7 clamping methods to help you solve turning eccentric parts!
Do you know what an turning eccentric part is?
Eccentric parts generally named eccentric axis,eccentric sleeve shafts,eccentric sleeves,eccentric screws, eccentric studs.
Here we are talking about CNC turning eccentric parts.
In mechanical transmission, rotary motion becomes reciprocating linear motion or linear motion becomes rotary motion, which is generally accomplished by eccentric shaft or crankshaft. The eccentric shaft is that the axis between the outer circle and the outer circle of the workpiece is parallel and does not overlap. The eccentric sleeve is that the axes of the outer circle and inner }L of the workpiece are parallel but not coincident, and the distance between these two axes is called “eccentricity”.
For the method of turning eccentric workpieces, different clamping methods should be adopted according to the different quantities, shapes and precision requirements of the workpieces, but it should be ensured that the axis of the eccentric part to be processed coincides with the axis of rotation of the lathe spindle. The common clamping methods for turning eccentric parts are as follows.
(1) Turning an eccentric workpiece with a four-jaw single-action chuck
This method is suitable for eccentric workpieces with small T eccentricity, low precision requirements, short length and small number.
(2) Turning an eccentric workpiece with a three-jaw self-centering chuck
This method is suitable for eccentric workpieces with large quantities, short lengths, small eccentric distances and low precision requirements. When clamping the workpiece, a shim should be added to one of the three-jaw self-centering chucks.
(3) Turning eccentric workpieces with double chucks
This method is suitable for machining eccentric workpieces with short length, small eccentric distance and large quantity. Before processing, the eccentricity should be adjusted first. The pipe thread lathe is firstly clamped on the three-jaw self-centering chuck with a processed mandrel, and then corrected; the pipe thread lathe then adjusts the four-jaw single-action chuck to offset the center of the mandrel by the eccentricity of the workpiece. ; Pipe thread lathe can clamp the workpiece for processing after removing the mandrel.
The advantage of this method of pipe thread lathe is that it only needs to correct the eccentricity once in a batch of workpieces, but the disadvantage is that the two chucks overlap and the rigidity is poor.
(4) Turning an eccentric workpiece with a faceplate
This method is suitable for machining eccentric hole workpieces with short workpiece length, large eccentric distance and low precision requirements.
Before machining the eccentric hole, first process the outer circle and both ends of the workpiece to the requirements, draw the position of the eccentric hole on the end surface, and then clamp the workpiece on the faceplate evenly with the pressure plate. Tight and ready for turning.
(5) Turning an eccentric workpiece with an eccentric chuck
This method is suitable for processing more precise partial L-I parts such as short shafts, discs and sleeves. The advantage of the pipe thread lathe is that it is convenient for clamping, can ensure the processing quality, and can obtain high precision and strong versatility.
(6) Turning eccentric workpieces with two centers
This method is suitable for machining long eccentric workpieces. Before processing, the main center hole of the center point and the center hole of the eccentric point should be drawn at both ends of the workpiece, and the center hole should be machined on the pipe thread lathe, and then the front and rear centers can be used for turning.
If the eccentric distance of the eccentric shaft is small, it may interfere with the main center when drilling the eccentric center hole. When processing pipe thread lathes, the blank can be turned into a smooth shaft first, then the center holes at both ends are turned to the length of the workpiece, and then the eccentric center hole line is drawn, the eccentric center hole is drilled, and the eccentric shaft is turned.
(7) Turning eccentric workpieces with special fixtures
This method is suitable for eccentric workpieces with high machining accuracy requirements and large batches.
Before machining, the corresponding eccentric shaft or eccentric sleeve should be processed according to the eccentric distance on the workpiece, and then the workpiece should be placed on the eccentric sleeve or eccentric shaft for turning.
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Keyword: China CNC turning Factory