Tool Spindle Clamp Structure With Orthogonal Retention Pin
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Solution Overview
Problem
The existing upper die holder's engagement structure for fall prevention is unreliable during clamping failure, as the fall prevention key may disengage from the groove, leading to potential falls of the upper die.
Innovation Solution
A clamp device with a first member featuring a protrusion and a second member with a recess, where a pin member is inserted into a pin insertion hole at a direction orthogonal to the protrusion's insertion direction, serving as a retainer to maintain coupling even during clamping failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fall prevention key and groove engagement structure is used to prevent upper die fall, then fall prevention is achieved, but the structure becomes unreliable when clamping failure occurs
Solution Approach 1:
The engagement structure is divided into two independent functional components: a primary clamping mechanism (clamp member with clamp plate) and a secondary fall prevention mechanism (protrusion with retention groove). This segmentation allows each component to perform its specific function independently, so that clamping failure does not necessarily lead to fall prevention failure.
Solution Approach 2:
The protrusion is preliminarily positioned on the clamp plate, and the retention groove is preliminarily formed on the upper die before clamping occurs. This preliminary positioning ensures that when the upper die is installed, the protrusion is already aligned to engage with the retention groove, providing immediate fall prevention capability without requiring additional active components.
2Device complexity
If a single clamping mechanism is used to hold the upper die, then the structure is simple, but clamping failure can lead to both clamping loss and fall prevention failure
Solution Approach 1:
The invention merges two functions into a unified engagement structure: the clamp member provides clamping force through the clamp plate, while the protrusion integrated with the clamp plate provides fall prevention through engagement with the retention groove. This merging allows dual functionality (clamping + fall prevention) without requiring completely separate mechanisms, maintaining relative structural simplicity while improving reliability.
Solution Approach 2:
The retention groove extends in a direction substantially perpendicular to the clamping direction. This dimensional change creates a geometric constraint that prevents the upper die from falling off in the vertical direction, while the clamp member continues to provide horizontal clamping force. The orthogonal arrangement of functions adds a new dimension of safety without complicating the primary clamping mechanism.
Data Source
AI summary
A clamp device includes: a tool spindle including a protrusion; an additive-manufacturing head having a recess into which the protrusion is inserted in a first direction, the additive-manufacturing head being detachably coupled to the tool spindle; and a clamp mechanism portion that clamps mutually the recess and the protrusion inserted into the recess. The additive-manufacturing head includes a pin member. A pin insertion hole into which the pin member is inserted in a second direction intersecting the first direction is made in the tool spindle.