Internal thread machining tool for thin-wall pipe fitting

Abstract

The invention discloses an internal thread machining tool for a thin-wall pipe fitting. The internal thread machining tool comprises a tool rod, wherein a blade group is installed at one end of the tool rod; the blade group is composed of 36 same blades coaxially and continuously assembled on the tool rod; and the blades are closely bonded together, and the angle difference of the base surfaces of each two blades is 10 degrees in sequence from one end of the blade group. Relative to an existing thread tap, the machining tool provided by the invention realizes the functions of milling, chip breaking and cutting, and is small in cutting deformation, low in cutting force and low in stress due to local contact, thereby solving the problems of thread tooth breakage, tap deviation and the like during common tap tapping for 316 stainless steel with extremely-high machining hardenability; and in addition, the tool provided by the invention is formed through assembling the tool rod and the plurality of same blades, is low in machining cost, and realizes the purpose of a tool for an unconventional internal thread hole.

Description

technical field [0001] The invention relates to the technical field of tool design, in particular to a tool for machining internal threads of thin-walled pipe fittings. Background technique [0002] 316 stainless steel thin-walled internal thread pipe fittings are often used in the field of aerospace satellites because they can meet some special purposes, and they are difficult-to-machine parts. If the thin-walled internal thread pipe fittings made of stainless steel and with a wall thickness of 0.7mm are processed by traditional processing tool thread taps, there will be the following problems: [0003] 1) The wall of the pipe fittings is thin and rigid, and it is easy to be elastically deformed; the good plasticity and toughness of 316 stainless steel are prone to serious work hardening, which is easy to cause damage to the cutting edge of the tool; both of these determine that the cutting force of the processing tool cannot If it is too large, when the conventional tap i...

AI Technical Summary

Problems solved by technology

[0003] 1) The wall of the pipe fittings is thin and rigid, and it is easy to be elastically deformed; the good plasticity and toughness of 316 stainless steel are prone to serious work hardening, which is easy to cause damage to the cutting edge of the tool; both of these determine that the cutting force of the processing tool cannot If it is too large, when the conventional tap is used for tapping, due to the extrusion of the thread side to the side of the tap cutter tooth, the axial component force of the tap is usually several times the tangential force, so the resultant cutting force is large, and there will be a phenomenon of failure to tap

[0004] 2) When conventional taps process stainless steel materials, due to the good toughness and strength of the processed material, and the elongation rate is good, but the cutting force of the tap is too large, it is easy to bond with the tool during the processing process to produce accumulated cuts, thus straining Thread profile, resulting in rotten teeth

[0005] 3) During the working process of the tap, when the unequal radial force is large during multi-tooth cutting, the axis of the tap will be offset relative to the axis of the hole, causing the tap to deviate, etc.

Images