Method for repairing small standoff during on-line oil sleeve external thread production

Abstract

The invention relates to a method for repairing small standoff during on-line oil sleeve external thread production. The method is characterized in that an oil sleeve with small external thread standoff is fixed to a chuck, on-line repair is performed, the standoff is -d1, and a coordinate system used during machining of external threads is used as a coordinate system during the repair. The method includes the following processing steps that (1) Z-axis cutter compensation of a threaded blade is adjusted, and a cutter compensation value is n*P, wherein n is a positive integer ranging from 1 to 3, and P is the thread pitch of the external threads; (2) the end face, the excircle and the outer chamfer of sleeve blank of the oil sleeve are machined; (3) X-axis cutter compensation of the threaded blade is adjusted, and a cutter compensation value is (d1+d)*T, wherein d is the standoff required by the oil sleeve external threads, and T is the taper of the external threads; (4) after adjustment, an instruction G33 is used for machining the external threads in an equal thread pitch mode, namely, the repair of the small standoff during on-line oil sleeve external thread production is completed. According to the method, the threads do not need to be cut off totally, and the repair can be completed with the length of the sleeve blank being sacrificed to the least degree.

Description

technical field [0001] The invention relates to a method for repairing the tight distance of oil casing pipes, in particular to a method for repairing the outer threads of oil casing pipes which are produced on-line (on a machine tool without releasing the jaws) and the tight distance is relatively small. Background technique [0002] The tolerance of round thread of oil casing is generally relatively large, while the tolerance of partial trapezoidal thread is relatively small. Large, you can directly adjust the tool compensation of the thread cutter, and then perform threading again, and the tight distance of the thread can be processed to the required tolerance range. If the close distance has exceeded the minimum value, the general processing plant will directly cut off the entire thread and re-thread. Processing, sometimes the length of the tube blank is close to the lower limit. When the cutting head is reprocessed, it is found that the tube blank is short (cut off the ...

AI Technical Summary

Problems solved by technology

[0002] The tolerance of the oil casing round thread is generally relatively large, while the tolerance of the partial trapezoidal thread is relatively small. The range of the close distance of the external thread is 2.54mm to 5.08mm. It is inevitable that the close distance will be out of tolerance during processing. Large, you can directly adjust the tool compensation of the thread cutter, and then perform threading again, and the tight distance of the thread can be processed to the required tolerance range. If the close distance exceeds the minimum value, the general processing plant will directly cut off the entire thread and re-thread. Processing, sometimes the length of the tube blank is close to the lower limit. When the cutting head is reprocessed, it is found that the tube blank is short (cut off the threaded part), which does not meet the contract requirements. The tube is basically scrapped unless it is made into a short joint, but the short joint Generally, there are few contracts and not many tube blanks are needed, which will cause losses to the company

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