MOLD MAKING

Document Sample
MOLD MAKING Powered By Docstoc
					                       MOLD MAKING
Moldmaking in 5 axis
                                                                       MOLD MAKING
Look Ahead



Look-ahead acceleration and deceleration across block boundaries

                v
                              G64 with look ahead
 F programmed

                              G64 without look ahead




                              G60




                    N1        N2       N3       N4     N5   N6     t




☺ Shorter machining time through optimum velocity control
                                                        MOLD MAKING
Interpolation based on NURBS


Univeral interpolator for all kinds of interpolations


   Linear
   Circle- and Helix
   Spline- and Polynominterpolation




☺ All functions in all types of interpolation
  (tool offsets, zero offsets, transformations, etc.)
                                                       MOLD MAKING
G01 Linear interpolation



Description of contour through straight lines



                                     Nominal contour




              Tollerance band



                           block 11 .... block n
                            block .... block n


☺ Common way of describing curved surfaces
                                                                         MOLD MAKING
CIP-interpolation


Description of contour through 3D arcs


     Z
                              Y
                                      Nominal contour

                                      Centre- point
                                                                 G17


             Tollerance band

             Starting-poind                               Endpoint
                                  block 11 .... block n
                                   block .... block n                X


☺ Higher machining speed through reduction in block processing time
                                                                  MOLD MAKING
Polynomial interpolation NURBS



Description of contour through polynoms




                                Nominal contour




             Tollerance band


              1. block                            2. block
               1. block                            2. block



☺ High path accuracy through continuous polynomial acceleration
☺ Higher performance through no division into linear blocks G01
                                                                          MOLD MAKING
Compressor



Online-conversion of G01-blocks into polynoms




     G01-blocks
      G01-blocks




                                                Polynoms
                                                 Polynoms



☺ Higher machining speed through internal reduction in block processing
  time
                                                                   MOLD MAKING
Interpolations


                                    Nominal contour




               Tollerance band




  IPO                  Syntax                         No, blocks
  Straight line        G01 X Y Z                      10 blocks
  CIP                  CIP X Y Z I1 I2 I3             5 blocks
  Polynomial           PO[X]=(...) PO[Y]=(...)        2 blocks
                                                                                                  MOLD MAKING
CAD/CAM interface
                                                                                 CNC 840D
                                                Partprogramm-                  CNC 840D
                                                                                 interpolator
                                                    Syntax                     interpolator

                                                G01
                                                S10000 F4500
                                                X2.001 Y5.012 Z3.00
                          G01-format               A10.224 B24.551
      CAD / CAM                                 X2.010 Y5.035 Z3.010
     CAD / CAM
        System                                     A10.243 B24.678
       System                                   X2.033 Y5.077 Z3.055       linear-
    (Postprocessor)
   (Postprocessor)                                 A10.259 B24.772           IPO
                                                ........
                                                (max. 5 axis)
                                                                           (G01)

                                                CIP
                                                S10000 F4500                             com-
            POLY-format            external     X2.456 Y6.456 Z6.456
                                                                           Circle-      pressor
                                                 I1=3.234 I2=7.477
                                   software       I3=7.113                  IPO
                                                X4.336 Y8.668 Z8.553
                                                 I1=4.001 I2=7.667
                                                                           (CIP)
                                                  I3=7.964
                                       Meta-    (max. 3 aaxis)
                                       Cut®

                                                POLY                      Polynomi
                                                S10000 F4500                 al
                                                  PO[X]=(1.03,3,4.66)       IPO
                                                  PO[Y]=(2.55,3.7,4.1)
                                       SPEED-     PO[Z]=(4.22,5.5,8.11)
                                                  PO[A]=(5.23,7,9.22)     (POLY)
                                        MILL
                                                  PO[B]=(2.33,8,0.12)
                                                  PL=3
                                                .......
                                                (max. 5 axis)
                                   MOLD MAKING
CAD-Systems with NURBS-interface




             hyperMILL
             hyperMILL
                       ®
                        ®




             CNC.IN
             CNC.IN
                                                                               MOLD MAKING
Blockcycletime


☺ Calculated block processing time: approx. 0.8 ms
  (program runtime: approx. 8 s for 10,000 NC blocks)

      Typical mold making machine with 3 geometry axes
      NC with Pentium Pro processor (NCU573.2) as of software release 5.2
      Part program with G01 blocks, chord length 1..2µm (sculptured surface)
      With active online compressor

Further reduction in block change times through:
      Polynomial interpolation
      CIP-interpolation


☺ Short machining times through fast block processing time

				
DOCUMENT INFO
Shared By:
Tags: hypermill
Stats:
views:28
posted:3/29/2011
language:English
pages:11