KR100580725B1 - Steel material to insert between the water jacket core and oil passage core - Google Patents

Abstract

The present invention not only provides a steel insert member for preventing the water jacket core from floating toward the oil passage core in the metal solution injection process for the manufacture of the cylinder head, and also uses the steel insert member to It relates to a manufacturing method and a cylinder head formed by the manufacturing method,

In the manufacturing process of the cylinder head, the process of injecting the metal solution with the water jacket core and the oil passage core interposed between the upper mold and the lower mold to form the water jacket and the oil passage provided in the cylinder head boss. In the method of forming a cylinder head, the water jacket core and the oil passage to prevent the water jacket core is floating in contact with the upper surface and the oil passage core of the water jacket core in the metal solution injection step. In the middle of the core is characterized in that the metal solution injection step is carried out after performing a steel insert member insert step for positioning the separate steel insert member.

Moreover, in the cylinder head manufactured by the above-mentioned cylinder head manufacturing method,

In the middle of the middle deck boundary between the water jacket and the oil passage is characterized in that the steel insert member for preventing the water jacket core is formed integrally with the middle deck.

Cylinder head, steel insert member, water jacket, oil passage

Description

Steel insert member used in the manufacture of cylinder head and the method of manufacturing the cylinder head using the steel insert member and the cylinder head manufactured by the manufacturing method {Steel material to insert between the water jacket core and oil passage core}

1 shows a steel insert member formed by the present invention.

2 is a view for explaining a cylinder head manufacturing process using a steel insert member according to the present invention.

3 is a cross sectional view of a main portion of a cylinder head in which a steel insert member is used.

4 is an enlarged cross-sectional view of a steel insert member according to the present invention.

5 to 6 are views for explaining the conventional technology.

※ Explanation of code for main part of drawing

30: mold 31: lower mold

32: upper mold 33: water jacket core

33a: upward protrusion 34: oil passage core

34a: downward protrusion 40: cylinder head

42: Middle Deck 43: Water Jacket

44: oil passage 50: steel insert member

51 body 52, 53 flange

54: water jacket core seating groove 55: oil passage core seating groove

S: Spiny Pattern

The present invention relates to a method of manufacturing a cylinder head using a steel insert member and a steel insert member used in the manufacture of a cylinder head, and a cylinder head manufactured by the manufacturing method. More specifically, a metal solution injection process for manufacturing a cylinder head. In addition to providing a steel insert member for preventing the water jacket core from floating toward the oil passage core in the process, a method of manufacturing a cylinder head using the steel insert member described above, and a cylinder head formed by the manufacturing method It is about.

Inside the cylinder head constituting the engine together with the cylinder block, a combustion chamber is formed together with a piston and a cylinder, and on the outside thereof, a plurality of holes for attaching an intake and exhaust manifold, an exhaust valve mechanism, a spark plug, and the like, and bolts for fixing them. Ball and so on.

In addition, a water jacket for the water-cooled engine is formed on the outer portion surrounding the intake and exhaust port including the combustion chamber of the cylinder head, and an oil passage for passing the oil is formed so that the oil necessary for the operation of the engine can be supplied to each part. . The water jacket and oil passage provided on the cylinder head are formed during the casting of the cylinder head.

In the casting process of the cylinder head, as shown in FIG. 5, the lower mold 11 including the combustion chamber and the upper mold 12 constituting the upper surface of the cylinder head are assembled to form the mold 10, and the lower mold ( 11) and the molten metal is injected in a state in which the water jacket core 13 and the oil passage core 14 for forming the water jacket and the oil package are positioned between the upper mold 12.

Meanwhile, the water jacket core 13 formed of sand during the injection of the molten metal may be deformed and corroded by the pressure of the molten metal and heat during the injection of the molten metal, thereby preventing the phenomenon of contacting the oil passage core 14. Between the water jacket core 13 and the oil passage core 14, the injury prevention means for preventing the injury of the water jacket core 13 is provided. As an anti-floating means of the water jacket core 13, it has been common to form a flotation prevention protrusion 15 in the middle of the upper side of the water jacket core 13.

In addition, while injecting the metal solution into the mold 10 assembled as described above, while shaking off the water jacket core 13 and the oil passage core 14 made of sand in the process of coagulation and spinning, FIG. 6. As shown in the drawing, only the metal middle decks 21 and 22 of the metal cylinder head 20 remain.

Therefore, a hole 25 is formed by the above-mentioned anti-floating protrusion 15 during the middle deck 22 between the water jacket 23 and the oil passage 24 of the cylinder head 20. ), A step of bolt-assembling the sealing plug 26 separately manufactured in the above-described hole is necessary.

However, in the manufacturing method of the cylinder head as described above, even if the anti-float protrusion is formed on the water jacket core, both the water jacket core and the oil passage core are formed of sand of the same material. This prevented complete injury prevention of the water jacket core at the time of molten aluminum. In addition, not only the process of mounting the sealing plug has to be added, but also there is a problem in that a crack occurs in the intermediate deck of the cylinder head provided between the water jacket and the oil passage in the drilling process and the mounting for the sealing plug mounting. In addition, in the case of forming a gush in the boss of the portion to which the sealing plug is mounted in order to reduce the occurrence of such cracks, there was a problem that causes bubbles and shrinkage failure in the casting process.

Accordingly, the present invention has been made to solve the above problems, and provides a steel insert member for preventing the water jacket core from floating toward the oil passage core in the metal solution injection process for the manufacture of the cylinder head. Rather, it is an object to provide a method of manufacturing a cylinder head using the steel insert member and a cylinder head formed by the manufacturing method.

The present invention as a means for achieving the above object,

In the manufacturing process of the cylinder head, the process of injecting the metal solution with the water jacket core and the oil passage core interposed between the upper mold and the lower mold to form the water jacket and the oil passage provided in the cylinder head boss. In the method for forming the cylinder head,

In order to prevent the water jacket core from floating in the metal solution injection process and contacting the upper surface of the water jacket core and the oil passage core, a separate steel insert member is disposed between the water jacket core and the oil passage core. After performing the steel insert member insert process to position, it is characterized by performing a metal solution injection process.

Moreover, in the cylinder head manufactured by the above-mentioned cylinder head manufacturing method,

In the middle of the middle deck boundary between the water jacket and the oil passage is characterized in that the steel insert member for preventing the water jacket core is formed integrally with the middle deck.

And the present invention is a steel insert member used in the cylinder head manufacturing method described above,

A body of a failure shape in which flanges are formed on the lower side and the upper side, respectively;

A water jacket seating groove for guiding the body to be seated in an upward protrusion of the water jacket core projecting a predetermined section toward an upper portion;

An oil passage seating recess for allowing the body to be seated in a downward protrusion of the oil passage core protruding a predetermined section toward a lower portion; Characterized in that configured to include.

EMBODIMENT OF THE INVENTION Hereinafter, the structure and effect | action of the steel insert member by this invention, and the detailed description about the manufacturing method of the cylinder head using this steel insert member are demonstrated with attached drawing.

1 is a view showing a steel insert member formed by the present invention, Figure 2 is a view for explaining a cylinder head manufacturing process using the steel insert member according to the present invention, Figure 3 is a steel insert according to the present invention Fig. 4 is an enlarged cross sectional view of a steel insert member for explaining another embodiment of the present invention.

Reference numeral 50 in the drawings indicates a steel insert member according to the present invention, and reference numeral 30 indicates a mold used in the manufacturing process of the cylinder head according to the present invention.

The mold 30 has a state in which a water jacket core 33 and an oil passage core 34 are accommodated between the lower mold 31 and the upper mold 32 as in the conventional method of manufacturing a cylinder head. . By the way, in the mold 30 for manufacturing the cylinder head according to the present invention, the means for preventing the injury of the water jacket core 33 is different from the case of the prior art, and the means for preventing the injury of the water jacket core is a water jacket. A sand core protruding from the core itself is not used, and a method in which a separate steel insert member 50 is positioned between the water jacket core 33 and the oil passage core 34 is applied.

The body 51 of the steel insert member 50 has its outer periphery at its lower side and its upper side extending outwards, so that flanges 52 and 53 are provided to form a failure shape. The water jacket core seating groove 54 and the oil passage core seating groove 55 are formed on the lower surface and the upper surface of the body 51 toward the inside of the body, respectively.

The water jacket core seating groove 54 and the oil passage core seating recess 55 are each formed in a trapezoidal cross-sectional shape, and the water jacket core seating recess 54 is formed in a lower light narrow shape and the oil passage core is formed. The seating groove 55 is formed in a normal light and narrow shape. That is, the water jacket core seating groove 54 and the oil passage core seating groove 55 are formed in a shape in which the diameter thereof gradually decreases from the outer side to the inner side.

In addition, the depth of the water jacket seating groove 54 is preferably formed to be deeper than the depth of the oil passage seating groove 55, which is the state that the steel insert member 50 is located in the mold 30 This is to make it more stable.

On the other hand, the surface of the body 51 of the steel insert member 50 is formed with a spiny pattern (S) so that the bonding force between the molten metal and the steel insert member 50 in the molten metal injection process can be improved It is preferable. Spiry shape is formed by passing the cross-sectional shape on the surface to which the molten metal touches, as if thorns are raised, and the surface area where the molten metal is in contact is enlarged, and the molten metal penetrates between the uneven gaps. Even after the casting process, the bonding force between the metal and the metal may be improved. As such, the steel insert member 50 having the spiny pattern S formed on the surface thereof is preferably formed by a centrifugal casting method.

The middle of the upper surface of the water jacket core 33 for manufacturing the cylinder head and the lower surface of the oil passage core 34 is the water jacket core seating groove 54 and the oil passage core of the steel insert member 50 described above. An upwardly projecting portion 33a and a downwardly projecting portion 34a are formed to fit in the seating grooves 55, respectively.

Injecting a molten metal such as aluminum into the mold 30 in a state where the steel insert member 50 is located between the water jacket core 33 and the oil passage core 34 in the manufacturing process of the cylinder head. Will go through.

After the injection of the molten metal is finished and a predetermined curing time has elapsed, the above-described mold 30 is demolded to demold the cylinder head 40 produced by the above process. When degassing, the water jacket core 33 and the oil passage core 34 formed of sand are separated from the mold and discharged, and only the deck portion condensed with metal remains in the cylinder head 40.

The above-mentioned steel insert member 50 remains in the middle deck 42 between the water jacket 43 and the oil passage 44 of the cylinder head 40 formed as described above. Since the surface is manufactured by the spiny method, the main metal material constituting the cylinder head 40 is formed in a more solid state.

Therefore, since no hole is formed between the water jacket 43 and the oil passage 44 of the cylinder head 40, the mounting process of the member such as the sealing plug used in the cylinder head manufacturing method according to the prior art is eliminated. . As a result, the drilling or mounting process for mounting the sealing plug is eliminated, which is advantageous in terms of the rigidity of the middle head 42 of the cylinder head 40.

In addition, metal chips can be prevented from penetrating into the water jacket during the drilling of the sealing plug, and the gasket additionally mounted for sealing at the time of the sealing plug is eliminated, thereby reducing the number of components constituting the cylinder head. do.

According to the invention as described above, in the case of the prior art, as the anti-floating means for preventing the water jacket core from floating in the molten metal injection process for the production of the cylinder head is used instead of the sand core manufactured separately, The hole in the middle deck between the oil jacket and the water jacket of the cylinder head is inevitably created. Therefore, not only the process for sealing the holes created in the middle deck is deleted, but also the problem that the thickness of the part where the means for preventing the injuries of the water jacket core are provided is thickened more than necessary is solved. will be.

Claims (8)

delete In the manufacturing process of the cylinder head, the process of injecting the metal solution with the water jacket core and the oil passage core interposed between the upper mold and the lower mold to form the water jacket and the oil passage provided in the cylinder head boss. To form a cylinder head, wherein the water jacket core 33 is prevented from being floated in the metal solution injection process so as to be in contact with the upper surface of the water jacket core and the oil passage core 34. In the middle between the 33 and the oil passage core 34, a steel insert member insert process for positioning a separate steel insert member 50 is performed, followed by a metal head injection process. In the cylinder head, In the middle of the middle deck 42 between the water jacket 43 and the oil passage 44, a steel insert member 50 is formed integrally with the metal forming the middle deck 42 to prevent the water jacket core from floating. Cylinder head, characterized in that. In the manufacturing process of the cylinder head, the process of injecting the metal solution with the water jacket core and the oil passage core interposed between the upper mold and the lower mold to form the water jacket and the oil passage provided in the cylinder head boss. To form a cylinder head, wherein the water jacket core 33 is prevented from being injured in the metal solution injection process to come into contact with the upper surface of the water jacket core and the oil passage core 34. Steel used in the manufacturing method of the cylinder head which performs the metal solution injection process after performing the steel insert member insert process which positions the separate steel insert member 50 in the middle between 33 and the oil passage core 34. In the insert member, A failure-shaped body 51 having flanges 52 and 53 extended on lower and upper sides, respectively; A water jacket seating groove (54) for guiding the body (51) to be seated on an upward protrusion (33a) of the water jacket core (33) protruding a predetermined section toward an upper portion; An oil passage seating groove 55 for allowing the body 51 to be seated on the downward protrusion 34a of the oil passage core 34 protruding a predetermined section toward the lower portion; Steel insert member used when manufacturing the cylinder head, characterized in that configured to include. The method of claim 3, wherein The water jacket seating groove (54) is a steel insert member used when manufacturing a cylinder head, characterized in that formed deeper than the depth of the oil passage seating groove (55). The method of claim 3, wherein The side cross-sectional shape of the water jacket seating groove (54) is a steel insert member used in the manufacture of a cylinder head, characterized in that the trapezoidal shape of the lower light. The method of claim 3, wherein The side cross-sectional shape of the oil passage seating groove (55) is a steel insert member used in the manufacture of a cylinder head, characterized in that the trapezoidal shape of ordinary light. The method of claim 3, wherein The surface of the body 51 which is in contact with the middle deck 42 of the cylinder head 40 is made of a cylinder head, characterized in that formed in a spiny pattern (S) of the splinter shape to improve the bonding strength of both members during casting Steel insert members used in construction. The method of claim 7, wherein Spine pattern (S) formed on the surface of the body 51 is a steel insert member used when manufacturing the cylinder head, characterized in that formed by the centrifugal casting method.

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