JP2580991Y2 - Stoke tube structure in low pressure casting machine - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention relates to the lower type of the upper and lower types,
The present invention relates to a stoked pipe structure in a low-pressure casting machine of a system for horizontally moving while being separated from a stoked pipe provided in a holding furnace.

[0002]

2. Description of the Related Art In recent years, in order to facilitate work on a lower die such as cleaning of a lower die and insertion of a core into the lower die, the lower die of the upper and lower dies has been separated from a stock pipe. A low-pressure casting machine that moves horizontally outside the machine and works outside the machine has been developed, and a patent application has been filed by the present applicant. In such a low-pressure casting machine, when casting is performed by the action of compressed air, the molten aluminum penetrates into the press-bonded surface portion between the stalk tube and the lower mold and solidifies to form the lower surface of the lower mold or the upper end surface of the stalk tube. However, when the burr is left as it is, the burr gradually increases, and finally the crimping between the lower mold and the stalk tube does not work well, causing a problem of leakage of hot water. The present invention has been made in view of the above-mentioned problems, and is directed to a low-pressure casting machine of a type in which a lower mold of the upper and lower molds is separated and separated from a stock pipe provided in a holding furnace and horizontally moved. It is an object of the present invention to provide a stoked pipe structure having a structure in which molten aluminum does not enter a crimping surface portion with a stoked pipe.

[0003]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned problems, a low pressure casting machine according to the present invention comprises a stalk tube structure comprising a holding furnace having a stalk tube and a holding furnace provided at an upper portion of the holding furnace. In a low-pressure casting machine comprising a lower mold that is vertically movable and horizontally movable relative to the furnace and has a sprue on the lower surface, and an upper mold that is capable of ascending and descending above the lower mold. A stoke pipe structure, wherein at the upper end of the stoke pipe, a tapered nozzle that can be inserted with a slight gap provided between the sprue and the sprue is provided, and at a base end outer peripheral surface of the nozzle portion, A flange portion having an upper surface formed in a horizontal plane pressed against the lower surface of the lower mold is provided, and the lower surface of the flange portion is engaged with the upper surface of the holding furnace, and the stoke pipe is suspended in the holding furnace. It is characterized by the following.

[0004]

According to the present invention, the above-mentioned solution is adopted, so that the molten aluminum during casting is formed in a vertical direction formed by a lower mold gate and a nozzle portion of a stoke pipe inserted in the lower mold. Although it enters into the extending gap, it does not enter the lower surface of the crimped lower mold and the crimping surface extending in the horizontal direction formed by the flange portion of the stork pipe, and accordingly, the lower surface of the lower mold and Eliminating the occurrence of burrs that hinder the pressing of the flange portion of the stoked tube with the flange portion is eliminated.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing only a main part of a low-pressure casting machine, and a lower die 1 attached to a lower die base (not shown) which is horizontally movable is provided with a spout 1A opening on the lower surface. An upper die 2 is mounted on the upper die 2 (not shown), which can be moved up and down, and is disposed above the lower die 1.
A is attached. Further, below the lower mold 1, a holding furnace 3 supported so as to be able to ascend and descend via an elevating table (not shown) is provided, and a stoke tube structure is provided at a central portion of the holding furnace 3. Hanged.

Now, the stoked tube structure will be described in detail. A tapered nozzle 4B is provided at the upper end of the stroke pipe 4A so as to be insertable with a slight gap S (see FIG. 3) provided in the gate 1A of the lower die 1. The tapered nozzle 4B
A flange-like flange portion 4C extending horizontally and having a horizontal upper surface is integrally provided on the outer peripheral surface of the base end portion to form a stroke pipe structure. The stoke pipe structure is configured such that the lower surface of the flange-shaped flange portion 4C is placed on the holding furnace 3.
The flange portion 4C and the nozzle portion 4B protrude above the holding furnace 3 from the upper cover member 3A via a seal 5.

In the above-mentioned structure, the upper die 2 is lowered together with an upper die (not shown) in the state shown in FIG. 1 so as to be matched with the lower die 1, and a holding furnace together with an elevating table (not shown). 3 is raised, the nozzle portion 4B of the stoked tube structure is inserted into the gate 1A, and the upper surface of the flange portion 4C is pressed against the lower surface of the lower mold 1. After that, pressurized air is supplied into the holding furnace 3, and the molten aluminum R rises inside the stoker tube 4A and fills the cavity C defined by the upper and lower molds 2.1 via the nozzle portion 4B, and the state shown in FIGS. 2 and 3 is obtained. At this time, the molten aluminum R also enters the gap S formed by the gate 1A and the nozzle portion 4B, but is held without reaching the lower end of the gap S as shown in FIG.

After maintaining this state until the molten aluminum R is solidified, the supply of compressed air to the holding furnace 3 is stopped, and the molten aluminum R in the stoking tube 4A is moved to the height position of the molten metal in the holding furnace 3. The upper mold 2 is raised and the holding furnace 3 is lowered. When the upper mold 2 is lifted, the casting W rises in a state where the casting W is attached to the upper mold 2 side, and the burr B portion which has entered the gap S and solidified as shown in FIG.
With the lower mold 1. Next, the lower die 1 is horizontally moved to perform necessary work on the lower die 1, and in the upper die 2, the cast product W is extruded from the upper die 2 by the action of the extrusion pin mechanism 2A and received by a product receiver (not shown). After being carried out of the machine, the lower mold 1 is returned to the position shown in FIG. 1 and the above operation is repeated.

[0009]

According to the present invention, as is apparent from the above description, a nozzle portion which can be inserted into the lower mold gate is provided at the tip of the stoker tube, and the lower surface of the lower mold is provided on the outer peripheral surface of the base end of the nozzle portion. In the casting, a molten aluminum is introduced into a vertical gap formed by a sprue and a nozzle, but the lower surface of the lower die and the flange are formed. Will not be able to enter the crimping surface with
There is no burr generated in the horizontal direction, and the burr generated vertically is taken out together with the product. Therefore, the lower surface of the lower mold and the flange are securely crimped,
No more water leaks.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a low-pressure casting machine for carrying out the present invention.

FIG. 2 is a cross-sectional view showing a main part in a casting state by a low-pressure casting machine embodying the present invention.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

FIG. 4 is a sectional view showing an upper mold state in a mold separation step.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower mold 1A Gate 2 Upper mold 3 Holding furnace 4A Stoke pipe 4B Nozzle part 4C Flange part B Burr S gap W Casting

Claims (1)

(57) [Scope of request for utility model registration] 1. A holding furnace 3 provided with a stoking tube 4A, and an upper part of the holding furnace 3 which is vertically movable relative to the holding furnace 3 and is horizontally movable, and has a spout 1A on a lower surface thereof. A stoke pipe structure in a low-pressure casting machine comprising a punched lower mold 1 and an upper mold 2 which can be moved up and down above the lower mold 1, wherein at the upper end of the stroke pipe 4 </ b> A, A tapered nozzle portion 4B which can be inserted with a slight gap S provided between the sprue 1A and the lower end of the lower mold 1 is provided on the outer peripheral surface of the base end portion of the nozzle portion 4B. A low pressure casting machine characterized in that a flange portion 4C to be formed is provided, the lower surface of the flange portion 4C is engaged with the upper surface of the holding furnace 3, and the stoking tube 4A is suspended in the holding furnace 3. Stoke tube structure.