Jaw device for stretch bending of sectional materials and stretch bending machine

Abstract

The utility model discloses a jaw device for stretch bending of a profile and a stretch bending machine, and the jaw device comprises a conical shell provided with a conical hollow cavity; the jaw is embedded in the conical hollow cavity, die assembly is achieved under the constraint of the conical hollow cavity, and a square cavity is formed in the middle of the jaw; one side of the push block is connected with the jaw, the other side of the push block is connected with a power source, and the push block drives the jaw to move in the conical hollow cavity so as to realize die assembly or die disassembly of the jaw; the universal block is embedded in the square cavity, a gap matched with the section of the profile is formed in the universal block, the profile is placed in the gap, and the cavity wall of the square cavity extrudes or loosens the outer wall of the universal block in the die closing or splitting process of the jaw, so that the size of the gap is adjusted to clamp or loosen the profile. The jaw can be quickly assembled and disassembled, the production efficiency is remarkably improved, and the problems that an existing mode is poor in universality and complex in assembly and disassembly are solved.

Description

Technical Field

[0001] This application relates to the field of bending forming equipment technology, and in particular to a jaw device and bending machine for bending profiles. Background Technology

[0002] Aerospace profile frame products are shaped using a stretch bending machine. The conical clamp of the stretch bending machine mainly plays the role of centering and clamping the raw materials, and is an essential mechanical component in the stretch bending forming process.

[0003] Existing dedicated stretch bending machine clamps are conical clamps with three- or four-lobed specialized jaws. The jaws are connected to a push block, which is screwed to a power source such as a hydraulic cylinder. The power source drives the push block, which in turn moves the multi-lobed jaws. Under the constraint of the conical outer shell, the multi-lobed jaws achieve mold closing and opening, thereby clamping or releasing the profile. However, current aerospace structural components are characterized by a wide variety of products and small batches. Traditional stretch bending machine jaws have poor versatility and adaptability. During jaw replacement, the entire conical outer shell needs to be rotated out, and then the multi-lobed jaws need to be removed from the conical outer shell for replacement. This process is inefficient, poses certain safety hazards, and cannot meet current market demands.

[0004] Therefore, in view of the above-mentioned technical problems, how to provide a jaw device with high versatility and convenient and quick jaw replacement is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a jaw device and bending machine for profile bending, which can quickly realize the loading and unloading of jaws, significantly improve production efficiency, and solve the problems of poor versatility and complicated loading and unloading of existing models.

[0006] To achieve the above objectives, this application provides a jaw clamping device for bending profiles, comprising:

[0007] A conical outer shell with a conical hollow cavity;

[0008] The jaws are embedded in the conical hollow cavity and achieve mold closing under the constraint of the conical hollow cavity; the jaws have a square cavity in the middle.

[0009] A push block is connected to the jaws on one side and a power source on the other side. The push block drives the jaws to move within the conical hollow cavity to achieve the closing or opening of the jaws.

[0010] A universal block is embedded in the square cavity. The universal block has a gap that matches the cross-section of the profile. The profile is placed in the gap. During the clamping or separating process, the cavity wall of the square cavity squeezes or loosens the outer wall of the universal block to adjust the size of the gap to clamp or loosen the profile.

[0011] Preferably, the number of jaws is three or four, and the multiple jaws together form a frustum structure adapted to the conical hollow cavity. The circumferential outer wall of the frustum structure is adapted to the cavity wall of the conical hollow cavity, and each jaw has a notch for forming the square cavity together.

[0012] Preferably, the cavity wall of the square cavity and the outer wall of the universal block both have toothed surfaces.

[0013] Preferably, there are multiple general-purpose blocks, which together form a square structure that fits the square cavity, and there are gaps between adjacent general-purpose blocks.

[0014] Preferably, the wall surface forming the gap is provided with a toothed surface structure adapted to the length and width of the profile.

[0015] Preferably, the conical outer shell is provided with waist-shaped through holes corresponding to the jaws, and a positioning bolt fixedly connected to the jaws is provided in the waist-shaped through hole. The positioning bolt is slidably disposed in the length direction of the waist-shaped through hole to provide axial guidance for the jaws.

[0016] Preferably, the power source is a hydraulic cylinder, and the base plate of the hydraulic cylinder is threadedly connected to the push block to drive the push block to move along the jaw axis.

[0017] Preferably, the push block has a retaining plate at one end away from the power source. The retaining plate extends into the jaws. Each jaw has a retaining groove that engages axially with the retaining plate. The retaining groove is radially spaced from the retaining plate to provide a radial distance for each jaw to converge and achieve mold closing.

[0018] Preferably, one side of the card holder faces the square cavity, and the outer wall of the card holder facing the square cavity abuts against the outer wall of the universal block.

[0019] A bending machine includes the jaw device for bending profiles as described above.

[0020] Compared to the aforementioned background technology, the jaws of this application, constrained by a conical outer shell, move via a push block to achieve mold closing and opening. A universal block is embedded in the square cavity of the jaws, and the universal block has a gap that matches the profile cross-section. Thus, during the clamping or opening process, the outer wall of the universal block is squeezed or released, and the profile is clamped or released by adjusting the size of the gap. This application can adapt to profiles with different cross-sections by replacing the universal block, resulting in higher replacement efficiency. When installing and removing the universal block, it is only necessary to conform the universal block to the cross-section of the profile, which can be used to adapt to various profile cross-sections, thus having higher versatility. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a front structural diagram of the jaw device for bending profiles provided in an embodiment of this application.

[0023] Figure 2 for Figure 1 Sectional view of AA;

[0024] Figure 3 This is a side view of the jaw device for bending profiles provided in an embodiment of this application.

[0025] Figure 4 for Figure 3 BB section view;

[0026] Figure 5 A schematic diagram of the mating structure of the jaws, general block, and push block provided in an embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the outer wall tooth surface structure of the general block provided in the embodiments of this application;

[0028] Figure 7 This is a schematic diagram of the internal tooth surface structure of the general block provided in the embodiments of this application.

[0029] In the diagram: 1-conical outer shell; 2-waisted through hole; 3-positioning bolt; 4-general block; 5-jaw; 6-profile; 7-push block; 8-clamping plate; 9-clamping groove; 10-cylinder base plate. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1 to 4 As shown, in this embodiment, a jaw device for bending profiles is provided. The device includes a conical shell 1, jaws 5, a push block 7, and a universal block 4. The conical shell 1 has a conical hollow cavity. The jaws 5 are embedded in the conical hollow cavity. The jaws 5 cooperate with the cavity wall of the conical hollow cavity. The rigid constraint of the conical shell 1 is used to realize the clamping of the jaws 5.

[0034] The jaws 5 have a square cavity in the middle, forming a jaw structure with an outer circle and an inner square. The universal block 4 is embedded in the square cavity. The universal block 4 can be adapted to various profile sections 6, making it more versatile. One side of the push block 7 is connected to the jaws 5, and the other side is connected to a power source. The power source can drive the push block 7 to move, which in turn drives the jaws 5 to move. Under the rigid constraint of the conical outer shell 1, the jaws 5 will gradually close or open during the movement.

[0035] Please refer to Figure 5 and Figure 6 The universal block 4 has a gap that matches the cross-section of the profile 6. The profile 6 can be placed in the gap. When the jaws 5 close the mold, the cavity wall of the square cavity of the jaws 5 will squeeze the outer wall of the universal block 4, thereby adjusting the size of the gap to clamp the profile 6. Conversely, when the jaws 5 open the mold, the cavity wall of the square cavity of the jaws 5 will gradually loosen, so that the outer wall of the universal block 4 is not squeezed by the cavity wall of the square cavity, making the gap of the universal block 4 larger and loosening the profile 6.

[0036] In summary, under the constraint of the conical outer shell 1, the jaws 5 of this application are moved by the push block 7 to achieve the closing and opening of the jaws 5. The universal block 4 is embedded in the square cavity of the jaws 5. The universal block 4 is provided with a gap that matches the cross-section of the profile 6. Thus, during the closing or opening of the jaws 5, the outer wall of the universal block 4 is squeezed or released, and the profile 6 is clamped or released by adjusting the size of the gap. This application can adapt to profiles 6 with different cross-sections by replacing the universal block 4. The universal block 4 has a simple structure, high manufacturing efficiency, strong versatility and adaptability, and higher replacement efficiency. When installing and disassembling the universal block 4, it is only necessary to conform the universal block 4 to the cross-section of the profile 6. It can be used to adapt to the cross-section of various profiles 6, and has higher versatility.

[0037] In some embodiments, the number of jaws 5 is three or four, please refer to Figure 5 The multi-lobed jaws 5 together form a frustum structure that fits the conical hollow cavity. The circumferential outer wall of the frustum structure fits the cavity wall of the conical hollow cavity. Please refer to [reference needed]. Figure 4 When the power source drives the push block 7 and jaws 5 to move, the multi-lobed jaws 5 will move axially and radially respectively under the action of the frustum structure and the conical hollow cavity, thereby achieving mold closing; when the power source drives the push block 7 and jaws 5 to move in the opposite direction, the frustum structure of the multi-lobed jaws 5 will be released from the conical hollow cavity, thereby achieving mold separation of the multi-lobed jaws 5.

[0038] Please refer to Figure 3 and Figure 5 Each jaw 5 has a notch for forming a square cavity. At the same time, toothed structures are provided on the cavity wall of the square cavity and the outer wall of the universal block 4 to increase the contact surface and contact friction. The traditional universal block 4 uses a tenon and mortise structure connection, which requires a high degree of fit. Wear caused by long-term use affects the clamping accuracy, and improper placement can easily damage the jaw 5. In contrast, this solution uses a toothed structure to increase clamping friction, which has an anti-slip effect, is not affected by wear, and makes clamping convenient and quick.

[0039] In addition, please refer to Figure 6 The number of general-purpose blocks 4 is also divided into multiple, and multiple general-purpose blocks 4 together form a square structure that fits the square cavity, while there are gaps between adjacent general-purpose blocks 4 for placing profiles 6.

[0040] Please refer to Figure 7 The wall surface forming the above-mentioned gap is provided with a toothed surface structure that is adapted to the length and width of the profile 6. This toothed surface structure can increase the clamping friction between the universal block 4 and the profile 6, making the clamping more stable and reliable, increasing the effective contact area, and achieving the clamping effect on the material.

[0041] In some embodiments, the conical outer shell 1 is provided with oblong through holes 2 corresponding one-to-one with the jaws 5. Positioning bolts 3, which are fixedly connected to the jaws 5, are provided within the oblong through holes 2. The positioning bolts 3 can slide along the length of the oblong through holes 2, thereby providing guidance for the axial movement of the jaws 5. Of course, since the jaws 5 also have a certain amount of movement in the radial direction in addition to axial movement, the positioning bolts 3 need to be designed to accommodate this radial movement. That is, there must be a certain distance between the head of the positioning bolt 3 and the conical outer shell 1, which is sufficient to allow for the radial movement of the jaws 5. In the width direction of the oblong through holes 2, the positioning bolts 3 can abut against the wall of the oblong through holes 2, thereby preventing the jaws 5 from wobbling freely within the conical outer shell 1 and improving the accuracy of the jaws 5.

[0042] The power source can be a hydraulic cylinder; please refer to [reference needed]. Figure 4 The cylinder base plate 10 of the hydraulic cylinder is threadedly connected to one end of the push block 7, thereby driving the push block 7 to move axially along the jaws 5. The end of the push block 7 facing away from the power source is provided with a retaining plate 8, which extends into the jaws 5. Each jaw 5 is provided with a retaining groove 9 that axially engages with the retaining plate 8. Please refer to... Figure 4 and Figure 5 When the push block 7 moves, it can drive each jaw 5 to move through the snap-fit ​​of the snap-fit ​​plate 8 and the snap-fit ​​groove 9. Each jaw 5 can achieve mold closing and mold opening under the constraint of the conical shell 1.

[0043] It should be noted that, since the jaws 5 have radial movement, the locking slots 9 can be arranged radially at intervals from the locking discs 8, such as... Figure 4 As shown, this interval provides a movement space for each jaw 5 to come together and achieve mold closing.

[0044] In addition, the clamping plate 8 faces the square cavity on one side, and the outer wall of the clamping plate 8 facing the square cavity abuts against the outer wall of the universal block 4. Thus, when the push block 7 moves, it can drive the jaws 5 to move axially on the one hand, and push the universal block 4 to move synchronously on the other hand, so that the fit between the jaws 5 and the universal block 4 is more accurate.

[0045] In some embodiments, the profile 6 can have a T-shaped cross section, and the material can be 7A09-O state aluminum alloy. The push block 7 is made of 45 steel, and its hardness reaches 240-300HB after tempering treatment. The cylinder base plate 10 is made of 40CrMo structural steel, and its hardness reaches 240-300HB after tempering treatment. The conical shell 1 is made of 40CrMo structural steel, and its hardness reaches 240-300HB after tempering treatment. The surface is nitrided: the diffusion layer is greater than 0.5, and the hardness is greater than HV550°. The taper of the conical shell 1 is 28°±2′. The waist-shaped through holes 2 are evenly distributed on the conical shell 1. The jaws 5 and the general block 4 are made of 40Cr structural steel, and their hardness reaches 240-300HB after tempering treatment. The jaws 5 are provided with threaded holes at the corresponding positions of the positioning bolts 3. The general block 4 is divided into two or three parts, and both the inner and outer surfaces are provided with toothed structures. The toothed surfaces are quenched to a hardness of HRC40-45.

[0046] This application also provides a bending machine, which includes the above-mentioned jaw device for bending profiles, and therefore also has all the advantages of the jaw device. Of course, it also includes other necessary components that make up the bending machine, which will not be described in detail here, but can be referred to the prior art.

[0047] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0048] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A jaw clamping device for bending profiles, characterized in that, include: A conical outer shell (1) is provided with a conical hollow cavity; The jaws (5) are embedded in the conical hollow cavity and achieve mold closing under the constraint of the conical hollow cavity. The jaws (5) have a square cavity in the middle. The push block (7) is connected to the jaws (5) on one side and to a power source on the other side. The push block (7) drives the jaws (5) to move within the conical hollow cavity to achieve the closing or opening of the jaws (5). A universal block (4) is embedded in the square cavity. The universal block (4) has a gap that matches the cross section of the profile (6). The profile (6) is placed in the gap. During the clamping or separating process of the jaws (5), the cavity wall of the square cavity squeezes or loosens the outer wall of the universal block (4) to adjust the size of the gap to clamp or loosen the profile (6).

2. The jaw device for profile bending according to claim 1, characterized in that, The number of jaws (5) is three or four. The multiple jaws (5) together form a frustum structure that is adapted to the conical hollow cavity. The circumferential outer wall of the frustum structure is adapted to the cavity wall of the conical hollow cavity. Each jaw (5) is provided with a notch for forming the square cavity together.

3. The jaw device for profile bending according to claim 1, characterized in that, The cavity wall of the square cavity and the outer wall of the general block (4) are both toothed structures.

4. The jaw device for profile bending according to claim 3, characterized in that, The number of general blocks (4) is multiple, and the multiple general blocks (4) together form a square structure that is adapted to the square cavity, and there is a gap between adjacent general blocks (4).

5. The jaw device for profile bending according to claim 4, characterized in that, The wall surface forming the gap is provided with a toothed surface structure adapted to the length and width of the profile (6).

6. The jaw device for profile bending according to any one of claims 1-5, characterized in that, The conical outer shell (1) is provided with waist-shaped through holes (2) corresponding to the jaws (5). The waist-shaped through holes (2) are provided with positioning bolts (3) that are fixedly connected to the jaws (5). The positioning bolts (3) are slidably arranged in the length direction of the waist-shaped through holes (2) to provide axial guidance for the jaws (5).

7. The jaw device for profile bending according to claim 6, characterized in that, The power source is a hydraulic cylinder. The base plate (10) of the hydraulic cylinder is threadedly connected to the push block (7) to drive the push block (7) to move axially along the jaws (5).

8. The jaw device for profile bending according to claim 6, characterized in that, The push block (7) has a snap-fit ​​plate (8) at one end away from the power source. The snap-fit ​​plate (8) extends into the jaws (5). Each jaw (5) has a snap-fit ​​groove (9) that is axially snapped into the snap-fit ​​plate (8). The snap-fit ​​groove (9) is radially spaced from the snap-fit ​​plate (8) to provide a radial distance for each jaw (5) to converge and achieve mold closing.

9. The jaw device for profile bending according to claim 8, characterized in that, The card plate (8) faces the square cavity on one side, and the outer wall of the card plate (8) facing the square cavity abuts against the outer wall of the universal block (4).

10. A bending machine, characterized in that, Includes the jaw device for bending profiles as described in any one of claims 1-9.

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