Archive | February, 2011

Multi-spindle machines for deep drilling tube plates

Monday, February 14, 2011


The fast development of the nuclear and petrochemical industries and the mechanical industry’s need for machine tools able to drill holes increasingly faster, strengthened the demand for much deeper holes.

Deep hole drilling is the only system that allows the execution of holes, which are ten times longer than their diameter thanks to its high stock removal capacity.

As the components that need to be drilled are becoming larger and the materials more difficult to process, sometimes it is necessary to drill parts that are up to one metre thick. The machines, at the same time, still have to guarantee the same level of accuracy and repeatability.

Successful deep hole drilling requires monitoring the formation of chips, good lubrication and, consequently, appropriate cooling and effective evacuation of chips.

In many cases, it is necessary to drill deep holes with a length more than 100 times their diameter. This requires an extreme level of accuracy when it comes to dimensional tolerances and, subsequently, to surface finishing. In this respect, stock removal takes on an essential role: it is a manufacturing process that requires a solid Know-how for the design of hi-tech, reliable and robust machines.

Coolant supply and chip evacuation in deep hole drilling have been developed through the use of different systems and technologies. These include gun drills or the single tube system BTA (STS).

BTA deep hole drilling has more advantages compared to gun drilling, which is the most common method and is now out of date: this in fact, thanks to its drill chuck, allows more rigidity and accuracy since it does not have the traditional longitudinal slot that gun drills have.

Moreover, the continuous circulation of coolant, which enters from the outside of the tube and comes round from the inside, ensures that chips are easily ejected to the outside and that the drill is constantly lubricated and cooled.

Horizontal multi-spindle drilling machines for boring tube sheetHorizontal multi-spindle drilling machines for boring tube sheet

Galbiati built different deep hole spindle drilling machines with variable centre distance. He designed two and three spindle drilling machines with a single drilling axis Z, two and three spindle drills with independent drilling axes Z for drilling plates and diaphragms of shell and tube heat exchangers employed in the following sectors: chemical, petrochemical and nuclear industry with the use of BTA (STS) deep hole drilling or GUN DRILLING.

Some of the drills designed by Galbiati have the added advantage of having an optional milling spindle, which is very useful for the finishing of tube plates (separators, groovings, countersunk holes and holes for stay rods) without having to move the component onto other machines.

Moreover, the machines are also equipped with a digital CNC system Siemens Sinumerik 840D, which is inserted in a suitable wall unit and located inside a control cabin that moves vertically and independently together with HEIDENHAIN linear measurement systems.

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Galbiati Group - Engineering & Machining

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