Presentation on mould coating processes
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PRESENTATION ON MOULD COATING PROCESSES
SUBMITTED BY:-Aashish Chandel75134005
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CONTENTS INTRODUCTION MOULD COATING NEED OF MOULD COATING CHARCATERISTICS OF COATING MATERIAL GRAPHITE MOULD COATING VACUUM MOULD PROCESS WORKING ADVANTAGES AND DISAVANTAGES
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MOULD A hollow container used to give shape to molten
or hot liquid material when it cools and hardens.
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COATING A coating is a covering that is applied to the surface of an
object, usually referred to as the substrate. The purpose of applying the coating may be decorative, functional, or both.
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MOULD COATING The Mould Coating (MC) process is a specially
developed process where plastic components are coated in the tool via so-called negative moulds during production.
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NEED MOULD COATING
DEMOULDING CLEANING EFFORT
TO INCREASE LIFETIME
DECREASE RFURBISHING EFFORT
FOR EVEN SURFACE
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CHARCTERISTICS OF COATING MATERIAL
GOOD ADHESION TO SUBSTRATE
PROVIDE PROTECTION
AGAINST PENETRATION
BE FAST IN DRYING
GOOD COVERING
POWER
MINIMIZE CORE
STRENGTH DEGREDATION
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GRAPHITE MOULD COATING
USED IN NON
FERROUS AND IRON
FOUNDARIES
NOT EASILY PENTRATED AND WET BY
MOLTEN METAL
CANNOT BE USED IN STEEL
BECAUSE CARBON CONTENT
IT IS FLAY TYPE ,
SILVERY WHITE IN
APPEARENCE
IT IS IN FINE POWDER
FORM FREE FROM GRIITY PARTICLES
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CONTENTS IN GRAPHITE COATING
ASH CONTENT 12% - 15%
VOLATILE MATTER 3% MAXIMUM
MOISTURE CONTENT 1% MAXIMUM
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CMS SPUNCOAT Graph coat S Graphdip S GW Spray
It is a water based graphitic coating.
Used as a die-release-agent in the centrifugal casting.
It is supplied in a ready-to-use form for application by spraying method.
It can readily be diluted with water if required to suit other application.
Grey-black Solvent Based Graphitic coating for foundry cores and moulds
Efficient penetration and coverage to provide maximum protection.
CMS GRAPHCOAT S-SPRAY is suitable for all types of chemically bonded cores
Produces a hard, silky coating finish
Recommended for coating of cores made from all chemical sands that are used for light to medium section irons and non-ferrous metals
It minimises and, in most cases eliminates, surface defects.
CMS GRAPHDIP S exhibits excellent wetting properties
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VACCUM MOULD PROCESS Vacuum forming is a simplified version of thermoforming,
where a sheet of plastic is heated to a forming temperature, stretched onto a single-surface mold, and forced against the mold by a vacuum.
Sheets of Polypropylene, Polyethylene, PVC and Acrylic
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WORKING
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ADVANTAGESLOWER TOOLING COST
HIGH SPEED /RAPID PRODUCTION
FLEXIBLE TOOLING DESIGN
WIDER DESIGN SCOPE
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DISADVANTAGES
INABILITY TO HOLD TOLERANCES
SECONDARY OPERATION NEEDED FOR FINISHED PART
BUBBLE FORMATION
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