Cutting tool and processing method for precision machining variable groove width internal thread

Abstract

The invention provides a tool for precisely machining an internal thread with variable groove width. The tool for precisely machining the internal thread with variable groove width comprises a cuttingblade, a movable sliding block connected with the cutting blade through bolts and a base connected with the movable sliding block through springs. The cutting blade comprises a blade body portion, amain cutting edge located on the upper edge of the blade body portion and side cutting edges located on two side edges of the blade body portion. The main cutting edge, the side cutting edges and theblade body portion are integrally formed. The circular arc radius of the main cutting edge and the side cutting edges is 0.1 mm. The circular arc transition radius of the side cutting edges and the blade body portion is 0.3 mm. The invention further provides a machining method for conducting precise machining on the internal thread with variable groove width by utilizing the tool. The tool and themachining method for precisely machining the internal thread with variable groove width have the beneficial effects that it is avoided that the cutting depth need to be adjusted constantly through adjusting fixture end displacement of machine tools in the process of turning the internal thread, and meanwhile, rough machining and precise machining of the internal thread are finished simultaneously.

Description

【Technical field】 [0001] The invention relates to the technical field of machining, in particular to a cutting tool and a machining method for precisely machining variable groove width internal threads. 【Background technique】 [0002] The variable groove width thread connection of oil pipe or air pipe not only needs to be tightly and reliably connected, but also needs to have high sealing performance, which puts forward higher requirements for the machining accuracy of variable groove width internal and external threads. Currently, turning is an effective method for efficiently machining threads. Due to the length of the oil pipe used for connection is relatively large, exceeding 15 meters, and the diameter is relatively large, exceeding 0.5 meters. In the existing processing technology, comb-tooth cutters are used for turning processing, but the large-size oil pipe thread is clamped in the machine tool. Turning for turning processing causes changes in the kinematic chain t...

AI Technical Summary

Problems solved by technology

Due to the length of the oil pipe used for connection is relatively large, exceeding 15 meters, and the diameter is relatively large, exceeding 0.5 meters. In the existing processing technology, comb-tooth cutters are used for turning processing, but the large-size oil pipe thread is clamped in the machine tool. Turning for turning processing causes the kinematic chain transmission and counterweight ratio of the machine tool to change, resulting in machining errors. However, because the width of the internal thread with variable groove width is gradually reduced, the depth of the thread is gradually reduced.

In the turning process of internal thread, it is necessary to gradually adjust the cutting depth to meet the processing requirements of variable groove width and variable depth internal thread. In the process of adjusting the cutting depth, due to the large cutting force in traditional thread processing, the turning Difficulty in finely adjusting depth of cut during threading, resulting in machining errors

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