With the development of economy and technology, there are more and more applications of titanium plate, but accordingly its surface quality problems appear more prominent.
Titanium and titanium alloys are extremely important lightweight structural materials, widely used in aerospace, vehicle engineering, biomedical and other fields, has always been the hot spot of materials research. With the development of economy and technology, there are more and more applications of titanium sheet, but accordingly its surface quality problems appear more prominent.
The surface defects of titanium plate have two categories: conventional defects and unconventional defects. Conventional defects are:
1, scratches
Reason: guide plate, roller, tools and rollers are not polished, there are adherents or angular burrs, etc., rolling scratched surface; operation is not careful, so that they collide with each other to form a scratched surface.
Measures: before rolling to check the tools, guides, rollers and rollers, etc., found that the problem of timely removal; operation carefully, do not pull and collision.
2, metal indentation
Reason: the edge of the rolled parts burrs and tail drop slag is pressed into the product surface.
Measures: timely elimination of slab edge burrs and surface foreign matter. Cracked edge, cracked head cut off in time.
3,Non-metal indentation
Reason: poor environmental health, dust and foreign matter falling on the surface of the rolled parts; after pickling, cleaning is not clean.
Measures: improve health, timely removal of adherents on the surface of the rolled parts.
4, pockmarked pockmarks
Reason: the pressure of orthopedic annealing, pressure plate or pad surface dust foreign matter.
Measures: remove the surface of the pressure plate and pad plate in time before entering the furnace.
5, roll marks
Reason: serious wear and tear on the surface of the roll, there are pits, pockmarks, scratches, etc.; the surface of the roll is cratered by the corner of the plate.
Measures: When roll marks are found, the rolls should be repaired or replaced.
Non-conventional defects are:
1,Surface crack
Reason: the incoming material is unqualified, the surface cracks are not removed cleanly or the incoming material surface brittle suction layer is not removed, in addition to the press down protocol is unreasonable, the channel processing rate is small, too many channels, or the channel processing rate is unevenly distributed.
Measures: Strictly control the surface quality of incoming materials, reasonable distribution of channel processing rate, to ensure uniform annealing temperature of slabs, and enhance rolling lubrication.
2, acid spot
Reason: one is pickling, residual acid is not rinsed clean, plate drying formation. One is the plate in the stack annealing, surface oxidation is not uniform, after pickling surface corrosion degree is not consistent.
Measures: pickling must be clean, to ensure that the surface of the plate without residual acid and then drying; reduce the thickness of the stack, to ensure that the plate annealing uniformity; can also be used to sanding treatment, to save the treatment later.
