Piston rod

Jansen produces tubes for piston rods in shock absorbers for automotive engineering. The demands to these tubes are varied. Processing and refining the outer surface requires excellent tube surface qualities. High levels of reforming properties and homogeneous reforming characteristics are required for swaging tube ends and rolling the thread. Tight tolerances guarantee efficient piston rod production as part of production processes. High levels of material purity guarantee the fatigue strength of shock absorbers. The demand for light-weight design can only be met by using high-tensile materials.

Requirements

  • High strength values (elongation at break, tensile strength)
  • Excellent surface-finish condition
  • High levels of fatigue strength
  • Excellent geometrical strength
  • High levels of strength and hardness as per Q+T

Material properties

  • High strength (YS, TS) and fatigue strength
  • Homogeneous strength properties and ductility
  • Potential to reduce wall thickness

Structure

  • Homogeneous, fine-grain structure (weld seam and basic material)
  • Minimised surface decarburisation (inner and outer surfaces: < 100 µm)
  • Excellent weld seam quality

Geometry

  • Minimised fluctuations in wall thickness and inner/outer diameter
  • Minimised deviations in straightness
  • Minimised deviations in roundness and linear movement
  • Minimised eccentricity
  • Specific tube end processing: sawn/brushed; chamfered

Surface

  • Minimised surface irregularities (adhesions, scratches, dents, etc.)
  • Excellent surface condition thanks to tube drawing
  • Minimised corrosion protection, optionally specific corrosion protection
  • Increased surface hardness thanks to surface coatings/hardening
Piston rod