Spark Plug Tip Positioning via Intermediary Pressing Member
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for manufacturing spark plugs by resistance welding a tip to a ground electrode lack adequate positioning accuracy, leading to variations in contact resistance and joint strength.
Innovation Solution
A method involving a positioning step where the ground electrode is aligned with a pressing member, followed by a tip pressing step using a second electrode, and a welding step that resistance welds the tip to the ground electrode, ensuring improved positioning accuracy and minimizing variations in contact resistance and joint strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser welding or resistance welding methods are used without specialized positioning mechanisms, then the manufacturing process is simpler, but the positioning accuracy of the tip relative to the ground electrode deteriorates
Solution Approach 1:
A positioning member is introduced as an intermediary component between the ground electrode and the pressing member. This positioning member includes a positioning protrusion that fits into a positioning groove on the ground electrode, providing precise alignment without requiring complex integrated positioning mechanisms. The pressing member simply needs to apply force through this intermediary positioning structure.
Solution Approach 2:
The positioning function is segmented from the pressing member and embodied in a separate positioning member. This allows the positioning mechanism to be simplified while maintaining accuracy, as the positioning member can be a simple component with a protrusion-groove interface rather than a complex integrated system.
2Reliability
If the pressing member contacts only the tip weld site area, then the positioning mechanism is simpler, but the contact resistance varies due to poor grounding stability
Solution Approach 1:
The grounding contact function is extracted from the tip pressing operation. The pressing member has a pressing surface that contacts the tip weld site for applying welding pressure, while the grounding contact portion contacts a separate grounding electrode. This separation ensures stable electrical grounding independent of the pressing force application point.
Solution Approach 2:
A grounding contact portion is introduced as an intermediary element to provide stable electrical contact. This grounding portion is separate from the pressing surface, allowing the pressing member to maintain consistent electrical connection while applying variable mechanical pressure during the welding process.
3Strength
If laser welding is used instead of resistance welding, then positioning accuracy can be maintained with simpler mechanisms, but the joint strength and reliability of the tip connection deteriorates
Solution Approach 1:
The tip and ground electrode are preliminarily positioned and fixed in precise alignment before the resistance welding operation begins. The positioning member with its protrusion-groove interface establishes the correct spatial relationship, and the pressing member maintains this positioning throughout the welding process, ensuring accurate joint formation.
Solution Approach 2:
The welding method uses resistance welding with controlled electrical parameters (current, time, pressure) rather than laser welding. The pressing member applies optimized pressing force to ensure good contact between the tip and ground electrode during resistance welding, achieving strong joints through parameter optimization rather than relying on complex positioning to compensate for welding process limitations.
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 method enhances the positioning accuracy of the tip relative to the ground electrode, reducing variations in contact resistance and joint strength, thereby improving the manufacturing process for spark plugs.
Implementation Method 1
a welding step of resistance welding the tip to the tip weld site of the ground electrode by the passage of electric current between the first and second electrodes
Data Source
AI summary
Disclosed is a method for manufacturing a spark plug of the type in which a tip is joined to a ground electrode. In a positioning step, the ground electrode is positioned with respect to a first electrode by means of a pressing member. In a tip pressing step, the tip is pressed against a tip weld site of the ground electrode by means of a second electrode. In a welding step, the tip is resistance welded to the tip weld site of the ground electrode by the passage of electric current between the first and second electrodes.