Differential Thread Clamping Sleeve for Precise Spindle Coupling
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Solution Overview
Problem
Existing clamping systems for rotary machining are inefficient in terms of quick changeover, precise positioning, and resistance to contamination, particularly due to fine threads that are prone to damage and contamination issues.
Innovation Solution
A clamping system utilizing a differential threaded sleeve with threads of different pitches and bayonet threads, along with a force transmission element and displaceable mating threads, ensures a secure and contamination-resistant connection between the workpiece holder and spindle, allowing for easy and precise coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fine thread with small pitch is used to achieve precise positioning and secure connection, then the connection reliability is improved, but the thread becomes more sensitive to contamination and more easily damaged
Solution Approach 1:
The threaded sleeve is divided into two separate threaded sections, each engaging with a different mating thread. This segmentation allows each thread to have optimal pitch characteristics - one thread can have finer pitch for precise positioning while the other has coarser pitch for contamination resistance and easier engagement.
Solution Approach 2:
The invention changes the thread pitch parameter by using two different pitches in the two threaded sections. The first threaded section has a first pitch while the second threaded section has a second pitch that differs from the first, allowing optimization of each thread for its specific function.
2Ease of operation
If a single threaded section with larger pitch is used to make threads more robust and less sensitive to contamination, then the ease of operation is improved, but the coupling torque required to achieve defined clamping force increases
Solution Approach 1:
The threaded sleeve is segmented into two threaded sections with different pitches. The first threaded section can have a coarser pitch for easier engagement and lower torque requirement, while the second threaded section provides the necessary clamping force through its engagement with the workpiece holder.
Solution Approach 2:
By changing the pitch parameter to have two different values in the two threaded sections, the invention optimizes the balance between ease of operation (coarser first pitch) and clamping force generation (second pitch configured for force transmission).
3Adaptability or versatility
If frequent changes of workpiece holders are performed to adapt to different production needs, then the adaptability is improved, but the time required for attachment and detachment increases
Solution Approach 1:
The differential threaded sleeve is designed to automatically perform the tightening action during the attachment process itself. As the workpiece holder is mounted on the spindle, the differential thread mechanism automatically generates the axial displacement needed to secure the connection, eliminating the need for separate tightening operations and reducing changeover time.
Solution Approach 2:
The invention introduces dynamic functionality to the threaded sleeve, which is not merely a static fastening component but an active mechanism that converts rotational movement into axial displacement. This dynamic behavior enables automatic tightening during attachment, facilitating quicker changes.
4Manufacturing precision
If a differential thread sleeve with two threaded sections of different pitches is used to achieve both fine positioning and robust threads, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The threaded sleeve is segmented into two threaded sections, each with different pitch characteristics. This segmentation allows the first section to provide fine positioning precision while the second section provides robust engagement, achieving both precision and simplicity through functional division.
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
The system achieves a robust and contamination-resistant connection with reduced risk of thread damage, enabling efficient and precise coupling and decoupling, while maintaining a secure torque transmission.
Implementation Method 1
The differential thread sleeve (50) has a first threaded section (52) which is designed for engagement with a first mating thread (36) on the workpiece holder (30) and a second threaded section (54) which is designed for engagement with a second mating thread (16) on the spindle (10). The rotational movement of the differential thread sleeve (50) causes it to be displaced axially, i.e., in the direction of the principal axis, relative to both mating threads, but to different degrees.
Data Source
Figure 1A~1B
Figure 2
Figure 3~4
AI summary
A clamping system comprising a spindle (10) and a workpiece holder (30) is known, particularly for the rotary machining of a workpiece held by the workpiece holder (30). The workpiece holder (30) has a receiving area (90) for receiving a workpiece. The spindle (10) is designed for mounting the workpiece holder (30), with the spindle and the workpiece holder having contact surfaces facing each other. A differential thread sleeve (50) with a first threaded section (52) and a second threaded section (54) with different thread pitches is provided for fastening the workpiece holder (30) to the spindle (10). A first mating thread (36) for the first threaded section (52) is provided on the workpiece holder (30), while a second mating thread (16) for the second threaded section (54) is provided on the spindle (10).