Chip curling in metal cutting

Emelyanov, Sergey; Yatsun, E. I.; Remnev, A. I.; Shvets, Stanislav Volodymyrovych

doi:10.3103/s1068798x11060086

Cited by 6 publications

(7 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, the influence of each of the angles of rotation on the final value of the static angles of the selected indexed insert (with known geometry in the instrument coordinate system) can be determined using formulas (7)- (10).…”

Section: Methodsmentioning

confidence: 99%

“…Formulas for discrete geometric analysis of indexed insert tools have been proposed [8]. Their use makes it possible to determine the geometry of indexable inserts in a static coordinate system and thus improve the design of tools because the blades' geometrical parameters affect the quality of processing and stability of the tool [9], chip curling and shredding [10].…”

Section: Literature Reviewmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Insert Angles on Cutting Tool Geometry

Shvets

Astakhov²

2020

JES

Self Cite

View full text Add to dashboard Cite

An analysis of publications has shown that mechanically clamped indexable inserts are predominantly used in modern tool manufacturing. Each insert has its shape and geometry in the tool coordinate system. The static system’s required geometry is achieved by the tilting of the insert pocket in the radial and axial directions. Therefore, it is of great importance in the tool design to know the relationships between the insert’s geometry parameters in the tool coordinate system where the geometry paraments of the insert are defined and working geometry parameters of the tool defined in the static coordinate system. The paper presents the developed methodology for determining the insert pocket base surface position to ensure the required values of the tool geometry parameters of the selected indexable insert in the static coordinate system. The graphs of the dependence of each of the angles of the insert geometry on the angles of rotation of this insert in the front and profile planes are presented as the level lines for practical use. Using these graphs, one can optimize all geometric insertion parameters in the static coordinate system. The model of the calculations of the mechanism of the insert clamping by a screw is developed. The basic size and tolerance of the output link determine the distance from the intersection line of the base surfaces to the thread axis on the pocket and the minimum amount of the screw stroke on the insert clamping in the pocket. Keywords: indexable insert, cutting tool, coordinate system, base surfaces, geometric parameters.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Effect of Insert Angles on Cutting Tool Geometry

Shvets

Astakhov²

2020

JES

Self Cite

View full text Add to dashboard Cite

show abstract

“…In general, chip dimensions depend on cutting conditions, as exposed by Emel'yanov et al [26] and Liu et al [27]. In this section, the effect of the pulsed current on chip shape and dimensions is studied.…”

Section: 3-chip Dimensionsmentioning

confidence: 96%

Effect of Electropulses on the Machinability of a C45e Steel

Montaña

Echeverri

Rojas

2019

DYNAII

View full text Add to dashboard Cite

This article compares the machinability of a C45E (AISI/SAE 1045) steel type under two different manufacturing processes: conventional machining and pulsed current assisted machining. The testing procedure consisted on the dry turning, using a coated carbide cutting tool (HM) and highspeed steel (HSS) cutting tools, under two different spindle speeds. In this study cutting tool life is evaluated in function of cutting speed for both machining conditions and both cutting tools. Results show variation on flank wear depending on the tool used and cutting speed, showing an increase in machinability when using the HM tool with the electropulse assisted turning at low cutting speed. Additionally, changes in chip type are found when assisting the process with electropulses. Statistically significant variations in chip dimensions and chip ratio are present, evidencing the differences in the phenomena affecting shear strain. Surface roughness, for its part, is improved when turning with the assistance of electropulses.

show abstract

“…However, it was unexpected that chips appeared more regular when cooling was increased further. One potential explanation might be that the increase in mass flow rate of the cryogenic medium decreases the radius of the chip curvature and the chip length, while the larger cooling effect results in higher temperature gradients and thus more pronounced bending stresses [40,41]. Nevertheless, further investigation would be required in order to fully understand the observed chip morphologies.…”

Section: Chip Morphologymentioning

confidence: 99%

Hybrid manufacturing of titanium Ti-6Al-4V combining laser metal deposition and cryogenic milling

Moritz

Seidel

Kopper

et al. 2020

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Hybrid manufacturing, which, e.g., combines additive manufacturing with conventional machining processes, can be a way of overcoming limitations currently encountered in additive manufacturing. Cryogenic milling might be a viable option for hard-tocut materials, as it leaves a contamination-free surface and can increase surface quality and tool life compared to conventional cooling concepts. In this study, the influence of cryogenic milling with carbon dioxide on titanium Ti-6Al-4V specimens manufactured with laser metal deposition (LMD) was investigated regarding tool wear and surface integrity in comparison to dry machining and machining with cooling lubricants. Moreover, additional layers of material were deposited on top of conventionally and cryogenically machined surfaces by means of LMD. The interface zone was then examined for defects. The milling process was closely monitored by means of thermal and high-speed imaging. Optical and tactile surface analysis provided evidence that lower roughness values and improved surface qualities could be obtained with cryogenic machining in comparison to dry machining. Moreover, significantly less tool wear was observed when a cryogenic cooling medium was applied. Although the utilization of conventional cooling lubricants resulted in satisfying surface qualities, substantial residual contamination on the milled surface was detected by means of fluorescence analysis. These contaminants are suspected to cause defects when the next layer of material is deposited. This is supported by the fact that pores were found in the weld bead applied on top of the milled specimens by means of LMD. Conversely, cryogenic machining resulted in very clean surfaces due to the residue-free evaporation of the coolant. Hence, a good metallurgical bonding between the weld bead and the milled substrate could be achieved. The results indicate the great potential of cryogenic milling in hybrid manufacturing, especially in terms of intermediate machining, as it provides residue-free surfaces for subsequent material deposition without an additional cleaning step and can significantly prolongate tool life.

show abstract

Chip curling in metal cutting

Cited by 6 publications

References 1 publication

Effect of Insert Angles on Cutting Tool Geometry

Effect of Insert Angles on Cutting Tool Geometry

Effect of Electropulses on the Machinability of a C45e Steel

Hybrid manufacturing of titanium Ti-6Al-4V combining laser metal deposition and cryogenic milling

Contact Info

Product

Resources

About