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High-locking anti-crack mandrel and closing-in method thereof

A technology of anti-crack and threaded mandrel, which is applied in the direction of locking fasteners, threaded fasteners, connecting components, etc. It can solve the dimensional changes of the closing die due to thermal expansion and contraction, the influence of heat on the material of the nut, the influence of the surface of the nut on heat, etc. problem, to achieve the effect of easy disassembly and large locking torque

Pending Publication Date: 2021-11-02
AEROSPACE PRECISION PROD INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heating has brought about a series of problems such as heating method, heating transfer, temperature control, nut material affected by heat, nut surface affected by heat, size change of closing mold thermal expansion and contraction, heating working life of closing mold, heat protection, etc.

Method used

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  • High-locking anti-crack mandrel and closing-in method thereof
  • High-locking anti-crack mandrel and closing-in method thereof
  • High-locking anti-crack mandrel and closing-in method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Figure 4 The solid line in the middle is a schematic diagram of a mandrel for fixing a solid structure of the present invention. The mandrel has a special external thread, and the profile of the special external thread is obtained after modification on the basis of the external thread of the bolt corresponding to the internal thread of the nut. The profile angle, pitch diameter, minor diameter and pitch of the special external thread are equal to the profile angle, pitch diameter, minor diameter and pitch of the bolt external thread corresponding to the nut internal thread. The major diameter of the special external thread is smaller than the major diameter of the corresponding bolt external thread of the nut internal thread, approximately equal to the middle diameter of the corresponding bolt external thread of the nut internal thread. Figure 4 The dotted line in the middle shows the difference between the external thread of the mandrel of the present invention and ...

Embodiment 2

[0048] Figure 8 It is a schematic diagram of the pull-out state of the mandrel inner core of an expandable split structure of the present invention, Figure 9 It is a schematic diagram of an expandable and contractible split-structure mandrel inner core plugging state of the present invention. In this embodiment, the number of petals of the multi-lobed shell of the threaded mandrel is three. Using the mandrel to close the nut is divided into three steps: step 1, penetrate into the nut Figure 8 As shown in the mandrel, the mandrel penetration position should include the position on the nut to be closed, and then insert the inner core into the mandrel so that the mandrel becomes Figure 9 state shown, or let the mandrel become Figure 9 After the mandrel is screwed into the nut; step 2, use the closing mold to close the nut, and the closing position should correspond to the middle position of the threaded mandrel multi-lobed shell 5 of the mandrel, but not the corresponding ...

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Abstract

The invention provides a high-locking anti-crack mandrel and a closing-in method thereof. The method comprises the following steps that S1, the mandrel penetrates into a nut, and the penetrating-in position of the mandrel should contain the position, needing to be closed in, of the nut; and S2, the nut is subjected to closing-in through a closing-in die, an internal thread of the closing-in portion of the nut is extruded by the closing-in die and the mandrel, and the form of thread teeth of the internal thread is controlled to change. According to the high-locking anti-crack mandrel and the closing-in method thereof, operation can be conducted at the normal temperature, high locking torque can be generated, and cracks can be prevented.

Description

technical field [0001] The invention belongs to the technical field of fastener manufacturing, and in particular relates to a high-locking and anti-crack mandrel and a closing method thereof. Background technique [0002] The all-metal self-locking nut is a nut with its own anti-loosening effect, and its application range and application volume are huge. There are many types of locking structures for nuts, which can be divided into mechanically fixed locking structures and friction-increasing locking structures according to their working principles. Among them, the locking structures that increase friction can be divided into effective locking structures according to the locking principle. Torque type locking structure and free rotation type locking structure. The effective torque refers to the rotational torque measured when the threaded connection pair is not under the condition of axial load, when the nut is rotated smoothly. This torque has the locking function of resi...

Claims

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Application Information

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IPC IPC(8): F16B39/28F16B37/00
CPCF16B39/28F16B37/00
Inventor 郭双双魏亮亮刘玉生齐增星单垄垄
Owner AEROSPACE PRECISION PROD INC LTD
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