ball screw assembly

There is still a certain gap between Chunxin and THK in terms of performance, precision, life and reliability, but in recent years Chunxin has made significant progress in technology learning from international brands, and some of Chunxin's high-end products are close to the technical level of THK. The following are the main differences: 1. Materials and heat treatment THK Ball Screw: Using high-quality alloy steel (such as SCM, SUJ2), strict heat treatment process (such as carburizing quenching, low temperature deep cryogenic treatment), uniform hardness, strong wear resistance, and good residual stress control. CHUNXIN Ball Screw: The material purity (such as GCr15) and heat treatment stability are slightly inferior, and uneven hardness or deformation is prone to occur, but Chunxin has now introduced advanced heat treatment equipment, and the gap is gradually narrowed. 2. Manufacturing process and precision THK Ball Screw: Precise grinding process (thread raceway roughness Ra≤0.1μm), precise preload control. The precision level can reach ISO P1~P3 (C0~C3), and the reverse clearance is extremely small (≤0.005mm). CHUNXIN Ball Screw: The low-end and mid-end products are mainly rolled, and the precision is mostly P5~P7 (C5~C7); the high-end ground screw can reach P3. There are still fluctuations in the consistency of preload force and the accuracy of raceway shape, but the process is improved through CNC grinders. 3. Life and reliability THK Ball Screw: The dynamic load life calculation is conservative (such as THK's nominal life can reach 100,000 hours), and the failure rate is low in actual use. CHUNXIN Ball Screw: The nominal life is close (refer to ISO 3408 standard), but due to the influence of materials, lubrication and assembly, noise may increase or precision may decrease after long-term use. Chunxin improves reliability by optimizing ball circulation design (such as the reverser structure). 4. Technological innovation THK Ball Screw: Many patented technologies (such as THK's "Hatchet" returner). Provide high value-added solutions (such as dustproof seals, high-speed silent design). CHUNXIN Ball Screw: Has advantages in customized services (such as non-standard strokes) and cost-effectiveness. 5. Price and delivery cycle THK Ball Screw: High price (about 2~3 times that of domestic products with the same specifications), long delivery cycle (usually 8~12 weeks). CHUNXIN Ball Screw: Obvious cost advantage (especially low-precision models), fast delivery (2~4 weeks for conventional models), suitable for scenarios with limited budgets or urgent replacement. Based on the above analysis, the Chunxin brand is gradually moving towards international standards. In the future, Chunxin will continue to learn to bring ball screws into intelligence through intelligence. If you are interested, please contact us at https://www.chunxinauto.com/contact, looking forward to your information.

Machining a retaining ring groove at the end of the ball screw (i.e. installing a retaining ring/circlip) to replace the nut and locking ball screw fixing method is a feasible solution, but it requires comprehensive consideration of the design, process and application scenario adaptability. The following is a detailed analysis: 1. Feasibility of the Snap Ring Groove Solution Advantages: Simplified structure: Eliminating nuts and locking screws reduces the number of parts and assembly steps. Loosening risk: Circlips are less likely to loosen under axial load (especially in low-vibration environments). Space saving: Circlip grooves occupy less space, making them suitable for compact designs. Limited axial load capacity: Circlips typically have lower axial load capacity than locknuts and may not be suitable for high-load or high-shock environments. High installation accuracy requirements: The machining accuracy of the snap ring groove (such as groove depth, width, and roundness) directly affects the retaining effect of the snap ring. Maintenance difficulties: Disassembly may require specialized tools, and repeated disassembly and assembly may cause wear in the snap ring groove. 2. Key Design Considerations Snap Ring Groove Machining: The groove dimensions must strictly match standard retaining ring specifications (such as DIN 471/472) to ensure that the retaining ring is fully seated and retains its elasticity. The groove bottom must be smooth and burr-free to avoid stress concentration that may cause cracking. CNC lathe machining is recommended to ensure the groove's perpendicularity to the axis and positional accuracy. Axial retaining rings (such as DIN 472) are preferred. Their thickness and elasticity must be sufficient to withstand the axial force of the screw. Adding a retaining ring washer may be considered to distribute the axial force and reduce wear on the groove. Auxiliary fixing measures: Add thread sealant or anaerobic adhesive to the outside of the retaining ring groove to further enhance anti-loosening performance. Combined with end screwing (threaded holes machined into the screw end face and screwed against the bearing inner ring) provides a double fixation. 3. Implementation Recommendations For light loads/low speeds: The retaining ring groove solution is feasible, but the retaining ring's condition requires regular inspection. For heavy loads/high vibration: It is recommended to retain the lock nut or use a double nut + lock washer combination. Verification testing: Simulate actual operating conditions (such as vibration and temperature rise) on a prototype to confirm whether the retaining ring exhibits axial movement. 4. Other Potential Improvements Bearing Seat Design: Check the preload and fit tolerances of the FK bearings to ensure the bearings are free of play. Screw Support: If space permits, a fixed-supported (rather than fixed-free) configuration can be used to reduce the risk of axial displacement. If a retaining ring groove solution is chosen, it is recommended to consult with the ball screw supplier to confirm the machinability of the end material (for example, whether the hardness allows for groove cutting) and to refer to similar application examples (such as the Z-axis mounting methods used on some small CNC machine tools).