EP2857144B1 - A machine for drag finishing of mechanical parts - Google Patents

A machine for drag finishing of mechanical parts Download PDF

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Publication number
EP2857144B1
EP2857144B1 EP14185788.8A EP14185788A EP2857144B1 EP 2857144 B1 EP2857144 B1 EP 2857144B1 EP 14185788 A EP14185788 A EP 14185788A EP 2857144 B1 EP2857144 B1 EP 2857144B1
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EP
European Patent Office
Prior art keywords
group
rotating
tub
machine
carrying element
Prior art date
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Active
Application number
EP14185788.8A
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German (de)
English (en)
French (fr)
Other versions
EP2857144A1 (en
Inventor
Paolo Redaelli
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Individual
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Individual
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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
    • 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
    • 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
    • B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies

Definitions

  • the present invention relates to a machine for drag-finishing mechanical parts.
  • the mass finishing of metal surfaces is based on the dynamics relating to the way in which the mass constituted by the finishing media and the parts is set in relative motion.
  • the parts to be worked are fixed to appropriate support devices such as part-carrying chucks.
  • the parts are circularly drawn, at a high speed, internally of a treatment tub in which a finishing media is present, which can be constituted by components such as, for example, abrasive granules having an appropriate shape, made of polymer, ceramic, plastic, synthetic materials or materials of natural origin.
  • the working is generally done at high speed, giving rise to a certain contact pressure between the part to be worked and the working means which leads to the desired result.
  • the parts are mounted on a rotating head which exhibits a plurality of part-carrying groups, each constituted by a chuck which is able, in turn, to house a plurality of parts positioned along a circumference thereof.
  • a machine of the described type can comprise a rotating head provided with three part-carrying chucks, each of which is able to support 12 parts.
  • the machine can be set in motion, by rotating the rotating head in a rotation direction, while the part-carrying chucks can be rotated in an opposite direction.
  • a control panel enables setting various functioning parameters of the machine.
  • Machines of this type though enabling carrying the parts in an offset position with respect to the centre of the tub, are obviously hampered by a high degree of constructional complexity, as among other things it is necessary to mount gearings able to give the above-described complex planetary motion to the parts being worked in the tub.
  • a further not insignificant functional aspect of this type of machine is correlated to the loading operation in the rotating tub and the unloading operation in the finishing media (granulates or the like).
  • this operation can be necessary when a different working operation is to be carried out, for example passing from titanium parts to stainless steel parts, and the media used in the preceding work operations is not to be used again.
  • Document EP 0 073 536 discloses a finishing machine for pieces immersed in tub containing finishing media.
  • Means are provided to transport the pieces to be finished from a loading and unloading station to a working position where the pieces are immersed in the tub and contacting the finishing media.
  • the transport means comprise a first piston-cylinder group capable of moving along a vertical axis, for example in order to immerse a piece in the tub and a second piston-cylinder group capable of moving along a horizontal axis.
  • the pieces to be finished are carried by a part-carrying element, from a loading station, then are lifted along the vertical by the first piston-cylinder group up to an height higher than the border of the tub.
  • the first piston-cylinder group immerses the pieces in the tub by means of a movement along the vertical direction and, when the pieces are immersed in the tub, a motor group sets into rotation the part carrying element. Opposite movements with respect to those described are used at the end of processing to bring the workpiece to an unloading station.
  • An aim of the present invention is to create a machine for drag-finishing of mechanical parts which enables bringing the parts being worked from a central position also into an offset position with respect to the centre of the working tub, though with a considerable constructional simplicity of the machine.
  • a further aim of the invention is that it enables the loading and unloading of the parts being worked simply and rapidly and that it can be automated for use in robotized areas.
  • a further aim of the invention is to enable automatic unloading of working media from the rotating tub.
  • the density of the media increases according to the rotation velocity of the media, internally of the rotating tub, so that a greater density thereof is obtained at a greater distance from the centre thereof.
  • the machine of the invention enables regulating the position of the shaft in order to carry out the most suitable working for each type of part.
  • the rotating part-carrying element exhibits a support shaft, the support shaft being connected to the motor group thereof by means of a connection enabling an inserting movement from below in an upwards direction.
  • This solution enables carrying out the parts loading and unloading simply and rapidly and also automatically, for example internally of a robotized area.
  • a brush is connectable to the support shaft which, during the rotation of the tub, can move along a first vertical axis and along a second horizontal axis so as to bring the brush to involve a whole volume of the tub.
  • a gutter is associated to the rotating tub, at a perimeter portion thereof, and the bottom of the rotating tub is provided with evacuating holes of the finishing media, the holes being openable by switches at the gutter so as to convey the finishing media thereto.
  • An advantage of this solution consists in enabling conveying the media to be evacuated towards a perforated gutter to which a container for collecting the finishing media can be associated.
  • Figure 1 illustrates the machine 10 provided with a frame 12 housing a tub 14 that can contain finishing media.
  • the tub 14 can be rotated by a motor 16 located below the tub 14.
  • a motor group 18 is also connected to the frame 12, which motor group 18 can rotate a rotary plate 22 provided with a shaft 21 connected to the motor group 18 by means of a connection 30, more fully described in the following.
  • the motor group and the rotary plate 22 can move along guides 27,28 along a vertical axis Y ( figure 4 ), for example by means of piston-cylinder group or other known technical means, in such a way as to bring the rotary plate 22, and the part 50 present thereon, from a raised position to a working position internally of the tank 14 containing the finishing media.
  • the motor group 18, and consequently also the rotary plate 22, can also move along a horizontal axis X ( figure 5 ) sliding over guides 24,26, visible in particular in figure 2 , for example by means of piston-cylinder group or other known technical means, in order to bring the rotary plate 22 internally of the rotating tub 14, but in an offset position to the centre of the rotating tub 14. Therefore, the machine 10 described is able to perform offset finishing operations i.e. a new type of finishing which bases its dynamics on the synergy of the rotating tub 14, containing the finishing media, and on the rotary plate 22 which, initially centred with respect the rotation axis of the rotating tub, can remain in an elevated position with respect to the rotating tub 14 so as to enable loading and unloading ( figure 3 ).
  • offset finishing operations i.e. a new type of finishing which bases its dynamics on the synergy of the rotating tub 14, containing the finishing media, and on the rotary plate 22 which, initially centred with respect the rotation axis of the rotating tub, can remain in an elevated position with respect to
  • the machine 10 comprises a movement group for a rotating part-carrying element 12, where the movement group comprises the motor group 18 to set in rotation the shaft 21 able to support the rotating part-carrying element 12, and comprises the guides 27,28 along the vertical axis Y, the guides 24,26 and along the horizontal axis X, and furthermore the corresponding movement means to carry the motor group and the part-carrying element along said guides.
  • the movement group can carry the part-carrying element 22, along the first vertical axis Y, internally to the finishing media in the rotating tub 14 and can successively move the rotating part-carrying element 22, along the second horizontal axis X, towards an offset position with respect to the centre of the rotating tub 14.
  • the movement of the part-carrying element 22 along the second horizontal axis X inside the finishing media can suitably regulated in order to reach eccentrical positions as desired with respect to the centre of the rotating tub 14 and can be performed with the part-carrying element 22 in rotation or not.
  • the rotary plate 22 in the rotating tub 14 descends along the vertical axis Y ( figure 4 ), while beginning to rotate, by centrifuging the media toward the perimeter, thus freeing up space to allow the plate 22 to descend.
  • the plate is translated towards the external edge of the rotating tub 14 along a horizontal axis X ( figure 5 ).
  • the tub 14 rotates clockwise, while the rotary plate 22 is located in an offset finishing position, close to the edge of the tub 14.
  • the rotary plate 22 rotates anti-clockwise, or in the opposite direction to the rotation of the tub 14.
  • the support shaft 21 of the rotary plate 22 can be applied by inserting a male coupling 32 connected to the support shaft 21 into a female coupling 30, by simple insertion from below in an upwards direction, as can be seen in figure 6 .
  • This arrangement enables having a rotating head of a simple type and not indexed, as it is thus possible to halt the head in an approximate position, for example with a simple microswitch.
  • the coupling comprises a first group of orientating pins 60 and the support shaft 21 includes a second group of orientating pins 62, where the blocking of the support shaft 21 inside the connection can occur when the first and the second group of orientating pins are in a predetermined orientation position e.g. arranged more or less at 180° to one another.
  • the robot tasked with inserting the shaft 21 in the connection simply has to centre the hole and push the shaft 21 upwards ( figure 8-9 ).
  • An economical machine is therefore realized, which carries out the offset finishing, while it is also possible, alternatively, to set up a robotized area 40, where a plurality of machines 10 is served by a robot 45 for loading and unloading parts ( figure 7 ), according to the natural development of workloads destined for the finishing department.
  • a robotized area 40 can easily be configured with a plurality of groups of the machine of the invention, up to five in number but even more, in relation to the model of the base unit, the type of robot and other factors.
  • the productivity of a like area can thus reach very high levels with very rapid loading and unloading of the technological tubs which in this case might be the same plates with the pre-assembled parts.
  • the rotary plate 22 can be assimilable to a frame element or workpiece carrier, such as to give many possibilities of positioning of the parts in function of the desired machining process.
  • the parts 50 can be placed in the upper position with respect to the rotary plate 22 ( figure 8 ), while in a second embodiment of the invention, the parts 50 may be placed in a lower position than the rotary plate 22 ( figure 9 ).
  • the parts 50 can be positioned externally with respect to the circumference of the rotating plate 12, for example, by portions 22' orientated at 90° relative to the plane in which the rotary plate 22 rotates, or the parts 50 can be positioned on portions 22' orientated at 45° relative to the plane in which the rotary plate rotates 22.
  • Figures 14-22 illustrate different configurations of a system for automatic emptying of the tub according to an aspect of the present invention.
  • a brush 110 with a plurality of bristles, for example metal, can be mounted.
  • the movement of the brush 110 is illustrated in figures 14-22 , i.e. it can be translated towards the external edge of the rotating tub 14 along the direction of the arrow F, i.e. so as to move from a central position ( figure 14 ) to a significantly offset position ( figure 22 ) internally of the tank 14, all in the context of the above-described movements, because the brush 110 is mounted on the same support shaft as the chuck element and can therefore be subject to the same movements that the support shaft makes.
  • rotating tub 14 can be provided, on a bottom thereof, with a plurality of holes, in turn provided with means for opening and closing thereof.
  • the rotating tub 14 is also associated, at a peripheral portion thereof, with a gutter 112, in turn exhibiting at least a hole 114.
  • the holes in the bottom of the rotating tub are represented in figures 14-22 by reference numeral 120 when they are fully closed, with reference numeral 120' when partially open and with reference numeral 120" when fully open.
  • the holes 120" completely or partially open 120' are in this configuration when they are positioned, during the rotation of the tank 14, above the gutter 114.
  • the holes 120,120', 120" can be opened by means of intervention of a respective switch 170.
  • Each switch 170 exhibits a substantially circular portion 155, able to cover the respective hole and an elongate portion 145.
  • the circular part of the switch 170 is also associated with a projecting portion 160 which houses a point of attachment for a spring 130 also fixed to a second point of attachment 135 on the bottom of the tub 14.
  • the elongate portion 145 is able to engage with a pawl 140 that can be brought, for example by pneumatic means, from a first lowered position to a second raised position that engages with the elongate portion 145 of the switch 170.
  • the switch 170 can then be rotated (in the direction of figures 23-25 ) around a fulcrum 150 from a first position in which the respective hole is closed to a second position in which the hole is open.
  • the spring 130 quickly returns the switch 170 into the closed position of the hole.
  • the described embodiment of the switches 170 is purely exemplary and not limiting; what is important is that the spring 130 is sufficiently powerful to enable the re-closing, by overcoming the forces of the granular media which attempts to escape, thus preventing the switch 170 from becoming stuck in the attempt thereof to close.
  • the switches 170 interfere with the pawl 140 enabling the opening of the holes enabling the granular media, gradually accumulated, to exit.
  • a motorized vibrator can be associated so as to shake the gutter 112 during unloading.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
EP14185788.8A 2013-10-01 2014-09-22 A machine for drag finishing of mechanical parts Active EP2857144B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001616A ITMI20131616A1 (it) 2013-10-01 2013-10-01 Macchina per la finitura a trascinamento di pezzi meccanici

Publications (2)

Publication Number Publication Date
EP2857144A1 EP2857144A1 (en) 2015-04-08
EP2857144B1 true EP2857144B1 (en) 2019-08-28

Family

ID=49683872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14185788.8A Active EP2857144B1 (en) 2013-10-01 2014-09-22 A machine for drag finishing of mechanical parts

Country Status (2)

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EP (1) EP2857144B1 (it)
IT (1) ITMI20131616A1 (it)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20161849A1 (it) 2016-03-21 2017-09-21 Paolo Redaelli Macchina per finitura a trascinamento di pezzi
JP6984592B2 (ja) 2016-03-28 2021-12-22 新東工業株式会社 振動バレル研磨方法及び振動バレル研磨システム
CN107855876B (zh) * 2017-11-28 2020-07-28 潘春亮 一种混凝土块均匀打磨装置
CN108214311B (zh) * 2017-12-29 2020-03-24 重庆巴豹商贸有限公司 一种工件加工用除尘装置
IT201900002159A1 (it) * 2019-02-14 2020-08-14 Paolo Redaelli Macchina per vibrofinitura e metodo per il suo impiego

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS541659Y2 (it) * 1973-07-16 1979-01-24
CH607757A5 (en) * 1976-04-20 1978-10-31 Ietatsu Ohno Vertical grinding machine
FR2511919B1 (fr) * 1981-08-27 1986-04-04 Parker Ste Continentale Machine de tribofinition a broches
JPS60143645U (ja) * 1984-02-29 1985-09-24 大栄歯科産業株式会社 被研摩物の保持具
DE19510900C2 (de) * 1995-03-24 1997-08-07 Wmf Wuerttemberg Metallwaren Verfahren und Vorrichtung zur Oberflächenbehandlung der Innenoberfläche eines Hohlkörpers
US6406356B1 (en) * 2001-03-12 2002-06-18 Frederick E. Brooks Wheel finishing apparatus and method
ITMI20110851A1 (it) * 2011-05-16 2012-11-17 Paolo Redaelli "macchina per finitura per trascinamento e metodo relativo"
DE202011108951U1 (de) * 2011-12-13 2012-12-14 Otec Präzisionsfinish GmbH Vorrichtung zur Oberflächenbearbeitung von Werkstücken

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
ITMI20131616A1 (it) 2015-04-02
EP2857144A1 (en) 2015-04-08

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