Pressing in rigid molds (1986)

Alternating frames with different types of metalworking.

Large amounts of metal shavings during operations.

Device for pressing parts from metal powder.

Automated pressing and sintering processes.

Cartoon explaining the composition of the mold.

Disassembled mold.

Cartoon explaining the process of forming products.

Graph and curve of the process.

Cartoon explaining the process of compacting powders from different metals.

Picture of changes in the internal structure of hard metals during compression.

Picture of changes in the internal structure of plastic metals during compression.

If you press powder layers of the same weight and height, you can see that the individual layers after compression differ in height and shape.

Each upper layer is thinner.

This is due to friction between the particles, which slows down their movement in the direction of application of force, as well as due to friction between the powder particles and the surface of the mold.

It is external friction that leads to an uneven distribution of density in the briquette.

To reduce friction between particles, as well as external friction, lubricating components are introduced into the powder, which are mixed with the powder in mixers.

Cartoon explaining the effect of lubricating components.

In practice, if necessary, lubrication of the working surface of the punches and the walls of the mold is used.

Lubrication promotes uniform distribution of density by the height and diameter of the briquette.

In addition, lubrication reduces the pressing and ejection pressure.

The amount of force that must be applied to extract the briquette from the mold also depends on external friction.

Ejection pressure.

The concept of elastic aftereffect.

Finished products made of metal powder.

Containers with blanks.

When manufacturing parts of precise dimensions, the shelf life of pressings before sintering should not exceed several hours.

Samples of finished products.