Gripping Force Model and Influence Factors of Gripping Device for Heavy Forging Manipulators

The paper introduces the shrinkage center conception and simplified model of the material solidification. Starting with a micro unit, the paper builds the force model, and derives the formula of the stress-strain principles on the basis of the force balance function, relationship between the strain and displacement and the unit boundary conditions. The theoretic analysis reveals the influence factors and the quantitative expression affecting parts deformation. At last, two special cases, separating layers and complete adhesive layers, are discussed to display the stress-strain distribution under such conditions.

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Research on Prediction Model of Conical Pick Cutting Force Based on Coulomb-Mohr Criterion

MATEC Web of Conferences ◽

10.1051/matecconf/202031904001 ◽

2020 ◽

Vol 319 ◽

pp. 04001

Author(s):

S.J. Wang ◽

X.M. Zong ◽

B. He ◽

K.X. Kang

Keyword(s):

Cutting Force ◽

Influence Factors ◽

Calculation Model ◽

Orthogonal Test ◽

Force Model ◽

Cutting Force Model ◽

Cutting Depth ◽

Conical Pick ◽

Engineering Data ◽

Result Show

Cutting force is one of the most important influence factors that affect the efficiency and service life of the conical pick. In order to accurately calculate the cutting force, through theoretical analysis and experimental research, a cutting force model consisted of the basic fracture parameters of rock, geometric parameters and installation parameters of pick is proposed based on the coulomb-mohr criterion, and the calculation model is corrected by whole cutting experimental data, and validated the corrected model by orthogonal test, the result show that the error of the cutting force model is about 10%, which meets the requirements of engineering data. At the same time, significant analysis on the cutting force is obtained by range method, cutting depth h > semi-tip angle β > cutting angle α.

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Surface Grinding Force Model of Steel 55 Based on Undeformed Chip Thickness with CBN Electroplated Wheels

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.189-193.1768 ◽

2011 ◽

Vol 189-193 ◽

pp. 1768-1773 ◽

Cited By ~ 3

Author(s):

Jun Ming Wang ◽

Ren Zhen Ye ◽

Hui Peng Chen ◽

Hong Zan Bin

Keyword(s):

Velocity Ratio ◽

Influence Factors ◽

Chip Thickness ◽

Grinding Force ◽

Calculation Model ◽

Surface Grinding ◽

Force Model ◽

Undeformed Chip Thickness ◽

Abrasive Grains ◽

Random Direction

Undeformed chip thickness is one of the most important parameters in grinding process, which is related to the entire abrasive grains in grinding simultaneously and changed periodically with time. Simplifying the geometric shape of abrasive grains ,the paper modifies the mathematic models of undeformed chip thickness by analytic method, establishes an universal calculation model of grinding force based on undeformed chip thickness, then optimizes the parameters of the model by restrictive random direction method according to the measuring experiments of the inter-grain spacing about CBN electroplated wheels and the grinding experiments of steel 55 during surface grinding, analyses the influence factors of the friction ratio on the grinding force. The results show that under the same grinding depth， both of the ratio and the grinding force will be decreased with the increase of velocity ratio VS/VW, but the ratio increases and the grinding force decreases with the increase of inter-grain spacing.

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Simulation and Experimental Study on Rotor System Dynamic Analysis with the Blade-Coating Rubbing Faults

Shock and Vibration ◽

10.1155/2021/2442760 ◽

2021 ◽

Vol 2021 ◽

pp. 1-15

Author(s):

Xin Lu ◽

Jie Tang ◽

Liwen Wang

Keyword(s):

Dynamic Characteristics ◽

Influence Factors ◽

Rotor System ◽

System Dynamic ◽

Force Model ◽

Power Performance ◽

Abradable Coating ◽

Increased Risk ◽

Blade Tip ◽

Blade Coating

In the modern turbo-machinery, reducing the clearance between the blade tip and casing inner face is an effective method to improve the power performance, but the clearance reduction leads to increased risk of blade-casing rubbing. In this paper, a blade-coating rubbing force model which considered the abradable coating scraping is developed to simulate the rotor system dynamic characteristics at blade-casing rubbing faults with abradable coating. An experimental tester is established to simulate the rotor system blade-casing rubbing faults; the AlSi-ployphenyl ester abradable coating is prepared and introduced into the blade-casing experiment to verify the model. After the vibration and force analysis in simulation and experiment, the dynamic characteristics and the influence factors of blade-casing rubbing rotor system are studied.

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