1998 Vol.11(1)
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1998, 12(1).
Abstract:
A method of designing guided chain drive machanism with linkage basing on the given motion track is expounded. The method consists of two steps that are synthesizing four-bar linkage approximately first and then deducing guide track, removing crank and jointing free end with chain. An example of synthesis that can realize the given motion track precisely is provided.
A method of designing guided chain drive machanism with linkage basing on the given motion track is expounded. The method consists of two steps that are synthesizing four-bar linkage approximately first and then deducing guide track, removing crank and jointing free end with chain. An example of synthesis that can realize the given motion track precisely is provided.
1998, 12(1).
Abstract:
Stresses and deformation states of pipe bending are investigated under loading or unloading with various pipe materials, size, bending radius and deformation temperature. A theorem of springback of large diameter pipe bending is presented. The experiments are carried out with pipe materials of 20, 10CrMo910 and 12CrMoV steel. Results of computations are in good agreement with experiments.
Stresses and deformation states of pipe bending are investigated under loading or unloading with various pipe materials, size, bending radius and deformation temperature. A theorem of springback of large diameter pipe bending is presented. The experiments are carried out with pipe materials of 20, 10CrMo910 and 12CrMoV steel. Results of computations are in good agreement with experiments.
1998, 12(1).
Abstract:
The solidification processing of SiCp/ZL108 composite material developed by mechanical stirring molten matrix alloy containing flux-treated SiC particles is studied. The criterion and model of particles well-distributed in matrix are discussed. The bonding structure of interface between SiC particles and ZL108 matrix and the morphology of tensile fracture are analysed by using JXA-840A electron-probe. The mechanism of crack propagating is explored preliminarily.
The solidification processing of SiCp/ZL108 composite material developed by mechanical stirring molten matrix alloy containing flux-treated SiC particles is studied. The criterion and model of particles well-distributed in matrix are discussed. The bonding structure of interface between SiC particles and ZL108 matrix and the morphology of tensile fracture are analysed by using JXA-840A electron-probe. The mechanism of crack propagating is explored preliminarily.
1998, 12(1).
Abstract:
I nm roughness value of sillicon surface by diamond turning is obtained firstly and three novel techniques are proposed. The surface integrity is studied in detail by using atomic force microscope, scanning electron microscope, and stylus surface instrument. The diamond tool sharpness has a considerable influence on the machined surface, therefore a novel technique-brightness modulation for measuring accurately the edge of the cutter is proposed. Mirror surfaces are assessed by another novel technique-a mearately the edge of the cutter is proposed. Mirror surfaces are assessed by another novel technique- a measure of their reflectivity. A third technuque, single grit diamond machining is carried out. It supplies an experimental evidence for verifying the obtained high quality turned surfaces.
I nm roughness value of sillicon surface by diamond turning is obtained firstly and three novel techniques are proposed. The surface integrity is studied in detail by using atomic force microscope, scanning electron microscope, and stylus surface instrument. The diamond tool sharpness has a considerable influence on the machined surface, therefore a novel technique-brightness modulation for measuring accurately the edge of the cutter is proposed. Mirror surfaces are assessed by another novel technique-a mearately the edge of the cutter is proposed. Mirror surfaces are assessed by another novel technique- a measure of their reflectivity. A third technuque, single grit diamond machining is carried out. It supplies an experimental evidence for verifying the obtained high quality turned surfaces.
1998, 12(1).
Abstract:
The boundary element method in framework is given to evaluate three dimensional frictional contact problems. Elasto-plastic material behavior is taken into account by mean of an initial stress formulation and Von Mises yield criterion. The amount of tangential traction at contact surface is limited by Coulomb's friction law and constant shear rule. From some numerical results of a plate rolling problem, it is demonstrated her that the BEM can be used to efficiently and accurately analyze this class of forming problems.
The boundary element method in framework is given to evaluate three dimensional frictional contact problems. Elasto-plastic material behavior is taken into account by mean of an initial stress formulation and Von Mises yield criterion. The amount of tangential traction at contact surface is limited by Coulomb's friction law and constant shear rule. From some numerical results of a plate rolling problem, it is demonstrated her that the BEM can be used to efficiently and accurately analyze this class of forming problems.
1998, 12(1).
Abstract:
The necessary condition of pure folling for the rollers moving along its individual came are obtained by the analysis of the loading status of the rollers and it provides a theoretical basis for adjustment of the rollers and it provides a theoretical basis for adjustment of folling stand.
The necessary condition of pure folling for the rollers moving along its individual came are obtained by the analysis of the loading status of the rollers and it provides a theoretical basis for adjustment of the rollers and it provides a theoretical basis for adjustment of folling stand.
1998, 12(1).
Abstract:
Experiments on consolidating process and mechanism of internal loose structures in heavy ingots are studied by taking stretching technology as example. Considering various detecting indexes, the equivalent relationships of forging ratios which are required by different forging processes with parameters are gotten. Effective experimental methods and basis can be provided for the studying the of forging geavy ingots.
Experiments on consolidating process and mechanism of internal loose structures in heavy ingots are studied by taking stretching technology as example. Considering various detecting indexes, the equivalent relationships of forging ratios which are required by different forging processes with parameters are gotten. Effective experimental methods and basis can be provided for the studying the of forging geavy ingots.
1998, 12(1).
Abstract:
The lubrication basis theory os worm pair is given. The lubrication state of worm gear is analyzed. It is found that the temperature distribution on the tooth surface of worm gear is closely related with the lubrication state and that the temperature on the tooth surface of worm gear is consistent with the characteristic term of mesh and motion of worm pair.
The lubrication basis theory os worm pair is given. The lubrication state of worm gear is analyzed. It is found that the temperature distribution on the tooth surface of worm gear is closely related with the lubrication state and that the temperature on the tooth surface of worm gear is consistent with the characteristic term of mesh and motion of worm pair.
1998, 12(1).
Abstract:
By the numberical calculation of dynamic lining pressure distributions, temperature fields and thermal stress fields of steel plates, a method using nonlinear fimite element techniques to analyze failure mechanism of a multiple disc wet brake is detailed, and some measures for combatting these failures are provided.
By the numberical calculation of dynamic lining pressure distributions, temperature fields and thermal stress fields of steel plates, a method using nonlinear fimite element techniques to analyze failure mechanism of a multiple disc wet brake is detailed, and some measures for combatting these failures are provided.
1998, 12(1).
Abstract:
Several main steps of internal combustion engine block structure dynamic design, such as model set-up, structure dynamic response analysis, optimizing design and vibration and noise control, are discussed for the type of EQ6100 gasoline engine block.
Several main steps of internal combustion engine block structure dynamic design, such as model set-up, structure dynamic response analysis, optimizing design and vibration and noise control, are discussed for the type of EQ6100 gasoline engine block.
1998, 12(1).
Abstract:
The rice compound seedling raising machine is developed according to the request for the rice project-seeding plant technology. The principle of the transmissin system of the rice compound seedling raising machine and the seed-feeding wheel working parameters are introduced. The tests of different structure and working parameters are made in the testing device of the new rice compound seedling raising machine, and the optimizing parameters for designing of seed-feeding wheel are obtained.
The rice compound seedling raising machine is developed according to the request for the rice project-seeding plant technology. The principle of the transmissin system of the rice compound seedling raising machine and the seed-feeding wheel working parameters are introduced. The tests of different structure and working parameters are made in the testing device of the new rice compound seedling raising machine, and the optimizing parameters for designing of seed-feeding wheel are obtained.
1998, 12(1).
Abstract:
A CAD approach which can optimize and automate the parting direction determination is presented. The approach is based on the geometrical and topological information of a two-plate mould which minimizes the number of side cores. The shell of a part is divided into inter-inter-influential regions and non-influential faces in the mould design point of view. Through analyzing and computing the accessibility direction cones of the inter-influential regions, the optimal parting directions can be determined autonatically.
A CAD approach which can optimize and automate the parting direction determination is presented. The approach is based on the geometrical and topological information of a two-plate mould which minimizes the number of side cores. The shell of a part is divided into inter-inter-influential regions and non-influential faces in the mould design point of view. Through analyzing and computing the accessibility direction cones of the inter-influential regions, the optimal parting directions can be determined autonatically.
1998, 12(1).
Abstract:
Some mechanical and thermal propertise of FeMnSiCrNi shape memory alloys are studied. The results show that Fe-14Mn-6Si-9Cr-5Ni alloy among the alloys studied has the best SME with an absolute recovery strain of 6.2% when training method is used. The preexisting ε martensite (thermal and stressinduced) is beneficial to the shape memory effect. Up to a critical prestrain with a critical training time, the absolute recovery strain increases. Any further increase of prestrain or training time leads to the appearance of α' phase identified by superelasticity measurement. Alloys with good SME also have good creep and stress relaxation resistance, and hence possible industrial application for couplings.
Some mechanical and thermal propertise of FeMnSiCrNi shape memory alloys are studied. The results show that Fe-14Mn-6Si-9Cr-5Ni alloy among the alloys studied has the best SME with an absolute recovery strain of 6.2% when training method is used. The preexisting ε martensite (thermal and stressinduced) is beneficial to the shape memory effect. Up to a critical prestrain with a critical training time, the absolute recovery strain increases. Any further increase of prestrain or training time leads to the appearance of α' phase identified by superelasticity measurement. Alloys with good SME also have good creep and stress relaxation resistance, and hence possible industrial application for couplings.
1998, 12(1).
Abstract:
Nonlinear control methods are presented based on theory of sliding mode control (SMC) or variable structure control (VSC) for application to active automobile suspensions. Requirements of reducing manufacturing cost and energy consumption of the active suspension system may be satisfied by reasonable design of the sliding surface and hydraulic servo system. Emphasis is placed on the study of the discrete sliding mode control method (DSMC) applicable for a new sort of speed on-off solenoid valves of antidust capability and low price. Robustness and effectiveness of the feedback linearized controller in typical road conditions are demonstrated by numerical results for a quarter-car suspension model.
Nonlinear control methods are presented based on theory of sliding mode control (SMC) or variable structure control (VSC) for application to active automobile suspensions. Requirements of reducing manufacturing cost and energy consumption of the active suspension system may be satisfied by reasonable design of the sliding surface and hydraulic servo system. Emphasis is placed on the study of the discrete sliding mode control method (DSMC) applicable for a new sort of speed on-off solenoid valves of antidust capability and low price. Robustness and effectiveness of the feedback linearized controller in typical road conditions are demonstrated by numerical results for a quarter-car suspension model.
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