The Development in Finish Machining of Hardened Gear

This article summeried the methtods in finish machining of hardened gear and mainly introduced the development of the form grinding technique in grinding wheel dressing and grinding technology. The technique, which makes use of CBN tools, of hardened gear finish machining is also briefed.     

Intensity Comparative Analysis Based on Ideas Between Involute Gear and Double Involute Gear

Modeler and simulation modules in Ideas software are used to build the finite element models on involute gear and double involute gear with accurate tooth shape, and with the same design parameters and under the same loads, finite element contact analysis has been done. At last, the contact stress and bending stress on the two types gear transmission at the different meshing positions are solved out, and comparative analysis and study have been done. At the same time, that the ladder-shape tooth on the double involute gear how to influence contact stress and bending stress is emphatically analysed. All above offer the theoretical foundation that bring the double involute gear with ladder-shape tooth into the industry.     

Optimum Compound Profile Modification of Cyclodal Gear

The analysis of the existing way and amount of profile modification of cycloidal gears at present showed that the equidistance and movedistance modification is in substance really to have the profile swelled up,and the rational modification way and amount is a swelling correction within the range of zero to some limit. This paper presents a new modifying way which is optimum compound modification at separate parts. The modified profile has the most simultaneously transmission teeth,even side clearance and the longest wear-life to forming crush dressing roll and is also easyly to NC machining.     

Study on Dynamical Characteristic of Epicyclic Gear Drive with Internal Tooth

The epicyclic gear drive with internal tooth is analysed,a dynamic analysis model which is based on the compatibility conditions of deformation is set up.On the basis of this model,the analysis of dynamics and kinematics is made,and the influence of design parameters on dynamical characteristic is also studied.     

Dynamic Optimization of System Parameters For the Epicyclic Gear Drive with Internal Tooth

The epicyclic gear drive with internal tooth has been analysed,the formula has been also deduced for computing the inertial force and change of contact force,and the dynamic optimization of system parameters for the force of bearing has been carried,it has given a reliable proof to reduce the dynamic load and prolong the life of bearing of three ring type reducer.     

Experimental Study of Hobbing Spray-welding Gear

After self-dissolvable nickel-base alloy spray-welded on the surface of scrapped gear of which 40CrNi is base metal is obtained. Using non-coating lengthen hob,moving the hob in axial,aligning the hob and adopting suitable cutting conditions,the better methods of hopbbing spray-welding gear profile are found out.     

Transmission model of higher-order elliptical bevel gearing and motion simulation for interference checking

Higher-order elliptical bevel gear is a typical form of the noncircular bevel gear transmission.Space spherical coordinate system of the bevel gear meshing is set up based on the meshing theory of space transmission.The varying relationship among the pitch curve,tooth profile and mesh lines are analyzed,and the equation of the gear tooth surface is developed with matrix method based on space coordinate transformation.The basic parameters of the noncircular bevel gear such as transmission ratio,modulus and the number of teeth are designed,and detailed analysis of the influence of the eccentricity on the relevant parameters is carried out as well.By using discrete numerical method and three-dimensional software,the mathematical model of the tooth profile and virtual physical model of the noncircular bevel gear are established,and then simulation on its motion and interference checking are performed.Finally,the approach for design,calculation and generation of the tooth profile is obtained and its correction has been verified by experiment.     

Accurate mathematical models for relief grinding of gear hob cutters

A mathematical model for accurate relief grinding of gear hob cutters along radial directions is presented based on the analysis of grinding geometry. Both the design and manufacturing models of gear hob cutters are carefully derived and presented. By employing the plane envelope theory, the reference contour of the grinding wheel is determined in order to attain the design tool profile precisely. The tooth profile error model after regrinding is also given to confirm the grinding parameters. The model provides accurate solutions for both the tool profile and the sectional contour of the grinding wheel. It is simple and straightforward and can be used to produce high precision hob cutters systematically. Two numerical examples are presented to illustrate the effectiveness of the proposed method. The model computing results indicate that the proposed method is practical, precise and reliable. The method provides valuable reference for the design and machining of hob cutters.     

Separated Teeth Gear for Grinding Test

A kind of rational structure gear,separated teeth gear,in applied to grinding test.The contadiction between the heavy weight of the tested gear and the high precision of the measuring instrument is ideally solved.The gear is tested and verified by experiments.     

EDM Generating Technology of Quenched Internal Gear

Based on the infroduction of the present process of quenched internal gear, a new technolgy of machining quenched internal gear-EDM generating technology is presented with its principle and machining processes. .     

One Dimensional Steady Model for Natural Ventilation of Solar Chimney

Solar chimney is effective to enhance the natural ventilation by heating the air with solar radiation. Based on the research by other authors, a revised mathematical model is proposed. One dimensional heat conduction model is proposed when the thermal resistance of both the glass cover and heat absorbing wall are taken into account. The mean temperatures of the air and heat absorbing wall, the air mass rate and heat collection efficiency in the solar chimney are calculated with the present model. The results of the present model are compared with the related experimental data and reasonable agreement is validated. It is shown that the present revised model is able to predict the temperatures of the air and wall, the air mass rate and heat collection efficiency more preciously than the original model.     

Influence of Motorcycle Noise on Gear Transmission

The study of motorcycle's acoustic signal shows that gears noise take a great proportion on the whole acoustic of motorcycle.So how to control the noiseof gears is very helpful for reducing the whole motor's acoustic.This paper discusses the engine matching with transmission system in reason,primary transmission and gear geometry design parameter & the mend of tooth body(tooth form & tooth direction) how to influence the acoustic of motorcycle.The study shows that the gear transmission System's matching with engine in reason can notable improve the efficiency of motorcycle.In the meaning time the exactly choosing the primary transmission gear geometry design parameter and the mend of primary transmission gear's tooth body can effectively reduce the acoustic of motorcycle.This paper has engineering practice sense.     

Mathematical Model of Control Cooling for Screw Rod After Rolling

The on line hot treatment can not only boost the strength but also gain lower cost. It is usually called tempcore which was developed greatly these years. The process of tempcor art is introduced and the core subject mathematical models is studied. According to the heating exchanging property of screw rod in cooling after rolling.Two mathematical models including beginning cooling model and cooling water amount model are obtained by analysing, deducing theoretically and simplifying mathematically. Its structure is simple and practiced .The parameter of model is obtained from measuring data of work site. It is able to suite the change of work site, so it can be used in practiced controlling.     

Dynaical Mathematical Model of String

In the process of oil drilling, drilling string and rock bit are main drilling tools. The fact of their failure would cause serious accidents. To solve this problem, the vibration law of string should be found. The longitudinal vibration model, torsional model and lateral vibration model are founded simultaneity. Many methods are used to build up this model, including finite element technique, numerical technique and computer simulation. The dynamic model reveals the dynamic action of string, it is instructive to design new rock bit and study drilling mechanics.     

The Model and Algorithm of Capacity Balance

In this paper,more carefully study has been discussed to the traditional MRP capacity cutting method ,the default is found. The optimizing thought is introduced in capacity cutting .A mathematical model of this problem is established . Base on this model, a new scheduling algorithm is put forward.     

New Technology of Profile Grindng for Tow Teeth Difference Cyclodal Gear

Two teeth diffenence cyclodal gears are the key parts in cyclodal reducer. The plate abrasive wheel method which is widely used at home has very low precision and productivity. So it' s the common problem to be immediately solved. The profile grinding technology discussed in this paper has been proved by practical production to be an efficient and economical cycodal gear manufacturing method.     

Design of Self-adjusting Planetary Gear Rotation Mechanism Based on Planetary Gear Structures Muster

Self-adjusting planetary gear rational mechanism can eliminate the influence of various uncertain errors in mechanism. Therefore ,it's method of self-adjusting designing is attented by machine designer. For seeking a simple, regular, and widely realizing self-adjusting designing way, this article uses approach of the follow text to design no over-constraint and self-adjusting mechanism. First, the article advances the conception of planetary gear structure muster and it's plotting basis, through using for reference the strategy and method of self-adjusting structure groups in planar linkage mechanism. Second, it designs the self-adjusting planetary gear structure muster, through analyzing the constraint and freedom of planetary gear structure muster. Third, it designs the self-adjusting mechanism, through adding aptitude rotational links outside of self-adjusting planetary gear structure muster. This mechanism can realizes the self-adjusting in the interior of muster and self-adapting in the exterior of muster. This designing plan possesses a series of excellence, such as, theoretical, simple, feasible, widely self-adjusting. Consequently, the mechanism can eliminate the working capability influence of various errors.     

Analysis and Discussion on Klinglnberg'' s Cyclo-Palloid Bevel Gear

Because of their machining characteristics,Klinglnberg' s sprial bevel gears have the advantage over Gleason' s in many ways,so that they are more and more widely used. This paper analyzes the meshing and machining properties of the gears and deduces the equations,normal curveture and contact ratio of tooth surface. It also lays a solid foundation for spreading and importing the Klinglnberg' s machine,and developing klinglnberg' s gears.     

降低低糖枣糕水分活度模型的建立与应用

为获得降低低糖枣糕水分活度的数学模型,通过试验筛选出适宜的水分活度（Aw）抑制剂组合,采用三因素二次回归正交旋转组合设计,研究3种水分活度抑制剂对降低低糖枣糕水分活度效果的影响。结果表明：适宜的低糖枣糕水分活度抑制剂组合为氯化钠、丙三醇和乳酸钠,其最佳组合配方为丙三醇添加量1.5%、氯化钠添加量1.5%、乳酸钠添加量3.0%,采用该水分活度抑制剂加工而成的低糖枣糕Aw为0.64。