Mechanical Engineering - Workshop Technology - Discussion

Usually drawing is done cold.

Maximum reduction in cross-sectional area per pass of drawing is restricted to 45%. Beyond this reduction, tensile stress may increase and surface finish may become poor.

Due to large stress involved in drawing, the drawn wire gets strain hardened. Therefore, intermediate annealing is required before next stage of drawing.

Thanks @Khdw.

A is the right answer.

I think A is correct answer.

For this question, A is the correct answer.

But if it asked, "in the tandem drawing of wires and tubes what is necessary?".

Then, of course, it will "B".

Thanks for explaining it @Khdw.

A will be the right answer.

I think it is not possible to reduce at one stage is correct one.

Tandem drawing is the drawing force of the process through two dies in tandem was evaluated by being compared with the drawing force of a conventional drawing process.

Tandem drawing of wires and tubes is necessary because Annealing is needed between stages.

The correct answer is accuracy in dimensions is not possible otherwise.

Tandem drawing, or multi-stage drawing, is a process where wire or tube is drawn through a series of dies in a single pass to achieve the desired shape, size, and accuracy. This process is necessary because;

- Achieving the desired dimensions and tolerances in a single drawing stage is often not possible, especially for complex shapes or tight tolerances.
- Tandem drawing allows for a gradual reduction in size and shape, enabling better control over the final dimensions.

While the other options are not the primary reason for tandem drawing:

- Annealing may be necessary between stages to relieve stresses and prevent material failure, but it's not the main reason for tandem drawing.
- Surface finish does improve with each drawing stage, but this is a secondary benefit.
- Reducing material thickness or cross-sectional area in a single stage is possible, but tandem drawing provides more control and accuracy.

Tandem drawing is commonly used in the production of precision tubes, wires, and rods for applications like:

- Aerospace.
- Automotive.
- Medical devices.
- High-performance engineering components.