Watch Part Forging and Heat Treatment for Uniform Mirror Finishing
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Solution Overview
Problem
Existing watch part manufacturing methods face limitations in achieving uniform crystal grain size and isotropic crystal orientation, leading to non-uniform polishing and reduced mirror finishing quality, which affects the luxury perception of the watch.
Innovation Solution
A method involving forging and heat treatment of metal raw materials using a die designed to control distortion within a predetermined range, followed by heat treatment conditions tailored to achieve uniform crystal grain size and isotropic crystal orientation, ensuring consistent polishing results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the metal composition is processed into a cylindrical shape by rolling, forging, or drawing, then the watch part can be manufactured, but the crystal grain size becomes non-uniform and the crystal orientation becomes anisotropic, which limits the mirror finishing quality
Solution Approach 1:
The invention changes the key parameter of crystal grain structure by introducing a specific forging process with controlled distortion magnitude and subsequent heat treatment. This transforms the metallographic structure from non-uniform/anisotropic to uniform/isotropic, thereby improving mirror finishing quality while maintaining ease of manufacture
Solution Approach 2:
The invention performs preliminary action by controlling the distortion magnitude during forging to fall within a specific range before proceeding to heat treatment. This preliminary control of distortion ensures that the subsequent heat treatment can effectively produce uniform crystal grain size and isotropic orientation, resolving the contradiction between manufacturing ease and finishing quality
2Ease of operation
If polishing is performed on a watch part with non-uniform crystal grain size or anisotropic crystal orientation, then the watch part can be finished, but the surface cannot be uniformly polished, limiting the mirror finishing quality
Solution Approach 1:
The invention changes the metallographic structure parameters (crystal grain size uniformity and crystal orientation isotropy) through controlled forging and heat treatment. This creates an optimal substrate structure that enables uniform polishing results, resolving the contradiction between polishing ease and mirror finishing quality
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 method enhances mirror finishing quality by ensuring uniform crystal grain size and isotropic crystal orientation, resulting in a higher sense of luxury for the finished watch parts.
Implementation Method 1
heat treatment is performed under a heat treatment condition set according to the magnitude of the distortion of the processing target portion
Implementation Method 2
make a crystal grain size of the processing target portion uniform and to make a crystal orientation isotropic
Data Source
AI summary
A watch part manufacturing method includes: preparing a metal raw material; manufacturing a watch part material including a processing target portion to be cut by performing forging and heat treatment on the metal raw material; and cutting out a watch part from the processing target portion of the watch part material by cutting, and polishing the watch part, in which in the forging, the metal raw material is shaped using a die designed such that a magnitude of distortion of the processing target portion in the watch part material falls within a predetermined range, and the heat treatment is performed under a heat treatment condition set according to the magnitude of the distortion of the processing target portion in the watch part material shaped by the forging to make a crystal grain size of the processing target portion uniform and to make a crystal orientation isotropic.