What is CNC plasma cutter?
CNC plasma cutting machine is a machine for processing metal materials by means of plasma cutting technology. Compared with fiber metal cutting machine, plasma cutter has the advantage of thicker metal cutting ability and economical price. With different gases, it can also cut a variety of metals which is difficult to cut by oxygen cutting , especially for non-ferrous metals like stainless steel, carbon steel, aluminum, copper, titanium, nickel.
Application of plasma cutter
CNC plasma cutter can cut stainless steel, carbon steel and other non-ferrous metals such as copper and aluminum. With the advantages of fast cutting speed, smooth cut surface, little heat distortion and almost no heat affected zone, plasma cutting machines are widely used in automobiles, locomotives, pressure vessels, chemical machinery, nuclear industry, general machinery, engineering machinery, steel structures and other industries!
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Poor manufacturing quality for low-speed heavy-duty gears such as concentrators, which have certain requirements on material handling. The tooth surface should have high resistance to wear, gluing and plastic deformation, and the roots should have higher resistance to breakage. ability. In order to meet the needs of production and operation, both large and small teeth need 45 quenched and tempered steel, the hardness is controlled at HB220250, the mechanical properties are better, the tooth blank needs better, and the tooth blank needs to be forged. According to the hardness test of the gear, the hardness of the reduction gear is low and the quality is not controlled. In particular, some gears have low machining precision, and the base deviation and tooth profile error are large, which will seriously affect the stability and contact of the gear transmission. Accuracy and service life. Therefore, defects in the manufacture of gears result in inferior product quality, which is the most basic cause of the rapid wear of the tooth surface.
Improper installation and maintenance (1) In order to ensure the normal operation of the gear, there are high requirements for its motion accuracy, work stability, contact accuracy, and flank clearance, all of which are not only related to the quality of the original, but also to the assembly process and assembly. Precision also has a close relationship. The theoretical contact point of the gear under normal conditions should be as shown in 2(a), but the common contact points in the field are usually indicated as shown in (b) and 2(c): the cause is in addition to the machining accuracy, mainly with gears and The installation of the transmission mechanism has a great relationship. The transmission mechanism is assembled on site, and it is difficult to ensure that the rolling direction of the roller coincides with the tangent of the track circumference.
There is an off angle A between the moving direction of the roller and the circumferential tangent, and the driving force F and the frictional force Fc received by the roller both generate a radial component force T and Tc, and Tc=T=FsinA, the radial direction Force is harmful to the roller track and gears and racks. Under the action of the radial force Tc, each time the roller moves a distance, the track (rack) will vibrate, the sound of frequent/disintegration 0, plus the track wear, the roller/sink 0, and the roller The reduction gear and the transmission gear mounted on the same travel shaft follow/sink 0, thus forming a vicious circle, affecting the normal meshing of the gears and shortening the service life of the gears; further, the large and small reduction gears are respectively mounted on the travel shaft and Over the axle, as shown: if the two shafts are not parallel or skewed, it will affect the tooth tip clearance and the flank clearance between the large and small reduction gears, causing the two gears to mesh abnormally, affecting the smoothness of their work and making the gear wear. Accelerate; at the same time, improper installation of other parts and parts of the truss will also affect the mutual position of the gears and reduce the service life.
(2) After the initial operation of replacing the new gear, usually only pay attention to understand whether the operation and sound of each part are normal. If it is basically normal, it will be put into use, and the running and empty test will not be sufficient, and the purpose of gear running will not be achieved. (3) The operator did not lubricate according to the lubrication instructions. According to the specification, the oil roller of the transmission mechanism and the oil cup of the bearing should be tightened once for 8 hours. The grease of the gear should be replaced regularly. In fact, the lubrication period mentioned above is very long, and even some of them are only refueled at the initial installation. It has not been added or changed. In addition, some operators will leave small wood, mud and other media between the gear teeth after adding the lubricating oil, which will deteriorate the lubrication environment and aggravate the gear wear.
Measures to reduce gear wear and improve gear life The reasons for gear wear are analyzed above. To reduce wear and increase gear life, the following measures can be taken. Material selection must be reasonable, first of all must be passed on the quenching and tempering process. According to the variation law of the two-wheel sliding coefficient during gear transmission, the sliding coefficient of the tooth root is larger than the sliding coefficient of the tooth top, and the sliding coefficient of the tooth root of the small gear is larger than the sliding coefficient of the tooth root of the large gear. The tooth root wear of the small reduction gear is nearly equal. The pinion should be made of harder material and its hardness is higher than the hardness of the large gear by several tens of HB. The pinion can also be used with high frequency induction along the groove. Heating and surface hardening increase its wear resistance.
On the other hand, the displacement coefficient is reasonably selected. The number of teeth of the original reduction pinion used is 16, and the modulus is 12. The displacement coefficient is 0.42 to avoid the undercut phenomenon, and the large gear displacement coefficient is 0. The large gear displacement coefficient is -0.42, which reduces the tooth top of the large gear, and the tooth top of the small gear increases, so that the maximum sliding coefficients of the large and small gears are nearly equal, thus improving the wear of the large and small gears. , and relatively increased the carrying capacity of the two rounds.
After the roller structure is modified and the roller/sinking phenomenon occurs, the outer diameter of the roller can be increased to ensure the tooth tip clearance between the large and small reduction gears. Since the roller and the reduction gear (transmission gear) are mounted on the same traveling shaft, and the shaft is connected by a key, when the axis is on a line, a phenomenon of waiting for a total of 0 will occur, in order to avoid this phenomenon, The connection between the roller and the traveling shaft is changed to the bearing connection, so that the movement of the roller and the reduction large gear are both in the same direction and do not interfere with each other. After the transformation, the field effect is very good, which not only ensures the tooth tip clearance between the gears, but also avoids the / creeping 0 phenomenon, greatly reduces the vibration of the roller table and the foundation, makes the whole transmission mechanism run smoothly, and improves the use of the gears. life.