【正文】 centrifugal force, inertia force, such as the role of, in order to ensure that these external force, the workpiece can remain in the fixture by the positioning of the processing to determine the location of ponents, and should be no vibration or displacement, fixture structure should be set up reliable work piece clamping device folder will be in prison. First, the position of clamping devices Many different types of clamping devices, but their structures are posed of two parts. 1. Power plant The source of clamping force, one human。 5μm the bearing surface of the vertical fixture achieve / 300mm up to ~5μm. Precision machine tool fixture to the micron level has been raised the worlds leading manufacturer of fixture is precision machinery manufacturing enterprises. It is true that, in order to meet the needs of different industries and economy, folders with different models, as well as the different grades for the accuracy of the standard options. Second, efficient tool To improve production efficiency, doublesided, four and more than clamping fixture of more and more products. Work piece in order to reduce the installation time, all kinds of autocentering clamping, precision flat clamp, clamping levers, cam clamp, such as pneumatic and hydraulic clamping, rapid clamping new features constantly. New type of electronically controlled permanent magnet fixture, step up and release the work piece only 1~2 seconds, simplifying the fixture structure for the machine to carry out stage, faceted and processing to create the condition. American JERGENS the pany39。~ 8 176。省工、省時、節(jié)材、節(jié)能，體現(xiàn)在各種先進夾具系統(tǒng)的創(chuàng)新之中。機床夾具的精度已提高到微米級，世界知名的夾具制造公司都是精密機械制造企業(yè)。 這種定心夾緊機構的結構緊湊，定心精度一般可達 ，比較適用于工件內(nèi)孔作定位基面的半精加工工序。當其旋轉時，使兩個 V 形鉗口作對向等速移動，從而實現(xiàn)對工件的定心夾緊或松開。 （三）偏心夾緊機構 用偏心件直接或間接夾緊工件的機構，稱為偏心夾緊機構。 （二）螺旋夾緊機構 采用螺桿作中間傳力元件的夾緊機構統(tǒng)稱為螺旋夾緊機構。夾緊裝置的操作應當方便、安全、省力。 3）夾緊元件。 1．動力裝置 夾緊力的來源，一是人力；二是某種裝置所產(chǎn)生的力。 一、夾緊裝置的組成 夾緊裝置的種類很多，但其結構均由兩部分組成。如鉸鏈、杠桿等。 3．使用性好。 斜楔夾緊具有結構簡單，增力比大，自鎖性能好等特點，因此獲得廣泛應用。 2．螺旋壓板夾緊機構 在夾緊機構中，螺旋壓板的使用非常普遍，常見的螺旋壓板典型結構其結構尺寸均已標準化，設計者可參考有關國家標準和夾具設計手冊進行設計。 1．螺旋式定心夾緊機構 螺桿兩端的螺紋旋向相反，螺距相同。 3．楔式定心夾緊機構 機動的楔式夾爪自動定心機構中，當工件以內(nèi)孔及左端面在夾具上定位后，汽缸通過拉桿使六個夾爪左移， 由于本體上斜面的作用，夾爪左移的同時向外脹開，將工件定心夾緊；反之，夾爪右移時，在彈簧卡圈的作用下使夾爪收攏，將工件松開。瑞士EROWA柔性夾具的重復定位精度高達2~5微米。利用模塊化設計的系列化、標準化夾具元件，快速組裝成各種夾具，已成為夾具技術開發(fā)的基點。 second is generated by a power device can generate power as the power unit fixture. Commonly used in power plant are: pneumatic devices hydraulic devices electrical devices electromagnetic devices gas liquid interaction devices and vacuum devices. Fixture as a result of manual clamping force from the human so it does not power plants. 2. Clamping part Receive and impart into the original clamping force to clamp the task force and part of the implementation of the general position of the following agencies: 1) to accept the original force of bodies. Such as handles nuts and used to connect the institutions such as cylinder piston rod. 2) Force the middle of delivery. Such as hinges levers and so on. 3) Clamping ponents. Such as plate such as screws. Force delivery