JPH0372373B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a die casting device for die casting or injection molding. This invention relates to a runner blocking device that stops pouring metal into a cavity.

(Prior art) Generally, metal molds are expensive, so when casting small quantities of castings, it is necessary to
By forming a plurality of irregularly shaped cavities whose pressure capacity exceeds or is below the pressure capacity of the mold device, and by appropriately selecting and blocking the runners of some of these cavities, the mold is The pressure is set below the pressurizing capacity of the equipment, and the type of castings corresponding to the number of productions is obtained.

By the way, as a conventional technique, there is a structure shown in FIGS. 5 to 7.

In FIG. 5, reference numeral 1 denotes a mold molding device, in which a fixed platen 3 and a movable platen 4 are arranged in an upright position facing each other on the right and left sides of a base 2, and a fixed mold 5 and a movable platen 4 are arranged facing each other on the right and left sides of a base 2, respectively. The movable mold 6 is connected.

The fixed platen 3 is fixed to the base 2, the movable platen 4 is placed so as to be movable in the left and right direction,
The movable mold 6 is moved toward and away from the fixed mold 5 by reciprocating in the left-right direction by a reciprocating device 7 such as a hydraulic cylinder.

As shown in FIGS. 5 and 6, a plurality of irregularly shaped cavities 8, 9, 10, 11 are formed on the mating surface of each of the molds 5 and 6, and these are formed on the mating surface of the movable mold 6. Formed branch runners 8a, 9a, 10
A, 11a are connected in parallel to a common main runner 12, and the lower end of the main runner 12 is communicated with the outside through a sprue 13 formed through the fixed mold 5 and the fixed platen 3.

For cavities that are produced in small numbers, for example, cavity 8, when a predetermined number of lots are completed, the branch runner 8a is closed by overlay welding 14 as shown in FIGS. 6 and 7.

(Problems to be Solved by the Invention) The above-mentioned conventional device had the drawback that the branch runner 8a of the corresponding cavity 8 was closed by overlay welding 14, and this closing operation required time and skill. In particular, when it is decided to change the blocked branch runner every predetermined number of lots, the overlay welding 14
In addition to re-grooving the section, the other branch runners are closed by build-up welding, and the above-mentioned drawbacks become more noticeable.

SUMMARY OF THE INVENTION An object of the present invention is to obtain a novel runner closing device for a metal molding device that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows.

A fixed mold and a movable mold that moves toward and away from the fixed mold are provided, and a plurality of cavities and a runner connecting the cavities to a sprue are formed at the joint surface of the fixed mold and the movable mold. In the metal mold apparatus, a valve body is provided at a mating surface of one of the fixed mold and the movable mold, and advances and retreats along the mating surface to shield and communicate a part of the runner. and a drive device that moves the valve body forward and backward in conjunction with the movable mold that moves toward and away from the fixed mold.

(Function) Since the present invention has the above-mentioned configuration, each time the movable mold approaches and separates from the fixed mold, the valve body is moved forward and backward by the drive device to close a part of the runner. They fit and separate, shielding and communicating the runners.

Further, when the valve body separates from the part of the runners, the valve body is separated from the solidified material in the runners with which it was in contact when the valve body was fitted.

(Example) Embodiments of the present invention will be described below based on the drawings.

First, in the drawings, FIG. 1 is a cross-sectional front view of a main part showing a dividing surface of a movable mold showing an embodiment of the present invention;
FIG. 2 is a sectional view corresponding to that point, FIG. 3 is a front view showing the dividing surface of the movable mold with the valve body in an open state, and FIG. 4 is a sectional view corresponding to that point.

Of the symbols attached to Figures 1 to 4, Figures 5 to 4
Portions with the same symbols as in FIG. 6 have substantially the same configuration as in FIGS. 5 and 6.

15 and 20 are runner blockage devices having approximately the same configuration;
They are provided at the joint surfaces of the fixed mold 5 and the movable mold 6, and to the right of the branch runners 8a and 9a, respectively, in FIG.

That is, rectangular parallelepiped-shaped holder fitting holes 16 and 21 and cylindrical valve body fitting holes 17 and 22 are formed extending in series toward the right on the right end mating surfaces of the fixed mold 5 and the movable mold 6. and valve body fitting holes 17, 22
The left end is communicated with the branch runner 8a and the branch runner 9a.

The holder fitting hole 16 and the valve body fitting hole 17 have
The rectangular parallelepiped-shaped holder 18 and the cylindrical valve body 19 are screwed together and fitted to be slidable in the left-right direction, and in the same way, the holder fitting hole 21 and the valve body fitting hole 22 are provided The rectangular parallelepiped-shaped holder 23 and the cylindrical valve body 24 are screwed together and fitted to be slidable in the left-right direction.

The above-mentioned valve bodies 19, 24 have a cross-sectional area of the branch runner 8
a, larger than the cross-sectional area of 9a.

The connection between the valve body 19 and the holder 18 is achieved by fitting the collar 25 into the bottom of the screw hole of the holder 18, as shown in FIG.
By making the amount of screwing shallow with the collar 25, the valve body 19 is connected to the holder 18 with a large protrusion to the left, so that when the holder 18 is moved to the left end of the holder fitting hole 16, is the valve body 19
The left end portion of the branch runner 8a is set so as to fit into the longitudinally intermediate portion of the branch runner 8a to close this portion. Note that 26 is a locking spring for preventing the valve body 19 from loosening.

Further, the connection between the valve body 24 and the holder 23 is
As shown in the figure, the insertion of the collar 25 is stopped and the threaded portion of the valve body 24 is screwed to the bottom of the screw hole of the holder 23, thereby reducing the amount of protrusion of the valve body 24 from the holder 23. As a result, when the holder 23 moves to the left end of the holder fitting hole 21, the left end of the valve body 24 is set so as to reach the right wall of the longitudinally intermediate portion of the branch runner 9a, that is, just in front of the branch runner 9a. do. In addition,
8b and 9b are locking recesses formed in the left wall of the longitudinally intermediate portions of the branch runners 8a and 9a, and when the valve bodies 19 and 24 pass through the branch runners 8a and 9a, the left end thereof It is fitted and locked.

Further, the holders 18 and 23 are connected to the drive device 3.
0 and 35, the movable mold 6 is moved in the left-right direction in FIGS. 1 and 2 in conjunction with the reciprocating movement of the movable mold 6.

That is, as shown in FIG.
3 are formed with guide holes 31 and 36 that are inclined toward the center of the fixed mold 5 from the movable mold 6 side toward the fixed mold 5, and protrude toward the movable mold 6 at the right end of the fixed mold 5. , the movable mold 6
Cylindrical drive pins 32, 3 that are inclined outwardly.
Fix 7.

Above, guide holes 31, 36 and drive bins 32, 3
The inclination angle and length of the guide hole 31 and the drive pin 32 on the upper side will be explained below.

That is, when the movable mold 6 moves toward the fixed mold 5 and comes into contact with the fixed mold 5, the driving pin 32 is deeply fitted into the guide hole 31 as shown in FIG. When the movable mold 6 is moved to the left end of the holder fitting hole 16 and the movable mold 6 is moved away from the fixed mold 5, the driving pin 32 is moved away from the guide hole 31 as shown in FIG. The inclination angle and length of the guide hole 31 and drive pin 32 are set so that the holder 18 is moved to the right end of the holder fitting hole 16.

Next, the operation mode of the above embodiment will be explained.

First, when the movable mold 6 moves toward the fixed mold 5 and comes into contact with the fixed mold 5, the drive pins 32 and 37 of the drive devices 30 and 35 move into each guide hole, as shown in FIGS. 31 and 36.

As a result, each holder 18, 23 and therefore each valve body 19, 24 are moved to the left, and the left end of the upper valve body 19 fits into the middle part of the branch runner 8a, thereby opening the branch runner 8a. The left end of the lower valve body 24 reaches a position just before the middle part of the branch runner 9a, and the lower valve body 24 closes the branch runner 9a.
A will be communicated.

When hot water (molten metal) is injected from the sprue 13 in this state, this hot water is poured into each of the remaining cavities 9, 10, 11, except for one cavity 8, through the main runner 12, and into each of the branch runners 9a, It will be filled from 10a and 11a.

Next, when the movable mold 6 is moved away from the fixed mold 5 after the hot water has solidified, the drive pins 32 and 37 of the drive devices 30 and 35 move into each guide hole, as shown in FIGS. 3 and 4. Leave from 31 and 36.

As a result, each holder 18, 23 and therefore each valve body 19, 24 is moved to the right, and each of these valve bodies 1
The right ends of 9 and 24 will be retracted to the right from the branch runners 8a and 9a.

Next, a release pin (not shown) is operated to release the castings attached to the cavities 9 to 11 on the movable mold 6 side from the movable mold 6.

Next, if you want to use the cavity 8 and stop using the cavity 9, use the upper holder 18.
The collar 25 fitted into the threaded portion between the holder 23 and the valve body 19 is removed to reduce the amount of protrusion of the valve body 19, and instead the collar 25 is inserted into the threaded portion between the holder 23 and the valve body 24 on the lower side. The amount of protrusion of the valve body 24 is increased by inserting the valve body 24 into the valve body.

Then, when the movable mold 6 is moved to the fixed mold 5, each holder 18, 23 is moved to the left by the drive devices 30, 35 in the same manner as described above, and the valve body 19 on the upper side The valve body 24 on the lower side fits into the branch runner 9a and closes the branch runner 9a, thereby preventing the use of the cavity 9. can be stopped.

In addition, the present invention provides a cylinder mechanism that interlocks with the movable mold 6, and the valve body 1 is moved by this cylinder mechanism.
9 and 24 may be moved back and forth.

Further, only one runner closing device 15, 20 may be provided, for example, only the upper runner closing device 15 may be provided.

(Effects of the Invention) As is clear from the above description, according to the present invention,
Since the runners in the predetermined cavities are opened and closed by valve bodies that reciprocate in conjunction with the movable mold, it is possible to obtain the types of castings corresponding to the number of production, and when the castings are released from the molds, the valve bodies are opened and closed. Since the valve body is evacuated from the runner, wear and damage to the valve body can be prevented.

[Brief explanation of drawings]

Fig. 1 is a sectional front view of the main part showing the dividing plane of a movable mold showing an embodiment of the present invention, Fig. 2 is a corresponding sectional view thereof, and Fig. 3 is a sectional view of the movable mold in a state where the valve body is opened. A front view showing the dividing plane, Figure 4 is the -
5 is a cross-sectional side view of a main part showing a conventional metal mold apparatus, FIG. 6 is a cross-sectional view of the same, and FIG. 7 is a cross-sectional view of a main part at - of FIG. 6. 1: Mold mold device, 2: Base, 3: Fixed platen, 4: Movable platen, 5: Fixed mold, 6: Movable mold, 7: Reciprocating device, 8 to 11: Cavity, 8a to 11a: Branch runner , 8b, 9b: Locking recess, 15, 20: Runway blocking device, 16, 21: Holder fitting hole, 17, 22: Valve body fitting hole, 18, 2
3: Holder, 19, 24: Valve body, 25: Collar,
30, 35: Drive device, 31, 36: Guide hole,
32, 37: Drive pin.

Claims (1)

[Claims] 1. A fixed mold and a movable mold that move toward and away from the fixed mold are provided, and a plurality of cavities and a runner connecting the cavities to a sprue are formed at the joint surface of the fixed mold and the movable mold. In the metal mold apparatus, a valve is provided at a mating surface of one of the fixed mold and the movable mold, and advances and retreats along the mating surface to block and communicate a part of the runner. 1. A runner blocker for a metal molding apparatus, characterized in that the valve body is provided with a drive device that moves the valve body forward and backward in conjunction with the movable mold that moves toward and away from the fixed mold.