GB/T 32930-2016Microcrystalline cemented carbide rod (English PDF)

3.1 Product classification and schematic

3.1.1 Product classification

Product, according to dimensional accuracy, is classified into blank rod and finely-ground rod.

3.1.2 Product schematic

See Figure 1 for product schematic.

3.2 Chemical composition Product's

chemical composition is determined by supplier and purchaser. It is guaranteed by supplier.

3.3 Organizational structure

3.3.1 Product's WC average grain size, porosity, non-combined carbon, macroscopic pores shall comply with the provisions of Table 1.

3.3.2 When purchaser has requirements for product's other organizational structure, it shall be determined by supplier and purchaser via negotiation.

3.4 Mechanical properties

3.4.1 Product's Rockwell hardness, bending strength shall comply with the provisions of Table 2.

3.4.2 When purchaser has requirements for product's other mechanical properties, it shall be determined by supplier and purchaser via negotiation.

3.5 Dimensions and tolerances, shape tolerances

3.5.1 See Table 3 for diameter tolerances of blank rod.

3.6 Appearance quality

3.6.1 Defects such as peeling, bubbling, blisters, delamination, cracks, adhesives are not allowed on surface of blank rod.

3.6.2 See Table 9 for allowable lengths, widths, depths of blank rod's circumferential chip, arris defect.

Diameter D Length L Diameter D Length L Diameter of blank rod D Roundness of blank rod Diameter of finely-ground rod D Roundness of finely-ground rod

3.6.3 On surface of finely-ground rod, there shall be no defects such as notch, chromatic aberration, scratch.

3.6.4 Surface roughness Ra of finely-ground rod shall not exceed 0.2 µm or be determined by supplier and purchaser via negotiation.

3.7 Other

When purchaser has other requirements for product, it shall be solved by supplier and purchaser via negotiation.

5.1 Inspection and acceptance

5.1.1 Product is inspected by supplier who shall ensure product complies with provisions of this Standard and contract (or order sheet) and fill in product's quality certificate.

5.1.2 Purchaser shall inspect received product according to the provisions of this Standard. If inspection results fail to comply with this Standard and contract (or order sheet), it shall propose to supplier within 3 months since product is received. It shall be solved by supplier and purchaser via negotiation. When arbitration is required, sampling for arbitration shall be conducted by supplier and purchaser at purchaser's site.

Diameter of blank rod D Lengths, widths of circumferential chip, arris defect Depths of circumferential chip, arris defect

5.2 Batching

Product shall be submitted for inspection in batches. Each batch of products shall be composed of products of same chemical composition, of same specification, of same category.

5.3 Inspection items and sampling

Inspection items and sampling of each batch of products shall comply with the provisions of Table 10.

5.4 Determination of inspection results

5.4.1 When inspection results of product's organizational structure, mechanical properties fail, it shall conduct double sampling to re-test rejected items. If one repeated test result still fails, this batch of products shall be determined as rejected.

5.4.2 When product's dimensions and tolerances, shape tolerances are inspected as rejected, this piece shall be determined as rejected.

5.4.3 When product's appearance quality is inspected as rejected, this piece shall be determined as rejected.

6.2 Product quality certificate

Each batch of products shall be provided with quality certificate, indicating:

a) supplier's name, address;

b) product name;

c) product lot number;

d) product's net weight or quantity;

e) inspection results of each item and technical supervision department imprint; f) inspection date.