JPS5922909Y2 - Core molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding device for a core, and particularly to a molding device suitable for molding a sleeve for an internal combustion engine cylinder, etc., and a core that requires a large number of inserts.

There are two types of core molding equipment: a vertical split mold machine in which the split mold is installed so that the contact surface of the split mold is vertical, and a horizontal split mold machine in which the split mold is installed so that the contact surface of the split mold is horizontal. There is.

Since the vertical split molding machine sets the sleeve and insert in a vertical mold, the work is not only difficult and time-consuming, but also there is a risk that the sleeve and insert may separate from the mold when the mold is clamped.

In addition, since the horizontal split molding machine sets the sleeve and insert in the mold in a horizontal state, the work time is short and the insert can be set reliably, but on the other hand, it is impossible to hollow out the core by removing sand. Therefore, the cost of core sand becomes expensive, and degassing is not possible, which has a negative effect on cast products.

The present invention provides a core molding device that eliminates these drawbacks, and is characterized by the use of two split molds with core sand injection ports formed on opposing contact surfaces. Each is supported on a rotating frame, and at least one of the split molds is
It is installed so as to be slidable along the rotary frame, and the approximately center of the L rotary frame in the longitudinal direction is rotatably supported by the fixed frame.

The present invention will be described below with reference to embodiments shown in the drawings.

The embodiment shown in FIG. 1 shows a shell core molding apparatus A and a core sand supply apparatus B.

The rotating frame 1 has a shaft 2 protruding from the center of its side surface and a fixed frame 3.
It is rotatably supported by the fixed frame 3 by being mounted on a bearing 4 disposed in the
is firmly attached.

The rotating frame 1 has a slide arm 6 installed in its longitudinal direction,
A movable die base 7 and a movable split die 8 are slidably engaged with the arm.

Further, at one end of the rotating frame 1, a fixed split die 9 disposed opposite to the movable split die 8 is supported via a fixed die base 10, and at the other end of the rotating frame 1, a fixed split die 9 is supported via a fixed die base 10. An air cylinder 12 connected to the end surface of the die base 7 via a rod 11 is disposed.

] 3 is a blowing port for the core sand formed on the back side of the split molds 8 and 9 in FIG. 1 (II), 14 is an ejector bin for removing the molded core, and 15 is a fixed A vibrator 16 disposed on the end face of the die base 10 is a pedal for operating the piperator.

The core sand supply device B has a stud 21 and a support stand 22, 23 arranged on a fixed frame 3, and furthermore, a horizontal arm 24 is rotatably supported on the stud 21, and the support stand 2 is rotatably supported on the stud 21.
2.23 has a core sand hopper 25 and an air cylinder 26
are fixedly placed.

The horizontal arm 24 fixedly supports an air cylinder 27 at its tip, and supports a core sand blowing nozzle 29 via a rod 28 of the cylinder, and the other end of the horizontal arm 24 supports an air cylinder 27 via a rod 30. It is connected to the air cylinder 26.

Note that 31 is a hose connecting the hopper 25 and the blowing nozzle 29.

Core molding device A and core sand supply device B of the above embodiments
The shell core molding process will be explained below.

First, the rotating frame 1 is positioned in the state shown in FIG. etc. are set in the movable split mold 8.

Next, the cylinder 12 is operated to raise the movable die base 7 and the movable split mold 8, and the movable split mold 8 is brought into contact with the fixed split mold 9 to perform mold clamping (see FIG. 2 (II)).

Next, operate the bundle 5 to move the rotating frame 1 clockwise 9
The core sand blowing nozzle is rotated 0 degrees and positioned as shown in FIG. 2 (III), and then the cylinder 26 is operated to rotate the horizontal arm 24 counterclockwise in FIG. 29 is positioned above the blowing hole 13 formed in the split molds 8 and 9, and the cylinder 27 is actuated to lower the blow nozzle 29, so that the nozzle is aligned with the blowing port 13 of the split molds 8 and 9. After that, remove the hose 3 from the hopper 25.
1. Core sand is blown into the split molds 8 and 9 through the blowing port 13 (
(See Figure 2 (III)).

Next, the bundle 5 is operated to rotate the rotation frame 1 by 180 degrees to position it in the state shown in FIG. 2 (IV).

When the rotating frame 1 is in this state, the blowing ports 13 of the split molds 8 and 9 are located downward, so that excess core sand that does not adhere to the inner surfaces of the split molds 8 and 9 falls and is discharged.

As a result, a hollow portion is formed within the core.

Next, the cylinder 12 is operated to move the movable die base 7 and the movable split mold 8 to the rightmost end as shown in FIG. 2(V).

Then, the end of the ejector pin 14 hits the end of the rotating frame 1, and the tip of the ejector pin 14 moves relatively within the movable die base 7 and the movable split mold 8, protrudes into the movable split mold 8, and moves inside the movable split mold 8. The child 17 is separated from the movable split mold 8.

Next, in this state, the insides of the split molds 8 and 9 are cleaned by the injection nozzle 29, and a release agent is applied to the insides of the split molds (see FIG. 2 (■■)).

Next, the bundle 5 is operated to rotate the rotating frame 1 90 degrees clockwise to position it again in the state shown in FIG. raise it to a certain position.

In the work process in the above embodiment of the present invention, the rotating frame 1 is always rotated clockwise, and the rotating direction of the rotating frame 1 is changed from the state shown in FIG. 2 (III) to the state shown in FIG. The rotation range of the rotation frame 1 may be 180 degrees if the rotation is made counterclockwise until the state shown in IV) is reached.

As described above, the core molding device according to the present invention can form sleeves, inserts, etc. with the split mold in a horizontal state, and can perform mold clamping while maintaining the horizontal state. Okiko sand can be blown in vertically, and excess core sand can be discharged in the same way, making it possible to obtain hollow cores with high work efficiency and high precision.

[Brief explanation of drawings]

Figures 1 (I) and (II) are conceptual diagrams showing a core molding machine according to the present invention, with Figure 1 (I) being a front view thereof and Figure 1 (II) being a plan view thereof. , Fig. 2 (I) to (IV
) is a diagram showing the process of molding a core using the core molding machine according to the present invention, and FIG. 2(I) shows the sleeve,
Figure 2 (II) is a diagram showing the state of setting the inserts, etc., Figure 2 (II) is a diagram showing the mold clamping state, Figure 2 (III) is a diagram showing the state of blowing core sand, Figure 2 ( IV) is a diagram showing the sand removal state, Figure 2 (V) is a diagram showing the demolding state, and Figure 2 (V
I) is a diagram showing the state of cleaning and application of a mold release agent. 1...Rotating frame, 8...Movable split mold, 9.
...Fixed split mold, 12...Cylinder, 13
...Inlet.

Claims (1)

[Scope of utility model registration request] Two split molds 8 and 9 with core sand blown [113] formed on opposing contact surfaces are each supported on the rotating frame 1, and
At least one split mold 8 or 9 is installed slidably along the rotating frame 1, and the longitudinal center of the rotating frame 1 is rotatably supported by the fixed frame 3. A molding device for cores.