Flanging die and forming equipment

Abstract

The utility model relates to the technical field of flanging machining, and provides a flanging die and a forming device.The flanging die comprises a first die base and a second die base, the first die base comprises a flanging assembly, and the flanging assembly is provided with at least one convex-concave component; the convex-concave component comprises at least two protruding parts distributed at intervals and a concave part located between every two adjacent protruding parts. And when the flanging assembly gets close to the second die holder, at least one convex-concave component is used for being in contact with a flanging process piece located between the first die holder and the second die holder in sequence through the convex part and the concave part. According to the flanging die, the defect that cracking is prone to occurring in the flanging process can be overcome through the convex-concave component, and the machining yield of the flanging process is increased.

Description

Technical Field

[0001] The present application belongs to the field of flanging processing, and more specifically, relates to a flanging mold and forming equipment. Background Art

[0002] In the flanging forming process, especially taking vehicle stamping parts as an example, they have the characteristics of complex shape and thin material, and their flanging forming is difficult and there is a problem of easy cracking.

[0003] Taking the vehicle side as an example, please refer to Figure 1 As the largest and most complex component, with the most mating surfaces for the opening and closing parts, the side panels, near the side panel water trough and the upper end of the tailgate, require flanging during the stamping process. Due to its location, this area suffers from numerous weld points, varying flanging heights, and other issues, making flanging difficult and resulting in a low yield.

[0004] In order to overcome the above problems and improve the processing yield of the side panel, it is necessary to develop a new type of flanging mold and a molding equipment with the same. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a flanging mold and forming equipment to improve the technical problem of low processing yield of the flanging process in the related art.

[0006] To achieve the above objectives, the technical solution adopted in this application is:

[0007] In the first aspect, the present application provides a flanging mold, comprising a first mold base and a second mold base, the first mold base comprising a flanging assembly, the flanging assembly being provided with at least one convex-concave component, the convex-concave component comprising at least two spaced-apart raised portions and a recessed portion located between two adjacent raised portions; when the flanging assembly approaches the second mold base, at least one of the convex-concave components is used to contact the flanging process parts located between the first mold base and the second mold base in sequence through the raised portion and the recessed portion.

[0008] Optionally, the number of the convex-concave components is at least two, and at least two of the convex-concave components are spaced apart along the surface of the flanging assembly facing the second mold base.

[0009] Optionally, in at least one of the convex-concave components, the number of the concave portion is one.

[0010] Optionally, any one of the convex-concave members includes two convex portions.

[0011] Optionally, adjacent protrusions and depressions are smoothly transitioned through curved surfaces.

[0012] Optionally, a surface of any one of the protrusion and the recessed portion that contacts the flanging workpiece is a curved surface.

[0013] Optionally, the flanging process part has a material contact compensation area, and the protrusion and the recess are arranged opposite to the material contact compensation area.

[0014] Optionally, the flanging process part has a flanging parting line, and the material contact compensation area is located on a side of the flanging parting line that is away from the middle of the flanging process part.

[0015] Optionally, at least part of the circumferential side edge of the flanging process part in the first direction is an arc-shaped non-equal height edge, and the flanging parting line is arranged adjacent to the arc-shaped non-equal height edge.

[0016] Optionally, the projection contour of the arc-shaped non-equal-height edge in the first direction is a gentle curve, and the curvature range of the gentle curve is 0 to 0.5.

[0017] Optionally, the flanging assembly has a flanging contact surface on a side facing the second mold base, and the protrusion protrudes relative to the flanging contact surface along the first direction.

[0018] Optionally, the recessed portion is recessed relative to the flange contact surface along the first direction.

[0019] Optionally, the first die base further includes a die body, and the flanging assembly is provided on a side of the die body facing the second die base;

[0020] The second die base includes a male die body for cooperating with the female die body.

[0021] In a second aspect, the present application provides a molding device, characterized in that it includes any of the flanging molds described above.

[0022] Compared with the prior art, this application has at least the following beneficial effects:

[0023] In the flanging mold provided in the embodiment of the present application, the convex-concave components with raised portions and recessed portions are arranged on the flanging assembly of the first mold base. The raised portions and recessed portions arranged in sequence can change the direction and contact sequence of the flanging parts in the corresponding flanging process parts, wherein the area opposite to the recessed portion can provide certain compensation for the flanging process by delaying the flanging, thereby reducing the probability of flanging cracking and improving the yield rate of the flanging processing.

[0024] The forming apparatus provided in the embodiments of the present application includes the aforementioned flanging dies. Therefore, the beneficial effects of including any one or more of the aforementioned flanging dies in the forming apparatus are not further elaborated herein. Furthermore, when the forming apparatus including the flanging dies is used to process corresponding parts, it can help improve the forming limit of the flanging sheet material, facilitate further thinning of the flanging sheet material, and achieve lightweight processing of the related parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 It is a structural schematic diagram of the side workpiece;

[0027] Figure 2 A schematic structural diagram of a flanging die provided in an embodiment of the present application;

[0028] Figure 3 A schematic diagram of the coordination between the flanging die and the flanging process parts provided in an embodiment of the present application;

[0029] Figure 4 for Figure 3 Schematic diagram of the arc-shaped non-uniform edge processing of the flanging process part.

[0030] Among them, the reference numerals in the figures are:

[0031] 10. First die base; 11. Flanging assembly; 1101. Flanging contact surface; 110. Concave and convex component; 111. Protrusion; 112. Concave portion; 12. Die body; 20. Second die base; 21. Punch body; 30. Flanging process part; 31. Material contact compensation area; 32. Flanging parting line; 33. Arc-shaped non-equal height edge. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0033] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0036] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0038] In this application, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0039] In order to solve or to a certain extent improve the problem of low flanging yield caused by cracking of parts during flanging processing, and to improve the flanging yield, in the first aspect, an embodiment of the present application provides a flanging mold, which can provide certain compensation for the flanging area by adjusting the direction and flanging order of different areas of the workpiece to be flanging, so as to achieve the effect of reducing the probability of flanging cracking and improving the flanging yield.

[0040] See also Figure 2-Figure 3 The flanging mold provided in the embodiment of the present application includes a first mold base 10 and a second mold base 20. The first mold base 10 includes a flanging assembly 11. The flanging assembly 11 is provided with at least one convex-concave component 110. The convex-concave component 110 includes at least two spaced-apart raised portions 111 and a recessed portion 112 located between two adjacent raised portions 111. When the flanging assembly 11 on the first mold base 10 and the second mold base 20 approach each other, at least one convex-concave component 110 is used to contact the flanging process part 30 located between the first mold base 10 and the second mold base 20 in sequence through the raised portion 111 and the recessed portion 112.

[0041] When the flanging mold is applied to the flanging processing of the flanging process part 30, the convex-concave component 110 provided on the flanging component 11 and having the convex portion 111 and the concave portion 112 arranged in sequence can be used to optimize the flanging direction and contact sequence of the flanging process part 30 during the flanging processing, thereby improving the process defects such as cracking during the flanging processing and helping to improve its processing yield.

[0042] Before the corresponding parts are subjected to flanging processing, they need to undergo a drawing process and a trimming process in sequence to obtain the above-mentioned flanging process part 30.

[0043] Specifically, the blank or semi-finished part to be processed can be processed into a drawing process part after a certain process, and the drawing process part can be processed into a trimming process part after the drawing process. The trimming process part can be processed into the flanging process part 30 after the trimming process.

[0044] This flanging die is suitable for flanging of aluminum plates.

[0045] It should be noted that the flanging die provided in this embodiment can be applied not only to parts with relatively flat flanging edges, such as parts with equal height flanging edges, but also to parts with non-equal height flanging edges, such as Figure 1 Processing of the side workpiece shown.

[0046] The side panel workpiece has an arc-shaped non-uniform flange. This embodiment takes the side panel workpiece as an example to specifically illustrate the structure of the flange mold.

[0047] See also Figure 2-Figure 3 , Figure 2 The arrow in is used to indicate the first direction X.

[0048] When the first die base 10 approaches the second die base 20 until the flanging assembly 11 contacts the flanging process part 30, the raised portion 111 of the convex-concave member 110 on the flanging assembly 11 contacts part of the surface of the flanging process part 30. As the first die base 10 and the second die base 20 continue to approach each other, the raised portion 111 squeezes the corresponding area of ​​the flanging process part 30 and causes it to be flanging. At this time, the raised portion 111 plays the role of flanging the material first. Correspondingly, the recessed portion 112 plays the role of storing material and delaying contact with the material. After the area corresponding to the raised portion 111 is folded a certain angle, the recessed portion 112 contacts the corresponding area and performs flanging. After the flanging assembly 11 moves to the set path end point, the flanging process part 30 is now flanging in place, and the flanging process is complete.

[0049] During the flanging process, the convex portion 111 and the concave portion 112, which are located in the same convex-concave component 110 and arranged adjacently, can successively contact the flanging area, and during the flanging process, the flanging area first moves toward the area corresponding to the concave portion 112, and then gradually transitions to flanging. This flanging method can adjust the routing of the flanging area and the contact sequence between different positions of the flanging area and the flanging assembly 11, wherein the position opposite to the convex portion 111 is flipped first, and the area opposite to the concave portion 112 is flipped later. At this time, the flanging area corresponding to the concave portion 112 can provide a certain amount of material storage compensation to the areas on both sides of it that are opposite to the convex portion 111 before contacting the concave portion 112, thereby reducing the probability of flanging cracking in the flanging area.

[0050] During the flanging process, the first die holder 10 may be arranged above the second die holder 20 . In this case, the first direction X may be the direction of the vertical line or a direction substantially consistent with the direction of the vertical line.

[0051] Specifically, the flanging process part 30 is placed on the second mold base 20. The second mold base 20 can be fixed and the first mold base 10 can be moved downward to act on the flanging process part 30; or, the first mold base 10 can be fixed and the second mold base 20 can be moved upward to act on the flanging process part 30.

[0052] A certain amount of clearance space is provided on the second mold base 20, which is used to make way for the raised portion 111 and the recessed portion 112 on the first mold base 10, so as to ensure that during the flanging process of the flanging process part 30, the flanging area of ​​the flanging process part 30 can be folded toward the clearance space as the flanging assembly 11 moves and form a flanging structure.

[0053] In some embodiments, see Figure 3 The flanging process part 30 has a material contact compensation area 31 , and the protrusion 111 and the recessed portion 112 are arranged opposite to the material contact compensation area 31 .

[0054] That is, the material contact compensation area 31 is provided in the flanging area of ​​the flanging process part 30 and can form a flanging after the flanging process is completed.

[0055] It should be noted that the surface of the material compensation area 31 is a smooth plane. Before and after the flanging operation on the flanging workpiece 30, the surface of the material compensation area 31 remains relatively smooth. The surface of the material compensation area 31 only becomes concave and convex during the flanging process.

[0056] In order to further clearly define the range of the material contact compensation area 31, in some embodiments, the flanging process part 30 is further provided with a flanging parting line 32. The material contact compensation area 31 is located on the side of the flanging parting line 32 facing away from the middle of the flanging process part 30.

[0057] That is, the material contact compensation area 31 is located outside the flange parting line 32 .

[0058] The flanging parting line 32 is used as a dividing line to distinguish the first mold base 10 from the second mold base 20. During the flanging process, the first mold base 10 and the second mold base 20 can contact the flanging process part 30 through the flanging parting line 32 and perform flanging processing on it.

[0059] The flange parting line 32 is used to determine the flange shape, and its position and shape determine the final shape of the flange. The flange process part 30 can be defined as comprising a main body and a flange, wherein the main body and the flange can be separated by the flange parting line 32.

[0060] The shape of the flanging parting line 32 can be adaptively adjusted according to the processing requirements of the flanging process part 30 .

[0061] In some embodiments, at least a portion of the circumferential side edge of the flanging component 30 in the first direction X is an arc-shaped non-equal-height edge 33 , and the flanging parting line 32 is disposed adjacent to the arc-shaped non-equal-height edge 33 .

[0062] When the flanging component 30 is positioned above the second mold base 20, the first direction X refers to the thickness direction of the flanging component 30. That is, along the thickness direction of the flanging component 30, at least a portion of its outer periphery is a curved, non-contoured edge 33. The flanging parting line 32 is positioned adjacent to this curved, non-contoured edge 33. Accordingly, the material contact compensation area 31 is located between the flanging parting line 32 and the curved, non-contoured edge 33.

[0063] See also Figure 1 and Figure 4 Taking the side panel workpiece as an example, the side panel workpiece is obtained by flanging the arc-shaped non-uniform edge 33 on the circumferential side edge of the flanging process part 30 and its surrounding area.

[0064] In some embodiments, the projection profile of the arc-shaped non-uniform edge 33 on the flanging workpiece 30 in the first direction X is a gentle curve, and the curvature range of the gentle curve is 0-0.5.

[0065] exist Figure 4 In the figure, the marked curve is the arc-shaped non-equal-height edge 33 whose projection contour is a gentle curve, and the unmarked intersecting dotted curve is the arc-shaped non-equal-height edge 33 whose projection contour is a non-gentle curve.

[0066] By comparison, it can be seen that the arc-shaped non-equal-height edge 33 whose projection profile is a gentle curve is smoother, and the height difference at each position of the edge is smaller.

[0067] If the height difference of the curved non-uniform edge 33 of the flanging component 30 is large, uneven material pulling can occur during the flanging process, leading to tearing and a higher likelihood of cracking in the flanging component 30. By adjusting the projection of the curved non-uniform edge 33 in the first direction X to a gentle curve, the likelihood of cracking in the flanging component 30 during the flanging process can be reduced.

[0068] Specifically, the curvature range of the above-mentioned gentle curve can be 0 to 0.5, and its actual curvature can be adaptively adjusted within this range according to processing requirements. For example, the curvature of the gentle curve at different positions can be at least one of 0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45 and 0.5.

[0069] In the process of preparing the above-mentioned side panel workpiece by flanging, the number of the protrusions 111 and the recessed portions 112 on the flanging assembly 11 can also be adjusted according to the size of the flanging portion.

[0070] Referring to Figure 3 In some embodiments, the convex-concave members 110 are arranged in a "W" shape, with two convex portions 111 and one concave portion 112.

[0071] Alternatively, the convex-concave members 110 can each include two convex portions 111, and all the convex-concave members 110 are arranged in a "W" shape.

[0072] Alternatively, in other embodiments, the number of concave portions 112 in the convex-concave members 110 can be at least two, and the convex-concave members 110 formed by the adjacent convex portions 111 and concave portions 112 are arranged in a wave shape.

[0073] Alternatively, in other embodiments, the number of convex-concave members 110 can be at least two, and the convex-concave members 110 are arranged along the side surface of the flanging assembly 11 facing the second mold base 20.

[0074] Specifically, the convex-concave members 110 can be arranged along a direction parallel to the extension direction of the flanging parting line 32 on the surface of the flanging assembly 11, and the convex-concave members 110 can act on different positions of the flanging area. Correspondingly, the flanging area is also provided with a material contact compensation area 31 corresponding to the convex-concave members 110.

[0075] In order to further reduce the possibility of cracks in the flanging area with the material contact compensation area 31 during flanging, in some embodiments, the connection between the adjacent convex portions 111 and concave portions 112 can be smoothly connected by a smooth curved surface.

[0076] During flanging, the flanging area first contacts the convex portions 111 on both sides of the concave portion 112 for flanging, and then gradually transitions to the middle until it contacts the concave portion 112, so that the material contact compensation area 31 is transitioned and flanged to change the flanging yield of the material contact compensation area 31, reduce the possibility of flanging cracks in the material contact compensation area 31 and its periphery, and achieve the purpose of improving the flanging yield.

[0077] Further, in the above embodiments and other similar embodiments, any one of the convex portions 111 and the concave portions 112 used to contact the surface of the flanging process piece 30 can be a smoothly connected curved surface.

[0078] In order to obtain the above-mentioned raised portion 111 and recessed portion 112 , in some embodiments, the flanging assembly 11 may be provided with a flanging contact surface 1101 on the side facing the second mold base 20 , and the raised portion 111 protrudes relative to the flanging contact surface 1101 along the first direction X.

[0079] See also Figure 3 The above-mentioned raised portion 111 protrudes from the flanging contact surface 1101 along the first direction X, and the side surface of the raised portion 111 used to contact the flanging process part 30 is a curved surface, that is, the connection between the raised portion 111 and the flanging contact surface 1101 can achieve a smooth transition through a smooth curved surface.

[0080] Correspondingly, in some embodiments, the above-mentioned recessed portion 112 is recessed relative to the raised portion 111 in the first direction X. At this time, the recessed portion 112 can be in the same plane as the flange contact surface 1101 in the first direction X or be raised a certain distance relative to the flange contact surface 1101, as long as the recessed portion 112 located between two adjacent raised portions 111 can be in a recessed state relative to the raised portion 111; alternatively, the above-mentioned recessed portion 112 can also be set to be recessed relative to the flange contact surface 1101 along the first direction X.

[0081] See also Figure 2 In some embodiments, the first mold base 10 further includes a die body 12, the flanging assembly 11 is arranged on the side of the die body 12 facing the second mold base 20, the second mold base 20 includes a punch body 21 for cooperating with the die body 12, and the flanging process part 30 to be processed is located on the side of the punch body 21 facing the die body 12.

[0082] The working process of the above-mentioned flanging die is as follows:

[0083] Before the flanging operation begins, the male mold body 21 and the female mold body 12 are separated. The flanging part 30 to be processed is placed on the male mold body 21. At this time, the shape of the flanging part 30 roughly matches the surface of the male mold body 21. As the first mold base 10 and the second mold base 20 gradually close, the female mold body 12 moves toward the second mold base 20 and contacts the flanging part 30, applying pressure to it. As the female mold body 12 continues to move downward, the male and female components 110 of the flanging assembly 11 first contact the flanging area of ​​the flanging part 30, causing the corresponding flanging area of ​​the flanging part 30 to bend. As the first mold base 10 and the second mold base 20 gradually approach until the flanging mold is completely closed, the flanging part 30 is gradually bent under the joint action of the two and formed into the desired flanging shape.

[0084] It is understood that the flanging die provided in the embodiment of the present application can change the direction and contact sequence of the flanging portion in the corresponding flanging process component 30 by means of the raised portion 111 and the recessed portion 112 provided on the first die base 10. The area opposite the flanging portion and the recessed portion 112 can provide a certain degree of compensation for the flanging process by delaying the flanging, thereby reducing the probability of flanging cracking and improving the flanging processing yield. The flanging process component 30 used to cooperate with the flanging die can be a part having an arc-shaped non-uniform flanging area, such as a side panel workpiece.

[0085] In a second aspect, the present application provides a molding device, characterized in that it includes any of the flanging molds described above.

[0086] The forming apparatus provided in the embodiments of the present application includes the aforementioned flanging dies. Therefore, the beneficial effects of including any one or more of the aforementioned flanging dies in the forming apparatus are not further elaborated herein. Furthermore, when the forming apparatus including the flanging dies is used to process corresponding parts, it can help improve the forming limit of the flanging sheet material, facilitate further thinning of the flanging sheet material, and achieve lightweight processing of the related parts.

[0087] Of course, it is understandable that the above-mentioned molding equipment can be applied to the field of stamping molding processing, and can also be applied to other processing fields other than stamping processing that require flanging processing of parts, such as injection molding processing, die-casting molding processing, sheet metal molding processing, etc.

[0088] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0089] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A flanging die, characterized in that: include: The first die base includes a flanging assembly, wherein the flanging assembly is provided with at least one convex-concave component, wherein the convex-concave component includes at least two spaced-apart raised portions and a recessed portion located between two adjacent raised portions; Second mold base; When the flanging assembly approaches the second die base, at least one of the male and female components is configured to sequentially contact the flanging process component located between the first die base and the second die base through the raised portion and the recessed portion.

2. The flanging die according to claim 1, characterized in that: The number of the convex-concave components is at least two, and the at least two convex-concave components are spaced apart along the surface of the flanging assembly facing the second mold base.

3. The flanging die according to claim 2, characterized in that: Any one of the convex-concave members includes two convex portions.

4. The flanging die according to claim 1, characterized in that: The adjacent protrusions and depressions are smoothly transitioned through a curved surface.

5. The flanging die according to claim 3, characterized in that: A surface of any one of the protrusion and the recess for contacting the flanging workpiece is a curved surface.

6. The flanging die according to any one of claims 1 to 5, characterized in that: The flanging component has a flanging contact surface on a side facing the second mold base, and the protrusion protrudes relative to the flanging contact surface along a first direction.

7. The flanging die according to claim 6, characterized in that: The recessed portion is recessed relative to the flange contact surface along the first direction.

8. The flanging die according to claim 1, characterized in that: The flanging process part has a material contact compensation area, and the convex-concave component is arranged opposite to the material contact compensation area.

9. The flanging die according to any one of claims 1 to 5, characterized in that: The first die base further includes a die body, and the flanging assembly is provided on a side of the die body facing the second die base; The second die base includes a male die body for cooperating with the female die body.

10. A molding device, characterized in that: The flanging die comprises the flanging die according to any one of claims 1 to 9.

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