機(jī)加工英文加中文化對(duì)照(已改無錯(cuò)字)
2022-09-20 04:40:19 本頁面
【正文】 an provide surface finish to without extreme cost．(3)The grinding operation can assure dimensions in a relatively short time，since machines are built to provide motions in increments of ten—thousandths of all inch，instead of thousandths as is mon in other machines．(4)Extremely small and thin parts can be finished by this method，since light pressure is used and the tendency for the part to deflect away from the cutter is minimized．On a cylindrical grinding machine the depth of cut is controlled by moving the wheel head，which includes both the wheel and its drive motor．Coolants are provided to reduce heat distortion and to remove chips and abrasive dust．Material removal from ductile materials can be acplished by using a tool which is harder than the workpiece．However during World War II the widespread use of materials which were as hard or harder than cutting tools created a demand for new material—removal methods．Since then a number of processes have been developed which Can effectively remove excess material in a precise and repeatable fashion．There are two types of processes．The first type is based on electrical phenomena and is used primarily for hard materials；the second depends upon chemical dissolution．Electricdischarge machining is a process in which an electrical potential is impressed between the workpiece and the tool，and the current，emanating from a point source on the workpiece。flows to the tool in the form of a spark．The forces that acplish the metal removal are within the work piece proper and，as a result，it is not necessary to construct the unit to withstand the heavy pressures and loads prevalent with conventional machining methods．譯文機(jī)械加工車削 普通車床普通車床作為最早的金屬切削機(jī)床中的一種，目前仍然有許多有用的和為人們所需要的特性。現(xiàn)在，這些機(jī)床主要用在規(guī)模較小的工廠中，進(jìn)行小批量的生產(chǎn)，而不是進(jìn)行大批量的生產(chǎn)。 普通車床的加工偏差主要取決于操作者的技術(shù)熟練程度。設(shè)計(jì)工程師應(yīng)該認(rèn)真地確定由熟練工人在普通車床上加工的試驗(yàn)零件的公差。在把試驗(yàn)零件重新設(shè)計(jì)為生產(chǎn)零件時(shí)，應(yīng)該選用經(jīng)濟(jì)的公差。 在現(xiàn)代的生產(chǎn)車間中，普通車床已經(jīng)被種類繁多的自動(dòng)車床所取代，諸如轉(zhuǎn)塔車床、自動(dòng)螺絲車床和自動(dòng)仿形車床。轉(zhuǎn)塔車床對(duì)生產(chǎn)加工設(shè)備來說，目前比過去更著重評(píng)價(jià)其是否具有精確的和快速的重復(fù)加工能力。應(yīng)用這個(gè)標(biāo)準(zhǔn)來評(píng)價(jià)具體的加工方法，轉(zhuǎn)
電大資料相關(guān)推薦
鄂ICP備17016276號(hào)-1