Process for quenching die-cutting rule band steel for printing

Abstract

The invention belongs to printing industry, and in particular relates to a process for quenching die-cutting rule band steel for printing. The quenching process comprises the following step: preserving the heat of band steel for a certain period of time at a quenching heating temperature in a lead bath band steel quenching furnace by taking water as a main decarburizing medium and an taking ammonia-decomposed gas as a heating medium, wherein the total flow rate of the ammonia-decomposed gas is 3 to 5 times (m<3>/h) that of the interval volume of a muffle pipe and is introduced into the muffle pipe of the lead bath band steel quenching furnace after being divided into paths through a main flow meter, wherein one path directly enters the muffle pipe through a mixing pipe by means of a branch flow meter and the other one enters the muffle pipe through the mixing pipe after being mixed with water steam in a humidifier; and the temperature preserving time is 3 to 4 times that of t, wherein t=a*k*D=1*1.8*D (a is a heating coefficient with a unit of minute/millimeter; k is a band steel charging coefficient and D is an effective band steel thickness with a unit of millimeter). The defect of poor bending performance in heat treatment band steel used by a die-cutting rule product for printing is overcome and the bending requirement of the die-cutting rule product for printing can be met.

Description

technical field [0001] The invention belongs to the printing industry, and in particular relates to a quenching process for strip steel of a die cutter for printing. Background technique [0002] In the post-press processing stage of the printing and packaging industry, there is a post-press die-cutting process. The product required for it is a die-cutting knife for printing (called a steel wire knife in China). The die-cutting knife is made of heat-treated belts of different hardness. The steel is processed by a special process to produce sharp edges of different angles and shapes, and the plate-making workers arrange die-cutting plates of different shapes to die-cut or press-cut printing paper to obtain products of the required shape. It is a special forming die-cutting for the printing industry. knives. [0003] The strip steel heat treatment process for processing die cutters is different from the traditional heat treatment process. The printing industry requires die cu...

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Problems solved by technology

[0005] In order to solve the defects in the above-mentioned prior art, the inventor, after many years of exploration and testing, summed up a set of mature strip steel surface controllable thickness surface decarburization heat treatment process, used in the strip steel heat treatment production line, successfully solved the problem In the past, the disadvantages of poor bending and forming of domestic die-cutter products

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