Resin Molded Product Through Hole Reference Alignment
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Solution Overview
Problem
Resin molded products used in vehicles face challenges in accurate dimensional inspection, particularly when reference and assembly locations are on different surfaces, leading to increased measurement errors and man-hours due to the need for relay points, which complicates the measurement process.
Innovation Solution
Incorporating a reference portion with a through hole that penetrates the plate thickness direction and opens on both surfaces, allowing for direct measurement from either side, thereby serving as a common reference for dimensional inspection and reducing measurement errors and man-hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference portion is provided on one surface of the plate portion for alignment with a mating member, then alignment accuracy is improved, but measurement complexity increases when the assembly location is on the opposite surface
Solution Approach 1:
The invention introduces a through hole that penetrates the plate portion in the thickness direction, creating a new measurement dimension. By forming the reference portion as a through hole opening on both surfaces, measurement can be performed from either surface directly, eliminating the need for relay point measurements when assembly locations are on opposite surfaces.
Solution Approach 2:
The through hole reference portion serves multiple functions: it provides alignment reference for mating members on either surface of the plate portion, and simultaneously serves as a measurement reference for assembly locations on both surfaces. This multi-functional design eliminates the need for separate relay points for different measurement scenarios.
2Ease of operation
If relay points are used to measure relative position between reference portion and assembly location on different surfaces, then measurement can be performed, but measurement error increases and man-hours increase
Solution Approach 1:
By creating a through hole that penetrates the plate portion, the invention enables direct line-of-sight measurement from both surfaces. This dimensional change eliminates the need for indirect relay point measurements, thereby reducing cumulative measurement errors and decreasing the number of measurement steps required.
3Strength
If a solid reference portion is used for alignment, then structural integrity is maintained, but weight increases and molding shrinkage deformation occurs
Solution Approach 1:
The invention uses a through hole (void space) within the reference portion instead of solid material. This porous/void structure reduces the weight of the reference portion while maintaining its alignment function. The through hole configuration minimizes material usage while preserving the reference portion's structural role in alignment.
Solution Approach 2:
The invention extracts material from the reference portion by forming a through hole, removing unnecessary solid material that contributes to weight and molding shrinkage deformation. The through hole maintains the reference portion's alignment function while eliminating excess material that would otherwise increase weight and susceptibility to deformation.
Data Source
AI summary
A resin molded product includes a plate portion having a plate-like shape and having assembly locations in which a mating member is assembled on both surfaces of the plate portion in a plate thickness direction, a reference portion provided on one surface of the plate portion and used for alignment with the mating member, and a through hole which penetrates the reference portion in the plate thickness direction and opens on the both surfaces of the plate portion. The reference portion has a columnar shape extending in the plate thickness direction, and the through hole opens at an extending end of the reference portion and extends in the plate thickness direction to open on the other surface of the plate portion. The plate portion further includes a terminal provided so as to extend in the plate thickness direction at the assembly location on the other surface.