3.2 card axis
3.2.1 The diameter of the card shaft reduces the diameter of the wood core, which can increase the plate rate. The most straightforward and most intuitive way to reduce the diameter of the core is to reduce the diameter of the shaft. However, the diameter of the shaft must ensure that there is sufficient torque when the wood is cut and does not cause damage to the ends of the wood. The smaller the log diameter, the larger the proportion of the wood core in the volume, so the diameter of the small-diameter wood core is much more important than the diameter of the large-diameter wood core. At present, the diameter of the small-diameter material can be as small as 5 to 6 mm.
3.2.2 Number of card sleeves
Single, dual, and non-cardless rotary cutters are well known to the plywood industry. The birth of the cardless shaft rotary cutting machine mainly solves the reduction of the diameter of the wooden core of the double-clamp rotary cutter and improves the yield. However, the non-card shaft rotary cutting machine needs to perform two-time rotary cutting, the shear loss of the single-plate is increased, the thickness precision of the spiral-cut single-board is not high enough, the rotation-cutting speed is not enough, and so on. In order to overcome the shortcomings in the production of single-clamp, double-clamp and non-clamp rotary cutters, the 3-card rotary cutter was successfully developed in Finland in 1996 by Lauter. 3 card shaft rotary cutting machine not only improves the yield rate, but also improves the rotary cutting efficiency and the quality of the veneer. The machine is equipped with a driving press roller to increase the driving force and reduce the torsion of the wood core when the small diameter wood is turned.
3.2.3 card shaft speed
Rotary cut softwood and hardwood, the speed of the card shaft and the speed of the cutting are very different. The speed of the conical rotary cutting shaft is 600r/min, and the speed of the hardwood cutting shaft is about 400r/min. The rotary cutter has two gearboxes to meet the needs of different diameter grade wood cutting. Two different speeds can be selected by the operator at the console via the control keys. Because the speed of the new rotary cutter is stepless, the speed of the card can be automatically selected from zero to its maximum speed. In this way, the producer can select any rotary cutting speed required for the production conditions.
Stepless adjustment of the shaft speed. The rotation speed is from 0 to 400r/min or 180r/min. As the diameter of the wooden section is gradually reduced, the speed of the card shaft is automatically increased to maintain a constant line speed to ensure the quality of the board. The old rotary cutter speed is manually shifted by changing the gearbox and the number of teeth. The speed cannot be kept stable and the constant line speed rotation cannot be achieved. For example, the maximum speed of the conventional card shaft is 200r/min and the maximum cutting speed is 180m/min. The theoretical minimum core diameter should be 287mm. That is, the maximum speed of the card shaft is 200r/min, and the constant line speed rotation can not be performed when the diameter of the wood segment is rotated to 287mm. When the diameter of the core is 110mm, the theoretical maximum cutting speed is 69m/min. The low-speed turning causes the back surface of the veneer to have large cracks and the quality of the veneer is poor.
3.2.4 card axis expansion asynchronous
3 The card shaft rotary cutting machine card shaft retracting steps and methods have also undergone a fundamental change; that is, the left and right card shafts are respectively retracted in 5 steps, which avoids the sudden withdrawal of the outer card shaft of the double card shaft rotary cutting machine, and instantly increases the torque to the small card shaft. As a result, the core of the wood core is screwed at the medium-diameter level, especially the wood with a large diameter and a low bulk density, the wood core is soft and the probability of the core being twisted is high. 3 The left and right diameters of the outer chuck and the middle chuck of the card shaft rotary cutter are different. Each time the card shaft is withdrawn, the rotary cutting process is very stable.
3.2.5 card shaft retraction speed card shaft quick retracting device; the contemporary new rotary cutting machine has a very fast retracting speed of the card shaft, usually 600mm/s, which means that the diameter of the wood segment can be rotated closer to the outside when the rotary cutting is performed. When the diameter of the middle shaft is reduced, the card shaft is withdrawn. Thus, the biggest advantage is that the quality of the veneer of the medium and small diameter core material is increased, the diameter of the wood core is reduced, and the screwing of the wood core is greatly reduced. Increased yields.
3.2.1 The diameter of the card shaft reduces the diameter of the wood core, which can increase the plate rate. The most straightforward and most intuitive way to reduce the diameter of the core is to reduce the diameter of the shaft. However, the diameter of the shaft must ensure that there is sufficient torque when the wood is cut and does not cause damage to the ends of the wood. The smaller the log diameter, the larger the proportion of the wood core in the volume, so the diameter of the small-diameter wood core is much more important than the diameter of the large-diameter wood core. At present, the diameter of the small-diameter material can be as small as 5 to 6 mm.
3.2.2 Number of card sleeves
Single, dual, and non-cardless rotary cutters are well known to the plywood industry. The birth of the cardless shaft rotary cutting machine mainly solves the reduction of the diameter of the wooden core of the double-clamp rotary cutter and improves the yield. However, the non-card shaft rotary cutting machine needs to perform two-time rotary cutting, the shear loss of the single-plate is increased, the thickness precision of the spiral-cut single-board is not high enough, the rotation-cutting speed is not enough, and so on. In order to overcome the shortcomings in the production of single-clamp, double-clamp and non-clamp rotary cutters, the 3-card rotary cutter was successfully developed in Finland in 1996 by Lauter. 3 card shaft rotary cutting machine not only improves the yield rate, but also improves the rotary cutting efficiency and the quality of the veneer. The machine is equipped with a driving press roller to increase the driving force and reduce the torsion of the wood core when the small diameter wood is turned.
3.2.3 card shaft speed
Rotary cut softwood and hardwood, the speed of the card shaft and the speed of the cutting are very different. The speed of the conical rotary cutting shaft is 600r/min, and the speed of the hardwood cutting shaft is about 400r/min. The rotary cutter has two gearboxes to meet the needs of different diameter grade wood cutting. Two different speeds can be selected by the operator at the console via the control keys. Because the speed of the new rotary cutter is stepless, the speed of the card can be automatically selected from zero to its maximum speed. In this way, the producer can select any rotary cutting speed required for the production conditions.
Stepless adjustment of the shaft speed. The rotation speed is from 0 to 400r/min or 180r/min. As the diameter of the wooden section is gradually reduced, the speed of the card shaft is automatically increased to maintain a constant line speed to ensure the quality of the board. The old rotary cutter speed is manually shifted by changing the gearbox and the number of teeth. The speed cannot be kept stable and the constant line speed rotation cannot be achieved. For example, the maximum speed of the conventional card shaft is 200r/min and the maximum cutting speed is 180m/min. The theoretical minimum core diameter should be 287mm. That is, the maximum speed of the card shaft is 200r/min, and the constant line speed rotation can not be performed when the diameter of the wood segment is rotated to 287mm. When the diameter of the core is 110mm, the theoretical maximum cutting speed is 69m/min. The low-speed turning causes the back surface of the veneer to have large cracks and the quality of the veneer is poor.
3.2.4 card axis expansion asynchronous
3 The card shaft rotary cutting machine card shaft retracting steps and methods have also undergone a fundamental change; that is, the left and right card shafts are respectively retracted in 5 steps, which avoids the sudden withdrawal of the outer card shaft of the double card shaft rotary cutting machine, and instantly increases the torque to the small card shaft. As a result, the core of the wood core is screwed at the medium-diameter level, especially the wood with a large diameter and a low bulk density, the wood core is soft and the probability of the core being twisted is high. 3 The left and right diameters of the outer chuck and the middle chuck of the card shaft rotary cutter are different. Each time the card shaft is withdrawn, the rotary cutting process is very stable.
3.2.5 card shaft retraction speed card shaft quick retracting device; the contemporary new rotary cutting machine has a very fast retracting speed of the card shaft, usually 600mm/s, which means that the diameter of the wood segment can be rotated closer to the outside when the rotary cutting is performed. When the diameter of the middle shaft is reduced, the card shaft is withdrawn. Thus, the biggest advantage is that the quality of the veneer of the medium and small diameter core material is increased, the diameter of the wood core is reduced, and the screwing of the wood core is greatly reduced. Increased yields.
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