JPH02192868A - Pressurized casting apparatus - Google Patents

Abstract

PURPOSE:To supply molten metal at the fixed quantity with high accuracy for a short time and to execute the pressurized casting by using construction ingeniously assembling a sleeve cylinder, molten metal supplying cylinder, branching tube, molten metal surface detecting sensor and plunger tip, etc. CONSTITUTION:By supplying compressed air into a supplying/discharging hole 10, the molten metal R is pushed up through a stoke tube 9 and molten metal supplying cylinder 7, and when the molten metal R reaches to the dotted line position in the sleeve cylinder 6, the molten metal R is brought into contact with a molten metal surface sensor 12 at the same level position, and the supply of the compressed air from the supplying/discharging hole 10 is interrupted and the pressure in a holding furnace 8 is held. Successively,the plunger tip P is pushed up and the communication between the sleeve cylinder 6 and the molten metal supplying cylinder 7 is temporarily stopped under shut-off condition, and the compressed air holding in the holding furnace 8 is vented and the molten metal R in the molten metal supplying tube 7, branching tube 11 and stoke tube 9 is returned back to the holding furnace 8. Successively, after reducing the pressure in cavity 4, the plunger tip P is further risen by the fixed distance, the weighed molten metal R is poured into the cavity 4 and also held under pressurizing condition. After the lapse of the prescribed time, when the molten metal R solidifies, the plunger tip P is returned back to take out the casting.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pressure casting apparatus that solidifies molten metal poured into a mating mold under high pressure using a plunger.

(Prior Art and Problems) In recent years, in order to obtain high-quality cast products, pressure casting methods in which molten metal is solidified under high pressure using a plunger have been actively researched and put into practical use.

Furthermore, in order to constantly cast cast products of the same quality, in addition to pressurized conditions, precise metered supply of molten metal is required.

However, in order to precisely measure and supply molten metal, it is necessary to go through a complicated process, and during this process, oxides may be involved, and the temperature of the molten metal may drop unevenly (due to mold or plunger mechanism). (contact parts) and new defects occur in the cast product, so at present no good equipment has been realized that performs pressurized casting by supplying hot water in a precise quantity.

(Objective) The present invention has been made in view of the above, and an object of the present invention is to provide an apparatus for supplying hot water in a highly accurate quantity in a short period of time and performing pressure casting.

(composition) The configuration of the present invention will be explained in detail below using illustrated examples.

In the figure, (1) is a perforated tape p, and on the tape Iv (1) is a mating mold (D) composed of a lower mold (2) and an upper mold (3). The combined mold (D) has a cavity (4) defined therein, and the lower mold (2) has a molten metal inlet (5) communicating with the cavity (4). It's worn.

A sleeve cylinder (6) is vertically connected to the molten metal inlet (5), and a plunger tip ω) connected to a defunger cylinder (not shown) is installed in the sleeve cylinder (6). It is fitted in such a way that it can be slid up and down from below.

A downwardly inclined hot water supply pipe (7) is connected to the upper position of the sleeve f\N (6), and the lower end of the hot water supply pipe (7) is 1. It is connected to the upper end of the stalk pipe (9) of the molten metal holding furnace (8) whose interior is sealed.

The molten metal holding furnace (8) is provided with a compressed air supply/exhaust port (10), and by supplying compressed air into the holding furnace (8), the molten metal (outside the stalk pipe (9) and the hot water supply pipe ( The molten metal (R) in the hot water supply pipe (7) and the stalk pipe (9) is pumped up and supplied into the sleeve cylinder (6) through the pipe 7), and then exhausted in that state to cause the molten metal (R) in the hot water supply pipe (7) and the stalk pipe (9) to flow into the holding furnace (8). Furthermore, the lower end of a branch pipe (11) extending vertically upward is connected to the upper side of the lower end of the hot water supply pipe (7). A hot water level detection sensor (1
The lower end of the molten metal level detection sensor (12) is located in the sleeve cylinder (2) in consideration of the capacity of the cavity (4) of the mating mold (D) and the pressurizing conditions. 6) The plunger tip (P) inside the hot water pipe (
7) and the sleeve cylinder (6) are located at a predetermined height from the state where communication is cut off.

Moreover, when the hot water level detection sensor (12) detects the hot water level, it issues a signal to operate a compressed air supply mechanism (not shown) to interrupt the supply of compressed air into the holding furnace (8) and maintain the pressure. It's like that.

(Function) The device configured as above has the supply/discharge port (
Supply compressed air to 7 talk tubes (9
) and the hot water supply pipe (7), and when the molten metal (R) reaches the dotted line position of the sleeve cylinder (6), the molten metal (R) comes into contact with the molten metal level detection sensor (12) placed at the same level position. The supply of compressed air from the supply/discharge port (1) is interrupted and the pressure inside the holding furnace (8) is maintained.

Next, a cylinder (not shown) operates to push up the plunger tip CP), and the plunger tip CP) is temporarily stopped in a state where communication between the sleeve tube (6) and the hot water supply pipe (7) is cut off.During this time, the sleeve tube ( 6) Molten metal (
11O flows down toward the hot water supply pipe (7) by the volume that the plunger tip (P) rises and returns to the holding furnace (8). Therefore, the upper surface level of the molten metal (R) in the sleeve cylinder (6) does not change, and a predetermined amount of the molten metal (R) always remains above the plunger tip (P).

In this state, the compressed air held in the holding furnace (8) is exhausted, and the molten metal (R) in the hot water supply pipe (7), branch pipe (11) and stalk pipe (9) is discharged into the holding furnace (8). is refluxed to.

Subsequently, after the pressure inside the cavity (4) is reduced, the cylinder (not shown) is activated again to raise the plunger tip (P) a certain distance further and inject the measured amount of molten metal (R) into the cavity (4). Hold pressure. When this state is maintained for a predetermined period of time and the molten metal (R) solidifies, the cylinder (not shown) operates in reverse and the plunger tip (P)
Return to the position shown in Figure 1, separate the upper mold (3) from the lower mold (2), take out the solidified casting, and transfer the upper mold (3) to the lower mold (2) again. In total, the state shown in FIG. 1 is obtained.

The above operation is repeated as one cycle.

(Effects) As is clear from the above description, the present invention has a sleeve tube,
With a structure that skillfully combines hot water supply pipes, branch pipes, hot water level detection sensors, Granger chips, etc., the molten metal can be precisely measured and pressure cast, which greatly shortens the process and eliminates oxides and It is now possible to constantly cast cast products of the same quality without entrainment of air and without casting defects due to a drop in the temperature of the molten metal, which has a significant effect.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the state before starting casting of the embodiment.

Claims (1)

[Claims] The molten metal inlet (5) provided at the bottom of the matching mold (D)
), the sleeve tube (6) is vertically connected and suspended, and a plunger tip (P) is installed in the sleeve tube (6).
The sleeve tube (
The upper end of a downwardly inclined hot water supply pipe (7) is connected in communication with the upper position of 6), and the lower end of the supply pipe (7) is supplied with compressed air to inject molten metal through the stalk pipe (9). A branch pipe (11) is connected to the upper end of the stalk pipe (9) of the molten metal holding furnace (8) configured to increase the pressure, and a branch pipe (11) extending upward is connected to the lower part of the hot water supply pipe (7). pipe (11)
A pressure casting device characterized in that a hot water level detection sensor (12) is provided in the