完善自已
你这是什么问题啊？机械制图的标准就是机械行业为了表达零件、装配等一些结构而制定一些关于图纸表达，视图，线型，尺寸，公差，粗糙度，技术要求等所作出的规定。制图者只要按照规定要求制图、识图，就能准备表达，理解结构件的特征，化抽象为具体！
沙尘暴来袭
Car welding fixture in order to shorten the design cycle and improve design efficiency, multi-program evaluation to solve problems in the existing car welding fixture design work on the basis of the existing car welding fixture design and comprehensive evaluation of the traditional system profound analysis, clear in the program design and evaluation of decision-making shortcomings and lack of response to these points, combined with the existing technology and program evaluation CAFD decision-making method, the welding fixture of automobile design and program evaluation system will be design, evaluation and better integration of the manufacturing process, and developed a more practical car welding fixture design and evaluation system. First of all, this article has collated a large number of auto welding fixture design data based on an analysis of them, draw conclusions, summing up. Reference group code technology, the design of the car welding fixture of naming examples of automobile welding fixture code examples, and the use of CATIA and the database access method of VB to build a car welding fixture library examples. The design process in the program directly calls examples of single fixture. To improve the design of the automobile welding fixture and GM series of the degree of welding vehicle for the realization of the modular fixture design and lay a foundation. Secondly, the traditional method of fuzzy comprehensive evaluation of the defect, this paper presents the use of Vague sets, entropy theory of weights and the range of gray ash on the fixture a few ways to evaluate programs; will introduce a program of the gray system theory of fuzzy multiple attribute decision-making, Vague sets based on the formation and entropy weight coefficient of the gray car welding fixture program decision-making model. With the traditional evaluation methods, this can be effective in reducing the loss of information to ensure that the outcome of the decision-making objective credible, a true reflection of the merits of the differences among programs, and to have a higher resolution. Finally, the production stage fixture for welding a large number of engineering drawings drawn to repeat the question, this article has developed a car welding fixture elements of the project design module parameters. Commonly used generic parts, standard parts to use the module to generate two-dimensional engineering drawings, as long as the user interface parameters in the premise of matching the importation of the necessary design parameters and design information, will be able to automatically generate the corresponding parts of the graphics, a variety of sizes automatically tagging, automatic generation of map frame, title bar, technical requirements and fill in the title bar and other information. To achieve automotive parts welding fixture of the parameters of two-dimensional engineering drawings of generation, a reduction of fixture design staff, to improve the automobile parts assembly fixture design efficiency.
开运潇潇
砂带磨床 = Abrasive Belt Grinding Machine 或 Belt Grinding MachineBelt grinding is a machining method to process metals and other materials, with the aid of coated abrasives. The basic difference between belt grinders and belt sanders is the material being machined. Sanding is the machining of wood, grinding is the common name for machining metals.Belt grinding is a versatile process suitable for all kinds of different applications. There are three different applications of the belt grinding technology:(1) Finishing: surface roughness, removal of micro burrs, cosmetic finishes, polishing.(2) Deburring: radiusing, burr removal, edge breaking.(3) Stock removal: high stock removal, cleaning (e.g. of corrosion), eliminating mill or tool marks, dimensioning.Grinding Methods - Wide belt grinding is a familiar process in industry as well as home applications. There are several basic methods for belt grinding:(1) Stroke belt. (2) Platen belt. (3) Wide belt. (4) Backstand (pressure). (5) Centreless. (6) Portable (manual). In general there are three basic elements of the belt-grinding machine: work rest support, grinding head and a regulating head. These components differ for all the methods but in general the workpiece is pressed between the grinding head and the rest support. The objective of the regulating head is to coordinate the belt pressure.One of the most common methods is wide belt grinding. Timesavers Int. BV is a manufacturer of these machines.The belt grinding process is versatile by other adjustable components. The machines can be wet working or dry working. Furthermore a wide belt grinding machine can be constructed with single or multiple heads. The first head is used for coarse grinding and the next heads gradually makes a finer finish. Wide belt grinding is also used as a high stock removal method for special metals (e.g. stainless steel, titanium, and nickel alloys).There are several objectives possible for grinding with coated abrasives. Among them are the right application (e.g. finish or stock removal), time saving and efficiency of the abrasive tool.To achieve the above objectives, it is essential to look in more detail to the variables, which affect them. These include the work material properties, the grit and abrasive type of the grinding belt, belt speed, belt sequences, contact wheel hardness and diameter, serration, type of lubricant (or dry) and grinding pressure. Changing these variables will affect the performances of the belt grinding process.In the wide belt method, a contact wheel supports the abrasive belt. The selection of the contact wheel and abrasive to match the grinding parameters required for a specific operation is very critical. Stock removal generally requires a harder, serrated rubber contact wheel, and coarse grade ceramic abrasives. Finishing generally requires the use of a smooth faced contact wheel and fine grade abrasives.
