JPS6124103B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of pouring metal into a mold in molten metal forging.

Conventionally, molten metal forging is carried out using a press equipped with upper and lower dies.The upper die is raised and the die is opened, and molten metal, which has already been weighed to a certain extent by another method, is poured into the cavity of the lower die. In this method, the metal is poured while being measured, and then the upper mold is lowered and pressure molded while maintaining a certain pressure. According to such a method, there is a large measurement error in the molten metal, which results in a dimensional error in the product and waste of material. Furthermore, it takes a considerable amount of time from measurement to pouring, closing the mold, and starting pressurization. Taking extra time for these steps is not only inefficient, but also makes it difficult to maintain the temperature of the molten metal. Various inventions have been made in pursuit of rapid and accurate quantitative pouring of molten metal, but this is not yet sufficient.

By the way, conventional casting is known to involve pouring molten metal into a mold and closing the injection port to the mold at the same time. Continuous automatic forging was difficult because it could not be forged and there was a risk that the molten metal would solidify in the injection pipe.

The present invention provides a method in which, in a press equipped with at least two upper and lower molds, the upper mold is lowered and temporarily stopped at a predetermined position where the lower mold is closed (this stopping means is stopped by a stopper supported by a spring on the mold); In this case, pressurize by overcoming the force of the spring with the next strong pressure drop.Alternatively, methods including mechanical, electrical, and hydraulic means such as controlling the press pump to control the position of the slide) Upper mold and lower mold. The cavity is filled with molten metal from the inlet of the lower mold by an appropriate means, and then
This is a method in which the inlet is closed with a plunger from an upper die provided at a position facing the inlet, and then pressure molding is performed while maintaining a certain pressure.

According to this method, even though the molding is performed using a forging press, the amount of molten metal poured into the cavity is directly measured and determined accurately by the gap between the upper and lower molds, improving the material yield and reducing the amount of metal poured into the cavity. There is no need to measure, and since the mold is already closed when pouring, the time from metering to the start of pressurization can be shortened, and the molten metal solidifies after pouring into the conduit pipe that communicates with the molten metal tank that pours into the cavity. It is possible to pour metal into the cavity continuously without any fear and without waiting time for melting one by one, which significantly improves the production efficiency of forming presses, which require a shortened time cycle, and improves quality. Improvements can also be made.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Representative embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is the main cylinder, 2 is the main ram, 3 is the slide, and 4 is the bed. A molten metal tank 5 is provided in the bed and kept warm or heated by an appropriate method to prevent the molten metal in the molten metal tank 5 from cooling. An upper mold 6 is provided on the lower surface of the slide 3, and a piston-type plunger 7 that can be slid up and down is provided inside the upper mold 6. 8
A lower mold is provided on the upper surface of the bed 4, and an inlet 9 for molten metal is provided at a position facing the plunger 7 of the upper mold 6.
10 is a split mold so that it can be opened and closed in an appropriate manner. Reference numeral 11 is an inlet pipe that connects the inlet 9 and the molten metal in the molten metal tank 5, and its lower end is provided so as to be immersed in the molten metal in the molten metal tank 5. 12 is the molten metal tank 5
It is constantly returned to the rear by a spring 13 by a piston of an air intake port provided at an appropriate position outside the cylinder.
Reference numeral 14 denotes an air intake port provided in the middle of the introduction pipe 11 at a position where it engages with the piston 12. After the slide 3 is stopped at the upper limit position in the press configured as described above, the split mold 10 is closed to the position shown in the drawing, and then the upper mold 6 is lowered to a predetermined closing position. (Position in drawing) At this time, plunger 7
is held at the upper limit position within the upper mold 6 by the pressure from the fluid inlet/outlet A (imaginary line in the figure). At this time, the piston 12 is simultaneously advanced by the pressure from the fluid inlet/outlet D to close the air intake port 14.

Next, when pressure is applied from the gas inlet/outlet C, the molten metal in the molten metal tank 5 rises in the introduction pipe 11 and fills the cavity formed by the upper mold 6, the lower mold 8, and the split mold 10. Next, the plunger 7 is lowered by pressure from the fluid inlet/outlet B, and the inlet 9 of the lower die 8 is lowered.
will be closed. Next, the pressure at the gas inlet/outlet C is relieved.

Next, by removing the pressure at the fluid inlet/outlet D, the piston 12 is moved back by the force of the spring 13 to open the air intake port 14, and the molten metal filling the introduction pipe 11 is allowed to descend. At the same time (the molten metal solidifies in the upper part), the upper mold 6 is lowered under pressure while maintaining an appropriate pressure to mold the product. After molding, the upper mold 6 is raised and the split mold 10 is retreated to take out the finished product. It is molded through the above steps.

Next, as shown in FIG. 2, the air intake port 14 shown in FIG. 1 is installed inside the plunger 7. To explain this, the upper mold 6 is lowered to the closed position. The explanation up to this point is the same as that of FIG.
At this time, the plunger 7 is held at the upper limit position within the upper die 6 by the pressure from the fluid inlet/outlet A. An air intake valve rod 15 is inserted into the plunger 7. This air intake valve rod 15 is constantly pulled up by a spring 16 to close the tip of the plunger 7 and the seat surface 18 of the air intake valve rod 15.

Next, when pressure is applied to the gas from the gas inlet/outlet C, the molten metal rises in the introduction pipe 11, forming a cavity formed by the upper mold 6, the lower mold 8, the split mold 10, etc.
to fill up. Next, the plunger 7 is lowered by the pressure from the fluid inlet/outlet B to close the inlet 9 of the lower mold 8. At this time, the air intake valve rod 15 is still attached to the spring 1.
6 closes the seat surface 18. Due to the subsequent increase in pressure from the fluid inlet/outlet B, the force of the spring 16 is overcome and the seat surface 18 opens, causing the gas communication pipe 1 to open.
The gas from 7 causes the inlet pipe 11 below the inlet 9 to
The molten metal inside is replaced by gas and descends.
(At this time, the pressure at the gas inlet and outlet is removed).

The following explanation is the same as that in FIG.

As described above, although the present invention is formed using a forging press, it is possible to quickly and accurately pour molten metal by simply filling the closed cavity with molten metal without the need for a separate metering device. Furthermore, when pouring the metal into the cavity, the slide is lowered and the upper die is pressurized to forge the molten metal into the desired mold, making it possible to obtain high-quality products extremely easily. Furthermore, since the molten metal is drawn back to the molten metal tank by introducing air into the conduit pipe that communicates with the molten metal tank after pouring, there is no risk of the molten metal solidifying in the conduit pipe that communicates with the inlet of the lower mold.
Molten metal can be continuously poured into the cavity without waiting for the time for melting to occur sequentially, and the production efficiency of forging press forming, which requires a severe time cycle, can be significantly improved, leading to remarkable progress in molten metal forging. be.

In the embodiment of the present invention, the hot water tank is housed in the bed, but it is obvious that it can be placed separately outside the press, and the molten metal can be directly introduced into the cavity of the mold using a pump or the like. It is also possible to do so as appropriate. Further, although a piston-type plunger is provided in the upper mold, it is also possible to easily provide a plunger in which only the piston portion is slid and penetrates the inside of the upper mold.

[Brief explanation of the drawing]

1 and 2 are schematic cross-sectional views of a molten metal forging machine according to the present invention. 1 is the main cylinder, 2 is the main ram, 3 is the slide,
4 is a bed, 5 is a molten metal tank, 6 is an upper mold, 7 is a plunger, 8 is a lower mold, 9 is an inlet, 10 is a split mold,
11 is an introduction pipe, 12 is an air intake piston,
13 is a spring, 14 is an air intake port, 15 is an air intake valve rod, 16 is a spring, 17 is a gas communication pipe, 18
is the seat surface.

Claims (1)

[Claims] 1 Open an inlet for the molten metal to flow into a predetermined cavity formed by the upper die attached to the slide for molten metal forging and the lower die attached to the bed, etc., into the lower die, which communicates with the molten metal tank through a conduit pipe. At the same time, a plunger capable of raising and lowering the upper mold is arranged opposite to the inlet of the lower mold so as to be able to freely block the inlet, and air is introduced into the upper end or side circumferential surface of the conduit that communicates the lower mold with the molten metal tank. After forming a cavity with the upper mold, lower mold, etc., by providing an air intake port that can be freely opened and closed, the molten metal in the molten metal tank is pushed up by pressure through a predetermined gas, and a conductive pipe communicating with the lower mold is formed. Then, the plunger of the upper mold is pushed down to close the inlet for the molten metal in the lower mold, and the slide is lowered to allow forging.Then, the pressure of the gas in the molten metal tank is released and the conduction pipe is opened. A method of pouring metal into a mold in molten metal forging, which is characterized by opening the air intake port of the molten metal and automatically returning the molten metal in the conduit to the molten metal tank to continuously forge the molten metal into a desired shape.