Abrasive Lapping film is a type of polishing material used for fine abrasive finishing and polishing of surfaces. It is often employed in applications where a high degree of precision and surface quality is required. The key characteristics and applications of abrasive lapping film:
Composition: Abrasive Lapping film typically consists of a flexible backing material onto which abrasive particles are evenly coated. The abrasive particles can vary and may include materials like aluminum oxide, silicon carbide, diamond, cerium oxide, or other abrasives.
Manufacturing Process: The film is manufactured using advanced coating technology, ensuring a uniform distribution of abrasive particles on the backing material. The film may undergo high-precision cutting technology to achieve specific sizes and forms.
Grit Sizes: Similar to the Aluminum Lapping film mentioned earlier, abrasive lapping film comes in a range of grit sizes, from coarse to very fine. This allows for flexibility in addressing different levels of surface roughness and polishing requirements.
Particle Sizes: The particle sizes of the abrasive material on the film can vary, typically ranging from larger micron-sized particles to smaller nano-sized particles, depending on the desired level of abrasiveness.
Versatility: Abrasive lapping film is versatile and can be used on various materials, including metals, ceramics, plastics, and optical components. It is commonly utilized in precision machining, electronics, optics, and other industries where fine surface finishing is crucial.
Adhesive Backing: Some lapping film come with a Pressure Sensitive Adhesive (PSA) backing, allowing for easy attachment to lapping plates or other polishing equipment.
Applications:
Uniform Dispersion: Similar to other precision lapping films, uniform dispersion of abrasive particles is critical for achieving consistent results in surface finishing. This ensures that the abrasive action is evenly applied across the entire surface.
Customization: Like other lapping films, abrasive lapping films may be available in sheets, discs, or rolls, providing flexibility for different types of polishing equipment and applications. Customized products may also be available to meet specific customer needs.
Overall, abrasive lapping film is a valuable tool in industries where achieving a smooth and precise surface finish is essential. Its use is widespread in applications requiring fine polishing and finishing of various materials.
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1 Overview Quick-closing butterfly valve hydraulic drive device can solve the electric cut-off butterfly valve and check valve can not be off (> 1s) caused by the turbine speeding problem. When the unit accident, the fast closing butterfly valve hydraulic drive device can quickly drive the valve closed, effectively prevent steam turbine tail steam and condensate back into the water, instantly cut off the pipeline to protect the steam turbine. It can be seen that the fast closing butterfly valve hydraulic drive device is a safety device, to ensure its normal operation is very necessary, the correct method of maintenance and repair equipment to ensure the normal operation of the necessary conditions, the following describes the quick closing butterfly valve hydraulic drive Maintenance methods and maintenance points. 2 Maintenance methods Quick close the butterfly valve hydraulic drive normal operation requires routine maintenance, if you do not pay attention to the routine maintenance of equipment, quick closing butterfly valve hydraulic drive prone to failure. The operator should always observe the hydraulic system pressure, noise, vibration, oil temperature, oil level, voltage, travel switches and leaks and other issues, if problems are found to be promptly resolved. Suitable maintenance methods can reduce the failure of the quick-closing butterfly valve hydraulic drive, prolong the service life of the quick-closing butterfly valve hydraulic drive, and the daily maintenance of the quick-closing butterfly valve hydraulic drive mainly includes the following aspects. (1) fast closing butterfly valve hydraulic drive installation is complete, when filling the tank, be sure to follow the instructions given by the brand refueling, if you want to use other oil substitute must be confirmed by the manufacturer before they can be changed, the new Of the oil products have to go through the filter to enter the tank, requiring the system oil level of pollution reached NAS8 above. (2) Close the butterfly valve hydraulic drive installed in the first run after the completion of the operation, to confirm the direction of the motor is correct. It can be judged by jogging the motor. If the direction is inconsistent with the direction required by the manual, the wiring should be changed. Do not turn on the motor for a long time before confirming the correct motor direction to avoid damage to the pump. (3) fast closing butterfly valve hydraulic drive installed in the first run after the completion of the operation, the relief valve should be completely loosen, and then slowly increase the pressure to 1MPa increments and run in each pressure section 5min, confirm No abnormalities and then to increase until the instructions to meet the pressure requirements. Pressure test during the failure should be promptly ruled out. Troubleshooting must be done after pressure relief. If the weld seam needs to be re-welded, the piece must be removed, except after the net oil can be welded. (4) Do not adjust the system pressure while the actuator is in motion. Before the pressure regulator should check the pressure gauge, pressure gauge system is not allowed to pressure. After adjusting the pressure adjusting screw should be locked to prevent loosening. To regularly check the pressure gauge is correct and reliable. (5) Quick Close Butterfly Valve Hydraulic Drive Before the first operation after the installation is completed, it is necessary to fill the gas pressure in the accumulator with nitrogen to the pressure required by the instructions. Do not use oxygen instead. Otherwise, serious accidents will result. Equipment in the transport process does not allow accumulator pressure, so easy to explode. (6) Check the tank level regularly (one month). The first refueling proposal is added to the full level gauge, under normal working conditions, the oil level requirements in the level gauge above the height of 1/2, below the level of 1/3 the height must be refueling, with "low level" When controlling the protection, the oil source system will stop working when the liquid level is too low, and the system will not restart until the fueling reaches the required scale. (7) The gas pressure in the accumulator should be inspected periodically (one month) at the beginning. Nitrogen gas should be supplemented below 10% of the inflation pressure required by the manual so that the nitrogen pressure reaches the pressure required by the instructions. Six months later, check the gas pressure in the accumulator in the first quarter. (8) In the process of production and operation of the hydraulic drive device of fast closing butterfly valve, attention should be paid to the changes of the oil quality. Sampling tests should be conducted regularly (every quarter). If you find the oil does not meet the requirements, timely purification or replacement of new oil, the system requires the degree of pollution of the oil to maintain NAS8 above. (9) often check the fast closing butterfly valve hydraulic drive power supply voltage, power supply voltage fluctuation range of ± 10% of the rated voltage. Pay special attention to the supply voltage of the solenoid valve, the power supply voltage deviation within ± 10% of the rated voltage to ensure that the solenoid valve can operate normally. (10) often check the fast-closing butterfly valve hydraulic drive each filter. Found oil pollution alarm, timely replacement of the filter cartridge. If found serious damage to the filter, you must replace or filter tank fluid. (1.) After the hydraulic actuator of the quick closing butterfly valve is put into operation, it is necessary to regularly observe the operation of the device locally. If any fault indication, oil leakage and other abnormalities occur, it shall be disposed promptly. (12) According to the design requirements and work requirements, reasonably adjust the working pressure and working speed of the hydraulic drive device of the quick-closing butterfly valve. Pressure valve, speed control valve transferred to the required value, the adjustment screw should be tightened to prevent loosening. (13) Close the butterfly valve hydraulic drive device should pay attention to moisture, anti-loose, anti-corrosion, dust and crash and so on. (14) Close the butterfly valve hydraulic drive oil working temperature shall not exceed 55 ℃, if the oil temperature exceeds 55 ℃ must find out the reasons to be resolved. (15) Close the butterfly valve hydraulic drive high-pressure hose and seals to be replaced regularly (usually 2a). (16) often check the pressure relay and travel switch action is normal, if not normal to be replaced. 3 Maintenance Points Fast-closing butterfly valve hydraulic drive in the event of failure, timely repair, maintenance should pay attention to the following points. (1) fast closing butterfly valve hydraulic drive failure should be based on the hydraulic schematic and electrical schematic diagram carefully analyzed to identify the point of failure, to determine the method of maintenance. (2) When replacing the hydraulic components or piping or seals, the accumulator pressure oil should be drained to avoid fuel injection or wounding accident. (3) The electrical components should be replaced, you should turn off the power, so as to avoid electric shock accidents. (4) If it is necessary to replace the hydraulic components and electrical components, check the model number, identify the component storage time and custody of the environment, should pay attention to the degree of aging inside the components, if necessary, washable, replace and conduct performance tests. (5) If it is necessary to repair the screw-in cartridge valve, understand the principle and structure before disassembly. When disassembling, use a suitable opening sleeve to unscrew on the three-jaw chuck. When assembling, also use the appropriate opening sleeve in three Tweezers claw chuck, the thread assembly at the assembly but also the use of removable thread locking agent. (6) If you need to replace the two-way cartridge valve, remove the valve sleeve to use special tools, or difficult to disassemble. In the assembly of two-way cartridge valve, to be coated with lubricating oil, slowly push with screws and cover, do not knock into. (7) maintenance of hydraulic components to check the connection bolts used in the material and strength reached