Benefits of Induction Hardening

Induction hardening is a form of heat treatment in which a metal part is heated by induction heating and then quenched. The quenched metal undergoes a marten’s tic transformation, increasing the hardness and brittleness of the part. Induction hardening is used to selectively harden areas of a part or assembly without affecting the properties of the part as a whole.

Process

Induction heating is a non contact heating process which utilizes the principle of electromagnetic induction to produce heat inside the surface layer of a work-piece. By placing a conductive material into a strong alternating magnetic field, electric current can be made to flow in the material thereby creating heat due to the I2R losses in the material. In magnetic materials, further heat is generated below the Curie point due to hysteresis losses. The current generated flows predominantly in the surface layer, the depth of this layer being dictated by the frequency of the alternating field, the surface power density, the permeability of the material, the heat time and the diameter of the bar or material thickness. By quenching this heated layer in water, oil, or a polymer based quench, the surface layer is altered to form a marten’s tic structure which is harder than the base metal.

Definition

A widely used process for the surface hardening of steel Induction hardening. The components are heated by means of an alternating magnetic field to a temperature within or above the transformation range followed by immediate quenching. The core of the component remains unaffected by the treatment and its physical properties are those of the bar from which it was machined, whilst the hardness of the case can be within the range 37/58 HRC. Carbon and alloy steels with equivalent carbon content in the range 0.40/0.45% are most suitable for this process.

A source of high frequency electricity is used to drive a large alternating current through a coil. The passage of current through this coil generates a very intense and rapidly changing magnetic field in the space within the work coil. The work piece to be heated is placed within this intense alternating magnetic field where eddy currents are generated within the work piece and resistance leads to Joule heating of the metal.

This operation is most commonly used in steel alloys. Many mechanical parts, such as shafts, gears, and springs, are subjected to surface treatments, before the delivering, in order to improve wear behavior. The effectiveness of these treatments depends both on surface materials properties modification and on the introduction of residual stress. Among these treatments, induction hardening is one of the most widely employed to improve component durability. It determines in the work-piece a tough core with tensile residual stresses and a hard surface layer with compression stress, which have proved to be very effective in extending the component fatigue life and wear resistance.

Induction surface hardened low alloyed medium carbon steels are widely used for critical automotive and machine applications which require high wear resistance. Wear resistance behavior of induction hardened parts depend on hardening depth and the magnitude and distribution of residual compression stress in the surface layer of Induction hardening Faridabad.

Induction Heating

Inductors are very efficient: very little energy leaks out of the pot into the air - most of it is transmitted into the kettle, which heats the water. In contrast, conventional hobs just get hot: they heat the kettle, because it's nearby, but lots of energy also escapes into the air. So, an induction cooker is very fast at heating water, compared to Induction hardening Faridabad.

We can see that the ceramic hot-plate isn't there to heat the kettle, because that's being performed by the field - in fact, it's there's to insulate the fairly delicate induction circuitry from the hot kettle. To stop it overheating, it needs to be cooled from underneath, and so tea-versions usually have a noisy fan roaring away. I don't like this about induction cookers. It really ruins the tea atmosphere.

Induction also has lots of other fun applications: as the water heats, the characteristics of the field change, which can be sensed by the induction unit, and so the field can be changed to compensate. This allegedly leads to induction kettles with temperature control - but they're usually fairly horrible. I've not seen one that I could trust so far, and it's infinitely easier (and more reliable) just to learn it yourself - and more satisfying in oil coolers in Faridabad.

Induction also requires some resilient materials. The magnetic field is always set up in the same way, and the location of the most heated areas is concentrated spatially - it's not an "all over" heat, like a conventional hot-plate would provide, but appears in regular "hot spots". You're heating the base of your vessel in a fixed pattern, repeatedly, and the (really rather significant) temperature differential across the metallic lattice can lead to stress fractures. Don't put your expensive Japanese kettle on an induction hob Induction hardening Faridabad!

Indirect Cooling - Induction Hardening Faridabad

Air cooled engines, like the one in my airplane, are actually cooled by more than just air blowing past the cylinder's cooling fins.  Internally, some of the heat is carried away by the engine oil.  This cooling is improved by the addition of a radiator for the oil.  In this posting, I will illustrate the installation of my oil cooler Induction hardening Faridabad.

The engine in my plane is a little larger than the standard engine for this aircraft and so I elected to go with a larger oil cooling radiator.  The trouble is that the larger radiator will not fit in the standard location which is hanging off of the baffles behind the rear left cylinder.  To overcome this problem, I will be relocating the cooler to the left side fire wall.

Whenever you veer off of the plans to make some sort of modification to the stock aircraft you are skating on ever thinner ice as you go.  But this mod doesn't have any structural ramifications so I think I'm pretty safe here.

First up:  make some brackets to mount the cooler to the firewall.

The cooler's air source will be the higher pressure air above the engine on the left side and will be connected to the cooler by a flexible 4" hose.  An intake plenum is required to adapt the hose to the cooler and that will be constructed of fiberglass.  A male mold is fashioned using modeling clay and a roll of tape that is just the right size for the hose (after I peeled off about 5 ft of tape) case hardening in Faridabad.

Indirect Cooling

In indirect cooling, the oil is cooled through the heat transfer of an intermediate medium, Weber explained.

“This is an outside system with an external heat exchanger, which uses water, liquid [such as glycol] or refrigerant, or thermos phoning to cool.” Shell-and-tube and plate-type heat exchangers would both use indirect coolers.

In water-cooled external heat exchangers, oil flows out of the separator. Either a pump or differential pressure forces oil through the heat exchanger. The oil temperature usually is controlled by the thermostatic valve controlling bypass of the heat exchanger.

Weber said that water-cooled cooling system components include :

• External shell-and-tube or plate-type heat exchangers;
• Three-way valve for temperature sensing, or a water-regulating valve;
• External piping; and
•  A relief valve
• The heat exchanger cools the oil before it is injected into the compressor.

How Oil Cooler Work and Common Problems?

In a stock setup, transmission fluid is cooled as its collected heat transfers to the colder engine coolant that surrounds it. Coolers usually work best when mounted in front of a stock radiator since this is where it can often get the most unobstructed source of oil coolers in Faridabad. This, in turn, allows much cooler fluid to return back to the transmission case.

While a majority of cars are not manufactured with proprietary engine oil coolers, there is a large aftermarket for them in many places, and they are common accessories in vehicles involved in towing and other heavy-duty applications. People can buy oil cooling kits to upgrade their vehicles themselves, though this usually requires a bit of expertise. Many professional shops will also install these for people looking for ways to make their machines more efficient.

Common Problems

The optimum temperature for oil is usually between 180° and 200°F (82° and 93°C). Failures start to occur when oil cannot dissipate its collected heat fast enough and rises past this threshold, which can begin to degrade the oil. Oil loses its lubricating, as well as its cooling, properties when it starts to break down, and this can lead to a number of serious engine and transmission problems. Induction hardening should usually be inspected fairly regularly to keep them in good working order, and owners should take care to regularly inspect and service them to avoid major failures.

Oil Cooler System

Ø  To prevent the unconstrained heating of the oil, most high-performance hydraulic systems include a hydraulic oil cooler, a device placed in line with the system to allow heat to dissipate from the oil.

Ø  As the mixture grows steadily cooler, other compounds condense, until it hits the top of the column.

Oil Cooler Radiator

Ø  An oil cooler is essentially any device or machine intended to cool oil, but in most instances people talk about it in the context of cars, trucks, and sometimes airplanes.

Ø  The cooling medium absorbs heat from the oil and carries it away from the cooler, where it is typically shed into the atmosphere. Common hydraulic coil cooler designs include radiator, shell and tube, or plate and frame types.

Large Oil Cooler

Ø  While a majority of cars are not manufactured with proprietary engine oil coolers, there is a large aftermarket for them in many places, and they are common accessories in vehicles involved in towing and other heavy-duty applications.

Ø  The lubricating oil in automobile engines also serves as a coolant, thereby absorbing heat from the combustion area and shedding it through separate oil cooler or the reserve oil in the engine sump. Large industrial gearboxes and drive trains also utilize combined oil lubrication and cooling.

Industrial Oil Cooler

Ø  An oil cooler is essentially any device or machine intended to cool oil, but in most instances people talk about it in the context of cars, trucks, and sometimes airplanes.

Ø  The lubricating oil in automobile engines also serves as a coolant, thereby absorbing heat from the combustion area and shedding it through separate oil cooler or the reserve oil in the engine sump. Large industrial gearboxes and drive trains also utilize combined case hardening in Faridabad.