7.2. Inspections
7.2.1. General recommendations
• Clean carefully machine after each work-shift /paper dust.
• Pay attention to cleanness of the control element contacts /contractors,
switches.
• Check correctness of the cutter screw connections, and tighten them, if
necessary.
7.3. Regeneration of knife
Quality and accuracy of the cutting depends on the knife sharpness and the
correct choice of the cutting edge angle.
7.3.1 The features of blunt knife:
- rough and uneven plane of stack to be cut;
- edges seizing of material to be cut;
- inaccurate cutting;
− increased accumulation of the paper dust;
7.3.2. Grinding conditions of the cutter knife:
- grinding machine of correct operation;
- appropriate chosen grinding whe
el
- clean and sharp grinding wheel /”sparked out”/
- appropriate coolant
- correct chosen grinding parameters
- even fixing of the knife
The manufacturer of knives used in the cutter recommend the cup-type grinding wheel
or grinding segments, “J” hardness, 60-80 grain size, with keeping:
- 500 m/min grinding peripheral speed;
- 8-10 m/min traveling speed;
- max. Grinding Wheel stroke per 1 feed: 0,005 mm;
- cooling with water-oil emulsion, 60 l/min., at least;
The correct sharpen knife is shown on drawing 40
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