In the process of processing, facing the different thread requirements of different customers, the methods we use are also different. The trapezoidal thread is longer, the cutting depth, the cutting force is high, the precision is high, and the processing is difficult. When machining ordinary threads, if the cutting depth of each tool is the same, the force on the cutting edges on both sides of the thread turning tool will increase sharply as the removal rate increases. Increased, resulting in decreased thread accuracy and tool damage. Therefore, it is necessary to pay attention to the need for multiple cycle feeds during cutting, and the cutting depth must be reduced in accordance with a certain proportion each time. Both internal and external threads are relatively common, and the processing is generally more difficult. Small, pay attention to the calculation of the bottom of the thread.
The main methods of thread cutting on CNC lathes are as follows: 1. Grooving rough cutting method, first use a grooving tool smaller than the width of the thread turning tool head to cut a groove, and then use the thread turning tool for thread processing. Large pitch is often used, but the operation and programming are extremely cumbersome. 2. Staggered cutting method, the thread car is staggered in the direction parallel to the left and right side of the tooth profile, until the bottom of the tooth, which is very suitable for large thread cutting, but the programming is more complicated. 3. The oblique advance method, pointing to the Z direction at the same time, there is also linkage in the X direction, forming an oblique cutting tool. At this time, the thread turning tool always has only one cutting edge to participate in the cutting, the chip removal is smoother, and the force and heat are both straighter than straight. The entry method is small, but when the thread depth is deep and the pitch is large, the phenomenon of knife sticking is likely to occur. 4. Straight forward method means that when the lathe is cutting, the Z-direction continues to make a linear movement without changing, and the X-direction feeds a cutting depth in stages, which is convenient, fast and efficient. Generally, ordinary threads with a small pitch can be used, but turning tools Easy to wear, chips will scratch the thread surface.
