Transfer simulators Principles of die manufacture .1 Classification of dies

Th e m ech an ism , seen in Fig. 4.1.23 , lift s t h e t o p d ie p arallel t o t h e lo w- er d ie, an d aft er a 180° t u rn p laces it n ext t o t h e lo wer d ie. Th e m ech a- n ism en su res t h at bo t h p art s o f t h e d ie are lift ed safely an d wit h co n - sist en t accu racy wit h o u t an y t ilt in g.

4.1.6 Transfer simulators

Tran sfer sim u lat o rs are u sed fo r t h e ad ju st m en t an d p re-set t in g o f p art - d ep en d en t t o o lin g o f t h e grip p er rails an d t h e vacu u m su ct io n cro ssbars o f large-p an el t ran sfer p resses cf. Fig. 4.4.29 an d 4.4.34 . Th e lo wer d ie an d t h e p art -d ep en d en t t o o lin g are in st alled in t h e sim u lat o r; p rio r t o p ro d u ct io n t h ese will be co u p led wit h t h e p erm an en t ly in st alled t ran s- fer co m p o n en t s o f t h e p ress Fig. 4.1.24 . Th e m o vem en t s o f t h e t ran sfer, p art an d d ie m u st be syn ch ro n ized in relat io n t o o n e an o t h er so t h at t h ere can be n o o verlap p in g at crit ical p o in t s an d co n seq u en t ly n o co llisio n bet ween t h e t ran sfer, t h e p art it self an d t h e d ie. Th u s, d at a o n grip p er an d su ct io n cu p p o sit io n s, t ran sp o rt p at h s, t ran sp o rt h eigh t , p art p o sit io n in g an d flo w d irect io n s is st o red in a p ro gram m e. Th is p ro gram m e is t ran sferred o n t o t h e p ro - d u ct io n lin e. Th e p o ssibilit y o f co llisio n s o f p art an d d ie, wh ich was alread y verified as p art o f t h e CAD d esign p ro cess, is ch ecked o u t in t h e sim u lat o r. Th e p rim ary t ask fo r t h e sim u lat o r is, h o wever, t h e m at ch in g o f t h e p art -d ep en d en t fixt u rin g t o t h e sh eet m et al p art . A t est is p er- 154 Sheet metal forming and blanking Fig. 4.1.23 Parallel lift mechanism Metal Forming Handbook Schuler c Springer-Verlag Berlin Heidelberg 1998 fo rm ed t o ascert ain wh et h er t h e p art is p o sit io n ed p recisely in it s u n i- versal st at io n an d in t h e d ie. In ad d it io n , t h e en ergy su p p ly an d co n t ro l syst em o f t h e t ran sfer rails are ch ecked fo r co rrect fu n ct io n in g. Mo d ern syst em s can also sim u lat e t h e ch an gin g o f p art -sp ecific t em p lat es u sed in t h e u n iversal st at io n . 155 Principles of die manufacture Fig. 4.1.24 Transfer simulator for a large-panel transfer press w ith crossbar transfer system Metal Forming Handbook Schuler c Springer-Verlag Berlin Heidelberg 1998 4 Sheet metal forming and blanking 4.2 Deep draw ing and stretch draw ing 4.2.1 Forming process