Adaptive Clamping Head for Releasing Machining Deformation
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Solution Overview
Problem
Existing fixtures fail to effectively release machining deformation in parts during machining, affecting the final quality of the parts due to material residual stress and clamping forces.
Innovation Solution
A clamping device comprising a base, an adjustable assembly, and a clamping head with a blind rivet and locking member, where the support cylinder compresses an elastic member to relax the blind rivet, allowing deformation adjustment and re-clamping based on part deformation, enabling repeated deformation release during machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a part is clamped during machining to maintain position stability, then positioning accuracy is improved, but machining deformation occurs due to clamping force and residual stress
Solution Approach 1:
The clamping device employs a dynamic adjustment mechanism where the support cylinder can move vertically to adjust the clamping head's position. This allows the clamping force to be dynamically adjusted or released during machining to accommodate deformation, then re-clamped after deformation release, resolving the contradiction between maintaining positioning accuracy and preventing machining deformation
Solution Approach 2:
The clamping process is divided into periodic cycles: clamping before machining, releasing during machining to allow deformation, and re-clamping after deformation release. This periodic action between clamping and releasing enables the part to be processed while minimizing the harmful effects of continuous clamping force
2Stability of the object's composition
If clamping force is applied to hold the part steady, then positioning stability is improved, but the part deformation increases due to material residual stress and clamping force
Solution Approach 1:
The support cylinder provides dynamic vertical adjustment capability, allowing the clamping head to be moved to different heights. This enables the system to transition from a stable clamped state to a released state where deformation can occur, then return to clamped state after deformation release, resolving the contradiction between positioning stability and preventing shape change
Solution Approach 2:
The clamping force is temporarily discarded (released) during machining to allow the part to deform freely under residual stress, then recovered (re-applied) after deformation release to maintain positioning stability for subsequent machining operations
3Device complexity
If the clamping head is fixed in position, then device structure is simplified, but adaptive adjustment for deformation is not possible
Solution Approach 1:
The support cylinder uses pneumatic or hydraulic principles to provide vertical movement of the clamping head. This allows the clamping head to be adjusted adaptively for deformation release while maintaining a relatively simple overall device structure through the use of standardized cylindrical actuators
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 clamping device conveniently releases machining deformation, ensuring high precision and quality of the machined parts by allowing adaptive clamping adjustments during the machining process.
Implementation Method 1
a fluid chamber is provided in the support cylinder... so as to adjust a vertical position of the support cylinder by introducing/discharging a fluid
Implementation Method 2
a laminated spring as an elastic member is provided in the peripheral wall and is elastically supported between the top wall and the concave washer
Data Source
AI summary
A clamping device and a machining method. The clamping device comprises: a base; a clamping head comprising a blind rivet and a locking member, the blind rivet comprising a middle column segment and enlarged portions at two ends, and the locking member being connected to an upper end of the blind rivet and defining a clamping opening; a lower cavity connected to the base; an upper cavity comprising an annular peripheral wall and a top wall having a central hole, the top wall being clamped between the two enlarged portions, the middle column segment of the blind rivet movably passing through the central hole, and the upper cavity being connected to the lower cavity in a fit manner; an elastic member located in the peripheral wall and supported between the enlarged portion at a lower portion of the blind rivet and the top wall; and a support cylinder movably fitted in the lower cavity, the support cylinder being supported below the elastic member.