Method of preventing tooth from continuously breaking in band saw blade, saw tooth structure of band saw blade used for the method and band saw blade with tooth having the same saw tooth structure

A method of cutting a metal workpiece using a bandsaw blade (BS) having a plurality of saw teeth (TS) provided along a running direction of the bandsaw blade, wherein each of the plurality of saw teeth includes

• a tip and
• a projecting portion provided at the rear of the tip, and having a contact surface whose height is lower than the height (H) of the tip by a predetermined amount (t),
• wherein the plurality of saw teeth includes a first saw tooth and a second saw tooth following the first saw tooth in the running direction of the bandsaw blade,
• the method comprising:
• causing the bandsaw blade (BS) to cut into a workpiece made of metal while causing the bandsaw blade to run along the running direction, so that the projecting portions of the saw teeth including the first and the second saw teeth are prevented from being in contact with a bottom portion of a cutting groove formed in the workpiece during cutting;
• causing the contact surface of the projecting portion of the first tooth to be in contact with the bottom portion of a cutting groove when the tip of the first tooth is broken during cutting, so that the movement of the tip of the second tooth toward the bottom portion of a cutting groove is limited to the predetermined amount (t) between the height of the tip and the height of the contact surface.

A method of cutting a metal workpiece using a band saw blade (BS) having a plurality of saw teeth (TS), each saw tooth having a tip and a projecting portion disposed at a rear of the tip, comprising the steps of:

• moving the band saw blade (BS) to a longitudinal direction (V) thereof as well as to a cutting direction (C) perpendicular to the longitudinal direction so as to cut the metal workpiece;
• bringing, when a tip of a saw tooth is broken, a projecting portion broken into contact with a bottom portion of a cutting groove formed in the metal workpiece;
• and
• limiting a cutting amount of the following saw tooth, thereby preventing the following saw tooth from breaking.

A method of cutting a metal workpiece using a bandsaw blade (BS) having a plurality of saw teeth (TS) provided along a running direction of the bandsaw blade, wherein each of the plurality of saw teeth includes

• a tip and
• a projecting portion provided at the rear of the tip, and having a contact surface whose height is lower than the height (H) of the tip by a predetermined amount (t),
• wherein the plurality of saw teeth includes a first saw tooth and a second saw tooth following the first saw tooth in the running direction of the bandsaw blade,
• the method comprising:
• causing the bandsaw blade (BS) to cut into the metal workpiece while causing the bandsaw blade to run along the running direction, so that the metal workpiece is cut by the tips of the teeth;
• causing, when the tip of the first tooth is broken during the cutting, the contact surface of the projecting portion of the first tooth to be in contact with the bottom portion of a cutting groove formed in the metal workpiece;
• limiting the movement of the tip of the second tooth toward the bottom portion of a cutting groove to the predetermined amount (t).

A method of cutting a metal workpiece using a bandsaw blade (BS) having a plurality of saw teeth (TS) provided along a running direction of the bandsaw blade, wherein each of the plurality of saw teeth includes

• a tip and
• a projecting portion provided at the rear of the tip, and having a contact surface whose height is lower than the height (H) of the tip by a predetermined amount (t),
• wherein the plurality of saw teeth includes a first saw tooth and a second saw tooth following the first saw tooth in the running direction of the bandsaw blade,
• the method comprising:
• causing the bandsaw blade (BS) to cut into the metal workpiece while causing the bandsaw blade to run along the running direction, so that the metal workpiece is cut by the tips of the teeth;
• causing, when the tip of the first tooth is broken during the cutting, the contact surface of the projecting portion of the first tooth to be in contact with the bottom portion of a cutting groove formed in the metal workpiece, so that the movement of the tip of the second tooth toward the bottom portion of a cutting groove is limited to the predetermined amount (t).