Wire Bobbin Fixing Structure With Oblique Nut Hole
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Solution Overview
Problem
The existing methods for fixing wire bobbins to wire electrical discharge machines are inefficient, leading to misalignment of the bobbin's rotational center with the machine's axis, causing eccentric rotation and instability in wire electrical discharge machining, which decreases work efficiency and requires frequent nut tightening.
Innovation Solution
A fixing structure and method using a bolt, regulating member, and nut with an obliquely formed through hole and tapered portion, allowing the nut to be aligned and screwed in a way that the wire bobbin is securely attached and detached quickly, ensuring axial alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operator uses a conventional nut to fix the wire bobbin, then the bobbin can be attached to the bolt, but the operator needs to turn the nut up to the position of the wire bobbin on the distal end side of the bolt, which takes time
Solution Approach 1:
The through hole is formed obliquely relative to the axis of the threaded hole, creating a dimensional offset that allows the nut to be positioned correctly without requiring full rotation along the bolt axis. This angular dimension change enables the nut to engage the threaded hole while being positioned at the correct location relative to the wire bobbin, eliminating the time-consuming turning operation.
2Reliability
If the operator attaches the wire bobbin manually by screwing the nut on the bolt, then the bobbin can be fixed, but it takes time to attach and detach the wire bobbin
Solution Approach 1:
The through hole is pre-formed at an oblique angle with a larger inside diameter than the bolt, and the threaded hole is positioned such that the bolt passes through the through hole and engages the threaded hole automatically when the nut is positioned. This preliminary configuration of the hole geometry and relative positioning eliminates the need for time-consuming manual alignment and turning operations, while maintaining reliable fixation.
3Ease of operation
If the bolt is located at a position higher than the workpiece machining position and mounted horizontally, then the wire bobbin can be attached, but the operator needs to support the wire bobbin and align its rotational center with the bolt axis while screwing the nut
Solution Approach 1:
The oblique through hole creates a geometric guide that automatically aligns the nut with the correct position and orientation relative to the wire bobbin. The oblique angle and larger diameter of the through hole provide a self-aligning mechanism that reduces the complexity of manual alignment operations, as the hole geometry itself guides the positioning.
4Ease of operation
If the operator uses a speed-nut with an obliquely formed through hole to fix the wire bobbin, then the bobbin can be fixed even if the bolt axis and bobbin rotational center are misaligned, but the wire bobbin rotates eccentrically causing unstable machining
Solution Approach 1:
The through hole is formed obliquely at a specific angle and with a controlled inside diameter that is greater than the bolt outside diameter but within precise limits. This oblique configuration, combined with the specific dimensional relationship between the through hole and bolt, creates a geometric constraint that guides the nut and bolt into proper alignment, preventing eccentric rotation while maintaining ease of attachment.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
In a fixing structure and fixing method of a wire bobbin (24), the wire bobbin (24) is abutted against a regulating member (62) with a bolt (64) inserted into an insertion hole (24c) of the wire bobbin (24). Then, a nut (70) is brought close to the wire bobbin (24) while the bolt (64) is inserted into an obliquely formed through hole (72) and the nut (70) is kept inclined so that the axis of the through hole (72) is substantially aligned with the axis of the bolt (64). Thereafter, the inclination of the nut (70) is returned so that the axis of threaded hole (68) becomes substantially aligned with the axis of the bolt (64), and then the nut (70) is turned so as to insert part of a tapered portion (74) into the insertion hole (24c).