Machine Tool Clamping Assembly With Rocker Force Equalization
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Solution Overview
Problem
Traditional clamping apparatuses in machine tools face challenges in accurately immobilizing workpieces, especially with lightweight materials like aluminum, due to uneven force distribution and potential deformation, leading to machining errors and equipment damage in high-speed production environments.
Innovation Solution
The apparatus features a basic frame with two clamping assemblies and a fluid actuator system, including a rocker element and curved thrust surface, allowing for precise and balanced clamping force distribution, adapting to workpiece shapes and sizes through a sliding mechanism with pressurized fluid actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single hydraulic/pneumatic cylinder drives both clamping brackets through a rigid drive assembly, then the structure is simple and compact, but the clamping force is unevenly distributed when brackets contact the workpiece at different times
Solution Approach 1:
The patent divides the clamping system into two independent clamping assemblies, each with its own hydraulic/pneumatic cylinder and drive mechanism. This segmentation allows each bracket to be controlled independently, ensuring that clamping force is applied evenly to both brackets regardless of when they contact the workpiece, thereby resolving the uneven force distribution problem while maintaining structural simplicity
Solution Approach 2:
The patent introduces a drive assembly with a rocker element and curved thrust surface that acts as an intermediary between the single cylinder and the two brackets. This intermediary mechanism converts the linear motion of the single cylinder into coordinated motion of both brackets, ensuring simultaneous and synchronous displacement while maintaining structural compactness
2Force
If high clamping forces are exerted on lightweight workpieces like aluminum, then the workpiece is securely immobilized for machining, but the workpiece may deform under the great force
Solution Approach 1:
The patent designs clamping assemblies that apply force at specific localized points on the workpiece rather than distributed force. By concentrating the clamping force at predetermined locations and using localized contact surfaces, the system achieves secure immobilization while minimizing the risk of deformation in lightweight materials like aluminum
Solution Approach 2:
The patent employs movable clamping assemblies that can adapt their position and orientation dynamically. This allows the clamping force to be applied optimally at each contact point, ensuring secure holding while distributing the stress to prevent deformation of the workpiece during machining operations
3Manufacturing precision
If clamping brackets are positioned to contact the workpiece simultaneously, then uniform clamping force is achieved, but precise positioning is difficult due to workpiece dimensional tolerances and shape variations
Solution Approach 1:
The patent employs movable clamping assemblies with degrees of freedom that allow them to adapt dynamically to workpiece variations. The brackets can adjust their positions independently to accommodate dimensional tolerances and shape variations, achieving simultaneous contact and uniform force distribution without requiring complex pre-positioning mechanisms
Solution Approach 2:
The clamping assemblies are designed to self-adjust to the workpiece geometry through their movable components. The system automatically compensates for workpiece variations by allowing the brackets to find their optimal contact positions, eliminating the need for complex external positioning mechanisms while maintaining force uniformity
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
Ensures reliable, precise, and safe immobilization of workpieces, preventing deformation and damage, even under varying conditions, by distributing clamping force evenly and accommodating dimensional tolerances and shape variations.
Implementation Method 1
at least one fluid actuator (5, 6), provided with a fixed portion (5) and with a movable portion (6) sliding along a direction of sliding (A)
Data Source
AI summary
The apparatus (1) for clamping workpieces on machine tools comprises:1 a basic frame (2) attachable to a machine tool (M) for machining a workpiece (P);a first clamping assembly (3) and a second clamping assembly (4) movable between a release position and a clamping position of the workpiece (P);a fluid actuator (5, 6), provided with a fixed portion (5) and with a movable portion (6) connected to a drive assembly (7) associated with the clamping assemblies (3, 4);wherein the drive assembly (7) comprises a rocker element (9) associated in a rotatable manner with the movable portion (6), which comprises at least one curved thrust surface (10) arranged in thrust contact against the rocker element (9), wherein the rocker element (9) is rotatable on the curved thrust surface (10).