What are the programming methods for three types of thread cutting on CNC lathes?

What are the programming methods for three types of thread cutting on CNC lathes?

In current CNC lathes, there are generally three machining methods for thread cutting: G32 straight cutting method, G92 straight cutting method, and G76 oblique cutting method. Due to different cutting methods and programming methods, machining errors are also different. Careful analysis is necessary in operation and use, striving to produce high-precision parts.

1. The G32 direct cutting method has a high cutting force and difficulty in cutting due to the simultaneous operation of both cutting edges. Therefore, both cutting edges are prone to wear during cutting. When cutting threads with larger pitch, due to the larger cutting depth, the blade wear is faster, resulting in errors in the pitch diameter of the thread; However, its machining accuracy is relatively high, so it is generally used for small pitch thread machining. Due to its tool movement and cutting being completed through programming, the machining program is relatively long; Due to the easy wear of the blade, it is necessary to measure frequently during processing.

2. The G92 direct cutting method simplifies programming and improves efficiency compared to the G32 instruction.

3. After the completion of thread processing, the quality of the thread can be judged by observing the thread profile and taking timely measures. When the thread crest is not pointed, increasing the cutting amount of the knife will actually increase the diameter of the thread, which depends on the plasticity of the material. When the crest has been sharpened, increasing the cutting amount of the knife will proportionally reduce the diameter. Based on this characteristic, the cutting amount of the thread should be treated correctly to prevent scrap.

CNC lathe

4. The G76 oblique cutting method, due to its single-sided edge machining, is prone to damage and wear of the machining blade, resulting in uneven threaded surfaces and changes in the tool tip angle, leading to poor tooth profile accuracy. However, due to its single-sided blade operation, the tool load is relatively small, chip removal is easy, and the cutting depth is decreasing. Therefore, this processing method is generally suitable for machining large pitch threads. Due to its easy chip removal and good blade processing conditions, this machining method is more convenient in situations where high thread accuracy is not required. When processing high-precision threads, two cutting can be used to complete the machining, first using the G76 machining method for rough turning, and then using the G32 machining method for fine turning. However, it is important to note that the starting point of the cutting tool should be accurate, otherwise it is easy to make mistakes and cause the parts to be scrapped.

Jiangsu Boshang Industrial Equipment Co., Ltd. is a comprehensive and specialized technology company that specializes in research and development, manufacturing of CNC machine tools and industrial robots, and providing intelligent solutions. Boshang Company has an infinite desire to explore cutting-edge technologies and possesses the ability to realize lofty ideals. At present, the company has multiple series of CNC machine tools and complete automation/intelligent solutions in the field of metal cutting. I have a profound understanding of the intelligent development of the manufacturing industry and have accumulated rich experience.