Aluminum profile cutting machine

01

Choose single-head or double-head, and the blade size

DEMAC's aluminium cutting range describes double-head machines with 450–600 mm blades in what DEMAC calls CNC, precision and “Common” types, cutting at 45° and 90° or by up-cutting, and single-head saws with 420–600 mm blades that can cut any angle, 90° or 45°/90°, which can be combined with automatic or CNC stoppers for feeding and positioning. Blades are special carbide-tipped (TCT) or diamond blades for aluminium profiles. [2]

Single-head saws can be combined with automatic or CNC stoppers for feeding and positioning, and corner-connector saws are a separate type. [2] For a double-head saw, ask how the second head is positioned for each length and angle, and choose by your profile cross-sections, length range, angles and batch sizes.

One maker's data for a CNC double-head mitre saw (Jinan JMD, LJJ2DS-500×4200) give an example of the published figures: 500 mm blades (500 × 4.4 × 3.6 × 30 mm, 120 teeth) at 3,000 rpm, 9.5 kW input power on 380 V three-phase 50 Hz, 0.5–0.8 MPa air, cutting length 320–4,200 mm at 90° and 45°, maximum cut 138 mm wide by 290 mm high, rack-driven moving head with 0.02 mm stated repeat positioning accuracy, blade feed by hydraulic damping cylinder on linear guides, 5,950 × 1,750 × 1,500 mm overall and 1,900 kg. [3]

Give the supplier the profile drawings and alloys, maximum width and height, length range, cut angles, batch sizes, accuracy needed, blade diameter, feeding and length measurement, dust and chip extraction, noise limits and power supply.

02

Set the blade: tooth pitch, rake and cutting speed

Hoffmann's carbide-tipped TextFlow 12 aluminium saw blade data sheet recommends fine tooth pitch for thin-walled profiles or plates up to 5 mm, medium pitch for profiles and tubes over 5 mm, and coarse pitch for solid bars; a 6° negative rake for machines with oscillating blade infeed from above; trapezoidal teeth for hard-anodised profiles; and an even feed rate to prevent damage. A 300 mm blade has 96 teeth at 9.8 mm pitch. [1]

The same sheet gives two cutting speeds that do not agree: a note recommends 40–80 m/s, while its user-data table lists 850 m/min (about 14 m/s) for short-chipping aluminium and 650 m/min for alloys with over 10% Si. [1]

Editorial calculation: spindle speed n = cutting speed ÷ (π × diameter). For the 300 mm blade, 850 m/min gives about 900 rpm, while 40–80 m/s gives about 2,550–5,090 rpm. [1] Because the figures differ by a factor of about 3 to 6, confirm the blade's speed rating and the saw's spindle speed with both makers before ordering.

Editorial calculation: the JMD saw's 500 mm blade at 3,000 rpm runs at π × 0.5 m × 3,000 ÷ 60 ≈ 79 m/s, inside the 40–80 m/s note on the Hoffmann sheet and far above its 850 m/min table value. [3] [1]

03

Check an automatic-feed saw for short parts

For batches of short parts cut from bar, a third design replaces the operator's push-and-stop with a servo feed. Samdy's CNC-405 specification lists a 405 mm (16-inch) carbide blade of 25.4 mm bore, 3.2 mm kerf and 80 teeth, a 4 kW saw motor and 4 kW hydraulic unit on 380 V, 0.6–0.8 MPa air, a maximum cut of 280 × 120 mm and an 800 mm table. Feed is by servo motor, ball screw and 25 × 25 mm linear guide over a 300–850 mm feeding stroke. [4]

Samdy states cutting accuracy of 0.1 mm, position-rule accuracy of ±0.1 mm, cut perpendicularity of ≤0.1 mm and a minimum last piece of 30–40 mm, which sets the offcut left from each bar. The table gives pneumatic clamping with adjustable pressure, while one paragraph on the same page describes hydraulic clamping, so confirm which is fitted. The machine measures 2,550 × 1,200 × 1,400 mm and weighs 300 kg. [4]

Editorial calculation: tooth pitch = π × 405 mm ÷ 80 teeth ≈ 15.9 mm, against 9.8 mm for the 300 mm, 96-tooth Hoffmann blade; ask which pitch the saw maker fits for your wall thickness. [4] [1]

04

Double-head window saws and servo-feed automatic cutters among the listed makers

DEMAC, Bluetek, Haikai, JMD and Yidao list single- and double-head aluminium cutting saws with other window and door machines; Samdy and Ruiguang list automatic aluminium cutting machines with CNC servo feeding; North Jinfeng lists a CNC aluminium cutting machine alongside its band saws.

05

Saw head, blade infeed, clamps, length stop and chip extraction

The infeed direction ties the machine to the blade: Hoffmann specifies its 6° negative rake for machines whose blade comes down into the profile from above, so state the infeed before ordering blades. [1]

06

Cutting length, capacity at each angle, blade diameter and spindle speed for a saw quotation

The spindle-speed row is where published figures disagree: the JMD saw's 500 mm blade at 3,000 rpm runs about 79 m/s, inside the 40–80 m/s note on Hoffmann's sheet but far above its 850 m/min table value, so ask which speed the fitted blade is rated for. [3] [1]

07

Send the profile, cut and blade data together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Profiles: [drawings; alloys; wall thickness; anodised]
Cuts: [lengths; angles; batch sizes; accuracy]
Machine: [single or double head; up-cut; CNC feed]
Blade: [diameter; teeth; pitch; rake; speed rating]
Clamping: [positions; pneumatic]
Site: [power; air; extraction; noise]

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