Bar-Peeling Insert Geometry for Smoother Surface Finish
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Solution Overview
Problem
Existing cutting inserts for bar-peeling operations often result in a rough surface finish on machined workpieces, particularly when dealing with materials like steels, nickel-based, titanium, and aluminum alloys.
Innovation Solution
A cutting insert design featuring a specific configuration with a first cutting edge for roughing, an intermediate cutting edge for forming, and a second cutting edge for smoothing, along with a forming wiper and coolant groove to improve surface finish and deformation hardening, while optimizing coolant flow and contact pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional cutting insert is used for bar-peeling, then the cutting operation can be performed, but the surface finish of the workpiece is too rough
Solution Approach 1:
The cutting edge is divided into three distinct segments: a first cutting edge for roughing, an intermediate cutting edge for forming, and a second cutting edge for smoothing. This segmentation allows each edge to perform a specific function, with the second cutting edge specifically dedicated to producing a smooth surface finish that would otherwise require a separate finishing operation.
Solution Approach 2:
The cutting insert is designed to perform multiple functions within a single tool: roughing, forming, and surface finishing. The multi-functional cutting edge structure enables one insert to replace what would traditionally require separate roughing and finishing tools, achieving excellent surface finish while consolidating operations.
2Manufacturing precision
If multiple cutting edges are added to improve surface finish, then machining quality improves, but the device complexity increases
Solution Approach 1:
The roughing and smoothing functions are merged into a single cutting insert structure. The first cutting edge performs roughing while the second cutting edge performs smoothing, both within the same insert. This merging eliminates the need for separate tools and reduces the number of tool changes required.
Solution Approach 2:
The cutting edge is designed with three-dimensional geometry including an intermediate cutting edge that connects the first and second cutting edges. This 3D configuration allows the tool to transition from roughing to finishing operations through controlled engagement angles and depths, adding a dimensional aspect to the cutting process.
3Manufacturing precision
If a forming wiper is added behind the second cutting edge, then surface finish and deformation hardening improve, but the device complexity increases
Solution Approach 1:
The forming wiper is positioned behind the second cutting edge to perform preliminary surface deformation and hardening immediately after the cutting operation. This preliminary action prepares the surface for optimal finish quality and provides deformation hardening in one continuous operation sequence.
Solution Approach 2:
The forming wiper utilizes the workpiece material itself to deform and harden the surface through controlled plastic deformation. The wiper geometry is designed to self-regulate the deformation process, applying pressure to achieve surface hardening without requiring additional external systems or complex control mechanisms.
4Reliability
If a coolant groove is positioned between the second cutting edge and forming wiper, then coolant distribution and lubrication improve, but the device complexity increases
Solution Approach 1:
The coolant groove acts as an intermediary channel that directs coolant flow to the critical interface between the second cutting edge and the workpiece, and between the forming wiper and the workpiece. This intermediary structure ensures proper coolant distribution to areas that would otherwise be difficult to reach, improving cooling and lubrication effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves a smoother and glossy surface finish by effectively removing asperities and irregularities, deformation hardening the surface, and enhancing coolant distribution, leading to improved machining efficiency and quality.
Implementation Method 1
The first cutting edge is the cutting edge that first comes into contact with the workpiece and thus acts as a roughing edge to remove the biggest asperities on the workpiece
Implementation Method 2
The intermediate cutting edge preferably has a curved shape in a top view from the upper end surface and is the cutting edge that gives the workpiece its main form and can thus be seen as the main cutting edge
Implementation Method 3
The second cutting edge functions as a smoothing or finishing edge to further remove asperities and irregularities from the workpiece
Implementation Method 4
The forming wiper positioned behind the second cutting edge will plastically deform the remaining surface asperities to give the workpiece its desired quality with a smooth and glossy surface finish
Implementation Method 5
The deformation of the surface asperities by the forming wiper will also deformation harden the surface which in many applications is desired
Implementation Method 6
The coolant groove positioned between the second cutting edge and the forming wiper, i.e. in front of the forming wiper, will direct coolant used in the process to the workpiece to cool and lubricate the workpiece before being machined by the forming wiper
Implementation Method 7
The coolant groove positioned between the second cutting edge and the forming wiper, i.e. in front of the forming wiper, will direct coolant used in the process to the workpiece to cool and lubricate the workpiece before being machined by the forming wiper
Data Source
Figure 1
Figure 2a~2c
Figure 3a~3d
AI summary
A cutting insert 10 for bar-peeling comprising: an upper end surface 20; a lower end surface 30; a peripheral side surface extending between the upper end surface 20 and the lower end surface 30, the peripheral side surface comprising two opposing major side surfaces 40a, 40b and two opposing minor side surfaces 50a, 50b; a cutting edge 60 formed at an intersection between one of the major side surfaces 40a and the upper end surface 20; the cutting edge 60 comprising: a first cutting edge 61 having one of its end points at one of the minor side surfaces 50a; a second cutting edge 63 forming an approximately right angle with said minor side surface 50a and an obtuse angle with the first cutting edge 61, and; an intermediate cutting edge 62 between the first cutting edge 61 and the second cutting edge 63; a forming wiper 80 formed between said major side surface 40a and the upper end surface 20, the forming wiper 80 being positioned a longer distance from said minor side surface 50a than the distance from the second cutting edge 63 to said minor side surface 50a, wherein a coolant groove 70 is formed in said major side surface 40a between the second cutting edge 63 and the forming wiper 80.