How to select the connection automatic assembly manufacturing process

Connect to automatic assembly and assembly manufacturing process

Connect automatically loaded assembly benchmark tolerance grade selection, determine the datum holes or datum axis of tolerance zone, as well as the benchmark of the size of the tolerance zone, and with the choice of actually is to determine the location of the tolerance zone of the benchmark that be not, also is to choose the benchmark a basic deviation of generation.

For interference fit, according to the size of the load, according to the theory of plasticity computing allows the minimum and maximum of greater than surplus, to select the appropriate coordination types, GB/T 5371-2 o04 limit and cooperation for the calculation and selection of interference fit, have made detailed provisions. There is no suitable calculation method for the transition cooperation.

The basic deviation of various codes represents a variety of cooperation under certain conditions, so the choice of cooperation is the question of choosing the basic deviation. There are three methods: calculation method, test method and analogy method.

According to certain theories and formulae, the calculation method can be used to determine the gap or overgain, which can be applied to the design of limit and coordination, which is mainly used in the automation group to cooperate with the installation gap and overfill. For example, for the clearance fit of sliding bearings, it is required to calculate the permissible minimum interstitial rings according to the liquid lubrication theory.

The test method is to determine the gap or overfill by test or statistical analysis. This method is reasonable and reliable, but the cost is high, so it is only used for the key cooperation of the main products of automation group.

After studying and analyzing the similar machines and parts, we can select the limit and cooperation according to the previous experience, which is the most applied and main method. Installed in the practical work of automation group, is the most widely used analogy method, the reference to the existing machines or similar structure, it has been verified by practice, and the design of parts, in comparison with the using conditions of the revised, determine to cooperate.