Servo press-fit equipment pressure control method based on input shaping
A technology for input shaping and pressing equipment, applied in the direction of presses, manufacturing tools, etc., can solve the problems of not being able to provide rapid pressure build-up and high-precision pressure control, easy to oscillate, and damage the workpiece, etc., to shorten the pressure Effects of building up time, increasing damping, and improving pressure control accuracy
Active Publication Date: 2019-09-17
BOZHON PRECISION IND TECH CO LTD
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Problems solved by technology
[0006] Servo pressing equipment generally has the characteristics of high rigidity and light damping, and it is prone to oscillation during the fast pressing process, resulting in greater impact and even damage to the workpiece
The control methods proposed in the Chinese patent "a wafer pressure control device, method and system" and "motor control device" cannot effectively solve this problem, and cannot provide rapid pressure build-up in the case of pressure control requiring fast response and high precision pressure control
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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific implementation examples described here are only used to explain the present invention, not to limit the present invention.
[0034] figure 1 It is the schematic diagram of the servo lamination equipment. The servo motor drives the screw to rotate and drives the indenter to move downward, thereby exerting pressure on the workpiece. The pressure on the workpiece is fed back to the servo driver through the pressure sensor. The pressure control deviation can be obtained by comparing the pressure command and the feedback pressure, and then the motor control command is obtained through the pressure closed-loop controller integrated in the servo driver, thereby realizing pressure control.
[0035] The b...
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The invention discloses a servo press-fit equipment pressure control method based on input shaping. The method comprises the following steps that servo press-fit equipment is subjected to system modeling, so that a transfer function of the system is obtained; a pressure head is in contact with a workpiece, and then a certain pre-pressure is applied, a sweeping frequency voltage signal is loaded onto a servo motor, pressure data fed back by a pressure sensor are measured, and a frequency response curve of the system is obtained through the voltage signal and the pressure signal; parameter identification is carried out on the servo press-fit system on the basis of the established transfer function, and a inherent frequency omega d and a damping ratio xi of the system are obtained; then parameters of a ZVD type input shaper are obtained; and the designed input shaper is used in combination to obtain a servo pressure feedback controller. According to the method, a pressure closed-loop controller based on input shaping is additionally arranged outside the current loop of the servo system, so that under the condition that the system rigidity is not reduced, the damping of the system is increased, the feedback control gain is improved, so that the pressure establishing time can be shortened, and meanwhile the pressure control precision is improved.
Description
technical field [0001] The invention relates to a pressure control method of a servo pressing device, in particular to a pressure control method of a servo pressing device based on input shaping. Background technique [0002] With the development trend of thinner and lighter, press-fit assembly technology has been more and more widely used in the assembly process of 3C electronic products, such as the assembly of notebook batteries, keyboards, keyboard shells, microphones and other components. Using the press-fit assembly process, its main mechanism is: first place a pressure-sensitive adhesive between the workpiece and the base, and then drive the screw to rotate through the servo drive, thereby driving the indenter to load a certain pressure on the workpiece and keep it for a certain period of time. Time, so that the workpiece and the base are firmly bonded together. Servo pressing equipment arranges a pressure sensor in the pressure head or the driving mechanism to reali...
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IPC IPC(8): B30B15/14
CPCB30B15/148
Inventor 田立志柳刚孟健王丰林盛
Owner BOZHON PRECISION IND TECH CO LTD