A review of some of the principles involved in chuck design

Thornley, R. H.; Wilson, Bill

doi:10.1049/tpe.1972.0010

Cited by 7 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The main factors limiting the rotational speed of power chucks are the strength failure of chuck parts and the insufficient gripping force owing to the centrifugal force of chuck jaws. According to the results of high-speed destructive experiments for wedge power chucks, the strength dependent speed limit is much higher than the gripping force dependent speed limit [9,10]. Therefore, the insufficient gripping force becomes the key factor limiting the rotational speed of high-speed power chucks.…”

Section: Introductionmentioning

confidence: 99%

“…Under the effect of gripping forces and centrifugal forces, workpieces, chuck transmission parts and jaw junctions come to deform, causing the gripping force loss to be lower than the centrifugal force of chuck jaws [10,[12][13][14]. Pahlitzsch [12] proposed a model of the gripping force loss for three jaw scroll chucks considering the stiffness of chuck transmission, top jaw and workpieces.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Piecewise model and experiment of power chuck’s gripping force loss during high speed turning

Zhou

Yang

et al. 2011

Sci. China Technol. Sci.

View full text Add to dashboard Cite

High speed power chucks are important function units in high speed turning. The gripping force loss is the primary factor limiting the rotational speed of high-speed power chucks. This paper proposes a piecewise model considering the difference of wedge transmission's radial deformation between low-speed stage and medium-to-high-speed stage, the friction forces of chuck transmission, and the compressibility of hydraulic oil in rotary hydraulic cylinders. A corrected model of gripping force loss is also established for power chucks with asymmetric stiffness. The model is verified by experiment results. It is helpful to use the piecewise model to explain the experimental phenomenon that the overall loss coefficient of gripping force increases with the rotational speed increasing at medium and high speed stages. Besides, the loss coefficients of gripping force at each stage during speeding up and the critical rotational speed between two adjacent stages are discussed. For wedge power chucks with small wedge angel (α<20°) and ordinary lubrication (μ 0 >0.06), the local loss coefficient of gripping force at the low speed stage is about 70% of that at the medium to high speed stage. For wedge power chucks with larger wedge angel (α>20°) or low friction coefficient (μ 0 <0.06), the wedge transmissions cannot self-lock at high speed stage, and the gripping force loss at the high speed stage is related to the hydraulic lock and hydraulic oil in the rotary hydraulic cylinder; the local loss coefficients of gripping force at the third stage is about 1.75 to 2.13 times that at the second stage. This work is helpful to understand the mechanism of the gripping force loss thoroughly and to optimize power chucks. high speed turning, power chuck, gripping force loss, rotary hydraulic cylinder, model, experiment Citation: Zhou C, Yang H Y, Yang L K, et al. Piecewise model and experiment of power chuck's gripping force loss during high speed turning. Sci China Tech Sci, 2011, 54: 972−982,

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Piecewise model and experiment of power chuck’s gripping force loss during high speed turning

Zhou

Yang

et al. 2011

Sci. China Technol. Sci.

View full text Add to dashboard Cite

show abstract

“…限制楔式动力卡盘转速提高的主要因素是高速离心力导致的动力卡盘强度失效和夹紧力不足 . 楔式动力卡盘的高速破坏性试验表明, 卡盘体和传动机构强度失效时的最高转速远高于夹紧力不足时的最高转速 [9,10] , 因此, 夹紧力不足是制约动力卡盘转速提高的最关键因素. 动力卡盘的动态夹紧力决定于初始静态夹紧力和夹紧力损失.…”

unclassified