JP2000033459A - Cylinder head casting mold apparatus and casting core mounting method - Google Patents

Abstract

(57) [Problem] To provide a mold device for casting a cylinder head and a method of mounting a casting core capable of casting such that a surface of the cylinder head that contacts a cylinder block is substantially vertical. I do. A skirting board engaging recess formed in a lower slide die.
The lower casting core 38 is mounted on the sliding lower die 26 by engaging the skirting portion 40 of the lower casting core 38 with 6. Next, the reference surfaces 80a, 80b of the upper casting core 54 are brought into contact with the reference seating surfaces 64a, 64b of the sliding side dies 30a, 30b, so that the upper casting is performed between the sliding side dies 30a, 30b. The upper mold core 54 is supported by the sliding molds 30a and 30b. When the upper sliding mold 28 is moved closer to the lower sliding mold 26, and the movable mold 24 is moved closer to the fixed mold 22 to clamp the mold, and the molten metal is introduced, the surface of the cylinder head that comes into contact with the cylinder block is substantially vertically oriented. Casting is performed to become.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting mold apparatus for molding a cylinder head of an internal combustion engine and a method of mounting a casting core on a cylinder head.

[0002]

2. Description of the Related Art Conventionally, a cylinder head of an internal combustion engine has been cast using an intake port core and an exhaust port core formed by solidifying a material such as sand, and these cores are mounted on a mold. The cylinder head is cast by introducing molten metal into a mold.

For example, as shown in FIG. 5, a casting mold apparatus 1 of this type comprises a lower mold 2 and an upper mold 3 which can be separated from each other.
And the combustion chamber forming part 4 is attached to the lower mold 2. One end of an intake port core 5 and an exhaust port core 6, which are casting cores, are attached to the combustion chamber forming section 4, and the other ends of the intake port core 5 and the exhaust port core 6 are connected to a pair of sides. By engaging the molds 7a and 7b, the intake port core 5 and the exhaust port core 6 can be easily mounted on the casting mold apparatus 1.

[0004]

However, in the conventional cylinder head casting mold apparatus 1 described above, the surface of the cylinder head to be cast which comes into contact with the cylinder block is substantially horizontal, and this surface is substantially vertical. So that the direction
When one side mold 7a is arranged below, the other side mold 7b is arranged above, and the lower mold 2 and the upper mold 3 are arranged laterally, the intake port core 5 is arranged laterally with the lower mold 7a. Although it can be easily mounted between the lower die 2 and the combustion chamber forming part 4, the exhaust port core 6 has a side die 7b that holds the upper end of the lower die 2.
, And it is extremely difficult to mount and hold between the combustion chamber forming part 4 and the side mold 7b.

Therefore, an exhaust port core 6a having a substantially L-shaped cross section is prepared as in a casting mold apparatus 8 shown in FIG. 6, and one end of the exhaust port core 6a disposed on the upper portion is formed. It is conceivable that it is mounted on the combustion chamber forming section 4 and the other end is mounted on and held by the mold 9 in an upright state. Since the production efficiency is improved when the intake port core 5a provided at the lower portion is formed with the same mold as the exhaust port core 6a, the intake port core 5a is also formed in the same shape as the exhaust port core 6a. It is mounted on the mold 9 and held.

However, with this configuration, a part of the outer wall surface of the cylinder head to be cast is cast by a part of the intake port core 5a and the exhaust port core 6a made of a material such as sand. And there is a disadvantage that the dimensional accuracy at this portion is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a cylinder head casting mold capable of casting such that the surface of the cylinder head that contacts the cylinder block is substantially vertical. It is an object of the present invention to provide an apparatus and a method for mounting a casting core.

[0008]

In order to achieve the above object, the present invention provides a stationary die for casting an engine cylinder head, a sliding lower die, a sliding upper die and a pair of sliding sides. And a movable mold having a mold, wherein one end is connected by a skirting portion that engages with an engagement portion formed on the sliding lower mold, and the other end is the fixed mold. A lower casting core constituting a plurality of intake / exhaust port forming portions engaging with the engaging portions formed in the sliding portion, and a skirting portion engaging with the engaging portions formed on the sliding upper die. One end is connected and both ends of the baseboard are bridged by the pair of sliding-side molds, and the other end engages with an engaging portion formed on the fixed mold. An upper casting core constituting an exhaust port forming portion, and the upper cylinder is in contact with the cylinder block. Cavity constituting the combustion chamber so that the surface of the soil is substantially vertical direction, characterized in that it is formed in the fixed mold and the movable mold.

According to the present invention, the upper casting core can be supported by the pair of sliding-side dies, and the mold is configured so that the surface of the cylinder head that contacts the cylinder block is substantially vertical. be able to.

Further, the present invention provides a casting mold apparatus including a fixed mold for casting a cylinder head of an engine, and a movable mold having a sliding lower mold, a sliding upper mold and a pair of sliding molds. A method for mounting a casting core on a lower casting core, wherein a baseboard part of a lower casting core connecting a plurality of suction / exhaust port forming parts is engaged with an engaging part formed on the sliding lower die. The step of mounting one end of the lower casting core on the lower sliding die, and the skirting board formed on the upper casting core connecting the plurality of other suction / exhaust port forming portions. Bridging the part to the pair of sliding-side molds to attach one end of the upper casting core to the sliding-side mold; and forming the lower casting core and the upper casting core. Attaching the other end to the fixed mold.

According to the present invention, the upper casting core can be supported by the pair of sliding side dies, and the casting can be performed such that the surface of the cylinder head in contact with the cylinder block is vertical.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method for mounting a core for casting a cylinder head according to the present invention will be described with reference to the accompanying drawings. This will be described in detail below.

First, the cylinder head 10 cast in this embodiment will be described.

As shown in FIG. 1, the cylinder head 10 has a surface 12 which contacts a cylinder block (not shown).
A plurality of combustion chambers 14 are formed, and the combustion chamber 14 communicates with a plurality of ports 16 used for air supply and exhaust. Each port 16 bifurcates on the combustion chamber 14 side.

Next, a casting mold apparatus 20 for casting the cylinder head 10 will be described with reference to FIGS.

The casting mold apparatus 20 includes a stationary mold 22
And a movable mold 24 that can approach and separate from the fixed mold 22 in the direction of arrow A. Main body 25 constituting movable mold 24
Has a sliding lower die 2 that can be displaced in the vertical direction (the direction of arrow B).
6 and a sliding upper die 2 that can be moved toward and away from the sliding lower die 26.
8 and a pair of sliding side dies 30a and 30b slidable in the side direction (the direction of arrow C) are slidably mounted. Fixed type 2
2. A cavity 32 is formed by the main body 25, the lower sliding mold 26, the upper sliding mold 28, and the sliding molds 30a and 30b. The cavity 32 has the shape of the cylinder head 10 to be cast, and the surface 34 forming the surface 12 of the cylinder head 10 is substantially vertical.

A skirting board engaging concave portion (engaging portion) is provided on the sliding lower mold 26.
A baseboard portion 40 formed on the lower casting core 38 is engaged with the baseboard engaging recess 36. A positioning projection 42 is formed on the bottom of the baseboard engaging recess 36, and the positioning projection 42 engages with a positioning recess 44 formed on the baseboard section 40. A plurality of positioning recesses 46 are formed at the bottom of the baseboard engaging recess 36, and positioning projections 48 formed on the baseboard portion 40 are engaged with the positioning recesses 46. In the lower casting core 38, a plurality of port forming portions 50 are erected on the baseboard portion 40, and the port forming portions 50 are provided.
Is formed in two forks.

The fixed mold 22 is provided with a combustion chamber forming portion 52 corresponding to the shape of the combustion chamber 14 of the cylinder head 10.
An engagement portion 58 is formed in the combustion chamber forming portion 52 so that the distal end portions of the port forming portions 50 and 56 of the lower casting core 38 and the upper casting core 54 engage.

A plurality of valve guide blanking pins 60 are inserted into the main body 25 at a predetermined angle so as to be displaceable, and the end portions of the valve guide blanking pins 60 are connected to the lower casting core 38 and the upper casting body. Abuts on the port forming portions 50 and 56 of the child 54.

The upper portions of the sliding side dies 30a and 30b are formed with concave portions 62a and 62b with which the upper sliding die 28 is engaged. Protrusions 63a, 63 are formed at the bottoms forming the recesses 62a, 62b.
b is formed, and the upper surfaces of the protrusions 63a and 63b are formed as flat reference seat surfaces 64a and 64b. An extruded pin 66 is provided on one of the sliding side dies 30b so as to be displaceable, and the extruded pin 66 is formed so as to gradually decrease its diameter toward its tip.

In the lower portion of the upper sliding die 28, there are provided concave portions 62a, 62
b are formed so as to engage with the protrusion 68a.
A baseboard engaging recess (engaging section) 72 with which the baseboard section 70 of the upper casting core 54 can be engaged is formed between a and the projection 68b. A positioning projection 74 is formed on the bottom portion forming the skirting board engaging recess 72, and the positioning projection 74 is
Is engaged with the positioning recessed portion 75 formed at the bottom. Further, a plurality of positioning recesses 76 are formed at the bottom of the baseboard engaging recess 72, and positioning projections 78 formed on the baseboard 70 are engaged with the positioning recesses 76.

At the lower part of the skirting portion 70 of the upper casting core 54, the upper casting core 5 is brought into contact with the reference seating surfaces 64a, 64b.
Reference surfaces 80a and 80b for positioning the position 4 are formed.

The casting mold apparatus 20 according to the present embodiment
Is basically configured as described above. Next, the operation of the casting mold apparatus 20 will be described in relation to the method of mounting the casting core of the cylinder head of the present embodiment. explain.

First, the movable mold 24 is separated from the fixed mold 22. Further, the lower sliding die 26 is set at the position shown in FIG. 3 with respect to the main body 25 of the movable die 24, and the upper sliding die 28 is separated from the sliding die 30a, 30b.
The sliding-side molds 30a and 30b are also opened in the lateral direction. From this state, the lower casting core 38 formed by solidifying a material such as sand is attached to the sliding lower mold 26.
In this case, the skirting portion 40 of the lower casting core 38 engages with the skirting engagement recess 36 of the lower sliding die 26. The positioning projections 42 engage with the positioning recesses 44, and the positioning projections 48 engage with the positioning recesses 46, thereby positioning the lower casting core 38.

Next, the sliding molds 30a and 30b are moved closer to each other. Next, the upper casting core 54 formed by solidifying a material such as sand is attached to the sliding side molds 30a and 30b. At this time, the reference surfaces 80a, 80b of the skirting portion 70 are brought into contact with the reference seat surfaces 64a, 64b, and the upper casting core 54
Are positioned with respect to the sliding molds 30a and 30b. For this reason, the upper casting core 54 is bridged and supported between the sliding side dies 30a and 30b. Next, one sliding side mold 3
The cast pin 66 is inserted into 0b.

Next, when the upper sliding mold 28 is displaced in the direction of arrow B to approach the lower sliding mold 26,
The skirting part 70 of the upper casting core 54 is engaged with the upper casting core 54. Also,
The positioning projection 74 engages with the positioning recess 75, and the positioning projection 78 engages with the positioning recess 76, and the upper casting core 54 is positioned with respect to the upper sliding die 28.

Next, the movable mold 24 is displaced in the direction of arrow A to approach the fixed mold 22 and clamp the mold.
The leading ends of 0 and 56 are engaged with engaging portions 58 formed on the combustion chamber forming portion 52 of the fixed mold 22. When the valve guide blanking pin 60 is displaced toward the inside of the cavity 32, the end of the valve guide blanking pin 60 is connected to the lower molding core 38 and the port molding portion 5 of the upper casting core 54.
Abuts 0,56.

Thus, the casting mold apparatus 20 is clamped.

Then, a molten metal such as aluminum is introduced into the interior of the cavity 32 from a gate (not shown), and casting is performed. When the temperature of the molten metal is lowered and solidified, the cylinder head 10 is formed. Surface 1 of cylinder head 10 cast in this way, which is in contact with cylinder block
2 is substantially vertical.

Next, the movable mold 24 is displaced in the direction away from the fixed mold 22, and the sliding lower mold 26, the sliding upper mold 28 and the sliding side mold 28 are moved relative to the main body 25 of the movable mold 24. The cylinder head 10 is taken out by displacing the molds 30a and 30b in a direction away from each other and opening the mold. At this time,
A lower casting core 38 and an upper casting core 54 are mounted on the cylinder head 10. Therefore, when the cylinder head 10 is subjected to a process such as shot blasting, the lower casting core 38 and the upper casting core 54 formed by solidifying a material such as sand collapse and are removed.

The cylinder head 10 is cast as described above.

[0032]

According to the cylinder head casting mold apparatus and the casting core mounting method of the present invention, the following effects and advantages can be obtained.

The lower casting core is mounted by engaging a baseboard portion with an engaging portion formed on the sliding lower die.
Since the upper casting core is supported by bridging the pair of sliding molds, there is no fear that the upper casting core will be damaged when the movable mold approaches the fixed mold. Therefore, the mold can be configured so that the surface of the cylinder head that comes into contact with the cylinder block is substantially vertical without lowering the dimensional accuracy of the cylinder head.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a cylinder head according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a mold device for casting a cylinder head according to an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of the casting mold apparatus shown in FIG. 2;

FIG. 4 is a sectional view of the casting mold apparatus shown in FIG. 2, taken along the line IV-IV.

FIG. 5 is a longitudinal sectional view showing a cylinder head casting mold apparatus according to the related art.

FIG. 6 is a longitudinal sectional view showing a mold apparatus for casting a cylinder head according to another related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Cylinder head 14 ... Combustion chamber 20 ... Casting mold apparatus 22 ... Fixed mold 24 ... Movable mold 26 ... Sliding lower mold 28 ... Sliding upper mold 30a, 30b ... Sliding side mold 32 ... Cavity 36, 72 ... Baseboard engaging recess 38 ... Lower casting core 42, 70 ... Baseboard part 50, 56 ... Port forming part 54 ... Upper casting core 64a, 64b ... Reference seat surface 80a, 80b ... Reference surface

Claims (2)

[Claims] 1. A casting mold apparatus comprising: a fixed mold for casting a cylinder head of an engine; and a movable mold having a sliding lower mold, a sliding upper mold and a pair of sliding molds. A plurality of intake / exhaust ports, one end of which is connected by a skirting board that engages with an engaging portion formed on the movable die, and the other end of which engages with the engaging portion formed on the fixed die. A lower casting core constituting a molding portion, and one end portion is connected by a skirting portion that engages with an engaging portion formed on the sliding upper die, and both ends of the skirting portion are paired with each other. An upper casting core constituting another plurality of suction / exhaust port molding portions, the other end of which is bridged to the sliding side mold, and the other end of which engages with the engagement portion formed on the fixed mold. A cylinder that constitutes a combustion chamber such that the surface of the cylinder head that contacts the cylinder block is substantially vertical. Casting mold system of the cylinder head, characterized in that tee is formed in the fixed mold and the movable mold. 2. A casting mold apparatus comprising: a fixed mold for casting a cylinder head of an engine; and a movable mold having a sliding lower mold, a sliding upper mold and a pair of sliding molds. A method of mounting a core, by engaging a skirting part of a lower casting core connecting a plurality of suction and exhaust port molding parts to an engagement part formed in the sliding lower mold, Attaching one end of the lower casting core to the sliding lower die; and forming the pair of baseboard portions formed on the upper casting core connecting a plurality of other suction / exhaust port molding portions. A step of attaching one end of the upper casting core to the sliding mold by bridging the sliding mold of the above, and the other end of the lower casting core and the upper casting core. A method for mounting a casting core of a cylinder head, comprising: mounting the core on a fixed die.