JPS6076265A - Discharging and feeding device for die - Google Patents

Abstract

PURPOSE:To discharge effectively the air in a cavity and to achieve adequately a feeding effect by disposing a cylinder in a passage led from the cavity, connecting the cylinder to an actuator and forming a discharge hole to the cylinder. CONSTITUTION:A movable die 12 and a stationary die 10 are engaged with each other and a molten metal 50 is fed into a hole part 14. A piston rod 18 is moved forward to force the molten metal 50 to flow through a well 20, a cavity 22, a passage 24 and the hole part and to arrive at the inside of a cylinder 28. The air let from the cavity 22 is escaped through a discharge pipe 30. When the piston 38 in an actuator 36 is moved forward, the side wall of a piston 32 closes the hole of the pipe 30. The molten metal 50 is gradually lowered by the feeding effect of the piston 32 when the molten metal 50 in the cavity 22 decreases its volume on solidifying. The density of the molten metal 50 in the cavity 22 is thus increased. As a result, the generation of misrun, blowholes, cavity, etc. is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold exhaust and feeder device, and more particularly, the present invention relates to a mold exhaust and feeder device, and more particularly, a cylinder is provided in a mold attached to a die casting machine or the like, and a cylinder is defined inside the mold. The present invention relates to a mold exhaust and feeder device configured to forcibly exhaust air in a cavity and also perform a feeder action.

For example, in die casting machines and the like, it is necessary to properly evacuate air from the cavity of a mold attached to the machine in order to obtain a void-free injection product. For this reason, the mold itself has traditionally defined shallow grooves or passages, especially for air escape. That is, molten hot water is introduced into the cavity, and air is led out from the shallow groove or escape passage using the inertia force generated thereby.

However, in the above-mentioned configuration, the cost of the mold increases due to the special provision of shallow grooves or air escape passages in the mold, which increases the manufacturing cost of the molded product. .

Further, when a shallow groove is used to extract air, if the groove is too deep, a large amount of cracks will occur, which may impede trimming and sometimes lead to product defects.

Furthermore, if the groove is particularly shallow, air cannot be sufficiently discharged, and the /8 metal is not sufficiently distributed within the cavity, resulting in not only poor molten metal flow but also the formation of blowholes.

On the other hand, during the solidification of the casting, feeding is performed to compensate for the decrease in the volume of the molten metal, but the molten metal used to mold the product has a relatively large volume. Therefore, the sprue may solidify first, or a part of the cavity may solidify, leading to a situation where the essential boiling action is not performed (or it may cause shrinkage cavities). These are
In the end, it has been pointed out that this is an inconvenient cause of product defects.

Therefore, as a result of repeated research and trial production, the inventor of the present invention incorporated a cylinder into the upper part of the mold, energized the cylinder, and used the movement of the piston of the cylinder and the inertia of the molten metal to move the air inside the cavity to the outside. It has been found that many of the above-mentioned problems can be eliminated if the molten metal in the cavity is discharged and the piston continues to move to push back the molten metal in the cavity to perform a feeder action.

Therefore, it is an object of the present invention to effectively exhaust the air in the mold cavity during casting molding with a small and simple structure, and in particular to achieve the feeder action without providing a top riser or side riser for the feeder. The object of the present invention is to provide a mold exhaust and riser device that is suitably achieved.

In order to achieve the above object, the present invention provides a cylinder that communicates with a passage led out from a cavity defined by a fixed mold and a movable mold, and a piston in the cylinder. The cylinder is connected to an actuator by a rod, and an exhaust hole is formed in a part of the cylinder, and the piston is moved within the cylinder under the force of the actuator to exhaust the air in the cavity and operate the feeder. It is characterized by configuring.

Next, preferred embodiments of the mold exhaust and feeder device according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, reference numeral 10 indicates a fixed mold, that is, a fixed die, which is fixed to a fixed guide plate (not shown) in the die-casting machine, and reference numeral 12 indicates 1. A movable mold, ie, a movable die, is shown attached to the movable goo plate. A cylindrical hole 14 extending horizontally is defined in the lower part of the fixed die 10, and a piston 16 is slidably fitted into the hole 14. That is, the piston 16 is fixed to the tip of a piston rod 18, and the piston rod 18 is further connected to an actuator (not shown).

Next, a pool 20 is formed between the fixed die 10 and the movable die 12 and in communication with the hole 14, and a cavity 22 of a predetermined shape is defined in the upper part of the pool 20 in communication with this. . A /8 hot water passage 24 further extends upward from the cavity 22 and terminates in a cylindrical hole 26.

Therefore, a cylinder 28 is disposed in the upper part of the die 10.12 constructed as described above, corresponding to the hole 26. An exhaust pipe 30 extending horizontally is disposed approximately at the center of the cylinder 28 extending vertically, and a piston 32 is fitted into the cylinder 28 so as to be able to reciprocate.

The piston 32 is secured to one end of a piston rod 34, and the other end of the piston rod 34 is secured to a piston 38 within an actuator 36. Conduit pipes 40 and 42 for introducing and discharging the driving fluid of the actuator 36 are connected to the end sides of the actuator 36, respectively. Said conduit 40.42 connects to a 4-port 4-way valve 44 capable of indicating three positions.

In addition, in the figure, reference numeral 46 is a pump device for supplying the required fluid, that is, oil, to the actuator 36 via the valve 44, and reference numeral 48 is a tank for oil return. .

Therefore, the functions and effects of the mold exhaust and feeder device configured as described above will be described below.

First, a mold clamping cylinder (not shown) of the die-casting machine is energized to securely engage the movable die 12 with the fixed die 10. Then, fg hot water 50 is fed into the hole 14 via a hot water supply device (not shown).

in this case,? '8? After supplying the required amount of JA 50 into the hole 14, when the actuator is energized to move the piston rod 18 forward, the piston 16 at the tip thereof
The /8 hot water 50 is placed in a hot water pool 20, a cavity 22, and a passage 2.
4. Let it reach the inside of the cylinder 28 through the hole 26. During this time, since the valve device 44 is energized to move the piston 38 of the actuator 36 forward, the piston 32 in the cylinder 28 has reached the first position as shown in FIG. Therefore, when the molten metal 50 enters the upper part of the cylinder 28 as described above, the air drawn out from the cavity 22 etc. in the cylinder 28 escapes to the outside via the exhaust pipe 30.

Valve device 44 is then reenergized to actuate actuator 36.
The inner piston 38 is further moved forward. As a result, the side wall of the piston 32 closes the hole of the exhaust pipe 3o, and the bottom surface of the piston 32 closes the molten metal 50 in the cylinder 28.
comes into contact with the top surface of

That is, the piston 32 reaches the second position and the molten metal 5
A shutoff state of 0 will be obtained.

When a predetermined period of time elapses in this state, cavity 2
The molten metal 50 in the molten metal 2 gradually solidifies by cooling and reduces its volume. Valve device 44 is then energized again and piston 32 occupies the third position as shown in FIG.

In this case, during the movement of the piston 32, the molten metal 50
A feeder action is applied to gradually lower the molten metal 50, and as a result, the density of the molten metal 50 within the cavity 22 is significantly increased. That is, within the cavity 22, the molten metal 50 is evenly distributed to every detail, and as a result, it is possible to prevent the occurrence of poor molten metal circulation, cavities, and shrinkage cavities.

When taking out the molded product, after the feeder operation is completed and a predetermined period of time has elapsed, the valve device 44 is energized, the piston 32 is raised to reach the first position, and the movable die 12 is moved. Bye.

According to the present invention, as described above, a valve device and a cylinder are attached to the die, and the piston in the cylinder is changed to three positions to discharge air in the mold and adjust the feeder in stages. It was designed to be carried out by two mechanisms. Therefore, there is no need to provide a special shallow groove in the mold, which promotes a reduction in the manufacturing cost of the product, and also improves the quality of the molded product because the feeder operates well. Various effects can be obtained.

The present invention has been described above with reference to preferred embodiments, but
It goes without saying that the present invention is not limited to this embodiment, and that various design changes and improvements can be made without departing from the gist of the invention.

[Brief explanation of the drawing]

The figures relate to the present invention; FIG. 1 is an explanatory diagram showing the position of the piston in the first position when filling the die with molten metal, and FIG. , a partially omitted explanatory diagram showing a state in which the exhaust hole is closed and the cavity is filled with molten metal.
It is a partially omitted explanatory diagram of a state in which the robot has moved to a certain position and is performing a feeder operation. 10... Fixed die 12... Movable die 14... Hole 167. Piston 1st... Piston rod 2o... Water reservoir 22゛ Cavity 24... Passage 26... Hole 28... Cylinder 30... Exhaust pipe 32... Piston 34... Piston rod 36... Actuator 3rd... Piston 40.42・・Conduit 44・・Valve 46・
・Pump device 48...tank 50...molten water

Claims (1)

[Claims] (11) A cylinder is disposed in communication with a passage led out from a cavity defined by a fixed mold and a movable mold, and a piston in this cylinder is connected to an actuator by a piston rod. In addition, an exhaust hole is formed in a part of the cylinder, and the piston is moved within the cylinder under the force of an actuator to exhaust the air in the cavity and operate the feeder. (2. In the device according to claim 1, the actuator is connected to a 4-port 4-way valve, and the piston is controlled to stop at 3 positions in the cylinder. Mold exhaust and riser equipment consisting of: