The cause of defects in the titanium plate during rolling
With the development of economy and technology, titanium plates are extremely important lightweight structural materials. More and more applications of titanium plates have emerged, but the surface quality problems have become more prominent. Titanium plates and surface reaction layers are the main factors affecting the physical and chemical properties of titanium workpieces. Before processing, it is necessary to completely remove the surface contamination layer. And defective layers.
Unconventional defects are
The surface crack was not cleaned or the brittle suction layer on the incoming surface was not removed. The reason was that the incoming material was unqualified. In addition, the pressing procedure is unreasonable, the processing rate of the pass is small, the number of passes is too large, or the processing rate of the pass is unevenly distributed. Reasonable distribution of pass processing rate, measures: strict control of the surface quality of incoming materials. Ensure that the slab annealing temperature is uniform and enhance rolling lubrication.
2. Acid spots
The residual acid was not rinsed out. Reason: One is when pickling. The plate is dried to form. One is that when the sheet is annealed, the surface is not uniformly oxidized, and the degree of surface corrosion after pickling is inconsistent. Ensure that the surface of the board is free of residual acid and then dry; reduce the thickness of the stack. Measures: Pickling must be clean. Ensure that the sheet is annealed uniformly; it can also be sanded for later salvage treatment.
Conventional defects are
There are adhering or angular burrs, etc., because the guides, roller tables, tools and rollers are not smooth. Rolling scratched surfaces; not careful during handling, causing them to collide with each other to form a scratched surface. Found problems in time to clear; careful operation, measures: check tools, guides, roller tables and rolls before rolling. Don't mess around.
2. Metal indentation
Reason: The burrs on the edge of the rolled piece and the tail slag are pressed into the surface of the product. The split head is cut off in time. Measures: Eliminate burrs on the sides of the slab and surface foreign matter in time. Cracked edge.
3. Non-metallic indentations
Dust foreign matter falls on the surface of the rolled piece; after pickling, the reason is: poor sanitation. The cleaning is not clean. Timely removal of adherends on the surface of the rolled stock. Measures: Do a good job of hygiene.
4. Roll marks
There are pits, pockmarks, scratches, etc.; the surface of the roll is pressed out of the pit by the corners of the plate. Cause: The surface of the roll is heavily worn. To grind or replace the rolls. Action: Spot marks were found.
5. Ma pit pit
There are dust foreign objects on the surface of the pressure plate or the pad. Cause: During orthopedic annealing. Measures: Remove the surface of the pressure plate and the backing plate in time before entering the furnace.