Rolls of front stands of section bending mill and method for shaping section at technological transition for making ledge band

FIELD: plastic working of materials, namely tools for making thin-web sections such as bands of ledges.

SUBSTANCE: rolls include working roll grooved pass, shaping rolls, centering guiding beads of lower roll with distance between its inner end surfaces equal to width of section at inlet of rolls, cone members accompanying preliminary shaping of section until its inlet to working grooved pass. Cone surfaces trapping guided section are formed on guiding beads in front of its inner end surfaces. On cone members accompanying preliminary shaping of section before it penetrates closed working roll grooved pass there are inner end surfaces. Distance between cone surfaces and end surfaces is equal to width of section shaped in closed roll grooved pass. Method comprises steps of trapping introduced section, centering it along inner guides of roll ends, preliminary shaping of section along cone surfaces of rolls by free bending until section penetrates working roll grooved pass. Inlet section is trapped before centering it by means of cone surfaces of guiding beads and after preliminary shaping of it by free bending in cone members of rolls section is specially pulled in by means of upper rolls to working roll grooved pass at restricting section by width during manufacturing transition.

EFFECT: improved accuracy of shaping process.

4 cl, 3 dwg

 

The invention relates to the field of metal forming, in particular by shaping tool for the manufacture of thin-walled profiles from a piece of workpieces, in particular for the manufacture of profiles tires eaves, in mechanical engineering.

A well-known tool for the manufacture of thin-walled profiles from the roll of tape in roll forming mill with a working stream, the locking position of the profile edges. Catching the tapered profile of the elements in these rolls no. Roll the tape when the adjustment is forcibly pushed into the stream rolls. The roll is unwound, molded, cut to the appropriate length, and then coming out of the mill end of the roll are connected by welding with the incoming end of the new roll until the completion of the fabrication of this profile. (See Whitewidow, Mpiexec. Production of cold-formed thin-walled profiles. The album transitions profiles 1, 3 and others. Gonioctena on ferrous and nonferrous metallurgy. - M., 1959)

The disadvantage of this tool is the lack of safety elements of the approach profile, which makes it impossible piece profiling. About this Whitewidow writes on str 7 "For shaping machines work with a piece blanks, as a rule, impossible."

Known grading tool front stands for the manufacture of a piece profiles from sheet IU the Alla in forming mill, consisting of closed calibers work stream and catching the incoming profile tapered surfaces [see RTM-105-0-210-83. The curved profiles. Typical technological processes of manufacture. Rostov-on-don. NIITM, p.121, cert (2)] or SU 408688 21D 5/06 30.11.1973. Famous rolls were used Rostov Netmom for the manufacture of a piece profiles in the range of thickness 0,8...2 mm of relatively hard metal, and when molding profiles 0.5 mm thick and thin soft metal and in the presence of safety cones were used auxiliary roller device. In the presence of safety cones when the forming roll of tape she got into streams rolls and passed without pushing through all pairs of rolls. However, when complex forming the Central part of the profile in the transition it is necessary to capture the profile to lock in the guide member, pre-free molding fixing the width of the finished profile before the final hard molding in a closed stream.

The closest analogues to declared the rolls are on the configuration of the working stream rolls rolls working stand forming mill:

[SU 1072949 A 21D 5/06 15.02.84 (3)

SU 1077680 A 21D 5/06 07.03.84 (4)

SU 1303213 A1 21D 5/06 15.04.87 (5)]

These rollers are designed to produce profiles of channels equal and not equal not far from concoct the metal frame and conditions forming in the claimed rolls and famous are not the same.

Swath working stand (SU 1072949 21D 5/06) contains the lower composite roll comprising a cylindrical roll base to form the walls of the channel, two identical tapered rollers in the form of shelves equal channel in the transition, two identical conical elements for advanced flexible channel racks and two cylindrical guides shoulders, limiting work stream bottom swath width of the incoming profile from the previous roll and the upper roll is made in the form of a cylindrical body wall profile of the channel.

The profile of the channel, the shelves of which is bent at an angle αmoving along the mill gets forced into the stream between the inner end surfaces of shoulders due to the lack of safety cones on the front part of shoulders, centered alignment clamps the bottom of the roll, and then, reaching cone plots pre flexible, changes its form by the gradual bending on the corner β.

This ensures continuous contact edges; bends our channel racks with piles of rolls from the entrance to the axial plane of the rolls to prevent lateral displacement profile in rolls and performance his plots, to reduce raznostoronnesti shelves profile and crushing edges of the profile.

The disadvantage of the rolls is derived from the purpose of the rolls. These rolls pre is scheduled for moulding the profile thickness of 2 mm and more. The lack of safety cones at the entrance of the profile creates difficulty with penetration profile in the stream, due to the fact that the moulding in such an open stream is a free and flexible with a maximum springback angles for metal thickness of 2 mm or more. Valid input width of the profile at the inlet is larger than the estimated. In addition, the profile, moving from the roll to the roll position, away from the axis of the profile. All this input distorts the shape of the inbound profile and send the profile between the guide ends of the clamps can only force, and the free flexible is not always straightens error log profile.

Swath working stand (SU 1077680 A 21D 5/06) intended for the manufacture of unequal profiles of the channels. Because of this form this roll is different from the rolls (SU 1072949 A). Roll this contains the lower composite roll comprising a cylindrical roll shape profile wall, two conical rolls in the form of shelves profile in the final forming of different sizes due to the differential channel racks, cone element pre-forming side of a small wall and guide shoulders with the distance between the inner ends of their theoretically equal to the width of the incoming profile.

The forming cone roll from a large shelf does not limit the width of the final shape of the finished profile of the channel.

The formula is hung is on δ =m(Cosαm-Cosβmand Dmonly narrows the range of application rolls. The upper roller of this channel are identical in form and purpose from the upper roller (SU 1072949 A). Profile shelves, bent theoretically on the corners αδ- more shelves and αmthe smaller shelves, comes in force between the ends of the guides shoulders, and then simultaneously touches the top points of the diameters of the conical elements adjacent to the guide piles, and ends the forming cone roll, forming the final shape of the channel racks.

According to the applicants, it prevents lateral displacement profile in rolls and performance sections, longitudinal twisting to the side of the bended form more shelves and longitudinal bending.

The disadvantages are the lack of safety cones at the entrance of the profile, as well as other disadvantages due to the free flexible shelves.

Swath working stand (SU 1303213 21D 5.06) on the appointment and shape similar to the swath (SU 1072949), only it is made structurally lightweight.

In addition to the disadvantages of the molding profile (SU 1072949) it is not a fixed limit restriction profile in the final stages of forming and this in combination with the free Flex profile of the upper roller does not prevent lateral displacement and performance.

Due to outline the military disadvantages of the known rolls (SU 1072949, US 1303213) they cannot be used for the manufacture of profiles of sheet mild steel of thickness 0.5 mm and less. Springback of sheet mild steel of thickness 0.5 mm and less practically absent. Catching elements rolls when profiling of mild steel should catch and send the profile to a closed stream formed soprikasayutsya through the profile surfaces of the upper and lower rolls, or when forming the profile is garbled.

To achieve this goal in the front rolls of the mill stand roll forming mill, designed for sheet metal forming of the piece blanks or rolled tape, calibration which is working from a closed stream forming rollers, the centering guides clamps the bottom of the roll with the distance between its inner end surfaces is equal to the width of the incoming profile accompanying the preliminary formation of the section before it enters the working stream conical elements which are additionally executed on the guides shoulders before his inner end surfaces, catching the incoming profile, conical surface and the conical elements accompanying the preliminary molding profile before getting into private work stream performed internal end surface, the distance between to the mi is equal to the width molded profile in closed caliber rolls.

The technical result, which directed the present invention, is to provide accurate onformance profiles from a piece of billet or coiled ribbon of sheet metal of a thickness of 0.5 mm and thinner at first, the process transitions to the formation of the hard-sectional profile.

The problem is solved in that the guide clamps the inner end surfaces are made with catching the incoming profile tapered surfaces, which are freely catch the incoming profile and direct it between the end guide surfaces of shoulders.

The problem is solved also by the fact that the conical elements accompanying the preliminary molding profile before getting into private work stream completed internal end surface, the distance between which is equal to the width molded profile in a closed stream rolls, making clamped between the end surfaces of the conical elements and grooves of the upper roll sheet profile purposefully brought to contact with the stream bottom and roll force is formed, as in the stamp, to the desired shape with virtually no springback unlike free flexible in known calibration rolls.

The proposed calibration rolls solves the following tasks: capture wholesalepages in rolls, direction relative to the axis of the profile, advanced profiling before getting into the work stream focused vtalkivaniya upper rollers in a work stream with limited width, forced forming predominantly in the closed stream rolls.

Delivered technical challenge moulding profile of the technological transition is solved due to the fact that in the known method, in which part of the swath profile catch, center for internal guiding of the ends of the rolls, carry out a preliminary formed on the conical surfaces of the rolls free flexible before getting into a work stream of the rolls, is the fact that the capture of the incoming profile is carried out before the centering conical guide surfaces of shoulders, and after preliminary forming free flexible conical elements roll profile purposefully pushed the upper rollers in a work stream of the rolls with the restriction on the width of the molded profile of the technological transition, and rolls molded piece billet or tape from mild steel with a thickness of 0.5 mm or thinner.

In the famous rolls profile is sent to clear the roller devices before entering the rolls of the mill, without which they are unhealthy.

Figure 1 schematically depicts a second pair of rolls; figure 2 shows a third pair of rolls; nafig depicted IV-I pair of rolls.

In the proposed roll of the first pair of rolls is not shown because it does not apply to the forming rolls, and represents guides rolls, which is known (See. RTM-105-0-210-83. The curved profiles. Typical technological processes of manufacture. NIITM. Rostov-on-don. P.106, chert, 1983).

II-I a pair of rollers performs the initial forming a curved contour profile at radii R1and R2on the corner α1. The rolls of the second pair consists of the upper rolls 1, 2, are separated along the axis of the profile on the two rolls, not necessarily symmetric, and the lower composite roll comprising a Central mold 3 and 4, separated along the axis of the profile, at catching 5 and 6. The forming rolls 1, 2, 3, 4 form a closed work stream on the line of contact of the working surface of the rolls with the profile (Cm. Whitewidow, Mpiexec. Production of cold-formed thin-walled profiles. P.20, Fig.13. Gonioctena on ferrous and nonferrous metallurgy. M., 1959). At catching the rolls 5 and 6 consist of cone catching surfaces 7 and 8, the inner guides of the ends 9 and 10 of the guide clamps 5 and 6, forming the input stream with the distance between the ends equal to the width of the input profile L1conical elements 11 and 12 of the accompanying preliminary formation of the section before it enters an indoor work stream 13, the inner Tarceva the surfaces, 14 and 15, the distance between which is equal to the width molded profile L2in calibers private stream rolls 13. Catching conical surfaces 7 and 8 are at an angle β=45...60° and are associated with the end sections 9 and 10 of the curves r1. The amount of support h of the input profile at the ends 9 and 10 depends on the design size of the input profile. The glide angle γ1and γ2on the conical elements 11 and 12 is selected to be 20...30°. The value of f plots of the ends 11 and 12 is greater than the thickness of the profiled metal. The functional designation of the rolls in the order set on the work roll from the persistent database

top 2-In-1 and 2-In-2

the lower 2-H-1; 2-H-2; 2-H-3; 2-N-4, which means. The second pair of rolls, upper or lower, the sequence number of the location from the base. Declared rolls of the second pair are as follows.

From the I-th pair of rolls of a piece or workpiece tape I is included in the II-th pair of rolls, captured conical surfaces 7 and 8 of the rolls 5 and 6 is centered by the inner ends 9 and 10 with respect to the axis of the profile, and then, reaching cone elements 11 and 12, gradual changes its form free flexible continuous contact of the edges with the surface of the cone elements to achieve the width of the L2the size of the finished profile in the transition, after which the profile is purposefully being pushed into the work stream NR 13 along the inner end surfaces 14 and 15 of the conical elements, the distance between the inner surfaces of which is equal to the width of the finished profile, where the profile is rigidly molded to obtain a curvilinear path and becomes a profile II the technological transition, which then goes in the III-th pair of rolls.

The third pair of rolls provides the following forming of the edges of the profile angle flexible α2radius R3.

Rolls III-th pair of similarly consist of upper rolls 16 and 17, separated along the axis of the profile, and lower composite, consisting of a Central molding 18 and 19 and extreme catches 20 and 21. The forming rolls 16, 17, 18 and 19 form a closed stream 22 to the line of contact between the working surfaces of the rolls with profile III. At catching the rolls 20 and 21 is made with a conical trap 23 and 24, the inner guide ends 25 and 26 of the guides of shoulders, the distance between the inner surfaces of which is equal to L2conical elements 27 and 28, accompanying the preliminary formation of the section II before it enters a work stream 22, the inner end surfaces 29 and 30, the distance between which is equal to the width molded profile L3. Catching conical surfaces 23 and 24 also performed at an angle β=45...60° and subject to sections 25 and 26 of the curves r1and parts support h1. Slip angles γ1and γ2=0...30° conical elements 27 and 28 and associated curves r2with the inner end surfaces 29 and 30 with portions of the support of f1with the distance between the ends 29 and 30, is equal to L3. The functional designation of the rolls in the III-th pair of working shafts similar to the II pair

top 3-In-1 and 3-In-2;

bottom 3-N-1; 3-N-2; 3-H-3; 3-N-4

Declared rolls III pairs of rolls are as follows.

From the second pair of rolls incoming profile II is included in the III-th pair of rolls, captured conical surfaces 23 and 24, is centered by the inner ends 25 and 26, and then, reaching cone elements 27 and 28, the pre-profiled, creeped cone-beam elements to achieve the width of the L3size of the finished profile in the transition, after which the profile on the end surfaces 29 and 30 purposefully stalkivaetsja in indoor work stream 22, where the profile is rigidly formed on edges of the profile flexible angle α2radius R3becomes the technology profile in transition III and sent to the IV-th pair of rolls.

IV pair of rolls provides a molding profile flexible angle α3radius R3.

Rolls IV-th pair consists of a top 31 and 32 and bottom 33 and 34. In this pair forming and detecting elements of the rolls are not separated.

Forming elements of the rolls 31, 32, 33, 34 form a work stream 35, an open line with the touch working surfaces of the rolls with the profile IV.

In the extreme parts of the rolls 33, 34 similarly to the previous posted tapered catching surfaces 36 and 37, the inner guides the ends 38 and 39 with the distance between them L3conical elements 40 and 41, the inner end surface of the conical elements 42 and 43 coincide with the working surface of the stream 35.

Catching tapered surfaces 36 and 37 are made in the corners β=45...60° and are associated with the end surfaces of the sections 38 and 39 of the curves r1. The size of the area of the support is equal to h2. The angle of the cone elements γ1and γ230...40°. The functional designation of the rolls in the IV pair

top 4-In-1 and 4-In-2;

the lower 4-N-1 and 4-N-2.

Declared rolls IV pairs are as follows:

From the third pair of rolls incoming profile III is included in the IV-th pair of rolls, captured tapered surfaces 36 and 37, is centered by the inner ends 38 and 39, and then, reaching the tapered elements 40 and 41, pre-profiled, creeped cone-beam elements to achieve the width of the L4size of the finished profile in the transition. After that the profile on the end surfaces 42 and 43 purposefully stalkivaetsja in work stream 35, is formed on edges of the profile flexible angle α3radius R3becomes the technology profile in the transition IV and proceed with abusou pair (not shown).

The proposed construction of the rolls as compared with the prototype has the following advantage: the capture rollers, in which the profile of the channel in the transition with all its deviations in width and direction will be included in the guide shoulders on theoretical amount, and after the preliminary forming cone elements will be included in a fixed position in a work stream and push sformula, and the amount of curl, the deviation from the shape dramatically reduced due to the reduction of springback. This is especially noticeable on asymmetric profile because the spare flexible strips gives the maximum springback.

The proposed design of the rolls in comparison with analogues thin profile due to deliberate capture, directions, pre-forming, oriented input into the work stream rolls will ensure the quality profile by eliminating deviations in the cross section profile, springback, performance and will reduce the amount of work stands in the roll forming mill.

1. Rolls front mill roll forming mill, mainly for sheet metal forming of the piece blanks or roll of tape, in particular for the manufacture of profiles tires cornices, calibration which consists of a work stream, mostly closed, forming rolls, the centering guides shoulders nor is it roll with the distance between its inner end surfaces, equal to the width of the incoming profile, conical elements accompanying the preliminary formation of the section before it enters the working stream, characterized in that the guide shoulders before his inner end surfaces made catching the incoming profile, conical surface and the conical elements accompanying the preliminary molding profile before getting into private work stream completed internal end surface, the distance between which is equal to the width molded profile in a closed stream rolls.

2. Rolls front mill roll forming mill according to claim 1, characterized in that the number of pairs of rolls in the tool kit with closed stream is equal to two.

3. The method of forming the technological transition in rolls of front mill roll forming mill in the processing sequence, including the capture of the incoming profile, centering on the inner rails of the ends of the rolls, the implementation of pre-forming on the conical surfaces of the rolls free flexible before getting into a work stream of the rolls, characterized in that the capture of the incoming profile is carried out before the centering conical guide surfaces of shoulders, and after preliminary forming free flexible conical elements roll profile C is nenapravlenie push the upper rollers in a work stream of the rolls with the restriction on the width of the molded profile of the technological transition.

4. The method of molding according to claim 2, characterized in that the molded piece blank or strip of thick mild steel ≤0,5 mm



 

Same patents:

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EFFECT: lowered metal consumption for making sections.

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Shape bending mill // 2243841

FIELD: rolled stock production.

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EFFECT: lowered production costs, enhanced quality of shapes.

3 cl, 1 dwg, 1 ex

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EFFECT: enlarged manufacturing possibilities, enhanced quality of shapes.

5 cl, 6 dwg

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EFFECT: enlarged manufacturing possibilities and increased module quantity of construction.

3 cl, 4 dwg

FIELD: plastic working of metals, possibly manufacture of shapes.

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EFFECT: elimination of tuning profiling axis at readjustment of machine.

3 dwg

FIELD: plastic working of metals.

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EFFECT: enhanced operational efficiency, simplified design of apparatus.

2 cl, 8 dwg, 2 ex

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EFFECT: enhanced quality of bent shapes due to their improved geometry, lowered costs of production process.

2 dwg, 1 ex

FIELD: rolled stock production, possibly manufacture of cold drawn shapes of sheet materials, namely coated corrugated sheets.

SUBSTANCE: apparatus includes pair of horizontal drawing rollers that are spaced one from other by preset adjustable gap. Barrels of horizontal rollers are made of fit on axle rubber rings mutually spaced by maximum vertical gap equal to maximum height of corrugations. At both sides of rollers two pairs of vertical rollers are mounted with possibility of changing distance between rollers of each pair. Distance along rolling axis between vertical rollers and axial vertical plane of horizontal rollers is selected according to given relation.

EFFECT: enhanced quality of coating, lowered costs for making shapes.

3 cl, 1 dwg, 1 ex

FIELD: rolled stock production, possibly development of shape bending mills.

SUBSTANCE: drive unit includes motor, reduction gear, power and tension gear wheels, pairs of upper and lower supports where sprockets embraced along curve by means of Gall's chain are mounted on shafts. Said supports are arranged by two mutually parallel rows; axes of all pairs of supports of mutually opposite rows are in different vertical planes. All sprockets are arranged in one vertical plane between rows of supports.

EFFECT: lowered cost of drive unit and reduced expenses for its operation.

3 cl, 2 dwg, 1 ex

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