Causes and control of cold-rolled titanium surface defects
Titanium
and titanium alloy is extremely important lightweight construction materials,
widely used in aerospace, vehicle engineering, biomedical, etc., has been the
focus of materials research. With the development of economy and technology,
there has been more and more applications of titanium sheet, but the
corresponding questions from its surface quality becomes more prominent.
Titanium surface defects are defects of conventional and unconventional defects
into two categories. Conventional defects are: 1 scratch Reason: guides,
roller, tools, and roll does not finish, adhesion or angular burr, rolling
scratch the surface; not careful when operating, so that collide with each
other to form a scratch the surface. Measures: a good tool to check before
rolling, guides, roller and roll, etc., identify problems and timely removal;
careful operation, do not Luanla rattling.
2 metal pressed into the matter
Reason: rolling burr and tail edges are pressed into the surface of the
product dregs. Measures: timely
elimination of the slab edge burrs and surface foreign matter. Crack edge crack
head promptly cut off. 3. The non-metallic
objects pressed into The reason: poor
sanitation, dust foreign body falls rolling surface; after pickling, cleaning
is not clean. Measures to: improve health, the timely removal of the rolling
surface adhesion properties. 4 pits
pitting The reason: the pressure orthopedic annealing, plate or pad surface
dust foreign body. Measures: into the blast furnace and the timely removal of
the platen surface of the pad. 5. roller
marks The reason: the roll surface badly
worn, pitted, pockmarked face, scratches, etc.; roll surface is pressed out of
the pit board angle. Measures: find roller
marks, to repair or replace the grinding rolls. Unconventional defects: 1 Table bifida Reason: incoming unqualified,
surface cracks are not cleaned or incoming suction surface brittle layer is not
clear, another draft schedule is unreasonable, a small pass processing rate,
way too many times, or pass processing rate of inequality. Measures: strict
control of incoming surface quality, reasonable distribution of pass processing
rate guarantee slab annealing temperature uniformity, enhanced rolling lubrication. 2 acid spot The reason: one is pickling, the
residual acid is not clean, dry sheet formation. One is a crib sheet during
annealing, surface oxidation uneven surface extent of corrosion caused by
inconsistent after pickling. Measures: Always clean pickling ensure that no
residual acid plate surface and then dried; reduce stacking thickness to ensure
uniform sheet annealing; sanding process can also be used for post-save
processing.
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