Press Transport Motion Synchronization for Variable-Speed Servo Strokes
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Solution Overview
Problem
Existing press devices face challenges in setting transport motions when press motions are changed, leading to unstable transport operations due to sudden changes in operation speed, particularly in servo presses where press speed is varied during a stroke.
Innovation Solution
A press device with a control unit that sets a reference transport motion and synchronous timing based on a predetermined reference press motion, allowing for easy adjustment of actual transport motion to match the changed press motion by extending specific parts of the operation time and maintaining the same operation pattern from the synchronous timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the press speed is changed during one stroke in a servo press, then the press motion can be optimized for different stages of the stroke, but the transport operation becomes unstable due to sudden changes in operation speed
Solution Approach 1:
The patent introduces a virtual cam as an intermediary element that rotates at constant speed to mediate between the variable-speed press slide and the transport device. The virtual cam converts the variable press speed into uniform rotational motion, which then drives the transport device at constant speed, eliminating instability caused by press speed variations.
Solution Approach 2:
The patent replaces the direct mechanical linkage between the press slide and transport device with a control system that uses virtual cam rotation as an intermediate control mechanism. This substitution allows the transport speed to be decoupled from press speed variations, maintaining transport stability while allowing press speed optimization.
2Reliability
If the press motion and TF motion are associated using a virtual cam with constant speed, then the transport stability is improved, but the complexity of motion setting increases when press motion changes
Solution Approach 1:
The patent changes the control parameter from direct press motion linkage to virtual cam rotation angle. By using the virtual cam's constant rotational speed as the control parameter, the system simplifies motion setting because the transport motion can be defined as a function of cam rotation rather than requiring complex synchronization with variable press speed profiles.
Solution Approach 2:
The virtual cam serves multiple functions: it acts as a constant-speed driver for the transport device, a timing reference for synchronization, and a parameter converter that translates variable press motion into uniform rotational motion. This multi-functionality reduces the need for separate control mechanisms.
Data Source
AI summary
There is provided a press device including a reference operation setting unit that sets a reference transport motion of a transport device which corresponds to a predetermined reference press motion of the slide, a timing setting unit that sets a synchronous timing of the reference transport motion for the reference press motion, a press operation setting unit that sets a press motion of an actual operation by extending a time of a part of the reference press motion, and a transport operation setting unit that sets a transport motion of the actual operation which corresponds to the press motion by matching synchronous timings with each other between the press motion and the reference transport motion for the reference press motion, and by setting an operation pattern from the synchronous timing to be the same as that of the reference transport motion.