Round Milling Insert Mounting With Curved Anti-Rattle Contact
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Solution Overview
Problem
Conventional cutting tools with round milling inserts often experience floating or rattling due to machining accuracy or assembly errors, causing unintended point or line contacts instead of surface contacts between the insert and the tool body.
Innovation Solution
The tool body features a mounting seat with a seating surface, a female screw hole, and a recessed portion with curved inner surfaces that gradually decrease in distance, allowing specific protrusions on the round milling insert to fit and maintain contact at predetermined areas, preventing floating or rattling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the side faces of the protrusion and recessed portion are designed to contact each other, then the round milling insert should be stably fixed, but machining accuracy or assembly errors cause unintended point or line contact instead of surface contact, leading to floating or rattling
Solution Approach 1:
The patent applies curvature to the contact surfaces by forming both the inner surfaces of the recessed portion and the outer surfaces of the protrusion as curved surfaces. This curvature design ensures that the contact area between the protrusion and recessed portion is always a surface contact rather than point or line contact, even when there are machining accuracy deviations or assembly errors. The curved surfaces automatically adapt to each other, maintaining stable fixation and preventing floating or rattling of the round milling insert.
2Reliability
If curved surfaces are formed on the recessed portion, then contact area is increased and stability is improved, but manufacturing complexity increases
Solution Approach 1:
The recessed portion is formed with curved inner surfaces that are rotationally symmetric about the insertion direction axis. This rotational symmetry allows the curved surfaces to be manufactured using standard CNC machining operations, such as boring or milling with rotational motion, making the manufacturing process relatively simple despite the curved geometry. The curvature is consistent around the axis, reducing the complexity compared to asymmetric curved surfaces.
Data Source
Figure 1
Figure 2(A)~2(B)
Figure 3(A)~3(B)
AI summary
Provided are a tool body (200) and a round indexable milling insert (300) that together form a cutting tool (100). The tool body (200) and the cutting insert (300) are configured not to cause floating or rattling when the round milling insert (300) is mounted, by keeping the contact part between the round milling insert (300) and the tool body (200) at a predetermined part. The tool body includes a recessed portion (220) provided on a mounting seat of the tool body, wherein the recessed portion (220) has both inner surfaces (221, 222) formed as curved surfaces in such a manner that the distance (D2, fig. 7) between the surfaces (221,222) gradually decreases with increasing depth. The round milling insert (300) includes a plurality of protrusions (350) formed so as to protrude in the radial direction, any of the plurality of protrusions being able to be fitted into the recessed portion (220) , wherein each of the protrusions (350) has both outer surfaces (351,352) formed of curved surfaces in such a manner that the distance (D3) between the surfaces gradually decreases toward a tip of the protrusion (350). The curved surfaces (351, 352,221, 222) of the protrusion (350) and the recessed portion (220) are formed at the contact area between the protrusion (350) and the recessed portion (220).