A seamless stainless steel pipe and a cold rolling process thereof

Abstract

The application discloses a seamless stainless steel pipe and a cold rolling process thereof, and aims to provide a seamless stainless steel pipe and a cold rolling process thereof with short turnover time and high efficiency when the seamless stainless steel pipe is processed. The seamless stainless steel pipe comprises a long straight pipe body, and a plurality of drainage holes are arranged on the long straight pipe body and are arranged on the same straight line and at equal intervals. The application has the beneficial effects that: the cold rolling device adopts side-by-side arrangement of a cold rolling roller group and a shape correcting roller group, turnover is facilitated, equipment arrangement is facilitated, a process flow is simple in design, turnover time is reduced, and production efficiency is high; the turnover device is arranged at one end of the cold rolling roller group and the shape correcting roller group, the layout facilitates turnover and improves production efficiency; the lead-out roller and the lead-in roller are turned over during turnover, which facilitates the turnover of the seamless stainless steel pipe and improves production efficiency; when the seamless stainless steel pipe is transferred from the shape correcting support roller, the shape correcting support pipe can be transferred by counterclockwise turning over, and the operation is simple and convenient, and the production efficiency is high.

Description

Technical Field

[0001] This invention relates to the technical field of seamless stainless steel pipe manufacturing, and in particular to a seamless stainless steel pipe and its cold rolling process. Background Technology

[0002] Seamless stainless steel pipe is a long strip of steel with a hollow cross-section and no seams around its perimeter. With the rapid growth of the national economy, the application of seamless stainless steel pipe has become increasingly widespread, appearing more and more in urban residential buildings, public buildings, and agricultural production projects. In particular, seamless stainless steel pipe is used in many aspects of agricultural production, such as hydroponics and aquaculture. Based on international application experience, thin-walled stainless steel pipe is recognized as one of the best-performing pipe materials in terms of overall performance among metal pipes.

[0003] Chinese Patent Application Publication No. CN 113263071 A, Publication Date: August 17, 2021, discloses an efficient and convenient seamless steel pipe production line, including a heating furnace and a shrinking machine, which are spaced apart. A conveying device, a piercing mechanism, and a feeding mechanism are provided between the heating furnace and the shrinking machine. The conveying device includes a first conveying component and a tilting mechanism. The first conveying component, which conveys the steel pipe away from the heating furnace, is horizontally positioned. The tilting mechanism includes a first tilting component and a second tilting component, which are located on opposite sides of the steel pipe conveying direction on the first conveying component. The first tilting component includes a first stop, a first power component, a first flap, and a first elastic component. The first power component, which drives the first stop to rise and fall, is fixed to the first conveying component. The first stop, which limits the steel pipe in the horizontal direction, is located on one side of the steel pipe. The first flap, which pushes the steel pipe towards the first stop, is rotatably connected to the first conveying component. The first stop, which presses down on the end of the first flap, is slidably connected to the first flap. The end of the first flap away from the first stop is tilted upward and positioned... On the side of the steel pipe away from the first stop, a first elastic element for driving the top of the first flip plate to rotate away from the first stop is fixed between the first flip plate and the first conveying assembly. The second flipping assembly has the same structure as the first flipping assembly. The second flipping assembly includes a second stop, a second power element, a second flip plate, and a second elastic element. The second power element for driving the second stop to rise and fall is fixed to the first conveying assembly. The second stop and the second power element are located on the side of the steel pipe opposite to the first flipping assembly and are arranged facing each other. The second flip plate has the same structure as the first flip plate and is symmetrically arranged about the steel pipe conveying direction of the first conveying assembly. The second flip plate and the first flip plate are spaced apart along the length of the steel pipe. The second elastic element for driving the top of the second flip plate to rotate away from the second stop is fixed between the second flip plate and the first conveying assembly. There are two piercing mechanisms. The two piercing mechanisms are located at the ends of the first flipping assembly and the second flipping assembly away from the first conveying assembly, respectively. The feeding mechanism for feeding the steel pipe to the shrinking machine is connected between the feeding end of the piercing mechanism and the shrinking machine. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the existing technology in the processing of seamless stainless steel tubes, which has long turnaround time and low efficiency, and provides a seamless stainless steel tube and its cold rolling process with short turnaround time and high efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a seamless stainless steel pipe, comprising a long straight pipe body, wherein a plurality of drainage holes are provided on the long straight pipe body, and the plurality of drainage holes are arranged in a straight line and at equal intervals.

[0006] The seamless stainless steel pipe of this invention is used in the field of irrigation. Several drainage holes are set on the long straight pipe body to realize segmented drainage. At the same time, the drainage holes are arranged at equal intervals on the same straight line, which makes the design and planning convenient and improves the use effect.

[0007] A cold rolling process for seamless stainless steel pipes includes the following steps:

[0008] S1. Making tube blanks: Steelmaking, rolling round steel, piercing and cold drawing are carried out in sequence to complete the tube blank making;

[0009] S2. Cold rolling of tube blank: The tube blank enters the cold rolling unit for rolling;

[0010] S3. Cold-rolled tube straightening: The cold-rolled tube, after being rolled, enters the straightening rolls to complete the straightening process;

[0011] S4. Transfer and Drilling: The seamless stainless steel pipe completed in step S3 is transferred to the drilling device for drilling.

[0012] The manufacturing process of seamless stainless steel tubes begins with steelmaking, followed by rolling round steel bars using a rolling mill. These round bars are then pierced to create rough tubes, which are cold-drawn to produce the required tube blanks for cold rolling. These tube blanks are then fed into a cold rolling mill for rolling. During rolling, the tube blanks pass through rolls to achieve the specified dimensions of the seamless stainless steel tube. After rolling, the cold-rolled tubes are transferred to straightening rolls for straightening, ensuring the straightness of the seamless stainless steel tube meets requirements. The straightened cold-rolled tubes are then transferred again to a punching device for punching holes of equal spacing, ultimately completing the production of the seamless stainless steel tube.

[0013] Preferably, the cold rolling unit includes a frame, on which a cold rolling roll group and a straightening roll group are arranged side by side and move in opposite directions. A transfer device is provided at the ends of the cold rolling roll group and the straightening roll group. During processing, the billet enters the cold rolling roll group and moves towards the transfer device along the rotation direction of the cold rolling roll group. The transfer device transfers the billet to the straightening roll group for straightening after rolling by the cold rolling roll group. The side-by-side arrangement of the cold rolling roll group and the transfer device at their ends facilitates the transfer of the billet from the cold rolling roll group to the straightening roll group, saving space and facilitating turnover in the production line layout, while also improving production efficiency.

[0014] Preferably, the cold rolling roll assembly includes a cold rolling support roll and a cold rolling power roll. The cold rolling power roll is connected to a rotary motor. The cold rolling support roll and the cold rolling power roll are arranged vertically. The cold rolling power roll is connected to a fixed frame, and the fixed frame is connected to a hydraulic cylinder, which is connected to the machine frame. The cold rolling support roll is mounted on the machine frame, and the cold rolling power roll is connected to a rotary motor. The rotation of the rotary motor drives the cold rolling power roll to rotate, achieving the rolling effect. The fixed frame is M-shaped, and the cold rolling power roll is mounted on the fixed frame. A hydraulic cylinder is connected to the top of the fixed frame. The extension and retraction of the hydraulic cylinder can adjust the gap between the cold rolling support roll and the cold rolling power roll, thereby controlling the rolling dimensions and improving the rolling production efficiency.

[0015] Preferably, the straightening roll assembly includes a straightening support roll and a straightening power roll. A gear set connects the straightening power roll and the cold rolling power roll. The gear set and the straightening power roll are connected to a fixed frame. A swingable support assembly is connected below the straightening support roll. The straightening support roll and the straightening power roll are arranged vertically and are on the same plane. The gear set of the straightening power roll and the cold rolling power roll allows them to rotate in opposite directions. A support assembly is provided below the straightening support roll, and the support assembly can swing. The swinging of the support assembly can transfer the billet on the straightening support roll, shortening the turnaround time and improving production efficiency.

[0016] Preferably, the support assembly includes a support rod and a telescopic cylinder, which are arranged side by side. The support rod is hinged to the straightening support roller, and the extended end of the telescopic cylinder is hinged to the straightening support roller. Since the support rod and the straightening support roller are hinged, and the telescopic end of the telescopic cylinder is hinged to the straightening support roller, when the straightening support roller needs to be flipped, the telescopic cylinder retracts downwards, causing the straightening support roller to flip around the hinge point of the support rod. This allows the straightened tube blank to be transferred off the straightening support roller. This turnover method eliminates the need for the tube to pass through the entire set of straightening rollers, shortening the turnover time and improving production efficiency.

[0017] Preferably, the turnover device includes several outgoing rollers and several incoming rollers. The outgoing rollers and incoming rollers are arranged side by side, and a fixed plate is provided between them. The opposite ends of the outgoing rollers and incoming rollers are hinged to the fixed plate. The outgoing rollers are connected to the cold rolling roll group, and the incoming rollers are connected to the straightening roll group. The turnover device consists of several outgoing rollers and several incoming rollers. The outgoing rollers are located at the end of the cold rolling roll group and enter the outgoing rollers when the billet comes out of the cold rolling roll group. The incoming rollers are located at the end of the straightening roll group and can guide the billet from the turnover device to the straightening roll group. A fixed plate is provided between the outgoing rollers and incoming rollers, and both the outgoing rollers and incoming rollers are hinged to the fixed plate. During turnover, both the outgoing rollers and incoming rollers flip inward, so that the billet on the outgoing roller rolls rolls out of the outgoing rollers and rolls into the incoming rollers, completing the turnover. This turnover method is simple to operate, shortens the turnover time, and improves production efficiency.

[0018] Preferably, a bidirectional telescopic cylinder is connected below the fixed plate, and supporting inclined blocks are provided below both the export roller and the import roller. Lifting inclined blocks are connected to both ends of the bidirectional telescopic cylinder, with the supporting inclined blocks corresponding to the lifting inclined blocks. The bidirectional telescopic cylinder is positioned below the fixed plate, with supporting inclined blocks below the export roller and the import roller. Lifting inclined blocks are connected to both telescopic ends of the bidirectional telescopic cylinder. The inclined surfaces of the supporting inclined blocks contact the inclined surfaces of the lifting inclined blocks. When the telescopic ends of the bidirectional telescopic cylinder retract, the lifting inclined blocks and supporting inclined blocks slide relative to each other. Due to the inclined surfaces, the export roller and the import roller flip, causing the tube blank on the export roller to roll off and into the import roller. This turnover method facilitates the export and import of tube blanks, saves turnover time, and improves production efficiency.

[0019] Preferably, the slope of the lifting sloping block located below the export roller is greater than that of the lifting sloping block located below the import roller. The slope of the lifting sloping block corresponding to the export roller is greater than that of the lifting sloping block corresponding to the export roller. This structural design ensures that the flipping angle of the export roller when it flips is greater than that of the import roller when it flips. That is, during turnover, the export roller can quickly move the billet from the export roller into the import roller, completing the turnover, resulting in shorter turnover time and higher production efficiency.

[0020] Preferably, a punching platform is provided on one side of the straightening roller assembly. The punching platform has a guide slope, and a limit hole is provided below the guide slope. The sidewall of the limit hole has several evenly arranged guide grooves. A limit block is slidably connected within the guide grooves. The end of the limit block is arc-shaped, and a retractable drill bit is provided within the arc-shaped surface of the limit block. The punching platform on the side of the straightening roller assembly, with its guide slope, facilitates the transfer of the tube blank.

[0021] The beneficial effects of this invention are as follows: The cold rolling unit adopts a parallel arrangement of cold rolling rolls and straightening rolls, which facilitates turnover, equipment layout, and process flow design, reduces turnover time, and increases production efficiency; the turnover device is placed at one end of the cold rolling rolls and straightening rolls, which facilitates turnover and improves production efficiency; during turnover, the guide roll and guide roll flip, which facilitates the turnover of seamless stainless steel tubes and improves production efficiency; when the seamless stainless steel tube is transferred from the straightening support roll, the straightening support tube can be transferred by flipping counterclockwise, which is simple and convenient to operate and has high production efficiency; by sliding the limiting block in the guide groove, and with the end of the limiting block being arc-shaped, the seamless stainless steel tube can be limited and positioned, and a retractable drill bit can be used to drill holes in the seamless stainless steel tube to complete the processing of the seamless stainless steel tube, ensuring production efficiency. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 These are the main views of latch one and latch two in this invention;

[0024] Figure 3 This is a side view of the latch in this invention;

[0025] Figure 4 This is a cross-sectional view of the connection between the locking block and the guide block in this invention;

[0026] Figure 5 This is a cross-sectional view showing the connection between the locking block and the second locking block in this invention;

[0027] Figure 6 This is a cross-sectional view of the connection between the push block and the locking top block in this invention.

[0028] Attached Figure

[0029] 1. Long straight tube body; 2. Drainage hole; 3. Frame; 4. Cold rolling roll group; 5. Straightening roll group; 6. Turnover device; 7. Drilling table; 40. Cold rolling support roll; 41. Cold rolling power roll; 42. Rotary motor; 43. Fixing frame; 44. Hydraulic cylinder; 50. Straightening support roll; 51. Straightening power roll; 52. Gear set; 53. Support rod; 54. Telescopic cylinder one; 60. Outgoing roll; 61. Incoming roll; 62. Fixing plate; 63. Bidirectional telescopic cylinder; 64. Supporting inclined block; 65. Lifting inclined block; 70. Guide inclined surface; 71. Limiting hole; 72. Guide groove; 73. Limiting block; 74. Drill bit. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components illustrated in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0034] Example 1, as Figure 1 As shown, a seamless stainless steel pipe includes a long straight pipe body 1. The long straight pipe body 1 is provided with a plurality of drainage holes 2, which are arranged in a straight line and at equal intervals.

[0035] Example 2: A cold rolling process for seamless stainless steel tubes, the steps of which are as follows:

[0036] S1. Making tube blanks: Steelmaking, rolling round steel, piercing and cold drawing are carried out in sequence to complete the tube blank making;

[0037] S2. Cold rolling of tube blank: The tube blank enters the cold rolling unit for rolling;

[0038] S3. Cold-rolled tube straightening: The cold-rolled tube, after being rolled, enters the straightening rolls to complete the straightening process;

[0039] S4. Transfer and Drilling: The seamless stainless steel pipe completed in step S3 is transferred to the drilling device for drilling.

[0040] The cold rolling unit includes a frame 3. A cold rolling roll group 4 and a straightening roll group 5 are mounted on the frame 3. The cold rolling roll group 4 and the straightening roll group 5 are arranged side-by-side and move in opposite directions. A transfer device 6 is provided at the ends of the cold rolling roll group 4 and the straightening roll group 5.

[0041] The cold rolling roll assembly 4 includes a cold rolling support roll 40 and a cold rolling power roll 41. The cold rolling power roll 41 is connected to a rotating motor 42. The cold rolling support roll 40 and the cold rolling power roll 41 are arranged vertically. The cold rolling power roll 41 is connected to a fixed frame 43. The fixed frame 43 is connected to a hydraulic cylinder 44. The hydraulic cylinder 44 is connected to the frame 3.

[0042] The straightening roll assembly 5 includes a straightening support roll 50 and a straightening power roll 51. A gear set 52 connects the straightening power roll 51 to the cold rolling power roll 41. The gear set 52 and the straightening power roll 51 are connected to the fixed frame 43. A swingable support assembly is connected below the straightening support roll 50.

[0043] The support assembly includes a support rod 53 and a telescopic cylinder 54. The support rod 53 and the telescopic cylinder 54 are arranged side by side. The support rod 53 is hinged to the straightening support roller 50. The extended end of the telescopic cylinder 54 is hinged to the straightening support roller 50.

[0044] The turnover device 6 includes several outgoing rollers 60 and several incoming rollers 61. The outgoing rollers 60 and incoming rollers 61 are arranged side by side, and a fixing plate 62 is provided between them. The opposite ends of the outgoing rollers 60 and incoming rollers 61 are hinged to the fixing plate 62. The outgoing rollers 60 are connected to the cold rolling roll group 4. The incoming rollers 61 are connected to the straightening roll group 5.

[0045] A bidirectional telescopic cylinder 63 is connected below the fixed plate 62. Supporting inclined blocks 64 are provided below both the guide roller 60 and the guide roller 61. Lifting inclined blocks 65 are connected to both ends of the bidirectional telescopic cylinder 63. The supporting inclined blocks 64 correspond to the lifting inclined blocks 65.

[0046] The slope of the lifting block 65 located below the export roller 60 is greater than the slope of the lifting block 65 located below the import roller 61.

[0047] A punching platform 7 is provided on one side of the straightening roller assembly 5. The punching platform 7 is provided with a guide slope 70. A limiting hole 71 is provided below the guide slope 70. Several evenly arranged guide grooves 72 are provided on the side wall of the limiting hole 71. A limiting block 73 is slidably connected in the guide groove 72. The end of the limiting block 73 is arc-shaped. A retractable drill bit 74 is provided in the arc-shaped surface of the limiting block 73.

[0048] The working principle of this invention is as follows: First, a tube blank is produced through steelmaking, rolling of round steel, piercing, and cold drawing processes. The completed tube blank is then fed into a cold rolling mill, which includes a cold rolling roll group 4 and a straightening roll group 5. The cold rolling roll group 4 includes a cold rolling support roll 40 and a cold rolling power roll 41. The cold rolling support roll 40 is connected to a frame 3, and the cold rolling power roll 41 is positioned above the cold rolling support roll 40 and on the same plane. The cold rolling power roll 41 is connected to a fixed frame 43 and is connected to a rotating motor, which is also connected to the fixed frame 43. The fixed frame 43 has an M-shaped structure. The straightening roll group 5 consists of a straightening support roll 50 and a straightening power roll 51, which are arranged vertically. The straightening power roll 51 is mounted on the fixed frame 43. A gear set 52 connects the cold rolling power roll 41 and the straightening power roll 51. The gear set 52 in the gearbox causes the cold rolling power roll 41 and the straightening power roll 51 to rotate in opposite directions, so that the rotation direction of the cold rolling roll group 4 is opposite to that of the straightening roll group 5. A straightening support roll 50 is provided below the straightening roll group 5. A support rod 53 and a telescopic cylinder 54 are provided below the straightening support roll 50. Both the support rod 53 and the telescopic cylinder 54 are hinged to the lower part of the straightening support roll 50. When the telescopic cylinder 54 retracts, the straightening support roll 50 can flip along the hinge point between the support rod 53 and the straightening support roll 50, and move the seamless stainless steel tube on the straightening support roll 50 to the punching table 7 provided next to it.

[0049] A turnover device 6 is provided at the ends of the cold rolling roll group 4 and the straightening roll group 5. The turnover device 6 includes several guide rolls 60 and several guide rolls 61, wherein the guide rolls 60 are connected to the ends of the cold rolling roll group 4, and the guide rolls 61 are connected to the ends of the straightening roll group 5. A fixing plate 62 is provided between the guide rolls 60 and the guide rolls 61, and the fixing plate 62 is connected to the frame 3. The guide rolls 60 and the guide rolls 61 are respectively hinged to the fixing plate 62. Below the fixing plate 62, a bidirectional telescopic cylinder 63 is provided, and each of the two telescopic ends of the bidirectional telescopic cylinder 63 is connected to a lifting inclined block 65. Meanwhile, a support inclined block 64 is provided below the export roller 60 and the import roller 61. The inclined angle of the lifting inclined block 65 located below the export roller 60 is greater than that of the lifting inclined block 65 located below the import roller 61. When the bidirectional telescopic cylinder 63 retracts, the flip angle of the export roller 60 is greater than that of the import roller 61, which facilitates the tube blank to be rotated out from the export roller 60 and into the import roller 61.

[0050] During cold rolling, the tube blank enters from the inlet end of the cold rolling roll group 4 and is rolled by several sets of cold rolling rolls 4 to complete the cold rolling operation. The cold rolling dimensions are controlled by adjusting the extension length of the hydraulic cylinder. After cold rolling, the tube blank moves out from the outlet end of the cold rolling roll group 4 and enters the guide roll 60 of the turnover device 6. When the seamless stainless steel tube is fully inside the guide roll 60, the bidirectional telescopic cylinder 63 retracts, pulling the lifting inclined block 65 to slide relative to the supporting inclined block 64, causing the guide roll 60 and the guide roll 61 to flip. During the flipping, the seamless stainless steel tube on the guide roll 60 rolls off the guide roll 60 and enters the guide roll 61. After turnover, the bidirectional telescopic cylinder 63 extends outward, and the lifting inclined block 65 moves to the far end, causing the supporting inclined block 64 to slide relative to the guide roll 61. Block 64, along with the guide roller 60 and the guide roller 61, falls. Both the guide roller 60 and the guide roller 61 are connected to a rotating device. Driven by this rotating device, the seamless stainless steel tube on the guide roller 61 is fed into the straightening roller group 5. Since the cold rolling roller group 4 and the straightening roller group 5 are arranged side-by-side, and the cold rolling power roller 41 on the cold rolling roller group 4 and the straightening power roller 51 on the straightening roller group 5 are linked by a gear set 52, they rotate in opposite directions. This allows the seamless stainless steel tube exiting the cold rolling roller group 4 to pass through the turnover device 6 before entering the straightening roller group 5 to complete the straightening operation. After the seamless stainless steel tube has been straightened, the straightening support roller flips over, transferring the seamless stainless steel tube.

[0051] A drilling platform 7 is provided on the side of the straightening roller group 5. The drilling platform 7 has a guide slope 70, and a limiting hole 71 is provided below the guide slope 70. A guide groove 72 is provided on the side wall of the limiting hole 71, and a limiting block 73 is provided within the guide groove 72. A telescopic cylinder is connected to the limiting block 73. The telescopic movement of the telescopic cylinder causes the limiting block 73 to slide within the guide groove 72, thus limiting and fixing the seamless steel pipe. The end of the limiting block 73 is arc-shaped, and the arc surface of the limiting block 73 has the same curvature as the seamless stainless steel pipe, ensuring the limiting effect. A connecting hole is provided on the arc surface of the limiting block 73, and a drill bit 74 is provided within the connecting hole. The drill bit 74 is connected to a telescopic device. The telescopic movement of the telescopic device causes the drill bit 74 to feed within the connecting hole, thus drilling the seamless stainless steel pipe.

[0052] The working steps of the cold rolling device of the present invention are as follows: the billet enters from the inlet end of the cold rolling roll group 4 for cold rolling. After completion, the seamless stainless steel tube enters the output roll 60 of the turnover device 6. Then the output roll 60 and the input roll 61 are flipped to transfer the seamless stainless steel tube into the input roll 61. The seamless stainless steel tube is transferred into the straightening roll group 5 through the input roll 61 for straightening. After the seamless stainless steel tube is straightened, the straightening support roll 50 is flipped to transfer the seamless stainless steel tube into the limiting hole 71 of the punching table 7 on one side. The limiting block 73 slides along the guide groove 72 to fix and limit the seamless stainless steel tube. The drill bit 74 punches holes in the seamless stainless steel tube to complete the cold rolling, straightening and punching operation of the seamless stainless steel tube and complete the production of the seamless stainless steel tube.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cold rolling process for seamless stainless steel pipes, characterized in that, It includes a long straight pipe (1), on which a plurality of drainage holes (2) are provided, the plurality of drainage holes (2) being arranged in a straight line and at equal intervals; the process steps are as follows, S1. Making tube blanks: Steelmaking, rolling round steel, piercing and cold drawing are carried out in sequence to complete the tube blank making; S2. Cold rolling of tube blank: The tube blank enters the cold rolling unit for rolling; S3. Cold-rolled tube straightening: The cold-rolled tube, after being rolled, enters the straightening rolls to complete the straightening process; S4. Transfer and Drilling: The seamless stainless steel tube completed in step S3 is transferred to the drilling device for drilling. The cold rolling device includes a frame (3), on which a cold rolling roll group (4) and a straightening roll group (5) are arranged. The cold rolling roll group (4) and the straightening roll group (5) are arranged side by side and move in opposite directions. A turnover device (6) is provided at the ends of the cold rolling roll group (4) and the straightening roll group (5). A punching table (7) is provided on one side of the straightening roll group (5). A guide slope (70) is provided on the punching table (7). A limit hole (71) is provided below the guide slope (70). A number of evenly arranged guide grooves (72) are provided on the side wall of the limit hole (71). A limit block (73) is slidably connected in the guide groove (72). The end of the limit block (73) is arc-shaped. A retractable drill bit (74) is provided in the arc surface of the limit block (73).

2. The cold rolling process for a seamless stainless steel tube according to claim 1, characterized in that, The cold rolling roll group (4) includes a cold rolling support roll (40) and a cold rolling power roll (41). The cold rolling power roll (41) is connected to a rotating motor (42). The cold rolling support roll (40) and the cold rolling power roll (41) are arranged vertically. The cold rolling power roll (41) is connected to a fixed frame (43). The fixed frame (43) is connected to a hydraulic cylinder (44). The hydraulic cylinder (44) is connected to the frame (3).

3. The cold rolling process for a seamless stainless steel tube according to claim 2, characterized in that, The straightening roller assembly (5) includes a straightening support roller (50) and a straightening power roller (51). A gear set (52) is connected between the straightening power roller (51) and the cold rolling power roller (41). The gear set (52) and the straightening power roller (51) are connected to a fixed frame (43). A swingable support assembly is connected below the straightening support roller (50).

4. The cold rolling process for a seamless stainless steel tube according to claim 3, characterized in that, The support assembly includes a support rod (53) and a telescopic cylinder (54). The support rod (53) and the telescopic cylinder (54) are arranged side by side. The support rod (53) is hinged to the orthopedic support roller (50). The extended end of the telescopic cylinder (54) is hinged to the orthopedic support roller (50).

5. The cold rolling process for a seamless stainless steel tube according to claim 1, characterized in that, The turnover device (6) includes several outgoing rollers (60) and several incoming rollers (61). The outgoing rollers (60) and the incoming rollers (61) are arranged side by side and a fixed plate (62) is provided between the outgoing rollers (60) and the incoming rollers (61). The opposite ends of the outgoing rollers (60) and the incoming rollers (61) are hinged to the fixed plate (62). The outgoing rollers (60) are connected to the cold rolling roll group (4), and the incoming rollers (61) are connected to the straightening roll group (5).

6. The cold rolling process for a seamless stainless steel tube according to claim 5, characterized in that, A bidirectional telescopic cylinder (63) is connected below the fixed plate (62). Supporting inclined blocks (64) are provided below both the outlet roller (60) and the inlet roller (61). Lifting inclined blocks (65) are connected to both ends of the bidirectional telescopic cylinder (63). The supporting inclined blocks (64) and the lifting inclined blocks (65) correspond to each other.

7. The cold rolling process for a seamless stainless steel tube according to claim 6, characterized in that, The slope of the lifting block (65) located below the export roller (60) is greater than the slope of the lifting block (65) located below the import roller (61).

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