Manufacturing method for aluminum parts

Abstract

To provide a method for manufacturing aluminum parts that can improve product strength using a press machine that presses a portion of the product. [Solution] The method for manufacturing aluminum parts involves identifying areas in the cast aluminum parts where the allowable stress is insufficient (S11), and then forging these areas by pressing them perpendicular to the principal stress (S12).

Description

Technical Field

[0001] The present invention relates to a method for manufacturing aluminum parts.

Background Art

[0002] Patent Document 1 describes an aluminum casting-forged product that is forged as a whole after casting.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since the product is forged in one direction as a whole, there is a problem that it is difficult to improve the strength of the portion where the allowable stress is insufficient.

Means for Solving the Problems

[0005] In a method for manufacturing an aluminum part according to an embodiment, by forging each base material, powder-like flow deformation is caused while brittlely fracturing porous inclusions.

Effects of the Invention

[0006] According to the method for manufacturing an aluminum part of the present disclosure, the product strength can be improved by a press for pressing a part of the product.

Brief Description of the Drawings

[0007] [Figure 1] It is a flowchart showing an example of a method for manufacturing an aluminum part according to Embodiment 1. [Figure 2] It is a diagram showing an example of analysis of insufficient allowable stress in a method for manufacturing an aluminum part according to Embodiment 1. [Figure 3]This is a cross-sectional view showing an example of forging in the manufacturing method of aluminum parts according to Embodiment 1. [Figure 4] This graph shows the relationship between the projected area of ​​the inclusion and the allowable stress according to Embodiment 1. [Modes for carrying out the invention]

[0008] Embodiment 1 Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a flowchart showing an example of a method for manufacturing aluminum parts according to Embodiment 1.

[0009] In step S11 of Figure 1, areas of the cast aluminum part with insufficient allowable stress are identified. Specifically, an analysis simulating the input to the target product is performed. Then, areas of the cast product with insufficient allowable stress are identified. For example, areas with insufficient allowable stress are areas with inclusions of Φ2 or less. Figure 2 is a diagram showing an example of an analysis of insufficient allowable stress in the manufacturing method of aluminum parts according to Embodiment 1. In Figure 2, areas 21 to 26 are areas with insufficient allowable stress. Then, the excess allowable stress in the direction perpendicular to the principal stress of the areas with insufficient allowable stress is identified. Then, the process proceeds to step S12.

[0010] In step S12, the area where the allowable stress is insufficient is forged by pressing in the direction perpendicular to the principal stress. Figure 3 is a cross-sectional view showing an example of forging in the manufacturing method of an aluminum part according to Embodiment 1. The casting 32 placed on the press table 31 is forged by the press machine 33 at the locations where the inclusions 34 and 35 are present. Figure 4 is a graph showing the relationship between the projected area of ​​the inclusions and the allowable stress according to Embodiment 1. In Figure 4, the horizontal axis is the projected area of ​​the inclusions, and the vertical axis is the allowable stress. As shown in Figure 4, the allowable stress increases as the projected area of ​​the inclusions decreases.

[0011] Therefore, by forging the locations where inclusions 34 and 35 exist, the inclusions are crushed and their projected area is reduced, thereby increasing the allowable stress.

[0012] Next, we will explain the comparison of the methods. In Table 1, the evaluation is in the order of double circle, circle, triangle, and cross. As shown in Table 1, casting, forging, and cast-forging all receive an evaluation of △ or lower in any of the following categories: degree of freedom in shape, cost, tensile strength, or fatigue. In contrast to these methods, the method of forging parts of castings with inclusions according to this disclosure all receive an evaluation of Circular or higher. [Table 1]

[0013] Thus, according to the manufacturing method of aluminum parts of Embodiment 1, after casting, it is possible to identify areas in the aluminum parts where the allowable stress is insufficient, and to improve the allowable stress and thus the strength of the product by pressing and forging these areas perpendicular to the principal stress.

[0014] Furthermore, the manufacturing method for aluminum parts of Embodiment 1 allows for greater freedom in product shape due to the casting process. Additionally, the manufacturing method for aluminum parts of Embodiment 1 eliminates the need to hammer the entire product, allowing it to be handled with a small press or similar machine, thus leading to cost reduction.

[0015] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. [Explanation of symbols]

[0016] 31 Pressing table 32 Castings 33 Press machine 34 Inclusions

Claims

[Claim 1] Identify areas in cast aluminum parts where the allowable stress is insufficient. A method for manufacturing aluminum parts, in which areas with insufficient allowable stress are forged by pressing them perpendicular to the principal stress.

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