Generally, when machining high-precision parts, the slow wire cutting machine is widely used. This equipment has many varieties, and the operation of each machine tool is much the same. Although some basic operation contents and requirements are similar to those of the fast wire EDM machine tool, the workpiece processing performance of the slow wire EDM machine is much better than that of the fast wire EDM machine. Founded in 2002, Kaifu Company can undertake various kinds of precision CNC processing, small batch processing of aluminum alloy, batch processing of aluminum alloy, CNC production of aluminum alloy parts, aluminum machining, robot metal parts processing. Kaifu Company has more than ten years of rich experience in aluminum alloy CNC precision machining and manufacturing industry. The company has high-precision CNC milling, high-precision CNC lathe, CNC fine carving, sheet metal processing, wire cutting, spark discharge, laser rapid prototyping and vacuum copying and other equipment, an exquisite professional technical team, and a perfect production process and quality control system. Next, Kaifu will introduce the process preparation for the operation of the wire cutting slow threading machine.
1. Technical performance analysis of workpiece materials
Different workpiece materials, due to their different melting points and gasification points, cannot be processed in the same way, or products with unsatisfactory quality will be obtained. Therefore, it must be selected according to the actual surface quality. To achieve high precision, it is necessary to select hard alloy materials, not stainless steel or quenched high carbon steel, otherwise it cannot meet the requirements.
2. Selection of working fluid
Spark discharge needs to be carried out in a liquid medium with a certain insulating property. The insulating property of the working fluid can allow the discharge point channel after breakdown to be compressed, so as to limit the spark discharge point to a small channel radius, forming instantaneous and local high temperature, so that the metal that has not been gasified can be melted. After the discharge, the discharge gap can be quickly restored to an insulating state. The insulation property is too low to generate electrolysis without forming breakdown spark discharge point; The insulation is too high, the discharge gap is small, the chip removal is difficult, and the speed will be reduced.
3. Selection and Correction of Electrode Wire
The electrode wire of slow wire EDM is usually made of brass wire, copper wire, brass plus aluminum, brass plus zinc, etc. For static dense wire EDM, molybdenum wire or tungsten wire can also be used to increase the tension of electrode wire as much as possible under the premise of continuous wire.
4. Processing of threading holes
In the actual production and processing, in order to prevent the internal part of the workpiece from participating in the stress deformation and the thermal stress deformation caused by the discharge, both the closed workpieces of the female die type and the punch type workpieces should be processed at the appropriate position first. The threading hole with a certain diameter of the wire cutting slow threading machine tool shall be closed cut to avoid open cutting.
5. Clamping and alignment of workpieces
For the workpiece to be processed by the slow wire EDM machine tool, the reference plane shall be determined in the previous processing, and the workpiece can be clamped and aligned correctly on the slow wire EDM machine tool. It is necessary to make full use of machine tool accessories to clamp workpieces. For the clamping of some workpieces with complex structure and easy deformation, special fixtures can be designed and manufactured when necessary.