JPS6254607B2 - - Google Patents

Description

[Detailed description of the invention] The present invention forms a chevron-shaped protrusion on the die of a precision cutting die or the plate holder on the punch side, and
The present invention relates to a surface cut electrical discharge machining device that performs similar machining.

BACKGROUND ART Conventionally, it has become possible to extremely easily manufacture dies and punches having cutting lines having complicated shapes by wire-cut electrical discharge machining.
In the process of press working using this die and punch, tension is applied to the free surface of the material near the edge angle of the punch when it is pushed by the punch, causing it to bend and form a part called a droop. In order to prevent this, a chevron-shaped protrusion, commonly called a ring tooth, is provided on the plate holder on the die and punch side, and this is inserted into the material to hold the material. The height of the chevron-shaped protrusion provided for this purpose is 0.1 to 1 mm,
Most of the surface of the die plate holder is occupied by flat parts. When forming this flat part and the chevron-shaped protrusion, the most important consideration must be given to the position where the chevron-shaped protrusion is provided and the distance from the cutting line. Along the cutting line having the shape of , a chevron-shaped protrusion is formed at a certain distance from the end of the cutting line. For this formation, the conventional electrical discharge machining apparatus uses a fully shaped electrode machined into the desired shape, and the entire plane portion is dissolved and removed by electrical discharge. Therefore, there was a drawback that an electrode had to be specially made in order to process the chevron-shaped protrusion. Furthermore, the purpose of this device is to process the contour shape of the side surface of the top of an I-shaped member with a bottom by using a wire electrode. Japanese Unexamined Patent Publication No. 129400/1983 discloses a method in which electrical discharge machining is performed by placing a linear portion of a linearly guided wire electrode facing a workpiece. In this apparatus, since the workpiece has a bottom and the bottom part is not processed, the wire electrode is made to make a U-turn using one guide roller attached to the lower end of the support arm. However, with this device, it was not possible to continuously process the flat surface of the die or plate holder and the chevron-shaped protrusions on the flat surface.

The present invention eliminates the above-mentioned drawbacks and provides a convenient device that can be used to process and form chevron-shaped protrusions called ring teeth and flat surfaces on workpieces such as dies and punch side plate holders. It was done for a purpose. Therefore, in order to form a chevron-shaped protrusion and a flat surface on the surface of a workpiece such as a die or a plate holder on the punch side, there is a wire electrode guide that guides the wire electrode upward from a horizontal direction through a curved surface. A processing electrode has a wire electrode that moves with a required tension guided by a guide, and is driven and controlled in the axial direction and rotational direction of the Z-axis, and a processing electrode that is placed on a horizontal plane orthogonal to the vertical Z-axis. A processing power source that supplies processing pulses to a workpiece such as a die or a plate holder attached to the processing table and to a wire electrode; It is equipped with an NC device (numerical control device) that drives and controls the processing electrode and the processing table, and the vertical surface containing the wire electrode guided upward from the horizontal surface through the curved surface is shaped like a chevron by the signals emitted from this NC device. The processing electrode is controlled so as to be perpendicular to the contour line of the protrusion, and a flat portion and the contour of the protrusion having a chevron-shaped cross section are formed on the surface of the workpiece.

The present invention will be explained below with reference to an embodiment of the drawings.
1 is a wire electrode made of copper, brass, or the like. This electrode 1
The cross section of the cross section is not limited to a circular one, but a flat belt-like cross section can also be used. A pair of guides 2 guide the wire electrode 1 from a horizontal position to a desired shape, such as forming a chevron-shaped curved surface, and are provided at the tip of the support member 3 so that the fixed gap therebetween can be adjusted to some extent. The wire electrode 1 is supplied from a drum 4, stretched horizontally between a pair of guides 2, guided by a predetermined curved surface on both sides, moved through a vertical plane, and wound onto another drum 5. 6 is a capstan for winding and moving the wire electrode 1; 7 is a brake roller;
Both allow the wire electrode 1 to move between the pair of guides 2 with a required tension.
Reference numeral 10 denotes a machining electrode composed of the wire electrode 1, guide 2, etc. as described above, and for machining, it has a curved surface forming a chevron shape with the horizontal of the wire electrode 1 guided between a pair of guides 2. 11 is a motor that feeds the machining electrode 10 in the Z-axis direction; 12 is a rotary motor that rotates the processing electrode 10 around the Z axis; 14 is a workpiece 1;
15 is a motor that sends the processing table 14 to the X-axis perpendicular to the Z-axis and the Y-axis; 16 is the motor that moves the table 1 to the Y-axis perpendicular to the Z-axis and the X-axis.
4, both of which are driven and controlled by signals from the NC control device 17. 18 is a processing power source that supplies processing pulses between the wire electrode 1 and the workpiece 13.

In electrical discharge machining, the surface of the workpiece 13 is cut using the contour shape and dimensions of the wire electrode 1 guided by the guide 2. Electric discharge is generated in the entire area where the wire electrode 1 faces the workpiece 13, and the wire electrode 1 is machined by following the contour shape of the guarded wire electrode 1.
At that time, drive the motor 11 to move the processing electrode 10 to Z.
After feeding the workpiece 13 to the shaft and making the required cut into the workpiece 13, the rotary motor 12 is rotated by NC so that the vertical plane containing the wire electrode 1 guided by the guide 2 is perpendicular to the chevron outline shown in FIG. The surface of the workpiece 13 is cut by controlling the device 17 to scan and feed the workpiece 13 having a plane perpendicular to the Z axis. This scanning feed is carried out by the X and Y axis motors 15 and 16.
This is performed by operating the NC control device 17 to control the movement of the processing table 14 and to move the workpiece 13. Reference numeral 13a denotes a ring tooth portion consisting of a chevron-shaped protrusion with an apex angle of approximately 80°, which is machined by cutting the surface of the workpiece 13 in this manner. Protrusions 13a can be formed. At this time, it is necessary to control so that the vertical plane including the outline of the guided wire electrode 1 is always directed in the processing direction perpendicular to the chevron-shaped protrusion 13a in response to the scanning shape feed. As mentioned above, it is necessary to control and drive the processing table 14 by driving the motors 15 and 16 and to rotate the processing electrode 10 by driving the rotary motor 12. All are program-controlled by the NC control device 17.

Figure 2 shows the workpiece 1 cut by the aforementioned surface cut.
This is a top view showing a chevron-shaped protrusion 13 formed in a desired outline shape on the surface of 3a, which is suitable for processing ring teeth of a plate holder provided outside a shaping die, precision cutting die, or punch, for example. By forming a chevron-shaped protrusion as shown in the figure on this die or punch, it is possible to punch the plate without causing breakage. Machining can be performed extremely easily using a surface cut electric discharge machining device.

As described above, by guiding the wire electrode into a desired shape and processing using the guided contour, a chevron-shaped protrusion with an arbitrary shape and a complicated contour can be easily obtained. It is configured so that it is supplied from a drum, moves between guides, and is wound up on another drum, and new parts are constantly fed and moved between the guides, so it is possible to create the required contour shape as in the case of electrical discharge machining using a full-form electrode. There is no deformation due to wear and tear, and the surface of the workpiece is scanned into the desired shape and cut by scraping, making it extremely suitable for embossing, engraving, engraving, etc. on the surface of chevron-shaped protrusions. It has the effect of being efficient.

In particular, it is extremely effective for forming protrusions such as ring teeth in shaping dies and precision cutting dies, and can be processed at high speed.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention, and FIG. 2 is a top view of a processed object. 1... Wire electrode, 2... Guide, 4, 5...
Drum, 6...Kabstan, 7...Brake,
10...Processing electrode, 11...Z-axis feed motor,
12... Rotating motor, 13... Workpiece, 13a
...Chevron-shaped protrusion (ring tooth), 14...Processing table, 15, 16...X and Y axis drive motor, 17...
...NC control device, 18...Power supply for processing.

Claims (1)

[Claims] 1. A workpiece such as a plate holder on the die or punch side, and a wire electrode that guides the wire electrode upward from horizontally through a curved surface in order to form a chevron-shaped protrusion and a flat surface on the surface of the workpiece. A processing electrode has a guide and a wire electrode that moves with a required tension guided by the guide, and is driven and controlled in the axial direction and rotational direction of the Z axis, and an , a machining table that controls drive in the Y-axis direction, a machining power supply that supplies machining pulses to the workpiece and wire electrode attached to the machining table, and an NC that drives and controls the machining electrode and the machining table. A surface cutting electrical discharge machining device that processes and forms a flat portion and the outline of a protrusion having a chevron-shaped cross section on the surface of a workpiece according to signals from the NC device.