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I. Understanding the Basic Principles of Wire EDM Multi-Step Cutting Mode

"Wire EDM multi-step cutting mode" refers to a process of performing roughing and fine finishing two or more times on the same machining path in stages. Initially, a larger current and faster speed are used for roughing to quickly remove most of the material; then, a smaller current and slower speed are used for fine finishing to ensure smooth, burr-free edges. The core of this step-by-step strategy is the rational allocation of energy input to avoid excessive wear on the molybdenum wire in a single process.

II. Roughing Stage: Efficient Material Removal, Reduced Burden

In the roughing stage, by increasing the discharge gap and pulse width, a large amount of metal material can be quickly stripped away, and the pressure on the molybdenum wire is relatively small. Since the main task is rapid forming rather than pursuing extreme precision, the wire feed speed can be appropriately increased to reduce the direct impact of a single discharge on the molybdenum wire. This ensures production efficiency while reducing molybdenum wire wear caused by prolonged high-intensity work, laying a good foundation for subsequent fine finishing.

III. Finishing Stage: Refined Processing, Extended Lifespan

Upon entering the finishing stage, parameters are adjusted to a low-energy mode, reducing the discharge energy density and allowing the molybdenum wire to complete surface finishing under gentler conditions. The key to this stage is controlling discharge stability to avoid unnecessary spark jumps, thereby reducing the risk of molybdenum wire breakage. Simultaneously, the tiny debris generated during finishing is more easily carried away by the working fluid, reducing additional frictional damage caused by their adhesion to the molybdenum wire, further protecting its integrity and durability.

IV. Optimizing Process Parameters for Optimal Synergistic Effect

To fully leverage the advantages of "wire EDM multi-cutting mode (roughing/finishing)," various process parameters need to be flexibly adjusted based on specific material characteristics, workpiece thickness, and shape complexity. For example, for difficult-to-machine materials such as cemented carbide, the peak current during roughing can be appropriately increased to accelerate material removal; while for thin-walled parts, greater emphasis should be placed on stability control during finishing to prevent deformation from affecting accuracy. By precisely matching the cutting parameters at different stages, a perfect transition between roughing and finishing can be achieved, maximizing the lifespan of the molybdenum wire.