CN102049703A - Space coordinate transformation method suitable for turning-milling machining of parts with complex structures - Google Patents

Abstract

In recent years, with the increasing requirements of precision machineries, instruments and meters, aerospaces and other high-tech fields to the function of use of products, large numbers of mechanical parts with complex structures and function integration are emerged; the turning-milling machining based on a turning-milling machining center is an effective technical way for realizing the precision machining of parts with complex structures; and the problem of restricting the panning of the processing process results from the complex spatial position relationship between a cutter and a workpiece during the turning-milling machining process. The invention relates to a space coordinate transformation method suitable for turning-milling machining of parts with complex structures. The homogeneous coordinate transformation matrix is built by using a space rectangular coordinate transformation method based on the functional configuration of a turning-milling machining machine tool and the spatial structure characteristics of the parts with the complex structures, and the spatial position relationship between a cutter and a turning-milling workpiece is established, so that the coordinate transformation method from a machine tool coordinate system to a workpiece coordinate system is determined. The method can provide guidance and basis for the generation of the cutter location file after turning-milling machining and the post-processing of the NC program.

Description

A kind of space coordinate transformation method of labyrinth part turnning and milling processing

1, technical field

The present invention relates to a kind of space coordinate transformation method that is applicable to the processing of labyrinth part turnning and milling, by setting up the spatial pose relation between cutter and the workpiece, the cutter location file generation and rearmounted processing of NC program that can be turnning and milling processing provide method to instruct and foundation.

2, background technology

In recent years, along with high-tech areas such as precision optical machinery, instrument and meter, Aero-Space for improving constantly that product function of use and physical dimension require, a large amount of complex structures, the integrated machine components of function have appearred.As clockwork part, instrument and meter part, micro hydraulic and pneumatic element, miniature bearing part, micro-injection moulding mould, microtool electrode etc.Because the demand of this type of part is very big, require the part processing precision height, interchangeability is good, with short production cycle, processing cost is low.

In recent years, on the basis of traditional numerically controlled lathe and turning center, the milling-lathe machining center that increases functional configuration such as C axle calibration, Y-axis motion, power knife rest or milling electricity main shaft and grow up occurs in a large number, becomes the important manufacturing equipment of a class that solves this type of labyrinth part high accuracy processing.In " high-grade, digitally controlled machine tools with basis make equipment " scientific and technological great special project, be listed in the important development direction based on the turnning and milling Compositions of metal-working machines of turning machine with based on the car Compositions of metal-working machines that mills of milling machine.

Have unique principal advantage based on the turnning and milling process technology of milling-lathe machining center for efficient, the high accuracy processing of medium scale part: car, mill, major part such as brill or whole manufacturing procedure finish under a clamping condition, the locating information that can effectively avoid repeated clamping to cause is lost, thereby reaches the purpose that guarantees part processing precision, reduces lathe and anchor clamps, the carrying of avoiding inter process and storage, shortening process-cycle and working area; Be aided with automatic feed mechanism, can realize that also automation, unmanned produce continuously.

3, summary of the invention

For space structure complicated mechanical part, machining feature comprises multiple versions such as the surface of revolution, end face, step surface, thin-walled, groove, hole, relates generally to multiple machining modes such as facing, cylindrical turning, vertical milling are cut, drilling.Utilize traditional lathe or milling machine, workpiece need be carried out multiple clamping on different lathes, not only working (machining) efficiency is low, and because resetting causes machining accuracy to be difficult to guarantee.Therefore, the space structure characteristics of this type of part have determined that its processing technology suits to finish under a clamping condition.

The application is at the functional configuration of the spatial structure characteristic and the milling-lathe machining center of medium scale part, utilize the rectangular coordinate system in space transform method to make up the homogeneous coordinate transformation matrix, set up the spatial pose relation between cutter and the turnning and milling workpiece, thereby determine by the coordinate transformation method of lathe coordinate system to workpiece coordinate system.

4, description of drawings

Accompanying drawing is the space coordinate transformation schematic diagram of turnning and milling processing.Among the figure, O _wX _wY _wZ _wBe workpiece coordinate system, O _bX _bY _bZ _bBe milling-lathe machining center bed piece workpiece coordinate system, O _CX _CY _CZ _CBe milling-lathe machining center C axle calibration coordinate system, O _BX _BY _BZ _BBe milling-lathe machining center turntable revolution coordinate system, O _TxX _TxY _TxZ _Tx, O _TyX _TyY _TyZ _TyAnd O _TzX _TzY _TzZ _TzBe respectively milling-lathe machining center X, Y, Z axle stage coordinates system.

5, the specific embodiment

According to the functional configuration and the homogeneous coordinate transformation of milling-lathe machining center, set up the generating tool axis vector and the relation of the space coordinates between the workpiece coordinate system of milling cutter, lathe tool:

^wA _m＝ ^wA _C ^CA _b ^bA _Tz ^TzA _Tx ^TxA _B ^BA _Ty ^TyA _m

＝Trans(L _w，C，x，L _w，C，y，L _w，C，z)Rot(nwC，φ _nwC)×Trans(0，0，P _z)×Trans(P _x，0，0) (1)

×Trans(L _Tx，B，x，L _Tx，B，y，L _Tx，B，z)Rot(nTxB，φ _nTxB)×Trans(0，P _y，0)

^wA _t＝ ^wA _C ^CA _b ^bA _Tz ^TzA _Tx ^TxA _t

(2)

＝Trans(L _w，C，x，L _w，C，y，L _w，C，z)Rot(nwC，φ _nwC)×Trans(0，0，P _z)×Trans(P _x，0，0)

According to the coordinate space transformation matrix shown in formula (1) and the formula (2), the generating tool axis vector and the position vector that draw milling cutter, lathe tool are respectively:

$\left[\begin{array}{cc}{t}_{\max }^w& r_{\mathrm{mp}}^w\\ 0& 1\end{array}\right]={}^{w}A_m\left[\begin{array}{cc}{t}_{\mathrm{ax}}^m& r_p^m\\ 0& 1\end{array}\right]---\left(3\right)$

$\left[\begin{array}{cc}{t}_{\mathrm{tax}}^w& r_{\mathrm{tp}}^w\\ 0& 1\end{array}\right]={}^{w}A_t\left[\begin{array}{cc}{t}_{\mathrm{ax}}^t& r_p^t\\ 0& 1\end{array}\right]---\left(4\right)$

Computing by generating tool axis vector and position vector matrix and finding the solution, thus generating tool axis vector and the position vector of cutter spacing track under workpiece coordinate system is converted to machine coordinates and corresponding angle of revolution.

Claims (3)

1. The application relates to a kind of space coordinate transformation method of labyrinth part turnning and milling processing, and its technical characterictic mainly comprises:

   1. at the functional configuration of turnning and milling machining tool and the spatial structure characteristic of labyrinth part, utilize the rectangular coordinate system in space transform method to make up the homogeneous coordinate transformation matrix, set up the spatial pose relation between cutter and the turnning and milling workpiece.
2. 2. lathe coordinate system is realized by following steps to the coordinate transformation method of workpiece coordinate system:

   (1) sets up generating tool axis vector in work table rotation and the cutter shaft swing turnning and milling interlocked numerical controlled processing and the transfer algorithm between the rotational angle;

   (2) set up the evolution method of cutter location between workpiece coordinate system and work coordinate system.
3. 3. the space coordinate transformation method of the application's proposition is mainly used in the cutter location file generation and the rearmounted processing of NC program of labyrinth part turnning and milling processing.

Images