A quick die change system for FET1200 skin forming machine

Abstract

The invention discloses a mold rapid replacement system for a FET1200 skin stretching machine, which relates to the technical field of aircraft skin manufacturing, and comprises a mold replacement track device and two mobile workbenches, both of which are movably arranged on the mold replacement track; the mold replacement track device comprises a working area track device and two preparation area track devices, and the two preparation area track devices are respectively connected to the two ends of the working area track device; the working area track device and the mobile workbench are both in a "W" shape when viewed from above, and the "W"-shaped notches of the working area track device and the mobile workbench are matched in size. The mold rapid replacement system has a high degree of automation, and mold replacement is quick and convenient, and it is easier to ensure the processing accuracy of skin parts.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft skin manufacturing, in particular to a mold rapid replacement system of a FET1200 type skin stretching machine. Background Art

[0002] Aircraft skin refers to a dimensional component that surrounds the aircraft frame structure and is fixed to the frame with adhesives or rivets to form the aircraft's aerodynamic shape. When making aircraft skin, skin parts are usually made according to the contours of the various parts of the aircraft frame structure, and then riveted to the aircraft frame to form a complete component. Therefore, the appearance of skin parts is complex, the product variety is large, and the production batch is small.

[0003] At present, the stretch forming process is usually used to make aircraft skin parts. The FET1200 skin stretching machine produced by the French ACB company is a device used for transverse stretching of skin parts. It mainly includes a frame, a pad, a mobile gantry device and two sets of stretching devices. The stretching device is arranged on both sides of the pad, and includes hydraulic jaws, two horizontal cylinders and two vertical cylinders. The hydraulic jaws can move with multiple degrees of freedom under the drive of the two horizontal cylinders and two vertical cylinders. The mold is padded on the top of the frame through the pad, and the two sets of stretching devices are arranged on both sides of the mold. When in use, the mold matching the skin part to be processed is installed on the pad, and the blank is placed on the mold, and its two sides are clamped by the hydraulic jaws. Driven by the above-mentioned cylinders, the two hydraulic jaws clamp the two ends of the blank and stretch it with the mold as the reference until the production of the skin part is completed.

[0004] However, due to the complex appearance, many product types and small production batches of the above-mentioned aircraft skin parts, the mold needs to be replaced frequently during the actual production process. In the prior art, the mold replacement work of the skin forming machine is mainly carried out by using the bridge crane in the production workshop to transport the mold, and then manually installing and aligning it. The mold replacement work is carried out in the working area of ​​the skin forming machine. When the mold is replaced, the skin forming machine is in a state of waiting and cannot perform the forming operation, which leads to the low working efficiency of the skin forming machine, and its production capacity can no longer meet the needs of the rapid development of my country's aviation industry.

[0005] In addition, when the stretch forming process is used to make skin parts, it mainly includes the processes of initial drawing, quenching treatment, final drawing (supplementary drawing), etc. Since the skin parts will produce quenching residual stress during the quenching process, which affects the processing quality of the skin parts, in actual production, the skin parts must be supplemented within a specified time after quenching (generally 2 hours) to eliminate the quenching residual stress. The mold replacement method in the prior art, its replacement speed and replacement quality are usually determined by the experience of the operator. It is difficult to ensure that after the mold is changed in the middle, the mold is in the same position during the initial drawing and final drawing. At the same time, it is also difficult to ensure that the mold replacement is completed within the specified time, which will affect the processing quality of the skin parts. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a mold quick-change system for a FET1200 skin stretching machine, which has a high degree of automation, is quick and convenient to change molds, and is easier to ensure the processing accuracy of skin parts.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] A mold quick-change system for a FET1200 skin stretching machine, comprising a mold change track device and two movable workbenches, wherein both movable workbenches are movably arranged on the mold change track device;

[0009] The mold replacement track device comprises a working area track device and two preparation area track devices, and the two preparation area track devices are respectively connected to two ends of the working area track device;

[0010] The working area track device and the movable working platform are both in a "W" shape when viewed from above, and the sizes of the "W"-shaped notches of the working area track device and the movable working platform are adapted to each other.

[0011] Further, the preparation area track device includes a central track a and side tracks a arranged in parallel on both sides of the central track a, and the working area track device includes a central track b and side tracks b arranged in parallel on both sides of the central track b, the two ends of the central track b are respectively connected to the two central tracks a, and the two ends of the side tracks b are respectively connected to the two side tracks a located on the same side of the two preparation area track devices;

[0012] The side track b is a segmented track, and the segmented positions of the side track b correspond to the positions of the Chinese character “W”-shaped notches of the working area track device.

[0013] Further, the mobile workbench includes a platform body in a king-shaped structure. At the central position of the bottom of the platform body, a number of active wheel devices and a number of driven wheels are provided. The driven wheels are adapted to both the central track a and the central track b.

[0014] The active wheel device includes a reduction motor with a double output shaft. Both output shafts of the reduction motor are fixedly connected with universal couplings. The other end of the universal coupling is fixedly connected with an active wheel. The active wheel is adapted to both the side track a and the side track b.

[0015] Further, four groups of the active wheel devices are provided, and two driven wheels are provided.

[0016] Further, both the central track b and the side track b include a number of liftable track sections. A number of lifting hydraulic cylinders are fixedly arranged on the working area track device. The end of the piston rod of the lifting hydraulic cylinder is fixedly connected with the bottom of the track section. The lifting hydraulic cylinder is used to drive the track section to lift.

[0017] Further, a fixed gantry mechanism is further included. The fixed gantry mechanism includes four support columns and a slider device. The slider device is arranged directly above the working area track device. The four support columns are respectively fixedly arranged around the outside of the working area track device. The support columns are used to support the slider device.

[0018] Further, retractable cover plates are arranged at each notch of the king-shaped structure of the working area track device.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The die quick change system of the FET1200 type skin stretch forming machine is provided with a change track device and two mobile workbenches. The change track device includes a working area track device and two preparation area track devices. When one mobile workbench is performing skin stretch forming operation on the working area track device, the other mobile workbench can synchronously perform die change work on the preparation area track device. When the skin stretch forming operation is completed, only by switching the positions of the two mobile workbenches can the die change work be completed. Compared with the traditional die change method, the downtime waiting time of the skin stretch forming machine is reduced, and the working efficiency of skin stretch forming production is significantly improved.

[0021] 2. The above-mentioned mobile workbench adopts a king-shaped structural design method to solve the movement interference problem between the mobile workbench and the vertical cylinder of the stretch forming machine; four groups of active wheels and two driven wheels are provided to avoid the vehicle body imbalance caused by the wheels being suspended, making the movement of the mobile workbench more stable.

[0022] 3. The above-mentioned work area track device is provided with a number of escalable track segments, each of which corresponds to each wheel of the mobile work platform, and is driven up and down by a lifting hydraulic cylinder. When the track segment is raised, its top surface is flush with the top surface of the track, allowing the mobile work platform to move normally; when the track segment is lowered, it can drive the wheels of the mobile work platform to lower together, and the platform body of the mobile work platform is in contact with the work area track device as a whole, and the load bearing is more stable, eliminating potential safety hazards in the skinning work.

[0023] 4. The traditional mobile gantry mechanism is transformed into a four-point fixed gantry mechanism, which not only solves the problem of motion interference between the mobile workbench and the mobile gantry mechanism, but also improves the work efficiency and processing accuracy of the skin stretching work. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a mold rapid replacement system of a FET1200 type skin stretching machine of the present invention;

[0025] Figure 2 A schematic diagram of the structure of the track device for changing the mold;

[0026] Figure 3 It is a structural schematic diagram of the working area track device;

[0027] Figure 4 It is a structural schematic diagram of the bottom of the mobile workbench;

[0028] Figure 5 It is a structural schematic diagram of a FET1200 skin stretching machine in the prior art;

[0029] Figure 6 The present invention is a diagram showing the use status of a mold quick-change system of a FET1200 skin stretching machine when used in the skin stretching machine. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0031] like Figure 5As shown in the figure, in the prior art, the FET1200 skin stretch forming machine mainly includes a frame, a cushion block 55, a moving gantry device 54, and two sets of stretching devices 5. The above two sets of stretching devices 5 are arranged on both sides of the cushion block, and each includes a hydraulic jaw 53, two horizontal cylinders 51, and two vertical cylinders 52. The two horizontal cylinders 51 are arranged on the top plane of the frame. One end of the cylinder barrel is hinged to the frame, and one end of the piston rod is hinged to the hydraulic jaw 53. The two vertical cylinders 52 are approximately vertically arranged with respect to the horizontal cylinders 51. The piston rod of the vertical cylinder 52 passes through the frame, and the end of the piston rod is hinged to the hydraulic jaw 53. Driven by the two horizontal cylinders 51 and the two vertical cylinders 52, the hydraulic jaw 53 can move in multiple degrees of freedom. When manufacturing an aircraft skin part, the mold is placed above the frame through the cushion block 55, and the two sets of stretching devices 5 are respectively arranged on both sides of the mold. During use, a mold matching the skin part to be processed is installed on the cushion block 55, the blank is placed on the mold, and both sides of the blank are clamped by the hydraulic jaws 53. Driven by the above cylinders, the two hydraulic jaws 53 hold both ends of the blank and stretch it with the mold as a reference until the production of the skin part is completed. Due to the complex shape, variety of products, and small production batch of aircraft skin parts, the mold needs to be frequently replaced during actual production. The mold replacement work of the above skin stretch forming machine mainly uses a bridge crane in the production workshop to transport the mold, and then installs and aligns it manually. This mold replacement work is carried out in the working area of the skin stretch forming machine. When replacing the mold, the skin stretch forming machine is in a state of waiting for shutdown and cannot perform stretch forming operations, which results in low working efficiency of the skin stretch forming machine. For this mold replacement method, its replacement speed and quality are usually determined by the experience of the operator, and it is difficult to ensure accurate and rapid mold replacement, and even affect the processing quality of the skin parts.

[0032] For the above reasons, the present invention provides a mold rapid replacement system for the FET1200 skin stretch forming machine, and its structure is as Figures 1 to 4 shown, including a mold replacement track device and two moving workbenches 1. The two moving workbenches 1 are movably arranged on the mold replacement track device. The mold replacement track device includes a working area track device 2 and two preparation area track devices 3. The two preparation area track devices 3 are respectively connected to both ends of the working area track device 2. The working area track device 2 and the moving workbench 1 are both in a king shape when viewed from above, and the king-shaped notch sizes of the working area track device 2 and the moving workbench 1 are adapted to each other.

[0033] During implementation, this mold rapid replacement system is used in the FET1200 skin stretch forming machine, and its installation structure is as Figure 6As shown, the working area track device 2 is fixedly arranged between the two stretching devices 5 of the skin stretching machine, and the positions of each Wang-shaped notch of the working area track device 2 correspond to the positions of the four vertical cylinders 52. When the skinning operation is performed, the vertical cylinder 52 will swing around the center of the earring at its tail. Through the above arrangement, a swing area is formed in each of the above-mentioned notches, allowing the vertical cylinder to swing therein without interference. Further, a retractable cover plate 20 is provided at each Wang-shaped notch of the working area track device 2. The cover plate 20 is a structure in which multiple layers of narrow plates are slidably connected in sequence. One end of the cover plate 20 is fixedly arranged, and the other end is connected to the vertical cylinder 52. It is retracted and retracted with the swing of the vertical cylinder 52, and can effectively cover the necessary position of the notch to prevent tools, parts, etc. from falling from the notch.

[0034] The above-mentioned entire mold replacement track device is arranged perpendicular to the horizontal cylinder 51 of the skin stretching machine. When in use, one mobile workbench 1 moves to the working area track device 2 to perform the stretching operation of the skin parts; the other mobile workbench 1 stays on one of the preparation area track devices 3 to synchronously perform the replacement work of the pads and molds. Through the position conversion of the two mobile workbenches 1, the two mobile workbenches 1 can alternately enter the working area track device 2, realizing the simultaneous operation of the double stations, that is, the mold replacement work for the next stretching is synchronously performed while the skin stretching operation is being performed. When the current stretching operation is completed, the mold replacement required for the next stretching has been completed, and the stretching work can be quickly performed by moving the mobile workbench 1, eliminating the downtime waiting time of the skin stretching machine. The mold replacement speed is fast, which greatly improves the working efficiency of the skin stretching machine and is also beneficial to ensure the processing quality of the skin parts.

[0035] The above-mentioned preparation area track device 3 includes a central track a31 and side tracks a32 arranged in parallel on both sides of the central track a31. The working area track device 2 includes a central track b21 and side tracks b22 arranged in parallel on both sides of the central track b21. The two ends of the central track b21 are respectively connected to two central tracks a31, and the two ends of the side tracks b22 are respectively connected to two side tracks a32 on the same side of the two preparation area track devices 3. The side track b22 is a segmented track, and the segmented position of the side track b22 corresponds to the position of the king-shaped notch of the working area track device 2. This segmented position of the side track b22 is also used to avoid interference with the vertical oil cylinder 52. The moving workbench 1 includes a platform body 11 with a king-shaped structure. At the central position of the bottom of the platform body 11, a number of active wheel devices and a number of driven wheels 12 are provided. The driven wheels 12 are adapted to both the central track a31 and the central track b21. The active wheel device includes a reduction motor 13 with a double output shaft. Both output shafts of the reduction motor 13 are fixedly connected with universal couplings 14. The other end of the universal coupling 14 is fixedly connected with an active wheel 15. The active wheel 15 is adapted to both the side track a32 and the side track b22. Driven by the reduction motor 13, its output shafts drive the two universal couplings 14 to rotate, further driving the active wheels 15 to rotate, so as to realize the reciprocating movement of the moving workbench 1 on the working area track device 2 and the preparation area track device 3, and further complete the process of converting the two moving workbenches 1, so as to achieve the purpose of quickly replacing the mold. Setting the driven wheels 12 to roll on the central track a31 and the central track b21 can effectively avoid the overall imbalance of the workbench when the active wheels 15 are suspended when passing through the segmented position of the above-mentioned side track b22 during the conversion process of the moving workbench 1 on the working area track device 2 and the preparation area track device 3. In specific implementation, four groups of active wheel devices are provided, and two driven wheels 12 are provided. The overall mold replacement track device can be understood as including three parallel guide rails. Among these three guide rails, the central guide rail is continuous, and the two driven wheels 12 run on the central guide rail; the guide rails on both sides are disconnected to avoid interference with the vertical oil cylinder 52, and the two active wheels 15 of each group of active wheel devices respectively run on the guide rails on both sides. In this specific setting, when an active wheel 15 is suspended, the above-mentioned driven wheels 12 and at least two or more groups of active wheels 15 remain in contact with the guide rails, which can effectively ensure the balance and stability of the moving workbench 1 during walking.

[0036] When the skin parts are being stretched, the pressure exerted on the mold by the two hydraulic jaws 53 of the skin stretching machine is as high as 1,200 tons. If the active wheel 15 and the driven wheel 12 are used as the bearing parts for stretching, it is easy to cause structural damage to the mobile workbench 1, which poses a great safety hazard. Therefore, the central track b21 and the side track b22 both include a number of escalable track segments 24, and a number of lifting hydraulic cylinders 23 are fixedly arranged on the working area track device 2. The piston rod end of the lifting hydraulic cylinder 23 is fixedly connected to the bottom of the track segment 24, and the lifting hydraulic cylinder 23 is used to drive the track segment 24 to rise and fall. The above-mentioned several track sections 24 correspond to the driving wheels 15 and the driven wheels 12 respectively. When skinning operation is required, the mobile workbench 1 moves to the top of the work area track device 2, and each driving wheel 15 and driven wheel 12 is respectively located above its corresponding track section 24. At this time, the piston rod of the jacking hydraulic cylinder 23 retracts, and the driving wheel 15 and the driven wheel 12 descend together with the track section 24 until the bottom surface of the platform body 11 contacts the top surface of the work area track device 2. At this time, the platform body 11 is a load-bearing structure as a whole, and its load-bearing state is more stable, and it also avoids structural damage caused by excessive load. When the skinning operation is completed, when the piston rod of the jacking hydraulic cylinder 23 is extended, the track section 24 drives each wheel to rise until the top surface of the track section 24 is flush with the top surface of the overall track, so that the mobile workbench 1 can move smoothly above it. In addition, the size design of the track segment 24 can provide it with a positioning function. When the mobile workbench 1 moves until each wheel is just on each track segment 24, it means that the mobile workbench 1 has entered the working position, and there is no need to manually align it with the two stretching devices 5 of the skin stretching machine. It is easy to operate and has accurate positioning.

[0037] Furthermore, the mold rapid replacement system of the FET1200 skin stretching machine also includes a fixed gantry mechanism 4, which includes four support columns 41 and a slider device 42. The slider device 42 is arranged directly above the working area track device 2, and the four support columns 41 are respectively fixedly arranged around the working area track device 2, and the support columns 41 are used to support the slider device. Because the curved surface shapes and sizes of aircraft skin parts are different, the molds used for the stretching work will use a combination mold in addition to the ordinary convex mold, that is, a mold including an upper mold and a lower mold. Therefore, the existing skin stretching machine is provided with a gantry mechanism. In order to avoid the interference problem between the gantry mechanism and the mold replacement work, the gantry mechanism is usually a mobile gantry mechanism. When performing the stretching work of such skin parts, the mobile gantry mechanism enters the working area and fixes the upper mold on its slider device, and then the upper mold is raised and lowered under the action of the slider device to realize the opening and closing of the mold. When the stretching work is completed, the upper mold is removed and the mobile gantry mechanism returns to the initial position. In this process, the gantry mechanism needs to frequently move between its initial position and the working area. This design reduces the efficiency of the skin stretching production; at the same time, due to the poor movement accuracy of the mobile gantry mechanism, the processing accuracy of the skin stretching work is affected. If a mobile gantry mechanism is still used, its running track will make it impossible to lay the track of the quick change system. Therefore, it is changed to the above-mentioned fixed gantry mechanism 4, and its four support columns 41 are respectively fixedly arranged on the four sides outside the working area track device 2, and will not affect the position conversion of the mobile workbench 1. At the same time, since the mold changing work is carried out on the preparation area track device 3, it will not interfere with the mold replacement work. Compared with the mobile gantry mechanism, it does not need to move frequently, and will not affect the processing accuracy due to low running accuracy. It can effectively improve the efficiency of the skin stretching work and the processing quality of the skin parts.

[0038] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A mold quick change system for a FET1200 skin stretching machine, characterized in that: It includes a die replacement track device and two mobile workbenches (1), and the two mobile workbenches (1) are movably arranged on the die replacement track device; The die replacement track device includes a work area track device (2) and two preparation area track devices (3), and the two preparation area track devices (3) are respectively connected to both ends of the work area track device (2); The work area track device (2) and the mobile workbench (1) are both in a king-shaped layout when viewed from above, and the king-shaped notch sizes of the work area track device (2) and the mobile workbench (1) are adapted to each other; The preparation area track device (3) includes a central track a (31) and side tracks a (32) arranged in parallel on both sides of the central track a (31), and the work area track device (2) includes a central track b21 and side tracks b (22) arranged in parallel on both sides of the central track b (21). Both ends of the central track b (21) are respectively connected to two central tracks a (31), and both ends of the side tracks b (22) are respectively connected to two side tracks a (32) on the same side of the two preparation area track devices (3); The side track b (22) is a segmented track, and the segmented position of the side track b (22) corresponds to the king-shaped notch position of the work area track device (2); The mobile workbench (1) includes a platform body (11) with a king-shaped structure. At the central position of the bottom of the platform body (11), a number of driving wheel devices and a number of driven wheels (12) are arranged. The driven wheels (12) are adapted to both the central track a (31) and the central track b (21); The driving wheel device includes a reduction motor (13) with a double output shaft. Both output shafts of the reduction motor (13) are fixedly connected with universal couplings (14), and the other ends of the universal couplings (14) are fixedly connected with driving wheels (15). The driving wheels (15) are adapted to both the side track a (32) and the side track b (22); Four groups of the driving wheel devices are provided, and two of the driven wheels (12) are provided; Both the central track b (21) and the side track b (22) include a number of liftable track segments (24). A number of lifting hydraulic cylinders (23) are fixedly arranged on the work area track device (2). The end of the piston rod of the lifting hydraulic cylinder (23) is fixedly connected to the bottom of the track segment (24), and the lifting hydraulic cylinder (23) is used to drive the track segment (24) to lift and lower.

2. The mold quick change system of the FET1200 skin stretching machine according to claim 1 is characterized in that: It further includes a fixed gantry mechanism (4). The fixed gantry mechanism includes four support columns (41) and a slider device (42). The slider device (42) is arranged directly above the work area track device (2). The four support columns (41) are respectively fixedly arranged around the outside of the work area track device (2), and the support columns (41) are used to support the slider device (42).

3. The mold quick change system of the FET1200 skin stretching machine according to claim 1 is characterized in that: Retractable cover plates (20) are arranged at each notch of the king-shaped layout of the work area track device (2).

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