Low-intensity mechanical vibrations are unavoidable in rotating equipment and flow media. Therefore, during the manufacture and installation of the unit, the interference caused by vibration should be avoided as far as possible in the design, operation and management of the unit so as to minimize the vibration hazard. When the pump room or unit vibration occurs, should be based on the specific circumstances, one by one to analyze the possible causes of vibration, identify the crux of the problem, to take effective technical measures to eliminate. Some measures are relatively simple, some measures are quite complicated. If you need a lot of money to deal with several programs that can be used for technical and economic comparison, combined with technological transformation unit. The following gives the motor, pump and pump room vibration common causes and elimination measures. 1, common causes of motor vibration and elimination 1) Bearing eccentric wear: the unit is not the heart or bearing wear. Elimination measures: re-school crew concentricity, adjust or replace the bearings. 2) stator friction: uneven air gap or bearing wear. Elimination measures: readjust the air gap, adjust or replace the bearing. 3) The rotor can not stop at any position or power imbalance. Elimination measures: re-school rotor static balance and dynamic balance. 4) Loosening the shaft: The screw is loose or badly installed. Remedy: Tighten the screws and check the mounting quality. 5) based on the vibration: the basis of poor stiffness or bottom corner screw loose. Remedy: Reinforce the foundation or tighten the bottom corner screw. 6) Three-phase current instability: Torque decreases, rotor cage or end ring fails. Remedy: Check and repair rotor cages or end rings. 2, common causes and elimination of pump vibration 1) manual crank difficult: shaft bending, bearing wear, the unit is not the heart, the impeller touch the pump shell. Elimination measures: straightening pump shaft, adjust or replace the bearings, re-unit concentricity, re-adjust the gap. 2) Pump shaft oversteer: bearing and journal wear or excessive clearance. Elimination measures: Repair journal, adjust or replace bearing. 3) hydraulic imbalance: impeller imbalance, centrifugal block individual leaf blockage or damage. Elimination measures: re-school impeller static balance and dynamic balance, eliminate clogging, repair or replacement of the impeller. 4) axial pump shaft power is too large: the water level is too low into the water tank, impeller inundation depth is not enough debris around the impeller, pump cavitation damage to varying degrees, the impeller defect. Elimination measures: Raise the water level into the pool, reduce the elevation of the pump to remove debris, and set the fence eaves, repair or replacement of the impeller. 5) based on the vibration: the basis of stiffness difference or bottom screw loose or resonance. Elimination measures: Reinforcing the foundation, tighten the ground screw. 6) Centrifugal pump unit efficiency dropped sharply or axial pump unit efficiency decreased slightly, accompanied by cavitation noise. Elimination measures: Change the pump speed, avoid the resonance area, identify the cause of cavitation occurs, take measures to eliminate cavitation. 3, other causes of the unit vibration and elimination measures 1) trash rack blocked, into the pool water level lower. Elimination measures: fence decontamination, add column fence decontamination device. 2) The front pool and into the pool design is not reasonable, the inlet channel and the pump does not complete so that the water conditions worsened. Elimination measures: bar decontamination clean, add a bar ram decontamination device design and reasonable into the former pool, into the pool and inflow channel design. 3) Siphon formation time is too long, so that the unit for a long time in non-design conditions. Elimination measures: Add vacuum device, reasonable design and improvement of siphon water outlet. 4) influent pipe fixed or cause resonance. Elimination measures: Add pipe piers and piers, pipe reinforcement support, change operating parameters, change operating parameters to avoid the resonance zone. 5) beat the door repeatedly hit the door or close the impact force is too large. Elimination measures: Flow channel (or pipe) outlet before the vent, a reasonable design of the door to take control measures to reduce the impact when the shutter door closed. 6) sudden changes in the pressure inside the water pipe and water hammer effect. Elimination measures: Slow closing valve and surge tank and other anti-water hammer measures. 7) Unit start and stop the order is not reasonable, resulting in deteriorating water pump conditions. Elimination measures: optimize the boot and shutdown sequence.
Investment Casting can make use of most metals, most commonly using steel alloys, carbon steel,stainless steel, and tool steel. This process is beneficial for casting metals with high melting temperatures that can not be molded in plaster or metal. Parts that are typically made by investment casting include those with complex geometry such as turbine blades or firearm components. High temperature applications are also common, which includes parts for the automotive, aircraft, and military industries.
Our products cover a wide range of industries including train & Railway, automobile & Truck, construction machinery, mining machinery, forklift, agricultural machinery, shipbuilding, petroleum machinery, construction, valve and pumps, electric machine, hardware, power equipment and so on. We are capable to produce products according to customers' drawings or samples, we focus on both carbon steel and alloy steel. Up to today, more than 100 raw materials and 5, 000 kinds of different products have been developed and produced by us. We are familiar with the material standards of many countries, such as Chinese GB, American ASTM, AISI, German DIN, French NF, Japanese JIS, British BS, Australian AS and Association of American Railroads (AAR ) and other industrial standards.
The process is generally used for small castings, but has produced complete aircraft door frames, steel castings of up to 3 tons and aluminium castings of up to 100 kg. It is generally more expensive per unit than Die Casting or Sand Casting but with lower equipment cost. It can produce complicated shapes that would be difficult or impossible with die casting, yet like that process, it requires little surface finishing and only minor machining.
Investment casting is used in the aerospace and power generation industries to produce turbine blades with complex shapes or cooling systems. Blades produced by investment casting can include single-crystal (SX), directionally solidified (DS), or conventional equiaxed blades. It is also widely used by firearms manufacturers to fabricate firearm receivers, triggers, hammers, and other precision parts at low cost. Other industries that use standard investment-cast parts include military, medical, commercial and automotive.
Investment casting offers high production rates, particularly for small or highly complex components, and extremely good surface finish (CT4-CT6 class accuracy and Ra1.6-6.3 surface roughness) with very little machining. The drawbacks include the specialized equipment, costly refractories and binders, many operations to make a mold, and occasional minute defects.
Material:
Alloy Steel:ASTM 430;ASTM410;ASTM 416,ect.Carbon
Steel:WCB,AISI1020;AISI1045;S355J2G3,S235JR,ect.
Stainless Steel:SS304;SS316;SS316L;17-4 PH;ect.Copper:C21000;C26800;C27000;C27200,ect.
Advantage
Can form complex shapes and fine details Many material optionsHigh strength partsVery good surface finish and accuracyLittle need for secondary machining
Applications:
Turbine blades, armament parts, pipe fittings, Lock Parts , handtools, agriculture parts,Marine Parts,medical parts,hardware,automobile parts,ect.
Investment Casting
Investment Casting,Investment Casting Materials,Impeller Investment Casting,Wax Investment Casting
Ningbo City Yinzhou Ruican Machinery Co.,Ltd , https://www.kstcasting.com