Abstract In order to improve China's railway freight capacity， and can better adapt to the existing railway line bridge， the actual state of development of load 70t， axle load 25t new GM vehicle has become an important 70t class in this new type of general goods on behalf of the C70-type models based on the general development of the gondola car design high side gondola car， named C70GB High side gondola car C70GB Department of General gondola car， the vehicle for the quasi-gauge railway in China， big shipment of goods， or the proportion of small goods in bulk， can be used for self-organization of fixed rail In a given vehicle performance and size parameters of the main conditions， the completion of the overall vehicle design and large parts， including chassis， side wall， side walls， doors and other structures， as well as the hook relief device， the selection of the Combination of design requirements on goods 70t-class key technologies and design ideas， including the lightweight body design， 25t axle load bogie Pre-design work of the main research process， analysis of issues in program selection and design， and finally through the computer graphics software to complete the overall design of vehicles and parts， in this paper based on the combination of drawing and calculation of theoretical analysis and presentation of Through the introduction of new materials， new technologies and new structural design C70GB from the high side gondola car technology to improve vehicle performance， increase rail freight capacity， China has laid a railway truck load 70t from 60t-class upgrade to the basic Keywords: gondola car; technical parameter; structure; bogie
The design of Block entitled rocker shaft technology and equipment design and CAD / CAM From Chaoyang Diesel Engine Company LThis is designed to complete the 195-seat rocker shaft diesel engine mold design， Rocker Shaft Tower card processing routes and the development process， some special fixture design Three-dimensional modeling software Pro / E into the mold of its design， including: the construction of a module with parts and blank parts of the solid model; on the part of the investment casting mold design， including sub-surface， injection system， pushing pieces of bodies， punch and die， mold base， ， with engineering drawings and CAXA electronic board module to complete the mold assembly Order to develop machining technology， including process selection， process development line， the determination of machining allowance， and then calculated according to the technical point of order parameters and the appropriate technology to produce the Special milling fixture design， 2 sets of special drilling jig 1 set: the analysis， selection and design， the use of CAXA electronic drawing board to complete its work The design of the difficulties is the fixture and die， in the access to a wealth of information and very good teachers under the guidance of the final settlement of these issues， the successful completion of the
IntroductionMachining aims to generate the shape of work-piece form a solid body，or to improve the tolerances and surface finish of a previously formed work-piece，by removing excess materials in the form of Machining is capable of creating geometric configurations，tolerances， and surface finishes often unobtainable by any other However， machining removes materials， which has already been paid for， in the form of relatively small particles that are more difficult to recycle and are in greater danger of becoming Therefore，developments often aim at reducing or-if at all possible-eliminating machining， especially in mass For these reasons， machining has lost some important markets， yet， at the same time， it has also been developing and especially having captured new markets with the application of numerical Some feel for the important of machining may be gained from the observation that in 1983 there were about 2 million metal-cutting machine tools in the unite states ( of which some 5% were numerically controlled ) and that labor and overhead costs amounted to $125 billion， or 3% of the GNP
