Forming die for automobile longitudinal beam roll-pressed outer web surface without indentation

Abstract

The utility model discloses a kind of forming die of automobile longitudinal beam roll-pressing outer web surface without indentation, can gradually process and manufacture into U-shaped beam with strip steel, this set of die is composed of sixteen pass roller groups, first fix web surface, then gradually roll-pressing into 90 degrees by gradually changing from 0 ° to wing surface, then overbend stress relief, finally wing surface is shaped at 90 degrees.Changing the traditional practice that the inner vertical surface of upper web surface roller is a line, on the basis of guaranteeing roll shape effect, the inner vertical surface of upper web surface roller in different pass is staggered in layers, fundamentally solve the problem that indentation is formed in the same position of the outer cylindrical surface inner side surface of upper web surface roller repeatedly roll-pressing the web surface of U-shaped beam.

Description

Technical Field

[0001] This utility model relates to the field of automobile frame longitudinal beam production technology, specifically a forming mold for rolling automobile longitudinal beams without indentations on the outer surface. Background Technology

[0002] In the field of chassis longitudinal beam manufacturing, the production processes for chassis longitudinal beams vary depending on the type of vehicle. Currently, the production of chassis longitudinal beams for heavy-duty commercial vehicles generally involves roll forming → three-sided punching of U-shaped beams → laser or plasma cutting → bending. In contrast, the production of chassis longitudinal beams for traditional light-duty trucks typically employs a process of flatbed punching → laser or plasma cutting → press molding. However, with the continuous evolution of market demands and increasingly higher requirements for the speed of product upgrades in light-duty trucks, the traditional production process for light-duty truck chassis longitudinal beams has impacted the speed of new product launches. To reduce the R&D, manufacturing, and production cycles of new products, domestic commercial vehicle light-duty truck chassis longitudinal beam manufacturers are also experimenting with roll forming to improve production efficiency and product quality.

[0003] Meanwhile, with the development of the times and the advancement of technology, lightweighting of automobiles has become an inevitable trend in the industry. To achieve lightweighting goals, it is necessary to increase the strength of the materials used in the longitudinal beams of the chassis on the one hand, and reduce the material weight on the other, which leads to a continuous reduction in the cross-sectional dimensions of the longitudinal beams. In the process of producing lightweight longitudinal beams using roll forming technology, the size of the roll forming die needs to be correspondingly reduced, and the contact area between the die and the longitudinal beam also decreases. This results in a more concentrated pressure distribution on the outer surface of the longitudinal beam during roll forming, making the indentation problem on the outer surface of the longitudinal beam more pronounced after roll forming. Indentations not only affect the appearance quality of the longitudinal beam but may also have a potential impact on its mechanical properties and service life. Therefore, how to effectively solve the indentation problem on the outer surface of the longitudinal beam during the roll forming process of light truck chassis has become a key technical challenge that urgently needs to be addressed in the current commercial vehicle chassis longitudinal beam manufacturing field. Utility Model Content

[0004] The purpose of this invention is to provide a forming mold for rolling an automotive longitudinal beam without indentations on the outer surface. By arranging sixteen rollers in the mold frame, indentations can be avoided on the outer surface during the longitudinal beam forming process, thus solving the problems in the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a forming mold for rolling an automotive longitudinal beam without indentation on its outer surface, comprising a mold frame, in which sixteen roll groups are installed, each roll group having a horizontally arranged upper spindle and lower spindle, wherein the first to tenth roll groups each include two sets of first upper surface rolls arranged side by side, the first upper surface rolls being mounted on the upper spindle and rotating synchronously with the upper spindle, each first upper surface roll having a first upper wing roll that can rotate relative to it, the first upper wing rolls being fitted around the outer circumference of the upper spindle, and a lower spindle with side by side being mounted on the lower spindle at the bottom of the first upper surface rolls. Two sets of first lower web rolls are used. The bending angle of the first upper flange rolls in the first to tenth roll groups gradually increases. The eleventh and twelfth roll groups each include two sets of second upper web rolls arranged side-by-side. The second upper web rolls are mounted on the upper spindle and rotate synchronously with it. Two sets of second lower web rolls are mounted side-by-side on the lower spindle at the bottom of the second upper web rolls. A horizontally rotating second upper flange roll is mounted on the die frame between the second upper and lower web rolls. The rotation axis of the second upper flange roll is perpendicular to the rotation axis of the second upper web roll. The bending angle of the second upper flange roll... The bending angle is less than 90 degrees and greater than that of the first upper flange roll in the tenth roll group; the thirteenth to sixteenth roll groups all include a third upper web roll mounted on the upper main shaft. The third upper web roll can rotate synchronously with the upper main shaft. Two sets of third lower web rolls are mounted side by side on the lower main shaft at the bottom of the third upper web roll. A third upper flange roll that can rotate horizontally is mounted on the die frame between the third upper web roll and the third lower web roll. The rotation axis of the third upper flange roll is arranged perpendicular to the rotation axis of the third upper web roll. The bending angle of the third upper flange roll in the thirteenth and sixteenth roll groups is 90 degrees. In the fourteenth and fifteenth roll groups, the bending angle of the third upper wing roll is greater than 90 degrees. The outer circumference of the third upper wing roll is arranged to match the side of the third lower wing roll. In the first roll group, the width of the first upper wing rolls on both sides is the same. In the second roll group, the first upper wing rolls on both sides are arranged with the left side wider and the right side narrower. In the third roll group, the first upper wing rolls on both sides are arranged with the left side narrower and the right side wider. In the fourth roll group, the width of the first upper wing rolls on both sides is the same. From the fourth to the twelfth roll group, the width of the upper wing rolls on both sides is arranged alternately according to the arrangement pattern of the first three roll groups. An upper spacer is fitted on the upper main shaft on one side of the first upper wing roll. The first upper wing roll is mounted on the outer circumference of the upper spacer via bearings, and the first upper wing roll can rotate relative to the first upper wing roll.A lower spacer is fitted onto the lower main shaft on one side of the first lower web roll. In the first to fourth roll groups, the first lower web roll and the lower spacer are two combined components, while in the fifth to tenth roll groups, the first lower web roll and the lower spacer are a single integrated component. The bending angle of the first upper wing roll in the first to tenth roll groups gradually increases from 0 to 80 degrees, with each first upper wing roll's bending angle being 7-8 degrees larger than the previous first upper wing roll. The bending angle of the second upper wing roll in the twelfth roll group is greater than that of the second upper wing roll in the eleventh roll group, and is 80-85 degrees. The bending angle of the third upper wing roll in the fourteenth roll group is 95-96 degrees, and the bending angle of the third upper wing roll in the fifteenth roll group is 92-93 degrees. In the thirteenth roll group, the cross-section of the third upper abdominal roll is an outwardly convex elliptical shape, and the outer circumference of the third lower abdominal rolls on both sides of the thirteenth roll group is inclined towards the middle position of the roll group. The third upper web roll in the thirteenth roll set can be vertically raised and lowered relative to the die frame. Vertical movement mechanisms are installed on both sides of the die frame of the thirteenth roll set. Each vertical movement mechanism includes a vertical movement slide. The die frame is provided with a vertical movement guide rail that cooperates with the vertical movement slide. A pressing screw is installed on the vertical movement slide. A support is installed on the die frame above the vertical movement slide. A nut sleeve that cooperates with the pressing screw is installed in the support. The nut sleeve is installed in the support through a pressure cover. A worm wheel is provided on the outer periphery of the nut sleeve. A worm gear that meshes with the worm wheel is installed in the support. A first drive motor is installed on the die frame on one side of the support. The output shaft of the first drive motor is connected to the worm gear. The third upper web roll is installed between the two vertical movement slides. When the first drive motor is started, it can drive the third upper web roll to rise and fall vertically. The third upper flange roll in the fourteenth and fifteenth roll groups can move closer to or further away from the third lower flange roll. A transverse oscillating mechanism is installed on both sides of the mold frame of the fourteenth and fifteenth roll groups. Each transverse oscillating mechanism includes an oscillating seat. The third upper flange roll is mounted on the oscillating seat via a rotating shaft. One end of the oscillating seat is mounted on the mold frame via a hinged seat, and the other end of the oscillating seat is equipped with a push rod. Corresponding to the position of the push rod, a guide support seat is installed on the mold frame. A nut sleeve rod that can move along the length direction is fitted inside the guide support seat. A second drive motor is installed at one end of the guide support seat. A push screw that cooperates with the nut sleeve rod is provided on the output shaft of the second drive motor. One end of the nut sleeve rod is connected to the push screw, and the other end of the nut sleeve rod passes through the guide support seat and is connected to the push rod. When the second drive motor starts, it can drive the oscillating seat to rotate around the hinged seat.

[0006] The positive effects of this utility model are as follows: The forming mold for rolling the outer surface of an automotive longitudinal beam without indentations, as described in this utility model, can gradually process strip steel into a U-shaped beam. This mold consists of sixteen sets of rollers. First, the outer surface is fixed, then the flange is gradually rolled from 0° to 90°, then stress is relieved by bending, and finally the flange is shaped at 90°. This changes the traditional practice of having a straight inner surface of the upper outer surface roller. While ensuring the roller shape effect, the inner surfaces of the upper outer surface rollers in different passes are staggered in layers, fundamentally solving the problem of indentations caused by repeated rolling of the inner surface of the outer circle of the upper outer surface roller against the same position on the outer surface of the U-shaped beam.

[0007] Through the ingenious arrangement and coordinated operation of the sixteen roll groups, the formation of indentations on the outer web surface can be significantly reduced or avoided during the longitudinal beam forming process. The reasonable combination of the upper web rolls, lower web rolls, and upper flange rolls in each roll group, along with the gradual change in bending angle, ensures that the longitudinal beam is subjected to uniform stress during the rolling process, avoiding indentation caused by excessive local pressure. This greatly improves the appearance quality and mechanical properties of the longitudinal beam.

[0008] The molding die of this invention, through optimized design of the roller group, can adapt to the production needs of longitudinal beams with different cross-sectional dimensions. In particular, for the production of lightweight longitudinal beams, it can effectively solve the indentation problem caused by the reduction in die size, providing strong support for the development of automotive lightweight technology. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 This is a schematic diagram of the structure of the sixteen-roll mill group in this utility model;

[0011] Figure 3 yes Figure 2 Side view of the middle structure;

[0012] Figure 4 yes Figure 3 Sectional view along line AA;

[0013] Figure 5 yes Figure 3 Sectional view along the BB direction;

[0014] Figure 6 yes Figure 4 A magnified view of part of I;

[0015] Figure 7 This is a cross-sectional view of the first rolling mill set;

[0016] Figure 8 This is a cross-sectional view of the fourth roll group;

[0017] Figure 9 This is a cross-sectional view of the fifth roll group;

[0018] Figure 10 This is a cross-sectional view of the eighth roll group;

[0019] Figure 11 This is a cross-sectional view of the tenth roll group;

[0020] Figure 12 This is a cross-sectional view of the eleventh rolling mill group;

[0021] Figure 13 This is a cross-sectional view of the thirteenth rolling mill group;

[0022] Figure 14 This is a cross-sectional view of the fourteenth roll group;

[0023] Figure 15 This is a cross-sectional view of the sixteenth roll group;

[0024] Figure 16 This is a schematic diagram of the structure of the vertical movement mechanism installed on the mold frame on both sides of the thirteen-roll mill group;

[0025] Figure 17 This is a partial sectional view of a single-sided vertical movement mechanism;

[0026] Figure 18 This is a schematic diagram of the structure of the transverse swing mechanism installed on the mold frame on both sides of the fourteenth roll group;

[0027] Figure 19 yes Figure 18 An enlarged view of the sectional view along the CC direction;

[0028] Figure 20 This is a physical structural diagram of the machining mechanism for the thirteenth to sixteenth roll groups. Detailed Implementation

[0029] This utility model describes a molding die for forming an automotive longitudinal beam without indentations on its outer surface using roller pressing. Figure 1-5 As shown, the machine includes a mold frame 1, within which sixteen roll sets are installed. Each roll set is equipped with a horizontally arranged upper spindle 2 and lower spindle 3. The rotation of the upper spindle 2 and lower spindle 3 drives the sixteen roll sets to rotate, thereby extruding the strip steel workpiece into a U-shaped beam. Each upper spindle 2 and lower spindle 3 can be driven by a separate motor, or a transmission device such as a gear rack, sprocket, or chain can be installed within the mold frame 1, driving all the spindles to rotate through a single motor, providing the power source for the fabrication of the longitudinal beam.

[0030] like Figure 7-11As shown, each of the first to tenth roll groups includes two sets of first upper web rolls 4 arranged side by side. The first upper web rolls 4 are mounted on the upper main shaft 2 and can rotate synchronously with the upper main shaft 2 to extrude the upper web of the longitudinal beam. Each first upper web roll 4 is equipped with a first upper flange roll 5 that can rotate relative to it. The first upper flange roll 5 is fitted around the outer circumference of the upper main shaft 2 to extrude and form half of the longitudinal beam. Two sets of first lower web rolls 6 are arranged side by side on the lower main shaft 3 at the bottom of the first upper web rolls 4 to support and shape the bottom of the workpiece web. The bending angle of the first upper flange rolls 5 gradually increases from the first to the tenth roll groups.

[0031] The structures of the first to tenth roll groups are the same, except that they need to handle the gradual shape processing of the workpiece. This requires the bending angle of the first upper wing roll 5 to be different. The first upper wing roll 4 can be used as the active component for forward conveying of the workpiece. Since the bending angle of the first upper wing roll 5 is different, the contact area and rotational linear speed between it and the workpiece are also different. Therefore, it needs to be used as the driven component to follow the workpiece to prevent scratches on the workpiece.

[0032] like Figure 12 As shown, both the eleventh and twelfth roll groups include two sets of second upper web rolls 7 arranged side by side. The second upper web rolls 7 are mounted on the upper main shaft 2 and can rotate synchronously with the upper main shaft 2 to extrude and form the top surface of the web of the longitudinal beam. Two sets of second lower web rolls 8 are mounted side by side on the lower main shaft 3 at the bottom of the second upper web rolls 7 to support and shape the bottom of the web of the workpiece.

[0033] A second upper wing roll 9, which can rotate horizontally, is installed on the mold frame 1 between the second upper wing roll 7 and the second lower wing roll 8. The rotation axis of the second upper wing roll 9 is arranged perpendicular to the rotation axis of the second upper wing roll 7. The bending angle of the second upper wing roll 9 is less than 90 degrees and greater than the bending angle of the first upper wing roll 5 in the tenth roll group.

[0034] The eleventh and twelfth roll groups have the same structure. The bending angle of the second upper wing roll 9 needs to gradually increase. As the workpiece is made from strip steel to U-beam, the bending angle approaches 90 degrees. If the upper web roll and the upper wing roll are still on the same axis, the upper wing roll will produce different linear velocities at different shaft diameters, resulting in a significant difference in linear velocity. However, the wing surfaces of the U-beam workpiece require the same linear velocity. Therefore, the rotation axis of the upper wing roll is changed from horizontal to vertical. The position of the second upper wing roll 9 is more in line with the actual roll forming process and is beneficial to the forming of the U-beam.

[0035] like Figure 13-15As shown, the thirteenth to sixteenth roll groups all include a third upper web roll 10 mounted on the upper main shaft 2. The third upper web roll 10 can rotate synchronously with the upper main shaft 2. Here, the third upper web roll 10 is a complete cylindrical wheel, which is different from the upper web rolls of the first to twelfth roll groups. The contact extrusion on the top of the workpiece web is a complete surface, and no indentation will be generated.

[0036] Two sets of third lower abdominal rolls 11 are arranged side by side on the lower main shaft 3 at the bottom of the third upper abdominal roll 10. A third upper wing roll 12 that can rotate horizontally is installed on the mold frame 1 between the third upper abdominal roll 10 and the third lower abdominal roll 11. The rotation axis of the third upper wing roll 12 is arranged perpendicular to the rotation axis of the third upper abdominal roll 10.

[0037] The bending angle of the third upper flange roll 12 in the thirteenth and sixteenth roll groups is 90 degrees, while the bending angle of the third upper flange roll 12 in the fourteenth and fifteenth roll groups is greater than 90 degrees. The outer circumference of the third upper flange roll 12 is arranged to match the side of the third lower web roll 11. The thirteenth roll group initially compresses the flange of the U-beam to a 90-degree state. The fourteenth and fifteenth roll groups perform over-pressure processing on the flange of the U-beam. The sixteenth roll group reshapes and compresses the flange of the U-beam workpiece to 90 degrees. This arrangement allows the web and flange of the U-beam workpiece to be closer to 90 degrees after its own deformation and rebound.

[0038] like Figure 4 and Figure 6 As shown, in the first roll group, the width of the first upper abdominal roll 4 on both sides is the same. In the second roll group, the width of the first upper abdominal roll 4 on both sides is wider on the left and narrower on the right. In the third roll group, the width of the first upper abdominal roll 4 on both sides is narrower on the left and wider on the right. In the fourth roll group, the width of the first upper abdominal roll 4 on both sides is the same. From the fourth to the twelfth roll group, the width of the upper abdominal rolls on both sides is arranged alternately according to the arrangement pattern of the first three roll groups. From the thirteenth to the sixteenth roll groups, the upper abdominal roll is a single pressure roller without any distinction between narrow and wide sides, which allows for a smoother extrusion process on the top surface of the web of the U-shaped beam workpiece. Through the above structural arrangement, the narrow and wide upper abdominal rolls can eliminate the indentations produced by extrusion, thus solving the problem at its source the indentations generated on the top surface of the web during the workpiece manufacturing process by the inner surface of the upper abdominal rolls.

[0039] In this invention, the first upper web roll 4 and the first upper flange roll 5 of the first ten roll groups are both mounted on the upper main shaft 2. Because when rolls of different diameters rotate around the main shaft axis, the larger the diameter, the faster the linear velocity of the roll. However, the strip roll as a whole rolls forward at the same speed. This means the actively rotating first upper flange roll 5 is prone to scratching the strip. Therefore, the first upper flange roll 5 needs to be modified to a driven rotating structure, rather than rotating synchronously with the first upper web roll 4. To achieve this, the first upper flange roll 5 acts as a follower mechanism for the workpiece. An upper spacer 13 is fitted on the upper main shaft 2 on one side of the first upper web roll 4. The first upper flange roll 5 is mounted on the outer periphery of the upper spacer 13 via a bearing 14, allowing the first upper flange roll 5 to rotate relative to the first upper web roll 4.

[0040] Furthermore, a lower spacer 15 can be fitted onto the lower main shaft 3 on one side of the first lower abdominal roll 6. The spacer 15 is fitted onto the outer periphery of the lower main shaft 3. The first lower abdominal roll 6 and the lower spacer 15 in the first to fourth roll groups are two combined components, while the first lower abdominal roll 6 and the lower spacer 15 in the fifth to tenth roll groups are one integrated component. Since the bending angle of the workpiece in the first five roll groups is relatively small, a split structure can be adopted. The bending angle of the workpiece in the fifth to tenth roll groups is relatively large, and the extrusion force on the first lower abdominal roll 6 is also relatively large. Adopting an integrated structure can effectively improve the strength and positioning stability of the first lower abdominal roll 6.

[0041] Furthermore, the bending angle of the first upper wing roll 5 in the first to tenth roll groups gradually increases from 0 to 80 degrees, and the bending angle of the first upper wing roll 5 in each roll group can be 7-8 degrees larger than the bending angle of the first upper wing roll 5 in the previous roll group. For example, the bending angles of the first upper wing roll 5 in the first to tenth roll groups are 0 degrees, 8 degrees, 16 degrees, 24 degrees, 32 degrees, 40 degrees, 48 ​​degrees, 56 degrees, 64 degrees and 80 degrees respectively.

[0042] Furthermore, the bending angle of the second upper wing roll 9 in the twelfth roll group is greater than that of the second upper wing roll 9 in the eleventh roll group, and the bending angle of the second upper wing roll 9 can be 80-85 degrees.

[0043] Furthermore, the bending angle of the third upper wing roll 12 in the fourteenth roll group can be 95-96 degrees, and the bending angle of the third upper wing roll 12 in the fifteenth roll group can be 92-93 degrees. That is, the overpressure angle of the fourteenth roll group on the workpiece wing is 5-6 degrees, and the overpressure angle of the fifteenth roll group on the workpiece wing is 2-3 degrees. This ensures that after the workpiece wing is overpressed, the sixteenth roll group can then achieve 90-degree shaping and extrusion of the workpiece wing.

[0044] Furthermore, the cross-section of the third upper abdominal roll 10 in the thirteenth roll group can be an outwardly convex elliptical shape, and the outer peripheral surfaces of the third lower abdominal rolls 11 on both sides of the thirteenth roll group are inclined towards the middle position of the roll group. The above structure allows the third upper abdominal roll 10 to apply overpressure to the top of the web of the workpiece that has been initially formed into a 90-degree wing surface, so that after the U-shaped beam workpiece has its own deformation and rebound, its abdominal surface and wing surface are closer to 90 degrees.

[0045] Furthermore, the third upper web roll 10 in the thirteenth roll set can be vertically raised and lowered relative to the die frame 1. Overpressure operation on the web surface of the workpiece is achieved through the vertical raising and lowering of the third upper web roll 10. Vertical movement mechanisms are installed on both sides of the die frame 1 of the thirteenth roll set, such as... Figure 16 and Figure 17 As shown, each vertical movement mechanism includes a vertical movement slide 16, and the mold frame 1 is provided with a vertical movement guide rail 17 that cooperates with the vertical movement slide 16. A pressing screw 18 is installed on the vertical movement slide 16.

[0046] A support 19 is mounted on the mold frame 1 on the upper side of the vertical sliding slide 16. A nut sleeve 20 that mates with the pressing screw 18 is installed inside the support 19. The nut sleeve 20 is installed inside the support 19 via a pressure cap 21. A worm gear 22 is provided on the outer periphery of the nut sleeve 20. A worm 23 that meshes with the worm gear 22 is installed inside the support 19. A first drive motor 24 is mounted on the mold frame 1 on one side of the support 19. The output shaft of the first drive motor 24 is connected to the worm 23. A third upper web roll 10 is installed between the two vertical sliding slides 16.

[0047] After the first drive motor 24 starts, it drives the wire nut sleeve 20 to rotate through the transmission of the worm 23 and worm wheel 22. The rotation of the wire nut sleeve 20 can drive the pressing screw 18 to rise and fall vertically. Under the guidance of the vertical moving guide rail 17, the vertical moving slides 16 on both sides can move vertically, thereby realizing the vertical rising and falling of the third upper web roll 10.

[0048] Furthermore, the third upper flange roll 12 in the fourteenth and fifteenth roll groups can move closer to or further away from the third lower flange roll 11. Overpressure operation on the workpiece flange is achieved through the lateral movement of the third upper flange roll 12. Lateral oscillation mechanisms are installed on the mold frames 1 on both sides of the fourteenth and fifteenth roll groups, such as... Figure 18 and Figure 19 As shown, each transverse oscillation mechanism includes an oscillation seat 25, on which a third upper wing roll 12 is mounted via a rotating shaft. The third upper wing roll 12 can rotate with the workpiece.

[0049] One end of the swing seat 25 is mounted on the mold frame 1 via a hinge seat 26. The other end of the swing seat 25 is provided with a push rod 27. Corresponding to the position of the push rod 27, a guide support seat 28 is installed on the mold frame 1. A threaded nut sleeve 29 that can move along the length direction is fitted inside the guide support seat 28. A second drive motor 30 is installed at one end of the guide support seat 28. The output shaft of the second drive motor 30 is provided with a push screw 31 that cooperates with the threaded nut sleeve 29. One end of the threaded nut sleeve 29 is connected to the push screw 31, and the other end of the threaded nut sleeve 29 passes through the guide support seat 28 and is connected to the push rod 27.

[0050] After the second drive motor 30 starts, under the guidance of the guide support seat 28, the jacking screw 31 rotates and drives the nut sleeve rod 29 to extend outward. The jacking rod 27 pushes the swing seat 25 to swing around the hinge seat 26, which in turn allows the third upper wing roll 12 to move closer to or away from the third lower wing roll 11, and to perform overpressure operation on the wing surface of the U-shaped beam workpiece.

[0051] The forming mold described in this utility model has a compact overall structure and a reasonable layout of each roller group, facilitating installation and maintenance. Furthermore, the vertical movement mechanism and horizontal swing mechanism on the mold frame are rationally designed and easy to operate, enabling quick and accurate adjustment of the roller group's position and angle, thus improving production efficiency and extending the mold's service life. In summary, the forming mold of this utility model for rolling automotive longitudinal beams without indentations on the outer surface has significant technical advantages and positive effects, providing an efficient and high-quality solution for the production of automotive longitudinal beams.

[0052] The technical solution of this utility model is not limited to the scope of the embodiments described herein. All technical contents not described in detail herein are publicly known technologies.

Claims

1. A forming mold for rolling an automotive longitudinal beam without indentations on its outer surface, characterized in that: It includes a mold frame (1), in which sixteen roll groups are installed. Each roll group is equipped with a horizontally arranged upper spindle (2) and lower spindle (3). The first roll group to the tenth roll group each includes two sets of first upper surface rolls (4) arranged side by side. The first upper surface rolls (4) are installed on the upper spindle (2) and can rotate synchronously with the upper spindle (2). Each first upper surface roll (4) is equipped with a first upper wing roll (5) that can rotate relative to it. The first upper wing rolls (5) are fitted around the upper spindle (2). Two sets of first lower surface rolls (6) are arranged side by side on the lower spindle (3) at the bottom of the first upper surface rolls (4). The bending angle of the first upper wing rolls (5) in the first roll group to the tenth roll group gradually increases. Both the eleventh and twelfth roll groups include two sets of second upper surface rolls (7) arranged side by side. The second upper surface rolls (7) are mounted on the upper main shaft (2) and can rotate synchronously with the upper main shaft (2). Two sets of second lower surface rolls (8) are mounted side by side on the lower main shaft (3) at the bottom of the second upper surface rolls (7). A second upper wing roll (9) that can rotate horizontally is mounted on the mold frame (1) between the second upper surface rolls (7) and the second lower surface rolls (8). The rotation axis of the second upper wing roll (9) is arranged perpendicular to the rotation axis of the second upper surface roll (7). The bending angle of the second upper wing roll (9) is less than 90 degrees and greater than the bending angle of the first upper wing roll (5) in the tenth roll group. The thirteenth to sixteenth roll groups each include a third upper web roll (10) mounted on the upper main shaft (2). The third upper web roll (10) can rotate synchronously with the upper main shaft (2). Two sets of third lower web rolls (11) are mounted side by side on the lower main shaft (3) at the bottom of the third upper web roll (10). A third upper wing that can rotate horizontally is mounted on the mold frame (1) between the third upper web roll (10) and the third lower web roll (11). The rotation axis of the third upper wing roll (12) is arranged perpendicular to the rotation axis of the third upper belly roll (10). The bending angle of the third upper wing roll (12) in the thirteenth and sixteenth roll groups is 90 degrees. The bending angle of the third upper wing roll (12) in the fourteenth and fifteenth roll groups is greater than 90 degrees. The outer circumference of the third upper wing roll (12) is arranged in conjunction with the side of the third lower belly roll (11). In the first roll group, the width of the first upper abdominal roll (4) on both sides is the same. In the second roll group, the width of the first upper abdominal roll (4) on both sides is arranged with the left side wider and the right side narrower. In the third roll group, the width of the first upper abdominal roll (4) on both sides is arranged with the left side narrower and the right side wider. In the fourth roll group, the width of the first upper abdominal roll (4) on both sides is the same. From the fourth roll group to the twelfth roll group, the width of the upper abdominal roll on both sides is arranged in a cross pattern according to the arrangement rules of the first three roll groups.

2. The forming mold for rolling an automotive longitudinal beam without indentations on its outer surface according to claim 1, characterized in that: An upper spacer (13) is fitted on the upper main shaft (2) on one side of the first upper abdominal roll (4). A first upper wing roll (5) is installed on the outer periphery of the upper spacer (13) through a bearing (14). The first upper wing roll (5) can rotate relative to the first upper abdominal roll (4).

3. The forming mold for rolling an automotive longitudinal beam without indentations on its outer surface according to claim 1, characterized in that: A lower spacer (15) is fitted on the lower main shaft (3) on one side of the first lower abdominal roll (6). The first lower abdominal roll (6) and the lower spacer (15) in the first to fourth roll groups are two combined components, while the first lower abdominal roll (6) and the lower spacer (15) in the fifth to tenth roll groups are one integrated component.

4. The forming mold for rolling an automotive longitudinal beam without indentations on its outer surface according to claim 1, characterized in that: The bending angle of the first upper wing roll (5) in the first to tenth roll groups gradually increases from 0 to 80 degrees. The bending angle of the first upper wing roll (5) in each roll group is 7-8 degrees larger than that of the previous first upper wing roll (5).

5. The forming mold for rolling an automotive longitudinal beam without indentations on its outer surface according to claim 1, characterized in that: The bending angle of the second upper wing roll (9) in the twelfth roll group is greater than that of the second upper wing roll (9) in the eleventh roll group. The bending angle of the second upper wing roll (9) is 80-85 degrees.

6. The forming mold for rolling an automotive longitudinal beam without indentation on its outer surface according to claim 1, characterized in that: The bending angle of the third upper wing roll (12) in the fourteenth roll group is 95-96 degrees, and the bending angle of the third upper wing roll (12) in the fifteenth roll group is 92-93 degrees.

7. The forming mold for rolling an automotive longitudinal beam without indentations on its outer surface according to claim 1, characterized in that: The cross-section of the third upper abdominal roll (10) in the thirteenth roll group is an outwardly convex elliptical shape, and the outer circumference of the third lower abdominal roll (11) on both sides of the thirteenth roll group is inclined towards the middle position of the roll group.

8. The forming mold for rolling an automotive longitudinal beam without indentations on its outer surface according to claim 1, characterized in that: The third upper web roll (10) in the thirteenth roll group can be vertically raised and lowered relative to the mold frame (1). Vertical movement mechanisms are installed on both sides of the mold frame (1) of the thirteenth roll group. Each vertical movement mechanism includes a vertical movement slide (16). The mold frame (1) is provided with a vertical movement guide rail (17) that cooperates with the vertical movement slide (16). A pressing screw (18) is installed on the vertical movement slide (16). A support (19) is installed on the mold frame (1) above the vertical movement slide (16). A nut sleeve (20) that cooperates with the pressing screw (18) is provided in the support (19). The nut sleeve (20) is installed in the support (19) through the pressure cover (21). A worm wheel (22) is provided on the outer periphery of the nut sleeve (20). A worm (23) that meshes with the worm wheel (22) is installed in the support (19). A first drive motor (24) is installed on the mold frame (1) on one side of the support (19). The output shaft of the first drive motor (24) is connected to the worm (23). A third upper abdominal roll (10) is installed between the vertical sliding blocks (16) on both sides. When the first drive motor (24) is started, it can drive the third upper abdominal roll (10) to rise and fall vertically.

9. The forming mold for rolling an automotive longitudinal beam without indentations on its outer surface according to claim 1, characterized in that: The third upper flange roll (12) in the fourteenth and fifteenth roll groups can move closer to or further away from the third lower flange roll (11). A transverse oscillation mechanism is installed on both sides of the mold frame (1) of the fourteenth and fifteenth roll groups. Each transverse oscillation mechanism includes an oscillation seat (25). The third upper flange roll (12) is mounted on the oscillation seat (25) via a rotating shaft. One end of the oscillation seat (25) is mounted on the mold frame (1) via a hinge seat (26). The other end of the oscillation seat (25) is provided with a push rod (27). Corresponding to the position of the push rod (27), on the mold frame (1)... A guide support seat (28) is installed on the upper part. A threaded nut sleeve (29) that can move along the length direction is installed inside the guide support seat (28). A second drive motor (30) is installed at one end of the guide support seat (28). A jacking screw (31) that cooperates with the threaded nut sleeve (29) is provided on the output shaft of the second drive motor (30). One end of the threaded nut sleeve (29) is connected to the jacking screw (31). The other end of the threaded nut sleeve (29) passes through the guide support seat (28) and is connected to the jacking rod (27). When the second drive motor (30) is started, it can drive the swing seat (25) to rotate around the hinge seat (26).

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