The main group of tooling is made up of fixtures of mechanical assembly production. Devices in a mechanical engineering are called auxiliary devices to the process equipment used when performing operations of machining, assembly and control.
The use of devices allows you to: eliminate the marking of blanks before processing, improve processing accuracy, reduce production costs, facilitate working conditions and ensure their safety, expand the technological capabilities of equipment, organize machine maintenance, apply technically sound standards, time, reduce the number of workers required for production .
Frequent change of production facilities, associated with the increase in the pace of the technological process in the era of the scientific and technological revolution, requires technological science and practice to create structures and systems of adaptations, methods for calculating them, designing and manufacturing, ensuring a steady reduction in production preparation time. In mass production, it is necessary to use specialized quickly adjusted and reversible systems of devices. In small-scale and single productions, the system of universal assemblies is increasingly used.
A number of fundamentally new requirements for fixtures are determined by the expansion of the park of CNC machines, the readjustment of which for processing a new workpiece comes down to replacing the program and replacing or changing over the fixture for basing and securing the workpiece.
The study of the laws of the impact of devices on the accuracy and performance of operations performed will allow you to design devices that intensify production and increase its accuracy. The ongoing work on the unification and standardization of the elements of devices created the basis for computer-aided design of devices using electronic computing equipment and automatic machines for graphic representation. This leads to the acceleration of technological preparation of production.