JPH0313259A - Half melt molding method - Google Patents

Abstract

PURPOSE:To improve the working efficiency of a half melt molding and to allow automation and mass production by heating a stock up to the temp. near a half melting temp. region in a heating furnace, transporting the stock to a molding device, heating the stock to the half melting temp., and then molding the stock. CONSTITUTION:The stock 15 is heated up to the temp. near the half melting temp. region in the separately provided electric heating furnace 20. The stock 15 in this state is set to a high-frequency heating device 13 of the molding device 10, where the stock is heated up to the molding temp. (half melting temp.) and an upper punch 14 is lowered immediately thereafter. The stock 15 is pushed through a stock holding chamber 12a into a recess 11a and is molded in the half-melted state. A forming mold 11 and a stock holding mold 12 are kept at the half melting temp. by a heater 16 so that the molding in the half-melted state can be made. The working efficiency of the molding device 10 is greatly improved in this way.

Description

[Detailed description of the invention] <Public funds for industrial use> The present invention relates to a method of forming a material in a semi-molten state.

<Prior Art and Problems to be Solved by the Invention> Casting has been known as one of the conventional metal processing methods. Casting is a processing method in which molten metal is poured into a mold and shaped, and relatively! It is characterized by the fact that it can be manufactured easily and at low cost even in rough shapes. However, casting tends to cause product defects such as shrinkage cavities, and there are also problems in that products with excellent mechanical properties such as tensile strength and yield strength cannot be obtained.

On the other hand, forging is a processing method in which a metal material is placed between a pair of tools or dies, and the tools or dies are brought close together to compress the material. It is known that properties can be improved. However, since forging requires a large amount of pressure to compress the mold, etc., there is a problem that it is difficult to mold some materials.

Therefore, the semi-molten forming method, which is a method for forming metals in a coexistence of solid and liquid states, has recently been studied as a method to reduce the deformation resistance during forming and improve the mechanical properties of molded products. ing.

An object of the present invention is to provide such a semi-molten molding method.

Means for Solving the Problems> The semi-molten forming method according to the present invention that achieves the above-mentioned object involves heating a material in a heating furnace to near the semi-melting temperature range, and then transporting this material to a forming device. It is characterized by heating the raw material to a semi-molten temperature using a heating device included in the molding apparatus, and molding the raw material in a semi-molten state.

Effect> Since the material heated to near the semi-melting temperature range is in a solid state, it is easy to handle and transport. Furthermore, in the molding device, the material heated to near the semi-melting temperature range by the heating device can be heated to the semi-melting temperature range, so that the molding efficiency can be significantly improved.

Example of implementation Below, the present invention will be explained based on examples.

1st! EJ shows an outline of the molding method according to this example.

As shown in the figure, the molding apparatus [10 has a mold 11 in which a recess 11m for molding a product is formed, and a material holding mold 12 in which a material holding chamber 12a communicating with the recess 11a is formed, A high frequency heating device 13 is placed above the material holding mold 12.
is provided. An upper punch 14 that fits into the material holding chamber 12a is provided above the high frequency heating device 13 so as to be movable in the vertical direction, and the material 15 held in the material holding chamber 12a is It is pressed into the recess 11a and embossed. A heater 16 is provided around the mold 11 and the material holding mold 12 to maintain the material 15 in a semi-molten state.

The working process of the semi-molten molding method using such a molding equipment [10 iez] will be explained.

First, in a separately provided electric heating furnace 20, the material 15 is heated to near the semi-melting temperature range, for example, if aluminum is selected as the material, just below the semi-melting temperature range of 580 to 630°C.
For example, it is heated to about 500 to 560°C. Since the material 15 in this state remains solid, it is easy to handle.

This material 15 is heated by the true frequency heating device 11 of the molding device 1110.
3 and then heated to the molding temperature (semi-melting temperature), for example 600° C., and then the upper punch 14 is immediately lowered.

As a result, the material 15 passes through the material holding chamber 12m into the recess 1.
It is pushed into 1a and molded in a semi-molten state. At this time, since the entrance cross-sectional area of the recess 111& is smaller than the cross-sectional area of the material holding chamber 12a, the material can obtain an extrusion effect during molding, and a molded product with excellent mechanical properties can be obtained.

In this embodiment, the mold 11 and the material holding mold 12 are
6 to maintain the semi-melting temperature, e.g. 600°C,
It can be molded while still in a semi-molten state. In addition,
Although not shown, the mold is provided with a thermocouple as a temperature control sensor.

In this way, by heating the material to near the semi-melting temperature range in the heating furnace 20 provided separately, and then heating it to the semi-melting temperature range using the heating device provided in the mold 10, Work efficiency is greatly improved. That is,
If an electric heating furnace is incorporated into the molding V & machine, the heating time to reach the semi-molten temperature range will be longer, resulting in a significant drop in work efficiency; In this case, transportation to the molding equipment becomes difficult.

Further, by employing a high frequency heating device as a heating device provided in the molding device, it is possible to obtain the effect of further significantly shortening the heating time in the molding device. Furthermore, when the material heated in the heating furnace is transported to the molding equipment, its surface temperature will drop, but with high-frequency heating equipment, the material is heated from the surface, so from this point of view, is also efficient.

Furthermore, heating using a high-frequency heating device also has the effect that precise temperature setting is easy by appropriately setting the output, time, etc. Of course, it is possible to improve the working efficiency of the molding apparatus, for example, even if a heating device using radiant heat is used, it is not possible to use a high-frequency heating device.

In addition, by preheating the material to near the semi-melting temperature range in a separately provided heating furnace, handling of the material to the molding device is improved, so for example, conveying rollers 30 may be used as shown in FIG. Therefore, since the preheated material is transferred from the heating furnace 20 to the molding FF110', the material holding die 12 is used as a heating device, so if a high frequency heating device is installed, a little more heating time will be required, but of course. Alternatively, the material may be automatically fed into the high-frequency heating device 13 as described above using the conveyance solar 30.

In addition, in order to achieve automation and mass production, it is desirable to make it easy to take out the molded product after molding, but for this purpose, it is necessary to separate the heater of the mold 11 from the Tanabata of the material holding mold 12. Therefore, it is preferable to maintain only the mold 11 at a temperature slightly lower than the semi-melting temperature range, for example, at about 450°C. This allows molding in a semi-molten state, and since the molded product immediately becomes solid after molding, it can be easily removed from the mold.

In addition, in FIG. 3, aluminum alloy A6061.
The semi-melting temperature range of P, FL, and M is shown.

From the same figure, it can be seen that in the case of these aluminum alloys as well, preheating may be performed at about 500 to 560° C. in a heating furnace.

<Effects of the Invention> As explained above, according to the semi-molten molding method of the present invention, the work efficiency of semi-molten molding can be greatly improved, and automation and mass production are possible. .

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an overview of a semi-melting forming method according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing another embodiment, and Fig. 3 is a graph showing a semi-melting temperature range of an aluminum alloy. It is. In the drawing, 10 is a molding device, 11 is a mold, 11m is a recess, 12 is a material holding mold, 12a is a material holding chamber, 13 is a high frequency heating device, 14 is an upper punch, 15 is a material, 16 is a heater, 201 and so on. Heating furnace, 30 rollers for conveyance.

Claims (1)

[Claims] After heating the material in a heating furnace to near the semi-molten temperature range, this material is transported to a molding device, and the heating device equipped in this molding device heats the material to a semi-melting temperature, producing a semi-molten material. A semi-molten molding method characterized by molding.