JPS6338072Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mold structure for die casting, injection molding, or the like.

For example, in a die-casting machine, a fixed mold and a movable mold constituting the mold are respectively formed by a main mold and a nest removably fixed to the main mold, and the movable mold has a cavity surface on the upper surface. An extrusion pin penetrating the lower surface is provided, and an extrusion plate supporting the extrusion pin is provided outside the main mold, that is, outside the movable mold,
In some molds, the extrusion plate is moved to remove the molded product from the movable mold, and when molding a molded product of a different shape, the main mold is left in place and the insert is replaced.

However, in the conventional die casting machine,
When replacing the insert, the insert and the ejector pin cannot be removed at the same time, which makes the replacement work complicated.

In view of these points, the present invention consists of a fixed mold and a movable mold, respectively, consisting of a main mold and an insert that can be attached to and detached from the main mold. An extrusion pin is placed in either one of the inserts of the mold, and an extrusion pin is provided between the insert and the main mold constituting the mold, and the extruder is inserted into a hollow portion that penetrates the mold in the sliding direction of the insert. By providing an extrusion plate that supports the pin and an extrusion mechanism that comes into contact with the extrusion plate on the main mold, and making the extrusion operation system into two systems: the extrusion pin, the extrusion plate, and the extrusion mechanism, the insert and extrusion pin The purpose of the present invention is to provide a mold structure in which the main mold and the extrusion mechanism can be simultaneously and integrally replaced, and only the main parts consisting of the insert, ejector pin, and extruder plate can be easily changed, thereby solving the above-mentioned problems. be.

Hereinafter, one embodiment of the configuration of the present invention will be explained based on the drawings.

As shown in FIGS. 1 and 2, reference numeral 1 denotes a horizontal mold for an injection molding machine, in which a mold 2 is divided into a fixed mold 3 and a movable mold 4.
is fixed to the base plate 5 via support legs 6, and the fixed mold 3 is directly fixed to the base plate 7, respectively, and the mold is attached to the molding machine via the base plate.

Fixed and movable molds 3 and 4 are main molds 8 and 9 and insert 1
0 and 11, and the main molds 8 and 9 have U-shaped mounting grooves 12 and 13 at the opposing upper and lower parts, and guide grooves 14 and 15 at the corners of the mounting grooves 12 and 13.
However, the inserts 10 and 11 have cavity surfaces 16 and 17 on the opposing upper and lower surfaces, and guide pieces 1 at the corners.
8 and 19 are formed respectively, and guide pieces 18 and 1 are formed.
9 into the guide grooves 14 and 15, each insert 1
0 and 11 are detachably attached to the main molds 8 and 9. That is, the guide groove 14 and the guide piece 1
Numeral 8 forms an engagement means for slidably engaging the insert 11 with the main die 9, and also serves as a guide groove 1.
5 and the guide piece 19 form an engaging means for slidably engaging the insert 10 with the main mold 8. Further, recesses 20 and 21 are formed at the bottom of the mounting groove 12 in the main mold 9 and at the bottom of the insert 11, and both recesses 20 and 21 are hollow holes that penetrate the movable mold 4 in the sliding direction of the insert 11. 22. Furthermore,
Two insertion holes 23 opening into the cavity surface 16 and the recess 21 are bored in the insert 11, and an extrusion pin 24 is fitted into the insertion hole 23 so as to be vertically movable. An extrusion plate 25 is connected to the lower end of the extrusion pin 24 in the hollow part 22, and a spring 26 is interposed between the extrusion plate 25 and the upper surface of the recess 21, so that the extrusion pin 24 is moved by the spring force of the spring 26. It is biased downward. 28 is a guide pin of the extrusion plate 25 provided at the center of the recess 21, and 29 is a lower limit stopper of the extrusion plate 25 provided at the lower edge of the recess 21.

The main die 9 is provided with an extrusion mechanism 30 for the extrusion pin 24, and the extrusion mechanism 30 consists of a push rod 31 and a press plate 32 connected to the lower end of the push rod 31.
The push rod 31 is inserted into a communication hole 33 that opens between the recess 20 and the lower surface of the main die 9, and its upper end is connected to the extrusion plate 2.
It is in contact with 5. Reference numeral 34 denotes a hydraulic or pneumatic fluid pressure cylinder (the fixed mold 3 side is not shown) attached to the side surface of the lower main mold 9, which communicates with the mounting groove 12 via a pressure path 35, and is connected to the insert 11. is fixed to the main mold 9.

Next, the effect will be explained. First, during molding, each insert 10, 11 is placed in the fluid pressure cylinder 34.
is fixed to each main mold 8, 9 by an extrusion pin 24.
is lowered by the force of the spring 26, and from this state the movable mold 4 is moved to close the mold and molten metal is injected under high pressure. Subsequently, after the molten metal has solidified, the movable mold 4 is moved and the press plate 32 is moved. The push rod 31 presses the extrusion plate 25 and the extrusion pin 24 resists the spring force of the spring 26 and presses the cavity. It projects onto the surface 16 and releases the molded product from the movable mold 4.

Next, when forming a molded product of a different shape, after operating the fluid pressure cylinder 34 and releasing the fixation between each insert 10, 11 and each main mold 8, 9, each insert 10,
11 from the mounting grooves 12 and 13. that time,
In the insert 11, an extrusion pin 24 and an extrusion plate 25
is separated from the push rod 31 and inserts the insert 1 from the lower main mold 9.
1 and is removed through the hollow part 22. Subsequently, other inserts 10 and 11 having different shapes of cavity surfaces 16 and 17 are attached to each main mold 8 and 9, and molding is performed by the same operation as described above.

Note that the extrusion mechanism 30 may be equipped with various drive means using mechanical, electric, or hydraulic pressure, and in this embodiment, the molding machine is a horizontal type, but a vertical type may also be used. It may also be used for light alloy casting machines. Furthermore, although the extrusion pin 24, extrusion mechanism 30, etc. are provided in the movable mold 4, they may also be provided in the fixed mold 3.

Furthermore, in addition to forming the guide piece and the guide groove in the shape of the above-mentioned embodiment, the engagement means in the mold structure of the present invention may include, for example, forming both into a dovetail groove shape, or allowing the main mold and the insert to slide. Various modifications are possible, such as increasing the number of repetitions of surface irregularities.

As described above, according to the mold structure of the present invention, the fixed and movable molds are composed of a main mold and an insert that is detachable from the main mold, and the insert can be slid with respect to the mold. , an extrusion pin is inserted into one of the inserts of both molds, and the extrusion pin is extruded into a hollow portion that penetrates the mold in the sliding direction of the insert, which is provided between the insert and the main mold constituting the mold. The extrusion plate that supports the pin is provided with an extrusion mechanism in the main mold, and the extrusion operation system is made into two systems that can be separated into the extrusion pin, the extrusion plate, and the extrusion mechanism. Since the mechanism can be replaced simultaneously and integrally, setup time can be shortened when casting molded products of different shapes.In particular, by making the insert into a cassette, it is possible to perform one-touch operation. This means that changes can be made.

Furthermore, by standardizing various parts, it is possible to promote the standardization of molds, and in the case of molded products with similar shapes, it is possible to unify molding conditions, thereby improving quality and reducing variations. It can be prevented.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a cross-sectional front view of the mold structure, and FIG. 2 is a cross-sectional front view of the lower insert shown on an enlarged scale. 1... Mold structure, 2... Mold, 3... Fixed mold, 4... Movable mold, 8, 9... Main mold, 10, 1
1... Insert, 14, 15... Guide groove, 16, 1
7... Cavity surface, 18, 19... Guide piece,
22...Hollow part, 23...Through hole, 24...Extrusion pin, 30...Extrusion mechanism.

Claims (1)

[Scope of utility model registration request] The mold is divided into a fixed mold and a movable mold,
Each of the two molds is composed of a main mold and an insert, and the insert is removably engaged with the main mold through an engagement means that slidably engages the insert with the main mold. At the same time, a cavity surface is formed on the opposing surfaces of both the molds, and an insertion hole that opens to the cavity surface is formed in one of the molds, and the mold is configured. A hollow part is provided between the insert and the main mold, the hollow part passing through the mold in the sliding direction of the insert, and an extrusion pin is inserted into the insertion hole,
The hollow part is provided with an extrusion plate that supports the extrusion pin, and the main die is provided with an extrusion mechanism that abuts against the extrusion plate and moves the extrusion plate, and the extrusion plate is disposed through the hollow part. A mold structure characterized in that a pin is replaceable with respect to the main mold and the extrusion mechanism simultaneously and integrally with both of the inserts.