Titanium plate is extremely important light structural material, with the development of economy and technology, there are more and more application of titanium plate, but the corresponding to the surface quality problem is more prominent, the titanium plate and surface reaction layer is the main factor that affect the physical and chemical properties of titanium artifacts, before processing, must achieve completely remove surface contamination and defect layer.
Titanium plate surface defects have conventional defects and unconventional defects two categories.
Unconventional defects are:
1, the table split
Reasons: unqualified incoming materials, surface cracks are not cleared or the fragile suction layer on the surface of incoming materials is not cleared, in addition, the pressure regulation is not reasonable, the processing rate of trace times is small, trace times are too many, or the distribution of trace times processing rate is not equal.
Measures: strictly control the surface quality of incoming materials, distribute the processing rate reasonably, ensure the annealing temperature of the slab is even, enhance the rolling lubrication.
2, acid spot
Reason: a kind is when pickling, residual acid is not washed clean, sheet drying form.One is the plate in the annealing into the pile, the surface oxidation is not uniform, after pickling surface corrosion degree is not consistent.
Measures: pickling must be clean, to ensure no residual acid surface drying;Reduce stack thickness to ensure uniform annealing of sheet;Also can use sanding treatment, to save the late treatment.
Conventional defects are:
Reason: guide plate, roller table, tools and roll are not smooth, adhesive or angular burr, rolling scratch surface;Careless operation, so that the collision form scratch surface.
Measures: check the tools, guide plate, roller table and roll before rolling, and clear away the problems in time;Careful operation, do not disorderly pull disorderly bump.
2. Metal presser
Reason: the burr at the edge of the rolled part and the dross at the end are pressed into the surface of the product.
Measures: remove burrs and surface foreign bodies on the edge of slab in time.Split edge, split head cut off in time.
3. Non-metallic presser
Reasons: poor environmental hygiene, dust foreign body fell on the surface of the rolled part;After acid washing, the cleaning is not clean.
Measures: do a good job of hygiene, remove the surface adhesion of rolling parts in time.
4, roller mark
Reason: roll surface wear serious, there are pits, pockmarks, scratches, etc.;The surface of the roll is hollowed out by the corner of the plate.
Measure: find roll mark, want to repair grind or change roll.
5. Pits and spots
Cause: dust and foreign matter on the surface of pressing plate or backing plate during annealing.
Measures: before entering the furnace, remove pressing plate and backing plate surface in time.