Shearing Blade Insert With Undercut Seat And Pin Fastening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing attachment methods for knife inserts in shearing knives are complex and time-consuming, especially in harsh operating conditions, due to the need for screw connections and internal threads, which can be difficult to maintain and replace.
Innovation Solution
A shearing knife design featuring an undercut surface on the base body and a form-fitting surface on the knife insert, secured by pin-shaped plug-in connecting elements, eliminating the need for screw connections and allowing for a stable and easy replacement of the knife insert.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw connections with internal threads are used to fasten knife inserts, then the attachment is secure, but the production complexity and replacement time increase
Solution Approach 1:
The invention extracts the threading function from the fastening system by using externally threaded plug-in connection elements instead of internal threads in the base body or knife insert. This eliminates the need for complex internal threading while maintaining secure attachment through the external threads on the plug-in elements engaging with the undercut seat geometry.
Solution Approach 2:
The fastening system is segmented into separate functional components: the undercut seat geometry provides the engagement surface, while the plug-in connection elements provide the threaded fastening function. This segmentation allows each component to be optimized independently and simplifies manufacturing compared to integrated threaded holes.
2Reliability
If internal threads are provided in base body or knife insert, then secure fastening is achieved, but the replacement process becomes time-consuming
Solution Approach 1:
The plug-in connection elements are pre-threaded externally, eliminating the need to cut or tap internal threads during assembly or replacement. The undercut seat geometry is pre-formed to guide and engage the plug-in elements, allowing for rapid installation without time-consuming threading operations.
3Reliability
If traditional screw connections are used, then the knife insert is securely fixed, but the production of individual components becomes more complex
Solution Approach 1:
Instead of providing internal threads in the base body or knife insert (traditional approach), the invention inverts the threading to the external plug-in connection elements. This inversion simplifies the base body and knife insert manufacturing while maintaining secure fixation through the external threading mechanism.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a shearing blade (2) for a cutting device (1), comprising a main body (3) that has a seat (11) and a blade insert (4) that is arranged on the seat (11) and forms a cutting wedge (8), wherein the cutting wedge (8) forms a cutting edge (6) by means of a flank face (9) and a pressure face (10) at an angle to the flank face. The seat (11) has at least one undercut face (13, 28) that acts in a direction transverse to the flank face (9). When the blade insert (4) is inserted, the undercut face (13, 28) interacts with at least one form-closure face (16, 27) formed on the blade insert, whereby a form closure taking effect transversely to the flank face (9) is established. The blade insert (4) is fastened to the main body (3) by means of at least one pin-shaped plug-in connection element (5), which is oriented perpendicular to the flank face (9) and which is arranged in aligned holes (18, 19) in the main body (3) and in the blade insert (4).