An apparatus and method for bending an elliptical part

Abstract

The application discloses an elliptical part bending forming device and method, and relates to the field of advanced manufacturing technology of metal complex components. The device comprises a base and a bending die arranged above the base and used for bending and forming a blank pipe. An installation base plate is arranged at the upper end of the bending die. A driving shaft is arranged at the middle position of the installation base plate. The upper end of the driving shaft is connected with a bending driving part used for driving the rotation of the driving shaft. The bending driving part is connected and fixed with the base through a support frame. An arc-shaped groove matched with the blank pipe is arranged on the side surface of the bending die. A clamping mechanism used for fixing the end part of the blank pipe is arranged on one side of the bending die. The application is designed according to the defects of the existing device, can complete the rapid processing of the elliptical pipe, meets the existing demand, and detachably arranges the traditional bending die, so that the disassembly of the formed part in the later period is facilitated, and the practicality is high.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of advanced manufacturing technology of metal complex components, and particularly relates to an oval part bending forming device and method. BACKGROUND

[0002] Metal hollow curved components are widely used in key parts of high-end manufacturing fields such as aerospace, automobile, ship and nuclear power due to their light weight, low cost and high specific strength, and bear the functions of transporting medium such as fuel, oxygen and exhaust.

[0003] The metal pipe numerical control bending forming technology is a mainstream pipe forming technology at present, has the characteristics of high forming efficiency, high forming precision, high forming quality and small component bending radius, and has been widely applied in engineering.

[0004] However, with the continuous development of equipment manufacturing, in order to further improve the space utilization, higher requirements are put forward for the shape of the component. At present, in some special industrial manufacturing fields, in order to adapt to the arrangement of internal parts of equipment, there is a certain demand for metal curved components with non-standard circular arc. The traditional bending forming device can only form the curved components with standard circular arc shape, and cannot form the curved components with closed structure, which limits the application of numerical control bending technology to some extent.

[0005] Based on this, an oval part bending forming device and method are provided, which can eliminate the drawbacks of the existing device. SUMMARY

[0006] The purpose of the present application is to provide an oval part bending forming device and method to solve the problems in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] An oval part bending forming device comprises a base and a bending die arranged above the base for bending and forming a blank pipe, an installation base plate is arranged at the upper end of the bending die, a driving shaft is arranged at the middle position of the installation base plate, the upper end of the driving shaft is connected with a bending driving part for driving the rotation of the driving shaft, the bending driving part is connected and fixed with the base through a support frame, an arc-shaped groove matched with the blank pipe is arranged on the side surface of the bending die, a clamping mechanism for fixing the end part of the blank pipe is arranged on one side of the bending die, a guide roller matched with the bending die and used for pressing the other side of the blank pipe is arranged on one side of the bending die, the guide roller is connected with a displacement adjusting part used for adjusting the position of the guide roller to better match the bending die, and a pushing mechanism for pushing the end part of the blank pipe is further arranged at the upper end of the base.

[0009] Based on the above technical solutions, the present invention also provides the following optional technical solutions:

[0010] In one alternative embodiment: the displacement adjusting component includes a sliding positioning seat at the upper end of the base, a sliding column slidably fitted in a horizontal sliding hole at the upper end of the sliding positioning seat, a second connecting rod at the end of the sliding column, a rotating column rotatably connected to the shaft end of the guide roller at the lower end of the second connecting rod, a first connecting rod at the end of the second connecting rod, a downwardly positioned guide column at the end of the first connecting rod, a guide rail at the upper end of the bending die, the guide column slidably disposed with the inner wall of the guide rail, and the line connecting the center point of the guide column and the center point of the guide roller passes through the center point of the bending die.

[0011] In one alternative embodiment: the bending mold includes an upper forming mold located on the upper side and a lower forming mold located on the lower side, the lower forming mold and the upper forming mold are symmetrically arranged, the contact surfaces of the lower forming mold and the upper forming mold are provided with an anti-slip layer, the lower middle position of the lower forming mold is rotatably connected to the output end of the separation push rod, and the lower end of the separation push rod is fixedly connected to the upper end of the base.

[0012] In one alternative: the lower end of the upper forming mold is provided with a pin, and the upper end of the lower forming mold is provided with a pin hole that mates with the pin.

[0013] In one alternative embodiment: the propulsion mechanism includes an inclined feeding guide plate, the end of which is provided with a limiting stop that mates with the outer wall of the blank tube, the end of which is fixed with a forming push rod, the output end of which is provided with a feed push block that mates with the end of the blank tube, the lower end of which is provided with a sliding seat that is slidably disposed with the upper end of the base, and the sliding seat is connected to the second connecting rod by a synchronizing rod.

[0014] In one alternative embodiment: the clamping mechanism includes an end clamping block for pressing the outside of the blank tube, the middle position of one side of the end clamping block is rotatably connected to the fixing block at the upper end of the bending die, the upper end of the end clamping block is rotatably connected to the output end of the clamping push rod, and the tail of the clamping push rod is rotatably connected to the upper end of the mounting base plate.

[0015] A method for bending and forming an elliptical part includes the following steps:

[0016] The first step is to extract the central axis of the pipe based on the characteristics of the formed pipe component;

[0017] The second step is to divide the geometric center axis of the pipe into i forming segments based on the characteristics of the curved and straight sections;

[0018] Third step, according to the size of the pipe material geometric center axis bending segment elliptical arc segment in the third step, select the size of the bending die;

[0019] Fourth step, according to the pipe forming segment division, the bending die rotation angle and horizontal transverse distance in different forming segments are calculated, and the feeding distance of the advancing mechanism along the pipe axial direction is calculated;

[0020] In the third step, based on A=2a, B=2b, select the size of the bending die;

[0021] In the fourth step, the distance between the bending center axis of the initial position of the bending die and the pipe center axis is

[0022] In the fourth step, during the bending segment forming process, if the bending segment arc length is n times (n=1, 2, 3, 4) of the bending die outer contour arc length 1 / 4, then the distance between the bending die and the pipe center axis in the direction perpendicular to the blank pipe end surface is: the distance of the advancing mechanism along the pipe axial direction relative to the initial position is: S yi = n [2 (B-A) + Aπ] / 4; the angle of the bending die rotating around the center relative to the initial position is: θ i =nπ / 2.

[0023] In the fourth step, in each forming segment, if the forming time is t i , then the angular velocity of the bending die rotating around the center is: w i =(θ i -θ i-1 ) / t i ; the linear motion velocity of the advancing mechanism feeding along the pipe axial direction is: v i =(S yi -S yi-1 ) / t i .

[0024] Compared with the prior art, the beneficial effects of the present application are as follows:

[0025] 1、The present application is designed for the disadvantages of the existing device, which can complete the rapid processing of elliptical pipe fittings, meet the existing demand, and the traditional bending die can be detachably arranged, which is convenient for disassembly of the formed part in the later period, and has high practicality. DETAILED DESCRIPTION

[0026] Figure 1 is a structural schematic diagram of the present application.

[0027] Figure 2 is a structural schematic diagram of another side of the present application

[0028] Figure 3 is a structural schematic diagram of the first connecting rod and the second connecting rod of the present application.

[0029] Figure 4 This is a schematic diagram of the structure after the lower molding die and the upper molding die of the present invention are separated.

[0030] Figure 5 This is a schematic diagram illustrating the molding method of the present invention.

[0031] Figure 6 This is a schematic diagram of the structure of the blank tube after bending in this invention.

[0032] Reference numerals in the attached drawings: base 11, lower forming mold 12, upper forming mold 13, support frame 14, mounting base plate 15, bending drive component 16, first connecting rod 17, second connecting rod 18, blank tube 19, limiting stop 20, forming push rod 21, feed push block 22, feeding guide plate 23, sliding column 24, sliding positioning seat 25, guide roller 26, end clamping block 27, clamping push rod 28, separation push rod 29, guide rail 30, guide column 31. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] In one embodiment, such as Figures 1-6 As shown, an elliptical part bending forming device includes a base 11 and a bending die disposed above it for bending a blank tube 19. The upper end of the bending die is provided with a mounting base 15, and a drive shaft is provided in the middle of the mounting base 15. The upper end of the drive shaft is connected to a bending drive component 16 for driving it to rotate. The bending drive component 16 is connected and fixed to the base 11 through a support frame 14. The side of the bending die is provided with an arc-shaped groove that cooperates with the blank tube 19. One side of the bending die is provided with a clamping mechanism for fixing the end of the blank tube 19. One side of the bending die is provided with a guide roller 26 that cooperates with it to press against the other side of the blank tube 19. The guide roller 26 is connected to a displacement adjustment component for adjusting its position so as to better cooperate with the bending die.

[0035] The bending mold comprises an upper forming die 13 arranged on the upper side and a lower forming die 12 arranged on the lower side, the lower forming die 12 and the upper forming die 13 are symmetrically arranged, the contact surfaces of the lower forming die 12 and the upper forming die 13 are provided with anti-skid layers, in order to further prevent the lower forming die 12 and the upper forming die 13 from slipping, the lower end of the upper forming die 13 is provided with a bolt, the upper end of the lower forming die 12 is provided with a bolt hole matched with the bolt, the middle position of the lower end of the lower forming die 12 is rotationally connected with the output end of a separation pushing rod 29, the lower end of the separation pushing rod 29 is fixedly connected with the upper end of the base 11, after the later forming is completed, since the blank pipe 19 is tightly contacted with the bending mold, the blank pipe 19 is not easy to be taken out, at this time, the lower forming die 12 is driven by the separation pushing rod 29 to move downward, at this time, the upper forming die 13 is separated from the lower forming die 12, so that the formed part can be taken out from the gap between the lower forming die 12 and the upper forming die 13, at this time, the bolt has been separated from the bolt hole, and the taking out of the formed part will not be affected;

[0036] The displacement adjusting member comprises a sliding positioning seat 25 arranged on the upper end of the base 11, a sliding column 24 is slidingly matched in the horizontal sliding hole on the upper end of the sliding positioning seat 25, the end of the sliding column 24 is provided with a second connecting rod 18, the lower end of the second connecting rod 18 is rotationally provided with a rotating column connected with the shaft end of a guide roller 26, the end of the second connecting rod 18 is provided with a first connecting rod 17, the end of the first connecting rod 17 is provided with a guide column 31 arranged downward, the upper end of the bending mold is provided with a guide rail 30, the guide column 31 is slidingly arranged with the inner wall of the guide rail 30, the line connecting the center point of the guide column 31 with the center point of the guide roller 26 passes through the center point of the bending mold, since the bending mold itself is an elliptical structure, with the rotation of the bending mold, the distance of the side of the bending mold close to the guide roller 26 will change constantly, at this time, under the guidance of the guide column 31, the first connecting rod 17 and the second connecting rod 18 will drive the guide roller 26 to slide synchronously, so that the guide roller 26 always cooperates with the bending mold, and the bending of the blank pipe 19 is realized;

[0037] The upper end of the base 11 is further provided with a pushing mechanism for pushing the end of the blank pipe 19, the pushing mechanism comprises an obliquely arranged feeding guide plate 23, the end of the feeding guide plate 23 is provided with a limiting stop edge 20 matched with the outer wall of the blank pipe 19, the end of the limiting stop edge 20 is fixedly provided with a forming pushing rod 21, the output end of the forming pushing rod 21 is provided with a feeding pushing block 22, the feeding pushing block 22 is matched with the end of the blank pipe 19, the lower end of the feeding guide plate 23 is provided with a sliding seat, the sliding seat is slidingly arranged with the upper end of the base 11, the sliding seat and the second connecting rod 18 are connected through a synchronous rod, so that the position of the pushing mechanism can be constantly pushed by the displacement adjusting member, so as to ensure that the pushing mechanism always corresponds to the tail of the blank pipe 19 in the process of being bent.

[0038] The clamping mechanism includes an end clamping block 27 for pressing the outer side of the blank tube 19. The middle position of one side of the end clamping block 27 is rotatably connected to the fixing block at the upper end of the bending mold. The upper end of the end clamping block 27 is rotatably connected to the output end of the clamping push rod 28. The tail of the clamping push rod 28 is rotatably connected to the upper end of the mounting base plate 15. The end clamping block 27 is rotated around its rotation axis by the extension and retraction of the clamping push rod 28, thereby completing the clamping and fixing of the end of the blank tube 19.

[0039] In use, the blank tube 19 to be processed is placed on the feeding guide plate 23. The bottom blank tube 19 will press against the inner wall of the limiting stop 20. Then, the blank tube 19 is pushed into the gap between the bending die and the guide roller 26 by the pushing mechanism. The end of the blank tube 19 is fixed by the clamping mechanism. Then, the bending drive 16 drives the bending die to rotate. The rotation speed is matched with the pushing speed of the pushing mechanism, so that the blank tube 19 is bent around the outside of the bending die. During the bending process, the guide roller 26 cooperates with the arc groove on the outside of the bending die to press the blank tube 19 tightly. The clamping mechanism rotates with the bending die, so that the blank tube 19 is bent into an ellipse that matches the shape of the bending die. During the bending process, the displacement adjustment component will drive the pushing mechanism and the sliding positioning seat 25 to make fine adjustments to ensure that the bending is smooth. After the forming is completed, the lower forming die 12 is separated from the upper forming die 13 by the separation push rod 29. At this time, the tube that is in close contact with the bending die will be quickly separated, which facilitates the removal of the part later.

[0040] A method for bending and forming an elliptical component includes the following steps:

[0041] The first step is to extract, such as Figure 4 The geometric center axis of the bend shown;

[0042] The second step is to divide the straight and curved sections into three forming sections with lengths L1, L2, and L3 based on the geometric center axis mentioned above and according to the characteristics of the straight and curved sections. Among them, L2 is an elliptical arc curved section. The arc lengths of L1, L2, and L3 are 50mm, 16mm, and 50mm, respectively, and a and b are 12.5mm and 25mm, respectively.

[0043] The third step is to select a bending mold that matches the size of the elliptical arc segment, where A = 2a = 25mm and B = 2b = 50mm.

[0044] Fourth step, calculate the distance S between the bending die and the central axis of the tube in the direction perpendicular to the end face of the blank tube 19 in the i-th (i = 1, 2, 3) forming segment. xi The distance S of the propulsion mechanism along the axial direction of the pipe relative to the initial position yiand the angle θ of the bending die's rotation about its center relative to its initial position. i Initially, the distance from the center of the bending die to the central axis of the blank tube 19 is: S x0 =30mm; when i=1, S x1 =30mm, θ1=0, S y =50mm; when i=2, S x2 =17.5mm, θ2=π / 2, S y2 =66mm; when i=3, S x3 =17.5mm, θ3=π / 2, S y3 =116mm; take the forming time t i The angular velocities of the elliptical bending mold (1) rotating around its center in each forming section are: w1 = 0, w2 = π / 4 rad / s, w3 = 0; the linear motion speeds of the propulsion mechanism along the pipe axis in each forming section are: v1 = 10 mm / s, v2 = 8 mm / s, v3 = 10 mm / s.

[0045] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An elliptical part bending forming device, comprising a base (11) and a bending die disposed thereon for bending a blank tube (19), characterized in that, The bending die has a mounting base (15) at its upper end. A drive shaft is located in the middle of the mounting base (15). The upper end of the drive shaft is connected to a bending drive (16) for driving the bending die to rotate. The bending drive (16) is connected and fixed to the base (11) through a support frame (14). The side of the bending die has an arc-shaped groove that matches the blank tube (19). One side of the bending die has a clamping mechanism for fixing the end of the blank tube (19). One side of the bending die has a guide roller (26) that matches it and presses the other side of the blank tube (19). The guide roller (26) is connected to a displacement adjustment component for adjusting its position so that it matches the bending die better. The upper end of the base (11) also has a pushing mechanism for pushing the end of the blank tube (19). The displacement adjustment component includes a sliding positioning seat (25) on the upper end of the base (11). A sliding column (24) is slidably fitted in a horizontal sliding hole at the upper end of the sliding positioning seat (25). A second connecting rod (18) is provided at the end of the sliding column (24). A rotating column connected to the shaft end of the guide roller (26) is rotatably provided at the lower end of the second connecting rod (18). A first connecting rod (17) is provided at the end of the second connecting rod (18). A guide column (31) is provided at the end of the first connecting rod (17). A guide rail (30) is provided at the upper end of the bending mold. The guide column (31) is slidably disposed with the inner wall of the guide rail (30). The line connecting the center point of the guide column (31) and the center point of the guide roller (26) passes through the center point of the bending mold.

2. The elliptical part bending forming device according to claim 1, characterized in that, The bending mold includes an upper forming mold (13) located on the upper side and a lower forming mold (12) located on the lower side. The lower forming mold (12) and the upper forming mold (13) are symmetrically arranged. The contact surfaces of the lower forming mold (12) and the upper forming mold (13) are provided with an anti-slip layer. The lower middle position of the lower forming mold (12) is rotatably connected to the output end of the separation push rod (29). The lower end of the separation push rod (29) is connected and fixed to the upper end of the base (11).

3. The elliptical part bending forming device according to claim 2, characterized in that, The upper forming mold (13) is provided with a pin at its lower end, and the lower forming mold (12) is provided with a pin hole at its upper end that cooperates with the pin.

4. The elliptical part bending forming device according to claim 1, characterized in that, The propulsion mechanism includes an inclined feeding guide plate (23). The end of the feeding guide plate (23) is provided with a limiting stop (20) that cooperates with the outer wall of the blank tube (19). A forming push rod (21) is fixed at the end of the limiting stop (20). The output end of the forming push rod (21) is provided with a feed push block (22). The feed push block (22) is fitted with the end of the blank tube (19). A sliding seat is provided at the lower end of the feeding guide plate (23). The sliding seat is slidably disposed with the upper end of the base (11). The sliding seat is connected to the second connecting rod (18) through a synchronous rod.

5. The elliptical part bending forming device according to claim 1, characterized in that, The clamping mechanism includes an end clamping block (27) for pressing the outside of the blank tube (19). The middle position of one side of the end clamping block (27) is rotatably connected to the fixing block at the upper end of the bending mold. The upper end of the end clamping block (27) is rotatably connected to the output end of the clamping push rod (28). The tail of the clamping push rod (28) is rotatably connected to the upper end of the mounting base plate (15).

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