JPH06226420A - Method and device for manufacturing light alloy-made wheel - Google Patents

Abstract

PURPOSE:To avoid the development of defect in a blank by misrun in a die, at the time of manufacturing the blank for light alloy-made wheel by semi-fused working method. CONSTITUTION:An extruding means 10 composed of a pressurizing chamber 11 and a punch 12 and the die 20 for filling the semi-fused blank forcedly fed from the extruding means are provided, and in the inner part of the die, a cavity for light alloy-made wheel forming a hub part 25, rim part 26 and spoke parts 27 for connecting these are formed. A blank passage 30 connecting the cavity of wheel shape to the extruding means is opened in the center part of the cavity for hub part. The inner part of the cavity is filled with the semi- fused light alloy forcedly supplied from the extruding means 10 through this passage. After the tip part of flowing blank metal is branched, at the time of again joining, the change for mixing impurity in the joining part is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method and apparatus suitable for producing light alloy wheels such as automobiles and motorcycles, in which a light alloy as a raw material is heated in a semi-molten state in a pressure chamber. The present invention relates to a molding method in which a mold is put into a mold, and is strongly pressed with a punch to flow into a mold for molding, and an apparatus used therefor is improved.

[0002]

2. Description of the Related Art Generally, a method and apparatus for forming a material for a wheel by using such a light alloy material in a semi-molten state is already known (for example, Japanese Patent Publication No. 58-5748).
JP-A-55-19499, etc.).

[0003]

However, there are still many problems to be solved in the method of manufacturing a wheel using such a manufacturing method, and it has not reached the practical range. One of the causes is that the material yield is still insufficient. The causes of poor yield are roughly classified into two. That is, one of them is a defect at the time of molding, which is caused by inclusion of impurities or shrinkage cavities in the product. The surface of the material that flows in the cavity is covered with a relatively thick oxide film, so when the material splits or merges inside the cavity, one factor is that the oxide film is caught inside. ing. The second is that the sprue member that is discarded during molding is large. This is because the sprue extends outward from the cavity and has a large length such that a small diameter portion is formed at a portion connected to the cavity in order to facilitate the cutting.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned inconveniences. According to the invention of claim 1, a material is introduced into the wheel center forming the hub portion of the cavity forming the wheel to fill the material. The method is characterized in that, according to the invention of claim 2, the opening / closing direction of the mold and the axle direction of the wheel forming the cavity are aligned with each other, and the material passage is opened to the hub portion of the cavity. Further, according to claim 3, a shearing member facing the cavity and capable of moving forward and backward toward the material passage is provided, and after filling the cavity with the material, a part of the wheel filling the cavity is cut to cut the wheel and the material passage. It is characterized in that it includes a cutting step for separating the sprue member remaining in the passage. According to a fourth aspect of the present invention, a wheel passage forming a cavity is aligned with an axial direction of the mold and a mold opening / closing direction, and a material passage connecting the pushing means and the cavity, and a material passage from the other side of the cavity. The characteristic is that the advancing / retreating shearing member is aligned with the axial direction of the wheel forming the cavity.

[0005]

[Function] The semi-molten material extruded from the pressurizing chamber by the extruding means flows into the hub portion in the cavity through the material passage, then flows radially toward the rim portion, and finally through the spoke portion. Fill the rim part. Then, when the material is appropriately solidified, the shearing member removes the material from the other side from the other side of the cavity, that is, shears a part of the wheel and pushes it into the material passage. As a result, the wheel and the sprue member are separated. When the mold is opened, the material passage and the shearing member are provided in the axle portion of the wheel, so the cut portion of the sprue member reduces the machining cost when machining the axle hole of the wheel and facilitates the mechanical process. To do.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows steps of the manufacturing method of the present invention. In the figure, 10 is an extruding means, which is composed of a pressurizing chamber 11 formed in a cylindrical shape, and a hydraulically operated punch 12 that advances and retracts into and from the pressurizing chamber 11. Reference numeral 13 is a material, specifically, a cylindrical billet made of an aluminum alloy that is heated in a semi-molten state. Two
0 is a mold made of cast iron and has a cavity 21 formed therein. Reference numeral 30 is a material passage that connects the extrusion means 10 and the cavity 21.

As shown in detail in FIG. 2, the mold 20 is composed of a fixed mold 22 and a movable mold 23, which are divided into upper and lower parts, and a pair of two horizontal dies 24, 24 which are moved forward and backward between them. The cavity 21 is formed in the opposing surface. In this embodiment, the cavity 21 has an inverted shape of a wheel W for an automobile, and has a hub portion 25 and a rim portion 26 of the wheel W,
And a space corresponding to the spoke portion 27 connecting them is formed. The punch 12, the material passage 30, and the shearing member 40 described later are all arranged on the axis A of the axle of the wheel W. In other words, the cavity 21 is formed so that the opening / closing direction of the mold coincides with the axial direction of the axle, and the opening of the material passage 30 to the cavity 21 and the shearing member 40 are connected to the axis of the axle. It is arranged so as to face each other on A.

As described above, the shearing member 40 has the hub portion 2
It is disposed so as to face the material passage 30 through the fixed die 22 which constitutes 5 and can be advanced into the material passage 30 through the cavity 21 by an advancing / retreating mechanism (not shown). Reference numeral 28 denotes an extruding pin for separating the product wheel from the mold, and 29 denotes an actuating mechanism for advancing and retracting the extruding pin 28. As shown in FIG. 2, they are a step portion 41 provided on the shearing member 40 and an extruding portion. And the plate 42. Therefore, the operating mechanism 29 pushes up the push-out plate 42 by the step portion 41 while the shearing member 40 moves up and advances into the material passage 30, and fixes the many push-out pins 28 placed on the push-out plate 42. The light alloy wheel W is extruded from the mold 22 into the cavity 21 and removed from the fixed mold 22. As described above, the mold opening / closing direction and the shearing member 40
Since the direction of movement of the product is matched, the product can be extruded by the extrusion pin 28 and the sprue can be cut by one operation.

The operation of the apparatus will be described below with reference to the process diagram of FIG. 1 and the detailed diagram of FIG. 1 (a) and 3
(A) shows the beginning of the process. In this state, the mold 20 is closed, and the material 13 heated in the semi-molten state is inserted into the pressure chamber 11. (B) is punch 1
2 shows the state in which the material 13 in the pressurizing chamber 11 is pushed down into the material passage 30 and the material flows in the cavity 21 to fill the material.

In this process, the material 13 becomes a rod shape from the material passage 30 and flows into the cavity 21, but immediately hits the lower fixed die 22 and becomes a thin disc shape.
In this state, the material 13 is replenished one after another from the material passage 30, so that the material 13 in the cavity 21 has a disk-like shape, its diameter is enlarged, and the spokes 27 are radially and concentrically expanded. Then, it eventually reaches the rim portion 26 and is prevented from proceeding further. When the material reaches the rim portion 26, the inside of the cavity 21 is completely filled with the light alloy as the material, and the internal pressure rises. Immediately after the completion of this filling, the punch 12 further applies a higher pressure to the material 13 for 2 to 10 seconds to increase the material density of the wheel W to be the product and to make the pores formed in the product fine. , Or eliminate the shrinkage cavities.

In (c), the punch 1 is finished after the formation of the wheel W is completed.
2 shows the state where the ascending starts. Punch 1 in this process
Almost at the same time that 2 starts to rise, the shearing member 40 also starts to rise, and as shown in FIG.
A circular crack C is generated in the center of the hub portion 25 of the wheel W filling the inside of the cavity 21 in cooperation with the opening of the wheel, and then sheared. As a result, the wheel W and the sprue member 14 are separated. The shearing member 40 further penetrates through the hub portion 25 into the material passage 30 and pushes the sprue member 14 into the pressurizing chamber 11 for easy removal therefrom. Figure 3
(C) shows this state.

As the shearing member 40 further advances into the material passage 30, the movable die 23 starts to move upward and separates from the fixed die 22 to open the inside of the cavity 21. Immediately after that, the shearing member 40 pushes up the extruding plate 42 by the step portion 41, and extrudes a large number of the extruding pins 28 mounted on the extruding plate 42 into the cavity 21 from inside the fixed die 22, thereby making the wheel of light alloy. The W is lifted from the fixed mold 22.

The sprue member 14 is thus removed together with a part of the wheel W that has filled a part of the cavity separated from the wheel W, and the sprue member 14 itself is not cut.
Therefore, unlike the conventional case, the sprue member does not remain on a part of the wheel W, and the step of removing them from the wheel W by using a saw is not necessary. Further, since the sprue member 14 is connected to the wheel W on the axis line of the axle, the hole drilled by the shearing member 40 for removing the sprue member 14 serves as a pilot hole for machining the shaft hole of the wheel W. Since it can be used, the drilling process is omitted or simplified, and the subsequent machining process is simplified.

In (d), the die 20 is opened, and the punch 12 and the movable die 24 are moved upward together with the sprue member 14,
The shearing member 40 and the pushing pin 28 have returned to their original positions. The light alloy wheel W, which is a product material, is in a state in which it is separated from the stationary die 22 and simply rests on it, that is, in a state in which it can be taken out of the machine by a transfer robot (not shown). .

[0015]

INDUSTRIAL APPLICABILITY As described above, the manufacturing method according to the present invention minimizes the splitting and merging of the materials in the flow process of the material during molding, so that the oxide film and impurities adhering to the surfaces of the materials are Without being taken in,
Material defects such as shrinkage cavities, holes and cracks do not occur. Further, since the sprue member 14 is separated by the shearing member 40 together with the material forming the hub portion 25, the sprue member 14 does not remain on the wheel W side at all, and the work for removing the sprue member 14 can be omitted and the axle hole is processed. Available as a pilot hole for.

The device according to the present invention has a cavity 2
1 is divided in the axial direction of the wheel, and the material passage 30 and the shearing member 40 are arranged so as to face each other on the axis A. Therefore, means for carrying out the above-mentioned manufacturing method, for example, the shearing member 40 and the extruding pin 28, etc. It becomes possible to arrange the members of the above-mentioned in the inside of the rim portion, and a large area is not required to install them. Therefore, the present invention has the effect of significantly improving the practicality of semi-melt processing light alloy wheels by improving the material yield and downsizing the apparatus.

[Brief description of drawings]

FIG. 1 is a process drawing showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure of a mold used in the manufacturing method.

[Fig. 3] Detailed view of main parts of each process

[Explanation of symbols]

 10 ... Extruding means 11 ... Pressurizing chamber 12 ... Punch 13 ... Material 14 ... Gate member 21 ... Cavity 22 ... Fixed mold 23 ...・ ・ Movable type 24 ・ ・ ・ ・ Horizontal type 25 ・ ・ ・ ・ ・ ・ Hub part 26 ・ ・ ・ ・ Rim part 27 ・ ・ ・ ・ Spoke part 30 ・ ・ ・ ・ ・ ・ Material passage 40 ・ ・ ・ ・ ・ ・ Shearing member A ・ ・ ・ ・・ Axis W: Wheel

Claims (4)

[Claims] 1. A die having a cavity corresponding to a hub portion, a rim portion, and a spoke portion connecting the hub portion and a rim portion of a wheel therein, and an extrusion means for pressing a semi-molten material to flow it through a material passage. In the method for manufacturing a light alloy wheel that pressurizes the material supplied to the pressurizing chamber and guides it into the cavity, the downstream end of the material passage is opened to the hub portion forming the cavity, A method for manufacturing a light alloy wheel in which semi-molten raw material metal supplied under pressure is radially flowed from a hub portion to a rim portion to fill a cavity. 2. An extruding means for delivering a semi-molten material and a mold filled with the material extruded from the extruding means, and the mold is divided into at least two opposed molds, a fixed mold and a movable mold. In the manufacturing device of a wheel made of light alloy, the hub and the rim of the wheel and the cavities corresponding to the disk-shaped spokes connecting them are provided between them, and the wheel is formed in the mold. Form the cavity by matching the direction of the cavity axle and the direction of opening and closing the mold,
Moreover, a light alloy wheel manufacturing apparatus in which a downstream end of a material passage connecting the pushing means and the cavity is opened to a hub portion forming the cavity. 3. A die having a cavity corresponding to a hub portion and a rim portion of a wheel and spoke portions connecting them, and an extrusion means for pressing a semi-molten material to flow it through a material passage. In the method of manufacturing a light alloy wheel for pressurizing the material supplied to the pressurizing chamber and guiding the material into the cavity, the downstream end of the material passage is opened to the hub portion forming the cavity, and the material passage A shearing member capable of advancing and retracting toward the opening is provided, and after the material is filled in the cavity by the pushing means, it is advanced toward the opening, and a part of the wheel that is tied to the sprue member is cut to cut the wheel and the material passage passage. A method for manufacturing a light alloy wheel including a cutting step of separating the sprue member remaining in the wheel. 4. An extruding means for delivering a semi-molten material and a mold filled with the material extruded from the extruding means, and the mold is divided into at least two opposed molds, a fixed mold and a movable mold. In the manufacturing device of a wheel made of light alloy, the hub and the rim of the wheel and the cavities corresponding to the disk-shaped spokes connecting them are provided between them, and the wheel is formed in the mold. Form the cavity by matching the direction of the cavity axle and the direction of opening and closing the mold,
In addition, the downstream end of the material passage connecting the pushing means and the cavity is opened to the hub portion forming the cavity, and a shearing member that advances and retracts from the cavity side toward the opening of the material passage is provided. An apparatus for manufacturing a wheel made of a light alloy, which comprises a shearing means for shearing a sprue member by means of.