Masking Jig Mechanical Fit to Prevent Detachment and Liquid Ingress
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Solution Overview
Problem
Existing masking jigs require manual operation to create negative pressure for attachment, risking detachment and liquid ingress during surface treatment, especially in vibrating environments.
Innovation Solution
A masking jig design with first and second fitting parts that securely fit around a cylindrical part of the object, using elastic deformation and sealing to attach without negative pressure, ensuring reliable attachment and preventing liquid ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If negative pressure is caused in the inner space of the bearing part to prevent the masking jig from coming off, then the masking jig can be held on the component, but the operation complexity increases and the liquid for surface treatment may be sucked into the bearing part
Solution Approach 1:
The patent extracts the harmful negative pressure mechanism from the attachment system and replaces it with a simple mechanical fitting structure. The first fitting part inserted into the bearing part and the second fitting part fitted onto the outer peripheral face provide attachment through direct mechanical engagement without requiring negative pressure, thereby eliminating the risk of liquid suction while reducing operational complexity
Solution Approach 2:
The masking jig is segmented into multiple functional parts: the first fitting part for insertion into the bearing part, the second fitting part for fitting onto the outer peripheral face, and the jig main body. This segmentation allows each part to perform its specific function independently, with the first fitting part providing secure mechanical attachment and the second fitting part providing additional stabilization, eliminating the need for complex negative pressure operations
2Reliability
If negative pressure is caused to secure the masking jig, then attachment is achieved, but liquid for surface treatment may be sucked into the bearing part when immersed
Solution Approach 1:
The patent removes the negative pressure mechanism that caused liquid suction and replaces it with positive mechanical engagement. The first fitting part inserted into the bearing part and the second fitting part fitted onto the outer peripheral face create a secure mechanical attachment that prevents liquid ingress without creating suction forces
Solution Approach 2:
The patent applies preliminary anti-action by designing the fitting structure to prevent liquid ingress before it can occur. The first fitting part and second fitting part are configured to create a sealed mechanical connection that blocks the path for liquid entry into the bearing part, countering the potential harmful effect before it can manifest
3Ease of operation
If the masking jig structure is simplified without negative pressure, then operation is easier, but the jig may come off under vibration or impact
Solution Approach 1:
The masking jig is divided into multiple functional components: the first fitting part for insertion into the bearing part providing primary attachment, and the second fitting part for fitting onto the outer peripheral face providing secondary stabilization. This segmentation allows simple mechanical operations while achieving reliable attachment that resists vibration and impact through distributed mechanical engagement
Solution Approach 2:
The patent transitions from a single-dimension attachment method (negative pressure) to a multi-dimensional mechanical fitting structure. The first fitting part provides attachment in the radial direction through insertion, while the second fitting part provides additional stabilization through fitting onto the outer peripheral face, creating attachment stability in multiple dimensions without complex operations
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 jig remains securely attached during surface treatment, resisting vibrations and impacts without needing negative pressure, thus preventing detachment and liquid entry.
Implementation Method 1
the jig main body includes a first fitting part having an outer peripheral face that is fitted into an inner peripheral face of the cylindrical part
Implementation Method 2
a second fitting part having an inner peripheral face that is fitted onto an outer peripheral face of the cylindrical part
Data Source
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AI summary
To provide a masking jig that can be attached to an object to be surface-treated with reliability without the need for causing a negative pressure in a space between the masking jig and the object to be surface-treated, and a surface treatment method using the same. A jig main body 11 of a masking jig 10 includes a first fitting part 12 that is fitted into an inner peripheral face of a bearing part 3 and a bushing 3a of a moving scroll 1 and a second fitting part 13 that is fitted onto an outer peripheral face of the bearing part 3 of the moving scroll 1, and therefore, the bearing part 3 and the bushing 3a of the moving scroll 1 can be held between the first fitting part 12 and the second fitting part 13 fitted thereto, and the jig main body 11 can be held on the moving scroll 1 with reliability. Therefore, it is not necessary to cause a negative pressure in the space between the masking jig and the object to be surface-treated as in the prior art, and even if a vibration or impact is exerted, the masking jig 10 can be effectively prevented from coming off the moving scroll 1.