SU706234A1 - Magnetic abrasive working apparatus - Google Patents

Description

  J.

The invention relates to magnetic. abrasive machining and can be used for machining ferromagnetic parts. .

Devices for magnetically abrasive free abrasives are known, located in the working gap between the workpiece surface and moving along it with the aid of the tool 1.

The closest to the technical essence of the invention is a device for magnetic abrasive machining, containing a clamping device in which the Detail j is fixedly mounted. The working tool is fixed on a rotating and returnable spindle moving; The tool is installed relative to the machined surface of the part with a zabbrbm, which contains ferroabrasive grains held in it by magnetic (or electromagnetic): a system located on the tool and creates a magnetic (or electromagnetic) flow that passes through the tool, the working gap and workpiece surface parts.

A disadvantage of this device is the need for additional time for fixing the part.

The aim of the invention is to reduce the auxiliary component of the workpiece by using the flow of a magnetic system to fix it.

This goal is achieved by the fact that the clamping device is made in the form of a glass, the bottom of which contains the base surface for mounting Details, and the walls surround the tool, resulting in a magnetic flux passing along the contour: tool - device - part - working gap - tool.

To increase the reliability of fixing the part, the working surface area of the tool exceeds the Base surface area, so that the magnetic induction of flow through the base surface exceeds the magnetic induction of the current in the working gap and, accordingly, the force of attraction of the part to the fixture is guaranteed more than to the tool. In the drawing, the design of the device on (3ce; iCia devices using permanent magnets. The working tool is made in the form of a flat permanent magnet 1 fixed to the magnetic core 2 and surrounded with a polarization ring 3 from the side surface. The working surface of the tool contains a pole tip 4 Clamping device 5 has walls surrounding the side surface of the tool, and on the inside below the tool they are lined with an insulating screen b, which also covers a part of da, leaving free only the base surface on which the part 7 is installed, the Tool is fixed on the spindle 8, performing auxiliary reciprocating and rectilinear movement and working rotation. The device works in one and two times. When the tool is raised, place the part 7 on the base surface of the tool, and the surface to be machined - the layer of ferroabrasive grains is poured in. Then the spindle is lowered until the working gap between the tool and the part is formed. In this case, the magnetic flux closes and forms a contour; magnet 1 - magnetic core 2 of the wall of fixture 5 - basic -. surface - part 7 - working gap n: polar tip 4 - magnet 1. Spindle rotation is turned on and the surface of the part is polished with grains rotating with InsTpyMeHToivf; The entire magnetic flux created by the magnets passes without loss through the bearing surface of the part, and a part of the flow through the processed surface with dissipation losses, since the area of the working surface of the tool is larger than the workpiece surface. In addition, there is a gap between the part and the tool, and there is no gap between the part and the tool 44. Thanks to these features, the effort of attracting the part to the adaptation is much greater than to the tool. Magnetic flux can also be created using electromagnets. The device according to the invention provides an increase in productivity, since fixing and detaching the part occurs automatically, as well as simplifies the design. Formula 1. The device for magnetically abrasive machining of the fixedly mounted. in which there are ferroabrasive grains held in it by means of a magnetic system creating a magnetic flux, the passage s through the tool, the working air gap, and the treated surface of the part of t n and h as Yusch ee in that in order to reduce the time for installation by the use items. No current of the magnetic system for securing the part, the jig vy-. a glass in the form of a magnetically permeable material, at the bottom of which a base surface is made to install the part, and the walls surround the tool, and an insulating screen is installed on the surfaces of the glass outside the working contact area of the tool and part. 2. The device according to claim 1, wherein, in order to improve the reliability of fixing the part, the area of the base surface of the device does not exceed the area of the working surface of the tool. Sources of information taken into account in the examination 1. Yu. M. Baron. Technology of abrasive processing in a magnetic field. Mechanical Engineering, 1975, p. 9. 2. USSR author's certificate N9.315577. cl. B 24 B 31/10, 1971.