Tube sheet drilling

Tube sheets are widely used in shell-and-tube heat exchangers, boilers, pressure vessels, steam turbines, large central air-conditioning systems, and other industries.

Category:

CNC Deep Hole Drilling Machine Series

Phone:

+8613853419218

Email:

dzjichuang@163.com

Request for Quotation

Keywords:

CNC Deep Hole Drilling Machine Series

Product Information

Tube sheets are extensively used in shell-and-tube heat exchangers, boilers, pressure vessels, steam turbines, and large central air-conditioning systems.
It is primarily used in chemical process equipment, such as shell-and-tube heat exchangers, pressure vessels, boilers, condensers, central air-conditioning systems, evaporators, and seawater desalination units, where it serves to support and secure the tube bundle. The metallic material not only imparts exceptional structural rigidity but also exhibits excellent thermal conductivity.
Tube sheets used in Class III and Class IV pressure vessels demand relatively high machining accuracy. Traditionally, hole-making was performed by scribing with a try square and then drilling with a radial arm drill. In recent years, as chemical-process vessels have grown in size, tube-sheet diameters have steadily increased while wall thicknesses have also thickened, prompting the adoption of CNC technology in tube-sheet fabrication. Today, it is common practice to use CNC drilling machines for initial hole-locating followed by radial-arm-drill operations to complete the hole-machining process. Moreover, the use of machining centers for high-efficiency, high-precision hole-making is gradually gaining acceptance among large-scale enterprises. Currently, there is a growing demand for large, heavy-duty tube sheets in the nuclear-power, seawater-desalination, and central-air-conditioning heat-exchanger sectors.
During the inspection of tube sheets, the primary inspection parameters include hole position, hole diameter tolerance, internal surface finish, presence of burrs, and groove location, among others. For double tube sheets, particular attention is paid to hole positioning, as the alignment and fit between the holes on the two tube sheets are critical. Our company’s independently developed and designed large-scale CNC three-axis deep-hole drilling machine can reliably ensure these requirements. The tube sheet workpiece is shown in the figure.

Technical Specifications	Parameters
Maximum workpiece diameter	Φ1000mm/ Φ2000mm/ Φ3000mm/ Φ4000mm/
Maximum workpiece thickness	100mm—1000mm
Bore diameter range (gun drilling)	Φ7mm-Φ24mm
Bore diameter range (BTA drilling)	Φ16mm–Φ40mm
Maximum drilling depth	1000mm
Workpiece T-slot worktable dimensions (width × height)	4200mm × 3000mm
Number of spindle(s) in the drill pipe box	1/2
Spindle center distance of the drill pipe box	170mm–250mm (adjustable)
Drill pipe box spindle speed	100–3000 r/min (stepless)
Drill pipe box spindle motor power	2 × 11 kW (servo motor, DELTA)
Maximum horizontal travel of the X-axis	4000mm
Maximum X-axis travel speed	4000mm/min
X-axis positioning accuracy	Overall length: 0.05 mm
X-axis motor power	4.87 kW, 27 N·m (AC servo motor, Siemens)
Maximum Y-axis travel	2000mm
Maximum Y-axis travel speed	4000mm/min
Y-axis positioning accuracy	Overall length: 0.05 mm
Y-axis motor power	4.87 kW (AC servo motor, Siemens)
Maximum Z-axis travel	1000mm
Z-axis feed rate	0–4000 mm/min (stepless)
Maximum Z-axis feed force	37KN
Chip conveyor type	Automatic chip conveyor
Chip evacuation speed	2000mm/min
CNC system	Siemens