JPS5829544A - Casting method - Google Patents

Abstract

PURPOSE:To prevent dislodging of a core print part from a core and to improve the workability during casting in the stage of releasing a top part and a bottom part after casting by forming a supporting part for supporting the core print part of the core beforehand by casting. CONSTITUTION:A core 4 having a core print part 3 is contained in a mold formed of a top part 1 and a bottom part 2, and plural pieces of grooves 5A are formed between the part 3 and the part 1 and are communicated with a space 5B. When molten metal is charged through a sprue 6, the molten metal flows into the space 5B which forms a cast product. Also, the molten metal flows into the grooves 5A, thus forming fins 7. If the top part 1 is moved upward after the casting, the core print part 3 is moved upward together with the top part 1 by the effect of the fins 7 connected to the cast product 8 and is removed from the bottom part 2. When an unloader 9 is inserted between the top part 1 and the bottom part 2 and the product 8 is pushed downward from the top part 1 by the same, the core print part 3 is dropped together with the product 8 by the fins 7 without dislodging from the core 4. The unloader 9 is transferred to the prescribed position, and the core 4 and the core print part 3 are collapsed and removed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a casting method in which a core having a baseboard portion is housed in a mold formed by an upper mold and a lower mold, and in particular, when the upper mold and the lower mold are released, The present invention relates to a casting method suitable for preventing child baseboards from falling off.

When using a material with relatively high residual strength after casting as core sand for casting, when the mold is released, the baseboard of the core remains connected to the core inserted into the casting. It is taken out. However, if the strength of the core is high, it will take time to collapse the core cast into the casting taken out from the mold, which will impair workability.

On the other hand, when core sand with excellent collapsibility is used, the baseboard part of the core falls off from the core during the process of removing the casting after the mold is released, and this fallen baseboard part is formed. Since the sand remains in the mold, it is extremely troublesome to remove this sand from the mold.

An object of the present invention is to prevent the baseboard part of the core from falling off during mold casting, and to improve workability during casting.
The objective is to provide a construction method.

The present invention provides a casting method in which a core having a baseboard portion is housed in a mold formed by an upper mold and a lower mold.
When the upper mold and the lower mold are released, a support member is formed on the baseboard portion to support the baseboard portion, and this support member is attached to the baseboard portion in advance. It may be provided or formed at the time of U'J construction.

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

In FIG. 1, upper mold 1 and lower IcI! A core 4 having a baseboard portion 3 is housed in the mold formed by the core 2 . A plurality of (three in the figure) grooves 5A are formed on the lower surface of the baseboard portion 3, which is in contact with the lower mold 2, and these grooves 5A are formed by the lower mold 2 and the core 4. It communicates with the space 5B (that is, the shape space of the casting).

A core 4 having a baseboard portion 3 in which such a groove 5A is formed
The second step is to store the metal in the mold, cast it, and take out the casting.
This will be explained using figures.

In Figure 2 (A), the baseboard part 3 is attached to the lower mold 2 from which the model has been removed.
A core having a shape is stored, and then placed on the upper mold 1 and lower mold 2 surfaces from which the model has been removed, and the upper mold and the lower mold are fixed to each other. Then, molten metal is injected from the sprue 6. This molten metal flows into the part (space) 5B that will become the cast product, and at the same time flows into the three grooves 5A formed in the baseboard part 3, forming a barrier.

Next, when the upper mold 1 and the lower mold 2 are separated by raising the upper mold 1 as shown in the second [21(B)], the effect of the barrier connected to the three baseboard parts 8 As the upper die 1 rises, the casting product 8 moves together with the cast product 8 and is taken out from the lower die 2.

Furthermore, as shown in FIG. 2(C), the unloader 9 is transferred between the upper mold 1 and the lower mold 2, and the cast product 8 is pushed downward from the upper mold 1 and falls onto the surface of the unloader 9.

At this time, since the baseboard portion 3 is supported by the barrier, it remains placed on the barrier without falling off the core. FIG. 3 is a cross-sectional perspective view of the main part of the cast product placed on the unloader 9. FIG. Then, after the nine unloaders are transferred to a predetermined position, the core 4 and baseboard portion 3 are collapsed, and the barrier is cut from the cast product 8.

Note that the number of grooves 5 may be 1 to 2 or 4 or more.
It can be selected arbitrarily from the viewpoint of preventing the barrier from falling off and the workability of cutting the barrier. Further, instead of providing a groove in the baseboard portion, a groove may be provided on the surface of the lower mold that contacts the lower surface of the baseboard portion to form a gap.

According to this embodiment, since the baseboard portion 3 does not separate from the core 4 during mold release, the sand constituting the baseboard portion 3 does not remain on the lower mold 2, and workability is improved.

FIG. 4 shows another example of the present invention, in which a core bar 10 extending into the core 4 is embedded in the baseboard portion 3. When a core 4 having such a baseboard portion 3 is cast by a process similar to the above embodiment, when the baseboard portion 3 is supported by the core metal 10, it falls off from the core 4 when the mold is released. Never. It should be noted that it is preferable that a large number of the core metals 10 be buried in the core 3 as in the case of grooves, and that they be buried in the baseboard 3 at a position close to the surface that contacts the lower die 2. This is desirable from the standpoint of supporting the baseboard portion 3.

As described above, according to the present invention, since the support member is formed on the baseboard part when demolding the VI type, it is possible to prevent the baseboard part from falling off from the core, and the work sex is improved.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the main part showing an example of the present invention, Figure 2 (A)
, (B), and (C') are explanatory diagrams showing the present invention in the order of steps, FIG. 3 is a cross-sectional perspective view of the main part of FIG. 2 (C), and FIG. 4 shows another example of the present invention. It is a sectional view of the main part. 1... Upper mold, 2... Lower mold, 3...
Core, 4...baseboard part, 5A...groove,
6... sprue, 7... Paris,
8... Casting product, 9... Unloader,
10... Core metal. Agent Tatsuyuki Unuma (and 2 others)

Claims (3)

[Claims] (1) In a casting method in which a core having a baseboard part is housed in a mold space formed by an upper mold and a lower mold, the core is supported by the baseboard part when the upper mold and the lower mold are released. 13 construction method characterized in that the supporting member is formed. (2) In claim 1, the support member is a groove-shaped space that communicates with the casting forming space between the baseboard and the lower mold when the core is housed in the mold. A VJ manufacturing method characterized by providing a space and forming a hole formed by molten metal injected into this space. (3) The side 1 construction method according to item 1, wherein the support member is embedded in advance in a baseboard of a core to be housed in a mold.