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Title:
METHOD OF CONTROLLING CUTTING OF STEEL PIPE
Document Type and Number:
Japanese Patent JP2002113651
Kind Code:
A
Abstract:

To obtain a steel pipe product having an excellent cut end surface without deficiencies such as generation of a burr or seizure by controlling the feed speed of a rotary grinding wheel 10 based on the length of contact which is changeable according to the relative position of the steel pipe P and the rotary grinding wheel 10.

The feed speed of the rotary grinding wheel 10 is increased during the period (P0-P1) from when the lowest point (b) of the rotary grinding wheel 10 is at the initial position till when the lowest point touches the steel pipe P, and the rotary grinding wheel 10 is fed at the constant speed of a first set value F1 when the upper pipe wall of the steel pipe P is cut (P1-P2). When the lowest point (b) is located between P2 and P3, the feed speed of the rotary grinding wheel 10 is increased, and when the lowest point is between P3 and P4, the rotary grinding wheel is fed at the constant speed of a second set value F2. When the lowest point (b) reaches the position P4 where the length of contact begins to increase, the feed speed of the rotary grinding wheel 10 is decreased, and the rotary grinding wheel is fed at the constant speed of a third set value F3 to the lowest position P6 on the outer periphery of the steel pipe P. Next, the feed speed of the rotary grinding wheel 10 is decreased till the lowest point (b) reaches the lowest position P7 including a projecting margin α, and then, when the lowest point reaches the lowest position P7, the rotary grindstone 10 is inverted to be raised to the position P0.


Inventors:
KITAOKA TAKEO
Application Number:
JP2000000309121
Publication Date:
April 16, 2002
Filing Date:
October 10, 2000
Export Citation:
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Assignee:
NISSHIN STEEL CO LTD
International Classes:
B24B27/06; (IPC1-7): B24B27/06
Domestic Patent References:
JPH04289071A1992-10-14
Attorney, Agent or Firm:
小倉 亘