JPH11347798A - Forming die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the forming die excellent in workability and cost effectiveness by exchanging a upper/lower pair of tip members only to form a formed part with green compact, etc., in exchanging due to wear. SOLUTION: A pair of pestles 12, 13 which are faced up/down in a mortar 11 buried in a work table 10 of a press machine and are mounted elevatable, are removably fixed to tip parts of respective shank members 14, 15, further, its tip part is constituted of a tip member 16 having a recessed part 28 of a shape conforming to an external shape of a formed part 101, in the case of changing due to wear, the tip member 16 only is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold used to obtain a molded product by mounting it on various press machines, and more particularly, a mold resin tablet for electronic parts such as semiconductors, a ceramic capacitor, a tantalum capacitor, The present invention relates to a mold for molding electronic parts such as magnets, mechanical parts such as sintered products, tablets, chemicals, and confectionery foods such as ramune.

[0002]

2. Description of the Related Art Conventionally, although not shown, this kind of mold for obtaining the above-mentioned molded product is a work in which a pair of upper and lower punches mounted on a die are formed as an integral body.

[0003]

As is well known, when precision is required or when mass production is required, a mold material having a small deformation due to tempering and having high wear resistance, for example, tungsten carbide (a cemented carbide) is required. It is used, but it has poor processability and is very expensive. By the way, because the pair of punches in the conventional upper and lower parts is an integral body, when the concave shape surface of the tip of the punch for forming a molded article is worn, the entire upper and lower punches must be replaced with a new one. There is a problem in terms of workability, and there is a problem that it is extremely uneconomical in terms of cost.

The present invention has been made in view of such a conventional problem, and has as its object to replace a shank member with the shank member without forming a pair of upper and lower punches integrally. In the case of abrasion, by forming a separate body from the chip member that is fixed as a member, only the tip member is replaced, so that the workability is good, the cost can be reduced and the molding metal is economically excellent. Is to provide a type.

[0005]

In order to achieve the above object, the present invention provides a press machine using a powder compact or the like between the tips of a pair of punches which are mounted on a press machine via a die so as to face each other. A molding die from which a molded product is obtained, wherein the pair of upper and lower punches are detachably fixed to the upper and lower shank members to be inserted into the dies, respectively, and to the distal ends of the upper and lower shank members, and Each of the tip surfaces is characterized by including upper and lower chip members having a concave portion having a shape adapted to the outer shape of the molded product.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a partial cross-section of an example of a molding die according to the present invention, and FIG. 2 is an enlarged cross-sectional view of the above-mentioned partially omitted molding.
A rotary (rotary) press machine and other known resin molding, ferrite molding, ceramic molding, tablet molding, and other various press machines, such as a tablet machine, are mounted on a work table 10 via a die 11 buried in a work table 10 so as to be movably mounted to face each other. A pair of punches 12 and 13 is formed, and a molded product can be obtained between the tips of the pair of punches 12 and 13 by using a powder compact or the like.

[0007] Further, with reference to the molding process principle diagram shown in FIGS. 9 to 13, for example, when obtaining a ceramic molded product, first, powder is placed on the tip of the lower punch 13 in the die 11. 100 is filled into the mortar 11 so as to be slightly heaped (see FIG. 9), and then the heaped portion of the powder 100 is cut off (see FIG. 10). Next, the upper punch 12 is lowered in the direction of the solid line arrow shown in FIG. 10, and the powder 100 is pressed between the tip of the upper punch 12 and the tip of the lower punch 13 (see FIG. 11). Rises in the direction of the solid arrow shown in FIG. 12 and returns to the original position (see FIG. 12), and then the lower punch 13 rises in the direction of the solid arrow shown in FIG. Is extruded from the mortar 11 and taken out as a product (see FIG. 13).

The molded article 101 is obtained by such a molding process. However, when the tips of the upper and lower punches 12 and 13 which are pressure molded parts are worn, it is necessary to replace them with new ones. In this case, conventionally, the entire punches 12 and 13 had to be replaced as described above. In view of the fact that it is uneconomical to replace the entire cemented carbide punch, in the present invention, the upper and lower punches 12, 13
Are preferably shank members 14, 1 made of a tool steel material having excellent wear resistance or a cemented carbide material.
5 and a tip member 16 which is detachably fixed to the shank members 14 and 15 and is preferably made of a cemented carbide material.
This is a molding die which can be replaced with only 6 and is economical.

As shown in FIGS. 2 to 4, the shank member 14 of the upper punch 12 has a large hole having a head hole 19 of a fixing bolt 17 having a hexagonal hole and a bolt part insertion hole 20 at the center. And a slightly smaller cylindrical portion 21 having a large diameter chip member insertion hole 22 integrated with the base portion 18 and communicating with the bolt insertion hole 20. A vertical keyway 23 is provided from the edge to the middle.

[0010] Tip member insertion hole 22 of shank member 14
As shown in FIGS. 2, 5, and 6, the tip member 16 detachably attached to the
And a cylindrical insertion portion 24 having an outer diameter substantially equal to the inner diameter of the tip member insertion hole 22 and a length substantially equal to the depth of the tip insertion hole 20. And a disc-shaped pressing portion 27 having a slightly larger diameter integrated with the insertion portion 24 via the step portion 26, and the upper surface of the pressing portion 27 has a shape adapted to the outer shape of the molded article 101. A depressed portion 28 is formed, and further, a rotation preventing projection 29 that fits into the key groove 23 from the lower surface of the pressing portion 27 of the insertion portion 24 to the intermediate portion is formed.

The cross-sectional shape of the pressing portion 27 and the concave portion 28
Of course is not limited to the shape shown in the figure, and is set in conformity with the outer shape of the product to be molded.

As shown in FIG. 2, the tip member 16 is provided with rotation preventing means by fitting the projection 29 and the key groove 23 so that the insertion portion 24 is inserted into the tip member insertion hole 20. And is attached to the shank member 14, and the fixing bolt 17 is used by being screwed into the bolt blind hole 25 from the bolt insertion hole 20 via the spring washer 30 and fixed. In some cases, the tip member 16 is removed by inserting a tool into the hexagonal hole in the head and removing the fixing bolt 17, and is replaced with a new one.

The shank member 14 and the tip member 16
It is also possible to use a mechanical means other than bolting or an adhesive combined means.

The shank member 1 constituting a part of the lower punch 13
5 has the same configuration as the upper shank member 14 except that the cylindrical portion 31 is longer than the cylindrical portion 21 of the upper shank member 14, as shown in FIGS. 3 and FIG. 4 are denoted by the same reference numerals, and the same portions will not be described repeatedly.

The tip member 16 is bolted to the lower shank member 15, similarly to the upper shank member 14, and the tip member 16 is removed and replaced by removing the bolt.

[0016]

According to the present invention, since the upper and lower punches have a separate structure of the shank member and the tip member, the entire punch is replaced as in the prior art when worn out. There is no need to replace only the tip member, and the shank member can be used continuously as it is.Therefore, only the tip member needs to be processed, making it easier to process. It is excellent.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of an example of a molding die according to the present invention.

FIG. 2 is an enlarged cross-sectional view of FIG.

FIG. 3 is a longitudinal sectional view of an upper shank member.

FIG. 4 is an end view as viewed from four directions in FIG. 3;

FIG. 5 is a longitudinal sectional view of a tip member.

FIG. 6 is an end view as viewed from six directions in FIG. 5;

FIG. 7 is a longitudinal sectional view of a lower shank member.

FIG. 8 is an end view seen from eight directions in FIG. 7;

FIG. 9 is a view showing the principle of a powder filling step in a molding step using the present mold.

FIG. 10 is a view showing the principle of a powder cutting process in a molding process using the present die.

FIG. 11 is a principle diagram of a powder pressing step in a molding step using the present mold.

FIG. 12 is a principle diagram of an upper punch raising process in a molding process using the present die.

FIG. 13 is a principle diagram of a molded product taking-out process by raising a lower punch in a molding process using the present die.

[Explanation of symbols]

 Reference Signs List 11 mortar 12 upper punch 13 lower punch 14 upper shank member 15 lower shank member 16 tip member 28 concave portion 101 molded product

Claims (1)

[Claims] 1. A molding die for forming a molded product by means of a powder compact or the like between a pair of tips of a pair of punches mounted on a press machine via a die through a die. A pair of punches are detachably fixed to the upper and lower shank members inserted into the mortar, and to the distal ends of the upper and lower shank members, respectively, and each of the distal end surfaces conforms to the outer shape of the molded article. A molding die comprising a configuration including upper and lower chip members having concave portions of a shape.