JPH0661360U - Stoke structure in low pressure casting machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a stow structure having a structure in which aluminum is not caught in a crimping surface in a low pressure casting machine of a type in which a lower die and a stork are communicated with each other or separated. With the goal. [Structure] A perforated plate 6 provided with a plurality of holes 6A, 6A corresponding to a plurality of gates 1A, 1A provided in a lower mold 1 is attached to an upper end of a stock tube 4 via a seal 7. Stoke structure in a low-pressure casting machine with a structure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stock structure in a low-pressure casting machine of a type in which a lower mold of upper and lower molds is separated from a stock pipe provided in a holding furnace and horizontally moved.

[0002]

[Prior art and problems]

 In recent years, in order to facilitate the work of the lower mold such as cleaning the lower mold and inserting the core into the lower mold, the lower mold of the upper and lower molds is separated from the stock pipe and horizontally moved to the outside of the machine. A low-pressure casting machine that operates outside the machine has been developed, and a patent application has been filed by the applicant. In addition, as for the stock pipe, those with a small diameter that tends to cause problems such as solidification of molten metal are avoided, and those with a large diameter that do not easily cause solidification of molten metal tend to be used. When there are a plurality of gates, the plurality of gates are communicated with one large diameter stock pipe.

However, in a case where a single stock pipe is connected to a plurality of gates, the molten aluminum comes into contact with the lower surface of the lower mold other than the lower mold gate at the time of hot water supply, which solidifies and adheres to the lower mold. There was a problem that it got caught in the crimping part of the stock pipe and leaked water. The present invention has been made in view of the above problems, and in a low pressure casting machine of a type in which the lower die of the upper and lower dies is horizontally moved by separating it from the stock pipe installed in the holding furnace, the lower surface of the lower die is It is an object of the present invention to provide a stoke structure having a structure in which molten aluminum is not adhered to.

[0004]

[Means for solving problems]

 In order to achieve the above-mentioned problems, the stow structure in the low-pressure casting machine of the present invention comprises a holding furnace having a stock tube with an upper end protruding upward, and a holding furnace at an upper part of the holding furnace. Low-pressure casting machine composed of a lower die that can be moved up and down relatively to the furnace and horizontally, and that has a plurality of gates, and an upper die that can be raised and lowered above the lower die. In the stoker structure in Fig. 2, a perforated plate having a plurality of holes corresponding to a plurality of gates provided in the lower die is attached to the upper end of the stock pipe through a seal. It is characterized by that.

[0005]

[Action]

 Since the present invention adopts the above-mentioned solution, even if low pressure casting is performed by pressurizing the molten aluminum through the stock tube, the molten aluminum does not contact the lower surface of the lower die. , It only comes into contact with the lower surface of the perforated plate, which is not related to crimping with the lower die, and the solidified aluminum does not get caught.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. A lower die 1 attached to a horizontally movable lower die die base is provided with a plurality of gates 1A, 1A opening to the lower surface, and an upper portion of the lower die 1 can be lifted and lowered. An upper mold 2 attached to a not shown upper mold die base is provided. Further, below the lower mold 1, there is provided a holding furnace 3 which can be moved up and down through a not-shown lifting table, and the holding furnace 3 has a flange 4A at the upper end thereof at the center thereof. The stock tube 4 constituting the above-mentioned structure has its flange portion 4A engaged with and suspended from the lid member 3A of the holding furnace 3 via the seal 5, and the upper end portion thereof is slightly projected from the holding furnace 3. ing. A perforated plate 6 (see FIG. 2) having holes 6A, 6A for a plurality of sprues 1A, 1A provided in the lower mold 1 is provided on the upper portion of the stock pipe 4 through a seal 7. Are fixed together to form a stoke structure. In FIG. 1, the holding furnace 3 is lifted by a lifting table (not shown) with respect to the upper and lower molds 2 and 1 which are matched with each other, and the perforated plate 6 in the stow structure is pressed against the lower surface of the lower mold 1. The holes 6A, 6A of the perforated plate 6 and the gates 1A, 1A are in communication with each other.

With such a structure, in the state shown in FIG. 1, compressed air is supplied into the holding furnace 3 to pressurize the upper surface of the molten aluminum R to raise the inside of the stock tube 4 to raise the perforated plate 6. From the holes 6A, 6A of the lower mold 1 through the gates 1A, 1A of the lower mold 1, the cavity-C defined by the upper and lower molds 2, 1 is filled with pressure. This pressurized filling state is maintained until the molten aluminum R in the gates 1A, 1A and the cavity-C solidifies. On the other hand, the raised aluminum melt R contacts the lower surface of the perforated plate 6, but does not contact the lower surface of the lower die 1 except the gates 1A and 1A. After that, the supply of compressed air is stopped, the molten aluminum R in the stock tube 4 is lowered, and then the upper mold 2 is raised together with an upper mold die base (not shown) and separated from the lower mold 1 (casting product). Is attached to the upper mold 2) and the holding furnace 3 is lowered together with an elevating table (not shown) to separate the stoker structure from the lower mold 1.

At this time, a part of the molten aluminum R contacting the lower surface of the perforated plate 6 solidifies and adheres. Next, the lower mold 1 is horizontally moved together with a lower mold die base (not shown) to perform a necessary work, and the upper mold 2 performs a work for taking out a cast product. Next, the lower die 1 is moved back to above the holding furnace 3 together with a lower die base (not shown), and the holding furnace 3 is raised together with an elevating table (not shown) so that the upper surface of the perforated plate 6 of the stoke structure. Is pressure-bonded to the lower surface of the lower mold 1 to connect the sprues 1A, 1A and the holes 6A, 6A. At this time, since the aluminum solidified product is adhered only to the lower surface of the perforated plate 6, the lower surface of the lower mold 1 and the upper surface of the perforated plate 6 are pressure-bonded without aluminum biting. Next, the upper mold 2 is lowered together with the upper mold die base (not shown), and the lower mold 1 and the lower mold 1 are pressure-bonded to each other to obtain the state shown in FIG. 1, and the above operation is repeated.

[0009]

[Effect of device]

 As is apparent from the above description, the present invention has a structure in which a perforated plate having holes corresponding to a plurality of gates provided in the upper die is fixed to the upper portion of the stock pipe, so that the lower die and the stoker are attached. -It will be possible to prevent leakage of water due to aluminum being caught in the area where it is crimped.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing only a main part of a low pressure casting machine according to an embodiment of the present invention.

FIG. 2 is a plan view of a perforated plate.

[Explanation of symbols]

 1 Lower mold 1A Gate 2 Upper mold 3 Holding furnace 4 Stoke tube 6 Hole plate 6A hole 7 Seal R Aluminum molten metal

Claims (1)

[Scope of utility model registration request] 1. A stock pipe 4 having an upper end protruding upward.
And a lower mold 1 provided with a plurality of gates 1A and 1A that can be moved up and down relative to the holding furnace 3 and can be horizontally moved in the upper part of the holding furnace 3. A stoke structure in a low-pressure casting machine configured with an upper mold 2 that can be moved up and down above the lower mold 1, wherein a plurality of stoke structures provided on the lower mold 1 are provided at the upper end of the stock pipe 4. Spout 1
A stoker structure in a low-pressure casting machine, wherein a perforated plate 6 having a plurality of holes 6A, 6A corresponding to A and 1A is attached via a seal 7.