The endurance and service life of coil springs such as valve springs or small compression springs can be increased significantly through the process of shot peening. The DISA throughfeed blast principle is economic, process-safe and suitable for high-performance automatic production lines. The shot blast principle can also be used for the removal of scale- and rust from wire, bar and profiles prior to further processing.
Process-safe shot peening of valve and small pressure springs with the new DISA RDS MINI
Coil springs, such as suspension springs, valve springs or small pressure springs, are typical work pieces whose endurance and service life is significantly increased by shot peening. Small metal work pieces (valve and pressure springs) can in fact be shot peened in bulk on trough-shaped barrel belts, however, this method does not provide process safety as nowadays often required.
A specific feature of the RDS Shot Peening System is its ability to handle coil springs in a wide range of dimensions including small parts and to treat them individually under uniform and defined conditions in a continuous process. With suitably adapted loading and unloading devices, the shot peening process can be integrated into continuous production lines.
DISA RDS-MINI Shot Peening System
Operating principle
In RDS-Mini Shot Peening Systems, continuously rotating, single work pieces travel on horizontal rollers through the machine. The machines are designed to strengthen valve springs and suspension springs by shot peening at a throughput rate of more than 5,000 springs an hour, depending on relevant requirements.
The springs are fed to the machine individually on a straight-line conveyor or other loading systems and then move through the blasting zone on continuously rotating horizontal rollers. Axial movements are effected by cams attached to chains.
Inside the blasting zone the springs are properly guided by adjustable baffle plates which also serve to focus the shot stream on the work pieces for optimal exposure within the “hot spot” of the blast pattern. The parameters of the shot peening process, such as shot quantity, blast wheel speed/throwing velocity, the speed at which the work pieces rotate and the dwell time, can all be regulated to suit the requirements of a specific type of work piece. It is this definition of all treatment parameters that ensures process-safety at all times. Process parameters can be recorded in the control system and retrieved when necessary.
When used for processing coil springs such as valve
and small pressure springs, the DISA RDS-MINI Shot
Peening System provides the following benefits:
Shot peening based on the throughput principle is simple and process-safe, suitable for automatic production lines with a continuous work piece flow without intermediate storage.
Individually adjustable parameters ensure work piece-specific shot peening of the desired quality.
Automatic systems of high performance and manufacturing consistency reduce production costs.
A solid machine structure and high-quality machine components ensure long service life and low maintenance costs.
SHOT BLAST MACHINES FOR WIRE DESCALING
Semi-finished or finished steel products must all be free of scale, rust or other contaminants before further processing. For this purpose, it is necessary to clean the surface of the material. Today's modern production technology would be inconceivable without shot blasting for the treatment of metal surfaces. Shot blasting is a reliable and proven method offering decisive economical and ecological advantages.
DISA shot blast machine for wire and bar descaling
The descaling of wire bar and profiles can take place in different ways, today mostly in the:
Wire and bar material in commercially available qualities and diameters (round, square, hexagonal, flat) in the envelope circle range of 5 – 130 mm are fed past the blasting machine over straightening and drive mechanisms. The arrangement of the blast wheels along the longitudinal axis and in various positions along the blasting compartment ensures an optimal descaling effect.
The large selection of blasting machines covers all requirements and throughput speeds. These depend on the form of scales, the material quality, form of the work piece and on the required degree of cleanliness.
Single strand longitudinal principle
DISA blasting machines are high-performance universal machines. Designed as 3, 4 or 6-wheel shot blast systems, they meet the most varied demands. They can be ideally tailored to the customer’s immediate requirements. This makes them exceptionally integration-capable, so that they can be used either as single machines for autonomous production tasks and, equally as well, in modern steel drawing lines with drawing speeds up to 240 m/min. Guide elements ensure the fault-free passage of wire and bars through the blasting zone. Furthermore, the systems are equipped with blasting guide plates, which offer decisive advantages.
Each impeller blasts into an adjustable pair of blasting guide plates, which can be simply set in a matter of seconds to the different wire or bar cross-sections. The use of the guide plates gives a better shot coverage of the work piece to be blast-cleaned, a direct result of the intensified blasting concentration.
Benefits:
Machines with 3, 4 or 6 blast wheels
Drawing speed up to 240 m/min
Enveloping circle diameter of 5 - 55 mm for wire and up to 130 mm for bars
Easy to integrate into modern drawing lines or to be used as stand-alone machines for autonomous finishing
Modern shot blast technology, high descaling efficiency
Maximum energy utilization by use of adjustable abrasive stream guide plates
Hans Jörg Stoll
DISA Industrie AG
Schaffhausen, Switzerland