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For many metal parts, there are generally two ways of casting and forging, casting is mainly suitable for those parts that are not high in precision and quality requirements, but forging is different, forgings are more excellent than castings, because castings do not change the original structure and mechanical properties of the metal, its fibrous structure increases the strength and toughness of the gold. It is very suitable for those parts that are easy to wear, and forging is more conducive to welding deformation plasticity and other operations, and after these steps, its performance will not change a lot. Therefore, the application of forgings in modern industry is very extensive.
But at present, the forgings on the equipment requirements are relatively high, the larger the scale of the forgings, the higher the requirements for equipment, and there are still greater difficulties in the manufacturing of forging equipment in China, although there are breakthroughs, but from the world’s advanced level there is still a big gap, so choose forgings should pay attention to choose those strong forging plants, That’s the guarantee.
The forging edge of titanium alloy processing must meet the following requirements:
(1) The incision is smooth, and the metal on the blank shall not fall.
(2) The part adjacent to the blank incision surface shall not have cracks, nor shall there be uneven grain size caused by uneven cutting deformation.
(3) There shall be no impression of the convex die on the blank of the cut edge, and the convex die and the part should be completely consistent in appearance.
For small batch sizes, the edge can be cut with a milling machine or with a band saw and specially designed friction plate. For large forgings and thick rough edges, regardless of the size or batch of parts, it is inconvenient to hot cut edges, and flame cutting is an effective method. Raw edges 50mm or thicker can be cut successfully and economically using oxygen-gas, plasma and other technologies, and the flame cutting should be followed by heat treatment to make the heat affected zone machined. For large quantities of medium and small titanium alloy forgings, the die is usually used on the crank press, and the cutting edge is carried out at 600~800 ℃. If the trimming must be corrected immediately after trimming, the trimming temperature should be close to the upper limit. Titanium alloy is rarely cut with mold in cold state, because the rough edge is very hard and brittle, easy to cause uneven incision, and even cause the risk of metal cracking and debris splashing. For some highly alloyed alloys, cold edging will cause cracks in the shear surface, and the cracks will sometimes expand into the metal.