JPH0425093B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire-cut electric discharge machining apparatus or an electrode unit thereof.

In a conventional wire-cut electrical discharge machining device, the wire electrode supply path is from a supply drum provided in the column or front side wall of the device to one of two arms connected to the column, or from the feed drum provided on the front side wall of the device. It extends along the front end of the column, extends from there to the tip of the other arm, and extends from the tip of the column along the other arm, as in the case of the one arm described above, to the column. Then, it reaches a winding drum installed in parallel with the supply drum and is wound up.

However, with wire-cut electrical discharge machining equipment having such a supply path, it is difficult to process the contours of parts such as the top of a character-shaped member, the hollow part of an extrusion die, or the cutting edge part of a trim die. It was inconvenient.

In order to solve this problem, the applicant of the present application disclosed the contour shape of the top part of the above-mentioned letter-shaped member, the hollow part of the extrusion die, and the cutting edge part of the trim die in Japanese Patent Application Laid-open No. 129400/1983. A wire cut electrical discharge machining device and an electrode unit thereof have been disclosed.

However, although the wire-cut electric discharge machining apparatus and its electrode unit disclosed above can process parts such as the top of a character-shaped member, the hollow part of an extrusion die, and the contour shape of the cutting edge part of a trim die, they cannot process a taper. Although it is possible to process parts or slopes using the methods and devices disclosed in, for example, JP-A-54-5294 and JP-A-54-5193, there are problems such as complicated control. It was hot.

The present invention has been made based on the above-mentioned viewpoints, and its purpose is not only to be able to process the outer peripheral contour shape of a portion such as the top of a letter-shaped member, but also to The object of the present invention is to provide a wire-cut electrical discharge machining device or an electrode unit which can be applied to a very wide range of applications and can relatively easily process tapered portions and slopes.

Therefore, the object of the present invention is to configure the wire electrode so that after being unwound from one arm, the wire electrode is returned to the inside of the arm through an electrode path including one turning point, and A guide holder provided with an electrode guide stretched facing the workpiece is pivotally supported on a support arm, and the guide holder is connected to a wire electrode guided by the electrode guide provided on the guide holder. This is achieved by configuring it so that it can rotate within a plane that includes the path.

Hereinafter, the details of the present invention will be specifically explained with reference to the drawings.

The drawing is an explanatory view showing one embodiment of a wire cut electric discharge machining apparatus according to the present invention.

1 is a housing in which a wire electrode supply drum 2, a wire electrode winding drum 3, a brake roller 4 and a pinch roller 5 paired with this, a capstan 6 and a pinch roller 7 paired with this are respectively provided; 9 is a wire electrode, 9 is a supporting arm screwed onto the housing 1, 10, 10 is a bearing fixed around the supporting arm 9, 11 is a bevel gear fixed around the supporting arm 9, 12 is an arm, 13 is a motor, 14 is a shaft of the motor 13, and 15 is a shaft 14.
16, 16 are bearings, 17 and 18 are guide rollers, 19 is a guide holder, 20 is a gear attached to the guide holder 19, 2
1 is a shaft that pivots the guide holder 19; 22 is a motor; 23 is a gear 2 attached to the motor 22 and to the guide holder 19;
Gears 24, 24 and 25 meshing with 0,
25 is a guide that is attached to the guide holder 19 and is provided with guide grooves 24a, 24a and 25a, 25 for the electrodes 8; 26 is the guide holder 1;
A guide roller attached to the lower end of 9, 27 is a workpiece, 27a is an overhang part of the workpiece 27, 28 is an X-Y cross slide table,
Reference numeral 29 indicates a bed, and reference numerals 17' and 18' prevent the front and rear wire electrodes 8 of the holder 19 from coming into contact with the holder 19, the gear 20, or the housing 9 by swinging the head around the axis 21 of the holder 19. The clamp guide rollers 30 and 31 provided on the casing 9 side are clamp guide rollers provided on the holder 19 side for the same purpose.

Note that the arm 12 extends from a column (not shown) that is provided upright on or on the side of the bed 29 on the front or back side of the drawing, or on the left or right end side, onto the cross-sliding table 28, or further on the surface of the table 28. On the other hand, it is provided so that it can be moved up and down in close proximity and separation.

The wire electrode 8 in this electrode unit is stretched from the wire electrode supply drum 2 provided in the casing 1 above the arm 12 to between the brake roller 4 and the pinch roller 5. , passes through the inside of the support arm 9 , passes through the guide roller provided on the support arm 9 , passes through the guide grooves 24 a, 24 a of the guide guides 24 , 24 attached to the guide holder 19 , and the guide roller 26 . successively reached,
Here the direction is changed and another guide 25,
1 guide roller from 25 guide grooves 25a, 25a.
8, passes through the support arm 9, returns to the inside of the housing 1,
The wire is configured to pass between the capstan 6 and the pinch roller 7, reach the wire electrode winding drum 3, and be wound there.

Also, a bevel gear 11 is attached to the support arm 9 of the electrode unit.
is attached, and this bevel gear 11 is attached to the shaft 14 of the motor 13 provided in the arm 12.
The electrode unit rotates with respect to the arm 12 as the motor 13 rotates.

Furthermore, a gear 20 is attached to the guide holder 19 and is pivotally supported by a shaft 21 . Since the gear 20 and the gear 23 attached to the shaft of the motor 22 mesh with each other, the guide holder rotates about the shaft 21 as the motor 22 rotates.

Therefore, if the motor 13 is rotated, the arm 1
The electrode unit rotates with respect to 2, and by rotating the motor 22, the guide holder can be rotated at a desired angle around the shaft 21. This makes it possible to process contours.

That is, the overhang portion 27a of the workpiece 27
The processing with the above device by numerical control of the outer peripheral contour of the X-Y cross slide table 28,
The workpiece 27 is moved in a plane by applying controlled feed to each Y axis to draw a locus of a desired outer peripheral contour of the overhang portion 27a. On the other hand, if the desired shape of the outer peripheral contour of the overhang portion 27a is, for example, a perfect circle, the center of the circle, the shaft of the wire electrode 8 and the gear 11 in the portion guided by the guide 24 Therefore, the cross slide table 28 rotates the support arm 9 substantially continuously according to the numerically controlled machining feed of the circular arc trajectory so that the rotation center axis of the rotating support arm 9 is preferably always on a straight line in the above order. It moves me. Further, the shape of the workpiece 27 is square or rectangular, and the workpiece 27 is arranged so that the two axes of the rectangle coincide with the two axes of the cross slide table 28.
is placed, one of the above squares
From the starting end to the end of the shaft side surface, preferably, the line connecting the axis of the wire electrode 8 and the rotation center axis of the support arm 9 is perpendicular to the one X-axis side surface.
The machining progresses to the end of the above-mentioned one side without rotating, and when the machining moves to the next Y-axis side whose angle is different by π/2, the feeding of each of the X and Y axes is appropriately stopped, etc. Then, the support arm 9 is rotated at an angle of about π/2 so that the line connecting the axis of the wire electrode 8 and the rotation center axis of the support arm 9 is perpendicular to the Y-axis side surface where the processing is to be started. It is.

Furthermore, when the portion of the workpiece 27 to be machined is tapered or sloped, the guide holder 19
When the guide holder 19 reaches a desired angle, the motor 22 is stopped, and thereafter, machining is performed while maintaining the angle.

Note that rotation control signals are input to each of the motors 13 and 22 from a numerical control device (not shown) that inputs numerical control signals to each axis of the cross slide table 28.

Since the present invention is constructed as described above, according to the present invention, overhanging parts that could not be machined with conventional wire-cut electric discharge machining equipment, such as the hollow part of an extrusion die and the cutting edge part of a trim die, can be removed. Needless to say, since machining of tapered portions, slopes, etc. can be performed with relatively simple operation control, it is possible to provide a wire cut electric discharge machining device that can be used in an extremely wide range of applications.

Note that the present invention is not limited to the embodiments described above. That is, for example, in this example,
Although guides were provided on both sides of the guide holder,
This may be provided on only one side. Other methods of rotating the support arm and guide holder,
The shape etc. can be freely changed within the scope of the purpose of the present invention, and the present invention encompasses all of them.

[Brief explanation of drawings]

The drawing is an explanatory view showing one embodiment of a wire cut electric discharge machining apparatus according to the present invention. 1... Housing, 2... Wire electrode supply drum, 3
... Wire electrode winding drum, 4 ... Brake roller, 5, 7 ... Pinch roller, 6 ... Capstan, 8 ... Wire electrode, 9 ... Support arm, 12 ...
Arm, 13...Motor, 16...Bearing,
17, 18... Guide roller, 19... Guide holder, 24, 25... Guide guide, 26... Guide holder, 27... Workpiece.

Claims (1)

[Claims] 1. A machine base, a column standing up on the side of the machine base, a table provided on the machine base, and an arm 12 supported so as to extend from the column onto the surface of the processing table; A support arm 9 rotatably attached to the arm 12, a mechanism for rotating the support arm 9 around its central axis, a guide holder 19 connected to the support arm 9, and a wire electrode provided on the guide holder 19. At least one pair of electrode guides 2 forming a guide path and forming a wire cut portion on the path
4, 25, and at least one pair of electrode guides 24,
In the wire-cut electrical discharge machining apparatus equipped with a device for supplying a wire electrode to an electrode path formed by The support arm 9 is supported by a pivot shaft 21 provided perpendicular to the electrode path plane, and a drive device for rotating the guide holder 19 about the pivot shaft 21 is provided, and the drive device is controlled by a central controller. The wire cut electric discharge machining apparatus described above is configured as follows.