Multi-Cam Press Ram Drive to Suppress Inclination
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Solution Overview
Problem
Conventional press machines face challenges in achieving high processing accuracy due to ram inclination caused by varying processing reaction forces during press working.
Innovation Solution
A press machine design featuring a shaft with three or more integrally rotatable ram driving cams, supported at both ends and an intermediate portion, which applies both pushing and pulling forces to the ram, along with a transfer device for simultaneous workpiece processing across multiple stages, and an auxiliary cam system for independent punch operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cam is used to drive the ram, then the device complexity is reduced, but the processing accuracy deteriorates due to ram inclination caused by varying processing reaction forces
Solution Approach 1:
The single cam mechanism is segmented into three or more separate cams (first cam, second cam, third cam) that independently drive the ram at different positions. Each cam applies force at a specific location, distributing the processing reaction forces and preventing ram inclination, thereby maintaining processing accuracy without excessive complexity.
Solution Approach 2:
Different cams are positioned at different locations along the ram (first cam at upstream side, second cam at intermediate position, third cam at downstream side). Each cam provides localized force application tailored to the specific processing reaction forces at that position, ensuring uniform ram movement and high processing accuracy.
2Device complexity
If the shaft is supported only at both ends, then the assembly is simplified, but the shaft bending increases under varying loads affecting ram stability
Solution Approach 1:
The shaft support structure is segmented from a simple two-point support into a three-point support system, with rotation support portions at both ends and an intermediate support portion in the middle. This segmentation provides better load distribution and shaft stability under varying processing forces.
Solution Approach 2:
The support structure transitions from a one-dimensional line support to a two-dimensional plane support by adding the intermediate support portion. This creates a triangular support configuration that provides superior structural stability and reduces shaft bending compared to simple end supports.
3Manufacturing precision
If multiple cams are added to improve processing accuracy, then the manufacturing precision is improved, but the device complexity and collision risks increase
Solution Approach 1:
Multiple cams are merged onto a single common shaft that rotates integrally. This combines the complexity of multiple independent cam mechanisms into one unified structure, reducing the number of separate components while maintaining the benefits of multiple force application points for high processing accuracy.
Solution Approach 2:
The common shaft serves multiple functions: it supports all three cams, provides rotational motion to all cams simultaneously, and acts as a structural backbone for the entire mechanism. This multi-functionality reduces overall device complexity while enabling precise control through multiple cams.
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 design effectively suppresses ram inclination, enhances processing accuracy, and facilitates easy assembly by minimizing shaft bending and collision risks, thereby improving overall operational precision.
Implementation Method 1
a cam mechanism that transforms a rotational movement of the cam shaft (40) into a reciprocating movement of the ram (20)
Data Source
AI summary
A press machine includes: a ram, a shaft, and three or more ram driving cams, for the one ram, configured to push down the ram toward a bottom dead center, the plurality of ram driving cams being integrally rotatable with the common shaft. Both end portions of the shaft are rotatably supported by a pair of rotation support portions fitted to the both end portions between which all of the plurality of ram driving cams are disposed, and an intermediate portion of the shaft disposed between the ram driving cams is rotatably supported by a support groove opened downward. The plurality of ram driving cams includes at least two lifting and lowering cams configured to apply both a pushing down force and a pushing up force to the ram, and at least one lowering cam configured to apply only the pushing down force to the ram.