Drawing Die Tool With Shrink-Fitted Carbide Insert
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Solution Overview
Problem
Existing drawing die tools face challenges in achieving high dimensional accuracy, low frictional forces, and mechanical resistance while maintaining a compact size, especially during the cold working process of drawing metals, where frictional forces and high temperatures pose significant design constraints.
Innovation Solution
A drawing die tool design featuring a wear-resistant cemented carbide forming insert with a tapering outer surface, a steel sleeve made of hot working steel for shrink-fitting, and a securing element, which provides compressive pre-stress and reduces friction through a CVD coating, allowing for precise machining and high-temperature coating processes without compromising mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a wear-resistant forming insert is used in a drawing die tool, then mechanical resistance is improved, but frictional forces increase due to contact with the material
Solution Approach 1:
The drawing die tool is segmented into multiple functional components: a steel sleeve providing structural support and compressive pre-stress, a separate wear-resistant forming insert for mechanical resistance, and a CVD coating layer for friction reduction. This segmentation allows each component to optimize its specific function without compromising the others.
Solution Approach 2:
A CVD coating layer is introduced as an intermediary between the wear-resistant forming insert and the material being drawn. This coating layer serves as a mediator that reduces frictional forces while allowing the underlying forming insert to maintain its wear-resistant properties.
2Device complexity
If the drawing die tool is made compact, then device complexity is reduced, but dimensional accuracy deteriorates
Solution Approach 1:
The steel sleeve is subjected to controlled thermal parameters (heating and cooling cycles) to induce compressive pre-stress in the forming insert. This parameter change allows the compact tool structure to maintain high dimensional accuracy through stress-controlled precision.
3Strength
If compressive pre-stress is applied to the forming insert, then mechanical resistance is improved, but device complexity increases due to additional components
Solution Approach 1:
The steel sleeve and forming insert are merged into a integrated assembly where the sleeve serves multiple functions: providing structural support, applying compressive pre-stress through thermal contraction, and housing the forming insert. This merging reduces overall device complexity while maintaining mechanical resistance.
4Object-generated harmful factors
If CVD coating is applied to reduce friction, then frictional forces are reduced, but manufacturing complexity increases due to additional coating process
Solution Approach 1:
The CVD coating is applied as a preliminary action before the forming insert is installed in the drawing die tool. This preliminary coating ensures friction reduction is built into the component itself, eliminating the need for additional friction management mechanisms during operation.
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 achieves improved dimensional accuracy, reduced frictional forces, and enhanced mechanical resistance, enabling efficient drawing of tougher materials with increased speed and reduced wear, while maintaining a compact size and allowing for easy recycling of the forming insert.
Implementation Method 1
a steel sleeve made of hot working steel into which the wear-resistant forming insert is fitted by shrink-fitting, the steel sleeve providing compressive pre-stress to the wear-resistant forming insert
Implementation Method 2
reduced friction through a CVD coating
Implementation Method 3
the steel sleeve having an internal surface tapering in the working direction which is adapted for cooperating with the outer surface of the wear-resistant forming insert
Data Source
Figure 1~3
Figure 4~6c
AI summary
A drawing die tool (1) is provided, which comprises: a wear-resistant forming insert (5) having an outer surface (50) tapering in a working direction (W); a steel sleeve (4) made of hot working steel into which the wear-resistant forming insert (5) is fitted by shrink-fitting, the steel sleeve (4) having an internal surface (41) tapering in the working direction which is adapted for cooperating with the outer surface (50) of the wear-resistant forming insert (5) and an external surface (40); an outer casing (2) having an internal surface (25) in which the steel sleeve (4) together with the wear-resistant forming insert (5) is mounted with the external surface (40) of the steel sleeve (4) contacting the internal surface (25) of the outer casing (2); and a securing element (6) for securing the steel sleeve (4) and the wear-resistant forming insert (5) in the outer casing (2).