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1、时光荏苒,岁月如白驹过隙,不经意间,我们即将从多彩的大学毕业,完成一个从大学生到社会人的转变。四年的大学生涯,让我明白了许许多多的科学知识和人生哲理,以及数不尽的感悟和成长。然只有将所学的理论知识付诸于社会的实践,才能检验和实现理论自身的价值,也只有将理论付诸于实践才能使理论得以检验。同样,一个人的价值也是通过实践活动来实现的,也只有通过实践才能锻炼人的品质,彰显人的时代风貌。而毕业实习作为大学的最后一课,也是最后一刻,我倍加珍惜,从而可以较深层次的理解社会,以便为将来能更好的胜任工作打下坚实的基础。附录Numericalcontrolsystemdevelo
2、pmentbriefhistoryandtendency In1946wasbornintheworldthefirstelectronicaccountingmachine,thisindicatedthehumanitycreatedhasbeenpossibletostrengthenandpartiallytoreplacethementallaborthetool.Itwiththehumanitythesewhichintheagriculture,theindustrysocietycreatedonlyisstrengthensthephy
3、sicallaborthetooltocompare,gotupthequantitiveleap,enteredtheinformationsocietyforthehumanitytolaythefoundation. After6years,namelyin1952,thecomputertechnologyappliedontheenginebed,werebornthefirstnumericalcontrolenginebedinUS.Fromthistimeon,thetraditionalenginebedhashadthearcheryta
4、rgetchange.Sincenearlyhalfcentury,thenumericalcontrolsystemhasexperiencedtwostagesandsixgenerationofdevelopment. Theearlycomputeroperatingspeedislow,wasnotbigtothensciencecomputationandthedataprocessinginfluence,butcouldnotadapttheenginebedreal-timecontrolrequest.Thepeoplecannotbu
5、tusenumerallogiccircuit"Builds"Becomesanenginebedspecialpurposecomputertotakethenumericalcontrolsystem,iscalledthehardwareconnectionnumericalcontrol(HARD-WIREDNC),iscalledforthenumericalcontrol(NC).Alongwiththeprimarydevicedevelopment,thisstagehashadbeenthroughrepeatedlythreegenerat
6、ions,namely1952firstgenerationof--electrontube;1959second-generation--transistor;1965thirdgeneration--smallscaleintegrationelectriccircuit. To1970,thegeneralminicomputeralreadyappearedandthemassproduction.Thereupontransplantsittakesthenumericalcontrolsystemthecorepart,fromthistime
7、onenteredthecomputernumericalcontrol(CNC)thestage("whichshouldhavethecomputerinfrontof;General"Twocharactershaveabbreviated).To1971,时光荏苒,岁月如白驹过隙,不经意间,我们即将从多彩的大学毕业,完成一个从大学生到社会人的转变。四年的大学生涯,让我明白了许许多多的科学知识和人生哲理,以及数不尽的感悟和成长。然只有将所学的理论知识付诸于社会的实践,才能检验和实现理论自身的价值,也只有将理论付诸于实践才能使理论得以检验。同样,一个人的价
8、值也是通过实践活动来实现的,也只有通过