When installing and turning eccentric workpieces, the axis of the eccentric shaft (sleeve) should be crossed first, and then installed on the two center or four jaw single acting chuck. Now take the eccentric shaft as an example to introduce the machining and marking method of eccentric workpiece.
1. First turn the workpiece blank into an optical axis, so that the two end faces are perpendicular to the axis. Attention should be paid to avoid errors in production, because their errors will directly affect the alignment accuracy, determine the surface roughness, and then paint a layer of blue display agent on the two end faces and the surrounding outer circle of the shaft, and put it in the V-shaped frame of the flat plate after it is dry.
2. Use the vernier caliper to draw the tip of the needle to measure the highest point of the optical axis, and record the data, then move the vernier of the vernier height gauge down to half of the actual measured diameter of the workpiece, and gently draw a horizontal line on one section of the bow and arrow, then turn the workpiece 180 degrees, still use the height just adjusted, and then draw another horizontal line on this section. Check that the front and rear lines coincide. If they coincide, it is the horizontal axis of the workpiece; If it does not coincide, the vernier height gauge needs to be adjusted, and the vernier moves down by half of the distance between the two parallel lines. Repeat until the two lines coincide.
3. After finding out the axis of the workpiece, you can draw a circle line on the section and around the workpiece. These lines are the horizontal section of the axis and the intersection line of the workpiece, which plays a great role in later production.
4. Turn the workpiece 90 degrees, use a flat teaching ruler to draw the end line, and then use the vernier height ruler just adjusted to draw a circle line on the shaft section and around, so as to get two mutually perpendicular circle lines on the workpiece, which is the simplest and convenient way to draw a circle line.
5. Move the vernier of the vernier height gauge up by an eccentric dimension, and also draw a circle line on the end face and around the shaft.
6. After the center line of the eccentricity is drawn, the two ends of the eccentricity center are respectively punched. The center position of the punching hole is required to be accurate, and the hole pit should be shallow, small and round.
If two centers are used to turn the eccentric shaft, the central hole shall be drilled first according to the same punching; If four jaw single action chuck is used for clamping and turning, an eccentric circle should be drawn first according to the same punching. Colleagues must also punch several sample punching holes evenly and accurately on the eccentric circle for alignment.