JP2001187412A - Clamping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamping device capable of sufficiently exhausting blowing gas in a mold by a simple structure. SOLUTION: A clamping device is provided wherein a fixed component 11 provided to one side of a top force 21 or a bottom force 22 and a movable component 12 provided to the other side of the top force 21 or the bottom force 22 are provided, and the top force 21 and the bottom force 22 are mutually clamped by engaging the movable component 12 with the fixed component 11. The fixed component 11 is equipped with a first engaging part 11a wherein the top force 21 is engaged with the bottom force 22 when the movable component 12 is engaged, and a second engaging part 11b wherein the top force 21 and the bottom force 22 are held via a clearance between them by engaging the movable component 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping device, and more particularly to a clamping device for a metal mold for clamping a foaming mold used for molding a synthetic resin foam such as an automobile seat or interior material. .

[0002]

2. Description of the Related Art Conventionally, metal or resin molds have been used to manufacture automobile seats and interior materials, and for example, a polyurethane foam material is filled into the molds and foamed. There is known a method of forming the same.

[0003]

When the foam is molded as described above, when the foam is removed from the mold,
The clamp device that clamps the upper mold and the lower mold of the mold is released, but at this time, a number of problems described below have occurred.

For example, as shown in FIG. 4, a configuration is known in which an upper die and a lower die are clamped by a toggle clamp device 101. As shown in FIG. 5, the toggle clamp device 101 includes a pressing portion 1 capable of pressing the upper die 102 on the lower die 103 side.
04 is provided. The pressing portion 104 includes a link 105
The upper die 102 and the lower die 103 are configured to be clamped or released by operating the lever 106.

When the toggle clamp device 101 is used and the upper mold 102 and the lower mold 103 are released from clamping, the toggle clamp device 101 is sequentially opened from one side. For this reason, there has been a problem that distortion occurs in the upper mold 102 due to the foaming pressure in the mold and burr defects occur in the foam.

Further, since the toggle clamp device 101 is sequentially opened, the toggle clamp device 1 which can be opened later is
There was a problem that a load was imposed on the 01 and it was easily damaged. Furthermore, when releasing the clamp, the upper mold is springed up by foaming pressure and collides with the presser located above the mold,
There was a problem that noise was generated.

Further, as described above, in the configuration using the toggle clamp device 101, the toggle clamp device 10
Since the mold tends to be distorted due to the foaming pressure in the mold when releasing 1, the gas pressure in the mold cannot be increased beyond a certain level. For this reason, the upper limit of the hardness of the cushion material is about 55 kgf / φ200, and it has been difficult to produce a cushion material having higher hardness.

In addition to the above-described toggle clamp device, a collective clamp device 110 as shown in FIGS. 6 and 7 is known. The collective clamping device 110 includes an arm portion 114 provided on an upper mold 112 and a locking portion 1 provided on a lower mold 113.
15.

In the above-described collective clamping device 110, the upper die 1 is fitted by fitting the arm portion 114 to the locking portion 115.
12 and the lower mold 113 are crimped. The arm 11
By removing 4 from locking portion 115, the crimping of upper mold 112 and lower mold 113 is released. The arm 114
Is connected to a bar 116, and a plurality of clamp devices can be simultaneously released by rotating the bar 116.

As described above, since the plurality of clamp devices are simultaneously released, it is possible to prevent the upper die 112 from being distorted when releasing the mold clamping. However, in the collective clamping device 110, since a plurality of clamping devices come off at a time, a mechanism for pressing the upper mold 112 is separately required,
There was a problem that a large remodeling of the line was required.

Further, as another clamping device, a clamping device 120 using an air bag 121 as shown in FIGS. 8 and 9 is known. Air bag 1
As shown in FIG. 9, 21 is located below the surface plate of the lower mold 123, and the lower mold 123 is moved upward by injecting air into the airbag 121, and is pressed against the upper mold 122. Is configured.

When releasing the clamp between the upper die 122 and the lower die 123, a gap can be provided between the upper die 122 and the lower die 123 by bleeding the air from the airbag 121.

[0013] In the case of a hydraulic clamping device (not shown), similarly, the lower portion of the lower mold platen expands and contracts from a V-shape state to a vertical state, and conversely, from a V-shape state to a C-shape state. A possible leg is provided, and the leg is extended and contracted by the operation of a hydraulic cylinder, and the platen is moved up and down to press the upper mold and the lower mold together or release the crimp.

However, when the clamp device 120 using the air bag 121 or the hydraulic clamp device is employed, there is a problem that it takes time to replace the mold.

In order to simultaneously move a plurality of airbags 121 and a plurality of legs to clamp a plurality of sets of dies at once, a general-purpose clamp frame for holding a plurality of upper dies is provided above the upper dies. There is a need to. Therefore, there is a problem that it is difficult to set an air vent for bleeding air from the upper surface of the upper mold.

The above-mentioned general-purpose clamp frame is expensive.
In addition, since the clamp device is a large-scale facility, there is a problem in that existing facilities cannot be used and costs increase.
Also, for the mold, a platen is provided below the lower mold,
It was necessary to provide a connecting mechanism at the contact portion so that the upper die and the lower die did not shift, and it was difficult to modify the current type.

An object of the present invention is to provide a clamp device which can discharge a foaming gas in a mold sufficiently with a simple structure.

[0018]

SUMMARY OF THE INVENTION According to a first aspect of the present invention, there is provided a clamping device provided with one of an upper mold and a lower mold and a fixing member provided on the other of the upper mold and the lower mold. Provided a movable member, wherein the upper die and the lower die are clamped to each other by the movable member being engaged with the fixed member, wherein the fixed member is
A first engagement portion where the upper mold and the lower mold are clamped when the movable member is engaged, and a gap is formed between the upper mold and the lower mold by the engagement of the movable member. Held second
And an engaging portion of the above.

In the clamp device of this embodiment, one of the upper mold and the lower mold is provided with a fixed member, the other is provided with a movable member, and the fixed member is provided with a first engaging portion and a second engaging portion. The upper die and the lower die are clamped by the movable member being located in the first engagement portion, and the upper die and the lower die are being closed by the movable member being located in the second engagement portion. Can be held with a gap therebetween. Therefore, the foaming gas in the mold can be sufficiently removed from the gap between the upper mold and the lower mold.

Further, according to the clamp device of the present embodiment, at least two of the fixed member and the movable member are provided on the upper mold and the lower mold, respectively, and the movable member is simultaneously engaged with the fixed member. And it is constituted so that it may be released, so that distortion of the upper mold or the lower mold due to the foaming pressure can be prevented. Furthermore, since force is not concentrated on one clamp device, it is possible to prevent the clamp device from being damaged.

As described above, according to the clamp device of this embodiment, the gas in the mold can be sufficiently discharged after the foaming is completed. In addition, since a plurality of clamp devices are simultaneously released, there is no distortion of the mold due to foaming pressure or damage to the clamp device at the time of releasing the clamp, so that sufficient foaming in the mold is possible. Become. Therefore, it is possible to obtain a foam having higher hardness than before.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A clamping device 10 of this embodiment comprises a fixing member 11 provided on an upper mold 21 of a mold 20 and a lower mold 22.
And the movable member 12 provided in the first position. When the upper mold 21 and the lower mold 22 are clamped, the movable member 12 is engaged with the first engaging portion 11 a of the fixed member 11.

The fixing member 11 is provided with a first engaging portion 11a and a second engaging portion 11b. Movable member 12
When the first engaging portion 11a is engaged with the upper mold 21, the upper mold 21 and the lower mold 22 are clamped. When the movable member 12 and the second engaging portion 11b are engaged, the upper mold 21 and the lower mold 22 are held with a gap therebetween.

It should be noted that the clamp device 10 of the present embodiment
The three movable members 12 are configured to be simultaneously engaged with and disengaged from the fixed member 11.

[0025]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIGS. 1 to 3 show one embodiment of the present invention. FIG. 1 is a perspective view showing a mold to which a clamp device of the present invention is attached, FIG. 2 is a perspective view showing a clamp device, FIG. 3 is a side view of the clamp device.

The clamp device 10 of this embodiment is used for a mold 20 for producing a synthetic resin foam molded article. The mold 20 includes an upper mold 21 and a lower mold 22, and a cavity having a predetermined shape is formed between the upper mold 21 and the lower mold 22.

The clamp device 10 of this embodiment comprises a fixed member 11 provided on an upper die 21 of a mold 20 and a movable member 12 provided on a lower die 22. The clamp device 10 of the present example is provided at three places of the mold 20.

As shown in FIG. 2, the fixed member 11 is provided so as to protrude from the upper die 21 and has a length and a width which can be engaged with the movable member 12 described below. The fixed member 11 of this example is provided with a first engaging portion 11a located on the upper mold 21 side and a concave second engaging portion 11b as engaging portions with the movable member 12. In this example, the second engaging portion 11b is formed at a depth of 5 mm. Further, adjacent to the second engaging portion 11b, the movable member 12
Are removed when the arm 11c slides with the movable member 11.
Are formed.

The fixing member 11 of this embodiment is provided on the pedestal 13 which can be attached to and detached from the upper die 21. The fixing member 11 is not limited to one die but can be used for another die.
The pedestal 13 is fixed to the upper die 21 by a pair of mounting screws 13b.
It is fixed to.

The pedestal 13 of this embodiment has an adjusting screw 13a and a slit 1 for adjusting the position of the pedestal 13.
3c is provided. The slit 13c is formed to be able to engage with the mounting screw 13b.

Therefore, by rotating the adjusting screw 13a with the mounting screw 13b loosened, the mounting screw 13b slides in the slit 13c, and the position of the pedestal 13 can be adjusted. As described above, since the position of the pedestal 13 is configured to be adjustable up and down,
With the fixing member 11 positioned at a predetermined height, the tightening force of the clamp device can be adjusted.

As shown in FIG. 2, the movable member 12 includes a shaft portion 12a engaged with the fixed member 11, and a holding portion 12b for holding the shaft portion 12a. Holder 1
2b is connected to the bar 14 provided on the lower mold 22 side as shown in FIG.

The bar 14 is provided with a lever 14a, and the bar 14 is configured to rotate by moving the lever 14a up and down. Therefore, the bar 1 is moved by moving the lever 14a up and down.
It is possible to move three movable members 12 connected to 4 at the same time.

As described above, since the plurality of movable members 12 are configured to be movable at the same time, the movable members 12 can be simultaneously removed from the fixed member 11. Therefore, since the gas in the mold is uniformly discharged from between the upper mold 21 and the lower mold 22, the foaming gas in the mold is discharged from one place as in the conventional toggle clamp device. It is possible to prevent the mold from being distorted, and prevent the upper mold from being distorted and the burr defect caused by the distortion.

Next, the operation of the clamp device 10 of this embodiment will be described. When the mold 20 is clamped, the movable member 12 is moved in a direction indicated by an arrow a in FIG. 2 and the shaft portion 12 a of the movable member 12 is moved to the first engagement portion 1 of the fixed member 11.
1a.

After the foaming is completed in the mold 20,
The movable member 12 is moved to the second engaging portion 11b. As a result, a gap is formed between the upper mold 21 and the lower mold 22, and the upper mold 21 and the lower mold 22 are held with the gap thus formed, and the foaming gas is discharged from the gap.

When the foaming gas is discharged, the mold is opened to take out the foam. At this time, since the round part 11c is formed at the end of the fixed member 11, by sliding the movable member 12 along the round part 11c,
The movable member 12 can be removed from the fixed member 11 smoothly.

In this embodiment, a toggle clamp device, etc.
In order to be able to use with other clamping devices,
1, the fixed member 11 is provided, and the movable member 12 is provided on the lower mold 22. However, the present invention is not limited to this, and the fixed member may be provided on the lower mold 22, and the movable member may be provided on the upper mold 21. Of course.

As described above, even when the lower die 22 is provided with the fixed member and the upper die 21 is provided with the movable member,
When the movable member 12 is detached from the fixed member 11, the movable member 12 engages with the second engagement portion 11b of the fixed member 11,
Since the upper mold 21 and the lower mold 22 are held in a half-open state, there is no need to separately provide a mechanism for holding the upper mold 21, and the present invention can be applied without a problem such as an increase in cost.

[0041]

As described above, in the clamp device of the present embodiment, the fixed member is provided on one of the upper mold and the lower mold, the movable member is provided on the other, and the first engaging portion and the first engaging portion are provided on the fixed member. 2
The upper and lower dies are clamped by the movable member being located at the first engaging portion, and the movable member is located at the second engaging portion, The upper mold and the lower mold can be held with a gap between them. Therefore, it is possible to remove the foam gas in the mold from the gap while holding the upper mold and the lower mold in a state where a gap is formed between them.

According to the clamp device of this embodiment, at least two of the fixed member and the movable member are provided on the upper mold and the lower mold, respectively, and the movable member simultaneously engages with the fixed member. The gas is uniformly released from between the upper mold and the lower mold, and the distortion of the upper mold or the lower mold due to the foaming pressure can be prevented. Furthermore, since force is not concentrated on one clamp device, it is possible to prevent the clamp device from being damaged.

Further, the clamp device of the present invention is configured so that the plurality of clamp devices are simultaneously released and, as described above, the upper die and the lower die are held with a gap therebetween. In addition, there is no need to separately provide a mechanism for holding the upper mold, and the invention can be applied to a line without increasing the cost.

As described above, according to the clamp device of this embodiment, the gas in the mold can be sufficiently discharged after the foaming is completed. In addition, since a plurality of clamp devices are simultaneously released, there is no distortion of the mold due to foaming pressure or damage to the clamp device at the time of releasing the clamp, so that sufficient foaming in the mold is possible. Become. Therefore, it is possible to obtain a foam having higher hardness than before.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a mold to which a clamp device of the present invention is attached.

FIG. 2 is a perspective view showing a clamp device.

FIG. 3 is a side view of the clamp device.

FIG. 4 is an explanatory diagram showing a conventional example.

FIG. 5 is an explanatory view showing a conventional example.

FIG. 6 is an explanatory diagram showing a conventional example.

FIG. 7 is an explanatory diagram showing a conventional example.

FIG. 8 is an explanatory diagram showing a conventional example.

FIG. 9 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 Reference Signs List 10 clamping device 11 fixing member 11a first engaging portion 11b second engaging portion 12 movable member 12a shaft portion 12b holding portion 13 pedestal 13a adjusting screw 13b mounting screw 13c slit 14 bar 14a lever 20 mold 21 upper Mold 21a Mounting part 22 Lower mold

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Eiji Tsuchida, Inventor 467-15 Kurisaka, Kurashiki City, Okayama Prefecture Inside Asahi Ei Form Co., Ltd. F term (reference) 4F202 AA42 AG20 AH26 CA01 CB01 CL02 CL42

Claims (2)

[Claims] A fixed member provided on one of an upper mold and a lower mold, and a movable member provided on the other of the upper mold and the lower mold, wherein the movable member is engaged with the fixed member. A clamp for clamping the upper mold and the lower mold to each other, wherein the fixed member has a first engagement in which the upper mold and the lower mold are clamped when the movable member is engaged. A clamping device comprising: a first portion; and a second engagement portion in which the upper and lower dies are held with a gap therebetween by engagement of the movable member. 2. The fixed member and the movable member are provided at least two in each of the upper die and the lower die, and the movable member is simultaneously engaged with and released from the fixed member. The clamping device according to claim 1.