Closed die forging

CLOSED DIE FORGING PROCESS CAPABILITY MAP FOR LOW TO MEDIUM CARBON AND LOW ALLOY STEELS... 

Figure 4.51 Process capability map for closed die forging of steel...

Closed-die-forging Die forging Drop forging Hot forming Open-die-forging Stamping... 

Another common form is upsetting where again flat die are used as illustrated in Fig. 2. This process is often in conjunction with closed-die-forging. 

When large quantities of accurately shaped products are required, these are produced by a process known as closed-die forging or drop forging. With this method, the hot metal is placed between two halves of a die each containing a cavity such that when the metal is squeezed into the cavity a completed forging of the required shape is produced. Fig. 16.12. The metal is subjected to repeated blows, usually from a mechanical press, to ensure proper flow of the metal to fill the die cavity. A number of stages... 

Compression moulding High Medium Medium >1Q3 Parts similar to closed-die forgings primarily made from highly filled polymers with a high viscosity... 

Ti-5Al-2.5Sn, an a alloy, is used commercially in the fiiU range of forging products, e.g., open die forgings, closed die forgings, rings, etc., and is fabricated on all commercially available types of forging equipment. The forging process is used to fab-... 

Ti-6Al-6V-2Sii is a high-strength, highly beta-stabilized, deep-hardenable a-P alloy whose pri-maiy commercial application is in aerospace struc-tm al components. The alloy can be fabricated into all forging product types, although closed-die forgings predominate. 

Ti-15-3 is a very high strength, metastahle beta alloy whose primaiy commercial applications in forgings are aerospace and missile components, pressure vessels, and corrosion-resistant applications. The alloy can be fabricated into aU forging product types, althou closed die forgings predominate. 

A measured quantity of raw, unpolymerized plastic material is introduced into a heated mold which is subsequently closed under pressure, forcing the material into all areas of the cavity as it melts. Analogous to closed die forging of metals (see 2.3F). 

Closed die forging series of die impressions used to generate shape. 

Process capability charts showing the achievable dimensional tolerances for closed die forging using various materials are provided. Note, the total tolerance on Charts 1-4 is allocated -1-2/3, -1/3. Allowances of +0.3-+2.8 mm should be added for dimensions across the parting line and mismatch tolerances ranging 0.3-2.4mm, depending on part size (see 3.1CC). 

CLOSED DIE FORGING PROCESS 2. CLOSED DIE FORGING PROCESS... 

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