Fig 2 - available via license: CC BY
Content may be subject to copyright.
Examples of technological methods of plasma hardening: a-profile cutting of the cultivator disc with simultaneous hardening of the edge, b-hardening of the edge of the graders knife with a scanning plasma arc, c-hardening of the neck of the shaft with a plasma arc at a high speed of rotation during the motion of the plasma torch, d-hardening of the neck of the shaft with a scanning plasma arc.
Source publication
The article shows the advantages of plasma hardening in comparison with other methods of surface hardening of steel products. Appropriate schemes of hardening of various products are considered and experimental data characterizing the possibility of obtaining a hardened layer of various thickness during the realization of various methods of plasma...
Contexts in source publication
Context 1
... the required thickness on the surface of the workpiece. That thickness can be obtained within rather wide limits (Fig. 1, a). For example, contour processing of discs of cultivators made of 65G steel can be effectively carried out by plasma cutting, and a surface layer with high hardness is automatically created on the working surface of the disk (Fig. 2, ...
Context 2
... practice, this makes it possible to implement various schemes of plasma hardening that are simply realized and can be completely automated. For example, the plasma hardening of the working surface of the graders knives (Fig. 2, b) operating under exceptionally hard conditions with intensive abrasive action should ensure an increase in their service life. When this process is realized (see Fig. 2, b) the workpiece 2 moves forward under the plasma torch 2 with a magnetic deflection system 3 mounted on it that allow to expand the heating zone B to 40 ... 60 ...
Context 3
... various schemes of plasma hardening that are simply realized and can be completely automated. For example, the plasma hardening of the working surface of the graders knives (Fig. 2, b) operating under exceptionally hard conditions with intensive abrasive action should ensure an increase in their service life. When this process is realized (see Fig. 2, b) the workpiece 2 moves forward under the plasma torch 2 with a magnetic deflection system 3 mounted on it that allow to expand the heating zone B to 40 ... 60 ...
Context 4
... hardening necks of shafts, it is possible to implement a processing scheme in which the anode spot of the plasma arc is located directly on the surface of the shaft (Fig. 2, c). However, in order to prevent surface melting it is required to apply a high speed of the workpiece motion, at which the depth of the hardened layer is small enough. At the same time, repeated action of the arc onto the surface of the workpieces with small diameters (<100 mm) leads to their overheating, low rate of structural ...
Context 5
... At the same time, repeated action of the arc onto the surface of the workpieces with small diameters (<100 mm) leads to their overheating, low rate of structural transformations, which prevents the formation of a martensitic layer on the surface. Therefore, in this case there is also rational the application of heating by a scanning plasma arc (Fig. 2, d) which can move along the surface at a much slower speed without surface melting, and the hardened layer can reach a much larger ...
Citations
... The advantages of this approach include focusing the impact of the energy flow at a given location on the part.In this case, the energy flow is able to change its structure, volume, surface properties, and by scanning the surface to do this on the entire product. These flows can refer to different types of laser, plasma, hydroabrasive, magnetic, electronic, electrolyteplasma processing [3][4][5][6][7][8][9][10][11]. Among these technologies, the electrolyte-plasma technology with the use of a focused electrolyte jet occupies a special place. ...
This article discusses the method of choosing electrodes-tools for jet machine electrolytic-plasma processing. An analysis of the choice of electrodes - tools based on a significant number of experiments on surface treatment in a wide range of technological modes from dimensional to finishing is proposed. The possibility of removing surface layers in the range of 18–600 μm, voltage range of 20–500 V, and electrolyte flow rate of 1–90 l/h is considered. The proposed methodology is based on the use of calculations in the COMSOL Multiphysics environment. On the basis of the proposed method, computer modeling of tool electrodes was performed in the SolidWorks program. Jet Machining with electrode tools developed on the basis of this technique will show satisfactory results. The removal rate of the surface layer of materials has increased significantly compared to the treatment with a hollow cathode. The use of an accordion-type tool makes it possible to remove 90–150 μm from the surface in one pass. The developed technique makes it possible to develop tool electrodes for a wide range of technological operations. The obtained results suggest their use for industrial processing of curved surfaces of turbine blades, excluding the operations of manual grinding and polishing.KeywordsSelection MethodologyJet TreatmentElectrolyte PlasmaElectrode-ToolFinishingRough Processing
