The process designing of spare parts CNC Machining of MasterCAM

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Summary: ? Small time masts the characteristic of AsterCAM software mixes Shu ancienting name for a water catltrop south regret applied method, how to apply MasterCAM to undertake mechanical design and treatment undertook study. Keyword: CThe development of NC Machining;MasterCAM;CAD/CAM1 preface as contemporary and mechanical industry, CAD (CAD) and CAM (CAM) already showed tremendous potential, in applying extensively at products plan and machinery to make, the NC program code that use CAD/CAM system generates can replace traditional manual process designing, apply CAD/CAM to undertake the design of the spare parts and treatment are made, can make the industry improves design quality, shorten production is periodic, reduce product cost, obtain good economic benefits thereby. The is based on PC platform CAD/CAM system that the CNCSoftware company that MasterCAM software is the United States develops, because it is right hardware demand is not high, and operate have good price performance to compare, get consequently the welcome of vast enterprise user and project technology personnel, wide application is made at machining, mould, the domain such as auto industry and spaceflight industry, it has imitate of substance of imitate of method of design of design of graph of 2 dimension geometry, three-dimensional curved surface, cutting tool, treatment to wait for a function, offer friendly interactive, came true to design the CAD/CAM unifinication that makes to treatment from the geometry of the product thereby. It is one of CAD/CAM software with the at present widest application on the world. The function of 2MasterCAM software and applying MasterCAM is a kind of function powerful CAD/CAM software, by CAD and CAM two much are comprised, divide into Design(modelling) , mill(milling is machined) , Lathe(turning is machined) with Wire(line cut) 4 functions module. Collect design and make at an organic whole, undertake through the part that designs to place craft is analysed machining, and scale geometry graph and build a model, with reasonable treatment measure gets cutting tool way, the aftertreatment that adopts a program generates code of CNC Machining instruction, be defeated by a person to arrive numerical control machine tool already achievable treatment. Combinative example introduces software MasterCAM software below in CNC Machining automatic process designing use. 2.

Graph of analysis of craft of treatment of 1 spare parts shows the part drawing that is treatment 1 times, before applying MasterCAM software to undertake CNC Machining automatic process designing to the spare parts, want to undertake to the spare parts craft is analysed machining above all, decide reasonable treatment is ordinal, in the exterior surface roughness that assures a spare parts and treatment precision while, want to reduce the number that change a knife as far as possible, improve treatment efficiency, the appearance of mature spare parts, dimension and treatment precision, and spare parts stiffness and be out of shape wait for an element, accomplish the treatment after; of less important surface is being machined to machine datum plane first after; of the finish machining after rough machining machines main surface first first other surface. The graph shows a spare parts 1 times to be able to be finished through turning treatment, the round lathe tool, 5mm is wide grooving knife outside using cutting tool to have and outside whorl lathe tool. Is the technological process that this spare parts machines on numerical control lathe: ? Cast  needs Huan of ぁ ⑶ coerce needs? thread machining is cut off finally. If this spare parts uses circular instruction to undertake process designing, criterion the program includes the following shares: 1) the grooving of;3) of program of thick, finish machining that coordinate department reachs those who machine craft parameter to appoint program;2) outline to circulate circulates the truncation with final;5) of machine program of loop of whorl of machine program;4) machine program. 2.

The geometrical model that the geometry of 2 spare partses builds a model to build a part is the foundation that realizes CNC Machining, medium any module has MasterCAM4 big module to have 2 safeguard or design a function three-dimensionally, have stronger (CAD) plot function. Can apply Design module to build a model, also can use Mill module, Lathe module and Wire module to build a model directly according to machining a requirement, because a lot of data were set inside software system,change archives 〔 1] at the same time, can be like the graphical file of all sorts of types AutoCAD, CADKEY, the graph on the software such as Mi-CAD is changed to MasterCAM use on the system. The model is built in what have a part when, the model that need not draw whole part comes, the contour line that needs a picture to give its to machine a part only can, treatment dimension, form tolerancepublic errand and fits tolerance need not line out, save the time that build a model already so, when the need; that can satisfy CNC Machining again builds a model, should come according to the real measure of the spare parts scale, can machine those who differ in order to assure the validity; of the coordinate of cutting tool method that computation generates working procedure to part scale pursues at what differ inside the layer, use the function of layer of the graph in MasterCAM, when method of affirmatory cutting tool, try to call or be concealed, in order to choose the contour line that treatment needs. The graph shows the part of treatment 1 times, do not need to draw part drawing entirely in the process of the plot that build a model, the outline that needs a picture to give a part only can 2.

After 3 spare partses machine what cutting tool method decides a part to build a model, the basis machines the arrangement of craft, choose the cutting tool that place of corresponding working procedure uses, according to the requirement of the spare parts the choice processes semifinished product, choose workpiece coordinate origin correctly at the same time, build workpiece coordinate system, department of certain work coordinate and the opposite dimension that machine tool coordinate fastens, have all sorts of craft parameter set [2] , get the cutting tool way of spare parts treatment thereby. MasterCAM system can generate NCI of corresponding file of technical data of cutting tool method, it contained the contrail of cutting tool motion with all good settings and treatment information. The graph shows a spare parts 1 times to be able to have all sorts of craft parameter set with MastercamLathe, get the cutting tool way of spare parts treatment. 2.

After the imitate CNC Machining of 4 spare partses installs good cutting tool to machine method, the part that uses MasterCAM system to offer machines imitate function, the process that can observe cutting is machined [3] , usable will detect the setting of craft parameter is reasonable, the spare parts is in whether is numerical control put in interference in effective treatment, the moving movement of equipment is right, whether does actual part accord with design requirement. It is at the same time in treatment of numerical control imitate, the system can give out to report about what machine a process. Can try cut course in the leave out in actual production so, can reduce material to use up, improve manufacturing efficiency. 2.

5 generate numerical control to dictate code and program are transmitted through computer simulation CNC Machining, affirm when according with effective treatment to ask, a future life of postposition processing program that can use MasterCAM becomes NCI file or code of NC numerical control [4] , masterCAM system itself offerred more than 100 kinds of postposition to handle PST order. To different numerical control equipment, system of its numerical control may be endless identical, chosen postposition handles a program to also differ somewhat. To specific numerical control facility, the postposition that should choose correspondence handles an order, after postposition handles classics of generated code of NC numerical control to be revised appropriately [5] , if can accord with the requirement that uses numerical control device, can export numerical control equipment, undertake CNC Machining is used. 3 epilogue introduce the builds a part geometry model with MasterCAM can convenient software, rapid and automatic generate numerical control code, shorten the process designing time of process designing personnel, particularly right the numerical control to program of complex part, can enhance the validity of the program and security greatly, reduce manufacturing cost, improve work efficiency. CNC Milling