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Method and installation for making a workpiece comprising at least a tubular section

A technology for one part and workpiece, applied in the field of manufacturing workpieces and equipment including at least one tubular part, which can solve the problems that the tubular part cannot be manufactured conveniently

Inactive Publication Date: 2005-11-09
伊菲合金公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thin metal sheets can be bent in different ways, especially by hand, but hand bending is not compatible with high-speed industrial production
In addition, the known method of bending by means of a machine comprising a guard plate sometimes called a "support strip" and a hinged bending hinge plate against which the thin metal sheet to be bent is fixed to the fender with a clip

Method used

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  • Method and installation for making a workpiece comprising at least a tubular section
  • Method and installation for making a workpiece comprising at least a tubular section
  • Method and installation for making a workpiece comprising at least a tubular section

Examples

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Embodiment Construction

[0049] FIG. 1 schematically shows a shadow mask 1 mounted on a shadow mask support frame 2 . The support frame is generally rectangular in shape and comprises two lateral uprights 3, 3' and two end uprights 4, 4'. The shadow mask is made of a thin metal foil, such as an iron-nickel alloy foil with a low coefficient of expansion, the shadow mask is pierced with many small holes 5 and fixed by welding to the upper edges 6, 6 of the end uprights 4, 4' 'superior. There may be shadow masks of different shapes depending on the cathode ray tube associated with them. In the example shown, the shadow mask is substantially planar, but it could equally well be curved as part of a cylinder. Furthermore, the shadow mask 1 can be tensioned, ie subjected to a tension parallel to the side uprights 3, 3' of the support frame 2.

[0050] The uprights 3, 3', 4 and 4' are formed by bending a sheet metal so that each upright constitutes a tubular member. These four uprights can be obtained by ...

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PUM

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Abstract

The invention concerns a method which consists in pre-bending a metal plate along at least two longitudinal edges (12-13) then in bending said plate along at least one edge (12-13) using a bending member (103-104) by exerting, during the bending process (F1, F3), a clamping force (F7, F8) of part (23, 24) of the plate relative to the bending member (103, 104). Said clamping force (F7, F8) can be globally oriented towards the edge (12, 13). The installation comprises at least a member for bending (103-104) the metal plate along a longitudinal edge (12-13) of a tubular section of the frame. The bending member (103-104) is equipped with means (103f-104f) for exerting on a part (23, 24) of the plate a clamping force (F7, F8) countering the sliding of part (23, 24) of the plate along the bending member (103, 104). The bending member is articulated about a virtual geometrical axis (a, c) located inside the corresponding tubular section of the component to be produced.

Description

technical field [0001] The invention relates to a method and a device for manufacturing a workpiece comprising at least one tubular portion obtained by bending a thin metal sheet. The method and the device are particularly suitable for the manufacture of a shadow mask support frame for a cathode ray picture tube. Background technique [0002] Such frames are used, for example, in the field of manufacturing color television sets. A color picture cathode ray tube consists of a metal foil pierced with many holes or slits, called a "shadow mask" and placed between the electron gun and the display screen. The shadow mask is supported by a frame, generally rectangular in shape, which fixes the shadow mask in position near the display screen and, if necessary, ensures that the shadow mask is taut in order to limit the localized area generated by the electron beam. Deformation caused by overheating. [0003] From EP-A-0809272 it is known to produce a shadow mask frame from two th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D5/04B21D53/00H01J9/14H01J29/07
CPCH01J9/142H01J29/073B21D5/04H01J2229/0722
Inventor 让-克洛德·让多
Owner 伊菲合金公司