Technical requirements for cemented carbide indexa

2022-10-02
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Technical requirements for cemented carbide indexable blades in China

1 technical requirements for cemented carbide indexable blades with round holes, without holes and counterbores

1) the flatness of the back of the blade, inward concave not more than 0.05mm, outward convex not more than 0.03mm

2) the flatness of the base surface of the blade, the blade with round hole and the blade without hole can only be concave inward, and its value is not greater than 0.05mm; The counterbore blade is only allowed to be concave inward, and its value is not greater than 0.03mm

It can also be printed

3) the blade surface shall not have defects harmful to the use, and the edge part shall not have edges and corners; The edge and angle loss of non working parts is no more than 0.3mm, and covestro has continuously proved that it is at the forefront of innovation

4) the main performance and structure of the blade shall comply with Yb cemented carbide brand or relevant standards

5) the cross-sectional structure of the blade shall be uniform, and there shall be no defects harmful to the use

6) all newly developed or imported new materials should be higher than Yb standard and meet the recommended value of the enterprise

2 technical requirements of carbide indexable milling insert

1) the surface roughness of indexable milling insert shall meet the requirements of the following table:

allowable deviation level front and rear (RA) behind the polishing edge (RA) a0.40.4c0.80.8k1.60.8e1.60.8

2) the tolerance of D, m and s of common accuracy levels a, C, E and K of milling insert, see the following table

dd allowable deviation m allowable deviation s allowable deviation grade deviation grade deviation grade deviation grade A, C, ekac, Kea, C, e, k6.35 ± 0.025 ± 0.05 ± 0.005 ± 0.013 ± 0.0259.525 ± 0.0512.70 ± 0.0815.875 ± 0.1019.05 ± 0.10

3) blade base flatness, only inward concave is allowed, and class A is not greater than 0.005mm; Grade C is not greater than 0.01mm; Class k and class E shall not be greater than 0.02mm

4) the blade surface shall not have defects harmful to the use, and the edge part shall not have edges and corners; The edge and corner falling of non working parts shall not be greater than 0.3mm

5) the importance of the blade ensures that the experimental machine will not be overloaded and damaged. The energy and structure should comply with Yb "cemented carbide brand" or relevant standards

6) the cross-sectional structure of the blade shall be uniform, and there shall be no defects harmful to the use

3 cemented carbide indexable blades other common technical essentials

1) all blades with surface chemical coating (CVD), including turning blades, milling blades or other cemented carbide blades, must be rounded with n amorphous plastic ≤ 0.5% tension before coating, and the arc radius of the blade γε ≤5 m。

2) if the indexable blade is not marked with the allowable deviation of the rear angle, the allowable deviation is ± 1 °; In addition, the arc radius of the tool tip γε ≤ 1.0mm, the allowable deviation is ± 0.1mm, γε r> 1.0~2.0mm, the allowable deviation is ± 0.15mm

3) for indexable blade products, each blade shall be engraved and etched with a mark with identifiable characteristics, such as material category or coating code

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