JPH01210165A - Cast-in method - Google Patents

Abstract

PURPOSE:To improve strength and castability of a product by coat-forming a fitted assembling body with a material to be cast in and a pattern by a molding material and pouring molten metal into formed space part after removing the pattern from the molding material. CONSTITUTION:The material to be cast in having complicate shape of blade 10, etc., is manufactured with independent to a main body of hub 12, etc., to attach excess thickness for casting 10A. The blades 10 are fitted into slits 14A in the pattern 14 of rubber-made, etc., having the same shape as the hub 12, to form the assembling body. Successively, by coat-forming and molding the assembling body with gypsum, etc., the gypsum mold 16 is formed and also cavity 18 remaining the blades 10 is formed. Further, molten metal for forming material of the hub 12 is poured into the cavity 18 to obtain the product 20, in which the blades 10 is cast in. As the material to be cast in is preformed with the high strength material, the strength of the product 20 is improved and as the part having complicate shape and insufficient flowing is cast in, the castability is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to engine superchargers and turbine type engines.
``This article relates to a casting method that allows complex-shaped parts that require high strength, such as pro-ain impellers for L/tubers, to be manufactured at low cost.

[Conventional technology]

Traditionally, when manufacturing parts that require high strength and have complex shapes, such as pro-ain impellers, the monolithic casting method has been adopted. As stated in 1069,
They were manufactured using molds such as wax molds, plaster molds, and ceramic molds.

[Problem to be solved by the invention]

However, with the conventional monolithic casting method described above, although the material of the product is uniform and the mechanical strength is uniform, parts with complex shapes such as pro-air impellers cannot be manufactured from aluminum alloy, which has good castability. Therefore, normally only products with a tensile strength of up to about 35 kgf/c- could be manufactured. For this reason, it was difficult to say that it could sufficiently withstand high temperatures and high rotations from the viewpoint of fatigue strength. In particular, the pro-air impeller is an important component that determines engine efficiency, output, and characteristics, so it is used under harsh conditions, and there is a demand for higher rotation speeds, lighter weight, and higher intake air temperatures. , it was necessary to establish a manufacturing method for pro-ain impellers using high-strength materials.

The present invention has focused on the above-mentioned conventional problems, and an object of the present invention is to provide a casting method that has high strength and can easily manufacture even a complex impeller shape.

[Means to solve the problem]

In order to achieve the above object, the casting method according to the present invention involves fitting a material to be cast into a fitting part formed on a model having the same shape as the material to be cast, and connecting the model and the material to be cast. The assembly was covered with molding material and solidified, and cast material was poured into the space created by removing the model from the molding material for casting.

[Effect]

According to the above configuration, instead of integrally casting a complex-shaped part, the complex-shaped part is divided into a plurality of parts at easy-to-divide points, and the cast material of the divided parts is made into a model of the same shape. Replace it.

Then, a separately manufactured cast material is fitted into a fitting part provided on the model and integrated to form an assembly, and the outer surface of this assembly is hardened with liquid molding material to form a mold. Form. At this time, the mold material solidifies the cast material integrally. Next, when only the model is removed from the mold, leaving the casting material fixed in the mold material inside, a space with the same shape as the casting material will be created, and this will be used as a mold to pour the casting material into. By doing so, a cast product is manufactured in which the cast material exposed in the space is cast.

〔Example〕

Embodiments of the casting method according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory diagram of the manufacturing process of a pro-air impeller according to an embodiment. In manufacturing the pro-ain impeller, in this embodiment, the blades 10, which are the constituent members of the pro-ain impeller, are first manufactured independently of the hub 12. This blade 10 is formed by stamping an aluminum alloy plate using a press (Fig. 1 (1)).
0 is provided with a casting allowance 10A for the hub 12.

On the other hand, a rubber model 14 having the same shape as the hub 12 is manufactured (FIG. 1 (2)). A slit 14A is formed in this rubber model 14 for inserting the casting allowance 10A of the blade 10. When molding the hub 12, the blades 1O are first inserted into the rubber model 14 to form a pro-impeller assembly (FIG. 1 (3)). Next, a mold of the hub 12 is made. This molding is done by turning the model in the opposite direction, making a mold of the same shape as the assembly using plaster (Fig. 1 (3)), and removing only the rubber-shaped model 14 of the hub 12, leaving the blades 10. (Fig. 1 (4)). As described above, the blade 10 remains in such a plaster mold 16, and the cavity 18 of the hub 12 is formed in the hollow part from which the rubber model 14 has been removed. 10A has come.

In this way, the hub 1 is placed against the plaster mold 16 in which the blades 10 are left.
The molten aluminum, which is the molding material in step 2, is poured into cavity 1.
8 by gravity casting or pressure casting, and form the blade 1.
The part corresponding to the hub 12 is solidified in the state in which the 0 is cast, thereby obtaining a pro-air impeller 20 as a final product as shown in FIG. 1 (5). In this case, feathers! Although aluminum is used as the material of the hub 110, it is of course possible to use fiber-reinforced aluminum, steel, or the like if casting is possible in relation to the material of the hub 12.

In this way, in this embodiment, the feathers 110 are attached to the hap 1 one by one.
Since it is manufactured in advance separately from 2, various materials can be selected as the material for the blade IO. Then, a rubber model 14 of the hub 12 including the blade 10 is created, and a plaster mold 16 is taken using this rubber model 14 to form the cavity 18 of the hub 12, and the blade 10 is cast at the same time. Therefore, the hub 12 can also be made of any material. Moreover, since the blades 10 are manufactured independently, even if the shape of the pro-ain impeller is complicated, there is no need to consider the hot water supply to the blade IO, which is a problem in the case of integral casting, so it can be manufactured easily.

In the above embodiment, the rubber-shaped model 14 was used, but if the blade 10 has a simple shape such as a flat plate, the rubber-shaped model 14 can be used by forming a slit in which the blade 10 is inserted directly into the plaster mold 16. You'll be better off without it.

Next, FIG. 2 shows a casting method according to a second embodiment. In this case, first, a predetermined number of blades f110 are made by press-punching an aluminum material into a predetermined shape ((1) in the same figure), and a low-type model 22 ((1) in the same figure) is made by forming the blades 10 into the same shape as the hub 12 of the impeller. 2)) Feather [1
Insert the casting allowance 10A portion of 0 to form an assembly. Next, after coating the assembly of the wax model 22 and the blade 10 with a refractory material ((3) in the same figure), the refractory material is removed by turning it upside down and heating it ((4) in the same figure). Inside, the blade 10 is held fixed to the refractory mold, and a cavity 28 is formed in which the casting allowance 10A of the blade 10 and the low model 22 is protruded ((3) in the same figure).
. Then, by pouring molten aluminum into this cavity, the hub 12 with the blades 10 cast therein is cast.

In this embodiment, as in the first embodiment, the material of the vane IO may be fiber-reinforced aluminum, cast steel, or plastic, as long as it can be cast in relation to the material of the hub 12.

In any of the embodiments described above, it goes without saying that if the hub 12 is cast by pressure casting, a product of higher quality can be manufactured than by gravity casting.

〔Effect of the invention〕

As explained above, according to the present invention, the cast material and the cast material are made of different materials, so even if there is a part with a complex shape that is subject to dimensional restrictions, the part can be made into a high-strength material, and high-strength products with excellent storage temperature resistance can be cast. In addition, even for parts with complex shapes, it is possible to improve castability by separately molding the parts that have poor liquid flow and then casting the parts that need to be replaced. This eliminates the limitation of using aluminum alloys, which have good properties, and allows the use of iron-based materials, which also makes it possible to manufacture high-strength products with high temperature resistance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the steps of the casting method according to the first embodiment, and FIG. 2 is an explanatory diagram showing the steps of the casting method according to the second embodiment. 10...Blade, 12...Hub, 14.
Old... Rubber model, 16... Plaster mold, 18...
...Cavity, 20... Pro-ain impeller. Agent Patent Attorney Oka 1) Kazuki

Claims (1)

[Claims] (1) A material to be cast is fitted into a fitting part formed on a model having the same shape as the material to be cast, and the assembly of the model and material to be cast is covered with molding material and solidified. A casting method characterized in that casting is performed by pouring casting material into a space created by removing the model from the mold material.