Low molding pressure load fastening system and method

A fastening and low-mode technology, applied to rivets and other directions, can solve the problems of time-consuming and high cost, expensive and difficult realization of quenching and tempering, and achieve the goal of reducing molded load, eliminating complexity, and high-strength capabilities Effect

Active Publication Date: 2011-06-22
胡克国际公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This further increases the cost and complexity of manufacturing the fastener
For example, two such heat treatment methods include: stress relief annealing and quenching and tempering; achieving consistent desired hardness by stress relief annealing is difficult to achieve and quenching and tempering is expensive without undesirable penetration of the collar surface. Difficult to achieve in the case of carbon or decarbonization
Both methods are time consuming and costly, e.g. additional charges for furnace operating costs are required

Method used

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  • Low molding pressure load fastening system and method
  • Low molding pressure load fastening system and method
  • Low molding pressure load fastening system and method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0076] The purpose of the first experiment was to determine whether a collar manufactured to size HS5CF-R12 could be used as a headed collar to meet the Grade 8 value. HS5CF-R12 fasteners are manufactured by Huck International, Inc. of Waco, Texas, USA. Commercially available Grade 5 molded type fasteners were manufactured.

[0077] The experiments involved testing the outside diameter (OD), hardness, swage load, tensile strength and preload of standard quenched and tempered Grade 8 collars and comparing them to Grade 5 collars such as cold heading collars. The results are expressed quantitatively in Table 1 below.

[0078] Table 1: Grade 5 Collars as Headed Collars

[0079]

[0080]

[0081] As shown in Table 1, the two collars "A" and "B" have 18% lower molded loads than the current standard HS8CF-R12 collar, and both meet the Grade 5 minimum industry tensile strength and preload requirements. Experiments have revealed that the collar, such as the cold heading col...

example 2

[0086] The second experiment arose out of a desire to develop an economical way to improve the life of safety tools and to reduce the cost of manufacturing Grade 8 collars. Specifically, the goal of the experiment was to determine whether a thinner walled, as-headed collar could increase snub load, reduce swage load and maintain the same tensile strength as a standard quenched and tempered collar and preload. The detent load is the load at which the collar 14 initially engages the pin lock slots 26, 26a, 26b, 26c, 26d. After this moment, plate (eg, workpieces 18, 20; 18a, 20a; 18b, 20b; 18c, 20c) clearance pullout is restricted because the collar 14 is seized on the pins 12, 12a, 12b, 12c, 12d. If the gap is maintained after the snub, the clamping force is reduced because instead of stretching the pins 12, 12a, 12b, 12c, 12d, the collar elongates to make the gap disappear.

[0087] HSCF-R20 made from the same processing sequence and raw material (50KSI tensile strength) were...

example 3

[0104] In addition to the results of the first two experiments, the third experiment also tested the effect of increasing the stiffness of the collar while reducing the wall thickness of the collar in an attempt to find the best balance of high strength and low mold load. Gap pullout results in less than optimal clamping force at the joint. However, as demonstrated in Example 2, increasing the collar stiffness also increased the mold force of the mounting collar. Reducing the collar wall thickness disproportionately lowers the mold force more than the stop (gap pull-out) load. Correspondingly, combining the findings of the preceding experiments, the installation is improved by balancing the increase in collar stiffness with a decrease in collar wall thickness to maintain the same tensile strength and preload, and increasing the stop load while reducing the molded load. Tool life, this experiment is expected to overcome known fastener design limitations. The purpose of this e...

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Abstract

A low swage load fastening system is provided for installing swage-type fasteners to fix a plurality of workpieces together. The fastener includes a pin member having an elongated pin shank. An enlarged head at one end of the pin engages one side of the workpieces. A grooved pin portion extends past an opposite side of the workpieces. A collar includes a shank portion adapted to be swaged into the pin lock grooves in response to a relative axial swage load applied by an installation tool. One aspect of the system, the collar is as-headed and does not require thermal processing yet provides anoptimum balance of reduced collar shank wall thickness and increased hardness, whereby the swage load is minimized. A low wage load thread form for the lock grooves of the pin is also provided, a reduced diameter, relatively short pull portion pin extension, installation tool improvements, and an associated method of use are also disclosed. The collet has a protrusion from said collet thereby extending the length of the pull section in a direction towards the collar thereby to increase the contact area with said anvil. The end of the pull section is not pressed on the diameter position in line with the groove bottom so as to improve the shear strength of the end pull tooth crest of the pull section. The last pull tooth crest of the pull section has a profile matching with the expansion stretcher radius of the last tooth of the collet.

Description

technical field [0001] The present invention relates to fasteners, and more particularly, to fastening systems including multi-piece, molded type fasteners and their molding tools, the fastening system of which exhibits the optimum of low molding loads and high strength balance. The invention also relates to a simplified installation method using a low swage load fastening system. Background technique [0002] In many commercial applications, two-piece threaded or molded fasteners, commonly referred to as lock bolts, are commonly used to secure multiple workpieces together. See, eg, US Patent Nos. 2,531,048; No. 3,215,024; No. 3,915,053; No. 4,472,096; and No. 5,090,852. Depending on the commercial application in which the fasteners will be used, the material properties of these fasteners, such as tensile strength and hardness ((not limited to the Grade)) vary. In order to distinguish the various properties of fasteners, fasteners are typically indicated by a grade (Grade...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16B19/08B21J15/00
CPCB21J15/28F16B19/05B21J15/022
Inventor 拉里・D・默瑟罗伯特・J・克贝特
Owner 胡克国际公司
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