Cemented Carbide Reamers

Cemented carbide reamers are used for small and medium-diameter hole semi-finishing and finishing. The cemented carbide reamers have small allowance, more gear, and good rigidity. The machining accuracy of the reaming can up to IT7 ~ IT6 level, even IT5 level, the surface roughness of up to Ra1.6 ~ 0.4 μm. So, it is widely used.

Cemented carbide reamers structures

Cemented carbide reamers are made up by the working portion, the neck and the shank portion. Working portion of the cutting portion and the calibration portion, the calibration portion has a cylindrical portion and an inverted conical portion. The main structural parameters cemented carbide reamer diameter d, the number of teeth z, edge angle Kr, back rake angle γp, after angle α., and slotted angle θ.

Cemented Carbide Reamers Structures

Cemented carbide reamers are made up by the working portion, the neck and the shank portion.

Cemented carbide reamers have many types. They can be divided into hand reamers and machine reamers by use methods.

Cemented Carbide Reamers Types

Cemented carbide reamers be divided into hand reamers and machine reamers by use methods.

d is hand reamers, its main declination Kr small, working part longer. Commonly used diameter is 1 ~ 71mm. Suitable for single and small batch production or cylindrical hole reaming assembly. e is adjustable hand reamers. The reamers blades mounted on the cutter body chute, and rely on both ends of the inner slope of the nut clamping. Rotation at both ends of the nut, promote the blade to move within the chute so that the diameter of the micro-telescopic. The commonly diameter is φ6.5 ~ 100mm. Using for machine repair.

Machine reamers can be divided into high-speed steel machine reamers and cemented carbide machine reamers. High-speed steel machine reamers diameter d = 20mm, made ​​of straight shank (Fig. a) made ​​the taper shank (Figure b) d = 5.5 to 50mm diameter d = 25-100mm do sets (Figure f ). It is used for batch production reaming holes in the machine on low speed. cemented carbide machine reamers with diameter d = 6 ~ 20mm made ​​straight shank made ​​of d = 8 to 40mm taper shank (Figure c), they are used for mass production machine reaming ordinary materials, difficult the holes of the processed material. Figure g Morse taper reamers, which from 0-6 7 specifications, respectively, for the reaming of 0 to 6, a Morse taper bore. Allowance larger set of generally composed by two. Partakers flute Morse taper reamers rough reamers. Figure h 1:50 taper pin reamers the commonly diameter Ф0.6 ~ 50mm, suitable for reaming 1:50 tapered bore.

Reaming process characteristics

Reaming smaller margin, generally is 0.05 to 0.2 mm. Usually reamers main angle of Kr <15 °, a The cutting thickness HD is very thin, and this case, in the transition portion between the cutting edge and the calibration edge, forming a region of the section of the thickness of the ultrathin cutting. Due to the reamers cutting edge some edge radius rn so often in the case hD <rn cutting, as shown in the following figure. The point on the rake angle of the cutting action is negative, the resulting extruded scraping effect. The machined surface has been subjected to squeeze scraping elastic recovery, but also by the rear corner of the calibration part is 0 ° blade with extrusion and friction, the reaming process is a very complex cutting, the process of extrusion and friction.

Reaming Squeeze Scraping

From the cutting action of the front angle is negative when generating a squeeze scraping role.

Reaming, usually taken Vc <10m/min to avoid flutter. The BUE is easy to produce, so that the aperture expand the surface of the inner hole spiral groove. The reaming cutting fluid plays a very important role, especially when using medium carbon steel with a high-speed steel reamers reaming cutting speed range is precisely the BUE generated speed range must adopt a hinge suitable cutting fluid elimination BUE, in order to improve the reaming finish..

Chinatungsten Online can provide various sizes and grades of cemented carbide cutting tools, non-standard products are also customized according to customer requirements. Welcome to consult and purchase sales@chinatungsten.com, sales@xiamentungsten.com.