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The hard structure we created through the above treatment is brittle and can therefore break quite easily. Tempering the steel will make it tough and therefore stronger. Tempering follows immediately after quenching and entails heating the steel to a low temperature (150-350 °C) for a certain amount of time. The tempering temperature determines the final hardness of the material: higher tempering temperatures result in higher steel toughness; lower tempering temperatures mean higher hardness.
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What is hardening process in heat treatment
As the work advances into the cutter, each tooth of the cutter advances into the work an equal amount producing chips of equal thickness.
Cutting speed is defined as the speed at the outside edge of the tool as it is cutting. This is also known as surface speed. Surface speed, surface footage, and surface area are all directly related. If two tools of different sizes are turning at the same revolutions per minute (RPM), the larger tool has a greater surface speed. Surface speed is measured in surface feet per minute (SFM). All cutting tools work on the surface footage principle. Cutting speeds depend primarily on the kind of material you are cutting and the kind of cutting tool you are using. The hardness of the work material has a great deal to do with the recommended cutting speed. The harder the work material, the slower the cutting speed. The softer the work material, the faster the recommended cutting speed (See Figure 1).
This chip thickness or feed per tooth, along with the number of teeth in the cutter, form the basis for determining the rate of feed.
In the hardening process – the first of the two steps in hardening steel – the steel is brought to its utmost hardness by heating the material to a temperature in excess of 800°C to bring it into the so-called ‘austenite zone’, and keeping it at this temperature for a certain amount of time. All carbon in the material and a part of the alloying elements will dissolve into the austenite structure.
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Tap guides are an integral part in making a usable and straight thread. When using the lathe or the mill, the tap is already straight and centered. When manually aligning a tap, be careful, as a 90° tap guide is much more accurate than the human eye.
Hardenedsteelmechanical properties
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After the heating phase, the workpiece is cooled rapidly in the so-called ‘quenching’ of steel. This is generally done by soaking the material in a bath of water or polymer, or by cooling the workpiece with forced air or a water mist (fog quench). Quenching captures the carbon atoms in a certain structure (the ‘martensitic structure’). Hardening steel requires a carbon content of at least 0.3%, and the more carbon there is in the steel, the harder the workpiece will be after the heat treatment. The same goes for the percentage of alloying elements.
Steel is a naturally strong material, but it can be made even stronger and more wear-resistant after application of a special heat treatment, the so-called hardening of steel. This hardening process comprises two steps: hardening, followed by tempering.
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Hardenedsteelmaterial list
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Feeds for end mills used in vertical milling machines range from .001 to .002 in. feed per tooth for very small diameter cutters on steel work material to .010 in. feed per tooth for large cutters in aluminum workpieces. Since the cutting speed for mild steel is 90, the RPM for a 3/8” high-speed, two flute end mill is
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On the milling machines we have here at LBCC, the feed is independent of the spindle speed. This is a good arrangement and it permits faster feeds for larger, slowly rotating cutters.
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When drilling and tapping, it is crucial to use oil. It keeps the bits from squealing, makes the cut smoother, cleans out the chips, and keeps the drill and stock from overheating.
Case hardeningsteel
The hardness of the cutting tool material will also have a great deal to do with the recommended cutting speed. The harder the drill, the faster the cutting speed. The softer the drill, the slower the recommended cutting speed (See Figure 2).
Types of hardening process
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Once the SFM for a given material and tool is determined, the spindle can be calculated since this value is dependent on cutting speed and tool diameter.
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Pecking helps ensure that bits don’t overheat and break when using them to drill or tap. Peck drilling involves drilling partway through a part, then retracting it to remove chips, simultaneously allowing the piece to cool. Rotating the handle a full turn then back a half turn is common practice. Whenever the bit or tap is backed out, remove as many chips as possible and add oil to the surface between the drill or tap and the workpiece.
Smit Heat Treatment is your go-to expert for heat treatments for any kind of metal you can think of. Thanks to our extensive know-how of materials and processes, we know exactly what kind of result requires what kind of treatment. Hardening steel, for example, entails highly specialised heat treatments aimed at bolstering the material’s strength and making it more hardwearing.
Types of hardenedsteel
Feed per tooth, is the amount of material that should be removed by each tooth of the cutter as it revolves and advances into the work.
Drilling machines that have power feeds are designed to advance the drill a given amount for each revolution of the spindle. If we set the machine to feed at .006” the machine will feed .006” for every revolution of the spindle. This is expressed as (IPR) inches per revolution
This page was last edited on 4 December 2021, at 15:11. Content is available under CC BY-SA 4.0 unless otherwise noted.
The feed (milling machine feed) can be defined as the distance in inches per minute that the work moves into the cutter.
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