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close this bookBending - 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 14.1.: Mounting Angle
View the documentInstruction Example 14.2.: Half-round Bracket
View the documentInstruction Example 14.3.: Hasp
View the documentInstruction Example 14.4.: Double Pipe Knee
View the documentInstruction Example 14.5.: Beaker Jacket
View the documentInstruction Example 14.6.: Beaker

Instruction Example 14.2.: Half-round Bracket

Practise the folding and rounding of sheet metal on the vise with hammer and bending mandrel.


Figure

Material

Sheet steel

(380 MPa)

thickness:

2 mm

width:

20 mm

length:

90 mm, approx.

Tools

Steel scriber, centre punch, smooth file 200 mm (flat), machinist's hammer

Measuring and testing means

Steel rule, vernier caliper

Auxiliary means

Surface plate, straightening plate, vise, bending mandrel 0 20 mm

Previous knowledge required

Manual material working: Measuring, testing, scribing, punching, filing, shearing

Sequence of operations

Comments

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

Check completeness.

2. Check initial size and, if need be, rework, deburr and straighten.


3. Calculate stretched length (x), cut sheet to this length, deburr and straighten.

Subdivide total length into 5 partial lengths.

4. Scribe centre


on one side of sheet and scribe tang lengths on the other external side (20 mm).

Stage (1)

5. Fold clamped tangs.

Stage (2)

6. Place sheet on open vise and put bending mandrel on sheet centre (see scribed line) and strike with hammer.

Stage (3)


Vise opening:


Diameter of bending mandrel plus two times the sheet thickness.

7. Strike tangs planely in final position and straighten on straightening plate.

Stage 4

8. Check bending.

- Evenness on surface plate


- Angularity


- Accuracy to size


- Shape

9. Drill workpiece.



Half-round bracket