KR20100046491A - Structure of mold for preventing contraction dead bolt area of cylinder block - Google Patents

Abstract

PURPOSE: A mold structure for preventing the contraction of a cylinder block head bolt part is provided to reduce the weight of the cylinder block by deforming a shape of the mold and rapidly cooling the head bolt part using a chiller. CONSTITUTION: In a mold(10) structure for preventing the contraction of a cylinder block head bolt part, a chiller(20) is inserted into a part in which the head bolt part of the cylinder block is formed. The chiller is supported with a truss core(14) and a water jacket core(12) of the mold. The chiller has a bottle shape in which upper and lower ends are opened. A plurality of holes are included on the surface of the chiller.

Description

STRUCTURE OF MOLD FOR PREVENTING CONTRACTION DEAD BOLT AREA OF CYLINDER BLOCK}

The present invention relates to a mold for cylinder block roughening. More specifically, the present invention relates to a mold structure for preventing shrinkage of a cylinder block head bolt portion, which minimizes deformation of the head bolt portion of the cylinder block by shrinkage during casting.

In general, the cylinder block is manufactured through a casting process by a mold. The molten metal is injected into the mold consisting of the upper mold and the lower mold, cooled, and the mold is separated to take out the product. The extracted product is heat treated and finished to finish the cylinder block.

Here, injecting molten metal into the mold during the casting process of the cylinder block, and cooling / solidifying, the cooling rate difference and deformation according to the entire mold occurs.

In particular, the cylinder block of the truss structure of the cylinder block is a structure that is difficult to heat dissipation during casting around the head bolt boss is frequently caused by deformation caused by shrinkage. In addition, in the case of a high strength special cast iron (CGI) material compared to the conventional gray cast iron, the deformation due to shrinkage occurs because the surface tension is high and the cooling is performed at the latest in the cooling process after casting.

Since the head bolt part of the cylinder block has the greatest explosion pressure during combustion, problems such as deterioration in durability when the shrinkage occurs and water leakage through the shrinkage part during the head bolt part processing are generated.

Accordingly, the shrinkage deformation was improved by forming grooves for improving the fluidity of the molten metal in the head bolt portion of the mold. However, the above-described structure causes the thickness of the cylinder block manufactured by the thickness of the groove formed in the mold to increase the thickness of the cylinder block causes a disadvantage that the weight of the cylinder block increases.

Thus, by improving the structure of the mold is to be quenched in the head bolt portion of the cylinder block provides a mold structure to prevent shrinkage deformation due to slow cooling.

In addition, it provides a mold structure that can reduce the weight of the cylinder block to be manufactured.

To this end, the apparatus may have a structure in which a chiller is inserted into a head bolt portion forming position of a cylinder block in a mold structure for casting a cylinder block.

Accordingly, the head bolt portion may be quenched without deforming the shape of the mold, and thus uniform solidification may be achieved. Therefore, the shrinkage phenomenon of the head bolt portion can be prevented.

The chiller may be supported and fixed by the truss core and the water jacket core of the mold.

The chiller may be formed in a cylindrical shape with the upper and lower ends open. The chiller may be formed in a shape corresponding to the cross-sectional shape of the head bolt portion. A plurality of holes may be formed on the surface of the chiller at intervals. The hole may be formed at a portion of the surface of the chiller corresponding to the side of the head bolt portion of the cylinder block.

In addition, the chiller may have a structure in which the inner diameter of the rear end is relatively smaller than the front end along the moving direction of the molten metal.

The chiller may be made of tin plated material.

As such, the cylinder block head bolt portion may be quenched through the chiller to prevent shrinkage deformation due to slow cooling.

In addition, as compared with the conventional mold structure that deforms the shape of the mold to induce quenching, by quenching the head bolt through the chiller, there is an advantage that the weight of the cylinder block can be reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

It is noted that the figures are schematic and not drawn to scale. The relative dimensions and ratios of the parts in the figures have been exaggerated or reduced in size for clarity and convenience in the figures and any dimensions are merely exemplary and not limiting. And the same structure, element or part that appears in more than one figure the same reference numerals are used in different embodiments to indicate corresponding or similar features.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the term "comprising" embodies a particular characteristic, region, integer, step, operation, element, and / or component, and other specific characteristics, region, integer, step, operation, element, component, and / or group. It does not exclude the presence or addition of.

Unless defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Commonly defined terms used are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

Embodiments of the invention described with reference to a perspective view specifically illustrate an ideal embodiment of the invention. As a result, various modifications of the illustrations, for example, manufacturing methods and / or specifications, are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture. For example, regions shown or described as flat may have properties that are generally rough and / or rough. Also, the portion shown as having a sharp angle may be rounded. Thus, the regions shown in the figures are merely approximate, and their shapes are not intended to depict the exact shape of the regions, nor are they intended to limit the scope of the present invention.

1 shows a cylinder block 100 manufactured by a mold according to the present embodiment. The cylinder block 100 is manufactured by injecting molten metal into a mold molded into an upper mold and a lower mold, and then cooling the mold. The cylinder block 100 is formed with a water jacket 130 formed by the water jacket core of the mold and a truss 120 formed by the truss core of the mold. Between the water jacket 130 and the truss 120 is formed a head bolt portion 110 for processing the bolt fastening hole.

The cylinder block 100 shown in FIG. 1 is manufactured by the mold structure according to the present embodiment, and it can be confirmed that the head bolt part 110 is not contracted inward.

Referring to Figure 2 looks at the mold structure that can prevent the shrinkage deformation of the head bolt unit 110 as follows.

The mold 10 has a structure in which a chiller 20 is inserted at a head bolt portion forming position formed between a water jacket core 12 for forming a water jacket and a truss core 14 for forming a truss. The chiller (Chiller) 20 is a casting chiller installed at a portion where a tissue is to be made dense using a quenching effect. In this embodiment, the chiller 20 is made of a steel sheet of tin plating material.

Accordingly, the chiller 20 is quenched by the chiller 20 inserted into the head bolt portion forming position without deforming the shape of the mold 10, and thus uniform solidification can be achieved. Therefore, the shrinkage phenomenon of the head bolt unit 110 can be prevented.

The chiller 20 has a cylindrical shape as shown in FIG. 3. The chiller 20 has a structure in which the front end is opened and the rear end is narrowed inward along the moving direction of the molten metal during casting. As such, the rear end of the present chiller 20 has a relatively small inner diameter as compared to the front end, thereby slowing down the flow of water to prevent excessive cooling.

In addition, a plurality of holes 22 are formed on the surface of the chiller 20 at intervals. As the water 22 flows into and out of the chiller 20 by the hole 22, the chiller 20 may be dissolved in the water more smoothly. The size and shape of the hole are not particularly limited.

The holes may be formed evenly over the entire surface of the chiller 20. In this embodiment, the hole 22 is formed in a position corresponding to the side of the head bolt portion of the cylinder block 100. In this way, it is possible to achieve rapid quenching of the molten metal in the side of the head bolt portion 110, which is substantially contracted.

4 and 5 illustrate a structure in which the chiller 20 having the above-described structure is installed in the mold 10.

According to the above drawings, the present chiller 20 is supported by the truss core 14 and the water material kit core 12 of the mold 10 and fixed to the head bolt portion forming position.

The truss core 14 of the mold 10 is a core for forming the truss of the cylinder block 100. In addition, the water jacket core 12 is a core for forming a water jacket of the cylinder block 100. Water is injected into the empty space between the truss core 14 and the water jacket core 12 of the mold 10 to form the head bolt part 110 of the cylinder block 100.

Accordingly, the chiller 20 is inserted into the empty space of the mold 10 forming the head bolt portion and is pressed by the truss core 14 and the water jacket core 12 to be supported.

Hereinafter, the operation of the mold will be described with reference to FIG. 6.

6 shows a comparison between a mold according to the prior art and a mold according to the present embodiment.

The mold 10 according to the present embodiment has a structure in which a chiller 20 is inserted into a head bolt portion forming position. Accordingly, the molten water injected into the head bolt portion forming position of the mold 10 is quenched by the chiller 20. The chiller 20 is dissolved in the water and removed. As such, the water is quenched at the head bolt portion forming position, thereby preventing the head bolt portion 110 from being deformed by shrinkage. Here, as the mold 10 includes the chiller 20 as described above, a separate shape change for improving the fluidity of the metal in the mold 10 is not required.

However, in the prior art, the liquidity of the molten water is improved at the head bolt forming position, thereby rapidly cooling the molten water. Therefore, the prior art is to form a groove (H) for the smooth flow of the molten metal in the mold (M). Therefore, the cylinder block manufactured by the groove forming depth is added to increase the weight of the cylinder block.

As described above, the mold structure is capable of quenching the head bolt portion without increasing the thickness of the flesh of the cylinder block manufactured in comparison with the prior art, thereby preventing deformation due to shrinkage of the head bolt portion.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

1 is a plan view showing a cylinder block manufactured according to the present embodiment.

2 is a perspective view showing a mold structure according to the present embodiment.

3 is a perspective view showing a chiller according to the present embodiment.

4 is a perspective view showing a state in which a chiller is fixed to a mold according to the present embodiment.

5 is a cross-sectional view of FIG. 4 according to the present embodiment.

6 is a view showing the mold structure according to the present embodiment in comparison with the conventional structure.

Explanation of symbols on the main parts of the drawings

10 mold 12 cooling jacket core

14: truss core 20: chiller

22: hall

Claims (8)

In the mold structure for the cylinder block casting, Mold structure for preventing the cylinder block head bolt portion shrinkage is inserted into the head bolt portion forming position of the cylinder block. The method of claim 1, The chiller is a mold structure for preventing the contraction of the cylinder block head bolt portion is supported and fixed by the truss core and the water jacket core of the mold. The method according to claim 1 or 2, The chiller is a mold structure for preventing the cylinder block head bolt portion contraction of the upper and lower ends of the cylindrical shape. The method of claim 3, wherein The chiller is a mold structure for preventing the cylinder block head bolt portion shrinkage formed with a plurality of holes on the surface. The method of claim 4, wherein The hole is a mold structure for preventing the cylinder block head bolt portion shrinkage is formed in a portion corresponding to the side of the head bolt portion of the cylinder block. The method of claim 5, The chiller is a mold structure for preventing the shrinkage of the cylinder block head bolt portion is a structure in which the inner diameter of the rear end is relatively smaller than the front end along the moving direction of the molten water. The method of claim 6, The chiller is a mold structure for preventing the cylinder block head bolt portion shrinkage is formed in a shape corresponding to the cross-sectional shape of the head bolt portion. The method of claim 7, wherein The chiller is a mold structure for preventing shrinkage of the cylinder block head bolt portion made of tin plating material.

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