SU872278A1 - Method of ultrasonic dimensional treatment of blind cavities - Google Patents

Description

(54) METHOD OF ULTRASONIC DIMENSIONAL PROCESSING OF DEAF CAVITIES

I

The invention relates to methods of ultrasonic dimensional processing and can be used in the manufacture of products from hard brittle materials, for example, mineraloseraniki, glass, ferrites.

A known method of ultrasonic treatment of deaf cavities is used to press an instrument that oscillates with an ultrasonic frequency to the surface to be treated and a suspension of abrasive powder is fed to the treatment area. The material is removed due to the direct impact of the tool face on the abrasive grains, which make punctures of particles from the treated surface. In this case, the profile of the cavity formed copies the profile of the tool ij.

The closest technical solution to the present invention is a method of ultrasonic dimensional processing of deaf plost, including the introduction of an abrasive slurry into the treatment area and the effect on it of an ultrasonic tool 2.

However, the known methods do not allow to obtain half-depth (5-10 microns) with an accuracy of 1-3 microns in depth. This is due to the fact that during processing a direct impact of the tool’s butt on abrasive grains occurs, as a result of which the latter produce particles that are comparable in size to

10 with a depth of processing cavity. As a result, the micro-relief of the cavity has a non-uniform character.

The purpose of the invention is the provision of treatment of filler cavities

ts depth of 5-10 microns.

Claims (2)

This goal is achieved by the fact that, according to the method of ultrasonic dimensional processing of deaf cavities, including the introduction of an abrasive suspension into the treatment area and the effect on it by an ultrasonic instrument, use an instrument with an area larger than the surface of the cavity. By coating the unworkable surface of the product under the tool end, a coating covering the cavity profile is made of a material adhering to the surface of the product and processed until the coating disappears. The thickness of the coating is 0.3-4.0 times the diameter of the abrasive grain. The drawing shows a device implementing the proposed method. Instrument 1 oscillating ultrasonic frequency with amplitude Ai is pressed with force P to the surface of the product 2 to be machined and has an end area larger than the surface of the product 2 being machined. Under the tool I end there is a coating of the material 3 interlocking with the surface of the product 2 so that it covers the cavity fillet. An abrasive slurry 4 is placed in the treatment area. The ultrasonic treatment method is carried out as follows. The treated article 2 is installed on the table of an ultrasonic machine, to the spindle of which tool 1 is attached, the end area of which is larger than the area of the cavity of product 2. Next, on the unworkable surface of product 2, under the tool end, nan coating 3 of the material adhered to the surface . As this material, you can use paint based on aluminum or broth powder, and apply it using a stencil. Then, an abrasive slurry A, such as diamond paste, is supplied to the treatment area. Instrument} is reported with mechanical vibrations of ultrasonic frequency with amplitude A (5-15 µm) and pressed with a force P (0.1-10 kgf) to the surface 2. At the same time, due to the coating 3, the abrasive grains of the suspension 4 are located on the surface to be treated in several layers Depending on the thickness of the coating, during processing, it is not a direct impact of the end of waveguide 1 through the abrasive grains on the surface to be treated, but a blow through the intermediate grains. This reduces the shock pulse acting on a single grain, and equalizes its value in grains of different Diameter. Due to this, the microgeometry of the bottom of shallow cavities is improved and the accuracy of cavity processing along the contour is increased. At the same time, the depth of the cavity processing and depth accuracy can be adjusted by selecting the abrasive grit and thickness of the coating 3, as well as the great wear of the coating during processing. It was established experimentally that the thickness of the coating 3 during processing should be within 0.3-0, D of the diameter of the abrasive grains. The coating may wear out during processing in whole or in part. Claims of the Invention. A method of ultrasonic dimensional processing of deaf cavities, including the introduction of an abrasive slurry into a treatment zone and an impact on it with an ultrasonic instrument, characterized in that, to ensure the processing of profiled cavities 5-10 microns deep, an instrument with an area larger than that is used cavities, and | On the untreated surface of the product under the end of the tool, a coating covering the profile, cavities, of the material adhering to the surface of the product is applied, and rabotku until disappearance of the coating. 2. A method according to claim 1, characterized in that the coating thickness is 0.3-4.0 times the diameter of an abrasive grain. Sources of information taken into account in the examination. 1. Markov A.I. Ultrasonic cutting difficult materials. M., 1968, p. 21-24. 2. USSR author's certificate 466970, cl. B 22 P 1/00, 1973.