Machine tool of 1 foreword numerical control and machining center use cutting tool (cutting tool of abbreviation numerical control) develop in abroad very fast, breed norms already formed series. The pace is later since the research development that our country logarithm controls cutting tool, the development of numerical control cutting tool and production make the weak point of industry of our country tool, of numerical control cutting tool lag behind to already made an impact homebred one of main obstacles that produce effect adequately with machine tool of entrance numerical control. At present the means of cutting tool of foreign design numerical control basically is some designs a result or already passed through be being called directly local revise and form new breed or norms. And domestic company (include the first automobile factory of Chinese) be in design of numerical control cutting tool is mostly it is AutoCAD) software platform to go up to have seesaw pattern plot by design personnel more with CAD(in business. Use very hard as a result of seesaw pattern plot already some design results, labor strength is great, design efficiency is low, satisfy actual production need hard. Accordingly, research develops technology of advanced CAD/CAM of numerical control cutting tool, very necessary to improving design of numerical control cutting tool, production quality and efficiency. In the development process of CAD technology, the occurrence that parameter changes a technology is fundamental revolution. This technology is core with restraining modelling, allow a project to design personnel to realize the modification to designing a result with the means of dimension drive, special agree with the seriation products plan with similar structure. The article is with numerical control boring cutter exemple, study parameter changes the implementation way of the design and method. The design method of cutting tool of other numerical control is as similar as its. The product model of boring cutter of 2 numerical control realizes the parameter of numerical control boring cutter to change a design to be on the computer, build appropriate product model very crucial. The product of numerical control boring cutter should include device of clamp of bit, arbor, razor blade to wait in the model. Be like arbor to more complex part, it is the implementation of facilitating model and management, can decompose its further for ministry of the head, lever two geometry body. In the design, cutting tool component all is described with the form of geometrical appearance. Graph the product model block diagram that 1 amount to charges boring tool. By the graph 1 visible, make boring tool the geometrical body of each part is comprised by market of element of structural tie, graph and parameter collect. Graph element market is the basic geometry element that makes geometrical system, wait like dot, line segment, circular arc, polygon. To improve the moving efficiency of software, use more close polygon will define geometrical body, in order to reduce the amount of graph element. The structure restrains the structure that is used at demarcate geometry body, if photograph subtense of the rectangle is mutual edge of adjacent of parallel, photograph is mutual and perpendicular; Parameter collect is used at determining the size of geometrical body, if rectangular edge is long, round (arc) radius. Because photograph adjacent pursues,element or the plan that have common position tie or directional tie in the space should have common parameter market between element, shun a plan to reduce data to be mixed redundantly appear to go all out inconsequently between element add up to a phenomenon, constructed total parameter collect, the parameter market that defines each geometry body is the subclass of total parameter collect, sky of be mixed blame is like between each subclass, express to abut relation or positional direction relation exist between them. Graph block diagram of model of product of boring cutter of 1 numerical control pursues the parameter of 3 geometry body turns sketch map of arbor of 2 boring cutter modelling by the graph 1 visible, realizing the parameter of geometrical body to spend modelling and affirmatory parameter part is the crucial step of the design. Once these two measure are finished, the design of whole boring cutter was finished basically. The parameter that geometrical form discusses above all below turns model. To show whole molding process, to in an attempt to shows geometrical graph 2 times to be exemple undertake discussion. Graph 2a installs the vertical view of boring cutter arbor of square razor blade to use means of pressing plate clamp, graph 2b is arbor head appearance, graph 2c is figure of arbor lever department. The figure of arbor head geometry that shows to graph 2b place, market of its graph element includes Ⅱ of element of bit chamfer graph, bolt the skeleton map outside Ⅰ of element of graph of chamfer of Kong Tu element, pressing plate and head element. Parameter changes design course is the course that leaves affirmatory feature to choose the place in condition of contented and certain tie. To the skeleton map outside the head in graph 2b element, dot of P0 of tie of structure of design lieutenant general, horizontal P0P3, P0P1 ⊥ P0P3 is fixed, regard drive as the parameter that its structure changes Kr, A, B, the parameter that regards drive as its size variation L, M, B (the restriction that width B accepts arbor width, belong to go all out add up to tie) . After element decides the skeleton map outside the head, according to bit dimension and the assembly of its and head the position can decide Ⅱ of element of bit chamfer graph, the relative position that reachs its and Ⅱ of element of bit chamfer graph according to pressing plate dimension next asks to decide bolt aperture pursues element and Ⅰ of element of graph of pressing plate chamfer. The key that the feature in definite plan 2b nods is affirmatory P2 dot, if decided P2 nods the coordinate that nods at P0 relatively (the L in pursueing namely, M is worth) , criterion on one hand element of Kong Tu of Ⅱ of element of bit chamfer graph, bolt and Ⅰ of element of graph of pressing plate chamfer are decided, on the other hand P3, P4 and P5, P1 also is decided subsequently. P6 dot is the centre of a circle that the consideration machines craft sex and the milling of the design lets knife circular arc, its position is decided really as Ⅱ of element of bit chamfer graph and decide. Graph 3 it is the sketch map of head of boring cutter arbor that is used at computational P2 to nod vertical view coordinate, see by the graph, p2 dot and P of dot of point of a knife are concerned. The place that P chooses is asked to decide by cutting, bit ply H is given value. Accordingly, after the installation position of bit is firm, the D value in the graph already decided. According to foregone D value, H is worth the size with Kr of tool cutting edge angle, can decide the dimensional coordinate that P2 nods. Graph the algorithm that bat around decides to P2 nods coordinate below sketch map of head of arbor of 3 boring cutter. For the coordinate that computational P2 nods, the local coordinate that builds coincide of two coordinate origin is (note: Go to the lavatory for computation, of reference axis direction choose the reference axis way that ties with coordinate with cutting tool computation abhorrent) O-XYZ and O-XqYqZq, among them O-XYZ is fastened for the umbriferous coordinate of boring cutter graph, and O-XqYqZq establishs advanced knife range, the reference axis correspondence that the coordinate that uses when face of the knife before its reference axis and treatment fastens is parallel (3) seeing a picture. Accordingly, following concerns have between two coordinate department: O-XYZ coordinate the department circles X axis corner coming back to spend) of the horn before Gp(cuts deep way, make Y axis and Yq gross ril load close, circle Yq axis corner coming back to spend Y again, get coordinate fastens O-XqYqZq namely. The horn before Y horn and Gf(feed direction) and cut deep before the relation of horny Gp is calculated to simplify for Tgy=tggf Cosgp 1 process, coordinate of the X that makes P0 is nodded, Y is 0, accession is nodded at O lower part (it is facilitating observation, graph 3 in the seat that fastens to coordinate undertook translation) , the Z coordinate that makes P is nodded at the same time is 0. O-XqYqZq is fastened in coordinate in, p2(X2q, y2q, z2q) and P(Xq, yq, the relation of Zq) is (the dot that set P2 is located in on bit diagonal, otherwise, the included angle between D and bit hemline can be obtained through computation) after X2q=Xq-Dsin(Kt-p/4)Y2q=Yq-Dsin(Kt-p/4)Z2q=Zq-h 2 gets P2 dot fasten the coordinate in O-XqYqZq in coordinate, can calculate its umbriferous in vertical view coordinate (X, y, z) , coordinate of among them X, Y is worth value of the M in be equal to graph 2b, L. According to coordinate the relation between department O-XYZ and O-XqYqZq and coordinate rotate formulary, attainable (X, y, z) and (X2q, y2q, the relation between Z2q) is X=X2qcosy+(Y2qsingp+Z2qcosgp)sinyY=Y2qcosgp-Z2qsingpZ=(Y2qsingp+Z2qcosgp)cosy-X2qsiny 3 by type (1) ～ (3) can be calculated the coordinate of dot giving P2 (X, y, z) . Among them coordinate of X, Y is used at defining vertical view, z coordinate is used at scale advocate view. After P2 point is certain, the method is narrated to decide other feature is nodded before pressing, can finish graph 2b place to show the basic outline model of head of boring cutter arbor. Same, the vertical view of arbor of whole boring cutter, advocate auxiliary view all can press view, side view and other similar the design process of afore-mentioned arbor heads undertakes designing. Design medium computational quantity actually to decrease, wove algorithmic program, the user needs to input relevant parameter only, the parameter that can realize numerical control cutting tool changes a design. The sort of cutting tool of administrative numerical control of 4 parameter collect is various, parameter amount is huge. Use for convenient user, we used open database interconnection (ODBC) technology, the means memory that the database hangs outside using is commonly used parameter. In traditional database domain, database application process is to show in specific database management systematic support falls normally, with specific inside the program that language of the inquiry that set pattern develops. Program of this kind of database often needs a giant database to manage systematic support, taller to the requirement of soft, hardware of the user. ODBC technology offerred a kind of new database application program to realize a way, it established a group of standards, offerred process of a group of high level application to call what interface is based on trends to link a library with to run support. The applied program that develops with a group of such interface can use standard function and structured inquiry language to undertake operating to the database, and need not care data source to come from why to plant database management system, operations of all database ground floor can be finished by corresponding ODBC driver. In ODBC technology, ODBC driver manages implement it is the bridge between ODBC application process and data source and ligament. ODBC driver manages implement, if the relation between source of ODBC driver, data and ODBC application process pursues 4 are shown. The record memory in using ODBC technology to regard a database as the boring cutter parameter of different sort rises, the user can retrieve a database according to what designing the sort of boring cutter, get corresponding parameter collect or have dimension drive plot directly or undertake local the design that new product realizes after revising, as a result of need not one by one inputs parameter, make design process very convenient, quick. Technology of graph 4 ODBC applies block diagram the coding system of 5 boring cutter retrieves to facilitate, data logging used standard coding system. Encode represents bit clamp way the 1st times, the 2nd represents bit form, the 3rd represents tool cutting edge angle, the 4th represents the part after bit, the 5th represents cutting way, the 6th, height of point of a knife of two 7 delegates, the 8th represents boring cutter code name, boring cutter of the 9th delegate installs means, the 11st, code of dimension of razor blade of two 12 delegates. For example: Razor blade of clamp of CSFNR25CA-12 delegate pressing plate, square, tool cutting edge angle is 0 ° of 90 ° , the horn after bit, right cut, side of means of installation of 25mm of height of point of a knife, standard, razor blade is long for 12. The boring cutter of 70mm. To the new product that the user designs after the classics on original design foundation is revised, when encode undertook be adjustmented accordingly on the base that follows afore-mentioned regulations. For example: The instead of tool cutting edge angle of admiral of pattern plate of boring cutter design that the user is CSFNR25CA-12 in encode grows instead by the side of 93 ° , razor blade 9.
525mm, the encode of new boring tool is CSUNR20CA-09. The parameter of numerical control cutting tool of new development of 6 programs moving frame changes design platform to allow an user to undertake standard design and the derive type that are based on standard design are designed. To facilitate data manages, built two databases: Standard database is used at depositing already some modular design data; Nonstandard the database is used at depositing the design data with new user. Corresponding ground offerred two designs interface, namely standard design interface and nonstandard design an interface. Specific design stage is as follows: Project code of affirmatory project code can use 3 kinds of methods surely really: ① direct input method: The user inputs the encode that designs cutting tool directly on design interface; ② item-by-item decides a way: After the project such as the horn after the user chooses direction of appearance of bit clamp means, razor blade, cutting, razor blade, the system decides boring cutter codes automatically; ③ list browses a law: The user passes the encode that offers on the interface to express, search place to require code with the means that browse. The boring tool that codes to make the user knows every are planted clearly place is represented is main form, the boring tool that provides correspondence of place of every kinds of encode in order to preview the form of the graph on the interface is main appearance. When what extraction design needs data to use list to browse a law to code certainly, the encode that designs an interface in the standard above all is browsed in list, if what require code nonexistent, enter nonstandard browse in the encode list that designs an interface, if what need encode to exist, doubleclick this encode with the mouse, move has after collecting data (4) ; If what require code nonexistent, have move (3) . Use other when two kinds of methods code certainly, can inquire to whether this encode exists in searching a database through encode. Inquire standard database above all, if this encode is nonexistent, inquire again nonstandard database, if this encode exists, move has after the system collects data automatically for the user namely (4) , if this encode is nonexistent, have move (3) . Modification parameter to the nonexistent encode in two databases, the user can choose the original products plan that devises product likeness with place to extract parameter through the encode list that offers on alternant interface, undertake local parameter is adjusted and new design is formed after revising. If get satisfactory result, after having code, stock nonstandard database. After plot obtains the input parameter of a need, the dot takes scale graph to command, the system undertakes automatically designing computation, after the drive dimension of cipher out graph can the assembly drawing that draw gives boring tool and part drawing, tag dimension, fill headline column and technical requirement, blueprint norms of the standard gives out in the meantime, form complete project blueprint finally. 7 epilogue use parameter to change the numerical control cutting tool that the technology develops to design platform to be able to improve design efficiency significantly, make design personnel to be liberated from inside heavy repeatability work, in using more energy in creativity to design the job. CNC Milling