【導讀】收線時如果線絲的張力過大，絞線機和收線機之間的線絲將會受到很。等現(xiàn)象；或者在成品卷筒上產(chǎn)生滑套現(xiàn)象，這些都會影響生產(chǎn)的進行。于是上述問題就成功地得到了解決。距可調(diào)、排線推力可變的并且?guī)в嗅尫叛b置的排線器。時能夠使線絲整齊地卷繞在收線盤上，較好地實現(xiàn)了排線功能的要求。

　　

【正文】 t progress. The automatically programmed tool (APT) appeared in 1960’s promoted the development of NC technology dramatically. APT is also used widely at present, but it also has some defects, such as low efficiency, etc. at present, the development orientation of NC is to merge CAD and CAM into an anic 哈爾濱理工大學學士學位論文 29 whole, so CAD/CAM is a unified software system, in which the CAD portion is interfaced inside the puter with the CAM system. Therefore the track of cutting tool is created with the mode of manmachine interaction by using the geometry data fully which is created in the phase of CAD. Now a new programming technique has been e into using—graphic numerical control (GNC) based on graphic. In the system, cutting tool, workpiece and fixture are displayed on puter screen by generating animation, so the track of tool is optimum and safety. In sum, GNC system is very efficient and convenient. application of IDEAS software in practice Our advanced manufacturing technology center (AMMTEC) of harbin institute of technology makes an effort to develop integrated system of CAD/CAM/CAE. AMTEC was founded in 1992. it imported many NC machines and large style engineering software IDEAS (integrateddesign engineering analysis software) with which equips IBMRISC 6000 work station, so we have the condition to apply plastics molding CAD/CAM/CAE system to design, analysis and manufacturing of plastics molding . IDEAS is a type of synthetically automatic software. It integrates the functions of design, drawing, engineering analysis, digital simulation of plastics molding, numerical control programming and test. The families of geometry modeling, plastics analysis and graphic numerical control constitute a plastics molding CAD/CAM/CAE system. We would design and manufacture a set of molding which produces the plastic pedal of “jetta” car (product material is nylon66) for the first Automobile Work of city of changchun. It is difficulty to design and manufacture the molding because the shape of pedal is very plicated, so we decided to apply the families of IDEAS to design, analysis and NC programming. IDEAS solid modeling is an important ponent of IDEAS. It supplies a set of functional tool for geometry modeling and detail mechanical design. The 哈爾濱理工大學學士學位論文 30 method of solid modeling is constructive solid geometry (CSG). The steps are in following: (1) creating basic elements, such as cubic, cylinder, sphere, etc. (2) disposing the basic elements by using Boolean operation. So the plicated geometry can be created. Using these steps, the three dimensional geometry modeling of pedal can be created. puter graphics enable the designer to study the object by rotating it on screen, enlarging a specific portion of the object to observe it in detail. Finishing the preliminary design of molding, we can perform an injecting simulation to evaluate the design by using the family of plastics analysis which uses finite element method. IDEAS provides three methods of creating the geometry shape of finite element. (1) from the family of solid modeling. (2) From the family of itself. (3) From other CAD system. Because the product modeling has been created in the family of solid modeling, we can use the first method to avoid reconstructing. After selecting elements, creating elements, creating mesh and checking modeling, we can create the finite element model used to perform plastics analysis. In this design, it is difficulty to decide where to set the gate. we can see that the pedal is slender. According to mon concepts, the gate should be set in the middle of product. Welding line would e into being if this design is adopted. Therefore mechanical strength of product will be reduced. In practice using, the middle of product would bear heavy force, so it is not safety to set the gate in the middle of product. Finally we set the gate at the top of product to ensure the mechanical functions of product. In this design the fluid orientation would be consistent in the molding, and the mechanical function could be ensured, but the temperature of tip fluid will drop much more because of the long route of flowing, the fluidity of fluid bees bad. It is necessary to raise 哈爾濱理工大學學士學位論文 31 the pressure of entrance to fill the impression, but the raising is limited in certain range, so it is possible that the impression could not be filled fully. When we simulated the process of injection, the initial result was always unreasonable that the pressures of impression exceed that of injecting jet supplying. after analyzing, we modified the injection parameters. The temperature of molding and plastics fluid are raised so that the fluidity of fluid became good. Though the correcting, the results are very satisfied. The filling time is shown is . we can see that the filling time is second at which is the furthest from the gate. The pressure and temperature of analysis results are also in normal range. In actual molding, we adopted corresponding steps according to the analysis results, so the qualified products were produced. DEAS GNC is a new kind of NC programming tool based on graphic. GNC system has the function of creating and operating of plicated surface elements. We could also use the method as same as that is used in plastics analysis, namely, the geometry model was gotten from the family of solid geometry modeling. Thereafter we use a set of describing instructions to define the machining process and parameter, such as cutting tool, manufacturing orientation and step, etc. the system would display the manufacturing process. At the same time the cutter location (CL) file es into being which includes all manufacturing information but cannot be discriminated by NC machine directly, so the postprocess is necessary. The postprocess of