Method and system for spinning and folding a cross-ply barrel with an inclined cross-ply
By adding a process supplement area and conducting finite element simulation evaluation during the spinning process of the inclined cross-ribbed cylinder, the folding defect problem in spinning forming was solved, improving part quality and production efficiency, and simplifying the operation process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-03-24
AI Technical Summary
Existing technologies for spinning thin-walled cylindrical bodies with oblique cross ribs suffer from problems such as long processing cycles, high welding difficulty, low material utilization, and easy folding defects during spinning, which affect the load-bearing capacity and service life of the parts.
A process supplement area is added at the intersection of the ribs. The spinning process scheme is evaluated and adjusted through finite element simulation model to control material flow, avoid folding defects, and remove areas that exceed the design specifications through machining.
It effectively avoids rib folding, improves part quality and spinning production efficiency, simplifies the operation process, and increases material utilization.
Smart Images
Figure CN120133362B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of spinning technology, specifically to a method and system for controlling the spinning and folding of obliquely placed cross-ribbed cylinders. Background Technology
[0002] Thin-walled cylinders with intersecting ribs are components of rocket fuel tanks. Currently, the common engineering approach is machining via milling, bending, and welding. However, this process suffers from drawbacks such as long processing cycles, difficult welding, and low material utilization. Flow spinning, a localized plastic forming technique, shows potential for the integrated forming of thin-walled cylinders with intersecting internal ribs. However, due to the complex structure and uneven material flow, folding defects are prone to occur at the intersections of the internal ribs. Figure 1 As shown. This defect disrupts the continuity of the metal, reducing the load-bearing capacity of the part. It also acts as a gap in the component, causing stress concentration during use, becoming a fatigue source, and potentially leading to fatigue fracture of the part.
[0003] To achieve a full, ribbed structure, sufficient compression or thinning rate is required. A greater thinning rate leads to more intense material flow, exacerbating folding. Adjustments to other common process parameters, such as feed rate, spinneret angle of attack, and spinneret radius, do not affect this defect. Therefore, there is an urgent need to develop a control method to improve the quality of spin forming of thin-walled cylindrical bodies with obliquely placed cross-ribs. Summary of the Invention
[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method and system for controlling the spinning and folding of obliquely placed cross-ribbed cylindrical bodies.
[0005] A method for controlling the spinning and folding of a cylindrical body with obliquely placed cross-ribs according to the present invention includes:
[0006] Step S1: Add a process supplement area below the rib;
[0007] Step S2: Use the established finite element simulation model to evaluate the cross-ribbed cylinder after adding the process supplement area;
[0008] Step S3: Based on the evaluation results, complete the part using the predetermined spinning process.
[0009] Preferred options also include:
[0010] Step S4: If folds occur in the process supplement area of the part or the weight of the part exceeds the design specification value, then it shall be removed by machining.
[0011] Preferably, step S1 includes:
[0012] Based on the design of the obliquely placed cross ribs and the relative motion of the predetermined rotating wheel, a process supplement area is added below the ribs; the process supplement area includes a triangular area with a horizontal bottom boundary.
[0013] Preferably, the process replenishment area is added only at one corner at the intersection, axially in the opposite direction of the wheel motion, and circumferentially on the side of the initial filling.
[0014] Preferably, the length of the process supplement area is at least 0.5 times the maximum value of the circumferential width and axial width of the rib intersection area.
[0015] Preferably, the length of the triangular region is set according to the circumferential width and axial width of the intersection region:
[0016] If the circumferential width Wc of the intersection region is equal to the axial width Wa, then the length L of the triangular region is 1*Wc;
[0017] If the circumferential width Wc of the intersection region is greater than the axial width Wa, then the length L of the triangular region is 1*Wc;
[0018] If the circumferential width Wc of the intersection region is less than the axial width Wa, then the length L of the triangular region is 1*Wa.
[0019] Preferably, the weight of the cross-ribbed cylinder after the addition of the process supplement area does not exceed 3% of the original weight of the cross-ribbed cylinder.
[0020] Preferably, the finite element model is locally divided at the location of the ribs, so that the fillet of the ribs contains more than 6 meshes; the stress of the cross-rib tube after adding the process supplement area is less than the stress of the original cross-rib tube under the same load-bearing conditions.
[0021] A spin-folding control system for obliquely placed cross-ribbed cylindrical bodies according to the present invention includes:
[0022] Module M1: Add a process supplement area below the rib;
[0023] Module M2: Use the established finite element simulation model to evaluate the cross-ribbed cylinder after adding the process supplement area;
[0024] Module M3: Based on the evaluation results, complete the part using the predetermined spinning process.
[0025] Preferred options also include:
[0026] Module M4: If folds occur in the process supplement area of the part or the weight of the part exceeds the design specification value, then it will be removed by machining.
[0027] Preferably, the module M1 includes:
[0028] Based on the design of the obliquely placed cross ribs and the relative motion of the predetermined rotating wheel, a process supplement area is added below the ribs; the process supplement area includes a triangular area with a horizontal bottom boundary.
[0029] Preferably, the process replenishment area is added only at one corner at the intersection, axially in the opposite direction of the wheel motion, and circumferentially on the side of the initial filling.
[0030] Preferably, the length of the process supplement area is at least 0.5 times the maximum value of the circumferential width and axial width of the rib intersection area.
[0031] Preferably, the length of the triangular region is set according to the circumferential width and axial width of the intersection region:
[0032] If the circumferential width Wc of the intersection region is equal to the axial width Wa, then the length L of the triangular region is 1*Wc;
[0033] If the circumferential width Wc of the intersection region is greater than the axial width Wa, then the length L of the triangular region is 1*Wc;
[0034] If the circumferential width Wc of the intersection region is less than the axial width Wa, then the length L of the triangular region is 1*Wa.
[0035] Preferably, the weight of the cross-ribbed cylinder after the addition of the process supplement area does not exceed 3% of the original weight of the cross-ribbed cylinder.
[0036] Preferably, the finite element model is locally divided at the location of the ribs, so that the fillet of the ribs contains more than 6 meshes; the stress of the cross-rib tube after adding the process supplement area is less than the stress of the original cross-rib tube under the same load-bearing conditions.
[0037] Compared with the prior art, the present invention has the following beneficial effects:
[0038] 1. The oblique cross-ribbed cylindrical body spinning and folding control method provided by the present invention can effectively avoid the occurrence of rib folding and its impact, greatly improve the quality of produced parts, and is simple to operate and easy to implement, and has good practicality.
[0039] 2. The present invention imposes restrictions on the addition of new processes, has minimal impact on the original processing efficiency, and improves the overall spinning production efficiency of the inclined cross-ribbed cylinder.
[0040] Other beneficial effects of the present invention will be explained in detail through the introduction of specific technical features and technical solutions in specific embodiments. Those skilled in the art should be able to understand the beneficial technical effects brought about by these technical features and technical solutions through the introduction of these technical features and technical solutions. Attached Figure Description
[0041] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0042] Figure 1 This is a diagram showing the defects in the spin-folding of the obliquely placed cross-ribbed cylinder in this invention.
[0043] Figure 2 This is a schematic diagram of the intersection of the obliquely placed ribs in this invention.
[0044] Figure 3 A schematic diagram is added to supplement the process at the intersection of the obliquely placed ribs in this invention.
[0045] Figure 4 This is a stress distribution diagram of a reinforcing unit added as a process supplement in this invention.
[0046] Figure 5 The diagram shows the experimental results of the parts for which additional processes were added in this invention.
[0047] Figure 6 This is a flowchart of the method of the present invention. Detailed Implementation
[0048] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.
[0049] During the spinning process of the obliquely intersecting ribbed cylinder, the material experiences intense circumferential and axial flow. The folding at the rib intersection is caused by excessive axial flow leading to a poor fit between the material and the upstream of the rib groove, while excessive circumferential flow causes subsequent replenishment material in this poor fit area to be subjected to circumferential compression within the rib groove instead of radial flow into the wall panel, resulting in folding.
[0050] By adding process supplements and increasing the size of the rib grooves in easily foldable areas, the material filling requirements at these locations can be increased. This can control excessive axial and circumferential flow of material within the rib grooves, thus preventing folds to some extent. If folds still occur in the process supplement area or the part weight exceeds the design specifications, the process supplements can be removed with minimal machining without affecting the original structure.
[0051] A method for controlling the spinning and folding of a cylindrical body with obliquely placed cross-ribs includes:
[0052] Step S1: Make supplementary process designs at the intersection of the ribs;
[0053] The process supplement is added only at one corner of the intersection, axially in the opposite direction of the wheel's motion, and circumferentially on the side that was filled first. The length of the process supplement is at least 0.5 times the maximum of the circumferential and axial widths of the rib intersection area. The weight of the cylinder after the process supplement should not exceed 3% of the original cylinder weight.
[0054] Step S2: Establish a finite element simulation model to evaluate the deformation strength of the cross-ribbed cylinder after the addition of process modifications;
[0055] Specifically, select an element that contains intersecting ribs and import it into the finite element model.
[0056] A material model for the spun cylinder is established, which includes density, yield strength, elastic model quantities, and Poisson's ratio.
[0057] Establish a static analysis step with a process time of 1 second.
[0058] An axial constraint is applied to the bottom of the unit, circumferential constraints are applied to both sides, and a pressure load is applied to the top.
[0059] The finite element model needs to be locally divided at the rib locations. The top of the rib should have at least 10 meshes, the fillet of the rib should have at least 6 meshes, and the mesh size of the wall panel area should be at least 1 mm.
[0060] Submit the model for calculation and obtain the deformation results.
[0061] The stress of the cylinder after the process is added must be less than the stress of the original cylinder under the same load-bearing conditions.
[0062] Step S3: Develop a spinning process plan.
[0063] The single-roller design causes the spindle to be unbalanced, and most spinning machines have a maximum of 4 rollers, so the number of rollers should be selected as 2 to 4.
[0064] Step S4: Based on the part processing results or part weight design specifications, determine whether the process supplement area needs to be removed by machining.
[0065] When folds occur in the process supplement area, the process supplement is removed by machining.
[0066] If no folds appear in the process supplement area, but the weight of the cylinder exceeds the design specifications, the process supplement area shall be removed by machining according to the dimensions in the drawings.
[0067] The oblique cross-ribbed cylindrical body spinning and folding control method provided by the present invention can effectively avoid the occurrence of rib folding and its impact, greatly improve the quality of produced parts, and is simple to operate and easy to implement, and has good practicality.
[0068] The above are basic embodiments of the present invention. The technical solution of the present invention will be further described below through a preferred embodiment.
[0069] Example 1
[0070] Reference Figure 6 As shown, a method for controlling the spinning and folding of a diagonally cross-ribbed cylindrical body is as follows:
[0071] Step S1: Based on the relative motion between the inclined cross rib design and the predetermined rotating wheel, such as... Figure 2 As shown, a process supplement is added below the rib. This process supplement is a triangular area with a horizontal bottom boundary, as shown. Figure 3 As shown.
[0072] If the circumferential width Wc of the intersection region is equal to the axial width Wa, then the length L of the triangular region is 1*Wc;
[0073] If the circumferential width Wc of the intersection region is greater than the axial width Wa, then the length L of the triangular region is 1*Wc;
[0074] If the circumferential width Wc of the intersection region is less than the axial width Wa, then the length L of the triangular region is 1*Wa.
[0075] In this example, the dimensions of the obliquely arranged cross-ribbed cylinder are: outer diameter 400mm, wall thickness 6mm, and cylinder length 400mm. The rib dimensions are: rib height 4mm, rib width 4mm, and draft angle 10°. The weight increases by 0.8% after adding process adjustments.
[0076] Step S2: Establish a finite element simulation model of the stiffening element, apply the working condition load, and compare the stress level changes, such as... Figure 4 As shown, compared to the original cylinder, the added process reduces the stress in the cylinder.
[0077] Step S3: Employ a 3-wheel spinning process, with the wheel motion trajectory aligned with... Figure 2 The trajectory shown is consistent. The blank dimensions are an inner diameter of 394 mm, a wall thickness of 12 mm, and a pressing amount of 5 mm. The rotary feed speed is 1 mm / r, and the mandrel speed is 50 r / min.
[0078] Step S4: The finished part is as follows Figure 5 As shown, no folding issues occurred with the process addition. In this embodiment, the increase in weight due to the process addition is small, and the process addition can improve the stress concentration problem, so the process addition is retained.
[0079] The results of the embodiments show that the design of adding process supplements at the intersection of the ribs proposed in this invention can effectively control the spinning and folding of the obliquely intersecting rib cylinder, which is of great significance to the spinning technology in the manufacturing and process design of the obliquely intersecting rib cylinder.
[0080] This invention imposes restrictions on the addition of new processes, has minimal impact on the original processing efficiency, and improves the overall spinning production efficiency of the inclined cross-ribbed cylinder.
[0081] The present invention also provides a control system for spinning and folding obliquely interlocking ribbed cylindrical bodies. The control system can be implemented by executing the process steps of the control method for spinning and folding obliquely interlocking ribbed cylindrical bodies. That is, those skilled in the art can understand the control method for spinning and folding obliquely interlocking ribbed cylindrical bodies as a preferred embodiment of the control system.
[0082] Specifically, a control system for spinning and folding obliquely arranged cross-ribbed cylindrical bodies includes:
[0083] Module M1: Add a process supplement area below the rib;
[0084] Module M2: Use the established finite element simulation model to evaluate the cross-ribbed cylinder after adding the process supplement area;
[0085] Module M3: Based on the evaluation results, complete the part using the predetermined spinning process.
[0086] Also includes:
[0087] Module M4: If folds occur in the process supplement area of the part or the weight of the part exceeds the design specification value, then it will be removed by machining.
[0088] The module M1 includes:
[0089] Based on the design of the obliquely placed cross ribs and the relative motion of the predetermined rotating wheel, a process supplement area is added below the ribs; the process supplement area includes a triangular area with a horizontal bottom boundary.
[0090] The process supplement area is added only at one corner at the intersection, axially in the opposite direction of the rotary motion, and circumferentially on the side of the initial filling.
[0091] The length of the process supplement area is at least 0.5 times the maximum value of the circumferential width and axial width of the rib intersection area.
[0092] The length of the triangular region is set based on the circumferential width and axial width of the intersection region:
[0093] If the circumferential width Wc of the intersection region is equal to the axial width Wa, then the length L of the triangular region is 1*Wc;
[0094] If the circumferential width Wc of the intersection region is greater than the axial width Wa, then the length L of the triangular region is 1*Wc;
[0095] If the circumferential width Wc of the intersection region is less than the axial width Wa, then the length L of the triangular region is 1*Wa.
[0096] The weight of the cross-ribbed cylinder after the addition of the process supplement area shall not exceed 3% of the original weight of the cross-ribbed cylinder.
[0097] The finite element model is locally divided at the location of the stiffeners, so that the fillet of the stiffeners contains more than 6 meshes; the stress of the cross-stiffened tube after adding the process supplement area is less than the stress of the original cross-stiffened tube under the same load-bearing conditions.
[0098] Those skilled in the art will understand that, besides implementing the system and its various devices, modules, and units provided by this invention in the form of purely computer-readable program code, the same functions can be achieved entirely through logical programming of the method steps, making the system and its various devices, modules, and units of this invention function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, the system and its various devices, modules, and units provided by this invention can be considered as a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered as structures within the hardware component; alternatively, the devices, modules, and units for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.
[0099] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.
Claims
1. A method for controlling the spinning and folding of a cylindrical body with obliquely placed cross-ribs, characterized in that, include: Step S1: Add a process supplement area below the rib; Step S2: Use the established finite element simulation model to evaluate the cross-ribbed cylinder after adding the process supplement area; Step S3: Based on the evaluation results, complete the part using the predetermined spinning process. Step S1 includes: Based on the design of the inclined cross ribs and the relative motion of the predetermined rotating wheel, a process supplement area is added below the ribs; The process supplement area includes a triangular region with a horizontal bottom boundary. The process supplement area is added only at one corner at the intersection, which is located in the opposite direction of the wheel movement in the axial direction and on the side of the first filling in the circumferential direction; The length of the triangular region is set based on the circumferential width and axial width of the intersection region: If the circumferential width Wc of the intersection region is equal to the axial width Wa, then the length L of the triangular region is 1*Wc. If the circumferential width Wc of the intersection region is greater than the axial width Wa, then the length L of the triangular region is 1*Wc; If the circumferential width Wc of the intersection region is less than the axial width Wa, then the length L of the triangular region is 1*Wa.
2. The method for controlling the spinning and folding of a cylindrical body with obliquely placed cross-ribs according to claim 1, characterized in that, Also includes: Step S4: If folds occur in the process supplement area of the part or the weight of the part exceeds the design specification value, then it shall be removed by machining.
3. The method for controlling the spinning and folding of a cylindrical body with obliquely placed cross-ribs according to claim 1, characterized in that, The length of the process supplement area is at least 0.5 times the maximum value of the circumferential width and axial width of the rib intersection area.
4. The method for controlling the spinning and folding of a cylindrical body with obliquely placed cross-ribs according to claim 1, characterized in that, The weight of the cross-ribbed cylinder after the addition of the process supplement area shall not exceed 3% of the original weight of the cross-ribbed cylinder.
5. The method for controlling the spinning and folding of a cylindrical body with obliquely placed cross-ribs according to claim 1, characterized in that, The finite element model is locally divided at the location of the ribs, so that the fillet of the ribs contains more than 6 meshes; the stress of the cross-rib tube after adding the process supplement area is less than the stress of the original cross-rib tube under the same load-bearing conditions.
6. A control system for spinning and folding obliquely arranged cross-ribbed cylindrical bodies, characterized in that, include: Module M1: Add a process supplement area below the rib; Module M2: Use the established finite element simulation model to evaluate the cross-ribbed cylinder after adding the process supplement area; Module M3: Based on the evaluation results, complete the part using the predetermined spinning process. Based on the relative motion between the inclined cross rib design and the predetermined rotating wheel, a process supplement area is added below the rib body; the process supplement area includes a triangular area with a horizontal bottom boundary. The process supplement area is added only at one corner at the intersection, which is located in the opposite direction of the wheel movement in the axial direction and on the side of the first filling in the circumferential direction; The length of the triangular region is set based on the circumferential width and axial width of the intersection region: If the circumferential width Wc of the intersection region is equal to the axial width Wa, then the length L of the triangular region is 1*Wc. If the circumferential width Wc of the intersection region is greater than the axial width Wa, then the length L of the triangular region is 1*Wc; If the circumferential width Wc of the intersection region is less than the axial width Wa, then the length L of the triangular region is 1*Wa.
7. The obliquely placed cross-ribbed cylindrical spinning and folding control system according to claim 6, characterized in that, Also includes: Module M4: If folds occur in the process supplement area of the part or the weight of the part exceeds the design specification value, then it will be removed by machining.