Extending tool life in buttress-thread cutting on high-strength blanks

2015 ◽  
Vol 35 (12) ◽  
pp. 953-956 ◽  
Author(s):  
A. S. Yamnikov ◽  
A. O. Chuprikov ◽  
A. I. Khar’kov
Keyword(s):  
Tool Life ◽  
High Strength ◽  
Thread Cutting

Influence of the choice of wear criterion on the life of high speed machine manual taps

2020 ◽  
pp. 74-78
Author(s):  
A.E. Dreval
Keyword(s):  
Service Life ◽  
Structural Steel ◽  
Tool Life ◽  
High Speed ◽  
High Speed Steel ◽  
Parameter Dependence ◽  
Limiting State ◽  
Thread Cutting ◽  
Failure Life ◽  
High Speed Machine

The assessment of the limiting state of high-speed machine-manual taps in the processing of structural steel billets is considered. A general multi-parameter dependence is developed for calculating the criterion of allowable wear, which makes it possible to rationally use the tool life and normalize the cut amount during regrinding. Keywords thread cutting, tap, angle of the cutting part, criterion, high-speed steel, wear, failure, life, service life. [email protected]

Effect of plasma preheating on weld quality and tool life during friction stir welding of DH36 steel

2021 ◽  
pp. 095440542199013
Author(s):  
Avinish Tiwari ◽  
Pardeep Pankaj ◽  
Saurav Suman ◽  
Piyush Singh ◽  
Pankaj Biswas ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Tool Life ◽  
Force Measurement ◽  
Deep Understanding ◽  
High Strength ◽  
Microstructural Characterization ◽  
Stir Zone ◽  
Friction Stir ◽  
Allotriomorphic Ferrite ◽  
Fsw Parameters

Friction stir welding (FSW) of high strength materials is challenging due to high tool cost and low tool life. To address this issue, the present investigation deals with an alternative of plasma-assisted friction stir welding (PFSW) of DH36 steel with WC-10%Co tool. Plasma preheating current (13 A, 15 A, and 17 A) was varied by keeping other FSW parameters as constant. During the FSW and PFSW process, force measurement and thermal history aided in a deep understanding of the process, tool degradation mechanisms, accompanied by the mechanical and microstructural characterization of the welded joints. The stir zone hardness was increased from 140 HV0.5 to about 267 HV0.5. The yield and tensile strength of weld increased from 385 MPa and 514 MPa to about 391 MPa and 539 MPa, respectively. Weld joint elongation (%) was increased from ~10% of weld 1 to ~13.89% of weld 4. During PFSW, the process temperature was increased, the cooling rate was lowered, and the weld bead was widened. The results also revealed that the plasma-assisted weld resulted in polygonal ([Formula: see text]) and allotriomorphic ferrite as the major constituents in the stir zone. Pearlite dissolution and spheroidization were observed in the ICHAZ and SCHAZ, respectively. Additionally, the plasma preheating reduced the tungsten tool’s wear by 58% compared to FSW.

The Effect of Cut Tool Geometric Parameters on Tool Tear of Machining Nickel-Base GH4169 Super Alloys

2010 ◽  
Vol 37-38 ◽  
pp. 1457-1461 ◽  
Author(s):  
Zhao Peng Hao ◽  
D. Gao ◽  
R.D. Han
Keyword(s):  
Tool Life ◽  
Cutting Speed ◽  
High Strength ◽  
Rake Angle ◽  
Geometric Parameters ◽  
Cutting Edge ◽  
Factors Affecting ◽  
Edge Angle ◽  
Coated Tools ◽  
Nickel Base

Nickel-based super alloy GH4169 has been widely used in aerospace industry because of its good mechanical properties under high temperature. However, it is difficult to machine for its high strength, poor thermal conductivity and serious work-hardening. The effects of tool geometric parameters on tool life are studied by machining experiments using YG8 tools with different cutting edge angle in this paper. The tool with cutting edge angle 45°has longer tool life than 75°. The cutting experiments have been carried out using TiAlN (PVD) coated tools (AC520U) with different rake angle. It shows that the tool life with rake angle 9° were increased by 50% and 25% compared to tool with rake angle 3°and 6° when cutting speed is 30m/min. The tool with rake angle 9° is not suitable for cutting GH4169 when cutting speed is more than 35m/min. The results show that geometric parameter of cutting tool is one of the important factors affecting tool life.

Reproducibility of Wear Tests and the Effect of Load on Tool Life in Sheet Metal Forming

2014 ◽  
Vol 1018 ◽  
pp. 293-300 ◽  
Author(s):  
Matthias Christiany ◽  
Peter Groche
Keyword(s):  
Tool Life ◽  
High Strength Steels ◽  
High Strength ◽  
Load Level ◽  
Wear Behaviour ◽  
New Approach ◽  
Advanced High Strength Steels ◽  
Drawing Test ◽  
Strip Drawing ◽  
Wear Tests

The increasing use of advanced high strength steels challenges the forming industry. Data on tool life are not available, thus causing uncertainties in the choice of suitable tribological systems. This paper investigates the reliability of a strip drawing test and the effect of the load level on tool life. Reproducibility of wear tests is barely discussed in literature. This study shows that a wear analysis on the base of a strip drawing test allows reproducible data. However, even small differences of the initial parameters can affect the result. A further investigation shows a distinct relationship between tool life and load level. Furthermore, the predominant wear mechanism is also influenced by the applied load. The findings on wear behaviour and reproducibility can be used for a new approach to estimate tool life in industrial forming processes on the base of a model test.

Tools Optimization in Efficient Intermittent Cutting of 2.25Cr1Mo0.25V Steel

2011 ◽  
Vol 188 ◽  
pp. 469-474
Author(s):  
Han Lian Liu ◽  
Xiang Lv ◽  
Chuan Zhen Huang ◽  
Zeng Bin Yin ◽  
Bin Zou ◽  
...  
Keyword(s):  
Tool Life ◽  
High Strength ◽  
Cutting Parameters ◽  
Machining Efficiency ◽  
Coated Tool ◽  
Intermittent Turning ◽  
Tool Types ◽  
Coated Carbide ◽  
Intermittent Cutting ◽  
Coated Carbide Tools

In order to improve the machining efficiency of high strength steel 2.25Cr1Mo0.25V and tool life, intermittent turning performance of 2.25Cr1Mo0.25V with common carbide tools and advanced coated carbide tools was experimentally studied, cutting parameters and tool types were optimized. The results showed that the machining efficiency and tool life of advanced coated carbide tools were remarkably higher than that of common carbide tool; the tool life of quadrate coated tool was longer than that of circular tool. The cutting tool failure mechanisms were also discussed.

Experimental Study on the Milling of a High Strength Titanium Alloy

2004 ◽  
Vol 471-472 ◽  
pp. 731-735 ◽  
Author(s):  
Guo Sheng Geng ◽  
Jiu Hua Xu ◽  
Ying Fei Ge ◽  
Yu Can Fu
Keyword(s):  
Titanium Alloy ◽  
Tool Wear ◽  
Tool Life ◽  
High Speed ◽  
Design Method ◽  
Orthogonal Experiment ◽  
High Strength ◽  
Machined Surface ◽  
Heavy Load ◽  
Metallographic Examination

A series of experiments were carried out on normal and high speed milling of a high strength titanium alloy (TA15). TA15 is a close alpha titanium alloy strengthened by solid solution with Al and other component. It is often used to make large structural parts in airplane and welded parts subject to heavy load. The tool life of several typical types of cutter commonly used in the milling of titanium alloy was studied by the orthogonal experiment design method. After multi-element regression analysis, the empirical equation of the tool life was stablished. The milling force and temperature were measured under different cutting conditions and tool wear status. The knowledge is useful to further understand and analysis of the cutting mechanism, machining quality and tool wear. The study on the machined surface integrity includes the following content: surface roughness, metallographic examination, work hardening and residual stress.

The Machinability of a High Strength Zirconium 8.6 Wt% Aluminum Alloy: Tool-Life Curves

1980 ◽  
Vol 102 (1) ◽  
pp. 20-24
Author(s):  
E. M. Schulson ◽  
D. M. Norman
Keyword(s):  
Aluminum Alloy ◽  
Tool Life ◽  
Single Phase ◽  
Metal Removal ◽  
Cutting Speed ◽  
High Strength ◽  
Al Alloy ◽  
Two Phase ◽  
Turning Operations ◽  
Alloy Tool

Tool-life curves have been obtained for an experimental, high-strength Zr 8.6 wt% Al alloy, in two metallurgical states (two-phase Zr2Al/Zr and single phase Zr3Al). Below a critical cutting speed, the data obey the Taylor expression V τn = C, where V is the cutting speed, τ is tool-life and n and C are constants. This expression is used to determine the cutting conditions which optimize the rate of metal removal during turning operations.

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