Due to the research and development of production-oriented production characteristics, most of the product's machining production tasks have the characteristics of small batch, short cycle and high precision. How to ensure the machining accuracy of the workpiece, improve the processing efficiency, and take into account the requirements of product quality and production schedule, is the core task of the machine production. At the same time, due to the structural characteristics of our parts, the milling process occupies an important part, which has a great impact on the production quality and progress of the parts. Therefore, the design of the milling fixture is very high.
A group fixture is a fixture designed and manufactured for one (or several) processes of a group (or groups) of similar parts. The application of group fixtures can expand the scope of use of machine tools, improve production efficiency and processing quality of parts, and also reduce labor intensity, shorten production preparation cycle and increase labor productivity.
For the processing characteristics of our parts, some structural parts are more suitable for the application of group technology design fixtures, to name a few. I hope that by summarizing the design experience of the group fixtures, I will make some discussions in this area and learn from each other and exchange with my peers.
1. Tooling design of beam structure parts
A small batch of products in our company has a set of two beam structure parts (see Figure 1), which are key parts that connect the product core and peripheral components. Due to the installation of the docking dimensions, the accuracy requirements are high. Its shape includes bevel angles and multiple angled bosses (consistent angles), as well as threaded coupling holes in this angular direction and both sides, resulting in a cumbersome milling process and a lack of uniform positioning reference between the various steps, milling The labor of processing is very strong and difficult. Its characteristic is that the mirror size is symmetrical outside the two parts, but the three mounting holes have different hole pitch sizes, which creates conditions for the application of the group fixture.
A set of tooling is designed for the structural size characteristics of the beam structure parts, including the following parts (see Figure 2). The working principle of this tooling is as follows:
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