Features of induction heating during hardening of tools from high-speed steel

2020 ◽  
pp. 72-75
Author(s):  
A.M. Adaskin
Keyword(s):  
High Frequency ◽  
High Speed ◽  
High Speed Steel ◽  
Salt Bath ◽  
Complete Dissolution ◽  
Carbide Matrix ◽  
Kinetics Of ◽  
Frequency Current ◽  
High Frequency Induction

The fundamental differences in the kinetics of transformations of high-speed steels during heating by high-frequency induction currents (HFC) and in salt baths are considered. At HFC, the high temperature at the "carbide — matrix" boundaries promotes more complete dissolution of carbides in austenite, which improves the quality of the tool. Keywords: high frequency current, salt bath, hardening, high speed steel, interphase boundary. [email protected]

scholarly journals The Oxidation Behaviors of Indefinite Chill Roll and High Speed Steel Materials

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1095
Author(s):  
Liang Hao ◽  
Tuanjie Li ◽  
Zhongliang Xie ◽  
Qingjuan Duan ◽  
Guoyuan Zhang
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Isothermal Oxidation ◽  
Humid Air ◽  
Rolling Mills ◽  
Dry Air ◽  
Oxide Phases ◽  
Work Rolls ◽  
Oxidation Behaviors

Indefinite chill (IC) roll and high speed steel (HSS) materials have been widely employed to manufacture work rolls as latter and former stands in hot rolling mills. The oxidation of work rolls is of importance for the surface quality of the rolled workpieces. The isothermal oxidation of the IC and HSS materials was conducted at 650 °C and 700 °C in both dry air and humid air. The isothermal oxidation curves indicate that HSS shows faster kinetics than the IC materials in dry air, whereas the opposite occurred in humid air. The oxide scales of the IC materials after the oxidation in both dry air and humid air are made up of two oxide phases. Two oxide phases were found when the HSS oxidized in the dry air and three oxide phases were found when oxidized in the humid air.

Three Dimensional Analysis of High Frequency Induction Welding of Steel Pipes With Impeder

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Hyun-Jung Kim ◽  
Sung-Kie Youn
Keyword(s):  
Temperature Distribution ◽  
High Frequency ◽  
Three Dimensional ◽  
Proximity Effects ◽  
Small Scale ◽  
Element Analysis ◽  
Steel Pipes ◽  
High Processing Speed ◽  
High Frequency Induction

High frequency induction welding is widely employed for longitudinal seam welding of small scale tubes and pipes due to its relatively high processing speed and efficiency. This research is aimed at understanding the variables that affect the quality of the high frequency induction welding. The welding variables include the welding frequency, weld speed, vee angle, and tube thickness. Temperature distribution of the tube is calculated through three dimensional coupled electromagnetic and thermal finite element analysis. The skin and proximity effects are considered in the electromagnetic analysis. The influence of the impeder is also analyzed. The effects of the operating welding variables on the temperature distribution are investigated quantitatively by exhibiting the heat affected zone. The results explain the mechanism of significant enhancement of welding efficiency when the impeder is used. Not only good weld state can be obtained but also overheated edge can be avoided by understating the effect of welding variables. Suggestions are made for the better induction welding conditions.

scholarly journals Analysis of the Performance of Drilling Operations for Improving Productivity

2021 ◽  
Author(s):  
Majid Tolouei-Rad ◽  
Muhammad Aamir
Keyword(s):  
High Speed ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Dimensional Accuracy ◽  
Vital Role ◽  
Machining Process ◽  
Drilling Process ◽  
Single Shot ◽  
Drilling Operations

Drilling is a vital machining process for many industries. Automotive and aerospace industries are among those industries which produce millions of holes where productivity, quality, and precision of drilled holes plays a vital role in their success. Therefore, a proper selection of machine tools and equipment, cutting tools and parameters is detrimental in achieving the required dimensional accuracy and surface roughness. This subsequently helps industries achieving success and improving the service life of their products. This chapter provides an introduction to the drilling process in manufacturing industries which helps improve the quality and productivity of drilling operations on metallic materials. It explains the advantages of using multi-spindle heads to improve the productivity and quality of drilled holes. An analysis of the holes produced by a multi-spindle head on aluminum alloys Al2024, Al6061, and Al5083 is presented in comparison to traditional single shot drilling. Also the effects of using uncoated carbide and high speed steel tools for producing high-quality holes in the formation of built-up edges and burrs are investigated and discussed.

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