GB/T 970.2-2008Circular screwing dies - Part 2: Technical specifications (English PDF)

Foreword

GB/T 970 "round die," consists of two parts.

--- Part 1. round die and round die holder type and size;

--- Part 2. Technical requirements.

This section is Part 2 of GB/T 970.

This part is GB/T 970.2-1994 "round die technical conditions" amendments.

Section compared with the GB/T 970.2-1994 The main changes are as follows.

--- Added "foreword";

--- Standard name changed to "round die Part 2. technical conditions";

--- In the range of a chapter, the words "This standard applies to the processing of common screw (GB/T 192 ~ 193, GB/T 196 ~ 197) of the circular plate Teeth "to" This section applies to press GB/T 970.1 Production of round die ";

This section instead of the date of implementation of the GB/T 970.2-1994.

1 Scope

This section provides round die size, material and hardness, surface roughness and appearance, performance testing, marking and packing of the basic requirements.

This section applies to press GB/T 970.1 Production of round die.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

GB 443 L-AN Total loss system oil

GB/T 970.1 round die Part 1. round die and round die holder type and size (GB/T 970.1-2008, ISO 2568. 1988, MOD)

3 Dimensions

Tolerance 3.1 round die outer diameter D of the press f10, E thickness tolerances press js12.

3.2 Round die position tolerance given in Table 1

Note: Measurement and outer side facing the axis runout should be carried out on the threaded spindle taper.

4 Material and hardness

4.1 round die having the same performance with other 9SiCr W6Mo5Cr4V2 alloy tool steel or high speed tool steel, and above grade Manufacturing materials.

4.2 hardness round die thread portion with 9SiCr made not less than 60HRC. Round die thread portion fabricated using W6Mo5Cr4V2

5 Appearance and surface roughness

5.1 round die surface should not have cracks, scratches and rust. Cutting edge should be sharp and should not have glitches, blunt impact and grinding burns use Defective performance.

5.2 round die surface roughness of the upper limit value given in Table 2 below.