【正文】 Production technical preparation work is easy, easy to transform.Three, literature review, two fixture design (part)Boring clamp, also known as boring and die it is mainly used for processing box, stents, such as the workpiece on the single hole or holes. Boring and die not only widely used in general boring machine can also be used for general lathe and boring machine, milling machine, radial drilling machine, the processing hole or holes with high accuracy requirements. Boring clamp, besides positioning ponents, press agencies and basic parts, such as concrete and guided boring cutter set. But also like drill sets of layout on the drill template, set is in accordance with the processing hole or boring is the coordinates of the location, layout in one or a few dedicated boring position precision and hole geometry precision. Therefore, boring, boring mould bracket and boring bar is boring fixture characteristic ponents. Fixture design, with positioning element to consider options, clamping device and the clamping force and typical fixture to determine the factors such as design principles, I mainly refer to the metal cutting machine tool fixture design handbook machine tool fixture atlas of machine tool fixture design and manufacture the mechanical parts design handbook tolerance and fit mechanical manufacturing technology information and books. A, when the parts processing, one of the important question to consider is how to correct clamping workpiece in the machine or jig. Socalled clamping has two meanings, the locating and clamping, the clamping is called install some books. Li Changnian editor in chief of the machine tool fixture design and manufacturing has the following:1, the determination of locating elementsPositioning refers to determine the workpiece on the machine (table) have the right process or jig, can usually be interpreted as relative to the workpiece cutting tool or grinding tool of a certain position, to ensure the processing precision of dimension, form and position requirements. So reference [4] in the second chapter introduces the monly used positioning method is: (1) the workpiece with planar location with cylindrical holes (2) the workpiece location outside round surface (3) the workpiece positioning (4) the orientation of workpiece with other surface (5) bination (6) side two holes on the surface of the positioning2, clamping device and the determination of clamping forceClamping refers to artifacts should be fixed after positioning, can withstand gravity in the machining process and cutting force, and the operation of the locating position unchanged. By reference [4] in the third chapter are: (1) the determination of clamping device when the clamping device is an important part of the jig.Should be paid attention to when designing clamping device, to meet the following requirements: 1) should be able to keep the workpiece positioning in the process of stepping up the correct position. 2) size appropriate clamping force. Clamping mechanism should ensure workpiece in machining process does not produce looseness or vibrations, and at the same time to avoid undue distortion and surface damage is generated. And the clamping mechanism general selflocking function. 3) clamping device should be easy to operate, safe, energy saving. 4) the plexity of the clamping device and automation should be adapted to production batch and production way. Should strive to simple, pact structure and design, and try to adopt standardized ponents. (2) determination of clamping forceClamping force includes three elements: size, direction and functional point.Clamping force in the direction of choice in general should follow the following principles: 1) the role of the clamping force direction should be conducive to the accurate positioning of workpiece, and not damage localization. 2) the clamping force direction as far as possible consistent with the direction of the workpiece stiffness big, to reduce the workpiece clamping deformation. 3) clamping force direction should be the same as that of cutting force, gravity of workpiece, to minimize the required clamping force. The point of clamping force options: 1) clamping force point should be on supporting ponents or located in the support element formed by the supporting surface, to ensure the positioning of workpiece has been unchanged. 2) clamping force point should be in the workpiece rigid good parts, in order to reduce clamping deformation of workpiece. 3) clamping force point should be close to processing surface, to reduce the workpiece caused by cutting force turning torque. Clamping force calculations: estimate the clamping force of the general approach is to separate the workpiece as a body, forces, and analyze the effect on the parts again According to the system of force equilibrium conditions to determine the minimum clamping force required to keep the balance of artifacts, the final will be the minimum clamping force multiplied by an appropriate factor of safety, that is to get the required clamping force.Second, the structure of fixture types Boring machine fixture according to its structural characteristics, the use of machine tool and boring position is different, have the following classification method.1. According to the used machine tools category, can be divided into universal boring clamp, multiaxis boring modular machine tool clamp, precision boring machine, and the mon boring machine tool fixture.2. According to clamp the structure characteristics of points, can be divided into vertical and horizontal boring machine jig boring machine fixture, etc.3. According to the boring and sets the location of the distribution, can be divided into the single bearing before guided boring clamp, namely boring set is to be processing the front of the hole。 Process, process long, each working procedure the processing content co