His appearance these mills are required the need for a massive processing of soft materials like plastic, aluminum, composite and plexiglass. Conventional end mills are not shown uniform flexibility in all modes of processing such workpieces. Especially had problems with the entry and exit of the cutter into the workpiece material that was directly related to the geometry of end mills. There were difficulties with chip evacuation from the working area, which was formed many.
the Solution to this issue steel cutter new design of the geometry of the working part. They are called single-toothed.
What single-tooth mill?
This cutter is a tool for milling with a single tooth. Externally, it resembles a drill. The tool has a shank, which is clamped into the machine spindle and the cutting part consisting of a single tooth. The shank has a cylindrical shape.
Normally, the profile of sharpening the cutting edge of the tooth is a spiral that makes it easy to cut into the stock material. In fact, it turns out that the open cusp of the tooth is tilted to the plane of processing. It can not boast of standard end mills in which the end face has a flat angle.
the Presence of a tooth allows constructively to perform a deep groove. This enables an easy and quick removal of chips produced in large quantities in the processing of soft materials. Also, thanks to this milling cutter has better cooling, which positively affects her life.
Standard angle of the screw grooves is equal to 30°. However, in agreement with the customer, can be made tools with other values of this angle. The direction of slicing can be, both the right-left. In the first case, the chip is output up and the second down. During one visit the tooth is removed a single layer of material. Therefore, these cutters are sometimes referred to as single-pass.
Cutter mainly made of high speed steels R6M5 brands, A1LX, which show good strength characteristics at high processing speeds. To increase the hardness is sometimes added to tungsten and cobalt in the alloy, which is used to produce solid carbide tools for finishing.
All this, coupled with the special shape of the geometry gives a high resistance to wear and increased resistance to side loads.
Where used single-tooth mill
These cutters are applied in the following spheres of activity:
— mechanical engineering;
— advertising and furniture manufacturing;
— manufacture of Windows from aluminium and polyvinychloride (PVC).
single-tooth milling cutter is standard equipment for milling machines, including control software. Here it is used in such operations as contour milling panels made of aluminium, plywood and PVC. Also, they are milling slots and grooves.
What are the different types of single-tooth milling cutters?
Varieties single-tooth mills
these cutters are divided into several types, depending on geometry and mechanical properties of the surface of the work piece. It is advisable to consider them separately.
single-tooth cutters with polished flute
These cutters are designed for cutting wood, plywood, medium density, acrylic and aluminum. In order to improve the chip removal surface of the screw groove is mirror polished. This reduces friction and chip glides over it with no additional effort, which allows processing at higher speeds.
single-toothed cutter on the left scroll
Most mills are manufactured with right-hand cutting flutes. Here, the chip goes in the direction of the workpiece. However, for insertion of the tooth into the material, a quite large axial force, which pulls the workpiece up. When processing materials of small thickness it can lead to problems.
Therefore developed a single-toothed cutter with left-hand scrolling. Due leonapreciosa screw grooves discharge chips is directed toward the workpiece. Here the workpiece is pressed against the cutter down to the machine table. It can be noted that the separation of the layer of material is more evenly and achieved a clearer face milled surfaces.
it is Worth noting that mills of this type are appropriate for processing sheet blanks of material, a small hardness.
single-toothed cutter on the left scroll and with a polished groove
This tool is an improved version of the previous type cutters. They have left cheating helical grooves leads to difficulties in removing the chips from the working area, which limits the speed of rotation of the cutter and material feeder. Also this worsens the cooling conditions, which is undesirable factor.
So on the rear surface grooves villetaneuse grooves in spiral form. Their tilt angle is the same as that of the screw groove. The surface of the grooves is polished to a mirror Shine. This allows you to improve chip evacuation from the cutting area and cooling. As a result, increases the processing speed.
single-toothed cutter with a profile
the Most common profile is the so-called «hawk’s beak». The shape of the cutter teeth with the butt end of the tool is similar to a hawk’s beak and has a sharp pointed end. It turns out cutter is tilted in two planes: horizontal and vertical. Usually, the cutter with this profile is intended for end-to-end milling.
At the same time, not suitable for machining slots and grooves in fairly soft materials, such as wood. For this purpose, a tool with a flat sharpening of the cutting tooth which allows to obtain a smooth perpendicular face. For shallow grooves groove milling cutters is performed live. The evacuation is carried out with compressed air.
single-toothed cutter, as already noted, used for processing soft materials. The rotational speed of the tool can be different depending on the size and material of the workpiece and the cutter diameter. However, in practice, tend to use the highest possible value. For example, the recommended modes of treatment, the speed of rotation of the tool is several tens of thousand revolutions per minute. This is due to the fact that some materials have a low melting point, for example, plastic. For high-speed machining, he has no time to heat up to the melting temperature. Also because of this, when contour milling of sheet blanks, the professionals recommend to choose the depth of treatment is less than 0.05-0.1 mm than the thickness of the workpiece.
So there is a need for cooling of the working zone, including the cutter. It is organized with the help of the tabulation tubing, from which is fed the liquid. Aluminum is used for emulsions, and synthetic materials – the usual soapy water. The mill itself is cooled periodically with compressed air.
unlike the other cutters, single-tooth universal in application and easy in operation. They do all kinds of work on milling of workpieces made of aluminium, plastic, wood, composite and plexiglass. This includes roughing and finishing, milling of grooves and slots.