Linear guides NSK on blow moulding machines

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A leading manufacturer of blow moulding machines has recently replaced its linear guides with the NH series from NSK. Blow moulding machines are used to manufacture hollow objects such as plastic bottles, employing linear guides to move the mould platens. The components are subject to very challenging operation conditions, including fast cycle times and high clamping forces.

The move to NSK linear guides came after the OEM received complaints about the poor service life exhibited by its previous linear guides, which were showing visible signs of wear after just 12 months. The OEM asked NSK for a full assessment and failure cause analysis, and once the investigation was complete NSK discovered that there were some very minor alignment errors made during the assembly of the guides, but that it was not the principal cause of damage to the guides. NSK technicians established indeed that the load factors given by the previous linear guides supplier had been calculated using a method that produced results quite different from the values calculated using industry-standard ISO formulae.

For the NH series, the relevant load factor values are calculated based on ISO standards, which is not always employed for linear guides, but for NSK a comparison made on the ISO standard is the correct method and one that users can also replicate. The NSK NH series offer higher load capacity and very long service life due to their optimized design, especially in case of dynamic stress, overloading, impact loading and shock loading. In the case of the blow moulding machine manufacturer, the switch to NH guides led to a significant reduction in the wear susceptibility of the clamping units. As a result, the OEM has now equipped its entire range of machines with NH series linear guides from NSK.

A growing number of reputable moulding machine manufacturers, as well as builders of machine tools and handling systems for semiconductor production, are benefiting from using NH series linear guides.

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