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Metallic pipe bending apparatus, and method for manufacturing a metallic pipe having a bent portion

A technology for bending processing and metal pipes, which is applied in the field of bending processing, can solve problems such as increasing compression force, and achieve the effect of reducing the amount of wall thickness reduction

Inactive Publication Date: 2012-12-19
DAI ICHI HIGH FREQUENCY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the compression force is to be increased, the output power of the compression driver will increase and the size of the mechanism supporting it will increase, which in turn will lead to an increase in the overall size of the bending machine. Therefore, the current situation is that only increasing the compression force is difficult. meet the above requirements

Method used

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  • Metallic pipe bending apparatus, and method for manufacturing a metallic pipe having a bent portion
  • Metallic pipe bending apparatus, and method for manufacturing a metallic pipe having a bent portion
  • Metallic pipe bending apparatus, and method for manufacturing a metallic pipe having a bent portion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Figure 3A with Figure 3B It is a figure which shows the bending processing apparatus concerning the 1st Example of this invention. As shown in these figures, this bending machine includes: a heating coil 11 for heating a metal pipe 1 to be processed; a power supply unit 12 for supplying a high-frequency current to the heating coil; arm 21; the base 51 that holds the rear portion of the metal pipe 1 and advances toward the heating coil 11; the propulsion driving part 31 that advances the base 51; the compression driving part 41 that applies a compressive force to the metal pipe 1; and is fixed on the fulcrum A and The pedestal 10 that supports the base 51 so that it can advance toward the support axis A. As shown in FIG.

[0050] The gripping arm 21 includes a front gripping portion 22 that grips the current front position of the heating portion of the metal pipe 1 by the heating coil 11 , and is provided so as to be rotatable about the pivot A. In this example, the...

Embodiment 2

[0056] Figure 4 It is a figure which shows the bending processing apparatus of the 2nd Example of this invention. As shown in this figure, this bending machine is the same as the above-mentioned first embodiment, and includes a heating coil 11 for heating the metal pipe 1, a power supply unit 12, a clamping arm 21, a base 51, a propulsion drive unit 31 (a propulsion cylinder 32 and piston rod 33), compression driving part 41 (compression cylinder 43, piston rod 44 and rack 45), guide ring (pinion) 42, support shaft A and pedestal 10, but unlike the above-mentioned first embodiment, push The cylinder 32 of the driving part 31 is fixed on the base 51, and the front end of the piston rod 33 of the propulsion driving part 31 is fixed on the support shaft A, and the base 51 is brought close to the base 51 by pulling the piston rod 33 into the propulsion cylinder 32. The fulcrum A advances.

[0057] In addition, with respect to the propulsion direction of the metal pipe 1, the su...

Embodiment 3

[0059] Figure 5 It is a figure which shows the bending processing apparatus concerning the 3rd Example of this invention. As shown in the figure, this bending machine is the same as the above-mentioned first embodiment, and includes a heating coil 11, a power supply unit 12, a clamp arm 21, a base 51, a propulsion drive unit 31 (a propulsion cylinder 32 and a piston rod 33), The compression driver 41 (compression cylinder 43, piston rod 44, and rack 45), the guide ring (pinion) 42, the support shaft A, and the base 10 are different from the above-mentioned first embodiment in that the heating coil 11 is used. When the heating part of the metal pipe 1 (or the gripping point of the metal pipe 1 by the clamp arm 21 in the initial state (at the beginning of processing)) is used as a reference, the compression driving part 41 is arranged on the same side as the support axis A.

[0060] The compression drive unit 41 has the compression cylinder 43 and the piston rod 44 provided wi...

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PUM

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Abstract

A metal pipe bending apparatus comprises heating means for fully circumferentially heating a portion of a metal pipe which is an object for a bending process, propulsion means for propulsively driving the metal pipe toward the heating means in an axial direction of pipe, guiding means including a cramp arm for cramping the metal pipe and configured for pivotal movement about a pivot shaft, for cramping a point in front of a region of the metal pipe heated by the heating means with the cramp arm, revolving the cramp point about the pivot shaft in association with the metal pipe propulsively driven by the propulsion means, and thereby applying a bending moment to the metal pipe, and compression means for causing a compression force to act on the metal pipe by applying a draw-back force to the metal pipe through the cramp arm with the pivot shaft serving as a fulcrum, where the draw-back force includes a force in a direction opposite to a direction in which the metal pipe is propulsively driven by the propulsion means. The compression means is disposed such that a distance from a point at which the draw-back force is applied to the pivot shaft is larger than a distance from a point at which the metal pipe is cramped by the cramp arm to the pivot shaft. The amount of reduced thickness can be further restrained without requiring an increase in compression driving force in a metal pipe bending process.

Description

technical field [0001] The present invention relates to a metal pipe bending device and a method of manufacturing a metal pipe having a bend portion, and more particularly to a technique for performing bending while preventing a decrease in the thickness of the metal pipe. Background technique [0002] Metal pipes are currently widely used as conduits for conveying fluids such as oil, gas, and various liquids in industrial facilities such as plants, factories, and power plants, or as structural materials for civil engineering structures such as bridges and stadium roofs. These metal pipes are standardized and pre-formed into a predetermined shape (straight pipe or special-shaped pipe (elbow pipe, elbow head, etc.) Hereinafter, it is called an elbow), because this elbow can flexibly respond to the requirements of various curvatures and pipeline shapes. [0003] On the other hand, in the case of manufacturing a bent pipe, if the straight pipe as a raw material is simply bent,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D7/16
CPCB21D7/025B21D7/162
Inventor 岸原重树吉留隆裕萱野帆高西本友三
Owner DAI ICHI HIGH FREQUENCY