Angled Shear Blade Insert Mounting to Reduce Stress Fractures
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Solution Overview
Problem
Conventional hydraulic cutting tools face challenges in cutting effectiveness, durability, and stress-related fractures due to complex fastening mechanisms and stress peaks in shear blades, which compromise their performance and longevity.
Innovation Solution
A shear blade design featuring a recess for inserting the blade at a pointed angle, eliminating the need for complex fastening components, with angled fastening components and surface profiling to distribute pressure effectively, reducing stress and enhancing durability and cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If complex fastening mechanisms (clamping claws, screws, pins) are used to secure cutting inserts, then the cutting insert can be firmly held, but the device complexity increases and the risk of stress-induced fractures increases
Solution Approach 1:
The patent removes the complex fastening mechanism (clamping claws, screws, pins) entirely and replaces it with a simplified retention system where the cutting insert is held by its own geometry within a retaining pocket, eliminating unnecessary components while maintaining secure holding
Solution Approach 2:
The cutting insert is designed with its own retention features (recesses and form-locking surfaces) that enable it to secure itself within the shear blade without external fastening components, making the system self-sufficient and eliminating complex fastening mechanisms
2Strength
If additional recesses and form-locking surfaces are added to the cutting insert for secure retention, then the holding strength improves, but stress peaks increase leading to fracture risk
Solution Approach 1:
The patent changes the geometric parameters of the cutting insert and retaining pocket to create optimal form-locking surfaces and recesses that provide secure retention while distributing stresses uniformly, avoiding stress concentrations that lead to fractures
3Ease of operation
If the cutting insert is inserted parallel to the contact surface, then the insertion is simple, but the force absorption capability is reduced
Solution Approach 1:
The patent introduces asymmetric geometry where the cutting insert is inserted at an angle to the contact surface, creating an angled form-fit connection that simultaneously achieves easy insertion and superior force absorption capability through the angled retention surfaces
Data Source
AI summary
A shear blade (2) is for a portable hydraulic cutting device, such as a rescue device having a blade body (9). The blade body (9) has an assembly region (18) and a cutting region (15), a cutting edge (16) in the cutting region (15), a contact surface (13), located on one side of the cutting edge (16), for an additional shear blade. An outer surface (14), located on the other side of the cutting edge (16), is provided to act on the object to be cut. The cutting region (15) has a recess (22) for receiving a cutting insert (21). The recess (22) is configured such that the cutting insert (21) is insertable into the recess (22) at an acute angle δ to the contact surface (13) of the shear blade (2).