JPS6161929B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel manufacturing method for manufacturing an electrode matrix using a photosensitive resin and a matrix thereof.

Conventionally, the matrix (molding mold) for electrodes for electrical discharge machining was manually carved out of plaster, resin, wood, etc. into the desired matrix shape, which required a great deal of labor and time and was extremely expensive. I was getting used to it. Also, if you have a model, it is possible to use the model as a mold and create a matrix from it, but the model does not necessarily exist, and making molds from the model will result in large dimensional errors, making it impractical for practical use. There is a drawback that it cannot be used.

The present invention was made in view of the above-mentioned situation, and involves forming a solidified layer of photosensitive resin in an arbitrary shape for each unit thickness, and laminating a large number of these solidified layers to easily create a matrix for an electrode for electrical discharge machining having an arbitrary shape. Moreover, it is an attempt to provide a manufacturing method that produces high precision and a matrix obtained by this method.

Hereinafter, embodiments of the present invention and a matrix according to the embodiments will be described. First, the outline of the photosensitive resin used in the manufacturing method of the present invention will be explained. Photosensitive resins are commercially available under names such as Tevista, APR resin, and Aronix, and are liquid resins that solidify when exposed to ultraviolet light. The relationship between the exposure time and the depth of solidification is determined using a xenon lamp of 50W.
When using the light source, approximately 3 mm after 1 minute, approximately 8 mm after 5 minutes,
After 10 minutes, about 12mm, and after 20 minutes, about 16mm, the resin solidifies from the surface to the deepest part. The present invention is based on a method in which a region corresponding to the cross-sectional shape of the matrix of the electrical discharge machining electrode to be formed is solidified using this liquid resin, and the solidified layers are stacked. Note that the electrode to be molded has the same cross-sectional shape as this one, transparently drawn on a transparent film, and the number of cross-sectional views the electrode is divided into is determined by the complexity and precision of the electrode shape. However, no matter how complex the cross-sectional shape is, if the columnar electrode has the same dimensions and the same cross-sectional shape, then one transparent film will suffice. 1st
The figure shows an electrode matrix molding machine 10 for producing the matrix of electrodes for electrical discharge machining according to the present invention from photosensitive resin. A table 2 is provided. The table 2 is connected via a lower end bevel gear 4 on the rotating shaft 3 of the pulse motor PM and a bevel gear 6 on the horizontal drive shaft 5.
The table is raised and lowered by forward and reverse rotation. c.
is the control box for table 2, which includes knob S ₁ to set the inching feed amount of table 2, full stroke setting knob S ₂ , timer knob S ₃ to set the inching interval for the inching feed amount, and table continuous control box. It is equipped with a slow feed setting knob _S4 , a power switch _S5 , an inching feed/continuous feed selection switch _S6 , and a table upward/downward feed selection switch _S7 . L _a is a light source of a 500 W xenon lamp, which is irradiated perpendicularly onto the top surface of the table 2 as parallel light through a condenser lens 7 . This light source L _a is designed to turn off when the table 2 is raised or lowered when the inching feed is set, and the upper and lower limit positions of the table 2 are detected by proximity sensors L ₁ and L ₂ . F ₀ is a film plate covering the upper surface of the water layer 1, and a portion ₁ having the same cross-sectional shape as the matrix is treated to be transparent. With this, the light beam passing through the film plate F ₀ can illuminate the upper surface of the table 2 in the same manner as the cross section of the matrix, and the resin in this area can be solidified. Incidentally, the film plate F _{0 necessary for manufacturing the electrode matrix P 0} having the shape shown in Fig. 3 b and c is the second film plate F ₀ .
As shown in figures a to n, a large number of sheets are required. That is, the film plate F ₀ at the time of forming the bottom surface of the matrix P ₀ may be that of F ₁ , and as the solidified layers are stacked,
The petal-shaped black part ₁ ' drawn in the center of the transparent part ₁ is gradually replaced with a larger one, like F ₂ , F ₃ . . . F _o .

Next, the manufacturing process of the electrode matrix P ₀ of the present invention will be explained with reference to FIG. First, liquid photosensitive resin is placed in water tank 1.
Inject HP until nearly full. Next, place the film plate F ₁ on the top of the water tank and fix it, then adjust the inching feed amount (solidified layer thickness per unit thickness) and stop time (solidifying time) of table 2 using the respective knobs. Set with S ₁ and S ₃ . Of course, the setting may be made by continuous slow-speed feeding. Thereafter, as shown in FIG. 3a, the table 2 is submerged and fixed by a unit thickness of h ₁ from the surface of the photosensitive resin HP, which is a liquid resin, and the light rays from the light source _L are directed through the condenser lens 7 and the film plate. Irradiate the photosensitive resin HP via _F1 . Now the transparent part pattern
A photosensitive resin HP having the same shape as ₁ is solidified to a unit thickness h ₁ to become a solidified resin P ₁ . When the resin is sufficiently solidified, the timer causes the table 2 to be inched again by h ₁ and lowered to form the second layer of solidified resin P ₂ . As shown in Figure 3b below, the solidified resin reaches a predetermined height h ₀
The above operation is repeated by replacing the film plate up to F _o until the electrode matrix P ₀ of multiple solidified layers h _{1 .} . . is formed. The electrode matrix P ₀ is taken out from the table 2 and washed with water in the shower W as shown in FIG. 3c. After this, after finishing the surface, d and e in Figure 3
The surface of the electrode matrix P ₀ is coated with metal by forming an electrode layer M by, for example, copper plating or thermal spraying. Note that a film layer may be formed between the surface of the matrix and the electrode layer M to assist in peeling. Through the above steps, the master mold P ₀ ' of the electrode for electrical discharge machining is manufactured. Next, as shown in _FIG .
Molten resin or molten metal 30 is poured into a mold 20 having a letter-shaped opening, and an electrode core 40 is filled therein. Thereafter, as shown in FIGS. 3g and 3h, when the electrode core material 40 is pulled out from the master mold P ₀ ', the electrode layer M is also peeled off together with it, and an electrode for electric discharge machining is manufactured.

The embodiment of the master mold of the electrode for electrical discharge machining according to the present invention is not limited to the above, and other embodiments are possible. For example, the transparent shape light beam irradiated onto the table 2 by the lens 7 may be enlarged or reduced to form an image. According to this, the number of film plates can be reduced.

When using the method of manufacturing an electrode matrix for electric discharge machining of the present invention, the photosensitive resin is irradiated with light through a film plate having a transparent portion having the same cross-sectional shape as the matrix to solidify the photosensitive resin in units of thickness. The desired electrode matrix is formed by laminating a large number of the above-mentioned solidified layers, and then, after washing with water, the electrode surface of the electrode matrix is coated with the electrode layer that will become the electrode of the electrode core material. Even complex electrode matrixes can be easily produced, and the matrix has excellent adhesion between each lamination.
It is difficult to solidify the matrix while it is distorted or bent, which has the effect of making it possible to manufacture a highly accurate electrode matrix at low cost.

In addition, since the electrode matrix of the present invention has a multilayer structure made of photosensitive resin that is solidified for each unit thickness, the interlayer adhesion is extremely excellent and even complex electrode matrixes can be used with high accuracy and low cost. This has the effect of providing a low-cost electrode matrix.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an electrode matrix molding machine for manufacturing the electrode matrix of the present invention, FIG. 2 is a perspective view showing the order of replacing film plates corresponding to changes in the cross section of the solidified layer, and FIG. 3 is a perspective view of the matrix of the present invention. It is a process diagram showing the manufacturing process of. 1... Water tank, 2... Table, L _a ... Light source, HP... Photosensitive resin, F ₀ (F ₁ ~ F _o )... Film board, h ₁ ... Unit thickness, P ₁ ... Solidified resin, P ₀ , P ₀ ' ...Electrode matrix, M...
Electrode layer, 20'... Frame body, 20... Mold, 30... Molten metal, 40... Electrode core material.

Claims (1)

[Claims] 1. A photosensitive resin is irradiated with light through a film plate having a transparent part having the same cross-sectional shape as the electrode matrix to solidify the photosensitive resin in units of thickness, thereby forming a large number of the solidified layers. A method for producing an electrode matrix for electrical discharge machining, which comprises laminating the layers to form a desired electrode matrix, followed by washing with water, and then coating the electrode surface of the electrode matrix with an electrode layer that will become an electrode of an electrode core material. . 2. An electrode matrix for electrical discharge machining, characterized in that the electrode matrix has a multilayer structure formed of a photosensitive resin solidified in units of thickness.