The blank preparation process in the titanium plate processing process

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 the surface. At different heating temperatures, the structure and properties of the oxide film are different. The thermoforming of titanium plate is more complicated, and the mechanical properties of each batch are different. In order to ensure the quality of the material, the manufacturer has a certificate and test report.

1. The raw material supply status requirements for the preparation of titanium plates

One-time deformation of the titanium plate-after rolling into a Grade 9 Ti-3Al-2.5V Titanium Sheet, the performance repeatability is poor. The mechanical properties of the same composition of titanium plates produced at home and abroad are not small; the properties of plates produced by different domestic factories are not the same. Even the products of a factory have different mechanical properties with different heat numbers. Therefore, in order to ensure the quality of the parts, the quality of the raw materials should be ensured first. The titanium and titanium alloy sheets received from the warehouse shall have the factory certificate and the factory re-inspection certificate. In order to facilitate verification in the future, the certificate should be kept. When necessary, the workshop can make a record of the basic situation of the parts manufactured by each sheet for inspection.

All plates are required to be supplied in an annealed condition. In order to ensure the quality of the parts, the oxide layer and other pollution on the surface of the plate should be removed. The surface of the Grade 1 Pure Titanium Plate shall not have defects such as cracks, peeling, crushing, inclusions, and traces of pickling. The sheets should be straight and packed with paper out of the warehouse. In the subsequent process of blanking, forming, assembling, transportation and storage, care should be taken to prevent surface scratches.

2. Blanking of titanium plate

There are many similarities in the wool preparation methods used for various sheet metal parts. Since the thickness of the titanium plates used is generally less than 2 mm, and there are few parts with a thickness of 1.5 mm or more, the blanking of the titanium plates can be carried out at room temperature using existing equipment.

When cutting materials, care should be taken to make the edges of the wool as smooth as possible, especially to prevent defects such as cracks, gnaws and cut marks on the edges, and pay more attention when cutting thick plates.

The wool should be deburred and sharp edges removed before forming. As the titanium alloy plate is 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. It can be deburred or polished by filing, abrasive belt grinding or sandpaper.

It should be noted that no matter which method is used for blanking, only non-polluting ink and pens can be used when marking the line. Steel stamping is not allowed on the wool, and only offset printing or special labels can be used.

3. Degreasing and cleaning before forming

Before any thermoforming, grease or other contaminants on the surface should be removed to avoid contamination of titanium during heating. In addition, the oxide on the surface of the wool will reduce the plasticity of the material and should be removed before forming. Therefore, in order to reduce various influences in the atmosphere, vacuum quenching furnaces and vacuum annealing furnaces are generally used for heating. The inert gas in the vacuum furnace can protect titanium and titanium alloy materials from pollution during the heating process.