JPS61232053A - Production of cylinder block for v engine by horizontal type casting machine - Google Patents

Abstract

PURPOSE:To prevent surely the fall of cylinder sleeves by holding the sleeves by means of an anti-fall pin which is held projected from a die side and preventing the fall by means of a core provided to the other die side after die closing. CONSTITUTION:The upper die 8 and the lower die 9 are pressed to upper and lower set mandrels 12, 13 and the anti-fall pin 23 is moved downward to detain the bottom end with the bottom end face of the upper cylinder sleeve S2, thereby holding the sleeve. A sleeve setter until 15 is thereafter ejected from between the stationary die 1 and the movable die 5 and the dies are closed. The top and bottom tapered surfaces 4, 4 of the core 3 of the die 1 contact with the end faces of the upper and lower cylinder sleeves S1, S2 when the dies are closed. The pin 23 is moved upward after the die closing to detach the bottom end from the bottom end face of the sleeve S2 and to retract the same into the upper sliding die 8. A molten metal is then filled into the cavity formed of the molding parts 2, 7, the core 3, the die 8 and the die 9, by which the cylinder sleeves S1, S2 are cast.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for manufacturing a cylinder block for a V-type engine using a horizontal casting machine. When die-casting a cylinder block by setting it from diagonally below and diagonally above into one mold of the machine, in order to prevent the cylinder sleeve set from diagonally below from falling before the mold is closed,
Conventionally, a sliding upper mold disposed between a movable mold and a fixed mold is provided with a protrusion, and this protrusion is engaged with the lower end surface to hold the cylinder sleeve.

(Problem to be solved by the invention) However, since holes are formed in the casting due to the protrusions provided on the mold side, it is necessary to seal these holes, which poses problems such as increasing the number of post-processes. .

Therefore, an object of the present invention is to prevent the cylinder sleeve set from below from falling into the mold without the need to provide a protrusion on the mold side, and to avoid the formation of holes in the casting.
V using a horizontal casting machine that contributes to simplifying the post-process
The present invention provides a method for manufacturing a cylinder block for a type engine.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a cylinder sleeve (Sl), (
S2) is set into one mold (5) of the horizontal casting machine from diagonally below and diagonally above, and the cylinder sleeve (S2) is dropped from the mold (5) side onto the lower end surface of the cylinder sleeve (S2) set from diagonally below. The prevention pin (23) is protruded and locked, and the core (3) provided in the other mold (1) is applied to the end face of each cylinder sleeve (Sl), (S2) to close the mold and prevent it from falling. The pin (23) is pulled into the mold (5) and the cylinder block is cast.

(Function) Prior to mold closing, the fall prevention pin (23) protruding from the mold (5) side holds the cylinder sleeve (S2) set in the mold (5) diagonally from below, and holds the cylinder sleeve (S2) set in the mold (5) from diagonally downward. Prevent falls.

After the mold is closed, this cylinder sleeve (S2) is prevented from falling by the core (3) provided in the other mold (1), and the pin (23) is retracted into the mold (5) side. Since it does not face the inside of the product cavity, there are no holes in the casting as in conventional castings, which simplifies post-processing and provides high quality.

(Example) Examples will be described below based on the accompanying drawings.

Figures 1 and 2 are front sectional views with the lower part omitted, showing the open and closed states of the horizontal casting machine.
The molding part (2) of 1) is equipped with a core (3), and a movable mold (5) is disposed on the left side in the figure, facing the fixed mold (1).

The movable mold (5) has a mold body (6) equipped with a molding part (7).
) and a sliding upper mold (8) placed above and below the front of this.
The upper mold (8) and the lower mold (8) are vertically slidable by hydraulic cylinder units (11) installed above and below the mold body (8). It is free to move.

In addition, upper and lower sleeve set core metals (12) and (13) are inserted obliquely into the mold body (5) in front of the molding part (7) and can move forward and backward in a direction intersecting the center line (see). The sleeve set core metals (t2) and (13) are connected to the hydraulic cylinder unit (1) installed at the rear of the mold body (8).
4), it can freely move up and down the molding part (7).

The fixed mold (1) and movable mold (
5) In the mold open state, there is a known sleeve setter unit (15) as shown by phantom lines in FIG.
is carried in, and the upper and lower casting cylinder sleeves (St), (S2
) are respectively fitted and set at the tips of the sleeve set core metals (12) and (13) in the mold body (8) of the movable mold (5).

In the above, a bracket (1B) is fixed on the upper surface of the sliding upper mold (8) of the movable mold (5), and this bracket (
16) Install a hydraulic cylinder unit (17) on top,
The piston rod (1) protrudes from the bottom surface of the bracket (17).
8) The first plate (21) is fixed at the bottom, and the molded part (
7) A second plate (22) is fixed to the lower surface of the first plate (21) located above the second plate (22).
) is fixed with a sleeve fall prevention pin (23) hanging down.

When falling, the I hip pin (23) passes vertically through the sliding upper mold (8), and its lower end is freely retractable from the lower surface of the upper mold (8).

In this example, in order to cast a cylinder block for a six-cylinder V-type engine, three fall prevention pins (23) are provided in the front and back directions of the drawing.

Next, we will discuss the effect.

First, the sleeve set core metals (12) and (13) are in the forward position shown in the figure and are in contact with the upper and lower surfaces of the base of the molded part (7), and the sleeve setter unit (15) is carried in so as to face them. The cylinder sleeve (s2) is fitted to the tip of the upper set core metal (12) from diagonally below, and the cylinder sleeve (Sl) is fitted to the tip of the lower set core metal (13) from diagonally above. be done.

At the same time as the sleeve is set, the upper sliding mold (8) is moved down and the lower sliding mold (8) is moved up, as shown in FIG. Lower mold (9
) are brought into contact with the upper and lower set core bars (12) and (13), respectively, and the fall prevention pin (23) is moved downward to lock its lower end to the lower end surface of the upper cylinder sleeve (s2). The cylinder sleeve (s2) is held by the pin (23).

After that, the sleeve setter unit (15) is carried out from between the fixed mold (1) and the movable mold (5), and the movable mold (5) is advanced toward the fixed mold (1). By this mold closing, the upper and lower tapered surfaces (4) of the core (3) of the fixed mold (1) are connected to the upper and lower cylinder sleeves (4).
St) and (S2), respectively.

After the mold is closed, the fall prevention pin (23) is moved upward to separate its lower end from the lower end surface of the upper cylinder sleeve (S2) and to be retracted into the sliding upper mold (8).

In this way, the product cavity formed by the molding parts (2), (7), the core (3), the upper sliding mold (8), and the lower sliding mold (9) is filled with molten metal, and the V The cylinder block of the type engine is die-cast, and the cylinder sleeve (Sl
), (S2) are cast.

After casting, open the fixed mold (1) and movable mold (5),
The upper sliding mold (8), the lower sliding mold (9), and the sleeve set core metals (12) and (13) are moved back and the casting is discharged.

In this way, prior to mold closing, the cylinder sleeve (S2) set on the movable mold (5) is held diagonally from below by the fall prevention pin (23), and in the mold closed state, the cylinder sleeve (S2) is held in the movable mold (5) by the fall prevention pin (23).
This cylinder sleeve (S2) is connected to the core (3) of 1).
Since the cylinder sleeve (S2) is held, it is possible to reliably prevent the cylinder sleeve (S2) from falling.

Moreover, during casting, the lower end of the drop prevention pin (23) does not protrude into the product cavity but is retracted into the sliding upper mold (8), so there is no hole in the casting as in the conventional case. It simplifies post-processing after casting and maintains high product quality.

(Effects of the Invention) As described above, according to the present invention, a cylinder block for a V-type engine is manufactured in which a cylinder sleeve for casting is set into one mold of a horizontal casting machine from diagonally below and diagonally above, respectively. In this method, prior to closing the mold, a cylinder sleeve set diagonally from below is held with a fall prevention pin, and when the mold is closed, this cylinder sleeve is held with a core provided in the other mold, and the cylinder sleeve is held in place to prevent it from falling. Since the lower end of the prevention pin is not exposed to the inside of the product cavity, it is possible to reliably prevent the cylinder sleeve set from diagonally below the mold from falling before and after the mold is closed, and to avoid unnecessary holes in the casting. It is possible to prevent this from occurring, thereby simplifying post-processes and maintaining high product quality.

[Brief explanation of drawings]

FIG. 1 is a front sectional view with the lower part omitted showing the horizontal casting machine in the mold open state, and FIG. 2 is a similar front sectional view showing the mold in the closed state. In addition, (1) in the drawing is the fixed mold, (2) is the molding part, and (3)
is the core, (5) is the movable mold, (8) is the mold body, (7)
is the molding part, (8) is the upper sliding mold, (9) is the lower sliding mold,
(12), (13) are sleeve set core metal, (15)
are sleeve setter units, (11), (14), (
17) is a hydraulic cylinder 22), (23) is a fall prevention pin, and (Sl) and (S2) are cylinder sleeves. Figure 2 □

Claims (1)

[Claims] A cylinder sleeve to be cast into a cylinder block of a V-type engine is set into one mold of a horizontal casting machine from diagonally below and diagonally above, respectively, and the lower end surface of the cylinder sleeve set from diagonally below is placed on the mold side. After the fall prevention pin is protruded and locked from the mold and the core provided in the other mold is applied to the end face of each cylinder sleeve to close the mold, the fall prevention pin is retracted into the mold side and the cylinder block is cast. A method for manufacturing a cylinder block for a V-type engine using a horizontal casting machine, characterized in that: