Knives Used In Metal Tube Cutting

Tube Cutting Knives

Conventional method of cutting steel tubes mill were frction saw or by COC cutters.

Since these cutting procedure were getting obselete the and industries were looking for faster method of cutting tubes on Tube Mill. The latest method of cutting mentods in tube mill are Punch type tube Cut off. This can accommodate tube speed upto 200 mts./mts. The cutting principle employed is shear force applied by a mechanical / Hydraulic/ Pneumatic device.

Other advantages of using Tube Cut-Off system are –

(a) High length accuracy ie _/1 1 mm on 3mts. Length at Mill Speed of 150 mts./min.
(b) Suitable for round and section tubes.
(c) Cutting is burr free.


Tube Cut off knife plays an important role in Punch Type Tube Cut-Off system Dee Tee Tube Cut-Off Knife is made from High Speed Steel (AISI-M2) and moves up and down at high speed. While cutting tube, it passes through a set of dies and clearance between knife and dies is very fine which asks for a closer thickness tolerance on knife. Apart from thickness, warpage should be well controlled to avoid breakage while moving through dies.


FEEDING LENGTH SIGNAL CLAMPING SCARF REMOVAL TUBE CUTTING

Punch type tube cut-off system( Burr Free, Double blade Type)

(A) Recommended Tolerance On Dee Tee Tube Cut Off Knives :

1 Hardness:-

61 HRC- base hardness, within +/-1 HRC ( if not apecified in drawing)

2 Thickness Tolerance
- 0.025/-0.00 mm length of knife 0 to 150 mm.
- 0.035/-0.00 mm, length of knife above 150 upto 300 mm.
- 0.045/-0.00 mm, length of knife above 300 mm.

3 Warpage
0.02 mm per 100 mm length.
0.015 mm within 75 mm depth from hole side

4 Perpendicular, side to bottom
within 0.025 mm per 100 mm.

5 Center distance of holes
within +/-0.25 mm.

6 Width Tolerance
within -0.05/+0.00 mm

7 Surface Finish
0.2 Ra or Better.


(B) PARAMETER OF PRIME IMPORTANCE FOR TUBE CUT-OFF KNIVES.

1. Hardness.
2. Wear Resistance
3. Toughness
4. Edge Retention
5. Impact resistance.

AISI M2 is the best raw material for tub ecut off knives considering above requirements. Knives are also available TIN COATED. These TIN COATED knives give beter life. On Bond Tin Coating, 2/3 microns give good hardness low coefficient of friction corrosion resistence which increases tool life 2 to 3 times.

(C) CHEMICAL COMPOSITION OF RAW MATERIAL

AISI-M2 : C Mn Cr MO V W
0.86/0.94 0.15/0.40 4.0/4.5 4.7/5.2 1.7/1.9 6.2/6.6

Article Provided By Deetee Industries Manufacturer and Exported of Industrial Cutting Tools, Inductrial Cutting Knives And Blades
Deetee Industries is a Manufacturere of Cutting Tools which last longer – Slitting Line Tooling, Tube Cut Off Knives, Shear Knives, Circular Saw Knives, Steel Centers, Chipper Knives, Friction Saws, Shear Blades, HSS Saw & C.T Saw Bodies.

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