CN1206633A

CN1206633A - Method for hot-rolling shaped sectional steel of expansion joint

Info

Publication number: CN1206633A
Application number: CN 97115056
Authority: CN
Inventors: 陈工
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-07-30
Filing date: 1997-07-30
Publication date: 1999-02-03
Anticipated expiration: 2017-07-30
Also published as: CN1060974C

Abstract

The present invention relates to a method for manufacturing expansion device special-shaped steel section used in building and bridge. It changes the conventional inward-bending leg-folding manufacturing process, and is characterized by that its pass schedule is formed from two different pass processes; said invention uses two rolling passes to form inward-bent folded leg. Its first pass is hot-rolling process which is used for processing inside and outside forms and sizes of special-shaped steel section inward-bent folded leg to make the outside surface of folded leg and top surface of the special-shaped steel form an obtuse angle, and another pass is hot-bending and hot-rolling combined rolling process for stereotyping the product.

Description

Method for hot-rolling shaped sectional steel of expansion joint

The present invention relates to metal rolled field, particularly a kind of finish rolling moulding process of hot-rolling shaped sectional steel of expansion joint inner bending leg.

Retractor device is a building, particularly a large amount of constructional devices that use in the bridge construction.The production method of the critical piece deformed steel in this device is mainly extrusion, the rolling special-shaped base Combination Welding method of split at present, and these method production efficiencys are low, production cost is high.To this, the inventor has proposed the rolling special-shaped base one hot bending rolling of a kind of integral body in Chinese utility model patent 94244563.5, its method is that the pre-bending inclined-plane of the hole slot radially offered by roll forces the inner bending leg outer side flexural deformation of special-shaped blank and reaches the shape of necessary requirement in the operation of rolling.But in the whole hot bending operation of rolling, this folding inboard leg does not contact with roll all the time, its inboard shape relies on the directed flow of thermoplasticity state lower stress metal fully and forms naturally, because the flow direction of thermoplasticity metal is subjected to temperature, deformation velocity and is subjected to the influence of force direction, therefore when producing in enormous quantities, be difficult to guarantee the shape and the dimensional tolerance of folding leg, yield rate is not high.

The purpose of this invention is to provide that a kind of production efficiency height, production cost are low, the pass and the roll of operation simple installation, hot-rolling shaped sectional steel of expansion joint inner bending leg that yield rate is high.Wherein hot rolling process is made of hot rolling and hot bending process.

The present invention is achieved in that the section roll pass is made up of the hole slot on two rolls up and down, and the pass schedule of hot-rolling shaped sectional steel of expansion joint inner bending leg is made up of the pass and the roll of two kinds of different process.One of them pass belongs to hot rolling technology, specially play outer shape and size in this deformed steel inner bending leg of processing, this pass is the configuration of angular rolling pass, be designed to the part and have the geomery of deformed steel finished product inner bending leg, and making this folding leg outer side face and deformed steel end face form the obtuse angle, other position of pass is designed to approximate finished form.Another pass belongs to hot bending, hot rolling combination rolling mill practice, plays the effect of typing finished product.This pass adopts the configuration of oblique milling pass, is designed to the profile and the size of deformed steel finished product.Specifically: promptly in same pass, at first adopt the hot bending rolling mill practice, the inner bending leg outer side that forms the obtuse angle with the deformed steel end face is bent into finished form, then, adopt the working special-shaped steel profile of hot rolling technology shaping and be of a size of finished product in exit, rolling deformation district.Like this, through twice rolling can with special-shaped blank rolling be finished product.

The present invention compares with the existing shaped sectional steel of expansion joint technology of producing, and has fundamentally changed traditional production method, so operation in the operation of rolling, installs simply, and constant product quality, cost are low, lumber recovery obviously improves.

The present invention is described in detail bright below in conjunction with accompanying drawing

Fig. 1 is the concave roll schematic diagram of the present invention's employing hot rolling technology, wherein: 1, the topping roll of the bottom roll groove face 5 of the bottom roll groove face 4 of topping roll 2, bottom roll 3, working special-shaped steel end face, working special-shaped steel inner bending leg outer side, working special-shaped steel inner bending inboard leg projection groove face.

Fig. 2 is the present invention's employing hot bending, the pass and the roll schematic diagram of hot rolling combination rolling mill practice, wherein: 6, the topping roll groove face of the bottom roll groove face 10 of the bottom roll groove face 9 of topping roll 7, bottom roll 8, working special-shaped steel end face, working special-shaped steel inner bending leg outer side, processing inner bending leg finished product lateral surface

The drawing explanation of Fig. 1, Fig. 2: the top and bottom rolls that is respectively two passes 1,2 of Fig. 1, Fig. 2 signal and 6,7 is along the intercepting of axle center level, and H1, H2 are pass heights, and B1, B2 are the pass width, and W is the width of topping roll 1 projection among Fig. 1.As seen from Figure 1: the bottom roll groove face 4 of the bottom roll groove face of working special-shaped steel end face 3 and working special-shaped steel inner bending leg outer side in obtuse angle, and this pass is the configuration of angular rolling pass.As seen from Figure 2: the bottom roll groove face 8 of working special-shaped steel end face is rectangular with the bottom roll groove face 9 of working special-shaped steel inner bending leg outer side.This pass is the configuration of oblique milling pass.

Fig. 3 is that wherein: 11, shaped sectional steel of expansion joint inner bending leg 12, deformed steel end face, A shown in the drawing is the finished product width of rebate through the schematic diagram of one of rolling shaped sectional steel of expansion joint product of pass of the present invention and roll

Fig. 4 is a blank section configuration schematic diagram.

It is that 900 ℃ special-shaped blank is a raw material that the present invention adopts temperature, and this abnormal shape blank is the flat shape except that inner bending leg and deformed steel end face 12, and other profile has shape outside the deformed steel finished product, only the size difference.This blank can directly be transported to finish rolling operation pass and roll of the present invention and be rolled rolling the finishing of blooming mill group job line (the rolling of this stock is common rolling technique, not within the present invention).The flat shape of inner bending leg at right angles reaches the finished product requirement through the outside behind first pass in obtuse angle through the outside behind second pass.

The computational methods of blank and each pass: the present invention adopts two duo mills, rolling pass of every rolling mill design.Here adopting the difference in height between each pass is Δ H=0.5～1MM (Δ H is a difference in height), H1=H2+0.5MM, H0=H1+0.5MM (HO is a sotck thinkness).

Because the difference in height of each road pass is very little, only is 0.5MM, so can not consider absolute spread, makes Δ B=0 (△ B is an absolute spread), that is: B0=B1=B2 (B0 is special-shaped blank width).

Each pass configuration mode and method: the present invention's hot rolling technology pass (as shown in Figure 1) is the configuration of angular rolling pass, the arrangement angles of this pass (the following angle that rolls rod groove face 3 and roll mandrel edema with the heart involved horizontal line of working special-shaped steel end face) should be according to the projection thickness W (size of W is required by roll strength and deformed steel finished product (shown in Figure 3) width of rebate A takes all factors into consideration definite) of topping roll 1, the height H 1 of this pass, pass width B 1 and make this angle be principle to the maximum as far as possible to choose, can determine by graphing method.The present invention's hot bending, hot rolling combination rolling mill practice pass (as shown in Figure 2) are the configuration of oblique milling pass, and gradient is chosen routinely, and getting gradient here is 5～10%.

Claims

1, a kind of manufacture method of shaped sectional steel of expansion joint is characterized in that: the inner bending leg is a heat rolling-forming.

2, hot rolling system inner bending leg according to claim 1, it is characterized in that: the pass schedule of hot rolling system is made up of the pass and the roll of two kinds of different process, first pass belongs to hot rolling technology, groove is the configuration of angular rolling pass, (5) of topping roll and (3) of bottom roll, (4) be used for the interior outer shape of rolling inner bending leg, make lateral surface and deformed steel end face be split into the obtuse angle, wherein (4), (5) also be used for rolling inner bending leg and have the size of finished product, other positions of pass and finished product are approximate, second pass belongs to hot bending, hot rolling combination rolling mill practice, pass adopts the configuration of oblique milling pass, (10) of topping roll and (8) of bottom roll, (9) make the outside beginning and the size of inner bending leg fully identical with finished product.

3, hot rolling system inner bending leg according to claim 1, it is characterized in that: there is groove the centre of the used stock of hot rolling system, and groove shape and finished product groove are approximate, and leg to be bent leaves depreciated amount to be curved.