CN103191922A

CN103191922A - Four-roll sizing and reducing mill

Info

Publication number: CN103191922A
Application number: CN2013101147348A
Authority: CN
Inventors: 王建辉; 王锐; 穆东; 陈碧楠; 钟剑雄; 董海波
Original assignee: CISDI Engineering Co Ltd
Current assignee: CISDI Engineering Co Ltd
Priority date: 2013-04-03
Filing date: 2013-04-03
Publication date: 2013-07-10

Abstract

The invention discloses a novel four-roll sizing and reducing mill. Four groups of identical and replaceable roll assemblies which are installed in roll racks are arranged at 90-degree angles and driven by a motor through a speed reducer respectively. Roll shafts in the roll racks incline at certain degrees, such as 22.5 degrees, relative to the horizontal or vertical plane, simultaneously, adjacent racks can mutually turn over for 180 degrees, namely, the i rack can be used as the i+1 rack after being rotated at 180 degrees around the rolling axis horizontally or vertically. Roll gaps of adjacent racks right coincide or approximately coincide with roll bottoms, the rolling efficiency and the closure of hole patterns are greatly improved, and the product accuracy is high.

Description

The four-roller type size-reducing mill

Technical field

The invention belongs to the roll seamless steel tube technical field, particularly a kind of four-roller type size-reducing mill.

Background technology

Size-reducing mill is the finish rolling equipment in the seamless steel tube production chain, is to enlarge range of product size, improves a kind of desirable production equipment of pipe mill output and assurance end product quality.In seamless steel tube production chain, decide the tube reducing process and be the hollow body continuous rolling process of cored bar not is used for carrying out the hollow forging of course of hot rolling further rolling.Purpose is under the condition of less total reducing rate and little single chassis reducing rate, steel pipe is rolled into the finished product with requirement dimensional accuracy and ovality.

Through years of development, the three-roller type size-reducing mill has replaced dual roll type becomes at present most popular type in the world, and its equipment and technology be comparative maturity all.But because three-roller type size-reducing mill pass and rolling with (stock) tension, defectives such as six sides, wall unevenness in product occurs easily particularly more are easy to generate during rolling thick-walled pipe.

In recent years, also occur the patent of four-roller type size-reducing mill, as patent CN 101032724A a kind of seamless pipe four-roller type hot sizing stand has just been proposed, it adopts two drive rolls in a frame, two driven vollers, and drive roll is wideer than driven voller, drive roll is big covering of the fan roller, the pass cornerite is 120 °, and driven voller is little covering of the fan roller, and the pass cornerite is 60 °.The arrangement employing main transmission of frame is flat, grade separation replaces the kind of drive.This kind of drive is feasible for the very little sizing mill of tension force, but bigger opening subtracts machine for tension force, does not have the driven voller of power can cause tension force foundation difficulty, and the tension force destabilizing factor increases, thereby can cause that the wall unevenness phenomenon increases the weight of.In addition, differ 60 ° at the bottom of the roll gap of adjacent frame and the roller, can cause metal to increase at the mobile non-uniform phenomenon of section, the wall unevenness phenomenon also can be aggravated.In addition, principal and subordinate's action roller can not exchange use, has increased spare part quantity.

Summary of the invention

In view of this, the purpose of this invention is to provide a kind of novel four-roller type size-reducing mill, overcome the defective of above-mentioned prior art, improved rolling rule circle efficient and product precision greatly.

The objective of the invention is to be achieved through the following technical solutions:

A kind of four-roller type size-reducing mill, comprise at least 2 roll stands, described roll stand is arranged in order along institute's steel rolling pipe, and described roll stand comprises 4 rolls, roll on the described roll stand is drive roll, and namely the roll on the described roll stand is by motor-driven;

Further, the roll in the same roll stand is identical, and described roll pass cornerite is 90 ° and is distributed on the roll stand;

Further, described adjacent roll stand is 180 ° of layouts of mutual upset;

Further, described roll separate transmission and being obliquely installed.

The invention has the beneficial effects as follows: the present invention has the following advantages compared with prior art: 1) at the bottom of the adjacent breast roll and roll gap overlaps or approximate the coincidence, pass is round, has improved rolling rule circle efficient, has improved energy utilization rate; 2) four rolls can exchange use, and adjacent frame also rotatable 180 ° of exchanges is used, and has reduced spare part kind and quantity; 3) four roller diameters and width are identical, and the pass cornerite is 90 ° (three rollers are 120 °), and therefore, roller gap and roller bottom speed difference are littler when rolling, cause the slippage of steel pipe also littler, thereby have reduced the wearing and tearing of roll, have increased service life; 4) because four rolls are drive roll, make circumferential distortion more even, average wall thickness and inner polygon degree are also obviously improved, and be particularly evident during especially rolling thick-walled pipe; 5) the single chassis reducing rate is bigger.

Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being apparent to those skilled in the art to investigating hereinafter, perhaps can obtain instruction from the practice of the present invention.Target of the present invention and other advantages can realize and obtain by following specification.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:

Fig. 1 is roll stand schematic diagram of the present invention;

Fig. 2 is the roll arrangement mode schematic diagram in the frame order row;

Fig. 3 cuts open schematic diagram for A-A among Fig. 2;

Fig. 4 cuts open schematic diagram for B-B among Fig. 2;

Fig. 5 cuts open schematic diagram for C-C among Fig. 2;

Wherein, Fig. 2-Fig. 5 represents the mode of roll interlaced arrangement.

The specific embodiment

Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment only for the present invention is described, rather than in order to limit protection scope of the present invention.

As shown in the figure, a kind of four-roller type size-reducing mill comprises at least 2 roll stands, described roll stand is arranged in order along institute's steel rolling pipe 2, described roll stand comprises 4 rolls 1, and the roll 2 on the described roll stand is drive roll, and namely the roll on the described roll stand is by motor-driven; Because four rolls are drive roll, make circumferential distortion more even, average wall thickness and inner polygon degree are also obviously improved, and particularly evident during especially rolling thick-walled pipe, the single chassis reducing rate is bigger.

In the present embodiment, four roller diameters and width in the same roll stand are identical, and the pass cornerite is 90 °, therefore, roller gap and roller bottom speed difference are littler when rolling, cause the slippage of steel pipe also littler, thereby reduced the wearing and tearing of roll, increased service life.

In the present embodiment, described adjacent roll stand is 180 ° of layouts of mutual upset, described roll separate transmission and being obliquely installed; Four rolls can exchange use, and adjacent frame also rotatable 180 ° of exchanges is used, and has reduced among spare part kind and the volume cost embodiment.

Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of the technical program, it all should be encompassed in the middle of the claim scope of the present invention.

Claims

1. four-roller type size-reducing mill, comprise at least 2 roll stands, described roll stand is arranged in order along institute's steel rolling pipe, and described roll stand comprises 4 rolls, it is characterized in that: the roll on the described roll stand is drive roll, and namely the roll on the described roll stand is by motor-driven.

2. four-roller type size-reducing mill according to claim 1, it is characterized in that: the roll in the same roll stand is identical, and described roll pass cornerite is 90 ° and is distributed on the roll stand.

3. four-roller type size-reducing mill according to claim 1, it is characterized in that: described adjacent roll stand is 180 ° of layouts of mutual upset.

4. according to any described four-roller type size-reducing mill of claim 1-3, it is characterized in that: described roll separate transmission and being obliquely installed.