Punch for machining irregularly-shaped hole at thread of thin-wall part

Abstract

The invention discloses a punch for machining an irregularly-shaped hole at the thread of a thin-wall part. The punch is a cone and consists of a ligament part, an avoidance part, an exhaust passage and a polished rod clamping part, wherein the ligament part of a punch can be circular or hexagonal, an end face of the ligament part is perpendicular to the central line of the polished rod clamping part, the front face of the end face can be a plane or a concave face, and the rear part of the end face is a plane; the length of the ligament part is generally 0.2 mm to 1 mm; a section of avoidance part, of which the diameter is less than that of the ligament part by 0.02-0.05 mm, is arranged behind the ligament part; the ligament part is in smooth transition with the avoidance part, and the transition angle is 10-15 degrees; the exhaust passage is arranged in the punch; one end of the exhaust passage is led in from the center of the front end face of the ligament part, and the other end of the exhaust passage is led out from the middle part of the polished rod clamping part; and the diameter of the exhaust passage is 0.3-0.5 times that of the punch (or size of opposite sides) and is phi 0.3 mm at the minimum. According to the punch, the problem o discharge of gas and liquid in the irregularly-shaped hole during machining of the hole is effectively solved.

Description

technical field [0001] The invention relates to a punch, in particular to a punch for processing a special-shaped hole at the thread of a thin-walled part. technical background [0002] Parts with special-shaped holes in the threads of thin-walled materials are widely used in various industries, especially aviation and aerospace industries. When using traditional punches to process this type of parts, no matter what process plan is used, the thread will be locally deformed. The main cause of thread deformation is that the used parts are thin-walled materials, and the thickness of one side is less than 2mm. When using a traditional punch to process a special-shaped hole, the punch will instantly generate a strong pressure on the prepared hole, and the gas and liquid in the hole will not be able to flow smoothly. Exhausted, resulting in local swelling and deformation of the thread, when the gas pressure exceeds the capacity of the thin wall, the thin wall deforms. Contents ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects and insufficiencies of the thread deformation of this kind of parts processed by the traditional punch, the present invention has developed a punch for processing special-shaped holes in the threads of thin-walled parts

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