Titanium is a very active metal element that can interact with all elements. When heated, titanium can interact with oxygen to form an oxide film on its surface.The structure and properties of oxide films are different at different heating temperatures.The hot forming of titanium plate is more complicated, and the mechanical properties of each batch are different. In order to ensure the quality of materials, the manufacturer has prepared certificates and test reports.
1. Raw material supply requirements for titanium plate preparation
Primary deformation of titanium plate - rolled into plate in metallurgical plant, the performance of the repeatability is poor.The mechanical properties of domestic and foreign titanium plates with the same composition differ greatly.The performance of the plates produced by different factories in China will not be the same. Even if the products of a factory are manufactured with different furnace Numbers, their mechanical properties will be different.Therefore, in order to ensure the quality of parts, the quality of raw materials should be ensured first.Titanium and titanium alloy sheet materials obtained from the storehouse shall be provided with the factory's ex-factory qualification certificate and the factory's re-inspection qualification certificate.The certificate of conformity shall be kept for easy verification in the future.When necessary, the workshop can make a record of the basic situation of each sheet metal manufacturing part for reference.
All plates are required to be supplied in annealed condition.In order to ensure the quality of parts, oxidation layer and other pollution should be removed from the surface of the plate.The surface of titanium plate shall be free from cracks, peeling, folding, inclusions and other defects, as well as the traces of pickling.Sheet material should be straight and wrapped paper out of storage.In the future blanking, forming, assembly, transportation and storage process, should pay attention to prevent surface scratches.
2, titanium plate blank blanking
There are many similarities in the preparation methods of wool used in various sheet metal parts.Due to the use of titanium plate thickness is generally below 2 mm, and the thickness of 1.There are very few parts above 5 mm, so the discharge of titanium plate can be carried out with the existing equipment at room temperature.
When cutting, should pay attention to make the wool edge as smooth as possible, especially to prevent the edge of cracks, gnaw and shear marks and other defects, in the shear plate should pay more attention.
Wool should be deburred and sharp edges removed before forming.Because the titanium plate is sensitive to crack growth, this work is very important to eliminate stress concentration and prevent the wool from cracking and scratching the mold during forming.Can be used to file, belt grinding or sandpaper burr or polishing.
It should be noted that no matter which method of blanking, in the line, only use no pollution of ink and pen, in wool is not allowed to make steel, only make offset printing or specially equipped with labels.
3. Oil removal and cleaning before forming
Grease, grease, or other dirt should be removed from the surface before any thermal molding so as not to contaminate the titanium during heating.In addition, oxides on the surface of the wool reduce the plasticity of the material and should be removed before forming.Therefore, in order to reduce various influences in the atmosphere, vacuum quenching furnace and vacuum annealing furnace are generally used for heating. Inert gas in the vacuum furnace can protect titanium and titanium alloy materials from pollution in the heating process.