Used as intermediate screw transmission components are collectively referred to as the clamping screw clamping body organs. Because of its simple structure reliable clamping common good and as a result of the small helix angle spiral of self-locking clamping body good clamping force and the clamping itinerary are larger fixture on manual with the most a clamping body. 1. Simple screw clamp body The simplest spiral as a result of the direct use of clamping bodies pressed workpiece screw head so easy to damage the surface of the work piece under pressure or driven rotating work piece. So often in the head with swinging Press. Press with the work piece as a result of friction between the Press and the torque is greater than the friction between the screw torque screw together with the Press will not rotate. Clamping action slow time-consuming loading and unloading the work piece is a single spiral Another drawback of the Clamp. To overcome this shortcoming the rapid clamping bodies can be. 2. Clamp screw plate Institutions in the clamping the use of spiral plate is very common common structure of the spiral structure of a typical plate size has been standardized the designer can refer to the relevant national standards and fixture design manual design. (C) Eccentric Clamp With eccentric pieces, directly or indirectly, the work piece clamping body, known as the eccentric clamping body. There are two types of eccentric pieces, that is, and the curveof eccentricity eccentric circle, which, due to a round eccentric structure is simple and easy to manufacture and is widely used. Eccentric clamping processing is easy to operate, rapid clamp, the disadvantage of clamping force and clamping trip are small. Not generally used in cutting force, vibration small there is no centrifugal force of the impact of the processing. 1. Round the working principle of eccentric 9
2. Eccentric clamping round trip and paragraph 3. Eccentric self-locking condition of αmax≤Φ1+Φ2
Was derived: f1 ≥2e / D When f =0.1 hours, e / D≥ 20, when f =0.15 pm, e / D ≥14 Fourth institutions centering clamping When the work piece is processed by the central element of surface (axis, the center plane, etc.) for the base process in order to enable the base to reduce the positioning error of coincidence to be used centering clamping body. Centering centering clamping body and clamping the two functions such as horizontal self-centering three-jaw lathe chuck is a classic example of the most commonly used. Centering centering clamping the role of institutions according to their principle, there are two types, one is relying on the transmission mechanism so that mobile speed centering clamping device in order to achieve centering clamping, such as spiral leveraged institutions such as wedge; the other is the use of thin-walled elastic element force even after the elastic deformation (contraction or expansion), to achieve centering clamping, such as a spring clip drum, diaphragm chuck, bellows units, such as liquid plastic. 1. Centering clamping body spiral Rotary screw thread at both ends to the contrary, the same pitch. When it spins, the two V-shaped gag against the constant movement in order to achieve the centering of the work piece clamping or release. V-shaped work pieces of different shapes can shut up the replacement. Centering clamping bodies such features are: simple structure the work trip and general good but the centering accuracy is not high mainly suitable for rough or semi-finished tour of the needs of large and less demanding precision centering occasions.
2. Leveraged institutions centering clamping Three-jaw self-centering leveraged trading cards, sleeve for axial movement the 10
circle are three fabric hook lever will rotate around the axis, the three struck the slider along the radial movement of the cards in order to promote its claws the work piece centering and clamping or release. This centering clamping rigid body, and move fast, by force multiplier, and the worktrip is also characterized by relatively large, but its relatively low precision centering. Generally about 0.1mm it is mainly used for rough work. Since the body can not self-locking lever, so that organizations rely on self-locking air pressure or other agencies.
3. Centering clamping wedge bodies Wedge mobile folder automatically centering body claw when the work piece surface within the hole and left the position in the fixture after the six-cylinder through the rod so that the left claw clip due to the role of ontology on the slope while the left claw folder to the opened outside the bulge will be centering the workpiece clamping the other hand claw shifted to right folder in the role of spring circle card folder under claw to release the work piece. Centering clamping bodies such compact structure usually ranging from precision centering 0.02mm~ 0.07mm compared with the hole for the workpiece surface for positioning the base of the semi-finishing processes. 4. Clip-on spring-centering clamping cylinder body This centering clamping sleeve body type commonly used in the installation of the work piece. Elastic centering clamping simple structure, small size, easy to operate quickly, so a wide range of applications. Centering accuracy of its stability in between0.04mm~ 0.010mm. In addition to the above described centering clamping bodies, are commonly used diaphragm chuck body, corrugated centering clamping sets of institutions, as well as fluid bodies such as plastic clamping. Machining fixture is an indispensable component in the machine tool technology to high-speed, high efficiency, precision, complex, intelligent, environmentally-friendly direction, driven by technology is moving fixture high-precision, high-performance, modular, mix, general economic direction. 11
First, high-precision Machining with improved accuracy, in order to reduce the positioning error and improve machining accuracy of the fixture manufacturing precision demanding high-precision positioning jig Distance accuracy up to ± 5μm the bearing surface of the vertical fixture achieve 0.01mm / 300mm up to parallelism0.01mm/500mm. Switzerland duplication EROWA Flexible fixture positioning accuracy of up to 2 ~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, double-sided, four and more than clamping fixture of more and more products. Work piece in order to reduce the installation time, all kinds of auto-centering 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 company's ball lock clamping system,1 minutes, will be able to locate and lock fixture in the machine tool table, the ball lock clamping system of flexible production line for the replacement of fixtures, played reduce downtime and increase the role of productivity. Third, modules Modular components of modular fixture is the basis of the realization of portfolio. Take advantage of the modular design of serialization, standardization fixture elements, quickly assembled into a variety of fixtures, has become a fixture technology development basis points.Save labor, time, materials, energy-saving, being reflected in a variety of advanced fixture system innovation. The modular design laid the foundation for the the fixture computer-aided design and assembly. Application of CAD technology to create a component library the typical fixture library, standard and user archive fixture optimization design, assembly fixtures for users dimensional solid. Cutting process simulation tool, both to provide users with the correct fixtures and components supporting the program, but also the accumulation of experience, understand the market demand, and continue to improve and perfect the fixture system. Fourth, GM Economic fixture versatility direct impact on the economy. Modules, modular fixture system, a one-time investment is relatively large, the only fixture system reconfigurable and scalability features a wide range of applications, common good, fixture 12
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