JP3508911B2 - Method and apparatus for chucking raw sheet in press molding - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention will be described in more detail with respect to a method for chucking a raw sheet in press molding and a chucking apparatus. The raw sheet that has been heat-softened is press-formed into a desired shape by a press mold. At this time, the present invention relates to a method for chucking a raw sheet and a chucking device for holding a peripheral edge portion of the raw sheet before mold clamping.

[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 in the center in the longitudinal direction of the vehicle.
a is formed, and an insulator 3 such as a thermoforming felt, a thermoforming bulky nonwoven fabric or the like having excellent sound absorbing properties is generally laminated and integrated on the back surface of the carpet layer 2.

A press method is usually used for molding the floor carpet 1 for a vehicle. After heating and softening a raw sheet of the carpet layer 2 by a heating device, a press mold shown in FIG. 11 is used. It is molded into the desired shape using. At this time, the raw material of the insulator 3 is preset in the molding die, the backing layer on the back surface of the carpet layer 2 is melted in the heating and softening process step, and functions as an adhesive medium between the carpet layer 2 and the insulator 3. .

This press mold comprises a mold upper mold 4 and a mold lower mold 5 which can be opened and clamped with each other. A chucking device for the original sheet is provided so as to apply an appropriate tension to the opposite sheet and prevent wrinkles from occurring.

That is, as shown in FIGS. 11 and 12, an air cylinder 6 is installed on the outer wall of the upper die 4 of the 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 original sheet S of the carpet layer 2 is in a heat-softened state, and the original sheet S is opened when the upper and lower molds 4, 5 of the press mold are opened. After being supplied into the die, the air cylinder 6 is actuated at the same time when the lower die 4 starts to descend, and the chucking pin 8 also descends simultaneously. As shown in FIG. The tip of the chucking pin 8 pierces the raw sheet S immediately before the mold clamping, and the chucking pin 8 holds the peripheral edge of the raw sheet S,
That is, the original sheet S is clamped in a state where tension is applied, and press forming is performed.

[0007]

However, in the conventional chucking device and chucking method, even if the chucking pin 8 is lowered by the operation of the air cylinder 6, as shown in FIG. In some cases, the original sheet S may not be stabbed, and in such a case, the peripheral edge of the original sheet S cannot be held, and the original sheet S is pulled into the mold during press forming, resulting in defective wall thickness. There was a problem.

Further, even if the chucking pin 8 sticks into the peripheral edge of the original sheet S during press molding and the original sheet S is satisfactorily supported, if the stroke adjustment of the air cylinder 6 is not appropriate, Excessive tension is applied to the original sheet S, and as shown in FIG. 15A, the pin holes a of the original sheet S become elongated holes, and the pin holes a drawn inward from the product end line b are torn. Alternatively, as shown in FIG. 15 (b), the intermediate portion of the pin hole a installation point is pulled inward from the product terminal line b, resulting in defective thickness.

Therefore, it is necessary to set the outer dimension of the original sheet S to a large size in consideration of the amount of pulling in the original sheet S, resulting in a decrease in yield and increasing the external dimension of the original sheet S. Even when the setting is made, it is not possible to solve problems such as defective fillet when the pin does not stick and defective pin hole tearing.

An object of the present invention is to reliably chuck and hold the peripheral edge portion of a raw sheet, and to reliably prevent defective molding such as defective thickness or defective pin hole tearing.
A chucking method and a chucking device for a raw sheet in press molding, which is also effective for improving the yield of the raw sheet.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the method for chucking a raw sheet in press molding according to claim 1 is to press a softened raw sheet. In the method of chucking a raw sheet, which holds the peripheral edge of the original sheet before mold clamping when press-molding into a desired shape with a molding die, it is provided on the peripheral edge of the upper die immediately before clamping the upper and lower dies of the forming die. The peripheral edge of the original sheet is pin-held by the chucking pin in the upper chucking portion, and the original sheet is held by the sandwiching plate of the lower chucking portion and the sandwiching plate of the upper chucking portion provided on the peripheral edge of the lower die. Hold the edge of the sheet,
The spring balancing action of the spring which is furnished to the chucking portion of the upper and lower side, and in response to the tensile stress from the raw sheet, independently of the downward movement of the upper die, it is moved vertically up and down side chucking unit Rutotomoni, during the press molding, the raw sheet tea
The tensile force applied to the original sheet causes the
It is characterized in that it is drawn in a direction approaching the sheet forming die to give an appropriate tension to the original sheet.

According to a second aspect of the present invention, in the method for chucking a raw sheet in press molding, when the heat-softened raw sheet is formed into a required shape by a press molding die, the raw sheet is just before clamping. In a chucking device for a raw sheet that holds a peripheral edge of the chucking device, the chucking device includes a long movable member supported by a side wall surface of an upper die of a press mold so as to be vertically movable, and the movable member. A pressing spring that urges the spring downward, a long holding plate that is attached to the lower part of the movable member and holds the original sheet, and is installed at appropriate intervals along the longitudinal direction of the holding plate. And piercing the original sheet, an upper chucking portion having a chucking pin for holding the pin, and correspondingly installed below the movable member in the upper chucking portion,
A slider supported up and down via the LM guide of the support column on the lower die base, a pressing spring for biasing the slider upward in the spring, and a chucking pin receiving hole attached to the upper part of the slider. And a lower chucking portion having a long holding plate for holding the original sheet opened at appropriate intervals.
A holding plate for the upper and lower chucking portions
Is an LM guide and a guide so that it can be contacted and separated from the press mold.
And a slide mechanism consisting of a return spring are installed.
Characterized in that that.

As is apparent from the above structure, according to the method for chucking the original sheet in the press forming according to the first aspect of the present invention, the peripheral edge of the original sheet is pin-held by the chucking pin, and Since the peripheral edge portion of the original sheet is held between the holding plates in the upper and lower chucking portions, it is possible to prevent the pin from sticking to the original sheet and to prevent defective thickness.

Further, the pin is held by the chucking pin and held by the holding plate of the chucking portion, and the spring pressure of the pressing springs installed in the upper and lower chucking portions is balanced and pulled from the original sheet. Since the chucking part moves down independently of the lowering motion of the upper mold according to the stress, excessive tension is not applied to the original sheet, and defective molding such as defective thickness or pin hole tears also occurs. Absent.

Further , the upper and lower chucking portions are pulled in the direction of the press mold by the tensile tension applied to the original sheet, so that an excessive tension is not applied to the original sheet and a more appropriate tension is applied. Can hold the original sheet.

Further, according to the chucking device of the raw sheet in the press molding according to claim 2 of the present invention, the movable member vertically movable, and a pressing spring for spring-loaded downwards so, An upper chucking portion that is attached to the lower part of the movable member and that includes a holding plate having a chucking pin, a slider that can move up and down, a pressing spring that biases the slider upward, and a slider above the slider. It is composed of a lower chucking part that is attached and has a holding plate that has pin receiving holes, and that the chucking pin is not lowered by the operation of a conventional air cylinder. It can be abolished and the troublesome stroke control of the air cylinder can be abolished.

Further , as a chucking device for the original sheet, the upper and lower chucking members are suitable because a sliding mechanism is adopted which can approach the press forming direction according to the tensile stress of the original sheet. Tension can be applied to the original sheet.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a method for chucking a raw sheet and a chucking device in press molding according to the present invention will be described below with reference to the drawings.
1 and 2 are a front view and a cross-sectional view showing an embodiment of a chucking device for a raw sheet in press molding according to the present invention, and FIGS. 3 to 7 show the present invention applied to a method for molding a vehicle floor carpet. FIG. 3 is a sectional view showing a heating process of the original sheet, FIG. 4 is a sectional view showing a setting step of the original sheet, FIG. 5 is an explanatory view showing a chucking start state, and FIG. 6 is an original sheet. Cross-sectional view showing the press molding process of
FIG. 7 is an explanatory view showing the operation of the method of the present invention, and FIGS. 8 and 9 are sectional views showing a second embodiment of the chucking device according to the present invention. The chucking method and the chucking device according to the present invention are applied to the molding of the vehicle floor carpet 1 shown in FIG. 10 of the conventional example.

First, the structure of the chucking device used in the method of the present invention will be described in detail with reference to FIGS. 1 and 2. The press mold includes a lower mold 10 for press molding and an upper mold 20 for press molding, which can be mutually clamped and opened.
The lower die 10 for press molding is installed on the lower die base 11, and the upper die 20 for press molding is configured to be vertically movable by a predetermined stroke by the operation of the lifting cylinder 21. .

Then, the upper and lower molds 20 for press molding,
Although the original sheet is press-formed into a desired shape by 10, the upper and lower molds 20 and 10 for press forming do not have wrinkles by applying an appropriate tension to the original sheet during press forming. A chucking device is installed in the surrounding area. 1 and 2, one side of the upper and lower molds 20 and 10 of the molding mold is illustrated and described, respectively.
Although not shown, similar chucking devices are installed along the remaining three sides of the upper and lower molds 20 and 10 of the mold.
Also, a plurality of chucking devices may be installed separately on one side depending on the shape of the molded product.

The chucking device according to the present invention comprises an upper chucking portion 30 installed on the side wall surface 21 of the upper mold 20 of the press mold and a lower chucking installed around the lower mold 10 of the press mold. And part 40. First, the upper chucking portion 30 is composed of an elongated body having an L-shaped cross section, and a movable member 31 that is vertically movable is installed along the side wall surface 20 a of the upper die 20 for press.

Two support rods 32 are connected to the left and right on the upper surface of the movable member 31.
Is a bracket 33 fixed to the side wall surface 20a of the upper die 20 for press molding by welding, bolting, or the like.
A pressing spring 34 is wound around the outer periphery of the support rod 32 between the movable member 31 and the bracket 33.

Therefore, the movable member 31 is supported by the bracket 33 of the upper die 20 of the press mold so as to be vertically movable via the support rod 32, and the pressing spring 3 is used.
4, the movable member 31 is spring-biased downward.

Further, an elongated holding plate 35 is provided below the movable member 31, and a chucking pin 36 having a sharp tip is appropriately provided on the lower surface of the holding plate 35. Installed at intervals.

On the other hand, the lower chucking portion 40 has a cross section L.
An LM guide 43 of a support strut 42 in which a slider 41 composed of a letter-shaped elongated body is erected on the lower mold base 11.
It is installed so that it can move up and down. A guide rod 44 is fixed to the lower surface of the slider 41, the guide rod 44 is guided into the guide post 44a, and a pressing spring 45 is wound around the outer circumference.
The pressing spring 45 is inserted between the lower die base 11.

Therefore, like the movable member 31 described above,
The slider 41 is also slidable in the vertical direction by the LM guide 43 of the support column 42 and the guide rod 44, and is constantly biased upward by the pressing spring 45.

Further, the slider 41 is also provided with an elongated holding plate 46, and the holding plate 46 is provided with a pin receiving hole 47 at a position corresponding to the chucking pin 36. . The slider 41 is provided with a reinforcing rib 41a to ensure a desired rigidity, and the slide portion 41b is provided to the LM guide 4.
It is the structure which slides along 3 and.

Next, the molding process of the floor carpet 1 for a vehicle using the upper and lower molds 20 and 10 for press molding equipped with the chucking device will be sequentially described. First,
As shown in FIG. 3, the raw fabric sheet S is heated and softened to a predetermined temperature. The raw fabric sheet S is a material for the carpet layer 2 and has a polyethylene resin backing layer on its back surface.

Then, the original sheet S is heated by the heating device 50.
After the heating and softening treatment by, as shown in FIG. 4, when the upper and lower molds 20 and 10 for press molding are in the mold open state, the original sheet S is set in the mold. The original sheet S
In addition, a clamp device 51 for clamping the peripheral edge is installed for carrying to the heating step and the setting step shown in FIG. 4, and the raw material of the insulator 3 is set in advance in the lower die 10 for press molding.

When the setting of the original sheet S shown in FIG. 4 is completed, as shown in FIG. 5, the upper die 20 for press forming starts the lowering operation by the operation of the lifting cylinder 21, and the original sheet S is pressed. Chuck the periphery. That is, the movable member 31 in the upper chucking portion 30 also descends by the same stroke in response to the lowering stroke of the upper die 20 for press molding, and the upper chucking portion 30 is inserted into the pin receiving hole 47 of the lower chucking portion 40. The chucking pin 36 enters. At this time, the raw sheet S is pierced by the chucking pin 36 having a sharp tip, the raw sheet S is chucked by the chucking pin 36, and the holding plate 3 in the upper and lower chucking portions 30 and 40 is held.
The original sheet S is held between 5,46. The clamp device 51 is released immediately before the original sheet S is chucked.

Therefore, unlike the conventional case, the chucking pin does not pierce the original sheet to cause defective thickness, and the peripheral edge portion of the original sheet S is held by the chucking pin 36 and the upper and lower holding plates 35, 35. It can be reliably held between the rollers 46, and the original sheet S is not excessively drawn into the mold during press molding.

Then, with the original sheet S being securely chucked, as shown in FIG. 6, the lowering operation of the upper die 20 for press molding continues, and the upper die 2 for press molding is continued.
0 descends to the bottom dead center, and the original sheet S is press-formed into a required shape. At this time, the upper chucking portion 30
The movable member 31 in (1) follows the lowering movement of the upper die 20 for press molding against the spring pressure of the pressing spring 34 and performs the lowering movement.

Since the spring pressure of the pressing spring 45 provided on the lower chucking portion 40 is applied to the upper chucking portion 30, the descending stroke of the upper chucking portion 30 is the same as that of the upper die 20 for press molding. It is not the same as the descending stroke, and is appropriately determined depending on the balancing action of the spring pressure of the pressing springs 34 and 45 and the tension from the original sheet S.

Therefore, as shown in FIG. 7, the chucking portion of the original sheet S after the completion of the molding is the product terminal line b.
There is no flesh or tear in the pin hole a inside the
Since it is only necessary to set the chucking allowance d for the minimum size, the yield of the original sheet S can be significantly improved. The carpet layer 2 is formed into a desired shape by forming the original sheet S, and the original sheet of the insulator 3 set in advance in the lower die 10 for press forming is bonded to the backing layer on the back surface of the carpet layer 2. They are integrated by the action, and the molding of the vehicle floor carpet 1 is completed.

As described above, according to the method of the present invention, when the original sheet S is chucked, in addition to the pin holding by the chucking pin 36, the upper and lower chucking portions 30, 4 are provided.
The original sheet S is sandwiched between the holding plates 35 and 46 at 0.
Since the pin hole a of the original sheet S is not deformed into a long hole shape due to excessive stress (defects in tearing), the peripheral edge portion of the original sheet is sandwiched, and
The terminal portion of the original sheet S will not be excessively drawn into the mold, resulting in defective thickness.

Further, since the chucking pin is not operated by an air cylinder or the like as in the conventional case, the air cylinder can be eliminated, and the troublesome work such as precise stroke adjustment of the air cylinder is not required, so that the press molding can be performed. The upper and lower chucking members 30, 40 are lowered in conjunction with the lowering operation of the upper die 20, and the pressing springs 34,
Since an appropriate chucking position can be obtained according to the balancing action of the spring pressure of 45 and the tension from the original sheet S, the structure is inexpensive and the management is easy.

Next, FIGS. 8 and 9 show a second embodiment of a chucking device for a raw sheet S in press molding according to the present invention. Further improvements are made to the first embodiment. The appropriate tension is applied to the original sheet S during press molding.

That is, a separate holding plate 35 is provided on the lower side of the movable member 31 in the upper chucking portion 30 so that it can be moved forward and backward toward the upper die 20 side for press molding.
It is configured to be installed via the M guide 37, and at the same time, a return spring 38 is installed on the holding plate 35.

Correspondingly, the lower chucking portion 40 also has an LM guide on the upper side of the slider 41 so that a holding plate 46 can be moved back and forth toward the lower die 10 side of the press mold. It is attached via 48, and a return spring 49 is installed.

As described above, in the chucking device having the slide mechanism in the direction of the upper and lower molds 20 and 10 for press molding, as shown in FIG. When excessive tension is applied from the opposite sheet S, the upper and lower chucking portions 30 and 40 hold the sandwiching plates 35 and 46 while sandwiching the peripheral edge portion of the original sheet S. 20, 10
Since it operates so as to approach the side, more appropriate tension is applied, and it is possible to more effectively solve defects such as lack of wall thickness and deformation due to excessive tension, and to reduce the chucking allowance of the original sheet S. It can be set to a smaller number and the material can be effectively used.

The embodiment described above can be effectively applied to interior materials such as insulator dash and molded ceiling, and the chucking method and chucking device according to the present invention can be widely applied.

[0042]

The above is the method and apparatus for chucking a raw sheet in press molding according to the present invention. According to the method for chucking a raw sheet in press molding according to claim 1 of the present invention. As a method for chucking the original sheet when pressing the original sheet,
With the structure of holding the pin by the chucking pin and holding the peripheral edge of the original sheet between the holding plates, the chucking pin does not pierce the original sheet as in the past and the holding becomes poor, and the original sheet is not held. Since the end portion is not pulled into the mold and the peripheral portion of the original sheet can be reliably chucked, defective molding can be reliably prevented, and moldability can be improved.

During press forming of the original sheet, the peripheral edge of the original sheet is held by chucking pins, and the original sheet is held while being held between the holding plates, separately from the lower die stroke. Since the upper and lower chucking members are moved up and down by using the balance action of the spring member to give an appropriate tension to the original sheet, there is no possibility of forming defects such as wrinkles. In addition, it is possible to reliably prevent defective molding such as lack of wall thickness and tearing of pin holes, and greatly improve moldability.

[0044] Also during flop press forming, while sandwiching the raw sheet by pinching plate for chucking pin and the chucking member, the raising and lowering operation of the chucking member, press-molding the tensile stress from the material sheet Since it is slidable so as to be appropriately brought close to the mold, an appropriate tension can be applied to the original sheet during press forming, and a chucking margin can be set to be smaller, which contributes to improvement in yield.

[0045] According to the chucking device of the raw sheet in the press molding according to claim 2, as a chucking device of original sheet at the time of the original anti sheet pressing, holding pins a peripheral portion of the material sheet A chucking pin, a holding plate for holding the peripheral portion of the original sheet, and a lowering spring for controlling the vertical movement of the upper and lower chucking portions independently of the lowering movement of the upper die are provided, and Since the chucking position of the original sheet is determined based on the equilibrium action of the spring pressure of the pressing spring and the tensile stress from the original sheet, the conventional air cylinder for operating the chucking pin can be abolished. It is possible to eliminate troublesome work such as stroke control of the air cylinder, achieve a low-priced structure, and easily manage the chucking operation. And accurately carried out.

Further, as a chucking device for the original sheet when the original sheet is pressed, a holding mechanism for holding the peripheral edge of the original sheet is provided with a slide mechanism capable of moving forward and backward toward the press mold. Therefore, the tension applied to the original sheet can be adjusted more appropriately, and the chucking allowance can be reduced, which leads to material saving.

[Brief description of drawings]

FIG. 1 is a front view showing a press mold of a raw sheet chucking device in press molding according to the present invention.

FIG. 2 is a cross-sectional view of a raw sheet chucking device in press molding according to the present invention.

FIG. 3 is a cross-sectional view showing a step of heating a raw sheet in which the method for chucking a raw sheet in press molding according to the present invention is applied to a method for manufacturing a floor carpet for a vehicle.

FIG. 4 is a cross-sectional view showing a process for setting a raw sheet in which the method for chucking a raw sheet in press molding according to the present invention is applied to a method for manufacturing a floor carpet for a vehicle.

FIG. 5 is a cross-sectional view showing a state at the start of chucking in which the method for chucking a raw sheet in press molding according to the present invention is applied to a method for manufacturing a floor carpet for a vehicle.

FIG. 6 is a cross-sectional view showing a press molding process in which the method for chucking a raw sheet in press molding according to the present invention is applied to a method for manufacturing a vehicle floor carpet.

FIG. 7 is an explanatory diagram showing a molded product after molding when the method for chucking a raw sheet in press molding according to the present invention is applied to a method for manufacturing a floor carpet for a vehicle.

FIG. 8 is a sectional view of essential parts showing a different embodiment of a method for chucking a raw sheet and a chucking device in press molding according to the present invention.

9 is a cross-sectional view showing a sliding state in the press molding die direction in the chucking device shown in FIG.

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

FIG. 11 is a front view showing a press mold in which a conventional chucking device is installed.

FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 11, showing a press molding die in which a conventional chucking device is installed.

FIG. 13 is a cross-sectional view showing a state where a raw sheet is held by a conventional chucking device.

FIG. 14 is a sectional view showing a defect of a conventional chucking device.

FIG. 15 is an explanatory view showing a defective molding caused by a problem of the conventional chucking device.

[Explanation of symbols]

1 Vehicle floor carpet 2 carpet layers 3 insulators 10 Lower mold for press molding 11 Lower mold base 20 Upper mold for press molding 21 Lifting cylinder 30 Upper chucking part 31 Movable member 32 Support rod 33 bracket 34 Pressing spring 35 Holding plate 36 chucking pins 37 LM Guide 38 Return spring 40 Lower chucking part 41 Slider 42 Support post 43 LM Guide 44 Guide rod 45 Spring for pressing 46 Holding plate 47 pin receiving hole 48 LM Guide 49 Return spring 50 heating device 51 Clamp device S original sheet a pin hole b Product terminal line d chucking fee

Claims (2)

(57) [Claims] 1. A method for chucking a raw sheet, comprising holding a peripheral edge of the raw sheet before clamping, when press-molding the heat-softened raw sheet into a desired shape by a press molding die. Just before clamping the upper and lower molds, the chucking pin in the upper chucking part provided on the peripheral part of the upper mold holds the peripheral part of the original sheet by pins, and for holding the lower chucking part provided on the peripheral part of the lower mold. The upper edge of the original sheet is held by the plate and the holding plate of the upper chucking section, and the spring equilibrium of the springs installed in the upper and lower chucking sections and the tensile stress from the original sheet cause independently of the downward movement of the mold, the upper and lower chucking unit is vertically operating Rutotomoni, press forming, raw
The seat chucking section applies tension to the original sheet.
A method for chucking a raw sheet in press molding , which is pulled by a force in a direction approaching a press mold to give an appropriate tension to the raw sheet. 2. A chucking device for a raw sheet, which holds a peripheral edge of the raw sheet immediately before mold clamping when the heat-softened raw sheet is formed into a desired shape by a press molding die. Is a long movable member supported on the side wall surface of the upper die of the press mold so as to be movable up and down, a pressing spring for biasing the movable member downward in the spring, and attached to the lower portion of the movable member. An upper side provided with a long holding plate for holding the original sheet, and a chucking pin which is installed at appropriate intervals along the longitudinal direction of the holding plate, pierces the original sheet, and holds the pin. The chucking portion and the LM of the support column provided correspondingly below the movable member in the upper chucking portion and on the lower die base.
A slider supported up and down via a guide,
A pressing spring for urging the slider upwardly and a long holding plate for holding the original sheet attached to the upper part of the slider and having chucking pin receiving holes opened at appropriate intervals are provided. And a lower chucking portion provided with the lower chucking portion.
The gripping plate can be contacted with and separated from the press mold.
Slide consisting of LM guide and return spring
An apparatus for chucking a raw sheet in press forming, which is equipped with a mechanism .