Tool setting method for repairing thread by using numerically controlled lathe

Abstract

The invention discloses a tool setting method for repairing thread by using a numerically controlled lathe. The method comprises the following steps of: measuring the error of a thread track line of thread to be repaired and a reference track line by taking the thread track line of firstly processed thread as a reference; and adjusting an initial position of a tool nose to enable a processed thread track to be overlapped with the thread track to be repaired by changing the pulse phase of a zero phase of a main shaft encoder or changing a Z coordinate of the initial position of the tool nose. The method is specially designed for repairing the thread of a drilling tool by using the numerically controlled lathe, and has the characteristics of easiness in operation, accuracy in tool setting, high efficiency, quickness, light labor intensity of operating personnel, high practicability and the like; large-scale repair processing is facilitated; the thread of the drilling tool repaired through tool setting by using the method has higher quality; the repair frequency of a drilling tool joint is increased; and the service life of the drilling tool is prolonged. The method can be used for repairing the thread of the drilling tool joint under numerical control, and can also be applied to thread repair of all other parts of which the thread repair track is required to be overlapped with the original thread track in numerical control.

Description

technical field [0001] The invention relates to thread processing of parts, in particular to a tool setting method for repairing threads of a CNC lathe, which is suitable for thread repairing of various parts, especially for the threads of parts such as drilling tools, oil pipes and casing joints used in oil and gas development. repair. Background technique [0002] During the use of drilling tools, due to the impact of bumps, wear, corrosion, and multiple make-up and break-out of the thread, the thread parameters are likely to exceed the design standard requirements, which in turn affects the connection effect between the drilling tools, resulting in the entire drilling tool being in use. In order to ensure the normal use of the entire drilling tool, the threaded part of the drilling tool needs to be repaired. [0003] The thread maintenance of drilling tools is generally completed by ordinary lathes. The thread maintenance process is to manually insert the tip of the tool...

AI Technical Summary

Problems solved by technology

Due to the inherent mechanical error of ordinary lathes and the manual observation of tools during tool setting, the thread accuracy after maintenance is difficult to meet the design standard requirements, the product quality is not high, and even the drilling tools are scrapped in advance; in addition, the maintenance efficiency of ordinary lathes is relatively low. Low, high labor intensity of operators and other defects