Plateau Honing Crosshatch

2026-09-20 AMC-SCHOU

Technical Requirements for Plateau Honing Crosshatch of Engine Cylinder Bore

Technical Requirements for Plateau Honing Crosshatch of Engine Cylinder Bore

1 Scope

This document specifies the plateau honing crosshatch technical requirements, surface texture parameters, geometric accuracy, process control, inspection methods and acceptance criteria for engine cylinder bores. It applies to gasoline/diesel engine cylinder liners and block bores requiring plateau honing.

2 Normative References

  • ISO 4287: Geometrical product specifications (GPS) — Surface texture: Profile method — Terms, definitions and surface texture parameters
  • ISO 13565‑2: Surface texture: Profile method; Metrological characteristics of phase correct filters
  • ISO 13565‑3: Surface texture: Profile method; Parameters using the material ratio curve
  • JB/T 5082.7‑2026: Internal combustion engines — Cylinder liners — Part 7: Technical specifications and test methods for plateau honing crosshatch

3 Definition

Plateau Honing Crosshatch: A precision honed surface formed by two‑stage honing (rough honing + plateau finishing). It removes sharp peaks while retaining deep oil‑retaining valleys, forming a uniform crosshatch texture with high load‑bearing capacity and excellent lubrication retention.

4 Core Technical Requirements (Illustrated)

4.1 Crosshatch Angle

  • Included angle relative to bore axis: 110°–140°
  • Single‑side angle to horizontal: 30°–45°
  • Angle consistency along full bore length: ≤±5°
  • Uniformity: No blunting, shallowing or distortion at top/bottom dead centers.

4.2 Surface Texture Parameters (ISO 13565)

Parameter Description Target Range (μm)
Ra Arithmetic mean deviation 0.2–0.6
Rz Maximum height of profile 1.0–3.0
Rk Core roughness depth 0.3–0.8
Rpk Reduced peak height ≤0.2 (peaks flattened)
Rvk Reduced valley depth 0.8–2.0 (oil storage)
Mr1 Material ratio at core upper limit 10%–30%
Mr2 Material ratio at core lower limit 70%–90%

4.3 Geometric Accuracy

  • Bore diameter tolerance: ±0.005 mm (per drawing)
  • Roundness: ≤0.003 mm
  • Taper: ≤0.002 mm per 100 mm length
  • Cylindricity: ≤0.005 mm over full stroke

4.4 Surface Integrity

  • No honing scratches, spirals, chatter marks, burns or material deposits
  • No burrs at chamfers / edges
  • Cleanliness: Residual abrasive dust & oil ≤ grade ISO 16232‑Class 8

5 Process Control Requirements

  1. Two‑Stage Honing Mandatory
    • Rough honing: Coarse grit (120–220) to form crosshatch valleys
    • Plateau finishing: Fine grit (400–800) or brush to flatten peaks only
  2. No over‑hon­ing: Avoid eliminating oil grooves or losing crosshatch definition
  3. Cooling & Lubrication: Adequate flow to prevent thermal distortion
  4. Tool Stability: Uniform stroke speed; no dwell at ends

6 Inspection Methods

  1. Crosshatch Angle: Optical profile projector / microscope (magnification 50×–100×)
  2. Surface Texture: Contact stylus profilometer per ISO 4287 / ISO 13565
  3. Geometric Accuracy: Coordinate measuring machine (CMM) / bore gauge / roundness tester
  4. Visual Inspection: Magnified visual check for defects

7 Acceptance Criteria

  • All parameters meet Section 4 limits
  • Crosshatch continuous and uniform over full circumferential and axial surface
  • No visible or measurable defects affecting piston ring sealing and wear life
  • Inspection record traceable to batch, equipment and operator