The shape of the nozzle defect after the saw is cut off and the measures to improve it

Types of nozzle defects: Nozzle defects mainly include deflection heads, beveled heads, rubbing heads, nozzle blockages, etc.

Head defects

The head is mostly on thin-walled tubes, and the root cause is that the pipe walls are thin and the ability to resist the impact of the saw blade is weak. The specific reasons are as follows:

(1) The saw blade is used for too long, and the sawtooth wear is serious;

(2) The thickness of the saw blade is improperly selected and too thick;

(3) The pressure of the sawing cylinder is too large

Bevel defects

The main reasons for the beveled head are:

(1) The flying saw is not synchronized with the welded pipe;

(2) There is axial channeling of the sawing spindle

(3) The blade swing amplitude is large

(4) The sawing trolley is running unsteadily

Head wiping defects

Reasons for wiping the head:

(1) Improper design of lifting saw parameters;

(2) The design of loose clamp parameters is premature

(3) There is axial channeling of the sawing spindle

Nozzle clogging defects

Causes of nozzle blockage:

(1) out of sync;

(2) The blade swings greatly;

(3) There is axial channeling on the back of the saw;

Measures to eliminate nozzle defects:

(1) Measures for the deflection head: (1) select a thinner saw blade to reduce the sawing resistance; (2) change the saw blade frequently; (3) appropriately reduce the sawing cylinder pressure to reduce the sawing speed; (4) switch to a saw blade with a larger number of teeth.

(2) Measures for wiping the head: (1) adjust the accuracy of the saw; (2) adjust the lifting time, loosening time and cutting time

(3) Measures for the beveled head: (1) adjust the operating parameters of the saw machine, such as the first acceleration, the first deceleration and the synchronous adjustment time; (2) check the accuracy of the spindle of the saw machine and the accuracy of the drive mechanical fit; (3) check the flatness of the saw blade

(4) Measures to solve the blockage of the nozzle: change the saw blade frequently on the measures for handling the beveled head.

The improvement of the sawing quality of the welded pipe end face will create favorable conditions for the subsequent offline finishing of the welded pipe such as flat head, chamfer, etc.

——The above information and data come from the Internet