JPH0230131Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a die casting mold device used in a horizontal die casting in which molten metal is injected into a cylinder from the side by advancing a plunger.

(Prior Art) Conventionally, there is a die-casting mold apparatus shown in FIG. 1, for example, which uses a flow divider to guide molten metal from a cylinder to a mold product part.

In FIG. 1, 1 is a fixed mold, 2 is a movable mold, and a cylinder 3 is provided with a plunger (not shown) slidably from the lateral direction at the sprue on the side of the fixed mold 1.
is installed, and a flow divider 5 is installed on the side of the movable mold 2 facing the opening of the cylinder 3 to guide the molten metal from the lateral direction to the product part 4 formed above. 6, the molten metal press-fitted from the cylinder 3 is fed into the product section 4. Note that 7 is an overflow part.

However, in the case of such a conventional die casting mold device using a flow splitter, since the flow splitter 5 has a flat surface 8 that is perpendicular to the cylinder 3, the molten metal poured into the cylinder 3 When injected, the liquid collides with the flat surface 8 of the flow divider 5, causing turbulence and filling the product part 4 while entraining air, resulting in the problem that cavities are likely to occur.

In addition, pressure loss increases due to turbulent flow, the pressure applied to the product part 4 decreases, the pressure transmission speed also slows down, and there is a problem that shrinkage cavities are likely to occur due to insufficient replenishment of molten metal during solidification.

(Purpose of the invention) The present invention was made in view of the above-mentioned conventional problems.By creating a shunt structure that does not disturb the flow of molten metal, it is possible to prevent the formation of cavities due to air entrainment and shrinkage cavities due to pressure loss. It is an object of the present invention to provide a die-casting mold device that prevents the occurrence of damage.

(Structure of the invention) In order to achieve this purpose, the present invention provides a stepped part that engages the flow divider at the end of the cylinder that is laterally attached to the sprue on the fixed mold side, and also provides a stepped part that engages the flow splitter. The flow divider on the fixed mold side is provided with a guide surface that forms part of a runner that smoothly extends from the cylinder hole toward the product part.

(Embodiment) FIG. 2 is a cross section showing an embodiment of the present invention.

First, to explain the structure, 1 is a fixed mold, 2 is a movable mold, and a cylinder 3 equipped with a plunger (not shown) is slidable from the lateral direction with respect to a sprue provided on the fixed mold 1 side. installed, cylinder 3
A runner 14 is formed upward from the sprue where the mold is attached, and a product part 4 having a predetermined product shape and an overflow part 7 are formed around the mold mating surface. The cylinder 3 mounted on the fixed mold 1 side has a stepped portion 10 for engaging a flow divider approximately half around the lower side of the opening.

Reference numeral 12 denotes a flow divider, which is installed at a position opposite to the opening of the cylinder 3 on the side of the movable mold 2, and the lower end of the flow divider 12 is engaged with the stepped portion 10 of the cylinder 3. In this state, the cylinder The tip of the movable mold 2 is positioned by being in contact with the abutting surface of the movable mold 2. Furthermore, the flow divider 12 is connected to a runner 1 which is smoothly connected from the cylinder hole of the cylinder 3 toward the product section 4.
4.

FIG. 3 shows the flow divider 12 used in the embodiment shown in FIG.
It has a cylinder engaging part 18 that engages with the step part 10 of the cylinder 3, and the inner circumference 20 of the cylinder engaging part 18 is
and therefore the cylinder 3 has a shape corresponding to the inner diameter of the cylinder
When the flow divider 12 is engaged with the stepped portion 10 of the cylinder engaging portion 18, a smooth runner 14 from the cylinder hole to the product portion 4 is formed without forming a flat surface that disturbs the flow of the molten metal. Has a shunt structure.

Next, to explain the operation of the above embodiment, the molten metal is injected into the cylinder 3, the molten metal in the cylinder 3 is pressurized by the advance of the plunger (not shown), and the molten metal is passed through the runner 14 equipped with the flow divider 12 into the product. Press fit into part 4. When the molten metal is press-fitted into the product part 4, there is no flat surface between the flow divider 12 and the cylinder 3 that is perpendicular to the flow direction of the molten metal and that would impede the flow of the molten metal. When passing through the surface 16, the flow of the molten metal is not disturbed in any way, and the molten metal is smoothly poured into the product portion 4 without entrainment of air due to turbulence. Furthermore, since the flow divider 12 has a guide surface 16 that minimizes the pressure loss of the molten metal, the pressure of the molten metal pressurized by the cylinder 3 due to the advancement of the plunger is applied to the product part 4 almost as is, and the pressure loss of the molten metal is applied to the product part 4 as it is. Since there is no pressure loss to the injected molten metal,
Solidification progresses in the product part 4 while being supplied with sufficient molten metal, and thus the generation of cavities and sink marks due to air entrainment when the molten metal is poured into the product part 4 can be reliably prevented.

(Effects of the invention) As explained above, the invention has a divided structure into a fixed mold and a movable mold, and a plunger is slidably provided in the sprue on the fixed mold side from the lateral direction. In a die gas mold device, a cylinder is installed and a shunt is provided on the movable mold side facing the cylinder opening to guide the molten metal to the mold product.The shunt is engaged approximately halfway around the cylinder opening. In addition to forming a mating step, the flow divider that engages with the cylinder step when the molds are butted has a guide surface that forms a part of a sprue that smoothly extends from the cylinder hole toward the product part. As a result, the molten metal is quietly filled into the product part without causing turbulence when passing through the flow divider, minimizing air entrainment and preventing the formation of cavities.The cylinder also has a small pressure loss. The pressure of the molten metal is quickly transmitted to the product part, and solidification of the product part is carried out while receiving molten metal replenishment due to sufficient pressure transmission, which has the effect of making it possible to obtain die castings without defects such as shrinkage cavities. can get.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a conventional example, Fig. 2 is a cross-sectional view showing an embodiment of the present invention, and Fig. 3 is a perspective view showing the shunt in the embodiment shown in Fig. 2. . 1...Fixed mold, 2...Movable mold, 3...Cylinder, 4...Product section, 7...Overflow section,
10... step part, 13... diverter, 14... runner,
16... Guide surface, 18... Cylinder engagement portion.

Claims (1)

[Claim for Utility Model Registration] It has a divided structure into a fixed mold and a movable mold, and a cylinder with a plunger slidable from the side is attached to the sprue on the fixed mold side, and the cylinder opening A die-casting mold device is provided with a flow divider for guiding the molten metal to the mold product part on the side of the movable mold opposite to the movable mold part. A die-casting mold apparatus characterized in that the flow divider engaged with the cylinder step portion is provided with a guide surface forming a part of a runner that smoothly connects the cylinder hole toward the product part.