Detailed introduction

09

2020

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10

Causes of wear of cone twin-barrel screw and evaluation of methods to reduce wear


cone double barrel screwMost of the wear occurs in the high pressure area, especially in the transition section and the latter turns of the metering section. These areas are prone to wear because high pressure can causecone double barrel screwBending, which in turn causes contact between the outer diameter of the screw and the metal on the inner wall of the barrel, thereby causing wear. leadcone double barrel screwThe bending force is generated by the pressure difference, not the usual high pressure. However, contact between the outer diameter of the screw and the inner wall of the barrel does occur, but this is caused by mechanical conditions and indicates potentially more serious problems: such as misalignment problems, gearbox damage, screw bending, barrel bending, and insufficient foundation. According to the wear test of many industries, the increase of pressure and temperature will causecone double barrel screwIncreased friction.

 

cone double barrel screwWear is usually a slow process and is not easy to detect before the performance is significantly reduced. Slight wear has little effect on overall performance, because productivity can be maintained by adjusting machine parameters. Whencone double barrel screwWhen the radial gap between the screw edge and the barrel wall increases, leakage flow is inevitable. Operators usually observe a decrease in the discharge volume and an increase in the melt temperature, but also have to increasecone double barrel screwSpeed to maintain the required amount of material, this process is often accompanied by more energy consumption. As the radial clearance increases,cone double barrel screwThe necessary pumping pressure cannot be generated to maintain the desired discharge volume.

 

In the repair process, firstcone double barrel screwGrind to a uniform inverted diameter, and then re-weld the screw to apply a higher hardness of the wear-resistant surfacing alloy on its surface, these alloys can provide better wear resistance. After surface surfacing, you must alsocone double barrel screwThe outer diameter is ground to the original tolerance. The remaining overhang welds must be profile ground to ensure as little loss of thread width as possible. In this process, some bad operations will reduce the effective thread width, which may have a significant impact oncone double barrel screwperformance has a potential impact and makescone double barrel screwFuture repair possibilities are complicated. To help alleviate these complications, some screw manufacturers choose to reduce the width of the weld. However, if this approach is adopted, when thesecone double barrel screwWhen ground to the original tolerance, the hardfacing material will not cover the entire thread width, which will affectcone double barrel screwThe anti-wear performance has a negative impact, because there will be a softer substrate exposed to the outside.