Tooling fixture is mainly used for product positioning play, fastening and clamping action in the second process, the design and selection of tooling fixture is very important; secondary processing products generally do not require complex fixtures, only requires simple positioning, clamping it, the principle of its design combined with the characteristics of the product form and function, design and easy to use features suitable mechanical structure. The general structure of a single fixture design, gives the impression that the structure is not very complicated, especially now that the popularity of the hydraulic clamp so that the original mechanical structure greatly simplified, but if the design process is not bound to be carefully considered unnecessary trouble.
    1, ignoring the workpiece blank margin. In accordance with standard machining tooling design drawings arranged fixture card support and pressure point, resulting in the blank size is too large, resulting in interference. So before the design must be prepared blank map. Leave enough space.
    2, ignoring the chip patency tooling fixture. Design due to the limited space of the machining
Sex, tooling fixtures are often designed more compact space, then they tend to be ignored in the process of iron produced in the tooling fixture at accumulating dead, including effluent poor chip solution, after processing to bring a lot of trouble . Therefore, the actual beginning of the process should take into account the problems, after all tooling fixture is to improve efficiency and easy operation based.
    3, ignoring the overall fixture openness. Ignore openness, resulting in the operator chucking difficult, time consuming, design taboo.
    4, ignoring tooling fixture design basic theoretical principles. Each tooling fixture to go through numerous clamping action is released, it may begin to achieve customer requirements, but the tooling fixture should have it maintain accuracy, so do not contrary to the principles of design some things. Even if the moment can be lucky, there will be no long-term sustainability. A good design should play through the temper of the time.
    5, ignoring oil cleanliness. Tooling fixture of oil pollution, pollution of oil pressure, hydraulic components will damage soon, causing action failure. The consequences could be serious.
    6, ignoring the positioning element can be replaced. Positioning element badly worn, it should be considered more.