JPH0148105B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method of manufacturing an integrally joined mold using a vertical split molding machine that integrally joins half molds (including a core) within the same molding cycle. These molding means can also be applied to a method of molding an integrally bonded mold having an internal cavity.

PRIOR TECHNOLOGY A split mold making device equipped with a fixed mold, a movable mold, and a mandrel or an intermediate mold has been known for a long time.This split mold molding device uses a complicated mechanism to open and close the intermediate mold, and cannot be done manually. This method has the disadvantage that failures occur frequently due to the operation, and furthermore, it is not known that a hollow mold having a bag-like cavity inside can be molded in one molding cycle.

Furthermore, the current practice of integrating molds is usually to mold half molds (including the core) using separate molding machines, then take out each half mold and glue them together using separate adhesive machines.

Problems to be Solved by the Invention The half molds (including the core) can be molded in the same molding cycle (that is, in the same molding machine) without using adhesives, using the same molding material, and The object of the present invention is to provide a molding method for obtaining an integrally bonded mold having a void portion.

Means for Solving the Problems The structure of the molding method of the present invention is as specified in each claim above, and will be explained in detail based on the attached drawings showing one specific example of the present invention.

FIG. 1, which shows an example of a vertical split molding machine suitable for the molding method of the present invention, is a front view showing only the main parts, in which 1 is a left mold, 2 is a right mold, 3 is a core mold, and 4 is an unloader. , 5 is a blow head, and 6 is a gashing head.Other illustrated members are those included in a normal vertical split molding machine unless otherwise specified.

The left mold 1 has a mechanism in which it slides along a guide rod 10 by the operation of a cylinder 11. The right mold 2 similarly slides left and right by the operation of the cylinder 12. These left and right molds 1 and 2 have, on their split surfaces, mold forming cavities for the left and right halves of the target mold. The core mold 3 is moved up and down to a fixed position between the split surfaces of the left and right molds by the operation of the cylinder 13. This core mold 3 has a pattern 3' on both sides of its upper part for forming a joining cavity, which will be described later, and a pattern 3'' for forming a mold cavity 24 on both sides of its lower part.The unloader 4 is built-in. Raised and lowered by a cylinder,
The completed mold that has been joined together is inverted into a cylinder 14.
It is received from the right mold 2 which has been flipped downward by the operation of .

In the above embodiment, the left and right molds 1 and 2 are configured to slide left and right, but either one of the molds may be of a fixed type. In that case, the core mold 3 not only moves up and down, but also moves left and right. It is also necessary to have a moving operation.

The main mechanism of the vertically split molding machine suitable for the molding method of the integrally joined mold of the present invention has been explained above.
An example of the molding method of the integrally bonded mold of the present invention is shown in the second example.
This will be explained based on FIGS.

FIG. 2 shows the arrangement of each member at the beginning of the mold making/joining cycle, which is the same as the arrangement shown in FIG.

Figure 3 shows the mold matching and blowing process, and the core mold 3
rises and stops at a predetermined position, and the left and right molds 1 and 2
The figure shows the state in which the molding sand 20 is blown into the mold assembly by sliding the molds on both sides of the core mold 3, and then pressing the blow head 5 onto the upper surface of the mold assembly. FIG. 4 shows the gashing process. After the blowing of molding sand is completed, the blow head 5 is returned to the predetermined position, and the gashing head 6 is
is crimped onto the upper surface of the mold assembly to perform gutting.

Figure 5 shows the mold opening process. After the filled molding sand has hardened after gutting, the molds are opened in the order of left mold 1, right mold 2, and core mold 3. 21 and 22 are respectively shaped and held as shown in the figure.

FIG. 6 shows the mold matching process, in which the left and right molds holding the half-split molds 21 and 22 are slid as shown by the arrows to match the molds, forming a joining cavity 23 and a mold cavity 24 (bag-shaped cavity). (or a blind hole-like void).

FIG. 7 shows the process of filling the joining void 23,
The blow head 5 is pressed onto the upper surfaces of the matched left and right molds (holding the half molds 21 and 22), and molding sand is blown into the joining gap 23.

FIG. 8 shows the process of gushing the molding sand filled into the bonding cavity 23. After the filling process is completed, the blow head 5 is returned to its original position, and the gushing head 6 is
is pressed onto the upper surface of the matched mold to perform gutting, and the molding sand filled in the joining cavity is hardened, and the half molds 21 and 22 are integrally joined into the mold 25.
becomes.

9 to 11 show the mold release process of the integrally joined mold 25. In FIG. 9, the extrusion mechanism of the left mold 1 is operated, and while the integrally joined mold 25 is held in the right mold 2, the arrow Slide the right mold 2 in the direction. Next, as shown in FIG. 10, the right mold 2 is reversed 90 degrees downward by the operation of the reversing cylinder 14, and the extrusion mechanism built in the right mold 2 is used to integrally bond the mold 25.
is extruded onto the unloader 4 and released from the mold, and at the same time the left mold 1 is returned to the predetermined position. Finally, as shown in FIG. 11, the right mold 2 is reversed and returned to the predetermined position, and the released integrally joined mold 25 is carried out of the molding machine, and the process is repeated to move on to the next molding/joining cycle. .

The above is one molding/joining cycle in the illustrated example, but the structure and operation mode of each member can be slightly changed or modified based on known means without being limited to this example. For example: (1) One of the left and right molds is a fixed mold, and the core mold is a mechanism that can move vertically and horizontally.

(2) The unloader is also not limited to the illustrated model, and may be of any known unloading mechanism.

(3) It can be applied not only to the cold box method but also to the heating molding method.

(4) Applicable not only to core molding but to all mold molding.

(5) Can also be applied to simple integral joints with no internal voids.

(6) By using a mechanism that combines a plurality of movable molds and a plurality of core molds, a large number of molds can be manufactured in one molding/joining cycle.

Advantages of the Invention (1) Since the mold is not bonded using an adhesive or the like, there is no need to consider the adhesive thickness, so a mold with high precision can be produced.

(2) With the same molding machine, molding and joining can be performed by increasing the opening and closing process of the left and right molds by one step, and a finished mold that is integrally joined can be obtained.

(3) By using a core mold with two split surfaces, molding is possible regardless of the draft angle, compared to the conventional molding method using a mandrel.

(4) It is easy to create a mold that has voids that are difficult to release.

(5) Applicable to both cold box and heat molding methods.

(6) Since the half-split molds are manufactured simultaneously, twice as many products can be obtained as compared to the conventional method of molding them individually.
The number of molding machines can be halved.

(7) There is no need for handling between the molding machine and the bonding machine, and the initial cost is also low.

(8) It is possible to omit the conventional method's inserts and gas needles, as well as the provision of "Oiteko" etc.

[Brief explanation of drawings]

FIG. 1 is a front view showing only the main parts of an example of a molding machine suitable for the molding method of the present invention, and FIGS. 2 to 11 are explanatory diagrams sequentially showing the molding and integral joining processes of the present invention. Middle: 1 is the left mold, 2 is the right mold, 3 is the core mold, 4 is the unloader, 5 is the blow head, 6 is the gashing head, 10 is the guide rod, 11, 12
are cylinders for operating the left and right molds, 13 is a cylinder for raising and lowering the core mold, 14 is a cylinder for reversing the right mold, 20 is molding sand, 21 and 22 are hardened half-split molds, 23 is a gap for joining, 24 is the mold cavity, 2
5 shows an integrally joined mold.

Claims (1)

[Scope of Claims] 1. A mold having a pattern forming a joining cavity in which the same molding material is injected into the left and right molds and the left and right half-split molds, and which moves and stops at a fixed position between the split surfaces of the left and right molds. Using a vertical split molding machine consisting of a core mold, mold matching, blowing, curing, mold opening, mold matching of left and right molds holding split molds, and re-injection of molding material into the joining cavity. A molding method for an integrally bonded mold, characterized in that it consists of combining the steps of re-hardening, mold release and transport. 2. The method of manufacturing an integrally bonded mold according to claim 1, wherein the curing and re-hardening are curing with a reactive gas or heat curing.