31results about How to "Control surface quality" patented technology

The invention relates to 37Mn5 steel. The 37Mn5 steel is characterized by containing less than or equal to 15ppm of O, less than or equal to 0.015 percent of P and less than or equal to 0.010 percent of S; the center porosity is less than or equal to level 1.0; the steel has no visual shrinkage cavities, bubbles, cracks, inclusions, skull patches or white spots; and the sum of nonmetallic inclusion levels is less than or equal to level 3, the banded structure is less than or equal to level 2, and the granularity is level 6 to 8. A production technology of the 37Mn5 steel comprises the following processes of: (1) converter treatment, (2) refining, (3) continuous casting, (4) steel rolling and (5) finishing. The 37Mn5 steel can be used for producing thin-wall pipes.

The invention discloses a small-size LED copper strip production process, and belongs to the technical field of the copper strip production process. The production process includes the following stepsof (1) smelting and ingot casting, (2) hot rolling, (3) milling, (4) rough rolling, (5) first annealing, (6) one-step cleaning, (7) intermediate rolling, (8) secondary annealing, (9) secondary cleaning, (10) intermediate finish rolling, (11) third annealing, (12) third cleaning, (13) finish rolling, (14) unwinding, (15) fourth annealing, (16) fourth cleaning, (17) refine rolling, (18) fifth cleaning, (19) flattening and (20) cutting and delivery. According to the technical scheme, the quality of small-size LED copper strips can be improved, the workshop cost is reduced, and the production profits are increased.

The invention discloses a manufacturing method for a silicon-containing stainless steel seamless tube. The method comprises the following procedures: heating of a tube blank; perforating; cold rolling; heat treatment; straightening; and pickling. In the procedure of heat treatment, a short-time high-temperature heat treatment process is employed, heat treatment temperature is 1090 to 1110 DEG C, a heat preservation coefficient is 0.8 to 1.5 min / mm, and heat preservation time is determined according to steel tube thickness and is calculated by multiplying the heat preservation coefficient with the steel tube thickness; and in the procedure of straightening, a forward-backward bidirectional straightening method is employed, backward straightening is carried out after original unidirectional straightening, so the effect of integral fragmentation of a surface oxide skin is realized. According to the invention, the short-time high-temperature heat treatment process is employed, so the surface oxide skin becomes thinner and loose after heat treatment, which facilitates easy removal of the oxide skin during pickling; the forward-backward bidirectional straightening method is employed for integral fragmentation of the surface oxide skin, so the oxide skin left in pickling is eliminated, a better fragmentation effect is exerted on the loose oxide skin, and product surface quality after pickling is further guaranteed.

The invention discloses a soft mold auxiliary forming method for a variable section I-beam containing a corrugated flange plate. According to the soft mold auxiliary forming method for the variable section I-beam containing the corrugated flange plate, the non-closed form that a metal mold and a silicon rubber mold are combined is adopted; the silicon rubber soft mold is wrapped inside the metal mold; corrugated flange plate side pressurizing (internal pressure) is conducted through heat expansion of the silicon rubber soft mold, the hot pressing tank (external pressure) forming process is combined, and internal and external two-way pressurizing is conducted, so that the pressure applied to a complex section is uniform and controllable, integral curing forming of the composite variable section I-beam containing the corrugated flange plate is well achieved, and the problem that a corrugated structure is not easy to pressurize is solved.

The invention provides a preparation method of ultrathin Ta-W alloy foil, and belongs to the technical field of Ta-W alloy machining. The preparation method includes the steps that cyclic operation of alloy billet prepared through a powder metallurgy method, cold rolling cogging, and cold rolling and vacuum annealing, 3-5 micrometer foil annealing, and the like. The thickness of the prepared foil can reach 3-5 micrometers. The preparation method is simple in process, the prepared foil is high in precision, and compared with pure Ta foil and other Ta-W alloy foil, the ultrathin Ta-W alloy foil has the advantages of being high in strength, good in surface quality, and the like. The prepared Ta-(5.0-7.5 wt%)W alloy foil with the thickness of 3-5 micrometers is suitable for high-power microwave tubes, traveling wave tubes, and other vacuum devices of electronic components, aerospace, and other industries. The preparation method has great significance on achieving high-power high-performance microwave tube localization, improving microwave tube using performance, prolonging service life, and the like.

The invention discloses a preparing method of a high-performance shock absorbing spring steel band for an automobile and belongs to the technical field of spring steel band preparation. The preparing method comprises the following steps: preparing raw materials, carrying out acid pickling, carrying out continuous rolling, adopting a bell type furnace to carry out first annealing, carrying out rolling and splitting, adopting the bell type furnace to carry out second annealing, examining finished products, carrying out oiled packaging and carrying out warehousing. The fluctuation of the thickness tolerance and the width tolerance of the spring steel band prepared by adopting the technical scheme is small, so that the spring steel band has stable performance. Besides, the strength, hardness and ductility of the spring steel band are effectively improved, so that the requirement of the automobile on a shock absorbing effect can be met. At the same time, the defects of a preparing technology of the spring steel band in the prior art are overcome.