JPH01258858A - Casting device for cylinder block - Google Patents

Abstract

PURPOSE:To facilitate deflashing and coating of a parting material by mounting a die for molding a water jacket to the upper die of a casting device and advancing and retreating an insert pin for mounting a sleeve independently from the die. CONSTITUTION:The die 11 for molding a water jacket which is hung by a holding block 10 is fixed to the rear surface of the upper did 4 of the cylinder block casting device. The insert pin 12 is inserted into the space enclosed by the die 11 so as to come into sliding contact with a thick part 11a of the die 11. The sleeve 13 is mounted onto the outside circumference of the insert pin 12 and right and left middle dies 3, 4 and the upper die 4 are clamped. A molten metal is packed into a cavity 2 in the state of lowering the insert pin 12 to the lowermost position. The air intruding in the cavity 2 or between the insert pin 12 and the sleeve 13 is discharged through a V-groove 17 formed to the insert pin 12. The die life is thereby improved and the quality around the sleeve is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for casting cylinder blocks for engines such as automobiles.

(Prior art) A casting device that molds a water jacket for water cooling and also casts a sleeve on which a piston slides when casting an oven deck type cylinder block is known as Japanese Patent Application Laid-Open No. 59-232654. ing.

Such conventional casting equipment generally consists of a lower mold as a fixed mold, an intermediate mold that defines a cavity for molding the cylinder block, and an upper mold as a movable mold. The jacket molding mold and the insert pin for attaching the sleeve are installed.

(Problem N to be solved by the invention) In the conventional casting apparatus described above, both the water jacket molding mold and the insert pin are fixed to the upper mold, and the insert pin and the water jacket molding mold are both fixed to the upper mold. Because the gap between the insert pin and the mold is narrow, it is extremely difficult to clean the outer circumferential surface of the insert pin and the inner circumferential surface of the mold, such as removing deburrs, or to apply a mold release agent, which can shorten the life of the mold and This causes poor quality.

(Means for Solving the Problems) In order to solve the above problems, the present invention attaches a water jacket molding mold to the upper mold of a cylinder block casting machine,
The insert pin for attaching the sleeve was designed to move forward and backward (up and down) independently with respect to the mold.

(Function) With the insert pin retracted (raised) relative to the water jacket mold, the outer peripheral surface of the insert pin and the surface of the mold are cleaned and a release agent is applied.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a cross-sectional view of the casting device according to the present invention in a mold-clamped state;
FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a sectional view similar to FIG. 1 in an open state.

The casting device has an intermediate mold 3.3 which defines a cavity 2 for cylinder block molding and can move eight times in the horizontal direction on a lower mold 1 as a fixed mold, and is movable up and down above the intermediate mold 3. An upper mold 4 is provided as a movable mold. The lower mold 1 is provided with a cylindrical body 5, and a plunger 6 for pressurization is installed inside the cylindrical body 5.
The molten metal 7 of aluminum alloy or the like pressurized by the plunger 6 is sent into the cavity 2 through the runner 8, and is further surrounded by the runner 8 on the upper surface of the lower mold 1. A core 9 for forming the crankshaft housing portion between the intermediate mold 3 and the intermediate mold 3 is set in the part where the crankshaft is accommodated.

In addition, a water jacket molding mold 11 hanging downward is fixed to the lower surface of the upper mold 4 by a holding block 10, and an insert pin 12 is inserted from above into the space surrounded by this mold 11 by inserting the insert pin 12 into the space surrounded by the mold 11. It is inserted so as to be in sliding contact with the portion 11a.

The insert pin 12 is used to position and set a cast iron sleeve 13, which is filled with molten metal during casting, in the cavity 2. In the present invention, the insert pin 12 is connected to the upper die 4 by a cylinder unit (not shown). It is connected via a rod 15 to an ejector plate 14 that moves up and down independently, and the lowering limit of the ejector plate 14 is regulated by a stopper 16 provided on the upper surface of the upper mold 4. A large number of grooves 17 for gas venting are formed in the mutual direction, and the insert pin 1
2 is the lowest position with respect to the mold 11, the upper end of the V-groove 17 is connected to the large diameter recess 18 formed in the upper part of the mold 11.
It is arranged above the lower end, and a passage 19 for degassing is opened in the large diameter recessed part 18.

In the above, the sleeve 1 is attached to the outer periphery of the insert pin 12.
3, the left and right intermediate molds 3.3 and upper mold 4 are clamped, and the insert pin 12 is lowered to the lowest position (
1 and 2), the plunger 6 pressurizes and fills the cavity 2 with molten metal 7. At this time, even if air is present in the cavity 2 or between the insert pin 12 and the sleeve 13, this air is easily discharged to the outside via the V groove 17 formed in the insert pin 12.

When the molten metal 7 is solidified after being held for a predetermined time, the intermediate mold 3.3 is opened horizontally as shown in FIG. 3, the upper mold 4 is raised, and the cylinder block is ejected. is raised, and the insert pin 12 is raised relative to the mold 11. In this state, the inner peripheral surface of the mold 11 and the outer peripheral surface of the insert pin 12 are cleaned, and a mold release agent is applied to prepare for the next casting. .

(Effects of the Invention) As explained above, according to the present invention, the insert pin for attaching the sleeve can be moved forward and backward relative to the mold for molding the water jacket. Application of the mold agent is extremely easy, resulting in a longer mold life and improved quality around the sleeve.

Furthermore, by forming a groove on the insert pin, gas can be reliably vented during casting, further improving quality.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the casting device according to the present invention in a mold-clamped state;
FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a sectional view similar to FIG. 1 in an open state. In the drawing, 2 is a cavity, 4 is an upper mold, 11 is a water jacket mold, 12 is an insert pin, and 13 is a mold for molding a water jacket.
1 is a sleeve, and 17 is a gas vent groove. Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Part 2 1) Part 1 Patent Attorney
Kuni Ohashi Patent Attorney Small
Yama Yes procedural amendment (method)

Claims (2)

[Claims] (1) In a cylinder block casting apparatus equipped with a water jacket molding die and an insert pin for attaching a sleeve for a casting, the water jacket forming die is attached to the upper die of the casting apparatus, and the insert pin is attached to the casting apparatus. A cylinder block casting device characterized in that the pin is movable forward and backward within a space surrounded by a water jacket molding die. (2) The cylinder block casting apparatus according to claim 1, wherein a gas venting groove is provided in the upper part of the insert pin.