JP2002331345A - Low speed high pressure casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low speed high pressure casting apparatus capable of suppressing the generation of an oxide (oxide film) when feeding a molten metal in a metal mold cavity. SOLUTION: An inert gas injection opening 6 is formed near a sleeve 2 or a molten metal inflow opening 4 of the sleeve, and after the inert gas such as argon is supplied from the injection opening 6 into the sleeve, the molten metal from its inflow opening 4 is filled in the metal mold cavity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold in which a sleeve is vertically connected to a sprue of a mold, a molten metal inlet is formed in the middle of the sleeve, and the molten metal is injected into the mold cavity from the molten metal inlet. The present invention relates to a low-speed and high-pressure casting apparatus in which a molten metal in the cavity is pressurized at a low speed and a high pressure and cast by moving a pressurizer fitted and inserted into the sleeve toward the sprue after filling at a low speed and a low pressure. It is.

[0002]

2. Description of the Related Art Products cast by this kind of low-speed high-pressure casting machine have almost no casting cavities (pinholes) inside, have a clean casting surface, have excellent dimensional accuracy, and at the same time, have a finer structure, resulting in a machine having a fine structure. It has excellent features such as improved mechanical properties. However, unlike the case of ordinary die casting, air is not involved when filling the molten metal into the mold cavity, but when supplying the molten metal into the mold cavity,
In particular, the tip portion of the molten metal (which is generally referred to as a tip) is likely to be oxidized by contact with the atmosphere, and the generated oxide (oxide film) may be mixed into the cast product. If an oxide (oxide film) is mixed in the product, the strength of the product will be reduced. Therefore, make sure that the oxide (oxide film) does not mix in the product, or minimize the formation of the oxide (oxide film). It is desired to do.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such a demand, and it is possible to suppress generation of an oxide (oxide film) when supplying a molten metal into a mold cavity. It is intended to provide a low-speed, high-pressure casting apparatus.

[0004]

According to a first aspect of the present invention, there is provided a low-speed and high-pressure casting apparatus according to the present invention, wherein a sleeve is vertically connected to a sprue of a mold, and molten metal is provided at an intermediate portion of the sleeve. An inflow port is formed, and after filling the molten metal into the mold cavity at a low speed and a low pressure from the molten metal inflow port, the pressurizer fitted and inserted into the sleeve is advanced toward the pouring portion to remove the molten metal in the cavity. In a casting apparatus for casting by pressurizing at a low speed and a high pressure, an inert gas injection port is formed in the sleeve at a position lower than a pressurization standby position of the pressurizer, and an inert gas is injected into the sleeve from the inert gas injection port. After the gas is supplied, the pressurizing element is made to stand by at the pressurizing standby position, the inert gas inlet is closed with the pressurizing element, and the molten metal is filled in the mold cavity from the molten metal inlet. It is obtained by the features. Further, in the low-speed and high-pressure casting apparatus according to the second aspect, the sleeve is vertically connected to the gate of the mold, a molten metal inlet is formed in the middle of the sleeve, and the molten metal is introduced into the mold cavity from the molten metal inlet. After filling the molten metal at a low speed and a low pressure, a pressurizer fitted and inserted into the sleeve is advanced toward the gate, and the molten metal in the cavity is pressed at a low speed and a high pressure to cast the molten metal. An inert gas inlet is provided near the molten metal inlet, and after the inert gas is supplied into the sleeve from the inert gas inlet, the molten metal is filled into the mold cavity from the molten metal inlet. It is a characteristic.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the illustrated embodiment, and various variations are considered. Can be FIG. 1 shows an example of an embodiment of a low-speed and high-pressure casting apparatus according to claim 1, and FIG. 2 shows an example of an embodiment of a low-speed and high-pressure casting apparatus according to claim 2. And a duplicate description is omitted.

The low-speed and high-pressure casting apparatus according to the present invention basically includes a mold 1 comprising a pair of fixed molds 1a and movable molds 1b which open in the left-right direction in the drawing, and a fixed mold 1a and a movable mold 1b. A sleeve 2 vertically connected to a sprue portion 12 formed below a cavity 11 to be formed, a pressurizer 3 inserted into the sleeve 2 so as to be able to advance and retreat, and an intermediate portion of the sleeve 2 The connection port 5 of the water heater A is connected to the melt inlet 4 and the molten metal supplied from the connection port 5 of the water heater A flows from the melt inlet 4 into the sleeve. The pressurizing element 3 is supplied into the mold cavity 11 at a low speed and a low pressure from the sleeve 2 through the sprue section 12 and then into the mold cavity 11. Mold cavity 11 It has a mechanism that the product is cast by pressurizing the molten metal at a low speed and high pressure.

In particular, in the low-speed and high-pressure casting apparatus according to the first aspect, the sleeve 2 has an inert gas inlet 6.
After supplying an inert gas such as argon gas into the sleeve 2 from the inert gas inlet 6, the molten metal is filled from the molten metal inlet 4 into the mold cavity 11 at a low speed and a low pressure. is there.

That is, an inert gas inlet 6 is formed in the sleeve 2 at a position lower than a pressurizing standby position of the pressurizer 3 (a position indicated by a virtual line in the drawing). This is for connecting the gas supply pipe 7 of the gas supply device in communication.

In the case of the low-speed and high-pressure casting apparatus according to the first aspect, when the mold cavity 11 is filled with the molten metal, the pressurizing element 3 inserted into the sleeve 2 is injected with an inert gas. The inert gas such as argon gas is supplied into the sleeve 2 from the inert gas inlet 6 in this state by lowering to a position slightly below the inlet 6 (a position indicated by a solid line in the drawing). Then, an inert gas such as argon gas spreads to the inside of the mold cavity 11 through the sprue portion 12 and to the inside of the connection port 5 of the hot water supply device A through the molten metal inflow port 4 as well as the inside of the sleeve 2. From inside to the inside of the mold cavity 11, the atmosphere inside the portion where the molten metal flows is replaced with the inert gas. The atmosphere and excess inert gas from the inside of the sleeve 2 to the inside of the mold cavity 11 are discharged to the outside of the mold cavity 11 through the vent mechanism 10. Then, after supplying a predetermined amount of the inert gas, the pressurizing element 3 in the sleeve 2 is raised to a pressurizing standby position (a position indicated by a phantom line in the drawing), and the inert gas inlet 6 is moved to the pressurizing element. 3 and close at the same position. In this state, the molten metal is supplied from the connection port 5 of the hot water supply device A through the molten metal inflow port 4 to the inside of the sleeve 2 →
The sprue section 12 → supply and fill the mold cavity 11 with a low pressure at a low pressure.
2, the product is cast by pressing the molten metal in the mold cavity 11 at low speed and high pressure.

Further, in the low-speed and high-pressure casting apparatus according to the second aspect, an inert gas inlet 6 is provided near the molten metal inlet 4 of the sleeve 2, and argon gas or the like is introduced into the sleeve 2 from the inert gas inlet 6. After the inert gas is supplied, the molten metal is filled from the molten metal inflow port 4 into the mold cavity 11 at a low speed and a low pressure.

Here, the vicinity of the molten metal inlet 4 of the sleeve 2 means the vicinity of the molten metal inlet 4 located outside the sleeve 2 which is not affected by the reciprocating operation of the pressurizer 3. Connection port 5 of water heater A connected to inlet 4
The inert gas injection port 6 faces the upper position of. More specifically, between the molten metal supply pipe 8 and the connection port 5 of the hot water supply apparatus A, a hot water supply connection block 9 that rises vertically so that the molten metal surface M approaches the connection port 5 is interposed and installed. An inert gas inlet 6 is provided at an upper position of 5 so as to face the molten metal surface M.

Thus, in the case of the low-speed and high-pressure casting apparatus according to the second aspect, when the mold cavity 11 is filled with the molten metal, the pressurizing element 3 inserted into the sleeve 2 is set at the pressure standby position. (At the position shown by the solid line in the drawing)
Open the valve 6a and insert the sleeve 2 through the inert gas inlet 6.
An inert gas such as an argon gas is supplied into the inside. Then
An inert gas such as argon gas covers the molten metal surface M in the hot water supply connection block 9 from near the molten metal inflow port 4, and also passes through the molten metal inflow port 4 from the inside of the sleeve 2 to the inside of the mold cavity 11 through the sprue portion 12. From the inside of the hot water supply connection block 9 to the inside of the mold cavity 11, the atmosphere inside the portion where the molten metal flows is replaced with the inert gas. Then, after supplying a predetermined amount of the inert gas, the valve 6a is closed, and the molten metal flows from the connection port 5 of the hot water supply device A through the molten metal inflow port 4 at a low speed from the inside of the sleeve 2 → the gate section 12 → the mold cavity 11. Supply and fill at low pressure. At this time, because of the low speed and low pressure, the molten metal does not enter the valve or the connection pipe. After that, the pressing element 3 in the sleeve 2
Is advanced to the inside of the sprue portion 12 so that the mold cavity 11
The product is cast by pressing the molten metal at low speed and high pressure.

[0013]

According to the low-speed and high-pressure casting apparatus according to the first aspect of the present invention, an inert gas injection port is formed in the sleeve, and an inert gas such as argon gas is supplied into the sleeve from the inert gas injection port. After filling the molten metal into the mold cavity from the molten metal inlet, the molten metal is supplied and filled into the mold cavity from the molten metal inflow port of the sleeve. Inert gas such as argon gas spreads to the inside and the inside of the connection port of the hot water supply device, and the atmosphere inside the portion where the molten metal flows from the inside of the sleeve to the inside of the mold cavity is replaced with the inert gas. Therefore, when supplying the molten metal into the mold cavity, it is possible to suppress generation of an oxide (oxide film).

According to the low-speed and high-pressure casting apparatus of the second aspect of the present invention, an inert gas inlet is provided near the molten metal inlet of the sleeve, and argon gas or the like is introduced into the sleeve from the inert gas inlet. Since the molten metal is supplied and filled into the mold cavity from the molten metal inflow port after supplying the inert gas, the inert gas such as argon gas is supplied to the inside of the connection port of the water heater, the inside of the sleeve and the mold cavity. , And from the inside of the connection port of the hot water supply device to the inside of the mold cavity, the atmosphere inside the portion through which the molten metal flows is replaced with the inert gas. Therefore, when supplying the molten metal into the mold cavity, it is possible to suppress generation of an oxide (oxide film). Moreover, this claim 2
According to the low-speed and high-pressure casting apparatus according to the present invention, the molten metal in the mold cavity is pressurized by the pressurizer, and the pressurizer returns to the original position, and at the same time, the inert gas can be supplied from the inert gas injection port. The molten metal in the vicinity of the molten metal inflow port of the sleeve is not exposed to the air throughout the entire casting process, so that the generation of oxides (oxide films) can be effectively suppressed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a low-speed and high-pressure casting apparatus according to claim 1 of the present invention.

FIG. 2 is a schematic sectional view showing an example of an embodiment of a low-speed and high-pressure casting apparatus according to claim 2 of the present invention.

[Explanation of symbols]

1: Mold 1a: Fixed mold 1b: Movable mold 11: Cavity 12: Sluice section 2: Sleeve 3: Pressurizer 4: Melt inlet 5: Connection port 6: Inert gas inlet 7: Gas supply pipe 8: Melt Supply pipe 9: Hot water supply connection block 10: Vent mechanism A: Hot water supply device M: Hot water surface

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Minetaka Fujita 1540-8 Higashimisono, Hamakita City, Shizuoka Prefecture (72) Inventor Makoto Akase 3-10-25 Hagioka, Hamamatsu City, Shizuoka Prefecture Maison Center 202 (72) Inventor Suzuki Katsuzo 2008 Hiraguchi, Hamakita City, Shizuoka Prefecture (72) Inventor Ryo Ikui 27-14 Bunkamachi, Hamamatsu City, Shizuoka Prefecture Diaz Bunka 102

Claims (2)

[Claims] 1. A sleeve is vertically connected to a gate of a mold, and a molten metal inlet is formed in a middle part of the sleeve.
After filling the mold cavity with the molten metal at a low speed and a low pressure from the molten metal inlet, the pressurizer fitted into the sleeve is advanced toward the spout to pressurize the molten metal in the cavity at a low speed and a high pressure. In the casting apparatus for performing casting, an inert gas injection port is formed in the sleeve at a position lower than a pressurization standby position of the pressurizer, and an inert gas is supplied from the inert gas injection port into the sleeve. The pressurizing element is made to stand by at a pressurizing standby position, the inert gas inlet is closed with the pressurizing element, and the molten metal is filled in the mold cavity from the molten metal inlet through the low-speed high-pressure. Casting equipment. 2. A sleeve is vertically connected to the gate of the mold, and a molten metal inlet is formed in the middle of the sleeve.
After filling the mold cavity with the molten metal at a low speed and a low pressure from the molten metal inlet, the pressurizer fitted into the sleeve is advanced toward the spout to pressurize the molten metal in the cavity at a low speed and a high pressure. In the casting apparatus, an inert gas inlet is provided near the molten metal inlet of the sleeve, and an inert gas is supplied from the inert gas inlet into the sleeve. A low-speed, high-pressure casting apparatus characterized in that a molten metal is filled in the casting machine.