Digital controlled small hole machine electrode rotating control device and method

Abstract

The invention discloses a digital controlled small hole machine electrode rotating control device and an application method of the device and a digital controlled small hole machine provided with thedevice, wherein the electrode rotating control device comprises a stepping motor, a rotor, a rubber ring, a stator, a linear array scanning camera and a driving circuit, wherein the stepping motor drives an electrode tube through a rotating head, the rotor is provided with a central hole, the motor is provided with coded graphics; the rubber ring is arranged in the central hole, the electrode tubepenetrates into the rubber ring; the stator is matched with the rotor; the linear array scanning camera is fixed with the stator, matched with the coded graphics and used for detecting the rotating speed of the rotor; and the driving circuit supplies electricity for the stator, drives the rotor to rotate, and is respectively connected with a motor driver of the stepping motor and the linear arrayscanning camera. The digital controlled small hole machine electrode rotating control device and the application method of the device and the digital controlled small hole machine provided with the device can effectively improve the processing quality of small holes.

Description

technical field [0001] The present application relates to the field of numerically controlled small hole machines, in particular to a numerically controlled small hole machine electrode rotation control device, an application method of the device, and a numerically controlled small hole machine equipped with such a device. Background technique [0002] CNC electric machining small hole machine (hereinafter referred to as small hole machine) is a kind of electric discharge machine tool, which uses a continuously moving slender hollow copper tube as a tool electrode (hereinafter referred to as electrode), and passes through the medium that passes through the hole of the copper tube. (working fluid) discharges with the workpiece, and performs pulse spark discharge on the workpiece to etch the metal to achieve the purpose of perforation. This equipment is mainly used for processing microscopic holes in conductive materials such as superhard steel and cemented carbide. EDM erosio...

AI Technical Summary

Problems solved by technology

Due to factors such as the force on the rotating shaft, uneven distribution of electrode mass, and limited electrode stiffness, the electrode shakes greatly when rotating, and the guide on the guide frame must be used to limit the shake (the diameter of the inner hole of the guide is larger than the diameter of the electrode). Limited often cause serious consequences such as large aperture, irregular shape, surface damage, or deviation of upper and lower apertures

At the same time, due to the excessive shaking of the electrode, the gap discharge is out of control, and even causes a short circuit between the electrode and the workpiece, which seriously affects the processing quality and efficiency. The current small hole machine rotary liquid supply device mainly has the following shortcomings:

[0006] 1. Because the electrode (that is, the electrode tube) is slender and hollow, and the mass distribution of the electrode is uneven, the electrode shakes when it rotates, and the passive limiting effect of the guide still exists.

In addition, the "contact" between the electrode and the guide produces a new resistance moment, which turns the large-amplitude shaking into a small-amplitude, fast-frequency, and messy trajectory shaking, which directly affects the shape, dimensional accuracy and processing efficiency of the processed hole.

[0007] 2. Since the high-pressure liquid supply parts must be installed in the upper part of the rotary head, direct motor shaft drive cannot be used, and synchronous belt drive must be used

The radial load of the synchronous belt pressing force on the rotating shaft is relatively large, the rigidity of the rotating shaft (because the electrode must pass through the rotating shaft, and the rotating shaft is not solid), the supporting force of the bearing, and the disturbance of the synchronous belt transmission, etc., will cause the electrode to rotate. Shaking occurs evenly, which directly affects the shape, dimensional accuracy and processing efficiency of the processed hole

[0008] 3. Since the torque of dragging and rotating acts on the upper part of the electrode, and the electrode itself is slender and hollow, when the processing end (the lower part of the electrode) is disturbed by various small resistances, its rotation trajectory will change, directly affecting the shape of the processing hole, Dimensional accuracy and processing efficiency

[0009] 4. Because the electrode is in the small hole of the workpiece during processing, the monitoring and abnormal handling mechanism cannot be installed, and the stepper motor that drags and rotates runs at a constant speed mode (electromagnetic torque adaptive load capacity). Once the electrode shakes too much or "Abnormal" contact will not only seriously affect the quality of the processed workpiece, but even cause the entire workpiece to be scrapped

[0010] 5. Due to the difficulty of predicting the loss of the electrode during processing, it is impossible to accurately judge whether the through hole is processed when processing a certain depth hole, resulting in low processing efficiency of the system, the through hole is not pierced or seriously affects the processing quality of the next hole, etc. As a result, through-hole monitoring has always been a technical problem that plagues the automatic processing of small hole machines

[0011] The above problems have not been effectively solved for many years

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