JPH05185181A - Sand mold assembly integrally connected and joined by adhesive and adhesive method thereof - Google Patents

Abstract

PURPOSE:To facilitate the adhesion of cores with a high-viscosity adhesive by providing through-holes for injecting the adhesive penetrating straight a sand mold group. CONSTITUTION:The through-holes 2 are so provided as to be array straight when the plural sand molds 1 are assembled. The through-holes 2 are formed to a circular truncated cone shape (or pyramidal shape) and are provided with inclination angles on the inside walls. Adhesive injection cavities 3 may be provided on the end faces in the side to be joined to the cores to which the through-holes are adjacent, the deviation and displacement of the core groups are prevented by the irregularity of the diameters or sections of the through- holes 2 after the sand molds 1 are solidified by the adhesive to each other. The flow property of the adhesive is not hindered and the molding is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand mold assembly integrally connected and adhered with an adhesive and a method for connecting and adhering these sand mold assemblies.

[0002]

2. Description of the Related Art Conventionally, a combination of cores, a combination of a core and a main mold, and as a fixing means, bolts are passed through the through holes of these molds and tightened with nuts, or the mating surfaces of the molds are joined together. Means for applying an adhesive, connecting and adhering, and providing a groove for the adhesive on the adhering surface are also used. As a concrete example, a "core assembly device" as described in Japanese Utility Model Laid-Open No. 64-5736, or an adhesive supply hole communicating with a mold assembly and a groove provided on a joint surface, etc. Means for filling, connecting, and adhering an adhesive (Japanese Patent Application Laid-Open No. 3-18457)
No. gazette) is known.

[0003]

When the cores are set in the main mold without being fixed and the molten metal is poured, a displacement between the cores occurs due to the pressure of the molten metal, resulting in a defective casting shape and so-called misalignment. .
Further, since the hot water pressure has a great influence on the central portion of the core which is combined without being fixed, a gap is generated between the cores, so that the shape of the casting is defective and so-called flash is generated.

In the case of bonding with an adhesive, for example, FIGS.
As shown in FIG. 2, it is necessary to provide an adhesive coating groove, and it takes time and labor to apply the adhesive, and the adhesive may stick out to cause a casting defect.

Also in the technique described in the above-mentioned Japanese Patent Laid-Open No. 3-18457, since the adhesive groove exists, the adhesive must pass through the flat portion at several places to reach the final end. In other words, it takes a long time to reach it. Further, as an adhesive, it is usually solid at room temperature and is heated and refilled with a liquid. It becomes solid again when left standing after filling, but when liquid, it is 1
It has a large viscosity of about 1000 to 2000 CP at 80 ° C. Therefore, it becomes very difficult for a high-viscosity adhesive to pass through the adhesive groove, accompanied by a temperature decrease.

[0006]

The inventors of the present invention succeeded in developing the present invention as a result of various studies and experiments for solving the above-mentioned problems, and the technical constitution of the present invention. As described in each of the claims, a sand mold such as a main mold and / or a core is provided with at least one through hole for injecting an adhesive that linearly penetrates the sand mold group. In a method of combining a sand mold assembly and a sand mold such as a main mold and / or a core, which are integrally connected and adhered by an adhesive with a predetermined shape, and integrally connected and adhered by an adhesive, At least one through-hole for inflow of an adhesive is provided in each of the sand molds, these through-holes are linearly connected and arranged, and the adhesive is injected into these through-holes and solidified. There is a method of connecting and adhering multiple sand molds. With technical configuration, faster completion of injection of the adhesive, not occur a change in size of the mold and / or core group assembly, machining of grooves for adhesive becomes unnecessary,
Therefore, various effects such as reduction of die manufacturing cost can be exhibited.

Specific examples of the present invention will be described in detail with reference to the accompanying drawings.

Each of the examples of the attached drawings is an assembly drawing of a crankcase core of an automobile engine, and FIGS.
FIG. 3 is a plan view and a vertical sectional view of a core assembly for a vehicle type, and FIGS. 3 and 4 are plan views and vertical sectional views of the core assembly for a vehicle type.

In the examples of FIGS. 1 to 4, through holes 2 for injecting an adhesive which linearly penetrate are provided or bored at predetermined positions of the core 1, and these through holes are formed as shown in FIG. When assembled, the cores 1 are arranged so as to be linearly arranged. The through holes 2 are frusto-conical (or pyramidal) in shape as shown in FIG. Alternatively, it is possible to prevent the core group from being displaced or displaced by causing the cross sections to be different.

FIGS. 5 and 6 are plan views and longitudinal sectional views respectively for two vehicle models and FIGS. 7 and 8 are for one vehicle model. The adhesive injection through holes 2 in this example are through holes of each core. An adhesive injection cavity 3 is provided on the end face on the side of joining with the adjacent core of the. In these examples, the inner wall of the through hole may not be provided with an inclination angle and may be cylindrical as illustrated.

It is needless to say that the through holes for injecting the adhesive into a core or the like having a hollow portion are arranged at positions avoiding these hollow portions.

The above-mentioned through hole and cavity for injecting the adhesive may be simultaneously molded at the time of molding the mold (including the core), and may be easily formed by machining or the like after molding the mold.

In the present invention, the mold and / or core group having the above-described shape is integrally assembled (or incorporated) into the required shape, and liquid bonding is performed from one end opening of the through hole for adhesive injection that linearly communicates. By injecting and solidifying the agent, it can be used for casting as a predetermined assembly.

By virtue of the technical construction of the present invention, the injection through hole and the cavity are always communicated with each other in a linear shape (or a rod shape), so that an adhesive having a relatively high viscosity can be easily injected and filled. Moreover, when the adhesive solidifies, its shape becomes a taper and a bar with steps, so that the mold and core group are firmly held, and the assembly mold and core group are displaced (shifted) from each other. Therefore, it is possible to withstand the hydraulic pressure due to the handling of the assembly and the casting of the molten metal, and to prevent the finished casting from becoming defective.

[0015]

【The invention's effect】

(1) The shape of the adhesive injection through hole and the cavity is simple, and molding of these is also easy. (2) Injection and filling of the adhesive are completed easily and in a short time. (3) The solidified shape of the adhesive is a shape that can prevent the displacement of the mold and the core group, and the assembly is strong. (4) Since no adhesive penetrates into the joint surface of the mold or core, no defective casting is generated.

[Brief description of drawings]

FIG. 1 is a plan view of a core assembly for two vehicle models of an engine crankcase according to the present invention.

FIG. 2 is a vertical sectional view of a core assembly for two vehicle models of an engine crankcase according to the present invention.

FIG. 3 is a plan view of a core assembly for one vehicle model of an engine crankcase according to the present invention.

FIG. 4 is a vertical cross-sectional view of a core assembly for one type of engine crankcase according to the present invention.

5 is a plan view similar to FIG. 1 in which a cavity is provided on both sides of the adhesive injection through hole.

6 is a vertical cross-sectional view similar to FIG. 2 in which a cavity is provided on both sides of the adhesive injection through hole.

7 is a plan view similar to FIG. 3 in which a cavity is provided on both sides of the adhesive injection through hole.

8 is a vertical cross-sectional view similar to FIG. 4, in which a cavity is provided on both sides of the adhesive injection through hole.

9 to 12 are a plan view and a vertical sectional view of a conventional method.

[Explanation of symbols]

 1 Core 2 Adhesive Injecting Through Hole 3 〃 Cavity 11 Projection 12 Adhesive Applying Groove

Claims (4)

[Claims] 1. An adhesive agent, characterized in that a sand mold such as a main mold and / or a core is provided with at least one through hole for injecting an adhesive which linearly penetrates the sand mold group. Sand mold assembly connected and glued to. 2. The unitary connection by an adhesive according to claim 1, wherein an axial cross section of the through hole is frustoconical or pyramidal.
Bonded sand mold assembly. 3. The joint side end surface of the through hole of each sand mold,
A sand mold assembly integrally bonded and bonded by an adhesive according to claim 1, wherein an adhesive injection cavity is provided. 4. In a method of combining a sand mold such as a main mold and / or a core into a predetermined shape, and integrally connecting and bonding with an adhesive, at least one through hole for inflow of an adhesive is provided in each sand mold. A method for connecting and adhering a plurality of sand molds, characterized in that a plurality of sand molds are provided, the through holes are linearly communicated and arranged, and an adhesive is injected into the communicated through holes and solidified.