CN114904953A

CN114904953A - Pipe fitting flattens device

Info

Publication number: CN114904953A
Application number: CN202210588967.0A
Authority: CN
Inventors: 殷克贵; 邓小波; 金陈义; 白天华
Original assignee: Baolong Anhui Auto Parts Co ltd
Current assignee: Baolong Anhui Auto Parts Co ltd
Priority date: 2022-05-26
Filing date: 2022-05-26
Publication date: 2022-08-16

Abstract

The invention provides a pipe fitting flattening device, which is used for processing pipe fittings and comprises: the upper flattening die comprises an upper flattening type part, a pressing device and an upper die plate, and the upper flattening type part and the pressing device are connected to the lower surface of the upper die plate. The flattening lower die comprises a lower flattening type part, a fixed end face positioning device, a pressing device and a bottom plate, wherein the fixed end face positioning device and the pressing device are both installed on the bottom plate, and the fixed end face positioning device is used for fixing the pipe fitting. Before the upper flattening type piece and the lower flattening type piece are matched to apply pressure to the pipe fitting, the pressing device extends into the pipe fitting and presses the inner wall of the pipe fitting under the pushing of the pressing device. Thereby fixed terminal surface positioner restriction pipe fitting makes the pipe fitting accurate positioning along the string of axis direction and the rotation of circumferencial direction, and closing device drive press device compresses tightly pipe fitting welding seam position all the time at flattening forming process, avoids the pipe fitting to produce protrudingly or sunken.

Description

Pipe fitting flattens device

Technical Field

The invention relates to the technical field of pipe fitting processing, in particular to a pipe fitting flattening device.

Background

At present, when a pipe fitting is flattened in a factory, the pipe fitting is circular and easy to roll, so that the pipe fitting is difficult to accurately position on a tool and a die, and the uniformity of the pipe fitting after being flattened is poor. In addition, because the pipe fittings are firstly stressed linearly when being flattened or because the performance of the welding seams of the pipe fittings is different from that of the base body, certain concave or convex can be generated at the linear position where the pipe fittings are firstly contacted or the welding seam position after being flattened, and for products with higher requirements on appearance or size, the process can be added for eliminating the concave or convex, so that the production cost is increased.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides a pipe flattening device, which is used for solving the problems of the prior art that the pipe cannot be accurately positioned and the pipe is flattened to form a concave or convex defect.

In order to achieve the above and other related objects, the present invention provides a pipe fitting flattening device, which comprises a flattening upper die and a flattening lower die, wherein the flattening upper die comprises an upper flattening profile and a pressing device, the flattening lower die comprises a lower flattening profile, a movable positioning device capable of automatically adjusting height along with the pipe fitting flattening process, a fixed end surface positioning device and a pressing device capable of automatically moving, and the pressing device can drive the pressing device to press the pipe fitting.

The invention limits the swing of the pipe fitting in the radial direction through the V-shaped structure formed by the extension lines of the inclined chamfers at the top of the movable positioning device, limits the pipe fitting from moving in the axial direction through the end face of the fixed end face positioning device, and simultaneously limits the pipe fitting from rotating in the circumferential direction through the boss of the end face positioning device, thereby accurately positioning the pipe fitting.

The pressing device is driven by the pressing device to always press the welding seam position of the pipe fitting in the flattening forming process, so that the pressed part of the pipe fitting in the flattening forming process can not generate bulges or depressions.

In one embodiment of the present invention, a tube flattening apparatus for processing a tube (19) is provided, which comprises:

the upper flattening die (100) comprises an upper flattening profile (1), a pressing device (101) and an upper die plate (2), and the upper flattening profile (1) and the pressing device (101) are connected to the lower surface of the upper die plate (2);

the pipe fitting flattening die comprises a flattening lower die (200), wherein the flattening lower die (200) comprises a lower flattening profile (9), a fixed end face positioning device (201), a pressing device (202) and a bottom plate (10), the fixed end face positioning device (201) is installed on the lower flattening profile (9), the pressing device (202) is installed on the bottom plate (10), and the fixed end face positioning device (201) is used for fixing the pipe fitting (19);

before the upper flattening profile piece (1) and the lower flattening profile piece (9) are clamped to press the pipe fitting (19), the pressing device (202) extends into the pipe fitting (19) and presses the inner wall of the pipe fitting (19) under the pushing of the pressing device (101) before clamping is completed.

In an embodiment of the invention, the pressing device (101) comprises a nitrogen spring (4), a spring (5) and a pressing block (6), wherein the lower end of the nitrogen spring (4) is provided with a nitrogen spring head (401), and the upper end of the nitrogen spring is fixed below the upper template (2); the lower end of the spring (5) is connected with the pressing block (6), and the upper end of the spring is connected below the upper template (2) and used for pressing down to enable the pressing block (6) to move downwards.

In one embodiment of the present invention, the fixed end face positioning device (201) includes an end face positioning device (14) disposed on the lower squash profile (9) and located at the front end, the end face positioning device (14) has an end face capable of abutting against one end of the pipe (19) and a boss (141) capable of catching the inner wall of the pipe (19) for limiting the axial movement and the rotation of the pipe (19) in the circumferential direction.

In an embodiment of the invention, the pressing device (202) comprises a pressing block (21), a cylinder (22), a dowel bar (23), a floating lifting plate (24), a cylinder fixing plate (25), a spring (32), a guide support block (29), a first side guide block (30) and a second side guide block (31), the floating lifting plate (24) is an L-shaped structural member which is close to and semi-surrounds the lower squashed profile (9), and the first side guide block (30) and the second side guide block (31) are installed on the floating lifting plate (24); the pressing block (21) is clamped between the first side guide block (30) and the second side guide block (31) and can move between the first side guide block (30) and the second side guide block (31) along the axial direction of the pipe fitting (19) under the driving of the dowel bar (23); the guide support block (29) is arranged on the floating plate (24), the pressing block (21) is positioned on and supported by the guide support block (29), the pressing block (21) is connected to the force transmission rod (23) and can move along the axial direction of the pipe fitting (19) under the drive of the cylinder (22) through the force transmission rod (23), the cylinder (22) is fixed on the floating plate (24) through the cylinder fixing plate (25), and the spring (32) is arranged between the bottom plate (10) and the floating plate (24) and can support the floating plate (24) to move up and down.

In an embodiment of the present invention, the flattening lower die (200) further includes a movable positioning device (203), and the movable positioning device (203) includes at least one pair of positioning pins (15), a positioning pin fixing plate (16), and a spring (17); the upper surface of the lower flattening type piece (9) is provided with a lower flattening cavity (999), the top of the positioning pin (15) is provided with an inclined chamfer (151) matched with the outer surface of the pipe fitting (19), the pair of positioning pins (15) are oppositely arranged, so that the extension line of the inclined chamfer (151) at the top of each positioning pin can form a V shape to be in contact fit with the outer surface of the pipe fitting (19), and the bottom of each positioning pin (15) is fixed on the positioning pin fixing plate (16); the spring (17) installed on the bottom plate (10) is pressed against the positioning pin fixing plate (16); the lower flattening type piece (9) is provided with at least two through holes penetrating through the upper surface and the lower surface, so that the corresponding positioning pins (15) can upwards extend out of the lower surface of the lower flattening type piece (9) into the lower flattening cavity (999), and the positioning pins (15) can simultaneously move up and down along the through holes of the lower flattening type piece (9) and are used for limiting the pipe fitting (19) to swing in the radial direction or the circumferential direction.

In an embodiment of the present invention, the apparatus further includes a bottom plate assembly (204), wherein the bottom plate assembly (204) is disposed on the bottom plate (10), and includes:

the supporting columns (11) are arranged between the lower squashed profile pieces (9) and the bottom plate (10) and are used for supporting the lower squashed profile pieces (9);

the supporting limiting column (13), the supporting plate limiting column (13) is positioned between the bottom plate (10) and the floating plate (24) and is used for preventing the over-pressure condition of the flattening upper die (200) during die assembly;

a first discharge screw (12), said first discharge screw (12) being located between said bottom plate (10) and said heave plate (24) for controlling the height of said spring (32);

and the second discharging screw (18), the second discharging screw (18) is positioned between the bottom plate (10) and the positioning pin fixing plate (16) and is used for controlling the height of the spring (17) and controlling the height of the positioning pin (15).

In an embodiment of the invention, first guide post holes (8) are formed in two side planes of the lower squashing type piece (9), an upper squashing cavity (111) is formed in the lower surface of the upper squashing type piece (1), first inner guide sleeves are arranged on the lower planes of two sides of the upper squashing cavity (111) of the upper squashing type piece (1) so as to mount first inner guide posts (3) matched with the first guide post holes (8) of the lower squashing type piece (9), and the matching between the first inner guide posts (3) and the first guide post holes (8) is used for helping to position and guide the upper squashing die (100) and the lower squashing die (200) to be matched.

In an embodiment of the present invention, a second inner guide sleeve (26) is disposed on a lower plane of the floating plate (24), a second guide hole (27) is disposed on the bottom plate (10), the pressing device (202) is provided with a second inner guide post (28), an upper end of the second inner guide post (28) is mounted in the second inner guide sleeve (26), a lower end of the second inner guide post (28) is mounted in the second guide hole (27) of the bottom plate (10), and the second inner guide post (28) can ensure that the floating plate (24) moves up and down along a vertical direction.

In an embodiment of the invention, the pressing block (21) is provided with a section of arc surface (212) which is in matched contact with the inner wall of the pipe fitting and a counter bore (211), and the counter bore (211) is matched with a plunger of the nitrogen spring head (401) of the nitrogen spring (4).

In an embodiment of the present invention, the bottom plate assembly (204) further includes a spring retainer (7) mounted on the side of the upper mold plate (2) and the bottom plate (10) and beside the spring (32), the nitrogen spring (4) and the spring (5), respectively.

As described above, the pipe fitting flattening package of the present invention has the following beneficial effects: the end face of the fixed end face positioning device limits the pipe fitting to move in a string mode along the axis direction, and the boss of the end face positioning device limits the pipe fitting to rotate in the circumferential direction, so that the pipe fitting is accurately positioned, meanwhile, the pressing device is driven by the pressing device to always press the welding seam position of the pipe fitting in the flattening forming process, and the pressed part of the pipe fitting in the flattening forming process cannot generate bulges or depressions.

Drawings

Fig. 1 is a schematic perspective view of a pipe flattening apparatus according to an embodiment of the present invention, when mold clamping is not completed.

Fig. 2 is a first schematic exploded perspective view of a tube flattening apparatus according to an embodiment of the present invention.

Fig. 3 is a second exploded perspective view of another perspective view of a tube flattening apparatus according to an embodiment of the present invention.

Fig. 4 is a schematic perspective view of a lower die portion of a tube flattening apparatus in accordance with an embodiment of the present invention.

FIG. 5 is an elevation view of a lower die portion of a tube flattening apparatus in accordance with an embodiment of the present invention.

Fig. 6 is a schematic perspective view of a tube flattening apparatus buoyancy plate and a lower flattening profile provided in accordance with an embodiment of the present invention.

Fig. 7 is a schematic top perspective view of a tube flattening apparatus buoyancy plate and a lower flattening profile provided in accordance with an embodiment of the present invention.

Fig. 8 is a schematic cross-sectional view of a pipe flattening apparatus according to an embodiment of the present invention, showing a compression block initially stressed before closing the dies.

Fig. 9 is a cross-sectional view of a tube collapsing apparatus according to an embodiment of the present invention, in a fully clamped state.

Description of the element reference numerals

Flattening the upper die 100; a pressing device 101; flattening the lower die 200; a fixed end face positioning device 201, a pressing device 202 and a movable positioning device 203; a backplane assembly 204;

an upper squashed profile 1; an upper flattening cavity 111; an upper template 2; a first inner guide post 3; a nitrogen spring 4; a nitrogen spring head 401; spring/high load rectangular spring 5; briquetting 6; a spring retainer 7; a first guide post hole 8; a lower squeeze profile 9; the cavity 999 is flattened downwards; a base plate 10; a support column 11; a first equal-height discharge screw 12; a pallet limit post 13; an end face positioning device 14; a boss 141; a positioning pin 15; a chamfer 151; a positioning pin fixing plate 16; a linear spring 17; second equal-height discharge screws 18; a pipe member 19; a product 20; a pressing block 21; a counterbore 211; an arc surface 212; a cylinder 22; a dowel bar 23; a buoyant lift plate 24; a cylinder fixing plate 25; an inner guide sleeve 26; a second guide post hole 27; a second inner guide post 28; a guide holder block 29; a first side guide block 30; a second side guide block 31; spring/rectangular spring 32.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. It is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.

Please refer to fig. 1 to 7. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

Fig. 1 to 7 show a preferred embodiment of the present invention, and the present invention provides a pipe flattening device as shown in fig. 1, which comprises a flattening upper die 100 and a flattening lower die 200, wherein the flattening upper die 100 comprises an upper flattening cavity 1 and a pressing device 101. The flattening lower die 200 comprises a lower flattening profile 9, a fixed end face positioning device 201, a floating pressing device 202, a movable positioning device 203 and a bottom plate assembly 204, wherein the height of the movable positioning device 203 can be automatically adjusted along with the tube flattening process, and the pressing device 101 can drive the pressing device 202 to press the tube 19.

Referring next to fig. 2-7, the perspective views of fig. 2 and 3 show the tube flattening apparatus of the present invention from front to back. The upper flattening die 100 is provided with an upper die plate 2, the lower surface of the upper flattening die is fixedly provided with an upper flattening die 1 by bolts, the upper flattening die 1 is provided with an upper flattening cavity 111, and two sides of the lower plane are respectively and fixedly provided with 3 first inner guide posts 3 through first inner guide sleeves (not shown in the figure). Under the upper die plate 2 in front of and behind the upper flattening type piece 1, a nitrogen spring 4 with a nitrogen spring head 401 is fixedly arranged through bolts, and the type of the nitrogen spring 4 is selected according to pressing force required by CAE analysis of the flattening forming of the pipe fitting. The spring 5 is fixedly arranged on the left side of the lower surface of the upper template 2, the spring 5 is a high-load rectangular spring, and the selection of the high-load rectangular spring is based on the calculation of the floating lift force of the material pressing device. One end of the spring 5 is fixed below the upper template 2 through a discharging screw (not shown in the figure), the other end of the spring is provided with a pressing block 6, the nitrogen spring 4 can provide enough force to press the pressing block 6, and the pressing block 6 moves downwards under the force of the spring 5. Nitrogen springs and other rectangular springs may provide a reasonable pressing force to push the lower flattening die 200 downward during the pressing down of the upper flattening die 100. The spring 5 is provided with a spring baffle 7 at the outer side to prevent the spring from flying out to hurt people.

Fig. 4 and 5 together show a specific structure of the flattening lower die 200. The lower squeeze forming die 200 is provided with a bottom plate 10 on which 4 support columns 11 are provided for supporting the lower squeeze forming die 200 to increase the height thereof, while the support columns 11 are lighter in weight than those supported by a one-piece pad, thereby enabling a corresponding reduction in the die weight. The lower flattening type piece 9 is provided with a lower flattening cavity 999, the upper planes of two sides of the lower flattening type piece 9 are respectively provided with 3 first guide post holes 8, and the first guide post holes 8 are matched with the gaps of the first inner guide posts 3 on the upper flattening type piece 1. As can be seen in connection with fig. 6 and 7, the lower squeeze profile 9 is next to the buoyancy lift plate 24 and is half-enclosed by the L-shaped buoyancy lift plate 24. The lower plane of the floating plate 24 is provided with a second inner guide sleeve 26, the upper end of a second inner guide post 28 is arranged in the second inner guide sleeve 26, the lower end of the second inner guide post 28 is arranged in a second guide post hole 27 of the bottom plate 10, and the second inner guide post 28 can support the floating plate 24 and ensure that the floating plate 24 moves up and down along the vertical direction. The cylinder 22 is fixed to the rising plate 24 by a cylinder fixing plate 25. In order to support the floating plate 24 and keep balance, a first equal-

height discharging screw

12 and 3 springs 32 are also arranged between the floating plate 24 and the bottom plate 10, and the springs 32 are rectangular springs. The first equal-height discharge screw 12 is slidable in a screw hole (not shown) of the bottom plate 10. The floating plate 24 is movably arranged on the bottom plate 10 through a second inner guide post 28 and a spring 32, and can move up and down along the inner guide post. The cylinder 22 is connected with the pressing block 21 through a force transmission rod 23, and the pressing block 21 can move axially by means of force transmission of the cylinder 22, so that the pipe fitting can be conveniently taken and placed. The bottom of the pressing block 21 is provided with a section of cambered surface 212 matched with the inner wall of the flattened pipe material. The pressing block 21 is provided with a counter bore 211 on the upper plane, and the counter bore 211 can be in clearance fit with the plunger of the nitrogen spring 4 of the flattening upper die 100. The floating plate 24 is further provided with a guide support block 29, the floating plate 24 is provided with a first side guide block 30 and a second side guide block 31, the pressing block 21 is in sliding fit with the two side guide blocks, and the pressing block 21 and the guide support block 29 are in clearance fit and are arranged above the guide support block 29. The cylinder 22 drives the pressing block 21 to open or reset backwards through a dowel 23.

The 4 locating pins 15 which are arranged oppositely in pairs and have the same height are fixed on a locating pin fixing plate 16, second equal-height discharging screws 18 are connected with the locating pin fixing plate 16 and the bottom plate 10 and are fixed on the locating pin fixing plate 16, and the second equal-height discharging screws 18 can slide in screw holes (not shown) of the bottom plate 10. One end of the linear spring 17 is arranged on the bottom plate 10, and the other end of the linear spring supports the positioning pin fixing plate 16. The 4 positioning pins 15 are in clearance fit with the 4 holes of the lower crushing block 9 and can simultaneously float up and down under the action of pressure and the linear spring 17. The contact surface of the head of the positioning pin 15 and the pipe 19 is provided with an inclined chamfer 151 matched with the outer diameter of the pipe 19. The end face positioning device 14 is mounted at the front end of the lower squash profile 9 and has a flat surface capable of abutting against the pipe 19 and a boss 141 capable of pressing against the inner wall of the pipe 19 for limiting the axial movement and the circumferential rotation of the pipe 19. The pallet limiting column 13 is connected above the bottom plate 10 through a bolt and is used for preventing the nitrogen spring 4 on the flattening upper die 100 from being over-pressurized.

Spring baffles 7 are arranged outside all the springs on the side surfaces of the upper flattening die 100 and the lower flattening die 200 to block the springs, so that the springs are prevented from being failed and flying out to hurt people.

Fig. 6 and 7 show that the cylinder fixing plate 25 for fixing the cylinder 22 is mounted on the rising plate 24 from different angles, and a guide holder 29 for supporting the pressing block 21 is disposed between the first side guide block 30 and the second side guide block 31 for holding the arc-shaped bottom of the pressing block 21 so that the pressing block 21 can move axially through the first side guide block 30 and the second side guide block 31. The buoyancy plates 24 are semi-enclosed around the lower squeeze profile 9. The end face positioning device 14 is arranged at the front end of the lower squash profile part 9 close to the floating plate 24, the plane in front of the end face positioning device 14 is pressed against the product 20, and the boss 141 is used for clamping the inner wall of the product 20 for positioning. 3 rectangular springs 32 are provided between the heave plate 24 and the base plate 10 to support and keep the heave plate 24 balanced. The upper ends of the 3 second inner guide posts 28 are installed in the second inner guide sleeves 26, the lower ends are installed in the second guide post holes 27 on the bottom plate 10, and the second inner guide posts 28 can ensure that the floating plate 24 can move up and down along the vertical direction. When the pressing block 21 is stressed, the pressing block, the guide support block 29, the first side guide block 30, the second side guide block 31 and the cylinder 22 move downwards along the second inner guide post 28 at the same time, and after the force is removed, the pressing block is reset along the second inner guide post 28 integrally under the action of the rectangular spring 32. Each of the two side planes of the lower squash profile 9 is provided with 3 first guide post holes 8 for cooperating with the first inner guide posts 3 to help position and guide the upper squash die 100 and the lower squash die 200 to be clamped. In which the lower squeeze profiles 9 are stationary and the lifting plates 24 can be moved up and down in the vertical direction.

Referring to fig. 8 and 9, the clamping process is shown in fig. 8 when the clamp blocks 21 just contact the inner wall of the pipe 19. In the mold clamping process state shown in the figure, the positioning pins 15 with the same height 4 before mold clamping are in an extending state, the top parts of the positioning pins are provided with oblique chamfers 151, the positioning pins are opposite to each other in pairs, and a V-shaped supporting pipe 19 is formed on the extension line of the oblique chamfers 151. The first inner guide post 3 and the first guide post hole 8 cooperate to position the mold closing position of the flattening upper mold 100 and the flattening lower mold 200. At this time, the nitrogen spring head 401 of the nitrogen spring 4 of the upper flattening die 100 is aligned with the counterbore 211 of the pressing block 21, and the nitrogen spring 4 pushes the pressing block 6 to be pressed down to the cylinder 22 of the lower flattening die 200.

In the state of continuing pressing, as shown in fig. 9, the head 401 of the nitrogen spring 4 of the flattening upper die 100 extends into the counterbore 211 of the pressing block 21, and the upper stepped portion presses the pressing block 21 to apply a pressing force to the pressing block 21 so as to press the tube 19. The nitrogen spring 4 pushes the pressing block 6 to press downwards on the cylinder 22 of the flattening lower die 200, the 4 positioning pins 15 with the same height are pressed downwards by the pipe 19, and the spring 17 contracts correspondingly.

The operation process of the pipe fitting flattening device comprises the following steps that firstly, the pipe fitting 19 is placed on a positioning block consisting of 4 positioning pins 15, the radial swing of the pipe fitting can be limited by a V-shape formed on an extension line of an inclined chamfer 151, the end face of the pipe fitting 19 is attached to the end face of the end face positioning device 14 so as to limit the pipe fitting 19 to move in the axial direction, meanwhile, the inner wall of the pipe fitting 19 is clamped by a boss 141 of the end face positioning device 14 so as to limit the pipe fitting to rotate in the circumferential direction, and therefore the pipe fitting 19 is accurately positioned. Then the cylinder 22 drives the pressing block 21 to extend forwards into the pipe 19 through the dowel bar 23 for resetting. The lower squashed profile 9 is stationary, the upper squashed die 100 moves down, and the inner guide posts 3 are guided into the first guide post holes 8 of the lower squashed profile 9. The upper flattening die 100 continues to move downwards, and the length of the pipe 19 is smaller than the distance between the front and rear 2 nitrogen springs 4. The nitrogen spring head 401 of the nitrogen spring 4 is introduced into the counterbore of the compact 21, and the stepped portion above the nitrogen spring head 401 abuts against the upper surface of the compact 21. Under the pressure of the nitrogen spring 4, the pressing block 21 is pressed down to be in contact with the pipe 19, and meanwhile, the pressing block 21 drives the floating plate 24 to descend to compress the rectangular spring 32. The upper flattening die 100 continues to move downwards, the pressing block 21 presses the pipe 19 all the time, and the pipe 19 between the lower flattening die cavity 999 and the pressing block 21 is kept in a stable state all the time. Meanwhile, the upper flattening type piece 1 presses the pipe fitting 19, and meanwhile, the 4 positioning pins move downwards along the square hole of the lower flattening type piece 9 under the pressure of pipe deformation to drive the linear spring 17 to compress until the flattening upper die 100 and the flattening lower die 200 are matched, and the pipe fitting 19 is formed into an elliptical product 20 between the upper flattening cavity 111 and the lower flattening cavity 999.

After the die assembly, the upper die 100 is flattened to move upwards, and the linear spring 17 drives the 4 positioning pins 15 to reset through the positioning pin fixing plate 16. Meanwhile, the rectangular spring 32 drives the pressing block 21 to reset through the floating plate 24. The cylinder 22 drives the pressing block 21 to open through the dowel bar 23, and the molded product 20 is taken out, so that one action is finished.

In summary, the present invention limits the radial swing of the pipe fitting by the V-shaped structure formed by the extension line of the top oblique chamfer of the movable positioning device. The end face of the fixed end face positioning device limits the pipe fitting to move in a string mode along the axis direction, and meanwhile the boss of the end face positioning device limits the pipe fitting to rotate in the circumferential direction, so that the pipe fitting is accurately positioned, and stable machining quality is obtained. The pressing device is driven by the pressing device to always press the position of the pipe fitting which is firstly contacted with the die in the flattening and forming process, so that the pressed part of the pipe fitting in the flattening and forming process can not generate bulges or depressions, the product quality is improved, and the production cost is reduced. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A tube flattening apparatus for processing a tube (19), the apparatus comprising:

2. The tube flattening apparatus of claim 1, wherein: the pressing device (101) comprises a nitrogen spring (4), a spring (5) and a pressing block (6), the lower end of the nitrogen spring (4) is provided with a nitrogen spring head (401), and the upper end of the nitrogen spring head is fixed below the upper template (2); the lower end of the spring (5) is connected with the pressing block (6), and the upper end of the spring is connected below the upper template (2) and used for pressing down to enable the pressing block (6) to move downwards.

3. The tube flattening apparatus of claim 1, wherein: the fixed end face positioning device (201) comprises an end face positioning device (14) which is arranged on the lower flattening type piece (9) and is positioned at the front end, and the end face positioning device (14) is provided with an end face capable of propping against one end of the pipe fitting (19) and a boss (141) capable of clamping the inner wall of the pipe fitting (19) and is used for limiting the axial movement and the rotation of the pipe fitting (19) along the circumferential direction.

4. The tube flattening apparatus of claim 1, wherein: the pressing device (202) comprises a pressing block (21), a cylinder (22), a dowel bar (23), a floating plate (24), a cylinder fixing plate (25), a spring (32), a guide support block (29), a first side guide block (30) and a second side guide block (31), the floating plate (24) is an L-shaped structural member which is close to and semi-surrounds the lower squashed profile (9), and the first side guide block (30) and the second side guide block (31) are installed on the floating plate (24); the pressing block (21) is clamped between the first side guide block (30) and the second side guide block (31) and can move between the first side guide block (30) and the second side guide block (31) along the axial direction of the pipe fitting (19) under the driving of the dowel bar (23); the guide support block (29) is arranged on the floating plate (24), the pressing block (21) is positioned on and supported by the guide support block (29), the pressing block (21) is connected to the force transmission rod (23) and can move along the axial direction of the pipe fitting (19) under the drive of the cylinder (22) through the force transmission rod (23), the cylinder (22) is fixed on the floating plate (24) through the cylinder fixing plate (25), and the spring (32) is arranged between the bottom plate (10) and the floating plate (24) and can support the floating plate (24) to move up and down.

5. The tube flattening apparatus of any one of claims 1-4, wherein: the flattening lower die (200) further comprises a movable positioning device (203), and the movable positioning device (203) comprises at least one pair of positioning pins (15), a positioning pin fixing plate (16) and a spring (17); the upper surface of the lower flattening type piece (9) is provided with a lower flattening cavity (999), the top of the positioning pin (15) is provided with an inclined chamfer (151) matched with the outer surface of the pipe fitting (19), the pair of positioning pins (15) are oppositely arranged, so that the extension line of the inclined chamfer (151) at the top of each positioning pin can form a V shape to be in contact fit with the outer surface of the pipe fitting (19), and the bottom of each positioning pin (15) is fixed on the positioning pin fixing plate (16); the spring (17) installed on the bottom plate (10) is pressed against the positioning pin fixing plate (16); the lower flattening profile (9) is provided with at least two through holes penetrating through the upper surface and the lower surface, so that the corresponding positioning pins (15) extend upwards from the lower surface of the lower flattening profile (9) to the lower flattening cavity (999), and the positioning pins (15) can move up and down along the through holes of the lower flattening profile (9) simultaneously and are used for limiting the pipe fittings (19) to swing in the radial direction or the circumferential direction.

6. The tube flattening apparatus of any one of claims 1-4, wherein: further comprising a backplane assembly (204), said backplane assembly (204) disposed on said backplane (10), comprising:

7. The tube flattening apparatus of claim 1, wherein: the upper planes of two sides of the lower flattening type piece (9) are provided with first guide post holes (8), the lower surface of the upper flattening type piece (1) is provided with an upper flattening cavity (111), the lower planes of two sides of the upper flattening type piece (1) are provided with first inner guide sleeves to install first inner guide posts (3) matched with the first guide post holes (8) of the lower flattening type piece (9), and the matching between the first inner guide posts (3) and the first guide post holes (8) is used for helping to position and guide the die assembly of the upper flattening die (100) and the lower flattening die (200).

8. The tube flattening apparatus of claim 4, wherein: the lower plane of the floating plate (24) is provided with a second inner guide sleeve (26), the bottom plate (10) is provided with a second guide post hole (27), the pressing device (202) is provided with a second inner guide post (28), the upper end of the second inner guide post (28) is installed in the second inner guide sleeve (26), the lower end of the second inner guide post (28) is installed in the second guide post hole (27) of the bottom plate (10), and the second inner guide post (28) can ensure that the floating plate (24) can move up and down along the vertical direction.

9. The tube flattening apparatus of claim 4, wherein: the pressing block (21) is provided with a section of cambered surface (212) and a counter bore (211) which are in matched contact with the inner wall of the pipe fitting, and the counter bore (211) is matched with a plunger of the nitrogen spring head (401) of the nitrogen spring (4).

10. The tube flattening apparatus of claim 6, wherein: the bottom plate assembly (204) further comprises a spring baffle (7) which is arranged on the side faces of the upper template (2) and the bottom plate (10) and is respectively positioned beside the spring (32), the nitrogen spring (4) and the spring (5).