JPS58188557A - Metallic casting - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to metal castings, particularly (but not necessarily limited to) gold II, which has a high shrinkage rate. (Iron 1.
(such as copper, aluminum or aluminum bronze).

Difficulties arise when such metals are used to cast articles of constant or substantially constant thickness and large surface area, or articles having a single similarly shaped part. Ru.

In such cases, during cooling and solidification, the rather rapid cooling of the molten metal and the consequent shrinkage result in an incomplete casting, and in the worst case, discontinuities in its internal structure. 8 Various methods have been used in the past to overcome this problem. For example, a section with a sloped cross-section can replace a section of large area and constant thickness, so that the interior of the thinnest section can be absorbed by the thickest section (by means of an appropriate hot water supply) before the thickest section itself solidifies. It is known to use means of modifying the design so that it is "filled" with molten metal from the molten metal. Alternatively, castings temporarily add metal to vulnerable areas. Such adducts are called "nonirad".

However, both of these solutions are difficult to solve even if the latter
Even if the weight increases and the "padded" is later removed,
The overall cost of a casting is, of course, increased not only by the provision of additional metal, but also by the cost of removal operations, which increases the cost of the casting.

Another way to avoid the above problems arising from metal shrinkage is to
It is not necessary to heat the exothermic or heat insulating material or to use cooling means. Of course, it is possible to use a very large number of hot water supply heads. However, such devices are complicated by the impracticability of creating an effective solidification end area between the hot water heads. All of the above methods are laborious and disadvantageous.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an improved metal casting which allows for easy and economical casting of metals which have a high shrinkage rate but nevertheless do not deviate from the above considerations.

According to the invention, there is provided a metal casting having at least a portion having a large surface area relative to its thickness;
In this case, the outer IIIf1 surface or the inner surface or both of these surfaces of said part may have a plurality of surfaces in which the thickness of the casting locally differs (i.e. decreases and/or increases) from the thickness of adjacent parts of the casting. It has a separate location.

When forming a casting as defined in the previous paragraph, and when spaced recesses are used on one or both surfaces of the casting, a plurality of hot water heads are provided between such recesses in one recessed area. Additionally, the recessed portions are located on the outside and inside of the casting.
When formed on both surfaces (different surfaces than those formed on only one such surface), the recesses on the outer surface are unidirectionally aligned or offset with the recesses on the inner surface. It is preferable that these recesses have a planar shape, generally have a circular or non-circular shape, and have a depth that gradually increases from their periphery.

Alternatively or additionally, at least a portion of the outer surface area of the casting, or the inner surface thereof, or both of this surface area has a plurality of spaced apart monolithic protrusions. In these cases,
Preferably, one hot water supply head is provided for each said projection.

The present invention will be explained below with reference to the accompanying drawings.

In the figure, a partial view of the illustrated casting is made, for example, vI4-'11', although other materials with relatively high shrinkage rates may be used to form the casting according to the present invention. FIG. 811 is a plan view of a casting 10 having a plurality of recesses or indentations 11 formed on its outer surface. The recesses are generally circular in shape as shown, but they can be planar and non-circular if desired. Furthermore, as seen in the cross-section of FIG. 2, the recesses 11 formed on the outer surface of the casting are abutted by similar recesses 12 formed on the inner surface of the casting, such that the outer and inner recesses Although the parts are directly aligned with each other, alternative embodiments (not shown)
, the inner and outer recesses are offset by K from each other. Obviously, as shown in FIGS. 1 and 2, the casting 1
The mold tool (not shown) used to form the 0 is such that the protrusions corresponding to the recesses 11 and 12 are formed with recesses. In addition to multiple inlets, the main inlet for the bath metallizing zone in the mold is 1 in Figures 1 and M2.
A plurality of hot water supply heads as shown in the outline of the 6-point machine I#A″r% are provided, and such a hot water supply spatula P communicates with the thickest part of the casting product or with the part of the casting product that has a recessed part. It is disposed between the recesses 11 and 12 in order to store the information.

FIG. 6 shows another embodiment, in which the cast product 14 is
111. In another embodiment shown in FIG. 4, the cast product 15 has a recess 8 only on its inner surface.
It has 12. However, as we will see in all cases, each depression increases in depth from its periphery inwardly, so that when molten metal is poured into the prepared mold, The heat content of solidifying metal increases exponentially from the thinnest part of the casting to its thickest part. The recesses are balanced and spaced to ensure proper directional assimilation from the center of the recess back to the hot water supply head 13, depending on the size and number of hot water heads 13, of course.
and the depth of the recess will vary in relation to the size and thickness of the part being cast and the metal used in the casting. Furthermore, it is also possible to provide the above-mentioned recesses in the entire gun relic or part of it.

A further device is shown in FIGS. 5 and 6. In the structure shown in FIG. 5, the cast product 1o is 9411
Such projections (as shown) having a plurality of ridges or silk-like ridges 16 over at least a portion of the light surface area and formed on one side of the casting It is aligned with the protrusion on the other side of the item. Each pair of alignment protrusions 1
6 are supplied by individual hot water heads 17, and the mold tooling (not shown) used to form the casting 10 is suitably shaped to provide such protrusions 816.

In another embodiment shown in FIG. 6, the protrusions 16 are formed only on the outside of the structure, but individual hot water heads 17 for the protrusions are provided as in the previous example.

These protrusions have a generally convex configuration as shown, and they are used over the total area of the casting required to accommodate, for example, a pressure body or receiving an injection beam.

41! formed as described above! lj number of protrusions are actually used in combination with a plurality of recesses as shown in the previously described structures shown in Figures WC1 to 4, and one advantage of using such a combined structure is that Special areas with highly stressed recesses or depressions can be strengthened by replacing them with recessed arrowheads. When such a combination of recesses and protrusions is used, a larger number of hot water heads is required than when only recesses or only protrusions are used.

Furthermore, in the case of a cast product having only a concave portion, one hot water supply head is used for multiple concave portions. Each such protrusion has its own hot water supply head as described above.

Castings formed according to the invention have, among other things, the following advantages.

■It can be manufactured as a relatively lightweight cast product with great strength.

2. Cast products of extremely high quality can be obtained.

3. There is no need for a slanted part or a "set abutment" part to be removed by expensive machining or heat treatment.

4. No need for cooling or expensive heat-generating "lid pad" ↑
be.

5. Melting costs can be reduced because cast products are comparatively lighter than 1.

6. Since it contains relatively light metal parts, the cost of post-treatment heat treatment can be reduced. −? The hot water supply head can be made compact and can be easily removed.

8. Since the recesses and/or protrusions are formed from protrusions and/or recesses made in the mold tooling in which the casting is made, the shape adjustment and thus M? The hardening in the direction of contact is easily applied and ensured.

9. This invention conventionally requires assembly or large, iL
Bamboo is commonly used for large structural containment casings made as gate castings.

[Brief explanation of the drawing]

Fig. 1 shows a partial ten-sided section 1 of an embodiment of a cast product formed according to the present invention, and Fig. 2 shows -2- of Fig. 1.
FIGS. 6 and 4 are partial cross-sectional views taken along section 2 of section 1 of another embodiment of class 2s of a casting according to the invention.
11iiiI side views, FIGS. 5 and 6 show parts of two further embodiments of castings according to the invention. It is a Jr side view. 1 Codes in the diagram: 10... is a manufactured product, 11... recessed part, 1
2... Concave portion, 1... Hot water supply head, 14... Casting product, 15... Casting product, 16... Protruding portion, 17...
Indicates the ship's age head. FtG, 5 1v FtG6゜

Claims (1)

Claims: 1) A metal casting having at least a portion having a surface area of large area relative to its thickness, wherein such surfaces of the outer surface or the inner surface of said portion, or both: The thickness of the casting differs locally from the thickness of adjacent parts of the casting (
Metal castings having a plurality of spaced apart sections (i.e. reduced and/or enlarged). 2) The plurality of spaced apart portions are formed on both the outer and inner g4 surfaces of the casting, and portions of the outer surface are directly aligned with portions of the inner surface. metal castings. -6) The plurality of spaced apart portions are formed on both the outer and inner surfaces of the casting, and the portions on the outer surface are staggered with the portions on the inner surface. The metal casting product described in item 1. 4) A metal casting article according to any one of the preceding claims, wherein each of said plurality of spaced apart portions has a generally circular planar shape. 5) The metal casting product according to claim 1, wherein the depth or thickness of each of the spaced portions is greater than the periphery thereof.