The selected equipment must be reasonable. If the parts needed by some rough machinery are processed, then the high-precision equipment and selected machine tools must be used, and the accuracy requirements of the equipment can be slightly lower, while the precision parts are processed, then the precision equipment must be selected, otherwise the required parts may not be processed during processing. Once such parts cannot be processed, the enterprise will naturally lose a lot.
In production and life, electric sparks are often seen. Electric sparks generally include working sparks and accident sparks. Working spark refers to the spark generated during the normal operation or normal operation of electrical equipment. Such as the tiny spark behind the brush at the sliding contact between the DC motor brush and the commutator, the AC motor brush and the slip ring, the spark when the switch or contactor is opened and closed, the spark when the plug is pulled out or inserted, etc. Accident sparks are sparks that occur when lines or equipment fail. Such as sparks in case of short circuit or grounding, flashes in case of insulation damage, sparks in case of loose wire connection, sparks in case of fuse fusing, sparks in case of overvoltage discharge, electrostatic sparks, induced sparks and sparks caused by incorrect operation in repair work. In addition, sparks will also be generated when the rotor and stator of the motor rub (sweep the bore) or the fan collides with other components, which is a mechanical spark caused by the collision.
Milling machine processing accuracy, vertical machining center: Flatness: 0.025/300 mm; Roughness: 1.6. Gantry machining center: Flatness: 0.025/300 mm; Roughness: 2.5. The machining accuracy of a typical horizontal lathe is as follows: roundness: 0.015 mm; Cylindricity: 0.02/150 mm; Flatness 0.02/150 mm; Surface roughness: 1.6. The machining accuracy of the vertical lathe is as follows: roundness: 0.02mm; Cylindricity: 0.01 mm; Flatness 0.03 mm.
Large CNC gantry milling is a kind of processing technology that uses the milling machine with portal frame and horizontal long bed to process the plane, inclined plane, spatial surface and some special mechanical parts of large workpieces. Gantry milling is a mechanical processing technology that can process the surface of workpieces with multiple milling cutters at the same time, and the processing accuracy and efficiency are relatively high. Large scale CNC gantry milling can generally be divided into three categories: workbench mobile, gantry mobile, beam mobile (also known as bridge). Technical advantages of large CNC gantry milling? It has very good bearing capacity; The guide rail has low wear and high accuracy retention of the machine tool; The moving speed and acceleration are stable; High servo performance; High machining accuracy.
At present, machining covers a wide range, and many people begin to pay attention to machining. Machining construction pays attention to the accuracy of data cutting. Therefore, when machining errors occur, we must find out the causes of machining errors, because errors determine the construction quality and efficiency.
How much is CNC precision machining? The coating of machining is to cover the protective layer or decorative layer on the metal and non-metal surfaces of machined parts. Before painting, rust, oxide skin, grease, dust, soil, salt and dirt must be removed from the surface of machined workpieces requiring painting. Before derusting, use organic solvents, lye, emulsifier, steam, etc. to remove grease and dirt on the surface of the workpiece. The time interval between the surface to be painted after shot blasting or manual derusting and the primer shall not be more than 6h. The surface of riveted parts in contact with each other must be coated with a thickness of 30 ~ 40 before connection μ M antirust paint. Lap edges shall be closed with paint, putty or adhesive. The primer damaged due to machining or welding shall be repainted.
Safety precautions to be paid attention to in the processing of mechanical parts: the positioning should be accurate and reliable to prevent misoperation caused by vibration during operation. It is convenient to operate, avoiding the number of times to walk back, unnecessary bending, tiptoe and other actions. Prevent uncoordinated actions of operating parts and accidents caused by uncoordinated operation by multiple people. The moving direction of the operating parts of the machine tool equipment and the moving direction of the operated parts shall comply with the regulations, and shall be marked with simple symbols. The start button should be installed in the casing or installed with a guard ring to prevent accidental touch. The hand wheel and handle installed on the shaft rod will hurt people when they rotate with the shaft during automatic feeding, so an automatic release device should be installed.
