Method for designing grooving center distance of warping device of steel wire calender

Abstract

The invention provides a method for designing a grooving center distance of a warping device of a steel wire calender, which comprises the following steps of: establishing a linear regression equation model by using data of existing various specifications of steel wire cord fabrics with the same sizing material formula, inserting the known design breadth of the steel wire cord fabrics into the linear regression equation model, calculating the design breadth processed by the warping device, and calculating the grooving center distance of the warping device of the steel wire calender. And calculating the grooving center distance of the warping device according to the designed breadth of the warping device, and processing by taking the center distance as a standard. The actual breadth of the calendered and cooled wirecord fabric produced by the device tends to be consistent with the designed breadth of the wirecord fabric, and the slotting center distance of the warping device completely meets the design requirement. The method not only can be applied to improvement of warping devices of existing specifications, but also can be applied to new specifications, and cost waste is greatly reduced. And the density of the wirecord fabric processed by the warping device designed by the method is the same as that of the theoretically designed wirecord fabric after calendering and cooling.

Description

Technical Field

[0001] The invention relates to the technical field of tire steel cord calendering, and in particular to a method for designing a groove center distance of a warping device of a steel cord calender. Background Art

[0002] Steel cord is produced using a four-roll steel calender. After the steel cord is arranged in an orderly manner on a warping device, the mixed rubber strip is passed through the calender, with the 1# and 2# calendering rollers and the 3# and 4# calendering rollers forming a rubber sheet. The 2# and 3# calendering rollers then apply pressure to the upper and lower sides of the steel cord, forming a composite of steel cord and rubber called steel cord. Steel cord is a key structural material in tires, and the designed center distance of the slots in the warping device installed on the calender, that is, the density of the warping device, directly determines the density of the steel cord after calendering.

[0003] The safety multiple of an all-steel radial tire is an indicator of tire safety, focusing on the tire's structural design strength and reliability under load conditions. The safety multiple is determined by factors such as the tire's cord structure, steel cord density, and the number of plies. Therefore, controlling steel cord density is crucial, ensuring it not only meets actual product design requirements but also avoids excessive steel cord density, which could lead to excessive tire performance and waste of materials and resources.

[0004] The density design of the warping device on a calender in the prior art uses a center distance calculated based on the designed density of the steel cord as the standard for the working surface density design of the warping device. However, the density of the steel cord calendered using this prior art increases after cooling and shrinkage, resulting in significant material waste. Prior art (CN113792389A) discloses a method for calculating the slot density correction of a steel cord calender warping device. This method is only applicable to previously produced specifications and cannot provide guidance for new specifications. This not only affects the structural design and tire strength calculation, but also results in significant material waste. Summary of the Invention

[0005] To address the aforementioned issues, the present invention provides a method for designing the center distance between slots in a steel calender warping device. This method can be used to ensure that the actual density of the steel cord matches the designed density when processing new specifications of steel cord with the same rubber compound formulation, thereby resolving the technical issue of a significant discrepancy between the designed and actual density of the steel cord. This method improves the accuracy, rationality, and effectiveness of tire structural design strength calculations, preventing inaccurate steel cord density from leading to irrational structural design and cost waste.

[0006] The object of the present invention is achieved in the following manner: a method for designing the center distance of the slots of the warping device of a steel wire calender, using the actual widths of multiple specifications of steel wire cords with the same rubber compound formula and the corresponding design widths of the warping devices to establish a data model of the design width of the warping device and the design width of the steel wire cord, so that according to the design width of a certain specification of steel wire cord with the same rubber compound formula, the design width of the warping device of this specification is calculated, and then the center distance of the slots of the warping device of the steel wire calender is calculated.

[0007] A method for designing the center distance of slots in a warping device of a steel wire calender comprises the following steps: (1) Measure the actual width of multiple specifications of steel cord fabrics with the same rubber compound formula: A1, A2, A3, A4, A5...An; (2) Calculate the design width of the warping device for the corresponding steel cord specifications based on the slot center distance of each warping device design: C1, C2, C3, C4, C5...Cn; (3) Taking the actual width data of the multi-specification steel cord in step (1) as the design width data of the steel cord, and according to the design width data of the steel cord of the multi-specification steel cord and the design width data of the corresponding warping device, a linear regression equation model is established: y=a+bx, Where b is the slope, a is the intercept, y is the design width of the warping device, and x is the design width of the steel cord; (4) The design width data of a certain specification of steel cord with the same rubber compound formula is substituted into the above linear regression equation model to obtain the design width of the warping device. Then, based on the design width of the warping device, the center distance of the slots of the warping device for this specification of steel cord is obtained.

[0008] The step (2) calculates the design width of the warping device of the corresponding specification of the steel cord fabric according to the center distance of the slots of each specification of the warping device, specifically: C=N×B Where, C is C1, C2, C3, C4, C5...Cn, N is the number of spindles used for the corresponding specification of steel cord, and B is the center distance of the slots of the warping device of the corresponding specification.

[0009] The steps (1) and (2) include at least 6 or more different steel cord specifications.

[0010] The linear regression equation data model y=a+bx established in step (3); In the step (4), the design width of a certain specification of steel cord with the same rubber compound formula is: x=100×N0 / E Where x is the design width of the steel cord, E is the design density of the steel cord, and N0 is the number of spindles used for the steel cord; In the step (4), the center distance CD of the slots of the warping device of the steel cord is: CD=y0 / N0 Where y0 is the design width of the warping device for a certain specification of steel cord, N0 is the number of spindles used for this specification of steel cord, and CD is the center distance of the slots of the warping device for this specification of steel cord.

[0011] The center distance of the slots of the warping device is the standard for designing the working surface density of the warping device.

[0012] The steel cord is prepared by adopting a four-roller steel wire calender.

[0013] The warping device comprises a warping roller and a warping pressure roller, and the slotting densities of the rollers are the same.

[0014] Each specification of the steel cord corresponds to a set of warping devices.

[0015] Compared with the prior art, the technical effect of the present invention is as follows: the present invention provides a method for designing the center distance of the slots of the warping device of a steel wire calender, which uses data of existing steel cords of various specifications with the same rubber compound formula to establish a linear regression equation model, inputs the known design width of the steel cord into the linear regression equation model, calculates the design width of the warping device, and then calculates the center distance of the slots of the warping device based on the design width of the warping device, and processes the warping device based on this center distance as the standard. The actual width of the steel cord produced by the device after calendering and cooling is consistent with the design width of the steel cord, and the center distance of the slots of the warping device fully meets the design requirements. The method of the present invention can not only be applied to the improvement of warping devices of existing specifications, but can also be applied to new specifications, greatly reducing cost waste. Moreover, the density of the steel cord processed by the warping device designed by this method achieves the same density after calendering and cooling as the theoretical design density. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the warping rollers of a steel wire calender; Figure 2 It is a cross-sectional schematic diagram of the warping roller of the steel wire calender; Figure 3 This is a schematic diagram of the slot density and slot center distance CD of the warping roller of the steel wire calender; Figure 4 It is a schematic diagram of the steel wire density in steel cord.

[0017] Figure 5 is the fitted linear regression equation model. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to specific embodiments. It is necessary to point out that this embodiment is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Those skilled in the art in this field can make some non-essential improvements and adjustments based on the contents of the present invention.

[0019] A method for designing the center distance of slots in a warping device of a steel wire calender is provided. The method uses the actual widths of multiple specifications of steel cords with the same rubber compound formula and the corresponding design widths of the warping devices to establish a data model of the design widths of the warping devices and the design widths of the steel cords. Based on the design width of a certain specification of steel cords with the same rubber compound formula, the design width of the warping device of this specification is calculated, and then the center distance of slots in the warping device of the steel wire calender is calculated.

[0020] A method for designing the center distance of slots in a warping device of a steel wire calender comprises the following steps: (1) Measure the actual width of multiple specifications of steel cord fabrics with the same rubber compound formula: A1, A2, A3, A4, A5...An; (2) Calculate the design width of the warping device for the corresponding steel cord specifications based on the slot center distance of each warping device design: C1, C2, C3, C4, C5...Cn; (3) Taking the actual width data of the multi-specification steel cord in step (1) as the design width data of the steel cord, and according to the design width data of the steel cord of the multi-specification steel cord and the design width data of the corresponding warping device, a linear regression equation model is established: y=a+bx, Where b is the slope, a is the intercept, y is the design width of the warping device, and x is the design width of the steel cord; (4) The design width data of a certain specification of steel cord with the same rubber compound formula is substituted into the above linear regression equation model to obtain the design width of the warping device. Then, based on the design width of the warping device, the center distance of the slots of the warping device for this specification of steel cord is obtained.

[0021] The step (2) calculates the design width of the warping device of the corresponding specification of the steel cord fabric according to the center distance of the slots of each specification of the warping device, specifically: C=N×B Where, C is C1, C2, C3, C4, C5...Cn, N is the number of spindles used for the corresponding specification of steel cord, and B is the center distance of the slots of the warping device of the corresponding specification.

[0022] The steps (1) and (2) include at least 6 or more different steel cord specifications.

[0023] The linear regression equation data model y=a+bx established in step (3); In the step (4), the design width of a certain specification of steel cord with the same rubber compound formula is: x=100×N0 / E Where x is the design width of the steel cord, E is the design density of the steel cord, and N0 is the number of spindles used for the steel cord; In the step (4), the center distance CD of the slots of the warping device of the steel cord is: CD=y0 / N0 Where y0 is the design width of the warping device for a certain specification of steel cord, N0 is the number of spindles used for this specification of steel cord, and CD is the center distance of the slots of the warping device for this specification of steel cord.

[0024] The center distance of the slots of the warping device is the standard for designing the working surface density of the warping device.

[0025] The steel cord is prepared by adopting a four-roller steel wire calender.

[0026] The warping device comprises a warping roller and a warping pressure roller, and the slotting densities of the rollers are the same.

[0027] Each specification of the steel cord corresponds to a set of warping devices.

[0028] Specific implementation cases: like Figure 1 、 Figure 2 and Figure 3 As shown, the steel cord is calendered using a four-roll steel calender. A warping unit includes a warping roller and a warping pressure roller, each of which has the same grooving density. Each steel cord specification corresponds to a corresponding warping unit. The thickness of the steel cord selected during data collection meets process standards, the temperature of each zone of the calender meets process requirements and is stable, the tension of each zone during production meets process requirements and is stable, and the Mooney viscosity of the rubber used for calendering meets process requirements and is stable.

[0029] The present application provides a method for designing the center distance of slots in a warping device of a steel wire calender; the method comprises the following steps: Step (1): Measure the actual width of the six types of steel cord fabrics as follows: The design density of steel cord 1 is 45 strands / dm, the number of calendering spindles per batch is N=396, the center distance of the slots of the warping device of steel cord 1 is 2.262 mm, and the actual width after cooling is measured to be 877 mm; The design density of steel cord 2 is 55 strands / dm, the number of calendering spindles per batch is N=504, the center distance of the slots of the warping device of steel cord 2 is 1.846 mm, and the actual width after cooling is measured to be 907 mm; The design density of the steel cord 3 is 70 strands / dm, the number of calendering spindles per batch is N=540, the center distance of the slots of the warping device of the steel cord 3 is 1.457 mm, and the actual width after cooling is measured to be 770 mm; The design density of the steel cord 4 is 55 strands / dm, the number of calendering spindles per batch is N=504, the center distance of the slots of the warping device of the steel cord 4 is 1.820 mm, and the actual width after cooling is measured to be 894 mm; The design density of the steel cord 5 is 60 strands / dm, the number of calendering spindles per batch is N=540, the center distance of the slots of the warping device of the steel cord 5 is 1.667 mm, and the actual width after cooling is measured to be 879 mm; The design density of the steel cord 6 is 60 strands / dm, the number of calendering spindles per batch is N=540, the center distance of the slots of the warping device of the steel cord 6 is 1.695 mm, and the actual width after cooling is measured to be 889 mm; Step (2): Calculate the design widths of the above 6 types of steel cord fabrics as follows: The center distance of the slots in the warping device of steel cord 1 is 2.262 mm, the number of calendering spindles per batch N = 396, and the design width of the warping device is calculated to be 896 mm; The center distance of the slots in the warping device of steel cord 2 is 1.846 mm, the number of calendering spindles per batch N = 504, and the design width of the warping device is calculated to be 930 mm; The center distance of the slots in the warping device of steel cord 3 is 1.457 mm, the number of calendering spindles per batch N = 540, and the design width of the warping device is calculated to be 787 mm; The center distance of the slots in the warping device for steel cord 4 is 1.820 mm, the number of calendering spindles per batch N = 504, and the design width of the warping device is calculated to be 917 mm; The center distance of the slots in the warping device for steel cord 5 is 1.667 mm, the number of calendering spindles per batch is N = 540, and the design width of the warping device is calculated to be 900 mm; The center distance of the slots in the warping device for steel cord 6 is 1.695 mm, the number of calendering spindles per batch N = 540, and the design width of the warping device is calculated to be 915 mm; Step (3): take the actual width data of the multi-specification steel cord fabrics in step (1) as the design width data of the steel cord fabrics, such as Figure 5As shown in the figure, based on the design width data of steel cords of multiple specifications and the design width data of the corresponding warping devices, a linear regression equation model is obtained by fitting: y = - 24.1 + 1.05x; y is the design width of the warping device, and x is the design width of the steel cord; (4) Based on the above regression equation model and the design width of a certain specification of steel cord with the same rubber compound formula, calculate the center distance of the slots of the warping device of this specification of steel cord: Example 1: The design density of the processed steel cord is E = 60 pieces / dm, the number of calendering spindles per batch is N0 = 540, and the design width x of the steel cord is calculated as 900mm according to x = 100 × N0 / E; Then, according to the linear regression equation model: y = - 24.1 + 1.05x, the design width of the warping device is calculated to be 920.9 mm.

[0030] The design width of the warping device, 920.9 mm, is introduced into the following expression to obtain the center distance of the slots of the warping device, as follows: Figure 3 The length of the CD.

[0031] According to CD=y0 / N0, the design width of the warping device is y0=920.9mm, N0=540; The calculated center distance CD of the slots of the warping device is 1.705 mm. The actual width of the steel cord calendered by the warping device designed according to this center distance is 901 mm, and the density of the steel cord is measured to be 60 strands / dm.

[0032] Therefore, the actual width of the steel cord produced by the device after calendering and cooling is consistent with the designed width of the steel cord, and the center distance of the slots in the warping device fully meets the design requirements. Moreover, the density of the steel cord processed by the warping device designed by this method achieves the same density after calendering and cooling as the theoretical design density. Figure 4 shown.

[0033] Example 2: The design density E of the processed steel cord is 55 pieces / dm, the number of calendering spindles per batch is N0=504, and the design width x of the steel cord is calculated as 916mm according to x=100×N0 / E; Then, according to the linear regression equation model: y = - 24.1 + 1.05x, the design width of the warping device is calculated to be 938.1 mm; The design width of the warping device, 938.1 mm, is introduced into the following expression to obtain the center distance of the slots of the warping device, as follows: Figure 3 The length of the CD.

[0034] According to CD=y0 / N0, the design width of the warping device is y0=938.1mm, N0=504; The calculated slot center distance CD of the warping device is 1.861 mm. The actual width of the steel cord calendered by the warping device designed according to this center distance is 915 mm. The density of the steel cord is measured to be 55 strands / dm.

[0035] Therefore, the actual width of the steel cord produced by the device after calendering and cooling is consistent with the designed width of the steel cord, and the center distance of the slots in the warping device fully meets the design requirements. Moreover, the density of the steel cord processed by the warping device designed by this method achieves the same density after calendering and cooling as the theoretical design density. Figure 4 shown.

[0036] In summary, the present invention provides a method for designing the center distance of the slots of the warping device of a steel wire calender. A data model is established in the form of a regression equation to obtain the correlation between the design width of the steel cord and the design width of the warping device. According to the regression equation, the design standard for the center distance of the slots of warping devices of different specifications is obtained. According to this standard, the width of the cooled steel cord is finally consistent with the design width of the steel cord. Through the technical solution of the present invention, the center distance CD of the slots of the warping roller and the warping pressure roller of the warping device can be calculated simply and accurately, thereby obtaining the calendered and cooled steel cord that is consistent with the design width of the steel cord.

[0037] The method of the present invention is simple, practical, and convenient, with promising application prospects. The warping device designed using this method can not only be used to improve existing warping devices but also be applied to new specifications, significantly reducing processing costs. It can also effectively ensure the reliability of the safety factor of the tire structure design and the accuracy of material consumption.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. It should be pointed out that for those skilled in the art and any technician familiar with this technical field, without departing from the overall concept of the present invention, the technical solution and the inventive concept of the present invention are equivalently replaced or changed, and several changes and improvements are made, which should also be regarded as the scope of protection of the present invention.

Claims

1. A method for designing the center distance of slots in a warping device of a steel wire calender, characterized by: The actual widths of multiple specifications of steel cords with the same rubber compound formula and the design widths of the corresponding warping devices are used to establish a data model of the design width of the warping device and the design width of the steel cord. Based on the design width of a certain specification of steel cord with the same rubber compound formula, the design width of the warping device of this specification is calculated, and then the slot center distance of the warping device of the steel calender is calculated.

2. The method for designing the center distance of slots of a warping device of a steel wire calender according to claim 1, characterized in that: The following steps are included: (1) Measure the actual width of multiple specifications of steel cord fabrics with the same rubber compound formula: A1, A2, A3, A4, A5...An; (2) Calculate the design width of the warping device for the corresponding steel cord specifications based on the slot center distance of each warping device design: C1, C2, C3, C4, C5...Cn; (3) Taking the actual width data of the multi-specification steel cord in step (1) as the design width data of the steel cord, and according to the design width data of the steel cord of the multi-specification steel cord and the design width data of the corresponding warping device, a linear regression equation model is established: y=a+bx, Where b is the slope, a is the intercept, y is the design width of the warping device, and x is the design width of the steel cord; (4) The design width data of a certain specification of steel cord with the same rubber compound formula is substituted into the above linear regression equation model to obtain the design width of the warping device; then, based on the design width of the warping device, the center distance of the slots of the warping device for this specification of steel cord is obtained.

3. The method for designing the center distance of slots of a warping device of a steel wire calender according to claim 2, characterized in that: The step (2) calculates the design width of the warping device of the corresponding specification of the steel cord fabric according to the center distance of the slots of each specification of the warping device, specifically: C=N×B Where, C is C1, C2, C3, C4, C5...Cn, N is the number of spindles used for the corresponding specifications of steel cord, and B is the slot center distance designed for the corresponding specifications of the warping device.

4. The method for designing the center distance of slots in a warping device of a steel wire calender according to claim 2, characterized in that: The steps (1) and (2) include at least 6 or more different steel cord specifications.

5. The method for designing the center distance of slots of a warping device of a steel wire calender according to claim 2, characterized in that: The linear regression equation data model y=a+bx established in step (3) is 6. The method for designing the center distance of slots of a warping device of a steel wire calender according to claim 2, characterized in that: Said step (4), The design width of a certain specification of steel cord with the same rubber compound formula is: x=100×N0 / E Where x is the design width of the steel cord, E is the design density of the steel cord, and N0 is the number of spindles used for the steel cord; In the step (4), the center distance CD of the slots of the warping device of the steel cord is: CD=y0 / N0 Where y0 is the design width of the warping device for a certain specification of steel cord, N0 is the number of spindles used for this specification of steel cord, and CD is the center distance of the slots of the warping device for this specification of steel cord.

7. The method for designing the center distance of slots in a warping device of a steel wire calender according to claim 2, characterized in that: The center distance of the slots of the warping device is the standard for designing the working surface density of the warping device.

8. The method for designing the center distance of slots in a warping device of a steel wire calender according to claim 2, characterized in that: The steel cord is prepared by adopting a four-roller steel wire calender.

9. The method for designing the center distance of slots in a warping device of a steel wire calender according to claim 2, characterized in that: The warping device comprises a warping roller and a warping pressure roller, and the slotting densities of the rollers are the same.

10. The method for designing the center distance of slots in a warping device of a steel wire calender according to claim 9, characterized in that: Each specification of the steel cord corresponds to a set of warping devices.

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