Continuous roll bending forming process for P-type pipe

Abstract

The invention relates to the technical field of roll bending forming, and provides a continuous roll bending forming process for a P-type pipe, the top edge is divided into a long side top edge and a step side top edge, and the continuous roll bending forming process comprises the following steps that a to-be-machined hot-rolled plate is fed into a cold bending unit to be subjected to sixteen-pass continuous deformation to obtain a P-type blank; and then the P-type blank is fed into an extrusion roller to complete welding of the top edge of the long side and the top edge of the step side. The technological process is more continuous, and the production efficiency can be improved conveniently; the shape change in the forming process can be more accurately controlled, and the forming precision is higher; and special rollers are not needed, so that the cost can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of roll bending, and in particular to a continuous roll bending process for a P-type pipe. Background Art

[0002] An existing P-type pipe section is as follows Figure 1 As shown, it includes a bottom edge 101, a long side edge 102 located on one side of the bottom edge, a stepped side edge located on the other side of the bottom edge, and a top edge, forming a P-type structure as a whole, wherein the stepped side edge includes an upper short side edge 103, a middle horizontal side edge 104, and a lower short side edge 105 from top to bottom.

[0003] At present, for the forming of the above-mentioned P-type pipe, the forming scheme is usually to first form a circle and then form a P shape. This method requires a large number of molds and can only be completed by making special rollers. The process is not continuous, the production cost is high, and the production efficiency is low. In addition, due to factors such as mold wear and material rebound, the forming accuracy is also poor. Therefore, how to provide a P-type pipe forming process that can overcome the above-mentioned defects is an urgent problem to be solved in this field. Summary of the invention

[0004] The object of the present invention is to provide a P-type pipe continuous roll bending forming process to solve the above-mentioned defects of the prior art.

[0005] The present invention is achieved through the following technical solutions:

[0006] A continuous roll-bending process for a P-type pipe, wherein the top edge is divided into a long side top edge and a step side top edge, comprises the following steps:

[0007] The hot-rolled plate to be processed is sent to the cold bending unit and subjected to sixteen continuous deformations to obtain a P-type blank; wherein the sixteen continuous deformations are respectively:

[0008] In the first pass, the hot rolled plate is rolled, and the hot rolled plate does not deform after rolling;

[0009] The second to fifth passes are used to form the long side top edge and the step side top edge to 72° at angles of 16°, 32°, 48° and 72° respectively;

[0010] The sixth to eighth passes are to form the long side and the lower short side of the step side to 48° at angles of 20°, 32° and 48° respectively;

[0011] The ninth to twelfth passes are used to form the middle horizontal side and the upper short side of the step side to 90 degrees at angles of 25 degrees, 50 degrees, 75 degrees and 90 degrees respectively;

[0012] In the thirteenth pass, the long side and the lower short side of the step side are formed to 64°;

[0013] In the 14th to 16th passes, the long side and the lower short side of the step side are formed to 82 degrees at angles of 76 degrees, 80 degrees and 82 degrees respectively; at the same time, the long side top and the step side top are formed to 85 degrees at angles of 75 degrees, 78 degrees and 85 degrees respectively;

[0014] Subsequently, the P-type blank is fed into the squeezing roller to complete the welding of the long side top edge and the step side top edge.

[0015] Optionally, in the first to sixth passes, a limiting guide device is provided between adjacent passes, and the limiting guide device achieves limiting and guiding of the hot-rolled plate by supporting the bottom and limiting the two sides and the top at the same time.

[0016] Optionally, the limiting guide device includes:

[0017] A base, wherein a supporting roller is provided on the base;

[0018] Two side seats are arranged in parallel and provided with side limiting rollers, the side seats are slidably and lockably arranged on the base, and a telescopic seat is fixedly arranged on the top of the base;

[0019] A mounting seat, with telescopic rods at both ends of the mounting seat, and the telescopic rods are slidably connected to the telescopic seat; and

[0020] A top seat with a top limiting roller is provided, and the top seat is connected to the mounting seat.

[0021] Optionally, at least two connecting rods are provided on the top of the top seat, the upper ends of the connecting rods pass through the mounting seat and are hung on the mounting seat through connecting nuts, an elastic member is pressed between the top seat and the mounting seat, and the elastic member is sleeved on the connecting rods.

[0022] Optionally, a limiting screw is connected to the mounting seat, and a limiting plate for limiting the upward movement distance of the top seat is provided at the lower end of the limiting screw.

[0023] Optionally, a slide groove is provided on the base for the side seat to slide, an adjusting screw is rotatably provided in the slide groove, and the side seat and the adjusting screw are matched through threads.

[0024] Optionally, the telescopic seat is connected with a limit screw for limiting the displacement of the telescopic rod.

[0025] The technical solution of the present invention has at least the following advantages and beneficial effects: in the present invention, a P-type blank is obtained by a cold bending unit through sixteen continuous deformations, and finally a P-type pipe is formed by extrusion welding. The process is more continuous, which is convenient for improving production efficiency; the shape change during the forming process can also be more accurately controlled, and the forming accuracy is higher; and there is no need to use special rolling rollers, which can effectively reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the cross-sectional structure of a P-type pipe;

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of a P-type blank;

[0028] Figure 3 It is a schematic diagram of the roller pattern of the continuous roller bending of the P-type pipe of the present invention;

[0029] Figure 4 It is a schematic diagram of the roller patterns from the first pass to the fifth pass;

[0030] Figure 5 It is a schematic diagram of the roller pattern from the sixth to the eighth pass;

[0031] Figure 6 It is a schematic diagram of the roller pattern from the ninth to the twelfth pass;

[0032] Figure 7 It is a schematic diagram of the roller pattern of the thirteenth to sixteenth passes and extrusion welding;

[0033] Figure 8 It is a structural schematic diagram of the limiting guide device;

[0034] Figure markings: 100-P type pipe, 101-bottom edge, 102-long side edge, 103-upper short side edge, 104-middle horizontal edge, 105-lower short side edge, 107-long side top edge, 108-step side top edge, 200-limiting guide device, 201-base, 202-support roller, 203-side seat, 204-side limiting roller, 205-telescopic seat, 206-mounting seat, 207-telescopic rod, 208-top seat, 209-top limiting roller, 210-connecting rod, 211-connecting nut, 212-elastic member, 213-limiting screw, 214-limiting plate, 215-adjusting screw, 216-limiting screw, 217-anti-slip block. DETAILED DESCRIPTION

[0035] refer to Figure 3-Figure 7 , a continuous roll-bending process for P-type pipes. The idea of ​​the present invention is to form a P-type pipe 100 by extruding and welding the plate after continuous roll-bending. Therefore, the present invention divides the top edge into a long side top edge 107 and a step side top edge 108 (refer to Figure 2 ), that is, the welding point is set at the top edge, based on the bottom edge 101, and the two sides are continuously rolled and bent, specifically, including the following steps:

[0036] The hot-rolled plate to be processed is sent to the cold bending unit and is continuously deformed for sixteen times to obtain a P-type blank; it should be understood that the width of the hot-rolled plate to be processed matches the unfolded size of any cross section of the P-type pipe 100.

[0037] Among them, the sixteen continuous deformations are:

[0038] In the first pass, the hot rolled plate is rolled, and the hot rolled plate does not deform after rolling;

[0039] The second to fifth passes are performed to form the long side top edge 107 and the step side top edge 108 to 72° at angles of 16°, 32°, 48° and 72° respectively;

[0040] The sixth to eighth passes are performed to form the long side 102 and the lower short side 105 of the step side to 48° at angles of 20°, 32° and 48° respectively;

[0041] The ninth to twelfth passes are performed to form the middle horizontal side 104 and the upper short side 103 of the step side to 90 degrees at angles of 25 degrees, 50 degrees, 75 degrees and 90 degrees respectively;

[0042] In the thirteenth pass, the long side 102 and the lower short side 105 of the step side are formed to 64°;

[0043] In the 14th to 16th passes, the long side 102 and the lower short side 105 of the step side are formed to 82 degrees at angles of 76 degrees, 80 degrees and 82 degrees respectively; at the same time, the long side top 107 and the step side top 108 are formed to 85 degrees at angles of 75 degrees, 78 degrees and 85 degrees respectively;

[0044] Subsequently, the P-type blank is fed into the squeezing rollers to complete the welding of the long side top edge 107 and the step side top edge 108 .

[0045] As can be seen from the above, the process of the present invention is more continuous, which is convenient for improving production efficiency; it is divided into multiple passes with small-angle roll bending, and can more accurately control the shape changes in the forming process, effectively control the amount of springback, and have higher forming accuracy; and there is no need to use special rolling rollers, which can effectively reduce costs.

[0046] During the first six passes, deviation or even warping is likely to occur when entering the next pass from the previous pass. For this reason, in the first to sixth passes of the present invention, a limiting guide device 200 is provided between adjacent passes. In the present invention, the limiting guide device 200 adopts the bottom support, and the two sides and the top are limited at the same time to achieve the limitation and guidance of the hot-rolled plate. It is worth noting that in the traditional roll bending process, vertical rollers are usually provided to solve the deviation and warping. However, the guide wheel shape of the vertical rollers between traditional passes is specially designed for the shape of the plate of the two passes before and after its position, that is, the vertical rollers between each adjacent pass are specially designed, the cost is relatively high, and they cannot be used universally. In the present invention, the above method is adopted to solve the deviation and warping, so that the above limiting guide device 200 can be used universally between each adjacent pass.

[0047] Specifically, refer to Figure 8 The limiting guide device 200 of this embodiment includes a base 201, a side seat 203, a mounting seat 206 and a top seat 208. The base 201 is provided with a support roller 202, two side seats 203 are arranged in parallel and each side seat 203 is provided with a side limiting roller 204, and the top seat 208 is provided with a top limiting roller 209. In the figure, taking the plate that has completed the fifth pass and entered the sixth pass as an example, the support roller 202, the top limiting roller 209 and the two side limiting rollers 204 jointly realize the limitation of the plate.

[0048] Furthermore, the side seat 203 is slidably and lockably arranged on the base 201, and a telescopic seat 205 is fixedly arranged on the top of the base 201; telescopic rods 207 are arranged at both ends of the mounting seat 206, and the telescopic rods 207 are slidably connected to the telescopic seat 205, and the top seat 208 is connected to the mounting seat 206. Such a configuration facilitates the adjustment of the distance between the two side limiting rollers 204, so that the same set of limiting guide devices 200 can be used in different passes. During processing, it is only necessary to process multiple sets of limiting guide devices 200 according to the same design, thereby avoiding the cost increase caused by designing different vertical rollers for different passes.

[0049] In this embodiment, the side seat 203 can slide and lock in the following manner: a slide groove is provided on the base 201 for the side seat 203 to slide, and an adjusting screw 215 is rotatably provided in the slide groove. The side seat 203 and the adjusting screw 215 are threadedly matched, so that the side seat 203 can be driven to move by rotating the adjusting screw 215, thereby adjusting the relative distance between the two side seats 203. In other embodiments, of course, other structures can also be used to achieve the sliding and locking of the side seat 203.

[0050] In this embodiment, in order to prevent the telescopic rod 207 from slipping off the telescopic seat 205, an anti-slip block 217 is provided at the end of the telescopic rod 207, and a hole that cooperates with the telescopic rod 207 is provided on the telescopic seat 205, and the anti-slip block 217 is inside the telescopic seat 205. Furthermore, in this embodiment, a limit screw 216 is connected to the telescopic seat 205. After the side seat 203 is adjusted to the right position, the limit screws 216 on the two telescopic seats 205 work together to press against the telescopic rod 207, thereby limiting the position of the top seat 208 and preventing it from being displaced relative to the side seat 203.

[0051] On the basis of the above, at least two connecting rods 210 are provided on the top of the top seat 208, the upper ends of the connecting rods 210 pass through the mounting seat 206 and are hung on the mounting seat 206 through the connecting nuts 211, and an elastic member 212 is pressed between the top seat 208 and the mounting seat 206, and the elastic member 212 is sleeved on the connecting rods 210. It is worth noting that such a setting, on the one hand, is convenient for adapting to plates of different thicknesses, and on the other hand, it prevents the support roller 202 and the top limiting roller 209 from excessively squeezing the plate and causing deformation of the plate. Preferably, the elastic member 212 of this embodiment is a spring.

[0052] Furthermore, a limiting screw 213 is connected to the mounting seat 206, and a limiting plate 214 is provided at the lower end of the limiting screw 213 for limiting the upward movement distance of the top seat 208. It is worth noting that, based on the setting of the elastic member 212, the setting of the limiting plate 214 can limit the upward movement distance of the top limiting roller 209, thereby ensuring that the limiting effect of the top limiting roller 209 will not fail.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A P-type pipe continuous roll bending process, characterized in that: Dividing the top edge into a long side top edge and a step side top edge includes the following steps: The hot-rolled plate to be processed is sent to the cold bending unit and subjected to sixteen continuous deformations to obtain a P-type blank; wherein the sixteen continuous deformations are respectively: In the first pass, the hot rolled plate is rolled, and the hot rolled plate does not deform after rolling; The second to fifth passes are used to form the long side top edge and the step side top edge to 72° at angles of 16°, 32°, 48° and 72° respectively; The sixth to eighth passes are to form the long side and the lower short side of the step side to 48° at angles of 20°, 32° and 48° respectively; The ninth to twelfth passes are used to form the middle horizontal side and the upper short side of the step side to 90 degrees at angles of 25 degrees, 50 degrees, 75 degrees and 90 degrees respectively; In the thirteenth pass, the long side and the lower short side of the step side are formed to 64°; In the 14th to 16th passes, the long side and the lower short side of the step side are formed to 82 degrees at angles of 76 degrees, 80 degrees and 82 degrees respectively; at the same time, the long side top and the step side top are formed to 85 degrees at angles of 75 degrees, 78 degrees and 85 degrees respectively; Subsequently, the P-type blank is fed into the squeezing roller to complete the welding of the long side top edge and the step side top edge.

2. The continuous roll-bending process for P-type pipes according to claim 1 is characterized in that: In the first to sixth passes, a limiting guide device is arranged between adjacent passes, and the limiting guide device achieves limiting and guiding of the hot-rolled plate by supporting the bottom and limiting the two sides and the top at the same time.

3. The continuous roll-bending process for P-type pipes according to claim 2, characterized in that: The limiting guide device comprises: A base, wherein a supporting roller is provided on the base; Two side seats are arranged in parallel and provided with side limiting rollers, the side seats are slidably and lockably arranged on the base, and a telescopic seat is fixedly arranged on the top of the base; A mounting seat, with telescopic rods at both ends of the mounting seat, and the telescopic rods are slidably connected to the telescopic seat; and A top seat with a top limiting roller is provided, and the top seat is connected to the mounting seat.

4. The P-type pipe continuous roll bending process according to claim 3 is characterized in that: At least two connecting rods are arranged on the top of the top seat, the upper ends of the connecting rods pass through the mounting seat and are hung on the mounting seat through connecting nuts, an elastic member is pressed between the top seat and the mounting seat, and the elastic member is sleeved on the connecting rods.

5. The P-type pipe continuous roll bending process according to claim 4, characterized in that: The mounting seat is connected with a limiting screw rod, and the lower end of the limiting screw rod is provided with a limiting plate for limiting the upward movement distance of the top seat.

6. The continuous roll-bending process for P-type pipes according to any one of claims 3 to 5, characterized in that: The base is provided with a slide groove for the side seat to slide, an adjusting screw is rotatably arranged in the slide groove, and the side seat and the adjusting screw are matched through threads.

7. The continuous roll-bending process for P-type pipes according to any one of claims 3 to 5, characterized in that: The telescopic seat is connected with a limit screw for limiting the displacement of the telescopic rod.

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