? Brief introduction to the cleaning of the hydraulic valve manufacturing process

Hydraulic valve manufacturing process, the use of matching methods to improve the accuracy of the assembly, after a number of processing components, such as the valve body and spool, based on the actual size to select the most appropriate with the gap one pair assembly to ensure good spool sliding and sealing performance. In other words, the same type of hydraulic valve spool and valve body with the size, there are some differences in the use of enterprise, when a large number of a certain kind of failure of hydraulic valves, all valves to disassemble and clean, check the measurement of various parts, parts are classified based on test results, according to the following methods to re-combination of matching.

Hydraulic assisted machining include: the body of sand, parts deburring, to heat the contents of the residues and cleaning.

1, the body sand

The vast majority of domestic hydraulic valve body, ductile iron, vermicular graphite cast iron, gray iron as a material made ??of resin sand foundry casting as the modeling medium, small size, compact structure, shape complexity and accuracy require high quality of the castings very large extent determines the grade of hydraulic valves. Body due to the sand as the molding material, it is inevitably casting sticky sand. Sticky sand dangers for a hydraulic system. More clear sticky sand, commonly used in hydraulic pump drum sand, sand shot peening, electrochemical sand and water blasting sand. The shot blasting sand are generally used for the sand of the oil passages open or oil duct larger body and roughing valve body, it can not only remove the sticky sand, but also to remove the rust and rough burr, In particular, liquid blasting, light decoration but also from the casting surface effect. Electrochemical clear sand (SiO2) with molten NaOH from the electrochemical reaction of sodium silicate and water, compared to a net removal of narrow oil passages within the sticky sand, so the shot peening and electrochemical sand these two methods widely used for the manufacturer to fine to the sand as the valve body casting. But neither of these sand cleaning method inadequacies: (1) sandblasting sand for large oil chamber or the oil passages to open the valve body have greater limitations on the complex structure, and a small oil passages, the valve hole, can not effectively remove the sticky sand, and easy to damage the machined surface, and therefore affect the tightness, aesthetics and precision products, and not conducive to the arrangement of the processing operations; (2) electrochemical sand on some non-circulating cavity is difficult to to the net sticky sand, and high energy consumption, devastating the environment, the operating strength of the workers is also high, so the complex parts of sand are still being explored.

2, slide valve parts deburring and to the heat treatment residues

Another major problem of the hydraulic components assisted processes to the machining burrs, heat treatment residue. The presence of burrs, hydraulic pressure will cause adverse effects, such as stem clamping orifice blockage, especially the chrome-plated class stem balance slot grinding burr radial fluid power with the oil fleeing the stem and the gap of the valve hole, not only fail to eliminate the fluid power, but will cause the stem clamping operation force to increase the system pressure instability, micro-performance and pressure modulation performance.

Machining should be used to control the generation of burr cutting parameters should be arranged process resulting burr removal, deburring methods: manual method vibration polisher, abrasive belt grinding, wire wheel or grinder polishing, stainless steel wire brush polishing method, the liquid sandblasting. The choice of methods should be considered the actual situation. Relatively speaking, the body parts using the ball nylon brush or stainless steel wire brush to remove the burr of the valve hole, before fine hinge hand drill clamped brush to remove the cut groove, crude hinge sequence generated by the burr. Abrasive belt or wire wheel to go outside the body surface grinding burrs and rust is more desirable for some coarse grinding flash should be steel saw blade to scrape the cavity burr can be liquid blasting method to clean up, quenching parts available special tool or wire brush to remove oxides generally after quenching vibration polisher or pickling to remove, of course, pickling should be based on different materials with different acid and adding suitable degreasing agent and corrosion inhibitors.

3, hydraulic valve parts cleaning

Cleaning of the hydraulic valve parts in the production of hydraulic components is a key support processes, and its quality constraints of reliability and stability of the hydraulic valve. The quality of cleaning and cleaning methods, the preparation of the cleaning fluid, cleaning equipment and personnel responsible have a great relationship.

Hydraulic valve-assisted processing is a complex systematic project, it involves a very wide range, not only to provide protection from the device, the continuous technical practice, summarize, and improve. Seriously but also from the management really grasp, to manage, the only way to the secondary processing of the hydraulic valve boost related to the content here is just some thoughts from experience, I hope to be able to ancillary domestic hydraulic valve processing to improve the quality of some benefit. Information about recommended: IMD molding machine ? Four-poster board hydraulic oil press http://www.ktchyd.cn

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