Self-locking nut crimping processing method

Abstract

The invention discloses a self-locking nut crimping processing method, which comprises the following steps of: arranging a crimping clamp on crimping equipment; putting the positioning plane of a nut on the positioning surface of the crimping clamp, inputting preset parameters, starting up the equipment, driving a pressure head by a driving system to move to a position close to the outer surface of the nut at a high speed, feeding at a work speed, and crimping the nut; after the feeding is in place, stopping the pressure head, entering a pressure keeping stage, and after the pressure keeping is finished, quickly retreating the pressure head to a workpiece assembling and disassembling position; meanwhile, automatically recording the parameters by using a control system; measuring the crimping size of the nut, and measuring friction torque; if the nut is not qualified, modifying the nut crimping parameters, and repeating the steps of (2) and (3) on another nut; and if the nut is qualified through inspection, crimping nuts in batch by utilizing the parameters recorded by the control system. The product produced by the method has the advantages of high crimping dimensional accuracy, good product consistency, high production efficiency and strong adaptability.

Description

technical field [0001] The invention relates to the technical field of fasteners, in particular to a method for processing the closing of a self-locking nut. Background technique [0002] For self-locking closing nuts used in aerospace and other industries, the closing is made after the nut is made according to the conventional process, and the closing part of the nut is extruded by extrusion method, so that the screw hole of the closing part is along the radial direction. Plastic deformation occurs, and the radial size of the screw hole at the closing part is smaller than the radial size of the screw connected to it, so that when the screw connected to the nut enters the deformed screw hole of the nut, it is caused by the elastic deformation of the screw hole The radial pressure makes the nut tightly connected with the screw to achieve the purpose of anti-loosening. [0003] According to the structure, size and service conditions of self-locking nuts, the closures are divi...

AI Technical Summary

Problems solved by technology

The former is used to close the nut. Although its processing efficiency is high, it cannot achieve a reasonable speed conversion between the idle stroke and the working stroke during the processing. There is a serious impact load when closing, the deformation process is unstable, and the closing mold is very difficult. Difficult to achieve precise positioning, and unable to achieve pressure holding process, resulting in difficult to guarantee the dimensional accuracy of the nut closure, high defective rate of nut closure

In addition, the conditions of noise, safety and environment are poor when the punch press is working

The latter is used to close the nut, although it can achieve stable loading and pressure-holding effect when the nut is closed, but it is not suitable for rapid switching between high and low speeds between the idle stroke and the working stroke, and the production efficiency is low.

In addition, this type of equipment needs to manually adjust the limit device, which is inconvenient and difficult to achieve quantitative and accurate adjustment of the closing size

In addition, the environmental conditions such as noise, leakage, and waste oil treatment of the hydraulic closing machine are also relatively poor