JPH0475757A - Squeezing casting process - Google Patents

Abstract

PURPOSE:To reduce the contact of molten metal with the outer air, to prevent the oxidation thereof and to improve the quality by supplying the molten metal with a molten metal supplying tube communicated with a lower die, advancing an upper die, closing the hole of the molten metal supplying tube opened to the lower die to shut off the connection, then, advancing the upper die and squeezing the molten metal in a cavity in the upper and lower dies. CONSTITUTION:As the molten metal 51 in a molten metal holding furnace 50 is supplied to the lower die 30 by an electromagnetic pump 60 through the molten metal supplying tube 40 communicated with the lower die 30, a ladle is made unnecessary, and the contact of molten metal with the outer air can be drastically reduced, and as the molten metal is supplied to the lower die 30 in closed condition, the oxidation of molten metal is prevented thereby improving the quality of squeezed product. Furthermore, as the ladle, etc., is unnecessary, the mechanism is simplified and the stroke of upper die 20 can be shortened, and also the molten metal supplying operation is simplified by the electromagnetic pump 60. Therefore, by quick movement, the production efficiency can be improved.

Description

[Detailed description of the invention] [Industrial use! T] The present invention relates to a method for supplying molten metal for forging.

[Prior Art] Conventionally, molten metal forging using molten metal as a carbon material has been carried out in forging processing.

In molten metal forging like 1-, the mold is opened and 1. : State T' The molten metal is supplied in a steady state using a ladle.

For example, in the molten metal forging machine 100 shown in FIG.
A method of directly supplying hot water by transporting the water is adopted. 1. Between the upper die 111 and the lower die 112, as shown in the easy-to-forge box 110 in Fig. 11. :, inserted! 'Furthermore, a method of indirectly supplying hot water with a ladle 114 via a gutter 113 has been adopted.

[Problems to be solved by the invention] However, because the conventional hot water supply method uses a ladle hot water supply method, it takes time from pumping the molten metal from the hot water holding furnace to feeding it into the mold, resulting in a drop in the temperature of the molten metal. At the same time, since the molten metal is exposed to air, a molten compound is formed and mixed into the molten metal forged product! 7, there was a problem that the quality of the product deteriorated. Furthermore, in order to insert the IS hole 103 in the molten metal forged camphor tree 100 shown in FIG.
02 needs to be increased, and the movement stroke of the upper die 101 needs to be increased. Further, the molten metal forging machine 110 shown in FIG. 11 also requires a stolow for inserting the gutter 113, and also requires a mechanism to prevent the sakaki 113 from being pulled out during mold clamping. For this reason, the equipment becomes large and complex, which increases the cost of equipment and reduces production efficiency due to the complexity of operation.

The purpose of the present invention is to improve the quality of molten metal forged products by preventing molten metal from smelting. [L-Meaning Means 1 for Solving the Problems] In order to achieve the above object, the present invention provides a stand for forging molten metal by moving the upper mold forward and backward with respect to a fixed lower mold and supplying it to the lower mold. Forged camphor? In the S hot water forging method, l1
A predetermined tray of molten metal is supplied from the molten metal accumulation section through the hot water supply pipe ↓1'' that communicates with the lower mold, and then the upper mold is advanced with respect to the lower mold, and the hot water is supplied through the upper mold to the lower mold. of the tube [
After closing the mold and cutting off the communication between the lower mold and the hot water pipe, the upper mold was further advanced to 111, and a predetermined shape was also forged in the mold cavity formed by the upper and lower molds.

[Operation] Move forward against the upper mold and lower mold, and V! ! i! After closing the sprue of the lower die, the upper die is further advanced to perform forging into a predetermined shape.

[Example] An example of the present invention will be described below with reference to Drawing 1. In FIG. 1, the molten metal forging machine IO has an upper mold 20 and a lower mold 3.
There is a vertical molten metal forging machine 1' equipped with a vertical molten metal forging machine 1' and a vertical molten metal forging machine 1'. Equipped with an upper cavity. An extrusion bottle 22 is disposed at the center of each cavity 21, and this bottle 22 can be pushed into the cavity 21 by a drive device (not shown).In the center of the upper mold 20, there is a push-out bottle 22 for closing a sprue 41, which will be described later. A plunger 80 is provided and is movable in the vertical direction by an oil cylinder 70 located at the top. The lower mold 30 is connected to the cavity 21 of the upper mold 20.
8 Therefore, when the upper mold 20 descends and engages with the lower mold 30, cavities 21° 31 are formed and the gear bidet 421.31 is formed. A sealed space corresponding to the external shape of the cast product is formed between the lower racks 30 and 6J, and a sprue 41 is perforated in the lower surface of the lower mold 30 at a position corresponding to the plunger 80 of the upper mold 20. There is.

One end of a water supply 4v40 contacts the sprue 41 from below, and the other end of the water supply pipe 40 is communicated with a molten metal holding furnace 50.

The liquid level of the molten metal 51 in the molten metal holding furnace 50 is constantly maintained at 1T by automatic adjustment.

A magnetic pump 60 having a coil 61 surrounding a part of the hot water supply pipe 40 is disposed in the middle of the hot water supply pipe 40, and a magnetic field generated in accordance with the current applied to the coiled coil 61 pumps the inside of the hot water supply pipe 40. The molten metal 51 can be transferred in any direction without contacting the outside air.
It is wound by 0 to prevent solidification of the molten metal 51.

In this embodiment, which is configured as in 1:, the casting operation is performed according to the following procedure.

First, as shown in Fig. 2, the upper mold 20 and the lower mold 30 are placed in a standby state.
The molten metal 51 from the molten metal holding furnace 50 is introduced halfway into the hot water supply pipe 40 by slightly opening the gap between the molten metal and the molten metal holding furnace 50.

Next, the electromagnetic pump 60 is operated for a preset hot water supply time, and the molten metal 51 in the hot water supply pipe 40 is transferred in the forward direction, so that the molten metal 51 sequentially replenished from the molten metal holding furnace 50 is transferred from the sprue 41 to each cavity 31. (Figure 3).

After these hot water supply operations, the upper mold 20 is lowered, and the convex outer surface of the cavity 21 and the concave inner surface of the cavity 31 are fitted together to seal the spaces between the cavities 21 and 31 (Fig. 4).8 Next, The plunger 80 is lowered by the hydraulic cylinder 70 to close the water opening 41 (FIG. 5).

Thereafter, the excitation of the 111 magnetic pump 60 is stopped, and the molten metal 51 is caused to flow backward by its own weight, so that the molten metal 51 accumulated in the hot water supply pipe 40 is returned to the molten metal holding furnace 50i (Fig. 6). Forging is performed by compressing the heavy metal 51 inside by further submerging of 20 (Fig. 7) 5? 5. ．． l; Raise the second upper die 20 to dry the bottom, and operate the extrusion I7 bottle 22 (with the forged product 52
(Figure 8.9).

4: In the hot water supply pipe 40 connected to the sprue 41, there is a molten metal 51.
Hot water supply '11 so that it does not solidify on the inner peripheral surface! A heater 90 is installed to heat the 40mm.

[Effects of the invention W] As described above, the present invention has the following advantages: it eliminates the need for conventional ladles, greatly reduces the contact between the molten metal and the outside air compared to the ladle method, and reduces the impact on the lower mold. Since hot water can be supplied in a closed state, the oxidation of the heat source can be prevented and the quality of forged products can be greatly improved.In addition, the mechanism can be simplified since there is no need for a ladle, etc.
The transfer time of the upper mold can be shortened (this,
The electromagnetic pump also simplifies the feeding process by 41=sf (7) Therefore, the speed of operation improves production efficiency.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one embodiment of the present invention. FIGS. 2 to 9 are sectional views showing the operation of the same embodiments, and FIGS. 10 and 11 are schematic sectional views showing the conventional example. DESCRIPTION OF SYMBOLS 10... Molten metal forging machine, 20... Upper die, 21... Upper die cavity, 22... Extrusion bottle, 30... Lower die, 31... Lower die cavity, 40... Hot water supply tube, 41
... Sprue, 42... Molten metal feeding hole, 50... Molten metal holding furnace, 51... Melt 1.52... R manufactured product, 60... 1
11. Magnetic pump, 61... Coil, 70-... Hydraulic cylinder, 80... Plunger, 90... Heater, 1
00... Molten metal forging machine, 101... Upper die, 102...
- Lower die, 103... Ladle, 110-... Molten metal forging machine, 111... Upper die, 112... Lower die, 113...
Gutter, 114-... Ladle.

Claims (1)

[Claims] In a molten metal forging method for a vertical forging machine, in which an upper die is moved forward and backward relative to a fixed lower die, and the molten metal supplied to the lower die is forged, a predetermined amount of molten metal is removed from the molten metal accumulation part by a molten metal supply pipe communicating with the lower die. supplying molten metal, then advancing the upper mold with respect to the lower mold, and closing the mouth of the hot water pipe opened to the lower mold with the upper mold,
A method for forging molten metal using a vertical forging machine, in which after cutting off the communication between the lower mold and the hot water pipe, the upper mold is further advanced and forged into a predetermined shape in a mold cavity formed by both the upper and lower molds.