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Versatility With Multi-Spindle Machine Tools

Successful integration of multispindle CNC is changing the justification equation for shops currently using CNC single spindles.

Versatility With Multi-Spindle Machine Tools

Where high flexibility and autonomy in machining operations are required, an automotive manufacturer has found multi-spindle machine tools to be a versatile addition. By Brice Renggli, marketing manager, Tornos

Manufacturer Joseph Martin was founded in 1946, and specialises in bar turning and high-precision sub-assemblies. It produces mainly for the automotive industry, especially in the field of fluid regulation technology for pressures between 10 mbar and 3,000 bar. In particular, their parts are used for fuel or diesel injection systems, transmission modules, emission control systems (exhaust gas recirculation and selective catalytic reduction) or suspension systems.

Multispindle units often have time left over to further increase their profitability by taking on more business without additional investment in equipment or operation-related costs

Multispindle units often have time left over to further increase their profitability by taking on more business without additional investment in equipment or operation-related costs.

The company has invested in machinery ranging from single-spindle and cam-type machines to CNC type multi-spindle machines. Today, it has around 40 cam-type multi-spindle machines, 25 CNC multi-spindle machines and 16 CNC single-spindle lathes.

 

Machining Different Materials

The assortment of machines enables the company to machine materials such as stainless steels (304L, 316L, heat-resistant steels), bearing steel (100Cr6), titanium, FeNi and FeSi.

Through its methods department, the company advises its customers on the optimisation of the production of their parts. The company’s research and development department designs specific attachments for its machines to tackle challenges. Such specific devices are also machined on its 5-axis machining centres. Two machines, for instance, are equipped with a billet loading system using a vibratory feeder, otherwise known as a “chucker” solution.

 

Adopting Newer Processes

The company is placing importance to high flexibility and autonomy in its production, such as adopting part machining processes and customised part deburring and multi-stage washing procedures.

Besides its machining capabilities, the company provides assembly and sub-assembly services as well as laser welding and drilling processes for its customers.

The total number of operations needed to complete a part are divided among the number of spindles

The total number of operations needed to complete a part are divided among the number of spindles.

The company has also added a MultiSwiss XL project from Tornos, comprising two machine types called 6×32 and 8×26, with the latter having two supplementary spindles and a machining capacity that came closer to their product requirements. The hydrostatic bearing technology also provided the company a higher level of surface finish. The machine was also for designed large diameters.

“We opted for a quick-change tooling system to further accelerate the tool changing process that is already very fast due to the use of standard tool holders.” said Laurent Martin, the company’s chief executive officer. The driven tools are operated through a motor that is integrated in the tool holders; no belts or gears are required and a socket enables tool loading. With its tool blocks, the machine can be equipped with up to four tools, two of them being driven tools.

 

Future Module

The machine is 9 m long, but components such as the oil tank, chip conveyor, water chiller, bar loader, stacker, high-pressure units and filter units are contained in the basic footprint.

In the market, the demand for secondary machining on various workpieces is becoming increasingly important. With access to the machining area, the machine permits the set-up of a future loading module.

 

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