CrazyMill Cool P&S Toric Version Milling Cutter

January 04,2022
Toric Carbide Endmill Developed for Roughing and Finishing

Mikron Tool expands the successful CrazyMill Cool P&S milling cutter family, developed for roughing and finishing operations, with a toric version. The new tool combines the strengths of milling and drilling and is designed for machining stainless steel, titanium, CoCr alloys and superalloys. Like its cylindrical predecessors, this drill/milling cutter can plunge perpendicularly into the material up to 1 x d and then continue machining laterally. It mills slots and pockets in the tightest of spaces - with no problem at all. When a corner radius is required, it is in its element. The right tool for each shape. 

It is available in the diameter range of 1 to 8 mm /.039" to .315" in the following two versions:

Typ A: 2.5 x d CrazyMill Cool P&S Corner Radius, cutting length 2.5 x d, Z3

Typ C:   5 x d CrazyMill Cool P&S Corner Radius, cutting length 2.0 x d, Z3

A unique tool for numerous applications: Milling of holes, ramps, pockets, grooves and sides. Seemingly without resistance, the milling cutter plunges into the materials that are difficult to machine. It cuts powerfully with high precision, stability and excellent cutting parameters, even into the solid - effortlessly. Behind this perfection is a sophisticated technology composed of a multitude of factors. 

A geometry thought out in every detail

A new cutting-edge geometry enables process-safe, low-vibration plunging (drilling). The first task was to stabilize the center of the cutting edge, which must be sharp and robust at the same time. This caused quite a few headaches. An ingenious solution was found that reduces the risk of cutting-edge breakout while at the same time reducing the cutting force. The extra-wide chip space in the head section allows chips to be collected during the drilling process and evacuated laterally into the likewise extended flutes. Adjusted rake and clearance angles as well as stable cutting corners assure smooth wall finish and avoid breaking out of cutting edges due to vibration, which is one of the central difficulties when "drilling" with a milling cutter.

Keeping cool is the key

But that's not all. The cooling channels integrated in the shank direct the coolant straight to the cutting edges and guarantee constant and targeted cooling in every position. The cooled cutting edges allow high speed and feed rates. In addition, thanks to the massive cooling jet, the chips are continuously flushed out of the milling zone. This prevents the chips from remaining in the recess and being repeatedly chipped, which causes damage to the milling cutter and the milled surface. The result is long tool life and excellent surface quality.

Attention to the choice of materials!

For this milling cutter, our production specialists use a specially developed ultra-fine grain carbide, which is characterized by high toughness and meets all requirements in terms of mechanical properties. Thus, the robust carbide shank supports stable and vibration-free milling. Highest precision and surface quality are guaranteed. 

The high-performance SNP coating not only increases surface hardness, but also enhances wear resistance and heat resistance. The sliding resistance during chip removal is also reduced to prevent the cutting-edge buildup. The result is optimum chip evacuation and a long tool life.

High performance becomes a matter of course

The combination of these factors enables impressive chip removal rates, which are possible thanks to the high cutting and feed rates and an infeed (ae) of 1 x d each. The drill milling cutter impresses with its long tool life and excellent surface quality, and this starting from a one-millimeter diameter. Here a few facts compared to commercially available tools:

  • Up to 5 x higher material removal rate 
  • Up to 5 x less machining time
  • Perfectly controlled chip removal 
  • Excellent surface quality Ra ≤ 0,5 µm (20 in µ)

It's surprising how much technology and power can be packed into such a small tool.

Convincing in the field as well

In an application of the aerospace industry, the toric high-performance milling cutter from Mikron Tool was convincing in initial comparative tests compared to a commercially available corner radius milling cutter. The task was to significantly reduce the machining time during roughing and finishing of 14 grooves with corner radius of a turbine rotor made from stainless steel (material X12Cr13/1.4006). The dimensions of the grooves are:

T = 10 mm (.394“); L = 20 mm (.787“) und B = 3,8 mm (.150“)

A CrazyMill P&S Corner Radius [diameter 3.7 mm (.146") 5 x d type C] was used. In the roughing process, the tool cuts directly into the solid with an axial depth of cut ap of 1.85 mm (.073") at a feed rate of 0.026 mm (.0110") per revolution per tooth and the material is removed at a cutting speed of 190m/min (623 SFM). In the final finishing process, the final slot dimension is achieved with excellent surface quality. The squareness of the sides is guaranteed. 

Overall, the Mikron Tool cutter achieves an excellent time chip volume during the roughing process of 9.4 cm3/min (.00248 gpm) compared to 0.5 cm3/min (.00032 gpm) of a conventional cutter. And that makes all the difference: The machining time, including finishing for the entire workpiece, is just 2 min 5 s compared to 26 min 6 s using a commercially available milling cutter. Mikron Tool is 24 minutes faster. 

Alberto Gotti, R&D manager at Mikron Tool, states: "Of course, the tool is crucial, but the interaction of all other elements must be equally correct. Machine, tool, milling strategy, clamping and coolant. If this is the case, the kind of performance shown in this example is achievable. The advantages for the manufacturer are impressive: a 19-fold increase in metal removal rate and a 92% reduction in machining time compared to a conventional corner radius milling cutter with external cooling." Another Crazy Tool from Mikron Tool, simply amazing.

Related Glossary Terms

  • alloys

    alloys

    Substances having metallic properties and being composed of two or more chemical elements of which at least one is a metal.

  • clearance

    clearance

    Space provided behind a tool’s land or relief to prevent rubbing and subsequent premature deterioration of the tool. See land; relief.

  • coolant

    coolant

    Fluid that reduces temperature buildup at the tool/workpiece interface during machining. Normally takes the form of a liquid such as soluble or chemical mixtures (semisynthetic, synthetic) but can be pressurized air or other gas. Because of water’s ability to absorb great quantities of heat, it is widely used as a coolant and vehicle for various cutting compounds, with the water-to-compound ratio varying with the machining task. See cutting fluid; semisynthetic cutting fluid; soluble-oil cutting fluid; synthetic cutting fluid.

  • cutting force

    cutting force

    Engagement of a tool’s cutting edge with a workpiece generates a cutting force. Such a cutting force combines tangential, feed and radial forces, which can be measured by a dynamometer. Of the three cutting force components, tangential force is the greatest. Tangential force generates torque and accounts for more than 95 percent of the machining power. See dynamometer.

  • cutting speed

    cutting speed

    Tangential velocity on the surface of the tool or workpiece at the cutting interface. The formula for cutting speed (sfm) is tool diameter 5 0.26 5 spindle speed (rpm). The formula for feed per tooth (fpt) is table feed (ipm)/number of flutes/spindle speed (rpm). The formula for spindle speed (rpm) is cutting speed (sfm) 5 3.82/tool diameter. The formula for table feed (ipm) is feed per tooth (ftp) 5 number of tool flutes 5 spindle speed (rpm).

  • depth of cut

    depth of cut

    Distance between the bottom of the cut and the uncut surface of the workpiece, measured in a direction at right angles to the machined surface of the workpiece.

  • feed

    feed

    Rate of change of position of the tool as a whole, relative to the workpiece while cutting.

  • flutes

    flutes

    Grooves and spaces in the body of a tool that permit chip removal from, and cutting-fluid application to, the point of cut.

  • gang cutting ( milling)

    gang cutting ( milling)

    Machining with several cutters mounted on a single arbor, generally for simultaneous cutting.

  • hardness

    hardness

    Hardness is a measure of the resistance of a material to surface indentation or abrasion. There is no absolute scale for hardness. In order to express hardness quantitatively, each type of test has its own scale, which defines hardness. Indentation hardness obtained through static methods is measured by Brinell, Rockwell, Vickers and Knoop tests. Hardness without indentation is measured by a dynamic method, known as the Scleroscope test.

  • mechanical properties

    mechanical properties

    Properties of a material that reveal its elastic and inelastic behavior when force is applied, thereby indicating its suitability for mechanical applications; for example, modulus of elasticity, tensile strength, elongation, hardness and fatigue limit.

  • milling

    milling

    Machining operation in which metal or other material is removed by applying power to a rotating cutter. In vertical milling, the cutting tool is mounted vertically on the spindle. In horizontal milling, the cutting tool is mounted horizontally, either directly on the spindle or on an arbor. Horizontal milling is further broken down into conventional milling, where the cutter rotates opposite the direction of feed, or “up” into the workpiece; and climb milling, where the cutter rotates in the direction of feed, or “down” into the workpiece. Milling operations include plane or surface milling, endmilling, facemilling, angle milling, form milling and profiling.

  • milling cutter

    milling cutter

    Loosely, any milling tool. Horizontal cutters take the form of plain milling cutters, plain spiral-tooth cutters, helical cutters, side-milling cutters, staggered-tooth side-milling cutters, facemilling cutters, angular cutters, double-angle cutters, convex and concave form-milling cutters, straddle-sprocket cutters, spur-gear cutters, corner-rounding cutters and slitting saws. Vertical cutters use shank-mounted cutting tools, including endmills, T-slot cutters, Woodruff keyseat cutters and dovetail cutters; these may also be used on horizontal mills. See milling.

  • rake

    rake

    Angle of inclination between the face of the cutting tool and the workpiece. If the face of the tool lies in a plane through the axis of the workpiece, the tool is said to have a neutral, or zero, rake. If the inclination of the tool face makes the cutting edge more acute than when the rake angle is zero, the rake is positive. If the inclination of the tool face makes the cutting edge less acute or more blunt than when the rake angle is zero, the rake is negative.

  • shank

    shank

    Main body of a tool; the portion of a drill or similar end-held tool that fits into a collet, chuck or similar mounting device.

  • superalloys

    superalloys

    Tough, difficult-to-machine alloys; includes Hastelloy, Inconel and Monel. Many are nickel-base metals.

  • wear resistance

    wear resistance

    Ability of the tool to withstand stresses that cause it to wear during cutting; an attribute linked to alloy composition, base material, thermal conditions, type of tooling and operation and other variables.

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