Sintered mechanical part and method of manufacturing the same
A technology of mechanical parts and manufacturing methods, applied in the field of sintered mechanical parts and its manufacturing, can solve the problems of cumbersomeness and high cost, and achieve the effects of suppressing breakage and reducing manufacturing costs
Active Publication Date: 2017-09-05
RESONAC CORPORATION
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Problems solved by technology
[0005] In the manufacturing process of the above-mentioned mechanical parts, it is necessary to separately prepare a pin made of ingot steel, and to add a process of pressing the pin into the main body made of sintered body, so it is cumbersome and costly
In other words, the advantages of powder metallurgy, which can be shaped in a near-net shape with fewer steps and are suitable for mass production, are lost
Method used
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Embodiment
[0114] Hereinafter, the present invention will be described in further detail through examples.
[0115] In terms of mass ratio, in the iron-based alloy powder composed of Ni: 2%, Mo: 1.5%, the remainder: Fe and unavoidable impurities, graphite powder is 0.3% of the total weight, zinc stearate The raw material powder was prepared by mixing the graphite powder and the zinc stearate powder so that the powder became 0.6% of the total weight.
[0116] The flaring base 12b of the pin (length: 6mm, radius r of the pin main part 12a: 2mm) is as image 3 In this way, the shape of an arc-shaped rotating body whose side surface shows an arc (radius R1=2mm) in the axial section is defined as the net shape of the sintered machine part, and the thickness of the surplus material 20 is changed within the range of 0-0.6mm (stress maximum position P) while preparing five types for modulation in this net shape as Figure 9 In this way, a forging die for compacting powder in the shape of the s...
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The present invention provides a sintered mechanical component made of sintered alloy, having a main body having an active surface, and a pin integrally formed with the main body and protruding from the active surface, and a manufacturing method thereof. The pin expands at the root in such a way that the side of the pin curves smoothly near the root in continuity with the active surface of the body. The sintered alloy has a metallographic structure having a matrix with a density ratio of 80 to 96% and a densified layer with a density ratio of 96% or more and a higher density ratio than the matrix. It is provided on the side surface of the pin so that the maximum stress position due to the load becomes 0.3mm or more. In the manufacturing method, the net shape of a sintered machine part having the above-mentioned shape is specified, and a sintered alloy sintered body having a density ratio of 80 to 96% is prepared, which is a region where the stress generated from the bending load applied to the pin increases. A shape in which the sides are more bulged than net shape due to excess material. The remainder of the sintered body is recompressed in the cold room to form a net shape, thereby forming a densified layer on the side of the pin.
Description
technical field [0001] The present invention relates to a sintered machine part having a pin protruding from one side of a main body and a manufacturing method thereof, and more particularly to a sintered machine part capable of suppressing breakage due to a load acting on the pin and a manufacturing method thereof. Background technique [0002] Powder metallurgy is a technology that solidifies raw material powder composed of metal powder and the like into a predetermined shape and size, and heats it at a temperature that does not melt it, so that the powder particles are firmly combined to manufacture metal products. The powder Metallurgical methods can form a near-net shape with fewer steps, and are suitable for mass production, etc., and are being applied to automotive machinery parts and various industrial machinery parts. [0003] In sintered parts based on powder metallurgy, usually, the voids between powder particles when the raw material powder is compression-molded ...
Claims
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IPC IPC(8): B22F5/00B22F3/24C22C38/00
CPCC22C38/00B22F5/10C22C33/0207C22C38/08C22C38/12
Inventor 萩本豪上田胜彦中久木伟树入江清彰
Owner RESONAC CORPORATION