JP3280198B2 - Molding device for molding a core for a cylinder block of a multi-cylinder internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus for molding a core for a cylinder block of a multi-cylinder internal combustion engine, and more particularly, to a multi-cylinder cylinder forming part at an upper part and a crank chamber forming part at a lower part. The present invention relates to a mold apparatus for performing molding by integrally wrapping a core for a cylinder block of a multi-cylinder internal combustion engine, which has a core corresponding to an intermediate bearing, which is separately molded in advance.

[0002]

2. Description of the Related Art Conventionally, when molding a core for a cylinder block of a multi-cylinder internal combustion engine, in order to secure the accuracy of the core,
Holding the core of the pre-molded intermediate bearing equivalent part on the model,
A method has been developed in which a core for a cylinder block is completed by molding the core so as to wrap the core integrally.

[0003]

However, there have been proposed one or two mold apparatuses for molding a core having a complicated shape through a multi-step process while ensuring accuracy. However, there was a problem that it became very complicated and expensive.
The present invention has been made to solve the above problems,
An object of the present invention is to provide a mold device that can accurately mold a core for a cylinder block of a multi-cylinder internal combustion engine and has a simple structure.

[0004]

In order to achieve the above-mentioned object, a core molding apparatus according to the present invention has a multi-cylinder cylinder forming section at an upper portion and a crank chamber forming section at a lower portion. The core for the cylinder block of the cylinder internal combustion engine
The intermediate bearing portion corresponding tang previously been separately molding a mold apparatus for molding so as to have wrapped together, have the intermediate bearing portion corresponding core insertion cavity on the top surface, the cavity surface
The projection for fixing and positioning the core corresponding to the intermediate bearing
A lower die provided with a plurality of parts and a core extrusion pin provided so as to be able to ascend and descend, a pair of vise types disposed above and below the lower die so as to be openable and closable, and opposed to each other above the lower die. A pair of loose pieces arranged so as to be openable and closable in a direction perpendicular to the opening and closing direction of the vise type, and an upper mold arranged to be able to ascend and descend above the vise type and the loose piece. It is characterized by having done.

[0005]

The above structure is such that the upper die is raised, the vise die and the loose piece are opened, and the core extrusion pin is lowered in the state where the core extrusion pin is further lowered. To insert the protrusion into the recess
Then, the lower mold is set in a predetermined core insertion space, then the vise mold and the loose piece are closed, and the upper mold is further lowered to define a desired core molding cavity, By filling the cavity with a predetermined molding sand and hardening, a desired core can be formed.

[0006]

1 to 7 show an embodiment of the present invention.
This will be described in detail based on FIG. A molding device for molding a core C for a cylinder block of a multi-cylinder internal combustion engine shown in FIG.
As shown in FIG. 1, when a main part is represented in an exploded perspective view, a lower die 1 having an intermediate bearing equivalent part core insertion space 1 a on the upper surface and a core extrusion pin 2 provided so as to be able to move up and down, This lower mold 1
And a pair of vise dies 3a and 3b arranged to be openable and closable opposite to each other above and below the lower die 1. The pair of vise dies 3a and 3b are opposed to each other right and left above the lower die 1 and are orthogonal to the opening and closing direction of the vise dies 3a and 3b. It comprises a pair of loose pieces 4a, 4b arranged to be openable and closable in the left-right direction, and an upper mold 5 arranged to be able to ascend and descend above the vise dies 3a, 3b and the loose pieces 4a, 4b. It is.

On the surface of the lower mold cavity 1a, there are provided a plurality of projections 1b for fixing and positioning the core corresponding to the intermediate bearing, and the core push-out pin 2 is provided on the upper surface of the push-out plate 6. It is stuck. The upper die 5 is raised and lowered by conventional means (not shown), and is configured to be able to reciprocate backward after being raised. A plurality of downwardly extending mandrels 5a are fixedly provided on the lower surface. Hole 5b
Are transparently provided above and below. The mold device can be automatically opened and closed as shown in FIGS. 2 to 4 which are a front view, a plan view excluding the upper mold 5, and a partially sectional left side view.

That is, as shown in FIG. 2, the lower die 1 is attached to the upper surface of the fixed die base 7, and the frame 8 is further mounted on the fixed die base 7 by the lower die 1, the vise die 3 a, 3b and the loose pieces 4a, 4b. Then, as shown in FIG. 3, the vise dies 3a, 3b and the loose pieces 4a, 4b
Are two pairs of horizontal cylinders 9a mounted on the frame 8,
The movable die bases 11a, 11b and 12a and 12b are respectively attached to the distal ends of the piston rods 9b and 10a and 10b via the movable die bases 11a, 11b and 12a and 12b.
Four guide bars 15 slidably penetrating the frame 8 via holders 13a, 13b, 14a and 14b.
a, 15b and 16a, 16b, respectively.

In the above-mentioned structure, the upper die 5 is raised and then retracted backward, the vise dies 3a and 3b and the loose pieces 4a and 4b are opened, and the core push-out pin 2 and the push-out plate 6 are further lowered. Under this state, a pair of preformed intermediate core core pieces P shown in FIG. 6 are bonded together to form an intermediate bearing equivalent core W as shown in FIG.
Subsequently, a plurality of the cores W corresponding to the intermediate bearings are set in the hollows 1a for inserting the cores so that the projections 1b are inserted into the recesses 20 thereof. Next, the two pairs of lateral cylinders 9a, 9b and 10a, 10b are extended to operate to close the vise molds 3a, 3b and the loose pieces 4a, 4b, and then the upper mold 5 is moved to the vise molds 3a, 3b and the loose pieces 4a, After moving forward to the position just above 4b, it is lowered to define a desired core molding cavity, and then this cavity is filled with predetermined molding sand by an appropriate conventional means.

Next, the filled molding sand is hardened by a conventional method, and after the hardening of the molding sand, as shown in FIG.
The vise dies 3a, 3b and the loose pieces 4a, 4b are opened by contracting the a, 9b and 10a, 10b, and then the push pin 2 and the push plate 6 are raised by conventional means. As a result, a desired cylinder block core C obtained by integrally assembling a plurality of the cores W corresponding to the intermediate bearings can be obtained.

[0011]

Obviously the present invention from the above description has intermediate bearing-corresponding portion core insertion cavity on the top surface, the
The core of the part corresponding to the intermediate bearing is fixed and positioned on the surface of the empty space 1a.
A lower die having a plurality of protrusions 1b to be provided and a core extrusion pin provided so as to be able to move up and down; a pair of vise dies disposed above and below the lower die so as to be openable and closable; And a pair of loose pieces arranged to be openable and closable in a direction orthogonal to the opening and closing direction of the vise type, and an upper die arranged to be able to move up and down above the vise type and the loose piece. Thus, the core for the cylinder block of the multi-cylinder internal combustion engine can be accurately molded, and further, excellent effects such as a simple structure can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of an embodiment of the present invention.

FIG. 2 is a partially sectional front view showing an embodiment of the present invention.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a perspective view of a cylinder block core formed by the mold apparatus of the present invention.

FIG. 6 is a perspective view of a pair of core pieces corresponding to intermediate bearings.

FIG. 7 is an operation view according to a cross section taken along line BB of FIG. 2, showing an operation state in which a core for a cylinder block is pushed up by an extrusion pin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower die 1a Intermediate bearing equivalent part core insertion space 2 Core extrusion pin 3a, 3b Vise type 4a, 4b Loose piece 5 Upper die

Claims (1)

(57) [Claims] 1. A cylinder block core of a multi-cylinder internal combustion engine having a multi-cylinder cylinder molding portion at an upper portion and a crank chamber molding portion at a lower portion, and an intermediate bearing equivalent portion core separately molded in advance. A mold device for performing molding by wrapping and holding, having an intermediate bearing equivalent part core insertion cavity 1a on an upper surface,
The core corresponding to the intermediate bearing is fixed on the surface of the space 1a.
A plurality of protrusions 1b to be determined and a core pushing pin 2
And a pair of vise dies 3a and 3b disposed above and below the lower die 1 so as to be openable and closable. Vise type 3
a, a pair of loose pieces 4a, 4b arranged so as to be openable and closable in a direction orthogonal to the opening and closing directions of the a, 3b, the vise dies 3a, 3b and the loose pieces 4a,
An upper mold 5 movably disposed above and below 4b. A molding apparatus for molding a core for a cylinder block of a multi-cylinder internal combustion engine.