4results about How to "Reduce surface hardness" patented technology

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 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.

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.