DE60308536T2 - DEVICE AND METHOD FOR CLEANING, DEBURRING AND POLISHING PARTS IN THE MAGNETIC FIELD - Google Patents

Abstract

The object of the invention is an apparatus for cleaning, deburring and polishing parts in magnetic field, comprising a plastic container (5), an electromagnet (7), and an electric motor (15), with the plastic container (5) being implemented as a revolving drum. The inventive apparatus is characterised by that it comprises a magnetisable rotating disc (3) and a rotating core (10) disposed inside the container (5), with the rotating disc (3) being firmly joined to said magnetic core (10), and further comprises a braking means (6) for restraining the rotation of the container (5) driven by the electric motor (15).

Description

Territory of invention

The The present invention is both an apparatus according to claim 1 and a method according to claim Third

description of the prior art

modern Manufacturing technology processes need uniform requirements in terms of reliability, accuracy, productivity and cost-effectiveness sufficient being the lowest possible Generate environmental pollution. Cleaning, deburring and polishing processes are no exception.

There are a number of methods known in the art for cleaning, deburring and polishing machine parts, with abrasive grinding techniques such as revolving drum techniques, vibratory and centrifugal techniques being among the most widely used (W. König, Közörülés, dörzsköszörülés, tükrösités [Grinding , honing, lapping methods], Budapest, Műszaki Könyvkiadó 1983). In all of these methods, the processing takes place in a special container using liquid additives, wherein the disordered movement of grinding parts or abrasive particles is exploited. Individual processes differ mainly in their productivity and the size of the parts that can be processed (see description DE2408359A ).

The productivity Known method can be achieved by performing the processing in one Magnetic field increased Be what else a possibility offers, parts from non-conventional Materials or not conventional To edit geometry.

There have been proposed a number of methods for abrasive grinding in a magnetic field, one of which is the so-called drum deburring method. According to this method, the grinding parts and the workpieces are loaded into a circulating plastic container, wherein the ferromagnetic part of the contents of the drum is held by magnetic shoes surrounding the rotating drum. Thus, the relative speed of workpieces and grinding parts can be increased, whereby the machining can be made more productive. One such method is in the document HU 204,217 disclosed. A disadvantage of this method is that the limited diameter of the drum limits the size of parts that can be processed, and the loading and unloading of the drum can also add to problems. The applicable speed and relative speed of workpieces and grinding parts is greatly affected by the magnetic field strength, which decreases as the drum diameter is increased.

magnetic Deburring and polishing machines are commercially produced today. For example, one type of such machine uses plastic containers a diameter of 160-600 mm and a height from 160-540 mm (www.earth-chain.com.tw). The magnets of the machine are located below the open container on a rotating table, wherein the arranged in the stationary container ferromagnetic grinding parts by those of the rotating magnets on she exercised magnetic force to be turned. The grinding parts collide the loaded into the container non-ferromagnetic workpieces together and deburr and polish them. For the operation of the machine becomes a grinding fluid benötig. The device can only handle non-ferromagnetic parts, where it can be problematic to hold smaller parts sufficiently and to ensure the required alignment of larger parts.

Besides, they are other solutions for magnetic deburring available, z. One of W. R. Lovness and J. F. Feldhaus (German patent filed on 19.02.1974; Machine for cleaning, grinding and polishing objects) the magnetizable grinding parts (grains) by a rotating Magnetic field outside the container generated is moved between the freely moving workpieces. According to one another solution The grinding parts are suitably arranged magnetic shoes held in the rotating container, wherein the individually secured workpieces through the grinding parts Shinmura, E. Hatano, K. Takazawa, "Development of Spindle-Finishing Type Finishing Apparatus and Its Finishing Performance Using a Magnetic Abrasive Finishing Process ", Bull. Japan Soc. of Prec. Eng., Vol. 20, No. 2, June 1986). The problems with the first method are similar to the mentioned disadvantages of the list above, It should be noted that as well the generation of a rotating magnetic field in a container with larger diameter problematic can be. Because the workpieces individually, the productivity of the second solution is relative lower, but among its advantages, that they are equally ferromagnetic and can process non-ferromagnetic parts (see specification US-A-4730418).

The in the document US4730418 The device described is suitable for cleaning, deburring and polishing parts in a magnetic field, and comprises a non-magnetic container, which a rotating drum is implemented, an electromagnet, an electric motor, a magnetizable rotating disk, a table supporting the electromagnet and a ferroelectric ring and ensuring the closing of the magnetic lines of force; wherein the rotating disc is mounted on an upper bearing and a lower bearing and driven by a belt drive by means of an electric motor; wherein it further comprises a power supply to adjust the stationary magnetic field generated by the electromagnet.

Task of invention

The The aim of the present invention is therefore to provide a cleaning, Deburring and polishing device and a method that solves the problems, those with devices according to the state the technique occur.

Of the ferromagnetic part of the contents of the container is by means of a magnetizable Slice turned in the container (besides can be rotated in a controllable manner) is arranged and the by an electromagnet which generates a stationary magnetic field, in the desired scope is magnetized. Non-ferromagnetic elements in the container will fit the rotation of the container on, which means that the non-ferromagnetic elements in the event that the container stopped will be brought to a standstill as well. The device can used to be both ferromagnetic and non-ferromagnetic Elements to edit, using only environmentally friendly materials as additional Media can be used.

The The invention is based on the insight that it is desirable to have the relative speed the various parts of the contents of the container to set the Requirements changing Operating conditions to meet. This can be achieved by ensuring that the speed of the rotating disk and as well their magnetization level can be adjusted continuously, and by providing that the container can be braked and its direction of rotation can be reversed. It is also observed been that in a strong magnetic field, the conventional Deep groove ball bearings are used as a flexible coupling element can. This result can be for the construction of the rotating means and the braking means of the container Device useful which are supported in bearings on a rotating iron core can. The magnetic transmission element (the magnetizable disk) can be found inside the container the immediate vicinity be arranged in the charged parts.

Consequently becomes the goal of the invention by providing a device according to claim 1 and a method reached from claim 3.

preferred embodiments of the invention are in the dependent claims Are defined.

Summary the drawing

A embodiment the device according to the invention will now be described by way of example only with reference to the accompanying drawings in detail described, wherein:

1 the schematic view of the device according to the invention; and

2 shows the configuration of the container of the device according to the invention in the case in which non-ferromagnetic parts are processed.

Full Description of the invention

In the 1 The device shown essentially consists of a plastic container 5 , a magnetizable rotating disk 3 , a braking means 6 , a rotating iron core 10 , a deep groove ball bearing 4 , an electromagnet 7 , a power supply 16 , a ferromagnetic table 9 , a ferromagnetic ring 8th , an upper camp 11 , a lower camp 13 an electric motor 15 , a drive unit 14 with variable frequency, a belt drive 12 , ferromagnetic parts 2 and non-ferromagnetic grinding parts 1 , where the ferromagnetic parts 2 and the non-ferromagnetic grinding parts 1 in the container 5 are loaded.

When the device is used to non-ferromagnetic parts 17 to process, the container becomes 5 with ferromagnetic grinding parts 18 loaded, as in 2 is shown.

The 1 and 2 show an embodiment of the device according to the invention, which is suitable for cleaning, deburring and polishing of ferromagnetic or non-ferromagnetic parts of small or medium size.

The Operation of the device according to the invention will now be detailed described.

The container 5 becomes from above with ferromagnetic parts 2 or non-ferromagnetic parts 17 loaded, depending on whether ferromagnetic parts 2 or non-ferromagnetic parts 17 are to be processed, also not ferromagnetic grinding parts 1 (made of aluminum oxide) or ferromagnetic grinding parts 18 (Made of corrosion resistant steel) in Be container 5 getting charged. In addition, other materials may be loaded into the container: in the case of dry processing, wheat or corn starch may preferably be used, whereas in the case of wet processing, a conventional, preferably environmentally friendly, surface active fluid is desirable as an additive.

After the container has been refilled, it is powered by the power supply 16 and the electromagnet 7 generates a stationary magnetic field and the intensity of the field is set to the desired level. The path of the magnetic lines of force closes over the rotating iron core 10 , the magnetizable rotating disc 3 , the ferromagnetic parts 2 , the ferromagnetic ring 8th and the ferroelectric table 9 , After the magnetic field has been formed, the container becomes 5 through the deep groove ball bearing 4 , which consists of magnetizable parts, flexible with the rotating iron core 10 connected.

To ensure that the contents of the container 5 (the parts to be processed) is evenly distributed, the container becomes 5 through the electric motor 15 over the belt drive 12 put in a rotary motion. Using the drive unit 14 With variable frequency, the desired speed n ₁ can be set. Because of the centrifugal force due to the rotation of the container 5 occurs, its contents are quickly placed near the side walls, but at this point no material is separated from the parts. The speed difference between workpieces and grinding parts, which is necessary for a grinding action, is via the braking means 6 , which is used to set the speed n ₂ (<n ₁ ) of the container, brought about.

Experiments have shown that it can be advantageous for machining parts of certain special shapes, the rotating disk 3 with a non-cylindrical (eg toothed) peripheral configuration.

The machining process ends after the parts have been cleaned, deburred or polished, which can be determined either by an (eyepiece) test or by a measurement. Finished parts are removed from the container in a conventional manner 5 by taking them out by hand or using a vacuum device, separating them according to a method known in the art (e.g., magnetic or centrifugal separation).

2 illustrates how non-ferromagnetic workpieces in the container 5 are arranged during operation of the device according to the invention. In this case, grinding parts 18 applied, which together with the rotating disk 3 rotate, the speed of the non-ferromagnetic parts 17 approximately equal to the speed of the container 5 is.

To ensure that parts are evenly cleaned, deburred and polished, it may be necessary to change the contents of the container 5 occasionally rearrange. This can be achieved by simply turning the magnetic field on and off automatically from time to time, or alternatively reversing the direction of rotation of the device.

Under the main advantages of the device according to the invention should be mentioned, that the device speeds up the completion process, economically is, can be easily controlled and applied to both ferromagnetic and non-ferromagnetic parts too to edit.

1

Not ferromagnetic grinding parts

2

ferromagnetic parts

3

rotating disc

4

Deep groove ball bearings

5

container

6

braking means

7

electromagnet

8th

ferromagnetic ring

9

ferromagnetic table

10

rotating magnetic core

11

upper camp

12

belt drive

13

lower camp

14

drive unit with variable frequency

15

electric motor

16

power supply

17

Not ferromagnetic parts

18

ferromagnetic grinding parts

Claims (5)

Device capable of cleaning, deburring and polishing parts in a magnetic field, comprising a plastic container ( 5 ), which is implemented as a revolving drum, an electromagnet ( 7 ), an electric motor ( 15 ), a magnetizable rotating disk ( 3 ) equipped with a rotating magnetic core ( 10 ) contained in the container ( 5 ) is fixedly connected, and a braking means ( 6 ), the rotation of the by the electric motor ( 15 ) driven container ( 5 ), the container ( 5 ) on a magnetizable deep groove ball bearing ( 4 ), wherein the deep groove ball bearing ( 4 ) also serves as a coupling element, such that by the braking means ( 6 ) the speed of the container ( 5 ), which was originally equal to the speed n _{1 of} the rotating disk ( 3 ) is on a speed n ₂ can be reduced or the container ( 5 ) can even be stopped during operation of the device; furthermore with a table ( 9 ), the electromagnet ( 7 ) and a ferromagnetic ring ( 8th ) and ensures the closing of the magnetic force lines; the rotating disc ( 3 ) at an upper warehouse ( 11 ) and at a lower camp ( 13 ) and via a belt drive ( 12 ) by means of a drive unit ( 14 ) with variable frequency controlled electric motor ( 15 ) is driven; and further with a DC power supply ( 16 ) by the electromagnet ( 7 ) set stationary magnetic field generated. Device according to claim 1, characterized in that the braking means ( 6 ) is a spring-actuated brake means. Method for cleaning, deburring and polishing parts with the device according to claim 1 or 42, characterized in that in the container ( 5 ) as grinding media non-ferromagnetic grinding parts ( 1 ) or ferromagnetic grinding parts ( 18 ), depending on whether ferromagnetic components ( 2 ) or non-ferromagnetic components ( 17 ) are to be processed by the device. Method according to claim 3, characterized in that the rotating disk ( 3 ) has a different peripheral configuration - smooth or serrated - depending on the shape of the parts to be machined by the device. Method according to one of claims 3 or 4, characterized in that in the container ( 5 ) is loaded as an additional medium wheat or corn starch.