What should be prepared before mechanical cutting?

Release time: 2017-06-12 10:40:14

First, the mechanical cutting steel plate surface pretreatment
       Steel from the steel plant through a series of intermediate links to the cutting workshop, during this time, the steel surface will inevitably produce a layer of oxide. In addition, the steel plate in the rolling process also produced a layer of oxide attached to the steel plate surface. The melting point of these oxide is not easy to burn and melt, increasing the warm-up time, reducing the cutting speed; at the same time after heating, the skin around the splash, easy to cause clogging the cutting mouth, reducing the life of the cut mouth. Therefore, before the mechanical cutting, it is necessary for the steel surface of the rust pretreatment.
Commonly used method is shot blasting rust, after painting rust. That is a small iron sand shot peening machine to the surface of the steel plate, by the impact of iron on the steel plate to remove the scale, and then sprayed with flame retardant, good conductivity of the anti-rust paint.
The pre-treatment of the derusting paint before the steel plate cutting has become an indispensable link in the production of metal structures.
        First, the mechanical cutting before the preparation of gas cutting
       The surface of the cut metal should be carefully removed from rust, dirt or oil. The cut pieces should be padded so as to dissipate heat and remove slag. Must not be placed on the concrete floor cutting, because the concrete surface after the high temperature will crack. The specific requirements before cutting are as follows.
       1. Check whether the workplace meets the safety requirements, torch, oxygen cylinder, acetylene bottle (or acetylene generator and tempering preventer), rubber tube, pressure gauge, etc. are normal, the gas cutting equipment according to the operating procedures connected.
       2. Mechanical cutting, the first piece of the workpiece pad, leaving a certain gap below the workpiece, in order to facilitate the iron oxide slag blowing. When cutting, in order to prevent the operator from splashing iron oxide slag burns, if necessary, can be added baffle block.
       3. Check the wind wire by igniting the flame and adjusting the preheat flame. Then open the cut oxygen valve to observe the shape of the cut oxygen flow (ie wind line), the wind line should be straight, clear cylinder and have the appropriate length. This can make the workpiece incision surface smooth and clean, wide and narrow. If the wind line is irregular, should close all the valves, with a needle or other tools to trim the inner surface of the mouth, so smooth. The power of the preheating flame should be adjusted according to the thickness of the plate. The flame nature should be neutral flame.
       4. Adjust the oxygen to the desired pressure. For the suction torch, check whether the torch has a suction capability.
Mechanical cutting inspection method is: first unplugged acetylene inlet hose and bent up, and then open the acetylene valve and preheat oxygen valve. At this time, the finger on the torch of acetylene over the air pipe joints, if the fingers feel pumping force and can be adsorbed on the acetylene inlet pipe joints, indicating that the torch has the ability to smoke, you can use; otherwise, that torch is not normal , Can not be used, should check the repair.