Sheet Metal Piston Guide for Fuel Setting Tool
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Solution Overview
Problem
The existing combustion-powered setting tools require precise machining of solid bodies for piston guides and driving pistons to ensure a pressure-tight seal, which is costly and time-consuming, and often necessitate complex post-processing steps like honing and deburring.
Innovation Solution
The manufacturing method involves forming a piston guide from a bent sheet metal strip with a seam or toothed connection, allowing for ventilation openings and a textured inner surface that reduces friction and eliminates the need for deburring, using a process that includes punching and cold forming to achieve a pressure-tight seal without complex post-processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piston guides and driving pistons are machined from solid bodies to ensure precise fit and pressure-tight seal, then sealing reliability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The piston guide is manufactured from a sheet metal strip that is bent into a tubular shape and connected by seam or toothed form fit. This flexible shell approach replaces traditional solid body machining while maintaining the pressure-tight seal requirement through the flexibility and conformability of the sheet metal construction.
Solution Approach 2:
The invention changes the manufacturing parameters from solid body machining to sheet metal forming. By altering the material form (from solid block to sheet metal strip) and the manufacturing method (from machining to bending and joining), the patent achieves pressure-tight sealing with reduced manufacturing complexity.
2Manufacturing precision
If solid body machining is used to achieve precise dimensional accuracy, then sealing performance is improved, but production time and cost increase
Solution Approach 1:
The sheet metal strip is bent into a tube and connected by seam or toothed form fit, providing sufficient dimensional accuracy for the piston guide without requiring complex solid body machining. This approach significantly reduces production time while maintaining the necessary precision for functional performance.
Solution Approach 2:
The sheet metal construction allows for faster, more economical manufacturing compared to solid body machining. The simplified production process enables quicker fabrication and assembly, improving overall productivity while meeting functional requirements.
3Manufacturing precision
If complex post-processing steps like honing and deburring are applied to machined surfaces, then surface quality is improved, but manufacturing complexity and time increase
Solution Approach 1:
The sheet metal strip inherently provides a smooth surface quality suitable for the piston guide application without requiring additional honing or deburring steps. The bending and joining process maintains surface integrity, eliminating the need for complex post-processing operations and reducing manufacturing time.
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 efficiency of the hammer mechanism by increasing the impact energy delivered while reducing energy losses, allowing for a more efficient propulsion system with a simpler and cost-effective manufacturing process.
Implementation Method 1
a combustion chamber (7) for burning a fuel into combustion gases
Implementation Method 2
cold forming the sheet metal strip into a piston guide
Data Source
Figure 1
Figure 2~4
Figure 5~6
AI summary
The setting device (1) according to the invention for setting fixing elements (2) has a combustion chamber (7) for combusting a fuel into combustion gases. A drive piston (2) is guided on an inner surface (16) of a tubular piston guide (12). The drive piston (12) is driven by means of the combustion gases in the combustion chamber (7) and the piston guide (13). The piston guide is made of a sheet metal strip (21) which is curved into a tube, the two opposing longitudinal edges (22) of said sheet metal strip being connected by a seam (24) and/or a toothed form-fit (23).