JPS6331814Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a metal frame for vertical casting in vacuum molding.

Normally, in vacuum molding, the mold surfaces protrude about 1 to 2 mm from the mating surfaces of the metal frames, and the mold surfaces are matched, so when the molds are matched, the mating surfaces of the metal frames are A pause occurs.

For this reason, when the mold is transported vertically, there is a problem such as sand spilling from the gap between the mating surfaces when the depressurization stops, and sand spilling when the vacuum pump stops due to a power outage or other reasons. The resulting dust generation, molten metal scattering, and restoration work, as well as the inability to stop the depressurization of the mold until the flask is disassembled after pouring the metal during normal work, require a large vacuum pump capacity. There were some problems. The present invention aims to solve these problems.

The configuration of the present invention will be explained below based on examples. A mold 1 is held under reduced pressure in a metal frame 2 placed vertically, and has a cavity surface 1a protruding from one mating surface 2a of the metal frame 2, and a back surface 1b protruding from the other mating surface 2b of the metal frame 2. The matched pair of molds 1, 1 forms a mold capitivity part C, and the rear surface 1b is connected to the adjacent mold 1.
A plurality of pairs are arranged in matching shapes on the back surface 1b. In addition, one of the mating surfaces 2a, 2a of the pair of matched metal frames 2, 2 has a lower part of the front opening 2c of the metal frame 2 when the metal frame 2 is oriented vertically. A highly elastic seal 3 is buried so as to surround both sides, and the seal 3 is formed on the mating surface 2a of the front part of the metal frames 2, 2 when the pair of molds 1, 1 are matched. , 2a. In addition, the mating surface 2b at the rear of the other metal frame 2 has a highly elastic material so as to surround the lower part and both sides of the rear opening 2d of the metal frame 2, similar to the mating surface 2a at the front of the metal frame 2. A seal 4 is embedded, and the seal 4 is higher than both mold parts protruding from the mating surfaces 2b, 2b behind both metal frames 2, 2 when the back surfaces 1b, 1b of the molds 1, 1 are overlapped. The dimensions are set. Reference numeral 5 denotes a decompression chamber provided around the outer periphery of the metal frame 2, which is connected to a vacuum pump (not shown). Reference numeral 6 denotes a filter pipe having air permeability, one end of which is connected in communication with the decompression chamber 5, and is provided at approximately equal pitches on the back surface of the frame via a support member 7.

As shown in FIG. 1, in this structure, a pair of molds 1, 1 are held under reduced pressure in a pair of metal frames 2, 2 and molded together, and a plurality of molds 1, 1 are placed on the back surface 1b,
1b are stacked on top of each other and arranged vertically, and while the mold 1 in the metal frame 2 is kept under reduced pressure by the operation of a vacuum pump (not shown), molten metal is poured into the mold cavity C from the sprue.
Even if the vacuum pump stops due to a power outage or other malfunction and the reduced pressure is released, or even if the vacuum pump is stopped after pouring and the reduced pressure of the mold 1 is released, the mating surfaces 2a at the front of the metal frame 2 will not meet. The front mating surface 2a of the metal frame 2 forming the metal frame 2, and the back mating surface 2b of the metal frame 2
The mold 1 is supported by the seals 3 and 4, and the sand S is attached to the metal frame 2.
It never spills out.

As is clear from the above explanation, according to the present invention, sand spillage can be prevented even if the vacuum pump stops due to a power outage or other failure, or even if the vacuum pressure in the mold is released after pouring. At the same time, it has the effect of preventing the accompanying dust generation and scattering of molten metal, and the effect of contributing to this type of industry is significant.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the present invention;
The figure is an A-A arrow view in Figure 1, and Figure 3 is B in Figure 1.
It is an enlarged view of the part. 1...Mold, 2...Metal frame, 2a, 2b...Matching surfaces, 3, 4...Seal.

Claims (1)

[Scope of utility model registration request] At least one of the mating surfaces at both ends of a frame body having a penetrating opening on the same line is provided with a structure that expands and contracts so as to enclose the lower part and both sides of the opening when the frame body is upright. In addition to embedding a highly flexible seal, the seal is set to have a dimension higher than both mold portions protruding from the surfaces of both frames when molds held under reduced pressure are combined with the two frames. A metal frame for vertical casting in vacuum molding.