Общий каталог Widia 2017 - страница 595

Technical Recommendations Separator Cut-Off System

Improve chip control: Figure A

• Adjust feed rate up or down to accommodate chip formation.
• Use a 0° or smallest lead available.
• Use ample amounts of well-directed coolant (see Figure A).
• Maintain sharp cutting edge and corners.

Improve fl atness of cut-off surfaces:

• Maintain 90° position (perpendicular alignment) between cut-off tool and workpiece.
• For low to moderate speed (sfpm), use Separator F2.
• For moderate to high speed (sfpm), use Separator S2 or X2.
• Use strongest toolholder system possible.
• Use 0° lead angle inserts when possible. If lead angle inserts are needed, reduce the feed rate.
• Check for minimum overhang of holder and blade.
• Set up for minimum workpiece overhang (distance out of chuck).
• Reduce feed rate.
• Maintain sharp edge and corners on cut-off insert.
• Increase speed (RPM).
• Use ample amounts of well-directed coolant (see Figure A).
• Maintain proper tool centre height 0–0,1mm above centre (see Figure B).

Improve surface fi nish:

• For low to moderate speed (sfpm), use Separator F2.
• For moderate to high speed (sfpm), use Separator S2 or X 2.
• Avoid overly aggressive chip control.
• Increase speed.
• Reduce lead angle and feed rate.
• Determine if corner radius is too large or small.
• Use a coated grade.
• Use coolant (see Figure A).

Coolant on cut-off tool Preferred method of applying coolant

Figure B

Minimise edge chipping:

• Check to see if tool is signifi cantly above or below centre.
• Reduce feed prior to part drop-off.
• Use Separator S2 or X2.
• Choose the proper speed associated with the insert grade used.
• Call Technical Support to see if a larger hone size is needed.
• Eliminate chatter.
• Avoid chip re-cutting.
• Check for these part and machine problems:
• Slide is loose.
• Slide travel is irregular.
• Bar/tube I.D. and/or O.D. is out of round.
• Bar/tube is bent.
• Thin wall collapses (deforms) in the cut.
• Part is unstable.
• Cut-off through unturned stock.
• Excessive tool overhang.
• Bent or partly attached fl ash ring.

(continued)