Partial Plating Drum Jig Brake Unit Pitch Compensation
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Solution Overview
Problem
Conventional partial plating apparatuses experience variations in plated-film thickness due to pitch differences between positioning pins and guide holes on the drum jig, leading to uneven plating distribution, especially as the size of plated areas decreases in electronic devices.
Innovation Solution
A partial plating apparatus with a drum jig having positioning pins with a smaller pitch than guide holes, and a brake unit attached to the rotary shaft to slow down the drum jig, canceling out pitch differences and ensuring consistent plating by only applying the plating solution in a specific region of contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pitch of positioning pins is made equal to the pitch of guide holes, then the positioning accuracy is improved, but manufacturing precision deteriorates due to accumulated pitch differences
Solution Approach 1:
The patent applies preliminary anti-action by deliberately designing the positioning pin pitch to be slightly smaller than the guide hole pitch (creating a preliminary offset) so that the accumulated pitch difference acts in the opposite direction to compensate for the natural expansion of the drum jig during operation. This pre-established offset counteracts the expansion effect, maintaining consistent positioning accuracy throughout the plating process.
Solution Approach 2:
The patent changes the pitch parameter of the positioning pins from being equal to the guide hole pitch to being slightly smaller. This parameter modification creates a controlled pitch difference that, when accumulated, compensates for the drum jig's thermal expansion during operation, thereby resolving the contradiction between positioning accuracy and plated-film thickness uniformity.
2Stability of the object's composition
If the drum jig rotates at the same circumferential velocity as the metal member, then the engagement between positioning pins and guide holes is maintained, but pitch differences accumulate causing plating variations
Solution Approach 1:
The patent uses preliminary anti-action by pre-establishing a pitch offset between positioning pins and guide holes that counteracts the accumulated positioning errors during rotation. This allows the drum jig to rotate at the same circumferential velocity as the metal member while the pre-designed pitch difference compensates for expansion effects, preventing plating variations.
3Manufacturing precision
If the pitch of positioning pins is made smaller than guide holes, then plated-film thickness uniformity is improved, but positioning precision deteriorates
Solution Approach 1:
The patent changes the pitch parameter of positioning pins to be slightly smaller than guide holes. This parameter change creates a controlled pitch difference that accumulates to compensate for drum jig expansion, improving plated-film thickness uniformity while maintaining adequate positioning precision through proper tolerance design.
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
This solution reduces film thickness variations by maintaining engagement between positioning pins and guide holes, ensuring even plating distribution without the need for complex control systems or additional feedback mechanisms, thus improving the consistency and efficiency of the plating process.
Implementation Method 1
a brake unit attached to the rotary shaft and configured to reduce a circumferential velocity of the drum jig
Implementation Method 2
a jet portion configured to supply a plating solution to the metal member
Data Source
AI summary
A partial plating device includes a drum jig which has a plurality of positioning pins provided on the outer peripheral surface thereof, and which feeds a metal member around the outer periphery thereof by engaging the metal member with the positioning pins; a rotating shaft which rotatably supports the drum jig, a jet unit that supplies plating liquid to the metal member, and a brake unit that reduces the circumferential speed of the drum jig, and which is fitted to the rotating shaft. A plating device and a partial plating method in which plating is not carried out on the first region of a metal member on the carrying-in side of the drum jig, but in which plating is carried out on the second region of a metal member on the carrying-out side.