JPH0562013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a casting mold device mainly used for low pressure casting.

(Prior art) As this type of casting mold device,
As described in Publication No. 9567, between the number of upper molds corresponding to the casting quantity of one shot, a core provided in order to prevent the reverse tapered part of the product from interfering with mold release at the time of ejection is fixed, A structure in which the upper mold moves horizontally in a direction away from the core during ejection has already been proposed.

(Problems to be Solved by the Invention) The casting mold device configured as in the above-mentioned known technology requires a drive device to horizontally move the upper mold during ejection, which makes the device complicated and , it is necessary to control the timing of the eject operation and the movement of the upper die.

Furthermore, the upper die, which is a relatively large member, must be moved back and forth in the horizontal direction for each shot, which poses a problem in shortening the casting cycle time.

The present invention has been made in view of the above points, and
A center slide core that can be moved horizontally during ejection is interposed between the plurality of upper molds, and the center slide core is moved away from the upper mold during ejection to facilitate product release. The purpose of this is to make the device more compact and shorten the casting cycle time.

(Means for Solving the Problems) In the present invention, as a means for solving the above problems, an upper mold is connected to a movable plate and driven up and down, and is formed in a plurality according to the number of castings in one shot. and a fixed lower mold having a pouring port, a center slide core is provided between the upper mold and supported to be horizontally movable with respect to the movable plate, and a center slide core is provided between the upper mold and is provided with a slide guide that guides the center slide core in a direction away from the upper die in the eject operation direction.

(Function) In the present invention, the following effects can be obtained by the above means.

That is, when ejecting a product, at the same time as the product is released from the upper mold, a center slide core provided between the upper molds is guided by a slide guide and horizontally moved in a direction away from the upper mold. Therefore, since the upper mold and the center slide core operate simultaneously during ejection and return after ejection, the product release operation and center slide core return operation are extremely simplified, and the casting cycle time is greatly reduced. It is shortened to .

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the casting mold apparatus of this embodiment includes a lower fixing plate 2, an upper fixing plate 1 connected to the lower fixing plate 2 via tie bars 5, 5, and so on. It is provided with a movable plate 3 that is driven up and down with respect to an upper fixed plate 1 by lifting cylinders 4, 4, . . .

The vertical movement of the movable plate 3 is guided by tie bars 5, 5, . . . passing through the side ends of the movable plate 3.

On the lower surface of the movable plate 3, upper molds 6, 6 are connected at a predetermined interval, the number of which corresponds to the quantity of one shot to be cast (two in this embodiment).

Each of the upper molds 6, 6 has a contour corresponding to the upper surface shape of the two castings (in this example, cylinder heads).

On the other hand, a fixed lower die 7 having a contour corresponding to the lower surface shape of the two cast products (i.e. cylinder head) is attached to the lower fixing plate 2. It has a pouring port 8 for communicating a crucible disposed below the fixed plate 2 and a mold cavity 10 formed between the upper and lower molds 6 and 7.

In addition, in order to form the mold cavity 10, it has a contour corresponding to the shape of one side of the cast product (i.e., cylinder head), and is connected to the upper and lower molds 6, 7 by horizontal cylinders 11, 11. Side slide cores 9, 9 which are horizontally driven forward and backward are disposed.

Further, a pair of center slide cores 14, 14 corresponding to the shape of the other side of the cast product (ie, cylinder head) are horizontally movably provided between the upper molds 6, 6.

As shown in FIG. 1, a desired shape is formed by the side slide cores 9, 9 in the advanced state, the upper mold 6 and center slide cores 14, 14 in the lowered state, and the fixed lower mold 7. Mold cavity 1
0 and 10 are formed. Reference numeral 12 indicates a port core, and 13 indicates a jacket core.

The center slide cores 14, 14 are supported by a support plate 1 that rises together with the movable plate 3 when ascending, and descends separately from the movable plate 3 when descending.
7, guide members 22, 22 (see Fig. 4)
It is supported so that it can move horizontally. The support plate 17 is connected to a slide pressing plate 19 via connecting pins 18, 18 extending upwardly through the movable plate 3, and the movement of the movable plate 3 by the action of a downward force on the sliding pressing plate 19. It is designed so that it can be lowered so as to be separated from it.

Eject pins 15, 15, . . . extend upwardly through the movable plate 3 and the upper mold 6, and have their upper ends connected to the eject plate 16, and these eject pins 15, 15, .
The mold release of the cast product is brought about by this method.

The eject plate 16 and the slide press plate 19 are arranged to move the upper fixed plate 1 as the movable plate 3 is raised by driving the lifting cylinder 4
It is configured so that it can be simultaneously brought into contact with extrusion pins 20, 20 vertically installed. After the ejector pins 20, 20 come into contact with the eject plate 16 and the slide press plate 19, the ejector pins 20, 20
Eject pin 1 due to upward movement restriction by 0,20
5, 15... are ejected from the upper die 6, and at the same time,
The support plate 17 is separated from the movable plate 3. Reference numeral 24 is a spring for returning the eject pin.

The movable plate 3 has slide guides 2 that are slidably in contact with both ends of the center slide core 14 and guide the center slide core 14 away from the upper mold 6 in the ejecting direction.
1 and 21 are provided (see Fig. 4). The slide guide 21 is constructed by forming an inclined guide surface 21b on one side of a guide piece 21a fixed to the lower surface of the movable plate 3, the inclined guide surface 21b slidingly contacting the end of the center slide core 14.

The casting mold device configured as described above operates as follows.

First, as shown in FIG. 1, two upper molds 6, 6,
Fixed lower mold 7, two side slide cores 9, 9,
After forming the mold cavities 10, 10 with the two center slide cores 14, 14 and arranging the port core 12 and the jacket core 13 therein, the mold cavities 10, 10 are inserted into the crucible. Casting is performed by pouring the molten metal from the pouring port 8. And mold cavity 10,
After the molten metal in 10 has solidified, as shown in FIG. 2, the horizontal cylinders 11, 11 are driven to move the side slide cores 9, 9 backward, and then the lifting cylinders 4, 4 are driven, to raise the movable plate 3. Then, as the movable plate 3 rises, the upper molds 6, 6 and the center slide core 14,
14 is raised together with the casting 23. When the movable plate 3 is raised by a predetermined amount, the push-out pins 20 of the upper fixed plate 1,
20... comes into contact with the eject plate 16 and the slide press plate 19, and the upward movement of the eject plate 16 and the slide press plate 19 is restricted. Furthermore, when the movable plate 3 is raised, the eject plate 16
Since the upward movement of the slide press plate 19 is restricted, the eject pins 15, 15, . . .
6 and at the same time, the support plate 17 is separated from the movable plate 3. At this time,
Center slide cores 14, 14 supported horizontally movably on support plate 17 are guided by slide guides 21, 21, . . . and moved in a direction away from upper molds 6, 6 (see FIG. 3). In other words, the cast product 23 has the eject pins 15, 15...
It can be released from the mold extremely easily by protruding.

After the cast product 23 has been released from the mold, when the movable plate 3 is lowered again, the center slide cores 14, 14 are also guided by the slide guides 21, 21 as the upper molds 6, 6 are lowered, and automatically return to their original state. By returning to the position and advancing the side slide cores 9, 9, mold cavities 10, 10 ready for the next shot can be formed.

As mentioned above, when the casting mold apparatus of this embodiment is used, the center slide cores 14, 14 can be released from the mold in conjunction with the lifting and lowering operation of the movable plate 3, and the center slide core control can be extremely easily performed. In addition to this, the equipment can be made more compact and the casting cycle time can be shortened.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that the number of upper molds, the driving method of the movable plate, etc. can be changed as appropriate within the scope of the invention.

(Effects of the Invention) As described above, according to the present invention, in a casting mold device configured to obtain a plurality of cast products in one shot, the center slide core provided between the upper molds can be horizontally moved. None, and since the slide guide guides the center slide core in the direction away from the upper die in the direction of the eject operation, the center slide core can be released from the mold in conjunction with the lifting and lowering operations of the movable plate. This has the excellent effect of making control extremely simple and making the device more compact.

Furthermore, since the center slide core can be easily controlled, mold clamping and mold release can be performed quickly, which has the effect of greatly shortening the casting cycle time.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a casting mold device according to an embodiment of the present invention, FIG.
The figure is a cross-sectional view showing the state of the casting mold apparatus according to the embodiment of the present invention at the time of mold release, and FIG. 4 is a partial cross-sectional view taken from - in FIG. 1. 3...Movable plate, 6...Upper mold, 7...Fixed lower mold, 8...Pouring spout, 14...Center slide, 21...Slide guide.

Claims (1)

[Claims] 1. It is equipped with a plurality of upper molds connected to a movable plate and driven up and down according to the number of casts in one shot, and a fixed lower mold having a pouring port,
A center slide core supported horizontally movably with respect to the movable plate is provided between the upper molds, and the movable plate has a center slide core that guides the center slide core in a direction away from the upper mold in the ejecting direction. A casting mold device, characterized in that it is provided with a slide guide.