CNC production
(Computerized Numerical Control)are machine tools which, thanks to the use of modern control technology, are able to automatically produce workpieces with high precision, even for complex shapes. They surpass mechanically controlled machines in terms of precision and speed.
In some cases, the data from the CAD programme, which is usually used to design the components, can be converted into a CNC programme using a post-processor, taking into account a number of other factors such as tool diameter, speeds, feed rates, etc. In addition to the manual input of control information, there is also the so-called teach-in method, which is available for a small number of suitable CNC machines, and workshop programming with input masks.
For training purposes, we have software from Keller that allows us to practise the DIN programming of machine tools (turning and milling) and also to simulate programmed machining operations.
CNC milling
In CNC milling, up to 5-axis machines can be programmed via a machine control system. The axes are controlled individually or simultaneously with feeds. The traverse paths are measured by glass measuring strips. A distinction is made between incremental and absolute path measuring systems.CNC milling machines sometimes run at extreme feed rates of 60 m/min and speeds of 100,000 rpm, although the values are usually significantly lower. The tools are stored in a tool changer magazine, automatically called up when required and changed by a tool changer.
CNC technology enables 3D milling, with which more complicated 3D contours can be created. The workpiece is often travelled in many small adjacent lines.
With 5-axis milling, the machine can position and move the milling cutter at any angle on the workpiece, enabling the production of extremely complex 3D contours. The characteristics of a milling machine are the workspace coordinates, i.e. which travel paths are possible in the X, Y and Z coordinates, which drive power and which speed ranges are available. We have two CNC-controlled machines from Hermle at our disposal for milling work.
Hermele U630S
The U 630 S universal milling and drilling machine from Hermle Gosheim was purchased in 1998. The control (Heidenhain TNC 410) of this machine enables programming according to DIN/ISO and alternatively according to Heidenhain cycles.
Working range / load / travel:
- Longitudinal X-axis: 875 mm Vertical spindle
- Longitudinal X-axis: 630 mm Horizontal spindle
- Transverse Y-axis: 500 mm
- Vertical Z-axis: 500 mm
- Angled table load: 400 kg
- Maximum clamping area: 900 x 528 mm
Hermle B 300
The B300 machining centre from Hermle was purchased at the end of 2009. The machine has a magazine with 30 tool positions. The swivelling axis with integrated rotary table makes it possible to machine workpieces simultaneously on 5 sides.
Working range / load / travel:
- X-axis: 800 mm
- Y-axis: 600 mm
- Z-axis: 500 mm
- A-axis/Swivelling axis: +/-110°
- C-axis/Rotary axis: 360°
- Table load: 250 kg
- Spindle speed: 15,000 1/min
Hermele c12u
A new addition is the c12 from Hermle Gosheim. It was purchased by the DPZ in 2017. It is designed for machining cubic parts weighing up to 100 kg and is in no way inferior to the larger models. In addition to its compactness, the focus is also on Hermle's core competences such as precision, durability and, of course, dynamics. Designed as a 5-axis machining centre with different speed ranges and various interfaces, the right speed is available for practically every application. Hermle's patented collision protection for spindles up to 18000 rpm has also been integrated.
The tool magazine holds up to 36 tools and can be expanded to 71 tools in the double expansion stage.
Working range / load / travel:
- X-axis travel 350 mm
- Y-axis: 440 mm
- Z-axis: 330 mm
- Rapid traverse linear (dynamic) X-Y-Z: 30 (50) m/min
- Linear acceleration (dynamic) X-Y-Z: 4 (8) m/s²
- Linear feed force X-Y-Z: 3000 N
- Jaw width max.: 430 mm
- Workpiece diameter max.: Ø 320 mm
- Workpiece height max.: 265 mm
Tool presetting
Since 2008, we have been using a ZOLLER ?smile 400/pilot 3 tool presetting and measuring machine to determine tool data (tool length, diameters and geometry). This enables us to record tool data and take it into account when creating programmes on the CNC machines.
Shrinking technology
The "powerShrink" inductive shrink unit from Zoller enables us to realise very accurate tools. The use of slim, long shrink-fit holders enables us to plunge deep into workpiece geometries and machine them without collision.
CNC turning
In classic turning, mainly rotationally symmetrical (round) parts are machined. The modern technology of a CNC lathe makes it possible to manufacture workpieces that could previously only be produced on a milling machine.We have two cycle-controlled lathes in use in our precision engineering workshop.
Advantages of cycle-controlled precision lathes:
- Fast realisation from the drawing to the finished workpiece
- Optimum ergonomics and accessibility for the operator
- Shortest set-up times
- Generously dimensioned workspaces with minimal space requirements
- Toolmaking accuracy according to DIN 8605
Weiler E30
The E 30 precision lathe with automatic cycle control from Weiler was purchased in 2024. The control system enables contour-compliant machining of turned workpieces via cycles. In addition to cycle machining, programming according to DIN/ISO is possible on this machine.
Working range / load / travel:
- Centre distance: 750 mm
- max. circulation diameter over bed: 330 mm
- max. circulation diameter over cross slide: 160 mm
DMT CD650
The DMT CD 650 was purchased in 2014. It is equipped with a Heidenhain Manual plus 620 HSCI control system.
Working range / load / travel:
- Max. circulation diameter over bed 650 mm
- Max. circulation diameter over cross slide 420 mm
- Centre distance: 2000 mm
- Spindle bore/chuck passage 106 mm
- max. workpiece weight: 600 kg