Rolling mechanism and skew rolling mill

Abstract

The application belongs to the technical field of rolling and discloses a rolling mechanism and a cross rolling mill. The rolling mechanism is used in the cross rolling mill and comprises a roller assembly, a top head and an auxiliary roller assembly. The roller assembly is provided with a deformation zone, an inlet and an outlet which are communicated with the deformation zone. The roller assembly is used for rolling the rolled piece which enters the deformation zone from the inlet and driving the rolled piece to move along a rolling line. The top head is arranged in the deformation zone and is used for perforating the rolled piece which passes through the deformation zone. The auxiliary roller assembly is arranged on one side of the roller assembly which is provided with the outlet. The auxiliary roller assembly is used for biting the rolled piece and driving the rolled piece to continue moving along the rolling line when the rolled piece moves from the outlet to outside the deformation zone. The rolling mechanism provided by the application bites the rolled piece through the auxiliary roller assembly, provides power for the continuous movement of the rolled piece, avoids the tail clamping condition, improves the production efficiency, and has a simple structure and greatly saves resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rolling technology, in particular to a rolling mechanism and a cross rolling mill. BACKGROUND

[0002] Seamless steel pipes are widely used in various industries as important raw materials. At present, three rollers are used for rolling in the hot rolling process of seamless steel pipes. The three-roller piercing rolling makes the position of the plug in the deformation zone more stable, and the geometric precision of the raw pipe obtained after piercing is higher than that obtained by two-roller rolling. This lays a foundation for improving the concentricity, wall thickness tolerance, surface quality and roundness of the product, and ultimately enables the production of finished products with small tolerances.

[0003] However, in specific applications, tail jamming problems often occur at the end of the plug during the rolling of thin-walled seamless steel pipes, which reduces the precision of the rolled pipes and prolongs the production cycle. The main reason for tail jamming is that when the rolling piece (also known as billet, pipe blank, bar, etc.) is about to end piercing, as the tail of the rolling piece is pierced by the plug, the transverse spread of the rolling piece decreases, the diameter expansion phenomenon weakens, the diameter of the tail end of the rolling piece shrinks, and the contact area between the roller and the rolling piece decreases, which weakens the force driving the axial movement of the rolling piece. When the internal expansion amount cannot offset the diameter shrinkage amount of the raw pipe tail, tail jamming occurs. SUMMARY

[0004] The first object of the present application is to provide a rolling mechanism that aims to solve the technical problem of tail jamming during the rolling of thin-walled seamless steel pipes.

[0005] To achieve the above-mentioned object, the present application provides a rolling mechanism for a cross rolling mill, comprising:

[0006] a roller assembly provided with a deformation zone, an inlet and an outlet communicating with the deformation zone, the roller assembly being used for rolling the rolling piece entering the deformation zone from the inlet and driving the rolling piece to move along the rolling line;

[0007] a plug provided in the deformation zone for piercing the rolling piece passing through the deformation zone;

[0008] an auxiliary roller assembly provided on the side of the roller assembly where the outlet is located, the auxiliary roller assembly being used for biting the rolling piece and driving the rolling piece to continue moving along the rolling line when the rolling piece moves from the outlet to outside the deformation zone.

[0009] The second object of the present application is to provide a cross rolling mill, comprising:

[0010] the above-mentioned rolling mechanism;

[0011] A first power mechanism for driving the auxiliary roller assembly to move;

[0012] A second power mechanism for driving the roller assembly to move;

[0013] A controller electrically connected with the first power mechanism and the second power mechanism respectively, for controlling the first power mechanism to drive the auxiliary roller assembly to move, and controlling the second power mechanism to drive the roller assembly to move, so that the linear velocity and direction of the part of the rolled piece and the auxiliary roller assembly in contact when the rolled piece is moved by the auxiliary roller assembly are the same as the linear velocity and direction of the part of the rolled piece and the roller assembly in contact when the rolled piece is moved by the roller assembly at the outlet.

[0014] The rolling mechanism and the cross rolling mill provided by the present application can prevent the tail clamping by setting the auxiliary roller assembly on the side of the roller assembly with the outlet, so as to bite the rolled piece and provide power for the rolled piece to continue moving along the rolling line when the rolled piece moves to the outside of the deformation zone through the outlet. Therefore, the rolling mechanism provided by the present application can avoid the tail clamping, improve the production efficiency, and has simple structure and greatly saves resources. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in the drawings without creative labor.

[0016] Figure 1 is a structural schematic view of one perspective of the rolling mechanism provided by the first embodiment of the present application;

[0017] Figure 2 is a structural schematic view of another perspective of the rolling mechanism provided by the first embodiment of the present application;

[0018] Figure 3 is a structural schematic view of another perspective of the rolling mechanism provided by the first embodiment of the present application;

[0019] Figure 4 is a right view of the auxiliary roller provided by the first embodiment of the present application;

[0020] Figure 5 is a right view of the roller provided by the first embodiment of the present application;

[0021] Figure 6 is a component diagram of the cross rolling mill provided by the embodiment one of the present application;

[0022] Figure 7 is a right view of the roll provided by the embodiment two of the present application.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 1000, cross rolling mill; 100, rolling mechanism; 10, roll assembly; 11, deformation zone; 12, inlet; 13, outlet; 14, roll; 141, first type of circular cone part; 142, second type of circular cone part; 143, roll throat; 144, third type of circular cone part; 15, guide plate; 20, top head; 30, auxiliary roll assembly; 31, auxiliary roll; 311, auxiliary type of circular cone part; 312, cylindrical part; 200, first power mechanism; 300, second power mechanism; 400, controller.

[0025] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work under the premise that the present application falls within the scope of protection.

[0027] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directionality indications also change accordingly.

[0028] It should also be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be a middle element.

[0029] In addition, the description related to "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0030] In order to better understand the embodiment of the present application, the following explains the special terms appearing in the present application:

[0031] Tail card: refers to the unstable stage of the tail of the rolled piece metal gradually leaving the deformation zone;

[0032] Rolling card: refers to the phenomenon that the rolled piece only rotates without advancing or neither rotates nor advances in the rolling process;

[0033] Deformation zone: the space formed by the rolling mechanism of the roll, the rolled piece is deformed in the space under the action of the roll;

[0034] Rolling line: refers to the running track of the center of the rolled piece in the rolling process, that is, the center line surrounded by all the rolls in the roll assembly;

[0035] Feed angle: refers to the included angle between the horizontal projection of the roll axis and the rolling line on the horizontal section passing through the rolling line;

[0036] Rolling angle: refers to the included angle between the vertical projection of the roll axis and the rolling line on the vertical section passing through the rolling line;

[0037] Roll surface cone angle: refers to the included angle between the generatrix of the circular truncated cone part and the rolling line on any section passing through the roll axis;

[0038] Roundness: refers to adjusting the roundness of the rolled piece in the rolling process, so as to make the roundness of the rolled piece better;

[0039] Inlet cone angle: refers to the included angle between the generatrix of the circular truncated cone part first contacting the blank and the rolling line on any section passing through the roll axis;

[0040] In the related art, during the rolling of thin-walled seamless steel pipe, due to the limitation of design, at the last stage of the rolling process, the roll and the plug cannot provide enough friction force for the rolled piece to continue to advance, so that the tail card occurs. In view of this, the present application provides a rolling mechanism to avoid the occurrence of tail card.

[0041] Embodiment one:

[0042] AsFigures 1 to 3 As shown in the drawings, the rolling mechanism 100 provided by the embodiment of the present application for the cross rolling mill 1000 comprises a roller assembly 10, a piercing head 20 and an auxiliary roller assembly 30; the roller assembly 10 is provided with a deformation zone 11, an inlet 12 and an outlet 13 which are communicated with the deformation zone 11, the roller assembly 10 is used for rolling the rolled piece (also can be called blank, pipe blank, bar, etc.) which enters the deformation zone 11 from the inlet 12 and driving the rolled piece to move along the rolling line; the piercing head 20 is arranged in the deformation zone 11 and is used for perforating the rolled piece which passes through the deformation zone 11; the auxiliary roller assembly 30 is arranged on the side of the roller assembly 10 which is provided with the outlet 13, and the auxiliary roller assembly 30 is used for biting the rolled piece and driving the rolled piece to continue moving along the rolling line when the rolled piece moves from the outlet 13 to the outside of the deformation zone 11.

[0043] In use, the rolled piece enters the deformation zone 11 from the inlet 12 for rolling and moves along the rolling line under the action of the roller assembly 10, wherein the piercing head 20 perforates the rolled piece to make the rolled piece be rolled into a tubular part; after the rolled piece moves out of the outlet 13, the auxiliary roller assembly 30 bites the rolled piece and makes the rolled piece continue to move along the rolling line.

[0044] By adopting the above technical scheme, the roller assembly 10 and the piercing head 20 are arranged to be used for rolling the rolled piece into a seamless steel pipe; the auxiliary roller assembly 30 is arranged on the side of the roller assembly 10 which is provided with the outlet 13 to be used for biting the rolled piece when the rolled piece moves to the outside of the deformation zone 11 and providing power for the continued movement of the rolled piece to prevent tail sticking caused by insufficient power provided by the roller assembly 10 after the rolled piece is separated from the piercing head 20. Therefore, the rolling mechanism 100 provided by the embodiment of the present application can avoid the occurrence of tail sticking, improve the production efficiency, and has simple structure and greatly saves resources.

[0045] As an implementation form, referring to Figures 1 to 3 As shown in the drawings, the auxiliary roller assembly 30 comprises at least two auxiliary rollers 31 which are uniformly distributed along the circumference of the rolling line. In the embodiment, the number of the auxiliary rollers 31 is four, and the four auxiliary rollers 31 are uniformly distributed along the circumference of the rolling line. Of course, in specific application, the number of the auxiliary rollers 31 can not be limited to four, and as an alternative implementation form, the number of the auxiliary rollers 31 can be two or three or five or the like.

[0046] As an implementation form, referring to Figure 2 and Figure 4As shown, the auxiliary roller 31 comprises an auxiliary quasi-circular table portion 311 and a cylindrical portion 312 coaxially arranged with the auxiliary quasi-circular table portion 311; the cylindrical portion 312 is arranged at the end of the auxiliary quasi-circular table portion 311 away from the outlet 13, the radial dimension of the auxiliary quasi-circular table portion 311 gradually increases along the direction away from the outlet 13, and the radial dimension of the end of the auxiliary quasi-circular table portion 311 away from the outlet 13 is equal to the radial dimension of the cylindrical portion 312. In specific applications, the bottom surface of the auxiliary quasi-circular table portion 311 facing the cylindrical portion 312 is coplanar with the bottom surface of the cylindrical portion 312 facing the auxiliary quasi-circular table portion 311. By arranging the auxiliary quasi-circular table portion 311 in the above manner, the entrance caliber of the area enclosed by all the auxiliary rollers 31 is large, and the caliber gradually decreases as the operation continues, which helps the auxiliary rollers 31 to bite the rolled piece; by arranging the cylindrical portion 312, it is helpful to perform the sizing treatment on the rolled piece. Moreover, the auxiliary roller 31 has a simple structure and is easy to produce and manufacture.

[0047] As an implementation manner, the vertical distance between the generatrix of the cylindrical portion 312 and the rolling line is equal to half of the radial dimension of the rolled piece. That is, the auxiliary roller 31 is tangent to the outer wall of the rolled piece, which on the one hand plays a role in sizing, and on the other hand improves the dimensional accuracy of the finished product.

[0048] As an implementation manner, the ratio of the axial length L1 of the auxiliary quasi-circular table portion 311 to the axial length L2 of the cylindrical portion 312 is greater than or equal to 0.2 and less than or equal to 0.5. In this way, after the auxiliary roller 31 bites the rolled piece, the sizing treatment can be performed on the rolled piece. In specific applications, the ratio of the axial length L1 of the auxiliary quasi-circular table portion 311 to the axial length L2 of the cylindrical portion 312 can be 0.2 or 0.3 or 0.4 or 0.5. Of course, as an alternative implementation manner, the ratio of the axial length L1 of the auxiliary quasi-circular table portion 311 to the axial length L2 of the cylindrical portion 312 can also be greater than 0.5.

[0049] As an implementation manner, the ratio of the axial length of the auxiliary roller 31 to half of the radial dimension d of the cylindrical portion 312 is greater than or equal to 1.8 and less than or equal to 3; that is, the ratio of the sum of the axial length L1 of the auxiliary quasi-circular table portion 311 and the axial length L2 of the cylindrical portion 312 to the radius of the cylindrical portion 312 is greater than or equal to 1.8 and less than or equal to 3. In specific applications, the ratio of the sum of the axial length L1 of the auxiliary quasi-circular table portion 311 and the axial length L2 of the cylindrical portion 312 to the radius of the cylindrical portion 312 can be 1.8 or 2.2 or 2.6 or 2.8 or 3.

[0050] As an implementation manner, the entrance taper angle α of the auxiliary quasi-circular table portion 311 is greater than or equal to 1.5° and less than or equal to 3.5°. In specific applications, the entrance taper angle α of the auxiliary quasi-circular table portion 311 can be 1.5° or 2° or 2.5° or 3° or 3.5°.

[0051] As an implementation, the ratio of the radial dimension d of the cylindrical portion 312 (i.e. the radial dimension d of the end of the auxiliary roller 31 away from the outlet 13 described below) to the radial dimension of the rolled piece is greater than or equal to 0.4 and less than or equal to 0.8; that is, the ratio of the diameter of the cylindrical portion 312 to the diameter of the rolled piece is greater than or equal to 0.4 and less than or equal to 0.8. In specific applications, the ratio of the diameter of the cylindrical portion 312 to the diameter of the rolled piece can be 0.4 or 0.5 or 0.6 or 0.7 or 0.8.

[0052] As an implementation, the side surface of the auxiliary frustoconical portion 311 and the side surface of the cylindrical portion 312 are arc-shaped transitions, that is, the generatrix of the auxiliary frustoconical portion 311 and the generatrix of the cylindrical portion 312 are arc-shaped transitions, to reduce the axial resistance of the auxiliary roller 31, wherein the arc-shaped corresponds to a fillet radius R1 greater than or equal to 180 mm.

[0053] As an implementation, referring to Figures 1 to 3 As shown, the roll assembly 10 includes at least two rolls 14 uniformly distributed along the circumference of the rolling line, and all the rolls 14 enclose the deformation zone 11. In this embodiment, the number of rolls 14 is three, and the three rolls 14 are uniformly distributed along the circumference of the rolling line. Of course, in specific applications, the number of rolls 14 can not be limited to three, and as an alternative implementation, the number of rolls 14 can be two or four, etc.

[0054] As an implementation, referring to Figure 2 and Figure 5 As shown, the roll 14 includes a first frustoconical portion 141, a second frustoconical portion 142, and a third frustoconical portion 144 coaxially arranged, and the second frustoconical portion 142 is arranged between the first frustoconical portion 141 and the third frustoconical portion 144; the adjacent bottom surfaces of the first frustoconical portion 141 and the second frustoconical portion 142 are coplanar and have equal diameters, the adjacent bottom surfaces of the second frustoconical portion 142 and the third frustoconical portion 144 are coplanar and have equal diameters, and the connection between the side surface of the first frustoconical portion 141 and the side surface of the second frustoconical portion 142 forms a roll throat 143; wherein the diameter of the first frustoconical portion 141 away from the bottom surface of the second frustoconical portion 142 is smaller than the diameter of the third frustoconical portion 144 away from the bottom surface of the second frustoconical portion 142, and the end of the third frustoconical portion 144 away from the second frustoconical portion 142 encloses the outlet 13. That is, the end of the roll 14 with the larger diameter forms the outlet 13. In specific applications, the auxiliary roller assembly 30 is arranged at the end of the roll 14 with the larger diameter.

[0055] As an implementation form, the generatrix of the third type of frustum 144 is an arc segment, and the center of the arc segment is arranged to face away from the central axis of the third type of frustum 144. In this way, the generatrix of the part forming the outlet 13 is brought closer to the rolling line, thereby increasing the contact area of the rolling roll 14 with the rolled piece at the outlet 13, and making the rolling roll 14 always in contact with the rolled piece at the outlet 13, increasing the axial feeding force on the rolled piece, and making the rolled piece smoothly separate from the top head 20 at the end of the rolling process, further avoiding the occurrence of tail jam.

[0056] As an implementation form, the radius R2 of the arc segment is greater than or equal to 1500 mm. In this way, the generatrix of the part forming the outlet 13 is brought closer to the rolling line, and is closer to parallel.

[0057] As an implementation form, the side surface of the first type of frustum 141 and the side surface of the second type of frustum 142 are arc-shaped at the roll throat 143, that is, the generatrix of the first type of frustum 141 and the generatrix of the second type of frustum 142 are arc-shaped, to reduce the axial resistance of the rolling roll 14. In specific applications, the center of the arc-shaped transition section faces the central axis of the rolling roll 14, and the corresponding arc radius R3 is greater than or equal to 500 mm.

[0058] As an implementation form, the ratio of the axial length L'1 of the first type of frustum 141, the axial length L'2 of the second type of frustum 142, and the axial length L'3 of the third type of frustum 144 is 5:3:4.

[0059] As an implementation form, the ratio of the axial length of the rolling roll 14 (that is, the sum of the axial length L'1 of the first type of frustum 141, the axial length L'2 of the second type of frustum 142, and the axial length L'3 of the third type of frustum 144) to the radial dimension D' of the roll throat 143 (that is, the diameter of the roll throat 143) is greater than or equal to 1.5 and less than or equal to 3.5. In specific applications, the ratio of the axial length of the rolling roll 14 to the radial dimension D' of the roll throat 143 is 1.5 or 2 or 2.5 or 3 or 3.5.

[0060] As an implementation form, the roll surface taper angle γ1 of the first type of frustum 141 and the roll surface taper angle γ2 of the second type of frustum 142 are both greater than or equal to 1° and less than or equal to 4.5°. In specific applications, the roll surface taper angle γ1 of the first type of frustum 141 and the roll surface taper angle γ2 of the second type of frustum 142 can be 1° or 2° or 3° or 4.5°.

[0061] In one implementation, the ratio of the radial dimension D' of the roll throat 143 to the radial dimension of the workpiece (i.e., the diameter of the workpiece) is greater than or equal to 1 and less than or equal to 3. In specific applications, the ratio of the diameter D' of the roll throat 143 to the diameter of the workpiece is 1, 1.5, 2, 2.5, or 3.

[0062] In one embodiment, the rolling angle γ3 of the roll 14 is greater than or equal to 11° and less than or equal to 13°. In specific applications, the rolling angle γ3 of the roll 14 is 11°, 12°, or 13°.

[0063] In one embodiment, the axial distance between the auxiliary roller assembly 30 and the roll assembly 10 is greater than or equal to 100 mm and less than or equal to 150 mm. In specific applications, the axial distance between the auxiliary roller assembly 30 and the roll assembly 10 can be 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, or 150 mm.

[0064] In one implementation, the feed angle of the auxiliary roll assembly 30 is the same as that of the roll assembly 10. That is, the feed angle of the auxiliary roll 31 is the same as that of the roll 14, so as to avoid the auxiliary roll 31 from hindering the movement of the workpiece along the rolling line, and to help the workpiece continue to move normally after being gripped by the auxiliary roll assembly 30.

[0065] As one implementation method, refer to Figure 2 and Figure 3 As shown, the roll assembly 10 also includes a guide plate 15, which is disposed between adjacent rolls 14 to prevent the workpiece from being squeezed into the gap between adjacent rolls 14 during the rolling process.

[0066] In one implementation, the end of the mandrel 20 near the outlet 13 is a hemispherical structure to facilitate the rounding of the rolled piece.

[0067] Furthermore, referring to Figure 1 , Figure 2 and Figure 7As shown, the embodiment of the present application further provides a cross rolling mill 1000, which comprises the rolling mechanism 100, the first power mechanism 200, the second power mechanism 300 and the controller 400; the first power mechanism 200 is used to drive the auxiliary roller assembly 30 to move; the second power mechanism 300 is used to drive the roller assembly 10 to move; the controller 400 is electrically connected with the first power mechanism 200 and the second power mechanism 300 respectively, and the controller 400 is used to control the first power mechanism 200 to drive the auxiliary roller assembly 30 to move, and control the second power mechanism 300 to drive the roller assembly 10 to move, so that the linear speed and direction of the part of the rolled piece and the auxiliary roller assembly 30 contacted when the auxiliary roller assembly 30 drives the rolled piece to move are the same with the linear speed and direction of the part of the rolled piece and the roller assembly 10 contacted when the roller assembly 10 drives the rolled piece to move at the outlet 13. In this way, after the rolled piece is gripped by the auxiliary roller assembly 30, the auxiliary roller assembly 30 avoids hindering the movement of the rolled piece along the rolling line, which helps the rolled piece to continue to move normally along the rolling line.

[0068] As an implementation, the first power mechanism 200 is used to drive each auxiliary roller 31 to rotate, and the second power mechanism 300 is used to drive each roller 14 to rotate. In this embodiment, the number of auxiliary rollers 31 is four, and the first power mechanism 200 drives each auxiliary roller 31 to rotate at the same speed and in the same direction; the number of rollers 14 is three, and the second power mechanism 300 drives each roller 14 to rotate at the same speed and in the same direction.

[0069] As an implementation, the feed angle of the auxiliary roller 31 is the same with the feed angle of the roller 14, the speed of the auxiliary roller 31 rotating driven by the first power mechanism 200 controlled by the controller 400 meets the following relationship with the speed of the roller 14 rotating driven by the second power mechanism 300 controlled by the controller 400:

[0070] n = η0Dn B / d

[0071] Wherein, η0 represents the axial slip coefficient of the rolled piece at the outlet 13; D represents the radial size of the roller 14 corresponding to the outlet 13, in this embodiment, D represents the radial size of the end of the third type of circular truncated cone part 144 away from the second type of circular truncated cone part 142; n represents the speed of the roller 14; d represents the radial size of the end of the auxiliary roller 31 away from the outlet 13. B

[0072] In specific application, when the feed angle of the auxiliary roller 31 is the same with the feed angle of the roller 14, the axial speed of the rolled piece at the outlet 13 meets the following relationship:

[0073]

[0074] The speed of the auxiliary roller 31 meets the following relationship:​

[0075]

[0076] wherein, V z represents the axial speed of the rolled piece at the outlet 13, and β represents the feed angle of the auxiliary roller 31 and the feed angle of the roller 14. Therefore, the rotation speed of the auxiliary roller 31 and the rotation speed of the roller 14 satisfy the following relationship:

[0077] n = η0Dn B / d

[0078] Embodiment Two:

[0079] Referring to Figures 5 to 7 the drawings, the embodiment differs from the rolling mechanism 100 and the cross rolling mill 1000 provided in Embodiment One mainly in the structure of the roller 14; specifically, in Embodiment One, the roller 14 comprises a first type of frustum 141, a second type of frustum 142 and a third type of frustum 144; while in the present embodiment, the roller 14 comprises a first type of frustum 141 and a second type of frustum 142.

[0080] As an implementation, the ratio of the axial length L'1 of the first type of frustum 141 and the axial length L'2 of the second type of frustum 142 is 3:5.

[0081] In addition to the above differences, the rolling mechanism 100 and the cross rolling mill 1000 and the components thereof provided in the present embodiment can be designed with reference to Embodiment One, and will not be described in detail here.

[0082] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made under the inventive concept of the present application, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A rolling mechanism for a skew rolling machine, characterized by, The utility model relates to a rolling mill for rolling a workpiece, comprising: a roll assembly provided with a deformation zone and an inlet and an outlet communicating with the deformation zone, the roll assembly being used for rolling the workpiece entering the deformation zone from the inlet and driving the workpiece to move along a rolling line; a plug provided in the deformation zone and used for piercing the workpiece passing through the deformation zone; an auxiliary roll assembly provided on the side of the roll assembly provided with the outlet, the auxiliary roll assembly being used for clamping the workpiece and driving the workpiece to continue moving along the rolling line when the workpiece moves from the outlet to outside the deformation zone; the auxiliary roll assembly comprises at least two auxiliary rolls uniformly distributed along the rolling line in the circumferential direction, the auxiliary roll comprising an auxiliary quasi-circular frustum and a cylindrical portion coaxially arranged with the auxiliary quasi-circular frustum; the cylindrical portion is arranged at one end of the auxiliary quasi-circular frustum away from the outlet, the radial dimension of the auxiliary quasi-circular frustum gradually increases in the direction away from the outlet, and the radial dimension of the one end of the auxiliary quasi-circular frustum away from the outlet is equal to the radial dimension of the cylindrical portion; the vertical distance between the generatrix of the cylindrical portion and the rolling line is equal to half of the radial dimension of the workpiece; the axial distance between the auxiliary roll assembly and the roll assembly is greater than or equal to 100 mm and less than or equal to 150 mm.

2. The rolling mechanism according to claim 1, characterized in that The number of the auxiliary rolls is four.

3. Rolling mechanism according to claim 1 or 2, characterized in that the ratio of the axial length of the auxiliary quasi-circular frustum to the axial length of the cylindrical portion is greater than or equal to 0.2 and less than or equal to 0.5; or the ratio of the axial length of the auxiliary roll to half of the radial dimension of the cylindrical portion is greater than or equal to 1.8 and less than or equal to 3; or the inlet cone angle of the auxiliary quasi-circular frustum is greater than or equal to 1.5° and less than or equal to 3.5°; or the ratio of the radial dimension of the cylindrical portion to the radial dimension of the workpiece is greater than or equal to 0.4 and less than or equal to 0.

8.

4. The rolling mechanism of claim 1, wherein The roll assembly comprises at least two rolls uniformly distributed along the rolling line in the circumferential direction, and all the rolls enclose the deformation zone.

5. The rolling mechanism according to claim 4, characterized in that The roll comprises a first quasi-circular frustum and a second quasi-circular frustum coaxially arranged; the adjacent bottom surfaces of the first quasi-circular frustum and the second quasi-circular frustum are coplanar and have equal diameters, and the connection between the side surface of the first quasi-circular frustum and the side surface of the second quasi-circular frustum forms a roll throat; wherein the diameter of the first quasi-circular frustum away from the bottom surface of the second quasi-circular frustum is smaller than the diameter of the second quasi-circular frustum away from the bottom surface of the first quasi-circular frustum, and one end of the second quasi-circular frustum away from the first quasi-circular frustum encloses the outlet.

6. The rolling mechanism of claim 4, wherein, The roll comprises a first quasi-circular frustum, a second quasi-circular frustum and a third quasi-circular frustum coaxially arranged, and the second quasi-circular frustum is arranged between the first quasi-circular frustum and the third quasi-circular frustum; the adjacent bottom surfaces of the first quasi-circular frustum and the second quasi-circular frustum are coplanar and have equal diameters, the adjacent bottom surfaces of the second quasi-circular frustum and the third quasi-circular frustum are coplanar and have equal diameters, and the connection between the side surface of the first quasi-circular frustum and the side surface of the second quasi-circular frustum forms a roll throat; The diameter of the first type of circular truncated cone away from the bottom surface of the second type of circular truncated cone is smaller than the diameter of the third type of circular truncated cone away from the bottom surface of the second type of circular truncated cone, and the end of the third type of circular truncated cone away from the second type of circular truncated cone encloses the outlet.

7. The rolling mechanism according to claim 6, characterized in that The generatrix of the third type of circular truncated cone is an arc segment, and the center of the arc segment is arranged opposite to the central axis of the third type of circular truncated cone.

8. The rolling mechanism of claim 7, wherein, The radius of the arc segment is greater than or equal to 1500 mm.

9. Rolling mechanism according to any one of claims 6 to 8, characterized in that The ratio of the axial length of the first type of circular truncated cone, the axial length of the second type of circular truncated cone, and the axial length of the third type of circular truncated cone is 5:3:

4.

10. Rolling mechanism according to any one of claims 5 to 8, characterized in that The roll surface taper angle of the first type of circular truncated cone and the roll surface taper angle of the second type of circular truncated cone are both greater than or equal to 1° and less than or equal to 4.5°; or, The ratio of the axial length of the roll to the radial dimension of the roll throat is greater than or equal to 1.5 and less than or equal to 3.5; or, The ratio of the radial dimension of the roll throat to the radial dimension of the rolled piece is greater than or equal to 1 and less than or equal to 3; or, The rolling angle of the roll is greater than or equal to 11° and less than or equal to 13°.

11. Rolling mechanism according to any one of claims 4 to 8, characterized in that The number of the rolls is three.

12. The rolling mechanism of claim 1, wherein, The feed angle of the auxiliary roll assembly is the same as the feed angle of the roll assembly.

13. A roll forming machine characterized by, Comprising: The rolling mechanism of any one of claims 1 to 12; A first power mechanism for driving the auxiliary roll assembly to move; A second power mechanism for driving the roll assembly to move; A controller electrically connected with the first power mechanism and the second power mechanism respectively, the controller being configured to control the first power mechanism to drive the auxiliary roll assembly to move, and control the second power mechanism to drive the roll assembly to move, so that the magnitude and direction of the linear velocity of the part of the rolled piece and the auxiliary roll assembly in contact when the rolled piece is moved by the auxiliary roll assembly are the same as the magnitude and direction of the linear velocity of the part of the rolled piece and the roll assembly in contact when the rolled piece is located at the outlet and is moved by the roll assembly.

14. The calendering mill of claim 13, wherein The auxiliary roll assembly comprises at least two auxiliary rolls uniformly distributed along the circumference of the rolling line, and the first power mechanism is configured to drive each of the auxiliary rolls to rotate; The roll assembly comprises at least two rolls uniformly distributed along the circumference of the rolling line, and the second power mechanism is configured to drive each of the rolls to rotate; The feed angle of the auxiliary roll is the same as the feed angle of the roll, and the rotational speed of the auxiliary roll driven by the first power mechanism controlled by the controller and the rotational speed of the roll driven by the second power mechanism controlled by the controller satisfy the following relationship: ， wherein, represents the axial slip coefficient of the rolled piece at the exit, D represents the radial dimension of the roll corresponding to the exit, represents the rotational speed of the roll, d represents the radial dimension of the auxiliary roll at the end far from the exit.

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