Device and method for detecting spiral bending deformation capability of steel wire

Abstract

The invention belongs to the technical field of metal material performance testing, and particularly discloses a steel wire spiral bending deformability detection device which comprises a vertically arranged panel, a pre-deformer and a plurality of guide wheels connected to the panel, the pre-deformer can be replaced, one end of a to-be-detected monofilament is connected with a weight, the weight naturally droops under the action of gravity, and the guide wheels are connected to the panel. And the free end of the monofilament to be detected is pulled by a hand or a tractor after penetrating through the guide wheels and the pre-deformer, so that the monofilament to be detected forms a spiral. Compared with the prior art, the device for detecting the spiral bending deformation capability of the steel wire is purely mechanical, does not need an external power supply and is convenient to use on site. The device is a special detection device capable of converting the hardening degree of the monofilament into visible and measurable spiral form difference, and further converting the fuzzy complaint of hardening into clear and quantifiable spiral coil diameter and screw pitch data, so that an objective basis is provided for quality problem identification.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metal material performance testing, and particularly relates to a device and method for detecting spiral bending deformation capacity of steel wire. BACKGROUND

[0002] The production of steel cord and reinforcing wire (hose wire) for high-pressure hoses has long faced a thorny product quality problem: some batches of monofilaments exhibit "hardening" in subsequent processing or finished products. This "hardening" is not simply a matter of hand feel, but is reflected in poor bending flexibility during hose forming, poor cord penetration, fluctuation in finished product fatigue life, and other aspects, seriously affecting the performance and reliability of the final product.

[0003] Traditionally, "hardening" is a vague qualitative description, and its root points to the abnormal increase in the macro-rigidity of the monofilament material. Currently, for the quantification of steel wire rigidity, the industry relies on classical material mechanics tests in the laboratory, such as tensile rigidity, bending rigidity, and Taber rigidity. However, these methods have high technical costs and high complexity, and face serious faults in actual production quality control: (1) Disconnected from the on-site process, unable to quickly diagnose problems: laboratory rigidity data is a basic material parameter and cannot directly and intuitively predict the specific performance of the monofilament in a specific twisting process. When hose forming is difficult or cord performance is degraded, it is impossible to quickly determine whether the problem is caused by "hardening" of the raw material or improper process parameters, resulting in delayed problem identification.

[0004] (2) Difficult to use for routine incoming materials and process inspection: the high cost of equipment, complex operation requirements, and long testing period make it impossible for laboratory rigidity testing to be included as a routine item in raw material incoming inspection or production site inspection. Therefore, for the key process attribute of "rigidity / softness", there is actually a lack of effective real-time monitoring means in the production process.

[0005] Therefore, there is an urgent need for a device for detecting the spiral bending deformation capacity of steel wire. SUMMARY

[0006] The purpose of the present application is to overcome the shortcomings of the prior art and provide a pure mechanical device for detecting the spiral bending deformation capacity of steel wire without the need for external power supply and convenient for on-site use. The device can convert the "hardening" degree (i.e., abnormal rigidity) of the monofilament into a special detection device for visible and measurable differences in spiral shape, which meets the urgent need for precise quality control to solve the above-mentioned quality problems, and further converts the vague complaint of "hardening" into clear and quantifiable "spiral diameter and pitch" data, providing an objective basis for quality problem identification.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A device for detecting the bending deformation capacity of steel wire spirals includes a base, a column, a panel, a pre-deformer, multiple guide wheels, and weights.

[0008] The base is a rectangular metal plate, providing a stable foundation for the entire device. The uprights are vertically fixed to the base. The panel is a rectangular metal plate, vertically fixed to the upper part of the uprights, and its front is used to mount all functional components.

[0009] The pre-deformer is secured to the center of the panel via a stepped hole. This pre-deformer is a quick-change design, offering a range of modules with different diameters.

[0010] Multiple guide rollers are used to guide and constrain the path of the steel wire. There are four guide rollers in total, all fixed to the front of the panel. The specific layout and sequence of the guide rollers create a unique force transmission path. The first guide wheel, serving as the initial load-bearing guide wheel, is installed in the lower left corner of the panel and has a diameter of 50-200mm. The starting end of the steel wire is first connected to the weight, and then it winds upwards around this guide wheel. This guide wheel and the steel wire bear the initial weight of the weight and guide the steel wire to the upper inner side of the panel.

[0011] The second guide wheel is a steering guide wheel, installed in the middle of the left side of the panel, above and to the right of the first guide wheel, with a diameter of 30-50mm. This guide wheel is used to receive the steel wire from the first guide wheel and steer it towards the top of the panel.

[0012] The third guide wheel is a top guide wheel, installed at the top center or slightly to the right of the panel, with a diameter of 30-50mm. This guide wheel is used to horizontally guide the steel wire from the second guide wheel to the inlet direction of the pre-deformer.

[0013] The fourth guide wheel is the outlet guide wheel, installed on the lower right side of the panel, with a diameter of 50-200mm. It is used to receive the steel wire passing through the pre-deformer outlet and change its direction, extending it horizontally to the right or diagonally downwards out of the panel for the operator to pull by hand or with a traction device.

[0014] The center lines of the grooves of all guide wheels must be precisely aligned to ensure that the steel wire travels smoothly and stably without jamming or abnormal friction.

[0015] The weights are standard gravity weights, and their function is to provide the initial tension and reference load for the entire testing system. One end of the steel wire is first fixedly connected to the weights.

[0016] The complete path of the steel wire to be tested is as follows: the starting end of the steel wire is connected to a weight → it goes up and around the first guide wheel at the lower left of the panel → it goes around the second guide wheel at the middle of the left side → it goes around the third guide wheel at the top of the panel → it goes horizontally through the pre-deformer → it goes out from the pre-deformer outlet and then around the fourth guide wheel at the lower right of the panel → the free end of the steel wire is pulled by the operator using his hand or a traction device.

[0017] During testing, the operator uses their hand or a puller to tug the free end of the steel wire, pulling it outwards at a uniform speed. During this process, the gravity of the weights is transmitted through the guide wheel system, providing a stable initial tension to the wire before it reaches the pre-deformer. As the wire is pulled through the pre-deformer, forced bending plastic deformation occurs. As the wire is continuously pulled out, behind the pre-deformer exit, under the combined effect of the tensile tension and the material memory effect, the wire naturally forms a section with a stable spiral diameter. D and helix pitch P The monofilament has a helical structure. By measuring the geometric parameters of this helical segment, the helical bending deformation capability of the monofilament can be evaluated.

[0018] The beneficial effects of this invention are: This device features a highly simplified yet mechanically sound test path (weights → guide wheel assembly → pre-deformer → manual pulling). This path accurately replicates the core mechanical scenario of "forced bending under constant tension" experienced by the monofilament during the process. It can directly amplify and solidify the bending resistance and strong recovery characteristics caused by high stiffness ("hardening") into a visible and measurable spiral geometric anomaly (circumference). D Increase pitch P (widening).

[0019] This device transforms the subjective feeling of "stiffness" into the objective spiral diameter. D ) and pitch ( P The measured values ​​were used to establish the relationship between "high stiffness / hardening" and "large" stiffness. D Value, large P This establishes a definite correspondence between the "values." This allows the description of the degree of "hardening" to move from qualitative to quantitative, providing a unified and clear basis for quality communication and standard setting.

[0020] This device achieves a balance between minimalist mechanical structure and process reproducibility. It eliminates all electronic sensors and complex control systems, and innovatively utilizes a combination of weight gravity, fixed guide wheel path, and replaceable deformable device to stably and repeatably reproduce key process stress states in a purely mechanical and low-cost manner, ensuring the reliability of the test and the zero-maintenance characteristics of the device. Attached Figure Description

[0021] Figure 1 This is a front view of the overall structure of the present invention.

[0022] In the diagram: 1-panel, 2-pre-deformer, 3-weight, 4-steel wire, 5-first guide wheel, 6-second guide wheel, 7-third guide wheel, 8-fourth guide wheel, 9-column, 10-base. Detailed Implementation

[0023] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 As shown, this invention discloses a device for detecting the spiral bending deformation capacity of steel wire, including a base 10, a column 9, a panel 1, a pre-deformer 2, four guide wheels, and a weight 3. It should be noted that the starting point for the steel wire 4 to pass through is the weight 3.

[0025] The positions of the four guide wheels on panel 1 are determined according to the new path: First guide wheel 5, Φ 50-200mm, installed at the lower left corner of panel 1.

[0026] Second guide wheel 6, Φ 30-50mm, installed on the left side of panel 1, above and to the right of the first guide wheel 5.

[0027] Third guide wheel 7, Φ 30-50mm, installed at the top center of panel 1.

[0028] Fourth guide wheel 8, Φ 50-200mm, installed on the lower right of panel 1.

[0029] The pre-deformer 2 is horizontally fixed on the panel 1, located between the third guide wheel 7 and the fourth guide wheel 8, with its center height aligned with the tangent of the groove of the two guide wheels.

[0030] The operating steps during testing are as follows: Step 1, Sample and apparatus preparation: Cut a piece of steel wire 4 about 2m long to be tested, select a pre-deformer 2 of the required diameter and install and fix it, and prepare weights 3 of the specified weight.

[0031] Step 2, Connecting Weight 3 to Threading: Securely connect one end of the wire 4 to the ring of the weight 3 (e.g., by tying a knot or using a miniature clamp). Then, thread the wire 4 through the ring in sequence: a. From bottom to top, around the first guide wheel 5 at the lower left of panel 1.

[0032] b. Move to the upper right, around the second guide wheel 6 in the middle of the left side.

[0033] c. Move horizontally to the right (or slightly to the lower right), around the third guide wheel 7 at the top of panel 1.

[0034] d. Pass horizontally through pre-deformer 2.

[0035] e. After exiting from the pre-deformer 2, it moves to the lower right and around the fourth guide wheel 8 at the lower right.

[0036] At this time, the weight 3 is suspended on the left side of the device, and the free end of the steel wire 4 is led out from the fourth guide wheel 8 and pulled by the operator using his hand or a traction device.

[0037] Step 3, Pull Test and Spiral Formation: The operator uses their hand or a puller to pull the free end of the steel wire 4 horizontally to the right at a slow, uniform speed (e.g., approximately 100 mm / s). As the steel wire 4 is pulled out, the weight 3 is lifted, and its gravity is converted into a tensile force on the steel wire 4 through the guide wheel system. When the steel wire 4 passes through the pre-deformer 2, it undergoes bending deformation, and during the process of being straightened after its exit, a stable spiral is formed in the section between the pre-deformer 2 and the fourth guide wheel 8 due to the elastic recovery effect of the material.

[0038] Step 4, Observation and Measurement: Once the helical segment has formed and stabilized, stop pulling or continue pulling slowly to maintain the helical shape. The operator can: - Directly observe the uniformity and morphology of the spiral.

[0039] - Perform the measurement: Use vernier calipers to measure the diameter of the helical section. D and pitch P .

[0040] Step 5, Result Judgment: By quantitatively comparing the characteristic parameter D value and P value measured by different steel wire 4 samples, the ability of each steel wire 4 to resist helical bending deformation is comprehensively evaluated.

[0041] Example 1: Comparison of the resistance to helical bending deformation of steel wires 4 of different diameters from the same manufacturer Purpose: Compare the resistance to helical bending deformation of two types of steel wire with different diameters under the same test conditions.

[0042] Materials to be tested: The diameters of the four steel wires are respectively d 1 = 0.25mm d 2 = 0.28 mm.

[0043] Method execution: Select the diameter of pre-deformer 2 Φ =3.0mm, weight 3 m =1000g, pulling speed v =150mm / min. This condition is designed to produce moderate curl, facilitating observation and measurement.

[0044] Test execution: The two groups of steel wires were tested according to the procedure, with each group tested three times. The coil diameter was recorded. D and pitch P The average value.

[0045] Data Results: Steel wire diameter (mm) Pitch (mm) Pitch (mm) 0.25 3.132±0.212 14.253±0.265 0.28 3.918±0.273 15.135±0.196 Analysis and Conclusion: Under the same test conditions, the diameter of the loop formed by steel wire 4 with a diameter of 0.28 mm is... D and pitch P All are significantly larger than 0.25 mm in diameter. Among them, the coil diameter... D Increase by approximately 0.9mm, pitch P The increase is approximately 0.8mm.

[0046] This result indicates that as the diameter of the steel wire increases, its moment of inertia increases, its resistance to bending deformation is enhanced, and its elastic recovery under the same external force is more significant, thus forming a more "open" coil shape (i.e., a larger coil diameter). D and pitch P ).

[0047] Example 2: Comparison of the resistance to spiral bending deformation of steel wire 4 from different manufacturers of the same specification (0.25mm) Purpose: The resistance to helical bending deformation of steel wire of the same specification from two manufacturers was compared under the same test conditions to verify the ability of this method to distinguish subtle stiffness differences.

[0048] Materials to be tested: diameter d The 0.25mm thick hose wire 4 was taken from manufacturers A and B respectively.

[0049] Method execution: Select the diameter of pre-deformer 2 Φ =3.0mm, weight 3 m =1000g, pulling speed v =150mm / min. This condition is designed to produce moderate curl, facilitating observation and measurement.

[0050] Test execution: The two groups of steel wires were tested according to the procedure, with each group tested three times. The coil diameter was recorded. D and pitch P The average value.

[0051] Data Results: Manufacturer Pitch (mm) Pitch (mm) A 3.741±0.179 15.015±0.284 B 3.132±0.212 14.253±0.265 Analysis and Conclusion: Under identical test conditions, the coiling geometry parameters of the two sets of steel wires 4 were extremely similar. Manufacturer A's coil diameter... D Slightly larger than Manufacturer B (difference approximately 0.6mm), pitch P The difference is also slightly larger (approximately 0.8 mm), indicating that under the same bending-tensile combined stress, it has a slightly stronger tendency for elastic recovery and slightly higher stiffness.

[0052] In terms of resistance to helical bending deformation, manufacturer A is slightly better than manufacturer B. This method successfully quantifies the subtle differences between the two into comparable geometric parameters, verifying its sensitivity to minute material fluctuations.

[0053] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A device for detecting the bending deformation capacity of a steel wire spiral, characterized in that: The device includes a vertically arranged panel (1), a pre-deformer (2) and multiple guide wheels connected to the panel (1). The pre-deformer (2) is replaceable. One end of the monofilament to be tested is connected to a weight (3). The weight (3) hangs down naturally under gravity. The free end of the monofilament to be tested passes through each guide wheel and the pre-deformer (2) and is pulled by hand or traction device to make the monofilament to be tested form a spiral.

2. The device for detecting the bending deformation capacity of a steel wire spiral as described in claim 1, characterized in that: The plurality of guide wheels include a large-diameter first guide wheel (5) installed on the lower left of the panel (1), a small-diameter second guide wheel (6) installed on the middle left side, a small-diameter third guide wheel (7) installed on the top of the panel (1), and a large-diameter fourth guide wheel (8) installed on the lower right of the panel (1).

3. The device for detecting the bending deformation capacity of a steel wire spiral as described in claim 1, characterized in that: The bottom of the panel (1) is connected to a column (9), and the bottom end of the column (9) is connected to a base (10). A stepped hole is provided at the center of the panel (1), and one end of the pre-deformer (2) is inserted into the stepped hole.

4. The device for detecting the bending deformation capacity of a steel wire spiral as described in claim 3, characterized in that: The pre-deformer (2) can provide a variety of diameter specifications to adjust the bending curvature of the monofilament to meet the testing requirements of monofilaments with different stiffness.

5. A method for detecting the bending deformation capacity of a steel wire spiral, using the detection device for the bending deformation capacity of a steel wire spiral as described in claim 2, characterized in that, Includes the following steps: Cut a section of the steel wire to be tested (4), select a pre-deformer (2) of the required diameter and install and fix it, and prepare a weight of the specified weight (3). Securely connect one end of the steel wire (4) to the weight (3), and then thread the steel wire (4) around it in sequence: From bottom to top, around the first guide wheel (5) at the lower left of panel (1); To the upper right, around the second guide wheel (6) in the middle of the left side; Horizontally to the right, or around the third guide wheel (7) at the top of panel (1) to the lower right. Horizontally through the pre-deformer (2); After passing through the pre-deformer (2), it goes to the lower right and goes around the fourth guide wheel (8) at the lower right. At this time, the weight (3) is suspended on one side of the device, and the free end of the steel wire (4) to be tested is led out from the fourth guide wheel (8) and pulled by the operator using his hand or a traction device; The operator uses his hand or a puller to pull the free end of the steel wire (4) to be tested, and pulls it horizontally at a slow and uniform speed. As the steel wire (4) to be tested is pulled out, the weight (3) is lifted, and its gravity is converted into the tensile force of the steel wire (4) to be tested through the guide wheel system. When the steel wire (4) passes through the pre-deformer (2), it bends and deforms, and is straightened after its exit. Due to the elastic recovery effect of the material, a stable spiral is formed in the section between the pre-deformer (2) and the fourth guide wheel (8). Once the helical segment has formed and stabilized, stop pulling or maintain slow pulling to preserve the helical shape. The operator can then: Observe the uniformity and morphology of the spiral directly; Use vernier calipers to measure the diameter of the spiral section. D and pitch P ; By quantitatively comparing the characteristic parameters D and P values ​​measured by different steel wire (4) samples, the ability of each steel wire (4) to resist helical bending deformation can be comprehensively evaluated.

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