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In order to make the hot shape correction successful, you must choose the appropriate heating temperature, holding time and forming pressure. The pressure to parts during the hot shape correction, as long as it can guarantee that the parts can be pressed in the mold, it didn't have obvious effect to the chandelier. On the contrary, it may lead to the mold and table shaped. So the main factors of effecting the thermal correction are temperature and time, and temperature is the decisive factor. In order to successfully eliminate the rebound, we can only do it in a certain temperature. The so-called thermal specification mainly is to determine the temperature and time. Generally speaking, the suitable thermal specification of some titanium plate forming must ensure that the parts after the shape correction meet the following basic requirements:
1. The mold sticking of parts is good, and it basically didn't deed the manual trim. The shape, size and surface quality must meet the inspection requirements of titanium plate parts;
2. The mechanical properties of materials is basically stable, the main performance indicators at room temperature and the use temperature meet the provisions;
3. The residual internal stress of parts is basically eliminated;
4. The average hydrogen content of hot sizing material can't exceed 150p.m;
5. The total thickness f the oxide skin and permeability reservoir can't exceed half of allowing negative deviation of the sheet material thickness;
6. The microstructure of the material didn't have any change, and the grain didn't have obvious swell and superheating and other phenomenon;
7. In the premise of satisfying the above requirements, temperature should be as low as possible, time should be as short as possible, pressure is appropriate that ensure the parts can be pressed.
The shape correction specification test is carried out in domestic RX - 1 machine. The material is TA2 and TC1, the thickness is 0.5, 0.8 and 1 mm. The thermocouple can indicates the mold or temperature of work area, and the temperature can be controlled within + 10 ℃. What's more, time is controlled by the time relay. The time should be calculated from the specimen put into mould or the working chamber to remove the date.
Now we will emphatically explain the forming accuracy problem. The forming accuracy is the most basic requirements of parts of compaction, is the main index to measure whether the temperature, time specification is appropriate. The method of judging the forming accuracy is measuring the degree of mold sticking for parts after cooling to room temperature that is the residual quantity of spring back. First, we can take the arc wide sheet bending part as an example. It can represent a kind of parts whose plane curvature correction is small, and shape requirements are accurate.   The relative bending radius (such as the relative bending radius before rebound is R / T = 200) of this kind of part is larger. If we take the elastic modulus E = 10500 kg / mm2; yield limit of TA2 alpha 0.2, taking 40.5 kg/ mm2 , for TC1, taking 60.5 kg / mm2.
To sum up, in the basic premise of keeping the forming accuracy, the specification of the hot shape correction of titanium plate can be initially confirmed.