JPH0810890A - Press formation of semimelted aluminum billet - Google Patents

Abstract

PURPOSE:To provide a method for suitably and efficiently press forming a semimelted aluminum billet. CONSTITUTION:The semimelted aluminum billet is press formed in the conditions within a range surrounded with lines connecting four points of 3.0 and 15.0 (X10<2>mm/sec) punching speed at the time of 1.0kg/mm<2> punching pressure and points of 1.0 and 6.0 (X10<2>mm/sec) punching speed at the time of 20.0kg/mm<2> punching pressure to each other.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a semi-melting temperature of a billet containing aluminum as a main component (above the solidus line and below the liquidus line).
The present invention relates to a pressure molding method for a semi-molten aluminum billet in which the material is heated into a mold and charged into a mold, and is pressed by a pressure punch to perform molding.

[0002]

2. Description of the Related Art Conventionally, there is almost no technical disclosure regarding the pressure molding of the semi-molten aluminum billet as described above, and only the basic idea is introduced.
The forming technique for semi-melting temperature aluminum was unknown. An object of the present invention is to provide a method for appropriately and efficiently press-molding a semi-molten aluminum billet.

[0003]

In order to achieve the above object, the method of pressure-forming a semi-molten aluminum billet according to the present invention is performed by heating a billet containing aluminum as a main component to a semi-melt temperature and pressure-forming with a punch. a method for the punch pressure was in line range of 1.0 kg / mm ² and 20.0 kg / mm ^2, Ponchisupi when the punch pressure 1.0 kg / mm ² - the de 3.0 to 15.0 Ponchisupi when the punch pressure 20.0 kg / mm ² with a range of × 10 ² mm / sec - de was in the range of 1.0~6.0 × 10 ² mm / sec, the punch pressure 1.0 kg / Punch speed 3.0 x 1 when mm ²
When de 1.0 × 10 ² mm / sec connecting points and straight lines and the punch pressure ^{1.0kg / mm 2 - 0 2 mm} / Ponchisupi when the point and of the punch pressure 20.0 kg / mm ² in sec Punch speed of 15.0 × 10 ² mm / sec and punch pressure 2
Punch speed at 0.0 kg / mm ² 6.0 × 10 ² mm /
A straight line connecting the sec point and the punch pressure of 1.0 kg
/ Mm ² and a line of 20.0 kg / mm ² are used for pressurizing under the conditions within the range.

Next, the outline of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, reference numeral 1 denotes a lower mounting plate which can be moved up and down, and a lower mold 2 is fixed to the upper part thereof. The upper mold 3 is fitted to the upper part of the lower mold 2 via a fixed mounting plate (not shown). The mold 4 is configured as a whole. Further, above the upper mold 3, a punch 6 having a shape that can be fitted into the recess 5 of the mold 4 is formed.
Is provided so that it can be raised and lowered. Further, an aluminum billet 7 that has been heated to a semi-molten state is charged into the concave portion 5 of the mold 4, and when the aluminum billet 7 is charged, the lower mold 2 is lowered and the space between the upper mold 3 and the lower mold 2 is lowered. When it is widely separated, it is put into the concave portion of the lower mold 2, and then the lower mold 2 is raised and the upper and lower molds 2.3 are matched with each other to obtain the state of FIG. In this state, the punch 6 is lowered by a predetermined speed with a pressing force to press-form the billet 7 in the recess 5, the punch 6 is extracted, and the lower die 2 is lowered to push out a product extruding pin (not shown). The work of taking out the molded product is repeated.

FIG. 2 is a graph showing the proper working area indicated by the pressing force in the downward speed of the punch.
In the region, the punch pressure is excessively large, and a large load is applied to the punch and the die 4, which significantly shortens the life of the die 4. In the area B, the speed of the punch speed is increased, so that the mechanical device becomes large and the economy is impaired. In the C area,
The punch speed is slow and proper molding cannot be performed. Further, it was found that in the region D, the punch pressure was too low to perform proper molding.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the product shown in FIGS. 3 and 4 is molded by variously changing the punch pressure and the punch speed by the apparatus shown in FIG. As a product, an outer diameter of 120 mm and a thickness of 5 mm in a disk portion D, an outer diameter of 100
mm, the inner diameter is 90 mm, and the height is 20 mm. A cylindrical rib R is provided so as to face downward, and the cylindrical rib R has a diameter of 5 mm and a height of 2.5, 5.0, 10.0, 20.0 mm. 4 types of bosses a, b, c and d, which are different from each other, are provided at intervals of 40 mm, and 40 × 4 mm at an intermediate position for each boss a, b, c and d in the cylindrical rib R. The shape is such that four types of ribs e, f, g, and h whose heights are changed to 2.0, 4.0, 8.0, and 16.0 mm are provided. The billet 7 used has an outer diameter of 41 mm and a length of 10
It is 0 mm and consists of aluminum-silicon alloy component 57
Heated to 5 ° C. Table 1 shows the results obtained by engraving a shape corresponding to the shape of the product on the lower mold 2 in such a situation and performing pressure molding using the cylindrical punch 6.

[0007]

[Table 1]

In Table 1, No. 1 to No. 4 show the results of molding under punching conditions in the vicinity of point A in FIG. 2. If the punching speed is 1.0 × 1.0 ² mm / sec or more, all shape parts are Molded but punch pressure is 20.0kg
/ Mm ² or more to the excessive force to the mold is exerted elastically deformed extrusion pin (not shown) with the defeat the lower die 2 and bent. No. 5 to No. 8 show the results of molding under punch conditions near point A in FIG.
When the area becomes lower and the area becomes C area or D area, a satisfactory shape is not obtained. Furthermore, No. 9 and No. 10 show the results of molding under punch conditions near the point c in FIG. 2, and the molding pressure was 1.0 kg / mm even if the punch speed was sufficient.
Below ² , no satisfactory product has been obtained. No. 11 and No. 12 show the results of molding under punch conditions near point D in Fig. 2 and the punch pressure is 20.0 kg / mm.
^If it exceeds ² , the mold 4 is deformed, and the resulting product is also deformed in shape, and in some cases, it is difficult to take it out from the lower mold 2.

The region B in FIG. 2 was determined by comparison with a conventional aluminum material processing machine. That is, it is difficult to put into practical use unless it is a method considering economy, and there are die casting method, squeeze method and the like as molding methods that compete with the pressure molding method of the present invention.
Attempting to manufacture a molding machine having an ability corresponding to the B region by using the current technology requires several times as much cost as compared with the conventional die casting method or squeeze method. Therefore, the product cost of the pressure molding method according to the present invention exceeds that of the conventional molding method, and the economic merit is lost. The proper processing area may be determined in FIG. 2 according to each target product, and a pressure molding machine that meets this condition may be selected.
The punch pressure and punch speed can be arbitrarily combined in consideration of various conditions such as the size of the product, the number of products produced, and the production tact. This makes it possible to design a pressure molding machine with excellent productivity and economy.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a pressure molding apparatus for carrying out the present invention.

FIG. 2 is a graph showing an appropriate machining area represented by punch speed and punch pressure.

FIG. 3 is a bottom view of a product molded in the example.

FIG. 4 is a front view of a product molded in the example.

[Explanation of symbols]

 2 Lower mold 3 Upper mold 4 Mold 5 Recess 6 Punch 7 Billet D Disc part R Cylindrical rib ae Boss fh rib

Claims (1)

[Claims] 1. A method of heating a billet containing aluminum as a main component to a semi-melting temperature and press-molding with a punch, wherein the punch pressure is 1.0 kg / mm ² and 20.0 kg / mm ^{2 in} a line range. The punch speed at a punch pressure of 1.0 kg / mm ² is within the range of 3.0 to 15.0 × 10 ² mm / sec, and the punch speed is at a punch pressure of 20.0 kg / mm ^2. In the range of 1.0 to 6.0 × 10 ² mm / sec and the punch speed at the punch pressure of 1.0 kg / mm ² .
A straight line connecting the point of 0 × 10 ² mm / sec and the point of punch pressure of 20.0 kg of the punch pressure of 10 × 10 ² mm / sec, and the punch velocity of the punch pressure of 1.0 kg / mm ^2.
Point 15.0 × 10 ² mm / sec and the punch pressure 2
Punch speed at 0.0 kg / mm ² 6.0 × 10 ² mm /
A straight line connecting the sec point and the punch pressure of 1.0k
Pressurizing method for semi-molten aluminum billet characterized by pressurizing under conditions within a range surrounded by g / mm ² and 20.0 kg / mm ² line