CN211990368U - Coarse forming assembly for round pipe forming - Google Patents

Abstract

The utility model provides a be used for fashioned thick shaping subassembly of pipe belongs to pipe production facility technical field. It includes the lower roll module, the lower roll module on be equipped with the lower roll body that the axis is on a parallel with the bottom surface, be equipped with the side roller module respectively in lower roll module both sides, be equipped with the side roller body in every side roller module, the axis of side roller body incline to the working face of bottom surface and side roller body top towards one side of lower roll module, every side roller module top be equipped with can with side roller body complex go up the roller module. The side roll body is arranged in an inclined mode, the annular arc-shaped concave forming groove formed in the roll surface of the side roll body can be matched with the arc-shaped outer chamfer angle formed in the upper roll body, the sheet can be subjected to rough forming radian at the edge of the sheet through one process, production equipment required by radian is greatly reduced in rough machining of the edge of the sheet, and therefore the purpose of reducing production cost is achieved.

Description

Coarse forming assembly for round pipe forming

Technical Field

The utility model belongs to the technical field of the pipe production facility, a thick shaping subassembly for pipe shaping is related to.

Background

The circular tube is a steel material with two open ends and a hollow concentric cross section, and the length of the steel material is larger than that of the periphery. The pipe can be used for pipelines, thermal equipment, mechanical industry, petroleum geological drilling, containers, chemical industry and special purposes, the pipe can be divided into seamless pipe and welding pipe according to production method, the production line of welding pipe forms the pipe after carrying out continuous extrusion deformation to panel generally through a plurality of side rollers at present, but the effect of panel edge rough machining radian among the prior art is not good, so often need through multichannel side roller extrusion process just can make panel edge primary forming, consequently, lead to the cost of production facility such as side roller too high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem, provide a thick shaping subassembly for pipe shaping.

In order to achieve the above purpose, the utility model adopts the following technical proposal:

a rough forming component for forming a circular tube comprises a lower roll module, wherein a lower roll body with the central axis parallel to the bottom surface is arranged on the lower roll module, side roller modules are respectively arranged at two sides of the lower roller module, each side roller module is provided with a side roller body, the central axis of each side roller body is inclined to the bottom surface, the working surface above each side roller body faces one side of the lower roller module, an upper roller module capable of being matched with each side roller body is arranged above each side roller module, the upper roll module is provided with an upper roll body, the central axis of the upper roll body is parallel to the bottom surface, the cross section of the roll surface of the lower roll body is arc-shaped and convex, the cross section of the side roll body is isosceles trapezoid, and the roll surface is provided with an annular arc-shaped sunken forming groove, the outer diameter of the roll surface of the upper roll body is gradually increased from the inner end to the outer end, and an arc-shaped outer chamfer which can be used for forming the steel pipe arc surface by matching with the arc-shaped sunken forming groove is arranged between the middle part of the roller surface and the outer end of the upper roller body.

In foretell thick shaping subassembly for pipe shaping, lower roll module include lower roll body seat, lower roll body link to each other with lower roll body seat through lower roll body axle, lower roll body cover establish on lower roll body axle, be equipped with two first bearings down between roll body and lower roll body axle, be equipped with the first ring baffle of cover establishing on lower roll body axle in every first bearing outside, first ring baffle pass through a plurality of bolt fastening under on the roll body and the inner support by on the first bearing outer loop, first ring baffle and lower roll body between leave the clearance, be equipped with the sealing washer between first ring baffle and lower roll body axle.

In the rough forming assembly for circular tube forming, the lower roller shaft is provided with a first oil supply channel with a cross section in a Chinese character 'shan' shape, two ends of the first oil supply channel are respectively provided with an oil injection plug, and the middle part of the first oil supply channel is communicated with the first bearing installation cavity.

In foretell thick shaping subassembly for pipe shaping, the side roller module include that the cross section is personally submitted the first side roll body axle bed of L shape and the cross section is personally submitted the second side roll body axle bed of I font, the second side roll body axle bed fixed through a plurality of bolts and first side roll body axle bed, the side roll body cover establish on the side roll body axle, side roll body axle one end set up at second side roll body axle bed, the other end sets up on first side roll body axle bed.

In foretell thick shaping subassembly that is used for the pipe shaping, side roller body and side roller body between be equipped with two second bearings, the diameter that is located the second bearing of side roller body upper end is less than the diameter of the second bearing of side roller body lower extreme, side roller body on still be equipped with two second annular baffles that are located side roller body both ends respectively, second annular baffle pass through a plurality of bolt fastening on the side roller body, and the inner supports and leans on the second bearing outer loop, be located the second annular baffle of side roller body lower extreme and inlay the outer end and rather than the terminal surface parallel and level on establishing under the side roller body terminal surface.

In foretell thick shaping subassembly that is used for the pipe shaping, second annular baffle and side roller body between leave the clearance, be equipped with the sealing washer between second annular baffle and side roller body, side roller body upper end be equipped with the second oil supply channel that is the L shape, second oil supply channel one end be equipped with the oiling end cap, the other end and second bearing installation cavity intercommunication.

In foretell thick shaping subassembly for pipe shaping, last roller module include the roll body axle bed, wear to be equipped with transversely to set up the last roller body axle that is the T font on last roll body axle bed, last roller body cover establish on the end disc of last roller body axle the inner and through a plurality of bolt fixings that distribute along the circumferencial direction.

In foretell thick shaping subassembly that is used for the pipe shaping, last roll body axle bed with go up and be equipped with the third bearing that is located both ends respectively between the roll body axle bed, the third bearing diameter of outer end is less than the third bearing diameter of inner, go up the cover and be equipped with the fixation nut rather than the spiro union on the roll body axle outer end, fixation nut inner supports through the third bearing inner ring of outer apical ring and outer end and leans on, the third bearing of end dish and inner between be equipped with interior apical ring, interior apical ring one end support and lean on the end dish, the other end supports and leans on the inner third bearing inner ring.

In foretell thick shaping subassembly for pipe shaping, last roller body axle seat on be equipped with the third oil supply channel, third oil supply channel inner communicate with lubricated chamber, be equipped with the oiling end cap on the outer end.

In the rough forming component for forming the circular tube, arc chamfers are respectively arranged between two sides of the roller surface of the lower roller body and the end surface of the lower roller body; arc chamfers are respectively arranged between the two sides of the arc-shaped sunken forming groove and the end surface of the lower roll body; and an arc-shaped chamfer is arranged between the inner end of the roller surface of the upper roller body and the end surface of the upper roller body.

Compared with the prior art, the utility model has the advantages of:

1. the side roll body is arranged in an inclined mode, the annular arc-shaped concave forming groove formed in the roll surface of the side roll body can be matched with the arc-shaped outer chamfer angle formed in the upper roll body, the sheet can be subjected to rough forming radian at the edge of the sheet through one process, production equipment required by radian is greatly reduced in rough machining of the edge of the sheet, and therefore the purpose of reducing production cost is achieved.

2. The middle part of the plate can be protruded upwards by the aid of the arc-shaped protrusion on the roller surface of the lower roller body 4, and upward radians are formed at the edge of the plate close to the middle part of the plate by the aid of the upper roller body 7 and the side roller bodies 3 in a matched mode, so that the effect of coarse forming of the plate can be further improved.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic view of the overall structure provided by the present invention.

In the figure, the lower roll module 1, the side roll module 2, the side roll body 3, the lower roll body 4, the central axis 5, the upper roll module 6, the upper roll body 7, the arc-shaped concave forming groove 8, the arc-shaped outer chamfer 9, the lower roll body seat 10, the lower roll body 11, the first bearing 12, the first annular baffle 13, the first oil supply channel 14, the first bearing installation cavity 15, the first side roll body shaft seat 16, the second side roll body shaft seat 17, the side roll body shaft 18, the second bearing 19, the second annular baffle 20, the second oil supply channel 21, the second bearing installation cavity 22, the upper roll body shaft seat 23, the upper roll body shaft 24, the end disc 25, the third bearing 26, the fixing nut 27, the outer top ring 28, the inner top ring 29, the third oil supply channel 30, the lubrication cavity 31, the inner seal ring 32 and the outer seal ring 33.

Detailed Description

As shown in figure 1, a rough forming assembly for circular tube forming comprises a lower roll module 1, wherein the lower roll module 1 is provided with a lower roll body 4 with a central axis parallel to the bottom surface, two sides of the lower roll module 1 are respectively provided with a side roll module 2, each side roll module 2 is provided with a side roll body 3, the central axis 5 of each side roll body 3 is inclined to the bottom surface, the working surface above the side roll body 3 faces one side of the lower roll module 1, an upper roll module 6 capable of being matched with the side roll bodies 3 is arranged above each side roll module 2, the upper roll module 6 is provided with an upper roll body 7, the central axis of the upper roll body 7 is parallel to the bottom surface, the cross section of the roll surface of the lower roll body 4 is arc-shaped and convex, the cross section of each side roll body 3 is isosceles trapezoid-shaped, an annular arc-shaped concave forming groove 8 is formed in the roll surface, the outer diameter of the roll surface of the upper roll body 7 is gradually, and an arc-shaped outer chamfer 9 which can be used for forming the arc surface of the steel pipe by matching with the arc-shaped sunken forming groove 8 is arranged between the middle part of the roller surface and the outer end of the upper roller body 7.

In this embodiment, 3 slopes of side roll body set up, and the sunken shaping groove 8 that is annular arc that sets up on 3 roll surfaces of side roll body can cooperate with outer chamfer 9 of the arc on the last roll body 7, makes panel process one process can make panel edge rough forming radian, greatly reduced panel edge rough machining go out the required production facility of radian to reach reduction in production cost's purpose.

The middle part of the plate can be protruded upwards by the aid of the arc-shaped protrusion on the roller surface of the lower roller body 4, and upward radians are formed at the edge of the plate close to the middle part of the plate by the aid of the upper roller body 7 and the side roller bodies 3 in a matched mode, so that the effect of coarse forming of the plate can be further improved.

Preferably, the lower roller body 4 can be externally connected with a driving mechanism, and the driving mechanism can drive the lower roller body to rotate so as to drive the plate to advance.

It will be appreciated by those skilled in the art that the drive mechanism may be a rotary cylinder or an electric motor.

The lower roll module 1 comprises a lower roll body seat 10, the lower roll body 4 is connected with the lower roll body seat 10 through a lower roll body shaft 11, the lower roll body 4 is sleeved on the lower roll body shaft 11, two first bearings 12 are arranged between the lower roll body 4 and the lower roll body shaft 11, a first annular baffle plate 13 sleeved on the lower roll body shaft 11 is arranged on the outer side of each first bearing 12, the first annular baffle plate 13 is fixed on the lower roll body 4 through a plurality of bolts, the inner end of the first annular baffle plate abuts against the outer ring of the first bearing 12, a gap is reserved between the first annular baffle plate 13 and the lower roll body shaft 11, and a sealing ring is arranged between the first annular baffle plate 13 and the lower roll body shaft 11.

In this embodiment, as shown in fig. 1, the lower roller body 4 is connected to the lower roller body base 10 through the lower roller body shaft 11, and the lower roller body 4 can rotate around the lower roller body shaft 11, so that the surface of the plate can be prevented from being damaged due to friction with the lower roller body 4 when the plate moves.

The seal ring provided between the first ring fence 13 and the lower roller shaft 11 prevents the lubricating oil from oozing out.

The lower roller shaft 11 is provided with a first oil supply channel 14 with a cross section in a shape of Chinese character 'shan', both ends of the first oil supply channel 14 are provided with oil injection plugs, the middle part of the first oil supply channel 14 is communicated with a first bearing installation cavity 15, and both ends of the lower roller shaft 11 are fixed on the lower roller seat 10 through shaft seats.

In this embodiment, as shown in fig. 1, the first oil supply channel 14 with the cross-section in the shape of the Chinese character 'shan' can transport lubricating oil into the first bearing installation cavity 15 to lubricate the first bearing 12, the oil filling plug is detachably disposed, and the detachable plug can conveniently perform oil filling and seal the first oil supply channel 14.

The side roller module 2 comprises a first side roller body shaft seat 16 with an L-shaped cross section and a second side roller body shaft seat 17 with an I-shaped cross section, the second side roller body shaft seat 17 is fixed with the first side roller body shaft seat 16 through a plurality of bolts, the side roller body 3 is sleeved on the side roller body shaft 18, one end of the side roller body shaft 18 is arranged on the second side roller body shaft seat 17, and the other end of the side roller body shaft is arranged on the first side roller body shaft seat 16.

In this embodiment, combine fig. 1 to show, the mount pad of side roll body adopts the first side roll body axle bed 16 that is L shape and the transversal second side roll body axle bed 17 of personally submitting the I font to fix through the bolt, can make things convenient for the mount pad casting shaping, and when first side roll body axle bed 16 or second side roll body axle bed 17 damaged, need not to carry out the whole change to the mount pad, practices thrift the cost.

The side roller body is connected with the mounting seat through the side roller body shaft 18, so that the side roller body can rotate around the side roller body shaft 18, and the plate surface damage caused by friction between the side roller body and the plate during movement can be prevented.

Be equipped with two second bearings 19 between side roll body axle 18 and the side roll body 3, the diameter that is located second bearing 19 of side roll body axle 18 upper end is less than the diameter of the second bearing 19 of side roll body axle 18 lower extreme, side roll body axle 18 on still be equipped with two second ring baffle 20 that are located side roll body 3 both ends respectively, second ring baffle 20 fix on side roll body 3 through a plurality of bolts, and the inner supports and leans on the 19 outer loop of second bearing, be located the second ring baffle 20 of side roll body 3 lower extreme and inlay the outer end and rather than the terminal surface parallel and level on establishing side roll body 3 lower extreme terminal surface.

In this embodiment, as shown in fig. 1, the second ring-shaped baffle 20 can fix the second bearing 19 and the side roller shaft 18, so as to prevent the loose of the second ring-shaped baffle during operation from causing the poor rough forming effect of the edge of the product.

A gap is reserved between the second annular baffle plate 20 and the side roller body shaft 18, a sealing ring is arranged between the second annular baffle plate 20 and the side roller body shaft 18, an L-shaped second oil supply channel 21 is arranged at the upper end of the side roller body shaft 18, one end of the second oil supply channel 21 is provided with an oil injection plug, and the other end of the second oil supply channel is communicated with the second bearing installation cavity 22.

In this embodiment, combine fig. 1 to show, the sealing washer can prevent that lubricating oil from oozing, thereby second supply channel 21 can lubricate the bearing with lubricating oil injection to second bearing installation cavity 22 in, the setting can be dismantled to the oiling end cap, and the detachable end cap can conveniently refuel and seal second supply channel 21.

The upper roll module 6 comprises an upper roll body shaft seat 23, an upper roll body shaft 24 transversely arranged in a T shape is arranged on the upper roll body shaft seat 23 in a penetrating mode, and the upper roll body 7 is sleeved on an end disc 25 at the inner end of the upper roll body shaft 24 and fixed through a plurality of bolts distributed in the circumferential direction.

In this embodiment, as shown in fig. 1, the upper roller body inner end is fixed on the end disc 25 through a bolt, so that the upper roller body can be conveniently mounted on the end disc, and can be conveniently replaced when the upper roller body is damaged, without being replaced together with the upper roller body shaft 24, so that the maintenance cost can be reduced.

Go up and be equipped with the third bearing 26 that is located both ends respectively between roll body axle bed 23 and the last roll body axle 24, the third bearing 26 diameter of outer end is less than the third bearing 26 diameter of inner, goes up the cover and is equipped with the fixation nut 27 rather than the spiro union on the 24 outer ends of roll body axle, fixation nut 27 inner supports through outer apical ring 28 and the third bearing 26 inner ring of outer end and leans on, end disc 25 and the third bearing 26 of inner between be equipped with interior apical ring 29, interior apical ring 29 one end support and lean on end disc 25, the other end supports and leans on the third bearing 26 inner ring of inner.

An outer sealing ring 33 is tightly connected on the outer top ring 28, the inner end of the outer sealing ring 33 is abutted against the outer ring of the outer end of the third bearing 26, an inner sealing ring 32 is tightly connected on the inner top ring 29, and the inner sealing ring 32 is abutted against the outer ring of the inner end of the third bearing 26.

In this embodiment, as shown in fig. 1, the inner end of the fixing nut 27 abuts against the inner ring of the third bearing 26 at the outer end through the outer top ring 28, so that the upper roller shaft holder 23 and the third bearing 26 at the outer end can be fixed, the loosening of the inner end during operation is prevented, the rough forming effect of the edge of the product is prevented from being deteriorated, and the inner top ring 29 can fix the upper roller shaft holder 23 and the third bearing 26 at the inner end.

The outer and inner seal rings 33 and 32 prevent the lubricant oil at the third bearings 26 located at both ends of the upper roller shaft 24 from overflowing.

The upper roller body shaft seat 23 is provided with a third oil supply channel 30, the inner end of the third oil supply channel 30 is communicated with the lubricating cavity 31, and the outer end is provided with an oil injection plug.

In this embodiment, as shown in fig. 1, the third oil supply channel 30 can inject the lubricating oil into the lubricating cavity 31 so as to lubricate the bearing, the oil filling plug is detachably disposed, and the oil filling plug can conveniently fill the oil and seal the third oil supply channel 30.

Arc chamfers are respectively arranged between the two sides of the roller surface of the lower roller body 4 and the end surface of the lower roller body 4; arc chamfers are respectively arranged between the two sides of the arc-shaped sunken forming groove 8 and the end surface of the lower roller body 4; an arc-shaped chamfer is arranged between the inner end of the roller surface of the upper roller body 7 and the end surface of the upper roller body 7.

In this embodiment, as shown in fig. 1, the arc chamfers can prevent the plate from being scratched when the plate moves, so that the surface quality of the plate is poor.

The utility model discloses a theory of operation is: move panel to the side roll body and go up in the clearance between the roll body, the slope of the side roll body 3 sets up, it can cooperate with the outer chamfer 9 of arc on the roll body 7 to be annular arc sunken shaping groove 8 that is offered on the roll surface of the side roll body 3, make panel process one process can make panel edge coarse forming radian, greatly reduced panel edge coarse processing produce the required production facility of radian, thereby reach reduction in production cost's purpose, it can make panel middle part epirelief to be curved protruding form on the roll surface of the roll body 4 down, roll body 7 and the side roll body 3 are close to the shaping of middle part position at the panel edge and are gone out ascending radian in the deuterogamy, can further improve panel coarse forming's effect.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although terms such as the lower roll module 1, the side roll module 2, the side roll body 3, the lower roll body 4, the central axis 5, the upper roll module 6, the upper roll body 7, the arc-shaped concave forming groove 8, the arc-shaped outer chamfer 9, the lower roll body seat 10, the lower roll body shaft 11, the first bearing 12, the first annular baffle 13, the first oil supply channel 14, the first bearing mounting cavity 15, the first side roll body shaft seat 16, the second side roll body shaft seat 17, the side roll body shaft 18, the second bearing 19, the second annular baffle 20, the second oil supply channel 21, the second bearing mounting cavity 22, the upper roll body shaft seat 23, the upper roll body shaft 24, the end disc 25, the third bearing 26, the fixing nut 27, the outer top ring 28, the inner top ring 29, the third oil supply channel 30, the lubrication cavity 31, the inner seal ring 32, the outer seal ring 33, and the like are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention and should not be interpreted as imposing any additional limitations that are contrary to the spirit of the present invention.

Claims (10)

1. A rough forming assembly for circular tube forming is characterized by comprising a lower roller module (1), wherein a lower roller body (4) with a central axis parallel to a bottom surface is arranged on the lower roller module (1), side roller modules (2) are respectively arranged on two sides of the lower roller module (1), a side roller body (3) is arranged on each side roller module (2), the central axis (5) of each side roller body (3) is inclined to the bottom surface, a working surface above each side roller body (3) faces one side of the lower roller module (1), an upper roller module (6) capable of being matched with each side roller body (3) is arranged above each side roller module (2), an upper roller body (7) is arranged on each upper roller module (6), the central axis of each upper roller body (7) is parallel to the bottom surface, the cross section of the roller surface of the lower roller body (4) is arc-shaped and convex, the cross section of each side roller body (3) is in an isosceles trapezoid shape, and set up on its roll surface and be annular arc sunken shaping groove (8), the external diameter of last roll body (7) roll surface increase gradually by inner to outer end, and be equipped with between roll surface middle part and last roll body (7) outer end and be used for with arc sunken shaping groove (8) cooperation shaping steel pipe cambered surface arc outer chamfer (9).

2. Rough forming assembly for round tube forming according to claim 1, the lower roll module (1) comprises a lower roll body seat (10), the lower roll body (4) is connected with the lower roll body seat (10) through a lower roll body shaft (11), the lower roll body (4) is sleeved on the lower roll body shaft (11), two first bearings (12) are arranged between the lower roller body (4) and the lower roller body shaft (11), a first annular baffle plate (13) sleeved on the lower roller shaft (11) is arranged at the outer side of each first bearing (12), the first annular baffle (13) is fixed on the lower roller body (4) through a plurality of bolts, the inner end of the first annular baffle is propped against the outer ring of the first bearing (12), a gap is reserved between the first annular baffle plate (13) and the lower roller shaft (11), a sealing ring is arranged between the first annular baffle plate (13) and the lower roller shaft (11).

3. The rough forming assembly for round tube forming as claimed in claim 2, wherein the lower roller shaft (11) is provided with a first oil supply channel (14) with a cross section in a chevron shape, both ends of the first oil supply channel (14) are provided with oil injection plugs, and the middle part of the first oil supply channel (14) is communicated with the first bearing installation cavity (15).

4. The rough forming assembly for round pipe forming according to claim 1, wherein the side roller module (2) comprises a first side roller axle seat (16) with an L-shaped cross section and a second side roller axle seat (17) with an I-shaped cross section, the second side roller axle seat (17) is fixed with the first side roller axle seat (16) through a plurality of bolts, the side roller body (3) is sleeved on the side roller axle seat (18), one end of the side roller axle (18) is arranged on the second side roller axle seat (17), and the other end is arranged on the first side roller axle seat (16).

5. The rough forming assembly for round pipe forming according to claim 4, wherein two second bearings (19) are arranged between the side roller body (18) and the side roller body (3), the diameter of the second bearing (19) at the upper end of the side roller body (18) is smaller than that of the second bearing (19) at the lower end of the side roller body (18), two second annular baffles (20) respectively arranged at two ends of the side roller body (3) are further arranged on the side roller body (18), the second annular baffles (20) are fixed on the side roller body (3) through a plurality of bolts, the inner ends of the second annular baffles abut against the outer ring of the second bearing (19), and the second annular baffles (20) at the lower end of the side roller body (3) are embedded on the lower end face of the side roller body (3) and the outer ends of the second annular baffles are flush with the end face of the side roller body.

6. The rough forming assembly for round pipe forming as claimed in claim 5, wherein a gap is left between the second annular baffle plate (20) and the side roller shaft (18), a sealing ring is arranged between the second annular baffle plate (20) and the side roller shaft (18), the upper end of the side roller shaft (18) is provided with an L-shaped second oil supply channel (21), one end of the second oil supply channel (21) is provided with an oil filling plug, and the other end of the second oil supply channel is communicated with the second bearing mounting cavity (22).

7. The rough forming assembly for round pipe forming as claimed in claim 1, wherein the upper roller module (6) comprises an upper roller shaft seat (23), an upper roller shaft (24) transversely arranged in a T shape is arranged on the upper roller shaft seat (23) in a penetrating manner, and the upper roller body (7) is sleeved on an end disc (25) at the inner end of the upper roller shaft (24) and fixed by a plurality of bolts distributed in the circumferential direction.

8. The rough forming assembly for round tube forming as claimed in claim 7, wherein third bearings (26) respectively located at two ends are arranged between the upper roller body shaft seat (23) and the upper roller body shaft (24), the diameter of the third bearing (26) at the outer end is smaller than that of the third bearing (26) at the inner end, a fixing nut (27) screwed with the upper roller body shaft (24) is sleeved on the outer end of the upper roller body shaft (24), the inner end of the fixing nut (27) abuts against the inner ring of the third bearing (26) at the outer end through an outer top ring (28), an inner top ring (29) is arranged between the end disc (25) and the third bearing (26) at the inner end, one end of the inner top ring (29) abuts against the end disc (25), and the other end abuts against the inner ring of the third bearing (26) at the inner end.

9. The rough forming assembly for round tube forming as claimed in claim 7 or 8, wherein the upper roller axle seat (23) is provided with a third oil supply channel (30), the inner end of the third oil supply channel (30) is communicated with the lubricating cavity (31), and the outer end is provided with an oil filling plug.

10. The rough forming assembly for round tube forming according to any one of claims 1 to 8, wherein arc-shaped chamfers are respectively arranged between two sides of the roll surface of the lower roll body (4) and the end surface of the lower roll body (4); arc chamfers are respectively arranged between the two sides of the arc-shaped concave forming groove (8) and the end surface of the lower roller body (4); an arc chamfer is arranged between the inner end of the roller surface of the upper roller body (7) and the end surface of the upper roller body (7).

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