Research On 3-D Digital Molding Base On Pro/E & NC Machining Process Of SD8 Bulldozer's Main Frame Part

As an important method in mechanical product designing, 3-D CAD technology having been popularized rapidly thanks to its visual character in 3-D space and is fit for creative designing. Since most of 3-D CAD software have interface with those professional software in CAE CAD and so on, the application of them become necessary in CAX work. Base on the 3-D digital molding of SD8 bulldozers'main frame part, this paper involved researches in designing method, manufacturing process, finite element dynamical analysis and NC machining. The paper consists of six chapters, given as follows: Chapter 1 Introduction Being a kind of good 3-D software especially in its excellent surfacing function, Pro/E is capable of molding much complicated molds. Using two utilities LAYOUT and SKELETON, designer can carry out the TOPDOWN concept in assembly product designing in Pro/E environment. TOPDOWN concept is suitable to creative design idea very much, in which designing is started from concept design and end with perfect detail gradually. TOPDOWN designing method can be easily extend to concurrent designing. In addition, the digital 3-D technology is also the necessary workbench for much advanced technology in engineering such as CAE, Virtual Reality and CAM. In manufacturing field, NC technology has been a base just like the 3-D in designing. Many a technology starts from NC for instance flexible manufacturing, virtual manufacturing and so on. Nowadays the NC technology any device development in the world appeared with some characters as with high speed, high efficiency, high accuracy, high reliability, intellection, web, flexible and green. Chapter 2. 3-D Molding of Main Frame in PRO/E Advance surface and style is the highlight in PRO/E's surface molding. In surfaces designing of the rear box involved in this chapter, we mainly used the boundary function in the Advance Surface module which is the most important utility for complex surfacing. Sometime in some complex molding work, the mold being processed should be broke up into some simple elements, and after finishing these simple molds merge them as whole mold again. This is usually more easily. In this box'molding, the decomposing in designing front surfaces and inner cavity are good examples. During the designing of main frame, because of the using of NOTEBOOK and SKELETON, the whole design can be carried out by the means of TOPDOWN concept, in which all designing process finished in the light of the coherent thought. The integrating of TOPDOWN and Pro/INTRALINK can lead the designing to concurrent engineering easily. In this chapter, the main contents discussed are the surfacing and the TOPDOWN method in assembly designing. Chapter 3. Plan the Process of The Bulldozers'Main Frame Part Our adoption of procedure integration is the solution to the problems in the Main Frame's machining. In this plan the five-face machining center is the real center machining device, as its name, in whole process. The entire machining process has more advantage than the partial process used before because it can solve the many problems of distortion caused by welding, surface damage by transporting and position error by partial machining. Research on entire machining is the main content in this chapter. Chapter 4. Analysis of Milling accuracy and Choice of Cutting Parameters Because the hole with diameter of ф860H7(0+0.09) in rear and two holes with diameter ofф560H7(0+0.07) in two flank side are too much to bore in the machining, they have to be machining by the method of milling. Thus the milling accuracy should be evaluated and rational milling parameters should be determined too. Taking advantage of the ANSYS, a finite element analysis software, in structural dynamics analysis, i.e. Modal and Harmonic Response Analysis, of milling tool on which milling force exerted. The dynamics response to the forced vibrations in tool can be predicted. Thereby the machining error in various cutting load can be predicted and rational milling parameters consequently can be produced too. So the main purposes of this chapter are milling force analysis, calculating the millingforce, application of ANSYS in milling tool's dynamics analysis. Chapter 5. NC Programming for The 5-Face Machining Center In many enterprise, manual programming is also the main method in NC machining, and manual interference is always required during machining in machining centers. In this manufacturing condition, the standardization and readability of NC program are necessary. In the usage of 5-face machining center, we make full use of the powerful parametric programming and subprogram functions, provided by the OKUMA NC system, to make the program simple and easy to read by programming standard subprogram. We also make the standard format for the 5-face machining center. It has been proved by the machining practice that using the program format standardized is good at reducing mistakes and improving efficiency. Programming methods in 5-face machining center are researched in this chapter. Chapter 5 Conclusion and expectation The chapter gives the main conclusion obtained in this paper and the prospect for next research.