JPH07256422A - Apparatus for producing metallic formed product - Google Patents

Abstract

PURPOSE:To obtain a metallic product formed with a good quality metallic billet by arranging a shearing device and removing the surface layer part having large possibility of containing impurity, etc. CONSTITUTION:The almost cylindrical shaped billet B in the halfsolidified condition is supplied into a charging part 9a. Therefore, a hydraulic cylinder 12 is extension-driven to shift a plunger 14 downward. The billet 13 is interposed in a gap between a first shearing edge 6a formed in the opening part 6 of a pressing mold 7 and a second shearing edge 14a formed at the peripheral edge of tip part of the plunger 14 to receive the shearing action. In this case, as the billet B is in the half-solidified condition, the center part of the diameter D side can be punched out with the diameter (d) size by the comparatively small shearing force to the thickness size of the billet B. The material at the center part of the billet B is charged into the pressing chamber 6 positioned below the charging part 9a, and the material M in the pressing chamber 6 is pressurized with the plunger 14 and filled into a cavity through a material supplying hole 8. By this method, it is prevented to fill the surface layer part of the billet having large possiblity of containing the impurity into the cavity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a metal molded product using a billet made of a metal material in a semi-solidified state.

[0002]

2. Description of the Related Art Conventionally, a billet made of a semi-solidified metal material is loaded into a press-fitting chamber, and the billet is mechanically pressurized by a plunger or the like to deform and flow to fill the cavity with the metal material. There are those that manufacture metal molded products.

By the way, in a semi-solidified billet, impurities such as oxides and dendritic structures tend to be present in the surface layer portion of the billet. The quality will be reduced.

Therefore, in the conventional manufacturing technique of this type of metal molded product, in the process of pressurizing the billet loaded in the press-fitting chamber with the plunger to fill the cavity,
The metal material of the billet loaded into the press-fitting chamber is not filled into the cavity, but the filling of the metal material into the cavity is completed with a part of the metal material of the loaded billet remaining in the press-fitting chamber. I am going to let you do it.

This is because, as described above, the surface layer of the billet, which is highly likely to contain impurities, causes friction such as friction with the inner wall surface of the press-fitting chamber when it flows toward the cavity under pressure from the plunger. Therefore, since the flow toward the cavity tends to be delayed, the surface layer of the billet is allowed to remain in the press-fitting chamber as much as possible to fill the cavity with a metal material of good quality.

[0006]

However, in such a conventional method, the flow of the metallic material from the billet in the press-fitting chamber to the cavity is caused by the pressure distribution in the billet to which the pressure is applied by the plunger and the inner surface of the press-fitting chamber. It is unstable because it is affected by the frictional conditions caused by the contact between the and billet.

Therefore, such a conventional method cannot reliably prevent the surface layer portion of the billet from entering the cavity of the forming die, and is sufficient for obtaining a metal formed product made of a good quality metal material. is not.

The present invention has been made under such circumstances, and a billet made of a semi-solidified metal material is mechanically pressed to fill the cavity with the metal material from the press-fitting chamber to form a metal molded product. In the case of manufacturing a metal product, it is possible to reliably prevent the surface layer part of the billet from being filled in the cavity, which is likely to contain impurities, etc., and to obtain a metal product formed of a good quality metal material. It is an object of the present invention to provide a manufacturing apparatus of.

[0009]

In order to achieve this object, the invention according to claim 1 has a cavity and a press-fitting chamber which communicates with the cavity at one end and has an opening at the other end. By installing a plunger that can move in and out from the opening side in this press-fitting chamber, a billet made of a semi-solidified metal material in which a solid phase and a liquid phase are mixed is pressed by the plunger to press the metal material of the billet into the press-fitting chamber. In a device for manufacturing a metal molded product for filling a cavity from a cavity, a billet mounting portion that covers the entire opening of the press-fitting chamber is provided on the front surface, and a first shearing blade is formed on the edge of the opening over the entire circumference thereof. However, a second shearing blade that fits with the first shearing blade and punches out the billet is formed over the entire circumference of the tip of the plunger.

[0010]

According to the first aspect of the present invention, when the semi-solidified metal material is loaded into the press-fitting chamber, the first shearing blade formed at the opening of the press-fitting chamber and the second shearing blade formed at the tip of the plunger.
With the shear blade of, the center of the billet is punched out, and only the center of the billet is loaded into the press-fitting chamber, leaving the peripheral part including the surface layer of the punched billet outside the press-fitting chamber, and this is filled into the cavity. To be done.

Therefore, it is possible to reliably prevent the surface layer portion of the billet, which is likely to contain impurities, from being filled in the cavity, and it is possible to obtain a metal molded product formed of a good quality metal material.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. First, the structure of a manufacturing apparatus will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes an apparatus for manufacturing a metal molded product.

The manufacturing apparatus 1 is a mold device 2 for molding a material M supplied in a billet form, and a filling device 3 installed above the mold device 2 for filling the material M into the mold device 2 while pressurizing it. Have and.

The mold device 2 includes a molding die 5 having a cavity 4 for forming the material M into a desired product shape, and a press-fitting chamber 6 for press-fitting the material M into the cavity 4 of the molding die 5.
The press-fitting die 7 and the billet mounting die 9 are provided.

The cavity 4 of the molding die 5 is formed in an open upper shape, and is located immediately below the lower surface of the press-fitting die 7 to define a molding space having a required shape.

The press-fitting chamber 6 of the press-fitting die 7 has a cylindrical shape oriented in the up-down direction and is formed in an upwardly open shape, and the edge portion of the opening 6a has the first shearing over the entire circumference. The blade 6b is formed and has a function as a die for punching.

A material supply port 8 formed as a small-diameter through hole is installed at the bottom of the press-fitting chamber 6 so as to be located at the center of the press-fitting chamber 6 in plan view.
A cutting blade 11 which is driven to move in and out in the horizontal direction by a driving device (not shown) is installed in a portion adjacent to.

Immediately below the lower surface of the press-fitting die 7, the molding die 5 is provided.
In the state where is positioned, the press-fitting chamber 6 has the material supply port 8
It is in a state of communicating with the cavity 4 via.

The billet mounting die 9 has a billet mounting portion 9a formed as a through hole in the center thereof, is mounted on the upper surface of the press-fitting die 7, and has an opening 6a of the press-fitting die 7 in plan view. The first shearing blade 6b is arranged in a state of concentrically protruding inside the billet mounting portion 9a.

In implementing the present invention, the installation of the billet mounting die 9 is omitted, and the opening 6a is formed in the upper surface of the press-fitting die 7.
And the billet B is directly positioned and arranged so as to cover the first shearing blade 6b.
The relevant part itself on the upper surface may be used as the billet mounting portion 9a.

Above the billet mounting die 9 of the die apparatus 2 constructed as described above, a hydraulic cylinder 12 installed in the vertical direction is arranged as a filling apparatus 3, and a piston rod of the hydraulic cylinder 12 is arranged. A plunger 14 is attached to the tip of the plunger 13, and the plunger 14 extends and contracts with the hydraulic cylinder 12 so as to extend in the vertical direction.
It is possible to move in and out on the O and insert / exit the press-fitting chamber 6 through the billet mounting portion 9a.

Then, the billet B, which will be described later, which is fitted in the first shearing blade 6b and is arranged in the billet mounting portion 9a is punched out over the entire circumference of the peripheral edge of the tip of the plunger 14. Two shearing blades 14a are formed to give the punching punching function.

Manufacturing of a metal molded product (hereinafter referred to as a product G) using the manufacturing apparatus 1 configured as described above is performed as follows.

First, the manipulator 28 supplies the billet B having a substantially cylindrical shape to the billet mounting portion 9a (FIG. 2).
(See (a)). In this embodiment, the material of the billet B is aluminum alloy AC4C (Al-7mass% Si-0.4mass% Mg alloy).
That is, the crystal grain size of the α phase is made finer in advance. In the billet B, an α phase that has been heated to a suitable temperature and solidified and an unsolidified liquid eutectic portion coexist, that is, a so-called so-called eutectic portion, which is heated to an appropriate temperature according to conditions such as the shape of the cavity 4 and the size of the material supply port 8. It is in a semi-solid state.

The billet B has the opening 6a.
And a size that covers above the first shear blade 6b,
In this embodiment, the plane dimension is the billet mounting portion 9a.
It is formed in a slightly small size so that it can be supplied to

This prevents the billet B from being excessively deformed when the billet B is punched out by the first and second shearing blades 6a and 9a, and the billet B is pressed into the press-fitting chamber 6 from the billet B.
This is to maintain a high yield of materials supplied to.

After that, the hydraulic cylinder 12 is driven to extend and the plunger 14 is moved downward (see FIG. 1).

As a result, the billet B is sandwiched between the first shearing blade 6a formed in the opening 6 of the press-fitting die 7 and the second shearing blade 14a formed at the peripheral edge of the tip of the plunger 14. Is subjected to shearing action.

In this case, since the billet B is in a semi-solidified state as described above, the central portion of the billet B, which has a diameter D by a small shearing force (pressing force) for the thickness of the billet B, is set. The material M, which can be punched out with a diameter of approximately d, is punched from the center of the billet B and is loaded into the press-fitting chamber 6 located below it (see FIG. 2B).

As described above, the billet B has a cylindrical outer peripheral portion having a thickness of (Dd) / 2.
Since the material M is left in a and only the central portion thereof is supplied to the press-fitting chamber 6, the material M loaded in the press-fitting chamber 6 is limited to a high-quality material containing few impurities.

Even after the material M is punched out from the billet B, the expansion operation of the plunger 14 is continued, the material M is pressurized by the plunger 14 in the press-fitting chamber 6, and a part of the material M is supplied. The cavity 4 is filled through the mouth 8 (see FIG. 2C).

In this embodiment, the lowering operation of the plunger 14 is stopped with a part of the material M remaining in the press-fitting chamber 6. This is because it is difficult to precisely match the amount of the material loaded in the press-fitting chamber 6 with the required amount in the mass production process of the metal molded product, and the billet B located along the lower surface of the plunger 14 This is for avoiding that the surface layer portion on the upper surface side of is filled in the cavity 4.

After the material M has been filled in the cavity 4 in this manner, the hydraulic cylinder 12 is driven to contract and the plunger 14 is retracted, after which the cutting blade 11 is moved.
And the billet mounting die 9 is moved upward and removed (see FIG. 2D).

As a result, the material M is loaded into the cavity 4
The product G is separated into the product G and the remaining portion Z on the press-fitting chamber 6 side, and the remaining portion Z that may remain in the press-fitting chamber 6 and possibly contain impurities such as oxides is excluded (see FIG. 2 (e)). ).

After that, the press-fitting die 7 is moved upward from the molding die 5 to be separated therefrom, and the product G remaining on the molding die 5 is taken out by operating a knock pin (not shown) (see FIG. 2 (f)). Therefore, it is possible to surely obtain a metal molded product formed in a required shape and made of a good quality material.

[0037]

As described above, according to the first aspect of the invention, when the semi-solidified metal material is loaded into the press-fitting chamber, the first shear blade and the plunger formed in the opening of the press-fitting chamber. With the second shearing blade formed at the tip of the, the center part of the billet is punched out, leaving only the center part of the billet in the press-fitting chamber while leaving the peripheral part including the surface layer part of the punched billet outside the press-fitting chamber. , Which fills the cavity.

Therefore, it is possible to reliably prevent the cavity from being filled with the surface layer portion of the billet that is likely to contain impurities, and it is possible to obtain a metal molded product formed of a good quality metal material.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a manufacturing apparatus.

2A to 2F are manufacturing process diagrams of a metal molded product.

[Explanation of symbols]

 B billet G product M material 1 manufacturing device 4 cavity 6 press-fitting chamber 6a opening 6b first shearing blade 9a billet mounting part 14 plunger 14a second shearing blade

Claims (1)

[Claims] 1. A cavity having a cavity and a press-fitting chamber communicating with the cavity on one end side and having an opening formed on the other end side, and a plunger capable of coming in and out from the opening side is installed in the press-fitting chamber to form a solid phase. In a device for manufacturing a metal molded product in which a billet made of a semi-solidified metal material mixed with a liquid phase is pressed by the plunger to fill the metal material of the billet into the cavity from the press-fitting chamber, a front surface of the opening of the press-fitting chamber. Is provided with a billet mounting portion that covers the entire opening, and a first shear blade is formed on the edge of the opening over the entire circumference thereof, and the first shear blade is fitted over the entire circumference of the tip of the plunger. And a second shearing blade for punching out the billet.