Roll bending combined die for special-shaped frames with various sections of carrier rocket and using method of roll bending combined die

Abstract

The invention provides a roll bending combined die for a carrier rocket special-shaped frame with multiple sections and a using method, the roll bending combined die comprises a middle front roller, a middle rear roller, a side roller, a side pressing wheel and a plurality of roller cushion blocks, the middle front roller is installed on the front side of the middle of the special-shaped frame, and the middle rear roller is installed below the rear side of the middle of the special-shaped frame. Side rollers and side pressing wheels are installed on the two sides of the special-shaped frame respectively, and roller cushion blocks are installed below the middle front roller and the middle rear roller. The method has the beneficial effects that a split combined die structure is adopted for roll bending forming of the profile frame, the number of dies is reduced, the production cost is reduced, and workers can conveniently transport and install the profile frame; the split combined die structure can select whether a cover plate needs to be installed or not according to profile characteristics, friction of a thin area at the top end of a part is reduced, and part forming quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of special-shaped frame rolling and bending, and in particular relates to a combined die for rolling and bending special-shaped frames with various cross-sections for launch vehicles and a use method thereof. Background Art

[0002] There are many types of launch vehicle profile frame sections. Commonly used profiles include right-angle, obtuse-angle and acute-angle profiles. Some profiles have similar cross-sections. For example, for right-angle profiles, only the bottom thickness and length are different, and the other dimensions are the same. Figure 1 shown.

[0003] The profile frame is formed by rolling. The original integral mold is used. One set of integral molds corresponds to one cross-section of the profile. The number of molds is large, the cost is high, and the integral mold is heavy, which is inconvenient to transport and install. The integral mold is consistent with the cross-section of the profile, and the top, bottom and sides of the profile are fixed. For some profiles, there will be up and down movement during the rolling process. The integral mold surface is fixed tightly, which will produce abrasives on the thin area on the top surface of the profile, affecting the surface quality of the parts.

[0004] In order to solve the above problems, the present invention designs a split combined rolling and bending die. Summary of the invention

[0005] In view of this, the present invention aims to propose a combined rolling die and a method for using the rolling bending of various cross-section special-shaped frames of launch vehicles, so as to solve the problem that the profile frame rolling bending adopts an integral die, the number of dies is large, the cost is high, the transportation and installation are inconvenient, and the top surface will be abrasive, which affects the surface quality of the parts. According to the cross-sectional characteristics of the launch vehicle profile, a split combined rolling die is designed to reduce the die cost and improve the surface quality of the parts.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] In the first aspect, the present invention provides a combination die for rolling and bending special-shaped frames of various cross-sections for launch vehicles, including a center front roller, a center rear roller, side rollers, side pressure wheels and a plurality of roller pads, wherein the center front roller is installed to the front side of the middle part of the special-shaped frame, the center rear roller is installed to the lower part of the middle part of the special-shaped frame, and roller pads are installed, side rollers and side pressure wheels are installed on both sides of the special-shaped frame, and roller pads are installed below the center front roller and the center rear roller.

[0008] Furthermore, the center front roller and the side rollers are both split structures, and the center front roller includes a center front roller core, a lower baffle, an upper cover plate and a thickness gasket. The upper cover plate is installed above the center front roller core, and the lower baffle is installed below the center front roller core. A thickness gasket is also installed between the center front roller core and the lower baffle. The center front roller and the side rollers have the same structure.

[0009] Furthermore, the roller pad is used to adjust the roller height of the middle front roller and the middle rear roller so that the bottom plane of the middle front roller part is flush with the bottom plane of the middle rear roller part, and multiple roller pads are provided.

[0010] Furthermore, the side pressure wheel includes a top block threaded integral shaft, a pressure cover, a pressure wheel, a spacer sleeve washer, a bearing, a pressure wheel fixing block and a double nut. The pressure cover is installed above the pressure wheel, and the top block threaded integral shaft is connected to the inside of the pressure wheel through a bearing. The bottom of the top block threaded integral shaft is connected to the pressure wheel fixing block through a double nut, and a spacer sleeve washer is also mounted on the top block threaded integral shaft.

[0011] Furthermore, the bearing and the pressure wheel adopt an interference fit, and the bearing is a double-row angular contact ball bearing.

[0012] Furthermore, the diameter of the middle threaded shaft of the top block threaded integrated shaft is Ф40mm.

[0013] Furthermore, the diameter of the pressing wheel is Ф162mm.

[0014] Furthermore, the spacer washer includes a height spacer and a thickness washer. The height spacer is installed between the threaded integral shaft of the top block and the pressure cover, and the thickness washer is installed below the connection between the threaded integral shaft of the top block and the pressure wheel.

[0015] In the second aspect, based on the same concept, the present invention also provides a method for using a combination die for rolling and bending a plurality of cross-section special-shaped frames of a launch vehicle, comprising the following steps:

[0016] S1. Install the rolling and bending combination die;

[0017] S2, using a rolling and bending combination die to roll and bend the special-shaped frame;

[0018] S3. Check the radius, bottom flatness and vertical angle parameters of the special-shaped frame parts;

[0019] In step S2, the special-shaped frame is roll-bent by using a roll-bending combined die, including:

[0020] Insert one end of the special-shaped frame into the pressing wheel and the side roller first, then move the profile and insert it into the gap between the middle front and middle rear rollers to compact the profile in the middle front and middle rear rollers; start the equipment, and the middle front and middle rear rollers rotate to drive the profile to move, and through multiple rolling bends, the straight material profile is bent into a part with the target radius.

[0021] Furthermore, in step S1, the rolling and bending assembly die is installed, including:

[0022] S11. Install the roller pad:

[0023] According to the height of the middle front roller and the middle rear roller, calculate the total height of the roller pads to be installed under the middle front and middle rear rollers, and then select 3-5 combined pads to ensure that the bottom planes of the middle front and middle rear roller parts are at the same height;

[0024] S12, install the roller:

[0025] Install each roller and baffle into the roller shaft of the equipment. First install the middle front roller assembly, and then install the middle front roller lower baffle, middle front roller thickness gasket, middle front roller mold core, and middle front roller upper cover plate in sequence; then install the middle rear roller; then install the side rollers, and then install the side roller lower baffle, side roller mold core, and side roller upper cover plate in sequence; adjust the height of the rollers on both sides to ensure that the bottom planes of the middle front roller, middle rear roller, and side roller parts are at the same height;

[0026] S13. Install the pressure wheels on both sides:

[0027] Install the pressure wheel assembly on one side first, and then install the pressure wheel assembly on the other side. Take the installation of the pressure wheel assembly on one side as an example. First, install the pressure cover, height spacer sleeve, and top block threaded integrated shaft into the pressure wheel in sequence, and tighten the pressure cover nut; secondly, screw the double nuts onto the top block threaded integrated shaft; thirdly, screw the pressure wheel fixing block onto the top block threaded integrated shaft; then insert the installed pressure wheel assembly, top block threaded integrated shaft, and pressure wheel fixing block into the upper and lower connecting rods of the equipment side shaft, and then screw the side nut on the connecting rod to fix the threaded integrated shaft and the pressure wheel fixing block in horizontal position;

[0028] After installing the pressing wheel assembly, adjust the upper and lower height and horizontal position of the pressing wheel according to the thickness of the profile parts to ensure that the pressing wheel can press the bottom plane of the profile.

[0029] Compared with the prior art, the combined die and method for rolling and bending special-shaped frames of launch vehicles with various cross-sections described in the present invention have the following advantages:

[0030] (1) The present invention discloses a combined die and a method for rolling and bending special-shaped frames of launch vehicles with various cross-sections. The profile frame rolling and forming adopts a split combined die structure, which saves the number of dies, reduces production costs, and facilitates workers to transport and install.

[0031] (2) The present invention describes a combined die and method for rolling and bending special-shaped frames of launch vehicles with various cross-sections. The split combined die structure can select whether to install a cover plate according to the characteristics of the profile, thereby reducing friction in the thin area at the top of the part and improving the forming quality of the part.

[0032] (3) The combined die and method for rolling and bending special-shaped frames of launch vehicles with various cross-sections described in the present invention have pressure wheels on both sides. For profiles that require a roller height difference and have a thicker bottom edge, the rolling and bending process can effectively press the profile and improve the forming accuracy of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 It is a schematic diagram of a cross section of some right-angle profiles in the prior art;

[0035] Figure 2 This is a schematic diagram of an integral rolling bending die according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of a split combined rolling and bending die according to an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of a pressure wheel according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of a gland according to an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of a height spacer according to an embodiment of the present invention;

[0040] Figure 7 The figure is a flowchart of the method of use described in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0045] like Figures 2 to 7 As shown in the figure, a combined rolling die for rolling and bending various cross-section special-shaped frames of launch vehicles is used. The rolling and bending die is changed from an integral structure to a split combined structure. The rolling and bending die is divided into a middle front roller, a middle rear roller, two side rollers, two side pressure rollers and a roller pad. Taking a right-angle profile frame rolling and bending die as an example, the front and rear integral and split combined dies are changed as shown in the figure. Figures 2 to 3 shown.

[0046] The specific technical solution of the split combined rolling and bending die is as follows:

[0047] 1. The center front roller and the rollers on both sides are designed as split structures, including roller core, lower baffle, upper cover and thickness gasket. For profiles with different cross-sections, only the core and thickness gasket need to be replaced. For profiles with similar cross-sections, only the thickness gasket needs to be replaced.

[0048] 2. Roller pads are placed under the center front roller and the center rear roller to adjust the roller height so that the bottom plane of the center front roller part is flush with the bottom plane of the center rear roller part. The original integral mold roller pad is a mold that uses an integral fixed height pad. After the change, the split mold uses several pads of standard sizes. Different pads are used for molds with profiles of different heights.

[0049] 3. The rollers on both sides are designed as a split structure. For parts that move up and down during the rolling and bending process of some profiles, the upper covers of the rollers on both sides can be removed to reduce the friction of the thin area at the top of the parts and improve the forming quality of the parts.

[0050] 4. Design of pressure wheels on both sides:

[0051] The rolling and bending process of some profiles requires setting the upper and lower heights of the rollers on both sides so that there is a height difference between the middle roller and the rollers on both sides to prevent the profile from twisting. In this process, the upper covers of the rollers on both sides are removed, and the parts will not produce abrasive phenomena. However, for parts with thicker bottom edges of profiles (≥6mm), if the upper covers of the rollers on both sides are removed during the rolling and bending process, due to the larger rolling pressure and the smaller pressure wheels on both sides, there will be a gap between the pressure wheels and the bottom edge of the profile, resulting in the pressure wheels being unable to press the parts tightly, and the parts will be twisted after rolling and bending.

[0052] The reasons why the pressure rollers on profiles with thicker bottom edges cannot press parts are as follows: the original pressure rollers on both sides were designed to be tightened with nuts up and down, and the nuts would loosen during the rolling process; the pressure roller fixing blocks on the original threaded shafts in the middle of the pressure rollers on both sides were through holes, and during the rolling process the middle threaded shafts would rotate with the parts and rotate upward, causing the middle threaded shafts of the pressure rollers to collide with the connecting rod in the pressure roller fixing blocks, resulting in a gap between the pressure roller and the bottom edge of the profile; the pressure roller bearings were clearance fit, and the clearance was about 0.5mm, so the pressure rollers would shake left and right during the rolling process, causing a gap.

[0053] Therefore, the pressure wheels on both sides are innovatively designed. Figures 4 to 6 The specific plan is as follows:

[0054] (1) The top block threaded integral shaft can make the upper pressure wheel fixing block and the middle threaded shaft of the pressure wheel into an integral structure, which can effectively prevent the middle threaded shaft from rotating upward.

[0055] (2) The lower pressure wheel fixing block and the top block threaded integral shaft adopt a double nut structure, which can effectively lock the pressure wheel.

[0056] (3) Adding a pressure cover: A pressure cover is added to the pressure wheel. The pressure cover and the pressure wheel are connected with bolts, making the structure more stable.

[0057] (4) Increase the diameter of the middle threaded shaft of the top block threaded integrated shaft: The diameter of the middle threaded shaft is increased from Ф30mm to Ф40mm, and the structure is more stable.

[0058] (5) Increase the diameter of the pressure wheel: The diameter of the pressure wheels on both sides is increased from Ф156mm to Ф162mm, which provides greater pressure.

[0059] (6) The side pressure wheel and the bearing adopt interference fit: the side pressure wheel and the bearing are quenched, and the bearing is installed into the middle hole of the pressure wheel to form an interference fit. In this way, the side pressure wheel is subjected to force on one side during the rolling process, and there will be no shaking on both sides to produce gaps. The original pressure wheel uses ball bearings, and the pressure wheel uses double-row angular contact ball bearings after the change.

[0060] (7) A spacer washer is designed on the upper side of the pressure wheel. The spacer washer includes a height spacer and a thickness washer. The spacer washer has different heights to facilitate the adjustment of the pressure wheel installation height.

[0061] A method for using a combined rolling die for rolling and bending special-shaped frames of launch vehicles with various cross-sections, comprising:

[0062] How to use the split combination mold:

[0063] (1) Install the mold

[0064] ①Install the roller combination pad

[0065] According to the height of the center-front and center-rear rollers, calculate the total height of the pads that need to be installed under the center-front and center-rear rollers, and then select 3-5 combination pads of appropriate height to ensure that the bottom planes of the center-front and center-rear roller parts are at the same height.

[0066] ②Install the roller

[0067] Install each roller and baffle into the roller shaft of the equipment. First install the middle front roller assembly, then install the middle front roller lower baffle, middle front roller thickness gasket, middle front roller mold core, and middle front roller upper cover in sequence; then install the middle rear roller; then install the roller assemblies on both sides, then install the roller lower baffles on both sides, roller mold cores on both sides, and roller upper covers on both sides in sequence (choose whether to install the side roller upper cover according to the thickness of the profile. For parts with a profile bottom thickness of ≥6mm, do not install the side roller upper cover). Adjust the height of the rollers on both sides to ensure that the bottom planes of the middle front, middle rear, and side roller parts are at the same height.

[0068] ③Install the pressure wheels on both sides

[0069] Install the pressure roller assembly on one side first, and then install the pressure roller assembly on the other side. Take the installation of the pressure roller assembly on one side as an example. First, install the pressure cover, height spacer, and top block threaded integrated shaft into the pressure roller in sequence, and tighten the pressure cover nut; secondly, screw the double nut into the top block threaded integrated shaft; thirdly, screw the pressure roller fixing block onto the top block threaded integrated shaft. Then insert the installed pressure roller assembly, top block threaded integrated shaft, and pressure roller fixing block into the upper and lower connecting rods of the equipment side shaft, and then screw the side nut on the connecting rod to fix the threaded integrated shaft and pressure roller fixing block in horizontal position.

[0070] After installing the pressing wheel assembly, adjust the upper and lower height and horizontal position of the pressing wheel according to the thickness of the profile parts to ensure that the pressing wheel can press the bottom plane of the profile.

[0071] (2) Roll forming

[0072] Insert one end of the profile into the pressing wheel and the side roller first, then move the profile and insert it into the gap between the middle front and middle rear rollers to compact the profile between the middle front and middle rear rollers. Start the equipment, the middle front and middle rear rollers rotate to drive the profile to move, and through multiple rolling bends, the straight profile is bent into a part with the target radius.

[0073] (3) Inspection

[0074] Remove the profile parts and check the radius, bottom edge flatness and vertical edge angle parameters of the profile parts.

[0075] Through the split combination mold design, the profile rolling process can choose whether to install a cover plate according to the characteristics of the profile to reduce friction in the thin area at the top of the part. The pressure wheels on both sides can press the profile, and the profile rolling forming accuracy is higher.

[0076] Advantages of the present invention:

[0077] (1) The profile frame roll-bending adopts a split combined mold structure, which saves the number of molds, reduces production costs, and facilitates workers to transport and install.

[0078] (2) The split combined mold structure can choose whether to install a cover plate according to the characteristics of the profile, reduce friction in the thin area at the top of the part, and improve the forming quality of the part.

[0079] (3) The design of the pressure wheels on both sides can effectively press the profiles and improve the forming accuracy of parts for profiles with thicker bottom edges that require a roller height difference.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined rolling die for rolling and bending special-shaped frames of various cross-sections for launch vehicles, characterized in that: It includes a middle front roller, a middle rear roller, side rollers, side pressure wheels and a plurality of roller pads. The middle front roller is installed to the front side of the middle part of the special-shaped frame, the middle rear roller is installed to the lower part of the middle rear side of the special-shaped frame, and roller pads are installed on both sides of the special-shaped frame. Side rollers and side pressure wheels are respectively installed on both sides of the special-shaped frame, and roller pads are installed below the middle front roller and the middle rear roller.

2. The combined rolling die for rolling and bending various cross-section special-shaped frames for launch vehicles according to claim 1, characterized in that: The center front roller and the side rollers are both split structures, and the center front roller includes a center front roller core, a lower baffle, an upper cover plate and a thickness gasket. The upper cover plate is installed above the center front roller core, and the lower baffle is installed below the center front roller core. A thickness gasket is also installed between the center front roller core and the lower baffle. The center front roller and the side rollers have the same structure.

3. The combined rolling die for rolling and bending various cross-section special-shaped frames for launch vehicles according to claim 1, characterized in that: The roller pad is used to adjust the roller height of the middle front roller and the middle rear roller so that the bottom plane of the middle front roller part is flush with the bottom plane of the middle rear roller part. There are multiple roller pads.

4. The combined rolling die for rolling and bending various cross-section special-shaped frames for launch vehicles according to claim 1, characterized in that: The side pressure wheel includes a top block threaded integral shaft, a pressure cover, a pressure wheel, a spacer sleeve washer, a bearing, a pressure wheel fixing block and a double nut. The pressure cover is installed above the pressure wheel, and the top block threaded integral shaft is sleeved inside the pressure wheel through a bearing. The bottom of the top block threaded integral shaft is connected to the pressure wheel fixing block through a double nut, and a spacer sleeve washer is also sleeved on the top block threaded integral shaft.

5. The combined rolling die for rolling and bending various cross-section special-shaped frames for launch vehicles according to claim 4, characterized in that: The bearing and the pressure wheel adopt interference fit, and the bearing is a double-row angular contact ball bearing.

6. The combined rolling die for rolling and bending various cross-section special-shaped frames for launch vehicles according to claim 4, characterized in that: The diameter of the middle threaded shaft of the top block threaded integrated shaft is Φ40mm.

7. The combined rolling die for rolling and bending various cross-section special-shaped frames for launch vehicles according to claim 4, characterized in that: The diameter of the pressing wheel is Ф162mm.

8. The combined rolling die for rolling and bending various cross-section special-shaped frames for launch vehicles according to claim 4, characterized in that: The spacer washer comprises a height spacer and a thickness washer. The height spacer is installed between the top block threaded integral shaft and the pressure cover, and the thickness washer is installed below the connection between the top block threaded integral shaft and the pressure wheel.

9. A method for using a combined rolling die for rolling and bending special-shaped frames of launch vehicles with various cross-sections, applied to the combined rolling die for rolling and bending special-shaped frames of launch vehicles with various cross-sections as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Install the rolling and bending combination die; S2, using a rolling and bending combination die to roll and bend the special-shaped frame; S3. Check the radius, bottom flatness and vertical angle parameters of the special-shaped frame parts; In step S2, the special-shaped frame is roll-bent by using a roll-bending combined die, including: Insert one end of the special-shaped frame into the pressing wheel and the side roller first, then move the profile and insert it into the gap between the middle front and middle rear rollers to compact the profile in the middle front and middle rear rollers; start the equipment, and the middle front and middle rear rollers rotate to drive the profile to move, and through multiple rolling bends, the straight material profile is bent into a part with the target radius.

10. The method for using the combined rolling die for rolling and bending various cross-section special-shaped frames of launch vehicles according to claim 9, characterized in that: In step S1, installing a rolling and bending assembly die includes: S11. Install the roller pad: According to the height of the middle front roller and the middle rear roller, calculate the total height of the roller pads to be installed under the middle front and middle rear rollers, and then select 3-5 combined pads to ensure that the bottom planes of the middle front and middle rear roller parts are at the same height; S12, install the roller: Install each roller and baffle into the roller shaft of the equipment. First install the middle front roller assembly, and then install the middle front roller lower baffle, middle front roller thickness gasket, middle front roller mold core, and middle front roller upper cover plate in sequence; then install the middle rear roller; then install the side rollers, and then install the side roller lower baffle, side roller mold core, and side roller upper cover plate in sequence; adjust the height of the rollers on both sides to ensure that the bottom planes of the middle front roller, middle rear roller, and side roller parts are at the same height; S13, install the pressure wheels on both sides: First install the pressure roller assembly on one side, and then install the pressure roller assembly on the other side. Taking the installation of the pressure roller assembly on one side as an example, first, install the pressure cover, height spacer sleeve, and top block threaded integrated shaft into the pressure roller in sequence, and tighten the pressure cover nut; secondly, screw the double nuts onto the top block threaded integrated shaft; thirdly, screw the pressure roller fixing block onto the top block threaded integrated shaft; then insert the installed pressure roller assembly, top block threaded integrated shaft, and pressure roller fixing block into the upper and lower connecting rods of the equipment side shaft, and then screw the side nut on the connecting rod to fix the threaded integrated shaft and the pressure roller fixing block in horizontal position; After installing the pressing wheel assembly, adjust the upper and lower height and horizontal position of the pressing wheel according to the thickness of the profile parts to ensure that the pressing wheel can press the bottom plane of the profile.

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