Parting-Off Blade Geometry to Prevent Jamming and Chip Trapping
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Solution Overview
Problem
Prior art parting off machines and blades often jam during cutting due to chip accumulation and sample deformation, leading to slowed and incomplete cutting processes.
Innovation Solution
A parting off blade with increased thickness in the direction opposite to the free front end, featuring a first cutting insert and a second cutting insert with greater thickness, which widens the cutting groove for chip removal and enhances blade strength, allowing for quick and clean cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a thin blade is used for cutting, then the blade can penetrate the sample more easily, but the blade section becomes the weakest part and may deflect or jam in the sample
Solution Approach 1:
The blade is designed with non-uniform thickness: the cutting insert at the free front end has a first thickness optimized for cutting, while the blade section has a second thickness greater than the first thickness, providing localized reinforcement where structural strength is needed without compromising cutting performance at the front end
2Manufacturing precision
If a thin blade is used for cutting, then the blade can be more precise, but chips are trapped between the blade and sample causing jamming
Solution Approach 1:
The blade section is designed with a second thickness greater than the first thickness of the cutting insert, creating a geometry that prevents chip accumulation. The increased thickness of the blade section relative to the cutting insert allows chips to be ejected more effectively from the cutting zone, eliminating jamming while preserving precise cutting at the front end
3Strength
If the blade section is made thicker for strength, then blade deflection is reduced, but the blade cannot penetrate the sample as easily
Solution Approach 1:
The blade exhibits a thickness gradient: the cutting insert at the free front end has a smaller first thickness that facilitates easy penetration and precise cutting, while the blade section has a larger second thickness that provides structural strength and prevents deflection. This local differentiation of thickness allows the blade to simultaneously achieve ease of penetration and structural integrity
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
A parting off blade (1) for use in combination with a parting off machine, lathe or the like, which comprises a free front end for cutting a sample (2). The cutoff blade (1) has a shape that at least partially includes an increased thickness in the direction opposite to said free front end. In a first preferred embodiment, a first cutting insert (11) is mounted at the free front end and a second cutting insert (15) is provided behind the first cutting insert (11). The second cutting insert (15) may be mounted such that it is moveable along the blade (1). In another preferred embodiment (see figure 3) a cutting insert (3) having a front part (32) with a width less than a rear part (31) is mounted at the free end of the blade (1).