precision turned automobile parts

- Nov 30, 2018 -

The main cause of error in precision turned automobile parts

Machining accuracy refers to the degree to which the actual geometric parameters (size, shape, and position) of the part after machining are in accordance with the ideal geometric parameters. In machining, errors are unavoidable, but the error must be within the allowable range. Through error analysis, grasp the basic laws of its changes, and take corresponding measures to reduce machining errors and improve machining accuracy. 

precision turned automobile parts.jpgprecision turned automobile parts


precision turned automobile parts.jpg

precision turned automobile parts

Then there will be a reason for the error. The reason for this is that we have summarized it. There are roughly the following points:

      1. Spindle rotation error. The spindle rotation error refers to the amount of variation of the actual rotation axis of the spindle at each instant relative to its average rotation axis. The main reasons for the spindle radial rotation error are: the coaxiality error of several sections of the spindle, the various errors of the bearing itself, the coaxiality error between the bearings, and the deflection of the main shaft.

      2. Track error. The guide rail is the reference on the machine tool to determine the relative positional relationship of each machine tool component, and is also the benchmark for machine tool motion. Uneven wear and installation quality of the guide rails are also important factors in the guide rail error.

      3. Transmission chain error. The transmission error of the transmission chain refers to the error of the relative motion between the first and last transmission elements in the internal linkage. Transmission errors are caused by manufacturing and assembly errors in the various components of the drive train and wear during use.

      4. Geometric error of the tool. Any tool in the cutting process will inevitably wear and cause changes in the size and shape of the workpiece.

      5. Positioning error. First, the benchmark does not coincide with the error. The basis on which the surface dimensions and locations are used to determine a surface is called the design basis. The reference on which the size and position after processing the surface to be machined in this process are determined on the process drawing is called the process reference. When machining a workpiece on a machine tool, it is necessary to select several geometric elements on the workpiece as the positioning reference during machining. If the selected positioning reference does not coincide with the design basis, a reference misalignment error will occur. Second, the positioning sub-manufacturing inaccuracy error.

      6. The error caused by the deformation of the process system. One is the rigidity of the workpiece. In the process system, if the workpiece stiffness is relatively low relative to the machine tool, tool, and fixture, the deformation caused by the insufficient rigidity of the workpiece under the action of the cutting force has a greater influence on the machining accuracy. The second is the rigidity of the tool. The external turning tool has a large rigidity in the normal direction of the machined surface, and its deformation is negligible.内The inner diameter of the smaller diameter, the rigidity of the arbor is very poor, and the deformation of the arbor has a great influence on the machining accuracy of the hole. The third is the rigidity of the machine components. The machine tool components are composed of many parts. There is no suitable simple calculation method for the machine component stiffness. At present, the experimental method is mainly used to determine the machine component stiffness.

precision turned automobile parts.jpgprecision turned automobile parts


precision turned automobile parts.jpg

precision turned automobile parts

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