Steel pipe cold reaming device and reaming method

Abstract

The invention discloses a steel pipe cold chambering device and a chambering method, relates to the technical field of steel pipe machining, and aims to solve the problem of low production efficiency caused by the fact that a steel pipe is easy to bend and needs to be straightened subsequently in an existing cold chambering process. The device comprises a clamp mechanism, a lining core, a core expanding rod mechanism, a core expanding rod baffle plate, an oil cylinder mechanism and a V-shaped material rack, the core expanding rod mechanism comprises a core expanding nut, a core expanding die, a core expanding rod, a core expanding rod trolley and a connecting nut; the oil cylinder mechanism comprises two oil cylinders and a push plate. Through the innovative design of core expanding die fixing and steel pipe movement, the hydraulic push plate and clamp mechanism cooperative control system is combined, and the hole expanding function is achieved. According to the device, by optimizing the stress direction and the movement mode, the steel pipe is effectively prevented from being bent, the straightening procedure is omitted, and the production efficiency is remarkably improved. The broaching method comprises the steps of steel pipe positioning, core broaching die installation, steel pipe movement driven by the oil cylinder, cooperative operation of the clamp mechanism and the like, the process is simple, and reliability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe processing, and in particular to a cold expanding device and method for steel pipes, which are applicable to high-precision cold expanding processing of seamless steel pipes. Background Art

[0002] The existing cold expanding process uses a method of moving the expanding mandrel and fixing the steel pipe, which easily causes the steel pipe to bend and requires subsequent straightening, resulting in low efficiency and high cost. Therefore, it is necessary to design a cold expanding device and method for steel pipes to fundamentally eliminate the bending defects generated during the cold expanding process of steel pipes and improve production efficiency. Summary of the Invention

[0003] Object of the present invention: Aiming at the deficiencies of the prior art, the present invention provides a cold expanding device and method for steel pipes. Through the innovative design of fixing the expanding mandrel and moving the steel pipe, combined with the coordinated control system of the hydraulic push plate and the clamp mechanism, the cold expanding function is realized, and the problems in the above background art that the cold expanding process easily causes the steel pipe to bend, requires subsequent straightening, has low efficiency and high cost are solved.

[0004] Technical solution of the present invention: On the one hand, the present invention provides a cold expanding device for steel pipes, which includes a clamp mechanism, a lining core, an expanding rod mechanism, an expanding rod baffle, an oil cylinder mechanism and a V-shaped material rack; the clamp mechanism is arranged at the left end of the V-shaped material rack and realizes left and right movement and jaw opening and closing through a chain mechanical system; the lining core is used to support the inner wall of the expanding end of the steel pipe; the expanding rod mechanism consists of an expanding nut, an expanding die, an expanding rod, an expanding rod trolley and a connecting nut, and the expanding rod is fixed to the expanding rod trolley through the connecting nut and moves synchronously with it; the expanding rod baffle is fixed to the base and is used to limit the end point of the stroke of the expanding rod; the oil cylinder mechanism includes two parallel oil cylinders and a push plate, and the push plate is fixedly connected to the piston rod of the oil cylinder and is used to drive the steel pipe to move leftward; the V-shaped material rack can be adjusted in height and is used to support the steel pipe to be cold expanded.

[0005] Further, the two oil cylinders are synchronously driven by a hydraulic system, and their cylinder bodies are fixed to the base, and the piston rods are rigidly connected to the push plate to realize the two-way precise displacement of the push plate.

[0006] Further, the expanding rod trolley is driven by a chain system, moves left and right along the base track, and is equipped with an automatic stop function.

[0007] Further, the clamp mechanism is linked with the oil pressure system, and the clamping force of the jaws is adjustable, and the clamping range is 10 ± 2 cm at the left end of the steel pipe.

[0008] Further, the lifting adjustment range of the V-shaped material rack is adapted to the steel pipe diameter of 114 - 325 mm, and the center line alignment error ≤ 3 mm.

[0009] On the other hand, the present invention provides a method for reaming holes using the steel pipe cold reaming hole device described in any one of the above, which includes the following steps:

[0010] Step 1: Place the steel pipe on the V-shaped material rack, and retract the piston rod of the oil cylinder to the right extreme position;

[0011] Step 2: Adjust the height of the V-shaped material rack to align the steel pipe with the center line of the reaming core rod;

[0012] Step 3: Drive the reaming core rod trolley to move left to the reaming core rod baffle, ensuring that the exposed length of the left end of the reaming core rod meets the installation requirements of the reaming die and the reaming nut;

[0013] Step 4: Install the reaming die and the reaming nut on the left end of the reaming core rod in sequence;

[0014] Step 5: Start the oil cylinder, push the steel pipe to move left, so that the reaming die enters the inner hole of the steel pipe by 20 ± 2 cm;

[0015] Step 6: Install the lining core to the left end of the steel pipe, ensuring that its left end face is flush with the left port of the steel pipe;

[0016] Step 7: Drive the clamp mechanism to move right and clamp the left end of the steel pipe by 10 ± 2 cm, and move left in the reverse direction to complete the reaming;

[0017] Step 8: Release the clamp, and remove the lining core and the steel pipe.

[0018] Advantages of the present invention: Compared with the prior art, the advantages of the present invention are:

[0019] 1. After reaming, the straightness of the steel pipe meets the GB / T 3639-2021 standard, without the need for a straightening process, and the production efficiency is increased by more than 30%;

[0020] 2. The device has strong compatibility and can process steel pipes with an outer diameter of 114 - 325 mm and a wall thickness of 5 - 30 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic top view structure diagram of the steel pipe cold reaming hole device of the present invention;

[0022] In the figure: 1 - clamp mechanism; 2 - lining core; 3 - reaming nut; 4 - reaming die; 5 - reaming core rod; 6 - reaming core rod trolley; 7 - connecting nut; 8 - reaming core rod baffle; 9 - oil cylinder; 10 - push plate; 11 - steel pipe; 12 - V-shaped material rack. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "left", "right", "upper", "lower", "center line", "height", "length", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0025] Refer to Figure 1 , an embodiment provided by the present invention is as follows:

[0026] The present invention provides a steel pipe cold expanding hole device, which includes a clamp mechanism 1, a lining core 2, an expanding core rod mechanism, an expanding core rod baffle 8, an oil cylinder mechanism and a V-shaped material rack 12; the clamp mechanism 1 is arranged at the left end of the V-shaped material rack 12 and realizes left and right movement and jaw opening and closing through a chain mechanical system; the lining core 2 is used to support the inner wall of the expanding hole end of the steel pipe; the expanding core rod mechanism is composed of an expanding core nut 3, an expanding core die 4, an expanding core rod 5, an expanding core rod trolley 6 and a connecting nut 7, and the expanding core rod 5 is fixed to the expanding core rod trolley 6 through the connecting nut 7 and moves synchronously with it; the expanding core rod baffle 8 is fixed to the base and is used to define the end point of the stroke of the expanding core rod; the oil cylinder mechanism includes two parallel oil cylinders 9 and a push plate 10, and the push plate 10 is fixedly connected to the piston rod of the oil cylinder 9 and is used to drive the steel pipe to move leftward; the V-shaped material rack 12 can be adjusted in height and is used to support the steel pipe 11 to be expanded.

[0027] In one embodiment, the two oil cylinders) are synchronously driven by a hydraulic system, and their cylinder bodies are fixed to the base, and the piston rods are rigidly connected to the push plate 10 to realize the two-way precise displacement of the push plate.

[0028] In one embodiment, the expanding core rod trolley 6 is driven by a chain system, moves left and right along the base track, and is configured with an automatic stop function.

[0029] In one embodiment, the clamp mechanism 1 is linked with the oil pressure system, the clamping force of the jaws is adjustable, and the clamping range is 10 ± 2 cm at the left end of the steel pipe.

[0030] In one embodiment, the lifting adjustment range of the V-shaped material rack 12 is adapted to the steel pipe diameter of 114 - 325 mm, and the center line alignment error ≤ 3 mm.

[0031] The present invention also provides a method for expanding a steel pipe cold expanding hole device, which includes the following steps:

[0032] Step 1: Place the steel pipe 11 on the V-shaped material rack 12, and the piston rod of the oil cylinder 9 retracts to the right extreme position;

[0033] Step 2: Adjust the height of the V-shaped material rack 12 to align the center line of the steel pipe 11 with the expanding core rod 5;

[0034] Step 3: Drive the expanding mandrel trolley 6 to move left to the expanding mandrel baffle 8, and ensure that the exposed length of the left end of the expanding mandrel 5 meets the installation requirements of the expanding die 4 and the expanding nut 3;

[0035] Step 4: Install the expanding die 4 and the expanding nut 3 on the left end of the expanding mandrel 5 in sequence;

[0036] Step 5: Start the oil cylinder 9, push the steel pipe 11 to move left, and make the expanding die 4 enter the inner hole of the steel pipe 11 by 20 ± 2 cm;

[0037] Step 6: Install the lining core 2 at the left end of the steel pipe 11, and ensure that its left end face is flush with the left port of the steel pipe 11;

[0038] Step 7: Drive the clamp mechanism 1 to move right and clamp the left end of the steel pipe 11 by 10 ± 2 cm, and move left in the reverse direction to complete the hole expansion;

[0039] Step 8: Release the clamp, and remove the lining core 2 and the steel pipe 11.

[0040] As mentioned above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A cold expanding hole device for steel pipes, characterized in that It includes a clamp mechanism (1), a lining core (2), an expanding core rod mechanism, an expanding core rod baffle (8), an oil cylinder mechanism and a V-shaped material rack (12); the clamp mechanism (1) is arranged at the left end of the V-shaped material rack (12) and realizes left and right movement and jaw opening and closing through a chain mechanical system; the lining core (2) is used to support the inner wall of the expanded end of the steel pipe; the expanding core rod mechanism consists of an expanding core nut (3), an expanding core die (4), an expanding core rod (5), an expanding core rod trolley (6) and a connecting nut (7), and the expanding core rod (5) is fixed to the expanding core rod trolley (6) through the connecting nut (7) and moves synchronously with it; The expanding core rod baffle (8) is fixed to the base and is used to define the end point of the stroke of the expanding core rod; the oil cylinder mechanism includes two parallel oil cylinders (9) and a push plate (10), and the push plate (10) is fixedly connected to the piston rod of the oil cylinder (9) and is used to drive the steel pipe to move leftward; The V-shaped material rack (12) can be adjusted in height and is used to support the steel pipe (11) to be expanded.

2. The cold expanding hole device for steel pipes according to claim 1, characterized in that, The two oil cylinders (9) are synchronously driven by a hydraulic system, and their cylinder bodies are fixed to the base, and the piston rods are rigidly connected to the push plate (10) to realize the two-way precise displacement of the push plate.

3. The cold expanding hole device for steel pipes according to claim 1, characterized in that, The expanding core rod trolley (6) is driven by a chain system, moves left and right along the base track, and is configured with an automatic stop function.

4. A steel pipe cold expanding hole device according to claim 1, characterized in that, The clamp mechanism (1) is linked with the oil pressure system, and the clamping force of the jaws is adjustable, and the clamping range is 10±2 cm at the left end of the steel pipe.

5. A steel pipe cold expanding hole device according to claim 1, characterized in that The lifting adjustment range of the V-shaped material rack (12) is adapted to the steel pipe diameter of 114-325 mm, and the center line alignment error ≤ 3 mm.

6. A cold expanding hole method for steel pipes based on the device according to any one of claims 1-5, characterized in that, It includes the following steps: Step 1: Place the steel pipe (11) on the V-shaped material rack (12), and the piston rod of the oil cylinder (9) retracts to the right extreme position; Step 2: Adjust the height of the V-shaped material rack (12) so that the center lines of the steel pipe (11) and the expanding core rod (5) are aligned; Step 3: Drive the expanding core rod trolley (6) to move leftward to the expanding core rod baffle (8) to ensure that the exposed length of the left end of the expanding core rod (5) meets the installation requirements of the expanding core die (4) and the expanding core nut (3); Step 4: Install the expanding core die (4) and the expanding core nut (3) on the left end of the expanding core rod (5) in sequence; Step 5: Start the oil cylinder (9) to push the steel pipe (11) to move leftward so that the expanding core die (4) enters the inner hole of the steel pipe (11) by 20±2 cm; Step 6: Install the lining core (2) to the left end of the steel pipe (11) to ensure that its left end face is flush with the left port of the steel pipe (11); Step 7: Drive the clamp mechanism (1) to move rightward and clamp the left end of the steel pipe (11) by 10±2 cm, and move leftward in the reverse direction to complete the hole expansion; Step 8: Loosen the clamp and remove the lining core (2) and the steel pipe (11).

Images