Installing method of pressing bushing and structural part

An installation method and bushing technology, applied in the field of material processing, can solve the problems of unfavorable fatigue strength and uneven distribution of through holes, and achieve the effect of improving fatigue strengthening effect, uniform distribution and improving fatigue life.

Active Publication Date: 2020-12-15
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, this method will make the tangential residual stress on the edge of the through hole unevenly distributed along the radial direction of the through hole, and the residual compressive stress on the edge of the through hole on the extrusion surface of the mandrel is often small and residual tensile stress appears. The fatigue strength of the through hole is unfavorable

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  • Installing method of pressing bushing and structural part
  • Installing method of pressing bushing and structural part
  • Installing method of pressing bushing and structural part

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Embodiment Construction

[0045] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.

[0046] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification only for convenience, for example, according to the description in the accompanying drawings directions for the example described above. It will be appreciated that if the illustrated device is turned over so...

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Abstract

The invention relates to an installing method of a pressing bushing and a structural part. The installing method comprises the following steps of providing a workpiece with a through hole; embedding the pressing bushing in the through hole to form clearance fit between the pressing bushing and the through hole; placing an auxiliary bushing in the pressing bushing to form clearance fit between theauxiliary bushing and the pressing bushing, and forming a gap, which extends in the axial direction of the auxiliary bushing, in the wall of the auxiliary bushing; under the condition that magnitude of interference exists between the diameter of an reinforced rod and the internal diameter of the auxiliary bushing, extruding the auxiliary bushing by the reinforced rod so as to apply extruding forceto the pressing bushing by the auxiliary bushing to form interference fit between the pressing bushing and the through hole; and dismounting the reinforced rod and the auxiliary bushing. The pressingbushing is installed by using the installing method, so that the tangential residual stress of the wall of the through hole in the workpiece is uniformly distributed in the axial direction, and the tangential residual stress caused at the extruding end of the reinforced rod can be eliminated, which can improve the fatigue reinforcing effect of the hole and further prolong the fatigue life of thehole.

Description

technical field [0001] The present disclosure relates to the technical field of material processing, in particular to a method for installing a press-fit bushing and [0002] Structure. Background technique [0003] At present, in the technical field of material processing, in order to install the press-fit bushing in the through hole of the workpiece, it is generally adopted to directly squeeze the press-fit bush with a mandrel. However, this method will make the tangential residual stress on the edge of the through hole unevenly distributed along the radial direction of the through hole, and the residual compressive stress on the edge of the through hole on the extrusion surface of the mandrel is often small and residual tensile stress appears. The fatigue strength of the through hole is disadvantageous. [0004] It should be noted that the information disclosed in the above background section is only for enhancing the understanding of the background of the present discl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P19/02
CPCB23P19/02
Inventor 闫五柱
Owner NORTHWESTERN POLYTECHNICAL UNIV
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