Was established in 1998, is a collection of r & dproduction, trade as one of the high-tech company, the company specializes in manufacturing various micro-motor shaft...
Was established in 1998, is a collection of r &d production, trade as one of the high-tech company, the company specializes in manufacturing various micro-motor shaft...
Our machine including large CNC lathe, CNC machining center, CNC centerless grinding machine, CNC Incisive grinding machine, CNC cylindrical grinding machine, heat treatment machine.
Pump shaft bending measurement
Pump shaft overhaul
The high-pressure water pump has a precise structure, a small gap between the moving and static parts, a high rotational speed of the rotor, and a heavy load on the shaft, so the requirements on the shaft are strict. The bending of the shaft is generally not allowed to exceed 0.05 mm, pump shaft otherwise straight shaft operation should be performed. If the pump shaft is found to have one of the following conditions after disassembly, the new shaft should be replaced. The surface of the shaft has cracks; the surface of the shaft is washed by a high-speed water flow to produce deep groove marks, especially at the keyway, the shaft is greatly curved, and is bent by multiple straight axes. For individual parts of the pump shaft, there are bristles or elbows that can be repaired by thermal spraying or plating.
Axis bending measurement
When measuring the bending of the shaft, it should be carried out at room temperature. Most of the shafts can be measured on a flat or flat concrete floor, supporting both ends of the journal on a ball cage or V-shaped iron, while heavy-duty shafts such as turbine rotor shafts are typically carried out on the bearings of the body. The axial yaw should be limited to 0.1mm before measurement.
The steps to measure the bending of the shaft are as follows:
(1) The shaft is equally divided into several measuring sections along the axial direction, and the measuring surface should be selected as far as possible in a smooth circular section with no wear and burrs in the perfect circle.
(2) Divide the end face of the shaft into several equal parts (generally eight equal parts). The shaft with the coupling can be divided into the bolt holes of the coupling, as shown in the following figure (a); the shaft without the coupling is divided equally by the keyway, as shown in the following figure (b); and the permanent mark is made. . The aliquot is used as the measuring point, and all subsequent measurement records should be consistent with these marks.
Pump shaft alignment method
This method can be used when the shaft diameter is small and the bending is large. First place the shaft in the triangular notch block, or place it on the machine with the ejector pin against the ends of the shaft, and then bend the convex apex of the shaft upward. Use a screw press to hold the apex of the projection and press down until the shaft is straightened.
This method can be used when the shaft diameter is large and the bending is small. pump shaft This method uses a tamper to cool the curved concave surface of the shaft so that the shaft extends straighter here. The rod should be made of a material with a hardness lower than the hardness of the pump shaft, or a copper sleeve on a material with a high hardness. The edge of the rod must have a rounded corner.
On a straight axis, the concave side of the shaft faces up and supports the convex apex of the largest bend. Press down on both ends with a tensioning device, then tap the bar with a 1-2 kg hammer to extend the concave material of the shaft by tapping.
When striking, first tapping from the center of the lowest concave surface, gradually moving to the sides, and proceeding along one third of the circumference of the arc, but the density toward the center should be greater.
The amount of alignment of the shaft is usually proportional to the number of strokes. Note that when the initial tapping, the axis is straightened faster and later. When you strike, you should pay attention to the crowbar and do not damage the surface of the shaft.
When the amount of bending of the shaft is not large (less than 1% of the shaft length), the screw jack can be straight in the cold state. In the straightening, taking into account the rebound of the shaft, it is necessary to overcorrect the shaft to ensure that the corrected axis is more straight. The accuracy of this method can reach 0.05-0.15 mm per meter.
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