SU1532124A1 - Method of producing roll-formed sections - Google Patents

Abstract

The invention relates to the processing of metals by the pressure of sheet material in rolls and is intended for use primarily in ferrous metallurgy. The purpose of the invention is to improve the quality of profiles. In each rough technological forming junction, the bending point 3 of the U-shaped element is formed by bending its peripheral sections 4 with an internal radius determined by the calculated dependence. In each technological forming junction, except for the last, the place of the bend of the U-shaped element is formed with the sweep width greater than its sweep width on the finished profile. Moreover, this excess is reduced by transitions from its maximum value in the master technological transition to zero in the last technological forming transition. The difference in the width of the sweep of a U - shaped formable element in two adjacent transitions is maintained the same in all pairs of rough technological forming transitions. The difference in the width of the sweep of a U - shaped formable element in two adjacent transitions is maintained the same in all pairs of the last transitions, starting with the pairs that include the final technological forming transition. The difference in the width of the sweep of a U-shaped element in two adjacent technological transitions in each of the pairs of neighboring rough transitions is two to three times less than in each of the pairs of recent technological transitions, starting with the pairs that include the last pre-finishing forming transition. The method makes it possible to reduce the thinning of the base and protective metal to cover the places of bending of the U-shaped elements. 4 hp f-ly, 2 ill., 2 tab.

Description

The invention relates to the machining of sheet material with special shaped rolls and is intended primarily for use in ferrous metallurgy, as well as transport, tractor and agricultural machinery, shipbuilding and construction.

The purpose of the invention is to improve the quality of the profiles by reducing the thinning of the base metal and the protective coating of the places of bending of the U-shaped elements.

FIG. Figure 1 shows the pattern of forming a special bent channel profile rolling profile with a U-shaped element on the wall with a gap between the branches of this element exceeding two thicknesses of the workpiece metal, thin-seated, less than 1.5 mm thick, with a protective coating in accordance with paragraph 1 way (technological transitions); FIG. 2 is a diagram of the molding of a special bent profile of a channel-type rolled steel with an I-shaped element on the wall with a gap between the branches of this element that exceeds the two thicknesses of the billet metal, thin-walled, less than 1.5 mm thick, with a protective coating according to item 1, 2, under item 1, 2, 3, under item 1, 2, Aipopp. 1, 2, 3, 4, 5 ways.

In the manufacture of a special bent profile with an I-shaped element to the task of the workpiece 1 in the calibers of the forming rolls of it together with the section

2 under the place of bending 3 of the U-shaped element is moved in the specifying transition 1a along the roll forming mill.

In each preliminary technological forming transition Ila-Illa, the bending point 3 of the U-shaped element is formed by bending its peripheral sections 4 with an inner radius equal to

Rj, (R (,,, + 0,5S) -1- -0.55 „, (1)

with a flat central section 5 variable in transitions of the width and hem of each flat branch 6 of the U-shaped element at an angle of 0.5 ° C until reaching in the last rough technological forming transition llla of the bending angle of the bend 3 of the moldable element equal to

c6 (0.8 .. 40.9) - J

(2)

where n is the number of draft technological forming transitions; the inner radius of the bend 3 of the formable and-shaped element in the last draft of the technological forming transition;

inner bend radius 3 of the formable i-shaped element on the finished profile; SQ is the metal thickness of the workpiece 1;

o.p

fr.K

 l L.

Pi,

the bend angle of the bend point 3 of the formable i-shaped element in the last draft.

15

technological forming transition;

i is the number of the black technological forming junction; rf, - is the bending angle of the bend point 3 of the formable i-shaped element i-TOM of the rough technological forming junction.

In this case, the width of the flat central area 5 is determined by the formula obtained from the geometric relations

b, .- (, 5S) 1 (1- -),

ieisn-1 (3) The width of the flat central part of the place of bending of the U-shaped element in the last rough technological forming transition is zero.

(BUT)

In the pre-technological technological transitions IVa, the place of the bend of the 3 and-shaped element is molded with radius R. At the same time, each flat branch of the 6-U-shaped element is bent at an angle O, 5 oij O, 3k, where j is the number of the pre-finishing or finishing technological forming ,

In the finishing technological forming transition Va, the profile is updated to a given configuration, reaching the gap between the flat branches of the I-shaped element I, the internal radius of the bend R f, and the bending angle of the bend “i - i”. ptgo element in predisturbing IVa and finishing Va technological forming transitions is zero

, n- -ltfJ: m, (5)

where m is the number of technological transitions.

In the manufacture of a special bent rolling profile with a U-shaped element, in advance of the start of forming the profile in section 2, under the place of bend 3 of the U-shaped element of workpiece 1, an excess of metal 7 is created by exceeding the width of section 2 under the place of bending 3 of the U-shaped element over its width sweep on the finished profile by

Ab, K (, 5SJV (4Ti-l), (6)

where d b - the excess width of section 2 of the workpiece under the place

0

five

0

5 jq

, -,

,

Q

five

B tg- relative gap between

bending of the 3 i-shaped element over the width of the sweep of the place of bending of the U-shaped element on the finished profile; K - empirical coefficient

(, 030.04);

H S

 flat branches 6 U-shaped element on the finished profile;

H is the gap between the flat branches of the 6-and-shaped element of double thickness on the finished profile. Prior to the task of the workpiece 1 in calibers 4, the shaping rolls, together with section 2, under the bend position 3 of the U-shaped element, are moved in the master junction 16 along the roll forming mill.

In each technological formative transition II6-IV6, except for the last V6, the bend position of the 3 U-shaped element is formed with the sweep width, which is greater than the width of its sweep on the finished profile by an amount db (and}), and the excess is reduced by transitions from its maximum values of lb in the master TochI I 1

logical transition 16 to zero is the last technological forming transition V6.

In each preliminary technological forming junction II6-III6, the bending point 3 of the U-shaped element is molded by bending its peripheral portions A with B11ut1-) extraction. the radius Rg, the value of which is determined by the dependence () of Cree flat central area 5

b (Rg, -Y, 5S „); (l-) + db ,;

 s-ifn (7) and the hem of each flat branch 6 of the i-shaped element at an angle of 0.5ei, until the bending angle 3 in the last rough technological formative transition II16 of the bend is the place of the bend 3 of the U-shaped formable element, the size of which is according to (2).

In the pre-technological technological forming transitions IV6, the formation of the bend point 3 of the U-shaped element is achieved by bending its cerifersion sections 4 with an inner radius R (, with a flat central section 7 wide

, j, (8) and at the same time bend each flat branch 6 of this element by an angle of 0, 5, 5 о6 „.

In the finishing process molding V6, the profile to the specified configuration is completed, the gap between the flat branches of the I-shaped element H, the inner radius of the bend point R and the bend angle of the bend point are reached.

The manufacture of a special bent profile with an I-shaped element is characterized by various quantitative ratios with respect to the distribution of the excess metal of the workpiece along technological forming transitions.

In the manufacture of a special bent profile with an I-shaped element, the difference in the widths of the sweep of a formable i-shaped element in two adjacent technological transitions forming this element is maintained the same in all pairs of draft technological forming transitions.

In the manufacture of a special curved profile with an I-shaped element, the difference in the widths of the sweep of a formable I-shaped element in two adjacent technological transitions forming this element is maintained the same in all pairs of last transitions, starting with the pairs that include the first pre-finishing process. forming transition.

In the manufacture of a special bent profile with a double-thickness element, the difference in the widths of the sweep of a formable i-shaped element in two adjacent technological transitions forming this element in each of the pairs of adjacent draft technological transitions is two to three times smaller than in each of the last technological transitions, starting with the pairs in which the last preparatory technological forming transition enters.

The method can be carried out using a device containing a set of rolls for the manufacture of special curved rolled sections with i-shaped elements, with a gap between the branches of these elements exceeding two thicknesses of the billet metal, with a thickness less than 1.5 mm, with a protective coating.

 Q

5321248

So, for example, the mode of profiling in the manufacture of a special bent profile 100x50k20) 1.4 mm with an i-shaped element made of galvanized steel {with a gap between flat

branches of the element of double thickness H

g l2 mm, with a sweep width

2R

places of bending, 0 mm, with the thickness of the metal of the workpiece, 4 mm) under item 1 of the method are given in table. one.

The profile was molded in a pre-cast process on a profile mill 1, .. ,, 450, ..., 300 from a rolled billet.

To the task of the workpiece I, in the calibers of the forming rolls, it was moved along with section 2 under the bend of 3 U-brasons in the first transition 1a along the roll forming mill.

The bending angle dC of the bend point of the 3 I-shaped element in the last draft transition was calculated from the dependence (2)

ei (0.8, ..., 0.9) 144,. . ., 162

(9)

, 150

whether

The number of draft technological forming transitions (five) and

the bending angle of the flat branches of the U-shaped element per pass (15 °) was determined by the method of expert estimates. In the rough technological forming junctions of the second and fifth On and the last sixth Ilia, the bending of 3 double thickness elements was molded by bending its peripheral sections 4 with an inner radius R, 5, the value of which was calculated from dependence 1:

180

Rj.e (6.0 + 0.5 1.4) 7.3 mm

130

-0.5-1.4 (10)

with a flat central section 5 variable by the width transitions, the size of which is determined by the formula (4). Simultaneously with the molding of the bend 3 in the second to sixth drafts of the technological forming Ila-IIIa junctions, the flat branches of the 6 of the i-shaped element were folded at an angle of 0.5c6 / until the sixth (last draft) technological forming transition of the bend angle r, 150 was reached.

According to the dependence f 5J, the width bg of the flat central section 5 of the bend site of the 3 U-shaped element in the sixth (last) formation-forming transition was zero.

In the seventh prelaunch IVa and the eighth chaotic Va of the technological forming junctions, the U-shaped element was deformed to the given dimensions. The bending angle of the i-place of the bend of the U-shaped element in the seventh pre-final technological forming transition was determined by the method of expert assessments. The value of the inner radius Rj of the place of bending of the i-shaped elemeite in the seventh pre-final technological forming transition was determined by the dependence

.

(eleven)

and the width of the sweep bend - according to the formula

Bn- (K, «+ 0.5S,) (Eg + 0.5SJ.

After substituting the numerical values of the geometric parameters from the dependencies (1 1) ii (12) received

. (R6 ,, - K), -0.530- (6.0+ for -0.5-1, mm.

 Bd

-Y, 5-I I) ff -0,5-1 ,, mm. (13)

According to dependence (6), the width b of the flat central section 5 of the bend site of the 3 U-shaped element in the seventh pre-final technological transition IVa was zero.

Eight technological transitions were required to obtain the finished profile in accordance with clause 1 of the method. The maximum value of the thinning of the base metal of the bend of the U-shaped element was 0.1 mm (7%), the maximum value of the thinning of the zinc coating was 14-16 microns (35-40% with the thickness of the zinc coating of the blank 4.0 microns).

The profiling mode in the manufacture of a special bent profile 100 "50x2Cx1.4 mm with a double thickness element made of galvanized steel (with a gap between the flat branches of the U-shaped element 12 mm, with a sweep width of the bending point L 22.6 mm and the thickness of the workpiece So 1, 4 mm), determined according to p. 1, 2 ways, are given in table. 2

The profile was molded in a continuous manner on a roll forming mill 1, ... 450, ..., 300 from a roll billet whose width is greater than the width

ten

15

20

25

thirty

35

40

- 55, 45

50

vertiki finished profile on l.

I g

I, 6 MM.

The magnitude of the precursor width of the workpiece over the width of the sweep of the finished profile was determined from the dependence (b) at K-0.0395: bb, - K (, 58)) - 0.0395 "

"(6.0-U, 5-1.4) (-i) -i, 6 mm

Before the task of preparation I, in the calibers of the forming rolls, together with section 2, under the place of bending, 3 U-shaped elemite was moved in the first passage 16 along the bending stave.

In the second-sedative technological -forming transitions II6-IV6, the place of the bend of the 3 and -shaped element was molded with the width of the sweep, the greater width of its sweep and of the finished profile b, 1.6 mm in the first techiological transition 16 to zero in the eighth (last) technological-forming forming transition V6. The values of the mentioned excess db (4b ";), in the second-seventh technological forma- tion transitions II6-1V6 were determined by expert method s estimates.

The bending angle of about 6 ° the place of bending of the 3 and-shaped element in the sixth (last draft) technological forming transition was calculated from (2). According to dependencies (9), they accepted.

The number of rough technological forming transitions - five and the angle of the hem of the flat elements of the branches of the I-shaped element during passage 15 were determined by the method of expert assessments.

In the second to the sixth draft technological forming transitions 116– III6, the bending point 3 of the i-shaped element was molded by bending its peripheral sections 4 with an internal radius R | was calculated according to (7). Simultaneously with the molding of the bend point 3 in the second-sixth rough technological forming transitions 11-Illa, flat branches 6 of the i-shaped element were folded at an angle of 0.5 to

Achievements in the sixth (last draft) technological formative transition I1I6, bending angle "150.

According to dependence (6), the width of the flat central section 7 of the bend site of the 3 U-shaped element in the sixth (last draft) technological forming junction was 4b (0.6 mm).

In the seventh prbdchistovogo technological forming transition IV6, the bending of the 3 of the i-shaped element was molded by bending its peripheral sections 4 with an inner radius, the magnitude of which was determined according to (II), (12) with a flat central section 7, the width of which was determined by the dependence ( 8J. At the same time, the flat branches of the 6-U-shaped element were bent at an angle of 0.5fti, the magnitude of which was determined by the method of extrusion; -th estimates.

In the eighth finishing technological V6 transition, the profile was deformed to a given configuration, reaching the gaps between the flat branches of the H-shaped element H, the inner radius of the bend R and the bend of the bend A, d.

To obtain the finished profile according to p. 1 of the described method, it took eight technological transitions. The maximum value of the thinning of the main metlla of the bend of the i-shaped element was 0.05 mm (3.5%), the maximum value of the thinning of the zinc coating was 8-9 microns (20-22% with a zinc coating thickness of 40 microns).

Experimental verification of the method according to claims. 1, .2 was carried out at three

different principles of distribution of technological transitions exceeding the width of the section of the workpiece under the place of bending of the U-shaped element over the width of the sweep of the place of bending of the I-shaped element on the finished profile;

a) according to claim 1, 2, 3 of the method - so that the difference in the widths of the sweep of a formable i-shaped element in two adjacent technological transitions forming this element is kept the same in all pairs of draft technological formation transitions;

b) according to PL1. I, 2, 4 ways - so that the difference in the widths of the sweep of the formable i-shaped element in two adjacent formable this element technological transitions kept the same in all pairs of recent transitions, starting with the pairs that include the first perfect technological forming transition;

c) by pp 1, 2, 3, 4, 5 ways - so that the difference in the widths of the sweep of a formable i-shaped element in two adjacent technological transitions forming this element in each of the pairs of adjacent draft technological transitions was held two to three times smaller than in each of the last pairs technological transitions, starting with the pairs that include the last gftechistovoy technological forming transition.

The quality of the finished profiles, manufactured according to the described method according to PP 1, 2 with three different principles of distribution over technological transitions exceeding the width of the blank section to bend the U-curved element over the sweep width of the bend of the U-shaped element on the finished profile according to the described method in paragraph 1, 2, 3, according to . Clauses 1, 2, 4 and according to Clauses 1, 2, 3, 4, 5 was approximately the same: the maximum value of the thinning of the base metal of the U-o5pa: jHoro bending point of the element was 0.05 mm (3.5%), the maximum value of the thinning of the zinc coating was 8-9 microns (20 -22% with a zinc coating thickness of 40 microns).

According to the experimental testing data on the roll forming mill 1, ..., 4-50, ..., 300, the manufacturing method allows, in comparison with the known method:

a) improve the quality of profiles by reducing the thinning of the base metal and the protective coating of the bending places of the i-shaped elements (for example, when making a special bent profile 100x50 20x1.4 mm with a double thickness element made of galvanized steel, according to method 1, the maximum value of thinning The base metal of the bend of the U-shaped element was 0.1 mm (7%), the maximum value of the thinning of the zinc cover was 14-16 microns (35-40%), with 13

prepared according to p. 1, 2 of the method, the maximum amount of thinning of the base metal was 0.05 mm (3.55), the maximum value of the thinning of the zinc coating was 8-9 microns (20-22%); in the manufacture according to the known method, the maximum value of the base metal was 0.15 mm (11%), the maximum zinc thinning was 24-28 microns (60-70%);

b) to expand the range of special bent rolled sections with U-shaped elements with a gap between the flat branches of these elements (due to profiles, the production of which was not previously mastered due to technological difficulties), to reduce the simple mill by reducing

Research Institute time adjustment and setting of 8-10%.

Claims (5)

Invention Formula I, A method of manufacturing curved rolled profiles containing a U-shaped element, including myo-transition forming the bending of a profile by symmetrically bending its peripheral sections, with a constant n rough transitions of internal radius with a flat central section of variable width and symmetrical hemming and flat branches U-shaped element, about tl and ch and d D; and so that, in order to improve the quality of the thin-walled crowd profiles, some less than 1.5 mm with a gap between the branches of the U-shaped element greater than two. the thickness of the billet metal, and with a protective coating due to a decrease in the thinning of the base metal and a protective coating of the bend points of the U-shaped element, in each rough technological transition, forming a U-shaped element, the profile bend is shaped by bending its peripheral sections with an internal radius equal to Rfc, H (Rg, 0.5S), 5So. and the hem of each flat branch of the i-shaped element is produced at an angle of 0.5 vol., until the last bending technological forming transition attains the bending angle of the formable i-shaped element, equal to:: (0.8, ..., 0.9 ), 124 14 ten (five 20 25 thirty 35 0 five 0 where n is the number of draft technological forming transitions; RI is the inner radius of the place of bending of the i-shaped formable element in the last draft technological forming transition; R is the inner radius of the place of bending of the i-shaped molded element on the finished profile; Sg is the thickness of the billet metal; L is the bending angle of the place of bending of the formable i-shaped element in the last draft technological forming transition; i is the number of the draft technological forming transition; ai; - the bend angle of the bend i-shaped formable element in i-oM draft technological forming transition. 2. The method according to claim 1, characterized in that in each technological forming junction, besides the latter, the place of bending of the U-shaped element is formed with a sweep width greater than its width on the finished profile, while this excess is reduced by transitions from its maximum value in the master technological transition to zero in the last technological forming transition, and the magnitude of the excess sweep width of the U-shaped element in the master technological transition over the sweep width of this element on the finished product fillet is determined by dependency Abn., - K (Rb, + 0.5S) - (- Vh -l), where l P.1 To exceed the width of the sweep of the i-shaped element in the master technological transition over the width of the sweep of the U-shaped element on the finished profile; empirical coefficient (, 03, ..., 0.04); H S  the relative gap between the branches of the i-shaped element; H is the gap between the branches of the O-ob- 5th element. 3. The method according to paragraphs. 1 and 2, characterized in that the difference in the widths of the sweep of a formable i-shaped element in two adjacent molds, this element of technological transitions is maintained the same for all pairs of rough technological forming transitions. 4. The method according to paragraphs. 1 and 2, characterized in that the difference between the widths of the raververtka of the formable U-shaped element in two adjacent technological transitions forming this element is maintained the same for all pairs of the last transitions, starting with the pairs that contain the first pre-technological forming transition, 5. The method according to paragraphs. 1-4, characterized in that the difference in the widths of the sweep of a formable U-shaped element in two adjacent technological transitions forming this element in each of the pairs of adjacent draft technological transitions is two to three times less than in each of the last pairs of technological transitions Starting with the pairs into which the last pre-final is entered technological forming transition. Table 1 table 2 I.S Suf FIG. g