Technologie et métiers





 

Mots clés

 

A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z
 
Word
[Heading]
Definition

A
Alloy
[Metals & alloys]		 A close blending of elements one of which at least is a metal; this blending possessing metallic characteristics.
B
Brass
[Metals & alloys]		 Copper and zinc alloy.
Bronze
[Metals & alloys]		 Copper and tin alloys eventually including different additions.
C
Casting process
[Casting & core work]		 Particular methods of execution and sequences of the essential processes for the manufacture of a mould or a core: packing, hardening, and stripping.
Core
[Casting & core work]

 Part of the mould executed separately, more often than not, with the purpose to practice a cavity in the casting or in order to simplify the molding.
Core out a casting
[Moulds design]		 To make use of cores in order to obtain certain cavities in the casting.
Cupola
[Melting]		 Shaft furnace, of vertical cylinder shape intended for the iron melting. The fuel, coke in general, is blended to the metallic charge.
D
Definition drawing
[Moulds design]		 Drawing specifying completely and without ambiguity, the sizes and all the requirements to which the product must satisfy in the finish state prescribed. This drawing must include the specifications being relevant to the mechanical characteristics of the materials, and a functional level of dimensional allowances and eventually the prescriptions of the surface state. This drawing will be evidence in the relations between the contractor and the manufacturer, mainly concerning the receipt of the product.
Drawing of rough castings
[Moulds design]		 Drawing obtained from the "definition drawing" on which are carried: the machining padding, the tapers, the modifications of forms making stripping and feeding easier, the jigging points, the reference plans, the foundry dimensional allowances, the metal's shade and the eventual heat treatments.
Ductility
[Metals & alloys]		 Property of a material which can experience the effects of a permanent deformation without fracture or crack under a tension and flexion effort.
E
Electric induction furnace
[Melting]		 Furnace in which the heat is produced by the effect of currents induced in the heart of the material itself (Eddy currents).
F
Feeder head
[Moulds design]		 1. A tank in the mould, receiving liquid metal at the moment of the filling operation, and restoring a part of this metal to the part during the solidification to compensate the volume reduction due to the shrinkage.
2. Metal filling this tank.
Fettling process
[Finish]		 To extract from a part, the sand constituting the core, after casting and solidification.
Flake graphite
[Metals & alloys]		 In the micrographic cuts, this graphite has the aspect of long and often forked lines.
G
Gate system
[Moulds design]		 Set of ducts practiced in the mould for the filling of the impression of the rough part equipped with its feeder heads.
Gravity die casting
[Casting in permanent moulds]		 In this process, the liquid metal is poured directly into the shell through a casting funnel placed on the top of it.
H
Heat treatment
[Finish]		 Operation or successive operations during which a metal or an alloy is submitted, in its solid form, to one or several thermal cycles (the temperature varying with the weather).
I
Investment casting
[Casting & core work]		 Expression employed to refer to a precision casting on lost wax pattern.
Iron
[Metals & alloys]		 Iron and carbon alloy usually containing other elements, silicon in general, the content of iron being such that a eutectic can be formed during the solidification. It is understood that 1,7 % is the minimal content of carbon.
J
K
L
Lost pattern casting
[Casting & core work]		 Expression referring to the casting technology making use of destructible patterns coated with a refracting material forming a mould without joint.
Low pressure die casting
[Casting in permanent moulds]		 In this process, an air pressure (0,6 to 1,5 bar) acts on the surface of the liquid metal, contained in a tight crucible, and makes it to go up in a tube dip in the bath and linked to the lower part of the metallic mould by which the filling is effectuated.
M
Molding
[Tools molding/manufacturing]

Manufacture of the pattern, the core boxes, and by extension, of all the tools elements, needed for the manufacture of a casting.
Molding drawing
[Moulds design]		 Drawing of the rough casting on which it has been defined the join face plans, the cores with theirs prints, the system to drive, the running and feeding system, and the venting, the quantity of alloy to implement by mould. This drawing completed by the indication of one or more contractions of the tapers and padding to apply, is the base for the execution of the tools. The choice of all these dispositions, which must be done in parallel to the drawing of the rough casting, constitutes the main step of the molding study.
Mould
[Casting & core work]		 A set of elements in appropriate materials delimiting the impression intended to receive a metal or alloy in liquid form that after solidification, will give the casting.
Mould assembly
[Casting & core work]		 To assemble with precision for the casting, all the mould parts that have been prepared separately: bottom, top, intermediate, cores, pouring basins, etc.
Mould joint
[Moulds design]

 Joint separating the tools and often found on the rough parts.
N
O
P
Pattern
[Tools casting/manufacturing		 A tool with a certain form and whose purpose is, when putting at its contact the appropriate materials, to obtain directly the mould cavity.
Permanent mould
[Casting in permanent moulds		 Mould intended for the repeated execution of parts or clusters by successive pouring, as longer as the dimensions of these parts are not altered by the wear of the mould and stay true to the drawing.
Pressure die casting
[Casting in permanent moulds]		 Casting process in which the liquid metal is introduced by an appropriated injection layout, into a permanent mould eventually cooled, under a much higher pressure (100 to 1000 bar and more) than for the gravity die casting or the low pressure die casting.
Q
R
Running & Feeding system
[Moulds design]		 Set of cavities and ducts bringing the metal in liquid form into the impression in order to compensate the shrinkage.

S

Sand-blasting
[Finish]		 To blast from the casting, the sand still sticking after the shakeout.
Shell
[Modeling, tools manufacturing]		 Metallic permanent mould designed for gravity or centrifugal casting.
Shot blast
[Finish]		 To clean a casting by means of a metallic shot jet projected at high speed by the centrifugal force of a turbine.
Spheroidal graphite
[Metals & alloys]		 This graphite is represented by spheres in the iron resulting from its treatment at the liquid state (these spheres are characterized by a white cross visualized at the micrographic exam effectuated with polarized light).
Stack casting
[Moulds designing]		 It is a particular system adopted for the filling of multiple parts cast in stacks; consisting in a main vertical duct (lowering) linked to as many horizontal distributing ducts as parts.
Stainless
[Metals & alloys]		 Oxidation stability, quality of an alloy or a metal resisting to the action of certain oxide media. This property is obtained in the mass by additions for metals liable to rust.
Steels
[Metals & alloys]		 Ferrous alloys are those with an iron content higher than the one of any other alloy element, generally fit for distortion at high temperatures, and having a carbon content lower than 2 %, which is the limit content separating steel from iron.
Stripping
[Molding and coring up]		 Operation consisting in separating the mould from the pattern or the pattern plate, or the core from its box.
T
To shake-out
[Finish]		 Separate the solid casting from its mould.
To fettle
[Finish]		 To clear a casting of all the metal surplus formed by the burs, the runners, whistlers, feeder heads, etc.
U
V
Vermicular graphite
[Metals & alloys]		 This graphite has the aspect of worms of different lengths and very irregular thickness but smaller than for the flake graphite and can be considered, after the form, as intermediate between the flake graphite and the spheroidal one.
W
Whistler
[Moulds design]		 Duct of a section relatively tight linking the upper part of the mould cavity to the upper part of the mould to allow, during the filling operation, the exit of air and gas.
X
Y
Z
Source : Dictionnaire idéologique de fonderie ATF/CTIF
 
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