JPH064184B2 - Cylinder block casting equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for casting a cylinder block for an engine such as an automobile.

(Prior Art) When casting an oven deck type cylinder block, a casting apparatus for casting a water jacket for water cooling and surrounding a sleeve with which a piston slides is known as JP-A-59-232654. ing.

Such a conventional casting apparatus is generally composed of a lower mold as a solid mold, an intermediate mold defining a cavity for forming a cylinder block, and an upper mold as a movable mold. Insert pins for mounting the jacket mold and sleeve are attached.

(Problems to be Solved by the Invention) In the above-described conventional casting apparatus, both the water jacket molding die and the insert pin are fixed to the upper die, and the insert pin and the water jacket molding die are Since the gap between them is narrow, it is extremely difficult to clean the outer peripheral surface of the insert pin and the inner peripheral surface of the mold by deburring or to apply a mold release agent. It is the cause of defects.

(Means for Solving the Problem) In order to solve the above-mentioned problems, the present invention provides an insert pin for mounting and supporting a sleeve for cast gurney on an upper die of a cylinder block casting device, and a water jacket molding metal surrounding the insert pin A mold is provided, and this insert pin
The space surrounded by the water jacket molding die is slidable along the sliding surface of the water jacket molding die so that the space can be moved forward and backward (movable up and down). Further, a gas vent groove is provided on the outer peripheral surface of the insert pin that is in sliding contact with the sliding surface.

(Operation) Cleaning of the mold surface and the release agent by making the insert pin slidable with respect to the water jacket molding die and allowing it to move back and forth in the space surrounded by the water jacket molding die When applying, the insert pin should be moved forwards and backwards (raised).

Further, by providing the gas vent groove on the outer peripheral surface of the insert pin that is in sliding contact with the sliding surface of the mold, the gas in the cavities is efficiently discharged.

(Example) Below, the Example of this invention is described based on an accompanying drawing.

FIG. 1 is a sectional view of a casting apparatus according to the present invention in a mold clamped state,
2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view similar to FIG. 1 in the mold open state.

The casting apparatus defines a cavity 2 for forming a cylinder block on a lower die 1 as a fixed die, and arranges intermediate dies 3 and 3 which are movable in a horizontal direction, and is movable up and down above the intermediate die 3. An upper mold 4 as a mold is provided. The lower mold 1 is provided with a tubular body 5, and a pressurizing blanker 6 is provided in the tubular body 5.
Is slidably arranged so that the molten metal 7 such as an aluminum alloy pressurized by the plunger 6 is fed into the cavities 2 through the runner 8, and is surrounded by the runner 8 on the upper surface of the lower mold 1. A core 9 for molding a crankshaft accommodating portion with the intermediate mold 3 is set in the portion to be formed.

In addition, a water jacket molding die 11 that hangs downward is fixed to the lower surface of the upper die 4 by a holding block 10, and an insert bin 12 is inserted into the space surrounded by the die 11 from above to increase the wall thickness of the die 11. Sliding surface s of part 11a
It is inserted so that it will be in sliding contact with.

The insert pin 12 is for positioning and setting a cast iron sleeve 13 that is cast by a molten metal in the cavity 2 during casting. In the present invention, the insert pin 12 is different from the upper mold 4 by a cylinder unit (not shown). The ejector plate 14 which moves up and down independently is connected via a rod 15, and the lower limit of the ejector plate 14 is regulated by a stopper 16 provided on the upper surface of the upper die 4. A large number of V grooves 17 for degassing are formed in the axial direction, and the insert bin 1
At the position where 2 is most lowered with respect to the mold 11, the upper end of the V groove 17 has a large-diameter recess 18 formed in the upper part of the mold 11.
A passage 19 for venting gas is opened in the large-diameter recess 18 so as to be above the lower end.

In the above, the sleeve 1 is attached to the outer periphery of the insert bin 12.
3, the left and right intermediate dies 3 and 3 and the upper die 4 are clamped, and the insert pin 12 is lowered to the lowest position (the state shown in FIGS. 1 and 2).
The molten metal 7 is pressurized and filled in the cavities 2.
At this time, the insert pin 12 or the cavody 2
Even if air enters between the sleeve 13 and the sleeve 13, this air is easily discharged to the outside through the V groove 17 formed in the insert pin 12.

When the molten metal 7 is solidified by holding for a predetermined time, the intermediate dies 3 and 3 are opened in the horizontal direction as shown in FIG. 3, the upper die 4 is raised, and the cylinder block is discharged. Further, the ejector plate 14 is raised to raise the insert pin 12 with respect to the die 11, and in this state, the inner peripheral surface of the die 11 and the surface of the inner part r (see FIG. 3) of the die 11 are cleaned, A release agent is applied to prepare for the next casting.

(Effects of the Invention) According to the present invention as described above, since the insert pin for mounting the sleeve can be moved forward and backward relative to the mold for forming the water jacket, cleaning and separation such as deburring and the like can be performed. The mold agent can be applied very easily, and as a result, the life of the mold is extended and the quality around the sleeve is improved.
Further, by forming a groove in the insert pin, it is possible to reliably perform degassing during casting, and further improve quality.

[Brief description of drawings]

FIG. 1 is a sectional view of a casting apparatus according to the present invention in a mold clamped state,
2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view similar to FIG. 1 in the mold open state. In the drawings, 2 is a cavity, 4 is an upper die, 11 is a water jacket molding die, 12 is an insert pin, 13
Is a sleeve, and 17 is a gas vent groove.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taichi Mitsuo 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Within Honda Engineering Co., Ltd. (56) Reference JP-A-61-232053 (JP, A) JP 61-219458 (JP, A) JP 62-161457 (JP, A) Actually developed 62-56267 (JP, U)

Claims (1)

[Claims] 1. An upper die is provided with an insert pin for mounting and supporting a sleeve for cast iron and a water jacket molding die surrounding the insert pin, and between the upper die and the other die of the cylinder block. In a casting device for a cylinder block configured to form a cavity, the insert pin is slidable along a sliding surface of a water jacket molding die, and a space surrounded by the water jacket molding die is formed. A cylinder block casting apparatus, which is capable of advancing and retreating and provided with a gas vent groove on an outer peripheral surface of an insert pin which is in sliding contact with the sliding surface.