Optimizing the nut production process requires focusing on process innovation, equipment upgrades, and refined management. Efficiency improvements, cost reductions, and quality stability can be achieved through technological integration and system improvements.
Core Process Optimization Directions
Promoting One-Step Cold Forging Technology
For complex structural parts such as dovetail nuts, hollow bolts, and shoulder-type double-ended bolts, innovative molds can be used to achieve one-step cold forging. For example:
Dovetail Nuts: Two-mold cold forging of the hexagon + three-mold floating extrusion of the dovetail eliminates the need for machining the dovetail.
Hollow Bolts: A reverse extrusion forming process is used, controlling the deformation rate at 36.9%, achieving one-step cold forging of the axial hole.
This type of optimization can reduce 2-3 processes and increase production efficiency by more than 30%.
Improving Thread Machining Accuracy and Consistency
Using high-precision thread rolling machines or CNC tapping machines, along with customized taps, improves the consistency of thread tooth profile. Introducing optical measuring instruments for online inspection enables 100% thread accuracy monitoring, reducing rework rates.
Optimizing heat treatment process parameters: Utilizing a controlled atmosphere furnace for segmented heating and cooling avoids deformation caused by uneven temperature. Simulation software is used to model stress distribution, resulting in a reasonable process curve and improved hardness uniformity after tempering.
Improving the environmental friendliness and adhesion of surface treatment: Promoting environmentally friendly coating technologies such as Dacromet and chromium-free passivation to replace traditional electroplating. Automated spraying lines ensure uniform film thickness (e.g., an 8μm electroplated zinc layer can withstand a 500-hour salt spray test), extending service life.
