JPH0314542B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a casting mold apparatus, particularly to a mold apparatus suitable for use in low pressure casting.

An example of a conventional mold apparatus of this type for producing a plurality of cast products in one shot is the one shown in FIG. 1, which is an example of a low pressure casting mold apparatus.

In the figure, 1 indicates an upper fixed plate, 2 indicates a lower fixed plate, and 3 indicates a movable plate. This movable plate 3 is driven up and down by an elevating cylinder 4 attached to the upper fixed plate 1, and this elevating movement of the movable plate 3 is caused by guide rods 5 and 5 projecting upward from the movable plate 3 and penetrating into the upper fixed plate 1. It is guided by a tie bar 6 that penetrates the side end of the movable plate 3 and connects the upper fixed plate 1 and the lower fixed plate 2.

A single upper mold 8 is connected to the movable plate 3 via a spacer 7, and this single upper mold has a contour corresponding to the upper surface shape of a plurality of, in this example two, cast products. .

The lower fixing plate 2 is also attached to a fixing lower die 9 having a contour corresponding to the lower surface shape of the two cast products; It has a pouring port 10 for communicating the crucible disposed below the mold cavity with the mold cavity. Here, pour spout 1
0 is connected to the crucible via feeder 11 and stroke 12.

Furthermore, in order to form the above-mentioned mold cavity, it has a contour corresponding to the side shape of the cast product,
A horizontal mold 13 that is driven horizontally forward and backward with respect to the upper and lower molds 8 and 9 is disposed, and as shown in the example, these horizontal molds 13 are in the advanced state, the upper mold 8 is in the lowered state, and the fixed lower mold is Mold cavity 1 by mold 9
4 is formed. In this example, the horizontal cylinder 15 drives the horizontal mold 13 forward and backward.

Here, since the two cast products in this example are an automobile engine and a cylinder head, two pairs of port cores 16, 17 and a jacket core 18 are arranged in the mold cavity 14, respectively. In addition, when each cast product is released from the upper mold 8, a placing core 19 is arranged to prevent so-called reverse tapered portions existing in adjacent portions from interfering with the release.

In the figure, 20 indicates a plurality of ejector pins penetrating through the upper die 8 in order to release the cast product from the upper die 8, and 21 indicates a plurality of ejector pins between the upper die 8 and the movable plate 3. Connection plates that connect these ejector pins 20 together are shown, and 22 is
In order to lower the ejector pin 20 relative to the upper mold 8 and release the cast product from the upper mold 8, an ejector pin is shown that protrudes downward from the upper fixing plate 1, and this ejector pin 22 As the movable plate 3 rises, the connecting plate 21 and the ejector pin 20 pass through the through hole 23 provided there.
restrain the rise of.

When casting a cylinder head using such a mold device, a mold cavity 14 as shown in the figure is formed, and various cores 16, 17, and 18 are arranged within the mold cavity 14. ,
The molten metal in the crucible is poured into it through the stalk 12, feeder 11 and pouring spout 10. After the molten metal has solidified, each horizontal mold 13 is first opened by the horizontal cylinder 15, and then the movable plate 3 and the upper mold 8 are opened by the lifting cylinder 4.
to rise. At this time, the cylinder head as a cast product is lifted while attached to the upper die 8, so when it rises by a predetermined amount, the ejector pin 22 and the connecting plate 23 come into contact and the ejector pin From restraining the rise of 20, the second
As shown in the figure, the two cast products 24 are released from the upper mold 8.

However, in such a conventional technique, a core 19 is placed in the reverse taper portion of a plurality of cast products that are cast in one shot so that the reverse taper portions present in adjacent portions do not interfere with mold release. Place the
Since the placed core 19 is removed after demolding, many man-hours are required to manufacture, install, and recover the placed core, resulting in poor work efficiency and increased product cost.

The present invention provides a casting mold device that advantageously solves the above-mentioned problems of the prior art, and in particular, this casting mold device is capable of forming a plurality of upper molds according to the number of castings in one shot. A core corresponding to a conventional placing core is connected to a movable plate between these upper molds, and each upper mold is horizontally movable in a direction away from the core.

In the casting mold device of the present invention, the core is connected to the movable plate and constitutes a part of the mold.
The manufacturing and installation man-hours required in the prior art are completely unnecessary. Moreover, since the plurality of upper molds are horizontally moved in the direction away from the core, the core does not interfere with the release of the cast product.
The man-hours required to recover the core from the cast product are also eliminated.

The present invention will be explained below based on the drawings.

FIG. 3 is a partial sectional view showing an embodiment of the present invention, and the same parts as in FIGS. 1 and 2 are designated by the same numbers.

Here, the upper plate 31 is attached to the movable plate 3.
A core 3 is attached to the lower end of the rod 32 that protrudes downward from the center of the upper plate 31.
3 provides an indirect connection between the core 33 and the movable plate 3.

In addition, two slide plates 34 are arranged on both sides of the core 33 and thus the rod 32, and these slide plates 34 are attached to the side ends of the upper plate 31, as is clear from the cross-sectional view shown in FIG. It is supported slidably in the horizontal direction by an L-shaped support member 35 fixed to. Upper molds 37 are respectively fixed to these slide plates 34 via spacers 36, and these upper molds 37 are
A cylinder 38 connected to the spacer 36 enables horizontal drive, here particularly drive in a direction away from the core 33.

Each upper mold 37 is also provided with a plurality of ejector pins 39 that vertically penetrate through the upper mold 37 and are disposed so as to be relatively displaceable with respect to the upper mold 37.
7 are integrally connected by a connecting plate 40.

In addition, in the figure, 41 is a through hole provided in the plate 31 that is continuous with the through hole 23 of the movable plate 3, and 42 is a through hole provided in the slide plate 34, when the upper die 37 is separated from the core 33. 2 shows through holes aligned with through holes 23 and 41, respectively, and these through holes 23, 41, and 42 are
4 is released from the upper mold 37, the extrusion pin 22 is allowed to enter there.

According to such a casting mold device, the mold cavity 14 is formed by the two upper molds 37, the lower mold 9, the horizontal mold 13, and the core 33, so that two pairs of ports are provided inside the mold cavity 14. Casting is performed by arranging the cores 16, 17 and the jacket core 18, and pouring the molten metal in the crucible therein in the same manner as described above. After the molten metal in the mold cavity 14 has solidified, first open the horizontal mold 13,
Next, both upper molds 37 and the core 33 are raised based on the operation of the lifting cylinder 4. As a result, the cast product 24 also rises together with the upper mold 37, so in order to release the cast product 24 from the upper mold 37, the two upper molds 37 are moved sequentially or simultaneously as shown in FIG. , by sliding the slide plate 34 with respect to the support member 35 based on the operation of the cylinder 38, the ejector pin 22 is horizontally separated from the core 33, and after this separation, the ejector pin 22 is moved to the connecting plate 40.
As shown in FIG. 6, each cast product 24 is separated from the upper die 37 by the ejector pin 39.

Therefore, although the core 33 is fixed to the movable plate 3 and forms part of the mold, the cast product 24 can be easily and reliably released from the mold. Compared to the case where a separate core is placed within the mold cavity 14, the advantage is that the man-hours for manufacturing, installing and recovering the core are completely eliminated. The present invention has been described above based on the illustrated example, but for example, if the upper plate 31 provided with the core 33 is made horizontally movable with respect to the movable plate 3, three or more cast products 24 can be moved in one shot. The cylinders 4, 15, and 38 may be used as reciprocating driving means such as gears or other reciprocating driving means.

According to this invention, in particular, there are a plurality of upper molds according to the casting quantity of one shot, the core is connected to a movable plate between these upper molds, and each upper mold is moved in the direction away from the core. By making it horizontally movable, it becomes unnecessary to arrange the core inside the mold cavity, thereby improving casting work efficiency and reducing product costs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional example, FIG. 2 is a sectional view showing a mold release state of a cast product in the apparatus shown in FIG. 1, FIG. 3 is a partial sectional view showing an embodiment of the present invention, and FIG. The figure is a sectional view taken along the - line in FIG. 3, and FIGS. 5 and 6 are sectional views showing the mold release process in the apparatus shown in FIGS. 3 and 4, respectively. 3...Movable plate, 4...Elevating cylinder,
9...Lower mold, 10...Pouring spout, 13...Horizontal type, 1
4... Mold cavity, 16, 17... Port core, 18... Jacket core, 24... Casting product,
31... Upper plate, 32... Rod, 33...
... core, 34 ... slide plate, 35 ... support member, 37 ... upper mold, 38 ... cylinder.

Claims (1)

[Claims] 1. An upper mold 37 connected to a movable plate 3 and driven up and down, a fixed lower mold 9 having a pouring spout 10,
In a casting mold device comprising a horizontal mold 13 that moves horizontally forward and backward with respect to the upper and lower molds 37 and 9, the upper mold 37 is provided in a plurality according to the casting quantity of one shot, and these upper molds In between, the core 33 is connected to the movable plate 3, and each upper mold 37 is connected to the movable plate 3.
A casting mold device, characterized in that it can be horizontally moved in a direction away from a core 33.