# MI friction machine, disc-on-block — Kharkiv Tractor Plant (KhTZ)

**IE S041**  
Kharkiv Tractor Plant (KhTZ) · Ukraine · 2002

A groove cut with a tool healed over, friction in the pair dropped, the friction surface became smoother. Ukraine · 2002.

## Measured

- filling of the artificial groove, depth 0.2 → 0.009-0.048 mm — **76-95 %**
- friction coefficient of the steel–cast iron pair, 0.121 → 0.011 — **11×**
- roughness of the friction surface, Ra 1.2 → 0.08-0.1 — **12-15×**

## Conclusion

A groove cut with a tool healed over, friction in the pair dropped, the friction surface became smoother

Page: https://industry.xado.com/case/otchet_oao_khtz_effektivnost_revitalizantov_g
PDF report: https://industry.xado.com/pdf/TIER%20S/KhTZ/machine-friction-MI-pair-steel/IE-S041_XADO_KhTZ_machine-friction-MI-pair-steel_EN.pdf
Original scan: https://industry.xado.com/scans/otchet_oao_khtz_effektivnost_revitalizantov_g.pdf