JPH07214563A - Cooler for molds of molding machine - Google Patents

Abstract

PURPOSE:To improve productivity by incorporating a lower mold in a liquid tank having a volume for containing molds of lower and upper molds vertically separable, fixing the lower mold to a base, locking the upper mold to a vertically movable plate, and providing a cooling liquid supply/discharge unit for supplying/discharging cooling liquid to/from the tank. CONSTITUTION:An operating rod 12 of a cylinder is extended, an upper mold 8 is moved down via a movable plate 10, and brought into pressure contact with a lower mold 7. Molten material 22 is cast in a cavity 9 via a pouring tube 21 in this state. When a specified amount is cast, a pressure sensor 23 is operated to stop casing of the material 22. Then, a drain valve 19 is closed, a water suction valve 18 is opened, cooling liquid 24 is supplied into a liquid tank 4, and excess liquid 24 is drain from an overflow tube 20. Thus, an entire outer periphery of the molds 6 is strongly cooled, the material 22 in the cavity 9 is quickly cooled, and cured. After a predetermined time, the vale 18 is closed, and the valve 19 is opened, the rod 12 of the cylinder is shortened, the mold 8 is raised via the plate 10, separated from the mold 7, and a molded form is taken out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding machine for injecting a molten plastic material into a mold to mold it into a predetermined shape, and more particularly to a cooling device for cooling the mold.

[0002]

2. Description of the Related Art As a conventional technique, there has been one in which a water channel is formed inside a peripheral wall of a mold and cooling water is circulated in this water channel.

[0003]

The above-mentioned conventional ones have a drawback that a special processing technique is required for forming a water channel and the cost becomes high. Further, the water channel formed in the mold is limited in its forming location, cross-sectional area, etc. by the strength retention of the mold or the shape of the molded product, and has a limited cooling capacity. When molding a product, there is a drawback that the hardening time of the hot water in the mold becomes long and the productivity decreases. It is an object of the present invention to obtain a novel mold cooling device for a molding machine that solves the above-mentioned drawbacks.

[0004]

The present invention is configured as follows in order to achieve the above object. That is, a base is provided with a liquid tank having an open upper surface, and the liquid tank has a capacity to accommodate a mold consisting of a lower mold and an upper mold that can be divided into upper and lower parts, and the lower mold is housed in the liquid tank. The structure is such that it is fixed to the base, the upper die is locked to a movable plate that can move up and down, and a cooling liquid supply / discharge device for supplying and discharging the cooling liquid to / from the liquid tank is provided.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a sectional view of a main part in a molded state, and FIG.
Is a cross-sectional view of a main part in a released state, and FIG. 3 is a cross-sectional view taken along the line III-III of FIG. In FIG. 1, reference numeral 1 denotes a support, and a base 3 having a rectangular shape in a plan view is fixed to the support 1 via a column 2, and a rectangular parallelepiped liquid tank 4 is placed on the upper surface of the base 3. As shown in FIG. 2 and FIG. 3, this liquid tank 4 has a volume whose open upper surface and accommodates a mold 6 described later.

The mold 6 is composed of a lower mold 7 and an upper mold 8 that can be divided into upper and lower parts, and a cavity 9 is formed on the dividing surfaces of both. The lower die 7 is arranged at the bottom of the liquid tank 4, and is slightly floated from the bottom of the liquid tank 4 by the legs 5 to be fixed.
Is fixed to the lower surface of the movable plate 10 which is vertically moved by the cylinder. The movable plate 10 is formed in a rectangular shape in plan view so as to face the upper side of the base 3, and the four corners of the movable plate 10 are slidably fitted to four guide rods 11 that are vertically fixed from the four corners of the base 3. And the central portion of the upper surface is connected to the operating rod 12 of the cylinder (not shown). Then, the upper mold 8 is moved up and down through the movable plate 10 by expanding and contracting the cylinder.

A cooling liquid supply / discharge device 13 for supplying and discharging a cooling liquid (water in this example) 24 is provided in the liquid tank 4. That is, the flow pipe 14 is connected to the bottom side surface of the liquid tank 4, and the water supply pipe 1 is connected to the tip of the flow pipe 14 through a T-shaped pipe joint 15.
6 and the drain pipe 17 are connected in parallel, and a water feed valve 18 and a drain valve 19 are attached to the water feed pipe 16 and the drain pipe 17, respectively. Further, an overflow pipe 20 is connected to the upper side surface of the liquid tank 4.

Reference numeral 21 is a pouring pipe connected to the center of the bottom of the lower mold 7, and pours the hot and molten hot water 22 into the cavity 9. This hot water 22 heats and melts a thermoplastic plastic material, especially a thermoplastic plastic material recovered as waste, and is fed under pressure by a screw extruder. Reference numeral 23 denotes a pressure sensor attached to a side portion of the cavity 9 (downstream end of the hot water 22), which operates when a predetermined amount of the hot water 22 is injected into the cavity 9 to inject the hot water 22 into the cavity 9. It is supposed to stop.

Next, the operation mode of the above embodiment will be described. When the actuating rod 12 of the cylinder is extended, the upper die 8 descends via the movable plate 10 and comes into pressure contact with the lower die 7. In this state, the molten plastic material, that is, the hot water 22 is poured into the cavity 9 through the pouring pipe 21. When a prescribed amount of the hot water 22 is injected into the cavity 9, the pressure sensor 23 operates and the injection of the hot water 22 is stopped.

Then, the drain valve 19 is closed and the water supply valve 18 is opened. Then, while the cooling liquid 24 is supplied from the water supply pipe 16 into the liquid tank 4 through the flow pipe 14, the excess cooling liquid 24 is discharged from the overflow pipe 20 to the outside of the liquid tank 4 (see FIG. 1). Status). As a result, the entire outer periphery of the mold 6 is strongly cooled by the cooling liquid 24, and the hot water 22 in the cavity 9 is rapidly cooled and hardened (solidified).
For example, when a rectangular parallelepiped product (fume tube mounting base) having a weight of 30 kg is formed, it takes about 90 minutes to solidify in the past, whereas in this example, solidification takes about 30 minutes. It was

After the hot water 22 in the cavity 9 has hardened, the water supply valve 18 is closed and the drain valve 1 is closed.
Open 9 Then, the cooling liquid 24 in the liquid tank 4 is discharged to the outside from the drain pipe 17 via the flow pipe 14. Then, when the actuating rod 12 of the cylinder is shortened, as shown in FIG. 2, the upper die 8 rises through the movable plate 10 and separates from the lower die 7, whereby the fume tube mount, the separation zone block, The molded product 25 such as artificial wood is taken out.
In this case, in this example, when the upper mold 8 is lifted, the molded product 25 is attached to the upper mold 8 to be lifted, so that the mold releasing work is facilitated.

It should be noted that the water supply valve 18 and the drain valve 19 are replaced with electromagnetic valves, and a sensor for detecting the lowering and ascending of the upper die 8 is provided, and a signal from this sensor is input to control the opening and closing of the electromagnetic valve. You may

[0013]

As is apparent from the above description, according to the present invention, the liquid tank for housing the mold is provided, and the cooling liquid is supplied into the liquid tank to cool the mold. The hot water filled in the cavity of the mold can be quickly cooled and hardened, and the productivity is increased. Further, since it is not necessary to form a water channel in the mold as in the conventional case, the cost of the mold can be reduced, and the strength can be prevented from being lowered.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts in a molded state showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an essential part of a mold-released state showing an embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

 1 Support 2 Support 3 Base 4 Liquid Tank 5 Legs 6 Mold 7 Lower Die 8 Upper Die 9 Cavity 10 Movable Plate 11 Guide Rod 12 Actuating Rod 13 Cooling Liquid Supply Device 14 Distribution Pipe 15 Pipe Joint 16 Water Supply Pipe 17 Drainage Pipe 18 Water supply valve 19 Drain valve 20 Overflow pipe 21 Pouring pipe 22 Hot water 23 Pressure sensor 24 Coolant 25 Molded product

Claims (1)

[Claims] 1. A base is provided with a liquid tank having an open upper surface,
The liquid tank has a capacity to accommodate a mold consisting of a lower mold and an upper mold that can be divided into upper and lower parts. The lower mold is accommodated in the liquid tank and fixed to a base, and the upper mold is movable up and down. A cooling device for a mold for a molding machine, comprising a cooling liquid supply / drainage device which is locked to a plate and supplies and discharges a cooling liquid to / from a liquid tank.