In recent years, powder metallurgy has experienced rapid growth in China. KAIYANG Powder Metallurgy Co., Ltd. has seized the opportunities presented by the times, forging ahead with determination and continuous innovation amid a favorable external environment, and has risen to the forefront of the industry in just ten short years. The company has achieved numerous technological breakthroughs, such as successfully realizing the assembly of various powder metallurgy products.

The continuous advancement of powder metallurgy technology has led to its increasingly widespread application in multi-process, complex-structured, and irregularly shaped products—particularly in the automotive components sector. However, constrained by the forming principle of powder metallurgy (the pressing principle), product blanks often cannot be formed in a single operation. Instead, they must first be pressed into two or more separate blanks, which are then combined to create a composite blank. Only after undergoing subsequent processing steps can the desired final product be obtained. Relying on a strong technological foundation and extensive production experience, Kaiyang Powder Metallurgy Company has accumulated profound expertise in the principles, methods, and key technologies related to the assembly of powder metallurgy components.

1. Molded blank component:

As shown in Figure (1), the formed blanks are assembled using a clearance fit. The outer diameter of blank A is slightly smaller than the inner diameter of blank B. These two blanks are precisely assembled by hand through positioning grooves and then bonded together via sintering:

2. Sintered blank assembly:

The sintered blanks are assembled using an interference fit, as shown in Figure (II). After sintering, the outer diameter of blank A is slightly larger than that of blank B. Using positioning grooves, blank A is mechanically pressed into blank B, thereby forming a press-fit assembly.

The assembly of powder metallurgy components can be broadly categorized into two main types: assembly of green compacts and assembly of sintered compacts. Assembly methods include clearance fits, interference fits, and a hybrid approach featuring reinforcing pins (which lies somewhere between the two aforementioned types). In addition, there are also assemblies involving parts made of the same material, assemblies involving parts made of different materials, and copper diffusion bonding assemblies. The specific assembly method to be used should be determined based on the product’s manufacturing process, structural design, and technical requirements.

The significance of powder metallurgy assembly processes:

The assembly of powder metallurgy components overcomes the limitations of conventional powder metallurgy and reduces the need for subsequent machining processes. As a result, these components are finding increasingly wider applications in fields such as electrical, mechanical, and automotive industries.