8results about How to "Reduce surface hardness" patented technology

The invention discloses a waterborne epoxy resin coating, a preparation method and application in bridge protection, and belongs to the technical field of coatings. The water-borne epoxy resin coating comprises the following raw material components in parts by weight: 15-25 parts of epoxy composite resin emulsion, 100 parts of emulsified asphalt, 3-5 parts of a curing agent and 6-10 parts of water, wherein the epoxy composite resin emulsion is obtained by carrying out a composite reaction on 30-60 parts by mass of epoxy resin, 2-3 parts by mass of an emulsifier, 6-9 parts by mass of an acrylate composition and 1.4-1.6 parts by mass of a co-stabilizer; the acrylate composition is prepared by prepolymerizing 15 to 16 parts by mass of butyl methacrylate, 10 to 12 parts by mass of 2-isopropenyl aniline, 5 to 7 parts by mass of allyl glycidyl ether and 1 to 1.2 parts by mass of allyl polyhedral oligomeric silsesquioxane and then combining the prepolymerized materials with 1 to 3 parts by mass of acrylic acid.

The application relates to the technical field of 40Mn2 steel processing, in particular to a method for reducing the surface hardness of 40Mn2 steel. The method comprises the following steps: establishing a cycle correction period according to the parameters of a round steel to be processed; generating a plurality of feedback time nodes according to the cycle correction period, and obtaining a processing evaluation value of a previous cycle correction period according to the feedback time nodes; generating a correction instruction according to the processing evaluation value, and correcting the processing parameters in a next cycle correction period according to the correction instruction. The processing process of the 40Mn2 round steel is dynamically corrected by establishing the cycle correction period, the surface hardness of the 40Mn2 round steel is reduced by reducing the finish rolling temperature, the center hardness and the surface hardness of the processed 40Mn2 round steel are more uniform, so that subsequent sawing is facilitated, and thermal wear is reduced. The surface hardness of the 40Mn2 round steel is reduced by prolonging the pit entry cooling duration, so that the center hardness and the surface hardness of the processed 40Mn2 round steel are more uniform.

The invention relates to the technical field of phase change materials, in particular to a composite phase change material and a preparation method thereof.According to the composite phase change material, a polyhydric alcohol phase change agent with a long carbon chain side chain is synthesized through a click reaction of polyhydric alcohol containing double bonds and long carbon chain mercaptan; a polyhydric alcohol structure in a molecular chain of the phase change agent promotes molecular chain crystallization and phase change latent heat improvement, the phase change agent, polyethylene glycol and amorphous polyhydric alcohol jointly form a polyhydric alcohol system, the polyhydric alcohol system reacts with isocyanate to synthesize a phase change polyurethane elastomer, paraffin with high phase change latent heat is doped, the phase transition temperature of a material can be effectively reduced, and the phase change performance of the material is improved. The tensile strength and the elongation at break are obviously improved, and the surface hardness is obviously reduced, so that the composite phase change material with high phase change latent heat, good mechanical property and low surface hardness is obtained, and the composite phase change material can be better applied as a thermal management interface material.

A decorative material including a substrate and a decorative sheet laminated on at least one side of the substrate is provided. The decorative sheet includes a colored substrate layer; and a transparent resin layer laminated on one side of the colored substrate layer, where the transparent resin layer is made of a resin composition containing plant-derived high-density polyethylene, and a nucleating agent is added to the resin composition containing the high-density polyethylene.

The invention discloses a heat treatment method for reducing quenching and tempering state surface hardness of 15CrMoR, and belongs to the technical field of metallurgy. The heat treatment method comprises quenching and tempering heat treatment. In the quenching process, the heating temperature ranges from 830 DEG C to 840 DEG C, the total heating time ranges from 2.0 min / mm to 2.5 min / mm, and water cooling is conducted to the room temperature after discharging; and in the tempering process, the heating temperature is 720-730 DEG C, the heat preservation coefficient is 3-3.5 min / mm, and air cooling is conducted after discharging. The structure of the tempered steel plate is a two-phase structure of ferrite and tempered martensite. The produced steel plate has good obdurability matching, the surface hardness is smaller than or equal to 220 HB, and the crack defect in the machining process of rolling, welding and the like is avoided.

The invention belongs to the technical field of heat treatment processes, and particularly relates to a production method of a high-toughness SA387Gr11CL2 steel plate, which comprises a steel billet heating process, a steel billet rolling process, a water cooling process and a tempering process, and solves the problems that in the production process of the existing SA387Gr11CL2 steel plate, the hardness and the impact strength cannot be coordinated, and the capacity of a quenching furnace cannot be released. The heat treatment capacity is released, the production cost is reduced, the hardness and the impact strength of the steel plate are optimal, and the production quality of the SA387Gr11CL2 steel plate is greatly improved.

This disclosure provides a shrink label and a packaging container. The shrink label includes a shrink film layer, a varnish layer with a soft touch, and an graphic information layer. The varnish layer is disposed on the surface of the shrink film layer. The graphic information layer is disposed on the inner layer of the shrink film layer. The packaging container includes a bottle and the shrink label. This shrink label helps to reduce the surface hardness of the shrink label and improves the feel of the shrink label.

This invention discloses a method and a special fixture for improving the tool life of hard turning of dial-type parts. Step 1: Before heat treatment: A frustum is milled on the mating surface of the dial-type part and its mating component, with the axis of the unmachined threaded hole as the center. The diameter of the frustum is ΦD. Step 2: Anti-seepage treatment: Before entering the furnace for heat treatment, an anti-nitriding coating is applied to the end face and periphery of the frustum to reduce surface hardness. Step 3: Heat treatment: The dial-type part is nitrided. Step 4: Hard turning: Using a CNC lathe and a hydraulic chuck, and with special jaws to clamp the dial-type part, the threaded hole of the dial-type part is hard turned, and the frustum is hard turned. This invention reduces the intermittent cutting area on the hard-turned end face after nitriding, thus improving tool life. The special jaws used to clamp the dial reduce vibration caused by intermittent cutting, further improving the tool life of hard turning.