The method of hardening metal-cutting tools


The invention relates to the field of metal working, and in particular to methods of improving the wear resistance of metal-cutting tools. The invention allows to expand the range of machined tools, as well as reduce the cost of electricity. The tool part is subjected to application to the full magnetic saturation. Then produce a demagnetization and epidemiologie. Epidemiologie carried out simultaneously with demagnetization. table 1.

The invention relates to the field of metal working, and in particular to methods of improving the wear resistance of metal-cutting tools.

A known method of manufacture of the tool.with. The USSR 975209, including magnetization to a complete magnetic saturation and subsequent degaussing tool. The result is a reorganization of the internal structure with redistribution of dislocation defects. Structural changes lead to increased wear and durability of the tool. This method does not give stable results, improve performance. A known method of manufacture of the tool.with. The USSR 1484539, which consists in coating the surface of a thin film of polymeric material, coloristically instrument is increased by reducing these factors. But the use of the tool with epidamnum coating limited by the resistance of epilame.

The closest in technical essence is a method of manufacturing a metal-working tool (see "Aviation industry", 5, 1998 , S. 43-44), which consists in magnetizing tool to complete magnetic saturation in the environment epilame (with simultaneous epidemiologie) and subsequent demagnetization. This method gives more stable results than separate magnetic hardening and epidemiologie.

The disadvantages of the method are unsatisfactory compatibility of the processes of magnetization and epidemiologia. The magnetization lasts no more than one minute (when pulsed magnetization time leads to a negative result), and the process of epidemiologia many times, from 10 to 60 minutes, the magnetization Process requires high energy costs, so to maintain a high magnetic field strength when epidemiologii not rational. In addition, the magnetization in the environment epilame limits the range of technical capabilities of the device for magnetizing, as the container epilame inside magnetizing Wii. When the contact magnetization constant magnetic field can magnetize the tool of any size and configuration. But in this case the container epilame breaks contact with the poles of the magnetizing device and does not effective magnetization.

The invention solves the problem of the expansion of the nomenclature of cultivated tool, as well as reducing waste of electricity.

The problem is solved as follows. The known method is the magnetization tool for magnetic hardening. Epidemiologie produce in the second stage of the process - demagnetization. The demagnetization usually produce an alternating magnetic field with a damped oscillation amplitude. For demagnetization does not require a magnetic field of high tension, so contact with the poles not mandatory. To remove residual magnetism rather a tool with a certain velocity to move over demagnetizing device. If the product be placed in a container with epilame, it will not affect the process of demagnetization. In addition, the alternating magnetic field has a positive effect on the process of applying epilame on p the molecules of epilame; magnetostrictive oscillations contribute to a better penetration and filling of micropores and microcracks on the surface of the product, which, as experience has shown, prevents them from further destruction.

Improvement of the internal structure of the metal tool with a simultaneous improvement of the technical characteristics of the surface has led to a steady increase wear of the tool. Combining operations epidemiologia and demagnetization allows this method of hardening without restrictions on the size and configuration tool, using the equipment for magnetic hardening. In addition, this method reduces wasteful energy costs 3-4 times by reducing the time of high-energy impact.

The example was Made an experimental batch of end milling of steel R6M5 with a diameter of 10 mm and a diameter of 60 mm 10 pieces in each batch. Magnetic hardening treatment was performed on the installation ULV-3, the consuming power of 1.2 kW and generates a magnetic field H= 8106A/m Demagnetization was carried out on a special device for degaussing with a power consumption of 0.3 kW. For epidemiologia used compo is. agnaou processing was made in accordance with the instructions of the magnetic hardening.

Hardening was carried out according to two variants.

1. The magnetization within 5 s and the subsequent demagnetization, combined with epidemiarum for 10 min (declared option).

2. The magnetization combined with epidemiologie for 10 min, and then degauss - 5 (base option).

The results of the testing tool.

The tool was tested 24 h after complete hardening. The processed material - steel 30HGSA.

The test results showed increased wear resistance compared to untreated for all modes of hardening.

Conclusions: the Claimed treatment option compared to the baseline gives stable results improve wear resistance throughout the range of sizes of tool, hardening at the facility. In the baseline revealed a decrease in the wear resistance of tool diameter 60 mm due to the energy loss in magnetization with epilame.


The method of hardening metal-working tools, including tools to complete magnetic saturation, the demagnetization and epidemiologie, the


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