Powder metallurgy selection criteria

1 part size

The size of the powder metallurgy parts is limited to the compression of the powder and the forming press tonnage. For general steel powder metallurgy materials, parts of the following specifications can be prepared:

The projected surface area is less than 32 000ram2;

Diameter less than 175mm or less than 300ram (parts for large holes);

The maximum length is 150ram, the minimum length is 1.5ram;

The maximum ratio of length to diameter is 5:1; the maximum value of the ratio of length to wall thickness is 8.

If the product is designed to use non ferrous materials, the projected area can be increased by 50%

2 part shape

The geometry of the parts must be suitable for single axial compression movement in vertical direction (see legend parts). The undercut and concave or threads are generally formed in the subsequent processing or machining. When the cross section of the part is changed, the mold in the forming press is required to have different actions. These limitations parts only have five table, however, through the mold design, in the direction of the length of parts (table) increased small changes are possible (see specific instructions complex shape of powder metallurgy parts design MPIF design manual). When the part length is greater than 25.4mm, the density will be different from the top (highest density) to the middle (low density).

3 part number

In view of special mould is the use of "hardware", should discuss the quantity cost and feasibility of the number of production orders.

4 Mechanical / physical performance requirements

Standard 35 offers a wide range of design performance in order to contribute to the selection of suitable materials for most product applications. (6.4-6.9g / cm3) medium density steel grades can be alternative to cast iron or plain carbon steel; high density grades (7.0 - all / focusing) general alternative ductile cast iron and heat treatment of steel, powder forging and non porous material system generally can be used as a substitute for high performance steel. If the key performance requirements of the part design exceed the standard values listed in the standard, these requirements shall be detailed in the engineering drawings.

In order to select the best materials for performance and cost and feasibility of the two, and the application of the powder metallurgy parts manufacturers to discuss parts is the most important.

In order to avoid the emergence of the concept of unclear or misunderstanding, the buyer and production should be before manufacturing powder metallurgy parts, the following conditions reached an agreement: minimum intensity values, brand choice, chemical composition, acceptance test, performance standard value and powder metallurgy manufacturing process, because these may affect parts.