Meiban Engg

Punch Holder

The standard punch holder (style 114) is configured as a self-stripping tool by combined with urethane stripper. Made of special steel, heat treated and ground, this punch holder is constructed so that is can be used with either round or non-round punches except in the X or A station. Except for the X or A stations, all stations employ a hardened and ground finished key that is fitted to the key groove in the turret hold for correct radial positioning of the punch holder.

Die Holders

There are two types of die holders (style 114) used in the Wiedemann Turret Punch Presses, the quick-change and self-aligning die holders.

Features of Vulcan Tools

• The vulcan tool permits stable punching even on 9.5 mm-thick work sheets.
• Selecting a stripper material suitable for the work sheet material will prevent damage to work sheets and lower punching noise.
• The vulcan tools are applicable to all the stations from X to J.
• The vulcan tool uses a die commonly used for the style 114 tool (Murata’s standard tool).
• Combined use of strong and high-quality springs made of chrome vanadium steel allows the work sheet to be strongly clamped and stripped.

• The rate of clearance to the board thickness for every quality of the material is shown in the following table.
• In the case of the thick board, in consideration of the influence of clearance, a slight size is suitable.
• Suitable die clearance = Thickness × 0.18 (The mean value in the case of SPCC)
• A Murata standard clearance table takes into consideration influence / standing stock of clearance etc.
• When the model late sets up punch speed, cautions are required in order that the same influence as the conditions that made clearance small may come out. Suitable die clearance here is the case where punch speed is the fastest.

The rate of clearance to the thickness of the material (Standard):

Press Tonnage Calculation

In case of punching tools, the amount of tonnage necessary for punching depends on the outer circumference of the punch, the thickness of the material, and the type of material (shear resistivity). When punching with shear, the load will be reduced.

Without Shear Angles

With Shear Angles

Shearing coefficient

Standard 114 style punch for D station and above have shears with a height of 2.4 mm.

Shear Coefficient varies depending on the height of the shear and the thickness of the work sheet and are given a table at the time of a sheer height of 2.4 mm.