A positioning device for tube blank piercing

Abstract

This invention discloses a positioning device for piercing tube blanks, including a tube blank, a receiving trough, and a positioning assembly. The positioning assembly includes a pusher, a guide plate, rollers, a conical mandrel, and a horizontally placed hub. Under the pusher, the tube blank enters the rollers and undergoes a slight diameter reduction process. The tube blank then enters the hub and is tangent to the hub. The upper end of the mandrel near the conical mandrel is tangent to the hub, while the lower end of the mandrel away from the conical mandrel is connected to a mandrel carriage. The mandrel carriage is equipped with a thrust seat to control the horizontal movement of the mandrel. The mandrel carriage pushes the conical mandrel to the piercing position. Under the action of the rotation source, the hub makes a circumferential motion while driving the tube blank to continue rotating forward. The mandrel carriage controls the thrust seat to slowly retract horizontally. The center of the tube blank and the rolling line of the mandrel always remain at the same horizontal line and will not shift due to vibration, ensuring uniform wall thickness after piercing.

Description

Technical Field

[0001] This invention belongs to the field of steel pipe rolling technology, and specifically relates to a positioning device for piercing tube blanks. Background Technology

[0002] Seamless steel pipe, as the name suggests, is a steel pipe without seams on its surface. It is made from a single piece of metal. In the production process, a solid tube blank or steel ingot is threaded into a hollow tube, and then hot rolling, cold rolling or cold drawing processes are used to make a steel pipe of the required size. Seamless steel pipe is mainly used as oil and geological drilling pipe, cracking pipe for petrochemical industry, boiler tube, and aerospace field.

[0003] In seamless steel pipe production, the piercing process is used to pierce a solid billet into a hollow tube. The entire production process generally includes piercing, rolling, and sizing / reducing. As the first step in metal deformation, piercing produces a tube with a relatively thick wall, short length, and poor inner and outer surface quality; hence, it is called a "burden tube." If defects exist in the bore tube, they are difficult to eliminate or mitigate even in subsequent processes. Therefore, the piercing process plays a crucial role in modern steel pipe production.

[0004] However, in the process of implementing the technical solution of the present application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems: During the piercing process, the tube blank and the mandrel move concentrically. After the tube blank passes through the guide tube, it is first processed by the rollers and then comes into contact with the mandrel. During this process, there is a gap, which causes the tube blank to be partially offset due to vibration during the tube blank conveying process, causing the center of the tube blank to be misaligned with the rolling line of the mandrel, resulting in uneven wall thickness after piercing. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this application provides a positioning device for tube blank piercing, which solves the technical problem in the prior art where vibration during tube blank transportation causes partial displacement, resulting in misalignment between the tube blank center and the mandrel rolling line, leading to uneven wall thickness after piercing.

[0006] This application provides a positioning device for piercing a tube blank, comprising a tube blank, a receiving trough, a pusher, and a positioning assembly. The tube blank is a solid circular tube blank. The front end of the pusher is equipped with a rotatable pusher head, and the rear end of the pusher is equipped with a pinch roller. The pusher is located on one side of the receiving trough. The speed of the pusher can be set to advance at high speed before approaching the roller to save time, and slow down when approaching the roller to adapt to the biting condition of the tube blank. The positioning assembly includes: a guide plate, a roller for biting the tube blank, a mandrel, and a horizontally placed hub. The guide plate has an open circular structure, and the inner diameter of the inlet and outlet ends of the guide plate is equal to the outer diameter of the tube blank. One end is connected to the pusher, the other end of the roll is close to the guide plate and is symmetrically distributed on both sides of the guide plate. The distance between the two rolls is slightly smaller than the outer diameter of the billet. The end of the mandrel is movably connected to the top of the mandrel, and the nose of the mandrel is located at the center line of the roll compression belt. The hub is located between the rolls and the height of the hub is equal to the distance between the rolls. The hub is tangent to the billet and makes a circular motion. The upper end of the mandrel moves concentrically with the billet and is tangent to the hub. The lower end of the mandrel is connected to the mandrel carriage. The mandrel carriage is provided with a thrust seat to control the horizontal movement of the mandrel. The diameter of the mandrel is slightly lower than the height of the hub.

[0007] Preferably, the embodiments of this application also disclose that the wheel hub is concave, and the wheel hub includes a rim disposed on the surface of the wheel hub and a drive shaft disposed at the center of the wheel hub, and the wheel hub is connected to a rotation source through the drive shaft.

[0008] Preferably, the embodiments of this application also disclose that the roll is a two-section barrel roll, and the inlet end and outlet section of the roll are provided with rolling strips.

[0009] Preferably, the present application also discloses a worm gear movably connected to the roll, the worm gear being connected to a drive motor and acting at the roll inlet cone and the roll outlet cone, respectively.

[0010] Preferably, the embodiments of this application also disclose that the mandrel is a conical mandrel, and the conical mandrel is threadedly connected to the mandrel rod.

[0011] Preferably, the present application also discloses a centering roller disposed at the rear end of the top rod and used to fix the top rod. The centering roller includes one upper centering roller and two smaller centering rollers arranged at 120° intervals. The top rod passes through the center of the centering roller.

[0012] The technical solutions provided in this application have at least the following significant technical effects:

[0013] (1) The billet is pushed by the pusher and enters the roll for slight diameter reduction. The billet enters the hub and is tangent to the hub. The upper end of the push rod near the conical head is tangent to the hub, and the lower end of the push rod away from the conical head is connected to the push rod carriage. The push rod carriage is equipped with a thrust seat to control the horizontal movement of the push rod. The push rod carriage pushes the conical head to the position to be pierced. Under the action of the rotation source, the hub makes a circumferential motion and drives the billet to continue to rotate forward. The push rod carriage controls the thrust seat to slowly retreat horizontally. The center of the billet and the rolling line of the head always remain at the same horizontal line and will not be offset due to vibration, so that the wall thickness after piercing is uniform.

[0014] (2) When the billet is not close to the centering roller, the three centering rollers hold the push rod and rotate with it. The function is to make the billet...

[0015] The push rod axis always remains on the rolling line, preventing it from swinging due to bending.

[0016] (3) When the tube blank approaches the centering roller, the upper and lower centering rollers open a certain distance at the same time, so that the tube blank enters between the three centering rollers. The tube then rotates and moves forward in the three centering rollers, which serves as a guide.

[0017] (4) Rollers are provided with rolling strips at the inlet and outlet ends to prevent sharp edges from forming at the junction of the two rolls and the tube blank. Such sharp edges will cause scratches on the outer surface of the tube blank during piercing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure during the perforation of the tube blank in an embodiment of this application.

[0019] The attached diagram is labeled as follows: 1. billet, 2. roll, 3. hub, 4. mandrel, 5. mandrel rod. Detailed Implementation

[0020] This application provides a positioning device for tube blank piercing, solving the technical problem in the prior art where vibration during tube blank transportation causes partial displacement, resulting in misalignment between the tube blank center and the mandrel rolling line, leading to uneven wall thickness after piercing. The overall approach to solving the above problem in this application is as follows:

[0021] Under the pusher, the billet 1 enters the roll 2 for slight diameter reduction. The billet 1 enters the hub 3 and is tangent to the hub 3. The upper end of the push rod 5 near the conical mandrel is tangent to the hub 3, and the lower end of the push rod 5 away from the conical mandrel is connected to the push rod carriage. The push rod carriage is equipped with a thrust seat to control the horizontal movement of the push rod 5. The push rod carriage pushes the conical mandrel to the position to be pierced. Under the action of the rotation source, the hub 3 makes a circumferential motion and drives the billet 1 to continue to rotate forward. The push rod carriage controls the thrust seat to slowly retract horizontally. The center of the billet 1 and the rolling line of the conical mandrel always remain at the same horizontal line and will not be offset due to vibration, so that the wall thickness after piercing is uniform.

[0022] like Figure 1 The embodiment shown in this application provides a positioning device for piercing a tube blank, comprising a tube blank, a receiving trough, a pusher, and a positioning assembly. The tube blank 1 is a solid circular tube blank. The front end of the pusher is equipped with a rotatable pusher head, and the rear end 4 of the pusher is equipped with a pinch roller. The pusher is located on one side of the receiving trough. The positioning assembly includes: a guide plate, a roller 2 for biting into the tube blank 1, a top head 4, and a horizontally placed hub 3. The guide plate has an open circular structure, and the inner diameter of the inlet and outlet ends of the guide plate is equal to the outer diameter of the tube blank 1. One end of the guide plate is connected to the pusher. The roller 2 is located near the other end of the guide plate and is symmetrically distributed on both sides of the guide plate. The distance between the two rollers 2 is slightly smaller than the outer diameter of the tube blank 1. The roller 2 is a two-section barrel-shaped roller, and the inlet and outlet ends of the roller 2 are equipped with rolling strips. It also includes components movably connected to the roller 2. The worm gear is connected to the drive motor and acts at the inlet and outlet ends of the roll 2, respectively. The mandrel 4 is movably connected to the mandrel 5, and the nose of the mandrel 4 is located at the center line of the compression belt of the roll 2. The conical mandrel is threadedly connected to the mandrel. The hub 3 is located between the rolls 2 and the height of the hub 3 is equal to the distance between the rolls 2. The hub 3 is tangent to the tube blank 1 and makes a circular motion. The upper end of the mandrel 5 keeps concentric with the tube blank 1 and is tangent to the hub 3. The lower end of the mandrel 5 is connected to the mandrel carriage. The mandrel carriage is equipped with a thrust seat to control the horizontal movement of the mandrel 5. The diameter of the mandrel 5 is slightly lower than the height of the hub 3. The hub 3 is concave and includes a rim on the surface of the hub 3 and a drive shaft at the center of the hub 3. The hub 3 is connected to the rotation source through the drive shaft.

[0023] It also includes a centering roller located at the rear end of the top rod 5 and used to fix the top rod. The centering roller includes one upper centering roller and two small centering rollers arranged at 120° to each other. The top rod passes through the center of the centering roller.

[0024] Work process:

[0025] The tube blank 1 is placed in the receiving trough for heating and softening. The pinch rollers on the pusher place the softened tube blank 1 into the guide plate. The guide plate closes, and the tube blank 1, pushed by the pusher, enters the roll 2 for slight diameter reduction. The tube blank 1 enters the hub 3 and is tangent to the hub 3. The upper end of the push rod 5 near the conical mandrel is tangent to the hub 3, and the lower end of the push rod 5 away from the conical mandrel is connected to the push rod carriage. The push rod carriage is equipped with a thrust seat to control the horizontal movement of the push rod 5. The push rod carriage pushes the conical mandrel to the position to be pierced. Under the action of the rotation source, the hub 3 makes a circumferential motion, which simultaneously drives the tube blank 1 to continue rotating forward. Okay, the push rod trolley controls the thrust seat to slowly retract horizontally, and the center of the tube blank 1 and the rolling line of the conical mandrel are always kept at the same horizontal line for piercing. When the tube blank 1 is not close to the centering roll, the three centering rolls hold the push rod 5 and rotate with the push rod 5. The function is to keep the axis of the push rod 5 on the rolling line and prevent it from swinging due to bending. When the tube blank 1 is close to the centering roll, the upper and lower centering rolls open a certain distance at the same time, so that the tube blank 1 enters between the three centering rolls. The tube blank 1 rotates and moves forward in the three centering rolls. The piercing is completed, and the lifting roll set below the centering roll transports the tube blank to the next process.

[0026] Although preferred embodiments of the invention have been described, those skilled in the art, once they learn the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0027] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from the spirit and scope of this invention. Therefore, if these modifications and variations of this invention fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A positioning device for piercing tube blanks, wherein, include: Tube blank (1), wherein the tube blank (1) is a solid round tube blank; Receiving trough; A steel pusher, wherein the front end of the steel pusher is provided with a rotatable steel pusher head, the rear end of the steel pusher is provided with a pinch roller, and the steel pusher is located on the receiving side; Positioning component, the positioning component comprising: The guide plate has an open circular structure. The inner diameter of the inlet and outlet ends of the guide plate is equal to the outer diameter of the tube blank (1). One end of the guide plate is connected to the pusher. Rollers (2) for biting into tube blank (1) are located near the other end of the guide plate and are symmetrically distributed on both sides of the guide plate. The distance between the two rollers (2) is slightly smaller than the outer diameter of the tube blank. A mandrel (4) that moves concentrically with the tube blank (1); the end of the mandrel (4) is movably connected to the top of the mandrel (5), and the nose of the mandrel (4) is located at the center line of the compression belt of the roll (2); and a horizontally placed hub (3), the hub (3) being located between the rolls (2) and the height of the hub (3) being equal to the distance between the rolls (2), the hub (3) being tangent to the tube blank (1) and making circular motion, the upper end of the mandrel (5) being tangent to the hub (3), the lower end of the mandrel (5) being connected to the mandrel carriage, the mandrel carriage being provided with a thrust seat for controlling the horizontal movement of the mandrel (5), and the diameter of the mandrel (5) being slightly lower than the height of the hub (3); The hub (3) is concave, and the hub (3) includes a rim disposed on the surface of the hub (3) and a drive shaft disposed at the center of the hub (3). The hub (3) is connected to a rotation source through the drive shaft.

2. The positioning device for piercing tube blanks according to claim 1, wherein, The roll (2) is a two-section barrel roll, and the inlet end and outlet end of the roll (2) are provided with rolling strips.

3. A positioning device for piercing tube blanks according to claim 2, wherein, It also includes a worm gear that is movably connected to the roll (2), the worm gear being connected to a drive motor and acting on the inlet cone and outlet cone of the roll (2), respectively.

4. A positioning device for piercing tube blanks according to claim 1, wherein, The top head (4) is a conical top head, and the conical top head is threadedly connected to the top rod (5).

5. A positioning device for piercing tube blanks according to claim 1, wherein, It also includes a centering roller disposed at the rear end of the top rod (5) and used to fix the top rod (5). The centering roller includes one upper centering roller and two small centering rollers arranged at 120° to each other. The top rod (5) passes through the centering roller.

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