The concept of CNC Machining process designing, method, principle, measure

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Process designing of handiwork of Width=500;" Border=0> manual process designing is each measure that point to program of CNC Machining of work out spare parts, pursue from the spare parts namely paper analysis, technology is decision-making, certain knife of treatment course and craft parameter, computation the orbit coordinate data, CNC Machining program that writes a part sheet till of the program examine, all by will finish artificially. Not quite complex to choosing a treatment or geometrical figure outline is machined, geometrical calculation is simpler, block is not much, manual process designing can come true. If the turning of axis of simple a flight of stairs is machined, do not need complex coordinate calculation commonly, often can pursue according to working procedure by technical personnel paper data, write CNC Machining program directly. But not be the complex part that forms by simple linear, circular arc to outline appearance, especially the space is complex curved surface spare parts, numeric computation is quite trival, workload is big, make mistake easily, and proofread very hard, using manual process designing is finished hard. <IMG Onclick=javascript:wIndow.

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Width=500;" Border=0> automatic process designing is automatic process designing is to use the computer to assist technology of numerical control process designing to come true, need a software of special numerical control process designing, the system of language process designing of all sorts of types that main component is software of process designing of contemporary numerical control to be given priority to with batch processing command mode and CAM of ／ of seesaw pattern CAD are compositive change process designing system. APT is tool of a kind of automatic process designing (Automatically Programmed Tool) abbreviation, the geometrical appearance that is pair of workpiece, cutting tool and cutting tool are close to the symbolic language at English one kind when wait for the place when having a definition to use at the motion of workpiece relatively. In design of hardware of basis of personnel of the process designing when process designing, with the form of APT language expression gives the entire content of treatment, input the spare parts machine program that writes with APT language again the computer, system of process designing of classics APT language compiles generation Dao Weiwen (CLDATA File) , after be being handled through postposition, build the course of the order of spare parts CNC Machining that numerical control system can accept, call APT language automatic process designing. Use APT language when automatic process designing, the computer (or process designing machine) replaced to program personnel to finish trival numeric computation to work, and leave out the workload that writes program sheet, can improve process designing efficiency consequently multiple to number decuple, solved the process designing difficult problem of a lot of inextricability complex parts in manual process designing at the same time. Compositive system of seesaw pattern CAD/CAM is automatic process designing is the commonly used method in contemporary CAD/CAM compositive system, when process designing process designing personnel uses a CAD above all (the function of spare parts modelling of CAD) or itself of software of automatic process designing, compose proposes a form of spare parts geometry, undertake to part drawing appearance craft is analysed next, machine plan certainly, the CAM that still needs to use software ever since (CAM) function, the choice of dosage of the formulate of program of the technology that finish, cutting, cutting tool reachs the set of its parameter, be calculated automatically and generate a knife orbit file, use postposition to handle a function to create the machine program that assigns numerical control system to use. Accordingly we call way of this kind of automatic process designing the graph is alternant type is automatic process designing. The system of automatic process designing that system of this kind of automatic process designing is a kind of CAD and CAM height union. Compositive the main characteristic that changes numerical control process designing: The geometrical design module that the geometrical appearance of the spare parts can use CAD/CAM compositive system in spare parts design phase has a definition below graphical interactive mode, show and revise, get the geometrical model of the spare parts finally. Process designing operation is to those who finish is in below the graphical interactive mode such as screen menu and command drive, have figure, intuitionistic and efficient wait for an advantage. The content of process designing of CNC Machining program and measure (one) <IMG Onclick=javascript:wIndow.

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The machine program with the proper content of process of process designing of Width=500;"> numerical control should make sure treatment gives the eligible work that accords with blueprint requirement not only, should make the function of numerical control machine tool gets rational application and sufficient play at the same time, in order to make numerical control machine tool works can safely, reliably, efficiently. The work out process of CNC Machining program is a more sophisticated technology decision-making process. Generally speaking, process of numerical control process designing basically includes: Processing of analytic hardware design, craft, maths processing, write program of numerical control of program sheet, input and program to examine, procedure of typical numerical control process designing is shown like plan institute. The content of process designing of CNC Machining program and measure (2) <IMG Onclick=javascript:wIndow.

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Craft of treatment of measure of process designing of Width=500;" Border=0> numerical control is decision-making before numerical control process designing, process designing member the function that should understand place of system of the norms that uses numerical control machine tool, function, numerical control to have and form of process designing statement. According to size of spare parts shape and its technology requirement, analyse the treatment craft of the spare parts, the machine tool with appropriate make choice of, cutting tool and clamping apparatus, affirmatory and logical spare parts machines order of situation of craft course, labor and cutting dosage to wait for craft parameter, these jobs and the work out procedure when general accuracy machine tool machines a spare parts are basic it is identical. 1.

Certain treatment program should consider the rationality that numerical control machine tool uses and economy right now, develop the function of numerical control machine tool adequately. 2.

The design of labour clamping apparatus and choose to answer the fixed position that special attention wants to complete work quickly and clamp process, in order to reduce auxiliary time. Use built up fixture, production prepares cycle weak point, clamping apparatus spare parts can be used repeatedly, economic effect is good. In addition, place should facilitate with clamping apparatus installation, facilitate the dimension between harmonious workpiece and department of machine tool coordinate concerns. 3.

The course taking a knife with logical choice chooses cutter track route reasonably to CNC Machining it is very important. Should consider the following aspects: (1) shortens as far as possible cutter track line, reduce empty travel taking a knife, improve manufacturing efficiency. (2) is reasonable select site removing a knife, cut nod and cut way, assure to cut a course smooth, without concussion. (3) assures to machine the requirement of the precision of the spare parts and exterior surface roughness. (4) assures to machine the security of the process, avert cutting tool and the interference that are not treatment face. (5) is helpful for simplifying numeric computation, reduce block amount and workload of work out program. 4.

The element that dosage of the process capability of the function of workpiece material, machine tool, type that processes working procedure, cutting and other and treatment concern the cutting tool basis with logical choice will choose cutting tool, include parameter of brand of the structural type of cutting tool, material, geometry. 5.

Affirmatory and reasonable cutting dosage must determine cutting dosage correctly in craft processing. Knife when orbit computation is writing NC program, the method taking a knife of the requirement according to course of craft of size of spare parts shape, treatment and definition, the coordinate of the contrail that in proper workpiece coordinate strung computational spare parts and cutting tool move relatively is worth, occupy in order to obtain knife digit, the coordinate such as the node of element of the centre of a circle of the start of element of such as geometry, terminal, circular arc, geometry or point of tangency is worth, still need to be calculated according to these data sometimes the coordinate value of contrail of cutting tool center, press numerical control system unit of the smallest set (like 0.

001mm) afore-mentioned coordinate the value is changed into corresponding digital amount, as the parameter of process designing. Before computational cutting tool machines orbit, origin of right choice process designing and workpiece coordinate department are all in all. Workpiece coordinate department is to point to when numerical control process designing, affirmatory on workpiece fiducial coordinate is, its origin also is CNC Machining is right knife dot. The choice principle that workpiece coordinate fastens is: (The workpiece coordinate department that 1) place chooses should make to program simple; (Origin of department of 2) workpiece coordinate should be chosen searching easily, facilitate in machining a process the position of the examination; (The machining error that 3) causes is small. Compensation of number of dosage of contrail of motion of work out or the treatment line that make basis of machine program detailed list make, cutting tool, cutting, cutting tool, cutting tool asks to reach auxiliary action, the instruction code that uses according to system of machine tool numerical control and block format ask, write or make detailed list of spare parts machine program, need to undertake the abecedarian is checked artificially, undertake iteration modification. Order input provides photoelectricity tape reader on inchoate numerical control machine tool, input equipment as machine program, accordingly, to large machine program, can make machine program punched tape, regard control as message medium. In recent years, a lot of numerical control machine tools use all sorts of as current as the computer programs such as technology of newsletter of disk, computer to input means, realize the input of machine program, accordingly, need to edit good machine program in the input on common computer only, can convey directly in the numerical control system of numerical control machine tool. Become when the procedure is simpler, in also can inputting numerical control system directly artificially through clavier. The machine program that desired result of validity of CNC Machining program weaves normally must be mixed through further desired result try cutting ability to be used at formal treatment. When discovery is wrong, should analyse wrong character and the account that its produce, or modification program is only, or adjust cutting tool to compensate dimension, till till what accord with blueprint regulation precision asks. If plan institute is shown,the computer assists the general principle of CNC Machining process designing. The form that process designing personnel will be reached to concern process to be able to identify with the computer by the geometrical graph of treatment spare parts above all inputs the computer, use the program of numerical control system inside the computer to undertake an interpreter to inputting information, form develop of the spare parts inside machine to attack data; Handle into travel craft next (if cutting tool chooses, walk along parameter of knife allocation, craft to choose to wait) the computation with contrail of cutting tool motion, generate a series of data of cutting tool position (the coordinate data that includes to walk along a knife to move every time and craft parameter) , this one process says to give priority to information processing (or before buy is handled) ; Mix according to NC code standard next the requirement that appoints drive of numerical control machine tool to control a system, will advocate the Dao Weiwen that gets after information processing changeover is NC code, this one process says handle for postposition. Through postposition processing can be outputted get used to some the program of spare parts CNC Machining that machine tool of specific numerical control asks (namely NC machine program) , this machine program can pass control medium (wait like tape, disk) or the control system that communication interface sends a machine tool. Whole processing process is in program of numerical control system (call a system software or compiler again) undertake below control. Program of processing of the buy before program of numerical control system includes and postposition processing program two big module. Every module is reached by much stature module again child processing program composition. The computer had this to cover processing process, whole process of ability identifying, changeover and processing, it is core part of the system. CNC Milling