BENOY knowledge class 丨 Take you to understand three bearing hole types repair processing methods

The so-called bearing hole refers to the inner hole of the bearing. In our daily life, the common main shaft bearing holes of the body are mainly three types: reference main bearing hole, non-reference main bearing hole, and the entire row of bearing holes. Repair processing, BENOY share information about bearing hole type repair processing method based on understanding.

1.Repair processing method with reference main bearing hole

The repair process with a reference spindle hole refers to bearing cap damage processing, bearing cap replacement processing, and bearing seat damage surfacing processing. In such cases, it is usually necessary to take half a hole to ensure the size and shape tolerance of one hole. Take 4400-horsepower body replacement for example. After the workpiece is loaded, correct and clamp the workpiece. Firstly, use the 2 # attachment head of the machining spindle hole to mount the mandrel to correct the seventh gear spindle hole (the calibration position should be on the inner hole not required for the spindle hole). First determine the workpiece Y Zero of each axis of Z, Z, W, and then the Z axis is raised (note that the attachment cannot be rotated through 180 ° to align the center of the first gear spindle hole) to the first and second gears. Correct to within the range of 0.02mm that coincides with the center of the seventh spindle hole, so that the workpiece axis basically coincides with the x-axis of the machine tool, and then determine the zero point of the workpiece X-axis to start rough boring the hole that needs repair. After rough boring to 262mm rough boring, change the fine boring tool. The diameter of the tool is reduced by 1mm to 264mm for fine boring, exit, and measure (take three points at the vertical position of the entrance of the hole and the left and right horizontal position, and the two measurement points in the horizontal direction should be symmetrical to the left and right, as close to the bearing cover seat as possible.) Three-point size, the difference between the zero point of the workpiece and the hole center during the actual machining is obtained to improve the zero point of the workpiece. Adjust the diameter of the tool to 264.5mm, and then boring the hole. After the measurement, the inlet and outlet dimensions of the hole are measured. If the six-point size is not the same, it means that the center of the spindle hole and the center of rotation of the tool do not coincide. You need to modify the workpiece zero or After adjusting the clamping position of the workpiece, boring the hole, adjust the tool diameter to 264.6mm, and then boring the hole. If the six-point size is the same value, it indicates that the center of the spindle hole and the center of rotation of the tool are coincident, and fine boring can be started. , Adjust the tool to 265.00mm, boring into the hole 3mm ~ 5mm, withdraw, measure, here should pay attention to: if the tool tip does not touch at this time or just hit the bearing seat, and the hole diameter has not reached the predetermined value, should Raise the Z axis (assuming that the hole diameter is 265.00mm and it needs to be machined to 265.03mm, then the Z axis is raised by 0.015mm, the tool diameter is adjusted to 265.03mm, and the hole is machined, so that the spindle hole can be replaced with a cap. Process requirements) Similarly, it can be used to process the bearing cover and repair the main shaft hole of the bearing seat. If there is more than one such spindle hole in a body, you can process one by one according to this operation method.


2. Repair method of main bearing hole without reference

When there is one or more holes in the body that need to process the entire spindle hole, but the coaxiality between the processed spindle hole and the spindle hole that does not need to be processed must be guaranteed, the two gears with the longest distance should be processed first. The main spindle hole is corrected to the same axis, and then the hole to be processed is rough boring with a hole diameter of 264mm. After boring, the diameter of the tool is adjusted to 264.8mm, and it is moved to the main spindle hole adjacent to the hole that does not need to be processed. Check the gap between the feeler gauge and the hole wall with a 0.1mm feeler at the mouth 1mm ~ 2mm. Exit when the gaps in the four directions are the same, adjust the tool to the same diameter as the hole, and paint chalk on the inner wall of the hole. Try boring the hole (the trial cutting distance is in the range of 1mm ~ 2mm, so as not to damage the hole size). The tool exits and observes the cut marks on the chalk print. There may also be cut marks on the inner wall of the workpiece. If the cut marks are uneven, fine adjustment After the zero point of the workpiece is uniform to the cut mark, the zero point of the workpiece is determined, and the hole to be processed can be processed, and the position accuracy of the hole is guaranteed. This operation method requires that the repeated positioning accuracy of the machine tool is within the allowable accuracy range of the workpiece.

3. Repair processing method of the entire row of bearing holes

Take 16V280 body spindle hole repair as an example. Generally, the entire body of a row of holes to be machined will have a machining allowance for the boring hole by grinding the bearing cover hafur surface to reduce the diameter of the spindle hole in the vertical direction. The key problem is to find the coaxiality of the two half-holes of the first and ninth gear bearing blocks. Specific operation: After the workpiece is loaded, use the 2 # attachment milling head to align the straight line of the first and ninth gear bearing seats, determine the zero point of the workpiece, then reduce the diameter of the tool to 244mm, fine boring the ninth gear, and jump directly to the first gear after boring. Spindle hole fine boring. After the first gear is finished, use the inner diameter micrometer to measure the vertical and horizontal dimensions of the spindle hole in the first and second gears. The error between the main axis of the machine body and the axis of the machine tool X direction is obtained. By adjusting the clamping position of the machine body, Make the two axes parallel, try cutting again, and repeat several times until the actual machining of the workpiece axis is parallel to the X-axis axis of the machine tool, and then the fine boring of the spindle hole can be started.
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