An intelligent press-fitting system based on high-end manufacturing and process monitoring

Abstract

The invention discloses a smart press-mounting system based on high-end manufacturing and process monitoring. The system includes a displacement sensor, a force sensor, high-performance embedded processor, a main control computer, a human-machine interface, a field bus interface and a data storage unit, wherein the displacement sensor and the force sensor are used for collecting data, the high-performance embedded processor is connected with the displacement sensor and the force sensor, and the human-machine interface, the field bus interface and the data storage unit are connected with the main control computer. According to the system, pull / press signals and displacement-value signals in a press-mounting process can be rapidly and synchronously collected, the pull / press signals and the displacement-value signals respond rapidly, a servo electric cylinder is controlled through a high-speed closed loop, and the accurate press and mounting of the modes of positioning, pressure fixing, pressure limiting and positioning and the like are achieved; meanwhile, the pull / press signals, the displacement-value signals and curve graphs of relations between the pull / press signals and the displacement-value signals can be monitored and analyzed; according to preset constraint conditions, the quality of products is inspected and evaluated in real time in the press-mounting process, defective products can be detected online, and the lean press and mounting are achieved to the maximum degree.

Description

technical field [0001] The invention relates to the field of press-fitting equipment, in particular to an intelligent press-fitting system based on high-end manufacturing and process monitoring. Background technique [0002] Press-fitting is one of the main processes in industrialized manufacturing. It is widely used in various press-fitting, assembly, riveting, etc. in various industries such as automobiles, electronics, medical equipment, motors, home appliances, packaging, etc., such as motor assembly, shafts, bearings, etc. Press-in, transformer molding, etc. High-precision automated press-fitting methods and equipment are an important part of improving industrial automation, manufacturing capabilities, improving process accuracy, and producing high-reliability products. [0003] At present, press-fitting equipment is usually produced by customizing non-standard equipment, and PLC (programmable logic controller) is usually used to control the equipment. However, due to ...

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Problems solved by technology

[0003] At present, press-fitting equipment is usually produced by customizing non-standard equipment, and PLC (programmable logic controller) is usually used to control the equipment. However, due to the limitation of PLC scanning cycle and analog signal sampling frequency, it is difficult to achieve high-precision full-scale Closed-loop control, and when the sampling frequency is lower than 1k, it is impossible to monitor the subtle changes of the force-displacement curve during the press-fitting process

Therefore, in general, non-standard press-fitting equipment either adopts an open-loop rough control method or a semi-closed-loop method, which is difficult to achieve precise press-fitting control and monitoring

Due to the lack of effective monitoring methods, it is difficult to identify defective products and ensure product quality through process monitoring of the process. It is necessary to add random inspection or full inspection procedures after the second process to do post-event inspection and control, but in most cases the post-event inspection is only The detection of appearance indicators, even if it is a full inspection, can only detect some defective products, which wastes a lot of manpower and material resources, and it is difficult to ensure the quality of all products

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