CN102215989B

CN102215989B - Process for producing t-bar steel and series of rolling devices

Info

Publication number: CN102215989B
Application number: CN2009801454102A
Authority: CN
Inventors: 高岛由纪雄; 山口阳一郎; 高桥英树
Original assignee: NKK Corp
Current assignee: JFE Steel Corp; JFE Engineering Corp
Priority date: 2008-11-20
Filing date: 2009-11-19
Publication date: 2013-10-23
Anticipated expiration: 2029-11-19
Also published as: JP4544371B2; WO2010058861A1; KR20110028553A; JP2010149181A; CN102215989A; KR101043564B1

Abstract

A process for producing T-bar steel which includes an intermediate rolling step, in which the web and flange of a T-shaped steel bar roughly formed into a T shape are rolled, and a finishing step, in which the T-shaped steel bar obtained in the intermediate rolling step is finish-rolled into the shape of a product. The intermediate rolling step comprises: a rolling step using a first universal roughing mill, wherein upper and lower horizontal rolls reduce the entire upper and lower surfaces of the web in the thickness direction; an edger rolling step in which the edge faces of the flange are reduced; and a rolling step using a second universal roughing mill, wherein upper and lower horizontal rolls, each having a roll surface that is the same width as the intended inner height of the web and also having a corner which is located on the web-tip side and has been processed into a shape that does not roll the web surface, are used to reduce the upper and lower sides of the web in the thickness direction, excluding an area near the tip. Simultaneously with this rolling, one of right and left vertical rolls is used to reduce the edge face of the web in the height direction of the web, while keeping the periphery of the vertical roll in contact with the horizontal rolls, while the other vertical roll is used to reduce the flange in the thickness direction thereof.

Description

The manufacture method of T-steel and rolling equipment group

Technical field

The present invention relates to manufacture method and the rolling equipment group of the T-steel (T-bar) by hot rolling.

Background technology

The cross sectional shape of T-steel has been shown among Figure 12.T-steel 10 is that the cross section that is formed by web (web) 11 and the edge of a wing (flange) 12 is the shaped steel of T word shape, uses widely in fields such as shipbuilding, bridges.T-steel is fabricated to the finished product of various sizes according to its purposes, service condition, use location etc.

Normally used T-steel is of a size of web height: about 200～1000mm, web thickness: about 8～25mm, web inside dimensions (inner height of web): about 190～980mm, flange width: about 80～300mm, the thickness of the edge of a wing: about 12～40mm.And for the T-steel of shipbuilding, web height mostly is greatly more than 2 times of flange width.

In addition, even web height and flange width are about equally, also as required intensity is selected the T-steel of the web thickness a plurality of sizes different with edge of a wing thickness, is applied to structure.As shown in figure 13, sometimes use side dimension (the outer height of web) Ao(of inside dimensions Ai with the web of web identical with web height among Figure 12) as the benchmark of web height, even it is constant that the situation that change in size web inside dimensions Ai is also equated calls the web inboard, it is constant that the situation that web outside size Ao is equated is called web outside.When constant in the web inboard, shown in Figure 13 (a), if edge of a wing thickness t f is changed to tf1, tf2, tf3, then because Ai is constant, Ao is changed to Ao1, Ao2, Ao3.In addition, when web outside was constant, shown in Figure 13 (b), if edge of a wing thickness t f is changed to tf1, tf2, tf3, then because Ao is constant, Ai was changed to Ai1, Ai2, Ai3.When size for connection is different in the longitudinal direction T-steel, in the situation that web is inboard constant, the inner surface on the edge of a wing (face of web side) is in equal height, and the outer surface on the edge of a wing produces step.On the contrary, in the situation that web outside is constant, when connecting in the longitudinal direction, the outer surface on the edge of a wing produces step in the height that equates at inner surface.Use the T-steel of which kind of type, select from the angle of application property according to purposes with the position.

T-steel is generally with 12 welding of web 11 and the edge of a wing and manufacture, but also proposed the technology that goes out T-steel by rolling and integrally formed.For example, for high efficiency manufacture web thickness, edge of a wing thickness, web height and flange width are the T-steel of various sizes, proposed in roll the equipment of hot rolling (for example patent documentation 1) that has respectively configured a universal rolling machine (universal mill) in operation and the finish rolling operation.

Figure 14 shows the one example, has: thick moulding roll mill 1, and it is rolling blank steel billet of taking out of from heating furnace (not shown) back and forth, and the cross section dumming is T shape roughly; Thick universal rolling machine 2, it is used for will be that roughly the T-steel base (not shown) of T shape shape is configured as the roughly T-steel of finished size by this thick moulding roll mill 1 dumming; Edging mill (edger mill) 3 is arranged near the downstream of thick universal rolling machine 2 (Figure 14 (a)); With smart universal rolling machine 5.The rolling process that is undertaken by thick universal rolling machine 2 and edging mill 3 rolls operation in being, the rolling process that is undertaken by smart universal rolling machine 5 is the finish rolling operation.

In Figure 14 (b), schematically show the structure of thick universal rolling machine 2, in Figure 14 (c), schematically show the structure of edging mill 3, in Figure 14 (d), schematically show the structure of smart universal rolling machine 5.Thick universal rolling machine 2 has horizontal roll (horizontal roll) 21a, 21b and perpendicular roll (vertical roll) 22a, 22b, in addition, essence universal rolling machine 5 has

horizontal roll

51a, 51b and

perpendicular roll

52a, 52b, by adjusting mill opening (roll gap) separately, even do not change roll, also billet rolling can be become the finished product of various edges of a wing thickness, web thickness.Edging mill 3 has

edger roll

31a, 31b, and they are made of large-diameter portion 33 and minor diameter part 32, utilizes minor diameter part 32 to depress the end face on the edge of a wing 12, thereby can adjust flange width.

The method of using the thick roll mill of 3 axles and 3 axle edging mill high efficiency manufacture T-steels is disclosed in patent documentation 2.In this technology, after roughing system, depress simultaneously the end face 11a of web 11 and the end face 12a on the edge of a wing 12 by 3 axle edging mills shown in Figure 15, also the height of web 11 is adjusted.

And, the manufacture method of the hot roll T shaped steel with following feature is disclosed in patent documentation 3, namely, the thick shaped blooms of T-steel is carried out reciprocal when rolling at least 2 universal rolling machines by arranged in series, shown in Figure 16 (a) and Figure 16 (b), depress web and the edge of a wing of this thick shaped blooms to thickness direction by a universal rolling machine UR, the edge of a wing of depressing described thick shaped blooms to width by another universal rolling machine UF, perhaps, simultaneously depress the edge of a wing and depress web to short transverse to width, wherein, the thick shaped blooms of T-steel carries out roughing system to steel billet and is shaped to.

In addition, following technology is disclosed in patent documentation 3, namely, in carrying out, rolls the thick shaped blooms to T-steel and after T-steel carried out moulding, by carrying out finish rolling, make T-steel, wherein, the thick shaped blooms of T-steel carries out roughing system by thick roll mill BD to steel billet and is shaped to, roll in described for carrying out back and forth rolling by at least one thick universal rolling machine UR and at least one the double formula roll mill E that is adjacent configuration to this thick shaped blooms, depress the web thickness of this thick shaped blooms and edge of a wing thickness and the web height of this thick shaped blooms is adjusted by thick universal rolling machine, and depress the flange width of thick shaped blooms and depress the end thickness of web by double formula roll mill, described finish rolling is to described edge of a wing thickness by smart universal rolling machine UF, at least one size in described web thickness or the described web height is adjusted (Figure 17).

Patent documentation 1:JP examined patent publication 43-19671 communique;

Patent documentation 2:JP JP 57-4301 communique;

Patent documentation 3:JP JP 2007-331027 communique.

Summary of the invention

Utilize in the situation that rolling equipment shown in Figure 14 is rolled, in roll in the thick universal rolling machine 2 of operation, utilize

horizontal roll

21a, 21b to depress web 11 along the thickness of slab direction of the web 11 of T-steel base H, and the thickness of slab direction along the edge of a wing 12 of T-steel base (being rolled part) H between perpendicular roll 22a and

horizontal roll

21a, 21b is depressed the edge of a wing 12.The side of not depressing the perpendicular roll 22b of the edge of a wing 12 1 sides and

horizontal roll

21a, 21b joins and configures, when depressing the edge of a wing 12, the side of pressing

horizontal roll

21a, 21b in the mobile mode of

horizontal roll

21a, 21b by the axial power that acts on

horizontal roll

21a, 21b from perpendicular roll 22a.In addition, utilize near the edging mill 3 the downstream be arranged on thick universal rolling machine 2, depress the end face of width on the edge of a wing 12 of T-steel base H, adjust the width on the edge of a wing 12.In the finish rolling operation, by smart universal rolling machine 5, be shaped as the edge of a wing 12 vertical between

horizontal roll

51a, 51b and perpendicular roll 52a, the 52b, web is not depressed on its short transverse, thereby finishes the hot rolling of T-steel.

That is, in the situation of having used rolling equipment shown in Figure 14, in roll in the operation, use thick universal rolling machine 2 to adjust web thickness and edge of a wing thickness, and, depress edge of a wing end face by edging mill 3 and adjust flange width, but, do not use roll to depress web along the short transverse of web.Therefore, the height that produces web not necessarily forms the situation of target size, in addition, web leading section (the end face 11a of the web 11 among Figure 12) at cross sectional shape (perpendicular to the cross sectional shape of the length direction of finished product, below identical) upper form circular-arcly, be undesirable as finished form.Although also have the countermeasure that after hot rolling, by gas cutting, slitting shears etc. the leading section cut-out of web is formed finished product, but after hot rolling, append in this case the cut-out operation, thereby so that the manufacturing cost of T-steel increases, makes become during required long-term (producing delay at delivery date etc.).

In patent documentation 1, put down in writing following technology, namely, horizontal roll at smart universal rolling machine arranges cutting portion, shaping (Figure 21 of patent documentation 1 and Figure 22) is carried out in the end that cuts off web in the finish rolling operation, but because can produce overlap (bur), fillet (shear droop) in cutting portion, so can not obtain the good finished product of cross sectional shape.

Utilize the disclosed method of depressing simultaneously the end face 12a on the end face 11a of web 11 and the edge of a wing 12 by 3 axle edging mills in the patent documentation 2, also can adjust web height.But only the end face of web 11 is limited when edging.Therefore, in the large situation of web height, when making the T-steel of the little size of web thickness, if will strongly depress the web end face, then web 11 produces and buckles, and can not adjust accurately web height.Especially for being the shipbuilding T-steel of the size more than 2 times of flange width as web height, existing to be easy to produce and buckle and make the problem of the deterioration in accuracy of web height.

With respect to this, the milling method of patent documentation 3 records utilizes the perpendicular roll of the second universal rolling machine shown in Figure 16 (b) to depress web along short transverse, thereby the web front end is shaped and adjustment web height size.But although utilize this universal rolling machine to play the effect of depressing simultaneously flange width and web front end, the reduction in thickness on web and the edge of a wing is had to little of a few percent degree.This is because the step-like horizontal roll that has minor diameter part and large-diameter portion owing to use is depressed flange width, thereby need to use the perpendicular roll with minor diameter part in edge of a wing side, can not utilize this perpendicular roll to depress two ends, the edge of a wing, and produce step at edge of a wing thickness.In addition, by depressing flange width, the thickness of edge of a wing front end increases, thereby the step on the thickness of the edge of a wing is larger, produces the possibility that folds into the blemish such as defective (flaw) at edge of a wing outer surface high.And, although be provided with 2 universal rolling machines according to the above structural problem of the second universal rolling machine, in fact only depress thickness by a universal rolling machine, exist the pass number to become many problems.

In addition, in the universal rolling machine UF of Figure 16, the perpendicular roll of one side depress the edge of a wing and the rolling counter-force that produces act on horizontal roll axially, but because the perpendicular roll of web front not with the contacts side surfaces of horizontal roll, so can not be by the axial load of perpendicular roll support horizontal roll.That is, in the situation that will effectively depress edge of a wing thickness, because be difficult to the axial load of several thousand kNs of supporting role on horizontal roll, can not strengthen edge of a wing reduction ratio.

And, owing to thinking that the inclination angle on the edge of a wing in rolling in preferred (makes edge of a wing section in the situation of web level with respect to the inclination angle of vertical direction.Be equivalent to α-90 ° of Figure 11) be below 5 degree, thereby in the time will utilizing the second universal rolling machine effectively to depress edge of a wing thickness, the contact length of edge of a wing inner surface and horizontal roll side is elongated, also has the problem that is easy to produce at the edge of a wing inner surface defective because of the slip of roll and rolled parts.

On the other hand, in the thick universal rolling machine of use of putting down in writing in the patent documentation 3 shown in Figure 17 and another method of double formula roll mill, thick universal rolling machine is that one thereby pass number are many, wish that in addition making the angle on the edge of a wing is below above 5 degree of 0 degree, therefore exists the problem that is easy to produce at the edge of a wing inner face defective.

The present invention proposes in order to solve the above problems, its purpose is the manufacture method and the rolling equipment group that provide following, the shape that described manufacture method is used for making the web leading section well and obtain accurately the web height of expectation and is made T-steel with few pass number efficiently.

Problem of the present invention can realize by following means.

(1) a kind of manufacture method of T-steel comprises: in roll operation, be that web and the edge of a wing of the T-steel base of T shape shape is rolled to dumming; And finish rolling operation, carry out to form the finish rolling of finished form by the T-steel base that rolls the operation acquisition in described, it is characterized in that, rolling operation in described comprises: the rolling process that is undertaken by the first thick universal rolling machine, wherein, up and down horizontal roll is depressed whole of top and bottom on the thickness of slab direction of web; The flanging operation is depressed the end face on the edge of a wing; Reach the rolling process that is undertaken by the second thick universal rolling machine, wherein, the width of use roll outer peripheral face equates with target web inside dimensions and the bight of web leading section side is processed to the not horizontal roll up and down of the shape of rolling web surface, depress web near leading section the top and bottom of thickness of slab direction, and about perpendicular roll in the perpendicular roll of a side depress the edge of a wing along the thickness of slab direction on the edge of a wing, the perpendicular roll of opposite side make the outer peripheral face contact up and down horizontal roll and depress the end face of web along the short transverse of web.

(2) such as the manufacture method of above-mentioned (1) described T-steel, it is characterized in that, in the rolling process that is undertaken by the described second thick universal rolling machine, the outer peripheral face of the perpendicular roll of depressing the web end face is contacted with up and down horizontal roll and adjust aperture between the perpendicular roll of opposite side and the horizontal roll side up and down, make thus the constant and T-steel of a plurality of sizes that edge of a wing thickness is different of web inside dimensions.

(3) a kind of rolling equipment group of T-steel, T-steel base take dumming as T shape shape is as being rolled part, rolling this is rolled web and the edge of a wing of part, it is characterized in that, dispose following roll mill and consist of: the first thick universal rolling machine has the width of roll outer peripheral face greater than the described horizontal roll up and down that is rolled the target web inside dimensions of part; Edging mill is depressed the described end face that is rolled the edge of a wing of part; And the second thick universal rolling machine, have up and down horizontal roll and about perpendicular roll, in the described horizontal roll up and down, the width of roll outer peripheral face equates with the described target web inside dimensions that is rolled part, and the bight of web front is processed to the not shape of rolling web surface, in the perpendicular roll about described, the perpendicular roll of one side is depressed this edge of a wing along the thickness of slab direction on the edge of a wing, and the perpendicular roll of opposite side makes the outer peripheral face of this perpendicular roll contact with up and down horizontal roll and depresses the end face of web along the short transverse of web.

The invention effect

Manufacture method and rolling equipment group according to T-steel of the present invention, by following effect, can obtain just can make the shape of web leading section good and can obtain accurately effective manufacture method and the rolling equipment group of the T-steel of the web height expected by hot rolling, industrial extremely useful.

1. roll the web thickness of operation and depressing of edge of a wing thickness because utilize in this two sides enforcement of the first and second thick universal rolling machines, so compare with the situation of using a thick universal rolling machine rolling thickness, can increase the web thickness of per 1 pass and the drafts of edge of a wing thickness, thereby the minimizing pass improves rolling efficiency.In addition, by with many of at least any roll mill configurations in the first thick universal rolling machine, edging mill, the second thick universal rolling machine, can further improve rolling efficiency.

2. by the second thick universal rolling machine, the periphery of perpendicular roll is contacted with a side of not depressing edge of a wing thickness (web front) of horizontal roll, support the axial rolling counter-force that acts on horizontal roll that produces because depressing edge of a wing thickness, and depress the end face of web along short transverse, thereby can prevent moving axially of horizontal roll, and can the good T-steel of rolling dimensional accuracy.

3. because the bight of the web front of the employed horizontal roll of the second thick universal rolling machine is processed to the not shape of rolling web surface, so also can not form enation even depress the web front end, can obtain good web front end shape.

Description of drawings

Fig. 1 is the figure of an example of the configuration of the expression rolling equipment of implementing the T-steel that the present invention uses.

Fig. 2 is the figure that the structure of the first thick universal rolling machine of implementing the present invention's use is described, Fig. 2 (a) is the one example, and Fig. 2 (b) is the schematic diagram of other examples of explanation.

Fig. 3 is the schematic diagram of an example of the explanation structure of implementing the edging mill that the present invention uses.

Fig. 4 is the schematic diagram of an example of the explanation structure of implementing the second thick universal rolling machine that the present invention uses.

Fig. 5 is the schematic diagram of the another one example of the explanation structure of implementing the second thick universal rolling machine that the present invention uses.

Fig. 6 is the schematic diagram of another example of the explanation structure of implementing the second thick universal rolling machine that the present invention uses.

Fig. 7 is the schematic diagram of another example of the explanation structure of implementing the second thick universal rolling machine that the present invention uses.

Fig. 8 is the schematic diagram of another example of the explanation structure of implementing the second thick universal rolling machine that the present invention uses.

Fig. 9 is the schematic diagram of another example of the explanation structure of implementing the second thick universal rolling machine that the present invention uses.

Figure 10 is the schematic diagram of an example of the explanation structure of implementing the smart universal rolling machine that the present invention uses.

Figure 11 is that explanation is at the schematic diagram of the shape for lugs of rolled parts web front end generation.

Figure 12 is the cutaway view of the cross sectional shape of expression T-steel.

Figure 13 is the figure of the size shape of the inboard constant and T-steel that the outside is constant of expression, and Figure 13 (a) is the figure of the inboard constant T-steel of expression, and Figure 13 (b) is the figure of the constant T-steel in the expression outside.

Figure 14 is the figure that represents the rolling equipment of T-steel in the past, Figure 14 (a) is the allocation plan of roll mill, Figure 14 (b) is the figure of the structure of the thick universal rolling machine of explanation, and Figure 14 (c) is the figure of the structure of explanation edging mill, and Figure 14 (d) is the figure of the structure of the smart universal rolling machine of explanation.

Figure 15 is the figure of structure that represents the edging mill of T-steel in the past.

Figure 16 is the figure that represents the structure of the universal rolling machine in the milling method of T-steel in the past, and Figure 16 (a) is the figure of the structure of expression the first universal rolling machine, and Figure 16 (b) is the figure of the structure of expression the second universal rolling machine.

Figure 17 is the figure of the milling method of the expression T-steel in the past that uses thick universal rolling machine, edging mill, smart universal rolling machine.

The specific embodiment

Below, use accompanying drawing to describe the embodiment of manufacture method of the present invention and rolling equipment group in detail.

Fig. 1 shows an example of rolling equipment group of the present invention, in the drawings, and the thick moulding roll mill of 1 expression, 2 expressions the first thick universal rolling machine, 3 expression edging mills, 4 expressions the second thick universal rolling machine, 5 expression finishing mills.The blank steel billet (not shown) of taking out of from heating furnace (not shown) is by the thick moulding roll mill 1 rolling T-steel base that is roughly T shape for cross sectional shape.Can utilize known equipment as thick moulding roll mill 1, for example for the double formula roll mill of the roll with pass has been installed.Utilize the rolling T-steel base that obtains of rolling equipment group, depress web and the edge of a wing (in roll operation), wherein, the rolling equipment group is that the first thick universal rolling machine 2, edging mill 3 and the second thick universal rolling machine 4 approach configuration and form.

Fig. 2 (a) shows the schematic diagram of the structure of explanation the first thick universal rolling machine 2.The first thick universal rolling machine 2 has horizontal roll 21a, the 21b that rotates at trunnion axis and perpendicular roll 22a, the 22b that rotates at vertical axis.

Horizontal roll

21a and 21b configure in opposite directions, and

perpendicular roll

22a and 22b configure in opposite directions.In the present invention, make width (depressing the width of the face) W1 of the roll outer peripheral face of

horizontal roll

21a, 21b greater than the distance of target inside dimensions L(from edge of a wing inner surface to the web leading section of web 11).Preferably, form web 11 target inside dimensions L about 105～150%.

In the first thick universal rolling machine 2, by

horizontal roll

21a, 21b along whole on the short transverse of depressing web 11 as the thickness of slab direction of the web that is rolled part H 11 of T-steel base, the side that utilizes perpendicular roll 22a and

horizontal roll

21a, 21b along the edge of a wing 12 thickness of slab direction depress the edge of a wing 12.Come web 11 is carried out the thickness of slab adjustment by the aperture of adjusting

horizontal roll

21a, 21b, come the thickness of slab adjustment is carried out on the edge of a wing 12 by the aperture between the side of adjusting perpendicular roll 22a and horizontal roll 21a, 21b.When depressing the edge of a wing 12, because do vertically in order to power from the side of the side of

horizontal roll

21a, 21b by perpendicular roll 22a, so preferably make on the perpendicular side of roll 22b by the opposite side that is pressed in

horizontal roll

21a, 21b, so that

horizontal roll

21a, 21b can not move vertically.In addition, the side of perpendicular roll 22b and the horizontal roll pressed by perpendicular roll 22b also can shown in Fig. 2 (b), form the perpendicular shape that does not tilt.

Fig. 3 shows the schematic diagram of the structure of explanation edging mill 3.Edging mill 3 has

edger roll

31a, 31b,

edger roll

31a, 31b have large footpath roll section 33 and path roll section 32 at horizontal axis, 33 guiding of large footpath roll section are rolled the web 11 of part H, roller surface (the depressing face) 32a of path roll section 32 along the edge of a wing 12 width depress the end face 12a on the edge of a wing 12.The roller diameter of preferred large directly roll section 33 and the roller diameter of path roll section 32 are adjusted in the process of the end face 12a that passes through the path roll section 32 rolling edges of a wing 12, the gap that has a little between the top and bottom of the thickness of slab direction of the roller surface of footpath roll section 33 and web 11 greatly.By the gap of a little is set, the unnecessary rolling counter-force of generation when eliminating large footpath roll section 33 and contacting with web, and large directly roll section 33 carries out work as guiding piece, the consistent effect of length that makes till web surface up and down arrives edge of a wing front end up and down can be produced, thereby dimensional accuracy can be improved.Preferred gap is below the 2mm.

Fig. 4 shows the schematic diagram of the structure of explanation the second thick universal rolling machine 4.In addition, Fig. 5～Fig. 9 also is the schematic diagram of the structure of the thick universal rolling machine 4 of explanation, and is as described below, is the distortion of Fig. 4.The second thick universal rolling machine 4 has horizontal roll 41a, the 41b that rotates at trunnion axis and perpendicular roll 42a, the 42b that rotates at vertical axis.

Horizontal roll

41a and 41b configure in opposite directions, and

perpendicular roll

42a and 42b configure in opposite directions.In the second thick universal rolling machine 4, adjust the mill opening of

horizontal roll

41a, 41b and adjust the thickness of slab of web 11, and the aperture between the side of the side by adjusting perpendicular roll 42a and

horizontal roll

41a, 41b is adjusted the thickness of slab on the edge of a wing 12.At this moment, mobile vertically in order not make

horizontal roll

41a, 41b, make the side face c of perpendicular roll 42b contact and configure with the side b of the opposite side of

horizontal roll

41a, 41b.

The width of the roll outer peripheral face of

horizontal roll

41a, 41b (depressing the width of face) W2 form with web 11 in roll distance till the end face 11a of target inside dimensions L(from edge of a wing inner surface to the web leading section of operation) about equally value (be W2＜W1 also can).In addition, roll the target inside dimensions L in the operation in the web 11, the increase of the small web height that the smart universal rolling machine that consider utilizing becomes last rolling process produces is preferably formed usually as with respect to the value about the short 0～5mm of inside dimensions of the T-steel in finished product stage.That is, the width W 2 of the face of circumferentially depressing of preferred levels roll 41a, 41b is with respect to the value about the little 0～5mm of web inside dimensions of T-steel finished product.Because the width of

horizontal roll

41a, 41b is the size that equates with the target inside dimensions L of web 11, thus the front end in contact of perpendicular roll 42b and web 11 and depressing, thus can adjust the shape of height and the end face 11a of web 11.

And, in the present invention, the bight a of the web front of

horizontal roll

41a, 41b is carried out Machining of Curved Surface, chamfering, step etc. perhaps is set.Usually circular-arc processing is carried out in the bight that has the up and down horizontal roll on the thick universal rolling machine of shaped steel on the edge of a wing to being assembled in H shaped steel etc., cooperates the finished form of rolling shaped steel.But rolling to T-steel wished that the web front end is configured as the right angle, thereby from cooperating the viewpoint of finished size same, thinks that the bight of web front does not need to carry out circular-arc processing.But, when the web front end is erected roll 42b and depresses, produce the distortion that the volume of pressure part makes web thickness increase in the cross section.And, in the situation that the bight does not have the space, the distortion of the web front end that is depressed flows to the little gap between the side b of opposite side of the side face c of perpendicular roll 42b and

horizontal roll

41a, 41b, as shown in figure 11, front end at web forms enation 15, and the rolling meeting that utilizes smart universal rolling machine to carry out produces defectives such as sandwiching defective.

For fear of this defective, in the present invention, the horizontal roll bight is processed into the shape of rolling web surface not and is rolled.Thus, because between the side face of the face of circumferentially depressing of

horizontal roll

41a, 41b web 11 front ends near and perpendicular roll 42b, be formed with large space, so form local deformation (projection 15) in little gap when the end face 11a that has prevented at web is depressed.

As concrete example, the shape of the bight a of

horizontal roll

41a, 41b forms the shape that forms by circular-arc processing (Fig. 4, Fig. 7), chamfer machining (Fig. 5, Fig. 8) or step processing (Fig. 6, Fig. 9) etc., and guaranteeing not increases the space that the variant part of web surface of the thickness of slab direction of the web that produces is rolled to the thickness because of the web front end.Circular arc also can be elliptic arc, and in addition, the central angle of circular arc and elliptic arc is not limited to 90 degree, can suitably select.In addition, the angle of chamfering is not limited to 45 degree, can suitably select.When chamfering and step are set, preferably the bight is rounded.

Usually, in the situation that circular-arc processing, implementing arc radius is the above processing of 20mm, in the situation that chamfer machining is implemented the above processing of C20, thereby can be prevented enation.In addition, preferably add man-hour carrying out step, the width of step part is formed more than the 20mm.On the other hand, preferred processing dimension on be limited to make web 11 in roll the target inside dimensions L in the operation the web surface more than 70% be rolled.That is the width W 2 that, is preferably with respect to the roll outer peripheral face of

horizontal roll

41a, 41b is in 30%.Thus, when utilizing perpendicular roll 42b along the end face of the rolling web 11 of the short transverse of web, utilize

horizontal roll

41a, 41b along the major part of the rolling web 11 of thickness of slab direction of web (namely, near leading section), even thereby utilize perpendicular roll 42b to depress the end face 11a of web leading section, web 11 can not buckled yet.

In addition, the horizontal roll bight is being formed in the situation of the shape of rolling web surface not, the web end side of horizontal roll forms the opening greater than web thickness.The A/F d of preferred this opening is (web thickness+10mm)～(about web thickness+200mm).Be limited to more preferably (about web thickness+100mm).Even the shape except above-mentioned shape, the also width of preferred non-rolling section: 30% of 20mm～L, and d is in above-mentioned scope.

The side b of close web front end horizontal roll 41a(41b) can be vertical shown in Fig. 4,5,6 both, also can be shown in Fig. 7,8,9, similarly tilt with the side of edge of a wing side, preferably with the angled θ of vertical: 5＜θ≤10 °.In the situation that inclination is set, consistent with this angle of inclination and the inclination of equal angular also is set in the periphery of perpendicular roll 42b, the width center take roll crown of forming is as the summit and have a laterally zygomorphic chevron shape of the hypotenuse of inclination.Wherein, be provided with width greater than the blunt end part of the web thickness that is rolled part H at the width center of the roll crown of depressing the web front end.

In being undertaken by the first above-mentioned thick universal rolling machine 2, edging mill 3 and the second thick universal rolling machine 4, roll in the operation, carry out back and forth rolling until the shape that acquisition can be carried out finish rolling.Preferably utilize the first and second thick universal rolling machines, the reduction ratio that carries out web thickness and edge of a wing thickness be 10～30% rolling.Wherein, it is rolling below 10% that the specific pass of the last roll mill that also can roll in end etc. carries out reduction ratio, does not perhaps depress and rolled parts is passed through etc.

In addition, when utilizing the second thick universal rolling machine 4 along the rolling web 11 of thickness of slab direction, sometimes produce thickness of slab in the part of being depressed by horizontal roll 41a, 41b and near the part (the web leading section 11a) that is not depressed poor.In the reciprocal operation of rolling, utilize the first thick universal rolling machine 2 to depress the thickness of web front end and to have eliminated thickness of slab poor, even therefore poor also no problem by the second thick universal rolling machine generation thickness of slab.Although worry back and forth producing harmful blemish such as sandwiching defective in the poor boundary portion of thickness of slab in the operation of rolling, according to the inventor's research, in the reduction ratio of web thickness is scope below 30%, do not produce blemish.Wherein, become in the situation of the last roll mill that rolls in the end at the second thick universal rolling machine, the web reduction ratio on the smart universal rolling machine 5 of subsequent processing is little, so also consider to change operation according to the step that produces at the second thick universal rolling machine.That is, poor large to the situation of the indelible degree of finish rolling of being undertaken by smart universal rolling machine 5 at this thickness of slab, oppositely carry and be rolled part H, again utilize the first thick universal rolling machine 2 to be rolled, depress whole of short transverse of web and elimination gets final product.On the other hand, in the situation of the degree that this thickness of slab extent can be eliminated for the finish rolling of being undertaken by finishing mill 5, roll operation in the end, beginning finish rolling operation gets final product.Also can in roll mill opening that the last pass of operation makes the second thick universal rolling machine 4 greater than the size that is rolled part H, not rolling and make and be rolled part H and pass through, in this case, near the web front end, do not produce thickness of slab poor.

In addition, in roll in the operation, preferably be rolled the cross section view of part observing from rolling direction, the angle of the crossing α between the edge of a wing and the web forms 95＜α≤110 °, more preferably forms 95＜α≤100 °.By forming this angle of the crossing, horizontal roll separates after rolling rapidly with the edge of a wing inner face that is rolled, and prevents from producing defective at edge of a wing inner surface.In addition, the roll amount of shortening and improve a piece of writing in the time of can reducing roll wear, thus prolong roll campaign.Form at the angle of the crossing α with the edge of a wing and web in the situation of 95＜α≤100 °, on thick

universal rolling machine

2,4, make horizontal roll 21,41 the side of depressing edge of a wing side with the angled θ of vertical: the mode of 5＜θ≤10 ° tilts.

The invention is not restricted to configuration shown in Figure 1, if having the first thick universal rolling machine 2, edging mill 3 and second thick universal rolling machine 4 each equipment more than one, then can both be suitable for the configuration of other any modes.For example, can be with at least any the continuous configuration in the first thick universal rolling machine, edging mill, the second thick universal rolling machine more than two.In addition, also can change the configuration sequence of the first thick universal rolling machine, edging mill, the second thick universal rolling machine, for example in roll operation begin to configure edging mill, the second thick universal rolling machine most.And it is rolling, direct by (be not rolled and pass through roll mill) that each roll mill can reverse usually, therefore also can make rolling order inconsistent with the order of roll mill.

In to roll T-steel that operation obtains rolling by the finish rolling operation be finished size.The schematic diagram of the structure that smart universal rolling machine is described has been shown among Figure 10.Essence universal rolling machine 5 has horizontal roll 51a, the 51b that rotates at trunnion axis and perpendicular roll 52a, the 52b that rotates at vertical axis, the side of

horizontal roll

51a, 51b and roll outer peripheral face quadrature.

In the finish rolling operation, will rolling the angle of the crossing α that makes the edge of a wing and web in the operation in last operation, to form the angle of the crossing that rolled parts greater than 90 ° angle is configured as the edge of a wing and web be 90 °.When utilizing the rolling edge of a wing that is rolled part H of the smooth perpendicular roll 52a of periphery, the edge of a wing is shaped as vertical with web.The reduction in thickness on the edge of a wing is a few percent, even large also preferred gently depressing below 5%.At this moment, by make perpendicular roll 52b press on

horizontal roll

51a, 51b not with the side of a side in opposite directions, the edge of a wing, can not make

horizontal roll

51a, 51b mobile vertically.

In smart universal rolling machine, web almost is not depressed, and perhaps, is gently depressed with the reduction in thickness of a few percent according to the degree of adjusting shape, size.Especially, by the second thick universal rolling machine 4 carry out rolling, produce in the poor situation of thickness of slab in the part of being depressed by

horizontal roll

41a, 41b and near the part that is not depressed (the web leading section 11a), gently depress web poor to eliminate this thickness of slab.In order to reach this purpose, make the width of the face of depressing of

horizontal roll

51a, 51b greater than web inside dimensions (thereby greater than W2).Preferably, form web 11 inside dimensions about 105～150%.

If use above manufacture method of the present invention and rolling equipment group, then can make the identical and T-steel of a plurality of sizes that edge of a wing thickness is different of inside dimensions.The T-steel that inside dimensions is constant, shown in Figure 13 (a), even edge of a wing thickness t f changes, web inside dimensions Ai is also constant.In the present invention, the aperture between the side of the perpendicular roll 42a by adjusting the second thick universal rolling machine and the side of

horizontal roll

41a, 41b can be adjusted the thickness of slab tf on the edge of a wing.At this moment, mobile vertically in order not make

horizontal roll

41a, 41b, be configured to make the side face c of perpendicular roll 42b to contact with the side b of the opposite side of horizontal roll 41a, 41b.At this because the width of the roll outer peripheral face of

horizontal roll

41a, 41b equates with the web inside dimensions, so can with edge of a wing thickness irrespectively with web inside dimensions Ai rolling be constant size, can easily make the constant T-steel of inside dimensions.

[embodiment]

[the first embodiment]

Use rolling equipment shown in Figure 1, by the steel ingot in the rectangle cross section with thickness 250mm, width 310mm, rolling T-steel take web height 300mm, flange width 100mm, web thickness 9mm, edge of a wing thickness 16mm as target size.

The first thick universal rolling machine 2 uses the roll mill of the structure shown in Fig. 2 (a).The width W 1 of the face of depressing of horizontal roll forms 320mm and is 283mm greater than the target inside dimensions L(of web), the side of horizontal roll and vertical angulation θ are 7 °.About perpendicular roll configuration become in opposite directions, cross sectional shape forms width center take roll crown as the summit and has from the tilted laterally zygomorphic chevron shape of hypotenuse of 7 ° of angles of vertical.In addition, about perpendicular roll in the perpendicular Roller. redress pressing force pressed of the side to horizontal roll so that can not move along horizontal axis because of the rolling horizontal roll that makes to the edge of a wing.

Edging mill 3 uses the edging mill of structure shown in Figure 3.The large-diameter portion of edger roll and the step of minor diameter part are 44mm, and the roll width of guaranteeing large-diameter portion is more than the 500mm, and the roll width of minor diameter part is more than the 200mm.In addition, the inclination angle of step part is with vertical angled 7 °.

The second thick universal rolling machine 4 uses the roll mill of structure shown in Figure 4.The roll mandrel of horizontal roll is not reinforced especially, used common structure.The width W 2 of the face of depressing of horizontal roll is 283mm, with in the web target inside dimensions of rolling in the operation equate, the side of the rolling edge of a wing one side of horizontal roll is from tilted 7 ° of angles of vertical.In addition, the size of the Machining of Curved Surface of horizontal roll bight a forms circular-arc (the web end side A/F d of horizontal roll is the 60mm of the web thickness that is rolled part+approximately) of radius 30mm.In addition, about perpendicular roll in the perpendicular roll of the side that the edge of a wing is rolled, its cross sectional shape forms width center take roll crown as the summit and has from the vertical angle of inclination the laterally zygomorphic chevron shape of 7 ° hypotenuse, and the perpendicular roll of depressing the opposite side of web leading section along short transverse forms the smooth cylinder type of roll crown.

Essence universal rolling machine 5 uses the roll mill of structure shown in Figure 10.The width of horizontal roll is 320mm.

Begin most, utilize thick moulding roll mill 1(to use the double formula roll mill of having assembled concave roll) rolling described steel ingot, form the roughly T-steel base of T section shape.The web thickness of the T-steel base that obtains is 40mm, and edge of a wing thickness is 75mm, and web height is 365mm, and flange width is 130mm.Then, utilize the first above-mentioned thick universal rolling machine 2, edging mill 3 and the second thick universal rolling machine 4 are approached the rolling unit that is configured in order, carry out the back and forth rolling of 5 passes, depress web and the edge of a wing.Roll the pass schedule of operation in table 1, having illustrated.

[table 1]

Table 1

(mm)

Annotate 1:U1: the first thick universal rolling machine

Annotate 2:E: edging mill

Annotate 3:U2: the second thick universal rolling machine

In the second thick universal rolling machine 4, use perpendicular roll to depress the web leading section along the web height direction, web height is adjusted.At this moment, the perpendicular roll of depressing the web front end forms the state with the horizontal roll contacts side surfaces, on one side the axial load of support level roll be rolled on one side.At last, utilize the smart universal rolling machine 5 with horizontal roll and perpendicular roll, the edge of a wing applied gently depress on one side be rolled and the inclination on the edge of a wing be shaped as vertical on one side.Gently depress web portion.Measuring web height, flange width, web thickness, the edge of a wing thickness of resulting T-steel after the hot rolling, is the size with congruence, has confirmed can satisfy by hot rolling manufacturing according to the present invention the T-steel of target size.Especially, the rolling web height that is difficult to adjust by in the past can carry out hot rolling in the scope of desired value ± 1mm, and end surface shape is also good.

Further, use identical rolling equipment, identical and edge of a wing thickness is the inboard constant T-steel of 19mm when making inside dimensions and being 16mm with edge of a wing thickness.T-steel base after using thick moulding roll mill 1 pair cross-section size identical blank steel billet being rolled during as 16mm with edge of a wing thickness is of a size of web thickness 33mm, edge of a wing thickness 75mm, web height 365mm, flange width 123mm.Then, utilize the first thick universal rolling machine 2, edging mill 3 and the second thick universal rolling machine 4 are sequentially approached the rolling unit that configuration forms according to this, carry out the back and forth rolling of 5 passes, depress web and the edge of a wing.Roll the pass schedule of operation in having illustrated in the table 2.

[table 2]

Table 2

(mm)

Annotate 1:U1: the first thick universal rolling machine

Annotate 2:E: edging mill

Annotate 3:U2: the second thick universal rolling machine

In the second thick universal rolling machine 4, use perpendicular roll to depress the web leading section along the web height direction, web height is adjusted.At this moment, the perpendicular roll of depressing the web front end is identical when being 16mm with edge of a wing thickness, forms the state with the horizontal roll contacts side surfaces, on one side the axial load of support level roll be rolled on one side.At last, utilize the smart universal rolling machine 5 with horizontal roll and perpendicular roll, the edge of a wing is applied gently depress and be rolled, the inclination on the edge of a wing is shaped as vertical.Gently depress web portion.Obtained that the each several part after the hot rolling is of a size of web height 303mm, flange width 100mm, web thickness 9mm, the edge of a wing is thickness 19mm and the finished product of size congruence.The web inside dimensions is 284mm, is to be the identical value of the finished product of 16mm with edge of a wing thickness.

On the other hand, as a comparative example, use and to set to such an extent that the rolling equipment in the past (Figure 14) that consists of greater than the thick universal rolling machine of web width, edging mill rolls operation in implementing by a face width degree of depressing with horizontal roll, make T-steel.Steel ingot size, the T-steel each several part target size after hot rolling is identical when being 19mm with the edge of a wing thickness of the inventive example.Roll the pass schedule of operation in having illustrated in the table 3.Only having a thick universal rolling machine in the equipment of comparative example, is the back and forth rolling of 9 passes so carry out the pass number, rolling until target size.

[table 3]

Table 3

(mm)

Annotate 1:U: the first thick universal rolling machine

Annotate 2:E: edging mill

In comparative example, because can not depress the front end of web, so web height greater than the 300mm of target, forms about 306mm, produced size and departed from.Therefore, need to cut off the end of web after rolling, need spended time and expense, manufacturing cost increases.In addition because the pass number increases, so compare with embodiments of the invention, in the rolling time that rolls increase to about 2 times, productivity ratio significantly reduces.

In addition, in above-described embodiment of the arrangement of having used table 1 and table 2, attempting the width of the horizontal roll of W1 and smart universal rolling machine is changed to respectively 340mm, but the result is still good.And, in the above-described embodiments, the chamfer machining (Fig. 5) of the shape of the bight a of the horizontal roll of the second thick universal rolling machine 4 being carried out C20 (d=web thickness+40mm) and to it (d=web thickness+30mm) replaces circular-arc (Fig. 4) of radius 30mm and in the situation about being rolled, the result is also still good from the bight of horizontal roll to carrying out step processing (Fig. 6) the width 50mm.

[embodiment 2]

The below is as the second embodiment of the present invention, uses rolling equipment shown in Figure 1 rolling with web height 500mm, flange width 150mm, web thickness 12mm, the edge of a wing thickness 22mm T-steel as target size from the steel ingot in rectangle cross section with thickness 300mm, width 620mm.

The first thick universal rolling machine 2 uses the roll mill of the structure shown in Fig. 2 (b).The width W 1 of the face of depressing of horizontal roll for 530mm greater than the web inside dimensions, the side of horizontal roll and vertical angulation θ are 7 °.About perpendicular roll configuration become in opposite directions, form width center take roll crown as the summit and have from the vertical angle of inclination the laterally zygomorphic chevron shape of 7 ° hypotenuse at cross sectional shape.In addition, about perpendicular roll in the perpendicular Roller. redress pressing force of the side of pressing horizontal roll so that horizontal roll can be because not moving up at trunnion axis to the rolling of the edge of a wing.

Edging mill 3 uses the edging mill of structure shown in Figure 3.Large-diameter portion and the step between the minor diameter part of edger roll are 67mm, and the roll width of guaranteeing large-diameter portion is more than the 550mm, and the roll width of minor diameter part is more than the 200mm.In addition, the inclination angle of step part and vertical are angled 7 °.

The second thick universal rolling machine 4 uses the roll mill of structure shown in Figure 4.The width W 2 of the face of depressing of horizontal roll for 477mm with in the web target inside dimensions of rolling in the operation equate 7 ° from the vertical angle of inclination of the sides of horizontal roll of depressing the edge of a wing.In addition, the size of the Machining of Curved Surface of horizontal roll bight a is circular-arc (the d=web thickness+60mm) of radius 30mm.In addition, about perpendicular roll in the perpendicular roll of a side on the rolling edge of a wing, form width center take roll crown as the summit and have from the vertical angle of inclination the laterally zygomorphic chevron shape of 7 ° hypotenuse at cross sectional shape, the perpendicular roll of depressing the opposite side of web leading section in short transverse forms the smooth cylinder type of roll crown.

Essence universal rolling machine 5 uses the roll mill of structure shown in Figure 10.The width of horizontal roll is 520mm.

At first, use thick moulding roll mill 1 that described Rolling from Ingot is made the roughly T-steel base of T section shape.The web thickness of the T-steel base that obtains is 50mm, and edge of a wing thickness is 95mm, and web height is 585mm, and flange width is 185mm.Then, utilize the first above-mentioned thick universal rolling machine 2, edging mill 3, the second thick universal rolling machine 4 are sequentially approached the rolling unit that configuration forms according to this, carry out the back and forth rolling of 5 passes, depress web and the edge of a wing.Roll the pass schedule of operation in table 4, having illustrated.

[table 4]

Table 4

(mm)

Annotate 1:Ul: the first thick universal rolling machine

Annotate 2:E: edging mill

Annotate 3:U2: the second thick universal rolling machine

Utilize the second thick universal rolling machine 4 so that the perpendicular roll of web front is rolled by the state that is pressed in the horizontal roll side, depress the web leading section along the web height direction, web height is adjusted.At last, utilize the smart universal rolling machine 5 with horizontal roll and perpendicular roll, the inclination on the edge of a wing is shaped as vertical.Measure web height, flange width, web thickness, the edge of a wing thickness of the T-steel that obtains after the hot rolling, the size of formation and congruence, web height is in the scope of desired value ± 1mm, and end surface shape is also good.

As a comparative example, use in the rolling equipment enforcement in the past that is consisted of by the first universal rolling machine (a) shown in Figure 16, edging mill and the second universal rolling machine (b) and roll operation, make the T-steel of same size.Roll the pass schedule of operation in table 5, having illustrated.In the equipment of this comparative example, because can not use the second universal rolling machine to depress the thickness on web and the edge of a wing, so carry out the reciprocal rolling target size that is rolled down to that the pass number is 9 passes.Therefore, compare with embodiments of the invention, in the rolling time that rolls be increased to about 2 times, productivity ratio significantly worsens.Finished size and congruence do not have special problem.

[table 5]

Table 5

(mm)

Annotate 1:U1: the first thick universal rolling machine

Annotate 2:U2: the second thick universal rolling machine

Can confirm according to above result, manufacture method and rolling equipment by T-steel of the present invention, even large-sized T-steel that web height 500mm, flange width 150mm are such, also can make the good T-steel of dimensional accuracy by hot rolling, and compared with the past, significantly improved rolling efficiency.

Industrial applicibility

Manufacture method and rolling equipment group according to T-steel of the present invention, can obtain just can make the shape of web leading section good and can obtain accurately effective manufacture method and the rolling equipment group of the T-steel of the web height expected by hot rolling, industrial extremely useful.

Label declaration

1 thick moulding roll mill

2 first thick universal rolling machines

3 edging mills

4 second thick universal rolling machines

5 smart universal rolling machines

10 T-steels

11 webs

11a end face (web)

12 edges of a wing

12a end face (edge of a wing)

15 enations

21a, 21b horizontal roll

22a, 22b erect roll

31a, 31b edger roll

32 minor diameter parts

32a depresses face

33 large-diameter portions

41a, 41b horizontal roll

42a, 42b erect roll

51a, 51b horizontal roll

52a, 52b erect roll

The width of the outer peripheral face of the horizontal roll of W1 the first thick universal rolling machine

The width of the outer peripheral face of the horizontal roll of W2 the second thick universal rolling machine

The target inside dimensions of L web

H is rolled part (T-steel base)

The a bight

The b side

The c side face

The d A/F

The inside dimensions of Ai, Ai1, Ai2, Ai3 web

The side dimension of Ao, Ao1, Ao2, Ao3 web

Tf1, tf2, tf3 edge of a wing thickness

Claims

1. the manufacture method of a T-steel comprises: in roll operation, be that web and the edge of a wing of the T-steel base of T shape shape is rolled to dumming; And the finish rolling operation, carry out it is characterized in that form the finish rolling of finished form by the T-steel base that rolls the operation acquisition in described,

Rolling operation in described comprises:

The rolling process that is undertaken by the first thick universal rolling machine (2), in the described first thick universal rolling machine (2), whole on the short transverse of web (11) depressed as the face of depressing this roller outer peripheral face by the horizontal roll (21a, 21b) up and down that the width (W1) that use makes the roller outer peripheral face is larger than the target inside dimensions (L) of web along the thickness of slab direction;

The flanging operation is depressed the end face (12a) of the edge of a wing (12); And

The rolling process that is undertaken by the second thick universal rolling machine (4), in the described second thick universal rolling machine (4), use the width (W2) of roll outer peripheral face and bight (a) web leading section side identical with target web inside dimensions (L) be processed to rolling web surface not shape about horizontal roll (41a, 41b), depress web (11) near leading section the top and bottom of thickness of slab direction, and about perpendicular roll (42a, the perpendicular roll (42a) of the side 42b) along the edge of a wing thickness of slab direction of (12) depress the edge of a wing (12), the perpendicular roll (42b) of opposite side makes outer peripheral face and up and down horizontal roll (41a, 41b) contact and depress the end face (11a) of web (11) along the short transverse of web (11).

2. the manufacture method of T-steel as claimed in claim 1 is characterized in that,

In the rolling process that is undertaken by the described second thick universal rolling machine (4), the outer peripheral face of the perpendicular roll (42b) of depressing web end face (11a) is contacted with up and down horizontal roll (41a, 41b) and adjust the perpendicular roll (42a) of opposite side and the aperture between horizontal roll up and down (41a, the 41b) side, make thus the constant and T-steel of a plurality of sizes that edge of a wing thickness is different of web inside dimensions.

3. the rolling equipment group of a T-steel, the T-steel base take dumming as T shape shape is as being rolled part, and rolling this is rolled web and the edge of a wing of part, it is characterized in that, disposes:

The first thick universal rolling machine has the width of roll outer peripheral face greater than the described horizontal roll up and down that is rolled the target web inside dimensions of part;

Edging mill is depressed the described end face that is rolled the edge of a wing of part; And

The second thick universal rolling machine, have up and down horizontal roll and about perpendicular roll, in the described horizontal roll up and down, the width of roll outer peripheral face is identical with the described target web inside dimensions that is rolled part, and the bight of web front is processed to the not shape of rolling web surface, in the perpendicular roll about described, the perpendicular roll of one side is depressed this edge of a wing along the thickness of slab direction on the edge of a wing, and the perpendicular roll of opposite side makes the outer peripheral face of this perpendicular roll contact with up and down horizontal roll and depresses the end face of web along the short transverse of web.