JP2014504216A - Method for positioning a working cylinder in a grinding machine and grinding machine implementing the method - Google Patents

Abstract

The present invention relates to a method for positioning an operating cylinder on a grinding machine (10) such as a rolling mill or a paper mill, wherein A—the lateral and longitudinal center line surfaces of the cylinder are arranged on the grinding machine (10). Positioning to correspond to a reference point disposed between the movable piece holder head (13) and the movable tailstock center (12); and B-piece holder head (13) and tailstock center ( 12) moving until repetitive coupling occurs in the direction of the cylinder. A further object of the invention relates to a machine for carrying out the method.
[Selection] Figure 1

Description

  The present invention relates to a method for placing an operating cylinder in a grinding machine and to a grinding machine implementing the method. The term “operating cylinder” refers to, for example, rolling mill cylinders for metal rolling, cylinders used in paper mills, cylinders used in hydraulic machines, shafts of marine motors, and generally industrial metals. And all cylinders made of non-metallic materials.

  Grinding of the cylinders mentioned above, in particular rolling mills or paper mills, first has various drawbacks related to the height and weight of the cylinder, which is often quite large.

  In fact, these cylinders range in diameter from 40 mm to 2,300 mm, from 1000 mm to 12,000 mm in length and from several tens of daN to 230-250 tons.

  For the functions required of these cylinders, it is necessary to process the cylinders with precision and accuracy of a few thousandths of a millimeter.

  Therefore, the grinding machines that can be used for these cylinders have specific characteristics and should not be confused with small and traditional lathes or similar machines, in this sense, lathes etc. perform the grinding process Can not do it.

  Before grinding the cylinder, it is necessary to go through a pre-positioning stage of the cylinder on the grinding machine, which inserts the cylinder to be ground between the piece holder head and the tailstock center, and then the head And by supporting the cylinder between the center of the grinding machine associated with the tailstock center. In addition, if necessary, the cylinders are supported by tightening with a fixing device (contrast devices), also called Lunet, which in some cases provides full support for the weight of the cylinders and the head and tailstock center. Support function can be eliminated. Either strategy is selected depending on the type of cylinder to be ground and the processing to be performed.

  For example, for the processing of so-called “thin” cylinders, ie cylinders with a particularly small diameter / length ratio (typically examples are “Sendzimir” rolling mills, more generally “cluster” rolling mill cylinders). In the known technique, the cylinder is first mounted on the grinding machine using a mounting device (e.g., a gantry crane, jib crane or automatic mounting device), and then one of the ends is supported by the center of the piece holder head, The tailstock is then moved until it supports the opposite ends of the cylinder, and finally the lunat or fixing device is moved along the cylinder so that it is correctly positioned relative to the part of the cylinder to be ground.

  Lunet or fixing devices are usually manufactured as a suitable support to counter the thrust exerted on the part being machined by the grinding wheel and are usually placed at regular intervals along the cylinder to reduce the grinding resistance during the grinding process. Compete evenly.

  Since the piece holder head is fixed, all important distances are measured from the piece holder head, so that the tailstock and the lunat or fixing device are arranged in relation to this reference and the length of the cylinder. In response, the tailstock and lunat are moved axially toward or away from the reference.

  The execution of such work is typically defined in terms of settings and can be manual or automatic. In the manual case, the set period is very important because it requires a series of operations that need to be performed accurately to verify correctness. In the automatic case, both the Lunet and the tailstock need to be equipped with suitable moving devices and associated control devices, which can reduce the set-up time and reduce the simplicity and reliability of the machine.

  Another drawback associated with the known technology is that the cylinder must be moved in three directions, especially along the longitudinal axis, during mounting in order to be correctly positioned on the grinding machine, and this adjustment movement requires the use of a mounting device. Is necessary. In manual plants, this mounting device is typically a gantry crane or jib crane, and requires precision to move and position the cylinder, so it requires long positioning time, skilled workers, and wrong Operation involves the risk of damaging the cylinder and / or grinding machine. In an automatic plant, cylinder movement is performed by a three-axis mounting system, which on the one hand reduces working time and increases work safety, but on the other hand requires a machine to move the load along the three axes. Therefore, it is inevitably complicated and expensive, and requires maintenance. The positioning of the Lunet and tailstock center takes a considerable amount of time in the traditional technology in the sense that they need to be moved correctly along the cylinder and integrated into the piece holder head Note that it is necessary to measure the distance from the side of the cylinder. In this case, while manual solutions are economical on the one hand, workers need time and accuracy on the other hand, whereas automatic solutions guarantee work speed and accuracy, but mind. Requires movement and control mechanisms for the pedestal center and each lunet

  In the case of manual grinding machines, this problem is exacerbated by the fact that it is often necessary to grind cylinders with different lengths continuously, and that the set-up operation has to be carried out for each process. become.

  Specifically, it is necessary to measure the distance from the piece holder / head (acting as a reference) each time, and therefore all the lunats need to be moved along the cylinder, so each time only at the tailstock center There is also a need to move Lunet.

  Thus, the general purpose of the present invention is to overcome this and other shortcomings of known techniques.

  This object is achieved by a grinding method and a grinding machine having the features specified in the appended independent claims to be considered as an integral part of the present description.

At least the following steps:
Positioning the center line surface of the cylinder in the horizontal and longitudinal directions corresponding to a reference point arranged between the movable piece holder / head of the grinding machine and the tailstock;
A positioning method for the cylinder has been devised which includes the step of moving both the piece holder head and the tailstock to engage the cylinder.

  The movement of the piece holder head and tailstock is preferably in the same direction but in the reverse direction by the same amount.

  In this manner, the reference system is identified by the lateral and longitudinal centerlines of the cylinder, rather than one of the cylinder ends as in the known art.

  For this purpose, the piece holder head and tailstock are moved together in parallel with the frame of the grinding machine, for example by joining with the same screw, and when the screw is rotated, the piece holder head and tailstock Produces the same movement in the same direction but in reverse.

  The advantage obtained by this is clear. First, there is no need to move the cylinder axially in order to place the cylinder on the piece holder / head on the grinding machine, so a simpler and less expensive motion axis, whether manual or automatic, is mounted on two axes A device can be used.

  Furthermore, the central reference system coincides with the longitudinal centerline plane of the cylinder and provides other advantages. For example, when using an odd number of lunets (one, three, etc.), it is not necessary to reposition the lunet or central fixing device each time, and the lunet is preferably fixed to the grinding machine at a position in the central line where the cylinder is assembled. .

  Even if the number of renets is an even number (two, four, etc.), a similar advantage is obtained because the renets need to be positioned symmetrically with respect to the center line of the cylinder.

  This advantage in terms of reducing the set time is obvious in each process, and is even more remarkable when it is necessary to continuously process cylinders having different lengths with the same grinding machine. In the latter case, the known technique requires the central renette to be repositioned each time, while in the present invention, the central lunat always remains in the same position.

  An additional advantage is obtained by using a reference system located at the center line of the cylinder. Experience has shown that if the cylinder dimensions that need to be machined continuously on the same grinding machine vary in the range of about 0.5 meters, it is not actually necessary to move the lunat.

  If the variation in the longitudinal dimension of the cylinder is within the above range, all renets (both the central lannet, if included, and both lannets) can be held in the same position, so the set time Significantly reduced.

  Furthermore, since the distance is measured by the central reference system, the positioning of the lateral renets is simplified. That is, the movement is simplified by the center line of the cylinder, and errors can be avoided.

  The structural and functional features of the present invention and its advantages over known techniques will become apparent upon reading the following description, with reference to the accompanying drawings, which illustrate possible practical embodiments of the present invention. .

1 shows a grinding machine according to the invention. 2 shows details of the grinding machine of FIG. 2 shows details of the grinding machine of FIG. 2 shows details of the grinding machine of FIG.

First, the positioning method which is the object of the present invention always has the following steps:
Positioning the lateral / longitudinal centerline plane of the A-cylinder corresponding to a reference point located between the movable piece holder / head and tailstock of the grinding machine;
Connecting both the B-piece holder head and tailstock to the cylinder and moving to support the cylinder.

The complete version of the positioning method consists of the following steps:
A1: preparing a rolling cylinder for grinding;
A: positioning the lateral / longitudinal centerline surface of the cylinder in correspondence with a reference point arranged between the movable piece holder / head of the grinding machine and the movable tailstock center;
B: connecting both the piece holder head and the tailstock center with the cylinder and moving the cylinder until the cylinder is supported;
C: positioning at least two lateral renets, ie cylinder fixing devices, at the same distance from the central fixing lumnet;
including.

  The reference point described in step A above may coincide with the positioning of the centerline plane of the cylinder in the lateral and longitudinal directions, corresponding to the renette fixed to the frame and / or the lateral renette of the grinding machine. is there.

  Obviously, various modifications can be made to the method described above, all of which are the subject of the present invention, in which some of the steps of the method can be performed in reverse (eg, steps B and steps). C can be interchanged), or other steps can be added in connection with the secondary adjustment of the grinding machine, or depending on the specific form and geometry of the cylinder, the central lunat may not be used.

  Referring to step A, the reference point is fixed on the grinding machine and preferably coincides with the renette or fixing device, in particular the central renette, and clearly this cylinder has a specific shape and geometric shape by removing it. Can be ground.

  Both the piece holder head and tailstock center are preferably movable so as to be always equidistant from the reference point. In other words, the movement is the same amount and always takes place in the same direction but in reverse.

  Also, with respect to the side renets, i.e. the lumnets located on either side of the central lunat coincident with the reference point, they can advantageously be moved in the same direction but in the same amount in the reverse direction. There can be one or more side renets, but there must be the same number on either side of the central lunat.

  In this way, the reference point for the entire positioning stage is no longer at the end of the cylinder but at its centerline, thus overcoming the drawbacks of the known techniques and obtaining the abovementioned advantages.

  Please refer to FIGS. 1 and 2 for the grinding machine.

  The grinding machine 10 comprises a base 11 on which a piece holder / head 13 and a tailstock center 12 are movably mounted, which are connected to the pieceholder / head 13 and the tailstock center 12 during a grinding operation. It serves to move and optionally support the cylinders 14 disposed therebetween.

  More specifically, the grinding machine 10 is of a type in which a cylinder to be processed is supported by two rotation centers 81 and 83 disposed on a piece holder head 13 and a tailstock center 12.

  Lunets 20, 21 and 22 are placed in contact with the cylinder and have the function of providing resistance to bending of the cylinder that can be caused by machining of the cylinder.

  The grinding machine 10 similarly has the function of supporting the entire weight of the cylinder being processed in addition to the above-mentioned functions of the Lunet, while the piece holder / head and the tailstock center rotate the cylinder. It is also possible to have different molds that only have the function of allowing the cylinder to be ground on a grinding wheel or equivalent tool part.

  The piece holder head 13 preferably comprises a single body and can be translated by the presence of two linear guides 80 joined by a suitable sliding block at the bottom.

  The rotation center 81 can be housed inside the body of the piece holder head 13 and in some applications takes the form of a support for the cylinder 14. On the other hand, a motor 71 is arranged at the rear, and the cylinder 14 can be rotated by an associated transmission.

  The tailstock center 12 also comprises a body that can be translated by the presence of two linear guides 80 arranged at the bottom of the structure joined by a suitable sliding block.

  The movable center 83 can be housed within the tailstock center 12 and, in some applications, forms a second support for the cylinder.

  Furthermore, if necessary for the specific application being verified, the tailstock center 12 can house a device that allows pre-mounting with a spring device in the lower part.

  The preliminary mounting acts in the axial direction, guarantees continuous contact between the cylinder and the two movable centers 81, 83, and at the same time, if required for processing, for example when grinding a so-called “thin” cylinder, Axial pre-installation is guaranteed.

  The grinding machine 10 also comprises a grinding wheel that can be moved parallel to the axis of the cylinder, but is not shown for the sake of brevity and because it is known per se in this type of grinding machine itself.

  Both the piece holder head 13 and the tailstock center 12 can be moved linearly along the base 11 and moved towards or away from each other to accommodate cylinders of various lengths. .

  The piece holder head 13 and tailstock center 12 are coupled to moving means that allow movements that are linearly approaching or leaving in the same direction, but in the same direction, but in reverse.

  The moving means of this example comprises a worm screw 16 engaged with both the piece holder head 13 and the tailstock center 12, and when rotated, as shown in FIG. Both the head 13 and the tailstock center 12 are operated so as to approach or leave the same direction in the extension direction of the screw 16.

  For this purpose, the screw 16 is manufactured in one piece and has two screw parts 160 and 161 with which the corresponding female threads of the piece holder head 13 and the tailstock center 12 engage.

  In order to be able to move in the same direction by the same amount, but in reverse, the two threaded portions 160, 161 of the screw 16 have the same pitch, for example a clockwise screw and a counterclockwise screw. Having a counter-wound helical screw.

  Instead of a single screw 16, it can include two separate helical screws with counter-wound screws, or the screw 16 can be separated into two different sections connected to a suitable joint rather than as a single piece. Note that you can.

  The screw 16 is rotated by a motor 17 such as an electric brushless motor.

  By properly arranging the cylinder's lateral and longitudinal centerlines to coincide with the reference point of the grinding machine 10 and operating the screw 16, the piece holder head 13 and the tailstock center 12 can be It can move towards the end and then be coupled and supported by the cylinder.

  This method enables automatic alignment of a kind of cylinder between the piece holder head 13 and the tailstock center 12, and in fact, even if the cylinder is not correctly arranged along the axial direction, Both the piece holder head 13 and the tailstock center 12 move in the same degree and in the same direction but in a reverse direction with respect to a common central reference, so that the movement of the piece holder head 13 and the tailstock center 12 approaches each other. Note that the cylinder can be aligned.

  This particular feature, on the one hand, makes manual mounting of the cylinder easier, safer and faster, and on the other hand makes the adoption of the automatic mounting system mechanism significantly easier to plan.

  The grinding machine 10 can also be provided with a contra or support lunet 20, 21, 22.

  Lunet specifically requires that at least one lunet 20 be present when grinding so-called “thin” cylinders, and generally there are at least three lunets 20, 21 and 22, usually an odd number of lunets. There is a need to. Only in special cases when the cylinder geometry requires it includes the use of an even number of lunets, i.e. without the central lunet. Thus, except for this particular case, the set of renets always includes the central lumnet 20, or more generally includes the central lumnet and the two side lunats 21 and 22, or the four side lunats.

  The cylinder has a lateral / longitudinal central line plane (in the case of “thin”, that is, in the case of a Sendzimir cylinder, often coincides with a plane of symmetry that passes through a common center of gravity and is perpendicular to the cylinder's generatrix). Assembled.

  The central lunet 20 is fixed at a position relative to the grinding machine 10 or the base that is generally placed on the ground, at least in the above-mentioned cases, and in any case the longitudinal center point of the cylinder always corresponds to the central lunet. Therefore, it is not necessary to move even when processing cylinders having different lengths.

  In this regard, the central lunet 20 can be mechanically secured to the grinding machine 10 by, for example, screws or bolts, or can be manufactured integrally with at least a portion of the base 12 and is central for various dimensional measurements and calculations. And a dedicated reference point can be represented.

  Consider, for example, the case of three luminets, where the positions of the side lunats 21, 22 are adjusted manually or in more advanced variants of the grinding machine 10, in particular worm screws or piece holder heads 13 and Connected to the same screw 16 that operates the tailstock center 12 and moves them in the same degree, in the same direction but in reverse, by means of a single and simple movement of the screws to which they are coupled, so that the piece holder head 13 and The risk of mispositioning of the tailstock center 12 can be reduced or eliminated. In this way, in practice, the piece holder head 13 and the tailstock center 12 cannot be located at different distances from the central lunet 20, but are advantageously always equidistant from the central lunet 20.

  In this regard, the deformation is achieved by a single screw action and a series of screw sleeves 90 (one for each device to be moved) as shown in FIGS. 3 and 4 and the lunets 20, 21, 22 and the piece holder head 13 and the core. Including controlling the position of the pedestal center 12.

  Each sleeve 90 includes a cylindrical mantle and is engaged with the worm screw 16 by a screw inside the mantle.

  Each sleeve 90 can also be connected to a unit that is moved by a suitable mechanism. In principle, as an alternative to the brake block system described below, in view of the disclosure provided herein, it will be apparent to those skilled in the art that instead of a brake block, an electromagnet or a locking peg, wedge, It should be noted that other different solutions may be included, such as mechanical coupling means such as removable obstacle profiles, or moving unit blocking means that may be provided with other similar items.

  For illustrative and non-limiting purposes, one of these coupling / separation means is described below.

  The coupling / separating means of the sleeve with respect to the component to be positioned comprises arms 91, 92 pivotally attached to the structure of the component to be moved (piece holder head, tailstock center and lunet). Is provided with engagement ends 93, 94 with sleeve 90 and opposing free ends 95, 96 coupled to actuator 97.

  Actuator 97 is preferably a linear actuator, such as a gas, pneumatic, hydraulic, electric actuator, and in a non-limiting exemplary embodiment, is a hydraulic actuator equipped with a cylinder and a piston variably protruding from the cylinder. .

  The actuator 97 is preferably coupled to the free ends 95 and 96 of the arms 91 and 92 by hinges, and the engagement ends 93 and 94 of the arms 91 and 92 are coupled to the outer cylindrical surface of the sleeve 90. A clamp with a lining for is attached.

  The two arms 91 and 92 have fulcrums for oscillating at points O ′ and O ″ along the main body. When the two free ends 95 and 96 approach each other, the opposite ends 93 and 94 are separated, and vice versa. The same is true.

  The grinding machine 10 preferably comprises a single screw 16 and is attached to both the head 13 and the tailstock center 12 and to the lunets 20, 21, 22 with coupling / separating means each having a specific corresponding sleeve. It is done.

  Thus, there are a plurality of sleeves along the body of the screw, one for each coupling / separating means.

  A function can be derived from what has been described above. When one of the coupling / separating means is actuated to close the lining on the corresponding sleeve, the same component (head, tailstock center or Lunet) of the grinding machine is controlled as a result of the rotation of the screw 16. In translation, and in fact, by rotating the screw 16, the non-rotating sleeve moves along the screw 16 and the arm translates along with the pivotally mounted element. .

  Therefore, with a simple and accurate system, it is possible to move the head, tailstock and lunat to position them correctly on the base 11 and to greatly reduce the set time of the grinding machine 10.

  In addition, in this manner, a single command allows both the lunat and the head and tailstock to be operated simultaneously or separately, greatly increasing the freedom of the grinding machine.

  In short, the connection between each internal thread and the part that is about to move is obtained by a system that operates as follows. When moving certain parts, such as the tailstock center, the block system will constrain the screw sleeve 90 (ie, female thread) to the body of the tailstock center itself and prevent it from rotating at the same time, once activated, the screw will rotate. However, since the female screw is constrained by the tailstock center, it cannot rotate integrally with the screw, so that the tailstock center is translated.

  In contrast, if the tailstock center is constrained and you want to move the piece holder head, it is sufficient to remove the specific sleeve from the tailstock center body and at the same time restrain the piece holder head sleeve. Yes, so that once the screw begins to rotate (in this case trying to move the piece holder head), the tailstock center sleeve rotates together with the screw and maintains the sleeve itself in the same axial position Therefore, the tailstock center does not move at all.

  In this way, either the renette or piece holder head or tailstock center can be easily and quickly activated simultaneously or separately to suitably position and support the cylinder.

Therefore, since there can be various conditions for the movement of the component parts, it is necessary to consider the conditions as an indispensable part of the above method, examples of which are given below.
1) Symmetric positioning of the lunet, piece holder head and tailstock center with respect to the center reference of the grinding machine: if only both lunet internal threads engage with the screw, they depend on the structural type of the worm screw Move backwards the same distance. At the same time, the pieceholder head and tailstock center female threads are separated from the screws and the two groups remain stationary. After positioning the Lunet, the piece holder head and tailstock center are positioned by engaging the female threads and separating the Lunet female threads. This positioning procedure is useful, for example, in the case of grinding a symmetric cylinder (eg a Sendzimir cylinder).
2) Asymmetric positioning of the piece holder head and tailstock center-symmetrical positioning of the Lunet: in this case, the Lunet is positioned simultaneously and engages both the Lunet's internal threads with the screw. Thus, by operating the screw, the Lunet moves in the opposite direction by the same distance. After positioning these two groups, the Lunet internal thread is removed from the screw. At this point, the internal thread of the piece holder head and tailstock center engages the screw instead, moving the first group and then the other group first.
3) Asymmetric positioning of the Lunet, piece holder head and tailstock center with respect to the center line of the cylinder: in this case, each time a group of internal threads is engaged with a screw, the group is positioned and moved there The other group of female screws not involved in the are removed. This procedure is suitable for grinding asymmetric cylinders (typically hot or cold rolled cylinders) or for applications where the piece holder head remains fixed, eg, generally for Sendzimir cylinders. In applications, it is very useful for moving the components.

  Many alternatives to the grinding machine 10 described so far are possible, all of which are considered an integral part of the present invention.

  For example, the moving means for the head 13 and the tailstock center 12 and / or the lunet are manufactured differently, for example using a conveyor belt coupled to a trolley, and the head 13 and tailstock as described above. Movement of the center 12 and / or Lunet can be enabled.

  The moving means can equally be equipped with two separate screws and two motors, although the cost of the grinding machine is higher.

  Advantageously, the center line of the grinding machine 10 as a whole coincides with the center lunet 20 and the cylinder positioning can be made easier and more intuitive.

  Therefore, the object described in the introduction of this description is achieved.

  The scope of the invention is defined by the appended claims.

10: grinding machine 11: base 12: tailstock center 13: piece holder / head 14: cylinder 16: screw (endless screw)
17, 71: Motors 20, 21, 22: Lunet 80: Linear guide 81, 83: Rotation center 90: Sleeve 91, 92: Arm 93, 94: Arm engagement end 95, 96: Arm free end 97 : Actuator 160, 161: Screw part

Claims (10)

A method of positioning an operating cylinder on a grinding machine (10), such as a rolling mill or a paper mill, comprising at least
a. The horizontal / longitudinal centerline plane of the cylinder corresponds to a reference point disposed between the movable piece holder / head (13) and the movable tailstock center (12) of the grinding machine (10). A positioning step;
b. Moving the piece holder head (13) and the tailstock center (12) in the direction of the cylinder until repetitive coupling occurs to entrain and / or support the cylinder itself;
A method comprising the steps of:   Method according to claim 1, characterized in that the reference points are located equidistant from the piece holder head (13) and the tailstock center (12).   The moving step of the step b is a step of moving the piece holder head (13) and the tailstock center (12) in the same amount, in the same direction and in a reverse winding. The method of Claim 1 or Claim 2. A1. Providing a rolling cylinder to be ground;
A. The horizontal / longitudinal centerline plane of the cylinder is arranged between the movable piece holder / head of the grinding machine and the movable tailstock center and corresponds to a reference point which preferably coincides with the support lunet (20) of the cylinder And positioning,
B. Moving the piece holder head (13) and tailstock center (12) until coupled with the cylinder;
C. Positioning at least two side support lunets (21, 22) of the cylinder at the same distance from the reference point;
The method according to claim 1 or 2, characterized by comprising:   For example, a grinding machine (10) for an operating cylinder in a rolling mill or paper mill, the base (11), the piece holder head (13) and the opposite ends of the cylinder for rotating the cylinder to be ground A tailstock center (12) suitable for coupling to the base, wherein the piece holder head (13) and the tailstock center (12) translate relative to the base (11). A grinding machine characterized by being capable of   6. Grinding machine according to claim 5, characterized in that the piece holder head (13) and the tailstock center (12) are coupled to moving means and are capable of linear translation for repeated approach and retraction. .   The said moving means is suitable for moving the piece holder head (13) and the tailstock center (12) in the same direction by the same amount in a reverse winding. The grinding machine described.   The moving means comprises an endless screw (16) coupled to the piece holder head (13) and the tailstock center (12), the screw (16) preferably comprising a single piece, The grinding machine according to claim 6 or 7, comprising two screw parts (160, 161) having a reverse spiral screw.   A luminet (20) for the central contrast of the cylinder and at least two lateral luminets (21, 22) for contrasting and / or supporting the cylinder, wherein the central lumnet (20) comprises the piece holder The grinding machine according to any one of claims 5 to 8, characterized in that it is arranged at a position equidistant from the head (13) and the tailstock center (12).   The moving means with respect to the piece holder head (13) and the tailstock center (12) is moved to the side lunats (21, 22) in order to repeatedly move in the same direction, the same amount, and in the opposite direction. The grinding machine according to claim 9, wherein the grinding machine is coupled.

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