Character and causes of in-service needle failure in knitting machines

Krasovskii, A. Ya.; Kramarenko, I. V.; Gaidamaka, V. G.

doi:10.1007/bf01528942

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…In the paper [10], the types of the needles` failures are studied; the work [11] presents the ways to increase their useful lifetime. The purpose of the work aimed at determining the reasons for the needles` failures is primarily related to fractographic studies of fatigue fractures of the hooks [2] and the damage from wear [12]. Also, a set of organizational and technical measures to obtain complete and reliable information on a comprehensive study of the needles' failures is presented.…”

Section: Literature Reviewmentioning

confidence: 99%

“…According to the results of the study of needle failures in production, the domination of hook destructions has been identified. Using the fractography analysis of surfaces of hook failures, the fatigue nature of destructions has been recorded [1,2]. It is concluded that fatigue failures of needle hooks are the results of repeated action of repeated-variable loadings of the needle during the interaction with pitched cams that raise and lower the needles, and lateral cams, which braking needles on a given trajectory.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of Fatigue Longevity of Rod Elements of Complex Form

Berezin

Rubanka

et al. 2021

Period. Polytech. Mech. Eng.

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The questions of design maintenance of a given fatigue longevity of rods of complex form during the intensification of load modes without changing of geometric, inertial and rigidity parameters of roads are considered. The study is conducted on the example of needles of circular machines with a small diameter of cylinder (automatic half-hose machines). An approach, based on the system of calculation of loads, loadings and resources under the criterion of fatigue strength, is proposed. The key link for the transition from the results of dynamic analysis to the determination of reliability indices is the dependence of limited longevity of needles on the cycles of load to fatigue failure with the use of statistical data on operating time to fatigue failure of the needles in production conditions. Since the random values of loads of the needles do not obey the normal law of distribution, the general description of density of distribution of amplitude of loads is presented. The influence of increase in speed parameters and constructive measures, aimed to reduce the corresponding loads at a current size of critical section of the needles, on the fatigue longevity is analyzed.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Estimation of Fatigue Longevity of Rod Elements of Complex Form

Berezin

Rubanka

et al. 2021

Period. Polytech. Mech. Eng.

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“…Latch needle is inclined to fatigue fracture in the weaving process by the frequent impact of knitting cams and the tension of yarns. According to the literature survey: heel fracture --0.82%, hook fracture --60.27%, latch dislodgment--8.14%, hook straightening --18.5%, and others --11.22% [3]. It is obvious that the hook failure is the main form of latch needle failure.…”

Section: Structural Designmentioning

confidence: 99%

An Investigation of the Wear Resistance of Knitting Machinery Needle

Zeng

Song

et al. 2012

AMR

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Comparison tests of needles made in abroad and domestic on chemical composition, microstruture , mechanical property and so on, the main influence factors of the wear resistance were analysed. Approaches of improving the wear resistance of needles are given,such as hot process,surface treatment ,local strengthening. Combined with finite element analysis, the stress and the strain of the needle hook were analysed. Comparative results of both abroad and domestic show that the carbide in the microstructure and structural design of needles are regarded as the main influence factors of the wear resistance.

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Character and causes of in-service needle failure in knitting machines

Cited by 2 publications

References 2 publications

Estimation of Fatigue Longevity of Rod Elements of Complex Form

Estimation of Fatigue Longevity of Rod Elements of Complex Form

An Investigation of the Wear Resistance of Knitting Machinery Needle

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