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Blank preparation process during titanium plate processing
Titanium is a very active metal element that acts with all elements. Titanium interacts with oxygen during heating and forms an oxide film on the surface. The structure and properties of the oxide film are different at different heating temperatures. The forming of titanium plates is complicated, and the mechanical properties of each batch are not the same. In order to ensure the quality of materials, manufacturers have certificates and test reports.
1. Preparation of titanium plate for raw material supply status requirements
One deformation of the titanium plate----rolling into a sheet metallurgical plant, the performance repeatability is poor. Titanium plates of the same composition produced in China and abroad have different mechanical properties. The performance of titanium plates produced in different factories in China is not the same. In time, the mechanical properties of different furnaces are different. Therefore, in order to ensure the quality of the parts, the quality of the raw materials should be guaranteed first. Titanium and titanium alloy sheets used from the warehouse should be provided with the manufacturer's factory certificate and the factory's re-inspection certificate. In order to facilitate verification in the future, the certificate should be kept. When necessary, the workshop can record the basic conditions of each part of the board for inspection.
All sheets are required to be supplied in an annealed condition. In order to ensure the quality of the parts, the oxide layer and other contamination on the surface of the board should be removed. The surface of the titanium plate shall be free of cracks, peeling, folding, inclusions and other defects, as well as pickled marks. The sheet should be straight out of the package. In the future process of cutting, forming, assembling, transporting and storing, care should be taken to prevent surface scratches.
2. Titanium blank blanking
There are many similarities in the method of preparing blanks for various sheet metal parts. Since the thickness of the titanium plate is generally less than 2 mm, and the number of parts which are all above 1.5 mm is small, the blanking of the titanium plate can be performed at room temperature using the existing equipment.
When cutting, care should be taken to make the edges of the wool as smooth as possible. In particular, it is necessary to prevent cracks, bruises and cracks on the edges.
The burr should be removed and the sharp edges removed before the wool is formed. Since the titanium plate is highly sensitive to crack propagation, this work is extremely important to eliminate stress concentration and prevent the wool from cracking and scratching the mold during forming. Deburring or polishing, such as boring, belt grinding or sandpaper.
It should be noted that no matter which method is used for blanking, only ink and pen that do not produce pollution can be used when marking, and it is not allowed to print on the wool, and only the offset printing or special labeling is allowed.
3. Degreasing and cleaning before forming
Before any thermoforming, the surface grease, or other contaminants, should be removed to avoid contamination of the titanium during heating. In addition, oxides on the surface of the wool reduce the plasticity of the material and should be removed prior to forming. Therefore, in order to reduce various effects in the atmosphere environment, vacuum quenching furnace and vacuum annealing furnace are generally used for heating, and the inert gas in the vacuum furnace can protect the titanium and titanium alloy materials from contamination during heating.
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