As a core tool for plant morphology management, the function of garden pruning shears depends on the continuity of blade bite accuracy and mechanical transmission efficiency. The dynamic shearing mechanism of the double-edged structure requires the blade bevel angle to be maintained in a specific geometric range. The oxidation reaction caused by the residual plant sap will gradually change the crystal structure of the metal surface, resulting in the formation of microscopic gaps. The elastic decay of the spring component follows the stress relaxation law, which directly affects the handle reset speed and the linear transmission of shear force.
The lubricating medium of the garden pruning shears handle bearing is gradually lost in frequent friction, and the penetration of pollutants aggravates the wear of the rolling elements, causing the nonlinear increase of the opening and closing resistance. The integrity of the anti-rust coating is eroded by the acid and alkali secretions of the plant, and the local peeling area becomes the starting point of electrochemical corrosion. The wear of the back stop ratchet of the garden pruning shears blade will reduce the self-locking stability when shearing thick branches, and the UV aging resistance of the resin handle determines the durability of the grip comfort.
Maintenance operations are essentially active interventions in garden pruning shears material fatigue and interface failure, including organic residue removal, fit clearance calibration, and surface energy repair. Blade grinding needs to maintain the secondary chamfer angle set by the factory. Excessive grinding will destroy the distribution of the hardened layer. Lubricant selection follows the principle of balancing viscosity-temperature characteristics and biocompatibility to avoid contaminating the incision and affecting the formation of plant callus.
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