Cemented Carbide Insert With Countersunk Hard Inset
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Solution Overview
Problem
Existing cemented carbide inserts require costly and time-consuming grinding processes, especially when incorporating hard insets like CBN, which demand precise machining and often result in unnecessary energy and time consumption due to the need for grinding large cemented carbide surfaces for chip and clearance surfaces.
Innovation Solution
A cemented carbide insert design featuring wedge-shaped heads and a tapering intermediate body, where the hard inset is countersunk and only the short head is ground, minimizing the grinding area to the inset and surrounding cemented carbide, allowing for precise positioning and reduced grinding needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If large cemented carbide surfaces are ground to ensure precise positioning of the cutting edge, then manufacturing precision is improved, but manufacturing cost and time consumption increase
Solution Approach 1:
The patent applies local quality by making only the head portion of the insert (containing the cutting edge) ground, while the body remains unground. This localized grinding approach focuses precision machining only where it is functionally necessary - at the cutting edge area - thereby reducing overall grinding time and cost while maintaining the required positioning accuracy of the cutting edge relative to the support points.
2Manufacturing precision
If the entire insert is ground to ensure precise spatial positioning of the cutting edge, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements local quality by restricting ground surfaces to only the head portion containing the cutting edge, while leaving the body unground. This selective grinding approach ensures the cutting edge achieves precise spatial positioning relative to support points without incurring the high costs associated with grinding the entire insert, thus resolving the contradiction between manufacturing precision and manufacturing cost.
3Manufacturing precision
If large areas of cemented carbide are ground to accommodate hard insets, then manufacturing precision is improved, but energy consumption increases
Solution Approach 1:
The patent applies local quality by limiting grinding operations to the head portion of the insert where the cutting edge and hard insets are located. This localized approach ensures precise positioning accuracy is achieved in the critical cutting area while minimizing the total energy consumption of grinding operations, as energy-intensive grinding is performed only on the small head area rather than the entire insert.
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The invention relates to a cemented carbide insert intended for chip removing machining, in particular turning, which comprises an upper side (1), an under side (2), and a number of side surfaces extending between the same, as well as a cutting edge (3a, 3b), which includes a nose edge (5) and two main edges (4) converging toward the same and is included in an inset (14), which consists of a material that is harder than the cemented carbide, and which is countersunk in the surrounding cemented carbide and co-ground with the same. The inset (14) is arranged in a front, wedge-shaped head (7), which is delimited by one chip surface (71) and two clearance surfaces (72) running along the main edges (4), as well as transforms into a postjacent body part (8) via limiting surfaces (81, 82) situated inside imaginary planes in the extension of said chip and clearance surfaces (71, 72). By placing the inset in such a head, the requisite grinding is reduced to a minimum. In addition, the invention relates to a blank for the manufacture of cutting inserts of the kind in question.