Method for preparing large-diameter seamless tubular product by squeezing equipment

Abstract

The invention provides a method for preparing a large-diameter seamless tubular product by squeezing equipment, which is used for scale production of large-diameter special alloy tubes. The method comprises the following steps: firstly, pre-processing a blank on a blank producing machine; performing turning on the outer circumference, the end face and the inner hole wall of the blank by machine tool equipment; heating the blank in a heating furnace or an electric furnace; squeezing to form a tubular billet on a large-scale squeezing machine; and finally, processing the tubular billet. The method comprises the following operation steps: a, pre-heating the squeezed blank; b, upsetting the blank; c, punching the blank; d, machining the squeezed blank; e, heating the squeezed blank; f, carrying out a squeezing process; g, cutting off an excess pressure part and taking out the squeezed tubular billet; and h, post-processing the tubular billet. According to the method provided by the invention, the large-scale squeezing equipment and the process steps with high operability are utilized, so that not only can the quality of the large-diameter seamless tubular product be ensured, but also large-diameter tubular products can be produced in scale.

Description

technical field [0001] The invention relates to a method for manufacturing seamless steel pipes, in particular to a method for batch-manufacturing large-diameter seamless pipes by using extrusion molding equipment, and belongs to the technical field of steel pipe processing. Background technique [0002] The pipes involved in the present invention include special alloy pipes and composite pipes, wherein special alloy pipes mainly refer to seamless pipes of stainless steel, nickel-based alloys, titanium alloys, and magnesium alloys. Compared with general carbon steel and alloy structural steel pipes, they have High temperature resistance, corrosion resistance, good deformation resistance, narrow forging temperature range and other characteristics; the composite pipe is a multi-layer metal pipe, the outer layer of the base pipe bears stress, and the inner layer alloy pipe is made of corrosion-resistant materials, so the composite pipe has excellent resistance Impact performanc...

AI Technical Summary

Problems solved by technology

In the prior art, special alloy pipes with small and medium diameters are generally formed by extrusion and forging processes, while pipes with large diameters above φ355.6mm are usually manufactured by coil welding. The performance cannot be exactly the same as that of the parent body, which will have an adverse effect on the fatigue strength and service life of the pipe; in the prior art, the composite pipe is directly covered with a corrosion-resistant alloy layer on the inner wall of the matrix pipe or through the method of expanding the diameter of the lining pipe and reducing the diameter of the matrix pipe Manufacturing, due to the limitations of process technology and equipment conditions, it is difficult to achieve mass production of composite pipes by using the above manufacturing methods

Images