KR20020054790A - Manufacturing method of water jacket core for cylinder block casting - Google Patents

Abstract

PURPOSE: A method for forming a water jacket core for cylinder block casting is provided to prevent damage during forming due to thickness difference of the core by forming the insert core after interposing an insert core between each cylinders of a water jacket core forming a cooling water passage of an engine at outside the cylinders. CONSTITUTION: In a method for forming a water jacket core for cylinder block casting in which the water jacket core(1) for cylinder block casting assembled between a bore core and front, rear, left and right side cores is manufactured, the method comprises a first step(S1) of forming an insert core(9) for mounting the insert core(9) onto a tiller part of a water jacket core(1) corresponding to a space between each cylinders; a second step(S2) of installing the insert core(9) formed in the first step at a corresponding position between each cylinders of a whole water jacket core mold(11); and a third step(S3) of forming a water jacket core finished product by blowing after injecting mold sand into the water jacket core mold(11), wherein the insert core(9) is consisted of a sand tiller made of the mold sand.

Description

Water Jacket Core Molding Method for Cylinder Block Casting {MANUFACTURING METHOD OF WATER JACKET CORE FOR CYLINDER BLOCK CASTING}

The present invention relates to a method for forming a water jacket core for cylinder block casting, and more particularly, an insert core is formed between each cylinder portion of a water jacket core that forms a coolant passage of an engine outside each cylinder when the cylinder block is cast. The present invention relates to a water jacket core molding method for cylinder block casting which prevents breakage during molding due to a difference in core thickness.

In general, a water jacket formed as a coolant passage is formed inside the cylinder block of the engine for automobiles to serve to cool the combustion heat of the engine.

The cylinder block forming the water jacket therein is manufactured by casting, in which the water jacket core forming the water jacket portion has four cylindrical waters to surround each bore core, as shown in FIG. 2. The jacket cores 1 are interconnected and integrally formed, and the two water jacket cores 1 are provided with protrusions 3 for securing cooling water flow and access passage spaces at the lower side of the water jacket cores. The jacket core 1 is composed of core prints (not shown, front core prints 5) on the front and rear sides.

However, the water jacket core having the configuration as described above has too narrow a gap when forming the water jacket core of the portion corresponding to each cylinder, which causes breakage of the core during molding or cannot withstand the pressure of the melt during casting. Problems such as deformation are included.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a coolant passage between the cylinders of the water jacket core which forms a coolant passage of the engine outside the respective cylinders when the cylinder blocks are cast. The present invention provides a method for forming a water jacket core for cylinder block casting which prevents breakage during molding due to a difference in core thickness by molding through an insert core.

1 is a view showing a water jacket core forming method for casting a cylinder block according to the present invention.

2 is a perspective view of a cylinder block casting water jacket core formed by the present invention.

In order to realize this, the water jacket core molding method for cylinder block casting according to the present invention is a cylinder block casting water jacket for manufacturing a cylinder block casting water jacket core assembled between a bore core and a front, rear, left and right side cores. In the core molding method,

A first step of forming an insert core for mounting to the tiller portion of the water jacket core corresponding to each cylinder;

A second step of installing the insert core molded in the first step at a corresponding position of the entire water jacket core mold;

And a third step of molding the finished product of the water jacket core by blowing the mold yarn into the water jacket core mold after the second step.

The insert core is characterized in that consisting of a sand-tiller made of mold.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described in detail.

1 is a view showing a method for forming a water jacket core for a cylinder block casting according to the present invention, the method for forming a water jacket core for a cylinder block casting according to the present invention is a bore core (not shown) and before, after, left, In manufacturing the water jacket core 1 for the cylinder block casting assembled between the right side cores (not shown), first, for mounting to the tiller part 7 of the water jacket core 1 corresponding to each cylinder. The insert core 9 is molded, in which case the insert core 9 is made of a sandtiller made of mold sand (S1).

Then, the molded insert core 9 is installed at a position corresponding to a portion between the cylinders of the entire water jacket core mold 11 (S2).

Subsequently, the water jacket core die 11 is blown with a molding yarn corresponding to the entire water jacket core 1 to form a finished product of the water jacket core 1 by blowing, whereby the space between the cylinders is narrow. The water jacket core is to be molded. (S3)

Accordingly, the water jacket core 1 formed by the above-described water jacket core forming method for the cylinder block casting has an insert core 9 separately formed between the cylinders of the entire water jacket core mold 11. In the state of being interposed, by molding together during the blowing of the entire water jacket core 1, it is possible to prevent the breakage of the portion of the tiller portion 7 with a narrow gap of the water jacket core 1 during molding, and at the time of casting It is manufactured to withstand the melt pressure sufficiently.

As described above, according to the method of forming a water jacket core for a cylinder block casting according to the present invention, the water jacket core is formed by inserting an insert core, which is separately formed by a molding yarn, in a portion where the gap between the water jacket core mold is narrow. By molding together during the blowing of the water jacket core, there is an effect of preventing damage to the water jacket core, and also has an effect that can be sufficiently tolerated by the melt pressure during casting.

Claims (2)

In a method of forming a water jacket core for cylinder block casting, which manufactures a water jacket core for casting a cylinder block that is assembled between a bore core and front, rear, left and right side cores, A first step of forming an insert core for mounting to the tiller portion of the water jacket core corresponding to each cylinder; A second step of installing the insert core molded in the first step at a corresponding position between each cylinder of the entire water jacket core mold; And a third step of forming a water jacket core finished product by blowing the mold yarn into the water jacket core mold after the second step. The method of claim 1, wherein the insert core A method of forming a water jacket core for cylinder block casting, comprising: a sand tilter made of mold sand.