JPH01197027A - Method for manufacturing metal die - Google Patents

Abstract

PURPOSE:To manufacture a metal die bearable to high pressure acting at forming time by flowing a remelt substance into a vacant space in the opposite side to a forming face which is formed between a base and a holding frame holding the base and solidifying the substance. CONSTITUTION:A vacant space 6 is demarcated by a base 2, wire bodies 3, and a base holding frame 5 in the opposite side to a forming face. A cooling pipe 12 into which a coolant flows and a heater 13 heating a remelt substance to be filled into the space 6 are installed in the space 6. At the time of surely fixing the wire bodies 3 temporarily fixed and supported by the base 2 through elastic members 4 against the base 2 and frame 5, a remelt substance 11, which solidifies at room temp., is remelted by heating at a prescribed temp., and those solidification and remelting are reversible, is heated at a temp. higher than the prescribed temp. to be melted and the molten low melting point alloy 11 is flowed into a fill the space 6. Immediately after filling, a coolant is flowed into the pipe 12 to cool and solidify the alloy 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for making a mold used, for example, in press molding, in which the shape of the molding surface can be freely changed.

[Prior Art] As is well known, for example, molds used for press molding etc. are usually made of a block-shaped steel material that undergoes cutting or other processing to adjust the shape and dimensions of the molded product. It is manufactured by forming a molding surface with a corresponding predetermined shape and dimensions.

Therefore, these molds must be manufactured individually for each type of molded product having a different shape and size.

For this reason, especially in high-mix, low-volume production, the production quantity per mold is small, so the mold cost per product is high, which significantly increases the cost of the product. Since it is necessary to prepare different types of molds, there is a problem in that it costs a lot of money to maintain and manage the molds, such as securing a storage space for them.

In addition, conventionally, these molds are manufactured through a number of processes such as cutting, as mentioned above, which takes a long time to manufacture, and it is difficult to respond quickly to changes in the production line due to product diversification. The problem is that it is difficult.

Therefore, various ideas have been made to solve the above problems, one of which is to make it possible to form a molding surface relatively easily and to freely change the shape of the molding surface. A mold that can do this is being considered.

For example, in Japanese Patent Application Laid-Open No. 59-35848, as shown in FIG. 7, a plurality of pins 93 are arranged on the model plate 92, and as shown in FIG. A height adjusting member 94 having a height adjusting member 96 is attached to each pin 93, and the female threaded portion 96f of each nut 96 is
The model plate 92 of each pin 93 is formed by a screw mechanism consisting of a male screw portion 93f screwed onto each pin 93,
By adjusting the vertical position of each pin 93 relative to the model plate 92 to a predetermined height, the upper end portions 93a of each pin 93 can be formed in a predetermined shape. A mold 91 that forms a surface 91a has been proposed.

According to this mold 91, when it becomes necessary to change the shape of the molding surface in order to apply it to a molded product having a different shape, etc., the height of each pin 93 can be adjusted freely. Its shape can be changed to

[Problems to be Solved by the Invention] However, according to the above conventional method, although it is possible to freely change the shape of the molding surface 91a according to the shape of the molding surface, the mold 91a is The molding reaction force applied to is supported only by the threaded joint between the male threaded part 93f of the pin 93 and the female threaded part 96f of the nut 96, so it is difficult to withstand high pressure, and it is difficult to withstand high pressure. The problem was that it could not be applied.

[Purpose of the Invention] This invention was made in view of the above-mentioned problems, and provides a metal molding surface in which a molding surface is formed at the ends of a plurality of wire rods, and the shape of the molding surface can be freely changed. It is an object of the present invention to provide a method for making a mold that can withstand high pressure applied during molding by improving the support strength for each of the wire rods described above.

[Means for Solving the Problems] Therefore, the present invention provides a mold that includes a plurality of wire rods that are vertically movably supported with respect to a base, and that forms a molding surface at the ends of the plurality of wire rods. In the production method, after determining the vertical position of the wire with respect to the base and forming the molding surface,
Each of the wire rods is injected into a space formed between the base and a holding frame that holds the base and covers the non-molding surface side of the wire rod, and solidifies the re-melt material. is fixed to the base and holding frame.

[Effects of the Invention] According to the present invention, after determining the vertical position of each wire relative to the base to form a molding surface, an anti-molding surface is formed between the base and a holding frame that holds the base. By injecting re-melting material into the space on the side and solidifying this re-melting material, each of the wire rods is fixed to the base and holding frame. , the wire rod can be firmly fixed to the base and the holding frame.

As a result, the support strength for the wire rods can be improved compared to the conventional method in which each wire rod 93 was supported only by screw connections, and it can be applied to press molding, etc., where a high molding reaction force acts on the mold during molding. can be achieved.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

As shown in FIG. 2, the press molding mold 1 according to the present embodiment includes a flat base 2 and a base 2 formed by penetrating through the base 2.
It is provided with a plurality of wire rods 3 having, for example, a circular cross section, which are attached vertically to formed larger than the diameter of the portion 3b,
Adjacent wire rods 3. ..., 3 lower end portion 3a between ..., 3
The gap in a is set to be as small as possible.

In this embodiment, each of the wire rods 3 is preferably provided to be vertically slidable relative to the base 2. That is, as shown in FIG. 3, the main body 3b of the wire 3 passes through a mounting hole 2a drilled in the base 2, and an elastic member 4 made of, for example, rubber, is fixed to the lower surface of the base 2. The wire rod 3 is supported by the base 2 via the elastic member 4 by the biasing force of the elastic member 4 acting in the center direction of the cross section of the main body portion 3b of the wire rod 3.

Therefore, by applying a force in the longitudinal axis direction of the wire 3 that exceeds the frictional force generated between the elastic member 4 and the main body 3b of the wire 3 due to the biasing force, the wire 3 can be easily attached to the base 2. It can be slid up and down.

Then, for example, each lower end 3a of the plurality of wire rods 3 is pressed from below to set the height of each lower end surface 3c relative to the base 2 to a predetermined height. 3a forms the molding surface 1a of the mold l.

That is, as shown in FIG. 4, the molding surface 1a is formed by connecting the lower end portions 3a, ..., 3a of the plurality of wire rods 3 in a predetermined three-dimensional shape, and the shapes etc. are different. When it becomes necessary to change the shape of the molding surface 1a, such as when applying it to a molded product, the height of the lower end surface 3c, ..., 3c of each wire rod 3 relative to the base 2 is reset. This allows the shape to be easily changed.

In this embodiment, as described above, each wire rod 3 is preferably supported with respect to the base 2 by the biasing force of the elastic member 4. Therefore, when determining the vertical position of each wire rod 3, it is preferable to use the urging force of the elastic member 4. There is no need to perform screw adjustment for each wire 3, and by pressing the end 3a of each wire 3, the vertical position can be easily adjusted.

After forming the molding surface 1a as described above, the base 2 and the wire 3. ..., 3 are attached and fixed to the base holding frame 5 to complete the mold 1, which is then used for molding operations such as press molding.

By the way, in this example, the above-mentioned wire rod 3. ..., 3 to the base 2, the base 2 and the wire 3
．． . . . remelting, in which solidification and melting can be performed reversibly by applying predetermined thermal conditions to the space 6 on the side opposite to the molding surface defined by 3 and the base holding frame 5. By filling the material and solidifying the remelted material, the wire rod 3. ..., 3 are fixed to the base 2 and the base holding frame 5 so as to be able to withstand the molding pressure applied to the mold 1 during press molding work.

Below, wire rod 3. ..., 3 to the base 2 and the base holding frame 5 will be described.

As shown in FIG. 1, the base 2 and the wire 3°...
3 and the base holding frame 5, a space 6 on the side opposite to the molding surface.
includes a cooling pipe 12 through which a refrigerant passes in order to cool the remelted material to be filled in the space 6.・・・
, 12, and a heater 1 for heating the remelted material.
3 is provided.

The cooling pipe 12. . . , 12 are the wire rods 3 .
..., due to the delay in solidification in the vicinity of wire rod 3, a cavity is formed in this portion, and the wire rod 3. . . , 3, more preferably the wire rod 3. ..., many are provided near 3.

Then, the temporarily fixed wire rod 3 is supported on the base 2 via the elastic member 4. When fixing . remelting material, which can be made to
For example, the low melting point alloy 11 is heated to a predetermined temperature (melting point) or higher to make it into a molten state, and the low melting point alloy 11 in this molten state is
is injected and filled into the space 6 on the side opposite to the molding surface. Then, while completing the filling of the low melting point alloy 2, the cooling pipe 12. ..., 12 to cool and solidify the low melting point alloy 11.

Due to this, wire rod 3. ..., 3 are firmly fixed to the base 2 and the base holding frame 5 via the solidified low melting point alloy II. At this time, as mentioned above, cooling pipe +2.
..., 12 is wire rod 3. . . , 3, and the low melting point alloy II is solidified near the wire 3. ....

3, so the above wire rod 3. . . ., no cavity is generated in the vicinity of 3.

After the low melting point alloy 11 has been sufficiently solidified in the manner described above, the supply of refrigerant is stopped, and the low melting point alloy 11 is used for molding operations such as press molding.

In addition, after the molding operation using the mold 1 is finished, when molding different types of products using the mold 1,
The wire rod 3. ...
, 3 can be returned to the state where they are only temporarily fixed to the base 2 via the elastic member 4, and in this state, the wire rods 3.・
By readjusting the heights of the end surfaces 3c, . . . , 3, a new molding surface corresponding to the external shape of the molded product can be formed.

As described above, according to this embodiment, after determining the vertical position of each wire rod 3 with respect to the base 2 and forming the molding surface 1a, the base 2 and the wire rod 3. ....

3 and the base holding frame 5 are injected and filled with the low melting point alloy 11 in a molten state, and this low melting point alloy II is solidified, so that the solidified low melting point alloy t
't through the wire 3. ....

3 can be firmly fixed to the base 2 and the base holding frame 5. As a result, each wire 9 is connected only by screw connection.
Compared to the conventional method, which supported wire rods 3.・
..., 3 can be improved, and can be applied to press molding, etc., where a high molding reaction force acts on the mold l during molding.

In addition, in this embodiment, a cooling pipe 12 is used to cool the low melting point alloy 11 filled in the space 6 when the low melting point alloy 11 is solidified. ..., 12 as wire rod 3. . . , 3, the low melting point alloy 11 is placed near the wire rod 3.・・・
The wire rod 3. is cooled and solidified from the vicinity of the wire rod 3. This can prevent a cavity from forming in this area. ..., 3
Therefore, stable support strength can be obtained.

In the above embodiment (hereinafter referred to as the first embodiment), each wire 3
When temporarily fixing the wire rod 3. to the base 2, the elastic member 4 is used instead of the conventional screw mechanism. .
Wire rod 3. ..., if the fixation in 3 becomes loose,
Wire rod 3. ..., 3 may fall off downward. To solve this problem, the above-mentioned falling off can be prevented by devising the shape of the end of each wire 3 on the side opposite to the molding surface.

A second embodiment of the invention will be described below. still,
In the following explanation, the same parts as in the first embodiment are given the same reference numerals, and further explanation will be omitted.

As shown in FIG. 5, a large diameter portion 23e having a larger external dimension than the wire main body portion 23b is formed at the end portion 23d of the wire rod 23 according to this embodiment on the side opposite to the molding surface. In addition, in FIG. 6, the outer diameter of the end 33d on the side opposite to the forming surface is the same as the outer diameter of the wire main body 33b, but
A wire rod 33 is shown in which an undercut portion 33e having a tapered surface is formed at 3d.

By forming the ends 23d and 33d of the wire rod 23.33 on the side opposite to the molding surface as described above, the elastic properties of the elastic member 4 deteriorate and the holding force for the wire rod 23.33 decreases, and the lower melting point Even if the wire rod 23.33 is loosened in the fixation of the wire rod 23.33 by the alloy 11, the wire rod 23.33 can be fixed to the large diameter portion 23e1 or the undercut portion 33e provided at the ends 23d and 33d on the side opposite to the molding surface, respectively. It is possible to lock the wire rod 23, 33 to the low melting point alloy 11 and prevent the wire rod 23, 33 from falling off downward.

Further, in the first embodiment described above, the heater 13 was used when melting the low melting point alloy 11 again, but instead of this heater 13, a heating tube through which a heating medium passes is provided, and this heating tube is used. It is possible to heat and melt low melting point alloys. In this case, the heating tube is connected to the cooling tube 12. ...,
12, and if it becomes necessary to finely adjust the vertical position of a particular wire 3, only the low melting point alloy 11 near that wire 3 is heated. By softening the wire rod 3, the vertical position of only the specific wire rod 3 can be finely adjusted.

In all of the above embodiments, the low melting point alloy 11 was used as the remelting material to be filled in the space 6, but instead of the low melting point alloy 11, it was solidified at room temperature and had a predetermined value. A thermoplastic resin that becomes fluid when heated above the temperature can be used. In this case, more preferably, reinforcing fibers are added to the resin to further improve the support strength for the wire.

In addition, although the above-mentioned embodiments were all applied when each wire rod 3, 23, 33 was temporarily fixed to the base 2 by the elastic member 4, the present invention is limited to the above-mentioned case. Of course, the present invention can also be applied to a case where the wire rod is attached to the base using a screw mechanism as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of the entire mold according to the first embodiment of the present invention, FIG. 2 is a front view showing the state in which the wire rod of the mold according to the first embodiment is temporarily fixed to the base, and FIG. The figure is an enlarged longitudinal sectional view of the wire attachment part of the mold according to the first embodiment, and FIG. 4 is a perspective view showing a part of the molding surface of the mold according to the first embodiment. 5 and 6 are longitudinal sectional views showing an enlarged end of the wire rod according to the second embodiment of the present invention on the side opposite to the molding surface. FIG. 7 is a front view of the mold according to the conventional example. FIG. 8 is an enlarged vertical cross-sectional view of a wire mounting portion of a mold according to a conventional example. l... Mold, 1a... Molding surface of the die, 2... Base, 3°23.33... Wire, 3a... Lower end of wire, 5... Base holding part, 6... Space on the side opposite to the molding surface,
II...Low melting point alloy. Patent Applicant Mazda Motor Corporation Agent Patent Attorney Aohaku Ao and 2 others Figure 5 Figure 7

Claims (1)

[Claims] (1) A method for making a mold comprising a plurality of wire rods supported vertically movably relative to a base, and forming a molding surface at the ends of the plurality of wire rods, the vertical position of the wire rods relative to the base. After determining the molding surface and forming the molding surface, a remelted material is injected into the space formed between the base and a holding frame that holds the base and covers the side of the wire rod opposite to the molding surface. A mold making method characterized in that each of the wire rods is fixed to the base and the holding frame by solidifying the remelted material.