JPS6219937B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing aluminum wheels for vehicles.

When casting a cast product, it is essential to separate the runner part attached to the product part from the product part after molding. For example, (1) the cutting method, (2) the fusing method, and (3) the shearing method are used, but in this case (1) generally requires a large amount of processing time, and it is difficult to ensure the settings of the workpiece during processing. (2) requires a long processing time and a poor working environment, and (3) requires a great deal of force and is difficult to support, etc. If it is not done properly, there is a risk that the product will be severely distorted and lose its value.

The present invention targets cast products, particularly aluminum wheels for vehicles, and provides a method for manufacturing aluminum wheels, which is characterized by employing a step-by-step molding method that does not adversely affect the product. With the goal.

The method of the present invention will be explained below with reference to the drawings.

Figure 1 is a cutaway view of a wheel cast with a runner in the center of an aluminum wheel. Conventionally, as shown in the figure, the part constituting the product 3 was received with a die 4, and a punch 1 was inserted into the runner. Processing was carried out by abutting and applying pressure, but when the cutting load was large, there was a risk that distortion S would occur in the product part, as shown in FIG. In the figure, the broken line indicates punching metal 2 that is cast to facilitate cutting.

Therefore, in the present invention, as shown in Fig. 3 (before machining) and Fig. 4 (after machining), a structure made of steel, cast iron, etc., is cast adjacent to the runner to prevent the intrusion of defective molten metal. A ring 5 and a flat plate 2 made of soft or hard steel or wire mesh having a predetermined hole area in a predetermined range adjacent to the ring 5 (this technique is known) are used to punch the excess wall of the ring 5 with a punch 1 and a die 4. When pressure is applied between the holes, the runner part cracks and cracks occur in the B part and propagate to the surface of the punched metal 2. ring 5
As is clear from the specification and drawings, the punching metal 2 is placed on the punching metal 2, and this prevents the punching metal 2 from lifting and moving during casting. In addition to having this action and effect, it also plays a role and effect when cutting the runner. In other words, the runner part and the product part 3 are connected through approximately the same number of holes in the punching metal 2, but the ring (made of iron) 5 is connected by closing some of the holes in the punching metal (made of iron). It is supposed to reduce the cross-sectional area of the part. Due to this reduction in the cross-sectional area of the connecting portion, the pulch load required during cutting becomes lower than when no ring is used, and therefore no distortion occurs in the product portion 3.

Note that the ring (made of iron) 5 and the aluminum casting generate intermetallic compounds, so their interfacial surfaces are not joined, and the ring and punching metal are also joined because the temperature of the molten aluminum is lower than the melting point of iron. It will not be done. Then, sliding occurs between the flat plate surface and the product part, and the product part and the runner part can be separated by the shearing force. It refers to the relative positional change in the radial direction between the flat plate surface, that is, the upper surface of the punching metal 2 and the facing face of the punching metal 2 of the product part 3. More specifically, as the pressing stroke of the punch 1 increases, the flat plate surface (upper surface of the punching metal) deforms into a concave shape, as shown in Figure 4, and its circumferential part is squeezed and contracts in the radial direction. means. At this time, no pressure is applied to the product, so no distortion occurs. Here, the two-dot chain line is the final product designation line, and as shown in FIG. 4, the ring can be easily cut from the punched metal portion 2 leaving a margin from the product designation line.

However, when the thickness of the runner section is large in the axial direction, it becomes difficult to bend, resulting in incomplete cutting as shown in FIG. 6 is a plan view of the cut portion of FIG. 5. FIG. By the method shown in Fig. 3, a fractured surface is generated between the punching metal 2 and the product part 3 as shown in Fig. 4 (partial stroke), and then the die 4
If the parts are replaced and pressurized using the method shown in Fig. 1, the product part and the runner part can be separated as shown by the curve b→c in Fig. 11. On the other hand, if the pressure is continued in the manner shown in FIG. 3, the load will increase as shown by curve a in FIG. 11, which is not a good idea.

By using the above-described method, the present invention makes it possible to obtain a finished product at a low price in a short manufacturing time while preventing adverse effects such as undue distortion on the product part that reduce the product/value. In addition, by using punching metal in the present invention, it is possible to prevent the passage of slag generated in the molten metal, and therefore, by allowing only good quality (clean) molten metal to pass through, a high quality casting method (in the case of the present invention) is possible. It is also possible to obtain the effect that aluminum wheels can be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional method for cutting the excess thickness of a casting runner, Figure 1 shows before processing, Figure 2 shows after processing, and Figures 3 and 4 show a cutting method that is the gist of the present invention. ,
Fig. 4 is a diagram after cutting in Fig. 3, Figs. 5 and 6 show examples of defective cutting, Figs. 7 to 9 show examples of various cuts provided to improve machining, and Fig. 10 FIG. 2 is a processing procedure diagram for cutting the extra wall portion of an aluminum wheel according to the present invention. 1... Punch, 2... Punching metal, 3...
...Product Department, 4...Dice, 5...Ring.

Claims (1)

[Claims] 1. In a method for manufacturing a vehicle wheel body, a ring for preventing the intrusion of defective molten metal is installed in a part of the mold adjacent to the central runner, and a ring with a predetermined pore area is attached to the outside of the ring. After installing a flat plate having a thickness, an aluminum wheel with extra thickness is manufactured by pressure casting, and after being molded, the flat plate installation part in the center of the product is pressurized from above, the excess thickness is cut from the flat plate part, and A method for manufacturing an aluminum wheel for a vehicle, the method comprising the step of cutting the remaining excess thickness.