JPS6037246A - Method for fixing core by chaplet - Google Patents

Abstract

PURPOSE:To improve the ease of operation for attaching plural chaplets and the accuracy in attaching said chaplets and to eliminate the deformation or fracture of a core by holding the chaplets with a pair of pieces and holding the pieces by core assembling members in the stage of molding the core. CONSTITUTION:Plural chaplets 2, 16, 17, 18 are held in the eight chaplet holding holes 20 formed between the opposed surfaces of a pair of pieces 3, 4 having the rectangular surfaces facing each other and bored liners 5, 6, 9, 10 in the stage of molding a core for, for example, a water jacket of a cylinder block of an engine. When the core 1 is cured, the liners 5, 6, 9, 10 and the pieces 3, 4 are removed and while the core 1 is kept held by the eight chaplets 2, 16, 17, 18, casting is performed. The ease of operation for attaching the chaplets and the accuracy in attaching said chaplets are thus improved and the deformation and fracture of the core during casting are eliminated.

Description

[Detailed description of the invention] This invention relates to a method for fixing a core.

Conventionally, when casting a water jacket for a V-cylinder block of an engine, for example, the water jacket core sometimes becomes deformed or breaks. In order to prevent the water jacket core from being deformed or broken, generally each bore insert 5.6.7.
8.Depending on the shape of the core 1, using only one core 19 may cause deformation of the core 1.
Due to insufficient prevention of breakage, it was sometimes necessary to etch two or more places, so after the core was manufactured, the core was ground and the burrs from the second spot were embedded. This method had problems such as variations in the mounting position of the keratin, poor winding of the core sand around the keratin, and increased time for burying the keratin.

The object of the present invention is to provide a method that can easily install and fix a plurality of cores in a predetermined position during molding of a core.

In order to achieve the above object, the present invention is characterized in that a plurality of cores are held by a pair of pieces, and the pair of pieces are held by a member when assembling the core during core manufacturing.

The present invention will be explained below with reference to drawings showing embodiments. 1st
In the figures to FIG. 6, 2, 16, 17, and 18 are marks, which are between the opposing surfaces of a pair of rectangular pieces 6.4, and between the piece 6.4 and the bore insert 5, 6,
9. It is held in eight keren holding holes 20 formed between 9 and 10. 11 to 15 are core outer wall types.

When the core 1 hardens, the bore inserts 5 and 6 are formed as shown in FIG.
, 9.10 and piece 6.4 are demolded. As a result, the core 1 is held in place by the eight cores 16, 17, and 18, and deformation and breakage of the core 11 are prevented during water jacket casting. 4 shows the piece 5, (6) is a plan view, (b) is a front view, and f→ is a side view.

As described above, this invention holds a plurality of cores by a pair of pieces when molding a core for a desired casting product, and holds the pair of pieces by a member when assembling the core for molding the core. This improves the workability and accuracy of attaching the keren, and also improves the ability of sand to wrap around the keren.

As a result, there is no deformation or breakage of the core during casting, and a ready-made product with quality such as a ladle can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 showing a plan view and FIG. 2 showing a front sectional view taken along line I-1 in FIG. 1. Figure 5 shows a front sectional view of the piece in the middle of demolding, Figure 4 is a piece, and Figure 4) is a plan view, fP) is a front view (corresponds to view P in Figure 6), and (c) is a side view. shows. 5 to 7 show a conventional example, FIG. 5 shows a plan view, and FIG. 6 shows a front sectional view taken along line M--■ in FIG. FIG. 7 shows a front sectional view in the middle of demolding. 1... Core 2.16, 17.18... Ken 3.4... Piece 5.6, 9.10... Bore insert (core assembly is a component)
Applicant Toyota Motor Corporation Representative Patent Attorney Oka 1) Hidehiko

Claims (1)

[Claims] A method for fixing core cores, which is characterized in that a plurality of cores are held by a pair of pieces, and the pair of pieces is held by a member during core assembly during core manufacturing.