Press Machine Slide Vibration Control via Hydraulic Sub-Slide
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Solution Overview
Problem
Existing press machines face challenges in applying large compression forces while imparting smooth vibration only in the rectilinear advancing direction, leading to reduced formability and increased friction between the mold and material, due to limitations in vibration frequency and amplitude control, and mechanical clearances.
Innovation Solution
A press machine design featuring a main slide and a sub-slide with hydraulic pressure transmission, where the sub-slide is driven to reciprocate relative to the main slide, allowing for controlled vibration frequency and amplitude within specific ranges to reduce inertia and mechanical clearances, thereby improving formability and applying large compression forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If vibration is applied to the slide through mechanical mechanisms (gears, linkages), then the slide can be vibrated, but the vibration frequency is difficult to increase and the waveform becomes irregular due to backlash and clearances
Solution Approach 1:
The patent replaces the mechanical vibration transmission system (gears, linkages) with a direct-drive system where the servomotor couples the crankshaft directly to the slide without intermediate mechanical transmission elements. This eliminates backlash and clearances, enabling high-frequency regular vibration waveforms.
Solution Approach 2:
The patent removes the intermediate mechanical transmission components (gears, linkages, cam mechanisms) from the vibration transmission path, extracting only the essential function of converting rotational motion to linear reciprocating motion through direct crankshaft-slide coupling.
2Speed
If a linear servomotor is used to directly vibrate the slide, then high-frequency vibration can be achieved, but the output magnitude is limited to less than 100 kN force and 20 kW power
Solution Approach 1:
The patent segments the drive system into two functional parts: a servomotor for high-frequency vibration control and a crank mechanism for force amplification. The servomotor drives the crankshaft, which converts rotational motion to linear reciprocating motion with mechanical advantage, achieving both high frequency and large force.
Solution Approach 2:
The patent changes the operational parameters of the crank mechanism by operating it at high speeds (high rotational frequency) rather than traditional slow speeds, enabling the system to deliver both high-frequency vibration and large compression forces simultaneously.
3Speed
If vibration is applied through screw-nut mechanism, then the slide can be vibrated, but the slide also vibrates in rotational direction due to gib clearance, which hinders forming
Solution Approach 1:
The patent eliminates the screw-nut mechanism and replaces it with direct crankshaft-slide coupling. This substitution removes the source of rotational vibration (gib clearance in screw-nut) while maintaining the ability to generate high-frequency linear vibration through the crank mechanism.
4Manufacturing precision
If ultrasonic vibrator is connected to the mold, then press-forming can be performed, but each mold needs vibration mechanism which increases price
Solution Approach 1:
The patent merges the vibration generation function into a single centralized system (crankshaft-driven slide) rather than distributing vibration mechanisms to each mold. The single slide vibration mechanism serves both upper and lower molds, reducing overall system complexity and cost.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables improved formability by reducing friction and preventing material fractures, with optimal vibration conditions of 9 Hz to 33.3 Hz frequency and 0.05 mm to 0.5 mm amplitude, enhancing the limit drawing ratio and stress relief effects.
Implementation Method 1
a compression force applied to the main slide being transmitted to the sub-slide through hydraulic pressure
Data Source
AI summary
There is provided a press machine which can apply a large compression force to a mold as well as impart smooth vibration only in a rectilinear advancing direction to the mold, and thereby can improve the press-formability. A main slide and a sub-slide constitute a slide and at the same time a cylinder-piston mechanism. During press-forming, a compression force is transmitted to the sub-slide (an upper mold) through hydraulic pressure applied interlockingly with driving of the main slide, and the sub-slide is vibrated with the hydraulic pressure being periodically changed. Favorable press-forming can be performed even under relatively difficult press-forming conditions, by controlling the vibration such that a vibration frequency of the sub-slide (the upper mold) becomes 9 Hz or higher but 33.3 Hz or lower and a vibration amplitude of the sub-slide becomes 0.05 mm or larger but 0.5 mm or smaller.