RTM SERIES

Ring cutting machine

The RTM ring cutting machine separates rolled ring-sleeves into individual rings. By using a saw instead of a grooving tool, we have taken ring cutting to the next level.

Our RTM ring cutting machines save between 60 to 90 % of machining time, depending on the ring material.

HIGHLIGHTS

In our RTM ring cutting machines, we have implemented an entirely new machine concept reducing machining times by 60 to 90 %, depending on the ring material, while enhancing the quality of the cut surface dramatically and reducing the reworking effort.

Fitted with specific attachments – a turning module or an ultrasonic testing probe, for example – the machine can be upgraded a full-fledged machining center.

The benefit: rings ready for sale can be produced in one single clamping position.
 

The benefits at a glance

  • Substantial increase in efficiency of material use
  • Significant time savings
  • Excellent plane-parallelism of the rings
  • High surface quality
  • No changing of the clamping position between different machining processes 

Sawing blade replaces grooving tool

Ring sleeves used to be cut into individual rings by grooving on carrousel-type turning lathes. A quite time-consuming process due to the low cutting speed, high tool wear and the need to retract the grooving tool at short intervals for chip removal.  

Especially when producing thin rings, sawing saves between 30 to 50 % of the material. Thanks to the extremely precise operating saw, the very thin blade and the excellent plane-parallelism of the cut rings, machining allowances can be dramatically reduced.

Additionally, non-productive times can be markedly reduced: by more than 40 %, when cutting a sleeve into six rings, for example.

Sawing also means that the material in the kerf is barely heated and the saw blade, in principle, produces a much smoother cut surface. At the same time, the surface of the finished rings provides such a high plane parallelism that practically no mechanical reworking is necessary.

MORE DETAILS

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More efficient material use

Especially when producing thin rings, sawing saves between 30 to 50 % of material.

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More precision

The exceptional precision of the saw ensures utmost plane parallelism of the cut rings. Thanks to the RTM, machining allowances can be reduced significantly.

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More rings

When sawing steel rings, the RTM reduces the cutting time by up to 60 %. When sawing high strength materials, such as titanium or nickel-based alloys, time savings of up to 90 % can be achieved.

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More functions

Various modules can be added to the machine, upgrading it to a full-fledged machining center capable of producing rings ready for sale in just one single clamping position.

Innovation meets proven technology

The main components of the machine are a turntable, on which the ring sleeve is clamped, and a saw that cuts the sleeve into rings. Clamping arms inside the sleeve hold the ring being cut in place – i.e. always the one at the top of the sleeve – and lift it up from the sleeve upon completion of the cutting process. 

With our machines allowances can be significantly reduced thanks to the extremely precise operating saws, the thin cutting blade and the excellent plane parallelism of the cut rings.

A single clamping position for all types of machining  

First the sleeve is positioned on the turntable and clamped. At the top – where the first ring is beeing cut – the sleeve is fixed by means of clamping arms. 

Simultaneously, the outside of the sleeve can be finish-turned and inspected over its entire height. Then sawing of the first ring takes place. As this ring is fixed by the clamping arms, the height of the sawing kerf is held precisely constant throughout the cutting process. Upon completion of the cut, the clamping arms lift the ring from the sleeve for removal.

Afterwards the clamping arms will be lowered to the position of the next ring to be cut.
 

Rings ready for sale

Upgraded to a machining center, the ring cutting machine provides a full host of additional benefits. Fitted with special attachments – and without changing the clamping position – the machine performs many functions that in the past had to be performed in separate steps on different machines. With an RTM the ring producer can bring down non-productive times markedly.

Besides a turning tool holder, the tool unit can accommodate an ultrasonic testing probe as well as drilling or milling heads. With these attachments the sleeve can first be finish-turned, followed by ultrasonic testing of the individual ring segments. This way segments of the sleeve that would be uneconomical to process further can be identified at a very early stage. 

 

The shift from grooving to sawing alone provides tangible benefits in terms of material savings, quality and efficiency improvement as well as cost reduction. On top of it all our machines boost efficiency by enabling a range of other machining operations to occur without changing the clamping position. 

 

Much longer maintenance intervals

A saw blade’s service life is much longer than that of a grooving tool. This is due to the fact that during sawing the stresses are much less concentrated, i.e. the stresses are distributed over numerous saw blade teeth.

Securely clamped

The use of a turntable provides the advantage that the rings can be cut while in a horizontal position. This makes both, loading the sleeve onto the machine and removing the cut rings from it, much safer. Even while the last cut is being performed the ring remains securely fixed. 

Sawing is also generally safer than grooving because it does not produce one single large chip but many small chips, which are immediately removed from the kerf by the saw blade itself.

Upgrade to a machining centre

By adding a turning tool holder, an ultrasonic testing probe as well as drilling and milling heads, the sawing unit can be upgraded to a machining center that produces rings ready to sell in a single clamping position.

Technical data

Min. outside sleeve diameter

mm

Max. outside sleeve diameter

mm

Max. sleeve height

mm

Max. sleeve weight

kN

Max. radial cutting depth

mm

Max. ring weight

kN

Min. ring height

mm

Min. ring height when clamped with “lost” jaws

mm

Contacts

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Antonios Skarlatos

Area Sales Manager

+49 271 401-4184
antonios.skarlatos@dango-dienenthal.de

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Denis Albayrak

Senior Sales Engineer

+49 271 401-4126
denis.albayrak@dango-dienenthal.de

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Normann Blasig

Group Sales Director

+49 271 401-4150
normann.blasig@dango-dienenthal.de

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Normann Blasig

Group Sales Director

+49 271 401-4150
normann.blasig@dango-dienenthal.de

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Normann Blasig

Group Sales Director

+49 271 401-4150
normann.blasig@dango-dienenthal.de

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Tim Haida

Service Manager

+49 271 401 4387
tim.haida@dango-dienenthal.de