Case History: hollow shaft
Hollow shaft in EN-GJS500-7 spheroidal graphite iron for car wheel balancers
In which industries is the hollow shaft mostly used?
Benefits (in terms of quality and quantity) of spheroidal graphite iron compared to steel
-8.3% weight of the final component
Minimum impact on machinability
Less waste material (-82.3% weight of the raw part)
Reduction in costs
Increase in performance
Development of the application for the Corghi brand wheel balancers of the Nexon group
The problem to solve and the solution in GJS “EN-GJS-500-7” spheroidal graphite iron
In light of these production inefficiencies, Nexion S.p.A. decided to optimise the production process by obtaining a raw component that resembled as closely as possible the final shape of the product after machining (net-to-shape), with adequate tensile strength to withstand the loads involved. Before opting for the solution in spheroidal graphite iron, the customer had also considered the possibility of producing the shaft in two steel parts.
Thanks, however, to the natural casting capacity of spheroidal graphite iron to obtain a net-to-shape cast part and the possibility of using a core to make the internal through hole, the solution of producing the hollow shaft in EN-GJS-500-7 spheroidal graphite iron proved to be the best option. It was thus possible to reduce the amount of machining required to obtain the final shape, resulting in a significant economic benefit for the customer.
The benefits obtained by producing a hollow shaft in spheroidal graphite iron
The new solution assessed to achieve the goal
The customer’s goals were the following:
- To cut production costs of the steel component (economic saving)
- To reduce material waste (material removed during machining)
- To retain the same mechanical performance