Dieless automatic pipe bending machine with continuously adjustable bending radius and pipe bending method

Abstract

The invention provides a die-less automatic pipe-bending machine capable of continuously adjusting bending radius, which is used for machining pipes. The die-less automatic pipe-bending machine comprises a pipe-bending machine body, a spindle, an inner chuck slide rail, and an outer chuck slide rail used in cooperation with the inner chuck slide rail, the inner chuck slide rail and the outer chuck slide rail are fixedly arranged on the pipe-bending machine body, the spindle comprises an upper rotary shaft and a lower rotary shaft movably arranged on the bottom of the upper rotary shaft, the upper rotary shaft of the spindle is connected to an inner press roller through a retractable rod, the lower rotary shaft of the spindle is connected to an outer press roller through a telescopic mechanism, and the inner press roller is connected to the outer press roller through an inner roller and outer roller coupling mechanism. The invention further provides a pipe-bending method implemented by the die-less automatic pipe-bending machine: a pipe is put between the inner press roller and the outer press roller, the pipe is fixed jointly by an inner chuck, an outer chuck and a mandrel, the pipe is then bent by the revolution of the outer press roller, and the pipe is then bent jointly by the revolution and rotation of the inner press roller and the revolution of the outer press roller.

Description

technical field [0001] The invention relates to a pipe bending system, in particular to a moldless automatic pipe bending machine with continuously adjustable bending radius and a pipe bending method. Background technique [0002] According to the forming method, the pipe bending machine is mainly divided into molded bending, rolling bending and moldless bending. The traditional moldless bending is mainly used for large-diameter, thick-walled and high-strength steel pipes, which requires local heating treatment, low efficiency, and comparative limitations. High, the bending method in molded bending has high forming efficiency and simple process flow. The disadvantage is that one mold can only bend one bend radius. When pipes with the same diameter want to achieve different bend radii, it is necessary to change the mold frequently. The mold cannot meet the requirements of pipes with the same pipe diameter and different bend radii, the mold manufacturing cost is high, and the ...

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Problems solved by technology

[0002] According to the forming method, the pipe bending machine is mainly divided into molded bending, rolling bending and moldless bending. The traditional moldless bending is mainly used for large-diameter, thick-walled and high-strength steel pipes, which requires local heating treatment, low efficiency, and comparative limitations. High, the bending method in molded bending has high forming efficiency and simple process flow. The disadvantage is that one mold can only bend one bend radius. When pipes with the same diameter want to achieve different bend radii, it is necessary to change the mold frequently. The mold cannot meet the requirements of pipes with the same diameter and different bend radii, the cost of mold manufacturing is high, and the replacement of molds reduces production efficiency

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