Dual-heating bending technology of large-diameter high-grade steel thick-walled elbow

A dual-heating, high-grade steel technology, applied in the field of pipe bending, can solve problems such as the inability to control the temperature difference between inside and outside, and achieve the effects of improving energy utilization, increasing stress, and fast heating speed

Pending Publication Date: 2019-05-10
HEBEI CANGHAI PIPE FITTINGS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the patent of the present invention adopts the internal and external double heating and simmering process, the defect that the internal and external temperature difference cannot be controlled cannot be overcome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A double-heating and simmering process for large-diameter high-grade steel-grade thick-walled elbows, the processing method of which includes:

[0021] (1) Preparation: The preparatory work includes cleaning the surface of the elbow, which uses a rotating brush to clean the inner and outer walls of the elbow to remove the dirt on the inner and outer surfaces of the elbow. After the preparatory work is completed, set the double heating device Activate the dual heating device inside and outside the elbow;

[0022] (2) Double heating: The external heating device of the intermediate frequency power supply electromagnetic induction heating coil is used to heat the bent pipe at a temperature of 930°C. The internal heating device is fixed on the inner wall of the steel pipe through the positioning wheel. During the bending process, the internal heating device is fixed. Without moving, the elbow slides forward with the positioning wheel, the advancing speed is 30mm / min, the nat...

Embodiment 2

[0027] A double-heating and simmering process for large-diameter high-grade steel-grade thick-walled elbows, the processing method of which includes:

[0028] (1) Preparation: The preparatory work includes cleaning the surface of the elbow, which uses a rotating brush to clean the inner and outer walls of the elbow to remove the dirt on the inner and outer surfaces of the elbow. After the preparatory work is completed, set the double heating device Activate the dual heating device inside and outside the elbow;

[0029] (2) Double heating: The external heating device of the electromagnetic induction heating coil of the intermediate frequency power supply is used to heat the bent pipe at a temperature of 950 ° C. The internal heating device is fixed on the inner wall of the steel pipe through the positioning wheel. During the pushing process of the curved pipe, the internal heating device is fixed. Without moving, the elbow slides forward with the positioning wheel, the propulsi...

Embodiment 3

[0034] A double-heating and simmering process for large-diameter high-grade steel-grade thick-walled elbows, the processing method of which includes:

[0035] (1) Preparation: The preparatory work includes cleaning the surface of the elbow, which uses a rotating brush to clean the inner and outer walls of the elbow to remove the dirt on the inner and outer surfaces of the elbow. After the preparatory work is completed, set the double heating device Activate the dual heating device inside and outside the elbow;

[0036] (2) Double heating: use the external heating device of the electromagnetic induction heating coil of the intermediate frequency power supply to heat the bent pipe at a temperature of 970°C. The inner heating device is fixed on the inner wall of the steel pipe through the positioning wheel. During the pushing process of the bent pipe, the inner heating device is fixed. The elbow does not move, the elbow slides forward with the positioning wheel, the propulsion sp...

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Abstract

The invention discloses a dual-heating bending technology of a large-diameter high-grade steel thick-walled elbow. The dual-heating bending technology comprises the processing processes of preparation, dual heating, temperature detection, intelligent temperature control and temperature-controlled cooling. According to the dual-heating bending technology, the interior and the exterior of the elboware heated at the same time through a dual-heating device, the energy utilization rate, elbow heating speed and pushing speed can be increased, quenching performance of the elbow can be improved, theinterior exterior temperature difference is intelligently controlled, and the situation that a steel tube is broken due to too high temperature difference can be prevented.

Description

technical field [0001] The invention relates to the field of pipe bending processing, in particular to a double-heating and simmering process for large-diameter, high-grade, thick-walled pipe bending. Background technique [0002] The main technical key to the manufacture of hot-simmered bent pipes is the bending of bent pipes. The traditional pipe bending method is: the pipe is heated by the medium-frequency electromagnetic induction heating ring to locally reach the required high temperature, and at the same time, the pipe is bent under the huge thrust and then cooled. The heat utilization rate of the traditional single-channel heating device is low, only 20%, and most of the heat is consumed and wasted. The heating speed of the large-diameter thick-walled elbow is slow, and the bending speed is too slow, which has a great impact on the production efficiency of the elbow. Large impact, resulting in a lot of energy waste, and the bend performance is not ideal. However, du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D7/16B21C51/00
Inventor 王鹏飞赵德清王保元孙文达齐永明张川赵红玉刘文广孙凤珍张春环
Owner HEBEI CANGHAI PIPE FITTINGS GROUP
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