Integrated-Feed Electrospindle for Automatic HSK Tool Change
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Solution Overview
Problem
Integrated-feed spindle architectures in machine tools prevent the implementation of conventional automatic tool holder changing systems, such as the HSK type, due to the presence of a threaded portion that interferes with the actuation device.
Innovation Solution
A machining spindle with a tool-holder shaft featuring a control rod connected to the second portion of the shaft via a solid connection, and locking means that can switch between a solid and slidable connection between the first and second portions of the shaft, allowing axial movement for automatic tool holder changing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If control rod is solidly connected to second portion of shaft, then axial movement is enabled for tool holder changing, but connection between first and second portions must be switchable
Solution Approach 1:
The locking means act as an intermediary mechanism between the first and second shaft portions. When unlocked, they allow relative axial movement between the portions, enabling the control rod to move for tool holder changing. When locked, they provide a rigid connection for normal operation.
2Extent of automation
If conventional actuation device is used for HSK attachment system, then automatic tool holder changing is possible, but additional high-power actuation means are required
Solution Approach 1:
The second drive actuator (nut and threaded portion assembly) serves dual functions: it provides feed movement during normal integrated-feed operation and simultaneously acts as the actuation mechanism for automatic tool holder changing when the locking means are unlocked. This eliminates the need for separate high-power actuation means.
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 changing by allowing the control rod to move axially, overcoming the limitations of integrated-feed spindle architectures and avoiding the need for additional high-power actuation means.
Implementation Method 1
a first motor (10) having a rotor that is rotationally secured to a coupling member (11) designed to be slidably connected to a first portion (21) of the shaft (2) in order to drive the tool holder shaft (2) in rotation
Implementation Method 2
a second motor (30) having a rotor that is rotationally secured to a nut (31) fitted on a second portion (22) made up of a threaded portion (22) of the tool holder shaft (2), thereby forming a helical connection for axially moving the shaft (2)
Implementation Method 3
locking means (40) mounted so as to be movable between the first portion (21) and the second portion (22) of the shaft (2) by way of switching means
Data Source
AI summary
A machining spindle that includes a tool-holder shaft (2), a first actuator connected to a coupling member (11) slidably connected to a first section (21) of the shaft to rotate the shaft, a second actuator connected to a nut helically connected to a second section (22) of the shaft 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 includes a locking arrangement (40) mounted movable between the first and second sections by a switchover arrangement (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 relative to the first section, enabling the control rod to be moved axially under the action of the second actuator to control the attachment system in a released position of the tool holder.