Application and Use
The 7627 is the latest generation of the HEGENSCHEIDT deep rolling machines for the machining of railway axles and other long components, for example in the aircraft, automotive, con-
struction and agricultural machinery industries. The specialized machine, which is designed to the requirements of the market, offers an economical, energy- and resource-saving process for
increasing the fatigue strength of components and especially of wheelset axles.
This HEGENSCHEIDT machine is a the result of the long term experience in the field of rolling technology and impresses with a well-thought-out machine concept, simultaneous processing with up to 3 slides, low energy consumption, a simple clamping system and fully automatic operation. Workpieces up to 2,800 mm in length and 400 mm in diameter can be automatically machined.
Function
he different mechanisms of the process (smoothing, hardening and residual stress formation) lead to multiple material and component improvements that make the rolled shafts more resistant to stresses during operation. The purely mechanical forming process with a small effective zone eliminates residual tensile stresses from the shaft manufacturing process, for example, and leaves residual compressive stresses up to a depth of 5-8 mm. The increase in surface hardness reduces the risk of foreign object damage, reduces susceptibility to cracking and increases corrosion resistance. A longer service life, increased inspection intervals and a higher load capacity of the shafts are the relevant benefits from the user's point of view.
Highlights of the 7627
Machine specification
| Machine data | |
| Machine dimensions (L x W x H) | 7,050 mm x 3,100 mm x 2,660 mm |
| Machine weight | 18 t |
| General specification | |
| Speed main drive | 0 ... 330 min-1 |
| Drive power 100% ED | 12 kW (optionally 24 kW via 2 drives) |
| Torque on workpiece | 325 Nm (optional 2x 325 via 2 drives) |
| Feed force X-axis, max. | 50 kN |
| Lifting force Y-axis prism (hydraulic), max. | 25 kN |
| Deep rolling force | 5 ... 50 kN (reduction to 3...37 kN possible) |
| Deep rolling swivel angle | +/-90° (at full rolling force) |
| Deep rolling roller diameter | 100 ... 159 mm |
| Tool changing stations (optional) | 16, (4 tools per cylinder with 4 cylinders) |
| Measuring system in the machine | metric |
| Technical utilization rate (availability) | 95% (according to VDI 3423) |
| Control system | Siemens SINUMERIK ONE |
| Workpiece data | |
| Workpiece diameter, min. | 100 mm (smaller possible) |
| Workpiece diameter, max. | 400 mm |
| Workpiece length, max. | 2,800 mm |
| Workpiece weight, max. | 1 t |
| Workpiece material | steel |
| Center point angle | 75°, 60°, 90° or according to customer requirements |
| Torque transmission workpiece | Friction disc* |
| Accuracies | |
| Roughness Rz before rolling | after rolling (typical) | ~ 20µm | ~ 3.5µm |
| Realizable roughness after rolling | 0.8 µm |
| Roughness improvement | 40 ... 80 % (depending on rolling pressure) |
| Increase in surface strength | up to 45 % EA | up to 25 % EA4 |
| Residual compressive stress surface | -400 ... -600 MPa |
| Residual compressive stress 2 mm (typical) depth | -300 ... - 400 MPa |
* Similar axles can be clamped with the same combination of friction disc and centerpoint without downtime.
Our Services
We adhere to the principles of competence, speed, and professionalism in order to provide you with the best possible support for your daily work. As a reliable and globally positioned partner, we support your company and your machine throughout their entire life cycle. We are committed to ensuring your productivity, coupled with the fastest response times and maximum machine availability. This is why HEGENSCHEIDT machines and services are perfectly matched. We provide uncomplicated and fast support for necessary repairs, replacement parts, services, or technical questions. Our range of services and support at the highest technical level is clearly structured and comprehensive.
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