as follows:
[0005] This utility model provides an anti-wear structure for a guide post of a stamping die for household appliance parts, comprising a guide post body, an anti-wear sleeve, a lubrication groove structure, and a locking ring. The guide post body is a cylindrical rod-shaped structure. The anti-wear sleeve is sleeved on the outer circumferential surface of the guide post body, and a fitting clearance is formed between the inner circumferential surface of the anti-wear sleeve and the outer circumferential surface of the guide post body. The lubrication groove structure is formed on the inner circumferential surface of the anti-wear sleeve and extends along the axial direction of the guide post body. The locking ring is disposed at the end of the anti-wear sleeve and is fixed to the end of the guide post body by a threaded connection.
[0006] The technical effects of the anti-wear structure for the guide post of a stamping die for household appliance parts provided by this utility model are as follows: By sleeved with an anti-wear sleeve on the outer circumferential surface of the guide post body and opening a lubrication groove structure on the inner circumferential surface of the anti-wear sleeve, a lubrication-functional fitting gap is formed between the guide post body and the anti-wear sleeve. At the same time, the anti-wear sleeve is fixed to the end of the guide post body by a locking ring, ensuring that the anti-wear sleeve and the guide post body maintain a stable relative position relationship. This effectively reduces the wear phenomenon caused by lateral force during the reciprocating motion of the guide post, extends the service life of the guide post, and improves the processing accuracy and stability of the stamping die.
[0007] Based on the above technical solution, the anti-wear structure of the guide post of the stamping die for household appliance parts of this utility model can be further improved as follows:
[0008] The axial length of the anti-wear sleeve is greater than three times the diameter of the guide post body.
[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by limiting the axial length of the anti-wear sleeve to be more than three times the diameter of the guide post body, the anti-wear sleeve forms a larger support range for the guide post body, increasing the contact length between the guide post body and the anti-wear sleeve, which can more effectively disperse the lateral force borne by the guide post during movement, reduce the pressure per unit area, reduce the risk of local wear, further improve the anti-wear effect, and ensure the movement accuracy of the guide post in long-term use.
[0010] Furthermore, the lubrication groove structure is spirally distributed on the inner circumferential surface of the anti-wear sleeve, and the spiral angle of the lubrication groove structure is acutely related to the axis of the guide post body.
[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by designing the lubrication groove structure as a spiral distribution on the inner circumferential surface of the anti-wear sleeve, and making the spiral angle acutely related to the axis of the guide post body, the lubricating medium can form a continuous flow path along the spiral groove structure when the guide post reciprocates, which promotes the uniform distribution of the lubricating medium in the entire mating gap, avoids the accumulation or loss of the lubricating medium in local areas, improves the durability and stability of the lubrication effect, and reduces frictional resistance and wear.
[0012] Furthermore, the cross-section of the lubrication groove structure is a V-shaped or U-shaped groove.
[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting the cross-section of the lubrication groove structure to be V-shaped or U-shaped, the lubrication groove structure has a good capacity to accommodate the lubricating medium. The V-shaped or U-shaped groove structure can generate a certain guiding effect when the guide post moves, guiding the lubricating medium to flow in the groove and gradually diffuse to the mating surface. At the same time, the shape design of the groove is conducive to the storage and replenishment of the lubricating medium, ensuring that the guide post body and the anti-wear sleeve always maintain a sufficient lubrication state and reducing the coefficient of friction.
[0014] Furthermore, the outer circumferential surface of the anti-wear sleeve is provided with annular reinforcing ribs, which are evenly distributed along the axial direction of the anti-wear sleeve.
[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting annular reinforcing ribs on the outer circumferential surface of the anti-wear sleeve and distributing them at equal intervals along the axial direction, the overall structural strength and rigidity of the anti-wear sleeve are enhanced, making the anti-wear sleeve less prone to deformation when subjected to radial and axial forces transmitted by the guide post. This maintains the uniformity of the fit clearance between the inner circumferential surface of the anti-wear sleeve and the outer circumferential surface of the guide post body, avoids local contact and uneven wear caused by sleeve deformation, and improves the service life and reliability of the anti-wear sleeve.
[0016] Furthermore, the inner circumferential surface of the locking ring is provided with a serrated snap-fit structure, which forms an interference fit with the outer circumferential surface of the end of the guide post body.
[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting a sawtooth-shaped snap-fit structure on the inner circumferential surface of the locking ring and forming an interference fit with the outer circumferential surface of the guide post body, a reliable frictional force and mechanical biting force are generated between the locking ring and the guide post body, preventing the locking ring from loosening or falling off during the high-frequency reciprocating motion of the guide post, ensuring that the anti-wear sleeve is always firmly fixed on the guide post body, maintaining the stability of the anti-wear structure, and avoiding displacement and functional loss of the anti-wear sleeve due to the failure of the locking ring.
[0018] Furthermore, the end face of the anti-wear sleeve is provided with a circular boss, the geometric center of which is coaxial with the axis of the guide post body, and the locking ring is pressed against the outer end face of the circular boss.
[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting a circular boss on the end face of the anti-wear sleeve and making its geometric center coaxial with the axis of the guide post body, and at the same time pressing the locking ring against the outer end face of the circular boss, the locking force of the locking ring can be evenly transmitted to the end face of the anti-wear sleeve, avoiding deformation of the end of the anti-wear sleeve caused by uneven distribution of locking force, ensuring the coaxiality between the anti-wear sleeve and the guide post body, maintaining the consistency of the fitting clearance, improving the smoothness of the guide post movement and the overall performance of the anti-wear structure.
[0020] Furthermore, the anti-wear sleeve is made of wear-resistant alloy material.
[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by using wear-resistant alloy materials to manufacture the anti-wear sleeve, the anti-wear sleeve has excellent wear resistance and fatigue resistance. It can maintain the smoothness and dimensional accuracy of the inner circumference surface under the working conditions of long-term high-frequency reciprocating motion of the guide post and bearing large lateral forces, reduce the wear rate of the anti-wear sleeve itself, extend the overall service life of the anti-wear structure, reduce the mold maintenance frequency and replacement cost, and improve production efficiency.
[0022] Furthermore, the groove depth of the lubrication groove structure is 1 / 4 to 1 / 3 of the wall thickness of the anti-wear sleeve.
[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by limiting the groove depth of the lubrication groove structure to 1 / 4 to 1 / 3 of the wall thickness of the anti-wear sleeve, it ensures that the lubrication groove structure has sufficient volume to store the lubricating medium, while avoiding weakening the structural strength of the anti-wear sleeve due to excessive groove depth. This allows the lubrication groove structure to provide good lubrication effect without affecting the load-bearing capacity of the anti-wear sleeve, achieving a balance between lubrication performance and structural strength, and ensuring the stable operation of the anti-wear structure under various working conditions.
[0024] Furthermore, the mating gap between the anti-wear sleeve and the guide post body is filled with solid lubricating material, which is evenly distributed within the lubrication groove structure.
[0025] The beneficial effects of the above-mentioned improvement scheme are as follows: by filling the gap between the anti-wear sleeve and the guide post body with solid lubricating material and distributing it evenly in the lubrication groove structure, the guide post can continuously obtain the lubrication effect provided by the solid lubricating material during the movement. The solid lubricating material is gradually released during the friction process and forms a lubricating film on the contact surface, which effectively reduces the coefficient of friction and the wear rate. At the same time, the solid lubricating material filled in the lubrication groove structure is not easy to be lost, ensuring a long-term stable lubrication effect and adapting to the working characteristics of high-frequency reciprocating motion of stamping dies.
[0026] Compared with the prior art, the beneficial effects of the anti-wear structure for the guide post of the stamping die for household appliance parts provided by this utility model are as follows: By fitting an anti-wear sleeve on the outer circumferential surface of the guide post body and opening an axially extending lubrication groove structure on the inner circumferential surface of the anti-wear sleeve, a fitting gap with the function of storing and distributing lubricating medium is formed between the guide post body and the anti-wear sleeve. The anti-wear sleeve is made of wear-resistant alloy material with high wear resistance, which can withstand the lateral force transmitted by the guide post and disperse it to a larger contact area, reducing the contact pressure per unit area. The lubrication groove structure adopts a spiral distribution design, which promotes the continuous flow and uniform distribution of lubricating medium in the entire fitting gap when the guide post reciprocates, maintaining a stable lubricating film thickness. At the same time, the anti-wear sleeve is firmly fixed to the end of the guide post body by a locking ring to prevent the anti-wear sleeve from shifting or loosening during operation and maintain the stability of the anti-wear structure. The axial length of the anti-wear sleeve is designed to be more than three times the diameter of the guide post body, increasing the effective support length of the guide post. When the guide post is subjected to lateral force, the longer support length can provide greater bending stiffness, reduce the deflection deformation of the guide post, and enable the guide post to maintain a better linear motion state within the sleeve. The annular reinforcing rib further enhances the structural rigidity of the anti-wear sleeve, preventing deformation of the sleeve under load that could lead to uneven fit clearance. The serrated locking structure of the locking ring forms a reliable mechanical connection with the guide post body, ensuring that the anti-wear sleeve always maintains the correct installation position during high-frequency reciprocating motion. Solid lubricating material filled in the lubrication groove structure provides a long-lasting and stable lubrication effect. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 A cross-sectional view of a guide post anti-wear structure for a stamping die of a household appliance component;
[0029] Figure 2 A front view of a guide post anti-wear structure for a stamping die of a household appliance component;
[0030] Figure 3 A partial cross-sectional view of the guide post body of a guide post anti-wear structure for a stamping die of a household appliance component.
[0031] The attached diagram lists the components represented by each number as follows:
[0032] 01. Guide post body; 02. Anti-wear sleeve; 03. Lubrication groove structure; 04. Locking ring; 041. Serrated snap-fit structure; 05. Annular reinforcing rib; 06. Circular boss; 07. Fitting clearance. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0034] like Figure 1-3The image shows an embodiment of an anti-wear structure for a stamping die guide post of a household appliance component provided by this utility model. It includes a guide post body 01, an anti-wear sleeve 02, a lubrication groove structure 03, and a locking ring 04. The guide post body 01 is a cylindrical rod-shaped structure made of 45# high-quality carbon structural steel and subjected to tempering heat treatment, achieving a surface hardness of HRC45~HRC50. The diameter of the guide post body 01 is determined according to the specifications of the stamping die. The anti-wear sleeve 02 is fitted onto the outer circumferential surface of the guide post body 01 and is made of a copper-based wear-resistant alloy material. (Specific material brand...) The material, designated ZCuSn10Pb1 or ZCuAl10Fe3, possesses excellent wear resistance and friction reduction properties. A fitting clearance 07 is formed between the inner circumferential surface of the anti-wear sleeve 02 and the outer circumferential surface of the guide post body 01. The radial dimension of the fitting clearance 07 is controlled between 0.02mm and 0.05mm, ensuring smooth sliding of the guide post body 01 within the anti-wear sleeve 02 while preventing excessive clearance from reducing guiding accuracy. A lubrication groove structure 03 is formed on the inner circumferential surface of the anti-wear sleeve 02, extending axially along the guide post body 01 and forming a spiral shape. The lubrication grooves are arranged in a spiral pattern with a helical angle of 15 to 25 degrees. The helical direction matches the reciprocating motion direction of the guide post body 01 to generate a pumping effect. There are 4 to 8 lubrication groove structures 03, evenly distributed on the inner circumferential surface of the anti-wear sleeve 02. The cross-section of the lubrication groove structure 03 is a V-shaped groove with a groove depth of 1.5 mm to 2.5 mm, a groove width of 2 mm to 3 mm, and a groove bottom angle of 60 to 90 degrees. The groove depth of the lubrication groove structure 03 is designed to be 1 / 4 to 1 / 3 of the wall thickness of the anti-wear sleeve 02, which has a wall thickness of 6 mm to 9 mm. A locking ring is also included. 04 is located at the end of the anti-wear sleeve 02. The locking ring 04 is fixed to the end of the guide post body 01 by an M8~M12 threaded connection. The material of the locking ring 04 is 40Cr alloy structural steel that has been quenched and tempered. The inner circumferential surface of the locking ring 04 is provided with a serrated snap-fit structure 041. The tooth height of the serrated snap-fit structure 041 is 0.3mm~0.5mm, the tooth pitch is 1mm~1.5mm, and the tooth angle is 30 degrees~45 degrees. The serrated snap-fit structure 041 forms an interference fit with the outer circumferential surface of the end of the guide post body 01, and the interference amount is 0.01mm~0.The 041, with a serrated snap-fit structure of 03mm, undergoes plastic deformation during assembly by being pressed into the end of the guide post body 01, forming a stable mechanical engagement. The outer circumferential surface of the anti-wear sleeve 02 is provided with annular reinforcing ribs 05. These ribs are evenly distributed along the axial direction of the anti-wear sleeve 02, with a spacing of 20mm~30mm. The radial height of the annular reinforcing ribs 05 is 2mm~3mm, and the axial width is 3mm~5mm. The annular reinforcing ribs 05 enhance anti-wear protection. The sleeve 02 has a moment of inertia that improves its bending stiffness. A circular boss 06 is provided on the end face of the anti-wear sleeve 02. The geometric center of the circular boss 06 is coaxial with the axis of the guide post body 01. The outer diameter of the circular boss 06 is 2mm~4mm smaller than the outer diameter of the anti-wear sleeve 02, and the height of the boss is 1mm~2mm. The locking ring 04 is pressed against the outer end face of the circular boss 06. The circular boss 06 provides a positioning reference for the locking ring 04, ensuring uniform distribution of locking force and smooth mating. The gap 07 is filled with a solid lubricant, a mixture of molybdenum disulfide and graphite, in a ratio of 60%–70% molybdenum disulfide and 30%–40% graphite. The solid lubricant is evenly distributed within the lubrication groove structure 03, achieving a filling rate of 80%–90% of its volume. During relative movement between the guide post body 01 and the anti-wear sleeve 02, the solid lubricant is gradually released and forms a solid lubricating film on the contact surface, reducing the coefficient of friction by 0.08–0.12. The axial length of the anti-wear sleeve 02 is 3–4 times the diameter of the guide post body 01. This length ratio ensures that the anti-wear sleeve 02 provides sufficient support for the guide post body 01. When the guide post body 01 is subjected to lateral forces, the longer support length disperses the lateral forces over a wider range. According to the deflection calculation formula for cantilever beams in mechanics of materials, increasing the support length by 3 times can reduce the deflection by 1 / 9 of its original value, significantly improving the movement accuracy of the guide post body 01.
[0035] The operation method of this utility model is as follows: First, clean the inner circumferential surface of the anti-wear sleeve 02 and fill the lubrication groove structure 03 with solid lubricating material. Then, insert the anti-wear sleeve 02 into one end of the guide post body 01, so that the inner circumferential surface of the anti-wear sleeve 02 and the outer circumferential surface of the guide post body 01 form a fitting clearance 07. Adjust the axial position of the anti-wear sleeve 02 to cover the working stroke range of the guide post body 01. Next, inject lubricating oil into the fitting clearance 07 as a liquid lubricating medium. The lubricating oil adopts ISO Apply VG32 or VG46 anti-wear hydraulic oil, filling it to 50%~60% of the volume of the fitting clearance 07. Then, insert the locking ring 04 onto the end of the guide post body 01, aligning the serrated engagement structure 041 on the inner circumference of the locking ring 04 with the outer circumference of the end of the guide post body 01. Use a special pressing tool to press the locking ring 04 into the end of the guide post body 01, controlling the pressing force to 5kN~8kN, so that the serrated engagement structure 041 and the guide post body 01 form an interference fit. Simultaneously, the locking ring 04 presses against the circular boss 06 on the end face of the anti-wear sleeve 02. Finally, tighten the threaded connection of the locking ring 04 with a wrench, with a tightening torque of 30Nm~40Nm, completing the assembly of the anti-wear structure. After completion, check whether the anti-wear sleeve 02 can remain coaxial with the guide post body 01. Manually push and pull the guide post body 01 to check its smooth sliding within the anti-wear sleeve 02. After confirming that there is no jamming, the assembled guide post can be installed into the stamping die for use. During use, the lubricating oil condition in the mating clearance 07 needs to be checked every 500 to 1000 hours. If the lubricating oil is found to be deteriorated or reduced, it needs to be replenished or replaced in time. Every 2000 to 3000 hours of operation, the wear condition of the anti-wear sleeve 02 and the guide post body 01 needs to be disassembled and checked. If the wear depth of the inner circumferential surface of the anti-wear sleeve 02 exceeds 0.1 mm or obvious grooves appear on the surface of the guide post body 01, the corresponding parts need to be replaced.
[0036] In Example 1, this utility model is applied to the anti-wear modification of the guide post of a stamping die for a household air conditioner housing. This stamping die is used to stamp galvanized steel sheets with a thickness of 0.8mm to produce the side panels of the air conditioner housing. The guide post diameter is 40mm, the stroke is 150mm, and the stamping frequency is 60 times per minute. The original guide post was made of 45# steel with a chrome-plated surface and slid directly within a copper sleeve. After approximately 300,000 stamping cycles, obvious wear grooves appeared on the guide post surface, with a depth of 0.3mm~0.5mm, leading to an increase in the alignment error of the upper and lower dies by ~0.2mm and a decrease in the dimensional accuracy of the stamped parts. This utility model's anti-wear structure was used for modification. The guide post body 01 uses the original 40mm diameter guide post, which is then re-ground to restore cylindricity. The anti-wear sleeve 02 is made of ZCuSn10Pb1 copper alloy material, with an inner diameter of 40.04mm, an outer diameter of 54mm, an axial length of 140mm, and a wall thickness of 7mm. Six spiral lubrication grooves 03 are machined on the inner circumferential surface of the anti-wear sleeve 02. The spiral angle is 20 degrees, the cross-section of the lubrication groove structure 03 is V-shaped, the groove depth is 2mm, the groove width is 2.5mm, and the groove bottom angle is 75 degrees. Four annular reinforcing ribs 05 are machined axially on the outer circumferential surface of the anti-wear sleeve 02. The spacing between the ribs is 28mm, the height of the reinforcing ribs is 2.5mm, and the width is 4mm. A circular boss 06 with an outer diameter of 50mm is machined on the end face of the anti-wear sleeve 02. The locking ring 04, with a height of 1.5mm, is made of 40Cr steel, with an inner diameter of 40mm, an outer diameter of 60mm, and a thickness of 12mm. A serrated snap-fit structure 041 is machined on the inner circumference of the locking ring 04, with a tooth height of 0.4mm, a tooth pitch of 1.2mm, and a tooth angle of 40 degrees. The lubrication groove structure 03 of the anti-wear sleeve 02 is filled with a solid lubricating material consisting of a 7:3 mass ratio of molybdenum disulfide and graphite, with a filling rate of 85%. ISO is injected into the mating clearance 07. VG32 anti-wear hydraulic oil, approximately 12ml. After assembly, the modified guide post was reinstalled into the stamping die, and the die was put back into production. It worked continuously under the same stamping process conditions. After the cumulative number of stamping cycles reached 1 million, the guide post was inspected. It was found that the inner circumferential surface of the anti-wear sleeve 02 had only slight wear marks, with a wear depth of less than 0.05mm. The surface of the guide post body 01 remained smooth, without any wear grooves. The alignment accuracy of the die remained at 0.Within 0.5mm, the dimensional accuracy of the stamped parts meets design requirements. The service life of the anti-wear structure is extended by more than 3 times compared to the original guide post. The working principle is that the long support structure of the anti-wear sleeve 02 ensures that the guide post body 01 maintains good linear motion when subjected to lateral impact force. The lateral force is dispersed across the entire inner circumference surface of the anti-wear sleeve 02, reducing the pressure per unit area by about 1 / 3. The spiral lubrication groove structure 03 creates a dynamic pressure lubrication effect during the high-frequency reciprocating motion of the guide post. Lubricating oil is pumped and circulated within the spiral groove, maintaining the oil film thickness on the mating surfaces. Solid lubricating material provides boundary lubrication protection when the liquid lubricating film partially ruptures. The double locking mechanism of the locking ring 04 ensures stable installation of the anti-wear sleeve 02 in a high-frequency vibration environment. The annular reinforcing rib 05 enhances the deformation resistance of the anti-wear sleeve 02 and maintains the uniformity of the mating clearance 07.
[0037] In Example 2, the lubrication groove structure 03 is improved based on Example 1. The cross-sectional shape of the lubrication groove structure 03 is changed from V-shaped to U-shaped, with a rounded bottom and a radius of 1mm. The groove depth remains at 2mm, while the groove width is increased to 3mm. Compared to the V-shaped cross-section, the U-shaped cross-section has a larger volume, increasing the oil storage capacity by approximately 25%. Simultaneously, the rounded bottom reduces stress concentration, lowering the risk of bottom cracking in the lubrication groove structure 03. The improved lubrication groove structure 03 can store more lubricating oil during the reciprocating motion of the guide post. When the guide post moves at a higher speed, the lubricating oil consumption rate increases, and the larger oil storage volume further enhances its performance. To ensure a continuous supply of lubricating oil, 5% polytetrafluoroethylene (PTFE) powder was added to the solid lubricant formula, and the mixing ratio was adjusted to 60% molybdenum disulfide, 35% graphite, and 5% PTFE. PTFE has an extremely low coefficient of friction and good anti-adhesion properties, forming a synergistic lubrication effect with molybdenum disulfide and graphite, further reducing frictional resistance. After the improved anti-wear structure was inspected after 1.5 million continuous cycles under the same working conditions, the wear depth of the anti-wear sleeve 02 was less than 0.03mm, no wear marks were found on the surface of the guide post body 01, and the coefficient of friction was reduced to 0.06~0.09, making the mold operation more stable and smooth.
[0038] In Example 3, the structure of the annular reinforcing rib 05 is optimized based on Example 1. The cross-sectional shape of the annular reinforcing rib 05 is changed from rectangular to trapezoidal. The upper base width of the trapezoid is 3mm, the lower base width is 5mm, and the height remains at 2.5mm. The trapezoidal cross-section of the annular reinforcing rib 05 provides the same bending stiffness while reducing the weight of the anti-wear sleeve 02, reducing the moment of inertia of the guide post, and reducing the impact load during starting and braking. At the same time, the transition angle of the trapezoidal structure makes the outer circumferential surface of the anti-wear sleeve 02 smoother, avoiding stress concentration caused by right-angle transitions, and improving the fatigue strength of the anti-wear sleeve 02. In addition, in the lock... A spring washer is added between the locking ring 04 and the circular boss 06. The spring washer is made of 65Mn spring steel with a thickness of 1.5mm. The spring washer generates a preload after the locking ring 04 is tightened. Even under long-term vibration conditions, the threaded connection of the locking ring 04 will not loosen. The elastic deformation of the spring washer absorbs part of the impact energy, reducing the transmission of impact load to the anti-wear sleeve 02 and the guide post body 01. The improved anti-wear structure exhibits better stability and reliability under high impact load stamping conditions. No fatigue cracks appeared in the anti-wear sleeve 02, and the locking ring 04 did not loosen. The service life of the overall structure is further extended.
[0039] Specifically, the principle of this invention is to improve the stress state and lubrication conditions of the guide post through a combination of structural design and material selection, thereby fundamentally reducing the occurrence of uneven wear. When the stamping die is working, the guide post is subjected to lateral force. If this lateral force acts directly on the contact surface between the guide post and the guide sleeve, it will cause the contact pressure to concentrate in a local area. This invention uses an anti-friction sleeve as an intermediate transition layer to expand the range of the lateral force to the entire inner circumference surface of the anti-friction sleeve. Because the anti-friction sleeve has a large axial length and has annular reinforcing ribs to enhance rigidity, the lateral force is distributed over a larger area, and the contact pressure per unit area is significantly reduced. The wear rate is proportional to the contact pressure, and reducing the contact pressure directly slows down the wear process. The spiral design of the lubrication groove structure utilizes the reciprocating motion of the guide post to generate a pumping effect. When the guide post moves downward, the lubricating medium is pressed into the bottom of the spiral groove and flows along the spiral direction. When it moves upward, a negative pressure is generated in the spiral groove to attract and replenish the lubricating medium. This dynamic circulation of the lubricating medium ensures that the mating surfaces always maintain a sufficient lubricating film, avoiding the occurrence of boundary lubrication or dry friction. The V-shaped or U-shaped cross-section design of the lubrication groove provides good oil storage space and flow guidance. Solid lubricating material is filled in the groove as a lubricating reserve, providing solid lubrication protection when the liquid lubricating film breaks, forming a composite lubrication mechanism that combines liquid lubrication and solid lubrication. The locking ring securely fixes the anti-wear sleeve through a combination of threaded connection and serrated snap-fit structure, preventing loosening due to vibration and impact. The coaxial design of the circular boss ensures that the locking force is evenly distributed along the circumference, avoiding local stress concentration. The application of wear-resistant alloy material gives the anti-wear sleeve its own wear resistance, maintaining the geometric accuracy of the inner circumferential surface during long-term use. Therefore, based on mechanical analysis and tribological principles, this invention achieves the dual goals of reducing contact pressure and improving lubrication conditions through a reasonable structural configuration, effectively suppressing the wear phenomenon of the guide post and maintaining the guiding accuracy of the guide post.
[0040] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A structure for preventing uneven wear of guide pillars in stamping dies for household appliance parts, characterized in that, The device includes a guide post body, an anti-wear sleeve, a lubrication groove structure, and a locking ring. The guide post body is a cylindrical rod-shaped structure. The anti-wear sleeve is fitted onto the outer circumferential surface of the guide post body, and a fitting clearance is formed between the inner circumferential surface of the anti-wear sleeve and the outer circumferential surface of the guide post body. The lubrication groove structure is formed on the inner circumferential surface of the anti-wear sleeve and extends along the axial direction of the guide post body. The locking ring is located at the end of the anti-wear sleeve and is fixed to the end of the guide post body by a threaded connection.
2. The anti-wear structure for the guide pillar of a stamping die for household appliance parts according to claim 1, characterized in that, The axial length of the anti-wear sleeve is greater than three times the diameter of the guide post body.
3. The anti-wear structure for the guide pillar of a stamping die for household appliance parts according to claim 2, characterized in that, The lubrication groove structure is spirally distributed on the inner circumferential surface of the anti-wear sleeve, and the spiral angle of the lubrication groove structure is acutely related to the axis of the guide post body.
4. The anti-wear structure for the guide pillar of a stamping die for household appliance parts according to claim 3, characterized in that, The cross-section of the lubrication groove structure is a V-shaped or U-shaped groove.
5. The anti-wear structure for the guide pillar of a stamping die for household appliance parts according to claim 4, characterized in that, The outer circumferential surface of the anti-wear sleeve is provided with annular reinforcing ribs, which are evenly distributed along the axial direction of the anti-wear sleeve.
6. The anti-wear structure for the guide pillar of a stamping die for household appliance parts according to claim 5, characterized in that, The inner circumferential surface of the locking ring is provided with a serrated snap-fit structure, which forms an interference fit with the outer circumferential surface of the end of the guide post body.
7. The anti-wear structure for the guide pillar of a stamping die for household appliance parts according to claim 6, characterized in that, The anti-wear sleeve has a circular boss on its end face. The geometric center of the circular boss is coaxial with the axis of the guide post body. The locking ring is pressed against the outer end face of the circular boss.
8. The anti-wear structure for the guide pillar of a stamping die for household appliance parts according to claim 7, characterized in that, The anti-wear sleeve is made of wear-resistant alloy material.
9. The anti-wear structure for the guide pillar of a stamping die for household appliance parts according to claim 8, characterized in that, The groove depth of the lubrication groove structure is 1 / 4 to 1 / 3 of the wall thickness of the anti-wear sleeve.
10. The anti-wear structure for the guide pillar of a stamping die for household appliance parts according to claim 9, characterized in that, The gap between the anti-wear sleeve and the guide post body is filled with solid lubricating material, which is evenly distributed within the lubrication groove structure.