GB/T 3142-2019Standard test method for determination of load-carrying capacity of lubricants—Four-ball method (English PDF)

Foreword

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

This standard replaces GB/T 3142-1982 "Lubricant Bearing Capacity Measurement Method (Four Ball Method)".

Compared with GB/T 3142-1982, this standard has the following technical changes as follows.

---The unit of measurement adopts the International System of Units.

--- Added Chapter 2 normative references.

--- Move the compensation line of the four ball machine of Figure 1 in GB/T 3142-1982 to Appendix B.

--- Correct the expression error in GB/T 3142-1982, and change "5%" in 3.4 and 8.9 to "(1 5%)".

--- 3.6 adds the expression of P in the formula and describes the lever type four-ball machine.

A detailed description of the reagents is added to --5.1.

--- 5.2 increases the requirements on the material and hardness of the test steel ball.

--- Added a detailed description of the instrument in Chapter 6.

--- Expand the load range of the four-ball machine to "59N~9810N". Corresponding changes have been made in 6.1, and the load level is increased in Table 1. At level 23, the corresponding load correction sum data is added in Table 4.

--- Increase the content of regular calibration of the four-ball machine. 6.1 Add a description of the calibration of the four-ball machine, Table A.1 to Appendix IV in Appendix A The ball machine reference grease is modified accordingly and added instructions.

---7.1 Preparation for the increase in the speed of the four-ball machine and the test ambient temperature.

--- Added detailed test steps and precautions in Chapter 8, and detailed procedures for reading the diameter of the wear spot.

--- For ease of use, add Table 3 in 8.9, the table is established according to the level of PB, the operator can directly according to the table The level of testing. A new method for the determination of PB in new lubricants, especially unconventional lubricants, is added to this note.

---8.11 Add a description of the PB level when looking up Table 4.

1 Scope

This standard specifies methods for determining the bearing capacity of lubricants using a four-ball extreme pressure tester, including maximum cardless bite load (PB), sintering. Determination of load (PD) and comprehensive wear value (ZMZ).

This standard applies to lubricants. In practical applications, different evaluation indicators can be selected according to the different uses of the lubricant.

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 308.1-2013 Rolling ball - Part 1: Steel ball

GB 1922-2006 Solvent oil for paints and cleaning

GB/T 15894-2008 chemical reagent petroleum ether

3 Terms and definitions

The following terms and definitions apply to this document.