Flexible bend pipe core mould

A bending and flexible technology, which is applied in the field of CNC bending molds, can solve the problems that the relative bending radius is not small enough and the structure of the bending mand

Inactive Publication Date: 2009-02-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects that the existing mandrel for bending pipes is not compact enough in structure and the relative bending radius is not small enough, the present invention proposes a flexible mandrel for bending pipes

Method used

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  • Flexible bend pipe core mould
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  • Flexible bend pipe core mould

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment is a flexible mandrel for numerical control bending design of a large-diameter thin-walled tube with a diameter of 127mm, a wall thickness of 1.25mm, and a bending radius R of 190.5mm, and its relative bending radius is 1.5D.

[0032] According to the pipe size and bending specifications, it is determined that the outer diameter of the core head body and the core head cover are both 124.02mm, and the number of socket ball joints is 3. This embodiment includes a core head body, a coupling shaft, three socket ball joints, three core head covers and three elastic snap rings.

[0033] The socket and ball joint is an axisymmetric shape. One end of the two socket joints is an inner circular ball socket, and the other end is a sphere. The ball socket is a large semicircle, and its inner diameter is slightly larger than the outer diameter of the ball; on the outer wall of the ball socket mouth, there are positioning steps along the circumference, and there is a...

Embodiment 2

[0046] This embodiment is a flexible mandrel for numerically controlled bending design of a large-diameter thin-walled tube with a diameter of 50mm, a wall thickness of 1mm and a bending radius R of 75mm, and its relative bending radius is 1.5D.

[0047] According to the pipe size and bending specifications, it is determined that the outer diameter of the core head body and the core head cover are both 47.5mm, and the number of socket ball joints is 2. The specific mold design method and assembly method are the same as in Example 1. During the bending process, the flexible core head can be smoothly bent to a bending radius of 1.5 times the pipe diameter, thus ensuring the bending forming with a small bending radius.

[0048] The two socket joints are axisymmetric shapes. One end of one of the socket joints is an inner circular ball socket, and the other end is a sphere. The ball socket is a large semicircle, and its inner diameter is slightly larger than the outer diameter of...

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Abstract

The invention relates to a flexible syphon core mould, which comprises a core head body (6), a connecting shaft (5), ball joints (3), a positioning key (11), a core head sleeve (2) and an elastic clamp ring (1) which are in mechanical connection. The ball joints (3) are arranged in the core head sleeve (2) as core heads; a plurality of ball joints (3) are linked through the nested cooperation between balls and ball sockets and are axially positioned by the clamp ring (1) and the positioning key (11); and the outside diameter of each point on the surface of an outer circle of the core head sleeve (2) is equal to the diameter of the core head body (6) in order that each point of the outer surface of the core head sleeve (2) can be matched with the inner wall of a tube (4). In use, the core head sleeve (2) can freely rotate around the ball joints by the movable ball joint so as to meet the requirement for the bending and forming curvature of tubing. The flexible siphon core mould can smoothly bend a large-calibre thin-wall tube with the smallest relative bending radius of 1.0 decimeter, can control the ellipticity of the formed tubing within 5 percent and has the characteristics of compact structure, easy replacement of main wearing parts and strong universality.

Description

1. Technical field [0001] The invention relates to a numerically controlled pipe bending mold, in particular to a flexible pipe bending mandrel. 2. Background technology [0002] At present, there are many kinds of known bent pipe mandrels, such as cylindrical mandrels, cylindrical round head mandrels, chain mandrels and flexible shaft mandrels. The structure is formed by connecting the core head body, the core head and the linking device. When forming the pipe bend, select the appropriate mandrel according to the pipe diameter, wall thickness, bending radius and other parameters. However, the forming of large-diameter thin-walled tubes such as stainless steel, aluminum alloy, and titanium alloy with small bending radius (wall thickness less than 1 mm, wall thickness factor greater than 50, and relative bending radius less than 1.5) has higher requirements on the mandrel. The mandrel structure used is not compact and flexible due to the design limitations of the core head ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D9/03
Inventor 杨合申世军詹梅李恒
Owner NORTHWESTERN POLYTECHNICAL UNIV
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