PRESENTATION ON MOULD COATING PROCESSES

SUBMITTED BY:-Aashish Chandel75134005

CONTENTS INTRODUCTION MOULD COATING NEED OF MOULD COATING CHARCATERISTICS OF COATING MATERIAL GRAPHITE MOULD COATING VACUUM MOULD PROCESS WORKING ADVANTAGES AND DISAVANTAGES

MOULD A hollow container used to give shape to molten

or hot liquid material when it cools and hardens.

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.

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.

NEED MOULD COATING

DEMOULDING CLEANING EFFORT

TO INCREASE LIFETIME

DECREASE RFURBISHING EFFORT

FOR EVEN SURFACE

CHARCTERISTICS OF COATING MATERIAL

GOOD ADHESION TO SUBSTRATE

PROVIDE PROTECTION

AGAINST PENETRATION

BE FAST IN DRYING

GOOD COVERING

POWER

MINIMIZE CORE

STRENGTH DEGREDATION

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

CONTENTS IN GRAPHITE COATING

ASH CONTENT 12% - 15%

VOLATILE MATTER 3% MAXIMUM

MOISTURE CONTENT 1% MAXIMUM

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

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

WORKING

ADVANTAGESLOWER TOOLING COST

HIGH SPEED /RAPID PRODUCTION

FLEXIBLE TOOLING DESIGN

WIDER DESIGN SCOPE

DISADVANTAGES

INABILITY TO HOLD TOLERANCES

SECONDARY OPERATION NEEDED FOR FINISHED PART

BUBBLE FORMATION