Unified Mathematic and Geometric Model of Cutting Edge Separation with Corner Radius in Turning

2020 ◽  
pp. 10-21
Author(s):  
Storch Borys ◽  
Żurawski Łukasz
Keyword(s):  
Geometric Model ◽  
Cutting Edge ◽  
Corner Radius ◽  
Edge Separation

scholarly journals Machining of Inserts with PCD Cutting-Edge Technology and Determination of Optimum Machining Conditions Based on Roundness Deviation and Chip-Cross Section of AW 5083 AL-Alloy Verified with Grey Relation Analysis

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1485
Author(s):  
Martin Miškiv-Pavlík ◽  
Jozef Jurko
Keyword(s):  
Cross Section ◽  
Feed Rate ◽  
Electrical Discharge Machining ◽  
Cutting Speed ◽  
Polycrystalline Diamond ◽  
Cutting Edge ◽  
Depth Of Cut ◽  
Al Alloy ◽  
Corner Radius ◽  
Grey Relational

This paper describes the important significance of cutting-edge technology in the machining of polycrystalline diamond (PCD) cutting inserts by comparing the evaluation criteria. The LASER technology of cutting-edge machining is compared with grinding and electrical discharge machining (EDM) technologies. To evaluate the data from the experiments, the Grey Relational Analysis (GRA) method was used to optimize the input factors of turning to achieve the required output parameters, namely the deviation of roundness and chip cross-section. The input factors of cutting speed, feed rate, depth of cut and corner radius were applied in the experiment for three different levels (minimum, medium and maximum). The optimal input factors for turning of aluminum alloy (AW 5083) were determined for the factorial plan according to Grey Relational Grade based on the GRA method for the multi-criteria of the output parameters. The results were confirmed by a verification test according to the GRA method and optimal values of input factors were recommended for the machining of Al-alloy (AW 5083) products. This material is currently being developed by engineers for forming selected components for the automotive and railway industries, mainly to reduce weight and energy costs. The best values of the output parameters were obtained at a cutting speed of 870 m/min, feed rate of 0.1 mm/min, depth of cut of 0.5 mm and a corner radius of 1.2 mm.

scholarly journals Research on the stages of the wear of the tip cutting edge with a rounding radius based on the mathematical and geometric model

Mechanik ◽  
2019 ◽  
Vol 92 (11) ◽  
pp. 704-706
Author(s):  
Borys Storch ◽  
Łukasz Żurawski
Keyword(s):  
Geometric Model ◽  
Cutting Tools ◽  
Cutting Edge ◽  
Wear Model ◽  
Machined Surface ◽  
Edge Wear

In modern multiuse cutting tools with exchange plate (e.g. with superfinishing edge or Wiper), the cutting edge is made without documenting the basis for optimizing its dimensions. The article presents a generalized edge wear model surrounded by a rounded tip. The proposed solution allows such a modification of edge corner – by determining the conditions of its work – to adapt the tool to stabilize the process of shaping the machined surface.

A comprehensive engineering model for the design, manufacture and assembly of helical carpenter shapers

2002 ◽  
Vol 216 (11) ◽  
pp. 1493-1504 ◽  
Author(s):  
W-F Chen ◽  
H-Y Lai
Keyword(s):  
Geometric Model ◽  
Cutting Edge ◽  
Cutting Process ◽  
Surface Model ◽  
Engineering Model ◽  
Continuous Curve ◽  
Noise Levels ◽  
Cutting Efficiency ◽  
Helical Surface ◽  
Modelling Approach

Currently, straight cutting-edge carpenter shapers are widely used in the production process. The manner of contact between this traditional type of shaper and the workpiece is a piecewise continuous curve. One drawback of shapers of this type is that the noise generated during the cutting process tends to be very loud. In order to overcome this problem, the current paper takes the thickness of the cutter into account and employs the concept of equidistant lines and surfaces to develop a new carpenter shaper that comprises a helical cutting edge on a cylindrical shank surface. The geometric shape of the blade surface that is mounted in the groove of the cutter shank is first derived. The contact curve of the proposed carpenter shaper with the workpiece is shown to be continuous. In order to establish a geometric model that facilitates the simple production of a carpenter helical shaping cutter, this paper presents a new design approach, which constructs an equidistant and equivalent involute helical surface model and a corresponding planar unwinding torus model. The carpenter shaper thus obtained is proven to be successful in reducing the noise levels of the cutting process. The contact style of the shaper also offers the additional advantages of higher cutting efficiency, lower energy consumption and longer tool-life. A numerical example is presented to illustrate the effectiveness of the proposed modelling approach. The results indicate that the proposed carpenter helical shaping (CHS) cutter model is accurate, efficient and comprehensive. The model is sufficiently accurate that it can be used as a guideline for the design, manufacture and assembly of robust, reliable and silent wooden shapers.

scholarly journals Study on Design, Manufacture and Cutting Performance of Circular-arc Milling Cutters for Machining Titanium Alloy

2021 ◽  
Author(s):  
Tao Chen ◽  
Liu Gang ◽  
Li Rui ◽  
Lu Yujiang ◽  
Wang Guangyue
Keyword(s):  
Titanium Alloy ◽  
Surface Quality ◽  
End Milling ◽  
Geometric Model ◽  
Cutting Edge ◽  
Grinding Wheel ◽  
Side Milling ◽  
Edge Structure ◽  
Circular Arc ◽  
Milling Forces

Abstract Titanium alloy is widely used for manufacturing structural parts of high-end equipment due to its excellent mechanical properties, despite difficulty in being machined. Nowadays, titanium alloy parts are mostly machined by ball-end milling cutters (BEMC), but the cutting edge structure of the BEMC limits the improvement in machining efficiency and surface quality of the parts. In this paper, a circular-arc milling cutter (CAMC) with large-curvature cutting edge was proposed; the differential geometry method was used for establishing the geometric model for the contour surface of the CAMC and the mathematical model for the spiral cutting edge line; the conversion matrix between grinding wheel and workpiece coordinates was introduced to derive the equation of grinding wheel trajectory when the rake face of the CAMC was ground; the self-designed CAMC was ground and tested in accuracy. The comparative research was conducted experimentally on the side milling of titanium alloy TC4 with the CAMC and BEMC, and consequently the variation laws of milling forces, wear morphology and machined surface quality were obtained about the two types of milling cutters. The results indicated that the CAMC can effectively reduce the main milling force and keep the milling process stable. Moreover, the CAMC was worn slower and produced better surface quality than the BEMC.

Modeling the cutting edge geometry of scalpel blades

2016 ◽  
Vol 231 (1) ◽  
pp. 65-72 ◽  
Author(s):  
Pralav P Shetty ◽  
Ryan W Hatton ◽  
Andrew C Barnett ◽  
Andrew J Homich ◽  
Jason Z Moore
Keyword(s):  
Steady State ◽  
Cutting Force ◽  
Contact Area ◽  
Cutting Forces ◽  
Geometric Model ◽  
Cutting Edge ◽  
Medical Procedures ◽  
Edge Geometry ◽  
Edge Surface ◽  
Scalpel Blade

Scalpel blades are commonly used in surgery to perform invasive medical procedures, yet there has been limited research on the geometry that makes up these cutting instruments. The goal of this article is to define scalpel blade geometry and examine the cutting forces and deflection between commonly used scalpel blades and phantom gel. The following study develops a generalized geometric model that describes the cutting edge geometry in terms of normal rake and inclination angle of any continuously differentiable scalpel cutting edge surface. The parameter of scalpel-tissue contact area is also examined. The geometry of commonly used scalpel blades (10, 11, 12, and 15) is compared to each other and their cutting force through phantom gel measured. It was found that blade 10 displayed the lowest average total steady-state cutting force of 0.52 N followed by blade 15, 11, and 12 with a cutting force of 1.17 N (125% higher than blade 10). Blade 10 also displayed the lowest normalized cutting force of 0.16 N/mm followed by blades 15, 12, and 11 with a force of 0.19 N/mm (17% higher than blade 10).

The Finite Element Analysis of the Stress and Deformation of the Micro-Milling Cutter Based on ANSYS

2014 ◽  
Vol 494-495 ◽  
pp. 345-348 ◽  
Author(s):  
Xin Xin Wang ◽  
Xiao Hong Lu ◽  
Guang Hao Xu ◽  
Feng Chen Wang
Keyword(s):  
Finite Element ◽  
Geometric Model ◽  
Element Model ◽  
Cutting Edge ◽  
Micro Milling ◽  
Element Analysis ◽  
Milling Cutter ◽  
Finite Element Software ◽  
Extended Length ◽  
Stress And Deformation

Because of the differences in spindle speed and extended length of micro milling cutter, Tool life and machining surface quality vary markedly. Therefore, a geometric model of carbide end mill whose diameter is 0.2mm is built. With free meshing method, meshing density is set up reasonably, which ensure the rationality of the built finite element model. On the premise of considering the extended length of the micro milling cutter, apply linear load on the main cutting edge and front-cutting edge, carry out the deformation and stress analysis using finite element software. Applying different spindle speeds under four extended lengths, through comparing maximum stress and strain under four extended lengths, change rules are summarized and the extended lengths of the tool suited for micro-milling are achieved.

Effects of Tool Nose Corner Radius and Main Cutting-Edge Radius on Cutting Temperature in Micro-Milling Inconel 718 Process

2017 ◽  
Author(s):  
Xiaohong Lu ◽  
Hua Wang ◽  
Zhenyuan Jia ◽  
Likun Si ◽  
Steven Y. Liang
Keyword(s):  
Three Dimensional ◽  
Cutting Temperature ◽  
Milling Process ◽  
Cutting Edge ◽  
Micro Milling ◽  
Milling Cutter ◽  
Micro Scale ◽  
Cutting Edge Radius ◽  
Corner Radius ◽  
Edge Radius

Cutting temperature plays an important role in micro-scale cutting process because the dimension of the micro-milling cutter is relatively small and the wear of micro-milling cutter is sensitive to temperature. Considering the sidewall of a groove is formed by main cutting edge of the tool, and the bottom of a groove is formed by tool tip and the edge on the end of the tool. Therefore, effects of tool nose corner radius and main cutting edge radius on cutting temperature in micro-milling process cannot be ignored. However, few studies have been conducted on this issue. The effects of tool nose corner radius and main cutting edge radius on cutting temperature is investigated. A three-dimensional micro-milling Inconel718 model is established by using the software DEFORM3D. And the influence of tool nose corner radius and main cutting edge radius on the size and distribution of cutting temperature are studied by numerical simulation, which is verified by experiments. The work provide reference for the control of the size and distribution of the cutting temperature during micro-milling process.

Plastic Deformation in Microtomed Sections

1971 ◽  
Vol 29 ◽  
pp. 458-459
Author(s):  
J. Temple Black
Keyword(s):  
Plastic Deformation ◽  
Plastic Strain ◽  
Applied Stress ◽  
Elastic Strain ◽  
High Strain ◽  
Tool Material ◽  
Cutting Edge ◽  
Material Structure ◽  
Geometrical Constraints

The output of the ultramicrotomy process with its high strain levels is dependent upon the input, ie., the nature of the material being machined. Apart from the geometrical constraints offered by the rake and clearance faces of the tool, each material is free to deform in whatever manner necessary to satisfy its material structure and interatomic constraints. Noncrystalline materials appear to survive the process undamaged when observed in the TEM. As has been demonstrated however microtomed plastics do in fact suffer damage to the top and bottom surfaces of the section regardless of the sharpness of the cutting edge or the tool material. The energy required to seperate the section from the block is not easily propogated through the section because the material is amorphous in nature and has no preferred crystalline planes upon which defects can move large distances to relieve the applied stress. Thus, the cutting stresses are supported elastically in the internal or bulk and plastically in the surfaces. The elastic strain can be recovered while the plastic strain is not reversible and will remain in the section after cutting is complete.

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