JP3712194B2 - Upper mold operation method of mold casting with horizontal mold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an upper mold operating method for mold casting in which molten metal in a holding furnace is poured into a cavity of a horizontally split upper and lower mold that is clamped to obtain a cast product.
[0002]
[Prior art]
Conventionally, a die casting apparatus using a holding furnace has been widely used (see, for example, JP-A-63-273561). FIG. 3 shows a mold casting apparatus using a horizontal split mold described in this publication. In the mold casting apparatus 101, an outer frame is constituted by four frame columns 102. Each frame column 102 is erected on a base 103, and a holding furnace 105 is placed on the base 103. The carriage 104 is configured to travel.
[0003]
However, the mold casting apparatus 101 described in this publication has the following problems. First, a cylinder 107 that supports the upper mold 106 from above is provided at the top of the frame column 102. For this reason, the height of the entire mold casting apparatus is high, and the entire mold casting apparatus cannot be carried as it is by a normal transport truck. Therefore, when the mold casting apparatus is transported, the frame casting apparatus 102 is transported by dividing the frame column 102 into upper and lower parts or three parts. When assembling such a mold casting apparatus, it is necessary to adjust the dimensions again, which is laborious.
[0004]
Next, since the cylinder 107 for supporting the upper mold 106 from above is provided at the uppermost part of the frame column 102, the number of parts is large, and as a result, the apparatus is expensive and complicated. Further, for products that require a mold release force, a mechanism such as an upward arrangement of the rod for the mold release is required, and the height of the apparatus is high.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and provides an upper die operating method for die casting by a horizontal die that can be easily transported and assembled and made into a compact device. For the purpose.
[0006]
[Means of order to that to solve the problems]
In order to achieve the above object, the upper mold operating method of the mold casting by the horizontal split mold according to the present invention is to pour molten metal in the holding furnace into the cavity of the clamped horizontal split upper and lower molds. A method for operating an upper die of a die casting to obtain a cast product, wherein the upper die that has been opened is lowered integrally with the piston rod of the upper die lifting cylinder by a contraction operation of a plurality of upper die lifting cylinders. The upper mold is lifted by a process of clamping the mold, pouring and cooling molten metal into the cavities of the clamped upper and lower molds, and extending the plurality of upper mold lifting cylinders. possess a step of opening the mold by separating from the lower mold is raised as the piston rod integrally mold elevating cylinder, outputs of the plurality of upper mold elevating cylinder in the mold opening process is, the mold clamping It is made larger than that in the step Turkey The features.
[0008]
Here, in the present invention, die casting is a general term for casting in which molten metal is poured into a die with pressure using a holding furnace, such as low pressure casting, suction casting, and differential pressure casting.
[0009]
Further, in the apparatus for carrying out the present invention, when a cylinder is provided below the holding furnace and the holding furnace can be raised and lowered, the holding furnace is pressure-bonded to a mold by raising and lowering with a jack arranged in the lower frame. Compared to the structure, there is an advantage that the die casting apparatus becomes more compact.
[0010]
Moreover, it does not ask | require whether the cylinder in the apparatus which implements this invention is a hydraulic cylinder, a pneumatic cylinder, and an electric cylinder. However, the use of an electric cylinder has the advantage of simplifying the structure. This is because in the case of a hydraulic cylinder, piping and a hydraulic pump are indispensable.
[0011]
On the other hand, when a hydraulic cylinder is used as the upper mold lifting cylinder, more preferably, the upper mold lifting cylinder includes an inner cylinder guide that assists the sliding movement of the piston rod. Accordingly, the upper die lifting cylinder also serves as a guide for lifting the upper die, and the upper die base can be raised and lowered horizontally and smoothly. Moreover, the casting manufactured by the method of this invention does not ask | require the material, such as aluminum and magnesium.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2 by taking a low-pressure casting apparatus as an example. FIG. 1 is a partially sectional schematic front view showing a mold opening state of a low pressure casting apparatus for carrying out the present invention. FIG. 2 is a schematic front view showing the mold clamping state.
[0013]
1 and 2, the mold 1 includes an upper mold 1a and a lower mold 1b. The upper mold 1a and the lower mold 1b are respectively an upper die 2 and a lower die 3. It is detachably fixed with bolts or the like. A holding furnace 4 that can be moved up and down is provided below the lower die base 3 so as to be able to communicate with the lower mold 1b via the stock 5.
[0014]
Further, an upper die lifting cylinder 6 connected to the upper die 2 via an upper end of a hollow piston rod 6b is provided on the outside of the die 1. The upper die raising / lowering cylinder 6 includes a cylinder tube 6a and the piston rod 6b, and an inner cylinder guide 6c configured to be capable of sliding with the piston rod 6b. Further, the upper die raising / lowering cylinder 6 is provided with an inner cylinder guide 6c, so that the upper die base 2 and the upper die 1a can be raised and lowered horizontally and smoothly.
[0015]
At least one columnar fall prevention means 7 is provided on the opposite side of the upper die lifting cylinder 6, and this fall prevention means 7 has a wedge-shaped mechanism and is connected to the upper die base 2. Has been. The fall prevention means 7 serves as a guide when the upper mold elevating cylinder 6 moves up and down, and can be prevented by wedge when the hydraulic pressure is stopped.
[0016]
A product extrusion cylinder 8 is provided above the upper die 2. The holding furnace 4 is configured to be movable up and down by a holding furnace elevating cylinder 9, the lower end of the upper mold elevating cylinder 6 is fixed to the base 10, and the columnar fall prevention means 7 is also connected via a column 10a. The base 10 is fixed. Further, the lower die base 3 is fixed to the upper mold lifting cylinder 6 and the column 10a via a bracket (not shown). The upper die lifting cylinder 6 is composed of two to four.
[0017]
The operation of the low-pressure casting apparatus for carrying out the present invention will be described below. In the state shown in FIG. 1, by applying hydraulic pressure to the lowering hydraulic chamber 6e of the upper die lifting cylinder 6, the piston rod 6b operates downward to lower the upper die 2, and the upper die 1a is lowered. The mold 1b comes into close contact with the mold 1b (FIG. 2).
[0018]
After clamping, after passing through pressurized hot water and cooling process, by applying hydraulic pressure to the rising hydraulic chamber 6d of the upper die lifting cylinder 6, the piston rod 6b operates upward and the upper die 2 rises. Then, the upper mold 1a is separated from the lower mold 1b and the mold is opened. Thereafter, the product is extracted by the product extrusion cylinder 8, and then the product is taken out of the device by the product take-out device 11.
[0019]
In such a mold casting, a release force at the time of mold opening is often required more than mold clamping. In order to cope with this, the upper die lifting cylinder 6 has a larger pressure receiving area in the rising hydraulic chamber 6d than in the lowering hydraulic chamber 6e, and a larger output is obtained in the mold opening process than in the mold clamping process. It is supposed to be.
[0020]
The holding furnace 4 is raised and lowered by a holding furnace raising / lowering cylinder 9 and is raised during machine operation, and the upper surface of the stalk 5 and the gate of the lower mold 1b are in close contact with each other. In addition, a mechanical wedge mechanism (not shown) is installed in the lower part of the holding furnace 4 so that the holding furnace 4 does not descend even when an emergency such as a hydraulic pump (not shown) is stopped.
[0021]
In the present invention, the structure for preventing the holding furnace 4 from descending is not limited to the mechanical wedge mechanism, and may be constituted by a hydraulic circuit.
[0022]
【The invention's effect】
The present invention, as apparent from the above description, a simple adjustment with conveyance and set, effect on an equal casting industry yet can be made compact ones are Chodai.
[Brief description of the drawings]
FIG. 1 is a partially sectional schematic front view showing a mold opening state of a low pressure casting apparatus for carrying out the present invention.
FIG. 2 is a schematic front view showing a clamping state of a low-pressure casting apparatus for carrying out the present invention.
FIG. 3 is a schematic view showing a conventional mold casting apparatus.
[Explanation of symbols]
1 Mold 1a Upper mold 1b Lower mold 4 Holding furnace 6 Upper mold lifting cylinder 6b Piston rod

Claims (1)

A mold casting upper mold operating method for obtaining a cast product by pouring molten metal in a holding furnace into a cavity of a clamped horizontal split upper and lower mold, and contracting a plurality of upper mold lifting cylinders By the operation, the process of lowering the upper mold that has been opened with the piston rod of the upper mold lifting cylinder and closing the mold is performed, and the molten metal is poured into the cavity of the upper and lower molds that have been clamped and cooled. a step of, by extension operation of the plurality of upper mold elevating cylinder, and a step of opening the mold to separate from the lower mold by the piston rod and is integrally rise of the upper mold lifting cylinder the upper die Yes, and outputs of the plurality of upper mold elevating cylinder in the mold opening process is, on the metal mold casting by the horizontal split die, characterized that you have been made larger than in the mold clamping step Mold operation method.

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