A metal powder metallurgy forming process
A powder metallurgy and forming technology, applied in the field of powder metallurgy, can solve the problems of uneven density of gears, multiple dead ends, and high failure rate, so as to improve the uniformity of density, reduce the difficulty of falling, and avoid uneven strength. Effect
Active Publication Date: 2020-04-21
山东新烨冶金科技有限公司
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Problems solved by technology
[0004] In order to solve the above problems, the present invention provides a metal powder metallurgy molding process, which can solve the need to inject blank powder into the gear cavity during the existing pressing molding. However, the gear cavity is composed of the gear tooth cavity and the hub cavity. When filling the tooth cavity, because the space in the tooth cavity is small and there are many dead angles, it is difficult to fill it completely with the filled green powder, which leads to a small density of the tooth part of the pressed gear, resulting in various parts of the gear. The uneven density of the position will lead to uneven strength of the semi-finished gear after sintering, which will affect the product quality and cause problems such as high defective rate
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[0035] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0036] Such as Figure 1 to Figure 6 As shown, a metal powder metallurgy molding process, the specific molding method is as follows:
[0037] S1. Mixing: Mix the required powders in proportion to make them homogeneous and make green powder;
[0038] S2. Forming: put the base powder into the lower mold 2, and the upper mold 4 is driven down by the pressing cylinder 3, thereby forming a mold clamping with the lower mold 2, and the upper mold 4 and the lower mold 2 in the mold clamping state carry out the base powder Pressing to obtain a gear blank;
[0039] S3. Sintering: putting th...
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The invention provides a metal powder metallurgy forming process which is completed through the cooperation of a machine tool frame, a lower die, a pressing air cylinder and an upper die. According tothe invention, the problems that through an existing pressing molding process, the blank powder needs to be injected into a gear cavity, however, the gear cavity is composed of a gear tooth cavity and a hub cavity, when the gear tooth cavity is filled, due to the smaller space in the gear tooth cavity and the more dead angles, the filled blank powder is difficult to completely fill the gear toothcavity, so that the density of the gear tooth part of the pressed gear is smaller, the density of all positions of the gear is uneven, and further the strength of a sintered gear semi-finished product is uneven, the product quality is affected, and the defective rate is higher, are solved.
Description
technical field [0001] The invention relates to the field of powder metallurgy, in particular to a metal powder metallurgy forming process. Background technique [0002] Powder metallurgy is the process of producing metal powder or using metal powder (or a mixture of metal powder and non-metal powder) as raw material, forming and sintering to manufacture metal materials, composite materials and various types of products. Among the powder metallurgy parts used in the automobile and other industries, powder metallurgy gears account for the largest proportion. The production of powder metallurgy gears is suitable for mass production, and the material utilization rate is high, and the size uniformity of the gears is very good. Among them, spur gears It belongs to a kind of gear. Powder metallurgy is usually used in the manufacture of spur gears. In gear manufacturing, compression molding is a very critical step, but the existing compression molding may encounter the following pr...
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IPC IPC(8): B22F3/03B22F3/10B22F3/26B22F5/08
CPCB22F3/03B22F3/10B22F3/26B22F5/08
Inventor 闫晶晶胡才富
Owner 山东新烨冶金科技有限公司