JPS61253156A - Production of aluminum molding - Google Patents

Abstract

PURPOSE:To obtain a prescribed molding by attaching a stationary die and movable die forming a cavity via a shear plate to the container end of an extruder and extruding at hot an aluminum material loaded in the container into the cavity. CONSTITUTION:The shear plate 3, the stationary die 4 and the movable die 5 are installed to the front face of the container 2 and thereafter a preheated billet as an aluminum alloy material B is loaded into the container 2. The die temp. and container temp. are adjusted to the prescribed hot extrusion temp. conditions and a ram 8 is advanced to extrude the alloy material B through a gate 6 by which the material is injected and packed into the cavity 7 of the dies 4, 5. The extruded metal is held in the sure pressed state for the prescribed time upon completion of the injection cycle. The plate 3 is thereafter actuated to cut away an excess runner part C and in succession, the movable die 5 is opened and the prescribed molding A is taken out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to unit block aluminum molded products used, for example, in various mechanical parts, structural parts, etc., and particularly to aluminum molded products made of high-strength aluminum alloy and having relatively complex shapes. This invention relates to a manufacturing method using an injection molding method using an extruder, which is suitable for manufacturing aluminum molded products.

BACKGROUND ART Conventionally, molded products such as various mechanical parts made of wear-resistant high-strength aluminum alloys have generally been manufactured by casting methods (including die casting) or forging 21. However, in general, when using the casting method, it is not only difficult to cast high-strength aluminum alloys, but also when the shape of the molded product is complex, the molten metal may not have sufficient coverage. However, it is difficult to obtain an accurate product shape. On the other hand, even when using the forging method, the more complex the shape of the molded product, the more times the forging operation must be repeated, which is inefficient and requires It was difficult to mold.

In view of the above-mentioned problems, the present invention has been developed so that the formability is not influenced by the type of aluminum alloy material.
Therefore, it is an object of the present invention to provide a simple forming means that can easily form even high-strength aluminum alloys without any trouble, and that can also finish molded products of complex shapes with high quality in a single forming operation. It was made for the purpose of

As a means to solve the problems, the present invention utilizes an extruder equipped with a large hydraulic or hydraulic cylinder, which is used in existing aluminum alloy extrusion-like manufacturing, for the above purpose. However, by making slight modifications and attaching auxiliary equipment to this and performing a molding method similar to the injection molding method, the desired molded product is manufactured on Saturdays and Sundays.

That is, in the present invention, a fixed mold and a movable mold forming a cavity are attached to the tip of a container of an extruder used for extruding aluminum alloy through a movable shear plate that constitutes a gate, and the container is The gist of this invention is a method for producing an aluminum molded product, which is characterized by hot extruding an aluminum alloy material loaded into the cavity and then indexing it into the cavity to form a predetermined molded product.

This will be explained in more detail based on the attached drawings as follows.

First, as a preparatory step, as shown in Figure 1, a movable shear plate (3) is attached to the front end of the container (2) of the aluminum alloy extruder (1) in place of the extrusion die, and further A fixed mold (4) and a movable mold (5) are installed and equipped. The shear plate (3) forms a gate (6) through which the aluminum alloy material is injected during molding, and after molding is completed, the excess runner portion (C) of the material alloy remaining in the gate (6) is transferred to the molded product (A). > and the alloy material (B) in the container (2), and performs the necessary operations for that purpose.Both the fixed and movable molds (4) and (5) are Shah Plate (
A molding cavity (7) is formed which communicates with the gate (6) formed by 3), and is equipped with air handling for discharging air replacing the alloy material during molding. The above shear plate (3) and both molds (
4) After attaching (5) to the front surface of the container (2), load the preheated billet as the aluminum alloy material (B) into the container (2).

Then, with the mold temperature and container temperature adjusted to predetermined hot extrusion temperature conditions, the ram (8) is advanced, the alloy material (B) is extruded through the gate (6), and the mold (4) (5 ) is injected and filled into the cavity (7). Here, the above-mentioned hot extrusion temperature is determined depending on the type of alloy, but generally a temperature range of about 350 to 480°C is used.

After the injection process is completed, the shear plate (3) is operated to release the excess runner section (C
) is separated and removed, and then, as shown in FIG. 4, the movable mold (5) is further opened to take out a predetermined molded product (A). In addition, the molds (3) and (4) are molded products with accurate shapes (A
) It is preferable to use a mold release agent (high temperature lubricant) in order to be able to easily perform molding and removal without any support.

Effects of the Invention According to this invention, an aluminum alloy material is index-molded into an injection mold using an extruder, which is the existing equipment of an aluminum extrusion mold manufacturing factory, as described above. An aluminum molded product having a desired product shape is obtained.

Therefore, any type of aluminum alloy that can be extruded can be molded, and even high-strength aluminum alloy materials can be molded into desired molded products without any problems. In addition, since it is basically an injection molding method that applies pressure to the alloy material and molds it, it is possible to obtain molded products with excellent dimensional accuracy, and even molded products with complex shapes can be molded to the desired shape in the same molding operation. It has the advantage of being able to manufacture high-quality molded products at low cost with simple operations compared to conventional casting or forging methods. be.

EXAMPLE A large extrusion press for aluminum material equipped with a hydraulic cylinder is used, and the shear plate (3) shown in the figure (4) is attached to it.
) and molds (4) and (5) were attached. A2014 alloy was used as the aluminum alloy material for molding, the extrusion temperature was 475°C, the container temperature was 400°C, and the mold preheating temperature was 4.
The injection molding operation was carried out at 75°C, ram speed of 1.5 m/min during injection, and pressure of 200 Kg/cm. After the material was injected, the mold was held in a depressed state for 20 seconds, and then the mold was opened to form a disc-shaped mold. When the hollow molded product was taken out, the molded product (A) was free from defects and had high dimensional accuracy corresponding to the shape of the cavity (7) of the molds (4) and (5).

[Brief explanation of drawings]

1 to 4 are sectional views of essential parts showing the embodiment of the present invention in the order of steps. (1)...Extruder, (2)...Container, (3)...Shear plate, (4)...
...Fixed mold, (5) ...Movable mold, (6
)...Gate, (7)...Cavity, (8)...Ram, (A>...Molded product, (B)...・・Alloy material. Above - Factor and subtraction method

Claims (1)

[Claims] (1) A fixed mold and a movable mold that form a cavity are attached to the tip of the container of an extruder used for extruding aluminum alloy through a movable shear plate that constitutes a gate, and the mold is loaded into the container. 1. A method for manufacturing an aluminum molded product, comprising injecting an aluminum alloy material into the cavity by hot extrusion to form a predetermined molded product.