CN1546247A

CN1546247A - Process for rolling large-scale rails into miniature type rails and rollers therefor

Info

Publication number: CN1546247A
Application number: CNA2003101106861A
Authority: CN
Inventors: 周燕雄; 周燕芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-12-17
Filing date: 2003-12-17
Publication date: 2004-11-17

Abstract

The invention is a method and a roll for rolling the large-sized rail into small-sized rail. The roll: each group of passes includes a pass whose symmetrical line and the rolling line are vertical and a pass whose symmetrical line and the rolling line are concurrent, each group of passes decreases with the pass size, each group of passes corresponds to a kind of rail; the pass whose symmetrical line and the rolling line are vertical, the shape of roll slot on the two rolls match with the head part and the leg part of the rail; the pass whose symmetrical line and rolling line are concurrent, the slots on two rolls are distributed symmetrically to the rolling line. The method: using above mentioned roller, the large-sized steel rail is rolled with pass whose size is decreased gradually, the two kinds of passes are used alternately, and thus the small-sized steel rail is produced. The method is simple, the cost is low.

Description

Large-sized steel rail is rolled into the method and the roll thereof of ting model rail

Affiliated technical field

The present invention relates to a kind of method and roll thereof that large-sized steel rail is rolled into the ting model rail

Background technology

By the rolling small-sized steel rail of waste and old steel rail, two kinds of methods are arranged.The one, waste and old steel rail is smelted into steel ingot, again Rolling from Ingot is made light rail.This method step is many, be through twice heating and twice cooling, and energy-output ratio is big, and production efficiency is low, has increased oxidization burning loss, and metallographic structure changes easily and makes the quality of product can not get guaranteeing.The 2nd, after the heating of waste and old heavy rail process reverberatory furnace, directly be rolled into light rail.Disclosing a kind of patent No. as China's patent documentation is " technology for rerolling light rail from waste heavy rail " application for a patent for invention of 98106563.5, the technical scheme of this application for a patent for invention is: rail shape pass on roll, the lumbar curve of rail shape pass becomes 5-20 ° of angle with roll line, the angle of leg and lumbar curve is 105-90 °.Each pass on the roll is the design of inhomogeneous deformation relation, and the pass width is narrowed down gradually by wide, and useless heavy rail makes the rail height of useless heavy rail reduce according to passage in that laterally pier is thick in the operation of rolling.This technology belongs to flat oblique roll process, has shortcoming:

1, for the milling train of processing 60 kilograms/meter waste and old steel rail, its roll shaft centre-to-centre spacing is greater than 600 millimeters, and power of motor reaches 1200 kilowatts.The milling train volume is big, and power consumption is big.

2, all adopt flat inclined hole type, the axis of symmetry of pass becomes 5-20 ° of angle with roll line, and the pass design is complicated, and pass is relatively large in the shared size of rolling surface, has reduced the effective dimensions of rolling surface.

3, all the size than pass is little along the size of axial size of symmetry and vertical symmetry direction of principal axis for rolled piece, has therefore increased the difficulty that rolled piece enters the pass groove, has also increased the rate of wear of pass.

4, rail shape section is asymmetric to the vertical axis left and right sides, can produce bigger axial force when rolling, causes the roll axial float, makes the thick or thick variation of open groove leg, and it is complicated to increase for operation.Because when rolling, the inclined working wearing and tearing are very fast, so will pay special attention to the axial restraint to up-down rollers.Facts have proved and to adopt the way that adds thrust ring to solve the axial force problem.But adopt thrust ring to cause that again roll length increases, roller directly increases, and has further increased the problems such as complexity of roll structure, as Fig. 1.And utilize the thick waist of axial force pier of thrust ring, mechanical condition and technical conditions are difficult to realize in the practice of prior art.

6, in the operation of rolling, even adopted thrust ring, can not offset axial force fully, the rate of wear of bearing, bearing shell is accelerated, and has increased rolling cost.

7, rolled piece skewness in pass makes that the groove that is distributed on the roll is deep mixed, and PASS DESIGN is had higher requirement.The increase of the groove degree of depth has also increased the difficulty of the rolled piece demoulding.

8, be not easy to realize the operation of automatic assembly line formula.

Summary of the invention

The object of the present invention is to provide a kind of method and roll thereof that large-sized steel rail is rolled into the ting model rail.Described milling method technology is simple, can realize automated production, and production cost is low.Adopt described roll large-sized steel rail can be rolled into the ting model rail easily.

In order to achieve the above object, technical scheme of the present invention is following design:

A kind of roll that large-sized steel rail is rolled into the ting model rail, the pass that matches with the track shape of cross section that a group or more is arranged on roll, it is characterized in that: every group of pass comprises a line of symmetry and vertical pass and the pass that line of symmetry overlaps with roll line of roll line, each is organized pass and successively decreases the rail of every group of corresponding a kind of model of pass according to the passage size; The pass that line of symmetry is vertical with roll line, the shape of the groove on two rolls match with the head and the shape of leg of rail respectively, and groove is positioned at the width dimensions of the width dimensions at roll line position greater than other positions; The pass that line of symmetry overlaps with roll line, the groove on two rolls is symmetrically distributed with respect to roll line.

A kind of large-sized steel rail is rolled into the roll of ting model rail, it is characterized in that: the pass that line of symmetry is vertical with roll line, the groove on two rolls is respectively trapezium structure.

A kind of large-sized steel rail is rolled into the method for ting model rail, it is characterized in that:

Adopt following milling train:

The pass that matches with the track shape of cross section that a group or more is arranged on the roll of this milling train, every group of pass comprises a line of symmetry and vertical pass and the pass that line of symmetry overlaps with roll line of roll line, each is organized pass and successively decreases the rail of every group of corresponding a kind of model of pass according to the passage size; The pass that line of symmetry is vertical with roll line, the shape of the groove on two rolls match with the head and the shape of leg of rail respectively, and groove is positioned at the width dimensions of the width dimensions at roll line position greater than other positions; The pass that line of symmetry overlaps with roll line, the groove on two rolls is symmetrically distributed with respect to roll line;

Adopt following step:

Large-sized steel rail is rolling successively with the pass that size reduces gradually, and the pass of the vertical roll line of line of symmetry is used alternatingly with the pass of parallel roll line,

And the method for the ting model rail of the model that obtains meeting the requirements.

A kind of method and roll thereof that utilizes the useless rolling light rail of heavy rail of the present invention.Both be fit to the horizontally-arranged machine, be fit to tandem mill again, also be fit to manual bar milk.Both be fit to automated production, be fit to handwork again.

1, for the milling train of processing 60 kilograms/meter waste and old steel rail, its roll shaft centre-to-centre spacing is greater than 350 millimeters, and power of motor is lower than 380 kilowatts.Equipment is little, and operating cost is low.Compare with the oblique flat hole milling train of same model, power of motor reduces about 1/3.

2, the line of symmetry pass vertical with roll line, its effect are to make the waist pier of rail thick, highly diminish.When rolling, its active force is identical with the waist deformation direction of rail, and the effective power height can reach 100% in theory; Because rail along its axis left-right symmetry, can not produce axial force when therefore rolling, can not produce axial float again yet.The pass that line of symmetry overlaps with roll line, its effect are that the width of rail is diminished, and moulding is extended, the vertical roll line of its active force, and no axial force can not produce axial float yet.Therefore cancel thrust ring, increased the service life of consumable accessorys such as bearing, bearing shell.

3, because pass of the present invention has been eliminated axial force, avoided axial float, more traditional roll has been cancelled thrust ring, and the structure of roll is become simply, and handling ease has increased the effective length of rolling surface.In addition, the partial-length of the rolling surface that pass takies reduces, and has increased the service efficiency of rolling surface.

4, always less than the size of corresponding pass, the groove of its pass is positioned at the width dimensions of the width dimensions at roll line position greater than other positions to rolled piece along the size of rolling surface direction, and therefore, it is easy that rolled piece is gone into groove, and it is also easy to take off groove, is convenient to realize automated production.

Description of drawings

Fig. 1 is flat inclined hole type roll structural representation,

Fig. 2 is employing pass three-high mill structural representation of the present invention,

Fig. 3 is the line of symmetry of the present invention pass figure vertical with roll line,

Fig. 4 is the pass figure that line of symmetry of the present invention overlaps with roll line.

The pass of the flat inclined hole type of 1-, 2-roll, the vertical roll line of 3-line of symmetry, the pass of the parallel roll line of 4-line of symmetry, 5-rolled piece, 6-thrust ring, 7-roll line among the figure

The specific embodiment

The useless heavy rail of 60kg/m is processed into the method for the positive material rail of 12kg/m, shown in Fig. 1-4.

Design 6 groups of passes and be respectively 50kg, 43kg, 30kg, 24kg, 18kg, 12kg rail pass.Every group of pass comprises a line of symmetry and roll line 7 vertical pass 3 and the pass 4 that line of symmetry overlaps with roll line, and each is organized pass and successively decreases the rail of every group of corresponding a kind of model of pass according to the passage size.The pass 3 that line of symmetry and roll line 7 are vertical, the shape of the groove on two rolls 2 match with the head and the shape of leg of rail respectively.The pass 4 that line of symmetry overlaps with roll line, the groove on two rolls 2 is symmetrically distributed with respect to roll line 7.The useless heavy rail of 60kg/m is cut into the 1.25m/ root, be heated to 900-1000 ℃ through reverberatory furnace.Use the groove rolling vertical with roll line of 50kg line of symmetry rapidly with burning red rail, then the groove rolling that overlaps with roll line with the 50kg line of symmetry obtains the rail of 50kg.Then, use the groove rolling of 43kg rail, 30kg rail, 24kg rail, 18kg rail, 12kg rail respectively, obtain the positive material of rail of 12kg at last.As using 60kg steel rail rolling 50kg rail, then with one group of rolling rail that just can obtain 50kg of 50kg rail pass.In the foregoing description, be to adopt the line of symmetry pass vertical earlier rolling with roll line, two kinds of pass tandem rollings successively then, in the middle of practical application, also can be earlier rolling with parallel pass.For making rolled piece conveniently enter groove, the width dimensions of pass should be designed more than the big 1mm of width dimensions than rolled piece.

Claims

1, a kind of roll that large-sized steel rail is rolled into the ting model rail, the pass that matches with the track shape of cross section that a group or more is arranged on roll (2), it is characterized in that: every group of pass comprises a line of symmetry and vertical pass (3) and the pass (4) that line of symmetry overlaps with roll line of roll line, each is organized pass and successively decreases the rail of every group of corresponding a kind of model of pass according to the passage size; The pass that line of symmetry is vertical with roll line (3), the shape of the groove on two rolls (2) match with the head and the shape of leg of rail respectively, and groove is positioned at the width dimensions of the width dimensions at roll line position greater than other positions; The pass that line of symmetry overlaps with roll line (4), the groove on two rolls (2) is symmetrically distributed with respect to roll line.

2, according to claim 1ly a kind of large-sized steel rail is rolled into the roll of ting model rail, it is characterized in that: the groove of the pass that line of symmetry is vertical with roll line (3) on two rolls (2) is respectively trapezium structure.

3, a kind of large-sized steel rail is rolled into the method for ting model rail, it is characterized in that:

Adopt following milling train:

The pass that matches with the track shape of cross section that a group or more is arranged on the roll (2) of this milling train, every group of pass comprises a line of symmetry and vertical pass (3) and the pass (4) that line of symmetry overlaps with roll line of roll line, each is organized pass and successively decreases the rail of every group of corresponding a kind of model of pass according to the passage size; The shape of the groove of the pass that line of symmetry is vertical with roll line (3) on two rolls (5) matches with the head and the shape of leg of rail respectively, and groove is positioned at the width dimensions of the width dimensions at roll line position greater than other positions; The groove of the pass that line of symmetry overlaps with roll line (4) on two rolls is symmetrically distributed with respect to roll line;

Adopt following step: