Thread rolling machines generally do not have a centering device for thread rolling when they leave the factory; they only have a flat support plate for placing the workpiece. This creates a problem: when rolling a short section of thread onto a long workpiece, workpiece wobbling will inevitably occur. For first-precision threads, this will cause dimensional deviations and the thread parameters will not meet technical requirements.
Thread rolling machines are mainly used for cold rolling forming. Cold rolling is an advanced chipless machining process that uses rolling tools for extrusion forming. The rolled metal fibers are continuous, and the radial pressure generated by rolling effectively improves the surface finish, hardness, and strength of the workpiece, increasing work efficiency by several times, or even tens of times, compared to chip machining, thus saving materials and making it easier to automate.
How to properly maintain a thread rolling machine during operation:
1. Operators must pass an examination and obtain an operator's certificate before operating the machine. Operators should be familiar with the machine's performance and structure and must comply with safety and shift handover procedures.
2. Before operation, strictly follow the lubrication regulations to add oil, ensuring the oil level is appropriate, the oil passage is unobstructed, the oil level indicator (window) is clearly visible, and the oil cups are clean. 3. Check all fasteners for looseness, ensure the control mechanisms are flexible and reliable, and verify the safety devices are in good working order.
4. Before starting work, run the machine tool idle for 5-10 minutes to confirm that the lubrication, hydraulic, electrical systems, and all transmission components are operating normally before commencing work.
5. According to the processing requirements of the workpiece, correctly select and install the thread rolling die, rolling mold, and straightening mold. Simultaneously, correctly adjust the thread position and end face of the thread rolling die, and adjust the taper of the thread on the workpiece. When machining large workpieces, minimize the span between the bearing seats of the fixed and movable spindles to improve spindle rigidity. When machining smaller workpieces using cantilever rolling, the rolling force should not exceed 58800N, and the thread rolling die width should not exceed 40mm.
6. During operation, frequently monitor the machine's operation, ensuring the accuracy and reliability of all interlocking, limit, and feed mechanisms. If any abnormalities are found, promptly inspect and address them.
