AutoCAD environment issues the algorithm that reducer axis designs and implementation summary: Be based on AutoCAD2000 platform, discussed the crux issue in CAD of reducer gear axis, offerred the mechanical model of reducer axis and structural feature, the rod that uses development designs a program, design of the intensity computation in making the axis is designed, structure and plot become an organic whole repeatedly, make the automation design of reducer becomes a possibility thereby. Crux word: Reducer; Axis; In design of reducer of CAD 1 overview, the part with the largest difficulty should count the tine axle of reducer. Gear axis is the spare parts on the axis that prop up, deliver motion and dynamic key part, its design contains two main content: Intensity computation and structure are designed. In be being designed actually, this both cross correlation, interact, in addition, the structure that the axis assembles the part on the position, axis mediumly in reducer casing body and assemble the structure that can affect an axis directly and intensity, the design of gear axis is very consequently complex, it is reducer design is medium all the time " bottleneck " . The research of the article depends on discussing development utility program, implement the automation that reducer gear axis designs, make design of intensity computation of the axis, structure, job pursues scale unifinication, reflect the characteristic of CAD system truly, improve products plan efficiency and design quality thereby. We go up in the platform of AutoCAD2000, regard development as the tool with ObjectARX, make full use of Visual C++ visible process designing, facilitate wait for a characteristic interactively, and function of the 2 dimension with powerful AutoCAD2000, three-dimensional plot, design the tradition as organic as computer technology union, make reducer is designed " bottleneck " problem be able to better solve. The mechanical model of 2 gear axis builds the mechanical model of gear axis, it is one of design automation keys that realize reducer gear axis. Above all we undertake an analysis to the circumstance getting power of actual reducer. Graph 1 reducer diagram pursues 1 be what compare a pattern is conic reducer of one columnar gear, there is 3 gears axis on its, every axis all is propped up by two bearing go up in casing, axial structure and suffer force to have a characteristic each: I axis is extended outside two end, two end install the axis respectively of bevel gear, shaft coupling (or belt annulus) , the axial force that bevel gear end is transmitted by II axis and tangential force, shaft coupling end and prime mover are linked together, accept prime mover to be defeated by the person's torque; II axis two end brief the share is extended outside notting have, two prop up between installation has two gear wheel, the axial force that gear is transmitted respectively by I axis, III axis and tangential force; Extend outside III axis one aspect of the matter, end is extended to pass shaft coupling outside (or chain wheel) be linked together with working machine, dynamical output. Inspect all sorts of different reducer, the circumstance getting power of its axis basically has 3 kinds of such forms. The diagram getting power of 3 kinds of forms is shown 2 times like the graph. 3 kinds of when encircle 2 axes diagram getting power analyse the case getting power of these 3 kinds of axes, according to mechanical principle, undertake inducing arranging, expression is in XYZ of department of dimensional rectangular coordinates, if pursue,3 are shown. Graph the mechanical model of 3 axes among them, pedestal place sets axial B to fasten origin for coordinate, edge axes direction is set for X axis, perpendicular set at the direction of axes for Y axis and Z axis, form reducer gear axis to get force model thereby. On model getting power, distributing have the following kinds of load: Perpendicular direction concentrated force (Fy1, fy2) and moment of force (My1, concentrated force of way of My2) , standard (Fz1, fz2) and moment of force (Mz1, mz2) . Perpendicular return power (Rva, rvb) , level is raised return power (Rza, t1 of the torque on Rzb) , axis, T2. The measurement of each bits of force on the axis is different, but the rod getting power that evolution becomes different type: If C manages each force for 0, form the axis getting power of I type; If A, E manages each force,be 0, and C place force is decomposed for two force, form the axis getting power of II type; If E manages each force for 0, form the axis getting power of III type. According to mechanical principle, part each force to coordinate face umbriferous, the curved quadrature that gets an axis to assume office to was in is as follows: two plane the synthesis that bend quadrature is one space to bend quadrature, total curved quadrature will bend quadrature M and equivalent of torque T synthesis to bend quadrature again: According to afore-mentioned computational results, scale gives equivalent to bend quadrature graph, final according to examines axial danger is sectional, make sure any place in the axis are sectional on, have need to undertake redesigning otherwise. The intensity design of the axis of gear of structural feature reducer of axis of 3 reducer gear is not isolated undertake, spread out on the foundation that designs in the structure. The structural design of reducer gear axis basically is the reasonable external form that uses affirmatory rod (each paragraphs of diameter reachs the axis length) the whole structure dimension with the axis. Structural design of the axis should satisfy: The spare parts on axis and axis can secure firm, location is exact; The spare parts on the axis should be installed tear open and adjust convenient; The axis should have good workmanship sex; Reduce stress concentration as far as possible; The axis gets power reasonable, economic data and reduce weight to wait. Abstraction gives the structural feature of reducer axis, another key is in the design automation that is axis of implementation reducer gear. Reducer gear axis is a flight of stairs more commonly model vertical axis. Look from body, it is multistage the combination of the cylinder of different diameter. Assume with the section plane that crosses axes countershaft undertakes analyse cut, analyse cuts outline to be the close broken line of one regulation, the axis can regard broken line as to circle axes to rotate the turn coming back that a week forms. This broken line that close also calls axial feature outline. The outline feature that decides an axis basically has 3 gist element: 1) type feature, the appearance of a flight of stairs of token axis, basically go up by the axis of the spare parts cooperate property, assemble recipe of ordinal, outfit to decide to place, if the graph is shown 4 times; 2) measure feature, namely the length of the diameter of shaft part and each shaft part. The diameter of shaft part with formula of diameter of the smallest axis: Graph 4 gear axis assembles draft plan to pursue afore-mentioned diagnostic element basises the influence degree of its and axial structure, can differentiate first grade: Type feature is one class, measure feature is 2 class, craft feature is 3 class. In actual programming, outline feature of the axis is assured finally by the acme of axial outline broken line, these acme namely the diagnostic dot of axial outline. The coordinate that the feature nods is by the design parameter is decided, often cannot input all parameter directly sometimes, in needing to designing a process, according to computation the result gives out interactively, first grade decided the order that diagnostic parameter inputs. 4 axes design flow block diagram to be based on above analysis, we wove the axis designs a program, graph the 5 flow block diagram that design for reducer gear axis. Flow all used dialog box form each times medium, the program falls in VisualC++ environment, compile via debugging the person is defeated to concern design parameter interactively all right by AutoCAD command after passing, the part drawing that automatic scale gives an axis (ichnography) three-dimensional perhaps graph. Graph graph of 5 programs block diagram pursues 5 designs example article basis program block diagram, the work out gives ObjectARX application order, to one sheet axis of high speed of class gear reducer undertook designing, particular operation is as follows. 5.
1 design parameter is defeated by person power P1=5kW, rotate speed N1=540r/min, denticulation teeth of a cogwheel counts Z1=22, mn=4 of method extent modulus, helix angle (dextral) 06' of β =8 ° , d1=88 of pitch circle diameter.
89mm, facewidth B4=70mm, round of wide B1=70mm is taken on the axis, the power that takes action to go up at the axis B1=1200N. 5.
2 moving preparation (1) undertakes process designing in Visual C++ above all, compile and link; (2) uses a program in ARX of the to load in AutoCAD; (The AutoCAD exterior command that 3) commands to the place in person application process is defeated directly on travel is defined in Command. 5.
3 moving results (1) program moves, shoot a dialog box of basic design parameter, the dialog box is here medium, the type of axis of make choice of, power that should lose a person and rotate speed; (2) designs a dialog box in subsequently axial structure (if the graph is shown 6 times) in, referenced draft of structure of its upper shaft, lose a person size of each fulcrum load, allowable curve stress; According to diameter of the smallest estimation place losing a person chooses each parameter of bearing. (3) program moves, in computational result dialog box, curved quadrature of the perpendicular turn moment that shows this axis place suffers, level curved quadrature, synthesis pursues and torque graph and final complex equivalent bend quadrature graph. (4) is sectional to critical point undertake intensity school nucleus, do not accord with intensity when results of some nucleus of school of dangerous and sectional intensity when the requirement, dot sheet picks a surname " new officer nucleus " , when all of result of nucleus of school of dangerous and sectional intensity accords with intensity to ask, dot sheet picks a surname " the structure is designed " . (This 5) program can be generated finally " ichnography " and " three-dimensional graph " , also can put these two kinds of figures on same Zhang Tu, facilitating design contrasts. 5 last words used this program to solve reducer successfully in the design " bottleneck " problem, the mechanical model of the reducer axis that put forward and structural feature, organic ground becomes design of the computation in making the axis is designed, structure and personal computer plot repeatedly an organic whole, realized the automation design of reducer. Carry out a proof, very main effect and sense are had in the development that above algorithm designs a program in axial design and reducer. CNC Milling