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Autovite, this new solution designed by Fiam takes just 36 seconds to demonstrate its absolute accuracy, top quality and very high productivity. Made to satisfy the need to tighten 12 self-threading screws on the backrests of plastic seats, the product is suitable for all automatic assembly operations. This is because when self-threading screws are tightened, their construction needs an adequate axial thrust to form the thread inside the component. Fiam has therefore designed and made a tightening unit with one spindle and automatic screw feed.
Discover the advantages offered by this Fiam solution
High production rate
The whole work cycle, from start to stop, is accomplished in 36 seconds giving an immediate return on your investment
Complete automation of the tightening operation
Almost all the work by the operator has been done away with, reducing user fatigue to a minimum. The machine is fitted with polycarbonate guards and photoelectric cells for operator safety throughout the work cycle
Very high tightening accuracy and repeatability
The system ensures constant and continuous control of all assembly operations: the result is therefore a reliable and correctly tightened product; in other words a product with quality that can be certificated
The unit in detail
Made with a bearing structure complete with assembly support and accident prevention protective systems in polycarbonate, the unit comprises:
Chuck assembly template
The template is designed according to the dimensions of the piece to be assembled. It is extremely lightweight and placed on a working area that allows the operator to position and remove the workpiece easily. The chuck template is moved electrically along the Y axis along pre-set coordinates.
Screw feeding unit, positioned on relative plate
This includes a circular feeder and one way high speed screw selection unit.. The system is also fitted with an “overflow” control device, which uses optic fibre to improve the constancy of screw feeding, thereby avoiding jamming and machine shutdown.
“Light” fastening slide
Mounted on the linear X axis, it runs on ball recirculating runners complete with magnetic cylinders limit switch position sensors and hydraulic decelerators. The slide comes complete with screw-retaining head.
The slide houses a MCZ type air nutrunner motor for tightening operations with Jointech Plus torque control system with automatic air shut-off.
Pneumatic system with Festo parts
Electrical system with PLC SIEMENS S7- 200
The many diagnostic options include:
- Green indicator light (piece OK)
- Red indicator light (piece NOT OK)
- Yellow indicator light (malfunction)
- buttons for emergency, clean head, screw loading
The machine is also fitted with a liquid crystal keypad for managing pre-settable work times and to display malfunctions
The work cycle is as follows
1 . The operator positions the workpiece by hand on the relative assembly template
2 . Upon detecting the presence of the workpiece, the machine receives the START from the operator and the tightening cycle then starts automatically
3. The assembly template travels along the Y axis while the slide travels along the X axis, covering a work area of approx. 500 x 500 mm. The slide descends vertically along the Z axis to carry out tightening operations at various points on the component
4. The machine indicates the results of the tightening operations through the indicator lights; malfunctions, indicated by the yellow light, are specified on the keypad liquid crystal display
5. The operator takes out the workpiece and puts in another one for a new tightening cycle
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