tailieunhanh - Volume 16 - Machining Part 17

Tham khảo tài liệu 'volume 16 - machining part 17', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Prepared proprietary oils that contain buffers are widely used. Before use these oils which may also contain rust inhibitors and deodorants are diluted up to 95 with kerosine. The use of too much buffer may detract from its beneficial effects. An excessive amount Reduces the cutting action of the abrasive Produces smoother finishes Requires higher pressures or lower rotational speeds Lowers the ability of the fluid to dissipate heat Impairs fluid distribution Increases requirements for refrigeration and filtering Regardless of the type of fluid used it should be delivered to the honing stones in a constant and generous supply. The fluid also should be filtered through a system that removes particles coarser than 15 . - m 600 in. . The system should be kept free of water and stray oil such as from the hydraulic system which adversely affect the properties of honing fluids. In many plants 17 to 20 C 62 to 68 F is the preferred temperature range for honing fluids. Controlling the temperature becomes more important as tolerances become closer. If temperature is allowed to rise dimensions may become inaccurate and the fluid may break down causing excessive stone wear and changes in cutting characteristics. In production installations heat exchangers are often used to maintain close control of honing fluid temperature. Dimensional Accuracy Internal honing to tolerances of to mm to in. is common. For some high-precision parts tolerances as close as a few millionths of an inch are specified and achieved. Close tolerances can be produced and repeated in fixtured honing power stroking if sources of variation such as machine and honing fluid condition are closely controlled as described in the example below. Example 1 Variations in Dimensions and Finish for 900 Cylinder Blocks. The data plotted in Fig. 19 represent results of a quality control check made on mm in. diam cylinder bores in gray iron blocks for V-8 engines. Bores 2 and 7 were

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