JP2795752B2 - Manufacturing method of press die - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a press die suitable for trial production or small-scale production.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing this kind of die,
Japanese Patent Application Laid-Open No. 62-81226, which was previously proposed by the present applicant, is known. This technology uses a press mold consisting of a male mold, a female mold, and a blank holder. When a female mold is manufactured, a heat-resistant sheet equivalent to the product thickness is attached to the entire surface of the male mold. Is fixed to a base, the periphery of the mold portion is surrounded by a mold frame, and a low melting point material is injected and filled into a space formed around the heat-resistant sheet to obtain a female mold portion. The female mold part thus obtained is fixed to the base, the mold is opened, and the sheet on the male mold part surface is removed,
Manufactures low-profile press dies.

[0003]

In the prior art described above, a heat-resistant sheet is attached to the entire surface of the male mold when forming a gap corresponding to the product plate thickness when the female mold and the male mold are closed. It is difficult and difficult to stick the sheet along the three-dimensional shape of the mold part because it is difficult to work, and it requires skill, and the work is, for example, It is necessary to stick a sheet of glass fiber etc. with a thickness that is not good at all on the entire surface of the three-dimensional shape with height, width and height using an adhesive. Therefore, it is difficult to adhere while maintaining high accuracy. Therefore, the production is troublesome and difficult, the production man-hour is increased, and moreover, it is necessary to use many heat-resistant sheets, and the cost is increased in addition to the above-mentioned circumstances of the production. Also, a mold whose design is frequently changed, such as a mold used for trial production, and a mold for small-scale production are extremely disadvantageous in terms of cost and production.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its object is to enable machining of a press die for trial operation and small-quantity production in a short time and with a minimum number of man-hours. It is an object of the present invention to provide a method of manufacturing a pressing die that can be easily and inexpensively manufactured by omitting as much as possible, and can easily cope with a change in plate thickness.

[0005]

According to the first aspect of the present invention, there is provided a pressing mold comprising a female mold and a male mold , one of which is movable and the other is fixed, and a blank holder. In, fix the male part to the base,
Only the vertical wall portion except for the portion of the upper surface, and attaching a heat-resistant sheet so that the products and Doatsu to be molded, then the male
A space for molding the female mold part is formed by surrounding the part with a mold frame, and a low melting point material is filled into this space to form a female mold part corresponding to the male mold part, and then the mold is formed. Open the male part
Removing the sheets stuck only to the vertical wall portion, the female, during mold closing of the male, only the vertical wall portions of both mold portions, to form a gap corresponding to the product thickness, closing the mold Adjust the operating height of the product by the thickness of the product , and close both molds.
And between the opposing upper and lower surfaces of both mold parts,
It is characterized in that a corresponding gap is formed .

According to a second aspect of the present invention, there is provided a method of manufacturing a press die according to the first aspect, wherein the male part is made of an iron-based material and the female part is made of a ZAS material.

[0007]

According to the above means, when forming the female mold using the male mold, the heat-resistant sheet is adhered only to the vertical wall portion of the male mold, so that the mold can be manufactured. It is easy and a gap corresponding to the plate pressure is formed between the male and female mold parts during the mold closing operation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an explanatory vertical sectional side view of mold casting, and FIG.
Is a longitudinal sectional side view of the obtained female mold, FIG. 3 is a longitudinal sectional side view of a male mold, FIG. 4 is a longitudinal sectional side view of a male mold to which a heat-resistant sheet is attached, and FIG. It is a figure showing a state. In FIG. 3, reference numeral 1 denotes a male mold, which comprises a lower plate 2 for fixing the mold, and a mold part 3 fixed thereon. The mold part 3 has a central mold part 4 protruding at the center and a blank holder around the lower part. The mold part 3 is fixed to the base 2 with bolts 6, and the blank holder 5 surrounding the lower part of the mold part 3 is provided on the lower plate 2 by cushion pins 13, 13 described later so as to be vertically movable. .

A heat-resistant sheet 7 is attached to the mold portion 3 of the male mold 1. A sheet 7 is stuck on the surrounding vertical wall portion 4-2 except for the upper surface 4-1... Of the central mold portion 4. In the embodiment, the mold portion 3 is vertically stepped. Is also formed in a stepped shape, so that the vertical wall portion 4-2 has a large height portion 4-3,
High part 4-4, low part one step outside 4-
5 and so on. The vertical section 4-3, 4-of the central section 4.
A heat-resistant sheet 7 is adhered over the entire peripheral surface of 4, 4-5, and the heat-resistant sheet 7 has a thickness corresponding to the thickness of a product to be press-formed. The upper surfaces 4-1 and 4-6 of the mold portion 3 are non-sticking surfaces of the sheet.
Further, in the embodiment, the surrounding blank holder 5 also forms a part of the mold portion, and the blank holder 5 is provided with a concave portion 5-1 on the upper surface of a portion close to the central mold portion 4, and the vertical wall portion 5- The heat-resistant sheet 7 described above is also adhered to the sheet 2 corresponding to the thickness of the sheet. Upper surface 5-
1 and 5-3 are the non-sticking surfaces of the sheet 7;
Is shown in FIG. The above-mentioned male mold part 3 is formed of cast iron or the like.

The outside of the blank holder 5 around the male mold 1 is surrounded by a mold frame 8, and the mold frame 8 is vertically extended to a level above the central mold section 4. Thus, above and around the male mold part 3, a space constituting the female mold part is formed. In this space, a low melting point material 9, for example, a low melting point metal such as ZAS,
Fill with synthetic resin etc. This is shown in FIG.

Thereafter, the mold 8 is removed, the heat-resistant sheet 7 is peeled off from the mold portion 3 of the male mold 1, and the male mold 1 is used with the sheet 7 removed. The obtained female mold 10 is shown in FIG. 2, and the female mold section 11 corresponding to the male mold section 3 is formed on the female mold 10. In the obtained female mold part 11, the vertical part 11-1 is larger than the vertical part of the central mold part 4 of the male mold part 3 by the above-mentioned heat-resistant sheet 7 in any part. The concave portion 5 is formed smaller than the vertical portion by the thickness of the plate. On the other hand, the inner bottom surface 11-2, 1
Nos. 1-3 and 11-4 are formed so that the heat-resistant sheet is not adhered to the male mold portion 3 and the upper surface of the blank holder 5 when the mold is closed. In the embodiment, a projecting portion 11-5 is formed on the entire bottom surface 11-4. The projecting portion 11-5 has no heat-resistant sheet attached to the bottom of the recess 5-1. The projection 11-5 is formed so as to come into contact with the bottom surface of the recess 5-1 when the mold is closed. The surface of the mold 11 is polished and finished.

The above-mentioned male mold 1 is placed on a base 12 of a press machine via its lower plate 2 as shown in FIG. 5, the mold section 3 is fixed, and the blank holder 5 is attached to the cushion pin 1.
On the other hand, the upper female die 10 has an upper plate 14 fixed on its upper surface with bolts 15 or the like, and the upper plate 14 is attached to and supported by a lifting device such as a ram (not shown). The male mold 1 is a fixed mold, the female mold 10 is a movable mold, the female mold 10 is raised and lowered, and a plate member is formed between the mold parts 4, 5, and 11. In forming by the upper and lower dies 1 and 10, the closing height of the dies 1 and 10 during the press forming operation is set to be higher by the thickness of the plate member W forming the product. That is, in the mold closed state, a gap corresponding to the plate thickness is formed in the vertical wall portions of the mold portions 3, 5, 11, but since the heat-resistant sheet 7 is not attached to the upper surface as described above, Upper mold 11
When the mold is closed with a full stroke, a gap is secured on the side surface, but no gap is generated between the opposing vertical surfaces of the mold portions 4, 5, and 11. Is set so as to increase the closing stroke of the female die 10 corresponding to the thickness of the product.

FIG. 5 shows a state in which a plate material W is formed by the obtained dies 1 and 10, and when the upper die 10 is closed and lowered, the plate thickness including the blank holder 5 between the upper and lower dies 1 and 10 is shown. A considerable gap S is maintained. Thus, the plate material W is the mold 1,
It will be formed into a predetermined shape between the ten.

Next, specific embodiments will be described. A heat-resistant sheet [trade name: Fiber Flux, Toshiba Monoflux] was coated with an adhesive [Coating Cement QF-180 (aerated), manufactured by Toshiba Monoflux] and adhered. Further, the above-mentioned [Coating Cement QF180] was coated on the surface of the heat-resistant sheet, and after drying, the blank holder was surrounded by a mold to create a space for forming a female mold portion. Into this space, ZAS [pour temperature 430 ° C] is injected and filled, and after natural cooling, the mold is dispersed.
The heat-resistant sheet was removed, and the punch and the female mold were polished and finished to obtain a male mold and a female mold. In the example, the FC material was used as the male die [punch], and the female die was formed of the ZAS material. Therefore, the melting points were significantly different, and there was no welding or the like.
Since the mold is formed smoothly, a good mold surface can be obtained particularly with a finish of a degree of polishing.

[0015]

As apparent from the above, according to the present invention,
One is movable and the other is fixed female and male
In the mold for pressing consisting of rudder, the base part is a male part
To the vertical wall except for the top of this male part.
Only the heat-resistant sheet so that it has the same thickness as the product to be molded.
Adhere, then surround the top of the male part with a mold
A space for molding the mold is formed, and a low melting material
To form a female mold part corresponding to the male mold part.
After that, the mold was opened and the above was attached only to the vertical wall of the male mold
Remove the sheet and close both female and male molds vertically.
When a gap corresponding to the product thickness is formed only on the wall
In both cases, the operating height of the mold closing is adjusted by the product plate thickness,
Opposite upper and lower surfaces of both mold parts when closing the mold parts
Between the product and the product plate thickness.
Since, press gold by molding the female by sticking the heat-resistant sheet only the vertical wall portion excluding the top portion of the mold portion of the male
The mold is obtained, and it is not necessary to stick the sheet on the upper surface of the male mold part as in the past, and the sticking work is greatly simplified as compared with the conventional three-dimensional curved sheet sticking. A press die in which a gap necessary for molding is provided between the dies can be obtained easily with a minimum number of man-hours in a short time, and the cost can be greatly reduced.

Further, the upper surface (horizontal plane) can be dealt with only by adjusting the operation stroke in the closing movement of the mold by an amount corresponding to the plate thickness, and can easily cope with a change in the product plate thickness. It is extremely advantageous in terms of production and economy as a mold for production and trial operation.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional side view of mold casting.

FIG. 2 is a longitudinal sectional side view of the obtained female mold.

FIG. 3 is a longitudinal sectional side view of a male mold.

FIG. 4 is a longitudinal sectional side view of a male type to which a heat-resistant sheet is attached.

FIG. 5 is a longitudinal sectional side view of the entire mold, showing a molding state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Male type, 2 ... Base, 3 ... Male type part, 4 ... Center part type part, 5 ... Blank holder, 7 ... Heat resistant sheet, 8
... mold, 9 ... low melting point material, 10 ... female mold, 11 ... female mold part, S ... gap equivalent to product plate thickness, W ... product

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21D 37/20

Claims (2)

(57) [Claims] 1. A While moving, the other female fixed, a male, a press mold made of a blank holder, securing the male part to the base, the portion of the upper surface of the male part To
Forming a space only in the vertical wall portion, and attaching a heat-resistant sheet so that the products and Doatsu to be molded, following Ide, forming the female mold part enclosed in the mold over the male part excluding Then, the space was filled with a low melting point material to form a female mold corresponding to the male mold , and then the mold was opened and affixed only to the vertical wall of the male mold . <Br / > the sheet is removed, female, during mold closing of the male, only the vertical wall portions of both mold portions, to form a gap corresponding to the product thickness, the operation height of the closed upper SL type, Adjust the product thickness equivalent to
When the molds are closed, the upper and lower surfaces
During manufacturing method of a press die, characterized in that to form a gap corresponding to the product thickness, was good Unishi. 2. The method according to claim 1, wherein the male part is made of an iron-based material and the female part is made of a ZAS material.