HYDRAULIC CYLINDERS

- FRICTION WELDING - HYDRAULIC CYLINDERS - FRICTION WELDING OF THE BOTTOM -
- FRICTION WELDING OF THE COLLAR - TEST BENCH -

 

SCAGLIA’s FRICTION WELDING

Scaglia S.p.A. has been dealing with the Friction Welding process since 1979 to manufacture light alloy bobbins for yarn twisting machines. Year after year this process has been improved and extended to other products i.e. shafts and other industrial machinery parts, and now the Company has a great in-depth knowledge in the welding of different kinds of materials (aluminium alloys, titanium, stainless steel and steel alloys).

Friction welding has become widely utilized due to the many advantages that this process guarantees, such as production cost reduction, energy saving, quality improvement, top reliability and great precision of all the joints.


 
Friction welded piston rod with the characteristic “flash”

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SCAGLIA’s HYDRAULIC CYLINDERS

Scaglia S.p.A. is a new entrant in the production of hydraulic cylinders for earthmovers, but has already built profitable relationships with some of the main manufacturers.

After almost two years of research Scaglia S.p.A. has developed and patented a new system (called “SCALITAL”) to friction weld the bottom and the head bush to the sleeve of hydraulic cylinders.

At present Scaglia can manufacture “SCALITAL” hydraulic cylinders of the following sizes:

  • Tube: up to 120 mm (internal diameter) x 10 mm (wall thickness)
  • Piston rod: up to a diameter of 70 mm

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FRICTION WELDING OF THE BOTTOM

Scaglia S.p.A. has created an innovative way to weld the bottom to the sleeve of hydraulic cylinders, which can guarantee outstanding performance and constant results.

Thanks to our know-how in friction welding, we have specially designed the cylinder bottom to gain considerable improvements and advantages on the finished product.

Our patented bottom ends with a shaped lip, which is pressed against the wall of the sleeve during the friction welding process.

Such system guarantees two main advantages: 

  • the lip closed against the sleeve creates a tight sealing which protects the hydraulic fluid against contaminations from wastes of the welding flash;
  • thanks to the diagonal welding the welding surface is increased of about 18%, thus enhancing the resistance of the joint.


 

This “SCALITAL” system has passed all the most demanding tests.

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FRICTION WELDING OF THE COLLAR

Scaglia S.p.A. has also patented a new way to fasten the head bush on to the sleeve of the cylinder, by welding a “collar” to the sleeve using Friction Welding technology. This system, which is illustrated in the two pictures here below, can guarantee a safer and more durable joint.

  1. Blind threaded hole.
  2. Open threaded hole, intersecting the welding flash, which can work as a self-locking system for the screw.

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TEST BENCH

Scaglia owns a special test bench enabling to check the resistance of welding.

A standard endurance test implies 150,000 complete cycles, during which hydraulic cylinders are subject to an operating pressure 1.6 times higher than the one requested by the Customer.

The size of Scaglia’s bench allows to test one cylinder at a time with bore up to 150 mm (or two at a time with bore up to 80 mm) and length up to 3000 mm, and with pressures up to 500 bar.

   

This picture shows Scaglia’s Test Bench during a comparative test between two cylinders.

  • The test data can be recorded and printed via a Personal Computer connected to the Bench.

 

  • Test times and their relevant pressures can be modified in every moment.

 

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