Method for ultrasonic finish processing of parts from structural and tool steel and device for its implementation

FIELD: machine building.

SUBSTANCE: part is rotated and its surface is processed by an ultrasonic finish processing device with a deforming element. The ultrasonic finish processing device with a deforming element is moved along the part, is imparted with ultrasonic vibrations and multiple shock treatment by the deforming element is carried out with the ultrasonic frequency of 20 kHz and amplitude of 5-40 mcm. Herewith the deforming element and the part are partially immersed in the bath with kerosene to cool the processed part surface thus providing for the creation of gradient submicro- and nanocrystalline structures on it.

EFFECT: high strength and hardness of the part surface.

4 cl, 6 dwg, 1 ex

 

The invention relates to the field of engineering, in particular to finishing using the energy of ultrasonic vibrations.

The closest in technical essence to the invention according to claim 1 is a method of ultrasonic finishing treatment (patent RF №2393076, B24B 39/04, B06B 1/00, publ. 27.06.2010, bull. No. 18), including rotating parts and the effects on the surface of the device with a deforming element which is moved along the details and ask him ultrasonic vibrations.

The closest in technical essence to the invention of claim 2 is the device for ultrasonic ProcName-surface finishing (RF patent No. 2124430, B24B 39/00, B24B 1/04, publ. 10.01.1999), including mounted in the housing magnetostrictive transducer, connected to a hub on the end part of which is assigned a deforming element and the transducer vibrations.

A disadvantage of the known method and device is the allocation of considerable heat, raising the temperature of the processed material in the deformation zone up to 800-1000°C, i.e. in the contact zone of the deforming element (indenter) and the treated surface, and, as a consequence, the evolution of nanostructures, followed by a deterioration of physical, chemical and mechanical properties.

The technical result of the proposed solutions is about what the provisions of the conditions of heat exchange with the environment, when the temperature of the treated surface of the metal does not exceed the threshold thermal stability of nano - and submicrometer, when this was achieved the high strength and hardness.

The technical result according to claim 1 and claim 2 is due to the fact that you are doing the rotating parts and the effects on the surface of the device for ultrasonic finishing treatment with deforming element, which is moved along the workpiece, ask him ultrasonic vibrations and carry out multiple shock processing of deforming element. In this case shock processing of deforming element is performed with ultrazvukovoy frequency is about 20 kHz and an amplitude of 5-40 μm, at the same time carry out or partial immersion of the deforming element and the workpiece in a bath of kerosene for cooling the workpiece part, providing it a gradient submicro - and nanocrystalline structures, or the cooling of the workpiece to obtain it these structures using thermally conductive nozzle made of aluminum with a heat-repanium contributing to the increase in the area of teplootdachi machined tool, thus to reduce thermal contact resistance between the conductive nozzle and the surface you apply octopodidae lubrication. Otherwise, if the contact resistance is large, it may negate the effectiveness of the heat sink.

The technical result according to claim 3 and claim 4, for a device containing magnetostrictive or piezotronic Converter connected to the hub-waveguide, on the end part of which is assigned a deforming element (indenter) is achieved by the fact that it is further provided with, or a liquid cooling system in the form of baths with kerosene made with the possibility of partial immersion in it deforming element and the part or thermally conductive nozzle with heat-repanium, made of aluminum, which is designed for cooling the workpiece part, providing it a gradient submicro - and nanocrystalline structures.

The invention is illustrated by the following drawings and photographs:

- figure 1 - external view of the device for ultrasonic pulse hardening of the outer surface of rotating on a lathe;

- figure 2 is an external view of the device for ultrasonic pulse hardening of the surface of the flat parts on a milling machine.

- 3 - heat-conducting nozzle made of aluminium for heat dissipation from the contact detail of the indenter with ouzo.

- figure 4 - structure of the surface layer article 45 after processing and ouzo with liquid cooling.

- figure 5 - structure of the surface layer article 45 after treatment ouzo with cooling the coolant.

- 6 - dependence of micro-hardness steel article 45 from the static load and the type of cooling.

The device includes a hub-waveguide, magnetostrictive or piezotronic Converter, machine, device, fixing the probe to a support plate of the machine, deforming element, and a liquid cooling system or heat-conducting nozzle.

The working principle is the following. The current supplied to the coil of the transducer from the electronic generator and converted into mechanical energy (ultrasonic) vibrations of the same frequency. High-frequency electric current passing through the coil generates an alternating magnetic field, under the influence of varying the Converter, the Converter attach special hub-waveguide to the end face of the waveguide is attached to the tool - indenter. The tool, along with the entire oscillatory system press firmly to the surface of a rotating workpiece material. Is repeated processing of deforming element with an ultrasonic frequency of 20 kHz, with an amplitude of 5-40 microns. The surface plastically deformed and hardened (Fig 1). For cooling crumple zones using a liquid cooling system treatment is tivemos surface and the working tool, i.e. is partial immersion in a bath, for example, kerosene, resulting in the removal of heat is in the process of boiling on the surface to be cooled and the coolant flows is due to the difference of densities. Instead of the liquid cooling system may use a heat-conducting nozzle made of aluminium (figure 2), thus to reduce thermal contact resistance between the metal nozzle and the workpiece surface used vysokoteploprovodnyh grease.

The claimed invention surface hardening ultrasonic treatment (RCD) massive parts of the hardened structural and tool steels allows to obtain high hardness and strength by creating nanocrystalline with a grain size of 5-10 nm at a depth of 15-20 microns from the surface and submicrocrystalline structure at a depth of 250-300 microns from the surface.

The example implementation.

An experimental study of the influence of cooling with ouzo on the properties of article 45. Processing of experimental flat samples was carried out on a universal milling machine, on the caliper which was recorded ultrasonic instrument. In the course of the experiment at constant amplitude, linear speed, feed rate and the diameter of the sphere of work and the instrument of varied static load and type of cooling (air, natural, natural liquid combined). From figure 4 it is seen that when using liquid cooling is more highly dispersed structure than when using coolant (figure 5). Application in the technological scheme ouzo liquid cooling allows to increase the layer of thin nanocrystalline structure on the details of any size and any geometry to 20-25 microns. While the microhardness increases the greater, the more efficient the cooling method (Fig.6).

1. The ultrasonic method of finish machining of structural and tool steels, including the rotating parts and the effects on the surface of the device for ultrasonic finishing treatment with deforming element, which is moved along the workpiece, ask him ultrasonic vibrations and carry out multiple shock processing of deforming element, characterized in that the shock processing of deforming element is performed with an ultrasonic frequency of 20 kHz and an amplitude of 5-40 μm, while carry out cooling of the workpiece part, providing it a gradient submicro - and nanocrystalline structures by partial immersion of the deforming element and the workpiece in a bath of kerosene.

2. The method of ultrasonic finishing parts of the structural and Ann is rimentally steels, including rotating parts and the effects on the surface of the device for ultrasonic finishing treatment with deforming element, which is moved along the workpiece, ask him ultrasonic vibrations and carry out multiple shock processing of deforming element, characterized in that the shock processing of deforming element is performed with an ultrasonic frequency of 20 kHz and an amplitude of 5-40 μm, while carry out cooling of the workpiece part, providing it a gradient submicro - and nanocrystalline structures by conducting heat through the heat-conducting nozzle with heat-repanium, made of aluminum, and between the workpiece surface and the heat-conducting nozzle use vysokoteploprovodnyh grease.

3. Device for ultrasonic finishing machining of structural and tool steels the method according to claim 1, containing piezotronic Converter connected to the hub-waveguide, on the end part of which is assigned a deforming element, and a liquid cooling system in the form of baths with kerosene made with the possibility of partial immersion in it deforming element and the workpiece.

4. Device for ultrasonic finishing treatment of parts made to struction and tool steels method according to claim 2, containing magnetostrictive or piezotronic Converter connected to the hub-waveguide, on the end part of which is assigned a deforming element, and a thermally conducting attachment with the heat repanium made of aluminum.



 

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