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Plus oxygen gas nitriding in the impact of various factors on the nitride


1O18A15A ~ B2.021B425924 total gas flow rate of 45 steel materials, heating equipment 25kW well furnace, 570C × 2h, oil cooling, add ammonia, oxygen is 1. Table 4 lists the total gas flow (equivalent air exchange rate was 9 ~ 15) and the nitriding depth and performance relationship. Shows the results of the total gas flow rate on the nitrogen have little effect. This feature of the process parameters to ensure the stability of great practical significance nitrogen tank at any time ask to extend constantly aging,[link widoczny dla zalogowanych], and the results will result in the closing date = 2000 for a ll bud of a 15 t of gold mediated by Phan (1967 a) , F,[link widoczny dla zalogowanych], Lei Hua, Zhejiang, lecturers, \the rule of the whole University, Wuhan 430081, China) Abstract mining village of cone bit bearing system breakdown common set of phenomena, through the semi-hardening effect and optimization of process parameters, toughness too mention commercial rate, the rupture rate of decline in the traditional 90 to 96 to 7 ~ 13 meters in drill hole channel increased l7. Key words: cone bit; village sets; semi-hardened; toughness in the Circuit DOI: TG162.7 Document code: B Article ID :1001-3814 (2001) 02-0059-021 Introduction roller bushing is mine bit bearing system is an important part in one of its embedded in the cone bore, claw and tooth axis of a pair of small sliding friction. Bush bear radial load roller 15 (> 9800N), repeated impact load, and dry grinding conditions in service. Therefore, the requirements of the friction surface of high hardness, good wear resistance,[link widoczny dla zalogowanych], while the Ministry of toughness and heart. American Hughes Crl7 or Crl7Ni2 similar steel production in China, the carburizing quenching using the phenomenon of brittle fracture of a small mouth. As required by Crl7 or CrlTNi2 temperature carburizing of steel, China's mining rock bit manufacturers to use more high-speed under the same conditions increased the decomposition rate of ammonia, and ammonia decomposition rate is a nitridation process parameters must be controlled. In the nitriding temperature constant conditions, in order to ensure that the required scope of the decomposition rate is the only way to regulate the flow of ammonia, but these features just to meet this requirement. Table 4,[link widoczny dla zalogowanych], total gas flow rate on the chloride depth and properties of the gas (mS / h) l fu ship surface hardness of the diffusion layer depth (m) (HV005) 030I21 ~ 240270.372i ~ 24l063044} 24 ~ 2703l57890.51I21 ~ 240. 3l5789058l04038g3 Figure 1 shows several commonly used steel at different temperatures and oxygen to the body time to increase the surface hardness after nitriding conditions for reference. Temperature (℃ when the Q (h) Figure 1 at different temperatures common actinides (a) different time (b) hardness after nitriding steel production, but a large number of anatomical analysis, fracture is serious,[link widoczny dla zalogowanych], is attributed to lack of toughness, which is lead to bit one of the reasons for premature failure of bearings. To enhance the toughness of bush reserves, especially on W18Cr4V, W6M05Cr4V2, W9Mo3Cr4V2 high speed steel properties of the semi-hardening process, with optimized toughness and hardness of the optimum process parameters to improve the bit life. 2 in the laboratory test methods to measure the current high-speed steel toughness after heat treatment there are many ways mouth], power is often measured fracture toughness as measured by an index of high-speed steel. The test subjects directly to the bush to choose a significant effect on toughness. the quenching temperature and temperature are two factors nursery fire, were taken to different levels of semi-hardened quenching of bush, garden fire (parameters see Figure 1), optimized by orthogonal test temperature parameters . when the http Figure 1 bush quenching and tempering process of a test in WE 60 universal testing machine, slow loading test before taking the load break bushing (dead) and the reduction rate (S), with its broken power (PXS) as the toughness index (measured three villages each test set, the arithmetic mean value). It can more accurately reflect the bush in a different heat treatment conditions on the toughness. test device shown in Figure 2. Figure 2 Schematic diagram of compression test bush Received Date: 2o0o-lz-19 rose from the barrel of good Pai (1955 -), a man and a city in Shandong Gao. Associate Professor. has published over 15 articles. research project won the second invention of Wuhan Municipal Government Two awards, the results show the invention concern Ji made a first-class favorite and so on.

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