Sketch and describe the following press operations: 1. Punching 2. Shearing and 3. Trimming

Sketch and describe the following press operations: 1. Punching 2. Shearing and 3. Trimming
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Answer :

(i) Punching : In punching operation, a hole is the desired result. The size of hole is determined by the size of punch and clearance is allowed on the die. The figure shows the spacing of hole on plate2 is actuated by the stop1 the stripper plate 4 is attached to die body 5 prevents sheet metal from being lifted along with the punch 3 after punching operation. 

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(ii) Shearing : Shearing is an operation in which blanks are separated from a sheet-metal strip by cutting the opposite sides of the part in sequence. 

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(iii) Trimming : Trimming is the process of removing the flash around the edges of the finished forging in a separate press by trimmer dies. Trimming basically presses a part through a cutting die that runs the periphery of the work. The cutting dies are precisely designed to remove the flash from a particular part. Most often it is desirable to perform this operation while the work is still hot for maximum efficiency; therefore it is usually incorporated into the larger production process.

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