MD Seminar - GENERAL DESIGN RECOMMENDATIONS FOR FORGING Seminar By 1.Arun A 2.Arun Das C 3.Jeson M F 4.Kiran V 5.Laluprasad E 6.Lin John 7.Mahesh M

MD Seminar - GENERAL DESIGN RECOMMENDATIONS FOR FORGING...

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GENERAL DESIGN RECOMMENDATIONS FOR FORGING Seminar By: 1.Arun A 2.Arun Das C 3.Jeson M F 4.Kiran V 5.Laluprasad E 6.Lin John 7.Mahesh M 8.Raja Ram P K 9.Sivaprasad S 10. Sreejith S 11. Varun A
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FORGING Shaping of heated metal parts by plastic deformation, usually with one or more strokes of a power hammer or press. Power hammers - 1. gravity type 2. power assisted type Presses - 1. crank press 2. screw press 3. hydraulic press
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TYPES OF FORGING 1. Hand forging made by successive blows with simple die cavities. Operator manipulates work piece to form a fairly crude approx. of the finished part . 2. Blocker forging work piece is formed between two dies with shaped impressions in them. It closely resembles the finished part and are more refined 3. Conventional impression die forgings – more refined than blocker ones . It can be made from a blocker forging or directly from a heated metal billet.
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4. Precision forgings – they are further more refined. They are produced by a succession of forgings in dies with shaped impressions. Difficult to differentiate from conventional ones. 5. Cored forging – here additional die elements along with two opposing impression dies or clamping dies apply the metal forces. Rams or shaped dies act upon work piece forming may be an extrusion or upsetting. Here tighter design tolerances are possible. 6. Ring rolling – similar to hot rolling of bar or rod except that it progresses repetitively on the same piece of a metal which assumes a ring shape. Rectangular or contoured cross sections are produced. 7. Roll forging – here a relatively long, thin work piece is fed into power driven rolls which may be shaped to vary the section along its length.
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Characteristics of Forging Controlled grain structure sets forging apart from other processes. With proper design ,it is possible to align grain flow with directions of the principle stresses that will occur when the part is loaded in service. GRAIN FLOW is the directional pattern that metals crystals assume during plastic deformation. Strength ,ductility and impact resistance along the grain are significantly higher than they would be in randomly oriented crystals of cast metal or weld metal. Because hot working refines grain structure ,physical properties are also improved across the grain. Forging assures structural integrity from piece to piece. Internal pockets ,voids ,inclusions ,laps and similar flaws are easier to avoid by good forging.
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Applications of Forging There are two classes of application of forging: High strength to weight characteristics or high strength needed in a part. An economical means of producing the part configuraion required. Often these two classes overlap.
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  • Fall '16
  • MR BIJU CV
  • Forging, metal parts, grain flow, die closure tolerances

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