This problem has been a very headache for our industry for a long time. Many factories suffer losses
because of wear and tear, which leads to the increase of old capital and no profit to speak of. Even if they win, they have to close down. I will tell my friends what I have learned over the years, I hope it will be of benefit to my friends.
First we need to understand how wear and tear is caused. Wear is caused by the grinding between the screw, barrel and the material. The mutual use of the three means that all three are related. First of all, the material, the material is wood chips. The type of sawdust matters a lot. Pine sawdust wear very little, because it contains rich fat, fat at high temperature can form a thin film of oil wear, followed by hard miscellaneous wood, very poor is Chinese fir sawdust. Then there's the screw; The forward elevation Angle of screw is directly related to the size of thrust, the greater the Angle, the greater the thrust, the greater the wear, the better the rod, and vice versa. The compression Angle of the gun barrel is also very important. The bigger the Angle is, the greater the resistance is and the greater the wear is. The typical examples are the honan muzzle gun barrel in the past and the straight muzzle gun barrel in the northeast.
Now that we know what the problem of wear and tear is, we can take care of it. Method 1: adjust the Angle of the screw properly, 2: adjust the Angle of the barrel properly. Also according to their own premises, appropriate to increase their wear resistance, such as the use of spray welding and surfacing welding method. In short, it would not be difficult to deal with the problem if the cause of it had to be known.
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