A spiral tube spinning device and a high-precision spiral tube manufacturing method

Abstract

A spiral pipe spinning device is characterized in that it comprises at least two pressure rollers and a supporting roller, the distance between the pressure rollers and the supporting roller is adjustable, the pressure rollers and the supporting roller are inclined at an angle, and a finished straight pipe is clamped, bent and rotated by the pressure rollers and the supporting roller to form a spiral. A high-precision spiral pipe manufacturing method comprises the following steps: (1) adjusting the distance between the pressure rollers L according to the requirements of the spiral diameter and the pitch of the spiral pipe, and adjusting the installation angle of the pressure rollers and the supporting roller to be alpha; (2) feeding the finished straight pipe forward by a required length of the straight pipe section, lowering the pressure rollers by a set amount h, starting the rotation of the supporting roller, and after the finished straight pipe is spun forward by a set length, the supporting roller is raised, the spiral section of the spiral pipe is formed, and a special spiral pipe is formed. The present application has the advantages of high production efficiency, flexible adjustment, guaranteed product performance, outer diameter wall thickness size, straightness, deformation section size precision and shape position precision, and surface quality.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of spiral pipe processing, in particular to a spiral pipe spinning device and a manufacturing method of high-precision large-pitch and small-spiral-diameter spiral pipe. BACKGROUND

[0002] With the development of nuclear power technology, miniaturization, multipurpose and modularization are the development trends of future nuclear power and nuclear equipment for special fields. Figure 2 , Figure 3 The performance and shape of the spiral pipe are special, and the straightness, dimensional accuracy and shape position accuracy of the spiral section and the surface quality are all highly required. The performance requirements of tensile strength and yield strength are relatively high. The spiral diameter of the product is small (the spiral diameter can be smaller than the pipe diameter), and the pitch is large (the pitch can be tens of times of the pipe diameter). The conventional winding and push-bending forming methods cannot be realized, and how to realize the processing of the special spiral pipe is a difficult problem to be solved. SUMMARY

[0003] The present application aims at the defects of the prior art, and provides a spiral pipe spinning device and a manufacturing method of high-precision special spiral pipe, which can guarantee the shape and position tolerance and size of the special spiral pipe, and the structural strength can meet the requirements.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] A spiral pipe spinning device, characterized in that: it comprises at least two pressure rollers and a supporting roller, the distance between the pressure rollers and the supporting roller is adjustable; the supporting roller and the pressure rollers are inclined at an angle; the finished straight pipe is clamped, bent and rotated by the supporting roller and the pressure rollers to form a spiral. The roller surfaces of the pressure rollers and the supporting roller are processed according to a certain curve, which is designed according to the roller installation angle α and the minimum outer diameter d of the pipe material, so as to ensure that the pipe maintains sufficient envelope angle and contact line with the roller during deformation, and to ensure that the pipe does not slip during deformation.

[0006] Further, the pressure rollers are two and are arranged on the bottom plate, and the distance between the two pressure rollers is adjusted by a pressure roller distance adjusting mechanism. The distance between the pressure rollers depends on the pitch of the spiral pipe, and the pitch of the spiral pipe can be adjusted by adjusting the distance between the two pressure rollers.

[0007] Further, the pressure rollers are mounted on a pressure roller seat, the pressure roller seat is mounted on the bottom plate, the pressure roller distance adjusting mechanism is arranged on the upper part of the pressure roller seat, and the pressure roller seat is respectively provided with a roller seat angle adjusting mechanism for adjusting the angle of the pressure rollers.

[0008] Preferably, the bottom plate is connected to a lifting mechanism, guide columns are arranged on both sides of the bottom plate, and the lifting mechanism is mounted on a frame.

[0009] Preferably, the lifting mechanism is a worm and gear lifting mechanism driven by a servo motor.

[0010] Preferably, the carrier roller rotates actively, and the compression roller rotates passively.

[0011] Further, the carrier roller is arranged on a roller angle adjusting mechanism and is driven to rotate by a chain transmission driven by a driving motor.

[0012] A high-precision spiral pipe manufacturing method using the spiral pipe spinning device, characterized by comprising the following steps:

[0013] (1) Adjust the distance L between the compression rollers according to the requirements of the spiral pipe spiral outer diameter and pitch, and adjust the installation angle of the compression rollers and the carrier roller to α;

[0014] (2) Feed the finished straight pipe forward by a required straight pipe length, lower the compression rollers by a set amount h, and start rotating the carrier roller. After the finished straight pipe is spun forward by a set length, the carrier roller is raised, the spiral pipe spiral section forming is completed, and a special spiral pipe is formed. The amount h is related to the spiral diameter D of the product, the outer diameter d of the steel pipe, and the performance of the pipe material. Considering the deformation and rebound amount of the pipe material, the obtained compression roller compression amount h is to maintain the axial deviation amount of the steel pipe during the deformation process, and finally make the spiral diameter of the spiral pipe meet the product requirements.

[0015] Further, the distance L between the two compression rollers is equal to 2P, P is the pitch of the spiral pipe; the compression roller and the carrier roller rotate perpendicularly to the roller direction line speed V, which is decomposed into horizontal direction speed V1 and vertical direction speed V2; at the same time t, V1xt=P, V2xt=πd, and α is arccos(V1 / V), wherein d is the outer diameter of the spiral pipe.

[0016] Preferably, the processing process of the finished straight pipe and the post-processing of the spiral pipe comprises the following steps:

[0017] S10, after the pipe blank is rolled to a semi-finished pipe through multiple passes of cold rolling, the deformation amount of each pass of rolling is 50% to 80%, the intermediate product after each cold rolling is degreased and cleaned, and the intermediate product is heat treated at a holding temperature of 1000°C to 1150°C, the holding time is ≥2 min; then the pipe is straightened using a straightening machine, the straightness of the pipe after straightening is ≤1.5 mm / m, and then the pipe is polished using a belt polisher;

[0018] S20, the semi-finished pipe is cold drawn to a finished straight pipe, and the drawing deformation amount is 18% to 30%;

[0019] S30, the inner and outer surfaces of the finished straight pipe are degreased and cleaned, and the inner and outer surfaces are wiped clean;

[0020] S40, the finished straight pipe is subjected to final product heat treatment, the heat treatment temperature is 1060-1120 DEG C, the holding time is greater than or equal to 2 min, and the cooling time of the pipe from 1060 DEG C to below 500 DEG C is not more than 5 min;

[0021] S50, the finished straight pipe is straightened using a straightening machine, the straightness of the pipe after straightening is less than or equal to 1 mm / m, and then the pipe is polished using a belt polisher;

[0022] S60, the finished straight pipe is subjected to TT heat treatment, and the pipe is heated in a vacuum state, the temperature is 700-750 DEG C, and the holding time is greater than or equal to 5 h;

[0023] S70, the finished straight pipe after heat treatment is subjected to spinning to form a spiral pipe;

[0024] S80, the spiral pipe is subjected to stress relief heat treatment in a vacuum state, the temperature is 700-750 DEG C, and the holding time is greater than or equal to 2 h.

[0025] The finished straight pipe is clamped, bent and rotated to form a spiral through the obliquely arranged pressure roller and the supporting roller. The present application has high production efficiency and flexible adjustment, and can ensure the product performance, the outer diameter wall thickness size, the straightness, the size precision and shape position precision of the deformation section and the surface quality. The problems that the small spiral diameter and large pitch spiral pipe cannot be formed by the conventional winding and push bending forming methods are solved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a flow chart of the manufacturing method of the high-precision special spiral pipe.

[0027] Figure 2 It is an elevation view of the spiral pipe.

[0028] Figure 3 It is an enlarged sectional view along the line A-A in the figure. Figure 2

[0029] Figure 4 It is a schematic view of the installation angle of the supporting roller and the pressure roller.

[0030] Figure 5 It is a speed decomposition view of the supporting roller and the pressure roller.

[0031] Figure 6 It is a schematic view of the structure of the spiral pipe spinning device.

[0032] Figure 7 It is a schematic view of the transmission part of the spiral pipe spinning device.

[0033] Figure 8 It is a schematic view of the angle adjusting mechanism of the supporting roller.

[0034] ​1, frame; 1.1, guide sleeve;

[0035] 2, roller device; 2.1, base plate; 2.2, guide column; 2.3, pressure roller; 2.4, worm and worm gear elevator; 2.5, servo motor; 2.6, pressure roller spacing adjustment mechanism; 2.7, pressure roller seat;

[0036] 3, driving roller device; 3.1, carrier roller; 3.2, transmission chain; 3.3, speed reducer; 3.4, shaft coupling; 3.5, driving motor; 3.6, roller seat angle adjustment mechanism; 3.7, sprocket; 4, finished straight pipe. DETAILED DESCRIPTION

[0037] The application will be further described in conjunction with the drawings.

[0038] As shown in Figure 2 , Figure 3 , the product is a special spiral pipe, the head and tail of which are straight pipe sections, and the middle part is a spiral section, and the pitch of the spiral section is large and the diameter of the spiral is small (much smaller than the outer diameter of the pipe material).

[0039] As shown in Figures 1 to 8 , a manufacturing method of a high-precision special spiral pipe, comprising the following steps:

[0040] S10, a nickel-based alloy pipe blank with an outer diameter of Φ80mm and a wall thickness of 8mm is cold rolled for four passes to an outer diameter of Φ12mm and a wall thickness of 1.5mm of semi-finished pipe, and the deformation amount of each pass is 48%~67%, and the intermediate product after each cold rolling is degreased, cleaned, and heat treated at a holding temperature of 1000℃~1150℃, and the holding time is ≥2min; then straightening is performed using a straightening machine, and the straightness of the pipe after straightening is ≤1.5mm / m, and then grinding is performed using a belt sander;

[0041] S20, the semi-finished pipe with an outer diameter of Φ12mm and a wall thickness of 1.5mm is cold drawn to an outer diameter of Φ10mm and a wall thickness of 1.5mm of finished straight pipe, and the drawing deformation amount is 19%;

[0042] S30, the inner and outer surfaces of the finished straight pipe are degreased, cleaned, and wiped clean;

[0043] S40, the finished straight pipe is subjected to final product heat treatment, the heat treatment temperature is 1060℃~1120℃, the holding time is ≥2min, and the cooling time of the pipe from 1060℃ to below 500℃ is not more than 5 minutes;

[0044] S50, the finished straight pipe is straightened using a straightening machine, and the straightness of the pipe after straightening is ≤1mm / m, and then grinding is performed using a belt sander;

[0045] S60, the finished straight pipe is subjected to TT heat treatment, heated in a vacuum state, temperature 700-750 DEG C, holding time ≥5h;

[0046] S70, the finished straight pipe after heat treatment is subjected to spiral segment forming using a spiral pipe spinning device, and the forming is realized in a spinning manner.

[0047] As shown in the spiral pipe spinning device shown in Figure 6 , 7 , the spiral pipe spinning device comprises a frame 1, a press roller device 2 and a driving roller device 3.

[0048] The frame 1 is provided with an inlet and an outlet on the left and right sides respectively, and two holes are provided on the top for installing guide sleeves 1.1.

[0049] The press roller device 2 comprises a bottom plate 2.1, guide columns 2.2, press rollers 2.3, worm and gear elevators 2.4, servo motors 2.5, press roller spacing adjustment mechanisms 2.6 and press roller seats 2.7. The press rollers 2.3 are installed on the press roller seats 2.7, and the press roller seats 2.7 are installed on the bottom plate 2.1. The press roller spacing adjustment mechanisms 2.6 are arranged on the upper portions of the press roller seats 2.7 to adjust the distance between the two press rollers. Meanwhile, the press roller seats 2.7 are provided with roller seat angle adjustment mechanisms to adjust the angle of the press rollers. The worm and gear elevators 2.4 are installed on the frame 1 and connected to the bottom plate 2.1 and driven by the servo motors 2.5. Meanwhile, the guide columns 2.2 are installed on the bottom plate 2.1 and upwardly directed and used in cooperation with the guide sleeves 1.1 to ensure the stability of the press rollers during lifting;

[0050] The driving roller device 3 comprises carrier rollers 3.1, transmission chains 3.2, speed reducers 3.3, couplings 3.4, driving motors 3.5, roller seat angle adjustment mechanisms 3.6 and sprockets 3.7. The carrier rollers 3.1 are installed on the frame 1 and upwardly directed, connected to the speed reducers 3.3 through the transmission chains 3.2 and driven by the driving motors 3.5 through the couplings 3.4. The carrier rollers 3.1 are provided with the roller seat angle adjustment mechanisms 3.6 to adjust the angle of the carrier rollers 3.1.

[0051] The spiral pipe requires a spiral diameter D of 2.2 mm and a pitch P of 100 mm. Before the pipe is subjected to spinning, the distance L between the two pressure rollers is adjusted to 200 mm, which is twice the pitch P, by using the pressure roller distance adjustment mechanism 2.6 according to the requirements of the spiral outer diameter and pitch of the product. According to the vertical direction rotation linear speed V of the pressure roller and the supporting roller, the horizontal direction speed is V1xt=P, and the vertical direction speed is V2xt=πd, and α is calculated as arccos(V1 / V), where d is the outer diameter of the spiral pipe. The pressure roller 2.3 and the supporting roller 3.1 are adjusted to the appropriate installation angle α by using the roller seat angle adjustment mechanism 3.6. Then the finished straight pipe 4 is sent forward by the required straight pipe length, the worm and gear elevator 2.4 lowers the pressure roller 2.3 by a set amount h, at which time the finished straight pipe 4 is pressed between the pressure roller 2.3 and the supporting roller 3.1; the supporting roller 3.1 starts to rotate driven by the driving motor 3.5, and the steel pipe 4 is spun forward by a set length, then the worm and gear elevator 2.4 rises, the spiral section of the pipe is formed, and a special spiral pipe is formed, which has straight pipe sections at the head and tail and a spiral section in the middle, and has a large pitch, a small spiral diameter (much smaller than the outer diameter of the pipe material);

[0052] S80, the spiral pipe is subjected to stress heat treatment, which is carried out in a vacuum state, at a temperature of 700-750℃, and the holding time is ≥2h. The high-precision special spiral pipe reaches the final state.

[0053] The technical principles of the present application are described above in combination with specific embodiments. These descriptions are only for the purpose of explaining the principles of the present application, and cannot be interpreted in any way as a limitation on the scope of protection of the present application. Based on the explanations herein, those skilled in the art can easily think of other specific embodiments of the present application without any creative effort, and these embodiments will all fall within the scope of protection of the claims of the present application.

Claims

1. A spiral tube spinning device, the spiral tube having a spiral diameter smaller than the tube diameter, and a pitch number tens of times larger than the tube diameter; characterized in that: It comprises two pressure rollers arranged on the same side and a supporting roller arranged on the other side between the two pressure rollers, the distance between the pressure rollers and the supporting roller is adjustable, the supporting roller and the pressure rollers are inclined at an angle, the angle is adjustable, the angles of the two pressure rollers are in the same direction, the angle of the pressure roller is opposite to the direction of the supporting roller, and the finished straight pipe is clamped, bent and rotated by the supporting roller and the pressure rollers to form a spiral.

2. The scroll tube spinning apparatus of claim 1, wherein: The two pressure rollers are arranged on the bottom plate respectively, and the distance between the two pressure rollers is adjusted by a pressure roller distance adjusting mechanism.

3. A flow forming apparatus as claimed in claim 2, wherein: The pressure rollers are mounted on a pressure roller seat, the pressure roller seat is mounted on the bottom plate, the pressure roller distance adjusting mechanism is arranged on the upper part of the pressure roller seat, and a roller seat angle adjusting mechanism is arranged on the pressure roller seat respectively to adjust the angle of the pressure roller.

4. The flow-form spinning apparatus of claim 3, wherein: The bottom plate is connected to a lifting mechanism, and guide columns are arranged on both sides of the bottom plate.

5. A spiral tube spinning apparatus as claimed in claim 4, wherein: The lifting mechanism is a worm and worm gear lifting mechanism driven by a servo motor.

6. A flow forming apparatus as claimed in any one of claims 1 to 5, wherein: The supporting roller rotates actively, and the pressure roller rotates passively.

7. A spiral tube spinning apparatus as claimed in claim 6, characterized in that: The supporting roller is arranged on a roller angle adjusting mechanism and is driven to rotate by a chain transmission driven by a driving motor.

8. A high-precision spiral pipe manufacturing method using the spiral pipe spinning device according to any one of claims 1 to 7, characterized by It comprises the following steps: (1) According to the requirements of the spiral pipe spiral outer diameter and pitch, the distance between the pressure rollers L is adjusted, and the mounting angle of the pressure roller and the supporting roller is adjusted to α; (2) The finished straight pipe is sent forward by a required straight pipe length, the pressure roller is lowered by a set amount h, the supporting roller starts to rotate, the finished straight pipe is rotated and advanced by a set length, then the supporting roller is raised, the spiral pipe spiral section forming is completed, and a special spiral pipe is formed.

9. The high-precision solenoid manufacturing method of claim 8, wherein: The distance L between the two pressure rollers is equal to 2P, P is the pitch of the spiral pipe, the pressure roller and the supporting roller rotate perpendicularly to the direction of the roller at a linear speed V, which is decomposed into a horizontal speed V1 and a vertical speed V2, at the same time t, V1xt=P, V2xt=πd, α is arccos(V1 / V), and d is the outer diameter of the spiral pipe.

10. The high-precision solenoid manufacturing method according to claim 8 or 9, characterized by The processing process of the finished straight pipe and the post-processing of the spiral pipe comprises the following steps: S10, after the pipe blank is cold-rolled for multiple passes, the semi-finished pipe is rolled, the deformation amount of each pass is 50% to 80%, the intermediate product after each cold rolling is degreased and cleaned, and the intermediate product is heat treated at a holding temperature of 1000 to 1150 DEG C, the holding time is greater than or equal to 2 minutes, then the pipe is straightened by a straightening machine, the straightness of the pipe after straightening is less than or equal to 1.5 mm / m, and then the pipe is polished by a belt polishing machine; S20, the semi-finished pipe is cold-drawn into a finished straight pipe, and the drawing deformation amount is 18% to 30%; S30, the inner and outer surfaces of the finished straight pipe are degreased, cleaned and wiped clean; S40, the finished straight pipe is subjected to final product heat treatment, the heat treatment temperature is 1060 to 1120 DEG C, the holding time is greater than or equal to 2 minutes, and the cooling time of the pipe from 1060 DEG C to below 500 DEG C is not more than 5 minutes; S50, the finished straight pipe is straightened by a straightening machine, the straightness of the pipe after straightening is less than or equal to 1 mm / m, and then the pipe is polished by a belt polishing machine; S60, the finished straight pipe is subjected to TT heat treatment, heated in vacuum, temperature 700-750 DEG C, holding time >=5h; S70, the finished straight pipe after heat treatment is subjected to spinning to form a spiral pipe; S80, the spiral pipe is subjected to stress relief heat treatment, in vacuum, temperature 700-750 DEG C, holding time >=2h.

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