Processing of the auxiliary hydraulic valves – hydraulic valves, hydraulic – mechanical industries
Domestic engineering, material handling equipment demand With the rapid development of more and more, engineering, the two hosts crane manufacturers have to meet all of China after accession to WTO entry of foreign brands, have committed to developing new products, expand markets, improve product quality, enhance products, and now the OEMs on the components and the quality and coordination, in particular the reliability of quality parts and components have become increasingly demanding, as a host base accessories of Hydraulic valve , Compared with the performance of foreign brands, the shortfall is poor reliability, easy to leak. Hydraulic pressure to oil as the working medium of the system more sensitive to pollution, the complexity of troubleshooting, thus supporting the quality of processing is particularly important, more and more attention by the OEMs.
As secondary processing to remove the sticky material sand, burrs and other hydraulic components and systems will bring the following effects: (1) work with the host to keep the change, vibration, sticky sand, burr will fall off at any time , while the oil and cause pollution system cards valve, cylinder and filter plugging, which is leading to poor reliability of the relevant host Key Factor; (2) reduce the pass rate of valve assembly components, affecting production efficiency; (3) reduced Body With paint adhesion, the impact of product aesthetics. Foreign hydraulic parts manufacturers attach great importance to the auxiliary processing, auxiliary input processing production costs accounted for 20% to 30% or even more.
In the country, some hydraulic parts manufacturing plant to assist in the processing does not pay enough attention to, the use of simple equipment and poor quality of personnel, methods, than the original, which seriously hampered the quality of secondary processing of domestic and foreign famous brands of hydraulic valve hydraulic valve the quality of the process of closing the gap. How to improve the quality of secondary finishing processes, improve cleanliness levels to ensure product quality, reliability, hydraulic valve manufacturer is facing a difficult problem, the actual situation in our plant here, on the hydraulic valve on auxiliary processing point of view, and counterparts to discuss, to improve the quality of the products of domestic hydraulic parts.
Auxiliary hydraulic pressure processing include: sand body, parts deburring, and cleaning residue to heat treatment, etc
1, body like sand Vast majority of domestic hydraulic valve body with ductile iron, vermicular iron, gray iron material as the resin sand molding medium skillful in casting, with small size, compact structure, shape, complex and require high precision, castings largely determines the quality of the grade of hydraulic valves. Body, due to the sands as the molding material, so casting a sticky sand that inevitably exist. Sticky sand on Hydraulic System Harmful for the larger. Remove sticky sand method more commonly used in China have drum sand, blasting sand, sand and water blasting electrochemical clean sand. Shot and sand are generally used for oil or oil Road Road, open to the larger body type and the rough sand after the valve body, it can not only remove the sticky sand, also remove the rust and rough glitch, in particular, liquid sand, but also the role of casting surface from the light decoration. Sand is the use of electrochemical (SiO2) with molten NaOH from the electrochemical reaction of sodium metasilicate and water, can be more narrow net to remove the sticky oil channel sand, so sand blasting and electrochemical methods of these two valve body casting sand as fine to the method, widely used for various manufacturers. However, there are two methods of sand shortcomings: sand blasting chamber for oil or oil in large open body Road, on the complex structure, oil duct valve hole so small There were some limitations, can not effectively remove the sticky sand, and easier on the machined surface damage, Guer affect the sealing, aesthetics and product accuracy, and not conducive to manufacturing processes of the arrangements; electrochemical sand on some very difficult in terms of non-circulating chamber stick to the net sand, and high energy consumption, environmental damage great, the workers operating the high intensity, so the complex parts sand and people still being explored.
For small complex sand castings, the author describes a method for reference: artificial aging – acid – rinse – rust – ultrasonic cleaning. Its mechanism are: the use of artificial aging to a combination of casting and sand is reduced by using acid to remove sand and casting oxide binding sites, so that sand and the casting stripped, re-use ultrasonic cleaning burst of compressed air in order to sand off to achieve the purpose sand.
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