Workshop Technology
The upsetting is a process of

Reducing the cross-section of a bar
Joining the two surfaces of metal under pressure after heating
Bending of a bar
Increasing the cross-section of a bar

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Workshop Technology
The diaphragm moulding machine is used to

Give uniform sand hardness throughout the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform packing of sand in the mould

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