GB/T 6883-2017Cemented carbide sintering body for wire, bar or tube drawing dies -- Dimensions (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 6883-1995, Wire, bar or tube drawing dies. As

sintered pellets of hard-metal.

Compared with GB/T 6883-1995, the major changes of this Standard are as

follows:

-- Partially adjust type-II product specifications;

-- Cancel the normal level of dimensional tolerance;

-- Respectively formulate the dimensional tolerance according to the wire

mold base and the bar and tube mold base;

-- Delete Appendix A, and standardize the requirements for machining

allowances;

-- Delete Appendix B;

-- Add requirements for size falling corners;

-- Revise the surface defect requirements of the mold base;

-- Add relevant contents of surface quality to the test methods and inspection

rules.

This Standard uses the redrafting method to refer to ISO 2804:1996, Wire, bar

or tube drawing dies - As-sintered pellets of hard metal (carbide) - Dimensions,

NEQ; and its degree of consistency with ISO 2804:1996 is non-equivalent.

This Standard was proposed by the China Nonferrous Metals Industry

Association.

This Standard shall be under the jurisdiction of National Technical Committee

243 on Nonferrous Metals of Standardization Administration of China (SAC/TC

243).

The drafting organizations of this Standard: Zhuzhou Cemented Carbide Group

Co., Ltd., China Nonferrous Metals Techno-Economic Research Institute,

Shenzhen Zhucheng Technology Co., Ltd.

The drafters of this Standard: Wang Huiping, Wu Jianbing, Liu Tiemei, Yang

Jun, Wu Yanhua, Zhao Guoming.

The previous versions of the standards which are replaced by this Standard are:

Cemented Carbide Sintering Body for Wire, Bar or

Tube Drawing Dies - Dimensions

1 Scope

This Standard specifies the dimensions and technical requirements for

cemented carbide sintering body for metal wire, bar or tube drawing dies.

This Standard applies to metal wire, bar and tube drawing dies.

2 Normative references

The following documents are indispensable for the application of this document.

For dated references, only the dated version applies to this document. For

undated references, the latest edition (including all amendments) applies to this

document.

GB/T 5242, Inspection rules and test methods of cemented carbide products

GB/T 5243, Marking, packing, transport and storage of cemented carbide

products

3 Symbols and names

Symbols and names which are referred to in this Standard are shown in Table

1.

Table 1

Symbol Name Unit

d1 Inner diameter of machining allowance

Millimeter

(mm)

d01 Inner diameter

d02 Outer diameter

d04 Entrance area width

d05 Exit area width

h02 Height

l01 Entrance area depth

l02 Deformation area depth

l03 Calibrating strap length

l04 Exit area length

R01 Entrance area chamfer radius

6 Test rules

1 part per

batch 4.4 5.1

Physical property,

mechanical property,

structure

Random sampling

of products (for

bending strength

Perform

according to

the

4.5 5.2

test, use the furnace

sample)

provisions of

GB/T 5242

Dimensions and

allowable deviation One by one - 4.6 5.3

Appearance quality One by one - 4.7 5.4

Note: for the chemical composition of the product, the supplier is allowed to report the

test results by the mixture.

7 Marking, packaging, transportation, storage and

quality certificate