Conical Cam Screw Shear for Burr-Free Blade Fitting
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Solution Overview
Problem
Conventional screw-cutting shears often produce screws with burrs due to gaps between the moving and stationary blades during the shearing process.
Innovation Solution
A screw-cutting shear design that incorporates a conical cam surface and roller interaction, ensuring the moving and stationary blades are tightly fitted to shear off screws without gaps, utilizing a driving assembly with an electric motor and planetary gear reducer for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional flat blade fitting is used, then the structure is simple, but gaps form between blades causing burrs on sheared screws
Solution Approach 1:
The patent applies curvature by replacing the conventional flat blade fitting with a conical cam surface and roller mechanism. The conical cam surface (with angle α between 30°-60°) and roller create a curved geometric relationship that eliminates gaps between the moving blade and stationary blade, achieving burr-free cutting while maintaining structural feasibility through the curved contact surfaces.
Solution Approach 2:
The patent changes the geometric parameters of the blade fitting mechanism by introducing a conical cam surface with a specific angle α (30°-60°) instead of a flat surface. This parameter change transforms the fitting relationship from gap-prone flat contact to precise conical contact, ensuring the moving blade fits tightly against the stationary blade throughout the cutting stroke, thereby eliminating burrs.
2Manufacturing precision
If conventional driving mechanism is used, then the device is simple, but cutting precision and reliability are insufficient
Solution Approach 1:
The conical cam surface replaces the conventional flat driving surface, creating a curved geometric relationship that ensures precise and reliable blade fitting throughout the cutting stroke. The conical geometry with angle α (30°-60°) maintains continuous contact between the roller and cam surface, eliminating gaps and ensuring consistent cutting precision.
Solution Approach 2:
The patent introduces dynamic elements including a rotatable cam driven by an electric motor through a speed reducer, and a roller that rotates on the shear lever. This dynamic mechanism allows the conical cam surface to maintain optimal contact with the roller throughout the cutting cycle, adapting to the motion requirements and ensuring both precision and reliability.
Solution Approach 3:
The patent replaces conventional mechanical driving mechanisms with an electric motor-driven system incorporating a speed reducer. This substitution provides more precise control over the cam rotation speed and positioning, thereby enhancing cutting precision and reliability while reducing mechanical complexity through standardized motor and reducer components.
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 prevents burr formation on sheared-off screws by ensuring a tight fit between the blades, while the planetary gear reducer enhances precision and reliability in the shearing process.
Implementation Method 1
the cam surface and the roller outer circular surface being conical surfaces fitted with each other at an angle of X° so that when the cam is rotating, an axial component force is applied against the roller
Implementation Method 2
the speed reducer being mounted to the stationary housing
Data Source
AI summary
A screw-cutting shear includes a shearing assembly including a shear base, a stationary blade, a shear lever, a moving blade, a reset spring, a cam, and a roller; and a driving assembly including an electric motor driving the cam to rotate and a speed reducer, a cam surface and a roller outer circular surface interacting to drive the shear lever to swing to drive the moving blade and the stationary blade to be fitted to shear off a screw, the cam surface and the roller outer circular surface being conical surfaces fitted with each other at an angle of X° so that when the cam is rotating, an axial force component is applied against the roller; under the action of the force, the shear lever moves axially along the bolt, so that the moving and stationary blades press against a sheared end face.