The database is the foundation of  making out heat  treatment  process.  Generally, heat treatment database  is  pided  into  materials  database  and process database.  It is an inexorable trend  to predict the property  by  materials and  process.  Although  it is difficult  to establish a property database,  it is nec- essary to establish  the database by  a series of  tests. The materials database includes  steel grades,  chemi- cal  compositions, properties  and  home and abroad grades parallel  tables.  The process database includes heat treatment  criterions  ,  classes,  heat preservation time  and  cooling velocity. Based  on the  database, heat treatment  process  can be created  by inferring from rules. 2.4  Tool and equipment for heat treatment After heat  treatment  process  is determined, tool and equipment CAD/CAE  system transfers the information about design  and manufacture  to the numerical  control device.  Through rapid tooling  prototype,  the reliability  of  tool and the clamping  apparatus  can  be  judged.  The  whole  procedure  is  transferred by  network,  in  which  there  is  no  man-madinterference. 3  Key Technique 3.1  Coupling of  temperature, microstructure, stress and property Heat  treatment  procedure is a procedure of  temperature-microstructure-stress interaction.  The  threfactors  can  all influence  the  property  (see  Fig. 4).During heating and cooling,  hot  stress and transfor-mation  will come  into  being  when microstructurechanges.  Transformation  temperature-microstructure  and temperature-microstructure-and stress- property  interact on each other.  Research on the  interaction  of  the  four  factors  has  been  greatly  developed,  but the  universal  mathematic  model  has  nobeen built.  Many models fit the test nicely,  but  thecannot be put into practice. Difficulties with most omodels  are solved in analytic solution,  and numericamethod is employed  so  that  the  inaccuracy  of  calculation exists. Even  so,  comparing experience method with quali tative  analysis,  heat  treatment  simulation  by com- puter makes  great progress. 3.2 The development procedure  for  die  and  mould involves  design, manufacture,  heat  treatment,  as- sembly,  maintenance  and  so  on.  They  should  have own  database  and  model.  They  are  in  series  with each  other  by  the  entity-relation model"'.  Through establishing and  employing dynamic  inference mech- anism,  the aim of  optimizing design  can be achieved. The relation between product model  and other mod- els was built.  The product model will  change in case the cell model changes.  In fact,  it belongs  to the re- lation of  data with  die  and mould.  After  heat treat- ment model  is  integrated  into  the  system,  it is  no more an  isolated unit but a member which is close  to other models  in  the  system.  After searching,  calcu- lating  and  reasoning  from  the  heat  treatment  data- base,  procedure  for  heat  treatment,  which  is  re- stricted by  geometric model, manufacture model for die  and  mould  and  by  cost and  property,  is  ob- tained.  If  the  restriction is disobeyed,  the  system will  send out the  interpretative warning. All design cells are connected by communication network. Establishment and  integration of models 3.3  Management and harmony among members The complexity of  die and mould  requires close- ly  cooperating among item groups.  Because each member  is  short  of  global  consideration for  die  and mould  development, they  need  to  be managed and harmonized.  Firstly,  each  item  group  should  define its own  control  condition  and  resource  requested, and learn  of  the  request  of  up-and-down  working procedure  in  order  to  avoid  conflict.  Secondly,  de- velopment  plan  should be made  out  and  monitor mechanism should be established.  The  obstruction can  be  duly excluded  in case  the development  is hin- dered. [3]  模具热处理并行设计英文文献和中文翻译(3):http://www.751com.cn/fanyi/lunwen_29374.html