What is the basic working principle of wire cutting machining?

What is the basic working principle of wire cutting machining?

The basic working principle of wire cutting is to use continuously moving fine metal wires (called wire cutting electrode wires) as electrodes to perform pulse spark discharge on the workpiece to remove metal and cut it into shape. Wire cutting is mainly used for processing various complex and precise small workpieces. For example, wire cutting can process punch heads, concave and convex molds, fixed plates, demoulders, etc. of the material cutting die. Can process various micropores, narrow slits, any curve, etc. Wire cutting has many incomparable advantages, such as small machining allowance, high machining accuracy, short production cycle, and low manufacturing cost. Wire cutting has been widely used in production.

The wire cutting machine tool must operate normally and meet the following conditions:

1. Maintain a certain gap between the molybdenum wire and the workpiece processing surface. The width of the gap is determined by processing conditions such as working voltage and processing volume.

2. When machining with wire cutting machines, it is carried out in liquid media with certain insulation properties, such as kerosene, saponified oil, deionized water, etc. The requirement for high insulation is to facilitate the generation of pulse spark discharge, and the liquid medium also has the function of removing galvanic corrosion products in the gap and cooling the electrode. Maintain a certain gap between the molybdenum wire and the surface to be processed. The gap is too large, and the voltage between the electrodes cannot penetrate the dielectric between the electrodes, resulting in no spark discharge; If the gap is too small, it is easy to form a short circuit connection and cannot generate discharge. Spark discharge.

3. Using a pulse power supply, i.e. spark discharge is both pulsed and intermittent. During the pulse interval, the gap medium is deionized so that the next pulse can break through and discharge between the two poles.

Wire cutting generally refers to electrical discharge wire cutting. The basic working principle is to use continuously moving fine metal wires (called electrode wires) as electrodes to perform pulse spark discharge on the workpiece to remove metal and cut it into shape. There are many reasons that affect wire cutting processing, and various reasons are interrelated and contradictory. We can improve the processing speed by increasing the peak current, but this will reduce the surface roughness of the workpiece, so we should fully consider the problem during the processing.

1: Molybdenum wire is subjected to different forces in two directions during cutting. If it is a machine tool that manually tightens the wire, it will test the master's experience. If it is a centerline with automatic wire collection, let the molybdenum wire run for a period of time before cutting.

2: The guide wheel of wire cutting processing is damaged, causing uneven bi-directional force on the wire. It is also possible that there is a quality issue with the guide wheel itself.

3: If it is a self-assembled guide wheel, it is necessary to check whether the bearing is installed improperly. The bearing should be purchased at level D or above.