JPH11221849A - Apparatus for chucking rolled sheet in press molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve moldability by preventing a rolled sheet from entering a chucking pin deeply and applying proper tension to the sheet and to facilitate a demolding operation. SOLUTION: In a chucking device 30 fitted along the side wall surface of an upper mold 20 for press molding, chucking pins 34 turned downward are attached at prescribed pitch intervals to a support plate 33 driven vertically by an air cylinder 31, stopper plates 35 are inserted into the chucking pins 34 to be fixed. The sticking quantity of the pins 34 into a rolled sheet S is regulated by the stopper plates 35, proper tension is applied to the sheet S, the setting positions of the stopper plates 35 are adjusted optionally, and the tension applied to the sheet S is adjusted to improve moldability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for chucking a raw sheet in press forming. More specifically, the present invention relates to an apparatus for chucking a heat-softened raw sheet into a required shape by press forming immediately before clamping. The present invention relates to a device for chucking a raw sheet in press forming for holding a peripheral portion of the raw sheet.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, a vehicle floor carpet 1 laid on a floor panel of a vehicle has a tunnel portion 1 extending centrally along the longitudinal direction of the vehicle.
a is formed, and an insulator 3 having excellent sound absorbing properties such as a thermoforming felt, a thermoforming bulky nonwoven fabric, or the like is usually laminated and integrated on the back surface of the carpet layer 2.

[0003] A press method is usually used for molding the floor carpet 1 for a vehicle. After a raw sheet of the carpet layer 2 is heated and softened by a heating device, a press molding die shown in FIG. Used to form the desired shape. At this time, the raw material of the insulator 3 is set in the molding die in advance, and the backing layer on the back surface of the carpet layer 2 is in a molten state in the heat softening process, and functions as an adhesive medium between the carpet layer 2 and the insulator 3. .

[0004] The press mold comprises an upper mold 4 and a lower mold 5 which can be opened and fastened to each other. A chucking device for the original sheet is provided so that an appropriate tension is applied to the opposite sheet and wrinkles and the like do not occur.

More specifically, as shown in FIGS. 11 and 12, an air cylinder 6 is provided on the outer wall of the upper die 4 of a molding die, and a support plate 7 is fixed to a piston rod 6a of the air cylinder 6. On the lower surface of the support plate 7, chucking pins 8 having sharp tips are provided at appropriate intervals.

When the floor carpet 1 for a vehicle is press-molded, the raw sheet S of the carpet layer 2 is in a heat-softened state, and as shown in FIG. After the upper mold 4 is supplied into the mold when the mold 5 is opened, the air cylinder 6 operates simultaneously with the lowering operation of the upper mold 4 and the chucking pin 8 also descends, so that the tip of the chucking pin 8 projects into the raw sheet S. Press forming is performed in a state where the peripheral edge of the raw sheet S is held by the piercing and chucking pins 8, that is, in a state where the raw sheet S is given an appropriate tension.

[0007]

However, in the conventional chucking device, the operation of the air cylinder 6 causes the chucking pins 8 to move down, and the original sheet S
But this chucking pin 8 is usually 10mm
It may have front and rear dimensions and may pierce deeply near the base of the chucking pin 8. In such a case, the raw sheet S
At the time of press forming, it has been pointed out that an appropriate tension is not applied to the raw sheet S, which causes surface defects such as wrinkles. There is also a problem that stress concentrates and defects such as tearing of pin holes are likely to occur.

Further, when the molded product is released from the mold after the press forming of the raw sheet S, if the peripheral edge portion of the raw sheet S is deeply pierced into the chucking pins 8, it is very difficult to remove the molded product. It was pointed out at the same time that the operation was troublesome and the removal operation was troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to easily cope with the shape of an interior material, to prevent excessive sticking of a chucking pin, to reliably prevent molding defects such as generation of wrinkles and tearing of a pin hole, and to perform demolding operation. The present invention also provides an apparatus for chucking a raw sheet in press forming, which can be performed smoothly.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an apparatus for chucking a raw sheet in press molding according to the first aspect of the present invention is to press the raw sheet that has been subjected to heat softening treatment. When forming into a required shape by molding, in a chucking device that holds the peripheral edge of the raw sheet immediately before clamping, the chucking device is driven up and down by a cylinder fixed to the side wall of the upper die of the press forming die. A supporting plate, a chucking pin having sharp tips provided at appropriate intervals downward from the lower end of the support plate, and a stopper plate that can be fixedly inserted into and fixed to the plurality of chucking pins while being fixed. The stopper plate regulates the piercing dimension of the chucking pin at the peripheral edge of the raw sheet by the stopper plate. It is characterized in.

According to the present invention, since the stopper plate is inserted into the plurality of chucking pins and the stopper plate is fixed by bolts or the like at appropriate insertion positions, the chucking is performed by the stopper plate when chucking the raw sheet. An appropriate tension can be applied to the raw sheet during press forming of the raw sheet without the raw sheet being stabbed deep into the root of the kingpin.

Further, not only can the sticking of the raw sheet into the chucking pins be prevented, but also a part of the tension applied to the raw sheet is received by the stopper plate. Can be prevented beforehand.

Further, since the raw sheet is not deeply stabbed into the chucking pins by the stopper plate, the raw sheet can be easily removed from the chucking pins even when the molded article is released from the mold after molding.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an apparatus for chucking a raw sheet in press forming according to the present invention. FIG. 1 is a front view showing the entire configuration of a press mold provided with a chucking device, and FIG.
Is a front view showing the configuration of the chucking device according to the present invention,
FIG. 3 is a perspective view showing the configuration of the chucking device, and FIGS.
FIG. 5 is a sectional view showing a configuration of the chucking device. 6 to 9 show the steps of forming a raw sheet using a press mold using the chucking device according to the present invention. FIG. 6 shows a heat treatment step of the raw sheet, and FIG. FIG. 8 is a cross-sectional view illustrating a setting step of the sheet, FIG. 8 is a chucking step of the sheet, and FIG. The chucking device according to the present invention is applied to the molding of a conventional floor carpet 1 for a vehicle shown in FIG.

First, a schematic configuration of a press mold and a chucking device will be described with reference to FIGS. 1 to 5. As shown in FIG.
Lower mold 10 for press forming that can be mutually closed and opened
And upper mold 20 for press molding, and upper mold 2 for press molding
And a chucking device 30 provided at the first position.

More specifically, the lower mold 10 for press molding is used.
Has a molding surface conforming to the back surface shape of the vehicle floor carpet 1 and, as shown in FIG. 5, the raw sheet receiving plate 11 is fastened by bolts 13 via spacer pipes 12 along the peripheral edge. Fixed. The raw sheet receiving plate 11 is divided and installed in accordance with the shape of the lower die 10 for press forming.

On the other hand, the upper die 20 for press molding, which is located above the lower die 10 for press molding, can be moved up and down by a predetermined stroke by a lifting cylinder (not shown). And a chucking device 30 is installed on the side wall surface 21 of the upper die 20 for press molding. This chucking device 30 will be described with reference to an embodiment in which the molding die shown in FIG. 1 is provided on one side surface of an upper die 20 for press molding. Is provided.

The structure of the chucking device 30 is divided and installed in accordance with the shape of the molded product. The structure of one block will be described in detail with reference to FIGS. An air cylinder 31 and a guide block 32 are attached to a side wall surface 21 of the air cylinder 20, and a support plate 33 made of a long plate having an L-shaped cross section is attached to a piston rod 311 of the air cylinder 31.
2 is attached to the vertical portion 331 of the support plate 33 from its lower end toward the lower end 34.
A chucking pin 34 having a sharp 1 is fixed at an appropriate pitch interval.

The horizontal portion 332 of the support plate 33
, A guide rod 321 is integrated upward, and when the guide rod 321 is inserted into the guide hole 322 of the guide block 32, the support plate 33 is smoothly moved up and down by the operation of the air cylinder 31. It is configured to be.

Furthermore, the side wall surface 2 of the upper die 20 for press molding
Also in FIG. 1, as shown in FIGS. 3 and 5, the cover plate 22 is fixed by bolts 24 via spacer pipes 23.

The chucking pins 34 fixed to the support plate 33 are provided at a pitch of 50 mm in the present embodiment, and in particular, in the present invention, the amount of piercing of the raw sheet S can be regulated. As described above, the stopper plate 35 is inserted into the chucking pin 34, and the stopper plate 35 is fixed at a predetermined position by the nuts 351 and 352 inserted into the upper and lower sides of the stopper plate 35.

Therefore, while the total length d of the chucking pin 34 is 80 to 100 mm, the amount of the chucking pin 34 pierced into the raw sheet S is the dimension indicated by d1 in the figure, and the nuts 351 and 352 are shown. And adjust the stopper plate 35 in the up-down direction.
By tightening 1,352, this d1 dimension can be adjusted appropriately.

The vertical portion 331 of the support plate 33 is provided with an escape opening 333 for allowing the spacer pipe 23 of the cover plate 22 to escape when the support plate 33 moves down when the air cylinder 31 operates. I have.

As described above, the chucking device 30 according to the present invention employs a configuration in which the stopper plate 35 that is inserted into and fixed to the chucking pin 34 is provided, and the installation position of the stopper plate 35 can be adjusted to an arbitrary position in the vertical direction. Hereinafter, the operation of the chucking device 30 in the press forming of the raw sheet S will be described with reference to FIGS.
It will be described based on.

First, as shown in FIG. 6, the raw sheet S is heated and softened to a predetermined temperature.
It is a material of the carpet layer 2 and has a backing layer made of polyethylene resin on the back surface.

Then, the raw sheet S is heated by a heating device 40.
After the heat softening treatment, the raw sheet S is set in the mold when the upper and lower dies 20, 10 for press molding are in the mold open state as shown in FIG. The raw sheet S is provided with a clamp device 41 that clamps the peripheral edge thereof in order to be conveyed to the heat softening process shown in FIG. 6 and the setting process shown in FIG. 7, and the clamp device 41 is used for press forming. It is positioned so as to be located outside the raw sheet receiving plate 11 provided on the peripheral edge of the lower mold 10. The raw material of the insulator 3 is set in the lower mold 10 for press molding in advance.

When the setting operation of the raw sheet S shown in FIG. 7 is completed, as shown in FIG. 8, the upper die 20 for press molding starts to descend by the operation of the elevating and lowering cylinder. The chucking device 30 operates before the upper die 20 reaches the bottom dead center.

That is, the operation of the air cylinder 31 causes the support plate 33 to move down, so that the support plate 3
Since the plurality of chucking pins 34 screwed into 3 are lowered and the tips 341 of the chucking pins 34 are sharp, the raw sheet S is easily pierced. At this time,
The amount of sticking of the chucking pin 34 is regulated by the stopper plate 35, and the original sheet S is held at the installation point of the stopper plate 35.

Then, as shown in FIG.
The upper die 20 for press molding is lowered to the bottom dead center in a state in which the peripheral edge of is chucked by the chucking device 30, and press molding is performed. At this time, the air cylinder 31 also descends with the same stroke as the lowering operation of the upper die 20 for press molding, and the chucking pin 34 is inserted into the peripheral portion of the raw sheet S by a predetermined size.
Therefore, during the press forming of the raw sheet S, an appropriate tension is applied to the raw sheet S, and generation of wrinkles and the like is suppressed as much as possible, and formability can be improved.

By forming the raw sheet S, the carpet layer 2 is formed into a required shape, and the raw material of the insulator 3 set in the lower mold 10 for press molding is backed on the back of the carpet layer 2. The layers are integrated by the bonding action, and the molding of the floor carpet 1 for a vehicle is completed.

Further, the tensile stress applied to the peripheral portion of the raw sheet S during press forming of the raw sheet S does not concentrate on the pin holes of the raw sheet as in the prior art, and a part of the tensile stress is reduced by the stopper. Since it is applied to one side edge of the plate 35, defects such as tearing of a pin hole can be prevented, and the moldability is significantly improved, and after press molding, the molded product is released after the upper mold 20 of the press mold is opened. At this time, the amount of piercing of the chucking pins 34 piercing the raw sheet S is regulated by the stopper plate 35, and since the piercing amount is small, the work of removing the raw sheet S from the chucking pins 34 can be easily performed. And the removal workability can be improved.

Further, a stopper plate 3 installed on the chucking plate 34 depending on the shaping shape of the vehicle floor carpet 1 or the difference in the degree of expansion and contraction of the raw sheet S.
5 can be arbitrarily adjusted along the vertical direction, and an appropriate chucking position can be selected according to the shape of the vehicle floor carpet 1 and the specifications of the material to be used.

In the embodiment described above, the chucking device according to the present invention is applied to the press forming method of the floor carpet 1 for a vehicle. However, the present invention is also effectively applied to interior materials for automobiles such as an insulator dash and a molded ceiling. Applicable.

[0034]

The embodiment of the apparatus for chucking a raw sheet in press forming according to the present invention has been described above.
According to a first aspect of the present invention, there is provided an apparatus for chucking a raw sheet in press forming, wherein a stopper plate is inserted and fixed to a plurality of chucking pins, and the amount of sticking of the chucking pin into the raw sheet by the stopper plate is adjusted. Therefore, the original sheet does not enter deeply into the base of the chucking pin as in the past, and during press forming, the optimal tension can be applied to the original sheet, wrinkles and the like occur, and molding defects This effectively solves the problem of causing a wrinkle or the like, and a good molded product without wrinkles or the like can be formed.

Further, a stopper plate is inserted and fixed to a plurality of chucking pins, and the amount of piercing of the chucking pins into the raw sheet is adjusted by the stopper plate. The tensile stress applied to the anti-sheet is not concentrated in the pin holes of the source sheet, and the stopper plate can receive the tensile stress applied to the source sheet, resulting in problems such as tearing of the pin holes and deformation of the pin holes. In addition, molding defects can be prevented beforehand, and molding accuracy can be improved.

Furthermore, since the amount of piercing of the chucking pin into the raw sheet is adjusted by the stopper plate, the raw sheet does not penetrate deeply into the root of the chucking plate, and is pierced by the stopper plate. The amount can be set small, and the molded product can be easily removed from the chucking pin at the time of demolding of the molded product after press molding, and the demolding workability can be improved.

Further, since the amount of the chucking pin pierced into the raw sheet is adjusted by the stopper plate, the stopper is taken into consideration in consideration of the molding shape of the interior material and the elasticity of the raw sheet to be used. By appropriately adjusting the installation position of the plate in the vertical direction, it is possible to effectively cope with the shape of the interior material and the material of the raw material to be used.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire configuration of a press forming die provided with a device for chucking a raw sheet in press forming according to the present invention.

FIG. 2 is a front view showing an embodiment of a raw sheet chucking device in press molding according to the present invention.

FIG. 3 is a perspective view showing an embodiment of an apparatus for chucking a raw sheet in press forming according to the present invention.

FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3, illustrating an embodiment of a device for chucking a raw sheet in press forming according to the present invention.

FIG. 5 is a cross-sectional view taken along line V-V in FIG. 3, showing an embodiment of a device for chucking a raw sheet in press forming according to the present invention.

FIG. 6 is a cross-sectional view showing a step of heating the raw sheet in the method of manufacturing a floor carpet for a vehicle using the press mold shown in FIG.

FIG. 7 is a cross-sectional view showing a process of setting a raw sheet in a method of manufacturing a floor carpet for a vehicle using the press mold shown in FIG. 1;

FIG. 8 is a cross-sectional view showing a step of chucking the raw sheet in the method for manufacturing a floor carpet for a vehicle using the press mold shown in FIG. 1;

9 is a cross-sectional view showing a press forming step in a method of manufacturing a floor carpet for a vehicle using the press forming die shown in FIG.

FIG. 10 is an external view showing a conventional vehicle floor carpet.

FIG. 11 is a front view showing a press forming die provided with a conventional chucking device.

FIG. 12 is a front view showing a configuration of a conventional chucking device.

FIG. 13 is a cross-sectional view showing a molding step using a conventional press mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor carpet for vehicles 2 Carpet layer 3 Insulator 10 Lower die for press molding 11 Plate for raw material sheet 20 Upper die for press molding 21 Side wall surface 30 Chucking device 31 Air cylinder 33 Support plate 34 Chucking pin 35 Stopper plate 40 Heating device 41 Clamping device S Raw sheet

Claims (1)

[Claims] 1. A chucking device for holding a peripheral portion of a raw sheet immediately before mold clamping when a heat-softened raw sheet is formed into a required shape by press molding. A support plate driven up and down by a cylinder fixed to the side wall of the upper die, a chucking pin having a sharp tip provided at an appropriate interval downward from the lower end of the support plate,
A press plate which is inserted and fixed to a plurality of chucking pins and has a stopper plate capable of changing its fixing position, wherein the piercing dimension of the chucking pins at the peripheral edge of the raw sheet is regulated by the stopper plate. Device for chucking raw sheet in molding.