Production device of heat molding and water cooling process of uniform-section boron steel pipes

Abstract

The invention relates to a production device of a heat molding and water cooling process of uniform-section boron steel pipes. The production device is characterized by comprising a pressure machine, wherein a heat molding mold is mounted in the pressure machine; sealing heads are arranged at two ends of the heat molding mold; the front ends of the sealing heads are in contact with uniform-section boron steel pipe workpieces; the rear ends of the sealing heads are connected with an axial hydraulic system; cold water channels are arranged in the centers of the sealing heads; the front ends of the cold water channels are communicated with the interiors of the boron steel pipe workpieces; the rear ends of the cold water channels are connected with an axial water cooling system; the axial water cooling system comprises a water cooler and a water storage tank; the water inlet end of the water cooler is connected with the water storage tank; the water outlet end of the water cooler is connected with one end of each cold water channel of each sealing head; the other end of each cold water channel is connected with a water discharging pipeline; a pressure regulation valve and a temperature measuring instrument are respectively arranged on the water inlet pipeline and the water outlet pipeline. The production device of the heat molding and water cooling process of the uniform-section boron steel pipes is capable of producing workpieces with material mechanical strength of 1500MPa and invariable section shape and perimeter.

Description

technical field [0001] The invention relates to a thermoforming and water-cooling process production equipment for equal-section boron steel pipes, and belongs to the technical field of heat treatment plastic forming and heat treatment. Background technique [0002] As a series of hot-formed steel pipes, the production process of boron steel pipes is divided into two stages: forming and quenching and cooling. Among them: the forming stage needs to be stamped and formed by a mold at high temperature; The transformation from tensite microstructure to martensite microstructure results in extremely high strength and hardness; depending on the type of boron steel, its strength can reach 500-2000MPa. The chemical composition of common boron steels whose strength reaches 1500MPa after hot forming is shown in Table 1. [0003] Table 1 [0004] C Si mn P S Cr B min 0.20 0.20 1.00 - - 0.15 0.0015 max ...

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Problems solved by technology

However, the disadvantage of this method is that the middle part of the workpiece, especially the front end of the head, cannot form a tight fit with the mold, so the cooling efficiency in this area is low, and the martensite structure is often unable to form, which becomes a "depression" of product strength

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