Summary of Common Problems and Replies of High Quality Rail Cutting Machine
Sep 23, 2021| Summary of Common Problems and Replies of High Quality Rail Cutting Machine
1. How to choose grinding wheel for purchasing portable rail cutting machine? What is the basis for selecting grinding wheel when purchasing portable rail cutting machine?
Answer: Although the grinding wheel of the rail cutting machine is a consumable and does not belong to the fixed component of the rail cutting machine itself, its performance has a great impact on the effect of rail cutting. The closing process of rail cutting is a grinding method without cooling and lubrication, and the cutting section must be smooth, not burned, high geometric accuracy and short cutting time. Therefore, higher requirements are put forward for the grinding wheel as the "cutting tool" of rail cutting machine. The safe linear speed, abrasive and particle size and hardness of grinding wheel are the main basis for selecting appropriate grinding wheel.
Safe Linear Speed:
On the premise of ensuring the safety of use, the use of high-speed grinding wheel and maintaining high output speed of gasoline engine is conducive to give full play to the power of engine and improve cutting efficiency.
Abrasive and Particle Size:
Select abrasive with high hardness and toughness and small particle size to ensure high cutting efficiency and avoid excessive friction heating and burn of cutting section in the cutting process.
Hardness:
The hardness of the grinding wheel refers to the firmness of the binding agent to the abrasive particles, that is, the difficulty of the abrasive particles falling off the grinding wheel under the action of grinding force. The hardness of grinding wheel is the main factor affecting cutting accuracy and cutting efficiency. If the grinding wheel is too hard, the abrasive particles can’t fall off after being blunt, and the cutting efficiency is very low. At this time, the grinding wheel is easy to deform under the action of radial force, which can’t ensure the plane accuracy of rail cutting section. The grinding wheel cannot be too soft. The abrasive grains fall off from the grinding wheel when they are not blunt. The grinding wheel wears itself too fast and the cutting efficiency is very low.
2. What are the main factors affecting the geometric accuracy of the rail cutting machine?
Answer: Rail clamping support and dynamic support are the main links to determine the geometric accuracy of rail section. Through analysis, it can be determined that the main factors affecting the geometric accuracy of rail cutting section are:
Inclination of grinding wheel shaft caused by parallelism machining error of shaft holes of power support and upper and lower swing arm support. During rail cutting, during the swing of the grinding wheel around the rail, the power support connecting the upper and lower swing arms and the four parallelism deviations affect and overlap each other, resulting in the inclination of the grinding wheel plane.
The operating force applied during cutting and the torsional deformation of the power support and swing arm support caused by the gravity of the main engine lead to the deflection of the grinding wheel when cutting the rail. During the rail cutting operation, the gravity of the main machine and the applied operating force will cause the torsional deformation of the upper and lower swing arms and the power support, resulting in the increase of the parallelism deviation of each parallel pin shaft.
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