Thrust ring electroplating process for reversing system of heavy truck
By performing the process of primary overall electroplating and secondary spherical separate electroplating of the thrust ring, combined with the use of shielding ring and barrier ring, the problem of uneven thrust ring coating is solved, and the pass rate and plating efficiency are improved.
Patent Information
- Application Number
- CN202510361982.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2025-06-27
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, the chrome plating treatment of the thrust ring is due to the strong current absorption capacity at the spherical tip, which leads to uneven coating, which cannot meet the target size requirements, affecting the pass rate.
A thrust ring electroplating process for heavy-duty truck reversing system is adopted. The entire thrust ring is coated through primary electroplating, and the spherical surface of the thrust ring is separately electroplating through secondary electroplating. The plating solution is partially shielded by shielding ring and barrier ring to ensure uniform plating at the spherical tip.
The uniformity of the thrust ring surface plating is achieved, the target size requirements are met, the pass rate is improved, the electroplating time is shortened, and the electroplating efficiency is improved.
Smart Images
Figure CN120210903A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a plating process for a thrust ring used in a heavy truck reversing system, belonging to the field of electroplating technology. Background Art
[0002] The thrust ring, also called a thrust washer, is applied in the heavy truck reversing system. It mainly bears axial loads and reduces the friction between rotating parts. When shifting gears in a heavy truck, rotating parts such as gears and bearings will be subjected to strong axial forces (such as shifting impact forces). The thrust ring is installed between the shaft and the housing, directly bearing and dispersing these axial forces to prevent components from deforming or being damaged due to overload.
[0003] The material of the thrust ring is alloy steel, which is subjected to quenching heat treatment and needs to be chrome-plated on the surface. The ring hole of the thrust ring includes a first hole section and a second hole section. The first hole section is cylindrical, and the inner wall of the second hole section is spherical. There are two blind holes provided at one end of the thrust ring close to the first hole section, and the two blind holes are circumferentially distributed. During the chrome plating of the thrust ring, because the spherical tip part has a strong ability to absorb current, the local coating is very thick, and the overall coating on the spherical surface is uneven. Eventually, there will be a large variation in the spherical size, which cannot meet the target size requirements.
[0004] Therefore, there is a need for a plating process for a thrust ring used in a heavy truck reversing system to improve the uniformity of the surface coating of the thrust ring, meet the target size requirements, and improve the qualified rate. Summary of the Invention
[0005] The technical problem to be solved by the present invention is: in order to overcome the deficiencies of the prior art, to provide a plating process for a thrust ring used in a heavy truck reversing system that can improve the uniformity of the surface coating of the thrust ring, meet the target size requirements, and improve the qualified rate.
[0006] The technical solution adopted by the present invention to solve the above problems is: a plating process for a thrust ring used in a heavy truck reversing system, including the following steps: Step S1, primary plating; Plating the entire thrust ring; Step S1.1, fixing the thrust ring on the plating fixture; Step S1.2, placing the plating fixture in the plating tank and submerging the thrust ring in the plating solution; Step S1.3, performing the plating operation; Step S1.4, after taking out the plated thrust ring from the plating solution, then removing the thrust ring from the plating fixture; Step S2, secondary plating; Individually plating the second hole section of the thrust ring; Step S2.1: Fix the thrust ring on the electroplating tooling again, and shield and screen the outer peripheral wall of the thrust ring, one end of the thrust ring with a blind hole, and the inner peripheral wall of the first through hole through the electroplating tooling; Step S2.2: Place the electroplating tooling in the electroplating tank and immerse the thrust ring in the electroplating solution; Step S2.3: Perform the electroplating operation; Step S2.4: After taking out the electroplated thrust ring from the electroplating solution, then remove the thrust ring from the electroplating tooling.
[0007] Preferably, in step S1.3, chromium ions are reduced to metallic chromium by electrolysis and deposited on the surface of the thrust ring. The electroplating duration is 10 minutes, the current during electroplating is 1200 A, and a coating of 5 μm - 8 μm is plated on the entire surface of the thrust ring.
[0008] Preferably, in step S2.3, chromium ions are reduced to metallic chromium by electrolysis and deposited on the surface of the thrust ring. The electroplating duration is 75 minutes, the current during electroplating is 600 A, and a coating of 30 μm - 35 μm is formed on the inner peripheral wall of the second hole section.
[0009] Preferably, the electroplating tooling includes a hanging tool and two connecting rods. The two connecting rods are arranged in parallel, and one end of the connecting rod is detachably and fixedly connected to the hanging tool.
[0010] Preferably, the hanging tool includes a hook part and a connecting part. The hook part is used for hanging on the electroplating tank, and the connecting rod is connected to the connecting part.
[0011] Preferably, the electroplating tooling further includes a shielding ring, and the shielding ring is connected to the connecting rod; The shielding ring includes an inner ring, a side ring, and an outer ring. The inner ring and the outer ring are sequentially distributed from the inside to the outside on one side of the side ring. Two round holes are provided on the side ring, and the two round holes correspond to the two connecting rods one by one.
[0012] Preferably, a stepped hole is provided on the side of the outer ring away from the side ring, and a retaining ring is coaxially arranged in the stepped hole.
[0013] Preferably, a through hole is provided on the retaining ring.
[0014] Preferably, the connecting rod includes a fixed section and a plugging section. One end of the fixed section is connected to the hanging tool, and the plugging section is arranged at the other end of the fixed section. The diameter of the plugging section is smaller than that of the fixed section.
[0015] Preferably, it further includes step S3: machining the blind hole; Machine the inner wall of the blind hole to remove the screw in the blind hole.
[0016] Compared with the prior art, the advantages of the present invention are as follows: For the electroplating process of the thrust ring used in the heavy truck reversing system of the present invention, after the overall plating of the thrust ring is carried out by primary electroplating first, the spherical surface of the thrust ring is electroplated separately by secondary electroplating, so that the coating at the tip of the spherical surface is more uniform, meeting the target size requirements and improving the qualification rate. Secondly, the electroplating time is also shortened and the electroplating efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a schematic structural diagram of the electroplating tooling in step S1; Figure 2 is Figure 1 a cross-sectional view of Figure 3 is a schematic structural diagram of the electroplating tooling in step S2; Figure 4 is Figure 3 a cross-sectional view of Figure 5 is Figure 4 an enlarged view of part A of Figure 6 is a schematic structural diagram of the connecting rod; Figure 7 is a schematic structural diagram of the shielding ring; Figure 8 is a schematic structural diagram of the retaining ring; Figure 9 is a schematic structural diagram of the thrust ring; Figure 10 is Figure 9 a cross-sectional view of
[0018] Wherein: hanger 1, connecting rod 2, screw 3, shielding ring 4, retaining ring 5; hook part 11, connecting part 12; fixed section 21, inserted section 22; side ring 41, inner ring 42, outer ring 43, stepped hole 44, round hole 45; through hole 51; thrust ring 100; first hole section 101, second hole section 102, blind hole 103. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] As Figure 1-10 shown, an electroplating process of a thrust ring used in a heavy truck reversing system in this embodiment includes the following steps: Step S1, primary electroplating; The overall electroplating of the thrust ring 100 is carried out; Step S1.1, fixing the thrust ring 100 on the electroplating tooling; The electroplating tooling includes a hanger 1 and two connecting rods 2. The two connecting rods 2 are arranged in parallel. The two connecting rods 2 correspond to the two blind holes 103 one by one. One end of the connecting rod 2 is detachably and fixedly connected to the hanger 1 by a screw 3. The other end of the connecting rod 2 is inserted into the blind hole 103. Here, threads are provided in the blind hole 103, and the connecting rod 2 is threadedly connected to the blind hole 103. In this way, the stability of the connection between the connecting rod 2 and the thrust ring 100 is improved; Step S1.2: Place the electroplating tooling in the electroplating tank and immerse the thrust ring 100 in the electroplating solution; The hanger 1 includes a hook part 11 and a connecting part 12. The hook part 11 is used for hanging on the electroplating tank, and the connecting rod 2 is connected to the connecting part 12; Step S1.3: Perform the electroplating operation; Utilize electrolysis to reduce chromium ions to metallic chromium and deposit them on the surface of the thrust ring 100. The electroplating duration is 10 min, the current during electroplating is 1200 A, and a 5 μm - 8 μm coating is plated on the entire surface of the thrust ring 100; Step S1.4: After taking out the electroplated thrust ring 100 from the electroplating solution, then remove the thrust ring 100 from the electroplating tooling; Step S2: Secondary electroplating; Perform separate electroplating on the second hole section 102 of the thrust ring 100; Step S2.1: Fix the thrust ring 100 on the electroplating tooling again, and shield and screen the outer peripheral wall of the thrust ring 100, one end of the thrust ring 100 provided with the blind hole 103, and the inner peripheral wall of the first through hole 51 through the electroplating tooling; The electroplating tooling further includes a shielding ring 4, and the shielding ring 4 is connected to the connecting rod 2; The shielding ring 4 includes an inner ring 42, a side ring 41, and an outer ring 43. The inner ring 42 and the outer ring 43 are sequentially distributed on one side of the side ring 41 from the inside to the outside. A stepped hole 44 is provided on the side of the outer ring 43 away from the side ring 41. A retaining ring 5 is coaxially arranged in the stepped hole 44. A through hole 51 is provided on the retaining ring 5. Two round holes 45 are provided on the side ring 41. The two round holes 45 correspond to the two connecting rods 2 one by one; The connecting rod 2 includes a fixed section 21 and a plugging section 22. One end of the fixed section 21 is connected to the hanger 1, the plugging section 22 is arranged at the other end of the fixed section 21, the plugging section 22 is inserted into the blind hole 103, and the diameter of the plugging section 22 is smaller than that of the fixed section 21; When the shielding ring 4 is installed on the electroplating tooling, the two plugging sections 22 respectively pass through the two round holes 45, and the outer ring 43 is located on the side of the plugging section 22 away from the fixed section 21. At the same time, the outer ring 43 abuts against one end of the fixed section 21 close to the plugging section 22; When the thrust ring 100 is placed inside the shielding ring 4, the insertion section 22 is threadedly connected to the blind hole 103. One end of the thrust ring 100 provided with the blind hole 103 is in contact with the side ring 41, the outer peripheral wall of the thrust ring 100 is in contact with the inner peripheral wall of the outer ring 43, and the inner peripheral wall of the first hole section 101 is in contact with the inner peripheral wall of the inner ring 42. After that, the retaining ring 5 is fixed in the stepped hole 44, and at this time, the retaining ring 5 is located on the side of the thrust ring 100 away from the fixed section 21; Step S2.2: Place the electroplating fixture in the electroplating tank and immerse the thrust ring 100 in the electroplating solution; The hanger 1 includes a hook portion 11 and a connecting portion 12. The hook portion 11 is used for hanging on the electroplating tank, and the connecting rod 2 is connected to the connecting portion 12; Step S2.3: Perform the electroplating operation; Using electrolysis, chromium ions are reduced to metallic chromium and deposited on the surface of the thrust ring 100. The electroplating duration is 75 minutes, the current during electroplating is 600 A, and a coating layer with a thickness of 30 μm - 35 μm is formed on the inner peripheral wall of the second hole section 102; Step S2.4: After taking out the electroplated thrust ring 100 from the electroplating solution, remove the thrust ring 100 from the electroplating fixture; Step S3: Machine the blind hole 103; Machine the inner wall of the blind hole 103 to remove the screw 3 in the blind hole 103; Here, the purpose of the first electroplating is to lay the foundation for the second electroplating. During the second electroplating process, the thrust ring 100 is shielded by the shielding ring 4, and only the inner wall of the second hole section 102 is coated, that is, only the spherical surface is plated. At the same time, by increasing the shielding current of the retaining ring 5, the coating on the tip of the spherical surface is made more uniform, and through the through hole 51 on the retaining ring 5, it is convenient to exhaust gas during the electroplating process, reducing coating defects; Here, Table 1 is obtained by collecting the electroplating time and qualification rate of the thrust ring 100 before and after improvement: Table 1: Comparison table of electroplating time and qualification rate of the thrust ring 100 before and after improvement
[0020] According to the data in Table 1, it can be obtained that the qualification rate after improvement has increased by 60%, and the electroplating efficiency has increased by 53%; In summary, first, the entire thrust ring 100 is coated through the first electroplating, and then the spherical surface of the thrust ring 100 is electroplated separately through the second electroplating, making the coating on the tip of the spherical surface more uniform, meeting the target size requirements, and improving the qualification rate. Secondly, the electroplating time is also shortened, and the electroplating efficiency is improved; In addition to the above embodiments, the present invention also includes other implementation manners. Any technical solutions formed by equivalent transformation or equivalent substitution shall fall within the protection scope of the claims of the present invention.
Claims
1. A thrust ring electroplating process for a heavy truck reversing system, characterized in that: The steps include: Step S1, primary electroplating; The thrust ring (100) is electroplated as a whole; Step S1.1, fixing the thrust ring (100) on the electroplating tool; Step S1.2, placing the electroplating device in the electroplating tank, and immersing the thrust ring (100) in the electroplating solution; Step S1.3, performing electroplating; Step S1.4, after the electroplating is completed, the thrust ring (100) is taken out from the electroplating solution, and then the thrust ring (100) is removed from the electroplating tool; Step S2, secondary electroplating; The second hole section (102) of the thrust ring (100) is electroplated separately; Step S2.1, fixing the thrust ring (100) on the electroplating tool again, and shielding the outer peripheral wall of the thrust ring (100), one end of the thrust ring (100) provided with the blind hole (103), and the inner peripheral wall of the first through hole (51) by using the electroplating tool; Step S2.2, placing the electroplating device in the electroplating tank, and immersing the thrust ring (100) in the electroplating solution; Step S2.3, performing electroplating; Step S2.4, after the electroplating is completed, the thrust ring (100) is taken out from the electroplating solution, and then the thrust ring (100) is removed from the electroplating tool.
2. The electroplating process for a thrust ring for a heavy truck reversing system according to claim 1 is characterized in that: In the step S1.3, chromium ions are reduced to metallic chromium by electrolysis and deposited on the surface of the thrust ring (100). The electroplating duration is 10 minutes and the current during the electroplating is 1200A. The entire surface of the thrust ring (100) is plated with a coating of 5 μm to 8 μm.
3. The electroplating process for a thrust ring for a heavy truck reversing system according to claim 1 is characterized in that: In step S2.3, chromium ions are reduced to metallic chromium by electrolysis and deposited on the surface of the thrust ring (100). The electroplating duration is 75 minutes and the current during the electroplating is 600A. A coating of 30 μm to 35 μm is formed on the inner peripheral wall of the second hole section (102).
4. The electroplating process for a thrust ring for a heavy truck reversing system according to claim 1 is characterized in that: The electroplating tool comprises a hanger (1) and two connecting rods (2), wherein the two connecting rods (2) are arranged in parallel, and one end of the connecting rod (2) is detachably fixedly connected to the hanger (1).
5. The electroplating process for a thrust ring for a heavy truck reversing system according to claim 4 is characterized in that: The hanger (1) comprises a hook portion (11) and a connecting portion (12); the hook portion (11) is used for hanging on an electroplating tank, and the connecting rod (2) is connected to the connecting portion (12).
6. The electroplating process for a thrust ring for a heavy truck reversing system according to claim 4 or 5, characterized in that: The electroplating tool further comprises a shielding ring (4), wherein the shielding ring (4) is connected to the connecting rod (2); The shielding ring (4) comprises an inner ring (42), a side ring (41) and an outer ring (43); the inner ring (42) and the outer ring (43) are sequentially distributed on one side of the side ring (41) from the inside to the outside; the side ring (41) is provided with two circular holes (45); the two circular holes (45) correspond one to one to the two connecting rods (2).
7. The electroplating process for a thrust ring for a heavy truck reversing system according to claim 6 is characterized in that: A step hole (44) is provided on a side of the outer ring (43) away from the side ring (41), and a retaining ring (5) is coaxially provided in the step hole (44).
8. The electroplating process for a thrust ring for a heavy truck reversing system according to claim 7, characterized in that: The retaining ring (5) is provided with a through hole (51).
9. The electroplating process for a thrust ring for a heavy truck reversing system according to claim 6, characterized in that: The connecting rod (2) comprises a fixed section (21) and an inserting section (22); one end of the fixed section (21) is connected to the hanger (1); the inserting section (22) is arranged at the other end of the fixed section (21); and the diameter of the inserting section (22) is smaller than the diameter of the fixed section (21).
10. The electroplating process for a thrust ring for a heavy truck reversing system according to claim 1, characterized in that: The step also includes step S3, machining a blind hole (103); The inner wall of the blind hole (103) is machined to remove the screw (3) in the blind hole (103).