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24 October 2022

Low-E Coating Glass KC83,JINQIU

Main configuration: Insulating Low-E coating Glass
Quantity / sqm: 9000m2
Construction Glass: Low-E Coating Insulating Glass and Insulating GlassMain configuration: Insulating Low-E coating Glass
Quantity / sqm: 9000m2
Construction Glass: Low-E Coating Insulating Glass and Insulating Glass
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03 November 2022

What is the main fault of the flywheel and how to repair it?

The main faults of the flywheel after use are: wear of the working surface, wear or breakage of the gear ring.
If the flywheel working surface is severely ablated, uneven, or swayed, it can be checked with a dial indicator on the cylinder block. For the non-perpendicularity of the connecting end of the crankshaft and the flywheel facing the axis of the crankshaft, the runout value displayed by the dial indicator 34mm from the axis of the crankshaft should not be greater than 0.025mm. The bounce of the contact surface between the flywheel and the clutch friction plate should be no more than 0.1mm.If it exceeds the regulations, it should be repaired Repairing the flywheel working surface can be carried out on a lathe or a surface grinder. After grinding, it should meet the technical requirements, otherwise it should be scrapped.
If the flywheel teeth are worn or broken, they can be surfacing welded with low-carbon steel electrodes, and then restored to their original shape by fitter processing, without heat treatment
If one or part of the flywheel teeth is broken, the ring gear can be removed and repaired by turning over and shifting it. Because the ring gear and the flywheel are in an interference fit, the ring gear must be heated (can be heated by a blowtorch), generally at about 300°C, and then punched down with copper milling. For the overturned ring gear, it is best to use a file to chamfer the end face to mesh with the starter gear.
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03 November 2022

Current status of domestic crankshaft processing

The crankshaft is one of the key parts of the engine, its structure is complex, the production batch is large, the variety is changed frequently, and the precision is high. The dimensional accuracy of the spindle connecting rod neck is IT6~IT7, the roundness is less than or equal to 0.005mm, and the surface roughness is Ra0.2~0.4. Therefore, an advanced crankshaft production line must not only achieve flexible conversion to meet market demand, but also meet process requirements, ensure processing accuracy, and finally produce qualified products. The forged steel crankshaft production line has the world's top numerical control machine tools, advanced processing technology and increasingly perfect management system, which not only greatly improves the crankshaft processing efficiency, realizes the flexible and rapid production change ability, but also better guarantees the crankshaft processing quality. At present, the quality of crankshafts is mainly ensured by the process control of machining and heat treatment, and there are roughly three ways:
1. Human testing: refers to the online measurement of each process by professional quality inspection personnel (or self-inspection and mutual inspection by operators) in accordance with process requirements, and timely adjustment of process parameters to prevent unqualified products from being transferred to the next process or batch rejects .
2. Equipment control: Relying on higher equipment accuracy to ensure the processing accuracy of the current process is an effective way to ensure dimensional accuracy, shape accuracy and position accuracy, and it is also one of the signs of advanced crankshaft processing production lines.
3. Process guarantee: Process is the "law of converting the crankshaft blank into finished product during machining; the criterion is the fundamental guarantee of product quality, and it is also the prerequisite for improving processing efficiency.
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