US20140011431A1 - Method for the Positioning of Operative Cylinders on a Grinding Machine and Grinding Machine Which Implements This Method - Google Patents

Method for the Positioning of Operative Cylinders on a Grinding Machine and Grinding Machine Which Implements This Method Download PDF

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Publication number
US20140011431A1
US20140011431A1 US13/994,664 US201113994664A US2014011431A1 US 20140011431 A1 US20140011431 A1 US 20140011431A1 US 201113994664 A US201113994664 A US 201113994664A US 2014011431 A1 US2014011431 A1 US 2014011431A1
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United States
Prior art keywords
piece
cylinder
holder head
tailstock center
grinding machine
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Abandoned
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US13/994,664
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English (en)
Inventor
Claudio Trevisan
Erasmo Trenti
Thomas Andersson
Matteo Anzini
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Tenova SpA
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Tenova SpA
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Assigned to TENOVA S.P.A. reassignment TENOVA S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANDERSSON, THOMAS, ANZINI, MATTEO, TRENTI, ERASMO, TREVISAN, CLAUDIO
Publication of US20140011431A1 publication Critical patent/US20140011431A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a method for the positioning of operative cylinders on a grinding machine and a grinding machine which implements this method; it should be pointed out that the definition “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 2300 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.
  • 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 a piece-holder head and a tailstock center and subsequently supporting it between centers of the machine and, if necessary, tightening it with one or more lunettes or contrast devices, or resting the cylinder itself directly on a pair of supporting lunettes; either of the two solutions is selected in relation to the type of cylinder to be ground and the processing to be effected.
  • the known art envisages that the cylinder to be ground is first loaded onto the grinding machine with a loading device (such as, for example, a gantry crane, a jib crane or an automatic loading device), it is then moved until one of its ends is supported by the center of the piece-holder head, the tailstock center is then moved until the contact with this supports the opposite end of the cylinder, and finally the lunettes or contrast devices are moved along the cylinder, so as to position them correctly with respect to the part of the cylinder to be ground.
  • a loading device such as, for example, a gantry crane, a jib crane or an automatic loading device
  • the lunettes or contrast devices are normally produced as supports suitable for opposing the thrusts that the grinding wheel exerts on the piece being processed; they are normally positioned at regular distances along the cylinder, in order to uniformly oppose the forces during the grinding process.
  • set-up can be manual or automatic.
  • set-up time is extremely important as a series of various operations are required, which must be accurately effected in order to verify their correctness.
  • a reduction in the set-up times jeopardizes the simplicity and reliability of the machine, as both the lunettes and the tailstock center must be equipped with suitable movement devices and relative control systems.
  • Another drawback linked to 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, in order to be correctly positioned on the grinding machine; these regulation movements require the use of a loading device.
  • 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 maneuver, the cylinder, or machine, or both, can be damaged.
  • the movement of the cylinders is effected with 3 -axis loading systems and 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, care being taken to measure the distances from the side of the cylinder associated with the piece-holder head.
  • 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 positioning method has been conceived for these cylinders which envisages at least the following steps:
  • the movement of the piece-holder head and tailstock center is preferably of the same entity, in the same direction and opposite senses.
  • the reference system is identified specifically by the transversal, longitudinal center-line plane of the cylinder, and not already by one of its ends, as in the known art.
  • the piece-holder head and tailstock center are integral in their translation movement with respect to the frame of the machine, for example by coupling them both with the same screw, so that a rotation of the latter causes the same movement of both, in the same direction but in opposite senses.
  • the central reference system coinciding with the longitudinal center-line plane of the cylinder, offers other advantages: if, for example, an odd number of lunettes (one, three, etc.) is used, it is not necessary to reposition the lunette or central contrast device each time, which is preferably fixed on the machine in the position in which the center-line of the cylinder is assembled.
  • the positioning of the side lunettes is simplified as the distances can be measured by the central reference system, i.e. the center-line of the cylinder simplifying the movement and avoiding possible errors.
  • FIG. 1 illustrates a machine according to the present invention
  • FIG. 2 illustrates a detail of the machine of FIG. 1 ;
  • FIGS. 3 and 4 illustrate details of the machine of FIG. 1 .
  • A positioning the transversal, longitudinal center-line plane of the cylinder in correspondence with a reference point situated between a movable piece-holder head and tailstock center of said machine;
  • A1 preparing a rolling cylinder to be ground
  • step A above can possibly coincide with the positioning of the transversal, longitudinal center-line plane of said cylinder in correspondence with a fixed lunette with respect to the frame of the machine and/or with respect to the side lunettes.
  • step A the reference point, this is preferably fixed onto the machine and coincides with a lunette or contrast device, in particular with the central lunette, as will appear more evident below, in the description of the machine.
  • 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.
  • FIGS. 1 and 2 As far as the machine is concerned, reference should be made to FIGS. 1 and 2 .
  • the grinding machine 10 comprises a base 11 on which a piece-holder head 13 and tailstock center 12 are movably assembled, which serve to move and possibly support a cylinder 14 which is positioned between them during the grinding operation.
  • the machine 10 is of the type in which the processing cylinder is supported by two rotating centers 81 and 83 positioned in the piece-holder head 13 and tailstock center 12 .
  • 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 due to 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.
  • the piece-holder head 13 comprises a single body which is capable of translating thanks to the presence, in the lower part, of two linear guides 80 with which it is coupled by means of suitable sliding blocks.
  • the rotating center 81 can be housed inside the body of the piece-holder head 13 , which, in some applications, forms a rest for the cylinder.
  • a motor 71 can be positioned, with the relative transmission, for rotating the cylinder.
  • 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 can be housed inside the tailstock center 12 , which, in some applications, forms a second rest for the cylinder.
  • the tailstock center 12 can house a device in its lower part, which generates a preloading through a spring device.
  • This preloading acts in an axial direction and guarantees the continuous contact between the cylinder and two movable centers 81 and 83 and, at the same time, the desired axial preloading, if this is required by the processing, as is the case, for example, in the grinding of so-called “thin” cylinders.
  • the machine 10 also comprises a grinding wheel which can be moved parallel to the axis of the cylinder, not shown for the sake of conciseness, and in any case known in itself in this type of grinding machine.
  • Both the piece-holder head 13 and tailstock center 12 can be moved linearly along the base 11 so that they can move towards or away from each other, to house cylinders having different lengths.
  • the piece-holder head 13 and tailstock center 12 are coupled to movement means which allow their linear approach or withdrawal movement to the same extent, in the same direction and in opposite senses.
  • the movement means of this example comprise a worm screw 16 engaged with both the piece-holder head 13 and tailstock center 12 , 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; these movement means are illustrated in more detail in FIG. 2 .
  • the screw 16 produced in a single piece, has two threaded parts 160 and 161 with which a corresponding female screw of the piece-holder head 13 and tailstock center 12 is engaged.
  • the two threaded parts 160 , 161 of the screw 16 have contrasting helicoidal threadings, for example an anticlockwise threading and a clockwise threading, preferably having the same pitch.
  • the screw 16 is actuated in rotation by a motor 17 , for example an electric brushless motor or the like.
  • this solution also effects a kind of self-centering of the cylinder between the head 13 and tailstock center 12 , if in fact the cylinder were not correctly positioned along its axial direction, as both the head 13 and tailstock center 12 move with respect to a common central reference to the same degree, in the same direction and in opposite senses, their approach movement would allow a centering of the cylinder.
  • the machine 10 also comprises contrast or supporting lunettes 20 , 21 , 22 .
  • 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 cylinder is assembled with its transversal, longitudinal center-line plane (which, as in the case of so-called “thin” or Sendzimir cylinders, often coincides with the symmetry plane passing through the center of gravity and perpendicular to the generatrices of the cylinder) in a position corresponding to the central lunette 20 .
  • the latter at least in the case mentioned above, is consequently generally fixed in position with respect to the machine 10 or at its base destined for resting on the ground, and does not have to be moved when cylinders having different lengths are being processed, as, in any case, the longitudinal center-line point of the cylinder is always assembled in correspondence with said central lunette 20 .
  • central lunette 20 it is also possible to mechanically fix the central lunette 20 to the machine 10 , for example by means of screws or bolts, or make it integral with at least part of the base 12 , so that it represents a central and privileged reference point for the measurement and calculation of other dimensions.
  • a variant envisages controlling the position of both the lunettes 20 , 21 , 22 and the piece-holder head 13 and tailstock center 12 by means of a single screw command and a series of threaded sleeves 90 (one for each device to be moved) shown in FIGS. 3 and 4 enclosed.
  • Each sleeve 90 comprises a cylindrical mantle and is engaged with the worm screw 16 by means of a threading inside the same mantle.
  • 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 1 and O 1 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.
  • each female screw and the part to be moved associated with it is obtained by means of a system which operates in the following way: if a certain part is to be moved, for example the tailstock center, said blocking system constrains the threaded sleeve 90 (or female screw) to the body of the tailstock center itself and, at the same time, prevents its rotation, so that, once actuated, the screw rotates and the female screw, constrained to the tailstock center, cannot rotate integrally with the screw and consequently causes the tailstock center to translate.
  • the piece-holder head is to be moved and the tailstock center kept immobile, it is sufficient to disengage the specific sleeve from the body of the tailstock center and contemporaneously constrain that of the piece-holder head; in this way, once the screw begins to rotate (in this case to move the piece-holder head) the sleeve of the tailstock center will rotate integrally with itself, maintaining the sleeve itself in the same axial position and consequently not causing any movement of the tailstock center.
  • either the lunettes or the head or the tailstock center can be simply and rapidly activated contemporaneously or separately, to allow the cylinder to be suitably positioned and supported.
  • 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 movement means for the head 13 and for the tailstock center 12 and/or for the side lunettes 21 and 22 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.
  • the center-line of the whole machine 10 can also advantageously coincide with the central lunette 20 , making the positioning of the cylinder even more simple and intuitive.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Paper (AREA)
  • Machine Tool Units (AREA)
US13/994,664 2010-12-22 2011-12-07 Method for the Positioning of Operative Cylinders on a Grinding Machine and Grinding Machine Which Implements This Method Abandoned US20140011431A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI2010A002348A IT1403602B1 (it) 2010-12-22 2010-12-22 Metodo per il posizionamento di cilindri operativi su di una macchina rettificatrice e macchina rettificatrice che attua tale metodo
ITMI2010A002348 2010-12-22
PCT/EP2011/006359 WO2012084155A1 (en) 2010-12-22 2011-12-07 Method for the positioning of operative cylinders on a grinding machine and grinding machine which implements this method

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US20140011431A1 true US20140011431A1 (en) 2014-01-09

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US13/994,664 Abandoned US20140011431A1 (en) 2010-12-22 2011-12-07 Method for the Positioning of Operative Cylinders on a Grinding Machine and Grinding Machine Which Implements This Method

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US (1) US20140011431A1 (enrdf_load_stackoverflow)
EP (1) EP2655010B1 (enrdf_load_stackoverflow)
JP (1) JP5886871B2 (enrdf_load_stackoverflow)
KR (1) KR20130130778A (enrdf_load_stackoverflow)
CN (1) CN103354774A (enrdf_load_stackoverflow)
CA (1) CA2821808A1 (enrdf_load_stackoverflow)
IT (1) IT1403602B1 (enrdf_load_stackoverflow)
RU (1) RU2580966C2 (enrdf_load_stackoverflow)
UA (1) UA110808C2 (enrdf_load_stackoverflow)
WO (1) WO2012084155A1 (enrdf_load_stackoverflow)

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RU2606689C2 (ru) * 2015-06-10 2017-01-10 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский политехнический университет " Способ токарной и/или фрезерной обработки роторов турбин и крупногабаритных валов
JP2018202495A (ja) * 2017-05-30 2018-12-27 牧野フライス精機株式会社 ワーク支持装置
RU182069U1 (ru) * 2017-11-27 2018-08-02 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный технический университет" Приспособление для шлифования цилиндрических деталей
CN111906669B (zh) * 2020-08-17 2021-06-22 郑州工业应用技术学院 一种机械加工用产品表面清理设备及其使用方法
CN114619347A (zh) * 2022-05-16 2022-06-14 孔智科技（徐州）有限公司 一种通讯设备加工用外壳表面打磨装置

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US4221080A (en) * 1977-11-22 1980-09-09 Constructions De Clichy Work-tables of grinding machines
US4407095A (en) * 1981-04-14 1983-10-04 Tolstopyatov Konstantin S Device for abrasive cleaning of blanks shaped as bodies of revolution
US5014580A (en) * 1989-08-10 1991-05-14 Sierra Machinery, Inc. Centering stand for cylinder holder
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US6349929B1 (en) * 1999-09-09 2002-02-26 Ray R. S. Speltz Workholder apparatus
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US20110300777A1 (en) * 2010-06-04 2011-12-08 Jtekt Corporation Grinding method of multifunction grinding machine

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EP2655010B1 (en) 2015-04-15
UA110808C2 (uk) 2016-02-25
WO2012084155A8 (en) 2013-06-20
IT1403602B1 (it) 2013-10-31
WO2012084155A1 (en) 2012-06-28
ITMI20102348A1 (it) 2012-06-23
RU2580966C2 (ru) 2016-04-10
KR20130130778A (ko) 2013-12-02
EP2655010A1 (en) 2013-10-30
RU2013127594A (ru) 2015-01-27
CN103354774A (zh) 2013-10-16
JP5886871B2 (ja) 2016-03-16
JP2014504216A (ja) 2014-02-20
CA2821808A1 (en) 2012-06-28

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