Abstract
The task of increasing the efficiency of machining parts on heavy machines was determined, scientifically substantiated and solved by hardening a carbide tool the pulsed magnetic field processing (PMFP). The efficiency of machining of parts is understood as an increase in its productivity, a reduction in the cost and costs of tool materials, and an increase in instrument reliability. The working conditions of cutting tools at heavy engineering enterprises are analyzed. The wear resistance of carbide cutting tools, which have been strengthened by the PMFP, was investigated using forced test methods and modeling of the cutting process. The mechanism of changing the properties of a hard alloy under the action of a pulsed magnetic field is established. The main factors affecting the change in the wear resistance of a hard alloy under the action of a pulsed magnetic field are identified. The effect of pulsed magnetic field processing on the performance of carbide cutting tools under production conditions is investigated. The effect of hardening on productivity, cost of operation and instrumental costs is established. The interrelation of the parameters of the PMFP, the parameters of the process of machining parts and production efficiency is investigated. A statistical model has been developed that allows determining the productivity of mechanical processing depending on the properties of the tool material and the processing parameters of a pulsed magnetic field.
Highlights
An important task is to improve the tooling of new machines for highprecision productive machining of difficult-to-machine materials by applying the latest tool strengthening methods
For our case previous machining of metals with hard-alloy cutting tools that are reinforced with machining by pulsed magnetic field (MPMF), the system is represented in Figure.[1] as a relationship of parameters that characterise the machining process and production efficiency from MPMF
It has been established that the use of pulse magnetic field machining improves the optimum resistance by a factor of 1.4-2
Summary
An important task is to improve the tooling of new machines for highprecision productive machining of difficult-to-machine materials by applying the latest tool strengthening methods. An analysis of different methods for enhancing the physical and mechanical properties of hard-alloy tool materials showed that the best combination of cost and production efficiency was observed with the pulsed magnetic field machining method. Metal machining efficiency was evaluated in terms of objective functions which characterise productivity Q, cost C and tooling cost S depending on tool resistance and cutting modes. In these functions, the influence of tool resistance dissipation was taken into account. As in production conditions the tool resistance dissipation takes place, the cutting conditions should be prescribed in order to ensure the durability with a given reliability P
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