Method of auto scanning and scraping a work piece for a hard rail

Abstract

A method of auto scanning and scraping a work piece for a hard rail has a preparing step, a scanning step, a detecting step, an auto-scraping step and an analyzing step. The preparing step comprises preparing an auto scanning and scraping apparatus with a multi-axis machine tool, a control computer, an auto-scraping device and a position detector. The scanning step comprises scanning the surface of the work piece to read the roughness value and transporting the data to the control computer. The detecting step comprises forming a 3D-appearance drawing of the work piece and detecting the 3D-appearance drawing with multiple detection steps. The auto-scraping step comprises scraping the surface of the work piece by the auto-scraping device. The analyzing step comprises detecting the 3D-appearance drawing of the work piece that has been scraped with the preceding detection steps and scraping the work piece to meet the preceding detection steps.

1 . A method of auto scanning and scraping a work piece for a hard rail comprising:
 a preparing step comprising:
 preparing an auto scanning and scraping apparatus with a multi-axis machine tool, a control computer, an auto-scraping device and a position detector; 
 defining a spindle along the Z-axis of the multi-axis machine tool; 
 mounting a moving mount having a top below the spindle moved relative to the spindle by the multi-axis machine tool; 
 mounting a turntable rotatably on the top of the moving mount below the spindle; 
 putting a work piece with a surface for the hard rail on the turntable; 
 connecting the control computer electrically to the moving mount of the multi-axis machine tool; 
 mounting an auto-scraping device securely on the spindle above the moving mount with an extending mount and a scraping tool; 
 mounting a position detector on a sidewall of the scraping tool and connecting the position detector electrically to the control computer to scan the surface of the work piece; and 
 adjusting height of the spindle relative to the turntable to allow valid measurement range of the position detector to cover the a whole surface of the work piece; 
   a scanning step comprising:
 moving the turntable relative to the spindle to allow the position detector to move along a route to scan the surface of the work piece; 
 setting an initial scan point and a measurement range in the control computer and compensating the location of position detector in the Z-axis direction to eliminate an offset mistake produced by vibration of the turntable during the scanning step; and 
 scanning the surface of the work piece along the setting route to read roughness value of the work piece and transmitting data to the control computer after correcting offset mistakes of the turntable by the control computer; 
   a detecting step comprising:
 forming a 3D-appearance drawing of the work piece by the scanning data in the control computer; 
 detecting the 3D-appearance drawing of the work piece by multiple detection steps; 
 transmitting coordinates of the 3D-appearance drawing of the work piece that fail to meet requirements of the preceding detection steps and planning a scraping route according to the coordinates; and 
 translating the scraping route into a NC code and transmitting the NC code to the multi-axis machine tool to control movement of the multi-axis machine tool; 
   an auto-scraping step comprising:
 scraping the surface of the work piece by the auto-scraping device, moved and controlled by the multi-axis machine tool; and 
   an analyzing step comprising:
 scanning the surface of the work piece after the auto-scraping step; 
 forming a 3D-appearance drawing by the scanning data in the control computer and detecting the 3D-appearance drawing of the work piece that has been scraped with the preceding detection steps; and 
 scraping the surface of the work piece by the auto-scraping device if the 3D-appearance drawing of the work piece fails to meet requirements of the preceding detection steps to meet requirements of the preceding detection steps. 
   
     
     
         2 . The method as claimed in  claim 1 , wherein in the preparing step:
 mounting the extending mount with a bottom side securely mounted on a bottom of the spindle;   mounting the scraping tool with a sidewall movably on the bottom side of the extending mount;   mounting the position detector on the sidewall of the scraping tool; and   contacting a scanning terminal of the position detector with the surface of the work piece to scan the work piece.   
     
     
         3 . The method as claimed in  claim 2 , wherein in the scanning step, the scanning terminal of the position detector is moved along an S-shaped route to scan the surface of the work piece and the interval between the adjacent paths of the S-shaped route is a constant value. 
     
     
         4 . The method as claimed in  claim 3 , wherein in the detecting step, the preceding detection steps include the contacting ratio per square inch, the numbers of the high points per square inch, the height distributed mode, the straightness of the surface and the corner shape of the 3D-appearance drawing of the work piece. 
     
     
         5 . The method as claimed in  claim 4 , wherein in the scraping step, the surface of the work piece is scraped to confirm the actual scraping depth of the scraping tool before scraping the surface of the work piece and correcting the scraping process according to the actual scraping depth of the scraping tool. 
     
     
         6 . The method as claimed in  claim 1 , wherein in the scraping step, the surface of the work piece is scraped to confirm the actual scraping depth of the scraping tool before scraping the surface of the work piece and correcting the scraping process according to the actual scraping depth of the scraping tool. 
     
     
         7 . The method as claimed in  claim 2 , wherein in the detecting step, the preceding detection steps include contacting ratio per square inch, numbers of the high points per square inch, height distributed mode, straightness of the surface and corner shape of the 3D-appearance drawing of the work piece. 
     
     
         8 . The method as claimed in  claim 3 , wherein in the detecting step, the preceding detection steps include contacting ratio per square inch, numbers of the high points per square inch, height distributed mode, straightness of the surface and corner shape of the 3D-appearance drawing of the work piece.