JP2006116751A - Press-molding device, and press-molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress both width end sections of a work from being drawn into the central section side at the time of press-molding of the band-like work, and to prevent a defective molded article from occurring. <P>SOLUTION: The work 13 comprising two upper and lower sheets 13a and 13b is intermittently fed, and press-molding is performed to the work 13 between an indented die 11 and a protruding die 12 when the intermittent feeding is stopped. On both side sections of the indented die 11, a plurality of teeth 16b forming a waveform as a whole along the work feeding direction are provided in a row. The skin sheet 13a on the upper side is held under a stretched state by clamping by a clamping device 14, and at the same time, both width end sections of the base material sheet 13b on the lower side are set free, and under this state, the press-molding is performed. At the time of the molding, both width end sections of the base material sheet 13b are engaged with the teeth 16b on both side sections of the indented die 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a press molding apparatus and a press molding method used for molding an interior ceiling material of a vehicle such as an automobile.

In the case of molding this type of interior ceiling material, for example, as shown in Patent Document 1, two upper and lower strips of a base material sheet and a skin sheet (which forms the interior side surface of the ceiling material) are used. A workpiece made of a sheet is intermittently fed, and press molding is performed between a concave mold and a convex mold on the workpiece when the workpiece is stopped. In this case, in general, the upper side skin sheet is clamped at both width end portions thereof and held in a stretched state, and the both side width end portions of the lower side base sheet are freed and press molding is performed. To prevent wrinkles and the like from occurring on the skin sheet.
JP-A-53-10180

  Here, at the time of press molding, the base sheet and the skin sheet are squeezed along the concave mold surface. In this case, since both width end portions of the base sheet are in a free state at the time of press molding, the base sheet is drawn to the center part side of both molds. Furthermore, the amount pulled in may be different on the left and right, and therefore, there is a problem that a shift in the width direction and a lack of dimensions occur on one side of the base sheet, and a defective molded product tends to be generated. In particular, when deep drawing press molding is performed, this problem appears remarkably.

  Conventionally, in order to deal with such problems, the operator monitors the press situation to prevent deviation, and the material dimension in the width direction of the base sheet is considered in consideration of the maximum pull-in amount during press molding. And set it large. If it does in this way, naturally, a production cost and material cost cost will become high. Further, if the width dimension of the base sheet is increased, for example, when trimming after pressing, the trimming jig interferes with the end of the workpiece, which makes handling difficult.

  The present invention has been made paying attention to such problems existing in the prior art. Its purpose is to suppress the pulling of both width ends of the work piece to the center of the mold during the press forming of the belt-like work, and to prevent the occurrence of defective molded products as well as the material cost. It is an object of the present invention to provide a press forming apparatus and a press forming method that can reduce the above and the like, and facilitate the handling of a workpiece after pressing.

  In order to achieve the above object, the invention according to claim 1 is a press molding apparatus in which press molding is sequentially performed between a concave mold and a convex mold on a strip-shaped workpiece intermittently fed in one direction. A plurality of teeth having a waveform as a whole along the workpiece feeding direction are arranged on both sides in the concave workpiece feeding direction.

According to a second aspect of the present invention, in the first aspect of the present invention, the teeth are integrally formed on a substrate.
According to a third aspect of the present invention, in the first or second aspect of the present invention, each of the teeth is directed to the front side in the workpiece feeding direction.

The invention according to claim 4 is characterized in that in the invention according to any one of claims 1 to 3, the vertical position of the tooth is adjustable.
The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein when the convex mold moves closer to the concave mold, the convex mold and each tooth The width end of the workpiece is sandwiched between the two.

  The invention according to claim 6 is a press molding method for intermittently feeding a work composed of two upper and lower belt-like sheets and performing press molding between a concave mold and a convex mold on the work when the work is stopped. While clamping the both width | variety edge part and hold | maintaining the strip | belt sheet | seat of an upper side in the tension state, both the width | variety edge part of the strip | belt-shaped sheet | seat of the lower part side was made free of Claims 1-4. Press molding is performed by the press molding apparatus according to any one of the items, and both width end portions of the lower belt-like sheet are engaged with teeth on both sides of the concave mold at the time of molding.

(Function)
In the first aspect of the present invention, when the strip-shaped workpiece is press-molded between the concave mold and the convex mold, both width end portions of the workpiece are engaged with the teeth on both sides of the concave mold to give resistance. . As a result, it is possible to suppress the both width end portions of the workpiece from being pulled toward the center of both molds, prevent the displacement in the width direction of the workpiece and insufficient material width, and generate defective molded products. Can be prevented. In addition, since it is not necessary to set the material dimension in the width direction of the strip-shaped workpiece in consideration of the pull-in amount at the time of press molding, the material cost can be saved and the workpiece does not need to be widened. Handling becomes easy in trimming and the like.

In the invention described in claim 2, a plurality of teeth can be easily arranged in a row on both sides of the concave shape.
In invention of Claim 3, when a strip | belt-shaped workpiece | work is intermittently fed, it can prevent that the both width | variety edge part of the workpiece | work is caught in the tooth | gear of a concave-shaped both sides, and there is a possibility that the feeding of a workpiece | work may be obstructed. Can be prevented.

In the invention according to claim 4, since the height of the teeth can be adjusted, it is possible to effectively cope with the difference in the material of the workpiece.
In the fifth aspect of the invention, since the width end of the workpiece is sandwiched between the convex mold and each tooth prior to pressing, the workpiece can be reliably prevented from shifting in the width direction.

  In the invention described in claim 6, among the work composed of two strip-shaped sheets, both width end portions of the upper strip-shaped sheet are clamped and both width end portions of the lower strip-shaped sheet are made free. In this state, it is possible to prevent both width end portions of the lower belt-like sheet from being drawn into the central portion side of the mold during press molding. Therefore, it is possible to prevent the lower-side belt-like sheet from being press-formed in a state where the upper-side belt-like sheet is displaced in the width direction or the material width is insufficient, thereby suppressing the occurrence of defective molded products. be able to.

  As described above, according to the present invention, it is possible to prevent both width end portions of the workpiece from being drawn into the central portion of the mold during press molding of the strip-shaped workpiece, and suppress the generation of defective molded products. In addition, material costs and production costs can be reduced.

Below, one Embodiment of this invention is described based on FIGS. 1-3.
As shown in FIG. 1, in this press molding apparatus, an upper mold 12 made of a convex mold is opposed to an upper part of a lower mold 11 made of a concave mold so as to be able to approach and separate. Between both the molds 11 and 12, a work sheet 13 composed of two upper and lower skin sheets 13a and a base sheet 13b which is also a belt-like sheet is disposed so as to be intermittently fed in one direction. As shown in FIG. 3, a pair of clamping devices 14 are disposed on both sides in a direction intersecting the workpiece feeding direction of both molds 11 and 12, and this clamping device 14 travels with the workpiece 13 in the workpiece feeding direction. The

  The upper skin sheet 13a is clamped at both width ends by these clamping devices 14, and is intermittently fed to the right in FIG. 1 together with the base sheet 13b. At this time, the base sheet 13b on the lower side is freed without being clamped at both width ends, and is fed in the same direction while being naturally suspended in the lower mold 11. In this state, when the intermittent feed of the work 13 is stopped, the upper mold 12 is moved closer to the lower mold 11 so that the work 13 is press-molded between the two molds 11 and 12, and the molded product 15 is It is formed. After the mold opening at the end of molding, the workpiece 13 is further fed in the same direction from between both molds 11 and 12, and is cut and separated into 15 molded product units in front of both molds 11 and 12, and then each molded product 15 The outer periphery is trimmed on a jig (not shown).

  As shown in FIGS. 2 and 3, a pair of tooth bodies 16 are attached to both sides of the lower mold 11 in the workpiece feeding direction so that the position can be adjusted in the vertical direction by bolts 18 through each pair of elongated holes 17. It has been. Each tooth body 16 includes a substrate 16a and a plurality of teeth 16b that are integrally formed on the upper edge of the substrate 16a so as to form a waveform as a whole along the workpiece feeding direction. Each tooth 16b is formed so as to have a sharp shape, and by making the inclination angles of the front and rear edges different from each other, as shown in FIG. 2, it faces the front side in the workpiece feeding direction. Yes. Further, as shown in FIG. 3, each tooth 16b is formed so that the edge portion 16c protrudes upward on the outer end side in the thickness direction.

  And when the workpiece 13 is press-formed between both molds 11 and 12 as described above, both width end portions of the lower side base sheet 13b are engaged with the teeth 16b of both tooth bodies 16, Resistance in the inward movement direction is applied to both width end portions.

  When the workpiece 13 is formed, first, the bolt 18 is loosened and tightened according to the material of the workpiece 13, and the height of the tooth body 16, that is, the height of the tooth 16b is adjusted. In this state, if the workpiece 13 composed of the skin sheet 13a clamped by the clamping device 14 and the free base sheet 13b without being clamped is intermittently fed, the teeth 16b are directed forward, The base sheet 13b is hardly caught on the teeth 16b.

  Then, when the intermittent feeding is stopped, the upper die 12 is lowered to perform molding. At this time, as shown in FIG. 3, both width end portions of the base sheet 13b of the work 13 try to move inward, so that both width end portions engage with the teeth 16b of the tooth body 16, It can suppress that the both width | variety edge part of the base material sheet 13b is drawn in to the center part side of both type | molds 11 and 12. FIG. In this state, the clamp on the skin sheet 13a is released, and as shown in FIG. 4, both width ends of both sheets 13a and 13b are located between both sides of the upper die 12 and the tooth body 16 immediately before press molding. Sandwiched between. Therefore, the positional relationship between the skin sheet 13a and the base sheet 13b with respect to both the molds 11 and 12 is maintained in a predetermined state, and the base sheet 13b is press-molded in a state in which the base sheet 13b is displaced in the width direction. Can prevent the risk of being lost. Therefore, the molded product 15 can be prevented from becoming a defective product, and monitoring for press molding is also unnecessary. Further, since it is not necessary to set the material dimension in the width direction of the base sheet 13b in consideration of the pull-in amount at the time of press molding, the material cost can be reduced and the width of the base sheet 13b is small. Therefore, the subsequent trimming can be easily performed.

  Furthermore, in this embodiment, since each tooth 16b is formed so as to be directed forward in the workpiece feeding direction, when the workpiece 13 is intermittently fed, both width end portions of the base sheet 13b are teeth 16b. Therefore, it is possible to prevent the possibility of hindering the feeding of the work 13. Furthermore, since the tooth body 16 is attached to the both sides of the lower mold 11 so that the position can be adjusted in the vertical direction, the teeth 16b are engaged with both width end portions of the base sheet 13b prior to the press molding operation. It can be adjusted and arranged easily and surely at the optimum position possible, and can be prevented from being caught during intermittent feeding as described above, and the base sheet 13b can be effectively engaged and held during press molding. Moreover, since both width ends of the workpiece 13 are sandwiched between the upper mold 12 and the tooth body 16 prior to press molding, the displacement of the workpiece 13 can be reliably prevented in combination with the action of the teeth 16b.

Thus, the following effects are exhibited in this embodiment.
-Both side edges of the work 13 can be engaged with the teeth 16b of the tooth body 16, and the work 13 can be prevented from being drawn into the central part of both molds 11 and 12, and molding can be performed without causing misalignment or the like. The product 15 can be prevented from becoming a defective product, and a material with a narrow width can be used, thereby reducing the material cost.

-Since the displacement of the workpiece 13 can be prevented, monitoring during press forming becomes unnecessary, and the production cost can be reduced.
-Since the width of the workpiece 13 can be reduced, interference between the workpiece and the jig can be avoided during trimming, and trimming can be facilitated to reduce the production cost as described above.

-Since the height of the tooth body 16 can be adjusted, the height of the tooth 16b can be set to an optimum state according to the material of the workpiece 13 or the like.
-Since each tooth 16b is directed in front of the workpiece feeding direction, the workpiece 13 can be smoothly fed, and even if the workpiece 13 is soft, it is not easily damaged.
(Example of change)
In addition, this embodiment can also be changed and embodied as follows.

  As shown in FIG. 5, the inclination angles of the front and rear side edges of each tooth 16b of the tooth body 16 are made equal, and each tooth 16b is formed so as to have a substantially triangular mountain shape when viewed from the side. In this case, if the tip of each tooth 16b is slightly rounded, it is possible to effectively prevent catching during workpiece feeding. However, even in this case, it is preferable to stand the outer edge portion 16c as shown in FIG.

-As shown in FIG. 6, it forms so that the edge part 16c may protrude upwards in the center part of the thickness direction of each tooth | gear 16b of the tooth body 16. As shown in FIG.
-As shown in FIG. 7, the upper end of the tooth 16b should be perpendicular to the side surface. Even in this way, the edge portion 16c is formed outside.

Sectional drawing which shows the press molding apparatus of one Embodiment. The perspective view which expands and shows the lower mold | type of the press molding apparatus of FIG. Sectional drawing which expands and shows a part of press molding apparatus of FIG. Sectional drawing which shows the state which clamped the workpiece | work. The partial front view which shows the example of a change of a tooth body. The fragmentary sectional view which shows another modification of a tooth body. The fragmentary sectional view which shows another modification of a tooth body.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Lower mold | type consisting of concave shape, 12 ... Upper mold | type consisting of convex shape, 13 ... Workpiece | work, 13a ... Skin sheet as a strip-shaped sheet, 13b ... Base sheet as a strip-shaped sheet, 14 ... Clamp apparatus, 15 ... Molded article, 16 ... tooth body, 16a ... substrate, 16b ... tooth.

Claims (6)

In a press molding apparatus in which press molding is sequentially performed between a concave mold and a convex mold for a strip-shaped workpiece intermittently fed in one direction,
A press forming apparatus, wherein a plurality of teeth having a waveform as a whole along the workpiece feeding direction are arranged on both side portions in the concave workpiece feeding direction. The press forming apparatus according to claim 1, wherein each tooth is integrally formed on a substrate. The press forming apparatus according to claim 1, wherein each of the teeth is directed to a front side in a workpiece feeding direction. The press molding apparatus according to any one of claims 1 to 3, wherein the vertical position of the teeth is adjustable. 5. The structure according to claim 1, wherein when the convex mold moves closer to the concave mold, the width end portion of the workpiece is sandwiched between the convex mold and each tooth. The press molding apparatus as described in any one of these. In a press molding method of intermittently feeding a work composed of two upper and lower belt-like sheets and performing press molding between a concave mold and a convex mold on the work when the work is stopped,
The upper belt-like sheet is clamped at both width ends and held in a stretched state, and the both width ends of the lower belt-like sheet are left free. A press molding method, characterized in that press molding is performed by the press molding apparatus according to any one of the claims, and both width end portions of the lower belt-like sheet are engaged with teeth on both sides of the concave mold at the time of molding.

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