Multi-blade circular saws, known as “multi-rip saws” or simply “multi-saws,” are fundamental woodworking machines designed for high-efficiency lumber processing. Unlike single-blade circular saws, they integrate multiple circular saw blades (typically 2–6 blades) on a shared spindle, enabling simultaneous parallel cuts in a single pass. This technology revolutionizes tasks like ripping logs into boards or slicing timber into dimensional lumber, offering precision and speed unattainable with traditional band saws or single-blade systems.
Core Structure and Operation
A multi-blade circular saw comprises:
– Power and drive units: Electric motors (N.k., 11 kW–22 kW) coupled with speed regulators.
– Cutting assembly: Spindles mounting ultra-thin (1.5 mm–3.0 mm) Blade za mviringo zilizotengwa na collars kufafanua unene wa bodi.
– Mifumo ya kulisha: Mifumo ya mnyororo au roller inayoendeleza kuni kwa kasi inayoweza kubadilishwa (0-8 m/me).
– Mifumo ya Msaada: Jets ya maji baridi, Vumbi Extractors, na pampu za lubrication.
Wakati wa operesheni, Magogo au mbao ingiza kupitia infeed, hupigwa na mifumo ya kulisha kiotomatiki, na kupitisha blade zinazozunguka. Blade huzunguka saa 2,800-4,300 rpm, kutengeneza laini, Bodi za sare zilizo na upotezaji mdogo wa kerf (Sawdust).
Manufaa juu ya saw za jadi
Multi-rip mviringo saw blade hubadilisha usindikaji wa mbao na:
1. Mavuno yaliyoimarishwa: Blade nyembamba (≤3 mm) Inapunguza inaongeza taka 46%, Kuongeza ahueni ya mbao hadi 76-80%.
2. Kasi & Akiba ya Kazi: Pass moja hutoa bodi nyingi - e.g., Logi ya 2M hugawanyika katika bodi 8-9 kwa sekunde. Pato la kila siku hufikia 20-30 m³, outperforming band saws by 4–7×.
3. Precision and Finish: Cuts achieve near-planed surface quality, eliminating secondary planing for applications like furniture or flooring.
4. Usalama: Enclosed blades and automated feeds minimize operator contact with circular saw blades.
Table: Performance Comparison: Traditional vs. Multi-Blade Saws
| Metric | Band/Rip Saws | Multi-Blade Saws|
|—————–|——–|————–|
| Daily Output | ~5 m³ | 20–30 m³ |
| Lumber Recovery Rate | 50–60% | 76–80% |
| Power Consumption | High | 25–40% Lower |
| Labor Cost/m³ | ~$60 | ~$15 |
Common Types and Applications
– Log/Block Saws: Process small-diameter logs (5–20 cm) into boards for pallets, flooring, or joineries.
– Square-Timber Circular Saw Blades: Cut pre-squared lumber (N.k., 4×4 to 10×10 cm) into thinner slabs for furniture frames or moldings.
– Panel Circular Saw Blades: Trim engineered wood (plywood, Bodi ya chembe) to precise dimensions.
Circular saw blades vary by tooth geometry:
– Left-Right Teeth: General-purpose cutting; ideal for hard/softwoods and sheet goods.
– Trapezoidal (TCG) Meno: Minimize veneer chipping in laminates or melamine boards.
– Flat Teeth: Economical option for rough cuts in non-decorative timber.
Critical Safety & Maintenance Practices
Operational Safety:
1. Pre-Cut Checks: Verify blade sharpness, integrity, and alignment. Dull or damaged circular saw blades increase friction and fracture risk.
2. Machine Setup: Ensure blades rotate with spindle direction and are securely clamped. Flanges should cover ≥⅓ of blade diameter.
3. Personal Protection: Operators must wear fitted clothing, safety glasses, and ear protection. Gloves and loose items are prohibited.
4. Feed Control: Advance material steadily without forcing. Jagged knots or embedded metal can jam blades, causing kickback or burnout.
Maintenance Protocols:
– Cooling & Dust Control: Use water jets (0.3–0.6 MPa pressure) to prevent overheating and clear chips. Blocked vents cause resin buildup on blades, accelerating wear.
– Blade Storage: Hang blades vertically or lay flat (unstacked) to avoid warping or corrosion.
– Kunoa & Balancing: Resharpen when cuts roughen. Never alter tooth angles or drill mounting holes—this distorts blade dynamics.
Troubleshooting Common Issues:
– Blade Burning: Caused by excessive feed speed, resinous wood, or insufficient cooling. Reduce feed rate or increase coolant flow.
– Vibration/Noise: Implies loose blades, worn bearings, or unbalanced cuts. Power off immediately for inspection.
– Stalling: Clear jams only after full machine stop. Use “reverse jog” to retract trapped lumber.
Hitimisho
