JB/T 10766-2022Copper-based dry friction discs for clutches of forging machine tools - Technical specifications (English PDF)

1 Scope

This document specifies the technical requirements, test methods, inspection rules, marking, accompanying documents and packaging, transportation and storage of copper powder metallurgy dry brake friction lining of clutch of forging press.

This document is applicable to the manufacture of copper powder metallurgy dry brake friction lining of clutch of forging press (hereinafter referred to as "friction lining").

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document.

GB/T 1958, Geometrical product specifications (GPS) - Geometrical tolerance - Verification

GB/T 10421, Sintered metal friction materials - Determination of density

GB/T 10425, Sintered metal friction materials - Determination of apparent hardness

JB/T 7269, Sintered metal friction materials run without lubricants - Determination of frictional characteristics

3 Terms and definitions

No terms and definitions need to be defined in this document.

4 Technical requirements

4.1 The friction and wear properties and physical properties of the friction lining shall meet the requirements in Table 1. evenly distributed bonding points at the point where the friction layer falls off, which means the bond is firm.)

5 Test methods

5.6 Geometric errors shall be tested according to the provisions of GB/T 1958:

a) Parallelism detection: Use a micrometer to uniformly measure the total thickness point by point on the inner and outer rings of the lining surface of the friction lining, and take the difference between the maximum value and the minimum value of these measurement points as the parallelism of the friction lining;

b) Flatness detection: Place the two ends of the friction lining on the first-level flat plate; use a feeler gauge with an accuracy of 0.01 mm to measure point by point on the inner and outer rings of the friction lining surface; take the maximum value as the flatness of the friction lining.

5.7 See Table 3 for the inspection methods of the appearance quality and packaging quality of friction linings.

5.8 Use measuring tools such as micrometers, vernier calipers, measuring rods, and snap-gauges to measure the structure size of friction linings.

6 Inspection rules

6.5.2 If all the test results of the friction layer density, apparent hardness, and friction and wear properties meet the requirements of this document, the above inspection items of this batch of products shall be judged to be qualified. If any of the above inspection items does not meet the requirements of this document, re-inspect the item with double sampling; if the re-inspection results all meet the requirements of this document, judge the item qualified; if the re-inspection results still do not meet the requirements of this document, judge this batch of products as unqualified.

6.5.3 If all the inspection items are qualified, judge the batch of products to be qualified.

If any item is unqualified, judge the batch of products to be unqualified.

7 Marking and accompanying documents

8 Packaging, transportation and storage