scholarly journals Peculiarities Regarding the Smooth Entrance of the Drill in Cutting When Processing Steel

2020 ◽  
Vol 21 (2) ◽  
pp. 83-88
Keyword(s):  
Axial Force ◽  
High Speed ◽  
Cutting Tool ◽  
Active Element ◽  
High Speed Steel ◽  
Cutting Process ◽  
Small Range ◽  
Helical Spring ◽  
The Way

Metal drilling is one of the most common methods of obtaining cylindrical bores. At the same time, the drill is the cutting tool that cuts in the most difficult conditions and consequently any measure that leads to the improvement of the cutting process is useful. The smooth entrance in the cutting is a way to increase the durability of the drill and consequently specific devices have been developed. One of these devices is shown in this paper and previous research shows the effectiveness of its use in drilling. The analysis of the device shows that it is used for cutting 41MoC11 and C45 steels with high speed steel drills, which are in a small range of sizes. The active element of the device is identified, a helical spring working for compression, and by calculating the respective axial force of the torque, is determined exactly the range of diameters of the drills that can cut effectively. At the same time is analyzed the way of enlarging the range of drills used with the device for smooth entrance in cutting, by introducing a second spring, concentric with the first, and which works simultaneously with it, thus the device was reengineered.

Fatigue Fracture Investigation of Cemented Carbide Tools in Gear Hobbing, Part 1: FEM Modeling of Fly Hobbing and Computational Interpretation of Experimental Results

2002 ◽  
Vol 124 (4) ◽  
pp. 784-791 ◽  
Author(s):  
A. Antoniadis ◽  
N. Vidakis ◽  
N. Bilalis
Keyword(s):  
High Speed ◽  
Cutting Tool ◽  
Complex Geometry ◽  
High Speed Steel ◽  
Cutting Performance ◽  
Cutting Process ◽  
Cemented Carbide ◽  
Fem Modeling ◽  
Gear Hobbing ◽  
Cemented Carbide Tools

Gear hobbing is a highly utilized flexible manufacturing process for massive production of external gears. However, the complex geometry of cutting hobs is responsible for the almost exclusive utilization of high-speed steel (HSS) as cutting tool material. The limited cutting performance of HSS, even coated HSS, restricts the application of high cutting speeds and restricts the full exploitation of modern CNC hobbing machine tools. The application of cemented carbide tools was considered as a potential alternative to modern production requirements. In former investigations an experimental variation of gear hobbing, the so-called fly hobbing was applied, in order to specify the cutting performance of cemented carbide tools in gear production. These thorough experiments indicated that cracks, which were not expected, might occur in specific cutting cases, leading to the early failure of the entire cutting tool. In order to interpret computationally the reasons for these failures, an FEM simulation of the cutting process was developed, supported by advanced software tools able to determine the chip formation and the cutting forces during gear hobbing. The computational results explain sufficiently the failure mechanisms and they are quite in line with the experimental findings. The first part of this paper applies the verified parametric FEM model for various cutting cases, indicating the most risky cutting teeth with respect to their fatigue danger. In a step forward, the second part of the paper illustrates the effect of various technological and geometric parameters to the expected tool life. Therefore, the optimization of the cutting process is enabled, through the proper selection of cutting parameters, which can eliminate the failure danger of cemented carbide cutting tools, thus achieving satisfactory cost effectiveness.

TATMO V-N

Alloy Digest ◽  
1985 ◽  
Vol 34 (12) ◽  
Keyword(s):  
High Speed ◽  
Cutting Tool ◽  
High Speed Steel ◽  
High Hardness ◽  
Heat Treating ◽  
Nitrogen Addition ◽  
Aisi Type ◽  
End Mills ◽  
Red Hardness ◽  
Edge Toughness

Abstract TATMO V-N is an AISI Type M7 high-speed steel modified by alloy balancing and a nitrogen addition to develop superior hardness response in heat treatment. It is an excellent grade for many cutting-tool applications requiring an optimum balance of red hardness, edge toughness and wear resistance, such as drills, taps, end mills, reamers and milling cutters. Its combination of outstanding properties and high hardness makes Tatmo V-N a logical alternate for cobalt high-speed steels in many cutting-tool applications. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, machining, and surface treatment. Filing Code: TS-452. Producer or source: Latrobe Steel Company.

scholarly journals Stability analysis for a single-point cutting tool deflection in turning operation

2019 ◽  
Vol 11 (6) ◽  
pp. 168781401985318
Author(s):  
Amon Gasagara ◽  
Wuyin Jin ◽  
Angelique Uwimbabazi
Keyword(s):  
Cutting Forces ◽  
High Speed ◽  
Cutting Tool ◽  
Single Point ◽  
Three Dimensional ◽  
High Speed Steel ◽  
Cutting Parameters ◽  
Depth Of Cut ◽  
Beam Model ◽  
Tool Deflection

In this article, a new model of regenerative vibrations due to the deflection of the cutting tool in turning is proposed. The previous study reported chatter as a result of cutting a wavy surface of the previous cut. The proposed model takes into account cutting forces as the main factor of tool deflection. A cantilever beam model is used to establish a numerical model of the tool deflection. Three-dimensional finite element method is used to estimate the tool permissible deflection under the action of the cutting load. To analyze the system dynamic behavior, 1-degree-of-freedom model is used. MATLAB is used to compute the system time series from the initial value using fourth-order Runge–Kutta numerical integration. A straight hard turning with minimal fluid application experiment is used to obtain cutting forces under stable and chatter conditions. A single-point cutting tool made from high-speed steel is used for cutting. Experiment results showed that for the cutting parameters above 0.1mm/rev feed and [Formula: see text]mm depth of cut, the system develops fluctuations and higher chatter vibration frequency. Dynamic model vibration results showed that the cutting tool deflection induces chatter vibrations which transit from periodic, quasi-periodic, and chaotic type.

Fatigue behavior of two notched cutting tool materials – High speed steel and cemented carbide

2020 ◽  
Vol 62 (3) ◽  
pp. 265-270
Author(s):  
Zainul Huda ◽  
Muhammad Hani Ajani ◽  
Muhammad Saad Ahmed
Keyword(s):  
High Speed ◽  
Cutting Tool ◽  
Fatigue Behavior ◽  
High Speed Steel ◽  
Cemented Carbide ◽  
Tool Materials ◽  
Cutting Tool Materials

AISI TYPE M33

Alloy Digest ◽  
1982 ◽  
Vol 31 (8) ◽  
Keyword(s):  
High Speed ◽  
Cutting Tool ◽  
High Speed Steel ◽  
Heat Treating ◽  
Heavy Duty ◽  
Steel Mills ◽  
Aisi Type ◽  
Heat Treated ◽  
Aircraft Alloys ◽  
Red Hardness

Abstract AISI Type M33 is a heavy-duty high-speed steel; it contains 8.00% cobalt to improved red hardness. It is recommended for cutting-tool applications in which wear resistance and high temperature hardness are important characteristics. It should not be used where excessive shock and/or chatter are encountered. AISI Type M33 is well suited to uses such as machining hard and heat-treated materials and machining both ferrous and nonferrous aircraft alloys. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-402. Producer or source: Tool steel mills.

AL TECH SUPER LMW-EXTRA

Alloy Digest ◽  
1981 ◽  
Vol 30 (10) ◽  
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Cutting Tool ◽  
High Speed Steel ◽  
Heat Treating ◽  
Temperature Performance ◽  
Heat Treated ◽  
Aircraft Alloys ◽  
Red Hardness ◽  
Specialty Steel

Abstract AL Tech Super LMW-Extra is high-molybdenum high-speed steel containing 8.25% cobalt to improved red hardness. It is most useful for cutting-tool applications in which wear resistance and high-temperature hardness are important properties. This grade should not be use where excessive shock or chatter are encountered. Super LMW-Extra is well suited to applications such as machining hard and heat-treated materials and machining both ferrous and nonferrous aircraft alloys. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on high temperature performance as well as heat treating and machining. Filing Code: TS-388. Producer or source: AL Tech Specialty Steel Corporation.

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