A processing device and method for seamless thin-walled pipe fittings

Abstract

The present invention relates to a processing device for seamless thin-walled pipe fittings, comprising a pipe blank heating furnace, a spiral conical piercing machine, an Accu-Roll rolling mill, and an 8-stand three-roller micro-tension reducing mill; the cone head of the spiral conical piercing machine is arranged close to the Accu-Roll rolling mill, the pipe through holes of the pipe blank heating furnace are arranged horizontally, and the 8-stand three-roller micro-tension reducing mill is provided with four groups of reducing rollers and a rotary pusher; the purpose of the present invention is to solve the technical problem that seamless thin-walled steel pipes cannot be embossed during processing.

Description

Technical Field

[0001] The invention relates to the field of metal processing, and in particular to a processing device and method for a seamless thin-wall pipe fitting. Background Art

[0002] In the prior art, seamless thin-walled steel pipes are made by perforating steel ingots or solid tubes into rough tubes, and then hot-rolled, cold-rolled or cold-drawn. In many cases where seamless thin-walled steel pipes need to be embedded in structures, the smooth outer wall of the seamless thin-walled steel pipes makes it impossible for gel materials to be firmly connected to the outer wall of the seamless thin-walled steel pipes. Therefore, the outer wall of the seamless thin-walled steel pipe needs to be provided with patterns to improve the surface adhesion between the gel material and the seamless thin-walled steel pipes. However, the existing seamless thin-walled steel pipes cannot be provided with patterns during the processing, whether hot-rolled, cold-rolled or cold-drawn. Embossing is required after the seamless thin-walled steel pipes are processed. This process requires a lot of equipment, is time-consuming, costly and labor-intensive, and greatly reduces the processing efficiency of seamless thin-walled steel pipes with patterns.

[0003] Therefore, it is an urgent problem to develop a processing device for seamless thin-walled pipe fittings that can solve the technical problem that seamless thin-walled steel pipes cannot be embossed during processing. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a processing device for seamless thin-walled pipe fittings, which is specifically implemented by the following technical solutions:

[0005] A processing device for seamless thin-walled pipe fittings, comprising a tube heating furnace, a spiral conical piercing machine, an Accu-Roll rolling mill, and an 8-stand three-roller micro-tension reducing mill; the tube holes of the tube heating furnace are arranged horizontally, and the tubes are heated when they pass through the tube holes from one side of the tube heating furnace to the other side; the cone head of the spiral conical piercing machine is arranged close to the Accu-Roll rolling mill, and after the tubes are heated out of the tube heating furnace, they are first processed by the Accu-Roll rolling mill and then immediately enter the spiral conical piercing machine, and the cone head of the spiral conical piercing machine performs piercing, and passes through the Accu-Roll rolling mill. The tube blanks of the ccu-Roll rolling mill and the spiral cone piercing machine are finally formed into seamless thin-walled pipe fittings with spiral outer walls; the 8-frame three-roller micro-tension reducing mill is provided with four groups of reducing rollers and a rotary pusher, the four groups of reducing rollers are arranged side by side and their axes are spaced 280mm apart, each group of reducing rollers is provided with two driving rollers, and the two driving rollers of each group of reducing rollers are arranged up and down, and the axis spacing between the two driving rollers of each group of reducing rollers gradually decreases in the direction from the entrance to the exit of the reducing rollers, and the rotary pusher is used to fix the seamless thin-walled pipe fittings, drive the seamless thin-walled pipe fittings to rotate and push them into the entrance of the reducing rollers for reducing the diameter.

[0006] Furthermore, a high-frequency heating coil is provided around the tube hole of the tube blank heating furnace, so that the tube blank can quickly pass through the tube hole and be heated to the target temperature.

[0007] Furthermore, the Accu-Roll mill includes a tube rolling hole, a pair of tube rolling rollers are arranged on the upper and lower sides of the tube rolling hole, and the diameter of the tube blank and the maximum outer diameter of the tube rolling rollers are interference fit.

[0008] Furthermore, the tube rolling roller is a shuttle-shaped structure, and a plurality of circular rings are evenly arranged on the surface of the tube rolling roller, and the outer wall of each circular ring is an arc shape. The horizontal angle between the rotating shafts of the upper tube rolling roller and the lower tube rolling roller is 36°, and the bisector of the horizontal angle coincides with the center axis of the tube rolling hole.

[0009] Furthermore, a threaded protrusion is provided on the outer surface of the cone head of the spiral cone punch, and the threaded protrusion corresponds to the thread specification rolled out by the tube rolling roller. The cone head of the spiral cone punch extends to half the depth of the tube rolling hole, and the driving shaft of the cone head of the spiral cone punch coincides with the central axis of the tube rolling hole.

[0010] Furthermore, the rotary propeller includes a fixed shaft, the outer wall of which is provided with a threaded protrusion, which corresponds to the thread specification rolled out by the tube rolling roller. After the fixed shaft completely passes through the hole of the seamless thin-walled pipe fitting, the seamless thin-walled pipe fitting can be fixed.

[0011] Furthermore, the axial distance between the two driving rollers of each set of reducing rollers is adjustable, the horizontal angle between the rotating axes of the upper driving roller and the lower driving roller is 36°, the two driving rollers of each set of reducing rollers rotate in opposite directions at the same speed, and the outer wall of each driving roller is arc-shaped.

[0012] The present invention also provides a method for processing a seamless thin-walled pipe fitting, comprising the following steps:

[0013] A. Tube cutting: Put the tube into the cutting saw and cut it in batches according to the designed tube length;

[0014] B. Heating of tube blanks: Put the cut tube blanks into the pushing mechanism, and push them through the tube holes of the tube blank heating furnace. After heating, they enter the next pushing mechanism and enter the next process.

[0015] C. Piercing of tube blanks: The tube blanks are rotated and pushed into the tube rolling hole of the Accu-Roll rolling mill under the action of the pushing mechanism. The tube rolling rollers on the upper and lower sides of the tube rolling hole rotate in opposite directions at the same speed, pushing the tube blanks to the cone head of the spiral cone punching machine for perforation to form seamless thin-walled tube fittings. After the perforation is completed, the seamless thin-walled tube fittings are separated from the spiral cone punching machine and enter the pushing mechanism to enter the next process;

[0016] D. Heating of seamless thin-walled pipe fittings: The pushing mechanism pushes the initially formed seamless thin-walled pipe fittings through the pipe hole of the pipe blank heating furnace, and after heating, enters the next pushing mechanism to enter the next process;

[0017] E. Reducing the diameter of seamless thin-walled pipe fittings: adjust the axis spacing of each set of reducing rollers according to the designed pipe diameter, and spirally insert the seamless thin-walled pipe fittings into the fixed shaft of the rotary pusher. The rotary pusher drives the fixed shaft to rotate and push it into the entrance of the reducing roller for reducing processing;

[0018] F. Processing of seamless thin-walled pipe fittings is completed: After the diameter reduction, the seamless thin-walled pipe fittings are cooled, cut, inspected with 180mm automatic magnetic leakage flaw detection equipment, tested with 80MPa hydraulic pressure testing machine, measured in length, weighed, sprayed, laser marked, bundled, and finally shipped out.

[0019] After adopting the above technical solution, the beneficial effects of the present invention are:

[0020] 1. In the present invention, a seamless thin-walled steel pipe with a thread can be quickly processed by a high-frequency electromagnetic heating coil, a spiral conical piercing machine, an Accu-Roll rolling mill, and an 8-stand three-roller micro-tension reducing mill, thereby greatly reducing the number of equipment, working hours, and worker input.

[0021] 2. In the present invention, the shuttle-shaped tube rolling roller can roll the tube blank more smoothly. The annular structure on the surface of the tube rolling roller can roll out a threaded pattern on the surface of the tube blank because the axis of the tube rolling roller and the center axis of the tube rolling hole have a certain angle. Since the cone head is also provided with a spiral protrusion, the tube wall of the tube blank can better form a spiral pattern.

[0022] 3. In the present invention, the threaded fixed shaft can make the seamless thin-walled steel pipe rotate along with the fixed shaft without the aid of other limiting mechanisms and will not fall off, making the installation of the seamless thin-walled steel pipe more convenient and improving the processing efficiency of the seamless thin-walled steel pipe.

[0023] 4. In the present invention, the axis of each set of driving rollers forms a certain angle with the central axis of the inlet, and can be rolled along the thread path of the seamless thin-walled steel pipe, ensuring that the pattern of the seamless thin-walled steel pipe is better formed while achieving the diameter reduction processing, greatly improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic structural diagram of a seamless thin-walled pipe processing device provided in an embodiment of the present application.

[0026] Figure 2 A schematic diagram of the structure of a tube blank heating furnace of a seamless thin-walled tube processing device provided in an embodiment of the present application.

[0027] Figure 3 A schematic diagram of the Accu-Roll mill structure of a seamless thin-walled pipe processing device provided in an embodiment of the present application.

[0028] Figure 4 A schematic diagram of the tube rolling roller structure of a seamless thin-walled tube processing device provided in an embodiment of the present application.

[0029] Figure 5 A schematic diagram of the cone head structure of a spiral cone punch of a seamless thin-walled pipe processing device provided in an embodiment of the present application.

[0030] Figure 6 A schematic structural diagram of an 8-stand three-roller micro-tension reducing mill for a seamless thin-walled pipe processing device provided in an embodiment of the present application.

[0031] Figure 7 A schematic diagram of the reducing roller structure of a seamless thin-walled pipe processing device provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 100-tube heating furnace, 101-tube hole, 102-high frequency heating coil, 200-spiral cone piercing machine, 201-cone head, 202-driving shaft, 300-Accu-Roll rolling mill, 301-tube hole, 302-tube roller, 303-ring, 400-8-stand three-roller micro-tension reducing mill, 401-rotating pusher reducing roller, 402-reducing roller, 403-fixed shaft, 404-driving roller. DETAILED DESCRIPTION

[0034] The following description of the embodiments will help the public better understand the present invention, but the specific embodiments given by the applicant cannot and should not be regarded as limitations on the technical solutions of the present invention. Any changes to the definitions of components or technical features, or formal rather than substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solutions of the present invention.

[0035] In this application, unless otherwise clearly specified or limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements, or it can be only surface contact, or surface contact connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The present invention is implemented by the following technical solutions:

[0037] As shown in the figure, a processing device for seamless thin-walled pipe fittings includes a tube heating furnace 100, a spiral conical piercing machine 200, an Accu-Roll rolling mill 300, and an 8-stand three-roller micro-tension reducing mill 400; the tube hole 101 of the tube heating furnace 100 is arranged horizontally, and the tube is heated when it passes through the tube hole 101 from one side of the tube heating furnace 100 to the other side; the cone head 201 of the spiral conical piercing machine 200 is arranged close to the Accu-Roll rolling mill 300, and after the tube is heated out of the tube heating furnace 100, it first passes through the Accu-Roll rolling mill 300 for initial processing and then immediately enters the spiral conical piercing machine 200, and the cone head 201 of the spiral conical piercing machine 200 performs piercing, and then The tube blanks passing through the Accu-Roll rolling mill 300 and the spiral conical piercing machine 200 are finally formed into seamless thin-walled pipe fittings with spiral outer walls; the 8-frame three-roller micro-tension reducing mill 400 is provided with four groups of reducing rollers 402 and a rotary pusher 401, the four groups of reducing rollers 402 are arranged side by side and their axes are spaced 280 mm apart, each group of reducing rollers 402 is provided with two driving rollers 404, the two driving rollers 404 of each group of reducing rollers 402 are arranged up and down, and the axis spacing between the two driving rollers 404 of each group of reducing rollers 402 gradually decreases in the direction from the entrance to the exit of the reducing rollers 402, and the rotary pusher 401 is used to fix the seamless thin-walled pipe fittings, drive the seamless thin-walled pipe fittings to rotate and push them into the entrance of the reducing rollers 402 for reducing.

[0038] With the above arrangement, through the high-frequency electromagnetic heating coil, spiral conical piercing machine 200, Accu-Roll rolling mill 300, and 8-stand three-roller micro-tension reducing mill 400, seamless thin-walled steel pipes with threads can be quickly processed out, which greatly reduces the number of equipment, working hours and worker input.

[0039] As shown in the figure, a high-frequency heating coil 102 is arranged around the tube hole 101 of the tube blank heating furnace 100, and the tube blank can quickly pass through the tube hole 101 and be heated to the target temperature.

[0040] As shown in the figure, the Accu-Roll mill 300 includes a tube rolling hole 301, and a pair of tube rolling rollers 302 are arranged on the upper and lower sides of the tube rolling hole 301. The diameter of the tube blank and the maximum outer diameter of the tube rolling rollers 302 are interference fit.

[0041] As shown in the figure, the tube rolling roller 302 is a shuttle-shaped structure, and a plurality of circular rings 303 are evenly arranged on the surface of the tube rolling roller 302. The outer wall of each circular ring 303 is an arc shape. The horizontal angle between the rotating shafts of the upper tube rolling roller 302 and the lower tube rolling roller 302 is 36°, and the bisector of the horizontal angle coincides with the central axis of the tube rolling hole 301.

[0042] With the above arrangement, the shuttle-shaped tube rolling roller 302 can roll the tube blank more smoothly, and the ring 303 structure on the surface of the tube rolling roller 302 can roll out a threaded pattern on the surface of the tube blank because the axis of the tube rolling roller 302 and the center axis of the tube rolling hole 301 have a certain angle.

[0043] As shown in the figure, the outer surface of the cone head 201 of the spiral cone punch 200 is provided with a threaded protrusion, which corresponds to the thread specification rolled out by the tube rolling roller 302. The cone head 201 of the spiral cone punch 200 extends to half the depth of the tube rolling hole 301, and the drive shaft 202 of the cone head 201 of the spiral cone punch 200 coincides with the central axis of the tube rolling hole 301.

[0044] With the above arrangement, the cone head 201 is provided with a spiral protrusion, so that the tube wall of the tube blank can better form a spiral pattern.

[0045] As shown in the figure, the rotary propeller 401 includes a fixed shaft 403, and the outer wall of the fixed shaft 403 is provided with a threaded protrusion, which corresponds to the thread specification rolled out by the tube rolling roller 302. After the fixed shaft 403 completely passes through the hole of the seamless thin-walled pipe fitting, the seamless thin-walled pipe fitting can be fixed.

[0046] With the above arrangement, the threaded fixed shaft 403 can enable the seamless thin-walled steel pipe to rotate along with the fixed shaft 403 without the aid of other limiting mechanisms and will not fall off, making the installation of the seamless thin-walled steel pipe more convenient and improving the processing efficiency of the seamless thin-walled steel pipe.

[0047] As shown in the figure, the axial distance between the two driving rollers 404 of each set of reducing rollers 402 is adjustable, the horizontal angle between the rotating axes of the upper driving roller 404 and the lower driving roller 404 is 36°, the two driving rollers 404 of each set of reducing rollers 402 rotate in opposite directions at the same speed, and the outer wall of each driving roller 404 is arc-shaped.

[0048] With the above arrangement, the axis of each set of driving rollers 404 forms a certain angle with the central axis of the inlet and can be rolled along the thread path of the seamless thin-walled steel pipe, ensuring better formation of the pattern of the seamless thin-walled steel pipe while achieving diameter reduction processing, greatly improving work efficiency.

[0049] The present invention also provides a method for processing a seamless thin-walled pipe fitting, comprising the following steps:

[0050] A. Tube cutting: Put the tube into the cutting saw and cut it in batches according to the designed tube length;

[0051] B. Heating the tube blank: the cut tube blank is placed in a pushing mechanism, and is pushed by the pushing mechanism to pass through the tube hole 101 of the tube blank heating furnace 100, and after heating, enters the next pushing mechanism to enter the next process;

[0052] C. Piercing of tube blanks: The tube blanks are rotated and pushed into the tube rolling hole 301 of the Accu-Roll rolling mill 300 under the action of the pushing mechanism. The tube rolling rollers 302 on the upper and lower sides of the tube rolling hole 301 rotate in opposite directions at the same speed, pushing the tube blanks to the cone head 201 of the spiral cone punching machine 200 for perforation to form seamless thin-walled tube fittings. After the perforation is completed, the seamless thin-walled tube fittings are separated from the spiral cone punching machine 200 and enter the pushing mechanism to enter the next step;

[0053] D. Heating of seamless thin-walled pipe fittings: The pushing mechanism pushes the initially formed seamless thin-walled pipe fittings through the pipe hole 101 of the pipe blank heating furnace 100, and after heating, the seamless thin-walled pipe fittings enter the next pushing mechanism and enter the next process;

[0054] E. Reducing the diameter of seamless thin-walled pipe fittings: adjusting the axial distance of each set of reducing rollers 402 according to the designed pipe diameter, spirally inserting the seamless thin-walled pipe fittings onto the fixed shaft 403 of the rotating propeller 401, and the rotating propeller 401 drives the fixed shaft 403 to rotate and propel it into the entrance of the reducing roller 402 for reducing processing;

[0055] F. Processing of seamless thin-walled pipe fittings is completed: After the diameter reduction, the seamless thin-walled pipe fittings are cooled, cut, inspected with 180mm automatic magnetic leakage flaw detection equipment, tested with 80MPa hydraulic pressure testing machine, measured in length, weighed, sprayed, laser marked, bundled, and finally shipped out.

[0056] Those skilled in the art should understand that those skilled in the art can implement variations by combining the prior art and the above embodiments, which will not be described in detail here. Such variations do not affect the essential content of the present invention, and will not be described in detail here.

[0057] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A processing device for seamless thin-walled pipe fittings, Features: It includes a tube heating furnace, a spiral conical piercing machine, an Accu-Roll rolling mill, and an 8-stand three-roller micro-tension reducing mill; the tube holes of the tube heating furnace are arranged horizontally, and the tubes are heated when they pass through the tube holes from one side of the tube heating furnace to the other side; the cone head of the spiral conical piercing machine is arranged close to the Accu-Roll rolling mill, and after the tubes are heated out of the tube heating furnace, they are first processed by the Accu-Roll rolling mill and then immediately enter the spiral conical piercing machine, and the cone head of the spiral conical piercing machine performs piercing, and the tubes passing through the Accu-Roll rolling mill and the spiral conical piercing machine finally form seamless thin-walled pipe fittings with spiral outer walls; the 8-stand three-roller micro-tension reducing mill is provided with four groups of reducing rollers and a rotary pusher, the four groups of reducing rollers are arranged side by side and the axis interval is 280mm, each group of reducing rollers is provided with two driving rollers, and the two driving rollers of each group of reducing rollers are arranged up and down, from the entrance to the exit of the reducing rollers The axial distance between the two driving rollers of each group of reducing rollers gradually decreases in the direction of the inlet. The rotary pusher is used to fix the seamless thin-walled pipe fittings and drive the seamless thin-walled pipe fittings to rotate and push them into the inlet of the reducing rollers for reducing the diameter. The Accu-Roll rolling mill includes a tube rolling hole, and a pair of tube rolling rollers are arranged on the upper and lower sides of the tube rolling hole. The diameter of the tube blank and the maximum outer diameter of the tube rolling roller are interference fit. The tube rolling roller is a shuttle-shaped structure, and multiple tube rolling rollers are evenly arranged on the surface of the tube rolling roller. The spiral conical punching machine has a plurality of circular rings, each of which has an outer wall in the shape of an arc. The horizontal angle between the rotating shafts of the upper tube rolling roller and the lower tube rolling roller is 36°, and the bisector of the horizontal angle coincides with the central axis of the tube rolling hole. The outer surface of the cone head of the spiral conical punching machine is provided with a threaded protrusion, and the threaded protrusion corresponds to the thread specification rolled out by the tube rolling roller. The cone head of the spiral conical punching machine extends to half the depth of the tube rolling hole, and the driving shaft of the cone head of the spiral conical punching machine coincides with the central axis of the tube rolling hole.

2. A processing device for a seamless thin-walled pipe according to claim 1, It is characterized in that A high-frequency heating coil is arranged around the tube hole of the tube blank heating furnace, and the tube blank can quickly pass through the tube hole and be heated to the target temperature.

3. A processing device for a seamless thin-walled pipe according to claim 1, It is characterized in that The rotary propeller includes a fixed shaft, the outer wall of which is provided with a threaded protrusion corresponding to the thread specification rolled out by the tube rolling roller. The fixed shaft can fix the seamless thin-walled pipe fitting after completely passing through the hole of the seamless thin-walled pipe fitting.

4. A processing device for a seamless thin-walled pipe according to claim 3, It is characterized in that The axial distance between the two driving rollers of each set of reducing rollers is adjustable, the horizontal angle between the rotating shafts of the upper driving roller and the lower driving roller is 36°, the two driving rollers of each set of reducing rollers rotate in opposite directions at the same speed, and the outer wall of each driving roller is arc-shaped.

5. A method for processing seamless thin-walled pipe fittings, It is characterized in that The processing device for the seamless thin-walled pipe according to claim 4 comprises the following steps: A. Tube cutting: Put the tube into the cutting saw and cut it in batches according to the designed tube length; B. Heating of tube blanks: Put the cut tube blanks into the pushing mechanism, and push them through the tube holes of the tube blank heating furnace. After heating, they enter the next pushing mechanism and enter the next process. C. Piercing of tube blanks: The tube blanks are rotated and pushed into the tube rolling hole of the Accu-Roll rolling mill under the action of the pushing mechanism. The tube rolling rollers on the upper and lower sides of the tube rolling hole rotate in opposite directions at the same speed, pushing the tube blanks to the cone head of the spiral cone punching machine for perforation to form seamless thin-walled tube fittings. After the perforation is completed, the seamless thin-walled tube fittings are separated from the spiral cone punching machine and enter the pushing mechanism to enter the next process; D. Heating of seamless thin-walled pipe fittings: The pushing mechanism pushes the initially formed seamless thin-walled pipe fittings through the pipe hole of the pipe blank heating furnace, and after heating, enters the next pushing mechanism to enter the next process; E. Reducing the diameter of seamless thin-walled pipe fittings: adjust the axis spacing of each set of reducing rollers according to the designed pipe diameter, and spirally insert the seamless thin-walled pipe fittings into the fixed shaft of the rotary pusher. The rotary pusher drives the fixed shaft to rotate and push it into the entrance of the reducing roller for reducing processing; F. Processing of seamless thin-walled pipe fittings is completed: After the diameter reduction, the seamless thin-walled pipe fittings are cooled, cut, inspected with 180mm automatic magnetic leakage flaw detection equipment, tested with 80MPa hydraulic pressure testing machine, measured in length, weighed, sprayed, laser marked, bundled, and finally shipped out.

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