Monday, 24 February 2014

Cold forming

 cold forming

Work Hardening also referred commonly as cold working or strain hardening process leads to strengthening of metal by its plastic deformation. The strengthening of metal is caused by the dislocation movements and dislocation generation occurring within the crystal structure of material. In metal-working processes, work-hardening stimulates plastic deformation to exact a shape change in metals. This is characterized by shaping the workpiece at temperature below its recrystallization temperature; usually at ambient temperature.  At any time, the effects induced by work-hardening can be reversed by process called annealing carried at high temperatures, where recovery and recrystallization reduces the dislocation density.
Cold working can be applied to numerous non-brittle metals having high melting points as well as to several polymers to strengthen them.  Other ,metal-alloys which cannot be amended by heat-treatment such as low carbon steel is also frequently hardened. Metals like copper and aluminum are most frequently work-hardened at normal temperatures.
Cold forming techniques are mostly classified into for major categories:
  • Drawing
  • Squeezing
  • Shearing
  • Bending
These applications generally produce final products like blots and screws and also finished cold rolled steel. Cold forming processes involve metal-working at high speed and high pressure using carbide dies or toll steel. Cold working is advantageous to metal-working as it increases the yield strength, hardness and tensile strength of work-piece. The further sections speak on the advantages as well as disadvantages of cold-forming process.
Read further on http://www.wiredrawingdies.co.in/cold-forming/. You can check our other products and services on www.wiredrawingdies.co.in

Hot Forming

 Hot forming

Hot working refers to process where metals undergo plastic deformation at temperatures above their recrystallization point. This helps achieve the material to recrystallise during deformation. This is essential as recrystallization prevents the material from strain hardening, thereby preserving the yield-strength and low hardness along with high ductility of the material. This differentiates hot working from cold working.

Temperature for Hot Working:

The lower limit for hot working is determined on basis of its recrystallization temperature which is generally 0.6 times of it melting point on an absolute temperature scale. On other hand, upper limit for hot working depends on numerous factors including grain growth, excessive oxidation or an undesirable phase transformation. While hot forming, materials are generally heated to upper limits to minimize forces as well to gain maximum time to hot work the workpiece.
However after attaining the desired hot forming temperature it is equally essential to maintain this temperature. Most of the heat during heat forming is lost through surface of workpiece to cooler tooling around. This causes temperature gradients in workpiece which can lead to cracking in the cooler, lesser ductile surfaces. Hence, in majority of cases tooling is heated. Hotter the tooling, lesser would the heat be lost. Keeping all these conditions in consideration, ideally hot working is performed around 325-450C. The lower limit for hot working for tin is room temperature whereas is 2000F for steel and 4000F for tungsten.
Some major hot forming processes include:
You can read further on http://www.wiredrawingdies.co.in/hot-forming/. Please visit www.wiredrawingdies.co.in for more details on our products and services.

Monday, 17 February 2014

Metal Rolling

 Metal Rolling

In today’s modern metal-world one can never lose foresight of metal rolling processes. Metal rolling is used in majority of metal-working processes making it the most important manufacturing process. In their manufacture, metals undergo rolling atleast at one point before final usage. Metal rolling is majority of times the first step in making raw materials for further final product manufacturing. For example, the ingot or continuous casting is hot rolled into bloom or slabs, which act as basic structures for further usage. Rolling is most commonly carried at hot temperatures for better results.
Read more on http://www.wiredrawingdies.co.in/metal-rolling/. Please visit our website www.wiredrawingdies.co.in for other product details.
Source: www.wiredrawingdies.co.in

Stamping dies

Sheet metal stamping dies are used to produce high precision metal components which are identical in shape and size. The dimensional accuracy and stability which you can achieve using precision metal stamping dies are very high and thus metal stamping dies are integral part of any manufacturing industry.  Stamping die manufacturing involves step by step operations starting from design study, planning, pre-machining, heat treatment, final machining, bench fitting and assembly. Dies also can contain cutting and forming sections made from carbide or various other hard, wear-resistant materials.
Stamping dies can be a simple single stage tool where a component or operation is completed in every stroke of the stamping die or it can be a progressive stamping die where a series of various stamping techniques are performed in different stages to produce complex shaped metal stamping parts.
Whether you need dies and/or punches for stamping, trimming, forming, drawing or any other purpose, Bharat Industriescan help you find a solution that will offer increased productivity and longer life, reducing down time and saving you money. Please visit our website www.wiredrawingdies.co.in for other details. 

Tuesday, 11 February 2014

Geometry of Extrusion Dies

 Extrusion Dies & Tips

A finest choice of tool steel along with optimum heat treatment has to be selected for elongating lifespan of Extrusion dies & tooling which are continuously subjected to extreme thermal conditions during extrusion. These harsh thermal conditions are generated not only through heated billet but also by deformation and friction the dies go through.  Also, to add to the heat is the high pressure under which the process is carried. Particularly, in aluminum extrusions, a hard oxide film formed immediately on the surface of the extruded metal, causes considerable die-abrasion.
Bharat Industries takes proper care of above said factors while preparing Extrusion Dies. We ensure that at die-designing stage, there is proper allowance for elastic deformation and shrinkage. We also take care that the die-profile remains straight when used for extrusion of complicated profiles, as it would be subjected to highly uneven velocity distribution at that time
Bharat Industries with its 30 years of experience in Extrusion Process along with its extensive process understanding and system competence of our specialists, can provide you high-quality extrusion dies to achieve utmost results in extrusion. Read more on http://www.wiredrawingdies.co.in/product/extrusion-dies.
Please visit our website www.wiredrawingdies.co.in for more details.

Extrusion Dies & Tips

 EXtrusion Dies & Tips

Extrusion Dies are used in processes involving pushing of slug through the die to generate the desired cross-sectional area. Extrusion can be carried out on different products at range of temperatures to attain various desired properties of extruded product.

Bharat Industries with its 30 years of experience in Extrusion Process along with its extensive process understanding and system competence of our specialists, can provide you high-quality extrusion dies to achieve utmost results in extrusion. Read more on http://www.wiredrawingdies.co.in/product/extrusion-dies.
Please visit our website www.wiredrawingdies.co.in for more details.