Blade wax pattern positioning device

Abstract

The embodiment of the application discloses a kind of blade wax mould positioning device, comprising: support frame includes first support frame and second support frame, first support frame is along the circumferential direction of rotating workbench, first support frame is movably connected between rotating workbench, second support frame is along the circumferential direction of mould group's ring gate arrangement;Positioning member is set on the second support frame, and the fitting part that is consistent with blade wax mould is set on the positioning member, and the positioning member is movably connected between second support frame.The blade wax mould positioning device provided in the application is positioned by the positioning member set on the second support frame, and the fitting part on the positioning member is consistent with blade wax mould, to ensure the verticality of blade wax mould, complete the positioning of blade wax mould, and the positioning member is movably connected with the second support frame, and the first support frame is movably connected between the rotating workbench, so that the blade wax mould positioning device can conveniently position multiple groups of blade wax mould, and the positioning precision of blade wax mould on mould group is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of precision casting of turbine blades of an aero-engine, and more particularly to a blade wax mold positioning device. BACKGROUND

[0002] In the directional solidification process of single crystal blades, the temperature field determines the qualification rate of the single crystal integrity of the blade castings, and the temperature field is mainly affected by the position and angle of the blade wax mold. Therefore, the accuracy of the angle and position of the blade wax mold on the mold set is particularly important, and it is difficult to accurately control the angle and position of each blade wax mold on the mold set when the blade wax mold is combined with the mold set manually. At the same time, the single crystal working blade requires that the deviation of the crystal orientation from the Z-axis of the blade should not exceed 15°, and when the height of the working blade exceeds 100 mm, the crystal orientation needs to be controlled manually during the combination of the wax mold, so that it is difficult to ensure the verticality, thereby causing the blade orientation to exceed the range value.

[0003] Therefore, how to improve the positioning accuracy of the blade wax mold on the mold set has become a technical problem to be solved by those skilled in the art. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a blade wax mold positioning device to improve the positioning accuracy of the blade wax mold on the mold set.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A blade wax mold positioning device comprises:

[0007] A support frame comprises a first support frame and a second support frame, the first support frame is arranged along the circumference of a rotating workbench and is movably connected between the first support frame and the rotating workbench, and the second support frame is arranged along the circumference of a ring gate of a mold set.

[0008] A positioning member is arranged on the second support frame, the positioning member is provided with a fitting part that fits the blade wax mold, so as to position the position of the blade wax mold on the mold set, and the positioning member is movably connected with the second support frame, so as to switch the positioning member between the positioning position and the avoiding position of the second support frame.

[0009] Optionally, in the above-mentioned blade wax mold positioning device, the second support frame is further provided with a centering block, the centering block is at least three, and each centering block is uniformly distributed on the second support frame, the end of the centering block faces the circumferential surface of the ring gate of the mold set, and all points to the center of the ring gate of the mold set, so as to center the mold set.

[0010] Optionally, in the blade wax mold positioning device, a first preset distance is left between the end of the centering block and the circumferential surface of the annular runner.

[0011] Optionally, in the blade wax mold positioning device, the first preset distance is 0.3mm-0.7mm.

[0012] Optionally, in the blade wax mold positioning device, the positioning member comprises a first positioning block and a second positioning block, the first positioning block is provided with a first fitting part which is fitted with the blade body of the blade wax mold, and the second positioning block is provided with a second fitting part which is fitted with the blade root of the blade wax mold.

[0013] Optionally, in the blade wax mold positioning device, the second positioning block is connected with the second support frame through a mounting seat, and the mounting seat is provided with a first support rod, and the first positioning block is connected with the first support rod.

[0014] Optionally, in the blade wax mold positioning device, the first support rod comprises a movable rod and a connecting rod, the connecting rod is used for connecting the first positioning block and the mounting seat, and the mounting seat is provided with a movable assembly so that the positioning member rotates around the movable rod.

[0015] Optionally, in the blade wax mold positioning device, the movable assembly comprises an arc-shaped sliding groove opened in the mounting seat and a first fastener, the first fastener is matched with the arc-shaped sliding groove to lock the positioning member.

[0016] Optionally, in the blade wax mold positioning device, the first support frame and the second support frame are connected through a second support rod.

[0017] Optionally, in the blade wax mold positioning device, the first support frame is provided with a movable clamping member and a fixed clamping member, the movable clamping member is provided with a second fastener, the second fastener is used for locking the connection between the first support frame and the rotary workbench, and the fixed clamping member protrudes from the first support frame and abuts against the rotary workbench.

[0018] The blade wax mold positioning device provided by the application comprises a first support frame and a second support frame, the first support frame is located below the second support frame, the first support frame is arranged along the circumference of a rotating workbench and is movably connected with the rotating workbench, so that the rotating workbench can rotate, the second support frame is arranged along the circumference of a ring gate of a mold set, a positioning piece is arranged on the second support frame, a fitting part that is fitted with the blade wax mold is arranged on the positioning piece, and the positioning piece is movably connected with the second support frame, so that the positioning piece can be switched between a positioning position and a avoiding position of the second support frame. When the blade wax mold is placed on the mold set, the positioning piece is switched to the positioning position of the second support frame, at this time, the blade wax mold is fitted with the fitting part on the positioning piece, so that the verticality of the blade wax mold is ensured, and the positioning of the blade wax mold is completed; when a second group of blade wax molds need to be positioned, the positioning piece is switched to the avoiding position of the second support frame, the rotating workbench is rotated, and then the second group of blade wax molds are placed on the mold set and positioned.

[0019] Compared with the prior art, the blade wax mold positioning device provided by the application positions the blade wax mold through the positioning piece arranged on the second support frame, and the blade wax mold is fitted with the fitting part on the positioning piece, so that the verticality of the blade wax mold is ensured, and the positioning of the blade wax mold is completed; the positioning piece is movably connected with the second support frame, and the first support frame is movably connected with the rotating workbench, so that the blade wax mold positioning device can conveniently position multiple groups of blade wax molds, and the positioning precision of the blade wax mold on the mold set is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0021] Figure 1 The structure schematic view of the blade wax mold positioning device provided by the embodiment of the present application is shown in the figure.

[0022] Figure 2 The local schematic view of the first support frame provided by the embodiment of the present application is shown in the figure.

[0023] Figure 3 The structure schematic view of the blade wax mold positioning device and the mold set provided by the embodiment of the present application is shown in the figure.

[0024] Figure 4 The schematic view of the blade wax mold positioning device provided by the embodiment of the present application in the first working condition is shown in the figure. Figure 1 ;

[0025] Figure 5 The schematic view of the blade wax mold positioning device provided by the embodiment of the present application in the first working condition Figure 2 ;

[0026] Figure 6 The schematic view of the blade wax mold positioning device provided by the embodiment of the present application in the second working condition

[0027] Figure 7 The schematic view of the blade wax mold positioning device provided by the embodiment of the present application in the third working condition

[0028] Figure 8 The partial schematic view of the second support frame provided by the embodiment of the present application.

[0029] Wherein, 100 is the first support frame, 101 is the dynamic clamping piece, 1011 is the second fastener, 102 is the fixed clamping piece, 103 is the second support frame, 104 is the centering block, 105 is the mounting seat, 1051 is the fixed part, 1052 is the movable part, 1053 is the first fastener, 1054 is the arc-shaped sliding groove, 106 is the first supporting rod, 1061 is the movable rod, 1062 is the connecting rod, 107 is the first positioning block, 1071 is the first fitting part, 1072 is the connecting part, 1073 is the mounting block, 108 is the second positioning block, 1081 is the second fitting part, 109 is the second supporting rod, 200 is the mold group, and 300 is the blade wax mold. DETAILED DESCRIPTION

[0030] The core of the present application is to provide a blade wax mold positioning device to improve the positioning accuracy of the blade wax mold on the mold group.

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] As Figure 1As shown, the embodiment of the present application discloses a blade wax mold positioning device, comprising a support frame and a positioning piece. It should be noted that when the artificial combination blade wax mold 300 and the mold group 200, it is difficult to accurately control the angle and position of each blade wax mold 300 on the mold group 200, thereby affecting the qualification rate of the single crystal integrity of the blade casting. The blade wax mold 300 positioning device disclosed by the embodiment of the present application is provided with a fitting part on the positioning piece of the second support frame 103, which is fitted with the blade wax mold 300, so as to ensure the verticality of the blade wax mold 300. When the blade wax mold 300 deviates, the fitting part on the positioning piece cannot be completely fitted with the blade wax mold 300, and the verticality of the blade wax mold 300 can be ensured by adjusting the blade wax mold 300 to completely fit with the fitting part on the positioning piece. At the same time, after positioning a group of blade wax molds 300, the rotating workbench can be rotated to position the second group of blade wax molds 300, thereby improving the positioning accuracy of the blade wax mold 300 on the mold group 200.

[0033] As shown, Figure 3 The support frame comprises two, in order to facilitate understanding, the two support frames are defined as the first support frame 100 and the second support frame 103. Among them, the first support frame 100 is located below the second support frame 103, the first support frame 100 is arranged along the circumference of the rotating workbench, specifically, the first support frame 100 is a semicircular disc structure, which is arranged on the outside of the circumferential surface of the rotating workbench, the first support frame 100 is movably connected with the rotating workbench, and there is a gap between the first support frame 100 and the outside of the circumferential surface of the rotating workbench, so that the rotating workbench can rotate, the second support frame 103 is arranged along the circumference of the annular runner of the mold group 200, the second support frame 103 is a semicircular disc structure, which is arranged on the outside of the circumferential surface of the annular runner of the mold group 200, so as to position the blade wax mold 300 on the positioning piece arranged on the second support frame 103.

[0034] Further, as shown in Figure 4 and Figure 5 The positioning piece is arranged on the second support frame 103, and the fitting part fitted with the blade wax mold 300 is arranged on the positioning piece, so as to position the blade wax mold 300 on the mold group 200, and the positioning piece is movably connected with the second support frame 103, so as to switch the positioning piece between the positioning position of the second support frame 103 and the avoiding position. When the positioning piece positions the blade wax mold 300, the positioning piece is turned to the positioning position of the second support frame 103, so that the blade wax mold 300 is fitted with the fitting part on the positioning piece, thereby completing the positioning of the first group of blade wax molds 300, when the second group of blade wax molds 300 needs to be positioned, the positioning piece is turned to the avoiding position of the second support frame 103, as Figure 6Prevent the positioning member from blocking the blade wax mold 300, at this time, rotate the rotary workbench, and place the second set of blade wax molds 300 on the mold group 200, and then position the second set of blade wax molds 300, as shown in Figure 7 .

[0035] Further, as shown in Figure 3 , in a specific embodiment, the first support frame 100 is provided with a movable clamping member 101 and a fixed clamping member 102, and the fixed clamping member 102 is two, and is arranged at the positions of 10° and 170° of the first support frame 100, and extends out of the first support frame 100 and abuts against the rotary workbench, and the movable clamping member 101 is provided with a second fastener 1011, as shown in Figure 2 When the rotary workbench abuts against the fixed clamping member 102 and rotates to the corresponding position, the second fastener 1011 on the movable clamping member 101 is locked to prevent the rotary workbench from rotating. As shown in Figure 8 , the second support frame 103 is engraved with an explanatory sign for reminding the user, wherein the explanatory sign is the corresponding relationship between the number of sets of blade wax molds 300 and the positions of the blade wax molds 300 on the mold group 200, so that the user can position the plurality of sets of blade wax molds 300 according to the explanatory sign, and the first support frame 100 and the second support frame 103 are connected through the second support rod 109. In this embodiment, as shown in Figure 4 and Figure 5 When the first set of blade wax molds 300 is positioned, the 0° scale line on the rotary workbench is aligned with the movable clamping member 101, the second fastener 1011 is locked to lock the connection between the first support frame 100 and the rotary workbench, and the rotary workbench is prevented from rotating, and at the same time, the first set of blade wax molds 300 is placed on the mold group 200, and the positioning member is turned from the circumferential direction of the second support frame 103 to the radial direction of the second support frame 103, at this time, the first set of blade wax molds 300 is attached to the attachment part of the positioning member to ensure the verticality of the blade wax mold 300, thereby completing the positioning of the first set of blade wax molds 300; as shown in Figure 6 and Figure 7When the second set of blade wax molds 300 is positioned, the positioning member is turned to the circumferential direction of the second support frame 103 to prevent the positioning member from blocking the passage of the blade wax molds 300, at this time, the rotary workbench is rotated, and the second set of blade wax molds 300 is placed on the mold group 200, and then the second set of blade wax molds 300 is positioned. In the embodiment, only the positioning of the two sets of blade wax molds 300 is explained and described, and the positioning of the blade wax molds 300 of other sets is similar to the specific embodiment in the embodiment, and details are not repeated here. It should be noted that the positioning member is turned from the circumferential direction of the second support frame 103 to the radial direction of the second support frame 103, that is, the positioning member is turned from the avoiding position to the positioning position. When the positioning member is turned from the circumferential direction of the second support frame 103, that is, the avoiding position, to the radial direction of the second support frame 103, that is, the positioning position, at this time, the first set of blade wax molds 300 is attached to the attachment part of the positioning member, thereby completing the positioning of the first set of blade wax molds 300; when the second set of blade wax molds 300 is positioned, the positioning member is turned to the circumferential direction of the second support frame 103, that is, the avoiding position, to prevent the positioning member from blocking the passage of the blade wax molds 300, at this time, the rotary workbench is rotated, and the second set of blade wax molds 300 is placed on the mold group 200, and then the second set of blade wax molds 300 is positioned. The circumferential direction of the second support frame 103 is a direction tangent to the second support frame 103, and the radial direction is a direction pointing to the center of the mold group 200.

[0036] The blade wax mold positioning device provided by the application comprises a first support frame 100 and a second support frame 103, the first support frame 100 is located below the second support frame 103, the first support frame 100 is arranged along the circumferential direction of the rotary workbench and movably connected with the rotary workbench, so that the rotary workbench can rotate, the second support frame 103 is arranged along the circumferential direction of the annular runner of the mold group 200, a positioning member is arranged on the second support frame 103, the positioning member is movably connected with the second support frame 103, and an attachment part attached with the blade wax mold 300 is arranged on the positioning member. When the blade wax mold 300 is placed on the mold group 200, the positioning member is turned to the positioning position of the second support frame 103, at this time, the blade wax mold 300 is attached to the attachment part of the positioning member, thereby ensuring the verticality of the blade wax mold 300, so as to complete the positioning of the blade wax mold 300. When the second set of blade wax molds 300 needs to be positioned, the positioning member is turned to the avoiding position of the second support frame 103, the rotary workbench is rotated, and the second set of blade wax molds 300 is placed on the mold group 200, and then the second set of blade wax molds 300 is positioned.

[0037] Compared with the prior art, the blade wax mold positioning device provided by the application positions the blade wax mold 300 through the positioning piece arranged on the second support frame 103, simultaneously makes the blade wax mold 300 fit the fitting part on the positioning piece, so as to ensure the verticality of the blade wax mold 300, thereby completing the positioning of the blade wax mold 300. The positioning piece is movably connected with the second support frame 103, and the first support frame 100 is movably connected with the rotating workbench, so that the blade wax mold 300 positioning device can conveniently position multiple groups of blade wax molds 300, thereby improving the positioning precision of the blade wax mold 300 on the mold set 200.

[0038] Further, as shown in Figure 1 and Figure 3 in a specific embodiment, the second support frame 103 is further provided with centering blocks 104. The centering blocks 104 are at least three, and each of the centering blocks 104 is uniformly distributed on the second support frame 103. The end of the centering block 104 faces the circumferential surface of the annular runner of the mold set 200, and all points to the center of the annular runner of the mold set 200, and is used for centering the mold set 200. The first preset distance is left between the end of the centering block 104 and the circumferential surface of the annular runner, and the first preset distance is 0.3mm-0.7mm. In this embodiment, three centering blocks 104 are adopted, and the first preset distance is 0.5mm, so as to ensure that the mold set 200 can rotate. When the mold set 200 is placed on the rotating workbench, the end of the three centering blocks 104 faces the circumferential surface of the annular runner of the mold set 200, and points to the center of the annular runner of the mold set 200, and ensures that the end of the centering block 104 and the circumferential surface of the annular runner leave a gap of 0.5mm, thereby completing the centering of the annular runner of the mold set 200 by the centering block 104. Of course, the centering block 104 can also be four, five, etc. Those skilled in the art can understand that the more the number of centering blocks 104 is, the higher the centering precision is, and the higher the material cost is. The less the number of centering blocks 104 is, the lower the centering precision is, and the lower the material cost is.

[0039] Further, as shown in Figure 1As shown, in a specific embodiment, the positioning member comprises a first positioning block 107 and a second positioning block 108. The first positioning block 107 is provided with a first fitting part 1071 which is fitted with the blade body of the blade wax mold 300. The first positioning block 107 has a connecting part 1072, and a mounting block 1073 is arranged on the connecting part 1072. The mounting block 1073 is rotatable relative to the connecting part 1072. The second positioning block 108 is provided with a second fitting part 1081 which is fitted with the blade root of the blade wax mold 300. The second positioning block 108 is connected with the second support frame 103 through a mounting seat 105. The mounting seat 105 is provided with a first support rod 106. The first positioning block 107 is connected with the first support rod 106 through an extension part of the first positioning block 107. The first support rod 106 comprises a movable rod 1061 and a connecting rod 1062. The movable rod 1061 is rotatable. The connecting rod 1062 is used to connect the first positioning block 107 and the mounting seat 105, so that the first positioning block 107 can be rotated together with the second positioning block 108. The mounting seat 105 is provided with a movable assembly, so that the positioning member can be rotated around the movable rod 1061. Specifically, the mounting seat 105 comprises a movable part 1052 and a fixed part 1051. The fixed part 1051 is connected with the second support frame 103 through bolts. The movable part 1052 is movably arranged on the fixed part 1051. The second positioning block 108 is connected with the movable part 1052. The movable rod 1061 is connected between the movable part 1052 of the mounting seat 105 and the connecting part 1072 of the first positioning block 107. The connecting rod 1062 comprises two connecting rods, which are defined as a first connecting rod 1062 and a second connecting rod 1062. The first connecting rod 1062 is connected between the movable part 1052 of the mounting seat 105 and the connecting part 1072 of the first positioning block 107. The second connecting rod 1062 is connected between the fixed part 1051 of the mounting seat 105 and the mounting block 1073 on the connecting part 1072 of the first positioning block 107. In this way, when the first positioning block 107 and the second positioning block 108 are rotated, the mounting block 1073 on the connecting part 1072 does not rotate, so that the first positioning block 107 can be rotated together with the second positioning block 108. In addition, the connection strength between the first positioning block 107 and the second positioning block 108 is improved.

[0040] Further, as Figure 1 and Figure 8As shown, the movable assembly is arranged on the movable part 1052 of the mounting base 105, wherein the movable assembly comprises an arc-shaped sliding groove 1054 arranged on the mounting base 105 and a first fastener 1053, the arc-shaped sliding groove 1054 is arranged on the movable part 1052 of the mounting base 105, and the first fastener 1053 is matched with the arc-shaped sliding groove 1054 to lock the positioning member. When the first group of blade wax molds 300 is positioned, the 0° scale line on the rotating workbench is aligned with the movable clamp 101 of the first support frame 100, and then the second fastener 1011 is locked to lock the connection between the first support frame 100 and the rotating workbench, as shown in Figure 3 As shown, at the same time, the first group of blade wax molds 300 is placed on the mold group 200, at this time, the first fastener 1053 is loosened, the movable part 1052 of the mounting base 105 is rotated by 90°, so that the positioning member is turned to the positioning position of the second support frame 103, and the first fastener 1053 is locked, the first abutting part 1071 of the first positioning block 107 on the positioning member is abutted with the blade body of the blade wax mold 300, and the second abutting part 1081 of the second positioning block 108 on the positioning member is abutted with the blade root of the blade wax mold 300, so as to ensure the verticality of the first group of blade wax molds 300, thereby completing the positioning of the first group of blade wax molds 300, as shown in Figure 4 and Figure 5 As shown, when the second group of blade wax molds 300 is positioned, the first fastener 1053 is loosened, the movable part 1052 of the mounting base 105 is rotated by 90°, so that the positioning member is turned to the avoiding position of the second support frame 103, as shown in Figure 6 As shown, to prevent the positioning member from blocking the blade wax mold 300, the rotating workbench is rotated at this time, and the second group of blade wax molds 300 is placed on the mold group 200, and then the second group of blade wax molds 300 is positioned, as shown in Figure 7 It should be noted that the positioning member and the second support frame 103 are detachably connected, so as to be suitable for different blade wax mold 300 toolings.

[0041] The terms "first" and "second" and the like in the description and claims of the present application and the above drawings are used to distinguish different objects, and are not used to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can include steps or units not listed.

[0042] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A blade wax pattern positioning device, characterized in that, The utility model relates to a kind of blade wax mould positioning device, including: Support frame, support frame includes first support frame (100) and second support frame (103), the first support frame (100) is arranged along the circumferential direction of rotating workbench, and the first support frame (100) is movably connected between the rotating workbench, the second support frame (103) is arranged along the circumferential direction of ring gate of module (200); Positioning member is arranged on second support frame (103), the positioning member is provided with the abutting portion that is consistent with blade wax mould (300), so as to position the position of blade wax mould (300) on module (200), and the positioning member is movably connected between the second support frame (103), to make the positioning member switch between the positioning position and the avoiding position of the second support frame (103); The positioning member includes first positioning block (107) and second positioning block (108), the first positioning block (107) is provided with the first abutting portion (1071) that is consistent with the blade body of blade wax mould (300), and the second positioning block (108) is provided with the second abutting portion (1081) that is consistent with the blade root of blade wax mould (300); The second positioning block (108) is connected with the second support frame (103) by mounting seat (105), and the mounting seat (105) is provided with first support rod (106), and the first positioning block (107) is connected on the first support rod (106); The first support rod (106) includes movable rod (1061) and connecting rod (1062), and the connecting rod (1062) is used for connecting the first positioning block (107) and the mounting seat (105), and the mounting seat (105) is provided with movable assembly, so that the positioning member rotates around the movable rod (1061); The movable assembly includes arc-shaped sliding slot (1054) and first fastener (1053) opened in the mounting seat (105), and the first fastener (1053) cooperates with the arc-shaped sliding slot (1054) to lock the positioning member.

2. The blade wax pattern positioning device of claim 1, wherein, The second support frame (103) is also provided with centering block (104), the centering block (104) is at least three, and each centering block (104) is evenly distributed on the second support frame (103), and the end of the centering block (104) is towards the circumferential surface of the ring gate of module (200), and all points to the center of the ring gate of module (200), for centering module (200).

3. A blade wax pattern positioning device according to claim 2, wherein, The end of the centering block (104) and the circumferential surface of the ring gate leave first preset distance.

4. A blade wax pattern positioning device according to claim 3, wherein, The first preset distance is 0.3mm-0.7mm.

5. The blade wax pattern positioning device of claim 1, wherein, The first support frame (100) and the second support frame (103) are connected by second support rod (109).

6. The blade wax pattern positioning device of claim 1, wherein, The first support frame (100) is provided with a movable clamping piece (101) and a fixed clamping piece (102), the movable clamping piece (101) is provided with a second fastener (1011), the second fastener (1011) is used for locking the connection of the first support frame (100) and the rotary workbench, and the fixed clamping piece (102) extends out of the first support frame (100) and abuts against the rotary workbench.

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