A bending center die with fixed stress points and adaptive locking for shape deviations.

Abstract

This invention discloses a bending center mold with a fixed force application point and adaptive locking for shape deviations, comprising a mold body, a connecting block, and a mold clamping assembly. The mold body is inserted into the connecting block, forming a bearing mating surface and a positioning mating surface. The mold clamping assembly includes an adaptive clamping pin, a wedge block, and a wedge block pressing component. The adaptive clamping pin is embedded in the vertical wall of the mold body facing the clamping groove and can rotate freely. The wedge block is inserted into the clamping groove on the outside of the mold body, with one side of the wedge block contacting the adaptive clamping pin and the other side of the wedge block forming a clamping mating surface with the inner wall of the clamping groove. The angle between the clamping mating surface and the positioning mating surface does not exceed 40°, enabling self-locking. The wedge block pressing component is used to drive the clamping of the wedge block. This invention can adaptively handle manufacturing deviations, and the fixed point of application of the clamping force allows it to adapt to changes in the position and magnitude of the force under different working conditions.

Description

Technical Field

[0001] This invention relates to the field of sheet metal bending, and in particular to a bending center mold with a fixed stress point and adaptive locking for shape deviation. Background Technology

[0002] In the sheet metal manufacturing industry, bending is the most technically complex, the most difficult to control in terms of quality, and the least automated process. Especially in recent years, the sheet metal industry has seen an increasing demand for automated laser welding; however, existing bending technologies do not meet the required precision and cannot satisfy the needs of automated laser welding in the next stage, severely hindering the industry's development and progress.

[0003] Bending centers are a relatively new type of processing equipment that has emerged in the sheet metal industry in recent years, offering significantly improved processing precision and efficiency compared to traditional methods. However, due to insufficient technology in areas such as mold assembly and adjustment, high-end industries like electrical cabinets, elevators, and security doors, which have high demands for precision and automation, are largely dominated by foreign products. For example, Italian company Salvagnini's products are expensive, costing up to 4 million RMB, equivalent to ten times the price of domestically produced equipment. Salvagnini's core advantage lies in the automatic adjustment and assembly of molds. Therefore, only by solving the problem of automatic mold clamping can automatic mold adjustment and assembly be achieved. It can be said that reliable, efficient, and high-precision mold clamping is a bottleneck and key technical challenge restricting the industry's move towards intelligent manufacturing.

[0004] Current mainstream bending center die clamping technologies mainly employ two methods: surface fitting and force clamping. However, both of these clamping methods have the following shortcomings during use and require improvement:

[0005] 1. For surface mating, the requirements for mating clearance are relatively high. If the clearance is too small, it is easy to jam; if the clearance is too large, it is difficult to guarantee accuracy. In addition, the clearance will increase after the mold wears out. Furthermore, most molds are irregularly shaped, making them difficult to process, resulting in poor manufacturability and high cost. Therefore, they are not suitable for mass production.

[0006] 2. For force-clamping methods, due to the limitations of the mechanical structure, the horizontal force of the die is relatively large. Force clamping is not a major issue when bending thin plates under light loads, but under heavy loads, the die often fails to clamp tightly, severely affecting bending accuracy. Figure 23 As shown. Furthermore, force clamping makes it difficult to achieve automatic locking and disassembly, and cannot meet the needs of automatic tool assembly and mold changing.

[0007] 3. For surface fitting and force clamping, the clamping of the mold requires external force for locking. For example, when using cylinder clamping, each mold needs to be equipped with a cylinder, which makes air pipe wiring difficult and easy to get tangled with other moving mechanisms, causing safety accidents.

[0008] 4. The inability to fine-tune the mold precision, processing errors, mold wear and other factors will all cause errors in mold precision, affecting bending accuracy.

[0009] Chinese invention patent CN113751592A, entitled "A Multi-sided Bending Center Mold with Self-locking and Automatic Assembly / Disassembly Functions," includes an upper mold body, a self-locking mechanism, and a clamping mechanism. The self-locking mechanism comprises a fixed inclined block and a locking block with inclined surfaces, enabling self-locking and mold clamping. However, in practical applications, it still has the following shortcomings:

[0010] 1. The upper mold body is clamped entirely by horizontal friction. When impact or vibration occurs during the machine tool's processing, the upper mold body may fail to clamp or fall off.

[0011] 2. The inability to adapt to manufacturing deviations leads to uncontrollable clamping force points. However, the upper die at the bending center involves both free bending and flattening processes, requiring stable clamping force and clamping force application points.

[0012] 3. It cannot compensate for elastic deformation caused by working loads, and the contact state of the contact surface is uncontrollable.

[0013] 4. For different processes, the load characteristics of the mold are different, and the mold cannot adapt to different load characteristics.

[0014] 5. During mold operation, under load, the mold and its contact surfaces undergo microscopic elastic deformation, causing changes in the contact state. This can result in a transition from surface contact to line or point contact. Once line or point contact occurs, localized plastic deformation is inevitable, affecting the local coefficient of friction and potentially leading to locking or jamming, making unlocking impossible. Summary of the Invention

[0015] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a bending center mold with a fixed force point and adaptive locking for shape deviation. This bending center mold with a fixed force point and adaptive locking for shape deviation can adapt to deviations in processing and manufacturing, and the clamping force has a fixed point of application, which can adapt to changes in the position and magnitude of the force under different working conditions.

[0016] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0017] A bending center mold with a fixed force point and adaptive locking for shape deviation includes a mold body, a connecting block, and a mold clamping assembly.

[0018] The connecting block has a bearing surface and a clamping groove.

[0019] The mold body has a bearing surface two and a positioning protrusion at its end; bearing surface one and bearing surface two cooperate to form a bearing mating surface; the positioning protrusion is inserted into the clamping groove of the connecting block and forms a positioning mating surface.

[0020] The mold clamping assembly includes an adaptive clamping pin, a wedge block, and a wedge block clamping component.

[0021] The adaptive clamping pin is embedded in the vertical wall of the mold body facing the clamping groove and can rotate freely.

[0022] The wedge block is inserted into the clamping groove on the outside of the mold body. One side of the wedge block is in contact with the adaptive clamping pin, and the other side of the wedge block forms a clamping mating surface with the inner wall of the clamping groove. The included angle between the clamping mating surface and the positioning mating surface does not exceed 40°.

[0023] The wedge clamping component is used to drive the clamping of the wedge block.

[0024] The angle α1 between the bearing mating surface and the horizontal plane is 120–215°; the angle α2 between the positioning mating surface and the horizontal plane is 30–120°; and the angle α3 between the clamping mating surface and the horizontal plane is 60–120°.

[0025] The angles between the bearing mating surface, the positioning mating surface, and the clamping mating surface and the horizontal plane can be set using any one of the following five methods:

[0026] Setting method 1: α1 = 180°, α2 = 30~120°, α3 = 60~120°.

[0027] Setting method 2: α1 = 120~215°, α2 = 90°, α3 = 60~120°.

[0028] Setting method 3: α1 = 120~215°, α2 = 30~120°, α3 = 90°.

[0029] Setting method four: α1 = 180°, α2 = 90°, α3 = 90°.

[0030] Setting method 5: α1 = 135°, α2 = 90°, α3 = 90°.

[0031] The cross-section of the adaptive clamping pin is semi-circular, including an arc surface and a plane; wherein, the arc surface is embedded in the vertical wall of the mold body facing the clamping groove and can rotate; the plane slides in contact with the wedge block; the semi-circular shape can be a semi-circle, a small semi-circle, or a large semi-circle.

[0032] A freely rotatable bearing pin is embedded in the bearing surface two, and the contact surface between the bearing pin and the bearing surface one is a plane.

[0033] The wedge clamping components are springs, cylinders, hydraulic cylinders, or linear electric push rods.

[0034] The mold body is also provided with a mold limiting structure at its end; the mold limiting structure includes a horizontal limit and / or a vertical limit; the horizontal limit is horizontally set on the outer side of the bearing surface and extends into the connecting block; the vertical limit is vertically set on the outer side of the positioning protrusion and extends into the connecting block.

[0035] The mold clamping assembly also includes a wedge block clamping guide mechanism.

[0036] The wedge clamping guide mechanism includes a guide block, a guide pin, and a vertical guide groove.

[0037] The vertical guide groove is vertically set in the positioning protrusion of the mold body.

[0038] The guide block is slidably arranged in the vertical guide groove, and the outer side of the guide block is connected to or integrated with the middle of the wedge block.

[0039] The guide block is provided with guide pin guide groove and clamping pin guide groove.

[0040] The guide pin is horizontally inserted into the positioning protrusion, passes through the guide pin guide groove, and is adapted to the guide pin guide groove.

[0041] The middle part of the adaptive clamping pin is located in the clamping pin guide groove, and both ends of the adaptive clamping pin have clamping pin side stops.

[0042] There are two guide pins, arranged in parallel; the guide pin guide grooves are arranged at an angle.

[0043] A mold precision adjustment mechanism includes a mold body, an adjustment arm, an adjustment screw, and an adjustment sleeve.

[0044] The adjusting arm is located inside or outside the mold body, and one end of the adjusting arm is connected to or integrated with the mold body.

[0045] A. When the adjusting support arm is located inside the mold body, the mold body has an adjusting groove to accommodate the adjusting support arm, and there is an adjusting gap between the outer periphery of the adjusting support arm and each wall surface of the adjusting groove.

[0046] The adjusting screw is set horizontally, with a pitch of P1. The adjusting screw is connected to the other end of the adjusting arm via a threaded connection.

[0047] The adjusting screw sleeve has internal and external threads, with the internal thread pitch being P1 and the external thread pitch being P2. The internal thread of the adjusting screw sleeve is coaxially threaded around the outer circumference of the adjusting screw, and the external thread of the adjusting screw sleeve mates with the threaded pair of the mold body.

[0048] B. When the adjusting arm is located outside the mold body, there is a vertical adjusting gap between the adjusting arm and the mold body.

[0049] Adjust the screw to a horizontal position, adjust the screw pitch to P1, and adjust the screw to connect with the threaded pair of the mold body.

[0050] The adjusting screw sleeve has internal and external threads, with the internal thread pitch being P1 and the external thread pitch being P2; the internal thread of the adjusting screw sleeve is coaxially threaded around the outer circumference of the adjusting screw, and the external thread of the adjusting screw sleeve mates with the threaded pair of the adjusting support arm.

[0051] By rotating the adjusting screw sleeve, the precision of the mold body can be adjusted; when the adjusting screw sleeve rotates once, the mold body can achieve a horizontal adjustment distance Δ, then Δ=P1-P2.

[0052] The present invention has the following beneficial effects:

[0053] 1. The adaptive clamping pin in this invention can adapt to the deviation in processing and manufacturing. No matter what kind of deviation it is, the adaptive clamping pin can roll, so that it can make stable contact and clamp stably regardless of the shape of the deviation.

[0054] 2. The clamping force application point of the present invention is fixed, which can adapt to the changes in the position and magnitude of the force under different working conditions.

[0055] 3. The present invention has a simple structure, low manufacturing cost, and is easy to automate, enabling mass production and commercialization.

[0056] 4. This invention can optimize and match the angles of the bearing mating surface, positioning mating surface, and clamping mating surface according to different molds, processing techniques, and load characteristics, so as to automatically find the alignment position of the mold during the mold pressing process.

[0057] 5. This invention does not require an external power source for locking. When spring clamping is used, it can achieve completely power-free clamping.

[0058] 6. During mold operation, microscopic elastic deformation occurs in the mold and its contact surfaces under load, affecting the working state of the clamping mechanism. However, this invention enables self-adjustment of the clamping state, ensuring controllable clamping force. Under bending force, the connecting block or mold body will not loosen when it deforms. Assuming a gap appears between the adaptive clamping pin and the wedge block under force, the mold clamping assembly will forcibly compress this gap; this means the clamping force is more stable and controllable, preventing jamming or locking issues.

[0059] 7. Each mold body of the present invention is clamped by a mold clamping assembly that matches it individually. The clamping force is not affected by external connecting parts, and the connection is more stable and reliable.

[0060] 8. The precision adjustment mechanism of the present invention can make fine adjustments to the manufacturing errors and wear of individual mold bodies, avoiding the need to replace or repair the entire mold set once the precision of an individual mold deviates. Attached Figure Description

[0061] Figure 1 The diagram shows a structural schematic of the bending center mold of the present invention, which has a fixed force point and adaptive locking for shape deviation.

[0062] Figure 2 The diagram shows the angles between the bearing mating surface, the positioning mating surface, and the clamping mating surface and the horizontal plane in this invention.

[0063] Figure 3 A schematic diagram of the bending center mold of the present invention with a bearing pin is shown.

[0064] Figure 4 A schematic diagram of the structure of the mold body with a support pin according to the present invention is shown.

[0065] Figure 5 The diagram shows four different ways of setting the bearing mating surface, the positioning mating surface, and the clamping mating surface in this invention; wherein, Figures (a), (b), (c), (d), and (e) correspond to schematic diagrams of setting methods one, two, three, four, and five, respectively.

[0066] Figure 6 A schematic diagram of the bending center mold with a mold limiting structure according to the present invention is shown.

[0067] Figure 7 A schematic diagram of the bending center mold with a constraint surface of the present invention is shown.

[0068] Figure 8 A schematic diagram of the bending center mold with a wedge-block clamping and guiding mechanism of the present invention is shown.

[0069] Figure 9 Showing Figure 8 A schematic diagram of a partial internal cross-section.

[0070] Figure 10 Showing Figure 8 A schematic diagram of the structure of the middle mold body.

[0071] Figure 11 Showing Figure 8 A schematic diagram of the structure of the middle wedge block.

[0072] Figure 12Showing Figure 8 A schematic diagram of the adaptive clamping pin.

[0073] Figure 13 The diagram shows the principle before the wedge block clamping guide mechanism is used for guidance.

[0074] Figure 14 The diagram shows the principle of the wedge-block clamping guide mechanism.

[0075] Figure 15 A three-dimensional schematic diagram of Embodiment 1 of the mold precision adjustment mechanism of the present invention is shown.

[0076] Figure 16 The diagram shows the structure of the mold precision adjustment mechanism of the present invention, in which the adjustment arm is located inside the mold body.

[0077] Figure 17 The diagram shows a schematic of the structure in the mold precision adjustment mechanism of the present invention, in which the adjustment arm is located outside the mold body.

[0078] Figure 18 The diagram shows a structural schematic of the present invention, in which the adjusting support arm is located outside the mold body and the mold body has a slot.

[0079] Figure 19 The diagram shows the deformation cloud map after using the mold precision adjustment mechanism of the present invention.

[0080] Figure 20 This shows a three-dimensional schematic diagram of the contact state of the contact surface in the prior art when it is uncontrollable.

[0081] Figure 21 This diagram shows a three-dimensional self-locking schematic of the bending center mold of the present invention when the bearing mating surface is horizontal.

[0082] Figure 22 A three-dimensional self-locking schematic diagram of the bearing mating surface of the bending center mold of the present invention when tilted is shown.

[0083] Figure 23 This is an illustration of the effect caused by the inability of the mold to press the sheet metal tightly, resulting in serious errors in the bending accuracy.

[0084] Among them are:

[0085] 10. Mold body;

[0086] 11. Load-bearing mating surface; 12. Positioning mating surface;

[0087] 13. Bearing surface two; 131. Bearing pin;

[0088] 14. Positioning protrusion; 141. Adaptive clamping pin groove; 15. Constraint surface;

[0089] 20. Connecting block; 21. Clamping mating surface; 22. Bearing surface one; 23. Clamping groove;

[0090] 30. Mold clamping assembly; 31. Wedge block; 32. Adaptive clamping pin; 321. Clamping pin side stop; 33. Wedge block pressing component;

[0091] 41. Horizontal limit; 42. Vertical limit;

[0092] 51. Guide block; 511. Guide pin guide groove; 512. Clamping pin guide groove; 513. Side stop sliding surface;

[0093] 52. Guide pin; 53. Vertical guide groove;

[0094] 61. Adjust the clearance; 62. Adjust the support arm; 63. Adjust the screw; 64. Adjust the sleeve. Detailed Implementation

[0095] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0096] In the description of this invention, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do 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. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of this invention.

[0097] Example 1

[0098] like Figures 1 to 2 As shown, a bending center mold with a fixed force point and adaptive locking for shape deviation includes a mold body 10, a connecting block 20, and a mold clamping assembly 30.

[0099] The connecting block has, for example Figure 3 The bearing surface 22 and clamping groove 23 are shown.

[0100] The mold body end has, for example, Figure 4 The bearing surface 13 and the positioning protrusion 14 are shown. Further, as... Figure 7 As shown, an additional constraint surface 15 is added between the bearing surface 13 and the positioning protrusion 14, which can form an over-constraint fit and is considered equivalent.

[0101] The bearing surface one and the bearing surface two are fitted together to form the bearing mating surface 11.

[0102] The positioning protrusion is inserted into the clamping groove of the connecting block and forms a positioning mating surface 12.

[0103] An arc-shaped adaptive clamping pin groove 141 is provided on the vertical wall of the mold body facing the clamping groove.

[0104] The mold clamping assembly includes a wedge block 31, an adaptive clamping pin 32, and a wedge block pressing component 33.

[0105] The adaptive clamping pin is embedded in the adaptive clamping pin groove 141 and can rotate freely. The cross-section of the adaptive clamping pin is preferably semi-circular, including an arc surface and a plane; wherein, the arc surface is embedded in the vertical wall of the mold body facing the clamping groove; the plane surface slides in contact with the wedge block to form a sliding pair.

[0106] The aforementioned semicircles can be standard semicircles, small semicircles, or large semicircles, etc., and are collectively referred to as semicircles.

[0107] The aforementioned adaptive clamping pin can compensate for various positional dimensional deviations, thereby achieving automatic locking.

[0108] The wedge block is inserted into the clamping groove on the outside of the mold body. One side of the wedge block is in contact with the adaptive clamping pin, and the other side of the wedge block forms a clamping mating surface 21 with the inner wall of the clamping groove. The included angle between the clamping mating surface and the positioning mating surface does not exceed 40°, preferably not more than 20°, so as to meet the self-locking condition.

[0109] Because different materials have different coefficients of friction, the angle between the clamping mating surface and the positioning mating surface needs to be determined according to different working conditions, such as the height of the mold, the location of the stress point, the magnitude of the bending horizontal load, and the different processing technology.

[0110] like Figure 2 As shown, the angle α1 between the bearing mating surface and the horizontal plane is preferably 120-215°; the angle α2 between the positioning mating surface and the horizontal plane is preferably 30-120°; and the angle α3 between the clamping mating surface and the horizontal plane is preferably 60-120°.

[0111] In this embodiment, as Figure 5 As shown, the angles between the bearing mating surface, the positioning mating surface, and the clamping mating surface and the horizontal plane are preferably set using any one of the following five methods:

[0112] Setting method 1: α1 = 180°, α2 = 30~120°, α3 = 60~120°.

[0113] Setting method 2: α1 = 120~215°, α2 = 90°, α3 = 60~120°.

[0114] Setting method 3: α1 = 120~215°, α2 = 30~120°, α3 = 90°.

[0115] Setting method four: α1 = 180°, α2 = 90°, α3 = 90°.

[0116] Setting method 5: α1 = 135°, α2 = 90°, α3 = 90°.

[0117] Due to manufacturing errors and inevitable wear, existing technologies such as the multi-sided bending center die in CN113751592A cannot compensate for elastic deformation caused by working loads during use, and the contact state of the contact surface is uncontrollable. Specifically, for example... Figure 20 As shown.

[0118] The above-mentioned α1 = 180°, that is, when the bearing mating surface is horizontally set, the three-dimensional diagram of its self-locking principle is as follows: Figure 21 As shown, at this point, the processing, manufacturing, and assembly are simple, and it is preferably suitable for thin plates under light loads.

[0119] The above-mentioned α1 = 135°, that is, when the bearing mating surface is inclined, the three-dimensional diagram of its self-locking principle is as follows: Figure 22 As shown, at this point, the contact surface is stable and there is no separation, but the processing and manufacturing are difficult, and it is preferably suitable for high precision and heavy loads.

[0120] The wedge clamping component is used to drive the clamping of the wedge blocks, enabling the clamping and releasing of the mold body. The wedge clamping component is a mature existing technology, such as a spring, cylinder, hydraulic cylinder, or linear electric actuator; in this embodiment, a spring or cylinder is preferred. Under the action of the upward clamping force on the lower surface of the mold body, the bending center mold will automatically find its aligned position.

[0121] During mold operation, under load, the mold and its contact surfaces undergo microscopic elastic deformation, affecting the working state of the clamping mechanism. This invention enables self-adjustment of the clamping state, ensuring controllable clamping force. Under bending force, the connecting block and mold body will not loosen when deformed. Assuming a gap appears between the adaptive clamping pin and the wedge block under force, the mold clamping assembly will forcibly compress this gap; this means the clamping force is more stable and controllable, specifically as follows... Figure 19 As shown, it can adapt to the deviations in processing and manufacturing. No matter what kind of deviation, because the adaptive clamping pin can roll, it can make stable contact and clamping regardless of the shape deviation.

[0122] Example 2

[0123] like Figure 3 and Figure 4As shown, a freely rotatable bearing pin 131 is embedded in the bearing surface two, and the contact surface between the bearing pin and the bearing surface one is a plane.

[0124] After the bearing pin 131 is installed, the plane of the bearing pin 131 will be slightly higher than the original bearing surface two, thus forming a new bearing surface two.

[0125] The biggest advantage of the bearing pin is that when there are deviations in the machining accuracy of the bearing mating surface and the positioning mating surface, the bearing pin can be rotated to achieve adaptive adjustment of the deviation.

[0126] Example 3

[0127] like Figure 6 As shown, a mold limiting structure is also provided at the end of the mold body; the mold limiting structure includes a horizontal limiting 41 and / or a vertical limiting 42; that is, the mold limiting structure may include only the horizontal limiting 41, or only the vertical limiting 42, or both the horizontal limiting 41 and the vertical limiting 42.

[0128] The aforementioned horizontal limit is horizontally positioned on the outer side of the bearing surface and extends into the connecting block to assist in horizontal clamping and limiting.

[0129] The vertical limit is set on the outside of the positioning protrusion and extends into the connecting block.

[0130] The aforementioned mold limiting structure can prevent accidental material ejection or sliding along a direction perpendicular to the mold cross-section due to impact or vibration.

[0131] Example 4

[0132] The mold clamping assembly also includes a wedge block clamping guide mechanism.

[0133] like Figure 8 and Figure 9 As shown, the wedge clamping guide mechanism includes a guide block 51, a guide pin 52, and a vertical guide groove 53.

[0134] like Figure 10 As shown, the vertical guide groove is vertically set in the positioning protrusion of the mold body.

[0135] The guide block is slidably arranged in the vertical guide groove, and the outer side of the guide block is connected to the middle of the wedge block. It is preferred to be set as a whole to form a horizontal T-shaped structure.

[0136] Preferably, both sidewalls adjacent to the wedge block and the clamping mating surface are provided with such... Figure 11 The side guard sliding surface 513 is shown.

[0137] like Figure 11 As shown, the guide block is provided with guide pin guide groove 511 and clamping pin guide groove 512.

[0138] The guide pin is horizontally inserted into the positioning protrusion and passes through the guide pin guide groove. In this embodiment, there are preferably two guide pins arranged in parallel.

[0139] The center of the adaptive clamping pin is located in the clamping pin guide groove, such as... Figure 12 As shown, the adaptive clamping pin has clamping pin side stops 321 at both ends, which can slide along the side stop sliding surface 513.

[0140] The guide pin guide groove is inclined and preferably parallel to the sliding surface of the self-adaptive clamping pin and the wedge block.

[0141] The guiding principle of the wedge block clamping and guiding mechanism for the wedge block is as follows: Figure 13 and Figure 14 As shown.

[0142] Example 5

[0143] like Figures 15 to 17 As shown, a mold precision adjustment mechanism includes a mold body, an adjustment arm 62, an adjustment screw 63, and an adjustment sleeve 64.

[0144] The mold body is preferably the mold body in the bending center mold.

[0145] The adjusting arm is located inside or outside the mold body, and one end (preferably the top end) of the adjusting arm is connected to or integrated with the mold body.

[0146] A. When the adjustable support arm is located inside the mold body, such as Figure 16 As shown, the mold body preferably has a U-shaped adjustment groove for accommodating the adjustment arm, and the outer periphery of the adjustment arm and each wall of the adjustment groove have an adjustment gap of 1mm to 5mm 61.

[0147] The adjusting screw is set horizontally, with a pitch of P1. The adjusting screw is connected to the other end of the adjusting arm via a threaded connection.

[0148] The adjusting screw sleeve has internal and external threads, with the internal thread pitch being P1 and the external thread pitch being P2. The internal thread of the adjusting screw sleeve is coaxially threaded around the outer circumference of the adjusting screw, and the external thread of the adjusting screw sleeve mates with the threaded pair of the mold body.

[0149] B. When the adjusting arm is located outside the mold body, such as Figure 17 and 18 As shown, there is a preferred vertical adjustment gap 61 of 1mm to 5mm between the adjusting arm and the mold body. Figure 18 and Figure 17 The difference lies in the additional slots on the mold body, which can also be considered equivalent to this case.

[0150] Adjust the screw to a horizontal position, adjust the screw pitch to P1, and adjust the screw to connect with the threaded pair of the mold body.

[0151] The adjusting screw sleeve has internal and external threads, with the internal thread pitch being P1 and the external thread pitch being P2; the internal thread of the adjusting screw sleeve is coaxially threaded around the outer circumference of the adjusting screw, and the external thread of the adjusting screw sleeve mates with the threaded pair of the adjusting support arm.

[0152] Whether the adjusting arm is located inside or outside the mold body, the mold body can be precisely adjusted by rotating the adjusting sleeve. For each revolution of the adjusting sleeve, the mold body can achieve a horizontal adjustment distance Δ, where Δ = P1 - P2. In other words, fine adjustment can be achieved through optimized matching of P1 and P2. The deformation cloud diagram for precision adjustment is shown below. Figure 19 As shown in the figure, all values ​​are in mm, and the adjustment effect is obvious.

[0153] The mold precision fine-tuning allows for adjustments to deviations. This embodiment offers convenient adjustments and enables minute adjustments at the micrometer level. An internal force is applied to the mold body via an adjustment mechanism, causing a slight elastic deformation, thereby achieving fine-tuning of the precision.

[0154] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A bending center mold with a fixed force point and adaptive locking for shape deviation, characterized in that: Includes the mold body, connecting block, and mold clamping assembly; The connecting block has a bearing surface and a clamping groove; The mold body has a bearing surface two and a positioning protrusion at its end; wherein, the bearing surface one and the bearing surface two cooperate to form a bearing mating surface; the positioning protrusion is inserted into the clamping groove of the connecting block and forms a positioning mating surface; The mold clamping assembly includes an adaptive clamping pin, a wedge block, and a wedge block clamping component; The adaptive clamping pin is embedded in the vertical wall of the mold body facing the clamping groove and can rotate freely; The wedge block is inserted into the clamping groove on the outside of the mold body. One side of the wedge block is in contact with the adaptive clamping pin, and the other side of the wedge block forms a clamping mating surface with the inner wall of the clamping groove. The angle between the clamping mating surface and the positioning mating surface does not exceed 40°. The wedge clamping component is used to drive the clamping of the wedge block.

2. The bending center mold with fixed force points and adaptive locking for shape deviation as described in claim 1, characterized in that: The angle α1 between the bearing mating surface and the horizontal plane is 120~215°; the angle α2 between the positioning mating surface and the horizontal plane is 30~120°; and the angle α3 between the clamping mating surface and the horizontal plane is 60~120°.

3. The bending center mold with fixed force points and adaptive locking for shape deviation as described in claim 2, characterized in that: The angles between the bearing mating surface, the positioning mating surface, and the clamping mating surface and the horizontal plane can be set using any one of the following five methods: Setting method 1: α1=180°, α2=30~120°, α3=60~120°; Setting method 2: α1=120~215°, α2=90°, α3=60~120°; Setting method 3: α1=120~215°, α2=30~120°, α3=90°; Setting method four: α1=180°, α2=90°, α3=90°; Setting method 5: α1=135°, α2=90°, α3=90°.

4. The bending center mold with fixed force points and adaptive locking for shape deviation as described in claim 1, characterized in that: The cross-section of the adaptive clamping pin is semi-circular, including an arc surface and a plane; wherein, the arc surface is embedded in the vertical wall of the mold body facing the clamping groove and can rotate; the plane slides in contact with the wedge block; the semi-circular shape can be a semi-circle, a small semi-circle, or a large semi-circle.

5. The bending center mold with fixed force points and adaptive locking for shape deviation as described in claim 1, characterized in that: A freely rotatable bearing pin is embedded in the bearing surface two, and the contact surface between the bearing pin and the bearing surface one is a plane.

6. The bending center mold with fixed force points and adaptive locking for shape deviation as described in claim 1, characterized in that: The wedge clamping components are springs, cylinders, hydraulic cylinders, or linear electric push rods.

7. The bending center mold with fixed force points and adaptive locking for shape deviation as described in claim 1, characterized in that: The mold body is also provided with a mold limiting structure at its end; the mold limiting structure includes a horizontal limit and / or a vertical limit; the horizontal limit is horizontally set on the outer side of the bearing surface and extends into the connecting block; the vertical limit is vertically set on the outer side of the positioning protrusion and extends into the connecting block.

8. The bending center mold with fixed force points and adaptive locking for shape deviation as described in claim 1, characterized in that: The mold clamping assembly also includes a wedge block clamping and guiding mechanism; The wedge clamping guide mechanism includes a guide block, a guide pin, and a vertical guide groove; The vertical guide groove is vertically set in the positioning protrusion of the mold body; The guide block is slidably arranged in the vertical guide groove, and the outer side of the guide block is connected to or integrated with the middle of the wedge block; The guide block is provided with guide pin guide groove and clamping pin guide groove; The guide pin is horizontally inserted into the positioning protrusion, passes through the guide pin guide groove, and is adapted to the guide pin guide groove; The middle part of the adaptive clamping pin is located in the clamping pin guide groove, and both ends of the adaptive clamping pin have clamping pin side stops.

9. The bending center mold with fixed force points and adaptive locking for shape deviation as described in claim 8, characterized in that: There are two guide pins, arranged in parallel; the guide pin guide grooves are arranged at an angle.

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