JPH0217253B2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention relates to a mold structure for press working.

(2) Conventional Technology Conventional press molds are generally formed with a hollow interior in order to reduce weight.

(3) Problems to be solved by the invention However, in the past, almost the entire space occupied by the mold in the horizontal plane was hollow, so it was necessary to provide a large number of reinforcing ribs in the hollow part, and it was not possible to sufficiently reduce the weight. has not been achieved.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a mold structure for press working that achieves sufficient weight reduction while ensuring necessary strength.

B. Structure of the Invention (1) Means for Solving the Problems The mold structure according to the present invention includes a bottom plate portion in which a plurality of through holes are formed, and a pair of side plates that are erected in the bottom plate portion facing each other. The base is formed into a hollow closed cross-sectional shape having at least a portion and a pair of sloped surfaces that slope away from each other as they go downward. A molding part having a support frame part formed by connecting a plurality of legs protruding outward from the upper and both sides of the base part by a support plate part at a position where the opening is opened, and having a blade part corresponding to the shape to be processed. is provided on the support frame portion.

(2) Effect According to the above structure, the base is formed smaller than the space occupied by the molded part, and the pressing force acting on the molded part during press processing is distributed and borne by the base and the support frame, and the hollow Sufficient strength can be ensured and weight reduction can be achieved without providing a large number of reinforcing ribs in the base having a closed cross-sectional shape.

(3) Embodiments Below, embodiments of the present invention will be explained with reference to the drawings. First, in FIG. This is a lower trim mold, and includes a base 2, a support frame 3, and a molded part 4 that are integrally formed.

In FIG. 2, the base 2 is formed to have a hollow closed cross-sectional shape. That is, base 2
consists of a bottom plate portion 5, a pair of side plate portions 6, 6, which are erected on the bottom plate portion 5 to face each other, and are inclined so as to approach each other as they move upward from the upper ends of both side plate portions 6, 6. It also consists of a pair of upper plate parts 7, 7 which are connected to each other at their upper ends, and the cross-sectional shape perpendicular to the longitudinal direction thereof is formed to have a hollow closed cross-sectional shape. In the upper part of the base part 2, inclined surfaces 20, 20 are formed by the upper surfaces of the upper plate parts 7, 7, which are inclined in directions that move away from each other as they go downward. Further, collar portions 8, 8 which protrude outward from the side plate portions 6, 6 are connected to both side ends of the bottom plate portion 5.

In FIG. 3, a plurality of through holes 9 are bored in the bottom plate portion 5. As shown in FIG. These through-holes 9 are formed in a rhombic or triangular shape, so that the through-holes 9 form beams that intersect with each other in an X-shape.

Guide blocks 10 are integrally provided at both ends of the base 2 in the longitudinal direction, and a pair of guide post holes 11, 11 are bored in these guide blocks 10, respectively.

The support frame portion 3 has a plurality of legs, for example, three legs 12...
The upper ends of the molded parts 4 are connected by a support plate part 13 having a shape substantially corresponding to the molded part 4. Each leg 12 is formed so as to extend outward from the top and both sides of the base 2 in a plane orthogonal to the longitudinal direction at positions spaced apart from each other in the longitudinal direction of the base 2. 12...
The lower ends of are connected to both flanges 8, 8, respectively.

The molded portion 4 is formed to have a shape corresponding to the outer panel of an automobile body, and has an outer edge portion and
A blade part 1 is attached to the peripheral edge of the opening 14 corresponding to the door.
5 are provided respectively.

Such a mold 1 is cast by a full mold method, and a mold model 16 for casting the mold 1 is as shown in FIG.
The base forming member 17, the support frame forming member 18, and the molding part forming member 19 are bonded to each other with an adhesive, and each of the forming members 17, 18, and 19 is formed of polystyrene foam. The base forming member 17 has a shape corresponding to the base 2 having the guide blocks 10, 10, the support frame forming member 18 has a shape corresponding to the support frame 3, and the molding part forming member 19 has a shape corresponding to the support frame 3. has a shape corresponding to the molded part 4.

A mold 1 having a shape corresponding to the mold model 16 is obtained by burying such a mold model 16 in heat-resistant sand, injecting molten metal, and burning and removing the mold model.

Next, to explain the operation of this embodiment, the mold 1 cooperates with another corresponding mold (not shown) to perform press processing, for example, trim processing, and at that time, the molding part 4 is The applied pressing force acts on the base 2 via the support frame 3. However, since the upper part of the base part 2 is provided with inclined surfaces 20, 20 which are inclined downward on both sides, part of the pressing force is borne by the legs 12 of the support frame part 3. Therefore, the load borne by the base 2 can be kept relatively small, and it becomes unnecessary to provide a large number of reinforcing beams inside the hollow base 2. Further, a load is applied to the molded part 4 to push it apart during press working, and a tensile force is applied to the bottom of the base 2, that is, the bottom plate part 5. However, since the bottom plate part 5 is in the form of a beam, It can effectively withstand the tensile force, and can prevent bending deformation due to unbalanced pressing force during press working.

In such a mold 1, the inside of the base 2 is hollow, and the support frame part 3 is also formed in the form of a framework, so that the overall weight can be reduced and a sufficient weight reduction can be achieved.

By the way, when designing and processing the mold model 16, first the base forming member 17 is designed, the molding part forming member 19 is designed in accordance with the formation of the workpiece to be processed, and then the supporting After designing the frame forming member 18, each forming member 17,1
Since parts 8 and 19 can be processed and formed independently, the design drawing becomes extremely easy to see during processing, and there is less processing required for parts with complex shapes.
Processing time can also be shortened. Furthermore, even when changing the shape of the molded part forming member 19 to some extent, the design drawings of the base forming member 17 and the support frame forming member 18 can be used as they are.

As a modification of the base 2, as shown in FIG. 5, the upper ends of a pair of side plates 6, 6 provided upright on the bottom plate 5 are connected by an upper plate 7' to form a hollow closed cross-sectional shape. A certain base 2' may be constructed, and inclined surfaces 20', 20' may be formed on both sides of the upper surface of the upper plate part 7', and as shown in FIG. The base 2'' has a hollow triangular closed cross-sectional shape by interconnecting the upper ends of the pair of side plate parts 6' and 6'.
, and an inclined surface 2 is formed on the upper surface of each side plate portion 6', 6'.
Furthermore, as shown in FIG. 7, a plurality of rectangular through holes 9' may be formed in the bottom plate part 5' so that the bottom plate part 5' forms a cross-shaped beam. You may do so.

C. Effects of the Invention As described above, the mold structure of the present invention has at least a bottom plate portion in which a plurality of through holes are formed, and a pair of side plate portions that are erected in the bottom plate portion in correspondence with each other. The base is formed into a hollow closed cross-sectional shape and has a pair of sloped surfaces that are inclined in directions that move away from each other as it goes downward. A support frame section is provided in series, in which a plurality of legs protruding outward from the top and both sides are connected by a support plate section, and a molding section having a blade section corresponding to the processing shape is mounted on the support frame section. Since the pressure force during press working is distributed between the base and the support frame, the hollow base is made relatively small to reduce weight and ensure sufficient strength. Can be done.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a perspective view of a mold, FIG. 2 is a cross-sectional view taken along the line -- in FIG. - Line sectional view, Figure 4 is an exploded perspective view of the mold model, Figures 5 to 7 show modified examples of the base, and Figures 5 and 6 correspond to Figure 2, respectively. A sectional view, FIG. 7 is a sectional view corresponding to FIG. 3. 1... Mold, 2, 2', 2''... Base, 3... Support frame part, 4... Molding part, 5, 5'... Bottom plate part, 6,
6'... Side plate part, 9,9'... Through hole, 12... Leg part, 13... Support plate part, 15... Blade part, 20, 2
0', 20''...Slanted surface.

Claims (1)

[Claims] 1 Bottom plate part 5 in which a plurality of through holes 9, 9' are bored,
5', and a pair of side plate parts 6, 6; 6', 6' that stand upright on the bottom plate parts 5, 5' facing each other. has a pair of inclined surfaces 20, 20; 20', 2 which are inclined in directions that move away from each other as they go downward;
0'; base 2, 2', where 20'', 20'' are formed;
2'' is supported by a plurality of legs 12 extending outward from the top and both sides of the bases 2, 2', 2'' at positions spaced apart in the longitudinal direction of the bases 2, 2', 2''. For press working, characterized in that support frame parts 3 connected by plate parts 13 are arranged in series, and a molding part 4 having a blade part 15 corresponding to the working shape is provided on the support frame part 3. Mold structure.