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Powder metallurgy mould structure and strength check

Jun 13, 2018

According to the analysis of the powder metallurgy forming process, according to different manufacturing process requirements, we can choose different forms of powder metallurgy forming mold. Usually, after determining the basic dimensions of the die, punch and mandrel, and selecting the model specifications of the press, the structure of the powder metallurgy forming die can be designed according to the production plan.

 

At present, the structural forms of powder metallurgy mould mainly include three major categories: 1. Combined structure, mainly used for the compaction of metal powders in small batches; Punch block to adjust; 2, fixed type, suitable for general-purpose press on the small-volume metal powder parts press forming, the filling height of each segment of the die is adjusted by the punch on the floating die seat; 3, fixed, The type of structure used for large-volume metal powder press molding on special presses.

 

Next, determine the closed height of the powder metallurgy mold. For example, when using a fixed mold structure, the upper punch can be either fixed or floating. In addition, it is necessary to check the strength of the mold-related force components. Since the press forming die works under a high cycle load, it is necessary to check the strength of the main stress member.

 

For example, in the process of checking the strength of a spring component of a powder metallurgy mold, a cylindrical compression coil spring is usually used. Its selection and verification can be carried out according to the relevant manuals. For example, in a mold, the powder part is formed by pressing on an ordinary hydraulic press or mechanical press with an ejector device. The powder feeds the powder into the die cylinder and is placed on the ejector pin. The head should be at the highest position to ensure that the bottom surface of the powder is flat.

 

During the powder metallurgy mold pressing process, the slider moves downwards to move the punch down to the wedge-shaped fixing block to stop, and the punch presses the powder to force the punch to move downwards synchronously to the positioning block to realize powder distribution along the height. When the slider continues downwards, the wedge-shaped fixing block is pushed aside and the punch begins to press-form the powder in the mold cavity of the powder metallurgy forming mold. After the pressing, the punch ejects the workpiece. http://www.yxhgmould.com/