CN110899383B - Unfolding straightening method for arc section of thin-walled cylindrical part with outer transverse ribs - Google Patents

Abstract

The invention belongs to the technical field of metal profile composite forming, and particularly relates to a method for unfolding and straightening an arc section of a thin-wall cylindrical part with an outer transverse rib, which is carried out on the basis of unfolding and straightening equipment for a wide-width high-rib thin-wall arc section; comprises the following steps: (1) adjusting the position of the straightening roll, and loading and clamping the arc-section blank: (2) feeding, pre-expanding and adjusting the biting angle of the arc-section blank; (3) and continuously unfolding and straightening. The invention realizes the clamping and feeding of the arc-segment blank and the continuous gradual deformation process of the arc-segment blank from the large-curvature arc segment to the small-curvature arc segment and then to the straight wide-width high-rib thin-wall plate on one device, and has higher efficiency; different materials are adopted at different parts of the same straightening roll, so that the straightening device can meet the requirements of unfolding and straightening of the rib plates and the thin-wall plates on the arc-section blanks; the invention can be adapted to the unfolding and straightening of the cambered wall plates with different curvatures and different thicknesses by adjusting the distance between the straightening rollers and the pressing and pressing amount, and has wide application range.

Description

Unfolding straightening method for arc section of thin-walled cylindrical part with outer transverse ribs

Technical Field

The invention belongs to the technical field of metal profile composite forming, and particularly relates to a method for unfolding and straightening an arc section of a thin-wall cylindrical part with an outer transverse rib.

Background

The high-strength high-toughness thin-wall aluminum alloy plate is widely applied in the modern high-end manufacturing fields of automobiles, ships, rail traffic, aerospace and the like. In order to meet the performance requirements of high strength, good rigidity, light weight and the like of the components, the high-strength high-toughness thin-wall aluminum alloy plate is usually fixed by reinforcing ribs. The existing fixing method for the high-strength high-toughness thin-wall aluminum alloy plate and the reinforcing rib mainly comprises two methods of welding and riveting, and the problems of large welding or riveting workload, overall weight increase, low assembly efficiency and the like are inevitably caused. The integral forming technology of the wide-width high-rib thin-wall aluminum alloy wall plate is an important development direction for solving the problems, has wide application prospect, and is a difficult problem in the section bar boundary at home and abroad.

In the aspect of preparing the aluminum alloy integral wall plate, the conventional methods comprise methods such as machining, chemical etching and milling, forming and rolling, die forging, extrusion and the like. The mechanical processing method and the chemical etching and milling method can process the metal wall plate with a complex shape, but the processing cost is high and the efficiency is low; the forming rolling method has the main advantages of high productivity and material utilization rate, but the height of the rib plate which can be rolled is limited by the process; the main disadvantage of the die forging method is that the area of the die-pressed plate and the height of the reinforcing ribs are limited by the capacity of the press; the production efficiency of the extrusion method is lower than that of a forming rolling method and a die forging method, but is much higher than that of a mechanical processing method and a chemical etching and milling method, the extrusion method is the most popular method for producing the integral wallboard with the reinforcing ribs at present, but the breadth and the height of the extruded integral wallboard are greatly influenced by the wall thickness; mojiahu, Hunan university, and the like, in the Key technology of extrusion die design for large-scale integral wall panels and hollow thin-wall aluminum profiles indicate that the width-thickness ratio of the profiles (i.e., the ratio W/t of the width W to the wall thickness t of the profiles) is an important index for representing the flattening and thinning of the profiles and is also a main index for reflecting the processing difficulty of the profiles. When W/t is less than or equal to 130, qualified products can be produced smoothly under the modern extrusion technical conditions, and when W/t is more than 130, the product quality is greatly reduced, the productivity and the yield are sharply reduced, and the production cost is greatly improved due to the reasons that the forming is difficult, the shape precision of each section size is difficult to ensure, and the like.

The Chinese invention patent with the application number of 201811180051.1 and the name of 'a 7xxx series aluminum alloy wide high-reinforcement thin-wall plate extrusion forming method' discloses a 7xxx series aluminum alloy wide high-reinforcement thin-wall plate extrusion forming method, which mainly comprises the following steps: preheating, extrusion forming, finishing treatment, splitting and unfolding. The method improves the production technology of the aluminum alloy wide-width high-rib thin-wall plate by utilizing the extrusion technology and the subdivision expansion technology of the cylindrical part with the longitudinal high rib, can obtain the wide-width high-rib thin-wall plate on a press with lower tonnage, simultaneously controls the organization performance of the material, and improves the utilization rate of the material. The method still does not break through the limitations of the extrusion process.

Liu Jing' an extrusion process scheme for the whole aluminum alloy wallboard in shallow talk lists a geometric dimension scheme for producing the wallboard by using a cylindrical circular tube method, and the practical production conditions of the method in the aspects of the maximum width, the wall thickness and the wall thickness difference of the wallboard after the wallboard is unfolded can be seen.

Geometric dimension scheme for producing wall plate by cylindrical tube method

From the actual production situation at present, although there are various novel extrusion processes which are continuously filled with the integral forming technology of the aluminum alloy wide-width high-rib thin-wall plate, the extrusion processes are limited to the limitations of equipment and processes, and the integral forming technology for producing the aluminum alloy wide-width high-rib thin-wall plate based on the extrusion technology is not easy to solve under the current conditions and has long-standing problems that: (1) large and even ultra-large extrusion equipment is required; (2) the problems of limited wall thickness and limited breadth of the flat-die extruded strip longitudinal high-rib thin-wall plate still exist; (3) the method for expanding the split longitudinal high-rib thin-wall cylindrical part of the extrusion belt of the cylinder die can improve the width of the wall plate and effectively reduce the equipment load, is generally used at present, but does not thoroughly solve the problem that the wall thickness and the width of the wall plate are limited; (3) the problems of eccentricity and failure of an extrusion die under the condition of high temperature and heavy load of large equipment, and the problems of uneven wall thickness and poor quality of the inner surface of a blank caused by the eccentricity and failure of the extrusion die; (4) the unfolding quality of the tube-die extruded strip longitudinal high-rib thin-wall tube-shaped piece after subdivision in the unfolding process can not be ensured because of the following reasons: after the thin-walled cylindrical part with the longitudinal high ribs is split, three transition areas with different wall thicknesses, namely a thin-walled plate, a reinforcing rib and the width of the bottom of the reinforcing rib, exist, the expansion of the transition areas has a complex elastic-plastic stress strain problem, and the expansion problem and the size precision problem of the transition areas are difficult to thoroughly solve by adopting simple equipment and a simple process; meanwhile, the phenomenon of uneven wall thickness caused by extrusion eccentricity, die failure and the like under the condition of high temperature and heavy load is more serious, so that the problem of difference of deformation between every two rib plates exists during unfolding, and the unfolding difficulty is aggravated because the suitable special equipment is difficult to develop for unfolding; in addition, the problem of residual stress after the wide thin-walled ribbed plate is unfolded exists. The current situation is that a thick-wall narrow-width wallboard is integrally extruded or a thick cylinder with a longitudinal inner high rib is split and unfolded, and the wall thickness of the high-rib thin-wall aluminum alloy flat wallboard is very thin, so that the wall thickness can be reduced only by a chemical etching and milling method due to the great difficulty of a wall thickness reduction machining process, but the process is complex, low in efficiency and high in cost.

Along with the development of modern manufacturing industry, the material strength is higher and higher, the wall thickness requirement of the wall plate is thinner and thinner, the appearance size and the height size of the reinforcing rib are larger and larger, the width-thickness ratio of some wall plates exceeds 300 and even reaches 800, meanwhile, the precision requirement is higher and higher, and higher requirements are provided for the manufacturing of the aluminum alloy integral wall plate. The method can not meet the increasingly high requirements of 'wide width, high rib and thin wall' by only depending on the extrusion technology, especially on the aspects of width, wall thickness, dimensional accuracy and the like. The traditional extrusion forming idea is changed, a novel forming technology is developed, the market demand of the current 'wide high-reinforcement thin-wall metal wall plate' is met, and the technical problem to be solved at present is solved urgently.

The powerful spinning is considered to be one of the most effective process methods for preparing the large-diameter thin-wall cylindrical part, and as long as the material performance allows, the process is reasonable, the requirement of thin wall is easily met, and the dimensional precision is higher; the thin-wall cylindrical part product obtained by adopting the powerful spinning process has the advantages of high forming precision, good surface smoothness, high material utilization rate, simple process equipment, small required equipment tonnage, lower cost and various mechanical properties superior to those of cutting processing. A large thin-wall cylindrical part with phi of 6700mm is produced abroad by utilizing a powerful spinning technology, a developed 1000KN large vertical powerful spinning machine is utilized domestically, a steel part with the height of 3000mm and the wall thickness of 3mm is successfully spun from a thick-wall short blank with the outer diameter of 2000mm, the wall thickness of 40mm and the height of 300mm, and the wall thickness difference reaches (3 +/-0.06) mm. The powerful spinning technology can be used for preparing large-diameter high-precision thin-wall cylindrical parts, and can also be used for producing and preparing thin-wall cylindrical parts with inner transverse ribs, outer transverse ribs and even inner longitudinal ribs by adjusting the spinning process and changing the shape of a core mold.

The high-precision large-diameter lathe can also realize the processing and preparation of the thin-wall cylindrical part with the outer transverse rib.

Related technical data are not found for the unfolding straightening equipment and the unfolding straightening process of the split arc section of the thin-wall cylindrical part with the external transverse ribs.

Disclosure of Invention

The invention aims to utilize the advantage that the prior art can easily produce a large-diameter high-precision thin-wall cylindrical part with an external transverse rib, and the invention can overcome a plurality of difficulties in the aspect of integral forming of the wide-width high-rib thin-wall metal wallboard and solve the production problem of integral forming of the wide-width high-rib thin-wall metal wallboard by utilizing the unfolding and straightening method of the arc section of the thin-wall cylindrical part with the external transverse rib provided by the invention and combining the integral forming method of the wide-width high-rib thin-wall metal wallboard and the unfolding and straightening equipment of the arc section of the thin-wall cylindrical part with the external transverse rib.

The invention provides a method for unfolding and straightening an arc section of a thin-walled cylindrical piece with an outer transverse rib, which is completed on equipment for unfolding and straightening the arc section of the thin-walled cylindrical piece with the outer transverse rib.

The unfolding straightening equipment for the arc section of the thin-walled cylindrical part with the outer transverse ribs is formed by innovatively modifying conventional multi-roller straightening equipment, comprises a mechanical rack, a straightening roller system, an electric control system, a main transmission system, a hydraulic system and a pneumatic auxiliary system, and is used for unfolding and straightening the arc section of the thin-walled cylindrical part with N1 outer transverse trapezoidal ribs before straightening, wherein N1 is a positive integer, and N1 is not less than 2;

the straightening roll system of the unfolding straightening device for the arc section of the thin-walled cylindrical part with the outer transverse ribs consists of an upper straightening roll system and a lower straightening roll system; the upper straightening roll system consists of 6 straightening rolls which are respectively named as a first roll, a second roll, a third roll, a fourth roll, a fifth roll and a sixth roll from left to right; the lower straightening roll is composed of 6 straightening rolls and is respectively named as a seventh roll, an eighth roll, a ninth roll, a tenth roll, an eleventh roll and a tenth roll from right to left; the working lengths of all the straightening rollers are equal and the two shaft ends are respectively aligned; all the straightening rollers can rotate around the axial center lines of the straightening rollers; conical thrust roller bearings are arranged at the two shaft ends of all the straightening rollers; each straightening roller of the upper straightening roller system consists of a steel inner roller and a polyurethane outer roller; each straightening roller of the upper straightening roller system is provided with N1 transverse trapezoidal grooves corresponding to the outer transverse trapezoidal ribs before straightening, and the N1 transverse trapezoidal grooves can contain the N1 outer transverse trapezoidal ribs before straightening; all straightening rollers except the first roller are driving rollers; the second roller, the third roller, the eleventh roller and the twelfth roller are respectively driven by separate speed regulating motors, can be independently hydraulically adjusted in the X, Y direction and can be independently hydraulically locked in the X, Y direction, and two shaft ends of the third roller and the tenth roller can be independently hydraulically loaded in the Y direction.

The fourth roller, the fifth roller and the sixth roller jointly form a seven-roller upper straightening roller system, the seventh roller, the eighth roller, the ninth roller and the tenth roller jointly form a seven-roller lower straightening roller system, and the seven-roller upper straightening roller system and the seven-roller lower straightening roller system form a seven-roller straightening roller system; the seven-roller upper straightening roller system comprises straightening rollers, wherein the straightening rollers are positioned at the same horizontal position in the Y direction and are uniformly distributed and arranged in the X direction at an interval of L1; two shaft ends of each straightening roller of the seven-roller upper straightening roller system are fixed in the X, Y direction; the seven-roller lower straightening roller system and each straightening roller of the seven-roller upper straightening roller system are arranged in an X-direction staggered distance mode, the staggered distance amount is (L1)/2, two shaft ends of each straightening roller of the seven-roller lower straightening roller system are fixed in the X direction, and can be independently hydraulically adjusted in the Y direction and independently hydraulically locked; each straightening roller of the seven-roller straightening roller system is driven by a speed regulating motor with a gear distribution box and a universal transmission shaft.

The third roller, the tenth roller and the eleventh roller form a nip angle adjusting roller system together; the X-direction distance between the eleventh roller and the tenth roller is L2; the X-direction distance between the third roller and the fourth roller is L3.

The second roller, the eleventh roller and the twelfth roller form a pre-unfolding roller system together; the X-direction distance between the tenth roller and the eleventh roller is L4; the X-direction distance between the second roller and the third roller is L5.

The first roller, the twelfth roller and two sets of pinch roller adjusting devices arranged at the shaft ends of the two sides form a pinch roller system together; the pinch roll adjusting device is composed of a screw, a nut, two semi-ring hoops, a rectangular sliding block, a force bearing frame, an air cylinder and a pinch roll frame.

The unfolding and straightening method for the arc section of the thin-walled cylindrical part with the outer transverse ribs is used for unfolding and straightening the arc section (hereinafter referred to as arc section blank) of the thin-walled cylindrical part with the N1 before-straightening outer transverse trapezoidal ribs on the basis of the unfolding and straightening equipment for the arc section of the thin-walled cylindrical part with the outer transverse ribs, and comprises the following steps of:

(C-1) adjusting the position of a straightening roller and loading and clamping the arc-section blank:

(C-1-1) adjusting the system pressure of the lower seven-roller straightening roller: pressing and adjusting the seven-roller lower straightening roller system according to the thickness of the arc-section blank, wherein the seven-roller lower straightening roller system is pressed against the seven-roller upper straightening roller system to be aligned to a zero position, and the pressing amount of each straightening roller of the seven-roller lower straightening roller system is adjusted, so that the seven-roller straightening roller system can realize a straightening function, and two shaft ends of each straightening roller of the seven-roller lower straightening roller system are hydraulically locked in a Y direction independently after adjustment is completed;

(C-1-2) loading the arc-segment blank: adjusting the pinch roll system to loosen the first roll; the X, Y-direction positions of the second roller, the third roller, the eleventh roller and the tenth roller are independently and hydraulically adjusted according to the shape and the size of the arc-segment blank, so that the arc-segment blank can be placed in the X, Y-direction positions, and the following conditions are met: an upper quadrant point C of the arc-segment blank is positioned on a Y-direction central line of the third roller, the arc-segment blank and the tenth roller are tangent to a point F, the arc-segment blank and the second roller are tangent to a point B, and the arc-segment blank and the twelfth roller are tangent to a point H; the distances between the arc-segment blank and the first roller, between the arc-segment blank and the eleventh roller and between the arc-segment blank and the third roller are delta 2, delta 3 and delta 4 respectively; the distances delta 2, delta 3 and delta 4 are all larger than 0, so that smooth loading of the arc-section blank is facilitated; the distance between the point F and the inner end point E of the right end of the arc-section blank is delta 5, the delta 5 is slightly larger than 0, and delta 5 is required to ensure that the outer end point D of the right end of the arc-section blank is not contacted with the fourth roller; the distances L2 and L3 are required to ensure that the biting angle adjusting roller system can effectively play a role in adjusting the biting angle of the arc-segment blank, and the distances L4 and L5 are required to ensure that the pre-spreading roller system can effectively play a role in pre-spreading the arc-segment blank; meanwhile, the distances L2, L3, L4 and L5 are required to ensure that the subsequent continuous unfolding straightening process can be smoothly carried out;

(C-1-3) clamping the pinch roll system: adjusting the position of the screw of the pinch roll system and the pressure in the cylinder to enable the first roll and the tenth roll to clamp the arc-section blank, enabling the H point, the A point, the M point, the N point and the O point to be on the same straight line, and then locking the first roll; the point A is a contact point of the first roller and the arc-section blank, the points M and N are respectively central points of the first roller and the twelfth roller when the pinch roller system is initially clamped, and the point O is an arc central point of the arc-section blank;

(C-1-4) pre-contacting the third roll with the arc segment blank: the third roller is pressed down to be in contact with the arc-section blank at the point C under the hydraulic loading in the Y direction;

(C-1-5) locking: after adjustment is completed, two shaft ends X of the third roller and the tenth roller are independently hydraulically locked, and two shaft ends X, Y of the second roller and the eleventh roller are independently hydraulically locked;

(C-2) arc-segment blank feeding, pre-expanding and biting angle adjusting: starting straightening equipment to enable each straightening roller to be in an operating state, clamping and feeding the arc-section blank under the action of the pinch roller system, hydraulically driving two shaft ends of the third roller to be pressed down in a Y-direction hydraulic loading manner, wherein the stroke is delta 6, meanwhile, pressing the pinch roller system in the Y-direction hydraulic loading manner to enable the twelfth roller to move upwards, the stroke is delta 7, so that the arc-section blank is deformed to be the deformed arc-section blank, the points A ', B', C ', K', F ', G' and H 'are respectively contact points of the first roller, the second roller, the third roller, the fourth roller, the tenth roller, the eleventh roller and the tenth roller, the points D', E 'and J' are respectively a right end outer end point, a right end inner end point and a left end inner end point of the deformed arc-section blank, the points M 'and N' are respectively central points of the first roller and the tenth roller after the arc-section blank is deformed, the O ' point is the arc center of the undeformed arc segment J ' H '; in the deformation process, the deformed arc-segment blank is clamped and fed under the action of the first roller and the twelfth roller, the arc-segment H 'G' is subjected to pre-unfolding deformation, the biting angle of the arc-segment F 'E' is adjusted through deformation of the arc-segment G 'F', and the clamping feeding, the pre-unfolding and the biting angle adjustment of the deformed arc-segment blank are simultaneously realized through the process; meanwhile, under the action of the pinch roll system, the A ' point, the H ' point, the M ' point, the N ' point and the O ' point are always kept on the same straight line; the δ 3, δ 6 and δ 7 should satisfy the following conditions: in the subsequent straightening process, the undeformed arc section J 'H', the pre-expanded arc section H 'G', the angle adjusting arc section G 'F' and the bite arc section F 'E' are in smooth transition and accord with the metal deformation principle; meanwhile, the biting arc section F 'E' needs to meet the biting conditions of the fourth roller and the ninth roller; in the step, because the delta 3 is a preset size, if the deviation exists, the Y-direction hydraulic locking at two shaft ends of the eleventh roller can be firstly released, and the hydraulic locking is independently performed again after the position is hydraulically adjusted again; after the strokes delta 6 and delta 7 are properly adjusted, the two shaft ends of the eleventh roller and the twelfth roller are hydraulically locked in the Y direction;

(C-3) continuous unfolding straightening: after the step (C-2) is finished, the deformed arc-section blank is continuously unfolded, straightened and deformed under the action of each straightening roller until the unfolding and straightening process is finished, and the preformed wide high-rib thin-wall plate is produced;

the unfolding straightening method for the arc section of the thin-wall cylindrical part with the outer transverse ribs not only can be used for unfolding and straightening the arc section of the thin-wall cylindrical part with the N1 before-straightening outer transverse trapezoidal ribs prepared by the method, but also can be used for unfolding and straightening the arc section of the thin-wall cylindrical part with the outer transverse ribs processed by other methods.

The unfolding and straightening method for the arc section of the thin-wall cylindrical part with the outer transverse ribs can not only aim at aluminum alloy materials, but also be used for other metal materials which can be used for straightening.

The invention has the advantages and positive effects that:

(1) compared with the existing profile straightening process, the existing profile straightening equipment and process basically straighten the straight-line type conventional profile, and do not relate to the special profile, in particular to the unfolding straightening equipment and process of the arc section of the thin-wall cylindrical part with the external transverse rib;

(2) the invention improves the pinch roll mechanism of the traditional multi-roll straightener, innovatively designs a pinch roll system, and can ensure that the first roll and the twelfth roll of the pinch roll system can always keep the radian of the thin-wall cylindrical part arc-section blank with the external transverse rib to be adapted under the combined action of the gravity of the first roll, the thrust of an air cylinder and the thin-wall cylindrical part arc-section blank with the external transverse rib, so that the pinch roll system meets the clamping feeding process requirement in the unfolding and straightening processes;

(3) the invention adds the pre-unfolding roller system, improves the biting angle adjusting roller system, adopts a large deformation scheme in the pre-unfolding stage to realize pre-unfolding, adopts a smaller deformation scheme in the subsequent biting angle adjusting roller system to ensure that the pre-unfolding roller system and the biting angle adjusting roller system are coordinated and matched with each other, and solves the deformation process problem of pre-unfolding and biting angle coordination;

(4) when the thin-wall cylindrical part arc-section blank with the external transverse ribs is unfolded and straightened, straightening rollers with different rigidity are adopted for unfolding and straightening of the rib plate with good rigidity and the thin-wall plate with poor rigidity, so that the unfolding and straightening requirements are met, and the tearing phenomenon caused by too large difference between the size and the rigidity of the rib plate and the thin-wall plate can be prevented; in addition, a method that one rib plate is adopted for guiding and other rib plates are allowed to have certain play in the spacing direction of the rib plates is adopted, so that the wrinkling instability phenomenon of the thin-wall plate can be prevented;

(5) the invention can adapt to the expansion and straightening of thin-wall cylindrical part arc-segment blanks with different curvatures and different thicknesses and with external transverse ribs by adjusting the X-direction spacing and the Y-direction pressing down amount among the straightening rollers of the pinch roll system, the pre-expansion roll system, the bite angle adjusting roll system and the seven-roller straightening roll system, and has wide application range;

(6) the invention improves and innovates the traditional straightening equipment and process on the basis of absorbing the advantages of the traditional multi-roll straightening equipment and process, through the coordination of the pinch roll system, the pre-spreading roll system, the bite angle adjusting roll system and the seven-roll straightening roll system, the clamping and feeding of the thin-walled cylindrical arc-shaped blank with the external transverse ribs and the continuous gradual deformation process of the thin-walled cylindrical arc-shaped blank with the external transverse ribs from the large-curvature arc section to the small-curvature arc section and then to the straight wide-width high-rib thin-walled plate are realized on one device, meanwhile, the multi-function of clamping feeding, pre-expanding, biting angle adjusting, straightening and the like are completed, so that the multi-function thin-wall cylindrical part straightening machine can meet the requirements of expanding and straightening arc-section blanks of thin-wall cylindrical parts with external transverse ribs, the application range of the traditional multi-roll straightening equipment and technology is widened, the occupied area is small, the investment is small, and the efficiency is high.

Drawings

FIG. 1 is a schematic view of a preform according to the present invention;

FIG. 2 is a schematic view of a screw-on barrel blank according to the present invention;

FIG. 3 is a schematic view of a spin-on sleeve blank according to the present invention;

FIG. 4 is a schematic view of a machined barrel blank according to the present invention;

FIG. 5 is a schematic view of the cutting and splitting of the machined cylinder blank according to the present invention, wherein the machined cylinder blank is split into 3 sections;

FIG. 6 is a front view of the pre-formed wide-width high-rib thin-wall plate obtained after unfolding and straightening according to the present invention, wherein a two-dot chain line is an outline of an arc section of the thin-wall cylindrical part with N1 before unfolding and straightening and outer transverse trapezoidal ribs;

FIG. 7 is a left side view of the pre-formed wide high-rib thin-wall plate obtained after unfolding and straightening according to the present invention, wherein a two-dot chain line indicates an outer contour of an arc segment of the thin-wall cylindrical part with N1 pre-straightening outer transverse trapezoidal ribs before unfolding and straightening;

FIG. 8 is a front view of the wide, high-rib, thin-walled metal wall panel of the present invention;

FIG. 9 is a left side view of the wide high-rib thin-walled metal wall panel of the present invention;

FIG. 10 is a schematic view of the construction of a straightening roll of the present invention, and is also a cross-sectional view Q-Q of FIG. 13;

FIG. 11 is a schematic view showing the position of the straightening roll and the state of the arc-shaped blank after being loaded;

FIG. 12 is a schematic view of the arc segment blank feed, pre-deployment, and instantaneous state prior to the start of bite angle adjustment in accordance with the present invention;

fig. 13 is a schematic view of the arc-segment blank after the adjustment of the feeding, pre-spreading and biting angles is completed, wherein the two-dot chain lines are respectively the instantaneous position profiles of the third roller and the twelfth roller before the adjustment of the feeding, pre-spreading and biting angles is started;

FIG. 14 is a schematic view of the present invention in a continuously unfolded straightened state;

fig. 11 to 14 are cross-sectional T-T views of fig. 10 in respective working states;

FIG. 15 is a schematic structural view of the pinch roll system after the position adjustment of the straightening roll and the installation of the arc-segment billet and when the pinch roll system is not clamped according to the present invention;

FIG. 16 is a schematic structural view of the pinch roll system after the arc billet feeding, pre-expanding and bite angle adjustment of the present invention is completed;

FIG. 17 is a schematic structural view of the bearing frame in the pinch roll system of the invention;

FIG. 18 is a schematic view of a pinch roll system P according to the present invention in a partial view.

Detailed Description

The following detailed description of the present invention, taken in conjunction with the accompanying drawings and examples, is provided to enable the invention and its various aspects and advantages to be better understood. However, the specific embodiments and examples described below are for illustrative purposes only and are not limiting of the invention.

The term "connected", as used herein, unless otherwise expressly specified or limited, is to be construed broadly, as meaning either directly or through an intermediate connection. In the description of the present invention, it is to be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "upper", "middle", "lower", etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 9, a certain wide high-rib thin-wall metal wall plate 7 is made of an aluminum alloy, the width requirement is that B is 1000mm, the length is that L is 1000mm, the wall thickness is that T is 2mm, the rib height is that T 'is 28mm, the number of ribs is 2, the ribs are symmetrically distributed in the width direction, and the rib spacing B' is 600mm, and the method for integrally forming the wide high-rib thin-wall metal wall plate of the present embodiment includes the following steps:

(A-1) preparing a cylinder blank 4: and preparing a machined cylinder blank 4 which meets the requirements of the subsequent process and is provided with N1 machined transverse trapezoidal ribs 4-1, wherein N1 is 2 in the embodiment.

(A-2) dissection cutting: according to the subsequent unfolding and straightening requirements and the length requirements of the wide high-rib thin-wall metal wall plate 7, the machined cylindrical blank 4 is cut into 3 thin-wall cylindrical arc sections 5 with 2 pre-straightening outer transverse trapezoidal ribs 5-1 along the axis direction, the arc length of the thin-wall cylindrical arc section 5 with 2 pre-straightening outer transverse trapezoidal ribs 5-1 is S larger than or equal to 1030mm and larger than B, the height is H4-1040 mm, the wall thickness is T4-2 mm, the rib height is T4 '-30 mm, and the rib spacing is H4' -600 mm.

(A-3) heat treatment before development and straightening: and (3) carrying out pre-unfolding straightening heat treatment on the arc section 5 of the thin-wall cylindrical piece with 2 pre-straightening outer transverse trapezoidal ribs 5-1 according to the requirements of a subsequent unfolding straightening process.

(A-4) unfolding straightening: based on the unfolding straightening equipment for the arc section of the thin-wall cylindrical part with the outer transverse ribs, the unfolding straightening method for the arc section of the thin-wall cylindrical part with the outer transverse ribs is adopted, 3 sections of the arc section 5 of the thin-wall cylindrical part with 2 outer transverse trapezoidal ribs 5-1 before being unfolded and straightened are respectively unfolded and straightened into a preformed wide-width high-rib thin-wall plate 6, the width of the preformed wide-width high-rib thin-wall plate is B6 ═ 1040mm, the length of the preformed wide-width high-rib thin-wall plate is L6 ≥ 1030mm, the wall thickness of the preformed wide-width high-rib thin-wall plate 6 is T6 ═ 2mm, the height of the preformed wide-width high-rib thin-wall plate 6 is T6 ≈ 30mm, and the rib spacing is B6 ═ 600 mm;

(A-5) subsequent process treatment: finishing a subsequent heat treatment process according to the preparation process requirement of the wide-width high-rib thin-wall metal wall plate 7, and then adding 2 corrected outer transverse trapezoidal ribs 6-1 on 3 sections of the preformed wide-width high-rib thin-wall plate 6 into the shape of a rib plate 7-1 required by the wide-width high-rib thin-wall metal wall plate 7 through a local machine; finally, cutting off the allowance to manufacture the required wide-width high-rib thin-wall metal wall plate 7, wherein the width is 1000mm, the length is 1000mm, the wall thickness is 2mm, the rib height is 28mm, and the rib distance is 600 mm;

in the step (a-2), the machined cylindrical blank 4 is split and cut along the axial direction into 3 thin-walled cylindrical arc sections 5 with 2 pieces of external transverse trapezoidal ribs 5-1 before straightening, so that the subsequent step (a-4) is smoothly performed for unfolding and straightening, in the embodiment, N2 is 3, and if the process permission of unfolding and straightening in the subsequent step (a-4) is adopted, N2 is 1;

the integral forming method of the wide-width high-rib thin-wall metal wall plate can be used for aluminum alloy materials and other metal materials;

the step (A-1) of preparing the cylinder blank can adopt a method of adding the cylinder blank by a spinning process, and comprises the following steps:

(A-1-1-1) preform: the method comprises the following steps of preliminarily preparing an aluminum alloy hot blank into a prefabricated barrel blank 1 with 2 outer transverse trapezoidal ribs 1-1 by adopting a forging process, wherein the inner diameter of the prefabricated barrel blank 1 is d1 phi 985mm, the height of the prefabricated barrel blank is H1 phi 350mm, the wall thickness of the prefabricated barrel blank is T1 which is more than or equal to 25mm, the rib height T1 'of each outer transverse trapezoidal rib 1-1 is more than or equal to 22mm, and the rib spacing H1' is 160 mm;

(A-1-1-2) pronation heat treatment: carrying out pre-spinning heat treatment on the prefabricated barrel blank 1 according to the spinning process requirement, and cooling to room temperature;

(A-1-1-3) pronation machining: machining the prefabricated barrel blank 1 subjected to pre-spinning heat treatment according to the spinning process requirement to prepare a pre-spinning barrel blank 2 meeting the subsequent spinning process requirement, wherein the inner diameter of the pre-spinning barrel blank 2 is d2 phi 1000mm, the height is H2 phi 320mm, the wall thickness is T2 phi 10mm, 2 pre-spinning outer transverse trapezoidal ribs 2-1 are arranged on the pre-spinning barrel blank 2, the rib height of the pre-spinning outer transverse trapezoidal ribs 2-1 is T2 '22 mm, and the rib spacing is H2' 160 mm;

(A-1-1-4) spinning: spinning the rotary front barrel blank 2 into a rotary rear barrel blank 3, wherein the rotary rear barrel blank 3 is a thin-wall long barrel with 2 rotary rear outer transverse trapezoidal ribs 3-1, and two ends of the rotary rear barrel blank are provided with spinning process remainders 3-2; the height of the rotary barrel blank 3 is H3-1100 mm, the wall thickness is T3-2 mm, the rib height T3 'of the rotary outer transverse trapezoidal rib 3-1 is 30mm, the rib spacing H3' is 600mm, 3-4 times of rotary pressing are carried out in the rotary pressing process according to the requirements of a rotary pressing deformation process, and the middle of the rotary pressing is subjected to rotary pressing middle heat treatment according to the requirements of the rotary pressing process;

(A-1-1-5) post-rotation machining: cutting off the spinning process residual heads 3-2 at the two ends of the spun cylinder blank 3, and locally trimming the 2 spun outer transverse trapezoidal ribs 3-1 into 2 machined outer transverse trapezoidal ribs 4-1 so as to meet the requirements of the subsequent unfolding and straightening processes to prepare a machined cylinder blank 4; the height of the machined cylinder blank 4 is H4 ═ 1040mm, the wall thickness is T4 ═ 2mm, H4 is < H3, the rib height of the machined outer transverse trapezoidal rib 4-1 is T4 ═ 30mm, and the rib spacing is H4 ═ 600 mm;

in the steps (a-1-1-3) and (a-1-1-4), the outer diameter side of the 2 rotationally-forward outer transverse trapezoidal ribs 2-1 may not participate in the spinning process (i.e., the outer diameter may remain unchanged), so that the whole process may meet the high rib requirement as long as the ribs of the rotationally-forward outer transverse trapezoidal ribs 2-1 of the rotationally-forward barrel blank 2 are high enough;

the step (A-1-1-4) can be carried out not only at room temperature, but also under the condition of material property permission, selecting temperature deformation or thermal deformation;

the method for preparing the cylinder blank 4 by the step (A-1) can also be a method for preparing the cylinder blank by a cutting process, and comprises the following steps:

(A-1-2-1) preform: the method comprises the following steps of preliminarily preparing an aluminum alloy hot blank into a prefabricated barrel blank 1 with 2 outer transverse trapezoidal ribs 1-1 by adopting a forging process, wherein the inner diameter of the prefabricated barrel blank 1 is d1 phi 985mm, the height of the prefabricated barrel blank is H1 phi 1080mm, the wall thickness of the prefabricated barrel blank is T1 which is more than or equal to 25mm, the rib height of the 2 outer transverse trapezoidal ribs 1-1 is T1 'which is more than or equal to 22mm, and the rib spacing is H1' which is more than or equal to 600 mm;

(A-1-2-2) Pre-cutting Heat treatment: performing pre-cutting heat treatment on the prefabricated barrel blank 1 according to the requirements of a subsequent processing technology, and cooling to room temperature;

(A-1-2-3) cutting: preparing the prefabricated cylinder blank 1 subjected to heat treatment before cutting into the machined cylinder blank 4 by using a cutting processing method, wherein the inner diameter of the machined cylinder blank 4 is d4 phi 1000mm, the height of the machined cylinder blank is H4 phi 1040mm, the wall thickness of the machined cylinder blank is T4 phi 2mm, 2 machined transverse trapezoidal ribs 4-1 are arranged on the machined cylinder blank 4, 2 machined transverse trapezoidal ribs 4-1 meet the requirements of a subsequent unfolding straightening process, the rib height of each machined transverse trapezoidal rib is T4 '30 mm, and the rib spacing is H4' 600 mm; because the wall thickness reduction amount is large in the machining process, the machining hardening is serious, and 3-4 times of intermediate heat treatment is needed in the machining process.

The step (A-4) of unfolding and straightening is carried out by adopting the unfolding and straightening method of the arc section of the thin-wall cylindrical piece with the outer transverse rib, which is disclosed by the invention, based on the unfolding and straightening equipment of the arc section of the thin-wall cylindrical piece with the outer transverse rib, which is disclosed by the invention.

The embodiment also provides unfolding and straightening equipment for the arc section of the thin-walled cylindrical part with the outer transverse ribs, which is formed by innovatively modifying conventional multi-roll straightening equipment, the basic structure and the principle of the unfolding and straightening equipment are similar to those of the conventional multi-roll straightening equipment, and the unfolding and straightening equipment comprises a mechanical rack, a straightening roll system, an electric control system, a main transmission system, a hydraulic system and a pneumatic auxiliary system, and is used for unfolding and straightening the arc section of the thin-walled cylindrical part with the N1 before-straightening outer transverse trapezoidal ribs (in the embodiment, N1 is 2), but the unfolding and straightening equipment is different from the conventional multi-roll straightening equipment in structure characteristics:

(B-1) As shown in FIGS. 10 to 14, the straightening roll system of the present invention is composed of an upper straightening roll system and a lower straightening roll system; the upper straightening roll system consists of 6 straightening rolls which are respectively named as a first roll G1, a second roll G2, a third roll G3, a fourth roll G4, a fifth roll G5 and a sixth roll G6 from left to right; the lower straightening roll system consists of 6 straightening rolls which are respectively named as a seventh roll G7, an eighth roll G8, a ninth roll G9, a tenth roll G10, an eleventh roll G11 and a twelfth roll G12 from right to left; the working length of all the straightening rollers is B8-1100 mm, B8 is greater than H4, and the working lengths are respectively aligned at two axial ends; all the straightening rollers can rotate around the axial center lines of the straightening rollers; the upper straightening roll system is positioned above the lower straightening roll system; the thin-wall cylindrical arc section 5 or deformed arc section blank 5A with 2 pre-straightening outer transverse trapezoidal ribs 5-1 (in the embodiment, the embodiment shown in FIG. 10 is that the thin-wall cylindrical arc section 5 with 2 pre-straightening outer transverse trapezoidal ribs 5-1 is deformed in the subsequent straightening and flattening process and is called a deformed arc section blank 5A) is positioned between the upper straightening roll system and the lower straightening roll system; both ends of each straightening roller (in the embodiment, the fourth roller G4 is taken as an example in the figure 10) of the upper straightening roller system are provided with shaft ends 8-1-1 which can be provided with conical thrust roller bearings; each straightening roller of the upper straightening roller system consists of a steel inner roller 8-1-2 and a polyurethane outer roller 8-1-4, each straightening roller of the upper straightening roller system is provided with 2 transverse trapezoidal grooves corresponding to the outer transverse trapezoidal ribs 5-1 before straightening, the 2 transverse trapezoidal grooves can contain the 2 outer transverse trapezoidal ribs 5-1 before straightening, the distance between the 2 transverse trapezoidal grooves is equal to the distance between the 2 outer transverse trapezoidal ribs 5-1 before straightening, H4' is 600mm, the diameter of the bottom of each transverse trapezoidal groove is D120 mm, one of the 2 transverse trapezoidal grooves is a guide groove 8-1-3, the guide effect is realized in the unfolding straightening process, the shape and the size of the transverse trapezoidal groove are matched with the outer transverse trapezoidal ribs 5-1 before straightening, the other transverse trapezoidal groove is a non-guide groove 8-1-5, the width of the non-guide groove 8-1-5 is slightly greater than the width of the pre-correction outer transverse trapezoidal rib 5-1 and is symmetrically distributed along the center line of the non-guide groove 8-1-5, in this embodiment, the width of the non-guide groove 8-1-5 is wider than the width of the pre-correction outer transverse trapezoidal rib 5-1 by δ 1 ═ 2mm along both sides of the center line of the non-guide groove 8-1-5; the outer diameter of each straightening roller of the upper straightening roller system is D +2 xT 4 ═ 120+2 x30 ═ 180 mm; each straightening roll of the lower straightening roll system (in the embodiment, the tenth roll G10 is taken as an example) is made of steel, and the outer diameter of each straightening roll is 120 mm; both ends of each straightening roll of the lower straightening roll system are provided with shaft ends 8-2-1 capable of being provided with conical thrust roller bearings; all the straightening rollers except the first roller G1 are driving rollers, wherein the second roller G2, the third roller G3, the eleventh roller G11 and the twelfth roller G12 are respectively driven by separate speed regulating motors, and the fourth roller G4, the fifth roller G5, the sixth roller G6, the seventh roller G7, the eighth roller G8, the ninth roller G9 and the tenth roller G10 are driven by a speed regulating motor with a gear distribution box and a universal transmission shaft.

(B-2) as shown in fig. 11 to 14, the fourth roll G4, the fifth roll G5, and the sixth roll G6 constitute a seven-roll upper straightening roll system together; the seventh roller G7, the eighth roller G8, the ninth roller G9 and the tenth roller G10 form a seven-roller lower straightening roller system together; the seven-roller upper straightening roller system and the seven-roller lower straightening roller system form a seven-roller straightening roller system; the seven-roller upper straightening roller system is characterized in that all straightening rollers are in the same horizontal position in the Y direction and are uniformly distributed and arranged in the X direction, the distance is L1, and in the embodiment, L1 is 200 mm; two shaft ends of each straightening roller of the seven-roller upper straightening roller system are fixed in the X, Y direction; the seven-roller lower straightening roller system and the seven-roller upper straightening roller system are arranged in an X-direction staggered manner, the staggered distance amount is (L1)/2-100 mm, two shaft ends of each straightening roller of the seven-roller lower straightening roller system are fixed in the X direction, and can be independently hydraulically adjusted in the Y direction and independently hydraulically locked.

(B-3) As shown in FIGS. 11 to 14, the third roll G3, the tenth roll G10 and the eleventh roll G11 constitute a nip angle adjusting roll system together; the third roller G3 and the eleventh roller G11 are positioned at the left end of the seven-roller straightening roller system, and the X-direction distance between the eleventh roller G11 and the tenth roller G10 is L2; the X-direction distance between the third roller G3 and the fourth roller G4 is L3, and L3 is (L1+ L2)/2; the two shaft ends of the third roller G3 can be independently hydraulically loaded in the Y direction, and the two shaft ends of the third roller G3 and the eleventh roller G11 can be independently hydraulically adjusted in the X, Y direction and independently hydraulically locked in the X, Y direction.

(B-4) as shown in fig. 11 to 14, the second roller G2, the eleventh roller G11 and the twelfth roller G12 constitute a pre-unwinding roller train together; the second roller G2 and the twelfth roller G12 are positioned at the left end of the biting angle adjusting roller system, and the X-direction distance between the twelfth roller G12 and the eleventh roller G11 is L4; the X-direction distance between the second roller G2 and the third roller G3 is L5, L5 is more than or equal to (L4+ L5)/2, two shaft ends of the twelfth roller G12 can be independently hydraulically loaded in the Y direction, and two shaft ends of the second roller G2 and the twelfth roller G12 can be independently hydraulically adjusted in the X, Y direction and can be independently hydraulically locked in the X, Y direction.

(B-5) as shown in FIGS. 15 to 18, the first roller G1, the twelfth roller G12 and two sets of pinch roller adjusting devices 9 arranged at two shaft ends jointly form a pinch roller system; the pinch roll adjusting device 9 consists of a screw rod 9-1, a nut 9-2, two semi-ring hoops 9-3, a rectangular sliding block 9-4, a force bearing frame 9-5, an air cylinder 9-6 and a pinch roll frame 9-7; the rectangular sliding block 9-4 is of a rectangular structure, the middle part of the rectangular sliding block is provided with a conical thrust roller bearing A9-4-1; the bearing frame 9-5 is a closed frame, the middle part of the upper end of the closed frame is provided with a threaded through hole 9-5-1, the middle part of the closed frame is provided with a rectangular hole 9-5-2, the lower end of the closed frame is provided with a semicircular bearing cross beam provided with a bearing B9-5-5, two side surfaces of the rectangular hole 9-5-2 are provided with sliding grooves 9-5-3, and the outer side of the bearing frame 9-5 is provided with an upper cylinder support 9-5-4; the pinch roll frame 9-7 is formed by welding a double-lug bearing seat 9-7-1, a cylinder lower support 9-7-2 and a bottom plate 9-7-3, and two conical thrust roller bearings 9-7-4 are installed in the double-lug bearing seat 9-7-1; the rectangular sliding block 9-4 arranged in the rectangular hole 9-5-2 can slide in the sliding groove 9-5-3; the lower end of the screw rod 9-1 is provided with a cylindrical step 9-1-1, and the cylindrical step 9-1-1 is clamped and connected with the rectangular sliding block 9-4 by the two semi-ring hoops 9-3; the screw rod 9-1 is matched with the threaded through hole 9-5-1; the shaft end at one side of the first roller G1 is inserted into the conical thrust roller bearing A9-4-1; the relative position of the screw 9-1 and the force bearing frame 9-5 is adjusted, so that the position of the rectangular sliding block 9-4 in the rectangular hole 9-5-2 can be adjusted, and the first roller G1 is driven to realize the loosening and clamping of the thin-wall cylindrical arc section 5 with 2 straightening front transverse trapezoidal ribs; after the adjustment is proper, the nut 9-2 can lock the screw rod 9-1; the lower end of the bearing frame 9-5 is inserted into the double-trunnion bearing seat 9-7-1, the shaft end on one side of the twelfth roller G12 is inserted into the double-trunnion bearing seat 9-7-1 provided with two conical thrust roller bearings C9-7-4, and the middle of the bearing seat is assembled with the bearing B9-5-5; the air cylinder 9-6 is arranged between the air cylinder upper support 9-5-4 and the air cylinder lower support 9-7-2, the internal pressure of the air cylinder 9-6 is adjustable and is used for balancing the force acting on the air cylinder upper support 9-5-4, and under the action of the air cylinder force, the force bearing frame 9-5 can drive the first roller G1 to rotate along the center line of the twelfth roller G12 within a certain range, so that the clamping feeding requirement in the unfolding and straightening processes is met; the two shaft ends of the twelfth roller G12 can be independently hydraulically loaded in the Y direction, independently hydraulically adjusted in the X, Y direction and independently hydraulically locked in the X, Y direction under the action of the two sets of pinch roller frames 9-7.

The unfolding straightening in the step (A-4) is carried out by adopting a unfolding straightening method of the arc section of the thin-wall cylindrical piece with the outer transverse rib on the basis of the unfolding straightening equipment of the arc section of the thin-wall cylindrical piece with the outer transverse rib.

The embodiment also provides a method for unfolding and straightening the arc section of the thin-walled cylindrical part with the outer transverse ribs, which is used for unfolding and straightening the arc section of the thin-walled cylindrical part with the N1 before-straightening outer transverse trapezoidal ribs on the basis of the device for unfolding and straightening the arc section of the thin-walled cylindrical part with the outer transverse ribs, wherein the arc section of the thin-walled cylindrical part with the N1 before-straightening outer transverse trapezoidal ribs is unfolded and straightened and is hereinafter referred to as an arc section blank, and N1 in the embodiment is 2, and the method comprises the following steps:

(C-1) adjusting the position of a straightening roll, and loading and clamping the arc-segment blank 5: as in fig. 11, 12 and 15:

(C-1-1) adjusting the system pressure of the lower seven-roller straightening roller: pressing and adjusting the seven-roller lower straightening roller system according to the thickness of the arc-section blank 5, wherein the seven-roller lower straightening roller system is pressed against the seven-roller upper straightening roller system to be in a zero-alignment position, and the pressing amount of each straightening roller of the seven-roller lower straightening roller system is adjusted, so that the seven-roller straightening roller system can realize a straightening function, and two shaft ends of each straightening roller of the seven-roller lower straightening roller system are hydraulically locked in a Y direction independently after adjustment is completed;

(C-1-2) charging the arc segment blank 5: adjusting the pinch roll system to loosen the first roll G1; the X, Y-direction positions of the second roller G2, the third roller G3, the eleventh roller G11 and the twelfth roller G12 are independently hydraulically adjusted according to the shape and the size of the arc-segment blank 5, so that the arc-segment blank 5 can be placed in the position, and the following conditions are met: the upper quadrant point C of the arc-segment blank 5 is positioned on the Y-direction central line of the third roller G3, the arc-segment blank 5 and the tenth roller G10 are tangent to a point F, the arc-segment blank 5 and the second roller G2 are tangent to a point B, and the arc-segment blank 5 and the twelfth roller G12 are tangent to a point H; the distances between the arc-segment blank 5 and the first roller G1, the eleventh roller G11 and the third roller G3 are delta 2, delta 3 and delta 4 respectively; the distances delta 2, delta 3 and delta 4 are all larger than 0, so that smooth loading of the arc-section blank 5 is facilitated; the distance between the point F and the right end inner end point E of the arc-segment blank 5 is delta 5, the delta 5 is slightly larger than 0, and delta 5 is required to ensure that the right end outer end point D of the arc-segment blank 5 is not contacted with the fourth roller G4; the distances L2 and L3 are required to ensure that the biting angle adjusting roller system can effectively play a role in adjusting the biting angle of the arc-segment blank, and the distances L4 and L5 are required to ensure that the pre-spreading roller system can effectively play a role in pre-spreading the arc-segment blank; meanwhile, the distances L2, L3, L4 and L5 are required to ensure that the subsequent continuous unfolding straightening process can be smoothly carried out; in this embodiment, the distance L2 ═ 250mm, L3 ═ L1+ L2)/2 ═ 225mm, L4 ═ 250mm, L5 ═ 300mm, δ 2 > 50mm, δ 3 ≈ 12.5mm, δ 4 > 50mm, and δ 5 ≈ 20 mm;

(C-1-3) clamping the pinch roll system: adjusting the position of the screw rod 9-1 of the pinch roll system and the pressure in the air cylinder 9-6, enabling the first roller G1 and the tenth roller G12 to clamp the arc section blank 5, enabling the H point and the A point, the M point and the N point to be in a straight line with the O point, and then locking the first roller G1; the point A is a contact point of the first roller G1 and the arc-segment blank 5, the points M and N are central points of the first roller G1 and a twelfth roller G12 when the pinch roll system is initially clamped, and the point O is an arc central point of the arc-segment blank 5;

(C-1-4) said third roller G3 is pre-contacted with said arc segment blank 5: the third roller G3 is in contact with the arc-segment blank 5 at the point C under the hydraulic loading and pressing in the Y direction;

(C-1-5) locking: after adjustment is completed, the two shaft ends X of the third roller G3 and the twelfth roller G12 are independently hydraulically locked, and the two shaft ends X, Y of the second roller G2 and the eleventh roller G11 are independently hydraulically locked;

(C-2) feeding, pre-expanding and biting angle adjusting of the arc-segment blank 5: as shown in fig. 12, 13 and 16, the straightening device is started to make the straightening rollers in operation, the arc-shaped blank 5 is clamped and fed by the pinch roller system, the two shaft ends of the third roller G3 are hydraulically driven to be pressed down in the Y direction, the stroke is delta 6, meanwhile, the pinch roller system is hydraulically pressed in the Y direction, the tenth roller G12 moves upwards, the stroke is delta 7, so that the arc-shaped blank 5 in fig. 12 is deformed into the deformed arc-shaped blank 5A in fig. 13, points a ', B', C ', K', F ', G' and H 'in the figure are the contact points of the first roller G1, the second roller G2, the third roller G3, the fourth roller G4, the tenth roller G10, the eleventh roller G11 and the twelfth roller G12, and points D', E 'and J' are the contact points of the outer end points of the right end of the deformed arc-shaped blank 5A, A right-end inner end point and a left-end inner end point, wherein the M ' point and the N ' point are respectively central points of the first roller G1 and the twelfth roller G12 after the arc-segment blank 5 is deformed, and the O ' point is an arc center of an undeformed arc segment J ' H '; in the above deformation process, the deformed arc-segment blank 5A is clamped and fed by the first roller G1 and the twelfth roller G12, the arc-segment H 'G' is pre-spread and deformed, the deformation of the arc-segment G 'F' adjusts the biting angle of the arc-segment F 'E', and the above process simultaneously achieves the clamping feeding, pre-spreading and biting angle adjustment of the deformed arc-segment blank 5A; meanwhile, under the action of the pinch roll system, the A ' point, the H ' point, the M ' point, the N ' point and the O ' point are always kept on the same straight line; the δ 3, δ 6 and δ 7 should satisfy the following conditions: in the subsequent straightening process, the undeformed arc section J 'H', the pre-expanded arc section H 'G', the angle adjusting arc section G 'F' and the bite arc section F 'E' are in smooth transition and accord with the metal deformation principle; meanwhile, the biting arc section F 'E' needs to meet the biting conditions of the fourth roller G4 and the ninth roller G9; in this step, since δ 3 is a preset size, if there is a deviation, the Y-direction hydraulic lock at both shaft ends of the eleventh roller G11 can be released first, and the hydraulic lock can be released again after the position is hydraulically adjusted again; after the strokes delta 6 and delta 7 are properly adjusted, the Y-direction hydraulic locking is carried out on the two shaft ends of the eleventh roller G11 and the twelfth roller G12; in the embodiment, the stroke delta 3 is approximately equal to 12.5mm, the stroke delta 6 is approximately equal to 20mm, and the stroke delta 7 is approximately equal to 100 mm;

(C-3) continuous unfolding straightening: after the step (C-2) is completed, as shown in fig. 13, 14 and 16, the deformed arc-segment blank 5A is continuously unfolded, straightened and deformed under the action of each straightening roller until the unfolding and straightening process is completed, and the preformed wide high-rib thin-wall plate 6 is produced;

the unfolding straightening method for the arc section of the thin-walled cylindrical piece with the outer transverse ribs can not only be used for unfolding and straightening the arc section 5 of the thin-walled cylindrical piece with the N1 before-straightening outer transverse trapezoidal ribs 5-1 prepared by the method, but also be used for unfolding and straightening the arc section of the thin-walled cylindrical piece with the outer transverse ribs processed by other methods.

The unfolding and straightening method for the arc section of the thin-wall cylindrical part with the outer transverse ribs can not only aim at aluminum alloy materials, but also be used for other metal materials which can be used for straightening.

It should be noted that the above-mentioned embodiments described with reference to the drawings are only intended to illustrate the present invention and not to limit the scope of the present invention, and it should be understood by those skilled in the art that modifications and equivalent substitutions can be made without departing from the spirit and scope of the present invention. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.

Claims (5)

1. A method for unfolding and straightening arc sections of thin-wall cylindrical parts with external transverse ribs is completed on the basis of unfolding and straightening equipment provided with 12 straightening rollers, used for unfolding and straightening the arc section of the thin-wall cylindrical piece with N1 transverse trapezoidal ribs before straightening to produce a preformed wide-width high-rib thin-wall plate, the arc sections of the thin-wall cylindrical piece with the N1 corrected front outer transverse trapezoidal ribs are hereinafter referred to as arc section blanks for short, N1 is a positive integer, N1 is more than or equal to 2, it is characterized in that the unfolding straightening equipment comprises an upper straightening roll system and a lower straightening roll system, the upper straightening roll system consists of 6 straightening rolls, a first roll (G1) to a sixth roll (G6) are arranged from left to right, the lower straightening roll system consists of 6 straightening rolls, a seventh roll (G7) to a tenth roll (G12) are respectively arranged from right to left, and the upper straightening roll system is positioned above the lower straightening roll system;

the fourth roller (G4), the fifth roller (G5) and the sixth roller (G6) jointly form an upper seven-roller straightening roller system, the seventh roller (G7), the eighth roller (G8), the ninth roller (G9) and the tenth roller (G10) jointly form a lower seven-roller straightening roller system, the third roller (G3), the tenth roller (G10) and the eleventh roller (G11) jointly form a bite angle adjusting roller system, the second roller (G2), the eleventh roller (G11) and the tenth roller (G12) jointly form a pre-expansion roller system, and the first roller (G1), the tenth roller (G12) and two sets of roller adjusting devices (9) arranged at two side shaft ends jointly form a pinch roller system;

the unfolding straightening method of the arc section of the thin-wall cylindrical part with the outer transverse ribs comprises the following steps:

(C-1) adjusting the position of a straightening roller, and loading and clamping the arc-section blank (5);

(C-2) feeding, pre-expanding and bite angle adjusting the arc-segment blank (5);

(C-3) continuously unfolding and straightening;

wherein the step (C-1) of adjusting the position of the straightening roll and the step of loading and clamping the arc-shaped blank (5) comprises the following steps:

(C-1-1) adjusting the system pressure of the lower seven-roller straightening roller: pressing and adjusting the seven-roller lower straightening roller system according to the thickness of the arc-section blank (5), wherein the seven-roller lower straightening roller system is pressed against the seven-roller upper straightening roller system to be aligned to a zero position, the pressing amount of each straightening roller of the seven-roller lower straightening roller system is adjusted, so that the seven-roller straightening roller system can realize a straightening function, and two shaft ends of each straightening roller of the seven-roller lower straightening roller system are hydraulically locked in a Y direction independently after adjustment is completed;

(C-1-2) loading the arc section blank (5): adjusting the pinch roll train to release the first roll (G1); independently hydraulically adjusting the positions X, Y of the second roller (G2), the third roller (G3), the eleventh roller (G11) and the twelfth roller (G12) according to the shape and size of the arc-segment blank (5), so that the arc-segment blank (5) can be placed in the positions, and the following conditions are met: the upper quadrant point C of the arc-segment blank (5) is positioned on the Y-direction central line of the third roller (G3), the arc-segment blank (5) and the tenth roller (G10) are tangent to the point F, the arc-segment blank (5) and the second roller (G2) are tangent to the point B, and the arc-segment blank (5) and the tenth roller (G12) are tangent to the point H; the distances between the arc-segment blank (5) and the first roller (G1), the eleventh roller (G11) and the third roller (G3) are delta 2, delta 3 and delta 4 respectively; the distances delta 2, delta 3 and delta 4 are all larger than 0, so that smooth loading of the arc-section blank (5) is facilitated; the distance between the point F and the inner end point E of the right end of the arc-section blank (5) is delta 5, the delta 5 is slightly larger than 0, and delta 5 is required to ensure that the outer end point D of the right end of the arc-section blank (5) is not contacted with the fourth roller (G4); the X-direction distance between the eleventh roller (G11) and the tenth roller (G10) is L2, the X-direction distance between the third roller (G3) and the fourth roller (G4) is L3, and the X-direction distance between the tenth roller (G12) and the eleventh roller (G11) is L4; the X-direction distance between the second roller (G2) and the third roller (G3) is L5, the distances L2 and L3 are required to ensure that the biting angle adjusting roller system can effectively play a role in adjusting the biting angle of the arc-segment blank, and the distances L4 and L5 are required to ensure that the pre-spreading roller system can effectively play a role in pre-spreading the arc-segment blank; meanwhile, the distances L2, L3, L4 and L5 are required to ensure that the subsequent continuous unfolding straightening process can be smoothly carried out;

(C-1-3) clamping the pinch roll system: adjusting the position of a screw rod (9-1) of a pinch roll adjusting device (9) of the pinch roll system and the pressure in an air cylinder (9-6), so that the first roll (G1) and a twelfth roll (G12) clamp the arc section blank (5), the H point, the A point, the M point, the N point and the O point are in a straight line, and then the first roll (G1) is locked; the point A is a contact point of the first roller (G1) and the arc-segment blank (5), the points M and N are central points of the first roller (G1) and the twelfth roller (G12) when the pinch roller system is initially clamped, and the point O is an arc-segment central point of the arc-segment blank (5);

(C-1-4) said third roller (G3) being pre-contacted with said arc segment blank (5): the third roller (G3) is contacted with the arc-segment blank (5) at a point C under the hydraulic loading and pressing in the Y direction;

(C-1-5) locking: after the adjustment is finished, the X-direction of two shaft ends of the third roller (G3) and the tenth roller (G12) are independently hydraulically locked, and the X-direction of two shaft ends X, Y of the second roller (G2) and the eleventh roller (G11) are independently hydraulically locked.

2. The method for straightening and unfolding an arc of a thin-walled cylindrical member with an external transverse rib according to claim 1, wherein the step (C-2) of feeding, pre-unfolding and adjusting the biting angle of the arc blank (5) comprises the steps of:

starting straightening equipment to enable each straightening roller to be in a running state, clamping and feeding the arc-section blank (5) under the action of the pinch roller system, hydraulically driving two shaft ends of the third roller (G3) to be pressed down in a Y-direction hydraulic loading mode, wherein the stroke is delta 6, meanwhile, pressing the pinch roller system in the Y-direction hydraulic loading mode to enable the twelfth roller (G12) to move upwards in a delta 7 mode, so that the arc-section blank (5) is deformed into a deformed arc-section blank (5A), points A ', B', C ', K', F ', G' and H 'are contact points of the first roller (G1), the second roller (G2), the third roller (G3), the fourth roller (G4), the tenth roller (G10), the eleventh roller (G11) and the tenth roller (G12) and the deformed arc-section blank (5A), and points D', E 'and J' are contact points of the right end point of the deformed arc-section blank (5A) outside respectively, A right-end inner end point and a left-end inner end point, wherein the M ' point and the N ' point are respectively the central points of the first roller (G1) and the twelfth roller (G12) after the arc-segment blank (5) is deformed, and the O ' point is the arc center of an undeformed arc segment J ' H '; during the deformation process, the deformed arc-segment blank (5A) is clamped and fed under the action of the first roller (G1) and the twelfth roller (G12), the arc-segment H 'G' is subjected to pre-unfolding deformation, the deformation of the arc-segment G 'F' adjusts the biting angle of the arc-segment F 'E', and the clamping feeding, the pre-unfolding and the biting angle adjustment of the deformed arc-segment blank (5A) are simultaneously realized; meanwhile, under the action of the pinch roll system, the A ' point, the H ' point, the M ' point, the N ' point and the O ' point are always kept on the same straight line; the δ 3, δ 6 and δ 7 should satisfy the following conditions: in the subsequent straightening process, the undeformed arc section J 'H', the pre-expanded arc section H 'G', the angle adjusting arc section G 'F' and the bite arc section F 'E' are in smooth transition and accord with the metal deformation principle; meanwhile, the biting arc section F 'E' needs to meet the biting conditions of the fourth roller (G4) and the ninth roller (G9); in the step, because the delta 3 is a preset size, if the deviation exists, the Y-direction hydraulic locking at the two shaft ends of the eleventh roller (G11) can be firstly released, and the hydraulic locking can be independently performed again after the position is hydraulically adjusted again; after the strokes delta 6 and delta 7 are properly adjusted, the Y-direction hydraulic locking of the two shaft ends of the eleventh roller (G11) and the twelfth roller (G12) is realized.

3. A method for straightening and unfolding an arc section of a thin-walled cylindrical member with an outer transverse rib according to claim 2, wherein the step (C-3) of continuously straightening and unfolding comprises the steps of: the deformed arc section blank (5A) is continuously unfolded and straightened under the action of each straightening roller until the unfolding and straightening process is finished, and a preformed wide-width high-rib thin-wall plate (6) is produced.

4. The method of straightening an arc of a thin-walled cylindrical member with an outer transverse rib according to claim 1, wherein the method is applied to an aluminum alloy material.

5. The method of straightening out an arc of a thin-walled cylindrical member with external transverse ribs according to claim 1, wherein the method is applied to a metallic material.

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