50results about How to "Reduce edge cracking" patented technology

The invention provides a method for preparing a high-silicon electric steel band material through rolling at medium and low temperature and belongs to the technical field of metal material preparation and machining. The method is characterized by comprising the following steps of: using a strong (100) oriented columnar crystal structure high-silicon electric steel bar blank or plate blank prepared by adopting a directional solidification as a blank material; before rolling, performing thermal treatment on the bar blank or the plate blank by a heating, quenching and stress-removing processes; preserving the temperature of the thermally treated blank for 10 to 20 minutes at the temperature of 300 to 500 DEG C, and after the blank is taken out from a furnace, rolling the blank to the thickness of 1 to 3mm at medium temperature; and after washing the rolled plate blank with acid and drying the rolled plate blank, performing cold rolling on the plate blank at room temperature, strictly controlling the deformation degree at each time, and repeatedly rolling the plate blank to the thickness of less than 0.30mm to obtain the cold-rolled band material. The method has the advantages that: due to the adoption of the new process of 'oriented solidification, thermal treatment before rolling, rolling at the medium temperature, and rolling at the room temperature' to prepare the high-silicon electric steel band material, annealing in the middle process is not required, the process flow is short, and the production efficiency is high; and the prepared high-silicon electric steel band material is bright in the surface, good in the plate shape, few in side cracks and high in yield.

The invention mainly belongs to the field of metal material preparation and machining and particularly relates to a rolling preparation method for a high-silicon electrical steel thin strip. The method comprises the steps of firstly, taking a high-silicon electrical steel casting blank heated in a furnace as the raw material, so that a high-silicon electrical steel plate slab is prepared and obtained, then conducting warm rolling on the high-silicon electrical steel plate slab in a stepwise-cooling mode, so that a high-silicon electrical steel warm-rolled strip is obtained, and conducting low temperature annealing and cold rolling on the high-silicon electrical steel warm-rolled strip, so that the high-silicon electrical steel thin strip is prepared and obtained. According to the rolling preparation method for the high-silicon electrical steel thin strip, warm rolling in a stepwise-cooling mode is adopted, the accumulated maximum warm rolling deflection is not influenced, meanwhile, the rolling temperature can be lowered, and a better toughening and plasticizing effect is obtained; after warm rolling is completed, annealing is conducted in the proper condition, residual tension of sides of the high-silicon electrical steel warm-rolled strip is effectively lowered, meanwhile, restoration of the ordered structure is avoided, and the cold rolling yield is raised.

The invention belongs to the technical field of metal material machining, and particularly relates to a casting roller design suitable for reducing edge crack of a magnesium alloy cast-rolled plate. For solving the problems of the edge crack and the non-uniform performance caused by cast rolling of the magnesium alloy plate, the invention provides acasting roller shape design capable of effectively inhibiting the edge cracking of themagnesium alloy cast-rolled plate, the design is used for guiding the production of thecast-rolled plate with the thickness of 6-10 mm, an upper roller and a lowerroller are involved and a hole shape is formed through the cooperation of the upper roller and the lower roller, the roller shape of the upper roller is in a dumbbell shape with a groove, the middleof the roller is a cylindrical shape, the two ends of the roller are the cylindrical shapes with the diameter larger than that of the column of the central part, the two ends of the columnin the middle are correspondingly provided with transition arc surface grooves with the depth of H, the lower roller is in the cylindrical shape, the radius of the lower roller is the same as the radius of the columnin the middle of the upper roller, the length of the lower roller is the distance between the two faces of the inner sides of the columns at the two ends of the upper roller, and the transition arc surfaceswith thedepth H which are the same with the roller shape of the upper roller exist at the two ends of the column. In the matching process of the upper roller and the lower roller, thespecialshape rolling hole shape is generated, so that the generation of the edgecrack can be effectively reduced.

The invention deals with the low carbon and the high manganese tropism electric armor plate and the producing process. The technical project is showed as follow: the new steel board embryo is heated to the temperature of 1200-1320, the temperature keeps 2-5 hours; the heat rolling, the quick cooling and the coiling are performed; the thickness of the board reaches below the 0.35mm according to the one cool rolling method; the decarbonization and anneal are performed, the magnesia separating layer is smeared to coiling, finally, the high temperature and the anneal are performed. The chemical elements of the board embryo are showed below: c is 0.004-0.030wt%, Si is 2.1-2.4wt%, Mn is 1.2-1.8wt%, ALs is 0.001-0.04wt%, Nb is 0.01-0.12wt%, N is 0.004_0.030wt%, P is 0.015wt%, the rest is Fe and the unavoidable impurity. The invention has many merits such as the low heating temperature, the low temperature of final anneal, the omitting of the rolling board melting (the anneal), the brief cool rolling process, the low quantity of the decarburization and the high ratio becoming the eligible production.

The invention discloses a temperature-controlled rolling technology of magnesium alloy coiled sheets. The steps comprise: (1) performing heating compensation on a magnesium coiled sheet and uncoiling the magnesium coiled sheet; (2) performing sheet heating compensation and adjusting turning directions of the magnesium alloy sheets; (3) measuring tension of the sheet and controlling a crimp force value; (4) performing integrated temperature control on a part which is to bite into the sheet; (5) performing gradient temperature control on the width direction of the part which is to bite into the sheet; (6) through a temperature-controlled roll, performing finishing rolling on the sheet and the sheet deforming; (7) measuring tension of the sheet and controlling a crimp force; (8) performing sheet heating compensation and adjusting turning directions of the magnesium alloy sheets; (9) performing sheet heating compensation and coiling the sheet in rolls; (10) if the thickness of the magnesium plate coil sheet does not reach the thickness (t0) of a target magnesium plate, reversely repeating the steps (1)-(9) on magnesium coiled sheets on a reversible temperature-controlled rolling mill according to the process steps, performing next temperature-controlled finish rolling processing; (11) if the thickness of the magnesium sheet reaches the thickness (t0) of the target magnesium plate, obtaining the magnesium alloy coiled sheet satisfying the thickness requirements.