JPH10291066A - Method for shaking out mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method, by which core sand in a mold is not mixed into a green molding sand, at the time of executing the shaking-out of the mold. SOLUTION: Molten iron 7 is poured into a cavity 3 so that the molten iron 7 reaches only to near the bottom part of a molten metal pool part 6 formed at a pouring box 5 or an upper mold 1. After the poured molten metal 7 solidifies, the pouring box 5 and the upper mold 1 or the upper mold 1 are relatively risen under condition of remaining the casting 8 on a lower mold 2, and separated from the lower mold 2 and thereafter, the casting 8 is separated from the lower mold 2. By this method, a core piece 9 is separated from the lower mold together with the casting 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a mold separating method for separating a hanging dam, an upper mold, a casting, and the like from a lower mold after pouring into a cavity formed by upper and lower molds made of a green mold. .

[0002]

2. Description of the Related Art In general, when a casting is manufactured using a green mold and a core, the recovered sand collected after separating the mold is subjected to a required treatment, regenerated as casting sand, and used for mold molding. It has become.

[0003]

By the way, the recovered sand contains a large amount of core pieces generated by the collapse of the core, in addition to the green pieces generated by the collapse of the green mold. In addition, among the recovered sand, the sand produced by the collapse of the raw mold contains a large amount of clay necessary for foundry sand, but the sand produced by the collapse of the core contains this clay. Not. Therefore, when reclaiming and manufacturing sand for green molding from the recovered sand, it is desirable that the recovered sand does not contain core sand. There was a problem of mixing in. Therefore, in recent years, there has been a strong demand from the casting industry for the emergence of a mold separating method in which the core sand in the casting does not mix with the green mold sand when the mold is separated. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for separating a mold in which core sand in a casting is not mixed with green sand when the mold is separated. It is in.

[0004]

Means for Solving the Problems To achieve the above object, a method for separating a mold according to the first aspect of the present invention provides a method for separating a mold into a cavity formed by a green upper mold and a lower mold. Mold, or, or upper mold, and a casting, a method for separating from the lower mold, so that the molten metal only reaches near the bottom of the hanging weir or the bottom of the pool formed in the upper mold. Injecting the molten metal into the cavity, after the injected molten metal is solidified, leaving the casting on the lower mold, the hanging dam and the upper mold, or the upper mold is relatively raised and separated from the lower mold, Thereafter, the casting is separated from the lower mold, and the core piece is removed together with the casting, so that the core piece is not mixed into the green sand. In addition, the method of separating the mold according to the invention of claim 2 is characterized in that after pouring into the cavity formed by the upper and lower molds made of the green mold, the hanging dam and the upper mold, or the upper mold and the casting are replaced with the lower mold. A method for separating the molten metal into the cavity so that the molten metal only reaches the vicinity of the bottom of the hanging weir or the bottom of the pool formed in the upper mold, and the injected molten metal is solidified. After that, the casting is left on the lower mold and the hanging dam and the upper mold, or the upper mold is relatively raised and separated from the lower mold, and further, the casting is separated from the lower mold and then collapsed. The core sand is removed from above the lower mold so that core pieces do not mix into the green sand.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. Cavity 3 and runner 4 formed by upper and lower molds 1 and 2 made of a green mold, and hanging dam 5
The molten metal 7 is injected from the hanging dam 5 into the inside of the runner 5a so that the molten metal reaches only near the bottom of the pool 6 formed in the hanging dam 5 on the upper mold 1. The length of the runner 4 in the vertical direction is appropriately determined depending on the shape of the casting 8 and the like. After the poured molten metal 7 solidifies, as shown in FIG. 2, the hanging dam 5 and the upper mold 1 are raised or the lower mold 2 is lowered, and the casting 8 including the runners 4 and 5a is left in the lower mold 2. The hanging dam 5 and the upper mold 1 are separated from the lower mold 2. Since the molten metal 7 has reached only near the bottom of the pool 6 of the hanging weir 5, when the upper mold 1 is raised, the upper mold 1
hardly get caught on a (solidified)
Moreover, the runners 4.5 in the hanging weir 5 and the upper mold 1 are used.
a, a condensed layer in a state easily collapsed by the heat of the molten metal is formed around the casting 8 or the like. Therefore, hanging dam 5
When the upper mold 1 is separated from the lower mold 2, the upper mold 1 hardly collapses, and only the condensed layer collapses and is separated.

When the casting 8 including the runners 4 and 5a is separated from the lower mold 2 and moved to an appropriate place, the casting 8
The core piece 9 can be almost completely removed from the lower mold 2 via. Thereafter, the core piece 9 is disintegrated and removed from the casting 8 by appropriate conventional means, and core molding sand can be produced from the removed core piece 9 by a conventional core sand recycling device. As a result, the core piece 9 can be removed without being mixed into the green mold.

In the above embodiment, the hanging dam 5 is provided separately. However, as shown in FIG. 3, the same effect can be obtained by integrating the hanging dam 5 and the upper mold 1 into the upper mold 21. can get. Further, the core pieces 9 of Examples 1 and 2 have the property of remaining in the casting 8 without being collapsed. However, as shown in FIG. When the upper mold 31 is separated from the lower mold 32, or when the casting 28 is separated from the lower mold 32,
When the core piece 29 is removed from the lower mold 32,
Fall on. Therefore, in this case, the collapsed core sand on the lower mold 32 may be dropped onto a conventional recovery device by inverting the lower mold 32 by appropriate conventional means. Further, the casting on the lower mold 32 may be removed by inverting the lower mold 32 by appropriate conventional means.

[0008]

As is apparent from the above description, claim 1
The invention is directed to injecting the molten metal into the cavity so that the molten metal only reaches the bottom of the hanging weir or the pool formed in the upper mold, and after the injected molten metal is solidified, the casting is left on the lower mold. The hanging dam and the upper mold, or the upper mold was raised relatively to separate it from the lower mold, and then the casting was separated from the lower mold. The core pieces are hardly mixed into the green sand because they are removed together. The invention according to claim 2 is characterized in that the molten metal is injected into the cavity so that the molten metal only reaches the vicinity of the bottom of the hanging dam or the pool formed in the upper mold, and after the injected molten metal is solidified, the casting is cast. Leaving on the lower mold and the upper mold, or the upper mold is relatively raised and separated from the lower mold, further, the casting is separated from the lower mold, and then the collapsed core sand is removed from the lower mold. Because the core pieces contained in the casting collapse and fall on the lower mold, the core sand on the lower mold is removed separately, so the core sand is removed. Has an excellent effect that it is not mixed into the green sand.

[Brief description of the drawings]

FIG. 1 is a schematic front view for explaining a first embodiment of the present invention.

FIG. 2 is a schematic front view for explaining a first embodiment of the present invention, showing a state in which an upper mold is separated from a lower mold.

FIG. 3 is a schematic front view for explaining a second embodiment of the present invention.

FIG. 4 is a schematic front view for explaining a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 upper mold 2 lower mold 3 cavity 5 hanging weir 6 pool 7 molten metal 8 casting

Claims (3)

[Claims] 1. A method for separating a hanging dam and an upper mold or an upper mold and a casting from a lower mold after pouring into a cavity formed by an upper mold and a lower mold made of a green mold. The molten metal is poured into the cavity so that the molten metal only reaches the bottom of the hanging weir or the pool formed in the upper mold, and after the injected molten metal is solidified, the casting is placed on the lower mold. Wherein the hanging dam and the upper mold or the upper mold is relatively raised to separate from the lower mold, and then the casting is separated from the lower mold. 2. A method for separating a hanging dam and an upper mold, or an upper mold, and a casting from a lower mold after pouring into a cavity formed by an upper mold and a lower mold made of a green mold. The molten metal is poured into the cavity so that the molten metal only reaches the bottom of the hanging weir or the pool formed in the upper mold, and after the injected molten metal is solidified, the casting is placed on the lower mold. Leaving the hanging dam and the upper mold, or the upper mold is relatively raised and separated from the lower mold, further, the casting is separated from the lower mold, and then the collapsed core sand is removed from the lower mold. A method for separating a mold, comprising removing the mold. 3. A method for separating a hanging dam and an upper mold, or an upper mold and a casting from a lower mold after pouring into a cavity formed by an upper mold and a lower mold made of a green mold. The molten metal is poured into the cavity so that the molten metal only reaches the bottom of the hanging weir or the pool formed in the upper mold, and after the injected molten metal is solidified, the casting is placed on the lower mold. The mold and the upper mold, or the upper mold is relatively raised and separated from the lower mold, and then the collapsed core sand and the casting are removed from the lower mold. Disassembly method.