Reading volume:23 发表时间:2019/5/28 9:21:34
Because the sprocket shaft is a slender shaft, the rigidity of the parts is poor, the structure process is not good, and the following problems occur during the machining process due to factors such as cutting force, clamping force, dead weight, and cutting heat.Vibration during processing
1,The combined force of the radial cutting force and the clamping radial force will cause the workpiece to bend and vibrate when the workpiece rotates, thereby affecting the machining accuracy and surface quality.
2,When the workpiece rotates at a high speed, the bending and vibration of the workpiece are aggravated due to the centrifugal force.
3,Due to the deformation of the workpiece due to its own weight, the natural vibration of the workpiece is aggravated, and the machining accuracy and surface quality are affected.
4,The quenching and tempering treatment of steel causes bending and deformation of the blank, which seriously affects the turning processing of the subsequent process, and requires straightening treatment, which increases the processing cost.
In the trial production of the sprocket shaft, the traditional processing method is adopted, and the processing process is: 1 cutting. 45 steel, blank size φ35mm×1 180mm. 2 Heat treatment.Material handling.Restricted by the heat treatment process, complete the external treatment of quenching and tempering. 3 cars.Except for the outer diameter of φ30mm at both ends, all other models must be large and small. 4 Milling.Mill the keyway at both ends. 5 cars.Grind the core holes at both ends. 6 chamfering.The top grinding top φ30mm outer ring meets the pattern size requirement. 7 Surface treatment.Black oxidation treatment.
If the optical axis is selected, the machining process of the sprocket shaft is as follows: (1) To ensure the dimensional tolerance, polishing rods should be ordered. (2) Empty knives and chamfers are everywhere in the car.Mill the keyway at both ends. (4) Surface oxidation treatment.Because the optical axis size tolerance is less than 0.009mm, the surface hardness of the chrome-plated optical axis can reach 45HRC, and the subsequent keyway processing is difficult and unsatisfactory.