The axis of the outer and outer circles or the inner hole is parallel to the axis of the outer circle but does not coincide (deviate from each other by a certain distance), called an eccentric workpiece. The workpiece whose outer circle and outer circle are eccentric is called the eccentric shaft. The eccentric shaft is usually machined on a lathe and adopts an appropriate installation method. When machining eccentric workpieces, pay special attention to the accuracy of the parallelism and eccentricity of the control axis.
reader:
When the CNC machine tool is added to the eccentric workpiece, the scribing method is used first. So, how to draw the scribe of the eccentric workpiece?
Xiaobian:
When installing and turning eccentric workpieces, the eccentric shaft (set) axis should be slashed first, and then mounted on two top or four-jaw single-action chucks. Now, Xiaobian uses the eccentric axis as an example to give a detailed introduction to the scribe method of eccentric workpieces.
1. First, the workpiece blank is driven into an optical axis so that the end faces are perpendicular to the axis. Care should be taken to avoid errors in production, because the error will directly affect the accuracy of the alignment, determine the surface roughness, and then apply a layer of blue display agent on both sides of the shaft and the outer circumference of the shaft. In the V-frame of the flat plate.
2. Use the vernier caliper to measure the highest point of the optical axis, and record the data. Then move the cursor of the vernier height gauge down to half of the actual measured diameter. Then draw a horizontal line on the section of the bow and arrow, then Rotate the workpiece through 180 degrees, still use the height you just adjusted, and then draw another horizontal line on this section. Check the two lines before and after the coincidence. If they coincide, it is the horizontal axis of the workpiece. If it is not coincident, adjust the height scale of the cursor. The amount of movement of the cursor is half of the distance between the two parallel lines. This is repeated until the two lines are coincident.
3. After finding the shaft of the workpiece, you can draw the circle on the section and the circumference of the workpiece. These drawn lines are the horizontal section of the axis and the intersection line of the workpiece, which plays a big role in the subsequent production. .
4. Rotate the workpiece by 90°, align the contoured end line with a 90° angle, and draw another set of horizontal lines on the end face and the outer circle. This is the easiest and most convenient way to draw the circle.
5. Move the cursor of the vernier height gauge up by an eccentricity dimension, and also draw a circle on the end face and the periphery of the shaft.
6. Use the two feet to make the eccentricity e as the radius, take the eccentricity on the end face of the workpiece, make the eccentric point, make the circle with the eccentric point as the center, and use the sample to punch the eye on the drawn line. These eye-catching eyes should be placed on the line and should not be skewed, otherwise eccentricity errors will occur.
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Label: How to scribe when machining CNC eccentric workpieces?
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