Device for replacing restraint rolling ring nut
The invention relates to rolling production, in particular to a device to replace the nuts that hold the rolling ring on the axis. The inventive device for replacing restraint rolling ring nuts on the console installed with the threads for the nut to the axis of the roll by means of a substitute device that replaces the device comprises a threaded nut, which is threaded, coinciding with the thread axis of the roll, and centering devices for coaxial mounting on the axis of the roll, while the threaded sleeve mounted for axial movement relative to the centering device and/or the axis of the roll and secured against rotation. The invention provides relief dismantling replaceable nut and installation of a new nut. 9 C.p. f-crystals, 6 ill. To reduce the need for time to change the rolls of rolling mills and similar components known use of replacement devices, which fail to rolling stands and which facilitate the dismantling of the replaceable component or install new component (EP-A-142879). The invention relates to a device for facilitating the replacement of the nuts that holds the rolling ring on the console installed the axis of the roll, with the tension rolling rings and as a consequence bulky and heavy and require precise processing (EP-IN-343440).This is done through signs p. 1 claims and mainly the characteristics of the dependent claims. In accordance with this device to replace this nut includes replacement device, which contains the threaded bushing, bearing a thread matching the thread of the axis of the roll. In this sleeve is stick to the axis of the roller nut. The threaded sleeve is equipped with centering devices for coaxial mounting on the axle of the roll. In order that the nut can be screw from under the sleeve to the roll axis, the sleeve is locked in rotation relative to the centering device and/or the axis of the roll. For example, between the sleeve and the centering device can be a safeguard against rotation or friction closure. The centering device as such secured against rotation, for example due to its connection with the carrying device or by a geometric or frictional circuit with the axis of the roll. In order that the nut can be easily unscrewed from the sleeve and screw on the axle of the roller is required to be precisely aligned relative position between the threads of the sleeve and the nut. To avoid this structurally complex negotiation invention provides, ctose roll. As soon as the nut while loosening with the sleeve reaches the thread axis, it is due to this axial movement of the sleeve will occupy an axial position that is appropriate to the thread axis. Mostly threaded sleeve mounted for axial movement so that the locking of the rotation of the threaded sleeve is easily ensured the unscrewing of the nut. It is also possible that the locking of the rotation was created friction force, torque higher than the torque exerted by loosening the nuts on the threaded sleeve. Instead of axial movement is also possible rotational movement of the threaded sleeve.For the centering device of the prior art provides many opportunities to perform. Especially preferred is that the centering device is formed by a bearing spacer, tense to the end of the axis of the roll replacement shaft. The axial displacement of the threaded sleeve carried out to a height of at least one turn of the thread. It is advisable it is held by spring force within the area of its axial movement in the initial position, from which you can movement deviations required by ingestion of the nut thread to the thread axis. If the thread is made so that the case of the EP, the threaded sleeve is pushed away by the force of the spring to its original position, from which it may deviate in both directions. In another implementation, the device is constructed so that the sleeve is displaced by the force of the spring to its original position at the end of their displacement from the axis, and that when the cart centering device to the end of the axis end of the nut thread fits under the action of the force of the spring to the end of the thread axis, and the sleeve more or less backwards under the action of a spring force.Replacement device according to the invention can be used even when it is only about replacing the nut. But, as a rule, it is, furthermore, equipped for the installation or replacement of other components, in particular for replacement of other nuts and, if necessary, rolling rings. In this case, several hycosamine devices, the axes of which coincide with the axes of the rolls are connected to each other their carrier frame. To the centering device, in spite of the tolerance of the position, could take its exact end position corresponding to the axis of the roll, they are installed with the possibility of axial movement and are fastened to the frame by means of springs with axial tension. Frame set then prosalkov.The replacement device is provided not only for installation but also for desoldering components of the rolling mill. In relation to the dismantling of rolling rings should be noted that they are even after loosening the lock nuts are still strongly linked with the axis of the roll and therefore to mitigate this clutch should be put in high effort, before they could be removed from the axis of the roll with the application of a smaller force. So no need to attach to the replacement device is very high effort needed to loosen the clutch rolling rings according to the invention a device for weakening the rolling ring is located on the axis of the roll and executed on facing away from the free end of the axis of the roll side of the rolling ring in the form of a cylinder and piston unit. The latter is part of a ring mounted between the rolling ring and the belt axis of the roll.The invention is explained in more detail below with reference to the drawings illustrating a preferred example of execution. The drawings depicted: - Fig.1 is a partial view of rolling stands with the two adjacent rollers; - Fig.2 - a device for pre-Assembly; - Fig.3 - device according to Fig.1 with fitted replacement of mouth is sstube; - Fig.6 is schematically scan of the nut thread and the axis of the roll.Rolling mill includes shown only partially and schematically a frame 1, which are parallel to each other perform 2-axes of the rolls, bearing interacting with each other, is provided on the circumference of the rolling profile (not shown) rolling ring 3. In the rolling mode axis 2 are rotated synchronously toward each other. Near base 1 they have a belt 4, which adjoins the inner support ring 5, which supports the inner end side of the rolling ring 3. With the frame 1 is firmly connected to the sealing collar 6, which, together with the support ring 5 forms a sealing device 7.For centering of the rolling ring 3 axis 2 of the roll is in the area of the rolling ring conical segment 8, which is seated a conical sleeve 9, interacting with the possibility of alignment with the inner circumference surface of the rolling ring 3. The details of this device are known and therefore do not require more detailed explanation. To the outer end side of the rolling ring 3 by a nut 11 is pressed outer ring 10. The threaded nut 11 interacts with the thread 13 of the axis of the roll. In assembled condition, the rolling ring 3 is squeezed axis 2 of the roll.The nut 11 has at its end surface, interacting with the outside support ring 10, the annular piston 14, which through the channel 15 and the connecting nipple 16 may be connected with a source of oil under pressure (not shown). Once when mounting details collected are depicted by way of the annular piston 14 load pressure, causing the outer ring 10 is loaded with a given clamping force. Then this state is fixed by turning the wedge rings 18 mounted between the end surfaces of the nut 11 and the support ring 10. Set clamping force is provided then the wedge ring 18. For further clarification of this device, you should contact the EP 343440.After mounting the centering device 8, 9 rolling ring 3 is firmly linked with the axis 2 of the roll. To facilitate dismantling of the inner support ring 5 includes several distributed around the circumference of hydroporinae 20, which through the channel 21 and the nipple 22 may be connected with a source of oil under pressure (not shown). If the nut 11 is loosened and the oil is directed to the piston 20, the rolling ring 3 together with the conical sleeve 9 can be slightly displaced in the direction of the free end of the axis, in achiev the Nut 11 includes at its free end side of the crown gear 23, the purpose of which is explained below. In the rolling mode cover 24 protects the free end side of the nut 11 and the axis 2 of the roll.To reduce played on the rolling stands installation work Fig.2 provides a device for pre-mounting of rolling rings 3, the outer support rings 10 and nuts 11. This device for pre-Assembly is formed by two mounted on the base 26 of the fingers 25, the shape of which corresponds to the 2 axes of the rolls, and their mutual geometric arrangement - arrangement of the axes of the 2 rolls. Mounted on rolling stands, the parts are first collected on the device for pre-Assembly, as shown in Fig.2. This device corresponds to the device in which the components during Assembly must be mounted on the roll axis. To transfer from the device for pre-Assembly on the roll axis serves as a replacement device, which simultaneously takes all the components on the device for pre-Assembly.This is the replacement device is best seen in subsequent figures. It includes a frame consisting of longitudinal 30 and 31 cross bars. It contains the coupling 32, which serves for connection with a manipulator, providing the internal supply of the replacement device to the rolling stands. Next frame contains the coupling 33, which allows you to connect the replacement device with the frame of the rolling mill stand so that withholding replacement device components are accurately aligned with the axes of the rolls, on which their bait. Provided by the device that provides the offset of the replacement device parallel to the direction of the axes of the 2 rolls and includes, for example, guide rods 34, each of which slides in the guide sleeve 35, strongly connected or associated with the frame rolling stands. Additionally, there may be a power drive (not shown), for example in the form of a cylinder-piston unit, which provides movement of the device along a predetermined bodies 34, 35 in the direction of doing. When setting up a replacement device on rolling stands held replacement device components are initially in the position in which they are distant from the axes of the rolls, however, aligned with them, and then due to the above movement of the replacement device coming on the roll axis. As a result, they are shown in Fig.3 at the left of the axis of the roll position in which the rolling ring 3 and the outer ring 10 are already approximately in the desired montagnat components, the replacement device is equipped with a boarding devices for the individual components. Boarding device for each rolling ring 3 and the outer support ring 10 is shown in Fig. 4. Longitudinal bars 30 depart down rigidly United with them brackets 38 on which the two gripper 39 on the guide rods 40 and driving the screw 41 mounted for movement in such a way that they are due to the rotation of the screw 41 may converge and diverge. After mounting the components on the fingers 25 of the device prior to installation of the replacement device to be moved along the device for pre-Assembly and rolling ring 3 and the outer ring 10 is clamped by the grippers 39 in the replacement device. They can therefore be removed replacement unit with a device for pre-Assembly and installed on rolling stands.Boarding device for a nut 11 is formed connected to the longitudinal bars 30 of the cross member 48 (Fig.4), mounted inside the replacement shaft 49 and placed on the threaded sleeve 50. The details are depicted in Fig.5.Replacement shaft 49 mounted in the bearing 51 of the sliding cross bar 48. Axially fixed it, on the one hand, the block 52 plate is the future of the shaft.On the lower free end of the closure shaft 49 threaded sleeve 50 is installed with the possibility of axial movement by a bearing 54 rolling. However, regarding the replacement of the shaft 49, it has no possibility of rotation as shaft extending from the pin 57 is in the longitudinal groove 58 of the threaded sleeve.Above the threaded sleeve 50 on a replacement shaft 49 is fixed to the plate 55. Spring-loaded pins 60 interact with the plate 55 and displace the threaded sleeve 50 in the direction of increasing distance from the plate 55. Under the threaded sleeve 50 replacement shaft 49 carries a plate 61. Addressed to her face surface of a threaded sleeve contains several distributed around the circumference of the bores (shown only one) that contains a spring-loaded pins 62. The last pressure plate 61 and displace the threaded sleeve 50 in the direction of increasing distance from the plate 61. If the threaded bushing 50 is not any other efforts, it occupies a middle position between the plates 55, 61, from which it may be axially displaced under the force of the springs in the direction of one or the other of the plates.Threaded sleeve 50 has on its outer circumference a thread 12A that is appropriate to the thread 12b nut 11. In Fig.5 and Fig.3 slew is and the replacement device to the axis of the roll. In order in the device for pre-Assembly nut 11 can be more easily connect with gonopodium device, the latter made with the possibility of separating from the frame of the replacement device. For this purpose loosen the wedge 53 and the axis of the roll is removed from the bearing 51 of the cross member 48. Threaded sleeve 50 can then be easily screwed in in the device for pre-Assembly nut 11, as shown in Fig.2 on the right. If both nuts in the device for pre-Assembly with corresponding ganapataye devices, the frame replacement unit can be placed on the device for pre-Assembly, connected to ganapataye devices and fixed wedge 53. After the capture of rolling rings grippers 39 replacement device that are held by it components can be removed from the device prior to installation.After connection of the replacement device with rolling stand first, as described above, the rolling ring 3 and the outer support ring 10 is put on the axis 2 of the roll. The lower end of each of the replacement shaft 49 is approaching the free end of the respective axis 2 of the roll. On the free end of the closure e of the centering recess 71. In the final position of the replacement device they are into each other and provide accurate alignment of the replacement shaft 49 with the axis 2 of the roll. To achieve this end position, even when there are dimensional tolerances between the rolling stand and the replacement device, provided by the spring 52. Its flexibility allows you to choose the final position of the replacement device so that, in any case, both the replacement shaft 49 rest against the ends of the respective axles 2 rolls, and this emphasis is recorded by the force of the spring 52.As soon as the replacement device reaches the end position, the nut 11 is necessary to Unscrew the threaded sleeve 50 and screw on the thread 13 of the axis of the roll. For this purpose (see Fig.4) into the guide bore 74 of the cross member 48 insert the shaft with the gear 73, and a guide hole 74 is so mounted on the free end of the shaft 73, the gear 75 is engaged with a ring gear 23 of the nut 11. To the rear end 76 of the shaft 73 can be summed up drive mechanism and the nut 11 at the expense of this can be seen during the rotation.When the forward end of the thread 12b reaches the beginning of the thread 13 of the axis of the roll, you cannot count on the fact that the thread will occupy the exact position. On the contrary, as the particular axial direction. The invention provides that the displacement due to the possibility of axial movement of the threaded sleeve 50 by replacing the shaft 49. So both threads can be mounted axially with respect to each other, and the nut 11 can be screwed on the threads 13 of the axis of the roll, and service personnel are not required to adhere to the precise mutual alignment of the turns of the threads.In Fig. 6 is illustrated a hit on each other turns of the threads. It depicts a scan of both coils of the threads in the relative position that they accidentally took in the moment of contact with each other of their ends 80, 81. The latter, as it is in most cases happens at the end of the thread, is limited on the outside going in the direction of the periphery of the surface 82 or 83, and on the reverse side is a normal side 84 of the thread profile. This run going in the direction of the periphery of the surfaces 82, 83 are almost always fall on each other. If we assume that depicted at the bottom of the thread axis of the roll is stationary, and the upper threaded nut is rotated in the drawing from right to left, movement of the upper thread is determined by the sliding surfaces 82, 83 on one another. This means that the upper thread can only rotate but cannot move in seewoo) of the end surface 86 82, the upper thread can fall between the lower threads and, thus, also to move axially.While the upper thread is rotated in the direction of the surfaces 82, 83 without axial component, it displaces the threaded bushing 50 on the size 87 up under the force of a spring-loaded pin 60. More than the height of the turns of the threads, cut 87 cannot be.I is shown in Fig.6 form of the threads of the threaded sleeve 50 is always displaced upwards. Provide spring-loaded pins 62 downward movement, therefore, is not required. However, it is advisable to provide spring-loaded pins 62 so that the replacement device can be used regardless of the type of threads.Fuse 57, 58 from the rotation of a threaded sleeve 50 relative to the replacement of the shaft 49 is provided in order to eliminate the rotation of the threaded sleeve by loosening the nut 11. Instead of preventing rotation of the threaded sleeve in some cases it is enough to provide for the locking of the rotation, for example by friction force that is greater than the torque exerted on the threaded sleeve by unscrewing the nuts.In the exemplary embodiment provides that the threaded sleeve may be axially is no periphery. For example, the threaded sleeve can be axially strongly connected with the replacement shaft and to have the possibility of deviation in the direction of the periphery under the spring force or friction force. If the nut in contact with each other turns of the threads is rotated without axial movement, as is explained with reference to Fig.5, the threaded sleeve can rotate together with it, overcoming the resistance of the spring or friction. As soon as it reached the rotational position of the nut where the thread is coming to the thread axis of the roll, the rotational movement of the threaded sleeve ends.The processes described above with reference to the mounting of components on the axes of the rolls are appropriately and to dismantle. In this first hydraulically strain annular piston 14, in order to weaken the ring 18. After reduction of the hydraulic pressure on the annular piston 14 is slightly weaken the nut 11. Then through the hydraulic loading of the cylinder-piston units 20 rolling ring 3 with the centering sleeve 9 is released from the clutch axis 2 of the roll. Can now be installed replacement device. Unscrew the ring nut 11 from the threaded segment 13 and screw on the threaded sleeve 50. Rolling ring 3 zahvatam the second time replacing the device with fresh components.It is clear that the described device is independent of the spatial position of the axes of the rolls. The replacement device is applicable to both vertical and horizontal axes. Used above, the terms "top" and "bottom" refer only to the position in the drawing.
Claims1. Device for replacing restraint rolling ring (3), nuts (11) on the console installed with the thread (13) of the nut (11) axis (2) of the roll by means of the replacement device, wherein the replacement device comprises a threaded sleeve (50), which is threaded (12A), coinciding with the thread (13) of the axis of the roll, and centering device (49) for coaxial mounting on axis (2) of the roll, while the threaded sleeve (50) is installed with the possibility of axial movement relative to the centering device (49) and/or axis (2) of the roll and secured against rotation.2. The device under item 1, characterized in that the centering device is formed by a bearing spacer (50) and tense by the end of the axis (2) roll replacement shaft (49).3. Device according to one of paragraphs.1 and 2, characterized in that the axial (87) move the threaded sleeve (50) is equal to at least wyson force of springs (60,62) to its original position, from which it may deviate under the force of springs, at least at the height of the threads (12A, 12b, 13).5. Device according to one of paragraphs.1-4, characterized in that the replacement device is designed to host multiple nuts (11) or rolling rings (3) the geometrical arrangement that is coincident with the geometric arrangement of multiple axes (2) rolls.6. The device under item 5, characterized in that there are several centring device (49) with the possibility of axial movement and axial tension by means of springs (52).7. Device according to one of paragraphs.1-6, characterized in that the replacement device comprises at least one retaining device (39) for rolling rings (3).8. The device according to p. 7, characterized in that a device (20) to loosen the clutch rolling ring (3) with the axis (2) of the roll.9. The device under item 8, characterized in that the device for loosening the clutch rolling ring (3) is formed by a cylinder-piston unit (20) mounted on facing away from the free end of the axis (2) of the roll side of the rolling ring (3).10. The device according to p. 9, characterized in that the cylinder-piston unit (20) is part of a ring (5) mounted between the rolling
FIELD: rolled stock production, possibly in skin pass cold rolling mills.
SUBSTANCE: backup roll includes barrel with central cylindrical portion and adjoined to it peripheral portions with cone chamfers further passing to cylindrical end portions. Cone portions has conicity degree from 1:500 to 1:100. Length of peripheral cylindrical portions consists 0.18 -0.4 of barrel length. Invention provides enhanced strength of micro-geometry of polished or notched surface of rolling rolls.
EFFECT: lowered number of operations for changing rolling rolls of mill, possibility for using waste backup rolls.
2 dwg, 2 tbl
FIELD: rolled stock production, namely configuration of rolls of rolling stands.
SUBSTANCE: in rolling stand having CVC-roll pair, mainly rolling CVC-rolls and pair of backup rolls with contact zone bcont, horizontal moment M causes roll drawing apart and provides occurring of axial efforts in bearing units of rolls. In order to provide minimum axial efforts in bearing units of rolls, moment M is lowered due to selecting profile of CVC-rolls determined by means of polynomial expression. In condition of optimized wedge shape of CVC-contour, the last is formed in such a way that tangent line to end portion diameter and to convex part of roll are mutually parallel and inclined relative to roll axes by optimal angle of wedge.
EFFECT: reduced values of moments acting upon bearing units of rolls in horizontal direction.
2 cl, 4 dwg
FIELD: rolled tube production, namely working tools of piercing mills of helical rolling mills, possibly manufacture of tubes in tube rolling aggregates, for example with pilger mills.
SUBSTANCE: roll of helical rolling mill includes (arranged in direction of piercing process) part for joining with drive unit, journal for bearing assembly, working portion with inlet and outlet cones, journal for bearing assembly and cantilever-type additional working portion. According to invention said cantilever-type additional working portion is detachable one; it is made in the form of ring joined through splined joints with rim of outlet side of roll with possibility of selecting diameter of ring depending upon piercing conditions such as lifting-charge and upon roll barrel wear degree. On inner side of wall of said ring there is thickened portion limiting shift towards inlet side of roll. Splined joints are inclined relative to roll axis by angle preventing ring motion towards outlet side of rotating roll.
EFFECT: enlarged functional possibilities of mill due to elimination of pierced sleeve curvature and their lowered wall thickness difference.
2 cl, 1 dwg
FIELD: rolling rolls for stands of continuous strip rolling mills.
SUBSTANCE: roll has curvilinear profile of generatrix of roll barrel and annular turnings along length of roll barrel. According to invention cylindrical surface of said turnings has profile equidistant relative to profile of roll barrel. Depth of turnings consists at least 0.25 of absolute reduction value in stand for predetermined deformation mode. Surface of roll has different micro-geometry along length of roll barrel. Height of micro-irregularities of cylindrical surface of turnings consists of 0.1 - 0.3 of micro-irregularity values of roll barrel surface.
EFFECT: enhanced efficiency of rolling mill, lowered metal consumption, improved stability of strip along roll barrel relative to rolling axis at discharging end portions of strips.
3 cl, 3 dwg, 1 tbl
FIELD: rolling mills with working rolls of different diameters.
SUBSTANCE: rolling mill for producing flat rolled strips with desired cross thickness difference includes rolling rolls of different diameters, at least one backup roll. Large-diameter rolling roll is joined with drive unit; small diameter rolling roll may rotate together with large-diameter roll as idle roll. Backup and rolling rolls are mounted in rolling stand with possibility of axial motion. At least one rolling roll is mounted with possibility of adjustment in direction of rolled strip outlet. Barrel profiles of backup and rolling rolls may have curvilinear CVC-contour defined by means of polynom at least of second order with displacement by 180°. Said CVC-contour has both contours of rolling roll barrels that complement each other to symmetrical contour of inter-roll gap. In order to compensate different type of bending and flattening, rolling rolls have different CVC-contours that are calculated with use of 5-order polynom, possibly 5-order polynom.
EFFECT: possibility for producing high-quality strips at universal usage of rolling stands.
8 cl, 2 dwg
FIELD: machine engineering, possibly rolling processes.
SUBSTANCE: roller type apparatus includes shaft of roller and at least one ring of roller clamped between two annular supports at least one of which may be removed. Changeable support includes detachable ring mounted on sleeve of shaft and having parts supported by means of locking compressed ring embracing said detachable ring. Locking ring may be subjected to preliminary compression load. Outer diameter of sleeve of shaft may be less than inner diameter of roller ring.
EFFECT: enhanced sensing of bending loads by means of such apparatus due to possibility for absorbing high torsion efforts.
4 cl, 6 dwg
FIELD: rolled tube production, namely calibration of rolls of pilger mills for rolling thick-wall large- and mean-diameter tubes, possibly in tube rolling aggregates with pilger mills.
SUBSTANCE: roll has along circle of its barrel round cross section groove with outlets. Length of said groove is determined by successively arranged: striker formed by radius of growing ridge of roll, polishing portion with constant or smoothly decreasing radius of roll ridge, lengthwise outlet angle and idle portion. Cross section of groove along length of polishing portion smoothly decreases by value ▵ not exceeding half of admissible error of tube diameter. Said value ▵ = (0.10-0.65)D/S where S - thickness of tube wall, mm; D - diameter of tube, mm; 0.10 - coefficient for tubes with relation D/S=15.0 and 0.65 - for tubes with relation D/S = 4.0 or less. If relation D/S is in range 15 - 10 cross section of groove along length of polishing portion decreases by value ▵1 = 0.5 - 1.0 mm; at relation D/S in range 10.0 - 6.0 ▵2 = 1.0 - 1.5 mm; at relation D/S equal to 6.0 or less ▵3 = 1.5 - 2.0 mm.
EFFECT: possibility for making boiler and thick-wall tubes with more narrow allowances along wall, elimination of tubes rejected by trimming, lowered metal consumption factor at conversion blank - thick-wall tube, reduced cost of such conversion.
2 cl, 1 tbl
FIELD: metallurgy; ferrous.
SUBSTANCE: said utility invention relates to equipment for the production of hot-rolled steel strip, namely, to the push stand of the continuous hot-strip mill. The push stand contains two rolls installed on supports in the frames, each of the cross sections of the roll bodies is designed with three round sections of equal length, divided with concave sections of equal length at the upper roll and convex sections of the same length at the lower roll, the convex section being equidistant to the concave sections of the upper roll, the vertexes of the concave sections facing to the roll axis, and the vertexes of the convex sections facing the opposite direction; the clearance between the rolls is constant along the whole length of the body generator, the roll convexity heights and concavity depths are equal and may be 0.08...0.10 of the radiuses of the circular roll body generator sections, and the length of all said sections is the same.
EFFECT: enhancement of hot-rolled strip quality, decrease in roll wear during hot rolling.
3 cl, 1 dwg, 1 ex
SUBSTANCE: roller is in preference operable for hot rolling contains barrel of diameter D with external hardened case of determined thickness and hardness and inner layer. Counteraction to roller rotation by means of external layer braking, leading to destruction of roller microstructure, is excluded at the expense of that between external and internal layer of barrel it is located interlayer made of heavy-duty steel, placed in barrel at casting of roller at distance (0.050...0.035) D from its surface; hardness of interlayer is 0.95...1.05 of external surface hardness of barrel, and it is made from corrugated sheet steel, involuted as cylinder, with corrugations, which are parallel to longitudinal axis of roller, and thickness of sheet steel can be (0.0085...0.0095) D at height of semicircular corrugations, equal to (0.035...0.040) D.
EFFECT: prolongation of working run of sheet mill rollers.
2 cl, 1 dwg, 1 ex