Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
  • B24B1/005—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes using a magnetic polishing agent
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
  • B24B31/003—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor whereby the workpieces are mounted on a holder and are immersed in the abrasive material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
  • B24B31/02—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving rotary barrels

Definitions

• the present invention is an apparatus for cleaning, deburring and polishing parts in magnetic field, which comprises a plastic container implemented as a revolving drum, an electromagnet and an electric motor, and is capable of cleaning, deburring and polishing unit produced or, more particularly, mass-produced machine parts in magnetic field.
• a number of methods for abrasive grinding in magnetic field one of which being the so called barrel deburring method.
• the abrasive parts and the workpieces are loaded into a revolving plastic container, with the ferromagnetic part of the barrel's contents being restrained by magnetic shoes enclosing the rotating barrel.
• the relative velocity of workpieces and abrasive parts can be increased and machining can be made more productive.
• Such a method is disclosed in the document HU 204,217.
• a drawback of the method is that the limited diameter of the barrel restricts the size of parts that can be processed, and loading and emptying the barrel may also pose problems.
• Magnetic deburring and polishing machines are nowadays produced commercially.
• one type of such a machine utilises plastic containers with a diameter of 160-600 mm and a height of 160-540 mm (www.earth-chain.com.tw).
• Magnets of the machine are located below the open-top container on a rotating table, with the ferromagnetic abrasive parts, disposed inside the stationary container, being rotated by the magnetic force exerted on them by the rotating magnets.
• the abrasive parts collide with the non-ferromagnetic workpieces loaded into the container, deburring and polishing them. For the operation of the machine grinding liquid is needed.
• the apparatus is only capable of machining non-ferromagnetic parts, and it can be problematic to sufficiently retain smaller-size parts and to provide for the necessary orientation of larger ones.
• the aim of the present invention is therefore to provide a cleaning, deburring and polishing apparatus that comprises an open-top plastic container and an electromagnet, can be operated automatically, the operation can be easily controlled, the container of the apparatus can be easily loaded with workpieces and abrasive media, and can also be emptied easily.
• the ferromagnetic portion of the contents of the container is rotated by means of a magnetisable disc that is disposed inside the container (which can also be rotated in a controllable way) and is magnetised to the desired extent by means of an electromagnet generating stationary magnetic field.
• Non-ferromagnetic elements in the container conform to the rotation of the container, which means that in case the container is stopped the non-ferromagnetic elements are also brought to a halt.
• the apparatus can be used for machining both ferromagnetic and non-ferromagnetic elements, and only environmentally friendly materials can be utilised as additional media.
• the invention is based on the insight that it is preferable to adjust the relative velocity of the different parts of the contents of the container to meet requirements of changing operating conditions. This can be achieved by ensuring that the rotational speed of the rotating disc and also the magnetisation level thereof can be adjusted continuously, and by providing that the container can be braked and the rotational direction thereof can be reversed. It has also been observed that in a strong magnetic field the conventional deep groove ball bearing can be utilised as a flexible coupling element. This finding can be useful for designing the rotating and braking means of the container of the apparatus, which according to the invention is supported in bearings on a rotating iron core.
• the magnetic transmission element should be disposed in the interior of the container, in the immediate proximity of the parts loaded thereto.
• the inventive goal is achieved by providing an apparatus that comprises a plastic container implemented as a revolving drum, an electromagnet, and an electric motor, and is characterised by that it comprises a magnetisable rotating disc, with said rotating disc being firmly joined to a rotating magnetic core that is disposed inside said plastic container, and further comprises a means for restraining or, (in another implementation), for reversing, the rotation of the container driven by the electric motor.
• a preferred embodiment of the inventive apparatus comprises a spring-actuated braking means, and is characterised by that the container thereof is seated on a magnetisable deep groove ball bearing. After the apparatus has been started, the container soon reaches the rpm n ⁇ of the rotating disc, but the rotational speed of the container can be reduced to an rpm n 2 , or the container can even be brought to a halt, or, in case a reversing mechanism is applied between the axle of the rotating disc and the container, the container and the rotating disc can be rotated into opposite directions.
• Another preferred embodiment of the inventive apparatus comprises a ferromagnetic table supporting the electromagnet and a ferromagnetic ring, with the rotating disc being fitted with an upper and a bottom bearing and being driven through a belt drive by means of an electric motor that is continuously controlled by a variable frequency drive unit, with the apparatus further comprising a DC power supply for adjusting the stationary magnetic field generated by the electromagnet, and the apparatus being characterised by that non-ferromagnetic or ferromagnetic abrasive parts are loaded into the container thereof as abrasive media, depending on whether ferromagnetic or non-ferromagnetic component parts are to be machined by the apparatus.
• a still further preferred embodiment of the apparatus of the present invention is characterised by that the rotating disc thereof has different - smooth or cogged - perimetric configuration depending on the shape of the parts to be machined by the apparatus.
• wheat or corn flour is loaded into the container thereof as additional abrasive media.
• Fig. 1 is the schematic view of the apparatus according to the invention
• Fig. 2 shows the configuration of the container of the inventive apparatus in the case where non-ferromagnetic parts are machined.
• the apparatus shown in Fig. 1 consists essentially of a plastic container 5, a magnetisable rotating disc 3, a braking means 6, a rotating iron core 10, a deep groove ball bearing 4, an electromagnet 7, an electric power supply 16, a ferromagnetic table 9, a ferromagnetic ring 8, an upper bearing 11 , a bottom bearing 13, an electric motor 15, a variable frequency drive unit 14, a belt drive 12, ferromagnetic parts 2 and non-ferromagnetic abrasive parts 1 , with said ferromagnetic parts 2 and non-ferromagnetic abrasive parts 1 being loaded into said container 5.
• Figures 1 and 2 show an embodiment of the inventive apparatus that is suitable for cleaning, deburring and polishing ferromagnetic or non-ferromagnetic parts of small or medium size.
• the plastic container 5 is loaded from above with ferromagnetic parts 2 or non- ferromagnetic parts 17 and, depending on whether ferromagnetic 2 or non- ferromagnetic 17 parts are to be machined, non-ferromagnetic abrasive parts 1 (made of aluminium-oxide) or ferromagnetic abrasive parts 18 (made of corrosion-resistant steel) are also loaded into the container 5.
• non-ferromagnetic abrasive parts 1 made of aluminium-oxide
• ferromagnetic abrasive parts 18 made of corrosion-resistant steel
• Other materials may also be loaded into the container: in case of dry machining preferably wheat or corn flour can be utilised, while in case of wet machining a conventional, preferably environmentally friendly surface- active fluid is desirable as an additive.
• a stationary magnetic field is generated by the electric power supply 16 and the electromagnet 7 and the intensity of the field is adjusted to the desired level.
• the path of the magnetic lines of force closes through the rotating iron core 10, the magnetisable rotating disc 3, the ferromagnetic parts 2, the ferromagnetic ring 8 and the ferromagnetic table 9.
• the container 5 becomes flexibly joined to the rotating iron core 10 by the deep groove ball bearing 4 that consists of magnetisable parts.
• the container 5 is set into rotary motion by the electric motor 15 via the belt drive 12.
• the desired rpm n-i can be adjusted using the variable frequency drive unit 14. Due to the centrifugal force arising because of the rotation of the container 5, the contents thereof will soon be located in the vicinity of the side walls, but no material is severed from the parts at this point.
• the velocity difference between work-pieces and abrasive parts which is necessary for abrasive action is brought about through the braking means 6 that is used to adjust the rpm n 2 ( ⁇ n ⁇ ) of the container. It should be noted that in certain cases it might become necessary to rotate the disc 3 and the container 5 into opposite directions. This can be achieved simply by means of a reversing mechanism.
• the machining process finishes after the parts have become cleaned, deburred, or polished, which can be ascertained either by (ocular) inspection or by measurement. Finished parts are removed from the container 5 in the conventional way by taking them out manually or using a vacuum device, and are separated according to a known art method (e.g. magnetic or centrifugal separation).
• a known art method e.g. magnetic or centrifugal separation
• Fig. 2 illustrates how non-ferromagnetic work-pieces are located inside the container 5 during the operation of the inventive apparatus.
• ferromagnetic abrasive parts 18 are applied, which rotate together with the rotating disc 3 while the rotational speed of the non-ferromagnetic parts 17 is nearly equal to the speed of the container 5.
• the apparatus speeds up the finishing process, is cost-effective, can be controlled easily, and can be applied for machining both ferromagnetic and non-ferromagnetic parts.
• non-ferromagnetic abrasive parts ferromagnetic parts rotating disc deep groove ball bearing container braking means electromagnet ferromagnetic ring ferromagnetic table rotating magnetic core upper bearing belt drive bottom bearing variable frequency drive unit electric motor power supply non-ferromagnetic parts ferromagnetic abrasive parts

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Applications Claiming Priority (5)

Publications (2)

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• 2003
  • 2003-08-27 AU AU2003263375A patent/AU2003263375A1/en not_active Abandoned
  • 2003-08-27 AT AT03791068T patent/ATE340052T1/de not_active IP Right Cessation
  • 2003-08-27 DE DE60308536T patent/DE60308536T2/de not_active Expired - Lifetime
  • 2003-08-27 EP EP03791068A patent/EP1545834B1/de not_active Expired - Lifetime
  • 2003-08-27 WO PCT/HU2003/000068 patent/WO2004020144A1/en active IP Right Grant

Non-Patent Citations (1)

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