Wire-feed twin-wire exchange wire feeding system in WEDM (wire cut electrical discharge machining)

Abstract

The invention discloses a wire-feed twin-wire exchange wire feeding system in WEDM (wire cut electrical discharge machining). The system comprises a high-speed reciprocating wire feeding system; the high-speed reciprocating wire feeding system comprises a wire winding cylinder; a high-speed wire electrode wound on the wire winding cylinder sequentially passes through a tension mechanism, a first wire moving wheel, an upper wire frame main guide wheel and a lower wire frame main guide wheel, and finally is wound back to the wire winding cylinder; a workpiece processing area is arranged between the upper and lower wire frame main guide wheels; the system also comprises a low-speed one-way wire feeding system; the low-speed and high-speed reciprocating wire feeding systems share the first wire moving wheel, the upper wire frame main guide wheel and the lower wire frame main guide wheel; the low-speed one-way wire feeding system comprises a low-speed wire winding and feeding mechanism; a low-speed wire electrode wound on the low-speed wire winding and feeding mechanism sequentially passes through a second wire moving wheel, the first wire moving wheel, the upper and lower wire frame main guide wheels and a low-speed wire rolling and feeding mechanism and then is discharged; and the low-speed wire rolling and feeding mechanism is used for drawing the low-speed wire electrode. In the invention, through the exchange of molybdenum wires and brass wires, relatively high precision is obtained at low cost, and a relatively high processing requirement for the surface roughness is met.

Description

technical field [0001] The invention relates to a wire-feeding system for electric discharge wire cutting. Background technique [0002] The existing WEDM wire feeding system includes a wire reel, on which the cutting electrode wire (molybdenum wire) wound sequentially passes through the tension mechanism, the first wire passing wheel, the upper wire frame capstan wheel, and the workpiece EDM area. And the capstan wheel of the unloading frame, and finally rewind to the winding drum. When working, the winding drum is driven by the wire transport motor to rotate, and the electrode wire moves at a high speed of 7-11 m / s. It is completed with the motion control of the control system and high-frequency discharge. Electric discharge cutting of the workpiece. When the wire reel moves to one end and presses the travel reversing switch, the wire reel rotates in the opposite direction and moves axially in the opposite direction, driving the wire electrode to move in reverse to perfor...

AI Technical Summary

Problems solved by technology

The change in the direction of movement causes the inaccurate positioning of the molybdenum wire in the V-shaped groove of the guide wheel, which is also one of the reasons for the water ripple on the cutting surface.

Therefore, the current fast wire-feeding includes the newly-emerged medium-feeding wire-feeding in recent years (the medium-feeding wire is the addition of slow-moving wire-cutting, one-repair, two-repair and three-repair functions to the original fast-feeding wire-feeding machine tool). A Bottleneck Problem in the Development of Machine Tools

Images