Modern mold factories cannot lack electrical machining, which can process various irregular and high hardness parts. It is divided into two types: wire cutting and electrical discharge.
(1) Wire cutting processing
It is processed on a single piece of material, which disrupts the original stress balance of the workpiece and easily causes stress concentration, especially at corners. Therefore, when R<0.2 (especially sharp corners), improvement suggestions should be proposed to the design department. The method for dealing with stress concentration during processing can use the principle of vector translation. Before precision machining, a margin of about 1mm is left, and the rough shape is pre processed before heat treatment to release the processing stress before precision machining, ensuring thermal stability.
For example, slow wire cutting can achieve an accuracy of ± 0.003mm and a roughness of Ra=0.2 μ M. At the beginning of processing, the condition of the machine tool should be checked first, including the deionization degree of water, water temperature, verticality of the thread, tension, and other factors, to ensure a good processing state.
(2) Electrical discharge machining
First, you need to make electrodes, which can be coarse or fine. Precision machining of electrodes requires good shape compliance, and it is best to use CNC machine tools to complete the machining. In terms of material selection for electrodes, copper electrodes are mainly used for general steel processing; Cu-W alloy electrodes have good comprehensive performance, especially in the processing where the consumption is significantly lower than that of copper. Combined with sufficient flushing fluid, they are very suitable for precision machining of difficult to machine materials and complex cross-sectional shapes; Ag-W alloy electrodes have better performance than Cu-W alloy electrodes, but they are expensive, have fewer resources, and are generally less commonly used.
When making electrodes, it is necessary to calculate the gap and number of electrodes. When conducting large-scale or heavy electrode machining, the workpiece and electrode clamps should be firm to ensure sufficient strength and prevent loosening during machining. When performing deep step machining, attention should be paid to the loss of electrodes and arc discharge caused by poor liquid discharge.
Post time: 2024-05-07 11:52:28
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