Bolt Feeder Pusher Layout for Reliable Shaft Insertion
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Solution Overview
Problem
Existing bolt feeder systems experience improper welding due to the crushing of projections on the bolt head during the initial pressurization process, which affects the quality of the weld between the bolt head and the workpiece.
Innovation Solution
A bolt feeder system that includes a pusher member with a smaller diameter than the upper electrode, which protrudes from the upper electrode to push the bolt's top surface where projections are absent, reducing the risk of projection crushing and ensuring proper alignment and welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper electrode presses the top surface of the bolt head from above during the first pressurization to insert the shaft into the lower electrode, then the shaft insertion is achieved, but the projection on the top surface is crushed causing improper welding
Solution Approach 1:
The pusher member acts as an intermediary tool between the upper electrode and the bolt head. It has a diameter smaller than the upper electrode and is configured to push only the area where projections are absent, thereby mediating the force application to avoid crushing projections while still achieving shaft insertion into the lower electrode
2Force
If the upper electrode directly presses the top surface of the bolt head, then pressurization is applied, but the projection on the top surface is crushed
Solution Approach 1:
The pusher member is designed with a specific local quality - its diameter is smaller than the upper electrode, which allows it to apply force only to specific areas of the bolt head where projections are absent. This local force application achieves the necessary pressurization for shaft insertion while avoiding the harmful effect of crushing projections
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 configuration minimizes the crush of the bolt head projections, leading to improved welding quality by reducing improper welding caused by projection damage and ensuring reliable insertion of the bolt shaft into the lower electrode.
Implementation Method 1
The shaft is inserted into the insertion hole by the pusher member protruding from the tip end of the upper electrode and pushing an area of the top surface where the projection is absent
Implementation Method 2
a resistance welding machine that performs resistance-welding of a workpiece and a bolt using a lower electrode that is stationary and an upper electrode that moves up and down
Data Source
AI summary
A bolt feeder is for supplying a bolt to a resistance welding machine that performs resistance-welding of a workpiece and the bolt using a lower electrode. The bolt feeder comprises a holding unit configured to receive the bolt fed by a bolt feeding unit with a head located above a shaft, a moving unit configured to move the holding unit, and a pusher member configured to protrude from and retract into a tip end of the upper electrode. The bolt includes a projection on a top surface of the head which is opposite to a surface provided with the shaft. The lower electrode includes an insertion hole into which the shaft is inserted. The shaft is inserted into the insertion hole by the pusher member protruding from the tip end of the upper electrode and pushes an area of the top surface where the projection is absent.