Surface International, a Jodhpur-based manufacturer of shot blasting and peening machines with global presence has introduced multi indexing hanger-type shot peening machine.

Shot peening is a process specifically designed to enhance the fatigue strength of components which are subject to high alternating stress. Surface treatment procedures like grinding, milling, bending or heat treatment procedures cause tensile residual stress. This tensile residual stress leads to low life cycles of the parts. Shot peening converts tensile residual stress into compressive residual stress which leads to significant increases in the life cycle of parts and their maximum load capacities.

Multi indexing hanger type shot peening machine is especially suitable for automation of tractor industry for shot peening of big gears and gear shafts. The shot peening intensity of 0.7 mm on ‘A’ almen strips are attained in 3-minute cycle. Entire cabinet and hanger are manufactured with Mn Steel to protect front wear and abrasion thus gives a long life to the machine. The machine is suitable for a hanger drum of Size ø 400 mm x 1,200 mm. Four such Mn hangers are provided on an indexing hanger module of ø1,500 mm. One hanger is at loading and unloading station while the hanger opposite to loading unloading station is the shot peening station. Balance two stations are idle and air wash station. The machine is provided with three blast wheel strategically placed to cover the defined hanger size of 1,200 mm length and 400 mm diameter. Each blast wheel is powered by 15 HP motor and fires 10 tonnes shots per hour per wheel. All the blast wheels are provided with variable AC drive to control the shot velocity while peening. The hanger rotation is also provided with variable AC drive to control rotation of the hanger.

Matching shot recovery system is provided with screw conveyor, bucket elevator, rotary screen separator, vibratory classifier with sensors to give feedback of precise working of each application. The machine has an intelligent PLC controlling system where the shot flow rate of each blast wheel is permitted in a given bandwidth. Alarms are generated if shot flow rate is less or more than the pre set limits. The shot peening machine is programmed for recipe. Once the recipe number is selected, all set parameters like BW speed, hanger RPM peening time will be automatically selected by the PLC. A touch screen user-friendly HMI is provided with the machine to display various parameters and operation being run on the machine.