INJECTION MOULDING

1. INJECTION MOULDING
ABHISHEK DOBHAL
Me 8th Semester
Roll No. :- FEJB13ME13
JBKP,FARIDABAD
Email :- abhishekdobhal76@gmail.com

2. What Is Injection Moulding?
 Injection moulding is a manufacturing
process for producing parts by injecting
material into a mould. Injection moulding can
be performed with a host of materials mainly
including metals, glasses, elastomers,
confections, and most commonly thermoplastic
and thermosetting polymers. Material for the
part is fed into a heated barrel, mixed, and
forced into a mould cavity, where it cools and
hardens to the configuration of the cavity.

3. Injection Moulding Machine

4. Main Components Of Injection
Moulding Machine
 Clamping unit
 Injection unit
 Drive unit
 Mould
 Hydraulic system
 Control system
 Hopper
 Heaters
 Cooling channels

5. Injection Moulding Process -
Resources
 Material
 Machine
 Mould
 Manpower

6. Most Commonly Used Materials
 PVC
 ABS(Acrylonitrile Butadiene Styrene)
 Polypropylene
 Polystyrene
 HDPE( High density poly ethylene)
 LDPE(Low density poly ethylene)
 Rubber Thermoplastic
 Epoxy

7. Injection Moulding Process
 Material preparation
 Feeding into hopper
 Injection
 Mould holding and cooling
 Ejection

8. Injection Moulding Machine
Process
 Material granules are fed into hopper then
melted down in barrel which is surrounded by
the heaters.

9. Injection Moulding Machine
Process
 Melted material is injected into mould cavity
and mold is held under pressure until the
material cools and hardens.

10. Injection Moulding Machine
Process
 Once the material hardens, the mold is opened
and the component is ejected by runner plate.

11. Injection Moulding Machine
Process
 And the process can be repeated.

12. Injection Moulding Machine
Process

13. Mould
 Moulds are the common terms used to describe
the tool used to produce components in moulding.
 Moulds are constructed from hardened steel, pre-
hardened steel, aluminium, beryllium-copper alloy.
 In general, steel moulds cost more to construct,
but their longer lifespan will offset the higher initial
cost over a higher number of parts made before
wearing out.
 The moulds can be manufactured either by CNC
machining or by using electrical discharge
machining processes.

14. Mould Design
 The mould consists of two primary
components, the injection mould (A plate) and
the ejector mould (B plate).

15. Mould Design Consideration
 Shrinkage allowance: Depends on shrinkage
property of material core and cavity size.
 Cooling circuit: In order to reduce the cycle
time, water circulates through holes drilled in
both the core and cavity plates.
 Ejection gap: The gap between the ejector
plate face and core back plate face should hold
dimension within the core. It must allow
component to be fully removed from the mold.

16. Mould Design Consideration
 Mold polishing : The core, cavity, runner and
sprue should have good surface finish and
should be polished along material flow
direction.
 Mold filling : The gate should be placed such
that the component is filled from the thicker
section to thinner section.
 Draft: Required in both the core and cavity for
easy ejection of the finished component.

17. Mould Storage
 Manufacturers go to great lengths to protect
custom moulds due to their high average
costs.
 The perfect temperature and humidity level is
maintained to ensure the longest possible
lifespan for each custom mould.
 Custom moulds such as those used for rubber
injection moulding are stored in temperature
and humidity controlled enviornments to
prevent warping.

18. Mould Cooling
 Constant mold temperature for uniform quality
 Reduced cycle time for productivity
 Improved surface finish without defects
 Long mold life
 Avoiding warpage by uniform mold surface
temperature (warpage caused by nonuniform
cooling)

19. Mould Cooling

20. Moulding Defects
 Blister
 Flash
 Burn marks
 Warping
 Weld lines
 Colour streaks
 Voids

21. Manpower
 To set up process
 To monitor process and troubleshoot
 To operate machine

22. Injection Moulding Used For
 Plastic Injection Moulding
 Rubber injection Moulding
 Metal Injection Moulding

23. Plastic Injection Moulding
 It is a manufacturing process for producing
components by injecting polymer material into
a mould.
 Thermoplastic and Thermosetting plastic
material are used.
 Thermoplastic materials are reusable.

24. Plastic Injection Moulding

25. Plastic Injection Moulding
Applications
 Writing instruments components ( pen barrel,
cap, bush etc)
 Computer Electronics
 Automative Components
 Aerospace Components
 Electronic Components
 Toys etc.

26. Rubber Injection Moulding
 Injection molds can make many rubber
components. It makes valve steam seals, oil
seals for engines, telecommunication items
etc.

27. Metal injection moulding
• Injection molds can stamp out small to large
items. It can stamp out automobile parts from
spark plugs and floor pans to ball bearings. It
also can stamp out items like TV hangers and
knitting needles.

28. Advantages Of Injection
Moulding
 Fast production.
 Low labour costs.
 Design flexibility.
 High-output production.
 Multiple materials can be used at the same time.
 Can be used to produce very small parts.
 Leaves little post-production scrap.
 Ability to include inserts.
 Good colour control.
 Good product consistency.
 Reduced requirements for finishing.
 Good dimensional control.

29. Disadvantages Of Injection
Moulding
 High initial tooling and machinery cost.
 Part design restrictions.
 Small runs of parts can be costly

30. Applications Of Injection
Moulding
 Injection moulding is used to create many
things such as Cups, Containers, tools,
Mechanical parts (Including gears).
 Injection moulding is the most common
modern method of manufacturing parts. It is
ideal for producing high volumes of the same
object.

31. THANK YOU