Industrial short-process pipe forming production process and equipment

Abstract

The invention belongs to the technical field of pipe thermal forming, and particularly relates to an industrial short-process pipe thermal forming production technology and equipment which comprises a main rolling mill, the right end of the main rolling mill is connected with a first foreground section, the right end of the first foreground section is connected with a second foreground section, and the left end of the main rolling mill is connected with a first background section. The left end of the first background section is fixedly connected with a second background section; according to the invention, three working procedures of steel pipe processing, perforating, pipe rolling and sizing are combined on one device, and the combined processing can furthest utilize the waste heat of raw materials for three-time forming, so that the production cycle can be shortened, the labor cost and the equipment investment cost can be reduced, the production efficiency can be improved, and the production cost can be reduced. And meanwhile, steel pipes of different specifications and different materials can be produced in a combined machining mode, the requirements of multiple industries are met, particularly for a large-diameter steel pipe production unit (multiple varieties and small batches), the equipment investment cost is saved by 2 / 3, the labor cost is saved by 1 / 2, and the plant occupied area is saved by 2 / 3.

Description

Technical Field

[0001] The invention relates to the technical field of pipe hot forming, and in particular to an industrial short-process pipe forming production process and equipment. Background Art

[0002] The development of steel pipe production technology began in the early 19th century, closely related to the rise of bicycle manufacturing, the development of oil, and the manufacture of ships, boilers, and aircraft during the two world wars. These demands promoted the rapid development of the steel pipe industry in terms of variety, output, and quality.

[0003] The three-roller combined piercing and rolling steel pipe process and equipment organized by Professor Li Guozhen was conceived by Comrade Dong Changmei of the Steel Rolling Machinery and Technology Equipment Research Laboratory of Taiyuan Heavy Machinery College. They applied to the First Ministry of Machinery Industry to develop a three-roller piercing and rolling steel pipe mill, which was included in the key scientific research projects. By 1977, all technical design and construction design were completed. Later, due to insufficient funds, it was delayed until 1987, when the ¢50mm semi-industrial experimental three-roller combined piercing and rolling mill was built and put into trial. According to the data, thousands of tons of ¢(50-60)mm*(4-7)mm hot-rolled finished pipes that met the national standards were produced at that time and sold as mechanical pipes and bearing pipes. It passed the national ministerial technical appraisal in 1991 and applied for a national patent in 1994. It won the third prize of ministerial science and technology progress and the first prize of provincial science and technology progress.

[0004] However, in the mass production process, the guide plate and the specific roller (containing the space hole type) are combined into a closed hole type to control the outer size of the steel pipe. The mandrel head and the mandrel are combined into a steel pipe internal deformation tool to control the inner diameter of the steel pipe. The four tools are combined together to correspond to the only steel pipe specification, and the standard outer diameter and inner diameter (wall thickness). As the production time increases, the four tools are subjected to different forces and wear differently. The products produced by them deviate more and more from the original design until the products are unqualified (exceeding the steel pipe manufacturing standard). All tools need to be replaced, and the production cost is huge, which cannot meet the mass production cost requirements. The service life of conventional tools is 1000-2000 guide plates, 100-300 mandrel heads, 1000-3000 limit mandrels, and 21000-100000 rollers.

[0005] Since the core rod, core rod head and guide plate cannot be restricted in this process, the service life of the tool will be sharply reduced, resulting in frequent replacement of production tools, wasted production time, excessively high production costs, lack of market competitiveness, and inability to adapt to market competition.

[0006] Chengdu Chengwu Steel Pipe Technology Co., Ltd. has an invention patent, patent number ZL202110714742.0. Its process features are that the rolling deformation is completed by two rolls, a mandrel head, a guide plate, and a mandrel. The backstage adopts a push rod and a core roller device. When punching, the roll forward angle and the roll rolling angle are designed in place first, and the tube blank is pushed into the front stage by the front stage, and the punching function is completed by the combination of the roll, the guide plate, and the mandrel head. The rough pipe returns to the front stage of the rolling mill and inserts the mandrel. At the same time, the roll forward angle and the rolling angle are adjusted in place according to the process design requirements. The rough pipe with the mandrel is brought into the adjusted hole type to complete the rolling function. The rolled steel pipe flows to the next process, that is, the sizing unit, to complete the outer diameter determination function, thereby obtaining a qualified steel pipe.

[0007] However, due to the two-roll deformation process used, the outer diameter deformation is within the range of ±20%, and a sizing machine is still needed to complete the subsequent outer diameter processing, and it has not been put into industrial production.

[0008] The existing combined processing technology can only combine the three processes of two-roll perforation, two-roll tube rolling and sizing in pairs, and it is not possible to complete these three processes on the tube blank on one device. Summary of the invention

[0009] In view of the deficiencies in the prior art, the present invention provides an industrial short-process pipe forming production process and equipment, which solves the problems existing in the background technology.

[0010] To achieve the above object, the present invention provides the following technical solutions: an industrial short-process pipe forming production process, S1. Three-roller piercing process: PLC program controls the forward angle, rolling angle, guide plate position according to the process setting, automatically adjusts the position of the roller, mandrel head, and guide plate, inputs the process parameters, adjusts the main machine parameters in place, and the backstage 1 simultaneously adjusts the centering roller precisely in place according to the process requirements; S2. The heated solid tube is transported to the front stage and transferred to the V-groove. The V-shaped driving roller in the V-groove of the front stage rotates forward to feed the tube into the roller. The front stage 2 is started. At this time, the connecting rod with the mandrel is used as a pusher to push synchronously to ensure that the tube is bitten by the roller. S3. After the tube is bitten, it is driven by the rollers and moves forward to the back stage while rotating. When the rough tube reaches 200mm in front of the first centering roller, the heat detection element first detects the signal, the centering roller releases the push rod, holds the rough tube, and the rough tube continues to move forward. When the rough tube reaches 200mm in front of the second centering roller, the heat detection element first detects the signal, the centering roller releases the push rod, holds the rough tube, and the rough tube continues to move forward. In this way, the above actions are gradually completed until the rough tube perforation is completed; S4. After the perforation of the rough tube is completed, the main machine stops, the rollers and guide plates are quickly separated according to the process requirements, the push rod is quickly retracted, and at the same time, the rear and front rollers are reversed to return the rough tube to the front V-groove of the rolling mill and to the designated position.

[0011] S5. When the ejector rod returns to the designated position, the second stage in the backstage replaces the ejector rod and removes it. At the same time, the connecting rod prepared in advance is loaded into the ejector rod trolley. The ejector rod trolley carries the new connecting rod and returns to the rolling position according to the set procedure. At this time, the centering roller holds the connecting rod and prepares for the next step of the tube rolling process. S6. Three-roller tube rolling process: After the perforation is completed, the rough tube has returned to the front stage. The rollers and guide plates are controlled by the computer to accurately adjust the rolling angle and the forward angle of the rollers according to the tube rolling process requirements. At the same time, the guide plates are adjusted in place and locked. At the same time, the second connecting rod with the mandrel at the front stage is inserted into the rough tube; S7. Start the front-stage roller mechanism to send the rough pipe into the rolling mill. After the rough pipe is bitten by the rolling mill, it rotates and moves forward, and is thinned and reduced in outer diameter according to the process requirements. When the rough pipe reaches 200mm in front of the first centering roller, the heat detection element detects the arrival signal of the hot steel pipe, and the computer controls the opening of the first centering roller. At this time, the rough pipe continues to move forward, and the centering roller holds the rough pipe, leaving a gap of 5mm. At this time, the rough pipe continues to move forward. When it reaches 200mm in front of the second rack, the detection element detects the arrival signal of the hot steel pipe, and the computer controls the opening of the second centering roller. At this time, the rough pipe continues to move forward, and so on until the rough pipe is rolled. The front-stage two-stage mandrel controls the wall thickness of the rough pipe, and the back-stage one-stage push rod plays a supporting role; S8. After the rough pipe is rolled, the main machine stops, the rollers and guide plates are separated to the set position according to the process requirements, and the front two-stage connecting rod transmission mechanism returns the mandrel to the original position and waits for the next instruction. After the rollers and guide plates are separated and in place, the back stage and front stage rollers are reversed to return the rough pipe to the front V-groove of the rolling mill and reach the specified position. The back two-stage connecting rod does not need to be returned. When receiving the rough pipe return signal, the centering roller holds the connecting rod to complete the pipe rolling process; S9. Three-roller sizing process: When the tube is rolled, the main machine receives the rolling completion signal, and the computer controls the rollers and guide plates to adjust the rollers and guide plates according to the process requirements. The roller rolling angle is also changed according to the process requirements. The rollers and guide plates are locked and the next instruction is awaited. S10. Send the rough pipe into the rolling mill. After the rough pipe is bitten in, it moves forward while rotating. The rough pipe passes through the hole formed by the combination of three rollers and three guide plates to reach the outer diameter required by the process. At this time, the finished steel pipe moves forward while rotating along a connecting rod at the back end (as an internal support of the steel pipe). When the finished steel pipe reaches 200mm in front of the first centering roller, the heat detection element detects the signal first, the first centering frame opens, the centering roller releases the connecting rod, holds the finished pipe, and the finished pipe continues to move forward. When the finished pipe reaches 200mm in front of the second centering roller, the heat detection element detects the signal first, the second centering frame opens under computer control, the centering roller releases the connecting rod, holds the finished pipe, and the finished pipe continues to move forward. In this way, the above actions are gradually completed until the rolling of the finished pipe is completed; S11. When the rolling of the finished steel pipe is completed, the main machine stops, the rollers and guide plates are separated to the set positions according to the process requirements, the back-end two-stage connecting rod returns to the original position, the connecting rod is moved out, and the punching push rod is moved in at the same time; the back-end one-stage and front-end one-stage rollers are reversed to return the finished pipe to the front-end V-groove of the rolling mill, and reach the specified position, and the front-end one-stage transverse trolley is started to transfer the finished steel pipe to the front-end receiving trolley; after the rolling mill receives the finished steel pipe and returns it to the position, the rolling rollers and guide plates of the rolling mill are adjusted to the position according to the process parameter requirements under the control of the computer program; the front-end one-stage receives the signal after the rolling of the finished steel pipe is completed, and the front-end one-stage is adjusted to the position according to the punching process requirements to ensure that the rolling center line coincides after the tube blank is placed, and the front stage is locked; the front-end two-stage connecting rod mechanism returns the connecting rod to the specified position, the limit oil cylinder returns to the position, the core rod cooling water is turned on, the core rod is cooled, and the next instruction is waited.

[0012] As a preferred technical solution of the present invention, the right end of the main rolling mill is connected to the front section, the right end of the front section is connected to the front section, the left end of the main rolling mill is connected to the back section, and the left end of the back section is fixedly connected to the back section; the main rolling mill includes a three-roll rolling mill; the front section includes the front section bed, the interior of the front section bed is fixedly installed with V-shaped transmission rollers and front section rollers; the front section includes the front section machine tool, the left end face of the front section machine tool is fixedly connected to the front section processing table, and the upper end face of the front section machine tool is provided with a core rod limit block, a core rod trolley and a core rod workbench; the back section includes the back section clamping structure and a centering frame; the back section includes the back section bed, the upper part of the back section bed is provided with a back section core rod top, and the right end of the back section bed is connected to the back section head.

[0013] As a preferred technical solution of the present invention, the left end face of the rolling mill roll of the three-roll rolling mill is fixedly connected to a transmission shaft, the left end face of the transmission shaft is fixedly connected to a reducer output shaft, the reducer output shaft is fixedly installed in the main rolling mill reducer, and the other end face of the main rolling mill reducer is fixedly connected to a power box.

[0014] As a preferred technical solution of the present invention, the lower end surface of the front stage bed is fixedly connected to the front stage fixed base plate, the upper end surface of the front stage fixed base plate is fixedly installed with a telescopic cylinder, the top of the telescopic cylinder is fixedly connected to a connecting head, and the axis of the connecting head is fixedly connected to a control rod.

[0015] As a preferred technical solution of the present invention, a front-end two-stage guide rail is fixedly installed on the upper end surface of the front-end two-stage machine tool, a core rod limiting slider is connected to the upper part of the front-end two-stage guide rail, a core rod limiting block is fixedly installed on the upper end surface of the core rod limiting slider, a core rod is arranged inside the core rod limiting block, a core rod is fixedly connected to the right end of the core rod with a core rod trolley, a front-end two-stage motor is arranged on the front end surface of the front-end two-stage machine tool, an output shaft of the front-end two-stage motor is fixedly connected to a front-end two-stage reducer, and an output shaft of the front-end two-stage reducer is connected to the core rod trolley.

[0016] As a preferred technical solution of the present invention, the centering frame includes a synchronous shaft and a rear-stage motor, a unloading rod is arranged circumferentially of the synchronous shaft, a rear-stage transmission shaft is fixedly connected to the rotating shaft of the rear-stage motor, a roller connecting shaft is fixedly connected to the end of the rear-stage transmission shaft, and a rear-stage roller is fixedly connected to the end of the roller connecting shaft away from the rear-stage motor.

[0017] As a preferred technical solution of the present invention, the interior of the rear-stage second-stage bed is fixedly installed with a rear-stage second-stage connecting beam and a lifting support platform, the upper end surface of the rear-stage second-stage bed is fixedly installed with a rear-stage second-stage guide rail, and the upper end surface of the rear-stage second-stage guide rail is provided with a rear-stage second-stage core rod head.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention combines three processes for steel pipe processing, punching, pipe rolling and sizing, into one device. The combined processing method can maximize the use of the waste heat of the raw materials to form them in three times, reduce energy waste, and thus reduce production costs, shorten the production cycle, reduce labor costs and equipment depreciation costs, and at the same time, the combined processing method can produce steel pipes of different specifications and materials to meet the needs of multiple industries. According to actual processing tests, the unit of the present invention is relative to the traditional process, which uses three sets of equipment for the production process of steel pipes, especially for large-diameter steel pipe production units (multiple varieties, small batches), saving 2 / 3 of equipment investment costs, 1 / 2 of labor costs, and 2 / 3 of plant floor space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the main rolling mill of the present invention; Figure 3 This is a schematic diagram of a backstage structure section of the present invention; Figure 4 This is a schematic diagram of the backstage two-stage structure of the present invention; Figure 5 This is a schematic diagram of the front stage structure of the present invention; Figure 6 It is a schematic diagram of the front two-stage structure of the present invention.

[0020] In the figure: 1. Main rolling mill; 2. Front stage 1; 3. Front stage 2; 4. Back stage 1; 5. Back stage 2; 6. Power box; 7. Reducer output shaft; 8. Main rolling mill reducer; 9. Three-roller rolling mill; 10. Support base; 11. Support rod; 12. Rolling table; 13. Transmission shaft; 14. Back stage 1 clamping structure; 15. Guard plate; 16. Centering frame; 17. Unloading rod; 18. Back stage 1 roller shaft; 19. Synchronous shaft; 20. Telescopic cylinder; 21. Lifting rod; 22. Back stage 1 motor; 23. Roller shaft connecting shaft; 24. Back stage 1 transmission shaft; 25. Back stage 2 roller shaft; 26. Back stage 2 connecting beam; 27. Back stage 2 guide rail; 28. First transmission shaft; 29. ​​Differential gear; 30. Back stage Two-stage motor; 31. Second transmission shaft; 32. Connecting and fixing rod; 33. Fixing frame; 34. Two-stage mandrel head at the back stage; 35. Lifting support platform; 36. Two-stage bed at the back stage; 37. Two-stage machine head at the back stage; 38. One-stage bed at the front stage; 39. V-shaped transmission roller; 40. One-stage roller at the front stage; 41. Control rod; 42. Connecting head; 43. One-stage fixed bottom plate at the front stage; 44. Telescopic cylinder; 45. Workpiece; 46. Two-stage processing table at the front stage; 47. Mandrel head; 48. Two-stage guide rail at the front stage; 49. Two-stage machine tool at the front stage; 50. Mandrel limit block; 51. Mandrel; 52. Mandrel trolley; 53. Two-stage reducer at the front stage; 54. Two-stage motor at the front stage; 55. Mandrel limit slider; 56. Mandrel workbench. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0022] See also Figure 1-6 The present invention provides the following technical solutions: an industrial short-process pipe forming production process, S1. Three-roller piercing process: The PLC control program automatically adjusts the position and direction of the rollers and guide plates according to the actual processing requirements of the process setting forward angle, rolling angle, and guide plate position, installs the mandrel head, inputs the process parameters, adjusts the main machine parameters in place, and the backstage 1 simultaneously adjusts the centering rollers precisely in place according to the process requirements; S2. The tube (solid tube) is transported to the front section of the rolling mill. The V-shaped transmission roller in the V-shaped groove of the front section rotates forward to feed the tube into the roller. The front section 2 is started. At this time, the connecting rod with the mandrel is used as a pusher to push synchronously to ensure that the tube is bitten by the roller. S3. After the tube is bitten, it is driven by the rollers and moves forward to the back stage while rotating. When the rough tube reaches 200mm in front of the first centering roller, the heat detection element first detects the signal, the centering roller releases the push rod, holds the rough tube, and the rough tube continues to move forward. When the rough tube reaches 200mm in front of the second centering roller, the heat detection element first detects the signal, the centering roller releases the push rod, holds the rough tube, and the rough tube continues to move forward. In this way, the above actions are gradually completed until the rough tube perforation is completed; S4. After the perforation of the rough tube is completed, the main machine stops, the rollers and guide plates are quickly separated according to the process requirements, the top rod is quickly retracted, and the rollers are reversed at the same time, and the rough tube is retracted to the front V-groove of the rolling mill and to the designated position.

[0023] S5. When the ejector rod returns to the designated position, the second stage in the backstage replaces the ejector rod and removes it. At the same time, the prepared connecting rod is loaded into the ejector rod trolley. The ejector rod trolley carries the new connecting rod and returns to the rolling position according to the set procedure. At this time, the centering roller holds the connecting rod and the piercing process is completed. S6. Three-roller tube rolling process: After the perforation is completed, the rough tube has returned to the front stage. The rollers and guide plates are controlled by the computer to accurately adjust the rolling angle and the forward angle of the rollers according to the tube rolling process requirements. At the same time, the guide plates are adjusted to the correct position. After the rollers and guide plates are automatically adjusted to the correct position, the rollers and guide plates are locked. At the same time, the second connecting rod with the mandrel at the front stage is inserted into the rough tube. S7. Start the front-stage roller mechanism to send the rough pipe into the rolling mill. After the rough pipe is bitten by the rolling mill, it rotates and moves forward, and is thinned and reduced in outer diameter according to the process requirements. When the rough pipe reaches 200mm in front of the first centering roller, the heat detection element detects the arrival signal of the hot steel pipe, and the computer controls the opening of the first centering roller. At this time, the rough pipe continues to move forward, and the centering roller holds the rough pipe, leaving a gap of 5mm. At this time, the rough pipe continues to move forward. When it reaches 200mm in front of the second rack, the detection element detects the arrival signal of the hot steel pipe, and the computer controls the opening of the second centering roller. At this time, the rough pipe continues to move forward, and so on until the rough pipe is rolled. The front-stage two-stage mandrel controls the wall thickness of the rough pipe, and the back-stage one-stage push rod plays a supporting role; S8. After the rough pipe is rolled, the main machine stops, the rollers and guide plates are separated to the set position according to the process requirements, and the front two-stage connecting rod transmission mechanism returns the mandrel to the original position and waits for the next instruction. After the rollers and guide plates are separated and in place, the rollers reverse and return the rough pipe to the front V-shaped groove of the rolling mill and to the specified position. The back two-stage connecting rod does not need to be returned. When receiving the rough pipe return signal, the centering roller holds the connecting rod to complete the pipe rolling process; S9. Three-roller sizing process: When the tube is rolled, the main machine receives the rolling completion signal, and the computer controls the rollers and guide plates to adjust the rollers and guide plates according to the process requirements. The roller rolling angle is also changed according to the process requirements. The rollers and guide plates are locked and the next instruction is awaited. S10. Send the rough pipe into the rolling mill. After the rough pipe is bitten in, it moves forward while rotating. The rough pipe passes through the hole formed by the combination of three rollers and three guide plates to reach the outer diameter required by the process. At this time, the finished steel pipe moves forward while rotating. When the finished steel pipe reaches 200mm in front of the first centering roller, the heat detection element detects the signal first, the first centering frame opens, the centering roller releases the top rod, holds the finished pipe, and the finished pipe continues to move forward. When the finished pipe reaches 200mm in front of the second centering roller, the heat detection element detects the signal first, the second centering frame opens under computer control, the centering roller releases the top rod, holds the finished pipe, and the finished pipe continues to move forward. In this way, the above actions are completed step by step until the rolling of the finished pipe is completed; S11. When the rolling of the finished steel pipe is completed, the main machine stops, the rollers and guide plates are separated to the set positions according to the process requirements, the back-end two-stage connecting rod returns to the original position, the connecting rod is moved out, and the perforated ejector rod is moved in at the same time; the roller reverses, returns the finished pipe to the front-end V-groove of the rolling mill, and to the specified position, and starts the front-end first-stage transverse trolley to transfer the finished steel pipe to the front-end receiving trolley; after the rolling mill receives the finished steel pipe and returns it to the position, under the control of the computer program, the rollers and guide plates of the rolling mill adjust the forward angle, rolling angle, roller distance, and guide plate distance according to the process parameter requirements; the front-end first stage receives the signal after the rolling of the finished steel pipe is completed, and the front-end first stage adjustment mechanism is adjusted to the position to ensure that the rolling center line coincides after the tube blank is placed, and the front stage is locked; the front-end two-stage connecting rod mechanism returns the connecting rod to the specified position, the limit cylinder returns to the position, the core rod cooling water is turned on, the core rod is cooled, and the next instruction is waited for.

[0024] In this embodiment, three rollers are used as the main drive, three guide plates are added at the three roller gaps, and limited mandrel rolling is adopted. By changing the roller forward angle and the roller rolling angle, three independent space hole types are respectively combined, and the mandrel head and mandrel are respectively matched to independently complete the three processes of perforation, tube rolling and sizing. A set of processes is repeated three times for the processing of the pipe, which is a cycle. The steel pipe is rolled three times. At the same time, the rollers, guide plates, and guide plates are adjusted separately. The mandrel and connecting rod are replaced according to the process requirements. Each action is completed independently of each other, and complementary interference is achieved. After the individual tools are worn, they are adjusted separately in time to meet the precision requirements of the finished product. The axis of the roller is inclined relative to the rolling line. After the round tube enters the roller, it is driven to rotate in the opposite direction by the friction between the metal and the roller. At the same time, because the axis of the roller has an inclination angle relative to the axis of the billet (rolling axis), which is called the forward angle, the tube billet-rough tube moves axially while rotating. From then on, every point on the surface of the tube billet-rough tube in the deformation zone is in spiral motion, rotating and advancing at the same time.

[0025] Specifically, the inclination angle of the rolling axis and the roller axis in the vertical plane is the advancement angle, and the inclination angle of the rolling axis and the roller axis in the horizontal plane is the rolling angle. The rolling angle is 8 degrees during punching, 6 degrees during rolling, and 5 degrees during sizing. The advancement angle is 8 degrees during punching, and 6 degrees for both rolling and sizing.

[0026] The present invention provides the following technical solution: an industrial short-process pipe forming equipment, comprising a main rolling mill 1, the right end of the main rolling mill 1 is connected to a front section 2, the right end of the front section 2 is connected to a front section 2 3, the left end of the main rolling mill 1 is connected to a back section 4, and the left end of the back section 4 is fixedly connected to a back section 2 5; the main rolling mill 1 comprises a three-roller rolling mill 9; the front section 2 comprises a front section bed 38, the interior of the front section bed 38 is fixedly installed with a V-shaped transmission roller 39 and a front section roller 40; the front section The second section 3 includes a front-stage second machine tool 49, the left end face of which is fixedly connected to the front-stage second processing table 46, and the upper end face of the front-stage second machine tool 49 is provided with a core rod limit block 50, a core rod trolley 52 and a core rod workbench 56; the back-stage first section 4 includes a back-stage first clamping structure 14 and a centering frame 16; the back-stage second section 5 includes a back-stage second bed 36, the upper part of the back-stage second bed 36 is provided with a back-stage second core rod top 34, and the right end of the back-stage second bed 36 is connected to the back-stage second machine head 37.

[0027] In this embodiment, a certain gap is set between the main rolling mill 1, the front stage 2 and the front stage 2 3, and the main rolling mill 1, the back stage 4 and the back stage 2 5 are fixedly connected by connecting parts. Three groups of rollers and three guide plates are arranged inside the three-roller rolling mill 9. Through the circumferential movement of the three groups of rollers, pipes of different diameters can be processed. At the same time, the three groups of rollers can also rotate at a spatial angle. Three groups of V-shaped transmission rollers are arranged, and two transmission rollers are arranged in each group. Three groups of front stage rollers 40 are arranged, which can be raised and lowered to adapt to pipes of different diameters. The functions of the mandrel limit block 50, the mandrel trolley 52 and the mandrel workbench 56 are to ensure that the mandrel 51 remains stable during the processing. The clamping structure 14 and the centering frame 16 are composed of four groups of centering frames. The back stage 2 mainly plays the role of pushing back the processed pipe.

[0028] Specifically, the left end face of the rolling mill roll of the three-roll rolling mill 9 is fixedly connected to the transmission shaft 13, the left end face of the transmission shaft 13 is fixedly connected to the reducer output shaft 7, the reducer output shaft 7 is fixedly installed in the main rolling mill reducer 8, and the other end face of the main rolling mill reducer 8 is fixedly connected to the power box 6.

[0029] In this embodiment, three groups of transmission structures are provided, a motor is provided in the power box 6, and the main rolling mill reducer 8 adopts a three-stage reduction structure. Through the transmission shaft 13, power can still be transmitted when the roller changes its angle.

[0030] Specifically, the lower end surface of the front section bed 38 is fixedly connected to the front section fixed base plate 43, the upper end surface of the front section fixed base plate 43 is fixedly installed with a telescopic cylinder 44, the top of the telescopic cylinder 44 is fixedly connected to a connecting head 42, and the axis of the connecting head 42 is fixedly connected to a control rod 41.

[0031] In this embodiment, the fixed base plate 43 and the telescopic cylinder 44 are connected by a fixed seat, and the connection method is hinged. The telescopic cylinder 44, the connecting head 42 and the control rod 41 are provided with three groups. The telescopic cylinder 44 is operated to realize the up and down movement of the front section roller 40.

[0032] Specifically, the upper end surface of the front second-stage machine tool 49 is fixedly installed with a front second-stage guide rail 48, the upper part of the front second-stage guide rail 48 is connected with a core rod limiting slider 55, the upper end surface of the core rod limiting slider 55 is fixedly installed with a core rod limiting block 50, a core rod 51 is arranged inside the core rod limiting block 50, the right end of the core rod 51 is fixedly connected with a core rod trolley 52, the front end surface of the front second-stage machine tool 49 is provided with a front second-stage motor 54, the output shaft of the front second-stage motor 54 is fixedly connected with a front second-stage reducer 53, and the output shaft of the front second-stage reducer 53 is connected to the core rod trolley 52.

[0033] In this embodiment, the front two-stage guide rail 48 is connected by threaded bolts, and the power provided by the front two-stage motor 54 is used to realize the reciprocating motion of the mandrel trolley 52 along the front two-stage guide rail 48, thereby driving the mandrel 51 to move and process the tube blank, rough tube and rough tube.

[0034] Specifically, the centering frame 16 includes a synchronous shaft 19 and a rear-stage motor. A unloading rod 17 is arranged circumferentially of the synchronous shaft 19. A rear-stage transmission shaft 24 is fixedly connected to the rotating shaft of the rear-stage motor 22. A roller connecting shaft 23 is fixedly connected to the end of the rear-stage transmission shaft 24. The roller connecting shaft 23 is fixedly connected to a rear-stage roller 18 at one end away from the rear-stage motor 22.

[0035] In this embodiment, four centering frames 16 are combined with auxiliary parts to form a backstage section 4. When processing the tube blanks, rough tubes and rough tubes, they are processed from right to left in sequence through the four centering frames 16. After the processing is completed, the unloading rod 17 is raised to move the processed tubes out of the entire equipment.

[0036] Specifically, the interior of the backstage second-section bed 36 is fixedly installed with the backstage second-section connecting beam 26 and the lifting support platform 35, the upper end surface of the backstage second-section bed 36 is fixedly installed with the backstage second-section guide rail 27, and the upper end surface of the backstage second-section guide rail 27 is provided with the backstage second-section core rod head 34.

[0037] In this embodiment, three groups of backstage second-stage connecting beams 26 are provided, which mainly play the role of strengthening the overall strength of the equipment. Three groups of lifting support platforms 35 are also provided. During the processing, they are raised when the pipe enters the backstage second stage to support the pipe to be processed. The backstage second-stage mandrel plug 34 and the subsequent power providing structure play the role of grabbing and pushing back the processed pipe.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An industrial short-process pipe forming production process, characterized in that: S1. Three-roller piercing process: PLC program controls the forward angle, rolling angle, guide plate position according to the process setting, automatically adjusts the position of the roller, mandrel head, and guide plate, inputs the process parameters, adjusts the main machine parameters in place, and the backstage 1 simultaneously adjusts the centering roller precisely in place according to the process requirements; S2. The heated solid tube is transported to the front stage and transferred to the V-groove. The V-shaped driving roller in the V-groove of the front stage rotates forward to feed the tube into the roller. The front stage 2 is started. At this time, the connecting rod with the mandrel is used as a pusher to push synchronously to ensure that the tube is bitten by the roller. S3. After the tube is bitten, it is driven by the rollers and moves forward to the back stage while rotating. When the rough tube reaches 200mm in front of the first centering roller, the heat detection element first detects the signal, the centering roller releases the push rod, holds the rough tube, and the rough tube continues to move forward. When the rough tube reaches 200mm in front of the second centering roller, the heat detection element first detects the signal, the centering roller releases the push rod, holds the rough tube, and the rough tube continues to move forward. In this way, the above actions are gradually completed until the rough tube perforation is completed; S4. After the rough tube is pierced, the main machine stops, the rollers and guide plates are quickly separated according to the process requirements, the top rod is quickly retracted, and at the same time, the rear and front rollers are reversed to return the rough tube to the front V-groove of the rolling mill and to the designated position; S5. When the ejector rod returns to the designated position, the second stage in the backstage replaces the ejector rod and removes it. At the same time, the connecting rod prepared in advance is loaded into the ejector rod trolley. The ejector rod trolley carries the new connecting rod and returns to the rolling position according to the set procedure. At this time, the centering roller holds the connecting rod and prepares for the next step of the tube rolling process. S6. Three-roller tube rolling process: After the perforation is completed, the rough tube has returned to the front stage. The rollers and guide plates are controlled by the computer to accurately adjust the rolling angle and the forward angle of the rollers according to the tube rolling process requirements. At the same time, the guide plates are adjusted in place and locked. At the same time, the second connecting rod with the mandrel at the front stage is inserted into the rough tube; S7. Start the front-stage roller mechanism to send the rough pipe into the rolling mill. After the rough pipe is bitten by the rolling mill, it rotates and moves forward, and is thinned and reduced in outer diameter according to the process requirements. When the rough pipe reaches 200mm in front of the first centering roller, the heat detection element detects the arrival signal of the hot steel pipe, and the computer controls the opening of the first centering roller. At this time, the rough pipe continues to move forward, and the centering roller holds the rough pipe, leaving a gap of 5mm. At this time, the rough pipe continues to move forward. When it reaches 200mm in front of the second rack, the detection element detects the arrival signal of the hot steel pipe, and the computer controls the opening of the second centering roller. At this time, the rough pipe continues to move forward, and so on until the rough pipe is rolled. The front-stage two-stage mandrel controls the wall thickness of the rough pipe, and the back-stage one-stage push rod plays a supporting role; S8. After the rough pipe is rolled, the main machine stops, the rollers and guide plates are separated to the set position according to the process requirements, and the front two-stage connecting rod transmission mechanism returns the mandrel to the original position and waits for the next instruction. After the rollers and guide plates are separated and in place, the back stage and front stage rollers are reversed to return the rough pipe to the front V-groove of the rolling mill and reach the specified position. The back two-stage connecting rod does not need to be returned. When receiving the rough pipe return signal, the centering roller holds the connecting rod to complete the pipe rolling process; S9. Three-roller sizing process: When the tube is rolled, the main machine receives the rolling completion signal, and the computer controls the rollers and guide plates to adjust the rollers and guide plates according to the process requirements. The roller rolling angle is also changed according to the process requirements. The rollers and guide plates are locked and the next instruction is awaited. S10. Send the rough pipe into the rolling mill. After the rough pipe is bitten in, it moves forward while rotating. The rough pipe passes through the hole formed by the combination of three rollers and three guide plates to reach the outer diameter required by the process. At this time, the finished steel pipe moves forward while rotating along a connecting rod at the back end (as an internal support of the steel pipe). When the finished steel pipe reaches 200mm in front of the first centering roller, the heat detection element detects the signal first, the first centering frame opens, the centering roller releases the connecting rod, holds the finished pipe, and the finished pipe continues to move forward. When the finished pipe reaches 200mm in front of the second centering roller, the heat detection element detects the signal first, the second centering frame opens under computer control, the centering roller releases the connecting rod, holds the finished pipe, and the finished pipe continues to move forward. In this way, the above actions are gradually completed until the rolling of the finished pipe is completed; S11. When the rolling of the finished steel pipe is completed, the main machine stops, the rollers and guide plates are separated to the set positions according to the process requirements, the back-end two-stage connecting rod returns to the original position, the connecting rod is moved out, and the punching push rod is moved in at the same time; the back-end one-stage and front-end one-stage rollers are reversed to return the finished pipe to the front-end V-groove of the rolling mill, and reach the specified position, and the front-end one-stage transverse trolley is started to transfer the finished steel pipe to the front-end receiving trolley; after the rolling mill receives the finished steel pipe and returns it to the position, the rolling rollers and guide plates of the rolling mill are adjusted to the position according to the process parameter requirements under the control of the computer program; the front-end one-stage receives the signal after the rolling of the finished steel pipe is completed, and the front-end one-stage is adjusted to the position according to the punching process requirements to ensure that the rolling center line coincides after the tube blank is placed, and the front stage is locked; the front-end two-stage connecting rod mechanism returns the connecting rod to the specified position, the limit oil cylinder returns to the position, the core rod cooling water is turned on, the core rod is cooled, and the next instruction is waited.

2. An industrial short-process tube forming equipment, comprising a main rolling mill (1), characterized in that: The right end of the main rolling mill (1) is connected to the front section (2), the right end of the front section (2) is connected to the front section (3), the left end of the main rolling mill (1) is connected to the back section (4), the left end of the back section (4) is fixedly connected to the back section (5); the main rolling mill (1) includes a three-roller rolling mill (9); the front section (2) includes a front section bed (38), a V-shaped transmission roller (39) and a front section roller (40) are fixedly installed inside the front section bed (38); the front section (3) includes a front section machine tool (49) The left end face of the front second section machine tool (49) is fixedly connected to the front second section processing table (46), and the upper end face of the front second section machine tool (49) is provided with a core rod limit block (50), a core rod trolley (52) and a core rod workbench (56); the back stage (4) includes a back stage clamping structure (14) and a centering frame (16); the back stage (5) includes a back stage bed (36), the upper part of the back stage bed (36) is provided with a back stage core rod top (34), and the right end of the back stage bed (36) is connected to a back stage machine head (37).

3. The industrial short-process pipe forming equipment according to claim 2 is characterized in that: The left end surface of the roller of the three-roller rolling mill (9) is fixedly connected to a transmission shaft (13), the left end surface of the transmission shaft (13) is fixedly connected to a reducer output shaft (7), the reducer output shaft (7) is fixedly installed in a main rolling mill reducer (8), and the other end surface of the main rolling mill reducer (8) is fixedly connected to a power box (6).

4. The industrial short-process pipe forming equipment according to claim 2 is characterized in that: The lower end surface of the front stage bed (38) is fixedly connected to a front stage fixed base plate (43), the upper end surface of the front stage fixed base plate (43) is fixedly mounted with a telescopic oil cylinder (44), the top of the telescopic oil cylinder (44) is fixedly connected to a connecting head (42), and the axis of the connecting head (42) is fixedly connected to a control rod (41).

5. The industrial short-process pipe forming equipment according to claim 2 is characterized in that: The upper end surface of the front-end second-stage machine tool (49) is fixedly installed with a front-end second-stage guide rail (48), the upper part of the front-end second-stage guide rail (48) is connected to a core rod limiting slider (55), the upper end surface of the core rod limiting slider (55) is fixedly installed with a core rod limiting block (50), a core rod (51) is arranged inside the core rod limiting block (50), the right end of the core rod (51) is fixedly connected to a core rod trolley (52), the front end surface of the front-end second-stage machine tool (49) is provided with a front-end second-stage motor (54), the output shaft of the front-end second-stage motor (54) is fixedly connected to a front-end second-stage reducer (53), and the output shaft of the front-end second-stage reducer (53) is connected to the core rod trolley (52).

6. The industrial short-process pipe forming equipment according to claim 2 is characterized in that: The centering frame (16) comprises a synchronous shaft (19) and a rear motor, a discharge rod (17) is arranged in the circumference of the synchronous shaft (19), a rear drive shaft (24) is fixedly connected to the rotating shaft of the rear motor (22), a roller connecting shaft (23) is fixedly connected to the end of the rear drive shaft (24), and a rear roller (18) is fixedly connected to the end of the roller connecting shaft (23) away from the rear motor (22).

7. The industrial short-process pipe forming equipment according to claim 2 is characterized in that: A backstage second-stage connecting beam (26) and a lifting support platform (35) are fixedly installed inside the backstage second-stage bed (36), a backstage second-stage guide rail (27) is fixedly installed on the upper end surface of the backstage second-stage bed (36), and a backstage second-stage core rod plug (34) is arranged on the upper end surface of the backstage second-stage guide rail (27).

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