【正文】 體積功率消耗曾家的這些因素就將使切削溫度升高。然而切削速度的增加，傳導(dǎo)到工件上的熱 的數(shù)量減少而這又增加主變形區(qū)中的切屑溫升。這表明如何人從切削參數(shù)來確定切削溫度那是很合適的。當(dāng)要加工廣泛的工件材料時(shí)，Trent 已經(jīng)論述過測定高速鋼刀具的切削溫度及溫度分布的方法。后刀面磨損既發(fā)生在主刀刃上也發(fā)生副刀刃上。 由于刀具表面上的應(yīng)力分布不均勻，切屑和前刀面之間滑動(dòng)接觸區(qū)應(yīng)力，在滑動(dòng)接觸區(qū)的起始處最大，而在接觸區(qū)的尾部為零，這樣磨蝕性磨損在這個(gè)區(qū)域發(fā)生了。在許多情況中和對(duì)于實(shí)際的切削狀況而言，前刀面磨損比起后刀面磨損要輕，因此后刀面磨損更普遍地作為刀具失效的尺度標(biāo)志。這是因?yàn)榫植啃?yīng)，這像未加工表面上的已硬化層，這效應(yīng)是由前面的切削引起的工件硬化造成的。 如果任何進(jìn)行性形式 的磨損任由繼續(xù)發(fā)展，最終磨損速率明顯地增加而刀具將會(huì)有摧毀性失效破壞，即刀 具將不能再用作切削，造成工件報(bào)廢，那算是好的，嚴(yán)重的可造成機(jī)床破壞。 8 五 自動(dòng)夾具設(shè)計(jì) 用做裝配設(shè)備的傳統(tǒng)同步夾 具把零件移動(dòng)到夾具中心上，以確保零件從傳送機(jī)上或從設(shè)備盤上取出后置于已定位置上。因?yàn)閵A具作用力和同步化裝置是各自獨(dú)立的，該同步裝置可以用精密的滑移裝置來替換而不影響夾具作用力。這種情形正迫使許多公司更多地致力于廣泛的合理化改革和前面提到過情況那樣裝配自動(dòng)化。柔性夾具是以它們對(duì)不同工件的高適應(yīng)性和以少更換低費(fèi)用為特征的。依據(jù)這樣的程序，夾具的輪廓結(jié)構(gòu)和裝合的規(guī)劃和記錄過程可以進(jìn)行自動(dòng)化控制。簡言之，可成功地達(dá)到顯著提高夾具生產(chǎn)效率和效益。Trent which also yields detailed information on temperature distributions in highspeedsteel tools which relates microstructural changes to thermal history. Trent has described measurements of cutting temperatures and temperature distributions for highspeedsteel tools when machining a wide range of workpiece materials. This technique has been further developed by using scanning electron microscopy to study finescale microstructural changes srising from over tempering of the tempered martensitic matrix of various highspeedsteels. This technique has also been used to study temperature distributions in both highspeedsteel single point turning tools and twist drills. V. Automatic Fixture Design Assembly equipment used in the traditional synchronous fixture put parts of the fixture mobile center, to ensure that ponents from transmission from the plane or equipment plate placed after removal has been scheduled for position. However, in certain applications, mobile mandatory parts of the center line, it may cause parts or equipment damage. When parts vulnerability and may lead to a small vibration abandoned, or when their location is by machine spindle or specific to die, Tolerance again or when the request is a sophisticated, it would rather let the fixture to adapt to the location of parts, and not the contrary. For these tasks, Elyria, Ohio, the pany has developed Zaytran a general nonfunctional data synchronization West category FLEXIBILITY fixture. Fixture because of the interaction and synchronization devices is independent, The synchronous device can use sophisticated equipment to replace the slip without affecting the fixture force. Fixture specification range from inches itinerary, 5 pounds clamping force of the sixinch trip, 400inch clamping force. The characteristics of modern production is being smaller and smaller quantities and product specifications biggest changes. Therefore, in the final stages of production, assembly of production, quantity and product design changes appear to be particularly vulnerable. This situation is forcing many panies to make greater efforts to rationalize the extensive reform and the previously mentioned case of assembly automation. Despite flexible fixture behind the rapid development of flexible transport and handling devices, such as backward in the development of industrial robots, it is still expected to increase the flexibility fixture. In fact the important fixture devices the production of the devices to strengthen investment on the fixture so that more flexibility in economic support holders. According to their flexibility and fixture can be divided into : special fixture, the fixture binations, the standard fixture, high flexible fixture. Flexible fixture on different parts of their high adaptability and the few lowcost replacement for the characteristic. Forms can transform the structure of the flexible fixture can be installed with the change of structure ponents (such as needle cheek plate, Multichip ponents and flake cheek plate), a nonstandard work piece gripper or clamping elements (for example : mencement standard with a clamping fixture and mobile ponents fixture supporting documents), or with ceramic or hardening of the intermediary substances (such as : Mobile particle bed fixture and heat 13 fixture tight fixture). To production, the parts were secured fixture, the need to generate clamping function, its fixture with a few unrelated to the sexual submissive steps: According to the processing was part of that foundation and working characteristics to determine the work piece fixture in the required position, then need to select some stability flat bination, These constitute a stable plane was fixed in the work piece fixture set position on the clampprofile structure, all balanced and torque, it has also ensured that the work features close to the work piece. Finally, it must be calculated and adjusted, assembly or disassembly be standard fixture ponents required for the position, so that the work piece firmly by clamping fixture in China. In accordance with this procedure, the outline fixture structure and equipped with the planning and recording process can be automated control. Structural modeli