JPH10175054A - Die for forming semi-molten metal and formation using this - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the production of a product having good quality by preventing the invasion of oxide film developed on the surface of a semi-molten metal material into a product part cavity. SOLUTION: The forming die 1 for semi-molten metal is provided with an injection sleeve 2, plunger 3, sliding die 12 and dividing flow element 7. The inner diameter of the sliding die 12 is smaller than the inner diameter of the injection sleeve 2. The dividing flow element 7 has a projection part 11 and an opening hole part 13 communicated with a runner 8 and 9 and the cavity 10, is arranged at the upper part of the projection part 11. This forming method uses the forming die 1 to eject the semi-molten metal 4 to the dividing flow element 7 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die for injecting a semi-molten light alloy material into an injection sleeve and injecting it into a cavity through a runner and a sprue by an injection plunger. More specifically, a molding die capable of preventing an oxide film formed on a surface of a metal material from entering a product cavity when molding a semi-molten metal material, and a molding using the same. About the method.

[0002]

2. Description of the Related Art Conventionally, various products have been formed using semi-molten metal. In such forming, first, the solid metal material is heated to a semi-molten state by heating, but when heated to such a temperature, an oxide film is formed on the surface of the material. There was a problem that the product quality was degraded after being carried into the product part cavity.

[0003] In order to prevent an oxide film generated on the surface of the material during molding from invading into the product cavity, for example, molding using a metal mold as described in Japanese Patent Application Laid-Open No. 7-16813. Has been done. In such a molding method, an indicating surface which abuts when a material is pressed by a punch is an inclined surface inclined toward an opening surface of a flow path, and a bent portion is provided in the middle of the flow path, and the inclined surface and the inner peripheral surface of the runner are provided. By adhering the oxide film, the oxide film is prevented from being mixed into the product.

[0004]

However, in such a conventional molding die and molding method, an oxide film generated on the front end surface of the extruded material is trapped on the wall surface or the bent surface, In the case of performing the injection, there is a problem that the captured oxide film is mixed into the cavity of the product part due to the flow of the semi-molten metal material, thereby deteriorating the quality of the obtained product.

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to allow an oxide film generated on the surface of a semi-molten metal material to penetrate into a product part cavity. It is an object of the present invention to provide a mold for a semi-molten metal and a molding method using the same, which can prevent the occurrence of the problem and enable the production of a good quality product.

[0006]

The inventor of the present invention has conducted intensive studies to solve the above-mentioned problems, and as a result, found that the above-mentioned problems can be solved by installing a slide type and a shunt having a specific shape. The invention has been completed.

That is, the mold for forming a semi-molten metal of the present invention comprises:
An injection sleeve, a plunger installed in the injection sleeve and capable of moving back and forth in the axial direction of the sleeve, a product portion cavity, a shunt disposed on a tip portion or an extension of the tip portion of the injection sleeve, and the injection sleeve. And a slide die installed between the splitter side and the splitter side, wherein the slide die has an inner diameter smaller than the inner diameter of the injection sleeve, A projection is provided on a surface facing the injection sleeve, and a runner, a sprue, and an opening communicating with the product part cavity are provided outside the projection.

[0008] A molding method of the present invention is characterized by using the above-mentioned molding die.

[0009]

In the mold for forming a semi-molten metal according to the present invention, the projections provided on the surfaces of the slide mold and the shunt which oppose the sleeve are each provided with an oxide film formed on the surface of the semi-molten metal material during injection molding. Has the effect of preventing intrusion into the product cavity. That is, the oxide film generated on the side surface and the tip portion of the semi-molten metal material, in the process of pressing the semi-molten metal material by the injection plunger during injection molding, the slide mold provided between the injection sleeve and the shunt. It is removed by a protrusion provided on the sleeve facing surface of the shunt.

Further, in the molding method of the present invention, a semi-molten metal heated and heated is injected into an injection sleeve, and the semi-molten metal material is extruded in a shunt direction by an injection plunger. Is brought into contact with the slide mold in the injection sleeve, and further extruded in the direction of the shunt, whereby the oxide film on the side surface of the semi-molten metal material is removed. On the other hand, the oxide film generated at the tip of the semi-molten metal material is pushed out by the injection plunger and hits the tip of the shunt, which is the traveling direction, and is removed by the projection provided around the opening leading to the runner in the shunt. Is done.

According to this projection, even during the step of filling the runner with the semi-molten metal material, the oxide film is prevented from being dragged into the sleeve by the flow of the semi-molten metal material, and the oxide film is prevented from flowing into the runner. Can also be prevented from flowing into the product cavity. Therefore, a semi-molten metal material without an oxide film can be poured into the product part cavity.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a mold for forming a semi-molten metal of the present invention will be described in detail. As described above, this molding die has a structure including an injection sleeve, a plunger, a shunt having a specific projection, and a slide mold of a specific shape provided between the injection sleeve and the shunt. Have. This mold may be either a vertical type or a horizontal type.

The inside diameter of the slide mold must be smaller than the inside diameter of the injection sleeve in order to remove an oxide film generated on the side surface of the molten metal material. Further, the shunt is disposed on the distal end portion or an extension of the distal end portion of the injection sleeve, and has a specific projection on a surface facing the injection sleeve.

[0014] Here, it is preferable that the installation position of the projection be on the above-mentioned opposing surface and adjacent to the opening communicating with the gate, the runner and the cavity. In other words, the opening may be provided outside the projection. More specifically, when the main mold is of a horizontal type, the protrusion may be provided below the runner opening provided above the shunt.

The planar shape of the projection is not particularly limited. However, taking into account the shape of the molten metal material,
It is preferable that the protrusion is arc-shaped or straight, and the length of the protrusion is preferably equal to or larger than the width of the opening in order to surely remove the oxide film at the front end of the material.

[0016]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. (Embodiment 1) FIG. 1 is a sectional view showing an embodiment of a mold for forming a semi-molten metal according to the present invention. First, the configuration will be described.
Reference numeral 1 denotes a mold, and an injection plunger 3 for horizontal clamping horizontal injection is installed so as to be in contact with the inside of the injection sleeve 2. In addition, a slide die 12 that forms a cavity having an inner diameter smaller than the inner diameter of the injection sleeve 2 is installed at the tip of the injection sleeve 2, and a shunt 7 is installed further forward.

An opening 13 to a runner 8 serving as a flow path of the semi-molten metal material 4 to the product cavity 10 is provided above the splitter 7. Is provided with a projection 11. 4 and 5
As shown in (1), the width of the projection 11 is formed to be longer than the width of the opening 8, and the shape thereof is preferably a straight line or an arc.

(Example 2) Using the mold of Example 1, molding was performed as follows. First, a semi-molten aluminum alloy 4 heated and heated was injected into the injection sleeve 2, and the aluminum alloy 4 was extruded toward the shunt 7 by the injection plunger 3. The plunger speed at this time was appropriately set. The extruded aluminum alloy 4
Was covered with an oxide film 5 on the side surface and an oxide film 6 on the tip portion generated during heating and heating.

FIG. 2 is a sectional view showing a state in which the tip of the aluminum alloy 4 reaches the slide mold 12 and the tip of the aluminum alloy 4 is pushed out to the shunt 7 by the injection plunger 3. As shown in FIG. 2, the provision of the slide die 12 hinders the progress of the oxide film 5 on the side surface of the aluminum alloy 4, and does not reach the shunt 7.
Further, the oxide film 6 at the tip of the aluminum alloy 4 was settled under the projection 11 provided below the opening 13 of the shunt 7 to the runner 8.

FIG. 3 is a cross-sectional view showing a state in which the semi-molten aluminum alloy 4 is further extruded by the injection plunger 3 from the state of FIG. 2. When the plunger 3 is further extruded from the state of FIG. As shown in the figure, the oxide film 6 at the tip of the aluminum alloy 4 was blocked by the projection 11, and the product cavity 10 was filled with the aluminum alloy without an oxide film.

[0021]

As described above, according to the present invention, since the slide die and the shunt of a specific shape are provided, the oxide film generated on the surface of the semi-molten metal material enters the product part cavity. It is possible to provide a mold for a semi-molten metal, which can prevent intrusion, and enable production of a high quality product, and a molding method using the same.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a molding die of the present invention.

FIG. 2 is an explanatory sectional view showing a molding step using the mold shown in FIG. 1;

FIG. 3 is an explanatory sectional view showing a molding step using the mold shown in FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Die 2 Injection sleeve 3 Injection plunger 4 Semi-molten metal material 5 Oxide film on the side of material 6 Oxide film on material tip 7 Shunt piece 8 Runner 9 Sluice 10 Product cavity 11 Protrusion 12 Slide mold 13 Opening

Claims (5)

[Claims] 1. An injection sleeve, a plunger installed in the injection sleeve and capable of moving back and forth in the axial direction of the sleeve, a product portion cavity, and a shunt disposed on a tip portion or an extension of the tip portion of the injection sleeve. And a slide type installed between the injection sleeve and the shunt side,
Wherein the slide die has an inner diameter smaller than the inner diameter of the injection sleeve, and a protrusion is provided on a surface of the shunt which faces the injection sleeve, and A mold for forming a semi-molten metal, which is provided with a runner, a gate and an opening communicating with the product part cavity on the outside. 2. A mold for forming a semi-molten metal according to claim 1, wherein the shape of the projection of the shunt is arc-shaped or linear and the length thereof is equal to or greater than the width of the opening. . 3. A method for molding a semi-molten metal, comprising using the molding die according to claim 1. 4. A semi-molten metal heated and heated is injected into the injection sleeve, and the semi-molten metal is extruded in the direction of the shunt by the injection plunger. 4. The method for forming a semi-molten metal according to claim 3, wherein the oxide film on the side surface of the semi-molten metal is removed by bringing the semi-molten metal into contact with a slide die and extruding the metal in the direction of the shunt. 5. The method according to claim 1, wherein the tip of the semi-molten metal is brought into contact with the surface of the shunt, and an oxide film at the tip of the semi-molten metal is removed by a projection provided below the opening. The method for forming a semi-molten metal according to claim 4.