Method for machining blind hole wave-shaped thread without tool withdrawal groove through numerical control lathe

• Main Authors: ZHANG MIN, HUANG XIANQIU
• Format: Patent
• Language: Chinese; English
• Published: 07.05.2021
• Subjects: MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; THREAD CUTTING; TRANSPORTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTIONTHEREWITH

The invention discloses a method for machining a blind hole wave-shaped thread without a tool withdrawal groove through a numerical control lathe, and aims to provide a method for turning a thread without a tool withdrawal groove through a sharp tool. According to the method, a thread form is divided into a plurality of cutting points according to the geometrical shape of the thread form; cutting feeding is carried out on a blind hole by regarding all the cutting points as starting points in sequence, and the feeding distance each time is equal to the length of the thread; the feeding completing position each time is regarded as a tool withdrawal starting point of the cutting, and the tool is obliquely withdrawn to a preset ending point in the direction forming an included angle alpha with the feeding direction, and then quickly returns to the position of the next cutting point until thread cutting is completed n times; and alpha is smaller than or equal to 15 degrees or greater than 90 degrees. By means of t