Metal pipe, and method and device for processing the same
a technology of metal pipes and metal pipes, applied in the field of metal pipes, can solve the problems of unnecessarily increasing the weight of metal pipes, affecting and the likely breakage of metal pipes, so as to reduce energy consumption, reduce the deformation resistance, and increase the production efficiency and dimensional accuracy of metal pipes.
Inactive Publication Date: 2013-10-17
HIROTEC CORP
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The invention relates to a method for producing a metal pipe with a thick portion. The method involves forming a stress concentration portion in the axial center of the metal pipe, deforming the stress concentration portion through the use of inner and outer dies, and using the deformed stress concentration portion as the starting point for the thick portion. This allows for a metal pipe that is lightweight and has the required strength in a required portion to be obtained with high precision at low cost. The invention also includes forming a shoulder in the metal pipe to make it easier and less expensive to obtain. Additionally, the method prevents damage or deformation to the inner peripheral surface of the metal pipe during the thickening process.
Problems solved by technology
Thus, the metal pipe, particularly the junction, is likely to break.
This unnecessarily increases weight of the metal pipe.
Method used
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[0040]An embodiment of the present invention will be described in detail below with reference to the drawings. The embodiment will be set forth merely for the purposes of preferred examples in nature, and is not intended to limit the scope, applications, and use of the invention.
[0041]FIG. 1 shows a metal pipe 1 of an embodiment of the present invention fixed to a flange component 2. The metal pipe 1 constitutes a pipe of an exhaust manifold, which is part of an exhaust system of an internal combustion system mounted in an automobile (not shown).
[0042]In the description of the present embodiment, an upstream part of the metal pipe 1 in a direction of an exhaust stream will be simply referred to as an “upstream part”, and a downstream part of the metal pipe 1 in the direction of the exhaust stream will be simply referred to as a “downstream part” for the sake of easy description.
[0043]As shown in FIG. 2, the upstream part of the metal pipe 1 is inserted in a through hole 2a formed in...
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Abstract
A method for processing a metal pipe 1 to make part of the metal pipe 1 in an axial direction thereof into a thick portion 10, the method includes: forming a shoulder as a stress concentration portion in an axial center of the metal pipe 1 to concentrate a stress thereon; setting the metal pipe 1 in an outer die 20; and forming the thick portion 10 by inserting an inner die 25 in the metal pipe 1 to provide space S for forming the thick portion 10 between the inner and outer dies 25 and 20, and applying the axial pressure to the metal pipe 1 to concentrate the stress on the shoulder to deform the shoulder after the forming and the setting, thereby forming the thick portion 10 from the deformed stress concentration portion as a starting point.
Description
TECHNICAL FIELD[0001]The present invention relates to metal pipes, part of which is made thicker than the other part, and a method and a device for processing the metal pipes.BACKGROUND ART[0002]For example, metal pipes have been used in part of exhaust systems of internal combustion engines mounted in automobiles. The metal pipe repeatedly receives heat of exhaust gas, and stress is concentrated on a junction between the metal pipe and the other component due to vibrations of the internal combustion engine and a vehicle body. Thus, the metal pipe, particularly the junction, is likely to break. To prevent the break, the metal pipe may be thickened, or may be made of a material having higher strength.[0003]When the pipe is thickened, part of the pipe on which the stress is not concentrated, i.e., part of the pipe which is less likely to break, is also thickened. This unnecessarily increases weight of the metal pipe. Even when the material is changed, the weight of the metal pipe hard...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B21D9/00
CPCB21D9/00B21K21/12B21J5/08
Inventor KOBAYASHI, NAOYUKITORIOKA, NOBUO
Owner HIROTEC CORP