Question

how to produce a bolt using traditional methods ?

Answer 1

Bolts producing using traditional methods

They are five stages to produce bolt

1. Heading
2. External threading (rolling)
3. Heat treatment process
4. Tempering
5. Galvanization

1.Heading

• The first process is a cold foring process is called heading.
• It is used to produce a near net shape work billet.
• The ratio usually is limited to less than 3:1 but appropriate dies, it can be higher.
• The production method is probably used because cold heading has a very high production rate and produce virtually no waste material.The bar stock is fed into a machine called former. The bar stock is stopped and then gripped by a gripping die. The shape of the rounded head is based on which type die is used. Rounded headed shape form on bolt based on gripping die and it shaped in such a way that it forms a carriage along the neck of the stock whem its full gripping force applied on it.

2. External threading (rolling)

• The stage is thread rolling process is applied to the bottom of the work billet is a deformation process known as thread rolling.
• The thread rolling process is usually chosen over machining because thread rolling provides higher productions with accuracy.
• The type of process applied is cold forming process is used in cylinderical parts can easily have thread applied by rolling the work billet through two dies.

3.Heat treatment process

• Quenching is the mechanical process of heating and rapid cooling of workpieces (bolt) in water, oil, or ait to obtain certain material properties.
• Used to strengthening and harding of steel materials
• The material is then often tempered to reduced the brittleness that may increase from the quench hardness process.

4.Tempering

• Tempering is a process of heat treating which is used to increase the toughness of iron based alloys.
• Tempering is usally performed after hardenin to reduce some of the excess hardness.

5.Galvanization

• Galvaning is the process of applying a protective zinc coating to steel or iron to prevent rusting.
• The most common method is hot dip galvanizing in which parts are submerged in a bath of molten zinc.