JP3004479U - Tube rolling equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a pipe rolling apparatus capable of efficiently rolling a raw pipe into a uniform cross-sectional shape without deviation in wall thickness. [Structure] A mandrel bar 33 having a base 33a rotatably supported, a core pipe P having a mandrel bar 33 inserted therein and being rotatable about a pipe core Pc so as to be movable in the pipe core Pc direction, and a mandrel bar 33. Of the outer peripheral portion near the head 33b of each of the outer peripheral portions 33b, which are different from each other and have axial cores a, b, and c which are not parallel to the core Pc and are axially supported so as to be pressed against the peripheral portion of the raw pipe P. Rolling rolls Ra, Rb, Rc and rolling rolls Ra, R
Both b and Rc continuously rotate in one direction, and rolling rolls Ra, Rb, and Rb in the same direction as the above rotation direction.
A roll drive mechanism 7 having a structure for revolving Rc.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe rolling apparatus, and is devised so that a raw pipe can be efficiently rolled into a uniform cross-sectional shape without deviation in wall thickness.

[0002]

[Prior art]

 The conventional method of rolling a seamless pipe into a uniform cross-sectional shape without deviation in wall thickness is to rotate a plurality of semi-circular groove rolls back and forth to make the pipe inserted into the core bar in the longitudinal direction. Rolling is performed by rotating the blank pipe by a predetermined angle for each pass and rolling several times, or by rolling the partial circular groove continuously and inserting it into the core bar. H. Pipe is rolled in the longitudinal direction, the raw pipe is rotated by a predetermined angle for each pass, and rolling is repeated several times. T. The P method is in practical use.

[0003]

[Problems to be solved by the device]

 In the above conventional method, in order to improve the finish of the gap between the rolls, after one pass, the tube is returned to its original position, the tube is rotated by a predetermined angle, and rolling is repeated several times. It takes time and the machining efficiency is extremely poor. In addition, the equipment cost is high because a return movement device with poor operating efficiency is required just to move the pipe back to its original position. This invention proposes a tube rolling apparatus that solves the above-mentioned problem of the conventional method that the working efficiency is extremely poor and can efficiently roll the raw tube into a uniform cross-sectional shape without deviation of the wall thickness.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the structure of the present invention is such that a base 33a is rotatably supported, and a core bar 33 is inserted so that the core 33 can be rotated around the core Pc and can be moved in the direction of the core Pc. The outer circumference of the core P is different from that of the core P that is different from each other at the outer peripheral position near the head 33b of the cored bar 33 and is not parallel to the core Pc. A plurality of rolling rolls Ra, Rb, Rc axially supported so as to be in pressure contact with the rolling portion and rolling rolls Ra, Rb, Rc are continuously rotated in one direction, and the rotation direction is And a roll driving mechanism 7 having a structure for revolving the rolling rolls Ra, Rb, and Rc in the same direction.

[0005]

[Action]

 When the roll driving mechanism 7 is driven so that the plurality of rolling rolls Ra, Rb, Rc continuously rotate in one direction and revolves in the same direction as the rotation direction, they are different from each other. A plurality of rolling rolls Ra, Rb, Rc axially supported by shaft cores a, b, c which are not parallel to the pipe core Pc roll around the outer periphery of the raw pipe P in a spiral shape, The raw pipe P is rolled in cooperation with 33. The raw pipe P is continuously fed in the pipe core Pc direction while rotating around the pipe core Pc and the component force in the pipe core Pc direction received from the rolling rolls Ra, Rb, Rc. . Since the mandrel bar 33 is rotatably supported, it is rotated with respect to the base pipe P under the influence of pressure contact rotation from both the rolling rolls Ra, Rb, Rc and the base pipe P, and the base pipe P Similarly to the outer peripheral surface, the inner peripheral surface is also rolled into a structure inclined with respect to the direction of the core Pc of the raw pipe P and finished uniformly. When the raw pipe P is sent in the direction of the pipe core Pc and passes through the rolling rolls Ra, Rb, Rc, the rolling is completed.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a main part of the tube rolling apparatus, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a perspective view of FIG. In FIG. 1, the left part is a box-shaped rolling mill frame 1, and the right part is a cylindrical roll support frame 2. At the left end of the rolling mill frame 1, the inlet side guide tube 3 for inserting and supporting the unprocessed portion Pa of the raw pipe P is inserted, and at the right end of the roll support frame 2 the processed portion Pb of the raw pipe P is inserted. The exit side guide cylinders 4 to be supported are provided respectively. A plurality of roll shaft supports 5 (three in the illustrated example) are attached to the right side portion of the roll support frame 2 with a bolt 6.

Rolling rolls Ra, Rb, and Rc are rotatably supported by bearings 6 on the roll shaft supports 5, 5 and 5, and shaft centers a, b, and R of the rolling rolls Ra, Rb, and Rc are supported. c is different from each other as shown in FIG. 3 and is set not to be parallel to the cylinder core Pc of the raw pipe P supported by the inlet side guide cylinder 3 and the outlet side guide cylinder 4. . The roll supporting frame 2 is supported by the rolling mill frame 1 so as to be rotatable around the core Pc of the raw pipe P. When the rolling rolls Ra, Rb, Rc are rotated about their respective axis cores a, b, c, the rolling rolls are revolved around the core Pc of the raw pipe P integrally with the roll support frame 2. The drive mechanism 7 is installed in the rolling mill frame 1.

The illustrated roll driving mechanism 7 connects the rolling rolls Ra, Rb, and Rc to the planet gear 8 via a self-coupling shaft 9, and a sun gear 10 meshing with the planet gear 8 is rolled. It is composed of a planetary gear mechanism that is driven by a roll driving motor 11 and drives the roll supporting frame 2 by a supporting frame driving motor 12. FIG. 4 is an explanatory view of the roll driving mechanism 7 as seen from the front. As shown in FIG. 1, the specific structure of the roll driving mechanism 7 is such that the cylindrical outer shaft 13 is coaxially supported by the bearing 14 on the rolling mill frame 1 so as to be concentric with the core Pc of the raw pipe P 1, and has a cylindrical shape. The inner shaft 15 is internally fitted and rotatably supported by the outer shaft 13 by bearings 16 and 17, and the inner shaft 15 has an inner diameter capable of inserting the unprocessed portion Pa of the raw pipe P.

A bevel gear 18 is formed on the left side of the roll support frame 2, and this bevel gear 18 is fitted and fixed on the right side of the outer shaft 13, and is provided on the roll support frame 2 in the illustrated example. The gear shaft support 19 is fitted and fixed in the hole 2 a, and the gear shaft 20 of the planetary gear 8 is supported by the bearing 21 in the gear shaft support 19. A sun gear 10 that meshes with the planet gear 8 is fitted to the inner shaft 15 that protrudes to the right from the outer shaft 13. The right end of the inner shaft 15 is supported by a bearing 22 on a gear shaft support 19. Has been done. The roll shafts 23 of the rolling rolls Ra, Rb, Rc are connected to the gear shafts 20 of the respective planetary gears 8 by a universal joint shaft 9.

The bevel pinion 24 meshing with the bevel gear 18 has its pinion shaft 25 pivotally supported by the rolling mill machine frame 1 by the bear ring 26 and driven by the support frame drive motor 12 via the speed change mechanism 27. . A bevel gear 28 is fitted to the left portion of the inner shaft 15, and a bevel pinion 29 meshing with the bevel gear 28 has a pinion shaft 30 supported by a bearing 31 on the rolling mill frame 1 and a transmission mechanism 32. And is driven by the roll driving motor 11.

With the configuration of the roll drive mechanism 7, when the roll drive motor 11 is driven, the sun gear 10 is rotated by the transmission mechanism 32 through the bevel pinion 29 and the bevel gear 28 to rotate the support frame. When the motor 12 is driven, the roll support frame 2 is rotated by the transmission mechanism 27 via the bevel pinion 24 and the bevel gear 18, and the planetary gear 8 is rotated by the sun gear 10 and the roll support frame 2. While revolving around the axis 20, it revolves around the sun gear 10, that is, around the core Pc of the raw pipe P integrally with the roll support frame 2. The rolling rolls Ra, Rb, Rc connected by the universal joint shaft 9 also revolve around the core Pc of the raw pipe P while rotating around the roll shaft 23 integrally with the planetary gear 8. At this time, shift control is performed by the shift mechanisms 27 and 32 such that the rolling directions Ra, Rb, and Rc of the rolling rolls are in the same direction as the revolution direction.

The cored bar 33 inserted into the raw pipe P is rotatably supported around the core by a cored bar supporter 34 at the left side of the rolling mill machine frame 1 at its base 33 a, and the cored bar supporter 34 Is formed in a structure not shown so that the core bar 33 can be moved toward or away from the rolling mill machine frame 1 along the core Pc of the base pipe P, that is, the bar core. Then, at the rolling operation position shown in FIG. 1, the position of the core bar 33 is set so that the rolling rolls Ra, Rb, Rc are located outside the outer periphery of the head 33b of the core bar 33. A guide cylinder 35 is attached to the right end of the gear shaft support 19, and an intermediate guide cylinder 36 that inserts and supports the unprocessed portion Pa of the raw pipe P is supported by this guide cylinder 35 via a bearing 37. Has been done. In the illustrated example, the outlet side guide cylinder 4 is supported by a guide cylinder 38 attached to the right end of the roll support frame 2 and a vibration isolator 39 of the rolling mill frame 1 via bearings 40 and 41. .

Next, the operation of this tube rolling apparatus will be described. At the left position of the rolling mill machine frame 1, the core bar 33 is inserted from the left end of the base pipe P by the core bar support device 34, and a not-shown mouthing portion (squeezed small diameter part) formed on the base pipe P. The head 33b of the cored bar 33 abuts on the inner peripheral surface of the core bar 33, and the cored bar 33 and the base pipe P move to the right by the subsequent rightward movement of the cored bar support device 34. The right end of the unprocessed portion Pa of the raw pipe P reaches the vicinity of the inner side of the inner circumference of the rolling rolls Ra, Rb, Rc, and the rightward movement of the core bar supporting device 34 is stopped.

Next, the roll drive motor 11 and the support frame drive motor 12 of the roll drive mechanism 7 are driven. The sun gear 10 is rotated by the speed change mechanism 32, and the roll support frame 2 is rotated by the speed change mechanism 27 about the core Pc of the raw pipe P. Each of the planetary gears 8 revolves around the gear shaft 20 by the sun gear 10 and the roll supporting frame 2 and revolves around the core Pc of the raw pipe P integrally with the roll supporting frame 2. The rolling rolls Ra, Rb, Rc connected by the universal joint shaft 9 also revolve around the pipe core Pc of the raw pipe P while rotating around the roll shaft 23 integrally with the planetary gear 8. At this time, shift control is performed by the shift mechanisms 27 and 32 such that the rolling directions Ra, Rb, and Rc of the rolling rolls and the revolving direction are the same direction illustrated by the arrows in FIGS. 3 and 4. Rolling rolls Ra, Rb, and Rc which are different from each other and are axially supported by axes a, b, and c which are not parallel to the core Pc of the shell P roll the outer circumference of the shell P in a spiral shape. The core pipe P is rolled in cooperation with the head 33b of the cored bar 33.

The raw pipe P is continuously rotated in the pipe core Pc direction while rotating around the pipe core Pc and component force in the pipe core Pc direction received from the rolling rolls Ra, Rb, Rc. Sent to. Since the mandrel bar 33 is rotatably supported, the mandrel bar 34 is attached to the base pipe P under the influence of the pressure contact rotation of the head 33b from both the rolling rolls Ra, Rb, Rc and the base pipe P. The inner peripheral surface of the raw pipe P is evenly finished like the outer peripheral surface. The rolling is completed when the raw pipe P is sent in the direction of the pipe core Pc and the unprocessed portion Pa passes through the rolling rolls Ra, Rb, Rc.

Since the rolling is completed when one pass is completed in this manner, the raw tube is returned to the original position after each one pass, and the raw tube is rotated by a predetermined angle before rolling as in the conventional method described above. This invention solves the problems that the machining efficiency is extremely poor because it is repeated several times, and that the equipment cost is high due to the need for a return moving device with poor operating efficiency just to move the tube back to its original position. Was done. The rolling rolls Ra, Rb, Rc spirally roll on the outer peripheral portion of the raw pipe P, and the mandrel bar 33 rotates with respect to the raw pipe P without moving in the pipe core Pc direction. Both the outer peripheral surface and the inner peripheral surface of the pipe P are rolled into a structure that is inclined with respect to the direction of the core Pc of the base pipe P to improve the structure to a dense structure in the pipe core Pc and the direction perpendicular to the pipe core Pc. It was decided that the steel sheet could be efficiently rolled into a uniform cross-sectional shape without any deviation in wall thickness.

The roll drive mechanism 7 can use not only the planetary gear mechanism illustrated in FIG. 1 but also a structure (not shown) having the same function.

[0018]

[Effect of device]

 According to the pipe rolling apparatus of the present invention, a plurality of rolling rolls Ra, Rb, Rc which are different from each other and are axially supported by the shaft cores a, b, c which are not parallel to the pipe core Pc are provided. The core bar 33, which is rotatably supported by rolling around the outer peripheral portion of the pipe P, is affected by the pressure contact rotation from both the rolling rolls Ra, Rb, Rc and the raw pipe P. By rotating with respect to P, the outer peripheral surface and the inner peripheral surface of the raw pipe P are rolled into a structure inclined with respect to the core Pc direction of the raw pipe P, and the core Pc and the core Pc are dense in the direction perpendicular to the core Pc. The structure is improved, and at the same time, the raw pipe P is efficiently rolled into a uniform cross-sectional shape without unevenness in wall thickness to finish it uniformly.

The raw pipe P continuously rotates in the direction of the pipe core Pc while rotating around the pipe core Pc and the component force in the direction of the pipe core Pc received from the rolling rolls Ra, Rb, Rc. When one pass is completed, the rolling is completed. Therefore, as in the conventional method described above, the blank tube is returned to its original position after each pass, and the blank tube is rotated by a predetermined angle before rolling. This method is repeated several times, resulting in extremely poor machining efficiency, and the need for a return moving device with poor operating efficiency just to move the pipe back to its original position, resulting in high equipment costs. Solved by.

[Brief description of drawings]

FIG. 1 is a front view of a main part of a tube rolling apparatus of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a perspective view of FIG. 2.

FIG. 4 is an explanatory view of the roll drive mechanism of FIG. 1 as seen from the front.

[Explanation of symbols]

 7 Roll Drive Mechanism 33 Core Bar 33a Base 33b Head P Element Pipe Pc Pipe Core Ra, Rb, Rc Rolling Roll a, b, c Axial Core

Claims (1)

[Scope of utility model registration request] 1. A cored bar having a base rotatably supported,
It is different from each other at the outer peripheral position near the head of the core bar and parallel to the core, with the core bar inserted and rotatable around the core and movably supported in the core direction. A plurality of rolling rolls each having a non-axial core and axially supported so as to come into pressure contact with the outer peripheral portion of the raw pipe, and all of the rolling rolls are rotated in one direction, and are in the same direction as the rotation direction. And a roll driving mechanism having a structure for revolving the rolling roll.