Cemented carbide cutting tools composition

As shown in the figure, turning is made up of head, shank two parts. Head is used for cutting, shank used for clamping.

Cemented Carbide Cutting Tools Composition

Turning is made up of head, shank two parts

The cutting portion of tungsten carbide cutting tools is constituted by the rake face, cutting edge. Flank marked with the letter A and the lower corner of a symbol mark, the cutting edge is marked with the letter S. Minor cutting edge and its associated flank plus in the upper right corner of the tag write to show the difference.

l.Flank

The rake faces Aγ -tungsten carbide cutting tools the surface of the chip flow.

Flank Aa - the opposite surface with the transition surface.

Minor flank Aa' - the surface opposite to the machined surface.

Cemented carbide cutting tools body contained between the front and rear part of is said knife wedge.

2．Cutting edge

The main cutting edge S - collected and submitted by the front and rear edges.

The secondary cutting edge S'- he cutting edge besides the main cutting edge.

3．The tool tips

Issue to the short main and auxiliary cutting edge to cutting edge of the tool tip.
Impossible to sharpening very sharp cutting edge, there is always some edge arc, as shown in Figure a. The degree of edge sharp is cutting blade edge radius rn The General Tool Steel Tool rn about 0. 01-0.02mm, tungsten carbide cutting tools rn is about 0.02-0 04mm. Meet different processing requirements in order to improve the edge strength to the front, rear grind the chamfered surface Aγ1, Aɑ1, Figure a shows. bγ1 is the first front Aγ1 chamfers width; bɑ1, first behind Aɑ1 chamfer width.

In order to improve the cutting performance of the tool tip, often the tool tip made of rounded tip or a chamfering tool tip, shown in Figure b. Its parameters:

1)The tip arc radius rε is rounded nominal radius at the tip of the base surface measurement;

2)Chamfered tip lengthbε；

3)Tool tip chamfer declination Krε。

Wedge and Nose Shape

Cemented carbide cutting tools angles reference system.

Tungsten carbide cutting tools angles are important parameter for determining the tungsten carbide cutting portion of the cutting tools geometry. Cemented carbide cutting tools angles for defining the respective reference coordinate plane, called the reference system. Reference system, there are two types: the tool stationary reference frame - the marked tool design, grinding and measuring benchmarks using this tool angle defined by said tool marked angle; the tool working reference system - to determine the cutting tool angles benchmark, use this tool angle defined by said tool angle.

Tungsten carbide cutting tools design, label, grinding, and the most common is the measured angle to the reference system of the orthogonal planes. But the label indexable cutter or a large edge inclination tool commonly used in the normal plane of reference. In the manufacturing process of cemented carbide cutting tools such as milling cutter groove when sharpening flank, often required assuming that the work plane, the angle of the back of the plane reference system, or prior to use, followed by orthogonal plane angle of the reference system.

Tungsten carbide cutting tools angles.

Tungsten carbide cutting tools angles is expressed in spatial orientation parameters cemented carbide cutting tools surface. In the perspective of various types of reference lines on the most basic type only four, namely the anterior horn, posterior horn, declination, edge inclination angle, which is defined as follows (see Figure l-9a shown).

Types of Cemented Carbide Cutting Tools Angles

Orthogonal plane reference system tool angle defined.

(1)Rake angle γo - orthogonal to the plane of measurement of the angle between the front and the base surface.

(2)The posterior horn ɑo - orthogonal plane angle measured behind the cutting plane.

(3)The main angle k r - the angle between the main cutting planes measured in the basal plane and assumed working plane.

(4)Edge inclination λs - measured in the cutting plane, the angle between the cutting edge and the base surface.

Tungsten carbide cutting tools angles dimension symbol subscripts English lowercase letters, and measuring the angle reference plane symbol subscript consistent. The upper right corner with a left, said vice blade on the plane or angle. Lathe tool can be determined using the four corners of the main cutting edge and its front and rear position. Wherein γO λs corners determine the orientation of the front, with ɑo kr corners can determine the orientation of the rear, kr, λs the corners may determine the orientation of the main cutting edge. The secondary cutting edge and its associated front, followed by the orientation in space is also an angle of 4, i.e.: vice rake angle γo ', the auxiliary rear corner ɑo' vice declination Kr ', the auxiliary cutting edge inclination angle λs'. Their definitions and the four angles of the main edge are similar.

Tungsten carbide cutting tools angles plus or minus provisions

As shown, the front and parallel to the base surface before the angle is zero. The angle between the front and the cutting plane is less than 90 ° when the rake angle is positive, and is greater than 90 ° when the rake angle is negative. The angle between the back and the base surface is smaller than 90 °, after the angle is positive, is greater than 90 °, after the angle is negative.

The blade angle is the measured value of the front and the base surface of the cutting plane, therefore its sign is the judging method is similar to the rake angle. The cutting edge and the base surface is parallel to the (Cutters bottom plane) when the cutting edge inclination angle is zero, when the tool tip relative Cutters bottom plane is at the highest point, the cutting edge inclination angle as positive, at the lowest point when the cutting edge inclination angle is negative.

Cemented Carbide Cutting Tools Positive and Negative Angles

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