Mould design checklist

Below is a simple injection mold design checklist which is an essential tool for us, including a vast number of details in injection mold making, making sure that all components are fit, the dimensions work together and that the mold will ultimately function as it should. We recommend every client also confirm the 3D mold drawings according to some similar checklists.

     - clamping situation

NG

OK

NO NEED

Remark

1

Max. Mold height        

2

mold installation height        

3

overlaid clamping plate        

4

clamping slots- holes        

5

locating  ring diameter        

6

centering ring MS        

7

nozzle installation depth        

8

heating band and cabel slot for injection machine enough        

9

ejector pin according to customer’s requirement.        

10

label (hot channel,cooling schema,company label)        

11

transport bridge/tie bar – Transport thread – Transport protection        

12

insulation sheets   MS   /   FS        

13

hot channel connector on the top of non operator side        

14

cooling connector don’t interrupt clamping process        
   - mold assembly        

16

sufficient mold plate thickness        

17

countour with insert        

18

countour in moldbase        

19

the angle of wedge is 5 degree by milling designed        

20

nozzel radius  R mm        

21

ejector plate guidance        

22

support pillars in the ejector room.        

23

enough ejection stroke        

24

return pin        

25

locking for side pressure        

26

slide locking on the mold plate is one unit        

27

angular pin diameter enough        

28

ejector system switch        

29

support legs        

30

pressure plate for parting surface        

31

parting line on the mold plate?(if mold on the plate )        

32

Hydraulic connector according to customer’s requirement.        
   - inserts and slide        

33

Material according to Specification        

34

the mount  and position  of ejector pins/ fixed..        

35

venting slots or inserts        

36

set limit switch for ejector, which under the slide        

37

label according to customer’s standard (demountable) cavity label        

38

enough  slide stroke        

39

slide fixture. (ball guiding-slide lock)        

40

lifter wearing blocks are made of Bronze / Steel        

41

insert cores for ribs and hooks        

42

area/shape of the  parting line        

43

long core or inserts  locked  from the opposite direction.        

44

parting line free milled enough.        

45

guide pin is longer than angular pin        

46

oil slot on slide and angle slide        

47

angle slide lower than the mold surface.(no scratchs on the surface)        

48

if use angle lifter, ejector plate intensity is enough( thicken the ejector plate?)        

49

pressure plate for slider sink into mold plate 3-5mm.(if not ,add dowel pin)        

50

for angle slider,pressure plate and wearing plate is one inte        

51

slider extend into  cavity,  assemble surface 3°-5°degree diving        

52

use graphite as wearing plate for big slider.        

53

slider easy to assemble and disassemble.        

54

material stick slider and angle lifer.        

55

parts can drop automaticly or need to use robot when there is anglelifer        

56

angle lifter has fixing plate( in the middle)        

57

processing basic point and sealing even surface for angle lifter,        
     - gate system        

58

cold runner length and gate bar diameter.        

59

hot nozzel        

60

hot channel        

61

needle valve        

62

brand according to  customer’s requirement        

63

direct connection        

64

tunnel gate (baffle) with cold channel spread.        

65

enough tunnel diameter        

66

bent gate        

67

auxiliary tunnel gating        

68

spheriacl calotte  (沉头)        

69

gate cross-section   round / trapezium        

70

changeable gate inserts        

71

gates / parts fall freely        

72

sprue puller (undercut)        

73

Is the Position of injection point right          

74

monifold as short as possible        

75

balanced flow path        
      - Tempering        

76

connectors according to customer’s requirement.        

77

 the number of cooling cycles.        

78

diameter of  cooling holes are big enough        

79

mold plate temper        

80

insert  temper        

81

slide temper        

82

hot nozzel off cold runner        

83

cooling connector   (under/opposite the operator side)        

84

calculate injection cycle time : ………………..  realizable        

85

cooling in/outlet mark start form A plate to B Plate from bottom to top        

86

mini.distance between 2 cooling connectors is 25mm        

87

mini.distance between cooling hole ,screw hole, ejetor and ejector hole 4mm        

88

same distance between cooling line and products in ejector and nozzle side        

89

cooling line as short as possible        
Some more check points

NG

OK

NO NEED

Remark

1

products  including shrinkage        

2

products mirror reflection        

3

guide pillar ,screw, support pillar, ejector guide bush and locating ring  same as drawing        

4

inserts dimension and depth no different from drawing .        

5

cooling system and ejector pin don’t interrupt each other        

6

cooling system and screw don’t interrupt each other        

7

cooling don’t interrupt insert        

8

O ring , screww and ejector pin don’ t interrupt each other        

9

cooling system and  screw holes for  lifting bar don’t interrupt each other        

10

side lock , cooling system and screw don’t interrupt each other        

11

lifting bar and junction box don’t interrupt each other        

12

lifteing bar and junciton box don’t interrupt each other        

13

limit switch , return pin and screw don’t interrupt each other        

14

ejector pins and angle lifer don’t interrupt eachother        

15

straight clamping slots  and locking unit screw don’t interrupt eachother        

16

ejector pins and support pillars don’t interrupt each other        

17

ejector sleeve and ejector rod don’t interrupt each other        

18

mark spring type clearly        

19

thick pillars for screw  and thick ribs cut material