JP2003136212A - Low speed and high pressure casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low speed and high pressure casting apparatus with which molten metal remained in a flowing-in hole for molten metal can smoothly be returned back to a molten metal supplying device side during pressurizing the molten metal in a cavity by advancing a pressurizing element. SOLUTION: In the pressurizing element 3, an opening groove 31 communicating the flowing-in hole 4 for molten metal with the outside is formed, or near the flowing-in hole 4 for molten metal, a switch valve 6 communicating the flowing-in hole 4 for molten metal with the outside is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a sleeve vertically connected to a sprue part of a 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. A low-pressure high-pressure casting apparatus for pressurizing the molten metal in the cavity at a low speed and a high pressure by advancing the pressurizer inserted into the sleeve toward the sprue part after the low-speed low-pressure filling Is.

[0002]

2. Description of the Related Art In a low-speed high-pressure casting apparatus of this type, while a pressurizer is advanced to pressurize the molten metal in the cavity,
In preparation for the next casting, it is necessary to return the molten metal remaining in the molten metal inlet to the hot water supply device side. However, in the conventional casting apparatus, since the molten metal inlet formed structurally in the middle of the sleeve is closed by the pressurizer, the molten metal remaining in the molten metal inlet is difficult to return to the hot water supply device side.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation as described above. While the pressurizer is moved forward to pressurize the molten metal in the cavity, it remains in the molten metal inlet. It is intended to provide a low-speed high-pressure casting device capable of smoothly returning the molten metal to the hot water supply device side.

[0004]

The low-speed high-pressure casting apparatus according to claim 1 of the present invention which achieves the above object has a sleeve vertically connected to a sprue part of a die, and a molten metal is provided in a middle part of the sleeve. The molten metal in the cavity is formed by forming an inflow port, and filling the molten metal in the mold cavity from the molten metal inflow port at a low speed and a low pressure, and then advancing the pressurizer inserted into the sleeve toward the molten metal port. In a casting apparatus for pressurizing at a low speed and a high pressure, the molten metal inlet is provided at a position corresponding to the molten metal inlet where the tip of the pressing member passes through the molten metal inlet and reaches the forward limit. It is characterized in that an open groove is formed to communicate the outside with the outside. Further, in the low-speed high-pressure casting apparatus according to claim 2, a sleeve is vertically connected to a sprue part of a mold, a molten metal inlet is formed in a middle part of the sleeve, and the molten metal flow inlet enters the mold cavity. In a casting apparatus for casting the molten metal in the cavity at a low speed and a high pressure by advancing the pressurizer inserted into the sleeve after filling the molten metal at a low speed and a low pressure,
An opening / closing valve is provided near the molten metal inlet for communicating the molten metal inlet with the outside.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, specific preferred embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the illustrated embodiments, and various variations can be considered. To be 1 to 4 show an example of implementation of a low-speed high-pressure casting apparatus according to claim 1, and FIGS.
Shows an example of the implementation of the low-speed high-pressure casting apparatus according to claim 2, but the same reference numerals are given to the same components throughout the drawings, and duplicated description will be omitted.

The low-speed high-pressure casting apparatus according to the present invention basically comprises a mold 1 composed of a pair of a fixed mold 1a and a movable mold 1b which are opened in the left-right direction in the drawing, a fixed mold 1a and a movable mold 1b. A sleeve 2 vertically connected to a spout 12 formed below a cavity 11 formed therein, a pressurizing element 3 inserted into the sleeve 2 so as to be capable of advancing and retracting, and a middle portion of the sleeve 2. The molten metal inlet 4 is formed as an opening, and the molten metal inlet 4 is connected to the hot water supply connection block 5 of the hot water supply device A. The molten metal M1 supplied from the hot water supply connection block 5 of the hot water supply device A is 4 to the inside of the sleeve 2, and from the sleeve 2 to the sprue part 12
Through the mold cavity 11 at low speed and low pressure,
After that, the pressurizing element 3 fitted into the sleeve 2 is advanced to the inside of the sprue part 12 to pressurize the molten metal M2 in the mold cavity 11 at a low speed and a high pressure so that a product is cast. There is.

Particularly, in the low-speed high-pressure casting apparatus according to the first aspect, while the pressurizing element 3 is advanced to pressurize the molten metal in the mold cavity 11, the molten metal inlet 4 is prepared for the next casting. An open groove 31 is formed in the pressurizer 3 for communicating the molten metal inlet 4 with the outside so that the remaining molten metal M can easily return to the hot water supply device A side. That is, when the pressurizer 3 is advanced to pressurize the molten metal M2 in the mold cavity 11, the tip 3a of the pressurizer 3 passes through the molten metal inlet 4 of the sleeve 2 and advances to the outer peripheral surface of the pressurizer 3. By forming an open groove 31 along the axial direction from a position corresponding to the melt inlet 4 in a limit range, and by communicating the melt inlet 4 with the outside of the sleeve 2 through the open groove 31, the melt inlet 4 is formed. The molten metal M1 ′ remaining therein is configured to easily return to the hot water supply device A side. The open grooves 31 of the illustrated embodiment are arranged at equal intervals along the outer peripheral surface of the pressurizer 3 so as to surely correspond to the molten metal inlet 4 even if the pressurizer 3 rotates in the circumferential direction during operation. The open groove 31 is formed not only along the outer peripheral surface of the pressurizer 3, but also through the inside of the pressurizer 3 from a position corresponding to the molten metal inlet 4. You may form so that it may lead to.

According to the low-speed high-pressure casting apparatus of the first aspect, the pressurizing element 3 fitted in the sleeve 2 is located slightly below the molten metal inlet 4 (the position shown by the solid line in FIG. 1). )
Then, the molten metal M1 is supplied from the hot water supply connection block 5 of the hot water supply device A through the molten metal inlet 4 to the inside of the sleeve 2 → the spout 12 → the inside of the mold cavity 11 at a low pressure to be filled ( After that, the pressurizing element 3 in the sleeve 2 is advanced to the inside of the sprue portion 12 to pressurize the molten metal M2 in the mold cavity 11 at a low speed and a high pressure to cast the product. At this time, the open groove 31 formed in the pressurizer 3 is reached while the tip 3a of the pressurizer 3 has passed through the molten metal inflow port 4 of the sleeve 2 and has reached the forward limit.
Part of the molten metal is communicated with the molten metal inlet 4 and the molten metal inlet 4 is communicated with the outside of the sleeve 2 through the open groove 31, so that the molten metal from the water heater A is synchronized with the forward movement of the pressurizer 3. At the same time as stopping the pressurization to M1, in preparation for the next casting, the inside of the hot water supply pot A1 is returned to atmospheric pressure and the on-off valve A2 of the hot water supply pot A1 is opened to bring the molten metal M in the constant temperature surface furnace A2 to a constant surface level. By introducing up to L, the molten metal M1 ′ remaining in the molten metal inlet 4 naturally becomes the hot water supply device A.
It comes to return to the side (state of FIG. 3). Then, when the molten metal M2 in the mold cavity 11 is solidified, the pressurizing element 3 is retracted to the initial position, the auxiliary mold 13 is opened, and the molten metal is generated from the molten metal inlet 4 to the solidified product outlet 14. The coagulated substance C is taken out (state of FIG. 4).

In the low-speed high-pressure casting apparatus according to the second aspect of the present invention, while the pressurizer 3 is moved forward to pressurize the molten metal in the mold cavity 11, the molten metal inlet is prepared for the next casting. An on-off valve 6 is provided near the molten metal inlet 4 so that the molten metal M1 ′ remaining in the molten metal 4 can easily return to the hot water supply device A side.

Here, the vicinity of the molten metal inlet 4 is the pressurizer 3.
Means the vicinity of the molten metal inlet 4 located outside the sleeve 2 that is not affected by the advancing / retreating movement of the hot water. 6 is provided. The on-off valve 6 of the illustrated embodiment has a communication hole 61 formed to be openable and closable by an on-off operation valve 62, and communicates with an upper position of the hot water supply connection block 5 that rises vertically from the molten metal supply pipe 7 of the hot water supply apparatus A. Although the hole 61 is provided so as to face the inside of the hot water supply connection block 5, the on-off valve 6 according to the present invention is not limited to that shown in the illustrated embodiment.

In the low-speed high-pressure casting apparatus according to the second aspect, the pressurizing element 3 fitted in the sleeve 2 is located slightly below the molten metal inlet 4 (the position shown by the solid line in FIG. 1). Down to stand by, and the communication hole 61 of the open / close valve 6 is closed by the open / close operation valve 62 so that the open / close valve 6 is not closed.
In this state, the molten metal M1 is supplied from the hot water supply connection block 5 of the hot water supply apparatus A through the molten metal inlet 4 to the inside of the sleeve 2 → the spout 12 → the inside of the mold cavity 11 at a low pressure to be filled (state of FIG. 5), After that, the pressurizer 3 in the sleeve 2 is advanced to the inside of the sprue part 12, and the molten metal M2 in the mold cavity 11 is pressurized at a low speed and a high pressure to cast the product. At this time, in synchronization with the forward movement of the pressurizer 3, the pressurization of the molten metal M1 from the hot water supply apparatus A is stopped, and at the same time, the inside of the hot water supply pot A1 is returned to atmospheric pressure in preparation for the next casting, and the open / close valve of the hot water supply pot A1 is opened. When A2 is opened and the molten metal M in the constant temperature furnace A2 is taken up to the constant level L, the level in the hot water supply connection block 5 immediately drops to the constant level L. The opening / closing valve 6 of the opening / closing valve 6 is slid to open the communication hole 61.
To open the on-off valve 6. Then, the molten metal inlet 4 is brought into communication with the outside through the on-off valve 6,
The molten metal M1 ′ remaining in the molten metal inlet 4 naturally returns to the hot water supply device A side (state of FIG. 6).

[0012]

According to the low-speed high-pressure casting apparatus according to the present invention, while the pressurizer is moved forward to pressurize the molten metal in the cavity, the molten metal remaining in the molten metal inlet is smoothly transferred to the hot water supply device side. It is possible to return to.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of an implementation of a low-speed high-pressure casting apparatus according to claim 1 of the present invention, in a state immediately before a molten metal is supplied into a mold cavity.

FIG. 2 is an enlarged schematic cross-sectional view of a main part showing a state immediately before pressurizing the molten metal in the mold cavity.

FIG. 3 is an enlarged schematic cross-sectional view of an essential part showing a state where the molten metal in the mold cavity is being pressurized.

FIG. 4 is an enlarged schematic cross-sectional view of a main part showing a state where a solidified product is being taken out from the auxiliary mold.

FIG. 5 is an enlarged schematic cross-sectional view of an essential part showing an example of the implementation of the low-speed high-pressure casting apparatus according to claim 2 of the present invention, showing a state immediately before pressurizing the molten metal in the mold cavity.

FIG. 6 is an enlarged schematic cross-sectional view of a main part showing a state where the molten metal in the mold cavity is being pressurized.

[Explanation of symbols] 1: Mold 1a: Fixed mold 1b: movable type 11: cavity 12: Gate 13: Auxiliary type 14: Solidified product outlet 2: Sleeve 3: Presser 31: Open groove 4: Molten metal inlet 5: Hot water supply connection block 6: On-off valve 7: Molten metal supply pipe A: Water heater

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B22D 35/04 B22D 35/04 A

Claims (2)

[Claims] 1. A sleeve is vertically connected to a sprue part of a mold, and a molten metal inlet is formed at a midway part of the sleeve,
The mold cavity is filled with the molten metal at a low speed and a low pressure from the molten metal inlet, and then the pressurizer fitted in 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 casting by casting, the pressurizer communicates the melt inlet with the outside at a position where the tip of the presser passes through the melt inlet and reaches the forward limit and corresponds to the melt inlet. A low-speed high-pressure casting apparatus characterized by forming an open groove. 2. A sleeve is vertically connected to a sprue part of a mold, and a molten metal inlet is formed in a middle part of the sleeve.
The mold cavity is filled with the molten metal at a low speed and a low pressure from the molten metal inlet, and then the pressurizer fitted in the sleeve is advanced toward the gate to press the molten metal in the cavity at a low speed and a high pressure. A low-speed high-pressure casting apparatus, wherein an on-off valve that connects the molten metal inlet and the outside is provided near the molten metal inlet.