Reciprocating Saw Spindle Throughbore to Eliminate Bushing Welding
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Solution Overview
Problem
The manufacturing process of reciprocating saws is complicated and costly due to the use of bushings with spindles, which requires an expensive and complex welding process.
Innovation Solution
A spindle with a throughbore formed via a flow welding process, eliminating the need for bushings by machining a portion of the spindle and using a rod to displace material and form a collar, simplifying the manufacturing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bushings are used with the spindle, then the spindle can connect to the wobble plate, but the manufacturing process becomes expensive and complex due to required welding
Solution Approach 1:
The invention merges the bushing component with the spindle by forming an integral throughbore directly in the spindle body. This eliminates the separate bushing part and its associated welding connections, achieving both reliable connection and simplified manufacturing. The throughbore is formed using flow welding process that displaces material to create the bore and a collar structure in one integrated operation.
2Reliability
If bushings are used with the spindle, then the spindle can connect to the wobble plate, but the manufacturing cost increases due to expensive welding processes
Solution Approach 1:
The invention merges the bushing component with the spindle by forming an integral throughbore directly in the spindle body. This eliminates the separate bushing part and its associated welding connections, achieving both reliable connection and simplified manufacturing. The throughbore is formed using flow welding process that displaces material to create the bore and a collar structure in one integrated operation.
3Reliability
If bushings are used with the spindle, then the spindle can connect to the wobble plate, but the manufacturing time increases due to complex welding processes
Solution Approach 1:
The invention merges the bushing component with the spindle by forming an integral throughbore directly in the spindle body. This eliminates the separate bushing part and its associated welding connections, achieving both reliable connection and simplified manufacturing. The throughbore is formed using flow welding process that displaces material to create the bore and a collar structure in one integrated operation.
4Ease of manufacture
If a throughbore is formed by flow welding process, then the manufacturing process is simplified and costs are reduced, but the spindle structure changes
Solution Approach 1:
The invention uses flow welding process to fundamentally change the material state and formation method of the throughbore. Instead of machining or assembling, the process heats and displaces material to form the throughbore and collar structure in one operation. This parameter change in the manufacturing process achieves simplification while creating a specific structural form with integrated collar.
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 approach simplifies the manufacturing process, reduces costs, and ensures compatibility with various drive mechanisms, including wobble plate drives, by eliminating the need for complex welding and allowing for easier design specifications adjustments.
Implementation Method 1
forming a throughbore extending through the first portion via a flow welding process. The flow welding process includes rotating a rod relative to the spindle and inserting the rod into the first portion of the spindle, thereby displacing material from the spindle in a direction away from the rod to form the throughbore and a collar adjacent the throughbore
Data Source
AI summary
A method of manufacturing a spindle for a reciprocating saw includes machining a first portion of the spindle and forming a throughbore extending through the first portion via a flow welding process. The flow welding process includes rotating a rod relative to the spindle and inserting the rod into the first portion of the spindle, thereby displacing material from the spindle in a direction away from the rod to form the throughbore and a collar adjacent the throughbore.