KR100960268B1 - A manufacturing method of vessel engine cylinder cover and maunfactured vessel engine cylinder cover thereof - Google Patents

Abstract

PURPOSE: A manufacturing method of a cylinder cover for a ship engine and the cylinder cover manufactured thereby are provided to reduce a manufacturing time of a cylinder cover and to reduce manufacture costs. CONSTITUTION: A manufacturing method of a cylinder cover for a ship engine comprises next steps. The outside mold having the shape corresponding to the side profile of the cylinder cover for the ship engine is manufactured. The lower part model of the cylinder cover, and the top model and medium wool type are manufactured(S200). The first and the second tang establish a sleeve models(S300). The low chase and the upper chase are respectively manufactured by inserting a casting material into the space of a second molding frame(S400). The middle is installed in the mutual union and internal space(S500). The molten metal is injected into the space part of the coalesced mold and the cylinder cover molded product is manufactured(S600). The part except the cylinder cover shape is eliminated and the cylinder cover molded product and the cylinder cover original copy is manufactured(S800).

Description

Method of manufacturing cylinder cover for ship engine and cylinder cover for ship engine manufactured by the same TECHNICAL FIELD [A MANUFACTURING METHOD OF VESSEL ENGINE CYLINDER COVER AND MAUNFACTURED VESSEL ENGINE CYLINDER COVER THEREOF}

The present invention relates to a method for manufacturing a cylinder cover for a ship engine and a cylinder cover for a ship engine manufactured by the same, and more particularly, to reduce the amount of molten metal injected compared to a method for manufacturing a cylinder cover for a ship engine by using a sand casting. A method of manufacturing a cylinder cover for a marine engine and a marine engine manufactured by the same, which can reduce the manufacturing cost of a product and can produce a large amount of finer and more accurate cylinder covers for a marine engine in a short time. Relates to a cylinder cover.

One of the ship's engine parts, the cylinder cover, can be made by forging or sand casting in the original ship engine design companies' manufacturing specifications. In Korea, a number of cylinder covers for ship engines have been produced only by conventional forging methods.

The forging method is a method of manufacturing a cylinder cover through a press molding and heat treatment process by heating an ingot, which is an intermediate material, and has a merit of reducing defects such as pores and grooves inside and outside the product during press molding using a press. But there is a lot of unnecessary appendages. Therefore, there is a problem in that the manufacturing time and manufacturing cost of the cylinder cover is increased because these debris must be removed by cutting.

In order to solve this problem, a sand casting method has been widely used in recent years to produce a cylinder cover for a ship engine.

The sand casting method is a method of manufacturing a cylinder cover through heat treatment after pouring molten metal, which is melted by heat, into a constant sand mold (sand), and it can be manufactured in large quantities within a short time. This has the advantage of reducing costs. However, since the sand casting method does not have a press molding process using a press, small defects such as pores and grooves frequently occur inside and outside the product. In order to remove such defects, problems such as welding repair process occur, and in order to obtain a high quality cylinder cover in consideration of the temperature contour line according to the difference in the internal and external solidification speed of the molten metal poured into the sand mold, the upper part of the cylinder cover Since a considerable amount of riser must be additionally formed, there is a limit in lowering the manufacturing cost by increasing the recovery rate, which is a weight ratio of the cylinder cover to the total injection amount of the molten metal.

Therefore, the problem to be solved by the present invention is to solve the above problems by reducing the amount of molten metal injected during manufacturing to reduce the manufacturing cost of the product, as well as more precise and high-quality cylinder cover for ship engines of various types of fast time The present invention provides a method for producing a cylinder cover for a ship engine that can be easily mass-produced in a container, and a cylinder cover for a ship engine manufactured thereby.

Technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

Method of manufacturing a cylinder cover for a ship engine according to an embodiment of the present invention for solving the above problems is an external mold manufacturing step of manufacturing an outer mold having a shape corresponding to the side shape of the cylinder cover for a ship engine, wood, metal , A model manufacturing step of manufacturing the lower model, the upper model and the middle model of the cylinder cover with at least one of wax, gypsum and styrofoam, a first mold around the lower model and a second mold around the upper model A first ballistic sleeve model and a first ballistic sleeve formed in each of the spaces between the lower model and the first mold and the first ballistic sleeve model and a part of the space between the upper model and the second mold. Step of installing the mold frame and the ballistic sleeve model for installing the second ballistic sleeve model connected to one end of the model, and the first ballistic sleeve model is installed The lower mold, the upper part by injecting a molding sand into the space between the lower model and the first mold and the space between the second mold and the upper model and the middle model installed with the second ballast sleeve A mold and core manufacturing step of manufacturing a mold and a core respectively, a mold coalescing step of coalescing the lower mold, the upper mold and the outer mold together and placing a core in the inner space to form a coalesced mold; A molded article manufacturing step of manufacturing a cylinder cover molded article by injecting a molten metal through the tumbler made using the tumbler sleeve model into a space, and removing a portion other than the cylinder cover shape from the cylinder cover molded article to cover the cylinder. The cylinder cover text manufacturing step of manufacturing the text is included.

The mold and core manufacturing step may further include a model removal step of removing the lower model and the upper model by inverting the mold frame when the molding sand is hardened after the molding sand is added.

In the mold and core manufacturing step, the molding sand is introduced to completely cover the first ballistic sleeve model and the lower model in the space between the lower model and the first mold frame, the first ballistic sleeve model is installed The molding sand may be injected such that one end of the second ballistic sleeve model and an upper end of the upper model are exposed in a space between the upper model and the second mold in which the second ballistic sleeve model is installed. .

The mold coalescing step may include an external mold placing step of placing the external mold in close contact with the inside of the lower mold manufactured in the mold manufacturing step, and placing the core in an inner space of the lower mold manufactured in the mold manufacturing step. A core settling step and an upper mold settling step of placing the upper mold at an upper corresponding position of the lower mold and the outer mold settled.

It is preferable that the injection temperature of the said molten metal is 1500-1620 degreeC.

After the molded article manufacturing step, it may further include a surface processing step of surface processing the outer mold removed from the manufactured cylinder cover molded article.

The surface treatment may be performed through shot blast treatment.

The core model may be made of at least one of wood, metal, wax, gypsum, and styrofoam so that the empty space has a middle shape.

The outer mold can be produced by a forging or casting method.

The present invention also includes a cylinder cover for a ship engine manufactured by the manufacturing method of the cylinder cover for a ship engine.

As described above, according to the manufacturing method of the cylinder cover for ship engine according to the present invention, not only can reduce the production cost of the molten metal to be injected, but also to reduce the production cost of the product, and more precise and high quality various types of marine engine cylinder cover It can easily be mass produced in a short time.

Specific details of other embodiments are included in the detailed description and drawings.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various other forms, and it should be understood that the present embodiment is intended to be illustrative only and is not intended to be exhaustive or to limit the invention to the precise form disclosed, To fully disclose the scope of the invention to a person skilled in the art, and the invention is only defined by the scope of the claims.

Like reference numerals refer to like elements throughout. Embodiments described herein will be described with reference to perspective views and cross-sectional views showing ideal manufacturing flow charts and manufacturing processes, respectively, of the present invention.

Hereinafter, a method of manufacturing a cylinder cover for a ship engine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flow chart sequentially showing a manufacturing process according to a method for manufacturing a cylinder cover for a ship engine according to an embodiment of the present invention, Figures 2 to 12 is a manufacturing method for a cylinder cover for a ship engine according to an embodiment of the present invention 2 is a perspective view of an outer mold used to manufacture a cylinder cover for a ship engine according to an embodiment of the present invention, and FIGS. 3A, 3B, and 3C are A perspective view of a lower model, an upper model and a middle model used in the manufacture of a cylinder cover for a ship engine according to an embodiment of the present invention, respectively, FIGS. 4A and 4B are each a ship engine according to an embodiment of the present invention. 5A, 5B and 5C are perspective views illustrating a state in which a mold frame and a ball sleeve sleeve are installed in the lower model and the upper model, respectively, during the manufacturing process of the cylinder cover for FIG. Cylinder cover for ship engines according to 6A, 6B, and 6C are perspective views illustrating a casting sand injection process of the manufacturing process, respectively, of the foundry sand shown in FIG. 5 during a manufacturing process of a cylinder cover for a ship engine according to an embodiment of the present invention; A cross-sectional view of the lower mold, the upper mold and the middle manufactured through the feeding process are cut along the lines XX, YY and ZZ of FIGS. 5A, 5B and 5C, and FIG. 8 is a cross-sectional view for explaining a process of injecting molten metal into the space of the coalescence mold of FIG. 7, and FIG. 9 is FIG. 8. 10 is a cross-sectional view of a marine engine cylinder cover molded product manufactured by molten metal injection, and FIG. 10 is a perspective view for explaining a surface treatment process for recycling an external mold removed during manufacture of the marine engine cylinder cover molded product of FIG. 11 is a cylinder cover for the ship engine of Figure 9 A cross-sectional view for explaining a process of manufacturing an original cylinder cover for a ship engine through a cutting process of a molded article, and FIG. 12 is a perspective view of a cylinder cover manufactured according to a method for manufacturing a cylinder cover for a ship engine according to an embodiment of the present invention. .

Prior to the description, the cylinder cover 600 manufactured by the method for manufacturing a cylinder cover for a ship engine according to an embodiment of the present invention is as shown in FIG. 12, and the shape and size of the cylinder cover 600 are for a ship engine. Of course, it is obvious that various modifications are possible depending on the shape and specification of the cylinder.

Method of manufacturing a cylinder cover for a ship engine according to an embodiment of the present invention first has an inner shape corresponding to the side shape of the cylinder cover 600 for ship engine shown in Figure 12 as shown in Figures 1 and 2 The outer mold 100 is manufactured (S100).

The outer mold 100 may be made using a general forging method or a casting method using a metal material such as steel, cast iron, etc. according to the outer shape of the cylinder cover 600 to be manufactured, and for a marine engine according to an embodiment of the present invention. It is also possible to make it by the manufacturing method of a cylinder cover. The outer mold 100 may be implemented in various ways according to the shape and specification of the cylinder cover 600 to be manufactured, and the chemical composition or the heat treatment method may be variously applied without particular limitation.

Also, as shown in FIGS. 1 and 3 (a), (b) and (c), the lower model corresponding to the shape of the cylinder cover 600 with at least one of wood, metal, wax, gypsum and styrofoam, respectively. 201, the upper model 202 and the middle model 203 are manufactured (S200).

That is, as shown in (a) of FIG. 3, at least one of wood, metal, wax, gypsum, and styrofoam is manufactured to form a protruding cylindrical lower model 201 having a predetermined diameter d1 on the base plate (S210). As shown in (b) of FIG. 3, an upper model 201 having a cylindrical shape protruding a predetermined diameter d2 on another base plate is produced (S220). On the other hand, as shown in Fig. 3 (c), two of the core model 203 having a half-shaped half of the shape of the core 303 of the inner empty space is produced (S230).

Here, each of the models 201, 202, and 203 may be manufactured by hand or by an automated device, and in the case of manufacturing using a metal material, it may generally be manufactured by a casting method.

In the present embodiment, the diameter d1 of the lower model 201 is larger than the diameter d2 of the upper model 202, but is not limited thereto, and may be changed according to the shape of the cylinder cover 600. In addition, unlike the present embodiment, the middle core model 203 may be manufactured as one in order to have the overall shape of the middle core 303 shape of FIG. 6, and may be manufactured in the same manner as the lower model 201 and the upper model 202. It's okay.

Next, as shown in Figs. 1 and 4 (a) and (b), respectively, the molds 21 and 22 and the ballistic sleeve model 25, respectively, in the lower model 201 and the upper model 202, respectively. 26) is installed (S300).

Looking at this in detail as shown in Figure 4 (a) is installed a first mold frame 21 around the lower model 201 (S310), between the lower model 201 and the first mold frame 21 In the space portion of FIG. 6A, the first ballistic sleeve model 25 forming the lower flow path 305 illustrated in FIG. 6A is installed (S320).

In addition, as shown in (b) of FIG. 4, a second mold frame 22 is installed around the upper model 202 (S330), and a space between the upper model 202 and the second mold frame 22 is provided. A second ballistic sleeve model 26 is connected to one end of the first ballistic sleeve model 25 and forms the upper ballway 305 shown in FIG. 6B (S340).

In addition, the two inner core model 230 separately manufactured so that the inside has an overall shape of the middle 303 shape of FIG. 6 is merged with each other (S350).

Then, as shown in FIGS. 1 and 5 (a), (b) and (c), respectively, the model 201 and 202 after the injection molding process 40 (S410) and the molding sand curing process (S420). The lower mold 301, the upper mold 302, and the core 303 shown in FIGS. 6A, 6B, and 6C are manufactured through the removing process (S400).

First, referring to the molding sand injection process (S410), as shown in FIG. 5A using the molding sand kneader 30, a first portion of the space between the lower model 201 and the first mold 21 is formed. The casting sand 40 is introduced so that the ballistic sleeve model 25 and the lower model 201 are completely covered. Also, as shown in FIG. 5B, one end of the second ballistic sleeve model 26 and an upper end of the upper model 202 are provided in the space between the upper model 202 and the second mold frame 22. Inject the foundry sand 40 so that it is exposed. In addition, the foundry sand 40 is introduced into the internal space of the middle model 203.

Since the injected molding sand 40 contains a curing agent, after a time, the injected molding sand 40 is hardened and hardened (S420).

When the molding sand 40 is hardened and hardened, the mold frame 21 and 22 are turned upside down to remove the lower model 201 and the upper model 202, respectively, and even the middle model 203 is removed (S430). ), (b) and (c), the lower mold 301 with the lower runway 305, the upper mold 302 with the upper runway 306, and the core 303 are completed.

Next, as shown in FIG. 1 and FIG. 7, the lower mold 301, the upper mold 302, and the outer mold 100 are merged with each other, and the core 303 is placed in the inner space thereof so that the coalescence mold 300 is formed. Make (S500).

In detail, first, the lower mold 301 is disposed at a predetermined position, and then the external mold 100 is inserted into the inner side of the lower mold 301 to be placed in close contact (S510), and then the external mold 100 is placed in close contact. The core 303 is placed in a predetermined position in the inner space of the lower mold 301 (S520), and finally, the lower mold 301 and the outer mold are connected to each other so that the lower raceway 305 and the upper raceway 306 are interconnected. When the upper mold 302 is placed upside down again at the upper corresponding position of the mold 100 (S530), the coalescing mold 300 is completed.

The reason why the upper mold 302 is turned upside down is that the lower surface of the upper mold 302 which is in close contact with the upper surface of the lower mold 301 when encased is found as shown in (b) of FIG. 5. This is because the flatness according to the stack of 30 is excellent and the adhesion with the upper mold 302 is excellent.

The order of placing the outer mold 100, the core 303 and the upper mold 302 in the lower mold 301 for the completion of the coalescence mold 300 described in this embodiment is according to the convenience and necessity of the manufacturing process. you can change it.

Thereafter, as shown in FIGS. 1 and 8, molten iron is melted using various melting furnaces through a water supply 306 in the space portion of the mold 300 incorporated into the molten metal 60 stored in the molten metal storage unit 50. Carefully poured to prevent other impurities from flowing (S610), and solidified through the step (S620) of cooling the molten metal 60 to remove the coalescence mold 300 using a method such as external impact ( S630), the cylinder cover molded article 400 shown in FIG. 9 is manufactured (S600).

Here, the temperature of the molten metal 60 to be injected is 1500 to 1620 ℃, more preferably 1540 to 1580 ℃ in consideration of both the cooling rate of the molten metal 60 and the refractory degree of the coalescence mold 300 at the time of injection, the chemical The component shall be of the ship engine design company's requirements. In addition, care must be taken not to introduce other impurities during injection of the molten metal 60.

The injected molten metal 60 is solidified from a liquid state to a solid state while being cooled. Since the outer mold 100 of the metal material placed in close contact with the lower mold 301 of the molding sand material has better thermal conductivity than the lower mold 301, the molten metal 60 in contact with the outer mold 100 when the molten steel 60 is solidified. From the first cooling and the distance from the outer mold 100, the temperature contour line is formed to slow the cooling rate of the molten metal 60 toward the central portion and the upper portion. Therefore, the shrinkage hole moves rapidly to the upper portion of the molten metal 60 due to the influence of the changed temperature contour due to the increase in the cooling rate of the molten metal 60 by the external mold 100. There is no shrinkage hole or groove defect on the outside. Through this, it is possible to greatly reduce the amount of the molten metal 60 to be filled in the space above the portion corresponding to the shape of the cylinder cover 600.

The outer mold 100 of the coalescence mold 300 removed from the solidified molten metal 60 is subjected to a surface treatment process for reuse as shown in FIGS. 1 to 10 (S700).

Surface treatment is to remove the foreign matter on the surface of the outer mold 100 by high-pressure spraying the metal ball 80 on the surface of the outer mold 100 using a high pressure injection device such as a known shot blast 70. Machine the surface smoothly.

Next, as shown in FIG. 1 and FIG. 11, after removing the hot water portion 510 and the hot water sleeve 520 which are unnecessary parts other than the shape of the cylinder cover 600 from the cylinder cover molded product 400 (S810), In the heat treatment furnace, a cylinder cover original 500 is manufactured by performing a heat treatment process such as water cooling and tampering (S820) (S800).

The heat treatment process is provided with a value required for each cylinder cover 600 which is designed as a process for satisfying various physical properties (for example, tensile strength, yield strength, elongation, hardness, etc.) required for ship engine design.

After this, finally, as shown in FIG. 1, when the final shape processing process (S900) of the original cylinder cover 500, the cylinder cover for ship engine according to the embodiment of the present invention as shown in FIG. 600) is finally completed.

On the other hand, unlike the present embodiment, the surface treatment step (S700) may be made at the same time or behind the cylinder cover original manufacturing step (S800) or the shape machining step (S900).

According to the method for manufacturing a cylinder cover for a ship engine according to the embodiment of the present invention described above, the production cost of the product can be reduced by reducing the amount of molten metal injected, as well as more sophisticated and high quality cylinders for ship engines The cover can be easily mass produced in a short time.

Although the preferred embodiment of the present invention has been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of the process using the basic concept of the present invention as defined in the following claims are also possible. It belongs to the scope of the invention.

1 is a flow chart sequentially showing a manufacturing process according to the method for manufacturing a cylinder cover for a ship engine according to an embodiment of the present invention,

2 to 12 are views for explaining the manufacturing process according to the manufacturing method of the cylinder cover for ship engine according to an embodiment of the present invention,

Figure 2 is a perspective view of the outer mold used in the manufacture of the cylinder cover for a ship engine according to an embodiment of the present invention,

3 (a), 3 (b) and 3 (c) are perspective views of a lower model, an upper model and a middle model used in the manufacture of a cylinder cover for a ship engine according to an embodiment of the present invention, respectively,

Figure 4 (a) and (b) is a perspective view showing a state in which the mold and the ball sleeve sleeve is installed in the lower model and the upper model, respectively, during the manufacturing process of the cylinder cover for ship engine according to an embodiment of the present invention,

5 (a), 5 (b) and 5 (c) are perspective views for explaining a casting sand injection process of manufacturing a cylinder cover for a ship engine according to an embodiment of the present invention, respectively;

(A), (b) and (c) of Figure 6 is a lower mold, an upper mold and a mold manufactured by the molding sand injection process shown in Figure 5 of the manufacturing process of the cylinder cover for ship engine according to an embodiment of the present invention, respectively Sectional drawing which cut | disconnected the middle core along XX line, YY line, and ZZ line | wire of (a), (b) and (c) of FIG. 5, respectively,

FIG. 7 is a cross-sectional view of a coalescing mold in which an outer mold, a core and an upper mold are incorporated into a lower mold shown in FIG. 6;

8 is a cross-sectional view for explaining a step of injecting molten metal into the space of the coalescence mold of FIG. 7;

FIG. 9 is a sectional view of a cylinder cover molded article for a marine engine manufactured by molten metal injection of FIG. 8; FIG.

FIG. 10 is a perspective view for explaining a surface treatment process for recycling an external mold removed during manufacture of a cylinder cover molded product for a ship engine of FIG. 9; FIG.

FIG. 11 is a cross-sectional view for explaining a process of manufacturing a cylinder cover original for a marine engine through a cutting process of the cylinder cover molded product of the marine engine of FIG. 9; and

12 is a perspective view of a cylinder cover manufactured according to the method for manufacturing a cylinder cover for a ship engine according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

21, 22: mold 25, 26: model of the sleeve sleeve

30: foundry sand kneader 40: foundry sand

50: molten metal storage unit 60: molten metal

70: short blast 80: metal ball

100: outer mold 201: lower model

202: upper model 203: the middle model

300: coalescing mold 301: lower mold

302: upper mold 303: middle

305: lower flowway 306: upper flowway

400: cylinder cover molded article 500: cylinder cover original

510: pressure part 520: water sleeve

600: Cylinder Cover

Claims (10)

An outer mold manufacturing step of manufacturing an outer mold having a shape corresponding to the side shape of the cylinder cover for ship engines, A model manufacturing step of manufacturing the lower model, the upper model and the core model of the cylinder cover with at least one of wood, metal, wax, gypsum and styrofoam, A first ballistic sleeve model, each having a first mold frame and a second mold frame formed around the lower model and forming a water flow in a part of the space between the lower model and the first mold frame, respectively. And a step of installing the mold frame and the ballistic sleeve model to install a second ballistic sleeve model connected to one end of the first ballistic sleeve model in a part of the space between the upper model and the second mold frame.  A space between the lower model and the first mold provided with the first ballistic sleeve model and a space between the upper model and the second mold provided with the second ballast sleeve model and the middle model A mold and core manufacturing step of manufacturing a lower mold, an upper mold and a middle core respectively by injecting molding sand, A mold coalescing step of coalescing the lower mold, the upper mold and the outer mold together and placing a core in the inner space to form a coalesced mold; A molded article manufacturing step of manufacturing a cylinder cover molded article by injecting molten metal into the space of the coalesced mold using the first ballistic sleeve model and the second ballistic sleeve model; A cylinder cover original manufacturing step of manufacturing a cylinder cover original by removing portions other than the cylinder cover shape among the cylinder cover molded articles. Method of manufacturing a cylinder cover for a ship engine comprising a. In claim 1, The mold and core manufacturing step, If the foundry sand after the molding sand is added, further comprising a model removing step of removing the lower model and the upper model by inverting the first mold frame and the second mold frame, respectively. Method for producing a cylinder cover for a ship engine. In claim 1, In the mold and core manufacturing step, The molding sand is introduced so as to completely cover the first ballistic sleeve model and the lower model in a space between the lower model and the first mold in which the first ballistic sleeve model is installed, Injecting the molding sand so that one end of the second ballistic sleeve model and the upper end of the upper model is exposed to the space between the upper model and the second mold provided with the second ballistic sleeve model Method for producing a cylinder cover for a ship engine. In claim 1, The mold coalescing step, An external mold placing step of placing the outer mold in close contact with the inside of the lower mold manufactured in the mold and core manufacturing step; A core placing step of placing the core in an inner space of the lower mold manufactured in the mold and core manufacturing step, and An upper mold placing step of placing the upper mold in the upper corresponding position of the lower mold and the outer mold placed Method of manufacturing a cylinder cover for a ship engine comprising a. In claim 1, Injection temperature of the molten metal is 1500 to 1620 ℃ Method for producing a cylinder cover for a ship engine. In claim 1, After the molded article manufacturing step, The method may further include a surface treatment step of surface-treating the outer mold removed from the manufactured cylinder cover molded article. Method for producing a cylinder cover for a ship engine. In claim 6, The surface treatment treatment Through shot blasting Method for producing a cylinder cover for a ship engine. In claim 1, The core model is a method of manufacturing a cylinder cover for a ship engine made of a hollow space inside the at least one of the wood, metal, wax, gypsum and styrofoam having a middle shape. In claim 1, The outer mold is a manufacturing method of a cylinder cover for a ship engine is produced by a forging or casting method. The cylinder cover for ship engine manufactured by the manufacturing method of any one of Claims 1-9.

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