Обший каталог Yamawa 2016 - 2017 - страница 848

Trouble Shooting 25.

Troubles Check point Segments

Hardness

Breakage Excessive wear Prevent excessive

Prevent clogging of chips Tap Workpiece Tap

cutting torque

●Use workpiece which has Use workpiece which has

even structure and hardness. even structure and hardness.

●Pay attention to tapping position and material thickness. ●Pay attention to tapping

position and material thick- Shape ness.

Workpiece

Provide bigger bored holes. Provide bigger bored holes.

●Provide countersinking on

●Prevent work hardening. hole entrance.

Prevent work hardening. Bored hole

Provide deeper tapping hole.

●Prevent slanting of hole.

●Avoid inconsistent feed. Machine ●Adjust feed stroke.

●Use tap holder of floating type. Jigs, Holders Use tap holder with torque limitter.

Reduce cutting speed. Reduce cutting speed.

Cutting condition

●Use the other cutting oil ●Provide proper timing for changing or filling-up of cutting oil.

which prevents cold welding. ●Prevent mixing of other oil into cutting oil. ●Use insoluble type cutting

oil. ●Use other cutting oil which prevents cold welding.

Lubricant ●Use cutting oil of insoluble type. ●Adjust flow of cutting oil and method of lubrication.

●Remove unnecessary chips during tapping. On process Provide bigger space for chips disposal.

●Use PO tap(through hole).

Selection ●Use SP tap(blind hole). ●Use Roll tap.

• Use serial set tap.

Provide bigger chiproom. Change material of taps.

• Change material of taps.

Provide proper hardness on taps. ●Provide proper hardness on taps. Tap Design ●Reconsider length of cutting chamfer. ●Reconsider length of cutting chamfer. ●Use set tap. ●Provide nitride on taps.

Provide proper land. Increase re-sharpening frequency. : Most suitable solution : Second most suitable solution