- 瑞瑞爱吃桃
-
-92-75
= -18是错误的
应该等于-167
你这道题你没加括号
减去一个数等于加上这个数的相反数
两个数求和
同号相加符号不变,数值等于这两个数的绝对值和
异号相加符号取绝对值较大的那个数的符号,结果的数值是大数值减去小数值
- 小教板
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,moncler cheap
Spiral bevel gear tooth inclination (TRL) of the theoretical analysis
d wave of technology and ultra-deep-hole drilling inspection program Zhangzeng Liang Zhao Xianzhong NC (North China Institute of Aerospace, Langfang 065000, China) Abstract: A method of ultra-deep hole processing technology. Chip breaking at a certain length, and using three chip, chip design process. Improve the drilling efficiency and prevent broken drill bit. Key words: ultra-deep hole machining chip-breaking chip NCPr0grammingofUltra-deepHoleDrillingZHANGZengliang, ZHAOXianzhong (NorthChinaInstituteofAerospaceEngineering, Langfang065000, CHN) in machining will always be the super-deep hole machining (hole depth to diameter ratio greater than 8) problem. CNC deep hole machining chip breaking and chip problem is. Does not solve the problem of chip breaking and chip will cause the bit to break. Once the drill breaks, it will reduce production efficiency, increase processing costs. CNC milling machines and machining centers have a deep hole drilling system, a fixed cycle instruction,moncler jackets sale, but these instructions apply only to drilling cycle deep hole machining in general, not suitable for ultra-deep holes. In this paper, ultra-deep hole processing solution methods and programming. And to FADAL processing system as an example is given. An ultra-deep hole machining process for treatment of a certain size of every chip breaking,mbt shoes sale, after a number of off chip after chip. Drilling procedures to make practical,tory burch shoes, BTA deep drilling depth increases with the size should be gradually reduced. To make the program simple, you can set the length of a chip breaking, three chip length. The length of the same break chip, chip removal conveyor length is divided into 1st, 2nd and 3rd chip length after the chip length. Reach a length of each chip breaking, the drill stops feeding and a fixed time delay, and then continue drilling. Chip length to drill out the workpiece, chip removal and cooling, chip removal to a rapid decline after the end of the hole ahead of a distance (eg 0.5mm), cutting the feed to the next chip length, has not been reached after three chip drilling depth, the length of drilling a third-class chip, chip, until the depth dimensions. 3 Conclusion redesigned by comparing the known (Table 1), tooth root strength of the small end of the ferry tilted higher than the standard contraction of teeth, tooth contact ratio between the two are equal, the midpoint of the whole tooth, tooth equal work. Strength of the spiral bevel gear tooth width at the midpoint of the check, so the contact between the two equal strength and bending strength. Tilt the tool wear of tooth root tooth smaller than the standard contraction, so the actual production process design of gear tooth blanks tilt is a more advanced design methods. Tilt is a tooth cutter with a redesign of an existing profile parameters, to balance the ferry large, small end strength, a new method for reducing tool wear. To prevent the gear in drive gear when interference with the short gear tooth root slant. Increased Gleason grinding (N. 137) of the processing range, the largest full-gear grinding deep 33mm, m = 18.612mm, then cylindrical diameter 810 ~ 890mm, it is necessary to promote. The actual design specifications of large spiral bevel gears often used the midpoint of the small helix angle,puma shoes, so that the axial force decreases gear, the smaller diameter cutter required, at this point should be noted that the scope of the existing processing equipment. This product is the midpoint of the original design spiral angle is 25. Theoretical and actual cutter radius cutter radius 266.07mm 266.7mm or less, zr_"uuO but beyond the scope of internal grinding. Therefore, we increase the midpoint of the helix angle is 32. To meet the range of processing, such theoretical radius of 316.12mm cutter cutter radius and the actual difference between the larger, processing the ferry terminal strength are significant differences between the size, tool wear large. Therefore, we must re-design the actual cutter tooth profile parameters, to balance the ferry large, small end strength, reduce tool wear, (increasing the midpoint of the helix angle means that the axial force increases, we must re-check bearing strength) . This method has been in the Luoyang River Gear Manufacturing Co., Ltd. HKUST application, made effective, subject to user acceptance. References 1 Tao Zeng. Spiral bevel gear design and processing. Harbin: Harbin Institute of Technology Press, 1989.2 Beijing Gear Works. Spiral bevel gears. Beijing: Science Press, 1974.3GleasonWorksBevelGearToothContactAnalysis & Others. 1972. First author: Wang Bin, male, born in 1970, Master, lecturer, mainly engaged in the precision CNC machine tools, design and development of large machine tools. (Edit Cai Yunsheng) (Received Date: 2008 A O1-14) ? 99 ?
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