scholarly journals High Performance Gear Hobbing with powder-metallurgical High-Speed-Steel

Procedia CIRP ◽  
2012 ◽  
Vol 1 ◽  
pp. 196-201 ◽  
Author(s):  
Bernhard Karpuschewski ◽  
Hans-Joachim Knoche ◽  
Martin Hipke ◽  
Martin Beutner
Keyword(s):  
High Speed ◽  
High Performance ◽  
High Speed Steel ◽  
Gear Hobbing

scholarly journals Direct fabrication of high-performance high speed steel products enhanced by LaB 6

2016 ◽  
Vol 112 ◽  
pp. 469-478 ◽  
Author(s):  
Zhang Qiankun ◽  
Jiang Yao ◽  
Shen Weijun ◽  
Zhang Huibin ◽  
He Yuehui ◽  
...  
Keyword(s):  
High Speed ◽  
High Performance ◽  
High Speed Steel ◽  
Direct Fabrication

scholarly journals High Performance Valve Seat Materials for CNG Powered Combustion Engines

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4860
Author(s):  
Andrzej Romański ◽  
Elżbieta Cygan-Bączek
Keyword(s):  
High Speed ◽  
High Performance ◽  
Base Material ◽  
High Speed Steel ◽  
Wear Test ◽  
Gas Temperature ◽  
Valve Seat ◽  
Test Procedures ◽  
Gasoline Engines ◽  
Engine Valves

The conventional copper infiltrated high speed steel (HSS) valve seats used in gasoline engines are not suitable for CNG combustion because the exhaust gas temperature is at least 80 °C higher, which drastically shortens the service life of the engine valves. Therefore, a proprietary high-alloy HSS-base material was designed to combat hot corrosion and mechanical wear of valve seat faces in CNG fuelled engines. A batch of −100 mesh water atomized HSS powder was commissioned. The powder was vacuum annealed in order to reduce oxygen content and increase its compressibility. To improve the final part machinability, 1.2% MnS was admixed to the HSS powder prior to compaction. The green compacts were sintered at 1135 °C in nitrogen to around 83% TD and subsequently infiltrated with a copper alloy. After installing the valve seat components on a cylinder head, the engine was tested for 100 h according to the automotive industry valve seat wear test procedures. Both the periodic 8-h checks as well as the final examination of the valve seats showed very slow wear, indicating their suitability for CNG powered engines.

scholarly journals Impact of High-Speed Image Recognition of Transition Phenomenon of Chip Formation and Chip Flow in Gear Hobbing Process

2010 ◽  
Vol 437 ◽  
pp. 189-193 ◽  
Author(s):  
Yoji Umezaki ◽  
Syuhei Kurokawa ◽  
Yasutsune Ariura
Keyword(s):  
High Speed ◽  
High Speed Steel ◽  
Simulation Method ◽  
Video Camera ◽  
Rake Face ◽  
Dry Cutting ◽  
Chip Flow ◽  
High Speed Video Camera ◽  
Gear Hobbing ◽  
And Behavior

The transient phenomenon of chip generations and behavior in the gear hobbing process are investigated by using a high-speed video camera. The chip behavior generated in gear finish hobbing process is very complicated and one can not identify each chip from specified cutting edges. The authors have built up a new simulation method of the hobbing process using a flying tool and a special-shaped workpiece, which consists of one tooth space. Visual evidences of the chip interference on the rake face and some conditions of contact between generated chips and the work surface were visually obtained. In the case of dry cutting conditon with a high-speed steel (HSS) flytool without coating on the rake face, the flytool cuts the workpiece frequently with the stuck chip generated in the previous revolution on the rake face. The newly generated chip pushes out the previous stuck chip, which flies away eventually. The chip flow on the rake face interferes strongly at the corner of the cutting edge when both top and side cutting edges produce different chips at the same time, and the chips flow out in changing the shape. The moving speed of the chip was also measured.

VANADIS 30

Alloy Digest ◽  
1999 ◽  
Vol 48 (1) ◽  
Keyword(s):  
Wear Resistance ◽  
Powder Metallurgy ◽  
High Speed ◽  
High Performance ◽  
High Speed Steel ◽  
Heat Treating ◽  
Positive Influence ◽  
Hot Strength ◽  
Cobalt Addition ◽  
Hot Hardness

Abstract Vanadis 30 is cobalt alloyed high-performance, high-speed steel made by powder metallurgy. The cobalt addition of approximately 8.5% has a positive influence on the hot strength, hot hardness, temper resistance, and modulus of elasticity. Punches are a suitable application for this alloy. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on wear resistance as well as heat treating and surface treatment. Filing Code: TS-566. Producer or source: Uddeholm Tooling AB.

Gear Hobbing Cutting Process Simulation and Tool Wear Prediction Models

2001 ◽  
Vol 124 (1) ◽  
pp. 42-51 ◽  
Author(s):  
K.-D. Bouzakis ◽  
S. Kombogiannis ◽  
A. Antoniadis ◽  
N. Vidakis
Keyword(s):  
Tool Wear ◽  
High Speed ◽  
Prediction Models ◽  
Numerical Models ◽  
High Speed Steel ◽  
Cutting Process ◽  
Wear Prediction ◽  
Tool Wear Prediction ◽  
Gear Hobbing ◽  
The Individual

Gear hobbing is an efficient method to manufacture high quality and performance toothed wheels, although it is associated with complicated process kinematics, chip formation and tool wear mechanisms. The variant cutting contribution of each hob tooth to the gear gaps formation might lead to an uneven wear distribution on the successive cutting teeth and to an overall poor tool utilization. To study quantitatively the tool wear progress in gear hobbing, experimental-analytical methods have been established. Gear hobbing experiments and sophisticated numerical models are used to simulate the cutting process and to correlate the undeformed chip geometry and other process parameters to the expected tool wear. Herewith the wear development on the individual hob teeth can be predicted and the cutting process optimized, among others, through appropriate tool tangential shifts, in order to obtain a uniform wear distribution on the hob teeth. To determine the constants of the equations used in the tool wear calculations, fly hobbing experiments were conducted. Hereby, it was necessary to modify the fly hobbing kinematics, applying instead of a continuous tangential feed, a continuous axial one. The experimental data with uncoated and coated high speed steel (HSS) tools were evaluated, and correlated to analytical ones, elaborated with the aid of the numerical simulation of gear hobbing. By means of the procedures described in this paper, tool wear prediction as well as the optimization of various magnitudes, as the hob tangential shift parameters can be carried out.

scholarly journals Study of the processing of small diagnostic creations on a fluid sourcing by spiral survivals

2020 ◽  
Vol 6 (1) ◽  
pp. 14-21
Author(s):  
Roman Karpyk ◽  
◽  
Nazar Kostiuk ◽  
Keyword(s):  
Axial Force ◽  
High Speed ◽  
High Performance ◽  
Metal Cutting ◽  
Small Diameter ◽  
High Speed Steel ◽  
Drilling Process ◽  
Constructive Development ◽  
The Impact ◽  
Technological Methods

The article considers the features of the drilling process where there is a change in temperature, hole diameter, and displacement relative to the axis and the impact on the tool, when machining holes with high-speed steel drills there is wear of the transverse edge which is completely rounded to create a conical surface. There is a decrease in the negative value of the front corners on the transverse edge of the decrease in axial force, which led to a decrease in the intensity of wear of the transverse edge. In order of increasing axial force, respectively, and the intensity of wear of the transverse edge, were sharpened and recommended sharpening methods that provide high performance of the drill, the greatest stability, increased drilling accuracy, as well as the lowest cutting force. The analysis of influence of technological methods and ways and equipment on accuracy and quality of deep openings of small diameter is carried out. The effects of the method of lubricating coolant supply on the tool stability and processing productivity are investigated. The analysis of processing on the metal-cutting equipment with constructive development of the device is executed. Also, the stress-strain state of the drilling process by the finite element method with the analysis of external influences on the twist drill is carried out. The results of the research substantiate and recommend technological methods that reduce the deformation of the tool and, as a consequence, increase the quality and accuracy of the dimensions of deep holes of small diameter.

The Development of a High Speed Steel Based Sintered Material for High Performance Exhaust Valve Seat Inserts

1998 ◽  
Author(s):  
Hideaki Kawata ◽  
Koichiro Hayashi ◽  
Kei Ishii ◽  
Kunio Maki ◽  
Atsushi Ehira ◽  
...  
Keyword(s):  
High Speed ◽  
High Performance ◽  
Sintered Material ◽  
High Speed Steel ◽  
Exhaust Valve ◽  
Valve Seat ◽  
Valve Seat Inserts

BÖHLER S400

Alloy Digest ◽  
2019 ◽  
Vol 68 (5) ◽  
Keyword(s):  
Physical Properties ◽  
High Speed ◽  
High Performance ◽  
High Speed Steel

Abstract Böhler (or Boehler) S400 is a conventional high-speed steel for applications in machining. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on forming. Filing Code: TS-765. Producer or source: Voestalpine High Performance Metals Corporation.

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