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Ground ball screws, linear roller guides and super-precision ball bearings from NSK are helping Imsa to consolidate its position in the field of specialised deep-hole drilling machines, which are particularly popular for mould-making applications in the automotive sector.
Deep-hole drilling is a complex machining operation due to the absolute precision and productivity required by today's market, particularly (but not exclusively) in the automotive mould-making industry. The moulds used for the manufacture of medium and large-sized plastic components require deep-hole drilling to create long and precise cooling ducts, some measuring up to 1500 mm and beyond.
Imsa is an Italian company that has become a leader in specialised machining centres for deep-hole drilling. Over more than 30 years of activity, the company has introduced numerous technical innovations which, besides consolidating its position, have led to the installation of more than 500 machines that are currently operating in Italy and the rest of the European Union, as well as Canada, the USA, Brazil and Mexico. The company has a particularly significant market share in the automotive mould-making sector.
Imsa has always been able to anticipate market needs by providing its customers with new concepts capable of making a quantum leap in the performance and productivity of deep-hole drilling. These include its exclusive autofocus system for the optimal movement of steady rests developed as far back as 1996, and the concept of independent axes for drilling and milling, which arrived the following year. In 2000, Imsa unveiled a vertical gantry structure for the column that provides 16 times more rigidity than traditional solutions.
The evolution of Imsa's deep-hole drilling machines continued with the introduction of a milling head changer, which for the first time made it possible to exchange the gun-drill head without operator intervention. The company also released its ‘Swing on Top’ switching system, which allows both deep-hole drilling and milling operations to use the same spindle.
Imsa has integrated powerful liquid-cooled electro-spindles into its latest top-of-the-range EVO series, both to improve productivity in deep-hole drilling and ensure high-level milling before and after drilling of the mould conditioning circuit.
“Our partners have always played a fundamental role in all of the technological innovations that distinguish our company,” says Marco Colombo, Head of Technical Department at Imsa. “In order to put our design ideas into practice, we use top-quality components that can guarantee the best performance and reliability over time. For example, NSK has always been our point of reference in motion control throughout the evolution of our machines. The availability of optimal-quality NSK bearings, ball screws and linear guides has allowed us to build the highest performance machines in our sector.”
One of Imsa’s most recent innovations has been the development of a rotary-tilting table, which allows the machining of moulds in five axes using just one clamping position, further reducing manufacturing time. MF1000-3T EVO, a deep-hole drilling machine for small to medium automotive moulds up to 2.5 tonnes in weight, is the first model to be equipped with this solution.
Colombo explains: "For this specific application we created a single-head machine with one HSK63A electro-spindle [200 Nm], combined with three deep-hole drilling heads featuring automatic head change and an 80-position automatic tool changer. In addition, the MF1000-3T EVO is supported by an automation system of our own design for the two-station pallet changer [expandable to six], which allows the customer to carry out complete machining operations of considerable complexity with minimum downtime and long unmanned cycles.”
Here too, Imsa is using NSK's latest-generation solutions to achieve the very high performance required, even in a relatively small machine.
"To transform axial movement into rotary movement, we use two 63 mm diameter NSK ZSS series ground ball screws,” says Colombo. “Compared with the ball screws of previous generations, they guarantee greater rigidity and perform better in terms of speed and load capacity. As a result, the machine's working axes can move at feed rates of up to 30 m/min. This is just one of many examples of how the components we choose in collaboration with NSK's technical specialists enable us to achieve our ambitious targets."
Another NSK product family that is extremely important for Imsa-designed machines is RA series roller guides, which represent the ultimate in rigidity, load capacity and precision. Their ‘caged roller’ construction technology ensures smooth and silent running, and prevents the rollers from crossing to totally eliminate the risk of damage or premature failure. The roller guides, together with NSK ball screws, are the heart of a solution that guarantees rigid movement in Imsa’s machines.
The collaboration between IMSA and NSK is long-standing and reinforced by the constant interaction between the Italian company's designers and the specialists of NSK's local support team.
"In all these years of cooperation we have seen that NSK’s ball screws are the world’s finest,” states Colombo. “A well-dimensioned ball screw from NSK is practically eternal, so we’re delighted to continue this successful partnership. In addition, we appreciate the company's ability to be very flexible; local NSK staff are always available to meet our particular needs at short notice. We often order bespoke products, such as custom-length or twin ball screws, which are essential to ensure the best mechanical performance of our gantry structure. We particularly appreciate flexibility in delivery."
From high-precision ball bearings to roller bearings; from linear guides with automatic lubrication systems to heavy-duty ball screws; there is no product in the NSK catalogue that the designers at Imsa have not carefully considered.
Concludes Colombo: "What’s most important is the common vision of the two companies: to introduce added value to the machines in terms of performance and durability. In this way, we achieve our objective: to meet the expectations of our customers and keep them coming back with any new project their market requires, in the spirit of long-term collaboration.”
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