Dissertation > Excellent graduate degree dissertation topics show

CAD technology based on the cone double enveloping worm gearing design

Author: MaHaiYing
Tutor: SuZhiJian
School: Zhengzhou University
Course: Mechanical Engineering
Keywords: entity modelling contact analysis
CLC: TH132.44
Type: Master's thesis
Year: 2007
Downloads: 85
Quote: 1
Read: Download Dissertation

Abstract

The worm gearing is used in transmitting the movement and driving between dimensional interleaving axletree, it is one of the most important transmission mechanism in the modern machine, it obtains the quite widespread application, which possesses good conjugate nature, like bearing capacity big, efficiency high, life long and so on. For all this, the worm drive still has such as the worm gear hob manufacture difficulty, the use cost higher prominent question, it has limited it further application in the actual production. The hourglass worm gearing drive, the multi-tooth crewel contact and the tooth face induction curvature are small, the stress of contact is small; Angle of slip approach 90°, it is of advantage to the elastic fluid dynamic lubrication between the faces of tooth, Now it becomes the researchful hotspot.Not only the image and the expression of blueprint have been required in the modern technique of manufacture, the three-dimensional model have been supplied. Because the CAD technology in the mechanical product design is applied widely, the research of entity modelling also arouses people’s interest more and more, which is one of the key links of the computer-aided design and hypothesized design carrying on the production, the established model should make every effort to describe all characteristics of the product as far as possible.In addition, making the accurate forecast to actual contact of tooth in its transmission process is also an important content that the worm designing and processing for the worm drive under the heavy load working condition. Three-dimensional model of worm has been obtained, in this foundation Three dimensional contact analysis of the worm gearing drive is realized, then the design quality of the worm pair will be improved. It has the vital significance.The cone-generated double enveloping worm gearing pair is one new type of hourglass worm gearing drive, it both has the characteristic of the plane-enveloped and ring-surface worm which are possible to quench and grinding, to be easy to realize the manufacture craft, and has the merit of the double enveloping worm gearing with straight side profile which are possible to avoid the problem of sharpening and undercutting. At present, this transmission has already been used in the producing of our country, but the wheelhead support structure was complex, but also not comprehensive used. This thesis centers on the conical surfaces double enveloping toroidal worm drive to conduct a series of theory research, and realizes its precise three dimensional modelling and the simulation processing using the CAD software. In the foundation that its precise three dimensional modeling have been obtained, three dimensional contact analysis of the worm gearing drive will have be carried out. The prime task is as follows:1. entity modeling of cone-generated double enveloping worm gearing driveThe three dimensional geometry construct is called the three dimensional geometry modelling as well as the three dimensional tissue construct and so on, it is one kind of technique for adapting CAD, the CAM development, which expresses the control, the analysis and the output of three dimensional entity consummating unceasingly which the computer system in the near stage. The precision of the entity modelling height affects directly the precision of the seeking contact point and finally of the line of contact and the cutting tool silhouette. This paper takes AUTOCAD as a platform and Visual Basic 6.0 as the secondary development tools to realize entity modeling of the cone-generated double enveloping toroidal worm gearing drive.2. Based on three-dimensional model contact analysis of cone-generated double enveloping worm gearing drivethe worm gearing three-dimensional model has been established , not only it may find the contact point and the line of contact under the general sense and reste on the traditional meshing analysis method, moreover it may carry on the entire tooth meshing analysis. The interference of tooth for design mistakes or wrong cutting parameter selection and so on can be discoveryed promptly in design process, or before actual processing . Simultaneously the intensity and the lubrication design of tooth may be pointed.

Related Dissertations

CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > The transmission mechanism > Meshing > Worm gear
© 2012 www.DissertationTopic.Net Mobile