Plant for processing metal bars

Abstract

A plant (10) for threading metal bars, in particular bars for reinforcing concrete, is described herein, comprising a storage unit (2) for storing a plurality of bars to be threaded, the bars being oriented in the longitudinal direction (L) of the unit, at least one pre-processing station (4, 12) for performing pre-processing machining operations on one end of the bars, a threading station (6) for performing threading operations on the prepared end of the bars, and a second storage unit (8) for storing the threaded bars. The plant comprises transport devices (14, 16, 18) for moving the bars from one point to another in the plant, and transfer trucks (44, 124, 64) for feeding the bars to the machine tools of the individual stations.

Description

Technical Field

[0001] The present invention relates to a plant for threading metal bars, in particular bars for reinforcing concrete.

Background Art

[0002] The plants contemplated herein are a storage unit for storing a plurality of bars to be threaded, the bars being arranged facing the longitudinal direction of the unit, a storage unit, and a pretreatment station for performing pretreatment machining operations on one end of the bar, and a threading station for performing threading operations on the pretreated end of the bar, and a second storage unit for storing the threaded bars and comprising.

[0003] Known plants of the type mentioned require the constant presence of a plurality of operators to move the bars from one point of the plant to another (from the storage unit to the various stations and from these downstream to the storage unit) and to control the machine tools of the individual stations.

[0004] In this regard, the present invention relates to plants of the type described above which can present a higher degree of automation and exclude, rather than reduce, the presence of operators during the operation of the plant.

[0005] In particular, the present invention relates to a plant according to claim 1.

[0006] The claims form an essential part of the technical teaching provided herein in relation to the present invention.

Brief Description of the Drawings

[0007] Further features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings, which are provided for illustrative purposes only and are not limiting.

Figure 1

Figure 2

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Figure 6

DETAILED DESCRIPTION OF THE INVENTION

[0008] In the following description, various specific details are set forth in order to provide a thorough understanding of the embodiments. The embodiments may be provided without one or more of the specific details, or with other methods, components, materials, etc. In other cases, well-known structures, materials, or operations have not been shown or described in detail so as not to obscure various aspects of the embodiments.

[0009] The references used in this specification are provided for convenience only and thus do not define the scope of protection or the scope of the embodiments.

[0010] With reference to FIG. 1, the plant described in this specification is generally indicated by reference numeral 10, A storage unit 2 for storing a plurality of bars to be threaded, the bars being arranged in the longitudinal direction L of the unit, the storage unit 2, A pretreatment station 4 for performing a pretreatment machining operation on one end of the bar, A threading station 6 for performing a threading operation on the pretreated end of the bar, a second storage unit 8 for storing the threaded bar and comprises.

[0011] The threading operation can be constituted by any of the machining operations known in the art for threading the ends of bars, particularly bars for reinforcing concrete. Among the machining operations currently used, there may be mentioned roller threading, threading by removal of material (with or without forging), threading via friction stir welding, and the like.

[0012] The pre-treatment station 4 performs a machining operation designed to prepare the bars under preset conditions before performing the threading operation on them.

[0013] Generally, the pre-treatment station described above performs the cutting of the bars either to trim them to a size for obtaining a plurality of bars of shorter lengths from a bar cut, for example, to a length of 12 meters or longer, or to cut them. In the latter case, the cutting station may have a second moving track (not shown) for receiving a portion of the cut bar, this second track being aligned with track 44 and extending on the opposite side of the cutting machine 42. This portion of the cut bar is then returned to track 44 to proceed to the next station when track 44 is released from the other portion of the bar obtained from the cutting.

[0014] Generally, the cutting station 4 has a cutting machine 42 pre-configured with a cutting member selectable from, for example, a guillotine, a band saw or a rotary cutting disk.

[0015] The plant 10 may further have additional stations according to the requirements of a particular application. For example, according to the envisaged threading operation, the plant may have an additional pre-treatment station upstream of the threading station.

[0016] In the illustrated example, the plant 10 includes a forging station 12 disposed between the pretreatment station 4 and the threading station 6, and the forging station 12 performs a cold machining operation on the ends of the bars such that those portions are expanded under the action of compression. In this way, at the threading station, it is possible to obtain a threaded end having an inner diameter that is the same as the original diameter of the bar and not a smaller diameter.

[0017] The pretreatment station 4 generally includes a pretreatment machine 42 designed to perform a pretreatment machining operation on one end of the bar, and a moving track 44 for moving the bar that has reached the pretreatment station in accordance with the longitudinal movement of the bar, in order to send the end of the bar to the pretreatment machine 42 and pull the bar out of the pretreatment machine after pretreatment. is provided.

[0018] Similarly, the threading station 6 includes a threading machine 62 designed to perform a threading operation on one end of the bar, and a moving track 64 for moving the bar that has reached the threading station in accordance with the longitudinal movement of the bar, in order to send the end of the bar to the threading machine 62 and pull the bar out of the threading machine after threading. has.

[0019] A similar configuration is also assumed for the forging station 12, which has a forging machine 122 and a moving track 124.

[0020] With respect to FIG. 2, the storage unit 2, the moving tracks 44, 64, 124 of the various stations, and the second storage unit 8 are arranged parallel to each other. The machines of the various stations are all located on the same side (the left side as seen in the illustrated example) at one end of the corresponding moving track.

[0021] In a certain direction, as the metal bars are received by the storage unit 2, their longitudinal axes are parallel to the longitudinal direction L of the unit 2 itself, and, similarly, at all stations of the plant, within the second storage unit 8 as well, and while they are moving from one point to another in the plant 10, this direction is maintained.

[0022] The plant 10 comprises a conveying device 14 for moving the bars from the pre-treatment station 4 to the forging station 12 in a direction T transverse to the direction L and to the longitudinal axes of the bars themselves. Further, the conveying devices 16, 18 move the bars from the forging station 12 to the threading station 6 and from the threading station 6 to the second storage unit 8, respectively, in the same way.

[0023] In a preferred embodiment, as shown in the illustration, each of the conveying devices referred to may have an inclined plane 102 that allows the bars to roll by gravity from upstream of the unit or station to downstream of the station or unit, and a series of vibrating arms 104, which are arranged at the bottom of the moving track upstream of the station and can operate to be lifted above the track in order to lower the bars existing on the track onto the inclined plane 102. In a preferred embodiment, as shown in the illustration, the plane 102 is inclined downward and is defined by a plurality of beams 102' that are parallel to each other and to the direction T. The arms 104 are mounted and vibrate on respective surfaces that are parallel to each other and orthogonal to the direction L. Preferably, the arms 104 are rotatably mounted around exactly the same axis I parallel to the direction L. FIG. 1 shows the arms 104 in a position lifted above each moving track in order to lower the bars onto the respective surfaces 102 directly adjacent thereto.

[0024] With respect to FIG. 1, the storage unit 2 has a support surface P on which the rods contained in the unit 2 are placed, and the support surface P extends in the direction T within a range near the moving track 44 of the preprocessing station 4. The surface P ends with an inclined surface P', and is arranged in a state of connecting the support surface P to the moving track 44.

[0025] The transfer of the rods from the surface P to the track 44 is often manually performed by an operator, and the inclined surface P' is utilized to roll the rods along the track 44 by gravity. Further, the means is operably associated with the surface P, and is, for example, a vibration member designed to be convenient for unwinding the entanglement of the rods and advancing them toward the inclined surface P'.

[0026] In an alternative embodiment, the plant 10 may have a lifting device (for example, a pincer lifting device or a magnet lifting device) for individually transporting the rods from the storage unit 2 to the track 44 of the preprocessing station 4.

[0027] During operation, the rods that reach the track 44 are thereby sent to the preprocessing machine 42 for performing preprocessing machining operations, and then, by the track itself, are returned to a position reset at a distance from the machine 42 for subsequent movement of the rods toward the forging station 12.

[0028] As described above, the transfer from the track 44 to the track 124 is managed through the operation of the arm 104 associated with the track 44. The arm 104 lifts the rod onto the track 44 itself, thereby rolling it along the inclined surface 102.

[0029] This sequence is repeated at all stations of the plant in an overall automated manner without the need for operator intervention to start any stage of the described process.

[0030] Finally, from the threading station 6, the bar is moved directly to the storage unit 8.

[0031] The plant 10 comprises a series of sensors located at various points of the plant to detect the presence and / or passage of the bar. Further, the plant 10 comprises a control unit configured to manage the various devices and apparatuses of the plant based on the signals received from the aforementioned sensors in order to ensure the sequence of movements and machining operations described above. The aforementioned control unit may be composed of a plurality of individual control modules, each configured to execute each stage or operation of the process described herein. This control unit may further be divided according to a hierarchical order such that one or more main control units manage one or more secondary control units.

[0032] In any case, for example, it is possible to envisage an embodiment of the plant in which one or more operations are carried out under the supervision of an operator, and push buttons are provided to enable the operations.

[0033] For illustrative purposes, with respect to the threading station 6, the plant is assumed to have a first sensor (not shown) designed to detect the approach of the bar, moved by the truck 64, to the threading machine 62. When a confirmation signal is received by the aforementioned sensor, the control unit activates the threading machine 62 and positions the bar under preset conditions for receiving it. A further sensor (not shown) sends a confirmation signal to the control unit regarding the receipt of the bar by the threading machine 62. At this point, the control unit manages the machine 62 for the execution of the threading operation.

[0034] The control unit may be configured to manage the movement track 64 according to at least two different movement speeds, the higher one being for the rapid movement of the bar towards or away from the threading machine, and the substantially lower one being for the final positioning of the bar within the threading machine 62. In this regard, the movement track may either assist the means of the threading machine that performs the final positioning of the bar, or the track itself may perform the positioning by itself. In some embodiments, it may be advantageous to assume two or more movement speeds of the bar towards or away from the threading machine, for example, gradually decreasing or increasing as the bar moves in the direction of approaching or leaving the machine.

[0035] In a preferred embodiment, as shown in the illustration (Figure 6), while the bar is being moved towards the threading machine by the track itself, in order to bring the end of the bar closer to the reference direction of the threading machine 62, a retraction block 61 is used, preferably using a conical surface or various types of wedge-shaped ones, and the movement track 64 is provided at its end adjacent to the threading station 6. In order to perform a similar function for the movement track 124 for the pre-treatment station 12, it may be provided with the aforementioned retraction block. As predicted above, after the threading operation is completed, the threaded bar is returned by the track 64 to a position set at a distance from the threading machine 62, and then is moved towards the storage unit 8 using the transport device 18. The control unit simultaneously regards a signal for activating the vibration arm 104 associated with the movement track of the threading station as a signal for enabling the activation of the vibration arm 104 associated with the movement track upstream of the forging station 12.

[0036] Generally, in practice, it should be noted that the plant's control unit is preferably configured to provide process control in which the control of a given station or conveying device is based on the operations at the station or downstream of the device. This means, for example, that the forging station does not lower the bar until the threading station does the same.

[0037] In various preferred embodiments, the moving track 64 is a track having motor-driven rollers.

[0038] Preferably, each roller has an outer surface with a concave shape for centering the bar on the track in which the bar is received in plan view (see roller 64A in the front view of track 64 shown in FIG. 5). Again, preferably, the aforementioned roller track may include a set of rollers located near the threading machine that can be adjusted to a vertical position.

[0039] Again, in a preferred embodiment, the moving track comprises a set of clutch units designed to disengage the rollers from the drive motor for each roller to obtain an idle state of the rollers. This state can be brought about when the bar is engaged by the threading machine to prevent sliding between the bar and the rollers, which can cause damage or rapid wear of the rollers themselves when the bar is being manipulated by the threading machine.

[0040] In an alternative embodiment, the moving track may have a simple sliding surface and a pusher or puller member designed to push or pull the bar along this surface.

[0041] Here, it should be noted that for each of the machining stations of the plant 10, the above-described characteristics can be equally reproduced.

[0042] In a preferred embodiment, as shown in the illustration, the inclined surface 102 of the conveying device 18 connecting the threading station 6 to the storage unit 8 has a much smoother inclination than the surface 102 of other devices. In particular, the inclined surface 102 of the conveying device 18 preferably has a perfectly smooth inclination in such a way that the individual rods rolling thereon can be easily stopped by the operator for performing tests thereon, such as screwing the threaded body to the threaded end of the rod.

[0043] Referring now to the embodiment of FIG. 3, the plant 10 may have a conveying device 22 disposed between the storage unit 2 and the pre-treatment station 4 and designed to constitute a unit for accumulating rods. In a manner known per se, the device 22 has a ring member defining an upper working branch and a bottom return branch, and a plurality of compartments 22A are defined.

[0044] During operation, all of the compartments 22A in the upper branch can be filled with rods for loading into the entire device. Incidentally, it should be noted that the above-described loading operation is very fast in itself, even if it is performed manually, for example, during the cutting operation performed by the station 4 on the rods previously sent therein.

[0045] When the station 4 finishes its work and the machined rods are sent downstream of the station, the device 22 can directly supply new rods to be processed to the station 4. In this way, the cycle time for picking up rods from the storage unit 2 is masked. Furthermore, the operator can thereby move freely away from the storage unit and can concentrate on performing tests, for example, on already threaded rods by themselves.

[0046] A conveying device similar to that just described may further be arranged between the pre-treatment station 4 and the forging station 12, between the forging station 12 and the threading station 6, and similarly between the threading station 6 and the storage unit 8.

[0047] In some applications, for example, if the bar has a particular section or protrusion, there may be a need to place the bar in the appropriate position on the machine tool in a preset orientation relative to the longitudinal axis of the bar. For these applications, one or more of the conveying devices may, instead of the arm 104 and the inclined plane 102 described above, have a member movable in the direction T, for example a sliding member, and be configured to move the bar around its own longitudinal axis without changing its direction. In a preferred embodiment, the conveying device preconfigured to hold the bar in exactly the same direction may comprise a walking beam system.

[0048] Finally, FIG. 4 shows an embodiment in which the plant 10 comprises two threading lines 100A, 100B, each having the same stations and the same devices as described above with respect to FIGS. 1 and 2, and being symmetrically arranged on opposite sides of a common storage unit 2 designed to feed bars to both of the two threading lines. In an alternative embodiment, the two threading lines 100A and 100B may instead be arranged along the end regions on opposite sides of the storage unit 2. In this case, the storage unit 2 itself may envisage a roller track for feeding bars to one and the other of the two threading lines. Alternatively, the storage unit may present a suitable extension for dropping the bars laterally onto the two threading lines. In yet a further embodiment, the plant may envisage only one second threading station and a further storage unit in which the threaded bars coming from the second threading station are collected.

[0049] In a further embodiment, the plant described herein may be preconfigured to perform the machining operations described above on both ends of exactly the same bar. Preferably, for this purpose, each station of the plant may comprise a second working machine arranged at the opposite end of the corresponding roller track with respect to the one where the first working machine is located (see Figure 1).

[0050] Of course, without prejudice to the principles of the invention, the construction details and embodiments may vary, even significantly, from those shown herein for the sole purpose of non-limiting illustration, since they are defined by the appended claims and thus without departing from the scope of the invention. According to this specification, the following items are also disclosed. [Item 1] A plant for threading metal bars, particularly bars for reinforcing concrete, comprising: A storage unit for storing a plurality of bars to be threaded, the bars being arranged facing the longitudinal direction of the storage unit; At least one pre-treatment station for performing pre-treatment machining operations on one end of the bar; A threading station for performing threading operations on the pre-treated end of the bar; A second storage unit for storing the threaded bars; And comprising: The plant further comprises: At least one first conveying device for moving the bar from the at least one pre-treatment station to the threading station according to movement in a direction transverse to the longitudinal direction; A second conveying device for moving the bar from the threading station to the second storage unit according to movement in a direction transverse to the longitudinal direction; And comprising: The pre-treatment station comprises: A pre-treatment machine designed to perform pre-treatment machining operations on one end of the bar; A moving track for moving the end of the bar to the pre-treatment machine according to movement in a direction parallel to the longitudinal direction, for sending the bar that has reached the pre-treatment station after the bar has been pre-treated and for pulling the bar out of the pre-treatment machine; And having: The threading station comprises: A threading machine designed to perform threading operations on one end of the bar; A moving track for moving the bar that has reached the threading station according to movement in a direction parallel to the longitudinal direction, for sending the end of the bar to the threading machine and for pulling the bar out of the threading machine after the bar has been threaded; A plant. [Item 2] A plurality of sensors for detecting the presence or passage of a bar on the moving track of the pretreatment station and / or the moving track of the threading station, on the pretreatment machine and / or the threading machine, respectively, and a plurality of bars picked up from the storage unit are successively subjected to pretreatment and threading for one end of one bar, and in the second storage unit, the threaded bars are successively collected. A control unit configured in advance for receiving signals generated by the plurality of sensors and for controlling the first transfer device, the second transfer device, the pretreatment machine, and the threading machine, of the plant according to item 1. [Item 3] The at least one first transfer device has an inclined surface that allows the bar to roll by gravity from the pretreatment station to the threading station or from the pretreatment station to a further subsequent pretreatment station, and a series of vibrating arms arranged below the moving track of the pretreatment station and operable to be lifted above the moving track to lower the bar present on the moving track onto the inclined surface, of the plant according to item 1 or item 2. [Item 4] The second transfer device has an inclined surface that allows the bar to roll by gravity from the threading station to the second storage unit, and a series of vibrating arms arranged below the moving track of the threading station and operable to be lifted above the moving track to lower the bar present on the moving track onto the inclined surface, of the plant according to item 1 or item 2. [Item 5] The pretreatment station and / or the threading station has a retraction block for bringing the end of the bar closer to the pretreatment machine and / or the threading machine in a reference direction of the pretreatment machine and / or the threading machine, and the retraction block is configured to act on the bar moved by the moving track of the station according to the movement in a direction parallel to the longitudinal direction, of the plant according to item 1. [Item 6] The moving track of the pretreatment station and / or the threading station has a plurality of motor-driven rotatable rollers, each having an outer surface with a concave shape for centering the bar received on the moving track in plan view, the plant according to any one of items 1 to 5. [Item 7] The moving track of the pretreatment station and / or the threading station is a plurality of motor-driven rotatable rollers, near the pretreatment station or near the threading station, the set of rollers being vertically adjustable, the plant according to any one of items 1 to 6 having a plurality of motor-driven rotatable rollers. [Item 8] The moving track of the pretreatment station and / or the threading station has a plurality of motor-driven rotatable rollers, and the control unit is configured to drive the rollers according to a first operating speed for moving the bar towards or away from the pretreatment machine and / or the threading machine, and according to a second operating speed slower than the first operating speed for assisting the pretreatment machine and / or the threading machine when positioning the bar at a preset position for performing the pretreatment machine processing operation or the threading operation, the plant according to any one of items 1 to 7. [Item 9] A conveying device for moving the bar from the storage unit to the at least one pretreatment station according to movement in a direction transverse to the longitudinal direction, the conveying device having an endless moving member, the endless moving member having a plurality of compartments parallel to the longitudinal direction and oriented in a direction transverse to the direction of movement, the endless moving member extending between the storage unit and the at least one pretreatment station and having branches connecting them together, the plant according to any one of items 1 to 8. [Item 10] The at least one first conveying device and / or the second conveying device has an endless loop moving member, and a plurality of sections parallel to the longitudinal direction and facing in a direction transverse to the direction of movement are provided on the endless loop moving member, and the pre-treatment station and the threading station, or the pre-treatment station and a further subsequent pre-treatment station, or the threading station and the second storage unit, and has a branch that spreads and is connected together, the plant according to any one of items 1 to 9. [Item 11] The at least one first conveying device has a movable surface in the direction of movement in order to move the bar from the pre-treatment station to the threading station or from the pre-treatment station to a further subsequent pre-treatment station without changing the direction of the bar around its own longitudinal axis, the plant according to item 1. [Item 12] The second conveying device is preconfigured to move the bar at a conveying speed slower than the conveying speed of the at least one first conveying device, the plant according to any one of items 1 to 11. [Item 13] The pre-treatment station is a cutting station, and the cutting machine of the cutting station has a cutting member selected from a shearing machine, a band saw or a rotary cutting disk, the plant according to any one of items 1 to 12. [Item 14] The at least one pre-treatment station has a cutting station and a subsequent forging station, and is arranged downstream of the cutting station with respect to the direction of movement of the bar, the plant according to any one of items 1 to 13. [Item 15] The cutting station has a second moving track that spreads in the direction of movement parallel to the longitudinal direction on the side opposite to the first moving track with respect to the cutting machine in order to receive a part of the cut bar, the plant according to item 13. [Item 16] A second threading station, A third storage unit for storing the threaded bar, At least one third conveying device for moving the bar from the pre-treatment station or a further pre-treatment station to the second threading station according to movement in a direction transverse to the longitudinal direction, A fourth conveying device for moving the rod from the second threading station to the third storage unit in a direction transverse to the longitudinal direction is provided, wherein the second threading station is a threading machine designed to perform a threading operation on one end of the rod, and a moving track for moving the rod that has reached the threading station in a direction parallel to the longitudinal direction to feed the end of the rod to the threading machine and to pull out the rod from the threading machine after the rod has been threaded The plant according to any one of items 1 to 15, having.

Claims

1. A plant for threading a rod, comprising: A storage unit for storing a plurality of rods to be threaded, wherein the rods are arranged facing the longitudinal direction of the storage unit; At least one pre-treatment station for performing a pre-treatment machining operation on one end of the rod; A threading station for performing a threading operation on the pre-treated end of the rod; A second storage unit for storing the threaded rods; And comprising: The plant further comprises: At least one first transfer device for moving the rod from the at least one pre-treatment station to the threading station according to movement in a direction transverse to the longitudinal direction; A second transfer device for moving the rod from the threading station to the second storage unit according to movement in a direction transverse to the longitudinal direction; And comprising: The pre-treatment station comprises: A pre-treatment machine designed to perform a pre-treatment machining operation on one end of the rod; A moving track for moving the end of the rod to the pre-treatment machine according to movement in a direction parallel to the longitudinal direction, for sending the rod that has reached the pre-treatment station after the rod has been pre-treated and for pulling the rod out of the pre-treatment machine; And having: The threading station comprises: A threading machine designed to perform a threading operation on one end of the rod; A moving track for moving the rod that has reached the threading station according to movement in a direction parallel to the longitudinal direction, for sending the end of the rod to the threading machine after the rod has been threaded and for pulling the rod out of the threading machine; And having: The moving track of the pre-treatment station and / or the threading station has rollers that can be rotated by a plurality of motors, and the control unit moves the rod towards or away from the pre-treatment machine and / or the threading machine according to a first operating speed for moving the rod, and when positioning the rod at a preset position for performing the pre-treatment machine processing operation or the threading operation, the control unit drives the rollers according to a second operating speed that is slower than the first operating speed for assisting the pre-treatment machine and / or the threading machine. A plant configured to do so. **Claim 2**: A plant for threading a rod, A storage unit for storing a plurality of rods to be threaded, the rods being arranged facing the longitudinal direction of the storage unit, and the storage unit; At least one pre-treatment station for performing a pre-treatment machine processing operation on one end of the rod; A threading station for performing a threading operation on the pre-treated end of the rod; A second storage unit for storing the threaded rod Comprising The plant is At least one first conveying device for moving the rod from the at least one pre-treatment station to the threading station according to movement in a direction transverse to the longitudinal direction; A second conveying device for moving the rod from the threading station to the second storage unit according to movement in a direction transverse to the longitudinal direction Comprising The pre-treatment station is A pre-treatment machine designed to perform a pre-treatment machine processing operation on one end of the rod; A moving track for moving the end of the rod to the pre-treatment machine according to movement in a direction parallel to the longitudinal direction in order to send the rod that has reached the pre-treatment station and to pull out the rod from the pre-treatment machine after the rod has been pre-treated. Having The threading station is A threading machine designed to perform a threading operation on one end of the rod; To feed the end of the bar to the threading machine and to pull the bar out of the threading machine after the bar has been threaded, a moving track for moving the bar that has reached the threading station in a direction parallel to the longitudinal direction and having The pre-treatment station and / or the threading station have a retraction block for bringing the end of the bar closer to the pre-treatment machine and / or the threading machine in the reference direction of the pre-treatment machine and / or the threading machine. The retraction block is configured to act on the bar moved by the moving track of the station in a direction parallel to the longitudinal direction. A plant. **Claim 3**: A plant for threading a bar, A storage unit for storing a plurality of bars to be threaded, the bars being arranged facing the longitudinal direction of the storage unit, a storage unit; At least one pre-treatment station for performing pre-treatment machining operations on one end of the bar; A threading station for performing threading operations on the pre-treated end of the bar; A second storage unit for storing the threaded bar and comprising The plant At least one first conveying device for moving the bar from the at least one pre-treatment station to the threading station in accordance with movement in a direction transverse to the longitudinal direction; A second conveying device for moving the bar from the threading station to the second storage unit in accordance with movement in a direction transverse to the longitudinal direction and comprising The pre-treatment station A pre-treatment machine designed to perform pre-treatment machining operations on one end of the bar; To feed the bar that has reached the pre-treatment station, after the bar has been pre-treated, to pull the bar out of the pre-treatment machine, a moving track for moving the end of the bar to the pre-treatment machine in a direction parallel to the longitudinal direction and having The threading station A threading machine designed to perform threading operations on one end of the bar; A moving track for moving the bar that has reached the threading station in a direction parallel to the longitudinal direction, for sending the end portion of the bar to the threading machine and for pulling the bar out of the threading machine after the bar has been threaded and having The moving track of the preprocessing station and / or the threading station has a plurality of motor-driven rotatable rollers, each having an outer surface with a concave shape for centering the bar received on the moving track in a plan view, a plant.

4. A plant for threading a bar, A storage unit for storing a plurality of bars to be threaded, the bars being arranged facing the longitudinal direction of the storage unit, a storage unit, At least one preprocessing station for performing preprocessing machining operations on one end portion of the bar, A threading station for performing threading operations on the preprocessed end portion of the bar, A second storage unit for storing the threaded bar and comprising The plant is At least one first conveying device for moving the bar from the at least one preprocessing station to the threading station in accordance with movement in a direction transverse to the longitudinal direction, A second conveying device for moving the bar from the threading station to the second storage unit in accordance with movement in a direction transverse to the longitudinal direction and comprising The preprocessing station is A preprocessing machine designed to perform preprocessing machining operations on one end portion of the bar, A moving track for moving the end portion of the bar to the preprocessing machine in a direction parallel to the longitudinal direction, for sending the bar that has reached the preprocessing station and for pulling the bar out of the preprocessing machine after the bar has been preprocessed and having The threading station is A threading machine designed to perform threading operations on one end portion of the bar, A moving track for moving the bar that has reached the threading station in a direction parallel to the longitudinal direction, for sending the end portion of the bar to the threading machine and for pulling the bar out of the threading machine after the bar has been threaded and having The moving tracks of the pre-treatment station and / or the threading station are rollers rotatable by a plurality of motors, and near the pre-treatment station or near the threading station, a set of the rollers can be adjusted to a vertical position, and the plant has a plurality of motors-driven rotatable rollers.

5. A plant for threading bars, a storage unit for storing a plurality of bars to be threaded, the bars being arranged facing the longitudinal direction of the storage unit, and the storage unit; at least one pre-treatment station for performing pre-treatment machining operations on one end of the bar; a threading station for performing threading operations on the pre-treated end of the bar; a second storage unit for storing the threaded bars; a transport device for moving the bars from the storage unit to the at least one pre-treatment station according to movement in a direction transverse to the longitudinal direction and comprising The plant at least one first transport device for moving the bars from the at least one pre-treatment station to the threading station according to movement in a direction transverse to the longitudinal direction; a second transport device for moving the bars from the threading station to the second storage unit according to movement in a direction transverse to the longitudinal direction and comprising The pre-treatment station a pre-treatment machine designed to perform pre-treatment machining operations on one end of the bar; a moving track for moving the end of the bar to the pre-treatment machine according to movement in a direction parallel to the longitudinal direction in order to send the bar that has reached the pre-treatment station and to pull out the bar from the pre-treatment machine after the bar has been pre-treated and having The threading station a threading machine designed to perform threading operations on one end of the bar; a moving track for moving the bar that has reached the threading station to the threading station according to movement in a direction parallel to the longitudinal direction in order to send the end of the bar to the threading machine and to pull out the bar from the threading machine after the bar has been threaded and having The conveying device has an endless loop moving member, and a plurality of compartments parallel to the longitudinal direction and facing in a direction transverse to the longitudinal direction are provided on the endless loop moving member. The endless loop moving member extends between the storage unit and the at least one preprocessing station and has branches that connect to each other, forming a plant. **Claim 6**: A plant for threading rods, a storage unit for storing a plurality of rods to be threaded, the rods being arranged facing the longitudinal direction of the storage unit, the storage unit, and at least one preprocessing station for performing preprocessing machining operations on one end of the rod, a threading station for performing threading operations on the preprocessed end of the rod, and a second storage unit for storing the threaded rods comprising: The plant at least one first conveying device for moving the rod from the at least one preprocessing station to the threading station according to movement in a direction transverse to the longitudinal direction, and a second conveying device for moving the rod from the threading station to the second storage unit according to movement in a direction transverse to the longitudinal direction. comprising: The preprocessing station a preprocessing machine designed to perform preprocessing machining operations on one end of the rod, a moving track for moving the end of the rod to the preprocessing machine according to movement in a direction parallel to the longitudinal direction in order to send the rod that has reached the preprocessing station and to pull out the rod from the preprocessing machine after the rod has been preprocessed. having: The threading station a threading machine designed to perform threading operations on one end of the rod, a moving track for moving the rod that has reached the threading station to the threading station according to movement in a direction parallel to the longitudinal direction in order to send the end of the rod to the threading machine and to pull out the rod from the threading machine after the rod has been threaded. having: The at least one first conveying device and / or the second conveying device has an endless loop moving member, and a plurality of compartments that are parallel to the longitudinal direction and are oriented in a direction transverse to the longitudinal direction are provided on the endless loop moving member, and the plant has branches that extend between and are connected to the preprocessing station and the threading station, or the preprocessing station and a further subsequent preprocessing station, or the threading station and the second storage unit.

7. A plurality of sensors for detecting the presence or passage of bars on the moving track of the preprocessing station and / or the moving track of the threading station, on the preprocessing machine and / or the threading machine, respectively, and a plurality of bars picked up from the storage unit are successively preprocessed and threaded for one end of one bar, and in the second storage unit, the threaded bars are successively collected. A control unit configured in advance for receiving signals generated by the plurality of sensors and for controlling the first conveying device, the second conveying device, the preprocessing machine, and the threading machine. The plant according to any one of claims 1 to 6.

8. The at least one first conveying device has an inclined surface that allows the bar to roll by gravity from the preprocessing station to the threading station or from the preprocessing station to a further subsequent preprocessing station, and a series of vibrating arms arranged below the moving track of the preprocessing station and operable to be lifted above the moving track to lower the bar present on the moving track onto the inclined surface. The plant according to any one of claims 1 to 7.

9. The second conveying device has an inclined surface that allows the bar to roll by gravity from the threading station to the second storage unit, and a series of vibrating arms arranged below the moving track of the threading station and operable to be lifted above the moving track to lower the bar present on the moving track onto the inclined surface. The plant according to any one of claims 1 to 7.

10. The at least one first conveying device has a surface movable in a direction transverse to the longitudinal direction in order to move the bar from the pre-treatment station to the threading station or from the pre-treatment station to a further subsequent pre-treatment station without changing the orientation of the longitudinal axis of the bar. The plant according to any one of claims 1 to 6.

11. The second conveying device is preconfigured to move the bar at a conveying speed slower than the conveying speed of the at least one first conveying device. The plant according to any one of claims 1 to 10.

12. The pre-treatment station is a cutting station, and the cutting machine of the cutting station has a cutting member selected from a guillotine, a band saw or a rotary cutting disk. The plant according to any one of claims 1 to 11.

13. The at least one pre-treatment station has a cutting station and a subsequent forging station, and is arranged downstream of the cutting station with respect to a direction transverse to the longitudinal direction of the bar. The plant according to any one of claims 1 to 12.

14. The cutting station has a second moving track extending in a direction parallel to the longitudinal direction on the side opposite to the first moving track with respect to the cutting machine in order to receive a part of the cut bar. The plant according to claim 12.

15. A second threading station, A third storage unit for storing the threaded bar, At least one third conveying device for moving the bar from the pre-treatment station or a further pre-treatment station to the second threading station according to movement in a direction transverse to the longitudinal direction, A fourth conveying device for moving the bar from the second threading station to the third storage unit according to movement in a direction transverse to the longitudinal direction Comprising, The second threading station is A threading machine designed to perform a threading operation on one end of the bar A moving track for moving the bar that has reached the thread cutting station in a direction parallel to the longitudinal direction in order to feed the end of the bar to the thread cutting machine and to pull the bar out of the thread cutting machine after the bar has been thread cut A plant according to any one of claims 1 to 14, having

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