HAND OPERATED SINGLE DIE PUNCHING MACHINE

For applications of: perforating, shearing, joining or edge clearing.

Can be used for:

Perforations of aluminum profiles in the fabrication of windows, doors, shop fronts, etc. Steel, Aluminum and light metals Mechanical industry Electronic industry Jewelry industry Light materials industries – Paper, Textile, Wood

 a new design hand press grommet machine enables the

grommet press to pierce and set a grommet in a single action without pre-punching a hole. And the self-piercing die will help you to operate simply and conveniently, just keeping the eyelet attaching the top die and the washer

attaching the bottom die.

This hand press grommet also applies to the plastic grommet only if you punch a hole on the material firstly.

A foam box contains handle, grommet machine body ,self-piercing die, allen key, four sets of screws and one small

package of trial grommets.

DIFFERENT TYPES OF HAND OPERATED MANUAL PUNCHING MACHINE AT WORK.

Claims

1. A hand operated punching device for punching apertures in a sheet, the hand operated punching device comprising:

a housing having a base forming a gap for receiving a sheet therein;a drive plate slidably displaceable in the housing in a plane parallel to the base, the drive plate having protrusions extending from a surface, wherein the drive plate protrusions are spaced apart in two dimensions, a first spacing between protrusions along the direction of the drive plate displacement and a second spacing perpendicular to the first spacing and in a plane parallel to the base;a plurality of punch assemblies disposed in the housing, each punch assembly comprising a punch disposed in a recess of the housing and operably engaging one of the protrusions of the drive plate such that displacement of the drive plate in the housing causes displacement of the punch toward the base and into the gap; anda handle operating the punch assemblies through actuation of the drive plate, the handle having a first end pivotally joined to the housing and operatively joined to the drive plate to selectively displace the drive plate with pivotal displacement of the handle.

2. The punching device of claim 1 wherein each punch assembly includes a spring for retracting the punch back into the housing.

3. The punching device of claim 2 wherein the drive plate slides over the recesses of the punches.

4. The punching device of claim 3 and further comprising a drive shaft joining the handle to the drive plate.

5. The punching device of claim 4 wherein the drive shaft is removable from the drive plate.

6. The punching device of claim 5 wherein the drive plate includes selected bearing surfaces for slidably engaging the housing.

7. The punching device of claim 6 wherein each punch assembly includes a roller for engaging one of the protrusions of the drive plate.

8. The punching device of claim 1 wherein the housing includes a step assembly in the gap, the step assembly having a plurality of surfaces spaced-apart and facing a lower surface of the housing, the plurality of surfaces being of increasing height.

9. The punching device of claim 1 wherein the drive plate is pivotally joined to the handle.

10. The punching device of claim 1 wherein the drive plate is pivotally joined to the handle with a second pivot connection remote from the first-mentioned pivot connection.

How to Calculate the Tonnage for a Punch Press/Die

In metalworking, a punch press refers to any device that cuts holes into a sheet of material. While hand-operated models still exist, punch presses commonly employ automated computer-numerical control (CNC) systems coupled will hydraulic pistons capable of a generating hundreds of tons of force. To determine the force or tonnage that a press's hydraulic system must exert in order to cut metal with a particular die, you need to consider shear strength and thickness of the metal as well as the circumference or perimeter of the die.

Skill level:

1. 1Determine the material factor for the target sheet metal material (see Resources).

2. 2Measure the entire perimeter of the die in millimetres with the measuring tape.

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3. 3

Measure the thickness of the target sheet metal in millimetres.

4. 4Determine the shear factor for the surface of the die (see Resources).

5. 5Multiply the material factor by the die's perimeter.

6. 6Multiply the result from Step 5 by the sheet metal's thickness.

7. 7Multiply the result from Step 6 by the die's shear factor. This will give you the force required by the punch press, in kilonewtons (kN).

8. 8Multiply the result from Step 7 by 0.102 to convert its units from kilonewtons to metric tons.