Eccentric knitting control method and storage device
Through the eccentric braiding control method, the eccentricity value of the core mold is adjusted according to preset needs, and the braiding process of the bending core mold is optimized, which solves the problem of sparse and stacking of fabrics in the braiding of special-shaped structural core molds, and improves the coverage balance.
Patent Information
- Application Number
- CN202111174482.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-10-09
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2041-10-09
AI Technical Summary
When weaving a special-shaped core mold, due to the unequal axial length of the surface of the curved core mold, the fabrics are sparse and stacked in the preform, which is difficult to effectively solve the problem in the prior art.
Through the eccentric weaving control method, the appropriate eccentricity value is selected according to the preset needs, the core mold is adjusted at the initial moment of the bending stage, the coverage change value under different eccentric values is calculated, and the eccentricity-coverage change curve chart is generated, and the appropriate Eccentricity to optimize the weaving process.
Effectively reduce the coverage of the inner surface of the curved core mold, improve the coverage of the outer surface, and improve the fiber distribution of the preform.
Smart Images
Figure CN114003277B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of weaving, and in particular to an eccentric weaving control method and a storage device. Background Art
[0002] When weaving special-shaped core molds, especially core molds with large bending angles of the central axis, the robot supports the core mold according to the set trajectory, and always passes vertically through the center of the projection of the guide ring on the landing plane of the yarn, that is, the weaving point plane. This weaving method can theoretically ensure the accuracy of the weaving angle and coverage of the preform. However, in actual production, since the axial length of the curved core mold surface is not equal in the circumferential direction, weaving always vertically through the center of the weaving point plane will cause the preform to have sparse fabric, fabric accumulation and other phenomena. Summary of the invention
[0003] Therefore, it is necessary to provide an eccentric braiding control method to solve the technical problem that in the existing braiding mode, since the axial length of the curved core mold surface is not equal in the circumferential direction, braiding always vertically through the center of the braiding point plane will cause the preform to have sparse fabrics, fabric accumulation and other phenomena. The specific technical solution is as follows:
[0004] An eccentric knitting control method comprises the steps of:
[0005] Select the corresponding eccentricity value according to the preset requirements;
[0006] The weaving is performed after the core mold is adjusted according to the eccentricity value at the initial moment of entering the bending stage.
[0007] Furthermore, before the step of “selecting a corresponding eccentricity value according to preset requirements”, the following steps are specifically included:
[0008] At the initial moment of entering the bending stage, different eccentricity values are adjusted to weave the core mold, and the coverage rate change values under different eccentricity values are calculated respectively to generate an eccentricity value-coverage rate change curve diagram;
[0009] The “selecting a corresponding eccentricity value according to preset requirements” specifically includes the following steps:
[0010] Obtain coverage change requirements based on preset requirements;
[0011] According to the coverage change requirement, a corresponding eccentricity value is selected in the eccentricity value-coverage change curve diagram.
[0012] In order to solve the above technical problems, a storage device is also provided, and the specific technical solution is as follows:
[0013] A storage device stores an instruction set, wherein the instruction set is used to execute: selecting a corresponding eccentricity value according to a preset requirement;
[0014] The weaving is performed after the core mold is adjusted according to the eccentricity value at the initial moment of entering the bending stage.
[0015] Furthermore, the instruction set is also used to execute:
[0016] Before the step of “selecting the corresponding eccentricity value according to the preset requirements”, the method further includes the following steps:
[0017] At the initial moment of entering the bending stage, different eccentricity values are adjusted to weave the core mold, and the coverage rate change values under different eccentricity values are calculated respectively to generate an eccentricity value-coverage rate change curve diagram;
[0018] The “selecting a corresponding eccentricity value according to preset requirements” specifically includes the following steps:
[0019] Obtain coverage change requirements based on preset requirements;
[0020] According to the coverage change requirement, a corresponding eccentricity value is selected in the eccentricity value-coverage change curve diagram.
[0021] The beneficial effect of the present invention is: an eccentric braiding control method, comprising the steps of: selecting a corresponding eccentric value according to a preset requirement; and braiding after adjusting the core mold according to the eccentric value at the initial moment of entering the bending stage. After using the above eccentric braiding method, the coverage rate of the inner surface of the bending core mold can be greatly reduced, and the coverage rate of the outer surface can be increased. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a flow chart of an eccentric knitting control method described in a specific implementation manner;
[0023] Figure 2 It is a schematic diagram of the eccentric braiding process described in the specific implementation method;
[0024] Figure 3 It is a schematic diagram of the geometric relationship between the core mold, the yarn and the guide ring under the eccentric condition described in the specific implementation method;
[0025] Figure 4 It is a schematic diagram of the geometric features of the bending mandrel described in the specific implementation method;
[0026] Figure 5 This is a schematic diagram of the eccentric braiding basic unit described in the specific implementation method;
[0027] Figure 6 A module schematic diagram of a storage device described in a specific implementation manner.
[0028] Description of reference numerals:
[0029] 600. Storage device. DETAILED DESCRIPTION
[0030] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.
[0031] See also Figures 1 to 5 In this embodiment, an eccentric knitting control method can be applied to a storage device. In this embodiment, the storage device takes a knitting machine as an example. The following is a detailed description:
[0032] An eccentric knitting control method comprises the steps of:
[0033] Step S101: Select a corresponding eccentricity value according to preset requirements.
[0034] Step S102: adjusting the core mold according to the eccentricity value at the initial moment of entering the bending stage and then weaving.
[0035] It should be noted that before the step of “selecting a corresponding eccentricity value according to preset requirements”, the following steps are specifically included:
[0036] At the initial moment of entering the bending stage, different eccentricity values are adjusted to weave the core mold, and the coverage rate change values under different eccentricity values are calculated respectively to generate an eccentricity value-coverage rate change curve diagram;
[0037] The “selecting a corresponding eccentricity value according to preset requirements” specifically includes the following steps:
[0038] Obtain coverage change requirements based on preset requirements;
[0039] According to the coverage change requirement, a corresponding eccentricity value is selected in the eccentricity value-coverage change curve diagram.
[0040] The following is a detailed description of the calculation process and principle process:
[0041] like Figure 2 As shown, when the core mold passes vertically through the center of the weaving point plane under eccentric conditions and the ratio of the main machine speed to the traction speed remains constant, the structure of the fabric formed in different directions is different, and the weaving angles at different locations in the circumferential direction of the core mold are different, resulting in different convergence lengths and coverage rates when the yarn weaving is stable.
[0042] When there is an eccentricity value e, the relationship between the yarn on the guide ring and the landing point on the core mold during weaving is as follows: Figure 3 As shown, by analyzing the angles of the center of the guide ring and the center of the core mold, we can obtain the angle position θ of the landing point in the polar coordinate system with the center of the core mold as the origin and the angle position θ of the landing point in the polar coordinate system with the center of the guide ring as the origin. g relationship.
[0043] Figure 3 The figure shows the geometric relationship between the core mold, yarn and guide ring in the case of eccentricity. During the weaving process, the weaving angle is related to the angular velocity of the yarn wrapped around the core mold and the axial pulling speed. On the guide ring, the angular velocity of the yarn is ω. However, in the case of eccentricity, the weaving speed of the yarn on the core mold along the circumferential direction is ω. θ The formula is as follows:
[0044]
[0045] At the same time, the axial length of the bending core mold surface is different, such as Figure 4 As shown in the figure, when the robot clamps the core mold and passes through the weaving point plane vertically at a constant pulling speed V, since the length of the core mold required to be woven is different in the same time, the pulling speed of each point in the circumferential direction of the core mold is different, and the speed V corresponding to different positions is θ for:
[0046]
[0047] Where, L θ is the axial length of the surface corresponding to the angle θ in the mandrel coordinate system; L is the length of the center line of the curved mandrel. Therefore, the braiding angle α corresponding to different angle positions in the circumferential direction of the mandrel can be obtained. θ .
[0048] By adjusting the eccentricity value e at the initial moment of entering the bending stage, different braiding angles α can be obtained in the circumferential direction through formula (3): θ , and then calculated by the coverage formula under eccentricity, the fiber wrinkle phenomenon on the inner end surface of the preform can be effectively improved. The coverage is calculated by Figure 5 The basic compilation unit shown is used for calculation, and the formula is as follows:
[0049]
[0050]
[0051] In the formula, α min =min(α1,α2);α max =max(α1,α2);X n Y is the length of the compilation unit along the circumferential direction; n It is the axial spacing of yarn units at different positions in the circumferential direction.
[0052] set up and In the core mold polar coordinate system, the upper surface and the lower surface of the bending core mold are respectively substituted into equation (1) and equation (4) to obtain the relationship between the coverage C1 and C2 of the upper surface and the lower surface of the core mold and the eccentricity value e. The curve diagram of the coverage change under different eccentricity values e is obtained by calculation. According to the specific weaving process requirements, the eccentricity value e required for weaving is selected.
[0053] After using the above eccentric weaving method, the coverage rate of the inner surface of the bending core mold can be greatly reduced, and the coverage rate of the outer surface can be increased.
[0054] See also Figures 2 to 6 In this embodiment, a specific implementation of a storage device 600 is as follows:
[0055] A storage device 600, wherein an instruction set is stored, wherein the instruction set is used to execute: selecting a corresponding eccentricity value according to a preset requirement;
[0056] The weaving is performed after the core mold is adjusted according to the eccentricity value at the initial moment of entering the bending stage.
[0057] Furthermore, the instruction set is also used to execute:
[0058] Before the step of “selecting the corresponding eccentricity value according to the preset requirements”, the method further includes the following steps:
[0059] At the initial moment of entering the bending stage, different eccentricity values are adjusted to weave the core mold, and the coverage rate change values under different eccentricity values are calculated respectively to generate an eccentricity value-coverage rate change curve diagram;
[0060] The “selecting a corresponding eccentricity value according to preset requirements” specifically includes the following steps:
[0061] Obtain coverage change requirements based on preset requirements;
[0062] According to the coverage change requirement, a corresponding eccentricity value is selected in the eccentricity value-coverage change curve diagram.
[0063] The following is a detailed description of the calculation process and principle process:
[0064] like Figure 2 As shown, when the core mold passes vertically through the center of the weaving point plane under eccentric conditions and the ratio of the main machine speed to the traction speed remains constant, the structure of the fabric formed in different directions is different, and the weaving angles at different locations in the circumferential direction of the core mold are different, resulting in different convergence lengths and coverage rates when the yarn weaving is stable.
[0065] When there is an eccentricity value e, the relationship between the yarn on the guide ring and the landing point on the core mold during weaving is as follows: Figure 3As shown, by analyzing the angles of the center of the guide ring and the center of the core mold, we can obtain the angle position θ of the landing point in the polar coordinate system with the center of the core mold as the origin and the angle position θ of the landing point in the polar coordinate system with the center of the guide ring as the origin. g relationship.
[0066] Figure 3 The figure shows the geometric relationship between the core mold, yarn and guide ring in the case of eccentricity. During the weaving process, the weaving angle is related to the angular velocity of the yarn wrapped around the core mold and the axial pulling speed. On the guide ring, the angular velocity of the yarn is ω. However, in the case of eccentricity, the weaving speed of the yarn on the core mold along the circumferential direction is ω. θ The formula is as follows:
[0067]
[0068] At the same time, the axial length of the bending core mold surface is different, such as Figure 4 As shown in the figure, when the robot clamps the core mold and passes through the weaving point plane vertically at a constant pulling speed V, since the length of the core mold required to be woven is different in the same time, the pulling speed of each point in the circumferential direction of the core mold is different, and the speed V corresponding to different positions is θ for:
[0069]
[0070] Where, L θ is the axial length of the surface corresponding to the angle θ in the mandrel coordinate system; L is the length of the center line of the curved mandrel. Therefore, the braiding angle α corresponding to different angle positions in the circumferential direction of the mandrel can be obtained. θ .
[0071] By adjusting the eccentricity value e at the initial moment of entering the bending stage, different braiding angles α can be obtained in the circumferential direction through formula (3): θ , and then calculated by the coverage formula under eccentricity, the fiber wrinkle phenomenon on the inner end surface of the preform can be effectively improved. The coverage is calculated by Figure 5 The basic compilation unit shown is used for calculation, and the formula is as follows:
[0072]
[0073]
[0074] In the formula, α min =min(α1,α2);α max =max(α1,α2);X n Y is the length of the compilation unit along the circumferential direction; n It is the axial spacing of yarn units at different positions in the circumferential direction.
[0075] set up and In the core mold polar coordinate system, the upper surface and the lower surface of the bending core mold are respectively substituted into equation (1) and equation (4) to obtain the relationship between the coverage C1 and C2 of the upper surface and the lower surface of the core mold and the eccentricity value e. The curve diagram of the coverage change under different eccentricity values e is obtained by calculation. According to the specific weaving process requirements, the eccentricity value e required for weaving is selected.
[0076] The method executed by the instruction set of the storage device 600 can greatly reduce the coverage rate of the inner surface of the bending core mold and increase the coverage rate of the outer surface.
[0077] It should be noted that, although the above embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present invention specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the patent protection scope of the present invention.
Claims
1. An eccentric weaving control method, characterized in that: Includes steps: Select the corresponding eccentricity value according to the preset requirements; Weaving is performed after adjusting the core mold according to the eccentricity value at the initial moment of entering the bending stage; Before selecting the corresponding eccentricity value according to the preset requirements, the method further includes the following steps: At the initial moment of entering the bending stage, different eccentricity values are adjusted to weave the core mold, and the coverage rate change values under different eccentricity values are calculated respectively to generate an eccentricity value-coverage rate change curve diagram; The step of selecting the corresponding eccentricity value according to the preset requirements specifically includes the following steps: Obtain coverage change requirements based on preset requirements; According to the coverage change requirement, a corresponding eccentricity value is selected in the eccentricity value-coverage change curve diagram; The method of adjusting different eccentricity values to weave the core mold at the initial moment of entering the bending stage, and calculating the coverage change values under different eccentricity values respectively to generate an eccentricity value-coverage change curve diagram specifically includes the steps of: In the case of eccentricity, calculate the weaving speed of the yarn on the mandrel in the circumferential direction; Calculate the braiding angles corresponding to different angular positions in the circumferential direction of the core mold; Coverage calculation is performed through basic weaving units; Calculate the coverage change under different eccentricity values and generate an eccentricity value-coverage change curve.
2. A storage device having an instruction set stored therein, characterized in that: The instruction set is used to execute: selecting a corresponding eccentricity value according to preset requirements; Weaving is performed after adjusting the core mold according to the eccentricity value at the initial moment of entering the bending stage; Before selecting the corresponding eccentricity value according to the preset requirements, the method further includes the following steps: At the initial moment of entering the bending stage, different eccentricity values are adjusted to weave the core mold, and the coverage rate change values under different eccentricity values are calculated respectively to generate an eccentricity value-coverage rate change curve diagram; The step of selecting the corresponding eccentricity value according to the preset requirements specifically includes the following steps: Obtain coverage change requirements based on preset requirements; According to the coverage change requirement, a corresponding eccentricity value is selected in the eccentricity value-coverage change curve diagram; The method of adjusting different eccentricity values to weave the core mold at the initial moment of entering the bending stage, and calculating the coverage change values under different eccentricity values respectively to generate an eccentricity value-coverage change curve diagram specifically includes the steps of: In the case of eccentricity, calculate the weaving speed of the yarn on the mandrel in the circumferential direction; Calculate the braiding angles corresponding to different angular positions in the circumferential direction of the core mold; Coverage calculation is performed through basic weaving units; Calculate the coverage change under different eccentricity values and generate an eccentricity value-coverage change curve.