Integral impeller problem of processing technique application studies 5 axes

The 5 rods that the article uses an unit to have machining center, have the aid of is opposite at Mastercam X7 software the technology of key of 5 axes CNC Machining of integral type impeller undertakes study. The work of preparative work preparation of process designing of 1 automatic numerical control basically includes workpiece coordinate department, right knife dot and those who change knife spot is affirmatory, workpiece coordinate was at 0 o'clock it is process designing at 0 o'clock. In machining process designing, keep consistent definitely with design radical to make craft fiducial. The difficult point that impeller machines is main body is the following now at 3 o'clock: (1) whole impeller included 6 blade, the space of blade photograph adjacent is narrow, the cutting tool when treatment is mixed easily of the lamina that is machined and photograph adjacent blade happening interference; (2) lamina is thin wall structure, and can extend range of twist straight grain to be not, appearance photograph contrast is more complex; (3) paraboloid and φ the join of the surface on the cylinder of 96 is not simple circular arc join, have one " below sunken " part, have 6 ° included angle with X direction, also need to use treatment of 5 axes linkage to finish. Because the treatment of the spare parts wants to involve 5 axes treatment, because this needs a future life of software of CAD/CAM of have the aid of to become numerical control program, this literary grace is finished with Mastercam X7 software. The 5 axes that choose an unit to deserve to have system of Heidenhain TNC530 numerical control from some on the treatment facilities of impeller machining center, this machine tool can achieve linkage of axis of X, Y, Z, A, C5, specific working journey parameter is: X axis 730mm 560mm of axis of fore-and-aft, Y is transverse; Z axis 560mm hangs down to, a axis (workbench swings) - 120 ° of 110 ° ～ , c axis (workbench rotates) 360 ° . Can see from these parameter this machine tool can be competent the task that integral impeller machines. The CNC Machining function of 2 MasterCAM and application 2.

The geometrical model that the geometry of 1 spare parts 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, 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, can satisfy the need of CNC Machining again; When building a model, should come according to the real measure of the spare parts scale, in order to assure the validity of the coordinate of cutting tool method that computation generates; Can machine those who differ 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. 2.

After the imitate CNC Machining of 2 spare partses installs good cutting tool to machine method, the part that uses MasterCAM system to offer machines imitate function, can watch the process that cutting machines, 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.

3 generate numerical control to dictate code and program are transmitted through computer simulation CNC Machining, affirm when according with effective treatment to ask, with respect to the postposition that can use MasterCAM processing program generates NCI file or code of NC numerical control, 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, the requirement that can accord with place to use numerical control device is like after postposition handles classics of generated code of NC numerical control to be revised appropriately, can export numerical control equipment, undertake CNC Machining is used. 3 treatment process asks according to the dimension of the spare parts, the good stuff that chooses a diameter to be 76mm for 100mm height serves as semifinished product, divide the following working procedure to undertake machining. Working procedure one: Apply 3 claw to place face of lower end of the makings that run a club, use φ the main surplus that the hard alloy of 12 establishs the end on makings of club of milling cutter purify. Use Mastercam X7 in the treatment of this one working procedure " high speed curved surface is machined " means, this kind of means is used establish milling cutter to press wait for high area a milling of a ground, the height between layer and layer is 2mm, treatment efficiency is taller. In this one working procedure S of main shaft rotate speed can be set for 6000r/min, feed speed F3000mm/min, get after treatment " terraced fields step " appearance. Working procedure 2: The share that receives on one process " terraced fields step " mill is dropped, make curved surface nears academic curved surface. Still use φ in the treatment of this one working procedure of 12 establish milling cutter, but basically use the side edge that establishs milling cutter to undertake machining, and relatively rotate speed of main shaft of on one working procedure keeps changeless, 1000mm/min of feed speed instead, use Mastercam X7 " the 5 axes side the edge are machined " means undertakes machining, end up with " round stage " appearance. Working procedure 3: Treatment paraboloid and φ the join face of the surface on the cylinder of 96, this join face is not simple circular arc transfer, have one " below sunken " part, have 6 ° included angle with X direction. Need uses 5 axes linkage to machine ability to achieve dimension to ask. Angle of axis of the A when treatment maintains basically in 84 ° , undertake according to machining need small canzonet is rectified, cooperate X, Y, Z and C axis to undertake linkage is machined. The knife of head of hard alloy ball that needs to use φ 8R4 when treatment, use Masteream X7 " the gradual change of two curves " means undertakes machining. Option of this treatment means is located in " cutter track " / " much axis cutter track " in cascade menu, the relevant parameter setting of specific treatment is in " much axis cutter track -- between two curves gradual change " the setting in the dialog box. Crucial a few steps undertake demonstrative below: (1) " cutting means " have in the setting " editor curve " column should choose two cento route. The first group should choose paraboloid, φ of the 2nd group of choices the surface on the cylinder of 96. (2) " cutting tool axial is controlled " medium " output format " should choose 5 axes, "Pitch part way " set for 10 ° , "Direction of list horn cutting " set for 90 ° . Except above a few paces need to have special setting, other and OK choose acquiescent value. Working procedure 4: Undertake blade rough machining, this one working procedure needs 5 axes linkage to undertake machining, the ball head knife of φ 8R4 still is used in treatment, apply Mastercam X7 " much axis cutter track " medium " blade expert " undertake machining, the relevant parameter of specific treatment is in " much axis cutter track -- blade expert " the setting in the dialog box. A few crucial parameter install as follows: "Cutting means " of module " machine means " anthology for rough machining, "Sort means " choose " two-way, by in front the predestined relationship begins " the efficiency that machines in order to rise: Be in " definition component " in module " blade " the lamina that chooses two-phase adjacent, "Hub " the intermediate area of the two-phase adjacent lamina that chooses firm pitch on, and install " section amount " for 6. Other parameter can choose acquiesce, can give a program to finish rough machining. Working procedure 5: The finish machining of parabola curved surface of blade coping area, here needs common 3 axes linkage to be able to come true only. Use Mastercam X7 " cutter track " - " curved surface finish machining " - " streamline is machined " a future life completes treatment into the program, the cutting tool that uses here chooses the ball head knife of φ 8R4, main shaft rotate speed is taken for 6000r/min feed speed for 3000mm/min. Working procedure 6: Have blade precision work, in Mastercam X7 " much axis cutter track " in choice " curved surface is hypostatic " nod anthology " Swaff Milling " . In corresponding dialog box the setting machines parameter. Crucial parameter installs as follows: "Cutting means " of module " cutting curved surface " choice lamina flank, "Bottom curved surface " the hub between lamina of choice two-phase adjacent; "Curved surface public errand " in set cutting public errand is 0.

1, the largest space is 0.

2. Other parameter can choose acquiesce, can give a program to complete the treatment of this line working procedure. Working procedure 7: Have the precision work of hub, the processes an order method of this line working procedure and working procedure 4 adoption methods are basic all the time, need to be in only " cutting means " of module " treatment means " process 4 medium rough machining change " essence of life builds hub " can. Complete the treatment of impeller spare parts finally through above measure. Measure the radian of lamina of this spare parts through 3 coordinate measuring instrument, all satisfy formulary requirement. Author: Mo Jiahui CNC Milling