Term of numerical control process designing and series of standard

Affirmatory Z axis the machine tool to having main shaft, wait to regard Z axis as direction with direction of axes of machine tool main shaft like lathe, milling machine. To doing not have the machine tool of main shaft, be like planer, criterion with the workbench photograph with the workpiece that hold card perpendicular regard Z axis as direction point-blank. If the machine tool has a few main shaft, criterion the choice works with the machine tool among them the main shaft with mesa perpendicular photograph serves as main main shaft, determine Z axis direction with it. 2.

Axis of X of affirmatory X axis is located in commonly inside as parallel as workpiece installed surface horizontal. Drive the machine tool that workpiece rotates to machine tool main shaft, wait like lathe, grinder, it is inside horizontal make choice of is perpendicular it is X axis at the direction of workpiece axis of rotation, and the square that cutting tool is far from direction of main shaft axes to be X axis to. Drive the machine tool that cutting tool rotates to machine tool main shaft, become main shaft is a level, wait like boring machine of horizontal milling machine, horizontal, stipulate the person faces main shaft, left direction is main shaft of make choice of X axis square to; When main shaft it is upend when, wait like drilling machine of vertical milling machine, vertical, stipulate the person faces main shaft, direction is X axis square on the right side of main shaft of make choice of to. To the machine tool of derelict axis, be like planer, criterion direction of cutting of make choice of is X axis square to. 3.

Direction of axis of Y of affirmatory Y axis is OK basis already direction of axis of the Z of make choice of, X, by right hand rectangular coordinates the department decides. If the machine tool is divided,coordinate motion names X, Y, Z basically moves point-blank besides, still parallel moves at their coordinate, should name respectively for U, V, W. If still have the 3rd group of campaign, should name respectively for P, Q, R. If be in the first group to answer have a change of luck to move A, B and C while, still the 2nd group of circumgyrate move, can name wait for D or E. The format of address of block format word of CNC Machining program the machine program of a spare parts is comprise by a lot of block that write by formulary format. Every block is including all sorts of instructions and data, the process of a paragraph of treatment of it is corresponding spare parts. Familiar block pattern has solid methodize format, separator order form and word address pattern 3 kinds. And at present commonly used is word address format. If typical word address form pursues. The block format of CNC Machining program the serial number that the begin of every block is block, express with alphabetical N and 4 digit word; It is preparative function instruction commonly then, by alphabetical G and composition of two digit word, this is basic numerical control instruction; It is the target coordinate value that the machine tool moves after that, if use X, Y, Z to wait,assign athletic coordinate value; In craft sex instruction, f code is feed speed instruction, s code gives priority to axial rotate speed to dictate, t is injunction of cutting tool order, m code is auxiliary function instruction. LF ends a sign for the block in ISO standard (CR is in EIA standard, in system of certain numerical control, block end accord with uses a symbol " * " or " ; " express) . Block of program word 　 by a certain number of partial composition, departmental cent calls program word. Address code and data 　 each program word all is mixed by an English letter the several string composition from the back. English letter calls an address to pile up, ever since several string call data, this kind of form calls word address pattern. Format of address of word of 　 of characteristic of word address format comes with address code the meaning of demonstrate instruction data, because the program word amount in this block is alterable, the length of block namely alterable, accordingly, word address format also calls alterable block pattern. The advantage of word address format is the information readability that includes in block tall, facilitate artificial editor is revised, it is to use a kind of the most extensive form at present. Word address format explains for numerical control system program of executive CNC Machining offerred a kind of convenient way. Main program and block of name of program of subprogram construction main program set program date commonly with O; Set workpiece coordinate fastens instruction of block application G92 to build working coordinate department; Block of the preparation before treatment locates the cutting tool that finish quickly cut a point around, cooling fluid pump is started, set of main shaft rotate speed and start wait for setting job; Cutting block is the core of machine program, include cutting tool radius to amend the statement such as setting of setting, speed of interpolation, feed commonly; Systematic restoration includes the work such as the condition restoration of all settings in machine program, mechanical system restoration; Program end comes true commonly by M02 or M30. Construction of type of general machine program is like wrong place laying a plan to show. The subprogram is in the program, when the program share that some secures appears repeatedly, can regard a subprogram as them, store beforehand in memory, can simplify so machine program. Right go up the executive process that the graph reflected a subprogram to call. Above all, the subprogram can be called by the main program, also can call by other subprogram. Subprogram structure and general machine program are very similar, it is program end instruction is replaced with M99 only, be like: 0 (or: ) * of × of × of × × × ... ... M99* uses M98 instruction to call a subprogram, its block format is: M* of □ of □ of □ of 98 P □ , among them □ of □ □ □ is subprogram date. Injunction of order of numerical control of injunction of numerical control order includes to prepare instruction of M of functional G instruction, auxiliary function and craft statement (F, S, T) . The opposite motion contrail that prepares functional G instruction to use formulary cutting tool and work (dictate namely interpolation function) , a variety of treatment operations such as compensation of plane of department of machine tool coordinate, coordinate, cutting tool; The action that auxiliary function M dictates is implementation machine tool the control of all sorts of auxiliary movements, include stop since main shaft, stop since lube pump, stop since cooling fluid pump, the functional control such as machine program end; F instruction uses set feed rate; S instruction uses the rotate speed that appoints main shaft; T instruction uses set to machine uses cutting tool. Cut contact and in cutting contact curve to cut contact to machine a process in curved surface, the academic contact dot of the cutting tool in cutting process and workpiece curved surface is called cut contact. Cutting contact is change. From the point of geometric angle, the osculatory relation between cutting tool and workpiece curved surface all is point contact. The osculatory spot position of different cutting tool figure and workpiece is different, if pursue. In cutting contact curve to cut contact curve to show cutting tool is machining a process by the curve that cuts contact to form. Cutting contact curve is the main essential factor that makes cutting tool contrail, define OK and explicitly already go up in treatment curved surface, be like curved surface those who wait for parameter line, two curved surface hand in a line to wait, OK also concealed type definition, make its satisfy requirement of a few ties, if restrain cutting tool edge to guide,move a line to move, and guide those who use a line is umbriferous and OK definition cutting tool is in those who machine curved surface to go up to cut contact, still can define contrail of cutting tool center, cut contact curve to be defined by type of concealed of contrail of cutting tool center. This that is to say, cutting contact curve can be the real curve on curved surface, also can be the tie condition place to cutting contact is implicit " fictitious " curve. Knife dot data and knife of contrail of cutting tool motion dot data is the coordinate cost that each buy in showing accurate and affirmatory cutting tool is machining a process require. Generally speaking, cutting tool fastens medium exact position to be able to use cutting tool center and cutter shaft vector to have a description in workpiece coordinate, among them cutting tool center can be knife heart dot (the heart that be like a ball) , also can be dot of point of a knife. Contrail of cutting tool motion is to point to in machining a process by the knife the curve that dot motion place forms, music on-line still is including vector of a cutter shaft at each o'clock. To 2, 3 coordinate CNC Machining, contrail of cutting tool motion is general by cut contact curve to slant through cutting tool buy computation gets, computation deposits Yu Dao commonly as a result in the file. CNC Milling CNC Machining