1 Introduction China's various mechanical equipment on the bearings, bushings, long-term widespread use of tin bronze, for example, various types of gear pumps, ZCuSn6Pb6Zn3 or ZCuSn5Pb5Zn5 tin bronze casting sleeve has been rough, machined and then lead-plated Processing technology, and then assembled to use, the production process is complex and costly. In response to this situation, we have developed a new type of sliding bearing alloy (code TZS88), instead of tin bronze cast bearing bushings, billet rough, assembled directly after machining, process is simple, reduce the production cost of the sleeve over 50%. 2 TZS88 alloy composition and properties (1) TZS88 alloy composition The alloy based on aluminum, containing Cu, Sn, Ni, Fe, Ti ... and other elements, after appropriate treatment, it has high strength, hardness, plasticity And superior sliding bearing performance. (2) TZS88 alloy performance A number of performance data TZS88 alloy tested, listed in Table 1, with several commonly used conventional plain bearing alloy for comparison. As can be seen from Table 1, TZS88 alloy has the same strength, hardness and plasticity as tin bronze; its friction coefficient is much lower than that of tin bronze and close to that of tin-base Babbitt alloy; its thermal conductivity is obviously superior to that of tin bronze and tin Kiba's alloy; density is only 1/3 of tin bronze. The data in Table 1 shows that the TZS88 alloy has excellent sliding bearing performance and can replace the bronze to make integral material such as bushings and bushings. 3 TZS88 alloy sleeve in the gear pump production and application (1) TZS88 alloy sleeve gear pump development test CB50 gear pump selected for the test object, the rated speed n = 1500r / min, the rated pressure p = 10MPa and p = 16MPa two kinds. May 1993, the two gear pump TZS88 alloy sleeve rough, according to the original design drawings processing qualified, respectively, for the assembly of 100 units for the sampling test. According to the provisions of the gear pump industry standards promulgated by the former State Machinery Industry Commission, the two kinds of gear pumps were respectively carried out unloaded displacement test, efficiency test, over speed test, overpressure test, high temperature test, high temperature impact test, high temperature overload test , External leakage inspection test and disintegration inspection test. After successfully completing the above test items, the disassembly inspection of the two gear pumps tested indicated that there is no fatigue damage on all the main parts, no burns, flaking and obvious scratches on each friction pair, and the signs of the pump body swept no more than two Shaft center connection, in line with gear pump industry standards. (2) TZS88 alloy shaft sleeve gear pump durability test After the success of the development of the two gear pump test, and then random one pumping durability test. ①test equipment: CB50 pump life test bed. ② Test conditions Test pressure: gear pump rated pressure of p = 10MPa and p = 16MPa two; test speed: n = 1500r / min; Test Fluid: N46 # antiwear hydraulic oil (viscosity ν40 = 39.9mm2 / s ); Test oil temperature: 80 ℃ ~ 90 ℃; Impact frequency: 25T / min. ③ gear pump durability test conditions In the above test conditions, respectively, on the two CB50 gear pump successively conducted durability impact test. During the test, the gear pump tested had no external leakage and other anomalies. The impact times of the two kinds of gear pumps exceeded 400,000 times. At 50 ℃, the volumetric efficiency of the gear pump with p = 10MPa was 92.3% and the volume efficiency of the gear pump with p = 16MPa was 92.20%. 4 TZS88 alloy sleeve gear pump production and application of the situation with TZS88 alloy sleeve assembly rated speed n = 1500r / min, the rated pressure were p = 10MPa and p = 16MPa two types of CB50 gear pump, in the development of test And durability test after the success of each assembly of 100 units, through the factory inspection, mark on the market tracking the use of information collection. After using the user for up to one year, it shows good results. As a result, we gradually expand production of TZS88 alloy sleeve, gear pump assembly on the market. Since 1993, TZS88 alloy replaced ZCuSn6Pb6Zn3, ZCuSn5Pb5Zn5 tin bronze production bushings equipped CB50 gear pump, to December 1998, the number of put on the market has reached more than 50,000 units. 5 TZS88 alloy sleeve economic benefits analysis TZS88 alloy density is only 1/3 of tin bronze, the same weight of TZS88 alloy compared with tin bronze, the former volume is three times the latter, the former can produce the same size The number of bushing must also be three times the latter. Electrolytic copper, the main raw material for melting tin bronze, is much higher than pure aluminum, which is the main raw material of TZS88 alloy. The melting temperature of TZS88 alloy is lower than 800 ° C and the melting temperature of tin bronze is higher than 1100 ° C. Obviously, the energy consumption of the former is lower than the latter ; Made of tin bronze gear pump sleeve, machining must also be carried out after the lead-plated lead, but with TZS88 alloy sleeve does not require plating lead. Based on the above factors, it can be considered that the use of TZS88 alloy instead of tin bronze gear pump sleeve, can reduce production costs at least 50%. 6 Conclusion TZS88 sliding bearing alloy, with excellent sliding bearing performance, can replace part of the copper alloy (such as ZCuSn6Pb6Zn3, ZCuSn5Pb5Zn5, ZCuSn10P1, etc.) to create the overall material of the bearing bushings, can be used at higher sliding speeds and higher work Temperature (such as gear pumps, etc.) working conditions. Using TZS88 alloy to replace part of tin bronze to manufacture bearing parts such as bearing bushings and bushings can at least reduce the production cost of bushings by more than 50%.
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