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close this bookStraightening - Course: Technique of Working Sheet Metals, Pipes and Sections. Instruction Examples for Practical Vocational Training
View the document(introduction...)
View the documentPreliminary Remarks
View the documentInstruction Example 15.1. Bendings and Bucklings
View the documentInstruction Example 15.2. Twistings
View the documentInstruction Example 15.3. Bent Angle Section
View the documentInstruction Example 15.4. Bent Pipe
View the documentInstruction Example 15.5. Dented and Corrugated Metal Sheets

Instruction Example 15.5. Dented and Corrugated Metal Sheets

Practise the straightening of dented and corrugated sheet metal by means of the straightening hammer or the roller straightening machine.


Figure

Material

3 pieces (1) (2) (3) of steel sheet (380 MPa)


thickness: 3 mm


width: 300 mm


length: 400 mm

Tools and machines

Straightening hammer, roller straightening machine

Testing means

Surface plate

Auxiliary means

Straightening plate

Required previous knowledge

Manual material working: testing, hammering

Sequence of operations

Comments

1. Prepare the working place, make available the working material.

- Check for completeness.

2. Put the steel sheet which is damaged by small dents on the straightening plate and straighten the dents with the help of the straightening hammer.

- Part (1)


- Place the hammer blows directly on the dents.

3. Check the steel sheet for evenness.


4. Put the steel sheet that has a large dent on the straightening plate and place hammer blows around the dent in outward direction.

- Part (2)


Place the hammer blows closer together towards the rim of the steel sheet

5. Check the steel sheet for evenness.


6. Put the corrugated sheet on the straightening plate and strike hammer blows from the rim of the steel sheet inwards.

- Part (3)


- Place the hammer blows closer together towards the centre of the steel sheet.

7. Check the steel sheet for evenness.


If a roller straightening machine is available:

Shove the steel sheets that show deformations as mentioned under (2) and (3) through the roller of the straightening machine without any further manual treatment Check evenness.


Dented and Corrugated Metal Sheets