| Escofier P440 CN Thread Rolling Machine – Technical Specifications | |
|---|---|
| Process Type | Thread Rolling Machine |
| Operating Parameters | |
| Burnishing Force | 100 – 4,000 daN |
| Rotational Speed | 100 – 180 rpm |
| Forward Speed | 0.1 – 20 mm/s |
| Reverse Speed | 0.1 – 30 mm/s |
| Inclination Angle | ±6° |
| Workpiece & Tooling | |
| Max. Workpiece Diameter | 100 mm |
| Min / Max Thread Diameter | Up to Ø 100 mm |
| Tool Mount Diameter | 76.2 mm |
| Tool Diameter Range | 180 – 245 mm |
| Roller Axis Height | 135 mm |
| Axis Distance | 212 – 364 mm |
| Power | |
| Main Motor Power | 8.6 kW |
| Dimensions & Weight | |
| Overall Dimensions (L × W × H) | 4,250 × 3,860 × 2,600 mm |
| Machine Weight | 5,800 kg |
LEAD DEFECT CORRECTION
Lead defects of a gearbox are corrected on a Klingelnberg gear inspection
machine or a Hofler gear tester. If the error is significant, correction of an
expandable chuck may be needed. This requires partial grinding or reboring
depending on the severity of the defect.
In order for the control to be valid, one must have a burnished part for which
the dimension on both the control plane of the gear and the reference surface
coincide.
Concerning the helix inspection also detects taper defects (see example below).
Separating the cumulative defects is a more delicate task, which is why we
recommend separating the two inspection data.
After correcting any taper defects, the helix value determined by measurement
rolled parts requires correction. A position or negative correction may be
determined theoretically in the following manner and based on a helix deviation
recording provided by a gear measuring machine (see table No. 1).
angular_correction = a × 10³ / (180 × cos β) (A)
b × π
a = true deviation of the helix in μm
b = measurement reference length in mm
β = helix inclination angle in °
Technical Evaluation of the Escofier P440 CN
Thread Rolling Machine
1. Technical Evaluation Overview
The Escofier P440 CN is a dedicated thread rolling / roller burnishing machine designed for forming external threads through plastic deformation rather than material removal. The machine operates with a burnishing force range of 100–4,000 daN, supporting controlled forming across a wide range of thread sizes within the stated limits.
Operating speeds are defined by a rotational speed of 100–180 rpm, with forward feed speeds of 0.1–20 mm/s and reverse speeds of 0.1–30 mm/s, allowing adjustable cycle control. An inclination capability of ±6° supports angular adjustment for thread geometry requirements.
Workpiece capacity is stated as up to Ø100 mm, with tooling parameters including a 76.2 mm tool mount diameter and roller diameters from 180 to 245 mm. The machine is powered by an 8.6 kW main motor. Overall dimensions are 4,250 × 3,860 × 2,600 mm, with a machine weight of 5,800 kg. No control system type, automation level, or accuracy data is provided.
2. What to Check Before Buying
Inspection should focus on forming system integrity and mechanical alignment. The rolling head and roller axes should be checked for wear, rigidity, and smooth adjustment across the stated axis distance range of 212–364 mm. Rollers should be inspected for surface condition and compatibility with the intended thread profiles.
Drive systems should be tested for stable speed control within the specified rpm range and consistent force delivery across the full burnishing force spectrum. Verification of the inclination mechanism (±6°) is important, as angular accuracy affects thread form.
Electrical systems and safety circuits should be inspected, noting that the control architecture is not specified. Confirmation of documentation, tooling sets, and setup gauges is recommended due to their importance in thread rolling operations.
3. Typical Industrial Applications
Based strictly on the stated capacities, this machine is suited for cold-forming external threads on cylindrical components up to 100 mm diameter. Typical applications include automotive fasteners, transmission shafts, studs, and industrial threaded components where improved surface finish, work hardening, and fiber flow continuity are required. Use outside the stated diameter and tooling ranges should not be assumed.
4. Common Risks in Used Machines
Common risks for used thread rolling machines include roller wear, loss of alignment affecting thread accuracy, and reduced force consistency due to mechanical or drive wear. Tooling availability and condition can significantly influence usability. Absence of control details or calibration records may complicate setup and repeatability.
5. Maintenance and Service Considerations
Maintenance requirements depend on operating history, which is not provided. Regular attention should be given to roller condition, bearings, lubrication systems, and alignment mechanisms. Drive components should be monitored for load stability and thermal behavior. Long-term service planning should consider availability of Escofier-specific tooling, spare parts, and technical documentation.
Final Note:
While operating forces, speeds, and workpiece limits are clearly stated, critical information—such as control system type, automation features, achievable thread tolerances, and service history—is important. These elements should be verified through documentation review and on-machine testing before forming final technical conclusions.
