A progressive profile space free bending device

Abstract

The application discloses a progressive profile space free bending device and relates to the technical field of pipe bending machines. The progressive profile space free bending device comprises a rack, a propelling mechanism, a pressing mechanism, an elbow mechanism and an elbow movement control mechanism. The propelling mechanism comprises a profile clamp and a clamp movement transmission mechanism, the pressing mechanism comprises a pressing die, a rotating bearing and a bearing seat, the elbow mechanism comprises a bending die and a transmission gear, and the elbow movement control mechanism comprises a control mechanism for realizing axial movement of the elbow mechanism and a control mechanism for realizing horizontal translation and rotation of the whole elbow mechanism. The processing principle is three-axis space bending processing. The application is applied to profile space variable-curvature bending and solves the problems of high cost and poor universality in the traditional profile space bending process. The application provides a continuous deformation and precision-controllable space pipe bending machine for profile bending processing and fills the gap of the equipment in the market.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe bending machines, in particular to a profile space bending forming method. BACKGROUND

[0002] At present, profile bending forming technology is one of the indispensable processing methods in the manufacturing industry and is widely used in the fields of aerospace, high-speed rail, automobile, ship, etc. The bent profile has the advantages of light weight, good toughness and high strength, and is suitable for equipment that needs lightweight and high load conditions, such as rail transit vehicles, aerospace equipment, automobile and ship skeletons, and home decoration fields.

[0003] The traditional profile bending forming method cannot cope with continuous complex bending and cannot meet the complex requirements in space. The traditional stretch-bend process has the disadvantages of low efficiency and dependence on molds, and cannot meet the requirements of space bending. At present, in the field of profile processing, the space free bending technology is not mature. Unlike pipe materials, profile bending processing requires high-precision and high-universal molds to adapt to space bending.

[0004] In summary, there is an urgent need for a gradual profile space free bending device to meet the needs. The device can split and integrate the profile bending process through the cooperation of multiple groups of motion mechanisms, combining the advantages of traditional profile bending and proposing a new profile bending method. This forming process is simple and efficient, and can correct the errors and damage of the processed profile within a controllable range, while adjusting the mold size according to the size of the profile to reduce production costs. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings and deficiencies in the prior art, and to provide a profile space bending forming method. The bending forming method has strong universality, can reduce the dependence of the device on traditional bending molds, can not only improve the efficiency of profile bending processing, but also greatly reduce the cost of profile bending processing, and is beneficial to use and popularize in the profile bending industry.

[0006] In order to achieve the above purpose, the present application is realized by the following technical scheme:

[0007] A gradual profile space free bending device, comprising a rack, a profile fixing frame, a pushing mechanism, a pressing mechanism, a bend mechanism and a bend motion control mechanism, characterized in that:

[0008] The frame is fixed to the ground, ensuring that the whole bending machine processing environment is stable, and the stress is uniform; the profile fixing frame is connected with the frame and the elbow motion control mechanism and helps to improve the stability and safety of the whole device; the linear guide rail is directly connected with the frame through bolts, ensuring the stability and accuracy of the whole pushing mechanism and elbow mechanism during movement; the sliding block is arranged below the pushing mechanism and is connected with the guide rail fixed on the surface of the frame, ensuring the stability of the mechanism and the whole device during low-speed pushing and feeding; the pressing mechanism is directly fixed on the frame, ensuring that the processed profile does not displace or vibrate during processing, and avoiding the surface of the workpiece from being pressed or deformed; the elbow mechanism is directly connected with the elbow motion control mechanism through the connecting shaft and the sliding block sliding rail mechanism; the elbow motion control mechanism uses the motor as a power output source to realize the horizontal translation and rotation of the elbow structure as a whole.

[0009] The pushing mechanism comprises a rotatable profile clamp, a transmission mechanism for clamp movement, a matching speed reducer, and a mechanism chassis. The rotatable profile clamp can be replaced with different clamping dies according to the size of the profile, ensuring that it closely fits the profile during processing. The transmission mechanism for clamp movement and the matching speed reducer comprise a rotating mechanism and a translating mechanism. The rotating mechanism is driven by a belt, with the input end connected to the speed reducer and the output end connected to the profile clamp. The profile clamp and the rotating mechanism are fixed on the mechanism chassis. The translating mechanism is driven by a ball screw, which improves the cost performance of the mechanism while ensuring accuracy. The mechanism chassis is provided with a sliding block and a nut, which are connected with the linear guide rail and the screw on the frame, respectively.

[0010] The pressing mechanism comprises a pressing die, a rotating bearing, and a bearing seat. The pressing die is a cylindrical structure with an opening matching the size of the profile cross section. The cylindrical pressing die is provided with a bearing. The bearing seat is fixedly connected with the machine tool to improve the overall strength of the pressing mechanism.

[0011] The elbow mechanism comprises a bending die, a transmission gear, a driving gear, a flange plate, a connecting shaft, a support steel plate, and a speed reducer. The bending die is a cylindrical structure with an opening matching the size of the profile cross section. The transmission gear is sleeved on the outer ring of the bending die and engaged with the driving gear and the speed reducer, which are directly connected to the side surface of the support steel plate. The flange plate is fixed on the support steel plate by bolts and directly connected with the motor shaft during the horizontal movement of the elbow mechanism, avoiding equipment failure. The speed reducer is fixed on the side surface of the support steel plate and directly connected with the driving gear through the motor shaft, providing power input for the axial movement of the bending die.

[0012] The elbow motion control mechanism includes a slider transverse translation control mechanism, a transverse rotation control mechanism slide rail mechanism, a support plate and a rolling bearing. The transverse translation control mechanism includes a speed reducer, a ball screw mechanism and a transverse movement mold slider. The speed reducer is directly connected with the ball screw and fixed at the front end of the rack. The transverse movement mold slider is connected with the support plate and controls the transverse movement of the entire elbow motion control mechanism during the relative movement with the ball screw. The transverse rotation control mechanism slide rail mechanism includes a speed reducer and a coupling. The speed reducer and the coupling are directly connected and fixed above the support plate and connected with the elbow mechanism through a connecting shaft. The rolling bearing is located on the lower side of the support plate, which helps to improve the stress condition and increase the strength of the elbow mechanism during the axial movement.

[0013] The feeding transmission mode of the pushing mechanism is ball screw transmission. The power input end is connected with the ball screw through the speed reducer and the coupling. The corresponding position is selected according to the size of the rack. The feeding movement of the pushing mechanism ensures the stable operation during the screw transmission and reduces the failure probability.

[0014] Further, the spatial bending process is decomposed into multiple stages. Since the elbow mechanism is only a three-axis motion, a single bending process can only complete a specific angle of processing, so the bending die and the profile clamp must be controlled simultaneously to complete the axial rotation and rotate the processing plane to the required angle. Before processing, the profile to be processed needs to be analyzed for bending path and the corresponding processing flow is designed. The spatial bending process is decomposed into multiple single bending processes by adopting the step-by-step idea, so as to realize the spatial bending of the profile.

[0015] Further, the cross section of the processed profile, the cross section of the clamp of the pushing mechanism, the cross section of the pressing die of the pressing mechanism and the cross section of the bending die of the elbow mechanism should be kept on the same horizontal line. The profile clamp cooperates with the profile to be processed, and cooperates with the pressing die and the bending die in turn along the feeding direction and is tightly attached to ensure close cooperation during processing.

[0016] Further, the process flow of the spatial bending includes: designing the bending modeling in advance; selecting the matched die which closely cooperates with the profile to be processed; designing the path according to the requirements, decomposing the spatial bending process into multiple two-dimensional bending, controlling the curvature of single bending by the transverse rotation of the bending die and the movement mechanism, and realizing the parameter control through the control of the relative position between the pressing die; during each two-dimensional bending process, the axial rotation mechanism of the bending die and the profile clamp rotation mechanism realize the rotation of the processing plane, so as to control the parameters of the spatial bending process by the rotation angle and direction.

[0017] In the above scheme, the method of the present application adopts a guided profile processing method to change sliding friction into rolling friction to reduce the loss and wrinkling problems in the profile processing process. At the same time, the forming principle of the present device is clear and simple, the construction and debugging process of the device is simple, the forming result is accurate, and the bending process is efficient and accurate. These advantages make the present application more practical and have practical application value.

[0018] The profile space bending forming method adopted by the present application has strong universality, which can not only be applied to profiles of different sizes and rectangular cross sections, but also can improve the efficiency of profile bending processing and greatly reduce the production cost. Due to its superior performance, the technology can be widely applied and popularized in the profile bending industry, and has good market prospect and economic benefit. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the overall composition schematic diagram of the progressive profile space free bending device of the present application;

[0020] Figure 2 is the composition schematic diagram of the pushing mechanism;

[0021] Figure 3 is the composition schematic diagram of the pressing mechanism;

[0022] Figure 4 is the composition schematic diagram of the elbow mechanism;

[0023] Figure 5 is the composition schematic diagram of the elbow motion control mechanism;

[0024] In the figure: rack 1; pushing mechanism 2; rotatable profile clamp 2-1; speed reducer 2-2; belt transmission mechanism 2-3; ball screw 2-4; linear guide rail 2-5; pressing mechanism 3; pressing die 3-1; bearing seat 3-2; elbow mechanism 4; bending die 4-1; transmission gear 4-2; driving gear 4-3; support steel plate 4-4; speed reducer 4-5; elbow motion control mechanism 5; speed reducer 5-1; ball screw 5-2; slider rail mechanism 5-3; support plate 5-4; transverse movement die slider 5-5; rolling bearing 5-6; profile fixing frame 6. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and advantages to be solved by the present application more clear, the following will be described in detail and completely in combination with the drawings and specific embodiments.

[0026] The present application provides a progressive profile space free bending device, which comprises a rack 1, a pushing mechanism 2, a pressing mechanism 3, an elbow mechanism 4, an elbow motion control mechanism 5 and a profile fixing frame 6, wherein:

[0027] The rack 1 is fixed to the ground to keep the whole processing stable, the linear guide rails 2-5 are fixed to the rack 1 by screwing, the nut and the sliding block are arranged below the pushing mechanism 2 and are connected to the linear guide rails 2-5 and the ball screw 2-4 respectively, the speed reducer 2-2 is connected to the ball screw 2-4 as a power input source, the rotary motion of the rotatable profile clamp 2-1 is realized by the belt transmission mechanism 2-3, and the power input source is also the speed reducer 2-2.

[0028] The bearing seat 3-2 is fixed to the rack 1, the bending die 3-1 is arranged in the center, and the bearing seat 3-2 and the rack 1 are connected by long holes and bolts to adjust the relative positions of the pressing mechanism 3 and the elbow mechanism 4.

[0029] The elbow mechanism 4 is arranged on the front side of the rack 1 without interfering with the processing, the bending die 4-1 is provided with an external bearing to ensure that the bending die 4-1 can rotate freely in the axial direction, the transmission gear 4-2 is arranged outside the bending die 4-1, the other driving gear 4-3 is directly connected to the output shaft of the speed reducer 4-5 and is arranged on the side of the support steel plate 4-4, the upper end of the support steel plate 4-4 is directly connected to the motor shaft of the speed reducer 5-1 through the support plate 5-4 of the elbow motion control mechanism 5 to realize the overall lateral rotation of the elbow mechanism 4, the other group of speed reducers 5-1 are fixed to the rack 1 together with the ball screw 5-2, the lateral movement of the support plate 5-4 is realized by the lateral movement of the die sliding block 5-5, and the sliding block sliding rail mechanism 5-3 plays a role in stable operation and maintaining stability in the equipment, the sliding rail is fixed to the rack 1 by screwing, the sliding rail is fixed to the support plate 5-4 by screwing, and the rolling bearing 5-6 is connected to the lower end of the elbow mechanism 4 through the connecting shaft.

[0030] In summary, during the assembly of the equipment, the three processing planes of the profile clamp 2-1, the pressing die 3-1 and the bending die 4-1 are kept in the same horizontal plane as the first step of the processing process, which can greatly reduce the processing error of the profile space three-dimensional pipe bending machine in the processing process.

[0031] According to the size of the cross section of the rectangular section profile to be processed, the size of the required clamp and die is calculated; the equipment is placed in the starting position, the profile to be processed is placed in the profile clamp 2-1, the stable feeding during the process is ensured, the front section of the profile passes through the center opening of the pressing die 3-1, the surfaces of the profile are tightly connected with the die, the cross section distortion during the processing is avoided, when the profile passes through the center opening of the bending die 4-1, the whole bending mechanism 4 is moved through the motion control, in the single bending process, the bending die 4-1 only needs to complete the horizontal movement and rotation cooperation, the stress position of the profile is changed by changing the position of the bending die 4-1, and the guided processing is completed by using the supporting reaction force; in the multiple continuous bending process, the bending die 4-1 needs to ensure the stable realization in the single bending process, and also needs to ensure that the axial rotation movement of the bending die 4-1 is synchronous with the profile clamp 2-1 during the rotation process in the processing plane, so that the processing error caused by the time sequence problem is avoided.

[0032] After the above steps are completed, the processed profile is taken down, the feeding mechanism 2 and the bending mechanism 4 are reset, and the next processing is prepared.

[0033] Specifically, in order to ensure that the equipment has balanced stress and high torsional resistance, the equipment provided by the present application adopts a pair or more of force-bearing workpieces in multiple mechanisms, and the positioning sizes are mutually referenced. Multiple independent mechanisms must be precisely controlled to realize synchronous operation to ensure that process problems do not affect the processing accuracy. At the same time, the stress of the equipment is ensured to be far less than the manufacturing accuracy of the processing part after simulation. These measures together ensure the reliability, stability and processing accuracy of the equipment.

[0034] The profile three-dimensional bending forming method has strong universality, can be applied to profiles of different sizes and rectangular cross sections, can improve the efficiency of profile bending processing, and can greatly reduce the production cost. The successful implementation of this technology will have important significance for the development of the profile bending industry, and will help to promote the further development and application of the industry.

[0035] The above embodiment is a preferred embodiment of the present application, but the implementation of the present application is not limited to the above embodiment. Without departing from the spirit and principles of the present application, changes, modifications, substitutions, combinations or simplifications of the present application are regarded as equivalent replacement methods, and these operations are all included in the protection scope of the present application.

Claims

1. A progressive profile space free bending device, comprising a rack, a profile fixing frame, a pushing mechanism, a pressing mechanism, a bending head mechanism and a bending head motion control mechanism, characterized in that: the rack is fixed to the ground to ensure that the bending machine as a whole processes in a stable environment and is uniformly stressed; the profile fixing frame is connected with the rack and the bending head motion control mechanism and helps to improve the overall stability and safety of the device; the pushing mechanism is provided with a sliding block connected with a linear guide rail fixed on the surface of the rack to ensure the stability during low-speed feeding; the pressing mechanism is fixed on the rack and always adheres to the surface of the profile to be processed during processing to ensure the forming quality; the bending head mechanism is directly connected with the bending head motion control mechanism through a connecting shaft and a sliding block sliding rail mechanism; the bending head motion control mechanism uses a motor as a power output source to realize the horizontal translation and rotation of the bending head structure as a whole; the space bending pipe is completed by decomposing the space bending process into multiple stages, designing the bending process and technology scheme in advance, and controlling the motion of the bending head mechanism, the bending head motion control mechanism and the profile clamp. the bending head motion control mechanism comprises a sliding block horizontal translation control mechanism, a horizontal rotation control mechanism, a sliding block sliding rail mechanism, a support plate and a rolling bearing; the horizontal translation control mechanism comprises a speed reducer, a ball screw mechanism and a horizontal movement mold sliding block, the speed reducer is directly connected with the ball screw and fixed at the front end of the rack; the horizontal movement mold sliding block is connected with the support plate and controls the horizontal motion of the whole bending head motion control mechanism during the relative motion with the ball screw; the horizontal rotation control mechanism comprises a speed reducer and a coupling, the speed reducer and the coupling are directly connected and fixed above the support plate and connected with the bending head mechanism through a connecting shaft; the rolling bearing is located on the lower side of the support plate to help improve the stress condition and increase the strength of the bending head mechanism during axial motion.

2. The apparatus for free spatial bending of a progressive profile according to claim 1, characterized in that: the pushing mechanism comprises a rotatable profile clamp, a clamp motion transmission mechanism and a mechanism chassis; the rotatable profile clamp can be replaced with different clamping molds according to different profile sizes; the clamp motion transmission mechanism and the matching speed reducer comprise a rotation mechanism and a translation mechanism, the transmission mode of the rotation mechanism is belt transmission, the input end is connected with the speed reducer, and the output end is connected with the profile clamp, the profile clamp and the rotation mechanism are fixed on the mechanism chassis as a whole, and the transmission mode of the translation mechanism is ball screw transmission; the mechanism chassis is provided with a sliding block and a nut which are connected with the linear guide rail and the ball screw respectively.

3. The apparatus according to claim 1, wherein: the pressing mechanism comprises a pressing mold, a rotating bearing and a bearing seat, the pressing mold is a cylindrical structure, an opening with a size matching the cross-sectional size of the profile is arranged in the cylindrical structure, a bearing is arranged on the outer sleeve of the cylindrical structure, the bearing seat is fixedly connected with the machine tool to improve the overall strength of the pressing mechanism.

4. The apparatus for free spatial bending of a progressive profile according to claim 3, characterised in that: The elbow mechanism comprises a bending die, a transmission gear, a driving gear, a flange plate, a connecting shaft, a support steel plate and a speed reducer; the bending die is in a cylindrical structure, and is internally provided with an opening with a corresponding size matching the sectional size of the profile; the bending die is sleeved with the transmission gear and cooperates with a bearing, and the driving gear engaged with the transmission gear is directly connected with the speed reducer; the flange plate is fixed on the support steel plate by bolts, and is directly connected with the motor shaft during the transverse movement of the elbow mechanism, so as to avoid equipment failure; the speed reducer is fixed on the side surface of the support steel plate and is directly connected with the driving gear through the motor shaft, so as to provide power input for the axial movement of the bending die.

5. The apparatus according to claim 1, wherein: The sectional size of the profile to be processed, the sectional size of the clamp of the pushing mechanism, the sectional size of the pressing die of the pressing mechanism and the sectional size of the bending die of the elbow mechanism should be kept on the same horizontal line.

6. The apparatus for free spatial bending of a progressive profile according to claim 4, characterised in that: The profile to be processed should be firstly matched with the profile clamp, and then sequentially matched with the pressing die and the bending die along the feeding direction, so as to ensure close cooperation during the processing, and avoid negative problems in the bending process.

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