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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Kietlydynio peilio patvarumo tyrimai aušinant tepimo ir aušinimo skysčiu su skystųjų kristalų priedais / Research of tool life of carbide lathe tool lubricated with coolant with liquid crystals additives

Strolia, Vaidas 22 June 2010 (has links)
Baigiamajame magistro darbe ištirta skystųjų kristalų (cholesterolio stearatas) priedų prie tepimo ir aušinimo skysčio (TAS) įtaka kietlydynio peilio nudilimui ir apdirbto paviršiaus šiurkštumui tekinimo operacijoje. Ištirtas sriegiklio pasipriešinimo momento kitimas sriegiant skyles rankiniais sriegikliais, kai sriegikliai tepami skystaisiais kristalais ir konsistentiniu tepalu. Paviršiaus šiurkštumo tyrimai buvo atlikti tekinant 45 plieninį strypą: pastūma – 0,1 mm/aps., pjovimo greitis buvo keičiamas nuo 85 iki 267 m/min, o cholesterolio stearato kristalų koncentracija emulsijoje – nuo 0,1 iki 0,5 %. Eksperimentas buvo atliekamas pagal dviejų veiksnių ortogonalinį eksperimento planą. Rezultatai pateikti kaip tekinto paviršiaus šiurkštumo parametro Ra priklausomybė nuo pjovimo greičio ir cholesterolio stearato koncentracijos TAS. Peilio užpakalinio paviršiaus nudilimas buvo nustatomas esant tokiems režimams: pjovimo greitis 160 m/min, pastūma 0,1 mm/sūk., aušinimas – mineralinė emulsija BLASOCUT ir ta pati emulsija su 0,1% cholesterolio stearato. Rezultatai pateikti kaip dilimo priklausomybės nuo įrankio kelio grafikai. Nustatyta, kad skystųjų kristalų priedai pagerina įrankio patvarumą ir sumažina įrankio dilimą. Taip pat nustatyta, kad sriegiklio pasipriešinimo momentas mažėja iki 1,1 karto, tepant jį skystaisiais kristalais, lyginant su tepimu konsistentiniu tepalu. Darbą sudaro keturios dalys: įvadas, literatūros analizė, eksperimentiniai tyrimai, išvados. Darbo... [toliau žr. visą tekstą] / The influence of the liquid crystals (cholesteryl stearate) additives on technological properties of the cutting fluid is investigated in the master‘s thesis. Influence of the presence of the liquid crystals in cutting fluid on wear of the carbide lathe tool and roughness of the turned surface is established. Also changes in the cutting torque of the hand tap in the tapping operation were obtained when tap were lubricated with grease and liquid crystals. Research of the surface roughness was done at the following conditions: tool feedrate – 0.1 mm/rev., cutting speed was varied from 85 to 267 m/min and concentration of the liquid crystals was varied from 0.1 to 0.5%. Experimental research was performed by means of two factors second order orthogonal design. The results presented as graphs of dependence of average roughness of turned surface on cutting speed and concentration of the liquid crystals in the coolant. The wear of carbide tool relief face was established under following conditions: cutting speed 160 m/min, feedrate – 0.1 mm/rev., cutting fluid – mineral coolant BLASOCUT with 0.1% and without liquid crystals additives. The results are presented as graphs of dependence of tool wear on the length of tool path. It is established that liquid crystals additive reduces tool wear and increase tool life. It is also established, that cutting torque of the hand tap reduces about 1.5 times when it is lubricated with liquid crystals, as compared with lubrication with... [to full text]

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