If the gear is directly pressed against the faceplate, the grinding wheel can not retreat. For this reason, it is necessary to add a tire plate to the faceplate, but the diameter of the gear hole is different, and it is necessary to make a plurality of tire plates. After analysis and discussion, it was decided to make several blocks of equal height to replace the placenta plate. When pressing the workpiece, make full use of the trapezoidal groove on the disk, and determine the circumferential position of the compression bolt hole according to the gear size, and adjust it through the trapezoidal groove on the disk. Test, process and test according to the three-point positioning principle.
The process of processing the contour column is to fix the contour column to the appropriate position of the disk according to the flange size of the gear inner hole, and then the gear reference surface is directly in contact with the contour column, and the T is fixed on the disk. The compression bolts in the groove press the gears, pre-tighten them, then use the needles to fit into the slots to correct the workpiece, and adjust the external runout to meet the drawing requirements.
In the adjustment process, the gear can be easily changed and the workpiece is aligned by slightly tapping the gear in the radial direction, which is much more convenient and faster than using the three-jaw chuck.
Compared with the old and new technology, the inner hole of the gear is ground by the contour column, and the workpiece alignment time is shortened. When using the three-jaw chuck, the workpiece was taken for 30 minutes, but now using the column positioning, the workpiece is just 10 minutes in alignment, saving 20 minutes over the past.
By grinding the inner bore of the gear with a contour column, the quality of the workpiece after machining is improved. When using the three-jaw chuck, the radial runout and the end face runout are up to 0110mm. The use of the column positioning after the radial runout and end face runout can be controlled at 0103mm, fully meeting the drawing requirements.
Processing instructions and improvement suggestions, processing of contour columns: material requires high hardness and wear resistance, quenching process can be used to improve hardness; o several pieces of equal height columns need to be ground at the same time to ensure the end face runout of the gear; The positions of the bolts and the contour columns should correspond to each other as close as possible to ensure sufficient clamping torque and prevent gear deformation and internal stress.
The contour block is modified into a U-shaped pad, which is placed at the inner hole flange and the wheel gear edge to prevent the gear from being deformed during clamping. The hard-toothed gear structure is an integral forging. The spokes are thicker and have better rigidity. The contour columns can also meet the processing requirements. If the soft-toothed gears (such as cast steel wheels) are machined according to this method, U-shaped pads are recommended. If the contour block is used for machining, the force N of the column block on the gear and the pressing force F of the bolt to the gear form a pair of force couples M. Under the action of the force couple M, the gear wheel portion will not be deformed due to the absence of the support gear.
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