模具专业毕业论文外文翻译-精密体积成形模具的设计制造及发展.doc

Volume precision forming mold design and manufacturing and developmentAuxiliary processing technologyIn the production process, improve die life is a complex comprehensive issues. All forging process, especially the net shape and approximate net form processing technologyMuch depends on the accuracy and quality, depending on the technology level of mould. Mould technology reflected in moulding design and manufacturing,And die life with the above two links in the outside, still and use the link. Improve die life is of great economic benefits, generally in the trial production mold tooling cost accounting for stage production cost of about 25%, and finalize the design production is only 10%.Die early failure forms, many for the punch and die of fracture bore edge collapse, flash in the bridge chap, cavity occurred crack at the bottom.Many factors influence the life of die a wide range and die design the life of die is based. Die design link is refers to the mould structure plan, setForming design and determine the cavity of the steel, mould hardness etc. Mould manufacturing process is to point to die making technology, heat treatment standard and surface treatment technology, etc.In this paper, only from the mold design and die manufacturing two aspects to study and improve the life of die measures.1, the reasonable design precision volume forming a (fine forging)Die forgings should try to avoid with holes, narrow slot, Angle, shape should as far as possible is symmetrical, even if they can't do axisymmetric, also hope to achieve,Under symmetrical or left, right symmetry. To design mold pulling out rake, avoid stress concentration and die forging units, increasing the pressure overcome eccentric loading and mould wear not equal defect.For forging die cavity edge and bottom fillet radius R, design should ensure forgings cavity is easily filled with the premise of amplification.If the fillet radius is too small, easily cavity edge in high temperature and high pressure of collapse, the serious will form the reversed cone, influence die forgings the mold.Such as the bottom fillet radius R is too small and is not smooth transition, it's easy to crack and will continue to expand.When the mould design should make full use of CAD system for products function 2 d and 3 d design, to ensure that the products to the unity of the original information and accuracy,Avoid man-made errors, improve the mould design quality. Three-dimensional modelling product in forging process to reflect the product before comprehensive external shape,Timely find that the original design of the possible problems, at the same time, according to the product information, a computer design processing die-cavity roughing electrode, ready for the follow-up mold processing.The CAM technology can design according to the electrode accurately designated production mode. Adopt CNC milling machine (or processing center) processing electrode,Can ensure the machining precision of the electrode and reduce the time of the mould try, reduce scrap rate of the die and FanXiuLv, reduce the amount of fitter.For some complex shape, high accuracy of forgings,By the conventional die locksmith mould manufacturing methods guarantee certain size and shape using CAD/CAM technology in the complex forgings precise dimensions description,The determination of reasonable parting surface to ensure accuracy molmerged, from the mould manufacturing this link to ensure product precision.CAD/CAM/CAE technology can be finite element analysis, the size of the key parts of the design is reasonable can provide modification basis,Thus in for customers with high quality forgings, but also for the design of the customer provide the basis, strengthen the cooperation with the customers.Forming is the most important in the process of die forging work step, die forgings geometry is to rely on to ensure the forging die, die forging process to fully consider all sorts of factors,Especially in production possible or has exposed problems, in the mold design measures should be taken to reduce the follow-up process of processing difficulty. According to this principle in prevention to reduce die forgings craze and deformation, improving forgings qualified rate, can have pointed to take some countermeasures and measures. Such as forgings in certain parts of the machine and punching easily to affect the quality of products and deformation,But in the forging die design appropriate increase deformation parts of the machining allowance compensation, this is when the large deformation forging machine thin flange is more important.For some with stem and stem diameter relatively small forgings, in trimming and heat treatment process will produce regular geometric distortion,And with cold correction methods do not or difficult to straightening. As a factory TS60 crankshaft,According to the practical experience and statistical data center in advance will be in a certain range of reverse migra。