7results about How to "Avoid Surface Quality Issues" patented technology

The invention provides a method for eliminating delta ferrite in austenitic stainless steel and the austenitic stainless steel, and belongs to the technical field of metal materials. The method comprises the following steps that an austenitic stainless steel ingot containing the delta ferrite is subjected to heat preservation for first set time at the first set temperature for first heat treatment; heating the austenitic stainless steel ingot subjected to the first heat treatment to a second set temperature, and carrying out heat preservation for a second set time at the second set temperature for second heat treatment; and cooling the austenitic stainless steel ingot subjected to the second heat treatment, or sequentially and repeatedly carrying out the first heat treatment and the second heat treatment on the austenitic stainless steel ingot subjected to the second heat treatment for at least one time, and then cooling to obtain the austenitic stainless steel subjected to delta ferrite elimination. The first heat treatment and the second heat treatment are performed, and the second set time is limited, so that the austenitic stainless steel is prevented from being in a high-temperature environment for a long time, and austenite grains are prevented from obviously growing.

The application discloses a kind of process method and fixture of processing wedge type locking block, method includes S1 preparation plate material;S2 blanking to plate material;S3 heat treatment plate material as blank;S4 numerical milling processing 1: numerical milling blank, drilling forms light hole and thread bottom hole, thread bottom hole tapping processing;S5 numerical milling processing 2: cutting blank;S6 surface passivation treatment;S7 to final inspection;For the fixture for processing wedge type locking block includes clamping seat, pressing plate, first locking screw and second locking screw, clamping seat is provided with clamping through slot, first threaded hole and mounting hole, pressing plate is provided with second threaded hole;By improving process method, multiple process contents are combined, clamping frequency is reduced, semi-finishing requirement in process is increased, no burr can be generated in process, because clamping frequency is reduced, part surface quality is improved;Raw material utilization is higher, is half of all materials of original process scheme, total amount of waste gas emission is reduced by half compared with original process scheme.

The invention relates to the technical field of steel wire rods, and discloses a corrosion-resistant low-carbon steel wire rod with deformation performance and a preparation process thereof.The corrosion-resistant low-carbon steel wire rod comprises 0.04%-0.15% of C, 0.7%-0.9% of Mn, 0.05%-0.14% of Si, 0.015%-0.02% of P, 0.02%-0.07% of S, 0.02%-0.03% of Cr, 0.02%-0.03% of Ni, 0.008%-0.025% of Al, 0.03%-0.04% of Si, 0.056%-0.068% of Cu, 0.0024%-0.0038% of S0, 0.25%-0.30% of Mn, 0.015%-0.025% of Als, 0.007%-0.009% of Ce, 0.004%-0.006% of La and the balance Fe and inevitable impurities. By means of the process, the steel wire rods are stably produced in batches, the steel wire with the excellent surface quality and the zinc coating is obtained, the steel wire rod is suitable for being erected in coastal areas and areas with industrial pollution or heavy salt mist, not prone to corrosion and long in service life, the production raw materials are researched and improved, the steel wire rods are improved fundamentally, and the production cost is reduced. The use efficiency of the steel wire rod is greatly improved, and the deformation performance and the corrosion resistance of the steel wire rod are improved.

The invention relates to a powder particle surface micro-shaping method and a powder particle surface micro-shaping device. The powder particle surface micro-shaping method comprises the following steps: grinding powder particles in a grinding system by adopting a grinding medium under a preset temperature condition; gas is conveyed into the grinding system; the gas can stir powder particles and drive the powder particles to be in contact with the grinding medium; and when the mass of the powder particles meets the preset mass requirement, the powder particles are driven out of the grinding system by the gas. The technical problem to be solved is how to provide the powder particle surface micro-shaping method, corners of powder particles in irregular shapes are trimmed, polished and rounded, the powder particles are processed into powder particles with uniform sizes and regular shapes, and the flowability of slurry prepared from powder is improved.

The invention discloses a continuous casting process for reducing surface rolling cracks generated by hot charging of a 20CrMo steel continuous casting billet, which comprises the following steps of: passing 20CrMo molten steel meeting requirements through a crystallizer to obtain the continuous casting billet, and cooling the obtained continuous casting billet by stages to convert a metallographic structure on the surface layer of the continuous casting billet from austenite into bainite and martensite, and a grain boundary AlN phase is controlled to be separated out, then the treated continuous casting billet is fed into a heating furnace to be subjected to follow-up treatment, and the 20CrMo steel continuous casting billet is obtained. The continuous casting process has the beneficial effects that the separation amount of AlN on the surface layer of the continuous casting billet can be effectively reduced through the partition surface rapid cooling process after the continuous casting billet is discharged out of the crystallizer, the appearance of grain boundary film ferrite is avoided, and the purpose of reducing hot charging surface rolling cracks is achieved. The process is easy to implement, and the rapid production rhythm can be guaranteed.

The invention relates to the technical field of mobile phone frame production rolling, and discloses a mobile phone frame production rolling device which comprises a rack, a conveying mechanism is arranged on the front side of the rack, a rolling mechanism is arranged in the rack, and the rolling mechanism comprises an upper roller and a lower roller. Cleaning mechanisms are arranged on the sides, close to a discharging port of the rolling mechanism, of the upper roller and the lower roller correspondingly, the cleaning mechanisms are installed in the rack, a collecting mechanism is arranged on the inner wall of the rack, a correcting mechanism is arranged at a feeding port of the rolling mechanism, and a straightening mechanism is arranged at a discharging port of the rolling mechanism; the cleaning mechanism comprises a scraping plate, and two fixing shells are fixedly connected to the inner wall of the rack. And under the action of the first spring, the scraping plate is always in close contact with the surface of the roller, and residues on the surface of the roller can be effectively scraped off in real time. And it is ensured that the surfaces of the rollers can be always kept in a relatively clean state in the rolling process.

This utility model relates to the field of quenching technology for high-elasticity spring production, specifically a rapid quenching device for stainless steel bars used in high-elasticity spring production. The device includes a base column and a worktable. An induction control box is fixedly connected to the upper surface of the worktable. Three induction copper tubes, all arc-shaped, are provided on one side of the control box. A clamping device is provided on the upper surface of the worktable, comprising a sliding groove. The groove is formed on the upper surface of the worktable, and a first screw is rotatably connected to the inner wall of the groove. A slider is slidably connected to the inner wall of the groove, and the slider is threadedly connected to the first screw. This utility model solves the problem that existing quenching equipment requires manual clamping of the bars using special tools, which easily leads to burns to operators during quenching and significantly increases labor costs due to prolonged clamping.