1. When the slender screw is quenched and tempered, it needs to be drilled in the process because it needs to be vertically hoisted.
2. If the bending of the blank is required in the specified process, cold straightening is absolutely not allowed, mainly because when the steel is rolled, a large amount of internal stress will be generated during the whole process. After straightening, , If the stress is not removed by heat treatment again, the original state will be restored directly after the rough turning.
3. After rough turning, quenching and tempering is needed. The main purpose is to effectively improve the structure of the material. The slender grains can effectively eliminate the internal stress and effectively improve the cutting performance. improve.
4. In order to effectively ensure the accuracy of the transmission screw rod, it will remain unchanged after long-term use. It is best to perform a second temperature aging treatment during the processing process, and the first time can be arranged behind the semi-finished car , The purpose is mainly to eliminate the internal stress after cutting and processing, effectively ensure the stability of the screw rod in size, and once it can be arranged after the rough turning of the thread, because the entire cut is still in the machining allowance It is relatively large, and the fiber organization on the cut material will cause deformation, so after straightening, the entire plastic deformation will cause the internal residual stress to increase, so the aging treatment must be arranged in time to let The entire internal stress can be fully released.