Coarse and precision composite processing method suitable for numerical control electrospark wire-electrode cutting

Abstract

The invention discloses a coarse, middle and fine composite processing method which is applicable to numerical control electrical discharge wire cutting, the composite processing method sets the specification standards of the coarse processing, the middle processing and the fine processing according to parameters of output pulse voltage and current of a pulse power supply; then the contrast of the gap differences is carried out by the current single side discharge gap Delta gap, the coarse processing gap Delta 1, the middle processing gap Delta 2 and the fine processing gap Delta 3 which are detected by a servo control system, thus obtaining the states of the coarse processing, the middle processing and the fine processing. The output parameters of the pulse power supply are automatically circulated and changed in the specification standards of the coarse processing, the middle processing and the fine processing throughout the processing process, thus realizing the purpose of one-step forming composite processing of the coarse processing, the middle processing and the fine processing.

Description

Technical field [0001] The present invention relates to a processing method for a workpiece, and more particularly, to a rough, medium and fine composite processing method suitable for numerical control electric discharge wire cutting, which belongs to the B23H category in the IPC classification. Background technique [0002] Wire cut Electrical Dischatge Machining (WEDM), sometimes called WEDM, its basic working principle is to use a continuously moving metal wire (called electrode wire) as an electrode to perform pulse spark discharge erosion on the workpiece Metal, cutting and forming. [0003] Different from traditional cutting methods, wire EDM is a machining method that uses the electro-corrosion phenomenon generated by the pulse discharge between the tool electrode and the two poles of the workpiece (the pulse power supply provides voltage and current) to size the workpiece. Practical WEDM processing should generally have the following requirements: [0004] (1) It is nece...

AI Technical Summary

Problems solved by technology

[0008] At present, whether it is fast wire cutting or slow wire cutting processing and pulse power supply, the common disadvantages are: (1) When dividing multiple times of rough, medium and fine cutting, the operator needs to write the cutting trajectory program many times, and calculate its unit. It is more cumbersome to cut the amount while cutting and assist in the processing of the material core; (2) When cutting multiple times, whether it is fast wire or slow wire, the electrode wire is sparked on one side, which will cause jitter and affect the quality of intermediate processing and finishing. Processing speed, as well as surface quality and processing accuracy

[0009] see figure 1 Shown is a schematic diagram of the unilateral discharge gap during multiple cuts in the existing wire-cut electric discharge machining. In the figure, δ 1 ,δ 2 ,δ 3 They are the side unilateral discharge gap (the gap between the wire electrode 2 and the processing track 3) during rough machining, intermediate machining, and finishing machining. The wire electrode 2 will inevitably vibrate on the workpiece 1, reducing the cutting speed and machining Precision and Surface Quality

Images