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Traditional Maritime Skills :: Punching

Punching

Introduction

Punching is one of the processes that a steel plate is subjected to before it can be riveted. Punching is a mechanical operation whereby enclosed contours are separated.

First we will look at which equipment and machinery the shipbuilder uses and in the second part we will explain the successive operations.

Tools, machinery and equipment for punching a steel plate

Steel plate
The holes from the template will be transferred onto this steel plate.

Chalk
Chalk is pulverised in a jute sack.

Template
The shipyard has a number of steel plates from which a "spits" is constructed. These plates act as a template for the plates which, after punching, undergo further processing before they can be riveted.

Procedure

Successive operations for punching

  • A hoist is used to transport the new steel plate to the template. The template is placed on top of the new steel plate.

  • The jute sack containing the chalk is tamped on the holes in the template. Chalk dust falls through the holes and forms small circles on the new plate.

  • The marked plate is inserted into the punch and the holes can be punched out at the marked positions.

  • Result.
 
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Tools Required

  • Chalk
  • Punch
  • Template

Materials Required

  • Steel plate

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