Striker Hold Mechanism for High-Speed Eccentric Press Working
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Solution Overview
Problem
Press machines face challenges in performing press working efficiently when the eccentric shaft rotates within a rotational angle range of 90° - 180° or 180° - 270°, as the stroke position of the ram is higher near 90°, leading to reduced punching capability and increased difficulty in processing thicker workpieces.
Innovation Solution
A press machine configuration that includes a striker assembly with a sync-motion mechanism and adjustable striker positions, allowing the ram to maintain effective striking force and length across various rotational angles, enabling high-speed working and efficient processing of both thin and thick sheet materials by synchronizing the vertical motion of the striker with the entrance and removal of pressure-receive plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the eccentric shaft rotates within a rotational angle range of 90° - 180° to achieve high-speed working, then the productivity is improved, but the stroke position of the ram becomes higher leading to reduced punching capability
Solution Approach 1:
The striker assembly is divided into multiple independent components including the striker body, pressure-receive plates, and sync-motion mechanism. This segmentation allows each component to perform specific functions independently, enabling the striker to maintain effective striking force at higher stroke positions while still capable of processing thicker workpieces through coordinated action of the segmented components.
Solution Approach 2:
The striker assembly incorporates adjustable striker positions and a sync-motion mechanism that dynamically adapts the striker's vertical motion to synchronize with the entrance and removal of pressure-receive plates. This dynamic adjustment allows the system to optimize striking force and length for different rotational angles and workpiece thicknesses, resolving the contradiction between high-speed working and punching capability.
2Productivity
If the rotational angle range is reduced to achieve high-speed working, then the productivity is improved, but the striking length becomes insufficient for thick sheet materials
Solution Approach 1:
The adjustable striker positions mechanism allows the striker to dynamically change its vertical position and effective striking length. When processing thick sheet materials, the striker can be positioned lower to increase striking length, while maintaining high-speed working capability through the sync-motion mechanism that coordinates the striker's motion with the pressure-receive plates regardless of the rotational angle range.
3Speed
If the ram stroke position is higher near 90° rotational angle, then the high-speed working is enabled, but the difficulty of processing thicker workpieces increases
Solution Approach 1:
The pressure-receive plates act as intermediaries between the striker and the workpiece. These plates can be inserted and removed independently of the striker's position, allowing the system to process thicker workpieces even when the striker operates at higher stroke positions near 90° rotational angle. The sync-motion mechanism coordinates the timing of plate insertion/removal with the striker's motion, enabling high-speed working while maintaining ease of processing for various workpiece thicknesses.
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
Enables high-speed press working with improved striking force and length adjustment, allowing for efficient processing of both thin and thick sheet materials by accommodating different rotational angles, thus overcoming the limitations of traditional press machines.
Implementation Method 1
when an eccentric shaft (a crank shaft) rotates, a ram moves downward from a top dead center toward a bottom dead center and then moves upward from the bottom dead center toward the top dead center
Implementation Method 2
synchronizing the vertical motion of the striker with the entrance and removal of pressure-receive plates
Data Source
Figure 1
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AI summary
In a press machine, a ram (1) is vertically moved by rotations of an eccentric shaft. The press machine includes a striker housing (9) provided beneath the ram (1) and vertically moved together with the ram (1), a striker (3) vertically movable with respect to the striker housing (9), and a hold mechanism (11, 13, 15, 19, 21, 25) for holding the striker (3) at a lift-up position and a lift-down position. According to the press machine, press working can be done surely even when reciprocating rotations of the eccentric shaft are done in a vicinity of a rotational angle 90° (or 270°) of the eccentric shaft.