INTRODUCTION TO PRESS TOOLS

PRESS TOOLS & OPERATIONS

Blanking:

Blanking is a process of producing flat stampings. The entire periphery is cut and cut out piece is called the blank.

Piercing:

It is the operation of making hole in the stamping. Here also the entire periphery is cut and cut piece is waste.

Cut-off:

Cut off operation separates the work material along a straight line or angular or irregular in a single cut. No scrap is produced in cutting off operation.

Parting off:

Parting off is an operation which involves cutoff operation to produce blank from the strip as shown in the figure. During parting, some scrape is produced. There fore, parting is the nextbest method for cutting blanks.

Perforating:

If more number of holes are pierced, it is called perforating.

Side cam tool:  
 Side cam transforms vertical motion from the press ram into horizontal or angular motion in the tool.

Dinking:

To cut paper, leather, cloth, rubber and other soft materials a dinking tool isused. The cutting edges penetrate the material and cuts. The die will be usually a plane material like wood or hard rubber.

Trimming:

It is the operation of cutting the edges of the drawn components which are wavy and irregular. The term trimming is also used when the material of a strip or the portion of a blankedcomponent or a portion of a pierced hole is partially removed.

Shaving:

It is an operation of removing a small amount of material a around the edges of a previously blanked stampings or pierced hole to get a good finish on the cut edges and accuratedimensions with min. radius at the edge of the component.

Broaching:
It is similar to shaving operation. In this a tool having aseries of teeth profile removes metal from the edges of theblanked component in a progressive way.

Lancing:

It is a combination of cutting and bending operation along a line in the work material.

Bending:

It is the shaping of material around a straight axis which extends completely across the material. The result is a plane surface at an angle to the original plane of the flat blankedcomponent.

Forming:

It is similar to bending except that the line of bend is along a curved axis instead of a straight one.

Drawing:

    In drawing a flat blank is transformed into a cup or shell.Shell or cup produced may be cylindrical or rectangular with straight or tapered.

Curling:   

It is an operation of rolling the edges of a sheet metal into a curl or roll. It improves the appearance of the piece part. It is also increase strength.

Bulging:

It is an internal forming operation used to expand portions of a drawn shell or tube.The more common media are rubber, urethane, oil, or water.