1 Comparison of planer and rotary cutter
The wood planer is the main equipment for the production of veneers and meager wood. According to the direction of movement of the planing knife relative to the horizontal plane, the wood planing machine can be divided into two types: vertical and horizontal; according to the direction of the cutting direction, the machine is divided into vertical or parallel with respect to the length direction of the wood fiber, and the cutting machine can be divided into two. Horizontal planer and longitudinal planer. The modern size of the planer is only 1/3 of that of the previous planer. It is compact in structure, light in weight, easy to install and debug. It can be continuously produced, saves time for loading wood, and has high production efficiency. The work is extremely stable and almost listens. No noise. The rotary cutter is also one of the main equipment for producing veneers, and in a sense, it is used more widely than the planer. Rotary cutting machine can be divided into two types: concentric rotary cutting and eccentric rotary cutting according to whether the wood segment rotates around its own axis. The concentric rotary cutting machine is further divided into a card shaft rotary cutting machine and a non-card shaft rotary cutting machine. Eccentric rotary cutting can achieve a beautiful radial pattern, but the productivity is lower than concentric rotation. Rotary cutting machines are generally large in size and complex in structure. Before the machine is installed, the logs are centered. If the centering is not accurate, the continuous veneer strips or narrow veneers will be unscrewed when the rotary cutting starts. The more broken boards or narrow single boards, the more sapwood boards are lost, which is not conducive to continuous production. The logs are curved, the sections are irregular, and the ends of the ends (tips) are easy to cause the unscrewed veneers to be broken veneers, which wastes wood. And when the diameter of the log is reduced to a certain extent, it can no longer continue to cut (that is, the remaining wood core causes wood waste). The disadvantage of the planer is that the width of the sliced ​​veneer is narrow, generally 300 rnm has special requirements. 4 low speed, high torque. Compared with electromagnetic motors, the most notable feature of ultrasonic motors is the characteristic of large torque output at low speeds. The torque density (torque weight ratio) of the ultrasonic motor is 100 to 1000 times the torque density of the electromagnetic motor. 5 The structure is simple and flexible, and the movement forms are diverse. The ultrasonic motor generally consists of two parts: a stator and a rotor (or a moving body), and it is very convenient to integrate the stator and the rotor of the motor with the fixed part and the moving part in the motion system, respectively. Ultrasonic motors are available in a variety of flexible configurations such as rings, discs, squares, cylinders and spheres, and are very easy to implement in many forms of motion, such as rotational motion, linear motion, two-dimensional planar motion, and three-dimensional motion. 6 life, noise and reliability issues. Since most of the driving of the ultrasonic motor is contact type, this inevitably brings about frictional loss between the stator and the rotor. At present, the continuous operation of the developed low-power ultrasonic motor
Life expectancy is usually around a few thousand hours. The short life of the ultrasonic motor, poor reliability, and unstable operation are the problems that need to be solved urgently for its practical and industrialization. However, in some occasions with special work properties or special requirements for motors, ultrasonic motors can still give full play to the advantages of high torque density, flexible structure, no electromagnetic interference and large static holding torque. Ultrasonic motors are widely used in aerospace, precision machining equipment, automotive industry, scientific instruments or medical instruments, precision instruments, office automation equipment, micro-machinery, military industry and semiconductor processing industries with strong magnetic fields or magnetic fields. . Left and right or narrower, all need to be spliced, the utilization rate of wood is low, and the productivity of cutting is only about 10% of the rotary cutting; the cutting machine currently used is only sliced.
Slight wood.
2 Comparison of rotary cut veneer and sliced ​​veneer
Veneer processing is an important process for the production of artificial boards such as plywood and veneer lumber (LVL). At present, the two main methods of veneer processing at home and abroad are rotary cutting and planing, and the corresponding processing of the veneer is called rotary cutting. veneer
And sliced ​​veneers. The thickness of the rotary cut veneer and the sliced ​​veneer depends on the process specifications of the respective machine. The thickness of the rotary-cut veneer in China is about 0.25-5.5mm. The thickness of the rotary-cut veneer of foreign special-purpose rotary cutting machine can be up to 12mm; the thickness of sliced ​​veneer varies widely, which is 0. 2~lOmm. At present, the thickness of the veneers manufactured by the rotary cutting machine is mostly above lmm and below 3 mm. The thickness uniformity of the veneers in this range is good, and the process of sizing in the process of producing plywood is convenient and difficult to penetrate. The rotary cut veneer has a large format and a beautiful chord pattern. Nowadays, with the improvement of people's living standards, people's requirements for quality of life are getting higher and higher. In order to make full use of high-quality wood, the veneer (also known as thin wood) is currently used in a planing process. The sliced ​​veneer is beautiful and realistic, and is suitable for parquet patterns, plywood and veneering of furniture and construction parts.
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