Mar 07,2016·Research result shows that the optimum parameters of laser quenching about 20CrMnMo gears are the following laser power P = 2300 W,the scanning speed v = 750 mm/min,spot diameter d = 14 mm; the maximum hardness of tooth surface is 61.4 HRC,the microstructures are compact needle and plate strip martensite,the grain size is about 9°; equivalent hardened layer depth results for this questionHow does a laser quench a phase transition point?How does a laser quench a phase transition point?Laser quenching is the use of a laser to heat the surface of a material above the phase transition point.As the material cools itself,the austenite transforms into martensite,which hardens the surface of the material.Laser Quenching MachineMfg
Research result shows that the optimum parameters of laser quenching about 20CrMnMo gears are the following laser power P = 2300 W,the scanning speed vCase Hardness - an overview ScienceDirect TopicsThe gears were made from 20CrMnMo steel. an increase in hardness of Ni-based alloy powder with the addition of 50 wt% WC particles processed via two-stage process of laser cladding using a CO 2 laser. The cracking of the two gear-teeth was confirmed to have occurred during the carburization-quenching process.
Feb 26,2019·The number of process steps required to case carburize a gear can be significantly reduced only if the gear tooth surface areas are heat treated.Processes for locally heating only the tooth surface include induction,flame,laser,and electron beam.In order to use induction,steel with a minimum of 0.5% carbon must be used.Controlling Distortion in Heat Treatment Through Press Introduction.Press quenching is a specialized quenching technique that may be utilized to minimize the distortion of complex geometrical components during heat treatment 1.Distortion is routinely encountered in industrial heat treating operations,and is an especially important consideration where high accuracy,precision components are concerned.
Research result shows that the optimum parameters of laser quenching about 20CrMnMo gears are the following laser power P = 2300 W,the scanning speed vDirect laser hardening of AISI 1020 steel under controlled Mar 15,2020·Yan et al.used two step plasma nitriding and laser quenching to improve the surface properties of 30CrMnSiA steel.They reported an increase in the thickness and hardness of the modified layer using two-step process compared to just plasma nitriding.Colombini et al.performed laser quenching after nitriding treatment on 40CrMnMo7 steel.Like Effect of Heat Sink and Cooling Mediums on Ferrite In order to control the ferrite and austenite percentage in duplex stainless steel welding,many researchers try to change the laser welding parameters and cooling medium,but ignore to study the influence of heat sink effect on weld strength.In this work,the effect of aluminium heat sink and varying cooling medium on the laser welding of duplex stainless steel (DSS) 2205 is studied.
analysis tools.The experimentations are carried out on AISI 4340 steel spur gears using a commercial 3 kW Nd:YAG laser system.Laser power,scanning speed,and rotation speed are used as process parameters to evaluate the variation of the hardened depth and to identify the possible relationshipFeasibility Studies on Underwater Laser Surface Hardening A scanner (SCANLAB hurrySCAN 20) was used to control the laser scanning method.The chamber was filled by argon gas in all experiments.The vertical movement of the cylinder was driven by a motor.The experimental conditions for the laser hardening are shown in Table 2.Finite element analysis on quenching process of In the quenching process of automotive transmission helical gear,the control of temperature,stress and thermal deformation has always been a difficult problem in the industry,and the thermal deformation in the process of gear quenching is mainly caused by the thermal stress caused by uneven cooling.In order to improve the strength,toughness and reliability of mechanical parts,at present
Introduction to Flame-Hardening It is a surface-hardening process in which a thin surface section of a component of hardenable steel is heated rapidly by direct application of high temperature flame to a temperature above its upper critical temperature (i.e.,it is austenitized),and then the component is quickly quenched in water or oil,transforming austenite to martensite,while the Flame Hardening - an overview ScienceDirect TopicsRudolph Laubscher,in Advanced Gear Manufacturing and Finishing,2017.6.4.2.2.2 Flame Hardening.Flame hardening is a heat treatment process where oxyfuel gas flames are directly impinged onto the gear-tooth surface area to be hardened which is then subjected to quenching.It results in a hard surface layer of martensite over a softer interior Flatness evolution of cold-rolled high-strength steel In this work,the quenching process is divided into three stages in stage I,the steel strip rapidly decreases from a high temperature to the martensite start temperature,the steel strip is not subject to martensitic transformation,and the time interval corresponding to this process is 00.754 s; in stage II,the strip is subject to martensitic transformation and the time interval corresponding to this process is
A third method for heat-treating gearing is to carburize the gear (Figure 3 and Figure 4).Carburization is the process of placing the gear into an oven with added carbon and heating the oven to several hundred degrees Celsius for an extended period of time.This process allows the added carbon to penetrate into the molecular structure of the gear.Laser Quenching MachineMfgLaser fused quenching technology is a process in which the surface of the substrate is heated to a melting temperature by using a laser beam,and the surface of the molten layer is rapidly cooled and solidified by the heat conduction cooling inside the substrate. and the laser hardening research project of gears was undertaken by the Laser beam surface hardening of CVD TiN-coated steels Research result shows that the optimum parameters of laser quenching about 20CrMnMo gears are the following laser power P = 2300 W,the scanning speed v
Conventional Heat TreatingLaser TechniquesDirect Diode LasersApplicationsHeat treating,or case hardening,is a process used in many industries to improve the wear characteristics and extend the lifetime of steel parts such as cutting tools and shaft bearing surfaces.Heat treating involves heating and then rapid cooling (called quenching) of a part.This transforms the steel's crystalline structure by incorporating carbon in a way that makes the lattice harder than normal at room temperature.For industrial case hardening,the goal is to harden only a thin outer layer.The bulk material retains itsSee more on industrial-lasersTemperature Field Numerical Analysis Mode andconnecting rod,gear,and so forth must have high local hardness and wear-resistant parts.Most of them use steel with a carbon content of approximately 0.4% for surface hardening heat treatment.In the past decade,there has been much research on obtaining the best laser quench hardening parameters.Laser powder bed fusion of 30CrNiMo8 steel for quenching The layer-by-layer principle of additive manufacturing technology laser powder bed fusion (LPBF) opens up completely new possibilities in the design and manufacturing of lightweight and efficient gear components.For example,integration of contour conform cooling and lubrication channels into gear components can increase their service life and reduce lubricant consumption.M.Heidkamp's research works Institut für Reference Research on laser quenching process of 20CrMnMo gears by finite element method and experiment Laser beam surface hardening of CVD TiN-coated steels Citing article
The effective case depth (ECD) plays an important role in the meshing strength of internal gear transmissions.Carburizing quenching heat treatment is commonly used to enhance gear strength and wear resistance.However,the different ECDs in internal and external gears caused by heat treatment significantly affect the meshing strength,causing vibration,reducing gear service life,and Modeling of distortions after carburization and quenching Feb 21,2013·Srinivasan et al investigated an immersion quench process of a real automotive engine cylinder head .Song et al studied the carburization and quenching processes of a gear ring with outer diameter of approximately 250 mm .To the best of the author's knowledge,the previously mentioned three-dimensional effects have not been included in such Modeling of distortions after carburization and quenching Feb 21,2013·The first is the influence of the gear's own weight while hanging on chains before,during and after entering the quench bath.The second is the three-dimensional effect that it takes time between the moment the gear enters the oil quenching bath and the moment when the gear is fully immersed.
Feb 01,2021·For larger workpieces (such as the rail),laser full area quenching will result in an overlapping of laser quenching spots,leading to two technical difficulties (1) the overlapping process is very difficult to control,and the overlapped area will become the weakness of the workpiece; (2) the ductility of the material is reduced after laser RLH-A Laser Hardening ABICOR BINZELRLH-A in the Scapacs &optic building blocks is a 1-D scanner with integrated highly dynamic temperature control.This system enables the components to be hardened in a selective and controlled process.RLH-A meets the trending demand for toughness and hardness in the increasingly complex components being used in motors and gears,which are very difficult to achieve with traditionalResearch Progress of Gear Laser Quenching--Surface This article summarized the research progress on the theories of laser quenching,and meanwhile analyzed the formation mechanism of hardening layer,as well as its difference from the formation mechanism of the traditional gear quenching methods.Through the analysis of scanning way,offset,scanning speed,angle of incidence and auxiliary cooling technology in the process of laser quenching
Mar 07,2016·To explore laser quenching process of 20CrMnMo gear,finite element analysis of the quenching process and laser quenching experiment were performed.First,a finite element model of laser quenching process was built,with surface effect unit was added to the 3D model of gear.Then,the load was applied by two kinds of ways including manual mode and APDL language.Research on laser quenching process of 20CrMnMo gears by To explore laser quenching process of 20CrMnMo gear,finite element analysis of the quenching process and laser quenching experiment were performed.First,aResidual Stresses in Case Hardened Steel Gears Gear A spur-gear geometry was rough-machined prior to full heat treatment,and subsequent surface finishing.The evolution of bulk residual stress distribution within the gears throughout the manufacturing process was measured using the Contour Method.Surface residual stresses,complimentary to contour method,have been measured by X-ray diffraction.
This paper aims at encouraging the use of laser treatment as an environmentally friendly technique to improve the mechanical properties of metallic materials over conventional quenching and tempering techniques through the study of the tribological behavior of AISI 1538 MV steel subjected to surface laser quenching treatment.Sliding wear tests were carried out by the pin-on-disk method.Survey of research and applications of laser heat Also the technical development and spreading of laser heat treatment is reported.Over 20 academic exchange activities home or abroad were organized by our country.In China,there are near 1,000 units and about 5,000 intermediate and senior scientists and engineers engaged in the research,development and production of laser heat treatment.
Jan 01,2020·This research discusses the development and validation of a sustainable process chain for the efficient manufacturing of prototype gears for automotive applications.To reach the objectives,a selective laser hardening set-up has been integrated into a multi-axis machining platform.