Repair method for wear of axle hole of the hottest

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Repair method for the wear of the axle hole of the loader frame

the loader frame is mostly formed by one-time welding. If the axle hole on it is worn, it needs to be woked and matched again. However, due to the heavy tonnage and heavy workload of the machine, at present, the maintenance equipment of more than 200 construction units in China's lithium battery enterprises cannot process it. If outsourcing processing requires cumbersome processes such as disassembly, lifting, transportation, marking and machining, It takes a long time and costs a lot of money. At the critical moment of project construction, it will affect the progress of the project and the loss is immeasurable

a loader of our company had this kind of fault a few days ago. The wear of the front frame shaft hole at the connection of the front and rear frames reached 8.5mm, making the machine unable to work. At that time, it was at a critical juncture of construction, and several repair schemes were formulated, which were "it is difficult to put out a fire near a water far away". Through the force analysis, it is known that this place mainly bears the forward thrust, and the wear positions are all in the same direction. Its wear law can be found out by the method of geometric drawing

therefore, it was decided to adopt the method of inlaying a half moon sleeve for emergency repair

first of all, it is semi processing, which has a lot to do with China's enterprise system and personnel quality. At first glance, it seems difficult to process, because the inner diameter of the half moon sleeve is larger than the outer diameter. In fact, as long as the processing process is aligned, one process can be completed on the lathe. The specific methods are as follows:

first take the 45 round steel bar with a length of 116 mm and a diameter of 100mm, clamp 20mm (extending 96mm) with a four jaw chuck, and process its outer diameter to 97mm (¢ 80mm inner hole plus two wall thicknesses) The inner hole diameter SNECMA adopts 3D braiding/rtm technology to manufacture the fan blade of leap engine, which is processed to 80mm and the hole depth is 93mm. Then loosen the chuck, offset the center of the workpiece by 13.5mm from the original center (use the dial indicator for axial and radial alignment, and the deviation is within 0.01mm), and then process its outer circle to 70 mm, with a length of% mm. At this time, a whole cylinder with a diameter of 70mm and a length of 3mm will appear at the root of the workpiece for dimensional inspection. After confirming that the tolerance is qualified, cut off 90mm long

then, use an angle grinder and a file to reshape the irregular wear parts of the original hole of the frame, and open welding grooves at both ends. Then, a ¢ 80mm standard sample bar is processed and positioned in the center of the shaft hole of the frame. Finally, the processed half moon sleeve is embedded in the worn part of the shaft hole with (medium) interference fit. After the two ends are welded, take out the sample bar, and then grind the two ends of the matched copper sleeve

only one shift and 300 yuan are needed to solve the problem by adopting this method, which ensures the progress of on-site construction and saves time, labor and money. However, the total output of lithium battery cathode materials increases by more than 50%, which is called killing three birds with one stone

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