JPH0237939A - Mold forming machine - Google Patents

Abstract

PURPOSE:To simply remove a blowing hole part without applying the separating process by forming a mold, working ejector pins for parting the mold after removing the blowing hole part under condition of opening the dies, parting the mold together with the blowing hole part and taking out the mold. CONSTITUTION:After blow molding at the time of opening the dies 2 by working th upper die 3 upward, the mold (core) 5 is worked as pushing down with the ejector pins arranged at the upper die 3 so that the mold 5 is remained in the lower die 4, and also at the same time, blow ejector pin is worked so that the blowing hole part 10 is parted from the upper die 9. Under this condition, by working ejector pin working means 19, a working plate 23 is worked upward. To this, an ejector pin 18 for removing the blow abuts on the working plate 23 and works upward, and the end inclined face is projected from cavity 6 face and the blowing hole part 10 is pushed up to inside, to cut at connecting part with core print part 5a, and the blowing hole part 10 is laid on the mold 5. Successively, by ascending the working plate 23, the mold 5 is parted from the lower die 4 and carried to out of the die 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mold making apparatus for making molds such as cores.

(Prior Art) Various types of mold making apparatuses have been proposed in the past for making molds such as cores.
As seen in Japanese Patent No. 28613, a technique is known in which after a core is molded in a mold, deburring is performed when the core is released from the mold.

In general, molding of cores, etc. is carried out by blow molding, in which molding sand is blown into a mold cavity formed to correspond to the shape of the mold. A baseboard portion is provided, and a cavity having a shape corresponding to the shape of the core is formed in the mold.

(Problem to be Solved by the Invention) However, in a mold making device that molds a mold such as a core by blow molding, the blower is used as a passage for blowing molding sand into the cavity from a blow head outside the mold. A mouth must be connected to a part of the cavity, and a blowing part is integrally molded into the mold as a molded part corresponding to the shape of the blowing mouth, and a step is required to remove the blowing part from the mold after molding. become.

In addition, the above blower part is formed on the top surface of the baseboard part that supports the core in the main mold so that it does not affect the cast product. This increases the size of the molding sand, which increases the consumption of molding sand, and requires a separate process for removing the blow port after molding, which is an obstacle to improving productivity.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a mold making device that allows easy removal of a blower portion integrally formed in a mold.

(Means for Solving the Problems) In order to achieve the above object, the mold making device of the present invention has a baseboard forming part of a cavity and a blow mouth connected to the mold in an offset manner. An ejector pin for mold release was installed at the position corresponding to the blow opening, and an ejector pin for breaking the blow opening was installed at the position corresponding to the blow opening, molding sand was supplied into the cavity from the blow opening, the mold was blow-molded, and the mold was opened. In this state, the ejector pin actuating means operates the ejector pin for breaking the blow opening to break the blowing part integrally formed in the mold, and then operates the ejector pin for releasing the mold to perform Rt''l of the mold. It is configured so that it is provided.

(Function) In the above-mentioned mold making device, when a mold is formed by blow molding and the mold is opened, the ejector pin for breaking is activated, and the ejector pin is connected offset to the baseboard of the mold. After breaking off the blower part, the mold is released and taken out together with the blower part by operating a mold release ejector pin, so that the blower part can be easily removed without a separate process. .

(Example) Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows a cross-sectional configuration of essential parts of a mold making apparatus in an embodiment of the present invention.

The mold 2 of the mold making device 1 is composed of an upper mold 3 and a lower mold 4. Between the upper mold 3 and the lower mold 4, there is a mold 5 (core part) having a baseboard part 5a on the outer side. A cavity 6 corresponding to the shape of ) is formed. The lower mold 4 is fixedly held by a lower mold holder 7. Further, a heater 8 is installed in the upper mold 3 and the lower mold 4 to heat the molds.

A blow port 9 is formed in the upper mold 4 and communicates with the outside of the cavity 6 to blow molding sand into the mold.

This blowing port 9 is offset and connected to a baseboard forming part 6a that forms the baseboard part 5a of the cavity 6, and a blowing part is formed integrally with the mold 5 by the molding sand filled in this blowing port 9. 10 is integrally molded on the outside of the baseboard portion 5a of the mold 5 via a connecting portion having a narrower cross-sectional area than other portions.

A plurality of blow ports 9 (for example, 6 to 12) are provided depending on the size of the mold 5.

The blow port 9 is formed to pass upward through the upper mold 3 by fitting the sleeve member 12 thereinto, and is open on the upper surface of the upper mold 3. A blow head 13 (only a portion of which is shown) is installed above the upper mold 3 of the mold 2 so as to be movable up and down by a lifting means (not shown). This blow head 1
Molding sand is supplied into the molding sand 3, and this molding sand is moved by pressurized air to the blow nozzle 1 installed on the bottom of the blow head 13.
4 into the cavity 6 through the blow port 9. The blow nozzles 14 are arranged in a number corresponding to the number of installed blow ports 9, and are inserted into each blow port 9 with the blow head 13 being operated downward. A hook engaging portion 3a extends from the side surface of the upper mold 3 of the mold 2, and when the upper mold 3 is raised, a lifting hook 15 is engaged with the hook engaging portion 3a and lifted. .

On the other hand, an ejector pin 17 for releasing the mold and an ejector pin 18 for breaking the blow opening are slidably attached to the lower mold 4 of the mold 2. That is, the mold release ejector pin 17 is disposed so that its tip faces the bottom of the cavity 6, and lifts the mold 5 formed in the lower mold 4 and releases it from the lower mold 4.
It is to be released from the mold. Further, the blow port breaking ejector pin 18 has a tip formed on an inclined surface, and is disposed so as to face the bottom surface of the blow port 9, which is also formed on the slope. and baseboard 5
This is to break the connecting part with a.

Both ejector pins 17 and 18 are actuated with a predetermined time difference by the ejector pin actuating means 19 when the mold is opened after blow molding. The lower end of the ejector pin 17 for mold release is attached to the ejector plate 20, while the lower end of the ejector pin 18 for breaking the blow opening protrudes from the ejector plate 20 by a predetermined amount and is slidably linked to the blow opening. A return spring 21 is interposed to bias the ejector pin 18 in the backward (downward) direction. The ejector plate 20 is supported by a return bin 22 so as to be movable up and down with respect to the lower mold 4, and is operated to move up and down in conjunction with a drive device (not shown) facing below the ejector plate 20. A plate 23 is installed.

Next, the operation of core molding with the above configuration will be explained. After lowering the upper mold 3 and placing it on the lower mold 4 to close the mold, the blow head 13 is lowered to open the blow nozzle 14.
is aligned with the blow port 9, and molding sand is filled into the cavity 6 from the blow port 9 by supplying pressurized air. Subsequently, the blow head 13 is raised and the molding sand in the cavity 6 is hardened by the heat of the mold 2 to perform blow molding.

After the above-mentioned blow molding, first, the upper mold 3 is moved upward to open the mold 2. At this time, an ejector pin (Fig. At the same time, a blower ejector pin (not shown) is operated at the same time as the ejector pin so that the blower part 10 is released from the upper mold 3.

When the mold 5 remains on the lower mold 4 as shown in FIG. 2 as described above, the ejector pin actuating means 19 is driven to move the actuating plate 23 upward. In response to this upward movement of the operating plate 23, first, as shown in FIG. The blower part 10 is pushed up inward and folded at the connecting part with the baseboard part 5a, and the blower part 10 is placed on the mold 5.

Subsequently, as the operating plate 23 moves upward, the operating plate 23 pushes up the ejector plate 20 and also raises the ejector pin 17 for releasing the mold.As shown in FIG. The mold 5 is released from the mold and lifted together with the blower part 10, and the mold 5 is carried out of the mold.

Thereafter, the operating plate 23 is lowered, and each ejector pin 17, 18 is lowered to return to its original state.

According to the embodiment described above, as the mold 5 is released by the ejector pin 17 for releasing the mold, the blower part 10 is broken and placed on the mold 5 by the linked operation of the ejector pin 18 for breaking the blow opening. As a result, the blow port 9 can be easily removed, improving productivity. In particular, by making the raised part at the tip of the ejector pin 18 for breaking off the blow mouth a sloping surface, the broken blow blow part 10 can be reliably transferred to the mold 5.
Both can be placed on top of each other and both can be taken out at the same time, reducing cleaning time. In addition, by forming the blow port 9 offset from the baseboard molding part 6a,
The baseboard portion 5a is small (this reduces the amount of molding sand consumed, which is advantageous in terms of cost).

In addition, the ejector pin 17 for mold release in the above embodiment
The number of ejector pins 18 for blow opening breakage is appropriately set depending on the shape of the mold 5.

(Effects of the Invention) According to the present invention as described above, the blow opening and the baseboard molding part are arranged in series in an offset manner in the mold, and the blow opening opening is operated at a predetermined timing by the ejector pin actuating means. An ejector pin and an ejector pin for mold release are provided, and after blow molding is performed and the mold is opened, the ejector pin for breaking is activated, and then the ejector pin for mold release is activated. After the part is broken off, the mold is released and taken out together with the blower part using a mold release ejector pin, and the blower part can be easily removed without a separate process.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a mold making apparatus according to an embodiment of the present invention, and FIGS. 2 to 4 are cross-sectional views of main parts sequentially showing the mold release operation of a mold. 1...Mold making device, 2...Mold, 3
...Top mold, 4...Bottom mold, 5...
・Mold (core), 5a... Baseboard part, 6...
...Cavity, 6a... Baseboard molding part, 9...
...Blow port, 10...Blow blow part, 14
...... Blow nozzle, 17... Ejector pin for mold release, 18... Ejector pin for blow opening breaking, 19... Ejector pin operating means, 20 ...Ejector plate, 23.
...Operating plate.

Claims (1)

[Claims] (1) The baseboard molding part of the cavity and the blow port are offset and connected in the mold, and the ejector pin for mold release is placed at the position corresponding to the cavity, and the blow hole is placed at the position corresponding to the blow port. A mold release ejector pin is provided respectively, and molding sand is supplied into the cavity from the blow port to blow mold the mold. After operating the blow port break ejector pin with the mold open, A mold making device comprising an ejector pin operating means for operating an ejector pin.