Cylindrical Die Stock Holder With Segmented Grooves
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Solution Overview
Problem
Existing cutting stocks face limitations in stability, ease of assembly and disassembly, and machining performance due to complex manufacturing and high costs, with HSS tools being economical but performance-limited and hard metal tools being expensive and complex, and replaceable insert stocks having space constraints and complex handling.
Innovation Solution
A cylindrical cutting stock holder with transversely extending receiving grooves for cutting inserts and clamping wedges, featuring internal and external threads for secure fastening, allowing for easy assembly and disassembly, improved stability, and compensation of manufacturing tolerances, with clamping wedges arranged laterally for enhanced axial and radial fixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If replaceable cutting inserts are used in die stocks, then cutting edge replacement is enabled and machining performance is improved, but the number of cutting inserts is reduced due to space constraints and handling complexity increases
Solution Approach 1:
The die stock is segmented into modular components: holder, receiving grooves, clamping wedges, and cutting inserts. Each component serves a specific function and can be independently manufactured and replaced. The receiving grooves are divided into multiple slots arranged circumferentially, allowing multiple cutting inserts to be mounted simultaneously without interfering with each other's installation or removal.
Solution Approach 2:
The cutting inserts are extracted as separate, replaceable components from the die stock body. Instead of being integrated into the holder, they are mounted in receiving grooves and secured with clamping wedges, allowing easy removal and replacement without affecting the holder structure. This extraction enables individual insert replacement while maintaining the integrity of the overall tool.
2Ease of manufacture
If cutting inserts are made replaceable, then cost efficiency is improved by replacing only the insert, but securing the insert firmly without complex mechanisms becomes difficult
Solution Approach 1:
The receiving grooves are pre-formed with precise geometry in the holder during manufacturing, including the tapered walls and bottom surface that will receive the cutting insert. The clamping wedges are also pre-configured with the appropriate wedge angle and threading. This preliminary preparation ensures that when the insert is installed, it automatically achieves proper positioning and secure clamping without requiring complex adjustment mechanisms.
Solution Approach 2:
The clamping mechanism is designed to be self-actuating through the wedge principle. When the clamping wedge is inserted into the receiving groove and tightened, it automatically generates radial clamping force against the cutting insert through its tapered geometry, securing the insert firmly in place without requiring additional fastening operations or complex mechanisms. The wedge shape converts axial tightening force into radial clamping force automatically.
3Productivity
If multiple cutting inserts are arranged in the holder, then productivity is improved, but the space available for each insert is reduced and positioning precision becomes harder to maintain
Solution Approach 1:
The receiving grooves are arranged in multiple dimensions within the holder: circumferentially around the holder axis and radially at different distances from the center. This multi-dimensional arrangement allows multiple cutting inserts to be positioned precisely without interfering with each other. Each receiving groove has a unique spatial coordinate system defined by its angular position and radial distance, ensuring accurate positioning of multiple inserts simultaneously.
Solution Approach 2:
Each receiving groove is designed with locally optimized geometry tailored to its specific position in the holder. The groove dimensions, taper angle, and clamping wedge specifications can vary depending on the radial and circumferential position, allowing each insert to be securely held with precision appropriate for its location while maintaining overall tool balance and performance.
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 solution provides a stable and secure insert seating, simplifies handling, and improves machining properties by ensuring that cutting inserts are fixed axially, radially, and circumferentially, preventing unintentional detachment and allowing for precise positioning and force distribution during machining.
Implementation Method 1
an internal thread is provided inside the clamping wedges, and wherein each receiving groove is provided with a screw for fastening of the clamping wedges and cutting inserts in the respective receiving groove
Implementation Method 2
a secure insert seat is guaranteed and improved machining properties are also made possible
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to a die stock (10) having: • - a substantially cylindrical holder (12) having a plurality of receiving grooves (24) for receiving a detachably arranged cutting insert (26) and each detachably arranged clamping wedge (28), wherein each of these receiving grooves (24) extends in the axial direction (20) from a first end face (32) of the holder (12) extending transversely to the axial direction (20), and in the radial direction (30) from an inner side (22) of the holder (12) facing the longitudinal axis (18) of the holder, wherein each cutting insert (26) has at least one cutting edge (54) on a front side (62) substantially facing the longitudinal axis (18) of the holder, wherein the clamping wedges (28) are arranged in the respective receiving groove (24) laterally next to the cutting inserts (26) in the circumferential direction (34) transverse to the axial direction (20) and the radial direction (30); and • - a retaining means (36) for each receiving groove (24) for fixing the clamping wedges (28) and the cutting inserts (26) in the receiving groove (24) concerned.