Reasons for tooth chipping of second-hand metal band sawing machine

　　Band sawing machine is a machine tool used for sawing various metal materials. According to the structure, it is divided into horizontal and vertical; according to the function, it is divided into semi-automatic, fully automatic, and numerical control. Horizontal type can be divided into double column and scissor type. So when we use metal band saws, we sometimes have tooth chipping. So what is the reason for the tooth chipping? How can we avoid it? The editor summed up some of the reasons, let's take a look.

　　1. Reasons caused by the problem of second-hand metal band sawing machine:

　　1. The metal band saw machine is affected by the vibration of the surrounding punching equipment, and the fixing bolts of the band saw machine are loosened, which affects the jitter of the saw frame, and the band saw blade is affected by the vibration force during the cutting process, resulting in tooth chipping.

　　2. Air entering the lifting cylinder, or due to poor oil quality, cylinder wear, control valve out of control, etc., all cause the saw frame to fail to drop at a constant speed, and the teeth may be broken.

　　3. The three-point linearity of the driving wheel, the driven wheel and the guide escapement can not reach the accuracy, the saw band cannot run in a straight line, and there may be unstable cutting left or right and up and down.

　　4. The motor belt is damaged for a long time and appears aging and slack. It may lose rotation intermittently during operation, causing the saw band to experience intermittent and weak sudden stop during cutting, resulting in tooth chipping.

　　5. The guide block of the sawing machine wears out after a long time use, which may cause the saw band to not be able to cut normally during the cutting process, causing unexpected bad factors to cause the saw band to be damaged and scrapped.

　　2. Reasons caused by improper selection of teeth:

　　1. Regardless of whether the sawed workpiece is solid or pipe, whether the saw tooth is suitable or not, cut at will, which will inevitably cause the phenomenon of tooth chipping.

　　2. The tooth pitch is selected incorrectly. If the material with a small cross-section is cut by a large saw tooth, there will be a tooth pull.

　　3. When sawing channel steel, round pipes, square pipes and other special-shaped materials, if the feed rate is not controlled properly, it is most prone to tooth chipping, so special attention should be paid to it.

　　3. Reasons caused by improper operation:

　　1. The initial feed control is out of control, the saw band does not touch the workpiece slowly and smoothly, and the saw band drops quickly to impact cutting, causing the tooth tip to be overloaded and chipped in an instant.

　　2. Due to sloppy behavior during operation, the workpiece is not clamped or the clamped workpiece is not reliable. The workpiece becomes loose or vibrating during sawing, and the saw tooth is passively driven under the uncertain external force.

　　3. The saw band is not installed properly, and the back of the saw band grinds the edge of the saw wheel to make the saw band work abnormally.

　　4. The new saw band cuts at high speed without normal running-in, and the feed rate is too large, causing tooth chipping. This phenomenon is a relatively common problem in operation and should be paid attention to.

　　5. When the saw frame is lifted up after the sawing, the cut workpieces will squeeze each other, and they will squeeze the rising saw band to cause toothing.

　　6. The clamping method of the workpiece is not correct, the workpiece is easy to move, resulting in tooth chipping.

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