THREE PLATE_MOULD EDUCATIONAL NTTF PPT.ppt

three plate mold

1. THREE PLATE MOULD/ MULTI
DAYLIGHT or UNDER FEED MOULD
NEED FOR THREE PLATE MOULD DESIGN : ---
1.AUTO DEGATING
2.TO RUN IN AUTOCYCLE
3.AVOIDS LARGE WITNESS MARK OF SPRUE
4.AVOIDS SECONDARY SPRUE CUTTING
5.AVOIDS IMBALANCE OF FORCES IN SINGLE CAVITY MOULD
6.AVOIDS DEFECTS WELD LINE AND SHORT SHOT
7.IMPROVES STRENGTH OF WELD LINES IN LARGE
COMPONENTS MOULDED IN SINGLE CAVITY WITH MULTIPLE
POINTS OF INJECTION
8.FEED SEPERATED FROM COMPONENTS BY TWO PARTING
SURFACE OPENINGS

2. SINGLE CAVITY
SPRUE GATED MOULD
LARGE AREA COMPONENT
SECONDARY SPRUE CUTTING
OPERATION
LARGE WITNESS MARK
CAVITY
SPRUE
GATE

3. CENTRE
OF CAVITY
AREA
MACHINE
CENTRE
SINGLE CAVITY EDGE
GATED MOULD
BECAUSE OF OFFSET
BETWEEN CAVITYC.L. AND
MACHINE C.L. IMBALANCE
IS SET
OFFSET

4. SLOTS IN
COMPONENT
CENTRAL
PIN PONT
GATE
THREE PLATE MOULD
SINGLE CAVITY
LARGE AREA COMPONENT
WITH CUT OUTS AT
EXTREMITIES FED BY
CENTRAL PIN POINT GATE
RESULTS IN WEAK
WELD LINES
WEAK
WELD LINES
formed

5. CYLINDRICAL COMPONENT FED BY AN EDGE GATE
–WELD LINE, CORE SHIFT & SHORT SHOT
Cylindrical Part
Edge Gated
Runner
Flow of Melt
Weld Line
formed

6. Three plate mold –closed condition

10. 3Plate mould in fully
closed Position
NOTE :-
a)Cavity plate locked
with Moving half
through Hook assy.
b)Dim. X -between
Head of Bolt & Hook
Vertical Face
X

11. I Parting
surface
opens’X’
RPCRCVCB TPSBBP

15. Cam guide
HookRoller Pin
Leaf Springs
Studs
Threaded Core
(loose insert)
Puller Pins
Sprue Bush
(Taper)
Runner Plate
Cavity Plate
Stopper Bracket
Ejector Plate
Rest Button
Guide Pillar
3 Plate Mould Alternate Design

16. I -Parting surface
Opens
Feed system pulled
to Runner plate
Moving Half moves
further
Stopper Bracket
pulls Runner plate
to Strip feed
systewm
Hook
Stopper Bracket
Cam Guide

17. Hook roller raised by
Cam surface ---

18. L2
L1 TPCV
10 mm
RP
L1 = sub spruelength + main spruelength + 10mm
L2 = CV+ L1 + RP + 10 + TP

20. Cam Guide
L
1
W
1
W
2
H
3
H
2
H
1
Some of the important dims. that actuate Locking &
Releasing of cavity plate with moving half
Cam Surface
L
2

21. Hook for Three Plate Mould
Roller Pin
Hole for
Fastening
Hook

22. Three plate Mold –Closed condition

23. Three plate Mold –Open condition

24. THREE PLATE MOULD –CLOSED ASSY.
Runner
plate
X
Cavity
plate
Swing
Hook Lock
Assy.
Stopper
Core insert
Core Plate
Stripper
Plate

25. MOULD OPENS ‘X’AT FIRST PARTING SURFACE
Feed System
Pulled to
moving cavity
plate back side
and the
Pin point Gate is
cut
X

26. Second Parting Surface Opens
Spring hook
Lock released
Feed Ejected
in First P.S.
Component carried
by
moving half

27. Stripper Ejection
COMPONENTS EJECTED

30. Three plate mould --Hook assembly
Hook
Housing
Fulcrum