CN210280185U

CN210280185U - Cold rolling pass structure for rolling hexagonal pipe by circular pipe

Info

Publication number: CN210280185U
Application number: CN201921348290.3U
Authority: CN
Inventors: 曹文新
Original assignee: Zhejiang Jiaxiang Precision Machinery Technology Co ltd
Current assignee: Zhejiang Jiaxiang Precision Machinery Technology Co ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-04-10
Anticipated expiration: 2029-08-20

Abstract

The utility model discloses a cold rolling pass structure of rolling hexagon pipe of pipe, the cold rolling pass uses the center of pipe as the centre of a circle, is enclosed to close by the groove of three roll and forms, the cross-sectional profile of groove includes groove face (1) of two symmetries, and the junction of two groove faces (1) is equipped with first circular arc section (2), all is equipped with parabolic segment (3) on every groove face (1), is connected with straightway (4) between parabolic segment (3) and first circular arc section (2), and parabolic segment (3) are kept away from straightway (4) one end and are connected with second circular arc section (5). The utility model discloses can effectively improve the yield and the size precision of hexagonal pipe after rolling.

Description

Cold rolling pass structure for rolling hexagonal pipe by circular pipe

Technical Field

The utility model relates to a roll pass for cold rolling hexagonal pipe, especially a cold rolling pass structure of rolling hexagonal pipe of pipe.

Background

The existing cold rolling method for the hexagonal tube adopts a hexagonal tube blank after cold rolling as a raw material, and uses a plurality of rollers to surround and form a regular hexagonal hole pattern structure to perform cold rolling on the tube blank. However, when the circular tube is used as a cold rolling raw material, compared with a hexagonal tube, the circular tube has the characteristics of low raw material cost, large purchase quantity, good processing precision, high production efficiency and wide application range, so how to cold-roll the circular tube as a blank to obtain the hexagonal tube is a problem to be solved by manufacturers at present. However, when the existing hexagonal tube cold rolling pass is used for rolling a round tube, the round tube can be greatly and unevenly deformed, so that the rolled hexagonal tube has low dimensional accuracy and has the defects of partial deformation or pits, and the rolled hexagonal tube cannot meet the specified standard of the hexagonal tube on the market. Therefore, there is a need for a cold-rolled pass structure for rolling a round tube into a hexagonal tube that can improve the yield and dimensional accuracy of the hexagonal tube after rolling.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cold rolling pass structure of rolling hexagonal pipe of pipe. The method can effectively improve the finished product ratio and the dimensional accuracy of the rolled hexagonal tube.

The technical scheme of the utility model: a cold-rolled pass structure for rolling a hexagonal pipe by a round pipe is characterized in that the cold-rolled pass structure takes the center of the round pipe as the center of a circle and is formed by encircling grooves of three rollers: the section profile of the rolling groove comprises two symmetrical groove surfaces, a first arc section is arranged at the joint of the two groove surfaces, a parabolic section is arranged on each groove surface, a straight line section is connected between the parabolic section and the first arc section, and one end, far away from the straight line section, of the parabolic section is connected with a second arc section.

In the cold-rolled pass structure for rolling the hexagonal tube by using the round tube, the included angle α between the two straight line sections is 120-125 degrees.

In the cold-rolled pass structure for rolling the hexagonal tube by using the circular tube, a line from a connecting point between the parabolic segment and the straight segment to the center of a circle is taken as a flange line, and an included angle β between the flange lines on two sides is 60-65 degrees.

In the cold-rolled pass structure for rolling the hexagonal tube through the circular tube, the roller on the outer side of the second arc section is provided with the attaching surface, the attaching surface is tangent to the second arc section, and an included angle gamma between the attaching surface and the straight line section is 60-65 degrees.

Compared with the prior art, the utility model discloses a first circular arc section, parabola section and the second circular arc section that set up on the groove of rolling at the roll can effectively reduce the contact stress of roll when with the pipe contact, and avoid the steel sticking problem on pipe apex angle limit, thereby alleviate the size defect that the pipe produced when warping, the hexagon pipe that makes the rolling obtain has good yield and dimensional accuracy, through injecing contained angle α, contained angle β and contained angle gamma's angle, can avoid the overfilling problem of pass when rolling, thereby further improve the surface quality and the opposite distance precision of hexagonal pipe, so, the utility model discloses can effectively improve the yield and the dimensional accuracy of hexagonal pipe after rolling.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The labels in the figures are: 1-groove surface, 2-first arc section, 3-parabola section, 4-straight line section, 5-second arc section and 6-binding surface.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Examples are given. A cold-rolled pass structure for rolling a hexagonal pipe by using a circular pipe is formed by encircling rolling grooves of three rollers by taking the center of the circular pipe to be rolled as a circle center, the cross section profile of each rolling groove comprises two symmetrical groove surfaces 1, a first arc section 2 is arranged at the joint of the two groove surfaces 1, a parabolic section 3 is arranged on each groove surface 1, the parabolic sections 3 on the two groove surfaces 1 are located on the same parabola, a straight section 4 is connected between each parabolic section 3 and the first arc section 2, one end, far away from the straight section 4, of each parabolic section 3 is connected with a second arc section 5, and the center distance between the second arc sections 5 on the two sides is larger than the opposite side distance of the hexagonal pipe.

The included angle α (commonly called as the side wall angle) between the two straight line segments 4 is 120-125 degrees.

The line from the connecting point between the parabolic segment 3 and the straight segment 4 to the center of the circle is taken as a flange line, and the included angle β (commonly called as a flange angle) between the flange lines at the two sides is 60-65 degrees.

The roller outside the second circular arc section 5 is provided with a binding surface 6, the included angle between the binding surfaces 6 at two sides is 120 degrees, the roller is mutually bound through the binding surface 6 when being enclosed, the binding surface 6 is tangent with the second circular arc section 5, and the included angle gamma (commonly known as a disengaging angle) between the binding surface 6 and the straight line section 4 is 60-65 degrees.

The working principle of the utility model is that on the basis of the traditional V-shaped groove rolling, through setting up the first arc section 2, the parabolic section 3 and the second arc section 5, the size error and the surface pit of the round pipe when cold rolling caused by uneven deformation can be effectively relieved, the hexagonal pipe after rolling can be controlled within +/-0.05 mm to the margin precision, and the hexagonal pipe surface has no adhering metal, uneven rolling defects, through the specific setting to the side wall angle α, the flange angle β and the departure angle gamma, the angle of the groove surface 1, the length of the parabolic section 3 and the position of the groove to the centre of a circle can be further optimized respectively, thereby improving the cold rolling effect of the round pipe.

Claims

1. A cold-rolled pass structure for rolling a hexagonal pipe by using a circular pipe is characterized in that the cold-rolled pass structure is formed by encircling grooves of three rollers by taking the center of the circular pipe as the center of a circle, and comprises the following steps: the section profile of the rolling groove comprises two symmetrical groove surfaces (1), a first arc section (2) is arranged at the joint of the two groove surfaces (1), a parabolic section (3) is arranged on each groove surface (1), a straight line section (4) is connected between the parabolic section (3) and the first arc section (2), and one end, away from the straight line section (4), of the parabolic section (3) is connected with a second arc section (5).

2. The cold-rolled pass structure for rolling a hexagonal tube into a round tube according to claim 1, wherein an included angle α between the two straight line segments (4) is 120-125 °.

3. The cold-rolled pass structure for rolling a hexagonal tube into a round tube according to claim 1, wherein a line from a connection point between the parabolic segment (3) and the linear segment (4) to a circle center is taken as a flange line, and an included angle β between the flange lines at two sides is 60-65 degrees.

4. The cold-rolled pass structure for rolling a hexagonal tube around a round tube according to claim 1, wherein: and a binding surface (6) is arranged on the roller at the outer side of the second arc section (5), the binding surface (6) is tangent to the second arc section (5), and the included angle gamma between the binding surface (6) and the straight line section (4) is 60-65 degrees.