WRINKLE-PREVENTING BOARD USED FOR PRESS DEVICE

Abstract

A wrinkle removal plate can maintain manufacturing accuracy while significantly reducing costs. A wrinkle removal plate for use in a press machine that molds a workpiece into a drawn product having a desired shape by press molding that uses a pair of molds comprising a first mold provided with a cavity and a second mold provided with a core, wherein the wrinkle removal plate is positioned at corner parts, which are to be drawn, of the opposing surfaces of the cavity and core, and is formed from a plurality of wrinkle removal parts that each have arms extending in two directions along the outer periphery of the corner parts.

Claims

1. A wrinkle-preventing board used for a press device molding a fiber-reinforced resin prepreg into a drawn article having a desired shape by press molding with a pair of upper and lower dies including a first die having a cavity and a second die having a core, comprising more than one wrinkle-preventing board pieces which are each arranged on outside of corner parts of the core, wherein each wrinkle-preventing board piece has a pair of arms extending to be perpendicular to each other and prevents generation of wrinkles on a side wall of the drawn article and break caused by thickness reduction.

2. The wrinkle-preventing board used for the press device according to claim 1, wherein at least one wrinkle-preventing board piece is set so that a pressure for holding the prepreg with the wrinkle-preventing board and one of the dies can be adjusted individually.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG. 1 is a schematic diagram illustrating the drawing device using the wrinkle-preventing board of Example 1.

[0045] FIG. 2 is a schematic diagram illustrating the drawing device using the wrinkle-preventing board of Example 2.

[0046] FIG. 3 is a schematic diagram illustrating an example of the known drawing device.

FORM TO CARRY OUT INVENTION

[0047] Embodiments of the present invention are described below by referencing the drawings of Example in detail.

Example 1

[0048] FIG. 1 is a schematic diagram illustrating the drawing device to which Example 1 of the wrinkle-preventing board used for the press device of the present invention is applied. FIG. 1 (a) is a side view of the drawing device including the first die 100 having the cavity 1 and the second die 200 having the core 2. FIG. 1 (b) is a plan view illustrating the main parts of the second die 200 seen from above without the first die 100 and the workpiece 4 in FIG. 1 (a).

[0049] As seen in a drawing device illustrated in FIG. 3, this drawing device of FIG. 1 and FIG. 2 including a pair of the dies and performs drawing of a prepreg used as a workpiece 4 by raising the core 2 of the second die 200 so as to enter the cavity 1 of the first die 100.

[0050] In Example 1, along the outer periphery of the core 2 of the second die 2, the wrinkle-preventing board pieces 31, 32, 33 and 34 are set at each corner part 30 of the core 2. Namely, in Example 1, the wrinkle-preventing board 3 is constituted by a set of four L-shape wrinkle-preventing board pieces 31, 32, 33 and 34.

[0051] The planer shape of each of the wrinkle-preventing board pieces 31, 32, 33 and 34 is graphically identical or congruent. The shape allows the interchangeable use for each corner. In FIG. 1, for being easily understandable, the wrinkle-preventing board is indicated by hatching coarsely. Because the process of the drawing is the same as that described by referencing FIG. 3, the detailed description of the process is omitted.

[0052] The lengths of the arms extending in two directions perpendicular to each other (the arm extending in the X-axis direction is T1 and the arm extending in the Y-axis direction is T2) along the outer periphery aforementioned of more than one wrinkle-preventing board pieces 31 to 34 of the wrinkle-preventing board 3 are the same in within the area where a pair of dies faces each other on the corner part. In FIG. 1 (b), X.sub.31, X.sub.32, X.sub.33, X.sub.34, Y.sub.31, Y.sub.32, Y.sub.33 and Y.sub.34 satisfy the relationship X.sub.31=X.sub.32=X.sub.33=X.sub.34=Y.sub.31=Y.sub.32=Y.sub.33=Y.sub.34 in the wrinkle-preventing board pieces 31 to 34 on all of four corners, wherein X.sub.31, X.sub.32, X.sub.33 and X.sub.34 are the lengths of the arms extending in the X-axis direction of the wrinkle-preventing board pieces 31 to 34 and Y.sub.31, Y.sub.32, Y.sub.33 and Y.sub.34 are the lengths of the arms extending in the Y-axis direction of the wrinkle-preventing board pieces 31 to 34 respectively. Namely, because the selection need not to be made to determine which one of the wrinkle-preventing board pieces should be arranged for each of four corners, the setting can be easy and quick.

[0053] Note that when the size of the die in the X-axis direction is very different from the size of the die in the Y-axis direction, X.sub.31, X.sub.32, X.sub.33, X.sub.34, Y.sub.31, Y.sub.32, Y.sub.33 and Y.sub.34 may satisfy the relationship (X.sub.31=X.sub.32=X.sub.33=X.sub.34)(Y.sub.31=Y.sub.32=Y.sub.33=Y.sub.34). Also in this case, the wrinkle-preventing board pieces are easily set by determining the direction of the arms by visually observing the shape.

[0054] Each of the wrinkle-preventing board pieces 31, 32, 33 and 34 can be raised and lowered by the telescopic member 5, for example, spring mechanism. Just before the start of raising the second die 200 with the workpiece 4 thereon, the wrinkle-preventing board pieces hold the workpiece 4 on the lower surface of the first die 100, that is, between the lower surface of the first die 100 and the surface of the second die 200 facing the first die 100, which is the same as the wrinkle-preventing board in FIG. 3.

[0055] Note that because the holding pressure exerted by the telescopic member 5 can be adjusted, the optimal holding force can be set in accordance with the shape and the kind of the workpiece 4 and the drawn shape of the molding article.

[0056] Each of the wrinkle-preventing board pieces 31, 32, 33 and 34 may have a shape having arms T1 and T2 which have the same width and extend in the perpendicular direction to each other with the corner part 30 as a middle point along the outer periphery of the core 2 as shown for example, in FIG. 1 (b).

[0057] In manufacturing the wrinkle-preventing board pieces 31, 32, 33 and 34, because all four pieces have the same L-shape, the pieces can be punched out from the board material so that the waste of the material becomes minimum. Thus, the costs of the materials can be reduced greatly.

[0058] Because the whole size of the wrinkle-preventing board pieces 31, 32, 33 and 34 of Example 1 is small as compared with the conventional picture frame-like wrinkle-preventing board 3 which is a single member. The finishing work to achieve the prescribed manufacturing accuracy of the wrinkle-preventing board can be reduced and the cost can be reduced as a whole.

[0059] In Example 1 shown in FIG. 1, the arms in the X-axis direction are as long as the arms in the Y-axis direction. Thus, the wrinkle-preventing board pieces can be punched out from the material efficiently and the cost can be reduced.

[0060] Because the four wrinkle-preventing board pieces 31, 32, 33 and 34 can be set around the core 2 without considering position arrangement of the pieces, the setting work can be very easy.

[0061] As described above, the wrinkle-preventing board 3 of Example 1 can be manufactured at the low cost as well as can be easily handled when putting on the press device as compared with the conventional picture frame-like single member.

Example 2

[0062] FIG. 2 is a schematic diagram illustrating the drawing device to which Example 2 of the wrinkle-preventing board 3 used for the press device of the present invention is applied. FIG. 2 (a) shows a side view and FIG. 2 (b) shows a plan view illustrating the main parts of the second die 200 seen from above without the first die 100 and the workpiece 4 in FIG. 2 (a). Note that the reference codes are the same as FIG. 1.

[0063] In Example 2, the wrinkle-preventing board 3 is preferably used, when the shape of the core 2 of the second die 200 is not simple and the processed article has a complicated two-dimensional shape (the side wall) or a various shape in the depth direction (in the three-dimensional direction). In FIG. 2 (b), the shape of the core 2 is shown by exaggerating the complexity described above to explain. Note that the process of the drawing is also the same as the Example 1.

[0064] Each of the wrinkle-preventing board pieces 31, 32, 33 and 34 of this wrinkle-preventing board 3 is shown to have an X-axis direction arm the length of which is different from a Y-axis direction arm. But at least one of these wrinkle-preventing board pieces 31, 32, 33 and 34 may have an X-direction arm the length of which is different from a Y-axis direction arm and the other wrinkle preventing board pieces may be the same as the wrinkle preventing board pieces in Example 1 described above.

[0065] In Example 2 shown in FIG. 2 by appropriately selecting the length of the arms of the wrinkle-preventing board piece to be set on the corner part corresponding to the complicated shape part of the processed article, the generation of the wrinkles and the cracks can be suppressed or reduced.

[0066] Consequently, in Example 2 by preparing various wrinkle-preventing boards in advance to correspond to the predicted drawn shape of the processed article, the occurrence of the defective products can be suppressed and the processed article of good quality can be manufactured in addition to the advantageous effects in Example 1 aforementioned.

[0067] Note that the wrinkle-preventing board 3 of the present invention is more effective for dies that are relatively large. For example, the length of one side (one of four sides) of the core 2 from the corner to the corner is preferably not less than 1000 mm, more preferably not less than 1500 mm and further preferably not less than 2000 mm.

INDUSTRIAL APPLICATION

[0068] The present invention is described with Examples described above wherein the workpiece 4 is the fiber-reinforced resin material. But the present invention also can be applied for the drawing device for drawing the resin board and the glass composite board which have no fiber as the structure material, the metal board, the resin-metal composite board, the clad metal board and the like as the workpiece.

DESCRIPTION OF CODE

[0069] 1: Cavity [0070] 2: Core [0071] 3: Wrinkle-preventing Board [0072] 31, 32, 33, 34: Wrinkle-preventing Board Piece [0073] 4: Workpiece [0074] 5: Telescopic Member [0075] 6: Pressuring Mechanism [0076] 7: Device Stand [0077] 100: First Die [0078] 200: Second Die