1.)AIR GATE – A vertical channel for the removal of gases from the mould;
checking of the filling of the mould cavity with metal and feeding up
the casting with metal during solidification.
2.)BACK DRAFT – Taper or draft which prevents removal of pattern from the
mould.
3.)BINDER – Material used to hold the grains of sand together in moulds or
cores. May be cereal, oil, clay, resin, pitch etc.
4.)BLEED – Molten metal oozing out of a casting stripped or removed from
the mould before solidification.
5.)CAVITY, MOULD or DIE – Impression or impressions in a mould or die
that give the casting its shape.
6.)CHILL – A metal object placed on the outside or inside a mould cavity to
induce more rapid cooling at that point and thereby produce hard zone
i.e., hard, unmachinable surface.
7.)COPE – The upper or top most section of a flask, mould or pattern.
8.)DRAFT – Taper allowed on the vertical faces of a pattern to permit removal
of it from the sand mould without excessive rapping or tearing of the
mould walls.
9)DRAG – The lower or bottom section of a mould or pattern.
10.)FLASH – Thin fin or web of metal extending from the casting along the
joint line as a result of poor contact between cope and drag moulds.
In mechanical engineering a fillet is a rounding of the interior or exterior corner of a part. On the inlet fillets are concave while on exterior corners these are convex.We generally use fillet on the edges of almost every product.In this article we will see why fillets are used at corners.
We generally use fillets due to following reasons:
1.)Fillets are mainly used to reduce stress concentration compared to chamfers. These can easily distribute stress more uniformly.
2.)Fillets give a part better flow and less resistance. Using a fillet also eliminates any sharp edges that can be easily damaged, or that could cause injury when the part is handled. This means there is less risk of failing an inspection for having a burr or sharp edge.
3.)Industrial designers tend to prefer fillets compared to chamfers as these are considered to be visually pleasing.4.)One of the other reasons is that protective coating like paint are more uniformly distributed over a fillet compared to chamfer. Thickness of coating is reduced on sharp corners of chamfers so coating is lost first on these spots. Fillets have no such issues due to uniform distribution of coating.
But when it comes to comparison with chamfer in terms of cost then fillet is costly due to following reasons:
1.)A chamfer requires less machining time that a fillet radius.
2.)For fillets different radii of tools has to be stocked to create different radii, but a single tool can be used for creating different chamfers.
Still fillets are more preferred as compared to chamfers by industrial designers due to its advantages.Comment down your views in comment box.
You have probably noticed the lines on the rear windshield of your vehicle.Have you ever wondered what those thin lines running across the length of your rear window are for? We will discuss about these lines in this post.
These lines are called defoggers. These lines are electrified filaments which dissipate heat in the case your rear windows begins to fog up.A small current is passed through those embedded wires or lines, and as the current is conducted, it heats up the glass slightly—just enough to melt any snow or ice blocking your view, or eliminating any fog/condensation that was built up.Your front windshield comes equipped with defoggers, too. But since driving with a bunch of thin lines obstructing your view probably isn't ideal, it instead comes in the form of vents near the base of the glass.
All of these small details on a car may not seem to add up to much, but they are integral to the safety and comfort of the passengers, as well as the structural integrity of the vehicle itself. Next time you sit down for a long drive, pay attention to those tiny details and be grateful that someone in the car manufacturing industry thinks about the small stuff!
