Precision machining of shaft of explosion-proof motor

High requirements for fine vehicles should be carried out by skilled workers in a more precise lathe.If the center hole of the rear axle of the rough car is worn, the center hole must be revised to obtain an accurate machining positioning reference before finishing the car.

Fine car, must pay attention to ensure the size between the two bearing gear, that is, we say the shaft shoulder, because its accuracy requirements are more stringent, and other shaft gear as a benchmark.

After the completion of shaft finishing, the bearing position, shaft extension position and other parts of the grinding processing, the same, the process of finishing also need to be in the grinding parts of the appropriate machining margin, grinding processing in order to ensure that the size of the same time, to ensure that the processing surface to achieve sufficient roughness requirements.

For the especially large explosion-proof motor shaft, limited to the size of the equipment ability control requirements, the theoretical grinding should be completed by the way of fine vehicle, but this must have high equipment precision and personnel operation skills to ensure.

Explosion - proof motor shaft of the car

High requirements for fine vehicles should be carried out by skilled workers in a more precise lathe.If the center hole of the rear axle of the rough car is worn, the center hole must be revised to obtain an accurate machining positioning reference before finishing the car.

Dead center mounting workpiece is more stable, but wear.The movable top is of poor rigidity, but it can avoid the wear between the workpiece and the top. Therefore, the movable top is widely used in cutting with high speed.

Fine car clamping method and rough car when roughly the same.When finishing, the diameter and length of all shaft gears are all turned to the size specified in the drawing, except the grinding step (0.3~ 0.5mm).The chamfering Angle of the end face and the overpass groove of the grinding wheel are also turned out at the same time.

For the small motor, in order to prevent the bending deformation of the shaft during pressing, the core is pressed after the knurling, and then the bearing position, shaft extension position and the outer circle of the core.Or the armature file, commutator file, shaft secondary file, fan file and other fine car, bearing file according to the size of the drawings to enlarge 0.3~0.5 mm, the rotor pressure, and then fine car bearing file, armature outer circle, the outer circle of the commutator, to ensure the coaxiality of all parts of the rotor.

Fine car, must pay attention to ensure the size between the two bearings, that is, we say the shaft shoulder, because its accuracy requirements are more stringent, and other shaft as a benchmark.

The direction to improve the turning productivity is to improve the manufacturing accuracy of the blank to reduce the machining allowance;Improve the turning quantity, reduce the number of cutting times, in order to shorten the cutting time and auxiliary time.The advanced technologies used are high speed cutting, strong cutting, multi - blade machining, copying turning.

To improve the machining precision of turning, it is necessary to analyze the factors affecting the machining precision and take corresponding measures according to the specific machining conditions.Workpiece and tool clamping to be accurate and reliable: process system stiffness is good;The cutting edge of the tool should be ground carefully;Cutting depth and small amount of cutting, cutting force is also small, so the process system elastic deformation is small, the quality of the processing surface can be improved.

When the shaft fine turning, often use a small cutting depth and the amount of tool, so that can get higher machining accuracy and surface roughness.

Axis of the grinding

Higher surface roughness is required for both ends of motor shaft and shaft extension.Although the use of fine car can meet the requirements, but low productivity, high cost.It is more economical to use the semi - finished car after grinding the outer circle.

During grinding, place the workpiece between two dead centers and rotate it with the core chuck and the dial.The purpose of dead center is to reduce the clearance between the center and the shaft, eliminate the vibration, so as to achieve the required machining accuracy.

When grinding the outer circle, longitudinal feeding (longitudinal grinding method) is usually adopted. The grinding wheel ACTS as the main cutting motion, and the workpiece rotates and reciprocates in a straight line with the work table (longitudinal feeding).The grinding allowance is ground under multiple longitudinal feeds.At the end of each reciprocating stroke, the grinding wheel is cut horizontally (radially).The longitudinal grinding method is characterized by high precision.For small motor shaft, because the processing part is not long, sometimes use the transverse feed (cross grinding method).The grinding wheel is only fed horizontally.The width of the grinding wheel should be slightly larger than the length of the ground (generally larger than 5~10 mm).For rough grinding, the transverse feed is 0.025~ 0.02mm/workpiece per revolution) for fine grinding, the transverse feed is 0.001~ 0.012mm/workpiece per revolution.Horizontal grinding method is characterized by high work efficiency, but the cylindrical deviation of the outer circle is large, and diamond knife must be often used to trim the appearance of the grinding wheel.