US20130309945A1 - Perfected Grinding Machine and Grinding Method - Google Patents

Perfected Grinding Machine and Grinding Method Download PDF

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Publication number
US20130309945A1
US20130309945A1 US13/994,611 US201113994611A US2013309945A1 US 20130309945 A1 US20130309945 A1 US 20130309945A1 US 201113994611 A US201113994611 A US 201113994611A US 2013309945 A1 US2013309945 A1 US 2013309945A1
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US
United States
Prior art keywords
grinding machine
piece
cylinder
lunettes
holder head
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.)
Abandoned
Application number
US13/994,611
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English (en)
Inventor
Giovanni Boselli
Marco Cozzi
Thomas Andersson
Matteo Zini
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.)
Tenova SpA
Original Assignee
Tenova SpA
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Filing date
Publication date
Application filed by Tenova SpA filed Critical Tenova SpA
Assigned to TENOVA S.P.A. reassignment TENOVA S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANDERSSON, THOMAS, ANZINI, MATTEO, BOSELLI, GIOVANNI, COZZI, MARCO
Publication of US20130309945A1 publication Critical patent/US20130309945A1/en
Abandoned legal-status Critical Current

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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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally
    • 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
    • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
    • B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
    • 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
    • B24B41/065—Steady rests
    • 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
    • B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces

Definitions

  • the present invention relates to a perfected grinding machine for operative cylinders and a method for the grinding of said cylinders.
  • operative cylinders refers, for example, to cylinders of rolling mills for the rolling of metals, those used in paper-mills, those used in oil-pressure applications, shafts of marine motors and in general all cylinders made of metallic and non-metallic materials which are of industrial interest.
  • the latter in fact, have dimensions varying from 40 mm to 2,300 mm in diameter, 1,000 mm to 12,000 mm in length and weights ranging from a few tens of daN up to 230-250 t.
  • the grinding machines which can be used for these cylinders therefore have specific characteristics and must not be confused with the smaller and traditional lathes or similar machines which, in this sense, are not capable of effecting these grinding processes.
  • Known grinding machines normally comprise a piece-holder head, generally fixed, whose function is to entrain the piece being processed in rotation and, in some applications, support it, and a movable tailstock center which can be moved axially with respect to the piece-holder head and whose function is to provide an axial reference with respect to the cylinder and, in some applications, also support it.
  • the grinding of a cylinder must always be preceded by a preliminary positioning phase of the latter on the machine, which is effected by inserting the cylinder to be ground between the piece-holder head and the tailstock center and subsequently supporting it between centers of the machine associated with the head and tailstock center; furthermore, if necessary, said support of the cylinder is tightened with contrast devices, also called lunettes, which, in some cases, can completely sustain the weight of the cylinder, thus eliminating the supporting function of the head and tailstock center.
  • contrast devices also called lunettes
  • the known art generally envisages that before loading the cylinder, the lunettes be positioned along the base of the machine in order to house the cylinder to be ground.
  • the lunettes can be various types of lunettes: those suitable for opposing the grinding forces in the case of cylinders supported on the tips, or suitable for supporting the weight of the cylinder in all other cases.
  • the tailstock center must be positioned, also in this case in relation to the dimensions of the cylinder. All of these activities and generally all activities aimed at adapting a grinding machine for housing a certain cylinder are defined as the set-up of the machine.
  • the correct positioning of the cylinder on the grinding machine therefore envisages that the tailstock center and lunettes or contrast devices be positioned in relation to the length of the cylinder at variable distances from the piece-holder head, which is fixed, by moving them in an axial direction either towards or away from the latter, depending on the length of the cylinder.
  • Both the tailstock center and the lunettes or contrast devices are usually moved and regulated in position individually, regardless of whether these set-up operations are manual or automatic.
  • the manual solution is economical, on the other, it requires time and accuracy on the part of the operator, whereas although the automatic solution guarantees operational velocity and precision, it requires a movement and control mechanism for the tailstock center and for each of the lunettes.
  • the general objective of the present invention is consequently to overcome these and other drawbacks of the known art.
  • a grinding machine for operative cylinders which comprises a piece-holder head and a tailstock center provided with centers for the movement and, in some cases, support of a cylinder being processed, wherein the machine comprises movement means associated with both the piece-holder head and the tailstock center and possibly lunettes for allowing them to move along a common movement direction.
  • both the piece-holder head and the tailstock center and possibly the lunettes are each associated with a single endless screw equipped with two portions having a discordant helicoidal threading, so that they can be moved simply, accurately and rapidly.
  • FIG. 1 illustrates a side view of a grinding machine according to the present invention
  • FIG. 2 illustrates a side view in perspective of parts of the machine of FIG. 1 ;
  • FIG. 3 illustrates a detail of the machine of the previous figures in a front view
  • FIG. 4 illustrates the detail of the previous figure in a side view.
  • this shows a grinding machine according to the present invention.
  • the grinding machine 10 comprises a base 11 on which a piece-holder head 13 and tailstock center 12 are translatingly assembled, which serve to move and possibly support a cylinder 14 which is positioned between them during the grinding operation.
  • the machine 10 represented is of the type in which the cylinder being processed is supported by two rotating centers 81 and 83 , positioned in the piece-holder head 13 and tailstock center 12 , whereas the lunettes 20 , 21 , 22 are positioned in contact with the cylinder and have the function of providing a contrast to the possible bending of the cylinder caused by the same processing.
  • the machine 10 can equivalently be of a different type, in which the lunettes, in addition to having the function described above, also have the function of supporting the whole weight of the cylinder being processed, whereas the piece-holder head and tailstock center only have the function of bringing it into rotation, to allow its grinding on the part of a grinding wheel or equivalent tool, or said lunettes can be completely absent, as in the case of grinding between the centers of squat cylinders, etc.
  • the piece-holder head 13 preferably comprises a single body which, in accordance with the disclosures of the present invention, is capable of translating on two linear guides 80 with which it is coupled by means of suitable sliding blocks.
  • the rotating center 81 which, in some cases, forms a support for the cylinder 14 , can be housed inside the body of the piece-holder head 13 .
  • a motor 71 can be possibly positioned in the rear part, with the relative transmission, for actuating the rotation of the cylinder 14 .
  • the tailstock center 12 also comprises a body which is capable of translating thanks to the presence of two linear guides 80 situated in the lower part of the structure with which it is coupled by means of suitable sliding blocks.
  • the movable center 83 which, in some cases, represents the second support for the cylinder, can be housed inside the body of the tailstock center 12 .
  • the tailstock center 12 can have a device in the lower part, which allows a preloading to be generated through a spring device: this preloading acts in an axial direction and guarantees the continuous contact between the cylinder 14 and two movable centers 81 and 83 .
  • the machine 10 can also comprise contrast or supporting lunettes 20 , 21 , 22 .
  • FIG. 1 can also run on the guides 80 and must be present at least in one unit 20 , but generally in at least three 20 , 21 and 22 and normally in an odd number. Only in particular cases, when the geometry of the cylinder requires this, is the use envisaged of lunettes in an even number, i.e. without the central lunette. Consequently, except for this particular case, the set of lunettes always comprises a central lunette 20 or, more generally, the central lunette 20 and two side lunettes 21 and 22 , or four side lunettes etc.
  • the machine 10 also comprises a grinding wheel which can be moved parallelly to the axis of the cylinder, not shown for the sake of concision, and in any case known in itself in this type of grinding machine.
  • the grinding machine 10 comprises movement means associated with both the piece-holder head, the tailstock center and also the lunettes or contrast devices, to allow them to move along a common movement direction.
  • the movement means comprise a endless screw 16 coupled with both the piece-holder head 13 , the tailstock center 12 , and lunettes 20 , 21 and 22 so that, when brought into rotation, the screw 16 actuates both the approach or withdrawal in the same direction along which the screw 16 extends.
  • the latter produced in a single piece, has two threaded portions 160 and 161 with which a corresponding sleeve of the piece-holder head 13 , tailstock center 12 and each of the lunettes 20 , 21 and 22 , is engaged, which will be described in further detail hereunder.
  • the movement means also comprise coupling/decoupling means of the piece-holder head 13 , tailstock center 12 and lunettes 20 , 21 and 22 , to the threaded sleeves engaged on the screw 16 .
  • This feature easily enables a large quantity of movement combinations of the units 12 , 13 , 20 , 21 and 22 , to be obtained, among which the symmetrical movement of the piece-holder head and tailstock center, particularly useful in the case of the grinding of “thin” or “Sendzimir” cylinders, which is described hereunder.
  • the head 13 and tailstock center 12 During the positioning of the head 13 and tailstock center 12 , these must be moved in the same direction but in opposite senses (to be moved towards the ends of the cylinder). In this way, by actuating the screw 16 , the piece-holder head 13 and tailstock center 12 can be moved towards the ends of the cylinder 14 to be coupled with it and support it.
  • the cylinder in spite of its dimensions, can be easily positioned as, once it has been arranged on the machine in the correct position, the head and tailstock center are moved until they are correctly positioned, resting at the ends of the cylinder to be processed.
  • This particular feature also significantly facilitates the projecting of mechanisms of a possible automatic loading system, as a correct coupling of the head 13 with the cylinder can also be obtained with a simple two-axis loading device (as the head can be moved).
  • Asymmetrical positioning of the piece-holder head and tailstock center symmetrical positioning of the lunettes: in this case, the lunettes are synchronously positioned, making both of the female screws of the latter integral with the screw. In this way, by actuating the screw, they will move for the same distance but in opposite senses. After positioning these two groups, their female screws are disengaged from the screw. At this point, the female screw of the piece-holder head and tailstock center are alternatingly made integral with the screw, moving first one group and then the other.
  • the selection mechanism of the parts to be moved envisages, for each of these, a sleeve 90 which comprises a cylindrical mantle and is engaged on the endless screw 16 by means of a threading inside the mantle itself.
  • Each sleeve 90 can also be connected to the unit to be moved by means of a suitable mechanism.
  • the blocking means of the unit to be moved can comprise electromagnets, mechanical coupling means such as fixing pegs, wedges, removable interference profiles or other similar items.
  • the coupling/decoupling means of the sleeve to the part to be positioned comprise two arms 91 , 92 pivoted to the structure of the part to be moved (piece-holder head, tailstock center and lunette) and each provided with an engagement end 93 , 94 with said sleeve 90 and an opposite free end 95 , 96 coupled with an actuator 97 .
  • the actuator 97 is preferably a linear actuator, for example a gas, pneumatic, hydraulic, electric actuator or similar: in the non-limited embodiment illustrated, it is a hydraulic actuator equipped with a cylinder and piston which protrudes variably from the cylinder.
  • the actuator 97 is coupled, preferably hinged, to the free ends 95 , 96 of the arms 91 , 92 ; each engagement end 93 , 94 of each arm 91 , 92 is equipped with a clamp with linings for coupling with the outer cylindrical surface of the sleeve 90 .
  • the two arms 91 , 92 have their fulcrum along their body in the points O′ and O′ 1 so as to oscillate, so that as the two free ends 95 , 96 approach, the opposite ends 93 , 94 move away and vice versa.
  • the machine 10 preferably comprises a single screw 16 and both the head 13 and the tailstock center 12 and lunettes 20 , 21 , 22 are equipped with these coupling/decoupling means, each having a specific corresponding sleeve.
  • both the lunette and the head and tailstock center can be activated contemporaneously or separately with a single command, obtaining an extremely high versatility of the machine.
  • the movement means for the head 13 and for the tailstock center 12 and/or for the lunettes can be produced differently, for example by means of a transmission belt coupled with trolleys, so as to enable the movement of the head 13 and tailstock center 12 and/or lunettes, as envisaged above.
  • the movement means can equivalently comprise two separate screws and two motors, even if, in this case, the cost of the machine is higher.
  • a grinding machine 10 as described above can also advantageously be useful for implementing a new positioning method of an operative cylinder.
  • the fact that the piece-holder head is fixed implies a positioning of the cylinder on the machine, which is effected considering the piece-holder head itself as reference, with respect to which all the relevant sizes are measured and the positioning of the cylinder is effected, with negative consequences for both the set-up time of the machine and also for the loading means which must be used in combination with the latter.
  • Another drawback linked with the known art relates to the fact that, during the loading, the cylinder must be moved in three directions and in particular, among these, also along the longitudinal axis, so as to be correctly positioned on the grinding machine; these regulation movements require the use of a loading device.
  • this device In manual plants, this device is typically a gantry crane or a jib crane and the precision with which the cylinder must be moved and positioned requires long positioning times, skilled operators and the risk that, with an erroneous manoeuvre, the cylinder, or machine, or both, can be damaged.
  • the movement of the cylinders is effected with 3-axis loading systems which if, on the one hand, they reduce the maneuvering times and increase the safety of the same, on the other, they require machines which move the load along 3 axes and are consequently, by nature, complex, costly and require maintenance.
  • the positioning of the lunettes and tailstock center is also quite lengthy with the traditional technology, in the sense that they must be moved along the cylinder to be correctly positioned; as far as the lunettes are concerned, for example in the case of the grinding of so-called “thin” or “Sendzimir” cylinders, one is generally positioned in correspondence with center-line of the cylinder and the others at its sides, but care being taken to measure the distances from the side of the cylinder associated with the piece-holder head. Also in this case, if, on the one hand, the manual solution is economical, on the other, it requires time and accuracy on the part of the operator, whereas although the automatic solution guarantees operational velocity and precision, it requires a movement and control mechanism for the tailstock center and for each of the lunettes.
  • a positioning method can be easily effected, which should also be considered an object of the present invention, which always comprises the following steps:
  • a complete version of the positioning method also envisages the following steps:
  • A1 preparing a rolling cylinder to be ground
  • the reference point mentioned in step A above can possibly coincide with the positioning of the transversal, longitudinal center-line plane of the cylinder in correspondence with a fixed lunette with respect to the frame of the machine and/or with respect to the side lunettes.
  • this is preferably fixed onto the machine and coincides with a lunette or contrast device, in particular with the central lunette; this lunette can obviously be removed to allow the grinding of cylinders having a particular form and geometry.
  • Both the piece-holder head and tailstock center can preferably be moved so as to be always equidistant from the reference point: their movement, in other words, is of the same entity and is always effected in the same direction but in opposite senses.
  • side lunettes i.e. those situated at the sides of the central lunette which coincides with the reference point, these can be advantageously moved to the same degree and in the same direction, but in opposite senses. There can be one or more of these side lunettes but always in the same quantity on both sides with respect to the central lunette.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
US13/994,611 2010-12-22 2011-12-13 Perfected Grinding Machine and Grinding Method Abandoned US20130309945A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI2010A002349A IT1403603B1 (it) 2010-12-22 2010-12-22 Macchina rettificatrice perfezionata e metodo di rettifica
ITMI2010A002349 2010-12-22
PCT/EP2011/006373 WO2012084159A1 (fr) 2010-12-22 2011-12-13 Rectifieuse améliorée et procédé de meulage

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US20130309945A1 true US20130309945A1 (en) 2013-11-21

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US13/994,611 Abandoned US20130309945A1 (en) 2010-12-22 2011-12-13 Perfected Grinding Machine and Grinding Method

Country Status (9)

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US (1) US20130309945A1 (fr)
EP (1) EP2655011B1 (fr)
JP (1) JP2014501180A (fr)
KR (1) KR20140045306A (fr)
CN (1) CN103354773A (fr)
CA (1) CA2821810A1 (fr)
IT (1) IT1403603B1 (fr)
RU (1) RU2013128362A (fr)
WO (1) WO2012084159A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108311965A (zh) * 2018-02-11 2018-07-24 诸暨市基麦罗进出口有限公司 一种铜铝复合管材新工艺设备
CN110014334A (zh) * 2019-05-24 2019-07-16 牟春凤 滚子连续磨削装置
CN117900997A (zh) * 2024-03-15 2024-04-19 山东硅瓷新材料有限公司 一种碳化硅制品磨削夹持工装

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108356618A (zh) * 2018-03-29 2018-08-03 浙江中硅新材料有限公司 一种高强度陶瓷辊用磨修设备
CN112497009A (zh) * 2020-11-30 2021-03-16 青岛凯诚绿色建筑有限公司 建筑工地用无缝钢管智能除锈养护设备

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US5520570A (en) * 1993-07-30 1996-05-28 Litton Industrial Automation Systems Inc. Workpiece radial locator device and method
US6149503A (en) * 1995-06-23 2000-11-21 Unova Uk Limited Method and apparatus for supporting a crankshaft in a grinding machine for grinding the crankpins of the crankshaft
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US20030213335A1 (en) * 2002-03-02 2003-11-20 Heimann Dipl.-Ing. Alfred Device for the rotary slaving of a crankshaft
US20080139092A1 (en) * 2006-12-08 2008-06-12 Lessway Richard J Steady rest for rotating shaft
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US20120164926A1 (en) * 2009-06-08 2012-06-28 Georg Himmelsbach Grinding-supporting device
US20120238187A1 (en) * 2009-11-03 2012-09-20 Georg Himmelsbach Method for grinding the main and rod bearing of a crankshaft by external cylindrical grinding and grinding machine for carrying out the method

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Publication number Priority date Publication date Assignee Title
US2185560A (en) * 1938-11-02 1940-01-02 Norton Co Indexing attachment for grinding machines
US2809472A (en) * 1955-11-25 1957-10-15 Landis Tool Co Interlocking work drive and clamping mechanism
US5520570A (en) * 1993-07-30 1996-05-28 Litton Industrial Automation Systems Inc. Workpiece radial locator device and method
US6149503A (en) * 1995-06-23 2000-11-21 Unova Uk Limited Method and apparatus for supporting a crankshaft in a grinding machine for grinding the crankpins of the crankshaft
US6450865B2 (en) * 1998-09-02 2002-09-17 Xerox Corporation Non-contact support for cylindrical machining
US20030213335A1 (en) * 2002-03-02 2003-11-20 Heimann Dipl.-Ing. Alfred Device for the rotary slaving of a crankshaft
US20080139092A1 (en) * 2006-12-08 2008-06-12 Lessway Richard J Steady rest for rotating shaft
US20110034114A1 (en) * 2007-04-24 2011-02-10 Christian Egger Vibration-Free Machining of Pilgrim Mandrels
US20120164926A1 (en) * 2009-06-08 2012-06-28 Georg Himmelsbach Grinding-supporting device
US20120238187A1 (en) * 2009-11-03 2012-09-20 Georg Himmelsbach Method for grinding the main and rod bearing of a crankshaft by external cylindrical grinding and grinding machine for carrying out the method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108311965A (zh) * 2018-02-11 2018-07-24 诸暨市基麦罗进出口有限公司 一种铜铝复合管材新工艺设备
CN110014334A (zh) * 2019-05-24 2019-07-16 牟春凤 滚子连续磨削装置
CN117900997A (zh) * 2024-03-15 2024-04-19 山东硅瓷新材料有限公司 一种碳化硅制品磨削夹持工装

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Publication number Publication date
EP2655011A1 (fr) 2013-10-30
RU2013128362A (ru) 2015-01-27
WO2012084159A1 (fr) 2012-06-28
ITMI20102349A1 (it) 2012-06-23
CN103354773A (zh) 2013-10-16
JP2014501180A (ja) 2014-01-20
EP2655011B1 (fr) 2014-07-30
CA2821810A1 (fr) 2012-06-28
IT1403603B1 (it) 2013-10-31
KR20140045306A (ko) 2014-04-16

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