Our Manufacturing Process
Manufacturing Process
Frequent refining of design based on customer feedbacks and sea trials, give rise to fuel efficient propellers with better durability and performance characteristics.
Design and
Pattern Making
Moulding and
Casting
Quality Control
Machining
Grinding and
Polishing
Service and
Maintenance
SR PROPELLERS
Manufacturing Operations
At SR Propellers, we always look for new ways to use our expertise as a marine propeller manufacturer, promote innovation and discover new opportunities around the world. Our ambition is to become the world's most efficient marine manufacturer and service provider.
We have a 1 tonne capacity furnace for non-ferrous castings mainly Manganese Bronze, Gunmetal, Nickel Aluminium Bronze, Aluminium, Aluminium Bronze, Zinc, Phosphorous Bronze. Our foundry is equipped with advanced and latest equipment’s for the better monitoring of moulding, melting, pouring and casting. We have a well-equipped machine shop. We have the assistance of NABL approved lab for the Metallurgical and Mechanical tests combined with other in-house facilities for Quality control. Our well qualified and experienced personnel’s and expertized design wing combined with the in-house facilities, make way for the top class products to meet the customer requirement, to their satisfaction.
"We offer our clients the finest quality products with great performance characteristics by using the the most advanced technology, precision machineries and expertise."
- Sheron JohnsonTechnical Director
QUALITY IN EVERY STEP
Design
The specifications of boats and Engine details will be collected from clients and that data will be our input for design calculations. The optimum design would be finalized with respect to the theoretical aspects as well as practical. Then autocad drawings will be generated accordingly.
Pattern Making
Once the drawing is ready, patterns would be made from wood as per the drawings providing required shrinkage and machining allowances. Propeller patterns would be checked thoroughly by using pitchometer. Smooth surface will be generated for smooth castings.
Moulding
Using the patterns the sand moulds will be generated in metal mould boxes by sufficient ramming. Co2 gas will be fed into the moulds for mould strengthening. Highly skilled foundry men are there to produce top quality moulds with fine-tuned runner and riser design for better castings. Special measures would be taken for castings without blowholes, porosity, slag inclusions and other imperfections.
Casting
Once the moulds are ready, alloy metal ingots will be melted in the oil fired tilting crucible furnace to the melting point. The molten metal will be taken in a secondary crucible when it reaches the melting point using the tilting system. Then the molten metal will be poured into the moulds to form metal casts, thereafter leaving the metal to get solidified at room temperature. The fumes and smoke from the furnace will be exhausted out through hood and chimney system.
Quality control
The castings will be inspected thoroughly for defects. Dye penetrant and Ultrasonic testings would be done if required. Castings would be either accepted or rejected according to the criteria.
Machining
The casts as well as the stainless steel and Mild steel raw shafts, tubes and plates will be taken for undergoing operations such as machining, drilling, shaping, milling, welding, grinding. Then buffing will be done for smooth metal surfaces on every products. Propellers would be checked by using pitchometer and pitch corrections would be made in tolerance level. Blade templates, blade section gauges are used for checking and fine-tuning the blade profiles.
Grinding & Polishing
Highly skilled labourers are there to provide smooth blade surfaces with accurate pitch distributions. Polishing and texturing would be done in varieties according to the series of propellers.
Service & Maintenance
We are well equipped with the advanced facilities for the repair of damaged propeller and propeller shafts. We do pitch correction,reshaping and brazing of damaged propellers.