CN110328533B

CN110328533B - Double-wire metal square and rectangular pipe forming welding unit

Info

Publication number: CN110328533B
Application number: CN201910548304.4A
Authority: CN
Inventors: 杨元恒
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2021-03-16
Anticipated expiration: 2039-06-24
Also published as: CN110328533A

Abstract

The utility model provides a double-line metal square rectangular pipe shaping welding unit, it arranges in proper order and is equipped with double-line decoiler, first shaping section, first welding section, first constant diameter section, double-barrelled flight cutting device and double-line discharge frame, seven double-line horizontal roller frames have been arranged in proper order in first shaping section, be equipped with the 1 st of dislocation alternate arrangement, 2 welding roller in first welding section, be equipped with three sizing double-line horizontal roller frames of arranging in proper order and two sets of 1 st, 2 vertical rolls of arranging with it alternately and two sets of asymmetric correction heads of two pairwise dislocation arrangements in first constant diameter section, in double-barrelled flight cutting device, realize the backward reset motion of pipe cutting dolly through first cylinder. The unit adopts a double-line horizontal parallel production process route to simultaneously produce two metal square and rectangular welded pipes with the same specification and size, can save investment, occupy less area, reduce the number of workers and greatly improve the production efficiency, and is particularly suitable for small metal welded pipe units with the diameter phi of 50mm or less.

Description

Double-wire metal square and rectangular pipe forming welding unit

Technical Field

The invention relates to the technical field of metal welded pipe forming equipment, in particular to a double-line metal square and rectangular pipe forming welding unit.

Technical Field

The existing metal square and rectangular tube forming welding machine set generally welds a circular tube and then deforms the circular tube into a square or rectangular tube. The machine set consists of an uncoiler, a forming section, a welding section, a sizing section, a cutting device and a discharging frame, and is shown in figures 1-2. In fig. 1-2, 51 is an uncoiler, 56 is a shaping section, the shaping section 56 is provided with a plurality of horizontal roll stands 56-1 and a plurality of vertical roll stands 56-2, 57 are welding sections, 57-1 is a welding roll stand, 58 is a sizing section, the section is also provided with a horizontal roll stand 58-1 and a vertical roll stand 58-2, a correcting head (Turkish head) 58-6 is arranged at the tail section of the sizing section 58, and two to three correcting heads deform a round pipe into a square rectangular pipe. The flying cutting device 59 is composed of a pipe cutting frame 59-1 and a pipe cutting trolley 59-2. The pipe cutting frame 59-1 consists of a frame box 59-1-1, a trolley track 59-1-2 and a trolley cylinder 59-1-3. The pipe cutting trolley 59-2 comprises a sawing machine 59-2-1 and a clamping device 59-2-2. The sizing section 58 and the shaping section 56 both use a ganged drive. The transmission system includes a main motor 52, a main speed reducer 53, a distribution gear box 54, a universal joint 55, and a coupling 55-1. And 60 is a discharging frame.

For a high-frequency pipe welding machine set, the welding speed is 100-200 m/min, and cannot be increased any more. To improve yield, two-wire welded tubing is an option. For an argon arc welded pipe unit, the welding speed is 2-15 m/min, and the labor cost is high due to the fact that the welding speed is low. In order to reduce labor cost, two welded pipe units are generally operated by one person at present. If one person operates two or more than two welded pipe units simultaneously, the operating personnel can be caused to patrol the circuit line for a long time, the working strength is high, and the phenomenon that the head and the tail can not be taken into consideration can also occur sometimes.

Disclosure of Invention

The invention aims to solve the technical problem of providing a double-wire metal square and rectangular pipe welding unit, which adopts a double-wire horizontal parallel production process route to simultaneously produce two metal square and rectangular welded pipes with the same specification and size, is particularly suitable for a small metal welded pipe unit (the diameter of the welded pipe is less than or equal to phi 50 mm), can reduce equipment investment and production cost, and can greatly improve the production yield under the conditions of the same floor area and the same number of workers.

The technical solution proposed by the present invention is as follows:

a double-wire metal square rectangular tube forming and welding unit comprises a first main motor 62, a first main speed reducer 63, a first distribution gear box 64 and a first universal joint 65 which are used as a group transmission system of the unit, wherein the double-wire metal square rectangular tube forming and welding unit is sequentially provided with a double-wire uncoiler 61, a first forming section 66, a first welding section 67, a first diameter fixing section 68, a double-pipe flying cutting device 69 and a double-wire unloading frame 70 in an arrangement mode; the first molding section 66 is sequentially provided with seven double-line horizontal roller bases with the same structure, the first double-line horizontal roller base 66-1 is provided with a 1 st lower roller 6-1-6, a 2 nd lower roller 6-1-7, a spacer bush 6-1-5, two shaft sleeves 6-1-3 positioned at the left side and the right side, and the roller width B of the 1 st lower roller 6-1-6 and the 2 nd lower roller 6-1-7_i=2（R_iSin（θ_i/2）+C_i) The distance B between the two far ends of the two shaft sleeves 6-1-3_Ki=2（B_i+H_i）+h_iThe distance B between the central lines of the two metal tube blanks_ji=B_i+h_iWherein i is the number of rolling passes of the forming section, i is 1-7, and theta_iIs the i-th deformation angle, R_iIs the i-th bend radius, C_iIs the ith roll ring width, H_iIs the ith shaft sleeve width h_iThe width of the ith channel spacer bush is wide; two No. 1 welding rollers 67-1-1 and two No. 2 welding rollers 67-1-2 which are arranged in a staggered way are arranged in the first welding section 67; the first diameter section 68 is internally provided with three sizing double-line horizontal roller bases 68-1 which are arranged in sequence and have the same structure, and two groups of the 1 st vertical roller 68-2-1 and the 2 nd vertical roller 68-2-2 which are arranged alternately with the three horizontal roller bases 68-1, wherein the 1 st vertical roller 68-2-1 and the 2 nd vertical roller 68-2-2 of each group are arranged in a staggered manner and are arranged in the first diameter sectionThe three sizing double-line horizontal roller bases 68-1 in the sizing section 68 have the same structure and size parameters as the seventh double-line horizontal roller base 66-7 in the first forming section 66; the tail section of the first diameter section 68 is provided with two asymmetric correction heads 68-6 which are arranged in a staggered manner and have the same structure; the double-pipe flying cutting device 69 consists of a pipe cutting rack 69-1 and a pipe cutting trolley 69-2, and the pipe cutting trolley 69-2 is driven by a piston rod of a first cylinder 69-1-3 to perform backward reset motion on a first guide rail 69-1-2.

The first double-line horizontal roller machine base 66-1 comprises a machine frame 6-1-2, a first roller shaft 6-1-15, a second roller shaft 6-1-1, a shaft sleeve 6-1-3, a spacer bush 6-1-5, bearing seats 6-1-10, a pressing screw 6-1-11, a first upper roller 6-1-8, a first lower roller 6-1-6, a second upper roller 6-1-9 and a second lower roller 6-1-7, wherein the first upper roller 6-1-8 and the second upper roller 6-1-9 are fixedly arranged in the middle of the machine frame 6-1-2 through the first roller shaft 6-1-15 and two bearing seats 6-1-10, and the first lower roller 6-1-6 and the second lower roller 6-1-7 are fixedly arranged in the middle of the machine frame 6-1-2 through the second roller shaft 6-1-1 and two bearing seats 6-1-10 1-10 are fixedly arranged at the lower part of a rack 6-1-2, a spacer bush 6-1-5 is arranged between a 1 st lower roller 6-1-6 and a 2 nd lower roller 6-1-7, shaft sleeves 6-1-3 with the same width are respectively arranged between the 1 st lower roller 6-1-6 and the 2 nd lower roller 6-1-7 and adjacent bearing seats 6-1-10, the 1 st upper roller 6-1-8 and the 1 st lower roller 6-1-6 are matched and paired, the 2 nd upper roller 6-1-9 and the 2 nd lower roller 6-1-7 are matched and paired, and two pressing screws 6-1-11 are respectively hinged with the corresponding bearing seats 6-1-10.

The vertical moving plate 3-1 of the asymmetric correction head 68-6 is in limited sliding connection with four 1 st guide rail blocks 3-1-2 at the left side and the right side, the vertical moving plate 3-1 is driven to move up and down by a 1 st handle 3-1-1, the horizontal moving plate 3-2 is in limited sliding connection with four 2 nd guide rail blocks 3-2-2 at the upper side and the lower side, the horizontal moving plate 3-2 is driven to move left and right by a 2 nd handle 3-2-1, a rotary table 3-3 with a worm wheel rotates for 360 degrees by a worm 3-3-2 and a 3 rd handle 3-3-1, a roller frame 3-5 is connected with the rotary table 3-3 with the worm wheel, a guide groove 3-5-1 is arranged on the roller frame 3-5, a roller bearing seat 3-5-2 is movably arranged in the guide groove 3-5-1, a cross beam 3-5-3 is fixedly arranged at the end part of the roller frame 3-5, an adjusting screw 3-5-4 is arranged between the cross beam 3-5-3 and the roller bearing seat 3-5-2, the roller bearing seat 3-5-2 is driven to move in a guide groove 3-5-1 by the adjusting screw 3-5-4, and a rotary table 3-3 with a worm wheelThe device is connected with a horizontal moving plate 3-2 in an axial sliding manner through a cylinder 3-3-3 with a flange plate, the horizontal moving plate 3-2 is connected with a vertical moving plate 3-1 in a horizontal sliding manner through the limit of a guide rail block 3-2-2 of the No. 2 and a handle 3-2-1 of the No. 2, and the vertical moving plate 3-1 is connected with a back plate 3-4 in a vertical sliding manner through the limit of a guide rail block 3-1-2 of the No. 1 and the handle 3-1-1 of the No. 1; the rollers are arranged by four rollers, and the positions of the side rollers 3-9 and the lower rollers 3-10 are independently adjusted by corresponding adjusting screws 3-5-4; the horizontal directions of the vertical moving plate 3-1, the horizontal moving plate 3-2 and the back plate 3-4 are asymmetrically designed relative to the central line of the 2 nd production line 72, and the distance n = R from the roller shaft center E of the side roller 3-9 to the center O of the 1 st tube blank_T+D_KJ/2, the distance k = n + D from the edge C of the side roller 3-9 to the center O of the 1 st tube blank_jThe distance from the edge F of the 3-1 of the vertical moving plate to the center O of the 1 st tube blank and the outer radius R of the 3-3 rotating disc with a worm wheel_PThe k value and the m value are respectively taken as being less than the distance m from the 3-4 edge G of the back plate to the center O of the 1 st tube blank, and the k value and the m value are less than the distance Bm = B from the center O of the 1 st tube blank to the 3-11 edge H of the 2 nd tube blank_j1-a₁/2。

A pipe cutting frame 69-1 in the double-pipe flight cutting device 69 consists of a frame box body 69-1-1, a first guide rail 69-1-2 and a first cylinder 69-1-3, the first cylinder 69-1-3 fixed on the frame box body 69-1-1 is fixedly connected with a pipe cutting trolley 69-2 through a piston rod, and the bottom of the pipe cutting trolley 69-2 is in sliding connection with the two first guide rails 69-1-2.

The pipe cutting trolley 69-2 in the double-pipe flying cutting device 69 comprises a double-pipe flying saw cutting machine 69-2-1 and a duplex fixture 69-2-2; the double-pipe flying saw sawing machine 69-2-1 comprises a saw blade 9-15 and a chuck plate 9-16 of the saw blade, and the reasonable distance from the lowest point Fj of the chuck plate 9-16 to the highest point Aj of the duplex clamp 69-2-2 is 10-70 mm; the duplex fixture 69-2-2 comprises a 1 st fixture and a 2 nd fixture, wherein the 1 st fixture is provided with a 1 st left module 9-4, a 1 st right module 9-5, a 1 st left support 9-2, a 1 st right support 9-3 and a 1 st connecting piece 9-8, the 1 st left module 9-4 and the 1 st right module 9-5 are respectively in supporting connection with the 1 st left support 9-2 and the 1 st right support 9-3 through screws, the 2 nd fixture is provided with a 2 nd left module 9-7, a 2 nd right module 9-10, a 2 nd left support 9-6, a 2 nd right support 9-11 and a 2 nd connecting piece 9-9, the 2 nd left module 9-7 and the 2 nd right module 9-10 are respectively in supporting connection with the 2 nd left support 9-6 and the 2 nd right support 9-11 through screws, the 1 st right support 9-3 and the 2 nd right support 9-11 are fixed on a bottom plate 9-18 of a pipe cutting trolley 69-2, one end of a second guide rail 9-12 is fixed on a guide rail fixing seat 9-1, the 1 st left support 9-2 and the 2 nd left support 9-6 are in sliding connection with the second guide rail 9-12, the 1 st left support 9-2 is fixedly connected with a second piston rod 9-13 through a 1 st connecting piece 9-8, and the 2 nd left support 9-6 is fixedly connected with the second piston rod 9-13 through a 2 nd connecting piece 9-9.

Compared with the prior art, the invention has the following remarkable effects:

(1) the double-wire metal square and rectangular pipe forming and welding machine set adopts the double-wire uncoiler, the double-wire horizontal roller base, the welding roller of the first welding section and the asymmetric correction head of the first diameter section, and four vertical rollers and four asymmetric correction heads of the first diameter section adopt staggered arrangement and double-pipe flying cutting devices to form a double-wire horizontal production process route, can simultaneously produce two metal square and rectangular welded pipes with the same specification and size, and is particularly suitable for a small metal welded pipe machine set with the diameter of the welded pipe being less than or equal to phi 50 mm. Compared with the prior art, the method can save nearly fifty percent of occupied area of the field.

(2) Due to the adoption of the double-wire welded pipe process line, the labor cost can be saved by fifty percent.

(3) The same two-wire welded pipe unit can produce two metal welded pipes with the same specification and size at the same time, and the two welded pipes with the same specification and size can be adjusted together, so that the welding machine is convenient and fast to use, and is high in production efficiency.

(4) Because the welding roll, the vertical roll and the asymmetric correction head are arranged in a staggered manner, the vertical roll, the welding roll and the asymmetric correction head can be independently adjusted, and the welding roll, the vertical roll and the asymmetric correction head are convenient and quick.

(5) Can save the equipment investment and reduce the production cost.

Drawings

FIG. 1 is a schematic top view of the overall arrangement of a conventional square and rectangular welded pipe machine set.

Fig. 2 is a schematic front view of the overall arrangement of the conventional square and rectangular welded pipe mill set shown in fig. 1.

FIG. 3 is a schematic top view of the overall arrangement of the twin wire square and rectangular pipe forming welder set of the present invention, showing the roller gang drive system.

FIG. 4 is a schematic front view of the general arrangement of the two wire square rectangular pipe forming welder unit shown in FIG. 3, without the roller cluster drive system shown.

FIG. 5 is a schematic view of the first two-wire horizontal roll stand configuration of the first forming section shown in FIG. 3.

FIG. 6 is a schematic top view of the first double-line horizontal roll stand configuration of the first forming section of FIG. 5 without showing the 1 st upper roll, the 2 nd upper roll and the 1 st roll shaft.

FIG. 7 is a schematic left side view of the first twin-line horizontal roll stand configuration of the first forming section shown in FIG. 5.

FIG. 8 is a schematic view of the two lower roll rows of the fifth twin-wire horizontal roll stand of the first forming section shown in FIG. 3.

FIG. 9 is a schematic diagram of a first gauge section edger roll arrangement shown in FIG. 3.

Fig. 10 is a front view of the first gauge section asymmetric orthotic head shown in fig. 3.

Fig. 11 is a left side view of the first gauge section asymmetric orthotic head shown in fig. 10.

Fig. 12 is a view of the first pass roll hole pattern of the first gauge section asymmetric correction head round squaring shown in fig. 3.

Fig. 13 is a diagram of a first gauge section asymmetric correction head round-to-square second pass roll bore pattern shown in fig. 3.

Fig. 14 is a view of a first pass roll hole pattern of the first gauge section asymmetric correction head round to rectangular shown in fig. 3.

Fig. 15 is a circular to rectangular second pass roll bore pattern for the first gauge section asymmetric correction head shown in fig. 3.

Fig. 16 is a schematic diagram of the arrangement of the duplex fixture, the second air cylinders 9-14 and the double-tube flying saw and saw cutting machine in the double-tube flying cutting device shown in fig. 3.

FIG. 17 is a top schematic view of FIG. 16, without the double flying saw blade shown.

FIG. 18 is a schematic diagram of the arrangement of the double pipe flying saw and the duplex fixture shown in FIG. 16.

Detailed Description

The present invention is further illustrated by the following examples.

Example 1

Referring to fig. 3 to 18, a double-wire metal square rectangular tube forming and welding unit comprises a first main motor 62, a first main speed reducer 63, a first distribution gear box 64 and a first universal joint 65 which are used as a group transmission system of the unit, wherein the double-wire metal square rectangular tube forming and welding unit is sequentially provided with a double-wire uncoiler 61, a first forming section 66, a first welding section 67, a first diameter section 68, a double-pipe flight cutting device 69 and a double-wire discharging frame 70 in an arrangement manner; the first molding section 66 is sequentially provided with seven double-line horizontal roller bases with the same structure, the first double-line horizontal roller base 66-1 is provided with a 1 st lower roller 6-1-6, a 2 nd lower roller 6-1-7, a spacer bush 6-1-5, two shaft sleeves 6-1-3 positioned at the left side and the right side, and the roller width B of the 1 st lower roller 6-1-6 and the 2 nd lower roller 6-1-7_i=2（R_iSin（θ_i/2）+C_i) The distance B between the two far ends of the two shaft sleeves 6-1-3_Ki=2（B_i+H_i）+h_iThe distance B between the central lines of the two metal tube blanks_ji=B_i+h_iWherein i is the number of rolling passes of the forming section, i is 1-7, and theta_iIs the i-th deformation angle, R_iIs the i-th bend radius, C_iIs the ith roll ring width, H_iIs the ith shaft sleeve width h_iThe width of the ith channel spacer bush is wide; two No. 1 welding rollers 67-1-1 and two No. 2 welding rollers 67-1-2 which are arranged in a staggered way are arranged in the first welding section 67; the first diameter section 68 is internally provided with three sizing double-line horizontal roller bases 68-1 which are arranged in sequence and have the same structure, and two groups of the 1 st vertical roller 68-2-1 and the 2 nd vertical roller 68-2-2 which are arranged alternately with the first diameter section, the 1 st vertical roller 68-2-1 and the 2 nd vertical roller 68-2-2 of each group are arranged in a staggered manner, and the three sizing double-line horizontal roller bases 68-1 arranged in the first diameter section 68 are identical to the seventh double-line horizontal roller base 66-7 arranged in the first molding section 66 in structure and size parameters; the tail section of the first diameter section 68 is provided with two asymmetric correction heads 68-6 which are arranged in a staggered manner and have the same structure; the double tube flyThe line cutting device 69 consists of a pipe cutting frame 69-1 and a pipe cutting trolley 69-2, and the pipe cutting trolley 69-2 is driven by a piston rod of a first air cylinder 69-1-3 to perform backward reset movement on a first guide rail 69-1-2.

The vertical moving plate 3-1 of the asymmetric correction head 68-6 is in limited sliding connection with four 1 st guide rail blocks 3-1-2 at the left side and the right side, the vertical moving plate 3-1 is driven to move up and down by a 1 st handle 3-1-1, the horizontal moving plate 3-2 is in limited sliding connection with four 2 nd guide rail blocks 3-2-2 at the upper side and the lower side, the horizontal moving plate 3-2 is driven to move left and right by a 2 nd handle 3-2-1, a rotary table 3-3 with a worm wheel rotates for 360 degrees by a worm 3-3-2 and a 3 rd handle 3-3-1, a roller frame 3-5 is connected with the rotary table 3-3 with the worm wheel, a guide groove 3-5-1 is arranged on the roller frame 3-5, a roller bearing seat 3-5-2 is movably arranged in the guide groove 3-5-1, a cross beam 3-5-3 is fixedly arranged at the end part of the roller frame 3-5, an adjusting screw 3-5-4 is arranged between the cross beam 3-5-3 and the roller bearing seat 3-5-2, the roller bearing seat 3-5-2 is driven to move in the guide groove 3-5-1 by the adjusting screw 3-5-4, the rotary table 3-3 with the worm wheel is axially and slidably connected with the horizontal moving plate 3-2 through the cylinder 3-3-3 with the flange plate, the horizontal moving plate 3-2 is horizontally and slidably connected with the vertical moving plate 3-1 through the limit of the 2 nd guide rail block 3-2-2 and the 2 nd handle 3-2-1, and the vertical moving plate 3-1 is vertically connected with the back plate 3-4 through the limit of the 1 st guide rail block 3-1-2 and the 1 st handle 3-1-1.The straight direction sliding connection is realized; the rollers are arranged by four rollers, and the positions of the side rollers 3-9 and the lower rollers 3-10 are independently adjusted by corresponding adjusting screws 3-5-4; the horizontal directions of the vertical moving plate 3-1, the horizontal moving plate 3-2 and the back plate 3-4 are asymmetrically designed relative to the central line of the 2 nd production line 72, and the distance n = R from the roller shaft center E of the side roller 3-9 to the center O of the 1 st tube blank_T+D_KJ/2, the distance k = n + D from the edge C of the side roller 3-9 to the center O of the 1 st tube blank_jThe distance from the edge F of the 3-1 of the vertical moving plate to the center O of the 1 st tube blank and the outer radius R of the 3-3 rotating disc with a worm wheel_PThe k value and the m value are respectively taken as being less than the distance m from the 3-4 edge G of the back plate to the center O of the 1 st tube blank, and the k value and the m value are less than the distance Bm = B from the center O of the 1 st tube blank to the 3-11 edge H of the 2 nd tube blank_j1-a₁/2。

The invention adopts a method of welding into a round tube and then forming into a square or rectangular tube, wherein the forming into the square tube is completed by two to three asymmetric correction heads, as shown in figures 12 and 13, the round tube is firstly changed into a box-shaped tube consisting of four main circular arcs, and the arc length of each main circular arc corresponds to the side length A of the cross section of a finished product_TRadius of main arc R_AIncreasing the diameter of the connecting arc r connecting the main arcs in a track-by-track manner₁Radius r equal to the radius of the fillet of the finished product_TAnd finally forming a square tube. Similarly, the circular tube is formed into a rectangular tube by two to three asymmetric correction heads, as shown in fig. 14 and 15.

The double-wire metal square and rectangular pipe forming and welding unit can simultaneously form, weld, size, round into square and rectangular pipes, cut off and unload two paths of welded pipes with the same specification and size through a first production line 71 and a second production line 72 which are horizontally and parallelly arranged. Two metal strips are arranged on the double-wire uncoiler 61; in the first production line 71, the 1 st metal belt 6-1-2 sequentially passes through the 1 st wire roller 66-1-1 of the first to seventh double-wire horizontal roller stands of the first forming section, enters the 1 st welding roller 67-1-1, passes through the 1 st wire roller 68-1-1 of the sizing double-wire horizontal roller stand 68-1 of the first sizing section, enters the 1 st wire roller and the 1 st vertical roller such as the 1 st vertical roller 68-2-1 and the like, and then enters the two asymmetric correction heads 68-6 of the 1 st wire for round squaring and rectangle. Similarly, in the second production line 72, the 2 nd metal strip 6-1-13 passes through seven horizontal rolls such as the 2 nd wire roll 66-1-2 of the first forming section, enters the 2 nd welding roll 67-1-2, passes through the 2 nd wire roll 68-1-2 of the first diameter section, enters three 2 nd wire rolls such as the 2 nd vertical roll 68-2-2 and the 2 nd vertical roll, and enters the two asymmetric correction heads 68-6 of the 2 nd wire for round squaring and rectangle changing. A double-tube flying saw cutting machine 69-2-1 simultaneously saw two metal square and rectangular tubes, and a double-wire discharging frame 70 simultaneously discharges the two metal square and rectangular tubes.

Example 2

Referring to fig. 3-18, this embodiment uses a double wire metal square rectangular tube forming and welding assembly of 40 x 40mm (diameter phi 50.8mm) in construction and arrangement similar to that of embodiment 1, which can produce square rectangular tubes of 25 x 25mm, 30 x 20mm, 30 x 30mm, 38 x 25, 40 x 20 and 40 x 40mm, etc.

Taking the example of producing two welded pipes of 40 × 1.0mm (corresponding to the diameter of a round pipe of phi 50.8 × 1.0mm) at the same time, adopting a circumference forming method to design a hole pattern, calculating the width of a roller, determining the distance between two ends of a roller sleeve between a forming section and a sizing section double-line horizontal roller base, calculating the diameter of a vertical roller and verifying the rationality of the vertical roller, determining the size of an asymmetric correcting head structure and verifying the rationality of the asymmetric correcting head structure, and determining the size of a position structure of a double-pipe flying saw cutting machine and a double-joint clamp and verifying the rationality of the double-pipe flying saw.

The number of the open hole machine bases (rough forming sections) is 4, and the number of the closed hole machine bases (fine forming sections) is 3.

Width B of tube blank_w=158mm。

Taking the first deformation angle as theta₁=96°。

The deformation angles of the first path to the fifth path are distributed in an equal mode.

Deformation angle theta of i-th path_i=θ₁+(i-1)(θ₅-θ₁) N, taken as θ₅=324 °; the number N =4 of the open hole double-line horizontal roller bases; the number i of rolling passes is 2-5.

The ith bend radius R_i=57.3×B_w/θ_i(ii) a And i is 2-5.

And taking the average value between the fifth pass and the welding roller by the sixth pass of deformation angle: theta₆=θ₅+（360-θ₅)/2=324+18=342°

And taking the average value between the sixth deformation angle and the welding roller: theta₇=θ₆+（360-θ₆)/2=342+9=351°

Width B of guide piece_i=2R_i×sin((360-θ_i) 2); and i is 5-7.

The distance between the two ends of the first rolling roll shaft sleeve to the fourth rolling roll shaft sleeve is the same. The distance between the two ends of the first two roll shaft sleeves is calculated as the standard. In FIG. 6, 6-1-1 is the 2 nd roll shaft, 6-1-2 is the frame, 6-1-3 is the shaft sleeve, the width H of the shaft sleeve₁Taking 20mm, 6-1-4 as a roll collar, and preparingWidth of roll ring C₁Taking a spacer sleeve with the width of 14mm and 6-1-5 as₁42mm, 6-1-6 as the 1 st lower roller, and 6-1-7 as the 2 nd lower roller. Calculated according to the above parameters to obtain₁=96°，R₁=94.31mm, roll width B of 1 st, 2 nd rolls 6-1-6, 6-1-7 th₁=2(R₁sin(θ₁/2)+C₁) =168.18mm, and the distance B between the two ends of the two shaft sleeves 6-1-3_k1=2(B₁+H₁)+h₁=418.34mm, the distance B between the central lines of the two tube blanks_j1=B₁+h₁=210.18 mm. The adjacent edges of the 1 st metal strip 6-1-12 and the 2 nd metal strip 6-1-13 are spaced by a distance T_j=B_j1-B_w=52.18mm。

The distances between two ends of two roll shaft sleeves of the third sizing double-line horizontal roll stand from the fifth to the seventh and the first sizing section are the same. And calculating the distance between the two ends of the two roll shaft sleeves in the fifth pass. In FIG. 8, 6-5-1 is the 4 th roll shaft, 6-5-2 is the 1 st frame, 6-5-3 is the 1 st shaft sleeve, and the 1 st shaft sleeve has a width H₅Taking 20mm, 6-5-4 as the 1 st roller ring, the 1 st roller ring width C₅Taking the diameter of the roller to be 14mm, taking 6-5-5 as a 1 st spacer bush, taking 6-5-6 as a 3 rd lower roller, taking 6-5-10 as a 1 st bearing seat, and taking 6-5-7 as a 4 th lower roller. Calculated according to the above parameters to obtain₅=324°，R₅=27.94 mm. 3 rd and 4 th roller widths B of rollers 6-5-6 and 6-5-7₅=2(R₅+C₅) =83.88mm, since the distance between the centre lines of the two tube blanks remains constant, i.e. B_j1=B_j51 st spacer 6-5-5 h wide₅=B_j1-B₅=126.30mm, distance B between two ends of two 1 st shaft sleeves 6-5-3_k5=2(H₅+B₅)+h₅=334.06mm。

In FIG. 9, 8-1 is the first diameter segment vertical roll axis, the diameter d of which_O30mm, 8-2 is a vertical roll with a first diameter section, and the bottom diameter D of the vertical roll_kTaking 100mm as an end S as a roll gap between 8-2 two vertical rolls, taking 2mm as an end, taking the radius of a roll pass of the roll as R_T=25.4mm, 8-3 and 8-4 being the 1 st and 2 nd tube billet cross sections, S, respectively_jThe center distance of the sections of the No. 1 and No. 2 tube blanks is 8-3, 8-4, S_j=B_j1. Diameter D of vertical roll_n=D_k+2R_T-∆S=1488mm, visible, significantly less than S_j=B_j1And =210.18mm, so the offset arrangement of the vertical roller bases of the first diameter section is feasible.

In this example, the rounding and squaring are performed by using two asymmetric correction heads having four rolls, as shown in fig. 10 and 11. The roll pass can be placed at any angle, and for convenience of description, the roll pass is placed in the horizontal direction. The first hole pattern of the forming block is shown in fig. 12, the second hole pattern of the forming block is the final product channel, and the second hole pattern of the forming block is shown in fig. 13. In this example, the length of the side of the finished square tube is A_T40mm, a wall thickness t of 1.0mm, a square first pass central corner radius r₁Taking the corner radius r of the finished square tube_TRadius r of corner of finished square tube_TTaken at 1.35t +0.2=1.55mm, r₁=r_T=1.55mm, diameter d of roll shaft of asymmetric correction head_ojIs phi 30mm, take A₁=A_T-0.76=39.24mm, square first pass roll pass radius of arc R_AGet A_T1.5 times of (A), R_A=1.5A_T=1.5 × 40mm =60mm, the reduction coefficient μ is 1.01, and the central angle α =57.3(μ a) corresponding to the arc of the square roll pass is taken_T-2r₁+3.14*r₁/2)/R_A=37.94 °, pass width a₁=2（（R_A-r₁）sin(α/2）+r₁cos(α/2)+R_A(1-cos (α/2))) =46.98mm, roll base diameter D_kjTaking 140mm, the diameter D of a roller_j=D_kj+2R_A(1-cos (α/2)) =146.48mm, distance n of roll shaft center E of side roll 3-9 to center O of 1 st tube blank = (a)₁+D_kj) 2=93.49mm, and the distance k = n + D from the edge C of the side roller 3-9 to the center O of the 1 st tube blank_jThe thickness of the tube blank is/2 =166.73mm, the distance from the edge F of the 3-1 of the vertical moving plate to the center O of the 1 st tube blank is 160mm, the outer radius Rp of the 3-3 of the rotating disc with the worm wheel is 150mm, and the inner radius r_pThe distance m from the edge G of the back plate 3-4 in the minor axis direction to the center O of the 1 st tube blank is 180mm and is smaller than the distance B from the center O of the 1 st tube blank to the edge H of the 2 nd tube blank 3-11_m=B_j1-a₁/2=210.18-46.98/2=186.69mm, it can be seen that two asymmetric correction heads in a misaligned arrangement do not affect each other.

In FIGS. 16 to 18, the first and second electrodes are shown,9-15 is a saw blade, R_jRadius of the saw blade, where R_jTaking 165mm as chuck of saw blade, 9-16 as_jIs the chuck radius, r_jTaken to be 50 mm. The distance between the center lines of the 1 st and the 2 nd tube blanks 9-19 and 9-20 is B_j1，C_jTaking C as the distance from the top end of the 1 st or 2 nd tube blank to the top surface of the module of the 1 st or 2 nd clamp_j5mm, and the central point of the saw blade 9-15 is O_jThe central point of the No. 1 tube blank 9-19 is E_jOver center point O_jPerpendicular to (A) is OD, through E_jThe intersection point of the horizontal line and the vertical line OD of the point is B_jΔ in triangle_jE_jB_jIn, E_jB_j=(A_T+B_j1)/2，a=Sin^-1（E_jB_j/R_j）=49.3°_，O_jB_j=R_jcosa =107.6mm, lowest point F of chuck 9-16_jPoint to the highest point A of the 1 st or 2 nd clamp_jA distance of_jF_JAs can be seen from fig. 18,

A_jF_j=O_jB_j-A_jB_j-r_j=R_Jcosa-A_T-C_j-r_j=12.6mm

A_jF_jthe value is reasonable between 10mm and 70 mm.

Example 3

Referring to fig. 3 to 18, a 40 x 40mm (diameter phi 50.8mm) double-wire square rectangular metal pipe forming welding set is selected, and the structure and the arrangement are the same as those of the embodiment 1. By way of example, two 30 × 20 × 1.0mm (corresponding to a diameter of 31.8 × 1.0mm) welded tubes are produced simultaneously, and a hole pattern is designed by means of a circular forming method.

Width B of tube blank_w=98mm。

Taking the first deformation angle as theta₁=96°。

Deformation angle theta of i-th path_i=θ₁+(i-1)(θ₅-θ₁) N, taken as θ₅=324 °; the number N =4 of the horizontal roller bases with the double openings; the number i of rolling passes is 2-5.

The ith bend radius R_i=57.3×B_w/θ_i(ii) a And i is 2-5.

The fifth to seventh passages are closed holes.

Width B of guide piece_i=2R_i×sin((360-θ_i) 2); and i is 5-7.

The distance between the two ends of the first rolling roll shaft sleeve to the fourth rolling roll shaft sleeve is the same. The distance between the two ends of the first two roll shaft sleeves is calculated as the standard. In FIG. 6, the roller ring 6-1-4 is wide C₁Taking the spacer bush as 10mm and 6-1-5 h wide₁Taking the diameter of 62mm, and calculating the parameters according to the parameters to obtain theta for producing welded pipes with the diameter of 31.8mm₁=96°，R₁=58.49mm, roll width B of 1 st and 2 nd rolls 6-1-6, 6-1-7₁=2(R₁sin(θ₁/2) + C1) =106.93 mm. Distance B between central lines of two tube blanks_j1=B₁+h₁=168.93 mm. Two ends of the same unit, two shaft sleeves 6-1-3 are spaced by a distance B_k1Same as example 2, the sleeve 6-1-3 was wide H₁=（B_k1-2B₁-h₁）/2=71.24mm。

The distances between two ends of two roll shaft sleeves of the third sizing double-line horizontal roll stand from the fifth to the seventh and the first sizing section are the same. And calculating the distance between the two ends of the two roll shaft sleeves in the fifth pass. In FIG. 8, the 1 st roll collar 6-5-4 is wide C₅Taking the diameter as 10mm, and calculating according to the parameters to obtain theta₅=324°，R₅=17.33 mm. The roll widths B of the 3 rd and 4 th rolls 6-5-6 and 6-5-7₅=2(R₅+C₅) =54.66mm, due to B_j1=B_j5=168.93mm, 1 st spacer 6-5-5 th wide h₅=B_j1-B₅=114.27 mm. Due to the sameUnit, two roll shaft sleeves with two ends separated by B_K5Remains unchanged, B_k5=B_K11 st shaft sleeve 6-5-3H wide₅=（B_k1-2B₅-h₅）/2=55.24mm。

In FIG. 9, 8-1 is the vertical roll axis of the first diameter section, the diameter d of which_o30mm, 8-2 is a vertical roll with a first diameter section, and the bottom diameter D of the vertical roll_kTaking 100mm as an end S as a roll gap between 8-2 two vertical rolls, taking 2mm as an end S, and taking the radius of a round pipe blank before the roll hole type radius is a rectangular pipe as R_T=15.9mm, 8-3 and 8-4 being the 1 st and 2 nd tube billet cross sections, S, respectively_jThe center distance of the sections of the No. 1 and No. 2 tube blanks is 8-3, 8-4, S_j=B_j1. Diameter D of vertical roll_n=D_k+2R_T- [ S =129.8mm, it is obviously smaller than B_j1And =168.93mm, the offset arrangement of the vertical roller bases of the first diameter section is feasible.

In this example, the rounding-to-rectangle forming is performed by using two asymmetric correction heads, and the asymmetric correction heads are arranged in four rolls, as shown in fig. 10 and 11. The roll pass can be placed at any angle, and for convenience of description, the roll pass is placed in the horizontal direction. The rectangular first hole pattern is shown in fig. 14, the rectangular second hole pattern is shown in fig. 15, and the second hole pattern is shown in the finished product channel. In this example, the length of the major axis A of the finished rectangular tube_TIs 30mm and the minor axis side length B_T20mm, wall thickness t 1.0mm, corner radius r in the pass₁Taking the corner radius r of the finished rectangular pipe_TRadius r of corner of rectangular pipe_TTaking the diameter d of a roll shaft of the asymmetric correction head as 1.35t +0.2=1.55mm_ojThe diameter is 25mm, the radius of the first pass of the rectangular roll pass circular arc is 1.5 times of the side length of the finished pipe, the long axis direction R_A=1.5A_T=1.5 × 30mm =45mm, minor axis direction, R_B=1.5*B_T=1.5 × 20=30mm, and the central angle corresponding to the first rectangular roll pass circular arc with the diameter reduction coefficient μ of 1.01 is: long axis direction, α =57.3(μ a)_T-2r₁+п*r₁/2)/R_A=57.3(1.01 × 30-2 × 1.55+3.14 × 1.55/2)/45=37.73 °; minor axis direction, β =57.3(μ B)_T-2r₁+п*r_T/2)/R_B=37.31 °, pass width a₁=2（（R_A-r₁）sin(α/2）+r₁cos(β/2）+R_B(1-cos (beta/2))) =34.04mm, groove height b₁=2（（R_B-r_1）sin(β/2）+r₁(cos(α/2))+R_A(1-cos (α/2))) =26.06mm, roll base diameter D_kjTaking a roll diameter D of 140mm in the horizontal direction_j=D_kj+2R_B(1-cos (β/2)) =143.0mm, distance n = (a) between roll shaft center E of side roll 3-9 and center O of 1 st stock pipe₁+D_kj) 2=87.02mm, and the distance k = n + D from the edge C of the side roller 3-9 to the center O of the 1 st tube blank_jThe thickness of the tube blank is/2 =158.52mm, the distance from the edge F of the 3-1 of the vertical moving plate to the center O of the 1 st tube blank is 160mm, the outer radius Rp of the 3-3 of the rotating disc with the worm wheel is 150mm, and the inner radius r_pThe distance m from the edge G of the back plate 3-4 in the minor axis direction to the center O of the 1 st tube blank is 180mm and is smaller than the distance B from the center O of the 1 st tube blank to the edge H of the 2 nd tube blank 3-11_m=B_j1-a₁And/2 =210.18-17.02=193.16mm, it can be seen that two asymmetric correction heads arranged in a staggered manner do not affect each other.

In FIGS. 16 to 18, 9-15 is a saw blade, R_jRadius of the saw blade, where R_jTaking 165mm as chuck of saw blade, 9-16 as_jIs the chuck radius, r_jTaken to be 50 mm. The distance between the center lines of the 1 st and the 2 nd tube blanks 9-19 and 9-20 is B_j1，C_jTaking C as the distance from the top end of the 1 st or 2 nd tube blank to the top surface of the module of the 1 st or 2 nd clamp_j5mm, and the central point of the saw blade 9-15 is O_jThe central point of the No. 1 tube blank 9-19 is E_jOver center point O_jPerpendicular to (A) is OD, through E_jThe intersection point of the horizontal line and the vertical line OD of the point is B_jΔ in triangle_jE_jB_jIn, E_jB_j=(A_T+B_j1)/2，a=Sin^-1（E_jB_j/R_j）=37.07°_，O_jB_j=R_jcosa =131.65mm, lowest point F of chuck 9-16_jPoint to the highest point A of the 1 st or 2 nd clamp_jA distance of_jF_JAs can be seen from fig. 18,

A_jF_j=O_jB_j-A_jB_j-r_j=R_Jcosa-A_T-C_j-r_j=56.65mm

A_jF_jthe value is reasonable between 10mm and 70 mm.

Example 4

Referring to fig. 3 to 18, a double-wire metal square rectangular pipe forming welding set with a diameter of 24.2mm (25 × 13mm) was used, and the structure and arrangement thereof were the same as those of example 1, and square rectangular pipes with the same outer diameters of 10 × 10mm, 20 × 10mm, 16 × 16mm, 19 × 19mm and 25 × 13mm were produced.

By way of example, two 25 × 13 × 0.8mm (corresponding to a diameter of 24.2 × 0.8mm) welded tubes are produced simultaneously, and a hole pattern is designed by means of a circular forming method.

Width B of tube blank_w=74.2mm。

Taking the first deformation angle as theta₁=96°。

The ith bend radius R_i=57.3×B_w/θ_i(ii) a And i is 2-5.

The fifth to seventh passages are closed holes.

Width B of guide piece_i=2R_i×sin((360-θ_i) 2); and i is 5-7.

The distance between the two ends of the first rolling roll shaft sleeve to the fourth rolling roll shaft sleeve is the same. With two roll shaft sleeves at two ends of the first passThe pitch calculation is standard. In FIG. 6, the width of the sleeve 6-1-3 is H₁Is 20mm, the width of the roll collar is 6-1-4C₁Taking the spacer bush as 10mm and 6-1-5 h wide₁Is taken as 82mm and is obtained by calculation according to the parameters, theta₁=96°，R₁=44.29mm, roll width B of 1 st and 2 nd rolls 6-1-6, 6-1-7₁=2(R₁sin(θ₁/2)+C₁) =85.82mm, and the distance B between the two ends of the two shaft sleeves 6-1-3_k1=2(B₁+H₁)+h₁=293.64mm, and the distance B between the centers of the two tube blanks_j1=B₁+h₁=167.82 mm. The adjacent edges of the 1 st metal strip 6-1-12 and the 2 nd metal strip 6-1-13 are spaced by a distance T_j=B_j1-B_w=93.62mm。

The distances between two ends of two roll shaft sleeves of the third sizing double-line horizontal roll stand from the fifth to the seventh and the first sizing section are the same. And calculating the distance between the two ends of the two roll shaft sleeves in the fifth pass. In FIG. 8, the 1 st sleeve 6-5-3 is H wide₅Taking the width C of a 1 st roll collar of 20mm and 6-5-4₅Taking the diameter as 10mm, and calculating according to the parameters to obtain theta₅=324°，R₅Width B of rollers 6-5-6 and 6-5-7 at No. 3 and No. 4 of rollers 13.12mm₅=2(R₅+C₅) =46.24mm, since the distance between the centre lines of the two tube blanks remains constant, i.e. B_j1=B_j51 st spacer 6-5-3 h wide₅=B_j1-B₅=121.58mm, and the distance B between two ends of two roll shaft sleeves_k5=2(H₅+B₅)+h₅=254.06mm。

In FIG. 9, 8-1 is the vertical roll axis of the first diameter section, the diameter d of which_oIs a vertical roller with phi of 25mm and 8-2 of a first diameter section, and the bottom diameter D of the vertical roller_kThe radius of a round pipe blank is 80mm, and the radius of a roll pass is R before the roll pass is formed into a rectangular pipe_TΔ S is the roll gap between two vertical rolls 8-2, 2mm, 8-3 and 8-4 are respectively the 1 st and 2 nd tube blank sections, S_jThe center distance of the sections of the No. 1 and No. 2 tube blanks is 8-3, 8-4, S_j=B_j1. Diameter D of vertical roll_n=D_k+2R_T- [ S =102.2mm ], it is obviously smaller than B_j1And =167.82mm, the offset arrangement of the vertical roller bases of the first diameter section is feasible.

In the present example, the number of the first and second,two asymmetric straightening heads are adopted to finish the round-to-rectangular forming, and rollers of the asymmetric straightening heads are arranged in four rollers, as shown in fig. 10 and 11. The roll pass can be placed at any angle, and for convenience of description, the roll pass is placed in the horizontal direction. The rectangular first pass of the roll hole pattern is shown in figure 14, the rectangular second pass is the final pass, and the second pass of the roll hole pattern is shown in figure 15. In this example, the length of the major axis A of the finished rectangular tube_TIs 25mm, minor axis side length B_T13mm, a wall thickness t of 0.8mm, and a radius r of a hole-type middle corner₁Taking the corner radius r of the finished rectangular pipe_TRadius r of corner of rectangular pipe_TTaking the diameter d of a roll shaft of the asymmetric correction head as 1.35t +0.2=1.28mm_ojThe diameter is 25mm, the radius of the first pass of the rectangular roll pass circular arc is 1.5 times of the side length of the finished pipe, the long axis direction R_A=1.5A_T=1.5 × 25mm =37.5mm, minor axis direction, R_B=1.5*B_T=1.5 × 13=19.5mm, and the central angle corresponding to the circular arc of the first pass of the rectangular roll pass is determined by taking the diameter reduction coefficient μ as 1.01: long axis direction, α_A=57.3(μA_T-2r₁+п*r₁/2)/R_A=57.3(1.01 × 25-2 × 1.28+3.14 × 1.28/2)/37.5=37.74 °; minor axis direction, β =57.3(μ B)_T-2r₁+п*r_T/2)/R_BAnd =36.96 degrees, pass width a₁=2（（R_A-r₁）sin(α/2）+r₁cos(β/2）+R_B(1-cos (beta/2))) =27.94mm, groove height b₁=2（（R_B-r_1）sin(β/2）+r₁(cos(α/2))+R_A(1-cos (α/2))) =18.03mm, roll base diameter D_kjTaking a roller diameter D of 130mm in the horizontal direction_j=D_kj+2R_B(1-cos (β/2)) =132.10mm, distance n = (a) between roll shaft center E of side roll 3-9 and center O of 1 st tube blank₁+D_kj) /2=78.97mm, and the distance k = n + D from the edge C of the side roller 3-9 to the center O of the 1 st tube blank_jThe thickness of the tube blank is/2 =145.02mm, the distance from the edge F of the 3-1 of the vertical moving plate to the center O of the 1 st tube blank is 130mm, the outer radius Rp of the 3-3 of the rotating disc with the worm wheel is 130mm, and the inner radius r_pThe distance m from the edge G of the back plate 3-4 in the minor axis direction to the center O of the 1 st tube blank is 150mm and is smaller than the distance from the center O of the 1 st tube blank to the edge H of the 2 nd tube blank 3-11B_m=B_j1-a₁/2=167.82-13.97=153.85mm, it can be seen that two asymmetric correction heads in a misaligned arrangement do not affect each other.

In FIGS. 16 to 18, 9-15 is a saw blade, R_jRadius of the saw blade, where R_jTaking 135mm as chuck of saw blade 9-16 as_jIs the chuck radius, r_jThe diameter was taken to be 40 mm. The distance between the center lines of the 1 st and the 2 nd tube blanks 9-19 and 9-20 is B_j1，C_jTaking C as the distance from the top end of the 1 st or 2 nd tube blank to the top surface of the module of the 1 st or 2 nd clamp_j5mm, and the central point of the saw blade 9-15 is O_jThe central point of the No. 1 tube blank 9-19 is E_jOver center point O_jPerpendicular to (A) is OD, through E_jThe intersection point of the horizontal line and the vertical line OD of the point is B_jΔ in triangle_jE_jB_jIn, E_jB_j=(A_T+B_j1)/2，a=Sin^-1（E_jB_j/R_j）=45.57°_，O_jB_j=R_jcosa =94.5mm, lowest point F of chuck 9-16_jPoint to the highest point A of the 1 st or 2 nd clamp_jA distance of_jF_JAs can be seen from fig. 18,

A_jF_j=O_jB_j-A_jB_j-r_j=R_Jcosa-A_T-C_j-r_j=36.5mm

A_jF_jthe value is reasonable between 10mm and 70 mm.

Example 5

Referring to fig. 3 to 18, a 25 × 13mm (diameter Φ 24.2 mm) double-wire square rectangular metal pipe forming welding set was used, the structure and arrangement thereof were the same as in example 1, and hole pattern design was performed by a circular forming method, taking as an example two 10 × 0.5mm (diameter Φ 12.7 × 0.5mm) welded pipes were produced simultaneously.

Width B of tube blank_w=40mm。

Taking the first deformation angle as theta₁=96°。

The ith bend radius R_i=57.3×B_w/θ_i(ii) a And i is 2-5.

The fifth to seventh passages are closed holes.

Width B of guide piece_i=2R_i×sin((360-θ_i) 2); and i is 5-7.

The distance between the two ends of the first rolling roll shaft sleeve to the fourth rolling roll shaft sleeve is the same. The distance between the two ends of the first two roll shaft sleeves is calculated as the standard. In FIG. 6, the roller ring 6-1-4 is wide C₁Taking the spacer bush as 10mm and 6-1-5 h wide₁Taking the diameter of the tube as 102mm, and calculating the diameter of the tube with the diameter of phi 12.7mm according to the parameters to obtain theta₁=96°，R₁Width of rollers (B) =23.88mm, 1 st and 2 nd rollers (6-1-6, 6-1-7)₁=2(R₁sin(θ₁/2)+C₁) =55.49 mm. Center distance B between two tube blanks_j1=B₁+h₁=157.49 mm. Due to the same unit, the distance B between the two ends of the two shaft sleeves 6-1-3_k1Shaft sleeves 6-1-3H as in example 4₁=（B_k1-2B₁-h₁）/2=40.33mm。

The distances between two ends of two roll shaft sleeves of the third sizing double-line horizontal roll stand from the fifth to the seventh and the first sizing section are the same. And calculating the distance between the two ends of the two roll shaft sleeves in the fifth pass. In FIG. 8, the 1 st sleeve 6-5-3 is H wide₅Taking the width of a first roll collar of 24mm and 6-5-4C₅Taking the diameter as 10mm, and calculating according to the parameters to obtain theta₅=324°，R₅=7.1 mm. 3 rd and 4 th roller widths B of rollers 6-5-6 and 6-5-7₅=2(R₅+C₅) =34.2mm due to B_j1=B_j5=157.49mm, 1 st spacer 6-5-5 th wide h₅=B_j1-B₅=123.29 mm. Due to the same unit, the distance B between two ends of two 1 st shaft sleeves 6-5-3_k5As in example 4, the 1 st sleeve 6-5-1H wide₅=（B_k5-2B₅-h₅）/2=31.19mm。

In FIG. 9, 8-1 is the first diameter segment vertical roll axis, the diameter d of which_oA vertical roll with a diameter of 25mm and a first diameter section of 8-2, and the bottom diameter D of the vertical roll_kTaking 80mm, Δ S as the roll gap between two vertical rolls 8-2, taking 2mm, and taking the radius of the roll pass of the round tube blank as R_T=6.35mm, 8-3 and 8-4 being the 1 st and 2 nd tube billet cross sections, S, respectively_jThe center distance of the sections of the No. 1 and No. 2 tube blanks is 8-3, 8-4, S_j=B_j1. Diameter D of vertical roll_n=D_k+2R_T- [ S =90.7mm ], it is obviously smaller than B_j1And =157.49mm, so the offset arrangement of the vertical roller bases of the first diameter section is feasible.

In this example, the rounding and squaring are performed by using two asymmetric correction heads having four rolls, as shown in fig. 10 and 11. The roll pass can be placed at any angle, and for convenience of description, the roll pass is placed in the horizontal direction. The first hole pattern of the forming block is shown in fig. 12, the second hole pattern of the forming block is the final product channel, and the second hole pattern of the forming block is shown in fig. 13. In this example, the length of the side of the finished square tube is A_T10mm, a wall thickness t of 0.5mm, a square first pass central corner radius r₁Taking the corner radius r of the finished square tube_TRadius r of corner of finished square tube_TTaken as 1.35t +0.2=0.88mm, r₁=r_T=0.88mm, diameter d of roll shaft of asymmetric correction head_ojPhi 25mm, take A₁=A_T-0.76=9.24mm, square first pass roll pass radius of arc R_AGet A_T1.5 times of (A), R_A=1.5A_T=1.5 × 10mm =15mm, the reduction coefficient μ is 1.01, and the central angle α =57.3(μ a) corresponding to the arc of the square roll pass is taken_T-2r₁+3.14*r₁/2)/R_A=37.13 °, pass width a₁=2（（R_A-r₁）sin(α/2）+r₁cos(α/2)+R_A(1-cos (α/2))) =12.21mm, roll base diameter D_kjTaking the diameter D of a roller of 130mm_j=D_kj+2R_A(1-cos (α/2)) =131.56mm, distance n = (a) between roll shaft center E of side roll 3-9 and center O of 1 st tube blank₁+D_kj) 2=71.11mm, and the distance k = n + D from the edge C of the side roller 3-9 to the center O of the 1 st tube blank_jThe thickness of the tube blank is/2 =136.89mm, the distance from the edge F of the 3-1 of the vertical moving plate to the center O of the 1 st tube blank is 130mm, the outer radius Rp of the 3-3 of the rotating disc with the worm wheel is 130mm, and the inner radius r_pThe distance m from the edge G of the back plate 3-4 in the minor axis direction to the center O of the 1 st tube blank is 150mm and is smaller than the distance B from the center O of the 1 st tube blank to the edge H of the 2 nd tube blank 3-11_m=B_j1-a₁2=157.49-12.21/2=151.39mm, it can be seen that two asymmetric correction heads in a misaligned arrangement do not affect each other.

In FIGS. 16 to 18, 9-15 is a saw blade, R_jRadius of the saw blade, where R_jTaking 135mm as chuck of saw blade 9-16 as_jIs the chuck radius, r_jThe diameter was taken to be 40 mm. The distance between the center lines of the 1 st and the 2 nd tube blanks 9-19 and 9-20 is B_j1，C_jTaking C as the distance from the top end of the 1 st or 2 nd tube blank to the top surface of the module of the 1 st or 2 nd clamp_j5mm, and the central point of the saw blade 9-15 is O_jThe central point of the No. 1 tube blank 9-19 is E_jOver center point O_jPerpendicular to (A) is OD, through E_jThe intersection point of the horizontal line and the vertical line OD of the point is B_jΔ in triangle_jE_jB_jIn, E_jB_j=(A_T+B_j1)/2，a=Sin^-1（E_jB_j/R_j）=38.34°_，O_jB_j=R_jcosa =105.89mm, lowest point F of chuck 9-16_jPoint to the highest point A of the 1 st or 2 nd clamp_jA distance of_jF_JAs can be seen from fig. 18,

A_jF_j=O_jB_j-A_jB_j-r_j=R_Jcosa-A_T-C_j-r_j=50.89mm

A_jF_jthe value is reasonable between 10mm and 70 mm.

Claims

1. The utility model provides a two-wire metal square rectangular pipe shaping welding unit, includes as this unit group transmission system's first main motor (62), first main speed reducer (63), first distribution gear box (64) and first universal joint (65) to and unload work or material rest (70), its characterized in that: the double-wire metal square rectangular tube forming welding machine set is sequentially provided with a double-wire uncoiler (61), a first forming section (66), a first welding section (67), a first diameter section (68), a double-tube flying cutting device (69) and a double-wire unloading frame (70); the first molding section (66) is sequentially provided with seven double-line horizontal roller bases with the same structure, the first double-line horizontal roller base (66-1) is provided with a 1 st lower roller (6-1-6), a 2 nd lower roller (6-1-7), a spacer bush (6-1-5) and two shaft sleeves (6-1-3) positioned on the left side and the right side, and the width B of the roller of the 1 st lower roller (6-1-6) and the 2 nd lower roller (6-1-7)_i=2（R_iSin（θ_i/2）+C_i) The distance B between the two far ends of the two shaft sleeves (6-1-3)_Ki=2（B_i+H_i）+h_iThe distance B between the central lines of the two metal tube blanks_ji=B_i+h_iWherein i is the number of rolling passes of the forming section, i is 1-7, and theta_iIs the i-th deformation angle, R_iIs the i-th bend radius, C_iIs the ith roll ring width, H_iIs the ith shaft sleeve width h_iThe width of the ith channel spacer bush is wide; two No. 1 welding rollers (67-1-1) and two No. 2 welding rollers (67-1-2) which are arranged in a staggered way are arranged in the first welding section (67); the first diameter section (68) is internally provided with three sizing double-line horizontal roller bases (68-1) which are arranged in sequence and have the same structure, two groups of the 1 st vertical roller (68-2-1) and the 2 nd vertical roller (68-2-2) which are arranged alternately with the first diameter section, the 1 st vertical roller (68-2-1) and the 2 nd vertical roller (68-2-2) of each group are arranged in a staggered manner, and the three sizing double-line horizontal roller bases (68-1) arranged in the first diameter section (68), the seventh double-line horizontal roller base (66-7) arranged in the first molding section (66) and the first double-line horizontal roller base (66-7) are arranged in the first molding section (66)The parameters of size and dimension are the same; the tail section of the first diameter section (68) is provided with two asymmetric correction heads (68-6) which are arranged in a staggered mode and have the same structure, the double-pipe flight cutting device (69) comprises a pipe cutting rack (69-1) and a pipe cutting trolley (69-2), and the piston rod of the first air cylinder (69-1-3) drives the pipe cutting trolley (69-2) to move backwards in a resetting mode on the first guide rail (69-1-2).

2. The double-wire metal square rectangular pipe forming and welding unit according to claim 1, wherein: the first double-line horizontal roller base (66-1) comprises a rack (6-1-2), a first roller shaft (6-1-15), a second roller shaft (6-1-1), a shaft sleeve (6-1-3), a spacer bush (6-1-5), a bearing block (6-1-10), a screw (6-1-11), a first upper roller (6-1-8), a first lower roller (6-1-6), a second upper roller (6-1-9) and a second lower roller (6-1-7), wherein the first upper roller (6-1-8) and the second upper roller (6-1-9) are fixedly arranged in the middle of the rack (6-1-2) through the first roller shaft (6-1-15) and the two bearing blocks (6-1-10), the 1 st lower roller (6-1-6) and the 2 nd lower roller (6-1-7) are fixedly arranged at the lower part of the machine frame (6-1-2) through a 2 nd roller shaft (6-1-1) and two bearing seats (6-1-10), a spacer bush (6-1-5) is arranged between the 1 st lower roller (6-1-6) and the 2 nd lower roller (6-1-7), shaft sleeves (6-1-3) with the same width are respectively arranged between the 1 st lower roller (6-1-6) and the 2 nd lower roller (6-1-7) and adjacent bearing seats (6-1-10), the 1 st upper roller (6-1-8) and the 1 st lower roller (6-1-6) are matched in pairs, the 2 nd upper roller (6-1-9) and the 2 nd lower roller (6-1-7) are connected in pairs, two pressing screws (6-1-11) are respectively hinged with two bearing seats (6-1-10) arranged on the 1 st roller shaft (6-1-15).

3. The double-wire metal square rectangular pipe forming and welding unit according to claim 1, wherein: the vertical moving plate (3-1) of the asymmetric correction head (68-6) is in limit sliding connection with the four 1 st guide rail blocks (3-1-2) at the left side and the right side, the 1 st handle (3-1-1) drives the vertical moving plate (3-1) to move up and down, and the horizontal moving plate (3-2) is in limit sliding connection with the upper and the lower four 2 nd guide rail blocks (3-2-2)The horizontal moving plate (3-2) is driven to move left and right by the 2 nd handle (3-2-1), the turntable (3-3) with a worm wheel rotates 360 degrees by the worm (3-3-2) and the 3 rd handle (3-3-1), the roller frame (3-5) is connected with the turntable (3-3) with the worm wheel, the roller frame (3-5) is provided with a guide groove (3-5-1), a roller bearing seat (3-5-2) is movably arranged in the guide groove (3-5-1), the end part of the roller frame (3-5) is fixedly provided with a cross beam (3-5-3), an adjusting screw (3-5-4) is arranged between the cross beam (3-5-3) and the roller bearing seat (3-5-2), the roller bearing seat (3-5-2) is driven to move in the guide groove (3-5-1) through an adjusting screw (3-5-4), the rotary table (3-3) with a worm wheel is in axial sliding connection with the horizontal moving plate (3-2) through the cylinder (3-3-3) with the flange plate, the horizontal moving plate (3-2) is in horizontal sliding connection with the vertical moving plate (3-1) through the limit of the 2 nd guide rail block (3-2-2) and the 2 nd handle (3-2-1), and the vertical moving plate (3-1) is in vertical sliding connection with the back plate (3-4) through the limit of the 1 st guide rail block (3-1-2) and the 1 st handle (3-1-1); the rollers are arranged by four rollers, and the positions of the side rollers (3-9) and the lower rollers (3-10) are independently adjusted by corresponding adjusting screws (3-5-4); the horizontal directions of the vertical moving plate (3-1), the horizontal moving plate (3-2) and the back plate (3-4) are designed asymmetrically to the central line of the 2 nd production line (72), and the distance n = R from the roll shaft center E of the side roll (3-9) to the center O of the 1 st tube blank_T+D_KJ/2, the distance k = n + D from the edge C of the side roller (3-9) to the center O of the 1 st tube blank_jThe distance from the edge F of the vertical moving plate (3-1) to the center O of the 1 st tube blank and the outer radius R of the rotary table (3-3) with a worm wheel_PThe k value and the m value are respectively taken as being less than the distance m from the edge G of the back plate (3-4) to the center O of the 1 st tube blank, and the k value and the m value are less than the distance Bm = B from the center O of the 1 st tube blank to the edge H of the 2 nd tube blank (3-11)_j1-a₁/2。

4. The double-wire metal square rectangular pipe forming and welding unit according to claim 1, wherein: a pipe cutting rack (69-1) in the double-pipe flight cutting device (69) consists of a rack box body (69-1-1), a first guide rail (69-1-2) and a first cylinder (69-1-3), the first cylinder (69-1-3) fixed on the rack box body (69-1-1) is fixedly connected with a pipe cutting trolley (69-2) through a piston rod, and the bottom of the pipe cutting trolley (69-2) is in sliding connection with the two first guide rails (69-1-2).

5. The double-wire metal square rectangular pipe forming and welding unit according to claim 1, wherein: the pipe cutting trolley (69-2) in the double-pipe flying cutting device (69) comprises a double-pipe flying saw cutting machine (69-2-1) and a duplex clamp (69-2-2); the double-pipe flying saw sawing machine (69-2-1) comprises a saw blade (9-15) and a chuck (9-16) of the saw blade, and the lowest point F of the chuck (9-16)_jTo the highest point A of the duplex fixture (69-2-2)_jThe reasonable distance is 10-70 mm; the duplex fixture (69-2-2) comprises a 1 st fixture and a 2 nd fixture, wherein the 1 st fixture is provided with a 1 st left module (9-4), a 1 st right module (9-5), a 1 st left support (9-2), a 1 st right support (9-3) and a 1 st connecting piece (9-8), the 1 st left module (9-4) and the 1 st right module (9-5) are respectively in supporting connection with the 1 st left support (9-2) and the 1 st right support (9-3) through screws, the 2 nd fixture is provided with a 2 nd left module (9-7), a 2 nd right module (9-10), a 2 nd left support (9-6), a 2 nd right support (9-11) and a 2 nd connecting piece (9-9), the 2 nd left module (9-7) and the 2 nd right module (9-10) are respectively in contact with the 2 nd left support (9-6) through screws, The 2 nd right support (9-11) is in supporting connection, the 1 st right support (9-3) and the 2 nd right support (9-11) are fixed on a bottom plate (9-18) of the pipe cutting trolley (69-2), one end of a second guide rail (9-12) is fixed on a guide rail fixing seat (9-1), the 1 st left support (9-2) and the 2 nd left support (9-6) are in sliding connection with the second guide rail (9-12), the 1 st left support (9-2) is fixedly connected with a second piston rod (9-13) through a 1 st connecting piece (9-8), and the 2 nd left support (9-6) is fixedly connected with the second piston rod (9-13) through a 2 nd connecting piece (9-9).