Exchangeable Rotary Cutting Inserts With Central Front Clamping
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Solution Overview
Problem
Rotary tools experience high wear and reduced mechanical stability when processing aluminum and soft metals with high silicon content, leading to shortened tool life and increased costs due to the need for frequent replacements, especially when working with interchangeable cutting inserts.
Innovation Solution
A rotary tool design featuring two interchangeable cutting inserts, where the second cutting insert is fixed via a central position within the tool head, using a screw or bolt that is fully enclosed and experiences minimal wear, allowing for precise alignment and adjustable positioning to extend tool life and reduce material and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If interchangeable cutting inserts are used to extend tool life, then the service life of the tool body is improved, but the mechanical stability and precision of the cutting insert positioning deteriorate due to wear and loosening
Solution Approach 1:
The cutting insert is designed with a movable positioning element (e.g., a ball or dome-shaped feature) that can dynamically adjust its position within a corresponding recess in the tool body. This allows the insert to self-center and maintain precise positioning despite wear or thermal expansion, while still being securely retained. The dynamic adjustment mechanism ensures both long service life and high mechanical stability.
2Productivity
If multiple cutting inserts are integrated into one tool to reduce replacements, then productivity is improved, but the device complexity increases due to additional clamping and positioning mechanisms
Solution Approach 1:
A single clamping and positioning mechanism is designed to accommodate multiple different cutting inserts with various functions (e.g., drilling, countersinking, reaming). The universal interface allows different inserts to be mounted on the same tool body using the same retention and positioning system, enabling multiple machining operations without increasing device complexity. This multi-functional design maintains simplicity while enhancing productivity.
3Manufacturing precision
If the cutting insert is securely clamped to maintain precision, then manufacturing precision is improved, but the ease of replacement of the cutting insert deteriorates
Solution Approach 1:
The clamping mechanism is segmented into a removable clamping element (e.g., a separate clamp or locking feature) that can be independently operated from the positioning elements. This allows the cutting insert to be quickly released and replaced by simply disengaging the segmented clamping component, while the positioning features remain intact to ensure precise repositioning of the new insert. The segmentation enables easy replacement without compromising positioning precision.
Data Source
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AI summary
The invention relates to a rotary tool (10), comprising: a tool main body (60), which has a clamping section (14) and a tool head (16); an exchangeable first cutting insert (22) having at least one first cutting region (18) having a first cutting edge (20), wherein the first cutting insert (22) can be inserted into an insert groove (58) of the tool main body (60) from the front side (17) of the tool head (16) and can be fastened therein in a rotationally fixed manner; and an exchangeable second cutting insert (30), which is fastened to the tool head (16) in a position offset toward the clamping section (14) in the axial direction of the rotary tool (10) relative to the first cutting insert (22) and which has an insert main body (36) and at least one second cutting region (32) having at least one second cutting edge (34). According to the invention, the second cutting insert (30) can be fastened by means of a central position with respect to the tool head cross-section from the front side (17) of the tool head (16), wherein a fastening means (42) for the second cutting insert (30) is arranged in the insert groove (58) of the first cutting insert (22) and can be accessed from the front side (17), and the fastening means (42) is longer than the diameter of the insert main body (36), wherein the fastening means (42) has a thread (44) for screwing with the tool main body (60) in at least one region outside of the insert main body (36) in the installed state in the insert main body (36). The invention further relates to a cutting insert set and to a tool main-body set for such a rotary tool (10).