JPH0714574B2 - Manufacturing method of electric discharge machining electrode for honeycomb die forming - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing an electric discharge machining electrode for forming a honeycomb die, and more particularly to a honeycomb die in which desired regular hexagonal forming grooves are provided in a mesh shape. A method for manufacturing an electric discharge machining electrode in which a plate-shaped protruding electrode portion corresponding to one side of the regular hexagonal forming groove is arranged in a staggered pattern, wherein a block-shaped electrode material preformed in a predetermined shape is used. The present invention relates to a method for manufacturing an electric discharge machining electrode for honeycomb die forming, wherein an electric discharge machining electrode having an integral structure is manufactured by cutting out the protruding electrode portion.

(Prior Art) Conventionally, a honeycomb die as shown in FIG. 9 is known as an extrusion die for forming a honeycomb body having a regular hexagonal cross section. 9A is a front view, FIG. 9B is a rear view, and FIG. 9C is a sectional view taken along the arrow AA. Reference numeral 15 in the figure denotes a honeycomb die, which has a forming groove 16 perforated in a shape corresponding to the cross-sectional shape of the honeycomb body to be formed, and a plurality of introducing holes 17 communicating with the forming groove 16. I have it. Reference numeral 18 represents an intersection.

The forming groove 16 of the honeycomb die 15 is generally formed by electric discharge machining. That is, an electric discharge machining electrode made of, for example, graphite (hereinafter referred to as an electrode) having a shape corresponding to the honeycomb body to be formed, or a metal electrode 21 or 21 as shown in FIG. 10 (A) or (B). It is performed by electrical discharge machining using 25. However, in general, the mesh shape (regular hexagon in the present invention) forming the honeycomb body is used.
Has a problem in that it is difficult to manufacture electrodes with high precision because the length of one side is about 2 mm and the wall thickness is about 0.2 mm. Also, the electrode 21 shown in FIG.
Nos. 24 to 24 are usually manufactured by pressing a copper plate, for example, but the bent portions are rounded, which is not preferable. Further, since the thickness is very thin, there is an undesired problem that it is easily deformed by the heat of discharge.

A method for manufacturing a honeycomb die (Japanese Patent Laid-Open No. 54-73809) has been already proposed for the purpose of solving the above problems. "Honeycomb die manufacturing method" of the proposal
Is a regular hexagon with at least three comb-teeth electrodes each having a side length equal to the comb-teeth length at regular intervals and comb-teeth
It is configured by stacking with a 1/2 shift, and by using this comb-tooth-shaped electrode body, the die block is sequentially rotated by 60 degrees relative to the comb-tooth-shaped electrode body, and the molding groove is formed.
16 is machined by electrical discharge machining.

(Problems to be Solved by the Invention) As described above, the shape corresponding to the honeycomb body to be formed,
That is, it is very difficult to manufacture an electrode having a shape corresponding to the molding groove 16 shown in FIG. 9, and there is an undesired problem that not only the manufacturing cost is high but also it is difficult to obtain a highly accurate electrode. .

In addition, the comb-teeth-shaped electrode body used in the above-mentioned “method for manufacturing a honeycomb die” proposed for the purpose of solving the above-mentioned problems has a plurality of comb-teeth-shaped electrodes at predetermined intervals and comb-teeth. Are fixed to a predetermined electrode holder in a state of being laminated so as to be shifted by 1/2. Therefore,
When assembling the plurality of comb-teeth-shaped electrodes, it is necessary to take great care to accurately arrange the respective comb-teeth-shaped electrodes. There is an undesired problem that the cost increases because a special electrode holder that takes into consideration the displacement of the comb-teeth-shaped electrodes is required.

Further, when the intersection of the molding grooves in the honeycomb die (for example, the intersection 18 shown in FIG. 9) is formed by the projection angle due to the plane intersection, a crack is generated at the intersection of the honeycomb body formed by the honeycomb die. Since it easily breaks when it is inserted, the intersection of the honeycomb dies is formed in an arc shape, for example, to enhance the strength of the intersection in the honeycomb body extruded from the honeycomb die. Manufacturing method (Japanese Patent Publication No. 51-20435)
Publication)). However, the comb tooth spacing of the comb tooth-shaped electrodes in the above-mentioned “method for manufacturing a honeycomb die (Japanese Patent Laid-Open No. 54-73809)” corresponds to the length between the longest vertices of a regular hexagon. There is an undesired problem that the intersection of the forming grooves in the honeycomb die processed by the electrode formed by combining a plurality of electrode-shaped electrodes is in a projection angle state due to the plane intersection.

(Means for Solving Problems) The present invention is intended to solve the above problems, and therefore, the method for manufacturing an electric discharge machining electrode for forming a honeycomb die of the present invention provides a desired regular hexagonal shape. In a honeycomb die having a forming groove, a plate-like protruding electrode portion corresponding to one side of the regular hexagonal forming groove is arranged in a zigzag pattern. For honeycomb die forming for forming an electric discharge machining electrode For honeycomb die forming In the method of manufacturing an electric discharge machining electrode, an electrode block having a thickness of a predetermined value or more has a predetermined width in a direction orthogonal to a side extending in one direction of the regular hexagonal forming groove, and Corresponding to the first pre-processing step of making a plurality of grooving grooves of a desired depth with related intervals, and a plurality of respective one sides corresponding to the side extending in the one direction of the regular hexagonal forming groove. That side A second pre-machining step in which a groove having a desired depth is left by leaving a molding target portion having a width larger than the width, and a width larger than the width of the one side obtained in the pre-machining step. A desired depth having a predetermined width at a predetermined interval in the direction of the one side so as to give the width of the plate-shaped protruding electrode portion to the molding target portions arranged in a staggered pattern It is characterized in that it is provided with a finishing processing step in which the left side surface and the right side surface of the staggered parts to be formed are processed at once by making a plurality of grooves. Hereinafter, description will be given with reference to the drawings.

(Example) FIG. 1 is a perspective view of an electrode manufactured by the present invention, and FIG.
(A) to (E) are explanatory views for explaining one embodiment of the present invention, FIG. 3 is a plan view of an electrode manufactured based on the embodiment shown in FIG. 2, and FIGS. 4 to 6 FIG. 7 is a partial plan view of a molding groove machined by electric discharge machining using an electrode (the electrode shown in FIG. 3 or the electrode shown in FIG. 8 described later) manufactured according to the present invention, and FIGS. 7A to 7C. Is an explanatory view for explaining another embodiment of the present invention, FIG. 8 (A)
7A and 7B are plan views of electrodes manufactured according to the embodiment shown in FIG.

The electrode 1 shown in FIG. 1 is an electric discharge machining electrode having an integral structure, which is manufactured according to the manufacturing method of the present invention described later. That is, the electrode 1 has an electrode base portion 2 and a protruding electrode portion 3 which are integrally formed. By performing electrical discharge machining by rotating the electrode 1 by 60 degrees relative to a die block, This is to process a forming groove for forming a regular hexagonal honeycomb. Hereinafter, the manufacturing method of the present invention will be described.

FIG. 2 is an explanatory view of an embodiment of the present invention. FIGS. 2 (A), (B) and (C) are pre-processing steps, FIG. 2 (D) is a finishing step, and FIG. ) Indicates a supplementary explanatory diagram relating to FIGS. 2 (A) to (D). And
In the figure, reference numeral 1'denotes an electrode block, 4 a first pre-machined groove, 5 and 5'a second pre-machined groove, and 6 a finishing machined groove. For convenience of explanation, the forming grooves in the honeycomb die to be formed are shown by the dotted lines in the drawing.

First, as shown in FIG. 2 (A), for example, an electrode block 1'made by molding a graphite material into a block shape.
On the other hand, parallel grooves having a predetermined pitch P _1, that is, the first pre-processed grooves 4, 4, ... Are cut. Groove width of the first pre-processed groove 4
The d ₁ and the pitch P ₁ are predetermined based on the shape size (dotted line in the drawing) of the honeycomb body (described later with reference to FIG. 2E). Further, the depth corresponds to the height H of the protruding electrode portion 3 shown in FIG.

Then, as shown in FIG. 2 (B), the first pre-processed groove is formed.
4,4, perpendicular to ... and a predetermined pitch P _2, a second pre-processed grooves 5,5 with the groove width d _2, which Kezumizo a ... in a zigzag pattern. The pitch P ₂ and the groove width d ₂ are predetermined based on the shape dimension (dotted line in the drawing) of the honeycomb body (described later with reference to FIG. 2 (E)), and the depth is 1 pre-processed groove 4
Similarly, the arrow H corresponds to the arrow H shown in FIG.

The second pre-machined grooves 5, 5, ... Are described above in relation to FIG. 2 (B), but instead of the second pre-machined grooves 5, 5, ... Shown in FIG. 2 (B) above. , FIG. 2 (C) before processing hole 5 as illustrated in ', 5', Pitchie P ₁ and described above a ...
P ₂ may be used for perforation. The diameter D of the pre-machined holes 5 ', 5', ... Is given by the following equation.

The processing steps shown in FIGS. 2A to 2C described above are the preprocessing steps referred to in the present invention.
The pre-machined grooves 5, 5, ... Or the pre-machined holes 5 ', 5', ... May be machined, and then the first pre-machined grooves 4, 4 ,.

After the completion of the pre-processing step, the finishing step shown in FIG. 2 (D) is performed. That is, a finish machining groove orthogonal to the first pre-machining grooves 4, 4, ... And having a predetermined pitch P ₃ and groove width d _3.
Groove 6,6, ... Although the pitch P ₃ has the same dimension as the pitch P ₂ shown in FIG. 2B,
The position is shifted by 1 / 2P ₂ (= 1 / 2P ₃ ). Further, the groove width d ₃ is the shape dimension of the honeycomb body (dotted line in the figure).
It is predetermined based on the above (described later in connection with FIG. 2E), and the depth is the arrow H shown in FIG.
It corresponds to.

By performing the pre-processing step and the finishing processing step described with reference to FIGS. 2 (A) to (D) above,
The electrode 1 shown in the figure is manufactured. A plan view of the electrode 1 is shown in FIG. In FIG. 3, the pitch Px of the protruding electrode portion 3 in the x direction, the pitch Py in the y direction, the plate thickness (corresponding to the width of the plate-shaped protruding electrode portion) t, and the length 1 are shown in FIG. 2 (A). To (D) are determined by P ₁ to P ₃ and d ₁ to d ₃ . That is, the desired cross-sectional shape of the honeycomb body is
As shown in FIG. 2 (E), if it is a regular hexagon and its thickness is t, and the length of one side of the center line of the thickness (one-dot chain line in the figure) is L, then the above P ₁ To P ₃ , and d ₁ to d ₃ can be set as follows. Hereinafter, a description will be given with reference to FIG.

The pitch P ₁ of the first pre-processed groove (solid line in the figure) 4 is “L (1+
sin 30 °) ”, and the groove width d ₁ is at least“ L sin 30 ° ”or less.

The pitch P ₂ of the second pre-machined groove (two-dot chain line in the figure) is "L co
s30 ° "and the groove width d ₂ is at least" t "or more.

The pitch P ₃ of the finishing machining groove (three-dot chain line in the figure) 6 is "L cos30
°, and the groove width d ₃ is “(L cos 30 ° −t)”.

Forming a honeycomb die as shown in FIG. 4 by performing electrical discharge machining by relatively rotating the electrical discharge machining surface of the die block by 60 degrees relative to the electrode 1 manufactured by the above-described manufacturing method. The groove 7 is formed. That is,
The forming groove 7 shown in FIG. 4 is the pitch P ₁ of the pre-processing grooves 4 and 5 and the finishing processing groove 6 in the above-mentioned pre-processing step and finishing processing step.
To P ₃ and groove widths d ₁ to d ₃ are formed by using the electrode 1 manufactured under the above-mentioned setting conditions. However, since the intersecting portion 10 of the forming groove 7 shown in FIG. 4 is formed by the projection angle due to the plane intersection, it is not preferable for the reason explained at the beginning of the specification of the present application with reference to FIG. That is, as shown in FIG. 5, the intersecting portion 10 is formed into a linearly so-called chamfered shape, or as shown in FIG. 6, an arc-shaped chamfered shape. Is desired. In order to form the forming groove 8 as shown in FIG. 5, the electric discharge machining is performed by moving the electrode 1 shown in FIG. 3 by a predetermined distance in the longitudinal direction of the protruding electrode portion 3. good. In this way, when the electric discharge machining is performed by moving the electrode 1, the groove width d ₁ of the first pre-machining groove 4 described above with reference to FIG.
It doesn't have to be less than ° ".

Next, another embodiment of the present invention will be described with reference to FIG. The embodiment shown in FIG. 7 is basically the same as the embodiment shown in FIG. 2 described above, except that the forming groove 8 shown in FIG. FIG. 6 is a method of manufacturing an electrode that is capable of processing the forming groove 9 shown in the figure.

In the embodiment shown in FIG. 7, as the pre-processing step,
As shown in FIG. 7A or FIG. 7B, the third pre-processed groove 11 or 11 'is cut. The third pre-machined groove 11 or 11 'corresponds to the second pre-machined groove 5 in the embodiment shown in FIG. 2 and has a pitch P ₄ and a groove width.
d ₄ is the same as the pitch P ₂ and the groove width d _{2 of the} pre-processed grooves 5. Further, the dimension in the longitudinal direction of the third pre-processed groove 11 shown in FIG. 7 (A) is at least smaller than the length between the facing apexes of the regular hexagon shown by the dotted line. The 7th
Although the third pre-processed groove 11 is illustrated as a rectangle in FIG. 7A, the corners may be formed in an arc shape.

The third pre-machined groove 11 'shown in FIG. 7 (B) is formed by moving the grooving tool 12 in the direction of the arrow shown in FIG. 8 (B). This is for forming the end face in the longitudinal direction of the protruding electrode portion 13 'into a predetermined arcuate curved surface.

After the completion of the pre-processing step described with reference to FIGS. 7A and 7B, the finishing step shown in FIG. 7C is performed. The finishing process is performed in exactly the same manner as the embodiment shown in FIG. That is, the projecting electrode portion 13 is formed by removing the shaded portion in the drawing in the finishing process.

FIG. 7 shows an electrode 14 manufactured according to the embodiment shown in FIG.
14 'is shown in FIGS. 8A and 8B. 8th
The electrode 14 shown in FIG. 8 (A) was manufactured through the pre-processing step described in connection with FIG. 7 (A), and FIG. 8 (B).
The illustrated electrode 14 'is manufactured through the pre-processing step described with reference to FIG. 7 (B).

The electrode 14 or 14 'manufactured according to the embodiment shown in FIG. 7 is swung relative to the electric discharge machining surface of the die block by 60 degrees in order to perform electric discharge machining. The forming grooves 8 and 9 of the honeycomb die shown in FIG. 6 are formed. If the relation of L> 3.9t is satisfied in FIG. 7 (A), a pre-processing step as shown in FIG. 2 (A) to (C) is performed instead of FIG. 7 (A). It may be done.

(Effects of the Invention) As described above, according to the present invention, a plate-shaped projection corresponding to one side of the regular hexagonal molding groove in a honeycomb die in which desired regular hexagonal molding grooves are provided in a mesh shape. It becomes possible to easily and easily manufacture an electrode for electric discharge machining having an integral structure in which the electrode portions are arranged in a staggered pattern. By performing electric discharge machining using the electric discharge machining electrode, the forming groove of the honeycomb die can be formed. Can be processed with high precision.

[Brief description of drawings]

FIG. 1 is a perspective view of an electrode manufactured according to the present invention, and FIG.
FIGS. 3A to 3E are explanatory views of an embodiment of the present invention, and FIG.
FIG. 4 is a plan view of an electrode manufactured according to the embodiment shown in FIG. 2, and FIGS. 4 to 6 are portions of a forming groove machined by electric discharge machining using the electrode manufactured according to the present invention. FIGS. 7A to 7C are plan views showing another embodiment of the present invention, and FIGS. 8A and 8B show electrodes manufactured according to the embodiment shown in FIG. Top view, No. 9
Figures (A) to (C) are explanatory views of a general example of a honeycomb die, and Figures 10 (A) and (B) show a conventional example of an electrode. In the figure, 1, 14 and 14 'are electrodes, 2 is the electrode base, 3, 13 and 1
3'is a protruding electrode portion, 4 is a first pre-processed groove, 5 and 5'is a second pre-processed groove, 6 is a finish machined groove, 7 to 9 are forming grooves, 10 is an intersection, 11 and 11 '. Is a third pre-machining groove, and 12 is a grooving tool.

Continuation of front page (56) References Japanese Patent Publication Sho-49-34381 (JP, B1)

Claims (1)

[Claims] 1. A honeycomb die forming discharge in which plate-shaped protruding electrode portions corresponding to one side of the regular hexagonal forming grooves in a honeycomb die having desired regular hexagonal forming grooves are arranged in a staggered pattern. In a method for manufacturing an electric discharge machining electrode for forming a honeycomb die for forming a machining electrode, a direction orthogonal to a side extending in one direction of the regular hexagonal molding groove with respect to an electrode block having a predetermined thickness or more. A first pre-machining step of forming a plurality of grooves having a desired width and having a desired depth with a spacing related to the side, and a side of the regular hexagonal forming groove extending in the one direction. Corresponding to each of the plurality of corresponding one side, a second pre-processing step of grooving to a desired depth leaving a molding target portion having a width larger than the width of the one side, and the pre-processing step. Larger than the width of the one side where In order to give the width of the plate-shaped protruding electrode portion to the molding target portions that are arranged in a zigzag pattern where there is a certain width, it is desirable to have a predetermined width at a predetermined interval in the direction of the one side. A plurality of grooving depths are provided, and a finishing processing step is carried out for processing the left side surface and the right side surface of the staggered forming target parts all at once. A manufacturing method of an electric discharge machining electrode for forming a honeycomb die.