C28000 is an ordinary brass drawn bar grade of copper alloy material. It has many excellent characteristics, its mechanical properties, good hot plasticity, cold plasticity is acceptable, good machinability, easy fiber fusion welding, corrosion resistance, but easy to corrosion cracking, low price.
C28000 has a higher strength than copper, good electrical and thermal conductivity, high corrosion resistance in air and fresh water, good plasticity, easy hot and cold pressure processing, easy to weld, forging and tinning, no stress corrosion cracking tendency.
Second, the requirements of high-precision hydraulic valves
High-precision flow control: hydraulic valve parts need to accurately control the flow of hydraulic oil to meet the needs of different working conditions. For example, in some precision machining equipment, the flow of the hydraulic system error will lead to a decline in machining accuracy.
Good sealing: In order to ensure stable pressure and efficient operation of the hydraulic system, the hydraulic valve must have good sealing. Any small leakage may affect the performance of the entire hydraulic system.
Wear resistance: hydraulic valve parts in the long-term working process, the internal spool and valve seat and other components will continue to friction, so it needs to have a strong wear resistance to extend the service life.
Corrosion resistance: the hydraulic system in the hydraulic oil may contain a certain amount of water and impurities, easy to cause corrosion. Hydraulic valve parts need to be corrosion-resistant to ensure stable work in complex working environments.
Third, C28000 in the application of high-precision hydraulic valve parts advantages
(A) mechanical properties
Balance of strength and plasticity The strength of C28000 is higher than that of copper, which makes it able to withstand the pressure that hydraulic valve parts are subjected to in the working process. At the same time, its good plasticity, both hot and cold, facilitates a variety of processing operations, such as processing it into the spool, seat and other complex shapes of hydraulic valve parts. In the manufacture of valve spools, which require fine processing and molding, C28000's strength and plasticity characteristics make it a suitable material choice.
Superior machining performance C28000 has good machinability, in the manufacturing process of high-precision hydraulic valve parts, a variety of machining methods can be used, such as turning, milling, grinding, etc., and can achieve a high degree of machining accuracy. This is essential for the manufacture of high-precision hydraulic valve parts, for example, the surface of the spool and seat can be machined very smooth, thus improving the sealing of the valve parts.
(ii) Physical properties
Thermal conductivity C28000 good thermal conductivity helps hydraulic valve parts in the working process of heat dissipation. When the hydraulic system works, the flow of hydraulic oil will generate a certain amount of heat, if the heat can not be distributed in a timely manner, it may lead to an increase in the temperature of the hydraulic oil, affecting the performance of the hydraulic oil and the normal operation of the valve parts.C28000's thermal conductivity can effectively conduct the heat out to maintain a stable working temperature of the hydraulic valve parts.
Electrical Conductivity Although electrical conductivity is not the most critical property in hydraulic valves, a certain degree of electrical conductivity is helpful in some special detection and control scenarios. For example, in some hydraulic systems with electrical control systems, the conductivity of C28000 can be realized through the monitoring of valve status and other functions. (C) Chemical properties
Corrosion resistance C28000 has high corrosion resistance in air and fresh water, which is very important for hydraulic valve parts. Hydraulic fluid in the hydraulic system may be mixed with a small amount of water or in some humid working environment, C28000 can resist corrosion, to ensure the structural integrity of hydraulic valve parts and performance stability. Even in the long-term use of the process, can also reduce the risk of failure due to corrosion.
Fourth, C28000 in the application of high-precision hydraulic valve parts challenges and solutions
(A) corrosion cracking problem
Although C28000 has a certain degree of corrosion resistance, but it is also prone to corrosion and cracking problems.
Countermeasures: In practical applications, C28000 can be used to improve its resistance to corrosion and cracking by surface treatment. For example, the use of electroplating a layer of corrosion-resistant metal (such as nickel) method, the formation of a protective film on the surface of the C28000, to prevent the external corrosive substances and C28000 matrix contact. At the same time, in the design of the hydraulic system, strict control of the quality of the hydraulic oil, reduce the content of corrosive impurities in it, also help to reduce the risk of corrosion cracking of C28000.
(B) Precision control
In the manufacture of high-precision hydraulic valve parts, to achieve very high dimensional accuracy and surface finish on the C28000 processing challenges.
Countermeasures: On the one hand, advanced processing equipment and processes can be used. For example, use high-precision CNC machine tools for machining, and optimize the machining parameters, such as cutting speed, feed and depth of cut, to improve the machining accuracy. On the other hand, strict testing and quality control after machining, such as the use of three coordinate measuring machine and other precision measuring equipment to test the processed hydraulic valve parts, for products that do not meet the accuracy requirements for timely rework or scrap processing.
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