Patent Grant
11260494
This application is a national stage entry from International Application No. PCT/M2019/054380, filed on May 27, 2019, in the Receiving Office (“RO/IB”) of the International Bureau of the World Intellectual Property Organization (“WIPO”), and published as International Publication No. WO 2019/229631 A1 on Dec. 5, 2019; international Application No. PCT/IB2019/054380 claims priority from Italian Patent Application No. 102018000005751, filed on May 28, 2018, in the Italian Patent and Trademark Office (“WTO”), the entire contents of all of which are incorporated herein by reference.
The present invention relates to a device for surface finishing of parts. Such device is useful in particular in the last steps of industrial productions to provide a specific surface finishing to a mechanical component. More in detail, the device subject of the present invention can be used to carry out working processes as for example deburring, grinding, polishing and even more.
It is known in the state of the art a device for surface finishing of parts. Such device comprises a substantially toroidal-shaped container open on top. A motor adapted to cause the vibration of the container itself is installed at the base of the container.
In order to carry out the working process, the container is filled with a plurality of solid fragments, called “media” in the technical jargon of the field. Such media are selected based on shape, size and level of abrasiveness according to the working process to be carried out. Optionally, a liquid additive can be inserted together with the media.
To carry out the treatment, one or more parts are inserted into the container together with the media such that, once the motor is actuated, the repeated friction between the parts and media and the subsequent grinding give each part the required surface finishing.
The above described machine and process have been employed for a long time with satisfactory results. It is noted, however, that when parts have holes or cavities this type of processing is difficult, resulting in a lengthening of working times, as, in order to obtain the same type of finishing it is required to leave components inside the machine for a longer time.
Furthermore, while finishing several parts simultaneously, these tend to adhere between them. This occurs especially in case parts have plane surfaces and with the presence of water in the container together with the media, which is often required in many working processes.
Document U.S. Pat. No. 4,081,929 is further known in the art. The device is used for finishing parts by means of using draining means for removing fluids, dust and small-size particles from the working system. Such device has a single projection adapted to remove fluids and dust.
In this background, the technical task underlying the present invention is to propose a device for surface finishing of parts that overcomes the aforementioned drawbacks of the prior art.
In particular, it is an object of the present invention to make available a device for the surface finishing of parts that is able to improve the finishing of parts having holes, cavities or similar features.
A further object of the present invention is to make available a device for surface finishing of parts able to prevent parts from adhering between them during treatment.
Another object of the present invention is to make available a device for surface finishing of parts able to reduce working times with parts being equally finished.
The defined technical task and the specified objects are substantially reached by a device for surface finishing of parts comprising the technical characteristics set forth in one or more of the enclosed claims.
In particular, one embodiment of a device for surface finishing of parts according to the present invention comprises an annular container. Such container is configured to receive a plurality of working media and at least a part to be treated. The container has a central axis and a bottom surface.
The device further comprises vibratory means associated with the container. Such vibratory means are intended to cause the container to oscillate. Furthermore, vibratory means are arranged to cause the part to circulate inside the container along a pre-established feeding path.
The bottom surface of the container has a plurality of projections preferably angularly equally spaced between them with respect to the central axis. Such projections are configured to change the spatial orientation of the part as it moves thereon.
Advantageously, the device according to the invention limits adhesions during the working step. While two adhering components move on a projection, in fact, each will be re-oriented in a different and substantially casual way. This makes it possible for the adhesion to be broken soon after being formed, thus avoiding a negative effect on the working process.
Such device further allows to process efficiently pieces with cavities or holes as, while moving on the projections, the spatial orientation of the part is changed. Consequently, media are periodically inserted and/or removed from the cavity or the hole, exerting their abrasive action with a greater continuity also inside parts that are difficult to reach as for instance cavities or holes.
Finally, it must be noted that projections promote a higher randomness in media movement with respect to the part. This results in a higher evenness of surface processing, which leads to a working process time even lower of 30% with respect to the machines of the known art, the result being equal.
Further characteristics and advantages of the present invention will appear more evident from the indicative and non-limiting description of a preferred but not exclusive embodiment of a device for surface finishing of parts, as illustrated in the enclosed drawings wherein:
Referring to the enclosed figures, a device for surface finishing of parts according to the present invention is indicated by 1.
Referring in particular to
The device 1 comprises an annular container 2, having a central axis “A” and a bottom surface 3. In particular, the container 2 is fixed to the above-mentioned movable platform 15. Such container 2 is adapted to receive one or more parts to be treated. To this end, the container 2 is configured to receive a plurality of working media. In the background of the present invention, “medium” means a solid element adapted to react with each part through friction and/or rubbing. Working media are selected according to their physical properties, in particular shape, size and degree of abrasiveness, according to the specific working process to be implemented.
In greater detail, container 2 has one first inner lateral surface 2a surrounding one second inner lateral surface 2b. Such inner lateral surfaces 2a, 2b each have a respective bulge. Such bulges each define a respective inner concavity inside the container 2.
Referring in particular to
The device 1 further comprises vibratory means 4, which are associated with container 2 such as to cause it to oscillate. Vibratory means 4 are configured to cause the part inside the container to circulate along a feeding path “P”. In particular, the path “P” is preferably a toroidal-spiral path, i.e. it makes up a circular motion lying on a radial plane of container 2 and a movement along directions tangential to the container 2 itself. In other words, the path “P” is given by a movement of the part along inner lateral surfaces 2a, 2b and the bottom surface 3 of the container 2.
In greater detail, the device comprises a housing 9 in a single piece with the container 2, where the aforementioned vibratory means 4 are housed. The housing 9 has a cylindrical shape, and it is placed inside the toroidal ring defined by the container 2. In particular, the housing 9 is defined by a cylindrical wall 10 arranged coaxially with respect to the central axis “A” of container 2.
In further detail, vibratory means 4 comprise a motor 11 actuating, by means of a shaft 12, a torque of eccentric masses 13. The motor 11 is in particular fixed to the cylindrical wall 10 of the housing 9, so as to transmit to container 2 the vibration generated by the rotation of the eccentric masses 13.
Referring in particular to
In one first embodiment of the invention, the bottom surface 3 has a number of projections 5 between two or more, in particular between two and six, preferably four. In alternative embodiments, not shown, the number of projections 5 can be any and, in particular, it can vary also according to the sizes of the container 2.
In detail, each projection 5 has a crest 5a. Such crest 5a develops along a radial direction “R” identified by the projection 5, i.e. a direction that joins the projection 5 with the central axis “A”. Furthermore, crest 5a has a height between 50% and 80% of the height of the container 2 with respect to the bottom surface 3.
According to a preferred embodiment of the invention, the crest 5a has an inclination along the radial direction “R”, in particular descending towards the center of the container 2 passed through by the central axis “A”. Preferably, the crest 5a is inclined at an angle “I” less than 40°. Advantageously, the crest 5a inclination eases the rotation of the part, and allows to further reduce working times.
Each projection 5 has an ascending lateral surface 5b, which extends from the bottom surface 3 of the container 2 up until the crest 5a. Similarly, a descending lateral surface 5c extends from the crest 5a down until the bottom surface 3. It must be noted that lateral surfaces 5b, 5c have a descending inclination from the crest 5a down until the bottom surface 3.
The ascending lateral surfaces 5b and descending lateral surfaces 5c are so called as, in use, parts introduced in the container 2 overcome the projections 5 moving up along ascending lateral surfaces 5b and down along the descending lateral surfaces 5c of each projection 5. In greater detail, vibratory means 4 are configured to move the container 2 with an eccentric movement with respect to the central axis “A” according to one first rotation direction, thus feeding the part into the container 2 along the aforementioned path “P”, in particular towards the projection 5 where an irregular movement of the part occurs making it possible to obtain the previously described advantages.
In greater detail, lateral surfaces 5b, 5c generally have a different inclination with respect to the bottom surface 3. In particular, the ascending lateral surface 5b has an inclination that ranges from 30° to 70°. The descending lateral surface 5c has an inclination that ranges from 40° to 70°. It must also be noted that the descending lateral surface 5c can be vertical.
According to one embodiment of the invention, the container 2 is provided with a plurality of holes (not shown) placed at the bottom surface 3. In particular, each hole is arranged between two respective projections 5. Each hole is provided with a valve (not shown) such that it can be opened/closed to allow or prevent the passage of fluid.
When the device 1 is in use, vibratory means 4 are actuated, such that the container 2 is put into vibration. The part is thus fed into the container up until it reaches the ascending lateral surfaces 5b of the projections 5 and is moved down along the descending lateral surfaces 5c.
In case the processing to be carried out envisages the use of a liquid additive together with the media, it is possible to selectively open or close each of the holes according to pre-established modes. In case the hole between two projections 5 is open, the liquid present therebetween is drained, while in the opposite case it is retained inside the container 2. Thanks to holes and projections 5, it is possible to implement a treatment in which parts alternatively move in tanks containing both liquid and media and in tanks containing only media.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102018000005751 | May 2018 | IT | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB2019/054380 | 5/27/2019 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2019/229631 | 12/5/2019 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 3071900 | Balz | Jan 1963 | A |
| 3848373 | Pletscher | Nov 1974 | A |
| 4081929 | Jones et al. | Apr 1978 | A |
| 4184290 | Rampe | Jan 1980 | A |
| 4205491 | Nishiya | Jun 1980 | A |
| 4757648 | Carpenter | Jul 1988 | A |
| 5237778 | Baer | Aug 1993 | A |
| Number | Date | Country |
|---|---|---|
| 0225417 | Jun 1987 | EP |
| 2027372 | Feb 1980 | GB |
| Entry |
|---|
| International Search Report and Written Opinion in corresponding International Application No. PCT/IB2019/054380 dated Sep. 10, 2019, 10 pages. |
| Number | Date | Country | |
|---|---|---|---|
| 20210205947 A1 | Jul 2021 | US |
