共查询到20条相似文献，搜索用时 62 毫秒
1.
Yan YongTang Zilin 《保鲜与加工》1993,(6):138-143
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. 相似文献
2.
Numerical control last making machine is a machine that is used to process shoe last. A new principle of numerical control machining shoe last is put forward aiming at the deficiency of current carving last system. On the basis of the principle, the algorithm of cutter machining position during numerical controlled carving last is analyzed in detail. The complex problem of the calculation of cutter machining positiion is resolved by applying spherical milling cutter that is often used in machining free_curve surface today and taking account of practical situation of the shoe last_making machine. At the same time, the calculation of cutter machining position is realized by program using Visual C++6.0. As a result, the calculation time of cutter machining position is reduced greatly and the efficiency of design is improved. Moreover, the process of carving last is agile and precision of carving last is ensured. 相似文献
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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. 相似文献
5.
Aiming at the backward hand-grinding ways of controllable pitch propeller in China shipbuilding industry, a highly efficient precision grinding method is brought forward, and a four axes simultaneous grinding machine is designed which can machining complex profile with abrasive belt grinding technology by CNC. The key techniques to develop this new grinding machine is presented in detail such as heavy-duty belt grinding head, NC grinding computer aided software, etc. The application experiments of grinding and polishing propeller blade are carried out on the basis of different parameters, and the trial results provide foundation for the confirmation and application of reasonable belt grinding and polishing parameters. 相似文献
6.
On the basis of applying three dimensional discrete formative technology to describing last surface, working principle of numerical controlled last carving machine is briefly introduced. Then the algorithm of ascertaining milling cutter machining position during the machining process is analyzed in detail. We establish a three dimensional reference frame with spatial analytic geometry and obtain the spatial equation of milling cutter rotary surface. According to last machining character, we put forward a machining algorithm named Minimal Distance Method and is used to calculate the milling cutter machining position. Finally, the glabrous degree of last made by us has reached the conventional demand. 相似文献
7.
Based on coordinate measrement of tooth surface of ZC1 worm, the deviation function for evaluating tooth surface is established. According to minimal zone principle, the profility of tooth surface of worm is evaluated. The machining errors of the worm are divided into setting error and adjusting error of the machine and tool. By error compensation, the setting error and adjusting error are corrected and the manufacturing precision of the worm is improved. 相似文献
8.
Tan Jianping Zhang Guanghui 《保鲜与加工》1988,(1)
On the condition of avoiding the"undercutting,"and "sharpening" of worm tooth, it is now regarded as an important subject in the field of meshing principle studying of the "multiple-thread small reducation ratio" hourglass worm gearing with developable tooth surfaces to reduce the gorge pitch circle diameter of worm, raise meshing efficiency and strength of the wheel tooth and improve the unresonable structure of the pair. In this paper, a new type of hourglass worm gearing with developable tooth surfaces -"Sphere Re-nveloping Hourglass Worm Gearing" is studied. It shows that 4a satisfied result to above subject can be obtained if this worm gearing is applied. 相似文献
9.
Liang Xichang Shao Ming 《保鲜与加工》1993,(1):1-6
The 12 new technologies in gear machining, which have been developed
Chongqing University, have been selected in"The major Extending Plan of National Technological Achievements". Apart from a brief introduction to thise technologies,this paper presents the basic principles and the levels of forming grinding .special shaping gear,sycloidal gear machining and internal gear machining technologies. 相似文献
10.
Application of Error Compensation Methods in High Precision Machining of Globoid Worm 总被引：5，自引：0，他引：5
鲜食葡萄始终占主导地位是我国葡萄产业发展的一个突出特点.长期以来,我国鲜食葡萄贮运保鲜业一直比较滞后,基本是季产季销,地产地销.因此,我国鲜食葡萄集中产区经常出现采后"运不出、贮不进、销不掉"的被动局面,阻碍了鲜食葡萄产业在适宜栽植区的快速发展.一些非适宜产区为了填补当地鲜食葡萄市场空白,也在积极发展鲜食葡萄生产,其结果必然导致生产成本提高,不利于我国鲜食葡萄的区域化种植和商品化生产基地的建设. 相似文献
11.
Based on study of elastohydrodynamic lubrication (EHD) and meshing theory of planar worm gear drive, EHD model for the drive is proposed. Minimum film thickness on the whole contact area is calculated. EHD status for the drive is analyzed. The distributions of film thickness show that, EHD status during entry engagement is better than that during exit engagement, and EHD status of worm addendum area is better than that of dedendum area. Influencing factors such as work conditions and optimized parameters along with their effects were analyzed. Theoretical analysis suggests that the optimizing pressure angle and increasing worm pitch diameter have influence on improving lubricant performance of the planar worm gear drive. 相似文献
12.
Aiming at the problem of machining quenched internal helical gears, a method and its equipment are discussed and designed, which is used for machining quenched internal helical gears by EDM. Its characteristic and principle are proposed. The modifying design of the electrode gear and the calculating method of its modification coefficients is presented. Analyzing for the error of the machining equipment is done. The results show that this problem can be solved by EDM, the electrode gear is the modification gear of machined gear and the machining accuracy can be improved by controlling errors. 相似文献
13.
Cone enveloping cylindrical worm in traction machine as instance, theoretical analysis on cylindrical worm transmission has been theoretically analyzed, and efficiency test and load capability test of traction machine with YJ240 cylindrical worm have been done on open power gear experimental instrument. According to the experimental data, it indicates cylindrical worm have some weaknesses on load capability, efficiency, adjustment possibility of tooth backlash and so on. Therefore, on purpose of improving integral performance of traction machine, face worm with variable tooth thickness may be used as primary drive mechanism in traction machine instead of cylindrical worm. 相似文献
14.
To remove the brittle material in ductile state can help to improve the machined surface quality.Experiments of material removal mechanism for NdFeB are conducted by using tangential ultrasonic vibration assisted grinding,axial ultrasonic vibration assisted grinding and normal ultrasonic vibration assisted grinding.Based on the critical condition of brittle-ductile transition,the effects of different ultrasonic vibration modes on material removal mechanism are analyzed.Results indicate that the material is mainly removed in the form of plastic shear in axial ultrasonic vibration assisted grinding.The material is mainly removed in the form of transgranular fracture,plastic shear and little intergranular fracture in tangential ultrasonic vibration assisted grinding.While in normal ultrasonic vibration assisted grinding,the material is mainly removed in the form of fracture crash and the cracks remain in the machined surface.So axial ultrasonic vibration assisted grinding is the best machining method to realize the ductile grinding on brittle materials. 相似文献
15.
随着我国果品加工业的迅速发展,水果清洗机的应用越来越广泛,为此,研制了一台轻便灵活、适用于中小型企业的喷刷式水果清洗机。介绍了该机结构特点、工作原理,以及水果清洗刷的清洗过程分析,确定清洗刷辊转速ω与出料翻斗转速n的关系。该机采用了带螺旋板和毛刷的清洗刷辊,采用蜗轮—蜗杆传动形式,运用出料翻斗将水果清洗后送出机体,具有启动平稳、工作可靠和效率高等特点,适合苹果、桃和红枣等水果的清洗加工。 相似文献
16.
Pitch error measurement of high-order oval bevel gear on three dimensional measuring machine 总被引：2，自引：1，他引：1 
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下载免费PDF全文 Based on the prototype workpiece which is manufactured according to the high-order oval gear envelope method,a measurement method of high-order oval bevel gear is proposed in order to verify the correctness of design and manufacture method for this gear pair. The mathematical model of measurement and evaluation is established according to the spatial gear engagement theory. Then the coordinate point set obtained from three-dimensional measuring machine is analyzed and filtered based on the actual measurement on prototype workpiece. Therefore,the ideal element is available. And then the aberration curve of pitch curve,individual circular pitch error and accumulated error can be obtained after analyzing the point set. Finally,the conclusion that the high-order oval bevel gear pitch error evaluation method is feasible can be obtained because the measurement and analysis result dovetailed basically with the theoretic calculation result. 相似文献
17.
Liang Xichang 《保鲜与加工》1989,(1):1-7
The paper describes a new theory and methods for designing hyperbola, degenerate circles, involute and roulette curves which have been applied in grinding convex involute gears, cutting special profiles on a gear shaper, grinding the race-way of ball thrust bearings, form grinding and grinding cyclo-cycloidal gears with an abrasive belt. All these applications have been used in industruy with considerable benefits.
The curves are produced by different combinations of straight line and circle motions, Given the curve parameters of the workpieces to be machined, the best approximate curve can be obtained from a computer program designed for this purpose. 相似文献
18.
The paper describes the design of high efficiency soft throw away wheel whose tension of abrasive belt is adjustable.With the airbag internal capsule and continuous spring ring structure,grinding vibration is decreased and machining accuracy is improved. 相似文献
19.
Huang Tianming Yan Yong Liang Xichang Zhan Jie 《保鲜与加工》1993,(1):18-24
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. 相似文献
20.
There exists muchinterference in machining internal spiral groove with big lift angle and small size, whichis a difficult problem. The design and calculation of tool section is analyzed in this paper while differentcutters are utilized to machine the groove when the tool axis is parallel or skew to that of the work piece. The approximating method of using circular-arc cutter is put forward, which is proved by the calculation and analysis to be a feasible method within range of the permissible error. The digital simulation of machining internal spiral groove which is finished by different methods, such as simulation of tool path, error analysis, verification of the cutter design and so on, has been done through typical software such as the Program files function of I-DEAS and the Manufacturing Module of UG. 相似文献