KR810001149B1 - Slush casting method - Google Patents

Abstract

By this invention on the slush casting method, we can efficiently produce the casting products having the good surfaces by simple operation, improve the heat efficiency, and save the cost of materials. Slush casting mold is composed of side parts(2) separated to right and left, or four directions sides, upper part(6) with sprue which molten metal is poured into the mold cavity through, and lower part(5) with the high permeability.

Description

Companion casting method

The accompanying drawings show an embodiment of the present invention.

1 is a plan view.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is an enlarged longitudinal sectional view of a lower combination type showing still another embodiment.

4 is an enlarged cross-sectional view of a lower combination type showing another embodiment (second embodiment).

The present invention relates to a method of companion casting, in particular new, made by the combination of simpler elements, by a simpler operation can efficiently produce a well-finished product, good thermal efficiency, The present invention relates to a catering method for reducing raw materials.

In the casting or molding of synthetic resins such as anti-horn and aluminum, in the casting method or molding, a mold in which a mold divided into right and left or four sides is combined is inclined at the time of injection of molten metal and then vertically It is known in the art to incline a mold again after raising it in the direction, to return the excess molten metal to melt | dissolution, to restore | restore a mold vertically, to separate a mold, and to obtain a casting.

In the catering method, in general, injecting molten metal into a mold, the work is performed under atmospheric pressure. As the process, (a) in a molten metal, the mold is first warmed to a temperature suitable for the molten metal temperature and then about 45 °. Start the pouring by inclining it, (B) At the end of pouring, make the mold vertical, (C) Inject the mold after pouring again to 90 ~ 130 ° to return the excess molten metal to the melting furnace, and then (D) Immediately or after a suitable time has elapsed to recover vertically, (e) the mold is separated to obtain a casting.

In the above step, cooling the pouring liquid by inclining the mold of paragraph (A) is to avoid air in the forming space portion being rolled into the forming space portion by the molten metal at the time of pouring, and actively evacuates the mold. If the exhaust in the space is not exhausted, the filling of the molten metal is poor. Therefore, the air remaining in the molding space expands by heating to generate pin holes in the structure of the casting, or the molten metal is formed in the molding space. Because it is not filled in the mold, it becomes a result of inverted molding with a cutout, which is a result of making a so-called defective product. In order to prevent these, as a gas extraction means, a fine void is usually provided in a suitable portion on the joining surface of the mold, or A plurality of thin plates provided with cutouts to be formed are laminated to form a molding space portion, and lamination thereof. Each provided with microscopic pores, and has its segeuk by performing gas extraction, or providing the inlet pocket (Pocket) attempt to facilitate the action of the exhaust at the time of the molten metal into the molding space through the unit.

However, the so-called craft castings made of antimony, aluminum, copper, gold, silver, etc. have almost irregular shapes such as fine figures and patterns on the casting surface in the placenta, and the castings of thin or long form or narrow middle part. There are many cases of castings having a narrow lifting part such as a lower half, such as a leg part, and as described above, microcavity for gas extraction is provided on the mating surface of the mold, or thin plates are laminated to provide microvoids for each of the laminated parts thereof. Since the mold of the back is inadequate, it is a divided mold without fine pores or the like formed in the wall of the molding space, and when pouring, the mold is inclined and then gradually restored vertically, or an inlet pocket is formed at the bottom of the molding space. The pouring is done.

However, depending on the cast product, the lowermost end of the above-mentioned space part may exist several places (for example, like an animal's foot), and it is very inefficient to form an inlet pocket at each lower lower end thereof.

Next, immediately after the pouring of the above-mentioned (b) and (c) ends, the mold is inclined again to return the excess capacity unnecessary for molding, and the molten metal is cooled and molded in the inner wall of the molding space. At this time, unnecessary molten metal is formed. Such excess molten metal is returned to the seaway through the exit of the hot water in the upper part of the mold when the mold is inclined.

If the secondary air is not supplied when the molten metal is returned, the molten metal remains in the molding space or becomes an uneven cast product and becomes unnecessary, which leads to waste of materials and further thermal efficiency. Falls out.

Thus, the secondary air required for the return of the molten metal is usually supplied from the gap at the exit of the bath of the hot water. However, when the upper part of the cast product has a narrow narrow shape such as a vase or a wine bottle, It is difficult to spread from the hot water due to a sudden inclination and the like, and the return of the molten metal is difficult to be performed completely. Therefore, there is a proposal to utilize secondary air by forming an inlet pocket at the lower end of the molding space. However, in this method, the secondary air is excessively supplied or it is necessary to form a split mold with an inlet pocket. In addition to the increase in size, in the case where the lowermost part of the space part is necessary (for example, when molding an animal), the joining and disassembly of the molds are not easy, and the extra molding of the formed part of the mold is not easy. After the separation, removal was added to avoid the decision to significantly reduce productivity.

Therefore, the present inventors have a function of exhausting a small amount of air (mostly exhausted in the direction of the water flow by inclining the mold) which can be press-sealed by the molten metal at the bottom end of the molding space in the pouring. In case of insufficient supply from the water flow direction at the time of returning, the supply of secondary air is sufficient from the bottom end of the molding space, the mold is downsized, the molds are combined, and the mold separation is simplified. It has succeeded in providing a companion casting method that facilitates finishing work after mold separation, and also obtains a casting having a good casting surface.

Accordingly, a feature of the present invention is to provide a companion casting method which is excellent for supplying secondary air, which is particularly necessary for the return of molten metal. The present invention provides a method of casting with a large number of shots and a good thermal efficiency, and another feature of the present invention is to provide a method of casting with a good casting surface, and to simplify the finishing work after mold separation. .

In addition, it is to provide a casting method that can be adsorbed odor and harmful gases that occur in the case of the combination of the cell mode sand type, even in the sanitary and pollution prevention facilities.

BRIEF DESCRIPTION OF DRAWINGS To make these and other objects and features of the present invention more apparent, reference will now be made in detail to the accompanying drawings.

In the accompanying drawings, the frame structure (left or right supported by the frame 1 or the two lateral dividing types 2 and 2 is formed of a porous material supported by the bottom plate 4 which is open to the atmosphere by drilling the ventilation holes 3 in the lower bottom when joined in the longitudinal direction. The mold is constituted by bonding a lower combination type 5 in which a suitable heat-resistant release agent is laminated to the cell mode sand, for example, and a combination of the upper combination type 6 with a water flow from the upper portion.

It is preferable to use the cell mode sand mold | type used for the said lower combination type | mold practically using the material which mixed the phenol resin with the silica sand of 80-100 mesh of particle size, carrying out desired shaping | molding, and solidifying. At this time, the lower end of the cell mode sand type is cut into a lower combination type (FIG. 3) in which the cavity 9 is formed, and the ventilation is increased or the zeolite (natural acid zeolite group ( Or a synthetic zeolite). A fine powder composed of a porous and adsorbent material having a particle size of 70 to 100 mesh may be filled and solidified to form a core material 10 (figure 4).

[First Embodiment]

After molding using a silica sand with a particle size of 80 mesh and using a mold combined with a lower solidified form that is sufficiently solidified, the temperature of the mold during pouring is 180 ° C, and the alloy of alloying alloys (content rate, antimony 15-20%, lead 80 ~) 85%) The molten metal temperature is 300 ° C, the inclination angle of the mold is about 45 °, and the mold is poured into a bottle shape (approximately in the form of an attached drawing) having a height of 30 cm, a maximum cross section diameter of 7 cm, and a minimum cross section diameter of 3.5 cm. After casting for 7 seconds, the mold was raised vertically, and the mold was gradually inclined to return the excess molten metal to the melting furnace, and then restored vertically. The casting surface of the casting was good, and a good product without a pin hole was obtained. Moreover, when this was cut in the longitudinal direction and the thickness was examined, it was not found where the thickness was almost on average.

Second Embodiment

The lower cavity type used in the above-described first embodiment was filled with a core 10, which was formed by solid adhesive with a suitable adhesive to a raw material having a particle size of 70 mesh of a natural zeolite, by joining the distal end portion thereof. In the case of the first embodiment, the mold was combined with the side-divided mold in the case of the first embodiment using a lower combination type, a mold temperature of 250 ° C and an aluminum molten metal temperature of 720 ° C. And after the molten metal was examined and the product was examined after the mold separation, the product superior in casting surface and thickness of the casting was obtained as compared with the product by the conventional method.

In particular, since the zeolite material is used as the core 10, the odor or toxic gas generated by heating the phenol resin used for the solidification of the cell mode sand is adsorbed to the zeolite, which is the core, and thus, the odor is reduced and thus harmful gas is also adsorbed. It was found that miniaturization of the odor generated and the toxic gas control facility became possible.

Third Embodiment

A compressed air pump provided with an appropriate connection part 7 on the outside of the vent hole 3 drilled on the bottom plate 4 of the lower combination type used in the first embodiment, and a micro switch for operation control connected to the air supply pipe 8 at this connection part 7. In order to supply secondary air through the microcavity of the combination 5 below in order to operate the air pump in response to the molten metal in connection with the molten metal. The pouring of the molten metal and the molten metal were carried out in accordance with the tips of the examples. At this time, 1.02 atu of unpressurized secondary air was supplied by air pump for 3 seconds, and the product was examined after mold separation. Good castings can be obtained.

Since the invention of the present invention is of the above-described configuration, the secondary air required for the return of the molten metal is well supplied to obtain a good product. Next, a connection part is added to the mold for an introduction pocket for secondary air supply. No need to install, the mold can be miniaturized, the mold joining, mold separation and finishing after the mold separation is simplified, saving effort, thermal efficiency is good, and the number of shots can be increased, it is economical, Furthermore, by filling the core part 10 made of zeolite material in the cavity 9 at the end of the cell-mode sand type, it is possible to adsorb odors and harmful gases, thereby reducing the sanitary and pollution control facilities. .

Claims (1)

The upper portion of the molding space formed by joining the side divided molds 2 coupled to the left and right or the four sides has an upper combination type 6 having a water turbulence, and is formed by combining the lower combination type 5 to the bottom of the molding space portion. In the method of casting method, the lower combination type (5) is configured to be provided with fine air gaps, and the outside of the lower end of the lower combination type (5) is opened in the air, whereby the fine pores are used during the pouring of the molten metal and the molten metal. Companion method casting method characterized in that the necessary exhaust and in particular through the supply of the secondary air made easy through.

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