JPH11268095A - Mold opening preventing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly conduct locking or unlocking with a simple and low-cost structure by providing a plurality of guide pins at one of movable and fixed molds, and providing a detachable bush formed with a guide hole at a bore part at a position opposed to the pins and a hollow part for operating a hydraulic oil at an outer peripheral part. SOLUTION: A plurality of guide pins 23 are provided at a mold contact surface of a fixed mold. A bush 25 having a guide hole 24 for inserting the pin 23 when both the molds are brought into contact with one another is provided at a position of a mold contact surface C of the movable mold 22 opposed to the pins 23. A flange 27 is clamped by a bolt 28 so that both the molds are brought into snug contact with one another, and embedded. A hollow part 30 is formed between a hole part 26 and a sidewall 29 for forming the hole 24 when the bush 25 is embedded in the part 26. Here, when a high pressure hydraulic oil is operated from a hydraulic source to the part 30 via a passage 31, it is bulged. The sidewall 29 is bulged to its inside to narrow the hole 24 so that the pins 23 are clamped to eliminate opening of the mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a plurality of
After injecting each mold in the molding machine, the mold is carried out of the molding machine, another mold is carried into the molding machine during heating and cooling, and the next injection is performed. The present invention relates to a mold used for foam molding, gas injection, and the like, and particularly relates to a mold opening preventing device that holds a mold carried out of a molding machine so as not to open.

[0002]

2. Description of the Related Art In a foam molding or gas injection, one molding cycle is long, and in order to improve the cycle, a plurality of dies are used to inject one mold in a molding machine, and then the same mold is used. It is well-known that the mold is carried out of the molding machine, another mold is carried into the molding machine while heating and cooling is performed, and the next injection is performed. At this time, the mold carried out of the molding machine is carried out. Since the mold is held so that the mold does not open due to the pressure of the resin material filled in the mold, and is carried in and out every cycle, it is necessary to smoothly perform locking and unlocking.

As shown in FIGS. 3 and 4, a conventional mold of this type is a mold 1 comprising a fixed mold 2 and a movable mold 3 on either the fixed mold 2 or the movable mold 3 side. (This explanation is a movable mold.) It is supported so as to be able to swing left and right around a fulcrum 4 provided at one end, and one end is engaged with a latching portion 5 formed of a groove or the like in the counterpart fixed mold 2. And a spring which is located between the fulcrum 4 of the hook 7 and the key portion 6 at one end, and which acts so as to always lock the key portion 6 on the hook portion 5. 8 and the other end 9 of the hook 7 while clamping the mold 1 to the mold mounting surfaces A and B.
To release the key-shaped part 6 at one end of the hook 7 from the hook part 5 against the attraction of the spring 8 so that the mold 1 can be opened, and the mold 1 is unlocked to the mold mounting surfaces A and B. At the time of clamping, the clamp piece 10 is simultaneously separated from the other end 9 of the hook by the unclamping operation, and acts so that the key-shaped portion 6 at one end of the hook 7 is engaged with the engaging portion 5 by the attraction of the spring 8. There is a mold opening preventing device having mold clamping devices 11 and 12 provided with a mold. When the mold is carried out of the molding machine, that is, when the mold 1 is unlocked on the mold mounting surfaces A and B. Whenever it is clamped, the mold opening prevention device operates to prevent the mold from opening.

[0004]

However, the above-described device is locked for loading and unloading the mold every cycle.
Although the unlocking is performed smoothly, it is necessary to perform various operations on the mold by using a special mold clamping device, which not only increases the machining cost but also complicates the structure.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive mold opening preventing apparatus which solves the above-mentioned drawbacks, can smoothly lock and unlock a mold every cycle, has a simple structure, and is inexpensive. is there.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a mold comprising a movable and a fixed mold, wherein a plurality of molds are provided on a mold contact surface on one of the movable and fixed molds. The guide pin of the inner diameter portion is fitted with the guide pin at a position facing the guide pin on the mold contact surface on the other side, and the outer diameter portion forms a hollow portion for applying high-pressure hydraulic oil. A mold opening prevention device comprising a bush made detachable from the guide pin having a side wall having a shape.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 20 denotes a mold composed of a fixed mold 21 and a movable mold 22. A plurality of guide pins 23 are provided on the surface C. The two dies 21 and 22 are located on the mold contact surface C of the movable mold 22 at positions facing the plurality of guide pins 23.
A bush 25 having a guide hole 24 into which the guide pin 23 is inserted when the bush 25 abuts is provided.

As shown in FIG. 2, the bush 25 is so shaped as to allow the two dies 21 and 22 to come into contact with the hole 26 formed in the mold contact surface C of the movable mold 22 when the two dies 21 abut. Fix the flange 27 with the bolt 2 so as not to protrude from the mold contact surface C.
8 fixed and embedded. 29 is a guide hole 24
When the bush 25 is embedded in the hole portion 26, a hollow portion 30 is formed between the hole portion 26 and the side wall 29, and the hollow portion 30 is not shown. High-pressure hydraulic oil acts as shown by an arrow a from the hydraulic pressure source through the passage 31. Reference numeral 32 denotes a sealing member for oil such as an O-ring.

Since the resin material is injected into the mold by the above-described foam molding and the like, and is carried out of the molding machine, the high-pressure hydraulic oil is introduced into the hollow portion 30 from the passage 31. The hollow portion 30 expands, the side wall 29 expands inward, the guide hole 24 is narrowed, the guide pin 23 is tightly fitted, and the mold 20 cannot be opened.

[0010]

As described above, the present invention has a simple structure in which a conventional standard mold is provided with a hole and a bush is buried therein. Compared to the increase in processing cost, locking and unlocking can be performed smoothly every cycle simply by applying high-pressure hydraulic oil to the hollow part, the structure is simple, the processing cost is low and the processing cost is low. is there.

[Brief description of the drawings]

FIG. 1 is a perspective view of a mold showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a bush showing one embodiment of the present invention;
FIG. 2 is a detailed view of a DD section of FIG. 1.

FIG. 3 is an explanatory view of a conventional mold opening preventing device, showing a state in which a mold can be opened.

FIG. 4 is an explanatory view of a conventional mold opening preventing device, showing a state in which the mold cannot be opened.

DESCRIPTION OF SYMBOLS 20 Mold 21 Fixed mold 22 Movable mold 23 Guide pin 24 Guide hole 25 Bush 26 Hole 27 Flange 28 Bolt 29 Side wall 30 Hollow part 31 Passage 32 Seal member

Claims (1)

[Claims] 1. A plurality of guide bins provided on a mold contact surface on one of the movable and fixed dies of a mold comprising a movable and a fixed mold, and a mold contact surface on the other side. A guide bin is fitted in the guide hole of the inner diameter portion at a position facing the guide pin, and the outer diameter portion is made detachable with respect to the guide bin having a side wall having a hollow portion for applying high-pressure hydraulic oil. A mold opening prevention device having a bush.