Third, the application examples of deep nitriding of gears and recommended application range
For many years, Zhengzhou Machinery Research Institute has carried out many fruitful work in the industrial application of deep nitriding of gears. The gears have a modulus of 2.5 to 10 mm, an accuracy of 5 to 7 and a high line speed of 118 m/s. The shape has straight teeth, helical teeth, double arcs, spiral bevel teeth, inner ring gears, non-circular gears and worms. The following are two practical applications of deep nitriding, as shown in Figures 9 and 10, respectively. Example 1: Zhenhai Petrochemical Plant has an annual output of 2.5 million tons of main fan high-speed double arc gear, gear module 4.5mm, line speed 118m / s, load factor 1.63kN / m 2 , material 34Cr Ni3Mo, surface hardness 620 ~ 650HV, The effective hardened layer has a depth of 0.8 mm and a brittleness level of 1. Example 2: Baosteel Coking Plant main winch reducer input shaft gear, gear module 9mm, precision 7 grade, material 25Cr2MoV, surface hardness 730 ~ 760HV, effective hardened layer depth 0.85mm, brittle 1 level.
Based on years of research in the field of gear nitriding and the application experience of actual engineering, it is recommended to select the gear nitriding process under the following working conditions (see Table 3).
Fourth, the conclusion
Although the deep nitriding process has been applied to the gear to a certain extent, there are still many problems to be solved. In addition to the influence of the traditional concept, the cooperation of hot and cold processing is required. Due to the improvement of the hardness of the matrix, The tooth making process and the knife have new requirements; the process of grinding the teeth is omitted, and the deformation should be minimized, not only in the process of nitriding process, but also in the previous process, such as before the finishing process. Stress tempering and other measures. In order to master and apply the deep nitriding process more skillfully, it is recommended to work hard from the following points:
(1) Selection of raw materials At present, domestically available steel materials are limited, and some steel types are not easy to purchase. It is necessary to develop some special steel materials for gear nitriding, such as precipitation hardening steel, which can further improve the hardness of the matrix during nitriding. .
(2) Process research Further increase the seepage speed, increase the depth, reduce the deformation, and explore new processes.
(3) Data accumulation Explore the relationship between tissue and fatigue performance, accumulate the mechanical performance data of nitriding gears, and constantly improve relevant standards.
(4) Equipment development Establish an expert intelligent system for gear nitriding, improve the control level of equipment, and solve the problem of low automation under mass production.
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Linear motion is the most basic of all motion. Linear ball bearings provide linear movement in one direction.
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Ball Bearing slides are the most common type of linear slide. They use self-lubricated ball bearings housed in the base. This arrangement offers smooth precise movement along a single-axis linear design. Typically constructed from aluminum, hardened cold rolled steel or galvanized steel, ball bearing slides consist of two linear rows of ball bearings contained by four rods located on opposite sides of the base, which support the carriage for smooth linear movement. This low-friction linear movement can be powered by a drive mechanism, by hand, or inertia. Ball bearing slides have a lower load capacity compared to other linear slides, this is because the balls are less resistant to wear and abrasions. Ball bearing slide applications include fragile instrumentation, robotics, cabinetry and appliances.
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