KR200412157Y1 - Mold set for cylinder head cover injection molding - Google Patents

Abstract

The present invention relates to a mold set for cylinder head cover injection molding. It is combined with each other to provide injection molding of the cylinder head cover mounted on the upper cylinder head of the engine to provide an inner space of the shape of the cylinder head cover, a core mold representing the shape of the cylinder head cover bottom surface during injection; A base mold having a through space through which the core mold passes through and having a groove forming protrusion formed on a top surface thereof and extending along an edge of the through space and forming a gasket groove formed at a lower end of the cylinder head cover; A cover mold mounted on the base mold and accommodating therein the core mold and the groove forming protrusion protruding from the base mold, and providing the inner space between the core mold and the base mold. It features.

The cylinder head cover injection molding die set of the present invention made as described above has a groove forming protrusion for precisely forming a gasket groove, so that the width and depth of the gasket groove in the injected cylinder head cover are constant. Accordingly, the pressure of the gasket groove to press the gasket is uniform, so that the cylinder head cover can minimize the leakage of oil or noise.

Description

Mold set for cylinder head cover injection molding}

1 is a perspective view showing a typical cylinder head cover.

FIG. 2 is a sectional view taken along the line II-II of the cylinder head cover shown in FIG.

3 is a configuration diagram of a conventional mold for manufacturing the cylinder head cover.

4 is a view showing a mold set according to an embodiment of the present invention for manufacturing a vehicle cylinder head cover.

FIG. 5 is a block diagram showing the combination of the mold set shown in FIG. 4 for use.

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

11: Cylinder head cover 13: Bolt hole

15: border part 17: gasket groove

19: Gasket 21: Ignition plug fitting

23: oil supply port 31: mold set

33: mold body 33a: groove forming protrusion

33b: Top 34: Machined groove

35: core mold 37: cover mold

51: mold set 53: base mold

53a: penetrating space 53b: groove forming protrusion

53c: top surface 53d: inward wall surface

It is supporter 55

Z: Inner Space

The present invention relates to a mold set for cylinder head cover injection molding.

The cylinder head cover mounted on the engine of the vehicle protects various elements, such as the rocker arm and rocker arm shaft and valve opening and closing mechanism, which are mounted inside the cylinder head with a gasket interposed between the cylinder head and further, It blocks the transmission of noise from the engine to the outside. The cylinder head cover has a wide variety of types depending on the model of the engine and is injection molded from aluminum or heat-resistant plastic.

1 illustrates a general cylinder head cover.

As shown, a plurality of bolt holes 13 are formed in the edge portion 15 of the cylinder head cover 11. The bolt hole 13 is a hole through which the fastening bolt (not shown) passes downward. The fastening bolts pass through the bolt holes 13 to be coupled to the female screw portions provided in the cylinder heads (not shown) to fix the cover 11 to the cylinder heads.

Reference numeral 21 denotes a spark plug fitting and reference numeral 23 denotes an oil supply port. The position, size or number (the number of the ignition plug fittings) of the spark plug fitting 21 or the oil lubrication opening 23 depends on the model of the engine.

On the other hand, with the cylinder head cover 11 mounted on the cylinder head, between the cylinder head cover 11 and the cylinder head so that oil or noise does not leak through the contact surface between the cylinder head and the cover 11. The gasket (19 in Fig. 2) is provided. Usually the gasket is made of acrylic rubber.

In order to install the gasket 19, a gasket groove (17 in FIG. 2) is provided on the bottom surface of the edge portion 15 of the cylinder head cover 11, that is, the surface closely contacting the cylinder head.

FIG. 2 is a sectional view taken along the line II-II of the cylinder head cover shown in FIG.

Referring to the drawings, it can be seen that the gasket groove 17 is formed on the bottom of the edge portion 15 of the cylinder head cover 11, and the gasket 19 is inserted into the gasket groove 17. . Of course, the size of the gasket groove 17 depends on the type of gasket to be used. In addition, the gasket 19 protrudes out of the gasket groove 17 to be compressed when the cylinder head cover 11 is mounted on the cylinder head cover 11 and maintains airtightness.

As is known, the gasket's airtightness is better as the compression force applied to the gasket becomes uniform throughout. For example, in a substantially rectangular closed loop gasket, if a portion of the compressive force is strong and the compressive force on the side is relatively weak, the oil must leak through the weak compressive region.

Since the compressive force is determined by the volume of the gasket groove 17, the more precisely the gasket groove 17 is processed, the more the compressive force becomes uniform and thus the gasket capacity is increased.

3 is a configuration diagram of a conventional mold for manufacturing the cylinder head cover.

As shown in the drawing, the conventional mold set 31 includes a core mold 35 in which the shape of the bottom surface of the cylinder head cover 11 is expressed, and a core mold 35 positioned below the core mold 35. Inner space between the core body 35 and the mold body 33, which is integrally formed on the top surface 33b and has a groove forming protrusion 33a formed on the top surface 33b. A cover mold 37 forming (Z) is included. Of course, the bottom surface of the cover mold 37 has the shape of the upper surface of the cylinder head cover 11 to be molded.

The core mold 35 and the groove forming protrusion 33a are formed through electric discharge machining. In other words, a block of metal is excavated in the shape designed from the top through the discharge machining to obtain the desired shape.

For reference, the electric discharge machining is effective for planar machining, but inefficient for machining very narrow grooves or forming holes. Of course, the grooves or holes can be processed, but the width or depth is not uniform, which does not guarantee the precision.

On the other hand, in order to form the groove forming projection (33a) through the above discharge processing method, while processing the flat upper surface (33b) it is necessary to excavate the processing groove 34 in the lower end of the outer wall of the core mold (35). The bottom surface of the processing groove 34 should have the same horizontal surface as the top surface 33b of the mold body 33, and the width of the bottom surface should of course be constant.

However, as described above, since the discharge machining does not precisely process narrow grooves due to processing characteristics, the width or depth of the processing groove 34 is slightly different in the case of the mold, and for example, the A portion that is hatched due to the discharge energy is weak. Can also be. When the processing groove 34 is unprocessed as described above, the gasket groove 17 of the injection molded head cover 11 becomes large so that the force for compressing the gasket 19 is weakened.

In addition, when the discharge energy is stronger than normal and overworked, the depth or width of the processing groove 34 becomes larger than the designed value, so that the gasket groove 17 is smaller and the gasket 19 does not protrude enough to the gasket groove 17.

As a result, the above-described conventional mold (produced through discharge processing) cannot form the precise gasket groove 17. As described above, when the size of the gasket groove 17 is not precise, a compressive force for pressing the gasket 19 is not uniform, and thus, leakage of oil or noise occurs.

The present invention has been made to solve the above problems, the groove forming projection to form a gasket groove is precisely made, the width or depth of the gasket groove in the injection cylinder head cover is so constant, accordingly the gasket groove gasket It is an object of the present invention to provide a mold set for injection molding of a cylinder head cover that minimizes leakage of oil or noise due to a uniform pressure for pressing.

In order to achieve the above object, the present invention is to provide an inner space of the cylinder head cover shape is combined with each other to injection molding the cylinder head cover mounted on the upper cylinder head of the engine, the shape of the cylinder head cover bottom surface during injection A core mold which represents; A base mold having a through space through which the core mold passes through and having a groove forming protrusion formed on a top surface thereof and extending along an edge of the through space and forming a gasket groove formed at a lower end of the cylinder head cover; A cover mold mounted on the base mold and accommodating therein the core mold and the groove forming protrusion protruding from the base mold, and providing the inner space between the core mold and the base mold. It features.

In addition, the core mold is manufactured separately from the base mold and can be attached to and detached from the base mold, and when mounted to the base mold, the core mold is fixed to the inward wall surface of the through space.

In addition, the inward wall surface of the through space is characterized in that it takes the form of the bottom opening so that the core mold can be pulled out from the base mold.

Hereinafter, one embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a view showing a mold set according to an embodiment of the present invention for producing a vehicle cylinder head cover, Figure 5 is a block diagram showing a combination of the mold set shown in Figure 4 for use to be.

The same reference numerals as the above reference numerals denote the same members having the same function.

Basically, the mold set 51 of the present invention comprises the core mold 35 detachably with respect to the base mold 53 on which the groove forming protrusion 53b is formed, thereby forming the groove forming protrusion 53b as the core mold. It is based on the viewpoint that it can process without obstructing (35), and can process the groove forming protrusion 53b with such precision.

In any case, referring to FIGS. 4 and 5, the mold set 51 according to the present embodiment has a predetermined thickness, and a through space 53a is provided at the center thereof, and an upper surface 53c of the mold set 51 has a predetermined thickness. Base mold 53 having a groove forming protrusion 53b extending along an edge portion, and through the through space 53a upwardly, as shown in FIG. A protruding core mold 35, a supporter 55 supporting the core mold 35, and a cover mold 37 covering an upper portion of the core mold 35 protruding upward from the base mold 53. It includes.

The through space 53a of the base mold 53 is formed by a wire cutting, laser cutting or water jet cutting method, and the inward wall surface 53d is in close contact with the outer wall surface of the core mold 35. It has a shape corresponding to the planar shape of (35). In particular, the inward wall surface 53d may be extended outward by an angle θ with respect to the vertical line VA. Preferred flaring angles are 0 degrees to 5 degrees.

The inward wall surface 53d is formed wide as described above, in order to easily insert and detach the core mold 35 into the through space 53a.

On the other hand, the groove forming projection (53b) is extended along the edge line at a predetermined distance from the upper end edge line (line where the inward wall surface 53d and the top surface 53c meets) of the inward wall surface 53d closed loop To achieve.

Only the upper surface 53c and the through space 53a of a predetermined width are present in the inner region of the groove forming protrusion 53, and there is no groove (the structure that prevents the processing of the groove forming protrusions) such as the core mold of FIG. The molding protrusion 53 is easy to process.

As described with reference to FIG. 3, in the conventional mold, since the core mold 35 is integrally fixed to the center of the upper surface of the mold body 33, the outer side of the core mold 35 is formed to form the groove forming protrusion 33a. Although it was not possible to satisfactorily form a groove having a precise width and depth at the bottom of the wall, in the present embodiment, only the top surface 53c of the base mold 53 needs to be shaved in order to process the groove forming protrusion 53b. The processing convenience of the groove forming protrusion 53b is very good, and thus the precision can be sufficiently increased.

If the precision of the groove forming protrusion 53b with respect to the upper surface 53c is good, it is a matter of course that the gasket groove 17 of the cylinder head cover 11 can be precisely molded.

Referring to FIG. 5, the core mold 35 passes upward through the through space 53a of the base mold 53, and an upper surface thereof protrudes from the base mold 53, and the cover mold 37 is the core mold 35. ) And the groove forming protrusion 53b are accommodated in the inner region thereof. The molten raw material for manufacturing the cylinder head cover is injected into the inner space Z provided by the cover mold 37 and the core mold 35.

The present invention has been described in detail through specific embodiments, but the present invention is not limited to the above embodiments, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. .

The cylinder head cover injection molding die set of the present invention made as described above has a groove forming protrusion for precisely forming a gasket groove, so that the width and depth of the gasket groove in the injected cylinder head cover are constant. Accordingly, the pressure of the gasket groove to press the gasket is uniform, so that the cylinder head cover can minimize the leakage of oil or noise.

Claims (3)

In order to injection molding the cylinder head cover mounted on the upper cylinder head of the engine to provide an internal space of the cylinder head cover shape, A core mold representing a shape of the bottom surface of the cylinder head cover during injection; A base mold having a through space through which the core mold passes through and having a groove forming protrusion formed on a top surface thereof and extending along an edge of the through space and forming a gasket groove formed at a lower end of the cylinder head cover; A cover mold mounted on the base mold and accommodating therein the core mold and the groove forming protrusion protruding from the base mold, and providing the inner space between the core mold and the base mold. A mold set for injection molding of a cylinder head cover. The method of claim 1, The core mold is manufactured separately from the base mold and is detachable from the base mold, and when mounted to the base mold, the cylinder head cover injection molding mold set is fixed to the inward wall surface of the through space. The method of claim 2, The inward wall surface of the through space is a cylinder head cover injection molding mold set, characterized in that it takes the form of the bottom opening so that the core mold can be pulled out from the base mold to the bottom.

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