Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1997-02-14
2000-10-24
Bryant, David P.
Metal working
Method of mechanical manufacture
Assembling or joining
2988802, 29511, B23P 1102
Patent
active
06134768&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for producing a connection between an insert element with a tube-like part by means of flanging.
Such a method is known, for example, from DE 40 13 032 A1. With this method the insert element is embodied as a lid, which is introduced from a front end of a tube-like part embodied as a housing. The lid comes to rest in the direction of the longitudinal axis of the housing against a detent in order to assure exact positioning in the direction of the longitudinal axis. Subsequently the edge of the housing which projects past the lid in the direction of the longitudinal axis is flanged radially inward in relation to the longitudinal axis of the housing, while being plastically deformed, so that it grips around the outer edge of the lid and rests against the lid in the direction of the longitudinal axis of the housing. The lid is then fixed in place between the detent and the flanged edge of the housing in the direction of the longitudinal axis. During flanging of the edge of the housing, the housing is pressed together in the direction of its longitudinal axis and after flanging springs back. The holding power of the flange is reduced and, under unfavorable circumstances can even become zero.
A method is furthermore known in which the maintenance of the holding power of the flange is assured. To this end the tube-like part has an area whose exterior diameter is enlarged in respect to the remaining area over at least a portion of its circumference at its one end, into which the insert element is to be introduced. To produce the flange, a ring-shaped tool element is pushed over the tube-like part from its other end, whose cross section is less than the area of the tube-like part of enlarged exterior cross section and is at least as large as the exterior cross section of the remainder of the tube-like part. A relative movement in the direction of the longitudinal axis takes place between the tool element and the tube-like part, so that the tool element is moved over the area of the tube-like part with the enlarged exterior cross section and this area is pushed radially inward in relation to the longitudinal axis while being plastically deformed. While the ring-shaped tool element is moved over the area of the tube-like part with an enlarged exterior cross section, a tensile force simultaneously acts on the tube-like part, so that the holding power on the insert element is even increased by the spring-back of the tube-like part following the production of the flange, and in this way an assured fastening of the insert element in the tube-like part is achieved.
The area which has an enlarged exterior cross section in relation to its remaining area, which is formed on the one end in which the pump element is inserted, requires several work steps for its production, for example by deep drawing.
SUMMARY OF THE INVENTION
In contrast to this, the method in accordance with the invention for producing a connection between an insert element with a tube-like part by means of flanging, has the advantage that an area of enlarged diameter is provided on the tube-like part which, during the flanging process, is elastically deformed by a tool element which receives the tube-like part, so that the free end of the tube-like part is stretched by this, because of which, following the flanging process, the spring-back of the elastic area of the tube-like part can be compensated, and the insert element is maintained in the tube-like part under at least partial tension, and secure fastening can be achieved.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1, an insert ele
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Bryant David P.
Robert & Bosch GmbH
Striker Michael J.
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