CN220111996U

CN220111996U - Curved arc frock and curved arc equipment that has it

Info

Publication number: CN220111996U
Application number: CN202321607034.8U
Authority: CN
Inventors: 张江峡; 闫月雷; 施剑勇; 王波; 丁云帆; 廖朋; 邓玉强
Original assignee: Chengdu Guangtong Automobile Co ltd; Gree Altairnano New Energy Inc
Current assignee: Chengdu Guangtong Automobile Co ltd; Gree Altairnano New Energy Inc
Priority date: 2023-06-21
Filing date: 2023-06-21
Publication date: 2023-12-01
Anticipated expiration: 2033-06-21

Abstract

The utility model relates to an arc bending tool and an arc bending device with the same, wherein the arc bending tool comprises a profiling and an arc bending chain, and the profiling is provided with a supporting surface and an arc bending surface which are connected; the curved arc chain is arranged on the profiling, the curved arc chain comprises a connecting piece and a plurality of curved arc pieces arranged on one side of the connecting piece, the curved arc pieces are sequentially connected in the direction away from the connecting piece, a rotating assembly is connected between the connecting piece and the adjacent curved arc pieces, the adjacent curved arc pieces are connected through the rotating assembly, and the curved arc chain enables the curved arc pieces to be sequentially attached to the curved arc surfaces through the rotating assemblies. The arc bending tool solves the problem of high manual machining difficulty.

Description

Curved arc frock and curved arc equipment that has it

Technical Field

The utility model relates to the field of arc bending equipment, in particular to an arc bending tool and arc bending equipment with the same.

Background

In the current passenger car industry, due to the pursuit of people on the lines of the car body, the proportion of curved surfaces on the car body of the passenger car is increased, so that the number of workpieces with the radian of the framework is increased, wherein part of the water flowing grooves need to be bent according to the radian of the framework, and in order to prevent the water leakage of the car body, the design strength required by the framework of the passenger car and the water flowing grooves is higher. The existing method for manufacturing the bending arc through the manual convection flume is large in processing difficulty and poor in precision, the manufacturing standard is difficult to be achieved, and the manufacturing is often reworked after being completed, so that waste of manpower and material resources is caused.

Disclosure of Invention

The utility model provides an arc bending tool and arc bending equipment with the same, and aims to solve the problem of high manual machining difficulty.

In a first aspect, the present utility model provides an arc bending tool, comprising:

the profiling is provided with a supporting surface and an arc surface which are connected; and

the arc bending chain is arranged on the profiling, the arc bending chain comprises a connecting piece and a plurality of arc bending pieces arranged on one side of the connecting piece, the arc bending pieces are sequentially connected in the direction away from the connecting piece, a rotating assembly is connected between each connecting piece and the adjacent arc bending piece, the adjacent arc bending pieces are connected through the rotating assembly, and the arc bending chain enables the arc bending pieces to be sequentially attached to the arc bending surface through the rotating assembly.

In one possible implementation manner, the rotating assembly includes a first fitting part and a second fitting part which are connected and are in running fit, the first fitting part and the second fitting part are respectively fixedly arranged on the connecting piece and the arc bending piece which are connected, and the first fitting part and the second fitting part are respectively fixedly arranged on two adjacent arc bending pieces.

In one possible implementation manner, the connecting end of the connecting piece is provided with a connecting portion, the connecting portion includes a first connecting portion and a second connecting portion, the first connecting portion is used for being matched with the first assembly part, the second connecting portion is used for being matched with the second assembly part, the connecting portion is arranged on two opposite sides of each curved arc piece, and each curved arc piece is arranged in a central symmetrical structure.

In one possible implementation, the first fitting part is fitted with the first connecting part, the second fitting part is fitted with the second connecting part, the first fitting part is flush with the outer surfaces of the connecting part and the curved part, and the second fitting part is flush with the outer surfaces of the connecting part and the curved part.

In one possible implementation, the first fitting includes a coupling bolt, and the second fitting is a coupling nut that mates with the first fitting.

In one possible implementation manner, the first connecting portion and the second connecting portion are both in an opening structure, an opening edge of the first connecting portion is adapted to an edge shape of the connecting bolt, and an opening edge of the second connecting portion is semicircular.

In one possible implementation, the device further comprises a support assembly part, wherein the support assembly part is connected with the first assembly part or the second assembly part, and the support assembly part is arranged at the middle position of the end face of the curved part.

In one possible implementation manner, the curved chain is used for being matched with a groove-shaped piece, a groove-shaped opening is formed in the groove-shaped piece, the groove-shaped opening is clamped on the curved chain, and the outer surface of the curved chain is used for supporting and matching with the inner wall surface of the groove-shaped opening.

In one possible implementation, the groove-shaped member is formed by being attached to the curved chain, and curved on the curved chain by a fire red process.

In a second aspect, the present utility model provides an arc bending apparatus comprising: the arc bending tool of the first aspect.

Compared with the prior art, the technical scheme provided by the embodiment of the utility model has the following advantages:

according to the arc bending tool and the arc bending equipment with the same, the connecting piece of the arc bending chain is attached to the supporting surface of the profiling, the plurality of arc bending pieces of the arc bending chain are attached to the arc bending surface of the profiling through the rotating assembly, the arc bending chain is used for being matched with the groove-shaped piece, the groove-shaped piece is clamped into the arc bending chain from the upper side of the arc bending chain, and the groove-shaped piece can be subjected to forming treatment in various processing modes such as heat treatment, so that the groove-shaped piece and the arc bending chain are fully attached to form, and the arc bending of the groove-shaped piece is achieved. By the mode, the processing difficulty can be reduced, the bending precision of the groove-shaped piece can be guaranteed by means of the profiling at the bottom of the bending chain, the bending chain can be bent freely, and the production requirement of multiple radians is met.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

Fig. 1 is a schematic diagram of an overall structure of an arc bending tool according to an embodiment of the present utility model.

Fig. 2 is a schematic structural diagram of a profiling in an arc bending tool according to an embodiment of the present utility model.

Fig. 3 is a schematic structural diagram of a curved chain in a curved tool according to an embodiment of the present utility model.

Fig. 4 is a schematic structural diagram of a connecting piece in an arc bending tool according to an embodiment of the present utility model.

Fig. 5 is a schematic structural diagram of an arc bending member in an arc bending tool according to an embodiment of the present utility model.

Reference numerals illustrate:

1. profiling; 11. a support surface; 12. a curved surface;

2. an arc bending chain; 21. a connecting piece; 22. an arc bending piece; 23. a first connection portion; 24. a second connecting portion;

3. a rotating assembly; 4. a channel.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "upper," "above," "front," "rear," and the like, may be used herein to describe one element's or feature's relative positional relationship or movement to another element's or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figure experiences a position flip or a change in attitude or a change in state of motion, then the indications of these directivities correspondingly change, for example: an element described as "under" or "beneath" another element or feature would then be oriented "over" or "above" the other element or feature. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

The method aims at solving the problems that the existing method for manufacturing the arc by using the manual convection groove is large in processing difficulty and poor in precision, and is difficult to reach the manufacturing standard, and the manufacturing is often reworked after the manufacturing is finished, so that the waste of manpower and material resources is caused; the arc bending tool provided by the utility model can reduce the processing difficulty, ensure the arc bending precision of the groove-shaped piece by means of the profiling at the bottom of the arc bending chain, and the arc bending chain can be freely bent to meet the production requirement of multiple radians.

Referring to fig. 1-5, an embodiment of the present utility model provides an arc bending tool, including:

the explorator 1 is provided with a supporting surface 11 and an arc surface 12 which are connected; and

the curved arc chain 2 is arranged on the profiling 1, the curved arc chain 2 comprises a connecting piece 21 and a plurality of curved arc pieces 22 arranged on one side of the connecting piece 21, the curved arc pieces 22 are sequentially connected in the direction away from the connecting piece 21, a rotating component 3 is connected between each connecting piece 21 and the adjacent curved arc pieces 22, the adjacent curved arc pieces 22 are connected through the rotating component 3, and the curved arc chain 2 sequentially attaches a plurality of curved arc pieces 22 to the curved arc surface 12 through a plurality of rotating components 3.

The connecting piece 21 of the curved chain 2 is attached to the supporting surface 11 of the profiling 1, the plurality of curved pieces 22 of the curved chain 2 are attached to the curved surface 12 of the profiling 1 through the rotating component 3, the curved chain 2 is used for being matched with the groove-shaped piece 4, the groove-shaped piece 4 is clamped into the curved chain 2 from the upper side of the curved chain 2, and the groove-shaped piece 4 can be subjected to forming treatment in various processing modes such as heat treatment, so that the groove-shaped piece 4 and the curved chain 2 are fully attached and formed, and the curved of the groove-shaped piece 4 is realized. By means of the method, processing difficulty can be reduced, bending accuracy of the groove-shaped piece 4 can be guaranteed by means of the profiling 1 located at the bottom of the bending chain 2, the bending chain 2 can be bent freely, and production requirements of multiple radians are met.

The surface of the profiling 1, which is used for being matched with the curved chain 2, is a matching surface, and the matching surface is divided into a supporting surface 11 and a curved surface 12. In the utility model, the matching surface of the profiling 1 is the upper surface of the profiling 1, the profiling 1 is matched with the curved chain 2 through the upper surface of the profiling 1, and meanwhile, the stability of the curved chain 2 on the profiling 1 can be ensured. When the groove-shaped pieces 4 with different bending radians are manufactured, only the profiling 1 needs to be replaced, the proper profiling 1 with the cambered surface 12 is selected to be used for attaching and abutting the cambered chain 2, and the cambered piece 22 of the cambered chain 2 is lapped on the profiling 1, so that the groove-shaped pieces 4 with any radian can be manufactured conveniently.

Referring to fig. 1-5, the curved chain 2 is configured to cooperate with a trough-shaped member 4, the trough-shaped member 4 is provided with a trough-shaped opening, the trough-shaped opening is clamped on the curved chain 2, and the outer surface of the curved chain 2 is configured to support an inner wall surface cooperating with the trough-shaped opening; the groove-shaped opening of the groove-shaped piece 4 is arranged downwards, the groove-shaped piece 4 moves downwards from the upper part of the curved chain 2, namely, the groove-shaped piece 4 moves from the upper part of the curved chain 2 towards the direction close to the curved chain 2 until the groove-shaped piece 4 is buckled on the curved chain 2, and then the groove-shaped piece 4 is processed, so that the groove-shaped piece 4 can be bent according to the bending radian of the curved chain 2, and the bending shape of the groove-shaped piece 4 is realized.

The groove-shaped piece 4 is bonded with the curved arc chain 2, and is curved on the curved arc chain 2 through a fire red process; the inner wall of the groove-shaped opening is supported through the peripheral side of the curved arc chain 2, the two opposite sides of the groove-shaped piece 4 are respectively clamped on the outer wall surface of the curved arc chain 2, after the groove-shaped piece 4 is subjected to fire red treatment, the groove-shaped piece 4 can be bent according to the bending radian of the profiling 1, the curved arc shaping is attached according to the modeling of the profiling 1, and the overall shape of the curved groove-shaped piece 4 can be ensured. In the present utility model, the channel member 4 is molded by the fire red process, and of course, the channel member 4 may be heated and deformed by other heat treatment methods in actual use.

The rotating assembly 3 comprises a first assembly part and a second assembly part which are connected and are in rotating fit, the first assembly part and the second assembly part are respectively and fixedly arranged on the connecting piece 21 and the arc bending piece 22 which are connected, and the first assembly part and the second assembly part are respectively and fixedly arranged on two adjacent arc bending pieces 22. In the present utility model, for convenience of description, taking the example that the first assembly member is disposed on the connecting member 21, the second assembly member is disposed on the curved member 22 adjacent to the connecting member 21, the first assembly member is connected to the second assembly member, and the first assembly member and the second assembly member are rotationally matched, so that the first assembly member can be rotationally disposed relative to the second assembly member; so that the second assembly part can be rotationally arranged relative to the first assembly part under the condition that the position of the connecting piece 21 is unchanged, and the first assembly part drives the arc bending piece 22 to synchronously move under the rotation action of the first assembly part; the curved part 22 adjacent to the connecting piece 21 can be driven by the rotating component 3 to rotate around the connecting piece 21. Similarly, the two curved arc pieces 22 are connected by the rotating component 3, and one curved arc piece 22 can rotate relative to the other curved arc piece 22; in the case that a plurality of curved arc members 22 are connected, the whole of the curved arc members can be bent to form an arc-shaped structure arrangement, thereby realizing the condition that the curved arc chain 2 is attached to the profiling 1.

The connecting end of the connecting piece 21 is provided with a connecting portion, the connecting portion comprises a first connecting portion 23 and a second connecting portion 24, the first connecting portion 23 is used for being matched with the first assembly part, the second connecting portion 24 is used for being matched with the second assembly part, the connecting portions are arranged on two opposite sides of each curved arc piece 22, and the curved arc pieces 22 are arranged in a central symmetrical structure. Through being provided with connecting portion on connecting piece 21 and curved arc piece 22, rotating assembly 3 cooperatees with the connecting portion to the installation of rotating assembly 3 of being convenient for, the mounted position of guarantee rotating assembly 3. Similarly, since the two opposite sides of the curved member 22 are used for realizing connection, and the stable rotation of the curved chain 2 is also required to be ensured, the connection parts of the curved chain 2 at the two ends in the same length direction are a first connection part 23 and a second connection part 24 respectively; the connecting parts of the two ends of the curved arc chain 2 in the same width direction are the first connecting part 23 and the second connecting part 24 respectively, so that the whole curved arc piece 22 is arranged in a central symmetrical structure, and the reliability and the stability of rotation are ensured.

Referring to fig. 1-5, the first fitting and the first connecting portion 23 are in embedded fit, the second fitting and the second connecting portion 24 are in embedded fit, the first fitting is flush with the outer surfaces of the connecting piece 21 and the curved piece 22, and the second fitting is flush with the outer surfaces of the connecting piece 21 and the curved piece 22; the first assembly part is embedded in the first connecting part 23 through the embedded matching of the first assembly part and the first connecting part 23, the second assembly part is embedded in the second connecting part 24 through the embedded matching of the second assembly part and the second connecting part 24, after the first assembly part and the second assembly part are connected through the rotating assembly 3, the first assembly part and the second assembly part are embedded between the connecting positions of two adjacent parts, and the outer surfaces of the first assembly part and the second assembly part are flush with the outer surfaces of the curved arc piece 22 and the connecting piece 21, so that the outer surfaces of the whole curved arc chain 2 are flush, and further, after the groove-shaped piece 4 is buckled on the curved arc chain 2, the flatness of the inner wall surface of the groove-shaped piece 4 can be ensured; in addition, the opposite side surfaces of the curved chain 2 are in surface contact with the spigot of the groove 4, so that the spigot of the groove 4 is prevented from being deformed.

The first assembly part comprises a connecting bolt, and the second assembly part is a connecting nut matched with the first assembly part; through the spiro union cooperation of coupling nut and connecting bolt, both can ensure the connection between first assembly part and the second assembly part to and normal running fit's relation, the cooperation between coupling nut and the connecting bolt still makes between first assembly part and the second assembly part be detachable fit simultaneously, when curved arc chain 2 takes place the damage and needs maintenance or change, through the spiro union cooperation of first assembly part and second assembly part, dismantle coupling nut from connecting bolt, can realize the change or the maintenance of rotating assembly 3, curved arc piece 22 and/or connecting piece 21, reduce cost, raise the efficiency.

Of course, the first assembly part and the second assembly part can also be connection bearings, wherein a connection shaft is fixed on one connection bearing, the other end of the connection shaft is rotationally connected with the other connection bearing, and the two connection bearings are respectively arranged on the connection piece 21 and the adjacent curved piece 22; and two connecting bearings are respectively arranged on two adjacent curved arc pieces 22. Through the running fit of the connecting bearing and the connecting shaft, the parts connected with the connecting bearing are driven to rotate relatively, and then the bending of the curved chain 2 is realized.

The first connecting part 23 and the second connecting part 24 are both in an opening structure, the opening edge of the first connecting part 23 is matched with the edge shape of the connecting bolt, and the opening edge of the second connecting part 24 is in a semicircular arc shape; the first assembly part and the second assembly part are embedded into the opening structure, so that the flatness of the outer surface of the curved chain 2 is guaranteed. The edge of the opening of the first connecting portion 23 is matched with the edge of the connecting bolt, and illustratively, the edge of the opening of the first connecting portion 23 is semi-hexagonal, the connecting bolt can adopt an M8 type bolt, the corresponding connecting nut is an M8 type nut, and the edge of the opening of the first connecting portion 23 is matched with the connecting bolt, so that the tight connection between the connecting bolt and the first connecting portion 23 is realized, meanwhile, the other half of the connecting bolt can be matched with the second connecting portion 24 in the rotation process of the second connecting portion 24, the second connecting portion 24 is set to be semi-circular arc, the rotation reliability of the second connecting portion 24 is guaranteed, and the interference between the second connecting portion 24 and the connecting bolt is avoided.

The half hexagonal notch of the connecting piece 21 is spliced and welded with a connecting bolt, the half hexagonal notch of the curved arc piece 22 adjacent to the connecting piece 21 is spliced and welded with a nut which is arranged opposite to the half hexagonal notch of the connecting piece 21 and is positioned at the half hexagonal notch of the curved arc piece 22; and so on, splicing and welding the connecting bolts and the connecting nuts on the curved arc piece 22, polishing the surfaces of the connecting bolts and the connecting nuts to be smooth, and keeping the height of the welded part and the plane consistent; the rotary hinge is formed by matching the connecting bolts with the corresponding connecting nuts.

The profiling 1 can be an arc square tube, and the radian of the profiling is used for bending the straight rod piece according to the required radian of the groove piece 4, so that the standard of the bending arc is achieved. The connecting piece 21 can be a connecting pipe, and the section shape of the connecting pipe can be matched with the slot-shaped opening of the slot-shaped piece 4; the curved member 22 may be a curved tube having the same cross-sectional shape and the same size as the connecting tube. Since the connecting parts are formed on the connecting piece 21 and the curved piece 22, the connecting parts can be formed on the connecting piece 21 and the curved piece 22 by laser cutting. The above is merely an exemplary description of the present embodiment, and other processing manners or shapes may be used in actual use. Of course, the number of the arc bending members 22 is not limited in this embodiment, and the number may be increased or decreased according to the actual arc length, and this embodiment is exemplified by seven arc bending members 22.

Of course, the device further comprises a support assembly part, wherein the support assembly part is connected with the first assembly part or the second assembly part, and the support assembly part is arranged at the middle position of the end surface of the curved part 22; the effect of overlap support is achieved by the support connection 21. Illustratively, the support fitting may be a support nut, illustratively an M10-type nut, and the M10-type nut is screwed into the M8-type bolt to overlap, thereby achieving overlap support.

Referring to fig. 1-5, in summary, according to the arc bending tool provided in this embodiment, the arc bending chain 2 can manufacture different groove-shaped arc pieces 22 according to the required radian, only the radian modeling of the master model 1 needs to be replaced, and the arc bending chain 2 is lapped on the master model 1 to facilitate manufacturing of groove-shaped pieces 4 with any radian. In addition, the curved arc chain 2 is lapped on the profiling 1 along the radian, the radian is that the profiling 1 fixes the curved arc, two sides of the curved arc chain 2 are the spigot supporting surfaces 11 of the groove-shaped pieces 4, the spigot on two sides of the groove-shaped pieces 4 are clamped on the curved arc chain 2 to carry out the fire red treatment and then are bent according to the radian of the profiling 1 which is leaning on under the curved arc chain, and the curved arc is laminated and formed according to the shape of the profiling 1; the spigot of the groove-shaped piece 4 can be prevented from deforming, the tool is simple in structure and convenient to manufacture, meanwhile, manufacturing standards and precision are guaranteed, and the tool can be used as an arc-shaped inspection tool.

Referring to fig. 1-5, an embodiment of the present utility model provides an arc bending apparatus, including an arc bending tool as described in the foregoing embodiment.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

The foregoing is only a specific embodiment of the utility model to enable those skilled in the art to understand or practice the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides an arc frock which characterized in that includes:

2. The arc bending tool of claim 1, wherein the rotating assembly comprises a first assembly part and a second assembly part which are connected and are in rotating fit, the first assembly part and the second assembly part are respectively and fixedly arranged on the connecting piece and the arc bending piece which are connected, and the first assembly part and the second assembly part are respectively and fixedly arranged on two adjacent arc bending pieces.

3. The arc bending tool as claimed in claim 2, wherein the connecting end of the connecting piece is provided with a connecting portion, the connecting portion includes a first connecting portion and a second connecting portion, the first connecting portion is used for being matched with the first assembly, the second connecting portion is used for being matched with the second assembly, the connecting portion is provided on opposite sides of each arc bending piece, and each arc bending piece is arranged in a central symmetrical structure.

4. The arc bending tool of claim 3, wherein the first fitting and the first connecting portion are in embedded engagement, the second fitting and the second connecting portion are in embedded engagement, the first fitting is flush with the outer surfaces of the connecting member and the arc bending member, and the second fitting is flush with the outer surfaces of the connecting member and the arc bending member.

5. The arc bending tool of claim 3 wherein the first fitting includes a coupling bolt and the second fitting is a coupling nut that mates with the first fitting.

6. The arc bending tool of claim 5, wherein the first connecting portion and the second connecting portion are of an opening structure, an opening edge of the first connecting portion is matched with an edge shape of the connecting bolt, and an opening edge of the second connecting portion is semicircular.

7. The arc bending tool of any one of claims 2-6, further comprising a support fitting, the support fitting being connected to the first fitting or the second fitting, the support fitting being disposed at a location intermediate the end faces of the arc bending member.

8. The arc bending tool of any one of claims 1-6, wherein the arc bending chain is used for being matched with a groove-shaped piece, a groove-shaped opening is formed in the groove-shaped piece, the groove-shaped opening is clamped on the arc bending chain, and the outer surface of the arc bending chain is used for supporting an inner wall surface matched with the groove-shaped opening.

9. The arc bending tool of claim 8, wherein the groove-shaped piece is formed by being attached to the arc bending chain, and is bent on the arc bending chain by a fire red process.

10. An arc bending apparatus comprising an arc bending tool as claimed in any one of claims 1 to 9.