CN108580565B

CN108580565B - Design method of low-energy-consumption guide plate of two-roller skew rolling puncher

Info

Publication number: CN108580565B
Application number: CN201810312770.8A
Authority: CN
Inventors: 魏朝辉; 路浩煜; 吴春京
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2018-04-09
Filing date: 2018-04-09
Publication date: 2020-01-14
Anticipated expiration: 2038-04-09
Also published as: CN108580565A

Abstract

The invention provides a guide plate design method for realizing low-energy-consumption rolling of a two-roll skew rolling puncher. The design is characterized in that on a working surface where the guide plate is in friction contact with the steel pipe, a projection line of a rolling central line on the guide plate surface is taken as a boundary line, one side guide plate surface where the pipe body rotates into the guide plate surface is an arc surface, and one side guide plate surface where the pipe body rotates away from the guide plate surface is taken as a plane. The center of the arc surface of the guide plate is located at an eccentric distance relative to the rolling center line, and the value Le of the eccentric distance is (0-0.2) the diameter value of the tube blank. The invention can effectively reduce the rolling load during two-roller cross piercing rolling, improves the service life of the guide plate, forms considerable economic benefit from the process cost, and creates conditions for further excavating equipment potential and developing high-grade hard-deformation steel products.

Description

Design method of low-energy-consumption guide plate of two-roller skew rolling puncher

Technical Field

The invention relates to a design method of a guide plate of a two-roll skew rolling puncher. In particular to a guide plate design method for realizing low-energy consumption rolling by a two-roller skew rolling puncher.

Background

In the production of seamless steel pipes, a piercing machine is one of the important main deformation apparatuses. In the rolling link of the piercing mill, the solid tube blank is rolled by a pass consisting of a roller, a guide plate and a top head to obtain a hollow capillary tube. In the pass structure of the piercing machine, a roller is a main transmission outer deformation tool, a top is an inner deformation tool which rotates along with the deformed metal, and a guide plate is a fixed outer deformation tool. The guide plate plays a role in guiding the deformed steel pipe, limiting the transverse deformation of the hollow billet and closing the pass in pass rolling, and is an important component of the pass structure.

Because the guide plate is fixed, the guide plate and the steel pipe in the spiral advancing movement generate obvious relative friction movement to do work and consume energy, and the part of the energy consumption is also an important component of total energy consumption in the steel pipe deformation process. With the high-end product of steel pipe production enterprises, because the piercing rolling deformation energy consumption of high-grade hard-deformation steel is very high, under the condition that a device motor is not changed, the rolling energy consumption can be reduced only by improving the hole pattern design, the potential energy of the device can be excavated, and the product range is expanded; on the other hand, with the market competition of low-end products in steel pipes becoming more severe, the economical production with lower energy consumption and low cost also becomes the inevitable pursuit of the development of the production process of enterprises. Existing guide plate designs have not been able to meet the above requirements.

Disclosure of Invention

The invention provides a guide plate design method for realizing low-energy-consumption rolling, aiming at solving the problem of overhigh energy consumption of piercing and rolling caused by the existing design of a guide plate of a two-roll skew rolling piercer.

The design method is characterized in that on a working surface where the guide plate and the steel pipe are in friction contact, a projection line of a rolling central line on the guide plate surface is taken as a boundary line, one side guide plate surface where the pipe body rotates into the guide plate surface is an arc surface, and one side guide plate surface where the pipe body rotates away from the guide plate surface is a plane.

The center of the arc surface of the guide plate is located at an eccentric distance relative to the rolling center line, and the value Le of the eccentric distance is (0-0.2) the diameter value of the tube blank.

Compared with the existing design method, the invention has the beneficial effects that: the rolling load during two-roller skew piercing rolling is effectively reduced, the service life of the guide plate is prolonged, considerable economic benefits are formed from the process cost, and conditions are created for further excavating equipment potential and developing high-grade hard-deformation steel products.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a closed hole type structure of a conventional two-roll skew rolling piercer.

FIG. 2 is a schematic diagram of the adjustment of a conventional two-roll cross-piercing mill guide in use.

FIG. 3 is a schematic diagram of a closed hole type structure of a perforating machine for designing a guide plate.

FIG. 4 is a schematic view of the present invention showing the adjustment of the guide plate in use.

FIG. 5 is a front view of the guide plate of the present invention.

FIG. 6 is a horizontal cross-sectional view of the guide plate of the present invention.

FIG. 7 is a vertical cross-sectional view of the guide plate of the present invention.

The marks in the figure are 100-guide plate, 200-tube blank, 300-roller, OH-guide plate arc surface circle center position, OR-pass rolling center line position, Le-guide plate arc surface circle center relative rolling center line eccentricity, and Rcc-guide plate aperture throat arc surface radius.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, the following description of the present invention sets forth certain specific details for a better understanding of the invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.

A guide plate design method for a two-roll cross-rolling piercer comprises the following steps: the traditional method designs a pass structure as shown in fig. 1, and as the roller is worn and re-turned during use, the guide plate needs to make the direction adjustment shown in fig. 2 to keep the pass closed. The deformed steel pipe similar to an ellipse in the deformation area rubs with the guide plate in the rotating process, and the rotating resistance of the steel pipe is reacted by the arc surface of the guide plate on one side of the deformed steel pipe separated from the guide plate. The improvement of the guide plate made by the design method of the invention solves the problem, and is shown in fig. 3 and 4. The invention avoids the rotation resistance of the tube blank at the top point of the ellipse-like long shaft when the tube blank rotates to separate from the contact surface of the guide plate, thereby obviously reducing the energy consumption of piercing rolling deformation and reducing the rolling load.

Example (b): in the production of barrel roll oblique rolling perforation machine set, 210 x 12mm of capillary tube is actually produced and pierced by tube blank with the diameter of 180mm in a certain factory. The nominal diameter of a roller is 720mm, the length of a roller body is 590mm, the inlet angle is 3 degrees, the outlet angle is 3.5 degrees, the feeding angle is 6 degrees, and the diameter of a top head is 174 mm.

And under the condition that the piercing-rolling deformation specification, the specifications of the roller and the top and the production working condition are not changed, only the improved guide plate is replaced to carry out production practice. The motor ammeter data during the on-site stable piercing-rolling is taken as an index for considering energy consumption, the average current during piercing-rolling of every hundred steel pipes before the guide plate is put into the design method is about 75A, the average current during piercing-rolling of every hundred steel pipes after the guide plate designed by the invention is applied is about 63A, the deformation load is reduced by about 16%, and the energy conservation is remarkable.

Claims

1. A guide plate design method for realizing low-energy-consumption rolling of a two-roller cross rolling puncher is characterized in that on a working surface of the guide plate in frictional contact with a steel pipe, a projection line of a rolling central line on the guide plate surface is taken as a boundary line, one side guide plate surface of a pipe body rotating into the guide plate surface is an arc surface, and one side guide plate surface of the pipe body rotating away from the guide plate surface is taken as a plane;

the side guide plate face of the pipe body rotating and leaving the guide plate face is parallel to the opposite face of the guide plate and the steel pipe friction contact working face, and the side guide plate face of the pipe body rotating and entering the guide plate face is not parallel to the opposite face of the guide plate and the steel pipe friction contact working face.

2. The method for designing the guide plate for realizing low-energy-consumption rolling of the two-roll cross rolling piercer according to claim 1 is characterized in that the center of a circular arc surface of the guide plate is located at an eccentric distance relative to a rolling central line, and the value Le of the eccentric distance is (0-0.2) of the diameter value of a pipe blank.