Horizontal CNC Form Gear Grinding Machine
 1.4     Peripherals
1.4.1  Hydraulics/Lubrication
·    Complete hydraulic system for lubrication, clamping, and tailstock stroke.
·    S-axis with oil mist lubrication.
·    Z, X-axes with grease lubrication.                    
·    C, A-axes with oil lubrication.
 
1.4.2  Coolant Filtration System
The  coolant  filtration system  cleans  used coolant  using paper filtration media  and includes the following:
·   Temperature controlled for grinding fluid utilizing a chiller–type oil cooler.
·    Filter capacity=120L/min.  
·    Multiple  circuit  coolant  chilling  equipment:  With automatic  temperature regulation for cooling oil.
·    Oil mist recovery and electrostatic air filter. 
 
1.5     Standard Machine Accessories
The  Model  #YK7340A CNC  Profile  (Form) Wheel  Gear  Grinding  Machine  is  used  for grinding precise,  special  cylindrical  gears  with  an  outside  diameter  of  less  than 400mm (15.75”). These  types  of  gears  are  more  commonly  used  in  the  automotive, rail transport, aviation  and  machine  tool  industries.    This  machine  is  especially  suitable  for  grinding high-speed gears and clusters with requirements for profile and lead modification, as well as special  fillet  requirements  for tip  and  root.  These  machines  can  also  be used  for  grinding components without involute forms as well, such as cycloid gears, precision splines and worm  workpieces.    Indeed,  the  YK7340  was  specially  developed  to  encompass  these  special  workpieces.


  
 The  working principle  of this  machine  is  form grinding.   The  profile  of the  grinding   wheel  is modified   via  on  an on-board wheel  dressing system utilizing a diamond dressing wheel to facilitate grinding of  the  orkpiece tooth    forms    precisely.  The movements  and operations  of the  machine are relatively  simple  and
straightforward  (especially when  compared  to generational-type grinding); but can be characterized by  tremely high machining accuracy and efficiency.   The model #YK7340 orients the workpiece horizontally between centers for maximum workpiece  design  flexibility.    This  design  philosophy  more  easily  allows  for
spline and worm gear forms. 
 The  Model  #YK73xx  Series  form  grinding  machine  designs  from  QC  American  are  known
for  their  remarkable  reliability,  thermal stability  and  they  are adaptable to  automation. 
Featuring  a  full  CNC-based control,  these  machines  are  capable  of  performing well  in a
variety of gear finishing applications, as well as being quite flexible where modifications are
concerned.    The #YK73xx  Series  feature  high  power  grinding  spindles,  standard  precision
components  utilized  from  around  the globe and  closed  loop  feedback  systems  for  high
geometrical and positioning accuracy. 
Main Characteristics
·    Compact machine design featuring a ribbed, one-piece cast iron bed.
·    Ergonomic  design  with  complete  machine  access  from the  ground  floor and through a well designed and completely lit enclosure.
·    The on-board automatic dressing cycle of the grinding wheel improves the uptime and efficiency of this machine tool.
·    Siemens 840D CNC Controls and Drives – controlling six (6) axes.
·    The  special  Human  Machine  Interface  (HMI) was  developed  by QC according to the  working characteristics  of North  American  gear processing.   Based  on  a conversational  programming protocol,
programming is  simplified  by entering workpiece  parameters  and relevant technical parameters as called out by the operator. 
 
Technical Data


 Grinding Wheel

Machine with Auxiliary Units




                                                 #YK7340 Machine Layout is Identical to Model #YK7332-A  
Base Machine
1.1     Assembly Groups
·    Machine  Base   of  ribbed  design, made  of  cast  iron. Installation on leveling/vibration isolation pads.
·    Column made of cast iron with slide guideway. 
·    Wheel Stock made of cast iron. Wheel stock radial in feed utilizes precision ball screw, powered directly by an AC servo motor.
·    CNC Dressing Device  Automatic  dressing  by an on-board diamond dresser.  The  dressing paths  are  generated by the  horizontal  and the  tangential  grinding slide movement.
·   Enclosure  (Full) Multiple  access  points  through enclosure  to key areas  of machine facilitates easy dresser, grinding wheel and workpiece changeovers.
 
1.2     Electrical Equipment
1.2.1  Power Supply
Operating voltage is 460/480 Volt/3Phase/60Hz.
 
1.2.2  SIEMENS 840D CNC Control
Operator Features
·    Operator station with 12” TFT color flat screen and control panel in front of the control cabinet. Integrated keyboard with a team of horizontal and vertical soft keys.
·    Hand-held operating panel for more convenient set-up of the machine.
·    The  machining program  uses  standard CNC conversational  programming language  fully developed by QC, and the  interface  program  uses  NUM standard MMI TOOL software. 340 Machine Layout is Identical to Model #YK7332-A 

 ·    German-Owned Siemens  service  is  out  of  New  York, USA.   QC American provides front-line service regardless.
 
Control Interface Features
·    Windows 2000 Operating System.
·    586MB Pentium processor.
·    30GB hard drive.
·    128M RAM.
·    56K modem.
·    Two USB Ports for archiving user and machine data or running peripherals.
·    3.5” floppy drive.
·    Parallel interface for connecting a printer.
·    Serial interface for common use.
·    Ethernet interface.
Service Functions
·    Integrated modem for remote diagnostics connection between QC computers.
·    Graphical display of processing data.
 
1.3     Software for Siemens 840D Control
This QC Developed software package enables the user to generate, edit and optimize grinding programs  and analyze  processing data  on the  control  of  the  machine  or a remote  PC. The  software  interface  is  identical  with the  machine  control  menu  and may even be used for rudimentary training purposes.
·   Gear  parameters  calculation  module  –  Input and  storage  of workpiece  data.    This  module  consists  of  a  conversational  interface  for geometrical parameter  data  entry, technical  parameters  and measuring parameters  to facilitate  computing of  standard gears, gears  with addendum  modification,
modified spur (helical) cylindrical gears.   Basic work piece data is recorded into a database for later editing or processing.

 modification.  This  module  serves  to gather data  in order to generate  the correct  wheel  profile  through an editable  series  of  dressing cycles  using the on-board dressing wheel system.   Based on data entered about the workpiece and special  requirements  on gears  to be  machined;  including profile, lead
modification and fillet curve parameters, the profile of the grinding wheel can be automatically computed to meet the task at hand.


 ·    Conversational  Control  Design.    The G code will be automatically created based on the gear processing and grinding parameters entered by the user.   In addition, the  customers  can even directly use  and upload straight  G  code  if desired.
·    Customer can add specific modifications to suit their applications.
 
1.3.1    Functions for Grinding of Worm and Spline Forms.
On-board  software  supports  these  two forms, along with  wheel  stock  and  grinding wheel  hangeovers.   Please see section 1.3.
. 

1.3.2   Axis Information
·    Six (6) CNC Axes
·    ‘X’-Axis. Radial movement of main wheelhead column relative to workpiece, 300,0mm  total  travel, with Linear guide  way. Powered directly by an AC servo motor and driven by ball screw.   Linear scale Type: LS486 Heidenhain; Resolution: .0001mm.
·    ‘Z’-Axis. Axial  movement  of  worktable  in workpiece  direction in length. 
650,0mm with Linear guide way. Powered directly by an AC servo motor and
driven     by     ball  screw.      Linear     scale  Type:  LS486       Heidenhain;
Resolution: .0001mm.
·    ‘A’-Axis. Rotary movement  of  the  grinding wheel  headstock, Type  and
resolution of rotary axis by Heidenhain RON785 @ .0001mm.
·    ‘C’-Axis. Rotary movement  of  workpiece  headstock.  Type  and resolution of
rotary axis by Heidenhain, RON785 @ .0001mm.  
·    ‘S1’-Axis. Rotation of grinding wheel.
·    ‘S2’-Axis. Rotation of diamond dressing wheel.