Kieserling WRPH 230 Heavy-Duty Hydraulic Bar Straightener – Refurbished 2013
| Machine Type | Bar Straightener |
| Manufacturer | Kieserling |
| Model | WRPH 230 |
| Year of Manufacture | 1978 |
Technical Specifications
| Diameter range (low & medium carbon) | 30 – 230 mm |
| Diameter range (high carbon, 1000 N/mm²) | 30 – 180 mm |
| Straightening speed | 0 – 20 m/min |
| Angular adjustment | 10 – 20 degrees |
| Straightening force (hydraulically cushioned) | 450 tons |
| Straightening force (not cushioned) | 580 tons |
| Roll diameter | 700 mm |
Drive & Electrical Data
| Main motors | 2 × 200 kW DC motors |
| Motor speed | 700 / 1400 rpm |
| Supply voltage | 460 V |
Condition & History
The unit was completely refurbished prior to acquisition in 2013. Since then, it has been stored in a warehouse and is in ready-to-ship condition, as shown in the available photographs.
The machine was originally transported from Italy; however, it is believed to be of German origin.
Technical Evaluation of the Kieserling WRPH 230
Bar Straightener (Year 1978)
1. Technical Evaluation Overview
The Kieserling WRPH 230 is a heavy-duty hydraulic bar straightener designed for straightening round bars across a wide diameter range. The machine is rated for 30–230 mm diameter bars in low and medium carbon steels, and 30–180 mm diameter bars in high-carbon material up to 1000 N/mm² tensile strength.
Operating speed is specified from 0 to 20 m/min, with an angular adjustment range of 10 to 20 degrees, allowing setup flexibility for different material behaviors. Straightening force is stated as 450 tons (hydraulically cushioned) and 580 tons (not cushioned), indicating substantial forming capability.
The machine uses 700 mm diameter rolls and is driven by two DC motors rated at 200 kW each, operating at 700/1400 rpm on 460 V supply. The unit is reported to have been completely refurbished prior to purchase in 2013 and subsequently stored.
2. What to Check Before Buying
Given the machine’s age and refurbishment history, verification should focus on both mechanical integrity and electrical modernization status. Mechanically, inspection should include roll surfaces and bearings, straightening frame condition, and alignment of the roll set across the full diameter range. The hydraulic system should be tested for pressure stability, cushioning response, and leakage, particularly when switching between cushioned and non-cushioned force modes.
Electrically, the DC drive motors and associated drives should be evaluated for insulation condition, control responsiveness, and availability of replacement components. Confirmation of refurbishment scope (hydraulics, bearings, electrical components, controls) and supporting documentation is important. Safety systems and emergency circuits should be checked against current operational requirements.
3. Typical Industrial Applications
Based strictly on the stated capacity and forces, this machine is suitable for straightening large-diameter steel bars used in forging, heavy machining, construction, energy, and general steel processing applications. It is appropriate for operations requiring correction of residual curvature in low-, medium-, and specified high-carbon steels within the listed diameter limits.
4. Common Risks in Used Machines
Common risks for used bar straighteners include roll wear or misalignment, hydraulic component fatigue, and obsolescence of DC drive electronics. Long storage periods can introduce risks related to seal degradation, corrosion, or electrical insulation aging. Uncertainty about the extent of refurbishment or missing documentation can complicate recommissioning.
5. Maintenance and Service Considerations
Maintenance needs depend on operating hours since refurbishment, which are not provided. Regular attention should be given to hydraulic oil condition, seals, roll bearings, and alignment, as well as periodic inspection of DC motors and drives. Long-term service planning should consider availability of Kieserling-specific mechanical parts, as well as support options for DC drive systems.
Given the machine’s size and force levels, foundation condition and handling provisions should also be reviewed prior to installation.
Final Note:
While straightening capacity, forces, and drive power are clearly stated, critical details—such as control system configuration, extent of the 2013 refurbishment, and post-refurbishment operating hours—are important. These elements should be verified through documentation review and functional testing before forming final technical conclusions.
