JPH05261513A - Low pressure casting device - Google Patents

Abstract

PURPOSE:To safely and easily execute auxiliary works to a lower die such as cleaning around a sprue, setting of a core by carrying out the lower die together with a lower die base to the outside of a machine having no upper die with a horizontal shifting mechanism. CONSTITUTION:A low pressure casting work is completed and the die for which the casting product W is stuck to the upper die 18 is opened and by executing a pushing work with cylinders, a first roller conveyor 6 except inside is lifted to the level of a second roller conveyor 20 except inside to release the pressing- contact between a stoke tube 2 and the lower die 7. In such a condition, by working a sideward cylinder 10, the lower die 7 is horizontally shifted on the second roller conveyor 20 except inside together with the lower die base 8 and the appurtenant works to the lower die, such as the cleaning around the sprue, the setting work of the core, are executed. During this time, a product receiver is inserted into the lower part of the casting product W, and by shrink- working a cylinder 13 and working ejecting pin mechanism 19, the casting product W is dropped from the upper die 18 and received by the product receiver and carried out to the outside of the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention applies so-called gas pressure to a molten aluminum alloy stored in a holding furnace to raise it through a Stoke tube and pressurize it into the upper and lower mold cavities. Low-pressure casting equipment.

[0002]

2. Description of the Related Art Generally, a low-pressure casting apparatus has a die structure which is basically composed of upper and lower halves, and a lower die is fixed and an upper die is moved up and down. Auxiliary work of low-pressure casting includes core setting, mold cleaning around the sprue, etc.These auxiliary work is performed on the lower mold with the upper mold raised after taking out the cast product, but the operator In order to perform these tasks, one has to lean out between the upper and lower molds, and the danger of putting one's body under the upper mold that can be raised and lowered and the bad working environment due to the radiant heat emitted from the upper and lower molds poses problems. Was there. The present invention has been made in view of the above problems, and an object of the present invention is to provide a low-pressure casting device capable of safely and easily performing core setting work, auxiliary work for the lower mold such as cleaning around the sprue. It is a thing.

[0003]

In order to achieve the above object, a low pressure casting apparatus according to the present invention comprises a holding furnace for low pressure casting having a stalk pipe projecting upward at a position slightly above and a lower mold at the upper part. A horizontal transfer mechanism with a clamp means is provided which is capable of raising and lowering the attached lower die base so that the lower die base can be carried in and out and the lower die base can be lifted at a position directly above the holding furnace, and the holding furnace above the horizontal transfer mechanism is provided. An upper mold unit having an upper mold which can be matched with the lower mold at a position corresponding to is arranged so as to be able to move up and down.

[0004]

According to the present invention, by adopting the above-mentioned solution means, the upper die and the lower die are opened after casting, the casting is taken out, and the next casting is carried out. As a result, it becomes possible to carry out to the outside of the machine without the upper mold, clean around the sprue, and perform ancillary work for the lower mold such as the core set safely and easily.

[0005]

Embodiments of the present invention will now be described in detail with reference to the drawings. A holding furnace 3 for low-pressure casting having a stalk pipe 2 projecting above the base 1 is installed, and cylinders 4 are provided on both sides of the holding furnace 3 on the base 1 in the front and rear. 4 is erected and the cylinder 4,
The piston rods 5 and 5 at 4 are connected to the lower ends of the first hollowing roller conveyors 6 and 6 which are arranged above the stalk pipe 2 in the left-right direction. That is, the first hollowing roller conveyors 6, 6 are configured to move up and down by the operation of the cylinders 4, 4. A lower die base 8 having a lower die 7 mounted thereon is placed on the first hollowing roller conveyors 6, 6, and the lower die base 8 is the first hollowing roller conveyors 6, 6 in FIG. A horizontal cylinder 1 mounted inwardly on the right end of the cylinder via a bracket 9.
Pinned to 0. The first hollowing roller conveyors 6, 6 form flanges 6A, 6A projecting inward at their upper ends.

Supports 11, 11 are provided at the four corners of the upper portion of the base 1.
Is provided upright, a ceiling frame 12 is fixed between the upper ends of the columns 11 and 11, and the ceiling frame 1
A cylinder 13 is provided downward at the center of 2. An upper die plate 15 is fixed to the tip of a piston rod 14 of the cylinder 13, and a guide tube 16, 16 attached to the ceiling frame 12 is vertically slidably fitted to the rear surface of the upper die plate 15. The guide rods 17, 17 are attached. The upper die plate 1
An upper die 18 which can be fitted to the lower die 7 is attached to the lower part of the die 5, and an extrusion pin for pushing a cast product W out of the upper die 18 between the upper die plate 15 and the upper die 18. A mechanism 19 is provided and constitutes an upper mold unit as a whole. Further, on the extension line on the left side in the raised state of the first hollowing roller conveyors 6, 6, the second blanking roller conveyor 20 is supported by the columns 11, 11 and the supporting legs 11A, 11A standing upright outside the machine. It is fixedly arranged. Further, stoppers 3A, 3A for restricting the lowering of the lower die base 8 and clamping the lower die base 8 with the flanges 6A, 6A of the first hollowing roller conveyors 6, 6 are provided on the upper part of the holding furnace 3. ing. In the figure, R is molten aluminum.

In the case of such a configuration, as shown in FIG.
In the state of FIG. 2, the low-pressure casting operation is completed, the cast product W is attached to the upper die 18, the die is opened, and the cylinders 4 and 4 are extruded to move the first hollow roller conveyors 6 and 6 to the first die. (2) The hollowing roller conveyor 20 is raised to the level of the stalk tube 2 and the lower mold 7 to release the pressure. In this state, the horizontal cylinder 10 operates to move the lower die 7 to the lower die base 8
At the same time, it is moved from the first hollowing roller conveyor 6 to the second hollowing roller conveyor 20 and stopped at the position indicated by the chain line in FIG. 1, so that cleaning around the sprue and core work such as core setting work can be performed. Done. In the meantime, a product receiver (not shown) is inserted in the lower part of the cast product W and the cylinder 1
3 contracts to operate the push-out pin mechanism 19 to drop the cast product W from the upper die, receive it in the product receiver, and carry it out of the machine.

Next, the horizontal cylinder 10 is reversely operated to move the lower die 7 with the core set therein together with the lower die base 8 from the second hollow roller conveyors 20, 20 to the first hollow roller conveyor 6,
After the movement of the cylinders 4 and 6 is stopped, the cylinders 4 and 4 are contracted to lower the first hollow conveyors 6 and 6. During this descent, during the descent, the stopper 3 above the holding furnace 3
The lower die base 8 comes into contact with A and 3A, the lowering thereof is stopped, the upper end of the stalk pipe 2 comes into contact with the sprue part of the lower die 7, and the cylinders 4 and 4 contract to perform the first middle operation. By lowering the removal conveyors 6 and 6, the lower die base 8 is lifted from the rollers and the upper surfaces are brought into contact with the flanges 6A and 6A, and the lower die base 8 is clamped by the stoppers 3A and 3A and the flanges 6A and 6A. The stalk tube 2 and the lower die 7 are brought into a state of being pressed against each other and stopped.
Next, the cylinder 13 is extended to lower the upper die 18 together with the upper die base 15, and the upper die 18 is fitted to the lower die 7 to obtain the state shown in FIG.

In this state, compressed air is supplied into the holding furnace 3 to inject the molten metal R into the cavity portion through the stalk pipe 2, hold the pressurized state for a predetermined time, and when the molten metal R solidifies, the holding furnace 3 The supply of compressed air to the holding furnace 3 is stopped, and the compressed air in the holding furnace 3 is exhausted. As a result, the molten metal R in the stalk pipe 2
Are returned to the holding furnace 3. Next, the cylinder 13 is actuated to raise the upper die 18 together with the upper die base 15 to the state shown in FIGS. Conveyor 6, 6
Is lifted to release the clamped state of the lower die base 8 (holding between the stopper 3A and the flange 6A), and the pressure contact between the stalk pipe 2 and the lower die 7 is also released, resulting in the states shown in FIGS. Repeat. The second hollow roller conveyor 20 in the above embodiment may be omitted, and the first hollow roller conveyor 6 may be extended to move up and down as a whole.

In the above-mentioned embodiment, one example of the transfer mechanism with the clamp means for the lower die base 8 is disclosed, but as shown in FIG. 4 or 5, the mechanism may be different from that of the above-mentioned embodiment. .. That is, in FIG. 4, the rollers 6R of the first punching roller conveyor 6 are provided in upper and lower two stages, and the lower die base 8 is always clamped and conveyed between the upper and lower two stages of rollers 6R and 6R. Alternatively, the clamp may also be used as a dual purpose. In this case, the stoppers 3A, 3A may be eliminated to regulate the contraction stroke of the cylinders 4, 4 so as to control the pressure contact between the stalk tube 2 and the lower die 7. Further, in FIG. 5, flanges 6B and 6B projecting from the lower end of the first hollowing roller conveyor 6 in the above embodiment are also provided.
Rails 6C and 6C are laid on the portion 6B, and wheels 8A and 8 are rotatably moved on the lower die base 8 on the rails 6C and 6C.
A may be provided and moved.

[0011]

As is apparent from the above description, the present invention is carried out by carrying the lower die together with the lower die base into and out of the machine to perform casting work, cleaning around the sprue, and auxiliary work for the lower die such as the core set. Since both of them are performed, the original low pressure casting work can be surely performed, and the auxiliary work for the lower die can be safely and easily performed, which is a great advantage.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing an embodiment of the present invention.

FIG. 3 is a partially cutaway side view showing a state immediately before a casting operation in the example.

FIG. 4 is a second transfer mechanism with a clamping means for the lower die base.
It is a side view which shows an Example.

FIG. 5: Third transfer mechanism with clamping means of lower die base
It is a side view which shows an Example.

[Explanation of symbols]

 2 Stoke tube 3 Holding furnace 4 13 Cylinder 6 1st hollow roller conveyor 6A 6A Flange 6C Rail 6R Roller 7 Lower die 8 Lower die base 8A Wheel 18 Upper die R Aluminum molten metal W Cast product

Claims (1)

[Claims] 1. A lower die base having a lower mold attached to the upper part thereof can be carried in and out at a position slightly above the holding furnace for low pressure casting in which a stalk pipe is projected upward, and the lower die base is directly above the holding furnace. An upper mold having a horizontal transfer mechanism with a clamp means that can be lifted and restricted at a position so as to be able to move up and down, and an upper mold that can be matched with the lower mold at a position corresponding to the holding furnace above the horizontal transfer mechanism. A low-pressure casting apparatus having a unit that can be moved up and down.