Electrospindle Locking Mechanism for Automatic HSK Tool Changes
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Solution Overview
Problem
Conventional spindles with integrated feed architecture cannot accommodate automatic tool holder changes, particularly with HSK attachment systems, due to the arrangement of actuation modules and the presence of threaded sections, which prevents the implementation of actuation devices necessary for loosening and tightening the tool holder.
Innovation Solution
A spindle design with a control rod connected to the second shaft section and locking means that pivotally mounted cams allow for tilting between complete and sliding connections, enabling axial movement of the second section relative to the first, allowing the control rod to loosen the tool holder attachment system during tool changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If threaded section and grooved section are in complete connection, then structural integrity is maintained, but axial movement is prevented which is needed for tool holder loosening
Solution Approach 1:
The connection between the threaded section and grooved section is made dynamic through the locking means. During normal operation, the locking means engage to provide a rigid connection maintaining structural integrity. During tool changing, the locking means disengage allowing axial movement of the threaded section relative to the grooved section, enabling the control rod to move and loosen the tool holder. This dynamic connection resolves the contradiction between strength and operational flexibility.
Solution Approach 2:
The locking means are positioned and configured in advance to allow automatic disengagement when tool changing is required. The control rod is preliminarily arranged to interact with the locking means, causing them to disengage before the tool holder loosening action begins. This preliminary arrangement ensures that the structural integrity is maintained during machining while enabling easy tool holder loosening when needed.
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
Enables automatic tool holder changes by utilizing existing spindle components, avoiding the need for additional high-power actuation systems and allowing axial movement of the threaded section relative to the grooved section, thus facilitating tool holder attachment system loosening and tightening.
Implementation Method 1
a first motor (10) for rotational drive... The first motor 10 has a rotor integral in rotation with a coupling member 11
Implementation Method 2
a second motor (30) for axial movement... a nut (31) engaged on a second section constituted by a threaded section (22) of the tool-holder shaft (2), thus forming a helical connection
Implementation Method 3
a nut (31) engaged on a second section constituted by a threaded section (22) of the tool-holder shaft (2), thus forming a helical connection making it possible to axially move the shaft (2)
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a machining spindle comprising a tool-holder shaft (2), a first actuator connected to a coupling member (11) slidably connected to a first section (21) of the shaft in order to rotate the shaft, a second actuator connected to a nut helically connected to a second section (22) of the shaft in order to move the shaft axially and a control rod (24) of a tool-holder attachment system connected to the second section by a full connection. The spindle comprises locking means (40) mounted movable between the first and second sections by means of switchover means (50), between a first position in which the first and second sections are in full connection and a second position allowing axial movement of the second section with respect to the first section, enabling the control rod to be moved axially under the action of the second actuator in order to control the attachment system in a released position of the tool holder.