A leading manufacturer of blow moulding machines has recently replaced its linear guides with the NH series from NSK. The move comes after the OEM received complaints about the poor service life exhibited by its previous linear guides, which are used to move the mould platens.
Blow moulding machines, which are used to manufacture hollow objects such as plastic bottles, feature linear guides that are subject to very challenging operating conditions. As a result, service life can be compromised if the optimum linear guide is not selected, as this particular OEM discovered. The manufacturer began receiving complaints from customers who were unhappy that the linear guides were showing visible signs of wear after just 12 months. As blow moulding machines operate with fast cycle times and high clamping forces, any wear to key components such as linear guides can be extremely detrimental to the manufacturing process.
To investigate the situation, the machine manufacturer challenged its existing supplier of linear guides, but was told the wear had resulted from alignment errors. In other words, the supplier was intimating that the OEM had made errors when assembling the linear guides to its machines.
Dissatisfied with this answer, the manufacturer turned to NSK, requesting that the company undertake a full assessment and failure cause analysis. Once the investigation was complete, NSK discovered there were in fact some very minor alignment errors but that these were not the principal cause of damage to the guides. At the same time, NSK technicians established that the load factors given by the linear guide supplier had been calculated using a method which produced results quite different from the values calculated using industry-standard ISO formulae.
The recommendation was made to replace the existing guides with equivalent ones from the NSK NH series, which offer higher load capacity and very long service life due to their optimised design, especially in cases of dynamic stress, overloading, impact loading and shock loading. These effects are often unavoidable in blow moulding systems, so linear guides must be designed accordingly.
For the NH series, the relevant load factor values are calculated based on ISO standards, which is not always the case for linear guides. Very often, values are calculated from tests which have not been made under ISO conditions. The values may appear to be better, but for NSK, a comparison based on the ISO standard is the correct method and one that users can replicate.
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. 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.
IKO MX Series Shall Involve Dust-Protection in Specific Conditions
IKO International is building on its standard MX series of linear roller bearings to include special features for environments that are sensitive to metal chips, dust, and other contaminants.
A dust protective C-Wiper can be mounted to the outside of the end seal, ensuring operation in environments where metal chips are spattering. After 1,000 km of operation, the C-Wiper prevented foreign substances from entering the slide unit with no damage to the end seal.
The MX specification integrates IKO’s proprietary C-Lube lubrication system. As the cylindrical rollers circulate, lubricant is distributed to the loading area through the rollers along the track rail. Lubrication is properly maintained in the loading area for over 12,500 miles, reducing valuable time spent lubricating hard to reach parts.
High load capacity
The MX models utilize rows of cylindrical rollers to provide a greater contact area than slides that use steel balls. They also maintain high rigidity in every direction. As a result, bearings deliver high load capacities––up to 674 kN for dynamic loads and 1,300 kN for static loads.
Mounting dimensions are compatible with MH and LWH ball type series. If you want to transition from a ball type to a roller type, your mounting dimensions do not need to change.
A new lease of life for your STUDER machine with a machine overhaul
FRITZ STUDER AG, Motion Meeting Press Event
Anything that works as hard as a cylindrical grinding machine will wear out. This is particularly obvious in the geometry and precision. STUDER doesn’t just support the customer in the purchase of new machines, but can also offer a complete machine overhaul A machine overhaul at STUDER makes an old machine into one that is as good as new; in other words, a machine that has the same tolerances as when it was first delivered.
STUDER has been carrying out machine overhauls for 20 years. Every day, more than 25 employees are involved in giving machines and assemblies a new lease of life. In the supreme discipline of machine overhauls, over 400 machines have been completely overhauled to date. Countless assemblies have also been overhauled. Irrespective of whether machine or assembly, they all have one thing in common: An overhaul at STUDER is carried out by the original manufacturer with its unique knowledge and expertise, and according to the same quality standards as for new machines. At the end the customer gets a product whose quality and precision are comparable to that of a new machine.
Trusted precision and quality
A machine overhaul fully restores the original precision and quality and verifies this by means of a certificate. Changing requirements such as reconfigurations, automation or even digitalization can also be implemented in conjunction with the overhaul.
Thanks to the STUDER quality, the customer receives a new one-year warranty on the overhaul. This also includes ensuring parts availability again. As the machine is ultimately restored to the original condition, an overhaul provides the customer with an outstanding price/performance ratio compared to the former purchase price. STUDER can provide the customer with a specific loan machine for the duration of the machine overhaul if required.
Machine overhaul at a glance
- Machine base: Completely overhauled, ribbed guideways milled, recast and repainted.
- Control cabinet: Replacement of wear parts in the electric cabinet.
- Pneumatics: New valves, hoses and filters.
- Hydraulics: New hydraulic and lubricating system, all new valves and hoses.
- Workhead: Completely overhauled.
- Wheelhead: Completely overhauled.
- Tailstock: Completely overhauled.
- Axes: Tables as new, installation of new recirculating ball screw and bearings.
- Component casings: Sand-blasted, repainted, color according to STUDER design or customer requirement.
- Control system: Existing control system is retained.
- Delivery: Always with precise measurement of new machine tolerance including test certificates.
- Loan machine: We can provide a loan machine on request.
- Renewed original CE certificate
STUDER universal external grinding machines at a glance
FRITZ STUDER AG performing spectacular press event in Thun
A great deal has been written about the new favorit, S33 and S31 machines in recent months. The complete portfolio of STUDER universal external cylindrical grinding machines is presented in more detail in the following report.
From the entry-level machine for the main applications through to the all-rounder for complex grinding tasks. Small to large workpieces for individual, small-batch and large-scale production. With distances between centers of 400, 650, 1000 and 1600 mm and center heights of 175, 225 and 275 mm, STUDER offers the customer a selection of five universal cylindrical grinding machines.
favoritCNC – The well-known bestseller for the main applications
The favoritCNC is a CNC universal cylindrical grinding machine for the individual and batch production of medium-sized workpieces. It has distances between centers of 650 / 1000 mm and a center height of 175 mm. It can machine workpieces with a maximum weight of 80 / 120 kg. It can subsequently be easily adapted to other grinding tasks using various accessory kits such as in-process gauging, balancing system, contact detection and length positioning. The solid Granitan® S103 machine bed forms the basis for this cylindrical grinding machine, which is equipped with high quality components and guarantees maximum precision, performance and reliability over many years. The full enclosure ensures an optimal view of the grinding process.
favorit – The new bestseller for the main applications
The favorit is a CNC universal cylindrical grinding machine for the individual and batch production of short to long workpieces. It has distances between centers of 400 / 650 / 1000 / 1600 mm and a center height of 175 mm. It can machine workpieces with a maximum weight of 150 kg. This cylindrical grinding machine can be used universally and thanks to StuderPictogramming it is quick and easy to program. Its Granitan® S103 mineral casting machine base largely equalizes temporary temperature fluctuations. It can subsequently be easily adapted to other grinding tasks using various accessory kits such as in-process gauging, balancing system, contact detection and length positioning.
S33 – The good value solution for individual requirements
The S33 is a CNC universal cylindrical grinding machine for individual, small-batch and large-scale production of small to large workpieces. It has distances between centers of 400 / 650 / 1000 / 1600 mm and a center height of 175 mm. It can machine workpieces with a maximum weight of 150 kg. It can be changed over from grinding between centers to live grinding in record time. You can grind even complex workpieces in a single clamping: This is made possible by the new wheelhead head with two motor spindles. The foundation is the solid Granitan® S103 machine base.
S31 – The versatile solution for large tasks
The S31 is a cylindrical grinding machine for individual, small-batch and large-scale production of small to large workpieces. It has distances between centers of 400 / 650 / 1000 / 1600 mm and a center height of 175 mm. It can machine workpieces with a maximum weight of 150 kg. Thanks to the expandable modular system the S31 can be precisely adapted to the customers’ requirements. With a high-resolution B-axis of 0.00005°, the swiveling wheelhead enables external, internal, and face grinding in a single clamping. The foundation is the solid Granitan® S103 machine base.
S41 – The all-rounder for complex grinding tasks
The S41 is a CNC universal cylindrical grinding machine for large workpieces. It has distances between centers of 1000 / 1600 mm and center heights of 225 / 275 mm. It can machine workpieces with a maximum weight of 250 kg. The S41 has a host of sophisticated technical features such as the revolutionary StuderGuide® guideway system, high-precision axis drives with linear motors, extremely fast B-axis direct drive, an even wider selection of wheelhead variants and much more.
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