Geometry, specification, and drilling performance of a plane rake faced drill point design

2010 ◽  
Vol 224 (2) ◽  
pp. 369-378 ◽  
Author(s):  
Q Zhang ◽  
J Wang
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Rake Angle ◽  
Drilling Force ◽  
Performance Improvements ◽  
Drilling Performance ◽  
Life Tests ◽  
Drill Point ◽  
Force Reduction ◽  
Twist Drills

A study of a modified drill point design with plane rake faces is presented. The critical geometries that uniquely define the drill point design are analysed based on the international standard. The study shows that the modified drill design yields positive normal rake angle on the entire lips and point relieving in the chisel edge region. An experimental study of drilling a high tensile steel using 7–13 mm high-speed steel (HSS) drills with titanium nitride (TiN) coatings has been carried out to assess the new drill point design. It shows that the modified plane rake faced (PRF) drills can reduce the thrust force by as much as 46.9 per cent with an average of 23.8 per cent, as compared to the conventional twist drills under the corresponding cutting conditions, while the reduction in torque is also significant with the maximum of 24.9 per cent. These drilling performance improvements are comparable to those from using the multi-facet drills that were claimed as one of the most heartening drill developments in several decades for drilling force reduction, while the PRF drills can be easily sharpened using the conventional twist drill grinders. The drill-life tests amply demonstrate the superiority of the PRF drills over the conventional twist drills.

Relationship Between Alloy Composition and Tool-Life of High-Speed Steel Twist Drills

1992 ◽  
Vol 114 (4) ◽  
pp. 459-464 ◽  
Author(s):  
W. E. Henderer
Keyword(s):  
Tool Life ◽  
High Speed ◽  
Alloy Composition ◽  
High Speed Steel ◽  
Vanadium Content ◽  
The Matrix ◽  
Life Tests ◽  
And Performance ◽  
Twist Drills ◽  
The Relationship

Tool-life tests are reported which show the relationship between the alloy composition of high-speed steel twist drills and performance. Tool-life is shown to depend primarily on the composition of the matrix consisting of tempered martensite and precipitated secondary carbides. The longest tool-life was obtained from alloys with high vanadium content and low tungsten or molybdenum content. This observation is consistent with the dispersion characteristics of vanadium carbide which precipitate during tempering.

The Influence of Tool Geometric Parameters on the Reliability of Deep Cryogenic High Speed Steel Taps

2016 ◽  
Vol 693 ◽  
pp. 959-964
Author(s):  
Shao Hua Zhang ◽  
Xian Guo Yan ◽  
Hong Guo ◽  
Fei Peng ◽  
Jun Ji Li ◽  
...  
Keyword(s):  
High Speed ◽  
Cutting Tool ◽  
High Speed Steel ◽  
Rake Angle ◽  
Geometric Parameters ◽  
Type I ◽  
Machining Time ◽  
Dynamic Reliability ◽  
Type I Censoring ◽  
Life Tests

The selection of geometric parameters of cryogenic tap has a direct effect on the reliability of tools and the precision of processed workpiece. Based on nonsubstitute Type-I Censoring Life Tests, a mathematical model in dynamic reliability of cryogenic tap is built, and the change of its reliability is explored. Combined with cutting tool life expansion equation, the effects of geometric parameters on wear life are presented. The results show that of the geometric parameters, rake angle taps in its effect on reliability with the increase in machining time and impact loading action, thus the quality of rake angle should be controlled directly or indirectly so as to reduce its influence on reliability of cutting tool, which can ultimately improve the reliability of cutting tool and the precision of processed workpiece. Meanwhile, the proposed method provides a theoretical basis for improvements of the reliability of tool system.

AISI TYPE M7

Alloy Digest ◽  
1987 ◽  
Vol 36 (10) ◽  
Keyword(s):  
Tool Steel ◽  
High Speed ◽  
High Speed Steel ◽  
Heat Treating ◽  
Significant Loss ◽  
Steel Mills ◽  
Aisi Type ◽  
End Mills ◽  
The Many ◽  
Twist Drills

Abstract AISI Type M7 is a molybdenum type of high-speed steel. It is somewhat similar to AISI Type M1 tool steel but with higher percentages of carbon and vanadium to provide an improvement over AISI Type M1 in cutting characteristics without a significant loss in toughness. It is suitable for a wide variety of cutting-tool applications where improved resistance to abrasion is required. The many uses of Type M7 include twist drills, end mills, shear blades, punches, milling cutters, lathe tools, taps and reamers. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and surface treatment. Filing Code: TS-483. Producer or source: Tool steel mills. See also Alloy Digest TS-468, January 1987.

TATMO

Alloy Digest ◽  
2006 ◽  
Vol 55 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Physical Properties ◽  
High Speed ◽  
High Speed Steel ◽  
Heat Treating ◽  
General Purpose ◽  
Twist Drills

Abstract Tatmo is a general-purpose high-speed steel often used in twist drills and taps. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on wear resistance as well as forming, heat treating, and machining. Filing Code: TS-633. Producer or source: Timken Latrobe Steel.

BÖHLER S705

Alloy Digest ◽  
2019 ◽  
Vol 68 (9) ◽  
Keyword(s):  
Physical Properties ◽  
High Speed ◽  
Cold Work ◽  
High Speed Steel ◽  
Heat Treating ◽  
Twist Drills

Abstract Böhler (or Boehler) S705 is a cobalt alloyed, tungsten-molybdenum high-speed steel. Applications include turning and planing tools of all types, milling cutters,taps, twist drills, woodworking tools, and cold work tools. See also Alloy Digest TS-761, April 2019. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on heat treating and machining. Filing Code: TS-776. Producer or source: Voestalpine BÖHLER Edelstahl GmbH & Co KG.

SEM Observations on Wear Mechanism of TiN–Coated HSS Twist Drills When Drilling Mild Steel

2012 ◽  
Author(s):  
R. J. Talib ◽  
S. Saad ◽  
M. R. M. Toff ◽  
A. H. Hashim
Keyword(s):  
Mild Steel ◽  
Wear Mechanism ◽  
Performance Test ◽  
Steel Plate ◽  
High Speed Steel ◽  
Depth Of Cut ◽  
Twist Drill ◽  
Drilling Performance ◽  
Thermal Wear ◽  
Twist Drills

Dalam kajian ini, haus mekanikal Keluli Laju Tinggi (KLT) telah dikaji dengan menjalankan ujian prestasi gerudi ke atas bahan kerja diperbuat daripada keluli lembut. Salutan TiN ke atas HSS twist drills diperolehi dengan menggunakan kaedah bertindak balas frekuensi radio pemercitan magnetron yang mana dibangunkan secara dalaman. Ujian prestasi gerudi dijalankan pada kelajuan pusingan 1,600 psm, kadar suapan 20 mm/minit dengan kedalaman penggerudian 25 mm. Perubahan morfologi permukaan haus diperhatikan dengan menggunakan kaedah Kemikroskopan Imbasan Elektron (KEI). Keputusan morfologi menunjukkan mekanisme rekatan dan haba beroperasi semasa proses penggerudian. Kertas kerja ini juga akan membincangkan secara mendalam proses penjanaan mekanisme haus rekatan dan haba semasa penggerudian gerudi piuhan ke atas plat keluli lembut. Keputusan ujian prestasi gerudi menunjukkan salutan TiN terendap ke atas KLT gerudi piuhan telah meningkatkan umur gerudi melebihi dua kali ganda jika dibandingkan dengan gerudi yang tidak bersalut. Kata kunci: Gerudi KLT, KEI, mekanisme haus, rekatan, haba In this study, High Speed Steel (HSS) twist drills were investigated for mechanical wear by performing drilling test on the work piece of mild steel plate. TiN coatings onto the HSS twist drills were achieved by employing reactive radio frequency (r.f) magnetron sputtering technique, which was developed in–house. The drilling performance tests were set at a rotation speed of 1,600 rpm, feed rate of 20 mm/min, and depth of cut of 25 mm. The morphological changes of the wear surface were observed using Scanning Electron Microscopy (SEM). Results of morphological examination showed that the failure mechanisms in operation during drilling were found to be adhesive and thermal wear mechanism. This paper will also discuss explicitly the processes of adhesive and thermal wear mechanism generated during drilling of twist drill on mild steel plate. Results of drilling performance test showed that the TiN coating deposited on the HSS twist drill had improved drill life by more than 2 times as compared with uncoated drill. Key words: HSS drill, SEM, wear mechanism, adhesive, thermal

New Experiments on the Temperature Distribution in Drilling

1984 ◽  
Vol 106 (3) ◽  
pp. 242-247 ◽  
Author(s):  
A. Thangaraj ◽  
P. K. Wright ◽  
M. Nissle
Keyword(s):  
Temperature Distribution ◽  
High Speed ◽  
Metal Flow ◽  
High Speed Steel ◽  
Twist Drill ◽  
Temperature Distributions ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
1045 Steel ◽  
Twist Drills

Using metallographic and microhardness techniques, temperature distributions have been determined in twist drills. The methods rely on the fact that certain high speed steel materials exhibit microstructural changes when subjected to temperatures greater than 600°C. Quick-stop specimens have also been obtained to study the metal flow patterns over the drill flutes. These results have been used to comment on the different wear mechanisms that affect the performance of a twist drill. Preliminary results show that bulk plastic flow occurs near the margin of the drill where the temperatures are in the vicinity of 900°C when machining AISI 1045 steel at 40 m/min.

Research on Cutting Performance of Graphite-Like Carbon Coated Tools in Dry Drilling of Ferrous Metal

2010 ◽  
Vol 455 ◽  
pp. 467-471
Author(s):  
Ji Ming Xiao ◽  
Yan Li ◽  
L.J. Bai ◽  
Qi Long Yuan ◽  
Jian Ming Zheng
Keyword(s):  
High Speed ◽  
Ferrous Metal ◽  
High Speed Steel ◽  
High Hardness ◽  
Cutting Performance ◽  
Low Friction ◽  
Dry Cutting ◽  
Coated Tools ◽  
Carbon Coated ◽  
Twist Drills

The graphite-like carbon (GLC) coating was deposited onto high-speed steel (HSS) twist drills by magnetron sputter ion plating technique. The drilling tests were performed on the ferrous metal under dry cutting conditions. By the analysis and comparison of the flank wear and the drilling forces on drills, the cutting performance of GLC coated HSS tools was researched. The results show that GLC coating with high hardness and low friction coefficient, due to its good adhesion and match with HSS substrate, can significantly improve the cutting performance of HSS twist drills, prolong the tool life, decrease the drilling forces in drilling the ferrous metal. And its cutting performance is better than the hard coated drills in the lower speed, but its thermal stability is inferior to the hard coated drills in the higher speed.

scholarly journals Analysis of cutting conditions in the process of cross-cutting wood by circular saws

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 1029-1041
Author(s):  
Ján Kováč ◽  
Pavol Harvánek ◽  
Jozef Krilek ◽  
Tomáš Kuvik ◽  
Ján Melicherčík
Keyword(s):  
Wood Species ◽  
High Speed ◽  
Cutting Speed ◽  
High Speed Steel ◽  
Rake Angle ◽  
Cutting Conditions ◽  
Sintered Carbide ◽  
Circular Saw ◽  
Saw Blade ◽  
Circular Saws

An analysis was conducted of the effects of cutting conditions in the cross-cutting of wood using circular saws. Gradual wear of the saw blade cutting wedges impacted the entire cutting process. Two different types of circular saw blades were used. One blade type featured sintered carbide tips and 54 saw blade teeth, whereas the other had high-speed steel with 56 teeth; both saw-blades were 600 mm in diameter with a rake angle of 20°. The two wood species were spruce (Picea abies) and beech (Fagus sylvatica). During sawing, the timber was fed at a velocity of vf = 6 and 12 m·min-1. The cutting speed (vc) was set at 60 m·s-1, 70 m·s-1 and 80 m·s-1. The saw blades were coated with three types of PVD coatings. The least energy intensive saw blade was a sintered carbide-free saw blade with a coating (AlTiN) at a displacement speed of 12 m·min-1 and cutting speed of 60 m·s-1 with a power of 1310,63 W. Any change of a saw blade considerably affected torque for all the wood species, so a particular type of saw blade will always have an impact on torque. Other parameters distinctively and individually influenced the process of wood sawing.

GUTERL M-1

Alloy Digest ◽  
1981 ◽  
Vol 30 (12) ◽  
Keyword(s):  
Physical Properties ◽  
Surface Treatment ◽  
High Speed ◽  
High Speed Steel ◽  
Heat Treating ◽  
General Purpose ◽  
Heavy Duty ◽  
Red Hardness ◽  
Circular Saws ◽  
Twist Drills

Abstract GUTERL M-1 is a highly-molybdenum, low-tungsten type of high-speed tool steel. It is a general-purpose high-speed steel with an excellent combination of cutting ability, finishing characteristics and toughness. Guterl M-1 has good cutting ability for all operations except for heavy-duty, continuous cutting applications that require the ultimate in red hardness. Its toughness is as great as that of other high-speed steels. Its typical uses include circular saws, broaches, gear cutters, twist drills and taps. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: TS-391. Producer or source: Guterl Special Steel Corporation.

Sign in / Sign up

Export Citation Format

Share Document