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2. Knockout punch - Wikipedia

   en.wikipedia.org/wiki/Knockout_punch

   Chassis punches: assorted sizes round and square Chassis punches: assorted sizes round and square disassembled. In metalworking, a knockout punch, also known as a chassis punch, panel punch, Greenlee punch, or a Q-max, [1] is a hand tool used to punch a hole through sheet metal. It is a very simple tool that consists of a punch, die, and screw.

3. Punching - Wikipedia

   en.wikipedia.org/wiki/Punching

   A die is located on the opposite side of the workpiece and supports the material around the perimeter of the hole and helps to localize the shearing forces for a cleaner edge. There is a small amount of clearance between the punch and the die to prevent the punch from sticking in the die and so less force is needed to make the hole.

4. Hole punch - Wikipedia

   en.wikipedia.org/wiki/Hole_punch

   A hole punch, also known as hole puncher, or paper puncher, is an office tool that is used to create holes in sheets of paper, often for the purpose of collecting the sheets in a binder or folder (such collected sheets are called loose leaves). A hole punch can also refer to similar tools for other materials, such as leather, cloth, or sheets ...

5. Punch press - Wikipedia

   en.wikipedia.org/wiki/Punch_press

   Quick change tool system (left: die; front: punch, split punch retainer; back: tool body; right: punch guide) A die set consists of a set of punches and dies which, when pressed together, form a hole in a workpiece (and may also deform the workpiece in some desired manner). The punches and dies are removable, with the punch being attached to ...

6. Types of press tools - Wikipedia

   en.wikipedia.org/wiki/Types_of_press_tools

   The compound tool differs from progressive and stage tools by the arrangement of the punch and die. It is an inverted tool where blanking and piercing takes place in a single stage and also the blanking punch will act as the piercing die. That means punch will be to the bottom side of the tool and piercing punches to top side of the tool.

7. Die (manufacturing) - Wikipedia

   en.wikipedia.org/wiki/Die_(manufacturing)

   Die set (plates). [5] Placement can be inverted depending on the operation, such as use of a knock-out: [6] Die block – the lower (bottom) half of the die set. Machined to conform to the desired shape of the workpiece being formed or cut. Punch plate – the upper (top) half of the die set. Holds and supports the different punches in place.