Injection Moulding - Revision history

DT Online at 11:22, 15 November 2016

2016-11-15T11:22:42Z

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	=====Description=====		=====Description=====

	[https://en.wikipedia.org/wiki/Injection_moulding '''Injection Moulding'''] is the most commonly used manufacturing process for the production of a great variety ~~plastic~~ products and components ''(inc. parts for plastics model kits for example)''		[https://en.wikipedia.org/wiki/Injection_moulding '''Injection Moulding'''] is the most commonly used manufacturing process for the production of a great variety plastics products and components ''(inc. parts for plastics model kits for example)''
	[[File:Principe moulage injection polymere.svg\|300px\|right]]		[[File:Principe moulage injection polymere.svg\|300px\|right]]


	In industry, plastics granules are drawn into an [https://en.wikipedia.org/wiki/Injection_molding_machine '''Injection Moulder'''] cylinder, or barrel, via a rotating screw to a point where they are heated and melted. The screw then operates as a piston and forces the melted ~~plastic~~ into a mould to create the products as shown:		In industry, plastics granules are drawn into an [https://en.wikipedia.org/wiki/Injection_molding_machine '''Injection Moulder'''] cylinder, or barrel, via a rotating screw to a point where they are heated and melted. The screw then operates as a piston and forces the melted plastics into a mould to create the products as shown:

	# Reciprocating screw;		# Reciprocating screw;
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	=====Modelling Injection Moulding=====		=====Modelling Injection Moulding=====

	The key principles of injection moulding to be demonstrated using a '''[[Hot Melt Glues\|Glue Gun]]''' and simply constructed moulds made from MDF or a plastics material such as '''Tufset [https://en.wikipedia.org/wiki/Polyurethane Polyurethane''']. This ~~plastic~~ machines well and can withstand the temperatures involved in the process. In either case, provision needs to be made to ensure the design of the finished product will release from the mould and, in addition, the mould may need coating with a realease agent ''(e.g. using [https://en.wikipedia.org/wiki/Silicone_grease '''Silicone Grease'''] spray or by heavily shading over the entire mould surface with very soft pencils to get a [https://en.wikipedia.org/wiki/Graphite '''Graphite'''] coating)''.		The key principles of injection moulding to be demonstrated using a '''[[Hot Melt Glues\|Glue Gun]]''' and simply constructed moulds made from MDF or a plastics material such as '''Tufset [https://en.wikipedia.org/wiki/Polyurethane Polyurethane''']. This plastics machines well and can withstand the temperatures involved in the process. In either case, provision needs to be made to ensure the design of the finished product will release from the mould and, in addition, the mould may need coating with a realease agent ''(e.g. using [https://en.wikipedia.org/wiki/Silicone_grease '''Silicone Grease'''] spray or by heavily shading over the entire mould surface with very soft pencils to get a [https://en.wikipedia.org/wiki/Graphite '''Graphite'''] coating)''.
	[[File:InjectionMouldBillet.png\|200px\|right]]		[[File:InjectionMouldBillet.png\|200px\|right]]
	[[File:InjectionMouldLimitations.png\|100px\|right]]		[[File:InjectionMouldLimitations.png\|100px\|right]]

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	[[File:~~Plastic-model-F18~~.png \|~~350px~~\|right]]		[[File:Mold cavity.png\|300px\|right]]
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	[[Category:Skills and Processes]]		[[Category:Skills and Processes]]
			[[Category:Working Plastics]]

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			[[File:Plastic-model-F18.png \|350px\|right]]
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	=====Description=====		=====Description=====

	[https://en.wikipedia.org/wiki/Injection_moulding '''Injection Moulding'''] is the most commonly used manufacturing process for the production of a great variety plastic products and components.		[https://en.wikipedia.org/wiki/Injection_moulding '''Injection Moulding'''] is the most commonly used manufacturing process for the production of a great variety plastic products and components ''(inc. parts for plastics model kits for example)''
	[[File:Principe moulage injection polymere.svg\|300px\|right]]		[[File:Principe moulage injection polymere.svg\|300px\|right]]

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2016-07-06T08:18:43Z

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			__TOC__


			=====Description=====

	[https://en.wikipedia.org/wiki/Injection_moulding '''Injection Moulding'''] is the most commonly used manufacturing process for the production of a great variety plastic products and components.		[https://en.wikipedia.org/wiki/Injection_moulding '''Injection Moulding'''] is the most commonly used manufacturing process for the production of a great variety plastic products and components.
	[[File:Principe moulage injection polymere.svg\|300px\|right]]		[[File:Principe moulage injection polymere.svg\|300px\|right]]
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	As a consequence, most injection moulded products can be identified by the presence of a small ''‘pip’'' or [https://en.wikipedia.org/wiki/Sprue_%28manufacturing%29 '''sprue'''] where the melted plastics entered the mould.		As a consequence, most injection moulded products can be identified by the presence of a small ''‘pip’'' or [https://en.wikipedia.org/wiki/Sprue_%28manufacturing%29 '''sprue'''] where the melted plastics entered the mould.


			=====Modelling Injection Moulding=====

	The key principles of injection moulding to be demonstrated using a '''[[Hot Melt Glues\|Glue Gun]]''' and simply constructed moulds made from MDF or a plastics material such as '''Tufset [https://en.wikipedia.org/wiki/Polyurethane Polyurethane''']. This plastic machines well and can withstand the temperatures involved in the process. In either case, provision needs to be made to ensure the design of the finished product will release from the mould and, in addition, the mould may need coating with a realease agent ''(e.g. using [https://en.wikipedia.org/wiki/Silicone_grease '''Silicone Grease'''] spray or by heavily shading over the entire mould surface with very soft pencils to get a [https://en.wikipedia.org/wiki/Graphite '''Graphite'''] coating)''.		The key principles of injection moulding to be demonstrated using a '''[[Hot Melt Glues\|Glue Gun]]''' and simply constructed moulds made from MDF or a plastics material such as '''Tufset [https://en.wikipedia.org/wiki/Polyurethane Polyurethane''']. This plastic machines well and can withstand the temperatures involved in the process. In either case, provision needs to be made to ensure the design of the finished product will release from the mould and, in addition, the mould may need coating with a realease agent ''(e.g. using [https://en.wikipedia.org/wiki/Silicone_grease '''Silicone Grease'''] spray or by heavily shading over the entire mould surface with very soft pencils to get a [https://en.wikipedia.org/wiki/Graphite '''Graphite'''] coating)''.
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	In practice, the width of passage which can be cut is limited by the smallest tool available on the '''[[CNC]]''' machine, in this case 2mm diameter. You should be aware that the '''[[CNC]]''' machine cannot cut sharp internal corners - the diameter of the radius in the corner again matches that of the smallest tool. Sharp external corners, however, are possible.		In practice, the width of passage which can be cut is limited by the smallest tool available on the '''[[CNC]]''' machine, in this case 2mm diameter. You should be aware that the '''[[CNC]]''' machine cannot cut sharp internal corners - the diameter of the radius in the corner again matches that of the smallest tool. Sharp external corners, however, are possible.

			----
	<span style="color: red">'''Safety Point!'''		<span style="color: red">'''Safety Point!'''
	Working with hot plastics is always hazardous. Avoid fumes, wear personal protection and ensure the mould is clamped firmly together to prevent any leakage.		Working with hot plastics is always hazardous. Avoid fumes, wear personal protection and ensure the mould is clamped firmly together to prevent any leakage.
	</span>		</span>
	----		----

			{{Injection Moulding Buyers Guide}}


	[[Category:Skills and Processes]]		[[Category:Skills and Processes]]

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	As an example, the billet shown to make the mould ''(uncut material we start with)'' is 100mm wide, 50mm high and 10mm deep. It has 6mm diameter mounting holes along the centreline 82mm apart to allow it quickly to be mounted on a CNC machine and any other injection moulding equipment.		As an example, the billet shown to make the mould ''(uncut material we start with)'' is 100mm wide, 50mm high and 10mm deep. It has 6mm diameter mounting holes along the centreline 82mm apart to allow it quickly to be mounted on a '''[[CNC]]''' machine and any other injection moulding equipment.


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	In practice, the width of passage which can be cut is limited by the smallest tool available on the CNC machine, in this case 2mm diameter. You should be aware that the CNC machine cannot cut sharp internal corners - the diameter of the radius in the corner again matches that of the smallest tool. Sharp external corners, however, are possible.		In practice, the width of passage which can be cut is limited by the smallest tool available on the '''[[CNC]]''' machine, in this case 2mm diameter. You should be aware that the '''[[CNC]]''' machine cannot cut sharp internal corners - the diameter of the radius in the corner again matches that of the smallest tool. Sharp external corners, however, are possible.

DT Online at 11:21, 7 June 2015

2015-06-07T11:21:57Z

← Older revision		Revision as of 11:21, 7 June 2015
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	[[Category:Skills and Processes]]		[[Category:Skills and Processes]]
	~~[[Category:Tools and Equipment]]~~

DT Online at 15:32, 6 June 2015

2015-06-06T15:32:05Z

← Older revision		Revision as of 15:32, 6 June 2015
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	# Mould.		# Mould.

	As a consequence, most injection moulded products can be identified by the presence of a small ''~~pip~~'' or sprue where the melted plastics entered the mould.		As a consequence, most injection moulded products can be identified by the presence of a small ''‘pip’'' or [https://en.wikipedia.org/wiki/Sprue_%28manufacturing%29 '''sprue'''] where the melted plastics entered the mould.

DT Online: Added Safety Point

2015-06-06T15:27:32Z

Added Safety Point

← Older revision		Revision as of 15:27, 6 June 2015
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	In practice, the width of passage which can be cut is limited by the smallest tool available on the CNC machine, in this case 2mm diameter. You should be aware that the CNC machine cannot cut sharp internal corners - the diameter of the radius in the corner again matches that of the smallest tool. Sharp external corners, however, are possible.		In practice, the width of passage which can be cut is limited by the smallest tool available on the CNC machine, in this case 2mm diameter. You should be aware that the CNC machine cannot cut sharp internal corners - the diameter of the radius in the corner again matches that of the smallest tool. Sharp external corners, however, are possible.


			<span style="color: red">'''Safety Point!'''
			Working with hot plastics is always hazardous. Avoid fumes, wear personal protection and ensure the mould is clamped firmly together to prevent any leakage.
			</span>
			----


	[[Category:Skills and Processes]]		[[Category:Skills and Processes]]
	[[Category:Tools and Equipment]]		[[Category:Tools and Equipment]]

DT Online: Created Article

2015-06-06T15:19:44Z

Created Article

New page

[https://en.wikipedia.org/wiki/Injection_moulding '''Injection Moulding'''] is the most commonly used manufacturing process for the production of a great variety plastic products and components.
[[File:Principe moulage injection polymere.svg|300px|right]]

In industry, plastics granules are drawn into an [https://en.wikipedia.org/wiki/Injection_molding_machine '''Injection Moulder'''] cylinder, or barrel, via a rotating screw to a point where they are heated and melted. The screw then operates as a piston and forces the melted plastic into a mould to create the products as shown:

# Reciprocating screw;
# Hopper;
# Granules;
# Barrel;
# Heaters;
# Mould.

As a consequence, most injection moulded products can be identified by the presence of a small ''pip'' or sprue where the melted plastics entered the mould.

The key principles of injection moulding to be demonstrated using a '''[[Hot Melt Glues|Glue Gun]]''' and simply constructed moulds made from MDF or a plastics material such as '''Tufset [https://en.wikipedia.org/wiki/Polyurethane Polyurethane''']. This plastic machines well and can withstand the temperatures involved in the process. In either case, provision needs to be made to ensure the design of the finished product will release from the mould and, in addition, the mould may need coating with a realease agent ''(e.g. using [https://en.wikipedia.org/wiki/Silicone_grease '''Silicone Grease'''] spray or by heavily shading over the entire mould surface with very soft pencils to get a [https://en.wikipedia.org/wiki/Graphite '''Graphite'''] coating)''.
[[File:InjectionMouldBillet.png|200px|right]]
[[File:InjectionMouldLimitations.png|100px|right]]
[[File:SimpleInjectionMould.png|200px|right]]

As an example, the billet shown to make the mould ''(uncut material we start with)'' is 100mm wide, 50mm high and 10mm deep. It has 6mm diameter mounting holes along the centreline 82mm apart to allow it quickly to be mounted on a CNC machine and any other injection moulding equipment.

Glue enters the mould as shown in the diagram, and air escapes through a breather hole. The design must allow glue to flow easily to all areas and allow hot air to escape through the breather. The design should not go too close to the mounting holes, as the cutting tool might foul on the bolts which are holding the workpiece to the milling machine. There should be no narrow passages which would constrict the flow of the glue.

In practice, the width of passage which can be cut is limited by the smallest tool available on the CNC machine, in this case 2mm diameter. You should be aware that the CNC machine cannot cut sharp internal corners - the diameter of the radius in the corner again matches that of the smallest tool. Sharp external corners, however, are possible.

[[Category:Skills and Processes]]
[[Category:Tools and Equipment]]