JPS6389226A - Machining system for molded electrode in use for electric discharge machining - Google Patents

Abstract

PURPOSE:To perform the precision machining of a molded electrode, by attaching a die, having a datum level in orthogonal three directions serving as a positional reference at the time of molding, to an electrode blank forming the molded electrode, and installing a datum clamp face of the reference die, in a holder of an electrode forming machine. CONSTITUTION:First, an electrode blank 20 in a form corresponding to the requisite electrode form and an L-type reference die 10A or an I-type reference die 10B conformed to this electrode blank are selected, and the reference die 10 is locked with a screw. next, the electrode blank 20 with this reference die 10 is held by a holder for an electrode forming jig 40, and wire-cut electro- discharge machining takes place. According to the above system, complex three- dimensional forms are giveable to a molded electrode so that necessity for compound machining is reducible. In this connection, when electric discharge machining is carried out by the molded electrode, the reference die 10 is usable as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a processing system for a shaped electrode for electrical discharge machining.

"Prior art and its problems" Electrical discharge machines have an excellent processing feature of being able to transfer the shape of a molded electrode to a workpiece as is, and are useful for manufacturing two starting molds such as injection molds. It is widely used. Generally, a shaped electrode is produced by processing an electrode blank into a desired shape using an electrode forming machine such as a wire-cut electric discharge machine or a machining machine such as a cutting machine. By the way, if the mold to be manufactured is simple, processing is possible with a single molded electrode, but if the mold to be manufactured becomes complex, processing cannot be performed with a single molded electrode, and multiple molded electrodes may be used. Composite processing using this method is essential. Generally speaking, the number of molded electric fences for complex processing can be reduced if the molded electrode can be processed into a complex three-dimensional shape, but if it can only be processed into a simple shape, the number increases and its management becomes difficult. It becomes difficult.

However, in the conventional processing of formed electrodes, the six sides of a rectangular parallelepiped electrode blank are polished, and these reference surfaces are used to attach the electrode blank to an electrode forming machine such as a wire-cut electrical discharge machine. Met. When processing an electrode blank in two-dimensional or three-dimensional directions, attach the electrode blank to the molding machine using another reference surface and perform the same processing.However, two-dimensional or three-dimensional processing is performed in this way. In conventional apparatuses, each time the machining direction is changed, parallelism with the machined surface, perpendicularity, centering, etc. must be adjusted, and the adjustment work is very complicated. For this reason, with conventional electrode forming machines, it is impossible to obtain molded electrodes with complex three-dimensional shapes, and it is necessary to perform complex processing using a large number of molded electrodes with very simple shapes. However, such an increase in the number of shaped electrodes increases the complexity of adjustment work in the electrical discharge machine, making it difficult to manage a large number of shaped electrodes.

``Object of the Invention'' An object of the present invention is to propose a new system that can solve the problems in the conventional processing system for forming electrodes for electrical discharge machining at once.

"Summary of the Invention" The present invention departs from the conventional idea of providing (processing) some kind of reference surface on the electrode blank itself, and instead provides the electrode blank with reference surfaces in three orthogonal directions made of a separate member. This was completed based on the idea of attaching a reference piece having a shape and using this reference piece as a reference surface when attaching an electrode blank to an electrode forming machine. The simplest reference piece is a block-shaped reference piece that has three orthogonal reference planes, and in electrode forming machines such as wire-cut electric discharge machines, there is a block-shaped reference piece that engages with the three orthogonal reference planes of this reference piece. A holder having a reference groove for holding the reference piece at predetermined positions in three orthogonal directions is provided.

According to this system, since the positions in three orthogonal directions are strictly determined by the reference piece, it is possible to easily perform complex three-dimensional processing on the electrode blank itself. Therefore, there is no need for any adjustment work when changing the set for changing the processing direction in the electrode forming machine, that is, adjustment work such as parallelism setting, squareness setting, centering work, etc.

The reference piece may be formed in a block shape or in a V-shape, and in this case, the holder is preferably formed with a reference groove that defines a reference surface that engages with the V-shaped base i piece.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. Figure 1 (A
) and (8) show examples of shapes of the reference piece 10 according to the present invention and the electrode blank 20 attached thereto. Twenty electrode blanks, usually several types of rectangular parallelepiped blocks, are prepared depending on the expected shape of the molded electrode. Further, the reference piece] 0 is either an L-shaped reference piece 10A or a ■-shaped reference piece 10B, depending on the part to be processed on the electrode blank 20. These L-shaped reference pieces 10A and engineering model reference pieces 10B each have a reference insertion/removal portion 13 having a protruding half face X, a horizontal restriction face y of width p, and a vertical restriction face 2 of width S at one end thereof. I am prepared. The rigid surfaces X, y, and z of the reference insertion/removal portion 13 are three and a half surfaces that are orthogonal to each other, and their flatness, parallelism, perpendicularity, and widths β and S (particularly the width S) are specified. The dimensions are precisely machined using a block gauge level.

This reference insertion/removal portion 13 is provided with a fixing bolt insertion hole 4 for fixing the reference piece 10 to the holder. This fixing bolt insertion hole 14 is provided so that there is some clearance between it and the fixing bolt.

And this L-type reference piece 10A;! 3 and mold reference piece 10
B has a blank fixing part 15, and mounting holes 16 for the electrode blanks 20 are formed in each of the blank fixing parts 15. This attachment hole 16 may be either a threaded hole or a through hole as long as it can fix the electrode blank 20 to the fixing part 15 and its position does not change after fixation, and does not require precision.

The electrode blank 20 is formed with a screw hole into which a fixing screw inserted into the attachment hole 16 is screwed.

On the other hand, the L type reference piece 10A and the engineering type reference piece 10B
In this embodiment, the holder 30 of the electrode forming machine that supports the is used as an electrode forming jig 4o of a wire-cut electric discharge machine shown in FIG. The holder 30 is formed by forming two reference grooves 32, 33, and 34 in a rectangular parallelepiped block 31 into which the reference insertion/removal portion 13 of the reference piece 10 is inserted and removed. Among these three grooves, the reference grooves 32 and 33 are orthogonal cross grooves formed on one surface of the rectangular parallelepiped block 31, and the other one is a cross groove that is perpendicular to the surface on which these reference grooves 32 and 33 are formed. This is a groove parallel to the reference groove 32 that was formed. These reference grooves 32, 33, and 34 serve as reference surfaces that engage with each reference surface of the reference insertion/removal portion 13, and the flatness and perpendicularity of each bottom surface are machined at the starting end, and The width should be exactly the same as the width S of the reference insertion/removal part 13 of the reference piece 10 (fit without any gap)! Processed.

In addition, the flatness of the vertical plane of the rectangular parallelepiped block 31,
The perpendicularity and the inter-plane distance ML, which is precisely machined, corresponds to the width β of the reference insertion/removal portion 13 of the reference piece 10.

This rectangular parallelepiped pro-nk 31 has a reference groove 32.3.
A screw hole 35 corresponding to the fixing bolt insertion hole 14 of the reference piece 10 is bored in correspondence with the groove of 3.34, and the outer surface of the rectangular parallelepiped block 31 has a reference groove 32.33.
A regulating piece 36 for firing the material at one end of 34 is fixed.

- Electrode forming jig 40 for wire cut electric discharge machine
' is a device in which a guide rail 42 that is orthogonal to the table is formed on a fixed base 41 that is placed and fixed on the work table of the electrical discharge machine, and the holder 3o is supported on this guide rail 42 so that its vertical position can be freely adjusted. be. The running direction of the wire of the wire-cut electric discharge machine is parallel to the guide rail 42 or in the Taber direction set at a predetermined angle from this parallel direction, and the reference grooves 32 and 33 are set in a plane parallel to the guide rail 42. It is formed.

An example of a machining process by the present molded electrode machining system for electric discharge machining having the above configuration will be described below. First, an electrode blank 20 with a shape corresponding to the required electrode shape and an L suitable for this
After selecting the mold reference piece 10A or the working mold reference piece 10B and performing mounting hole drilling, grinding, etc. on the electrode blank 20, the reference piece 10 is fixed with the mounting hole 16 and the fixing screw (Figs. 1 and 2). figure).

The electrode blank 20 having this reference piece 1o is then held in the holder 3o of the electrode forming jig 40 and processed by wire cut electrical discharge machining. This process involves fitting and fixing the reference insertion/removal part 13 of the reference piece 1o into any one of the reference grooves 32, 33, 34 (thereby, the reference surface 2 of the reference insertion/removal part 13@the reference groove 32. 33, 34, the reference surface X is brought into close contact with the bottom surface of the reference grooves 32, 33, 34, and the reference surface y is roughly brought into close contact with the speech regulation piece 36.

If the electrode blank 20 is processed in one dimension,
The reference insertion/removal part 13 of the reference piece 10 is inserted into the reference groove 32, 33, 34.
If any of these are fitted together, the process is completed 1
), if the two-dimensional direction is used, the same two reference grooves 32, 33, 34 are sequentially fitted into the reference grooves 32, 33, 34. finish. 3(A), (8), and (C) are a plan view, a side view, and a front view showing an example of the shape of the molded electrode to be processed, and FIG. 4(A), CB), and (C) are , each reference groove 32 of the holder 30 when processing a shaped electrode into such a shape.
．． 33. It shows how the reference piece 10 is changed hands according to 33.34. Further, the arrow indicates the running direction of the electric discharge machining wire.

The electrode blank (formed electrode) 20 that has been processed by the wire-cut electrical discharge machine is then subjected to machining that cannot be performed by wire-cutting, using a machining machine such as Jig Polar, if necessary. In this case, a machining machine such as Jig Polar is also equipped with a holder identical to the holder 3o. For this machining, machining data for wire cutting can be given. At this time, it is also possible to measure the molded electrode.

What should be emphasized in the present invention is that it is possible to maintain extremely high processing accuracy when processing in two-dimensional or one-dimensional directions. That is, the electrode blank 20
The positional relationship between the reference piece 10 and the reference piece 10 is fixed and cannot be moved, and the relationship between the reference insertion/removal section] 3 of the reference piece 10 and the reference groove 32, 33, 3. 4 of the holder 30 is As long as it fits accurately into these grooves, it will not go out of order.

The positions of the valley grooves of the reference grooves 32, 33, and 34 can be entered in advance as data in the machining data input to the wire-cut electric discharge machine, so by incorporating the positional relationship of these valley grooves, two-dimensional or Accurate machining including three-dimensional machining can be performed. In addition, when performing taper processing, the running direction of the wire is inclined, and the holder 3
By adjusting the height position of 0 along the guide rail 42 of the electrode forming jig 40 and inputting the height of the holder 30 from the work table in the same manner, the taber given to the electrode blank 2o can also be freely set. be able to.

According to the above system, a complex three-dimensional shape can be given to the molded electrode, so the need for complex processing can be reduced. Furthermore, even if complex machining is required, complex shapes can be machined with a smaller number of molded electrodes.

Note that when electrical discharge machining is performed using the shaped electrode machined according to the present invention, the reference piece 10 can be used as is. 5 and 6 show a holder 30 mounted on a mounting shaft 51 or a mounting body 52 in order to mount the processed molded electrode 20 on the head 50 of an electrical discharge machine using the reference piece 107a.
It shows a fixed state. The holder 30 itself is made exactly the same as that shown in FIG. FIG. 5(8) shows an axis reference type in which the holder 30 is attached to the electric discharge machine head 50 by a mounting shaft 51, and FIG. Indicates the surface-based type. Reference numeral 54 denotes a regulating pin that regulates the rotation 171st position M of the mounting shaft 51 in the shaft reference type. In either the axis-based type or the plane-based type, the positional relationship between the axis 51 or surface 53 and the holder 30 can be known in advance, and the holder 30 can be moved to the electrical discharge machine head 50 in the required positional relationship. can be supported. When changing the set, there is no need for parallelization, centering, etc. The electrical discharge machine is given machining data and measurement data, that is, data about the actual shape of the formed electrode 20, and then electrical discharge machining is performed while the electrical discharge machine head 50 approaches the workpiece. Thus, the shape of the shaped electrode 20 is transferred accurately.

In this way, the same holder 3 as the electrode forming machine is installed on the electrical discharge machine side.
In particular, if a plurality of molded electrodes 2 of different shapes are provided,
This is effective when performing complex machining using 0. In other words, when performing 5 complex machining, the centering between the plurality of shaped electrodes 20 is an extremely important factor, but according to the above system, the centering between the plurality of shaped electrodes 20 has to be specially adjusted. It can be done with one touch without any need. Coupled with the fact that a complex and accurate shape can be obtained with one molded electrode 20, precise mold processing can be performed with a small number of molded electrodes.

As described above, the present invention can also be achieved by making the reference piece on the electrode blank side have a V-shaped cross section and making the reference groove on the holder side a V-shaped groove that matches this. (2) This is because the groove regulates the alignment of two orthogonal planes. If the reference insertion/removal portion and the reference groove of the reference piece are roughly formed into a cross shape without any difficulty in machining, the attachment/detachment operation will be simpler.

"Effect of the Invention J As described above, according to the processing system for a shaped electrode for electrical discharge machining of the present invention, a shaped electrode can be machined precisely in three-dimensional directions. Therefore, electrical discharge machining of complicated shapes can be easily performed. It is also possible to reduce the number of molded electrodes when performing composite processing.

In particular, when changing the set of electrode blanks in order to change the processing direction, no special adjustment work is required, which greatly improves work efficiency.

[Brief explanation of the drawing]

FIGS. 1(A) and (8) are perspective views showing examples of the shapes of the reference piece and electrode blank according to the present invention, and FIG. Perspective view showing the space, Figure 3 (A), (B), (C
) is a plan view, side view, and front view showing an example of the shape of a molded electrode to be molded from an electrode blank, and FIG. 4 is (A) and (B
), (C) are front views showing how the reference piece is changed when machining the shaped electrode of FIG. 3 using a wire-cut electrical discharge machine, and FIG. 5(A). CB) is a perspective view showing an example of a holder on the electrical discharge machine side, No. 6
Figures (A) and (8) are a perspective view and a side view of a state in which a molded electrode fixed to a head holder and a reference piece of an electric discharge machine is attached. x, y, z"" reference plane, 10 (10A, 10B)...
Reference piece, 13--Reference insertion/removal part, 14--Fixing bolt insertion hole, 15--Blank fixing part, 16--Mounting hole, 20--Electrode blank (molded electrode), 30--・Holder, 31...Rectangular parallelepiped block, 32.33.34・
...Reference groove (mounting reference surface), 36...Position regulation piece, 4
゜... Electrode forming jig, 42... Guide rail. Figure 1 Figure 5 Figure 6

Claims (3)

[Claims] (1) Attach a reference piece with reference planes in three orthogonal directions to serve as a positional reference during electrode molding to the electrode blank on which a molded electrode for electrical discharge machining is to be formed, and attach the reference piece to the holder of the electrode forming machine. A processing system for a molded electrode for electric discharge machining, characterized in that a mounting reference surface is provided that engages with the surface and holds the reference piece at predetermined positions in three orthogonal directions. (2) In claim 1, the reference piece has a block-shaped reference insertion/removal portion having three orthogonal reference planes,
The holder of the electrode forming machine has a reference groove that engages with three orthogonal reference surfaces of the reference piece to hold the reference piece at predetermined positions in three orthogonal directions. (3) In claim 1 or 2, the electrode forming machine is a wire-cut electric discharge machine, and the holder is vertically adjustable with respect to a work table of the wire-cut electric discharge machine. Processing system for molded electrodes for electrical discharge machining.