EP1621308A1 - Outil de finition - Google Patents

Outil de finition Download PDF

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Publication number
EP1621308A1
EP1621308A1 EP04425566A EP04425566A EP1621308A1 EP 1621308 A1 EP1621308 A1 EP 1621308A1 EP 04425566 A EP04425566 A EP 04425566A EP 04425566 A EP04425566 A EP 04425566A EP 1621308 A1 EP1621308 A1 EP 1621308A1
Authority
EP
European Patent Office
Prior art keywords
tool according
scraper element
tool
cylinder
piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04425566A
Other languages
German (de)
English (en)
Inventor
Pietro Vianello
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Garoll Srl
Original Assignee
Garoll Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Garoll Srl filed Critical Garoll Srl
Priority to EP04425566A priority Critical patent/EP1621308A1/fr
Publication of EP1621308A1 publication Critical patent/EP1621308A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/08—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads
    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/008—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding ceramics, pottery, table ware
    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain

Definitions

  • the present invention relates to a finishing tool for moulded pieces, in particular for removing joint burrs.
  • the tool proposed here is particularly suitable for use in the sector of producing ceramic products, for example sanitary items, such as toilets.
  • the finishing of a moulded piece in ceramic material can be carried out as soon as the piece is demoulded from the mould, before it is dried (piece still wet or "raw"), or after it has been dried (dry).
  • Making the finishing of a piece when dry does not pose any particular problems, and can be done in an automated way, for example by means of a robot with a suitable tool. However, when the piece is dry, the finishing does not allow the same level of precision as is possible with a raw piece, since the material has solidified.
  • a special robot must be used at the end of the drying line of the pieces. If the finishing is performed by the robot used to carry out the glazing phase of the dried pieces, said phase is slowed down considerably with a drop in productivity.
  • each handling suffered by a piece for being transferred from one station to another may be a source of errors during the positioning in relation to the robot that is programmed to interact with said piece.
  • the finishing of the raw piece is much more delicate and is currently still carried out by man.
  • the ceramic material when is just cast, is a tixotropic material, that is, if it suffers mechanical stress, it loses its consistency and becomes deformed.
  • it is necessary to gauge the pressure to be impressed by the finishing tool on the surface to be worked suitably, so as not to penetrate the material and cause irreparable damage to the piece.
  • the optimum working pressure of the tool varies according to the piece or part of the piece to be finished.
  • the robot is equipped with a traditional tool, such as a spatula or scraper, it runs the risk, for example, as a result of inaccuracies during the relative positioning between the tool and the piece to be finished, of applying excessive pressure on the tool, which would damage the piece, or insufficient pressure, which would not achieve the finishing in the required fashion, since the robot has to follow a fixed path and is bound by mechanical constraints.
  • a traditional tool such as a spatula or scraper
  • the problem at the origin of the present invention is to satisfy the above stated need to perform the finishing of the moulded pieces in an automated way and before the material is dry, thus resolving the above problems at the same time.
  • the idea of the solution at the origin of the present invention is to regulate the tension or flexibility of the part that comes into contact with the surface of the piece to be finished, and therefore its incisiveness on this surface at an equal distance from it, in order to compensate for any shifts in optimum pressure that said part should apply on the piece and the pressure actually applied.
  • figure 1 is an elevation view of the tool according to the invention.
  • figure 2 is a view of the tool from above;
  • figure 3 shows a partial axial section of the tool
  • figure 4 shows the tool in a configuration suitable for self-cleaning
  • figure 5 represents a detail of a scraper element of the tool in a twisted configuration to aid the lateral evacuation of the material removed;
  • figure 6 represents an example of a robot equipped with the tool according to the invention.
  • figure 7 represents a block diagram of an example of a control system of the finishing operation carried out using the tool of the invention.
  • the tool 10 is particularly suitable for being applied to a handling or manipulating device to accomplish the finishing in an automated manner, or without the intervention of an operator.
  • the tool proposed here is configured to be applied to the wrist 11 of a robot 12, as will be described in further detail later on.
  • the tool 10 also presents structural and functional characteristics, which make it particularly suitable for carrying out the finishing on ceramic products, for example sanitary items, as soon as they have been demoulded from the mould, before drying.
  • the tool 10 comprises at least one scraper element 13, which is suitable for sliding over a surface of the item to be finished. Said scraper element 13 extends between two opposite end portions 13'.
  • the scraper element preferably extends along a main X axis.
  • the scraper element 13 is in the shape of a strap or thin sheet, for example of metal.
  • the form of the scraper element is particularly suitable for removing the burr on ceramic material that is still raw. In fact, the scraper element comes into contact with the surface to be finished by means of a flat surface part, without penetrating the material, which is still soft.
  • both the thin thickness of the strap or reed and the wire structure give the scraper element a certain flexibility.
  • the end portions 13' of the scraper element 13 are fixed to relative support means 14, 15, which can be moved by actuator devices 16 in relation to each other in a controlled manner to allow the tension of the scraper element to be regulated.
  • This regulation of the tension or flexibility of the scraper element 13 is necessary so that this element applies the correct pressure on the surface to be finished, depending on the piece or part of the piece to be worked.
  • this element applies the correct pressure on the surface to be finished, depending on the piece or part of the piece to be worked.
  • calibrating the flexibility of the scraper element it is possible to compensate for any inaccuracies in positioning the scraping element in relation to the surface to be finished, inaccuracies that might result in the scraper element being too incisive and irreparably damaging the piece or not being incisive enough, for example not removing the joint burr.
  • This option to carry out adjustments is particularly important in the case of a tool handled by a manipulation device, for example a robot, and in the case of the finishing of a piece that is still raw and therefore susceptible to irreparable damage.
  • the support means 14, 15 of the end portions 13' of the scraper element 13 can preferably be moved along a direction that is parallel to the direction of the X axis of said part.
  • the actuator devices 16 of the tool comprise an actuator cylinder.
  • the support means 14, 15 are fixed to the body 16' and stem 17 of the piston of said cylinder, respectively.
  • said cylinder is an anti-rotation, pneumatic cylinder.
  • the movements of the cylinder piston, and therefore the regulation of the flexibility of the scraper element 13, are preferably controlled by a proportional valve (indicated schematically by block 26 in the diagram in figure 7).
  • the support means 14, 15 comprise, for example, a fixed flange 14 that is integral with the bottom of the body 16 of the pneumatic cylinder and a mobile flange 15 that is integral with the stem 17 of said cylinder.
  • devices 18 for regulating the angular position of strap 13 are associated to the support means 14, 15 of the end portions of said strap 13.
  • said devices 18 allow the angle of incidence of the strap to be regulated in relation to the surface of the piece to be finished.
  • said angle of incidence is nonetheless preferably negative.
  • the strap 13 forms an acute angle with the part to be finished, whilst it runs over the surface of the piece.
  • the devices 18 for regulating the angular position of the strap 13 can be adjusted independently of each other.
  • the end portions 13' of the strap 13 can be rotated differently from each other. This allows said end portions 13' to be rotated slightly in the opposite direction, for example, to give the strap 13 a slightly twisted course to aid the lateral evacuation of the material removed during the finishing operation (figure 5).
  • each end portion 13' of the scraper element 13 is integral with a small plate 19 sliding angularly on a relative support flange 14, 15.
  • a curved slot 20 is made in each small plate 19 to pass a screw 20' to fasten the small plate 19 to the flange.
  • a shaped locking pin 21, with a semi-cylindrical shape, for example, extends from each small plate 19, and a relative end portion 13' of the scraper element 13 is fixed to the pin, for example, by screwing.
  • each locking pin 21 is housed in a respective cavity that is provided in the relative support flange 14, 15.
  • the curved slot 20 allows each small plate 19 to be mounted in a required angular position.
  • the tool 10 is equipped with a plurality, for example, of three, scraper elements 13.
  • the support flanges 14, 15 of said parts present an axis of symmetry coinciding with the axis of the actuator cylinder 16.
  • the scraper elements 13 are fixed to the support flanges 14, 15 around the main axis of the cylinder.
  • the tool 10 comprises a portion 22 for coupling to a handling device that is programmed to make the tool follow a set path.
  • Said handling device is preferably a robot 12, for example an anthropomorpho robot.
  • the coupling part 22 also comprises a shaped plate 23 for resting the tool in a relative deposit.
  • the tool 10 is part of a system for automated realisation of the finishing operation, which also comprises transducer devices 24 suitable for recording a quantity correlated to the finishing operation, besides the tool itself, the handling device 12 onto which it is mounted and the control devices 26 of the actuator devices 16 of the support means of the scraper element.
  • This quantity can be used to set the correct value of flexibility that must be possessed by the scraper element.
  • the transducer devices 24 are connected in a closed ring to a control unit 25 that is planned to control the proportional valve 26.
  • the transducer devices advantageously comprise a pressure transducer 24, suitable for recording the pressure P applied by the scraper element on the surface of the piece to be finished. If the pressure recorded is greater than the optimum pressure, for example because of the tool being drawn too close to the piece to be finished, the control unit 25 will command the proportional valve 26 to make the piston return back into the cylinder 16 by a ⁇ x quantity to reduce the tension of the scraper element. This will translate into a ⁇ P decrease in the pressure exerted by the scraper element 13 on the surface.
  • the control unit will command the proportional valve to make the piston come out of the cylinder and increase the tension of the scraper element, thus making the scraper element more incisive in relation to the surface to be worked.
  • a feeler pin device for example, which is suitable for recording discontinuity on the surface to be finished can be used as transducer devices, or viewing devices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP04425566A 2004-07-27 2004-07-27 Outil de finition Withdrawn EP1621308A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04425566A EP1621308A1 (fr) 2004-07-27 2004-07-27 Outil de finition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425566A EP1621308A1 (fr) 2004-07-27 2004-07-27 Outil de finition

Publications (1)

Publication Number Publication Date
EP1621308A1 true EP1621308A1 (fr) 2006-02-01

Family

ID=34932667

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425566A Withdrawn EP1621308A1 (fr) 2004-07-27 2004-07-27 Outil de finition

Country Status (1)

Country Link
EP (1) EP1621308A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2929164A1 (fr) * 2008-03-31 2009-10-02 Snecma Sa Procede d'ebavurage d'une piece en matiere ceramique obtenue par injection d'une pate ceramique dans un moule
TWI755264B (zh) * 2021-01-27 2022-02-11 國立臺北科技大學 陶坏內孔口倒角器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB611856A (en) * 1946-05-10 1948-11-04 Sulzer Bros London Ltd Improvements in or relating to the manufacture of pottery and like articles
GB1002976A (en) * 1961-10-18 1965-09-02 Heinrich Seltmann Improvements in or relating to apparatus for edging ceramic objects
GB2163697A (en) * 1984-08-21 1986-03-05 Keramik Wtb Veb Apparatus and process for deburring unfired ceramic blanks

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB611856A (en) * 1946-05-10 1948-11-04 Sulzer Bros London Ltd Improvements in or relating to the manufacture of pottery and like articles
GB1002976A (en) * 1961-10-18 1965-09-02 Heinrich Seltmann Improvements in or relating to apparatus for edging ceramic objects
GB2163697A (en) * 1984-08-21 1986-03-05 Keramik Wtb Veb Apparatus and process for deburring unfired ceramic blanks

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2929164A1 (fr) * 2008-03-31 2009-10-02 Snecma Sa Procede d'ebavurage d'une piece en matiere ceramique obtenue par injection d'une pate ceramique dans un moule
TWI755264B (zh) * 2021-01-27 2022-02-11 國立臺北科技大學 陶坏內孔口倒角器

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