Heat molding and water cooling mold of uniform-section boron steel pipes

Abstract

The invention relates to a heat molding and water cooling mold of uniform-section boron steel pipes. The heat molding and water cooling mold comprises an upper mold base and a lower mold base, wherein an upper mold forming insert is mounted on the lower surface of the upper mold base; a lower mold forming insert is mounted on the upper surface of the lower mold base; the lower surface of the upper mold forming insert and the upper surface of the lower mold forming insert are molding surfaces of boron steel pipe workpieces; the heat molding and water cooling mold is characterized in that sealing heads are respectively arranged at two ends of the boron steel pipe workpieces; the front ends of the sealing heads extend into pipe ends of the boron steel pipe workpieces and are in close contact with the pipe ends of the boron steel pipe workpieces; the rear ends of the sealing heads are connected with an axial hydraulic cylinder or a gas cylinder; water cooling channels are arranged at the centers of the sealing heads; the front ends of the water cooling channels are communicated with the interiors of the boron steel pipe workpieces; the rear ends of the water cooling channels are connected with a water cooling system; the diameter of the front ends of the sealing heads is smaller than that of the rear ends of the sealing heads. The heat molding and water cooling mold is capable of producing parts with material mechanical strength of 1500MPa under the condition that the products are designed to be uniform in section.

Description

technical field [0001] The invention relates to a thermoforming and water-cooling mold 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 0.25 0.35 1.30...

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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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