Friction-Welded Cylinder Head Assembly for Narrow Space Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing water-cooled internal combustion engine cylinder heads face challenges in manufacturing due to complex casting processes, which result in high costs, environmental pollution, and difficulties in achieving smooth, high-speed welding in narrow spaces, leading to rough weld joints and deformation issues.
Innovation Solution
A friction-welded structure assembly is introduced, featuring a first workpiece with a support shoulder and a second workpiece with a throughhole, where a friction welding connecting part is used to heat and weld the interfaces under pressure, allowing for quick, economic, and reliable integration of the cylinder head parts using a chucking device and rotary pressing jig.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional casting process with sand cores is used to manufacture cylinder heads, then the cooling water chamber can be formed, but the manufacturing cost increases and environmental pollution occurs
Solution Approach 1:
The cylinder head is divided into multiple separate parts (first workpiece, second workpiece, friction welding connecting part) that are manufactured independently using die casting process, then assembled through friction welding. This segmentation eliminates the need for complex sand core casting while enabling environmental-friendly manufacturing.
2Reliability
If welding is conducted in narrow spaces at hole mouths to join cylinder head parts, then the parts can be connected, but welding speed decreases and deformation increases
Solution Approach 1:
A friction welding connecting part is introduced as an intermediary component between the first and second workpieces. This connecting part provides accessible welding surfaces that can be rapidly welded using friction stir welding or flash butt welding, eliminating the need to weld directly in narrow spaces at hole mouths and thereby increasing welding speed while maintaining joint quality.
Solution Approach 2:
The friction welding connecting part is pre-positioned on the first workpiece before the second workpiece is attached. This preliminary positioning creates accessible welding interfaces that can be quickly joined, avoiding the need for difficult post-assembly welding in constrained spaces.
3Strength
If welding is performed to join cylinder head parts, then the parts are connected, but the weld joint surfaces become rough and require grinding
Solution Approach 1:
Traditional arc welding or gas welding processes are replaced with friction stir welding or flash butt welding. These alternative welding methods produce smoother weld joints with better surface quality, eliminating or reducing the need for subsequent grinding operations while maintaining joint strength.
4Reliability
If densely-disposed junction interfaces are welded at hole mouths, then the cylinder head parts are connected, but welding cost increases and deformation is difficult to control
Solution Approach 1:
The friction welding connecting part serves as a mediator that simplifies the welding of densely-disposed junction interfaces. By providing standardized welding interfaces on the connecting part, the complexity of welding multiple narrow spaces is reduced, while structural integrity is maintained through reliable friction welding joints.
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 enables efficient, aesthetically pleasing, and reliable welding of densely-disposed junction interfaces in narrow spaces, reducing manufacturing costs and environmental impact while improving the quality of weld joints.
Implementation Method 1
the friction welding connecting part is tightly pressed on both the first workpiece and the second workpiece which are positioned to be relatively corresponding and fixed to each other, while being moved under a pressure, so as to heat the first friction welding junction interface and the second friction welding junction interface
Data Source
AI summary
The invention provides a friction-welded structure assembly, comprising a first workpiece (10B), a second workpiece (10C) and a friction welding connecting part (10A). The lower side of the friction welding connecting part (10A) has a first friction welding junction interface (10H) which is in contact with a surface of the first workpiece (10B) and a second friction welding junction interface (11H) which is in contact with a surface of the second workpiece (10C). The friction welding connecting part (10A) is tightly pressed on both the first workpiece (10B) and the second workpiece (10C) which are positioned to be relatively corresponding and fixed to each other, while being moved under a pressure, so as to heat said first friction welding junction interface (10H) and said second friction welding junction interface (11H), then said friction welding connecting part (10A) is stopped under the pressure, and said first friction welding junction interface (10H) and said second friction welding junction interface (11H) become cool, thereby said first workpiece (10B) and said second workpiece (10C) are welded together to form the friction-welded structure assembly via said friction welding connecting part (10A). Also, The invention relates to a water-cooled internal combustion engine cylinder head using the friction-welded structure assembly described above.