Identifying method for tissue abnormity after medium-frequency heat diffusion, sampling auxiliary device and sampling method
By using the skin effect of copper tubes and high-frequency alternating magnetic fields at the front end of the medium-frequency heat diffusion equipment, the strength loss of steel wire is quantitatively detected, solving the problem of inaccurate detection in existing technologies. This achieves efficient and accurate identification of tissue abnormalities, improving production efficiency and product quality.
Patent Information
- Application Number
- CN202511563678.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-03-20
AI Technical Summary
In existing technologies, the method of identifying the medium-frequency thermal diffusion state by detecting the copper content on the surface of alloy steel wire is inaccurate, affecting production adjustments. Furthermore, it is difficult to identify the microstructure of steel wires of different strengths, leading to abnormal work hardening or insufficient breaking tensile strength.
A sampling auxiliary device and method for identifying structural anomalies after medium-frequency thermal diffusion is adopted. The medium-frequency thermal diffusion device is pushed into the outside of the steel wire using a copper tube. Combined with the skin effect of the high-frequency alternating magnetic field, the strength loss of the steel wire is quantitatively detected, avoiding line stoppage.
It enables efficient detection during high-speed operation of steel wire, accurately identifies whether the heat diffusion temperature is too high or too low, reduces the impact on production, and improves the accuracy of detection results and production efficiency.
Smart Images
Figure CN121702784A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of steel cord production technology, specifically to a method for identifying structural anomalies after medium-frequency thermal diffusion, a sampling auxiliary device, and a sampling method. Background Technology
[0002] In the production of steel cord, to ensure sufficient adhesion between the finished product and the rubber, brass needs to be electroplated onto the surface of the alloy steel wire in the semi-finished product process. The brass requires copper plating, zinc plating, and finally, medium-frequency thermal diffusion to allow the copper and zinc to diffuse. If the medium-frequency thermal diffusion temperature is too high, it can easily lead to spheroidization of the pearlite lamellars in the steel wire, reducing work hardening during subsequent drawing, and consequently resulting in insufficient breaking strength of the finished cord. Conversely, if the thermal diffusion temperature is too low, it will lead to insufficient copper-zinc diffusion, resulting in insufficient copper content on the surface of the alloy steel wire, producing β-term brass that is unfavorable for drawing. Currently, the industry often uses the detection of the surface copper content of the alloy steel wire (copper content per 1g / kg thickness of the alloy coating) to identify whether the diffusion state is appropriate.
[0003] Using the detection of copper content on the surface of alloy steel wire to identify the suitability of diffusion has the following problems: 1. Inaccurate surface copper content detection: Because surface copper content detection requires partial stripping, the stripping process relies on personnel to judge the appropriate stripping weight by observing the degree of blue turning of the stripping solution, the number of shakes, and the time. Therefore, surface copper content detection is more difficult than full stripping detection and is more susceptible to human error, resulting in higher inaccuracies. Inaccurate surface copper content detection can lead to loss of control in on-site adjustments, which in turn can reduce work hardening or produce β brass, increasing the difficulty of subsequent drawing. 2. Alloy steel wires of different strengths have different sheet thicknesses, resulting in different impact resistance after thermal diffusion. It is difficult to judge the microstructure of alloy steel wires of different strengths based solely on the surface copper content. For example, controlling the surface copper content of steel wires with a strength higher than 1320 MPa may lead to spheroidization of the microstructure, which in turn leads to abnormal work hardening. 3. Different heat treatment process settings (furnace temperature, immersion length in quenching tank) will result in different impact resistance of the microstructure under the same alloy strength. For example, when using non-isothermal quenching conditions to control the surface copper by more than 60%, compared with isothermal quenching, there is a risk of reduced work hardening, which leads to a decrease in breaking tensile strength. Summary of the Invention
[0004] To address the aforementioned technical problems, this technical solution provides a method for identifying structural anomalies after medium-frequency thermal diffusion, a sampling auxiliary device, and a sampling method. This method allows for sampling and detection of strength loss due to medium-frequency thermal diffusion of steel wires whenever testing is required, even when the wire is running at high speed. It eliminates the need for line stoppages and avoids the efficiency impact of low speeds, while ensuring effective test results. This effectively solves the aforementioned problems.
[0005] The application is realized by the following technical solutions: A sampling auxiliary device for identifying tissue abnormalities after medium-frequency heat diffusion, comprising an MF front wire separation comb arranged at the front end of a medium-frequency heat diffusion device, and a steel wire entering the medium-frequency heat diffusion device through the through holes on the MF front wire separation comb; a copper pipe is arranged in the through holes on the MF front wire separation comb and is sleeved on the outside of the steel wire and can be pushed into the medium-frequency heat diffusion device according to requirements to heat insulate the steel wire.
[0006] Further, a plurality of fixed clamping blocks are arranged on the top of the MF front wire separation comb, and the fixed clamping blocks are arranged at positions corresponding to the positions of the through holes provided with the copper pipes; a sliding rail parallel to the steel wire is fixed on the fixed clamping block, a sliding block movable along the sliding rail is arranged on the sliding rail, and the bottom of the sliding block is connected with one end of the copper pipe away from the medium-frequency heat diffusion device; when the sliding block is moved, the copper pipe can be pushed into the medium-frequency heat diffusion device or pulled out of the medium-frequency heat diffusion device.
[0007] Further, the other end of the sliding rail is arranged on a horizontal support, and the horizontal support is parallel to the MF front wire separation comb.
[0008] Further, a plurality of grooves are arranged on the horizontal support, and the positions of the grooves correspond to the positions of the through holes on the MF front wire separation comb.
[0009] Further, longitudinal support columns are fixed at the two ends of the horizontal support, and a connecting block is arranged at the bottom of the support column; the connecting block is fixedly connected with the ground or a connecting device through a fixing member.
[0010] A sampling method for identifying tissue abnormalities after medium-frequency heat diffusion, characterized in that: the sampling method is used in cooperation with the above-mentioned sampling method for identifying tissue abnormalities after medium-frequency heat diffusion; the operation steps of the sampling method comprise: Step 1: determining the sampling position according to the installation position of the copper pipe; Step 2: cutting the steel wire, leaving 2 turns of sample, and marking as “copper pipe pulled out”; Step 3: then immediately pushing the copper pipe into the front end of the medium-frequency heat diffusion device, pushing the copper pipe to the bottom, and inserting the copper pipe into the medium-frequency heat diffusion pipe; Step 4: continuously winding the steel wire in the hand or on the waste wire disc; Step 5: estimating the time according to the distance / speed of the production line, confirming that the steel wire produced after the copper pipe is inserted runs to the winding, cutting the steel wire, leaving 2 turns of sample, and marking as “copper pipe pushed in”; Step 6: after the sampling is completed, pulling out the copper pipe to the specified marking line position / limit position at the front end of the medium-frequency heat diffusion device and tightening the locking nut, and after the normal steel wire reaches the winding, cutting the steel wire and winding it into the I-shaped wheel to restore normal production.
[0011] Further, the push-in copper pipe in step 3, if the copper pipe is not pushed in, the nut at both ends of the slide bar can be loosened, the position of the slide bar is adjusted, and then the slide block is pushed, and brute force operation should be avoided.
[0012] Further, in the wire collecting steps described in steps 2 and 5, it is necessary to ensure that two sections of steel wire are collected: one section is the normal steel wire when the copper pipe is not inserted; and one section is the steel wire after the copper pipe is inserted.
[0013] Further, after the copper pipe is pulled out in step 6, the limiting and fixing are performed, and it is necessary to ensure that the copper pipe and the steel wire do not rub during normal production.
[0014] A method for identifying abnormal organization after medium frequency thermal diffusion, three positions for strength loss detection are arranged on an alloy production line, which are a, b and c, respectively, three samples are taken at each position after medium frequency thermal diffusion and shielding medium frequency thermal diffusion for strength detection, and the sampling method is the above-mentioned sampling method for identifying abnormal organization after medium frequency thermal diffusion; wherein the sampling of the a position is marked as a1, a2, a3, a1 shielding, a2 shielding and a3 shielding, and the strength loss of the a position before and after thermal diffusion is: a gap=sum (a1 shielding, a2 shielding, a3 shielding)-sum (a1, a2, a3); The strength loss of the b position and the c position before and after thermal diffusion is calculated in the same way, and is recorded as bgap and c gap, respectively; and the strength loss of the production line after thermal diffusion is: average (a gap + b gap + c gap). Advantages
[0015] The method for identifying abnormal organization after medium frequency thermal diffusion, the sampling auxiliary device and the sampling method provided by the present application have the following advantages compared with the prior art: The sampling auxiliary device in the technical solution can be installed on the existing machine without large-scale modification of the alloy equipment, and has high adaptability. The identification method and the sampling method can directly sample and detect the strength loss of the steel wire after medium frequency thermal diffusion when the steel wire is running at high speed without stopping the line and affecting the efficiency, and the detection result is effective.
[0016] The technical solution can directly detect the strength difference of the alloy steel wire before and after medium frequency thermal diffusion, and quantitatively identify whether the temperature of the thermal diffusion is too high to produce spheroidization of the organization by the strength difference; the skin effect under the high-frequency alternating magnetic field is applied in the identification method, so that the alternating induced current can only heat the copper pipe and cannot heat the steel wire in the copper pipe, thereby realizing the detection of the strength of the steel wire without medium frequency thermal diffusion during the operation of the production line.
[0017] The technical solution quantitatively measures the strength loss of the alloy steel wire before and after passing through the copper pipe through the medium frequency heat diffusion, which is significantly improved compared to the effectiveness of determining the spheroidization state of the wire organization only by the gradient. By determining whether the strength loss exceeds 10 MPa / 15 MPa, it can be determined whether the heating temperature of the wire is too high to affect the organization performance. If the strength loss is excessive, it is determined that the medium frequency heat diffusion voltage needs to be reduced to ensure the organization state of the wire. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a physical photo of the alloy device in the prior art.
[0019] Figure 2 It is a schematic diagram of the overall structure of the sampling auxiliary device in Example 1.
[0020] Figure 3 It is a schematic diagram of the structure of the horizontal support in Example 1.
[0021] Figure 4 It is a schematic diagram of the skin effect principle of the wire after the copper pipe is pushed in Example 1.
[0022] Figure 5 It is a schematic diagram of the operation process of Example 2.
[0023] The marks in the drawings are: 1-medium frequency heat diffusion device, 2-MF front wire comb, 3-copper pipe, 4-fixed clamp block, 5-tightening nut and screw, 6-sliding rail, 7-sliding block, 8-horizontal support, 81-groove, 9-support, 10-connection block. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. The described embodiments are only some of the embodiments of the present application, not all. Without departing from the design concept of the present application, various modifications and improvements of the technical solutions of the present application made by those skilled in the art shall fall within the protection scope of the present application. Example 1
[0025] As shown in Figure 1 A sampling auxiliary device for identifying abnormal organization after medium frequency heat diffusion, comprising a MF front wire comb 2 arranged at the front end of a medium frequency heat diffusion device 1.
[0026] As shown in Figure 2As shown, a plurality of through holes in the set position on the MF front branch comb 2 are provided with copper pipes 3 arranged along the steel wire direction (4 are provided in this embodiment, and any integer greater than 1 can also be used), and the steel wire enters the MF heat diffusion device 1 after passing through the through hole or copper pipe 3 on the MF front branch comb 2. The copper pipe 3 is sleeved on the outside of the steel wire and can be pushed into the MF heat diffusion device 1 according to the needs to heat insulate the steel wire.
[0027] A plurality of fixed clamping blocks 4 are installed on the top of the MF front branch comb 2, i.e. the upper side where the copper pipe 3 needs to be installed. The fixed clamping block 4 is movably fixedly installed on the top of the MF front branch comb 2 on the upper side of the copper pipe 3 through a fastening nut and a screw rod 5. The mode of movable fixed installation of the fixed clamping block 4 allows the position of the copper pipe 3 to be adjusted according to the needs. If the position of the copper pipe 3 needs to be adjusted, it can only be adjusted when the batch of steel cord is replaced or when the steel cord is rethreaded.
[0028] A slide rail 6 parallel to the steel cord is fixed on the top of the fixed clamping block 4, and a sliding block 7 movable along the slide rail 6 is installed on the slide rail 6. The bottom of the sliding block 7 is connected to one end of the copper pipe 3 away from the MF heat diffusion device 1. When the sliding block 7 is pushed by hand, the copper pipe 3 can be pushed into the MF heat diffusion device 1 or pulled out of the MF heat diffusion device 1.
[0029] The other end of the slide rail 6 is installed on a horizontal support 8 parallel to the MF front branch comb 2. A plurality of grooves 81 are provided on the horizontal support 8, and the positions of the plurality of grooves 81 correspond to the positions of the through holes on the MF front branch comb 2. Figure 3 As shown, the two ends of the horizontal support 8 are fixed with longitudinally arranged support columns 9, and the bottom of the support column 9 is provided with a connecting block 10. The connecting block 10 is fixedly connected with the ground or a connecting device through a fixing member.
[0030] When the sampling auxiliary device is pushed into the MF heat diffusion pipe, the spheroidization temperature of the steel cord is about 600℃, which is compared with the normal steel wire passing through the MF heat diffusion. The device applies the skin effect under the high-frequency alternating magnetic field, so that the alternating induced current can only heat the copper pipe 3, but cannot heat the steel wire in the copper pipe 3, thereby realizing the detection of the strength of the steel wire not passing through the MF heat diffusion during the production line operation.
[0031] After the copper pipe 3 is pushed into the MF heat diffusion pipe, the skin effect principle of the steel wire is as shown in Figure 4 The alternating current generates an alternating magnetic field, which induces an eddy current. According to Faraday's law of electromagnetic induction, this changing magnetic field will induce an induced electromotive force in the conductor. This induced electromotive force will drive the eddy current in the conductor to form a vortex, which is simply called "eddy current". The interaction between the eddy current and the main current in the center region of the conductor is opposite to the direction of the original main current. This causes the actual current in the center region to be greatly weakened.
[0032] In the conductor surface area, the induced eddy current direction is the same as the original main current direction. This results in the actual current of the surface area being enhanced. The copper tube inserted after the device is damaged will be preferentially heated due to the skin effect, and the steel wire inside the copper tube will hardly be heated.
[0033] The copper tube can shield about one heating coil length, resulting in an average temperature reduction of about 135°C for the shielded steel wire. Due to the strength loss, it is expected to reach 600°C, so the temperature of the shielded steel wire cannot reach this temperature, which can be regarded as a steel wire that has not undergone medium-frequency heat diffusion. Example 2
[0034] A sampling method for identifying tissue abnormalities after medium-frequency heat diffusion, which needs to be used in conjunction with the sampling auxiliary device for identifying tissue abnormalities after medium-frequency heat diffusion described in Example 1; the operation steps of the sampling method are as shown in Figure 5 The steps include: Step 1: Determine the sampling position according to the installation position of the copper tube; Step 2: Cut the steel wire and leave 2 turns of sample, marked as "copper tube pulled out"; Step 3: Then immediately push the copper tube into the front end of the medium-frequency heat diffusion equipment, push the copper tube to the bottom, and insert the copper tube into the medium-frequency heat diffusion tube; if the copper tube is not easy to push in, loosen the nuts at both ends of the slide rod, adjust the position of the slide rod, and then push the slide block again. Avoid brute force operation.
[0035] Step 4: Continue to collect the steel wire in your hand or on the waste wire disc; Step 5: Estimate the time according to the production line distance / speed, confirm that the copper tube is inserted, and the steel wire produced is running to the take-up, cut the steel wire, leave 2 turns of sample, and mark it as "copper tube pushed in"; In the step of taking up, it is necessary to ensure that the take-up collects two sections of steel wire: one section is the normal steel wire when the copper tube is not inserted; and the other section is the steel wire after the copper tube is inserted.
[0036] Step 6: After the sampling is completed, pull out the copper tube to the specified marked line position / limit position at the front end of the medium-frequency heat diffusion equipment and tighten the locking nut, wait for the normal steel wire to reach the take-up, cut the steel wire and wind it into the spool to resume normal production; when the copper tube is pulled out and fixed in position, it is necessary to ensure that the copper tube and the steel wire do not produce sound friction during normal production. Example 3
[0037] A method for identifying tissue abnormalities after medium-frequency thermal diffusion, three positions are set on the alloy production line for strength loss detection, which are a, b and c. Each position takes three samples for strength detection after medium-frequency thermal diffusion and shielding medium-frequency thermal diffusion, respectively. The sampling method adopts the above-mentioned sampling method for identifying tissue abnormalities after medium-frequency thermal diffusion. Wherein, the sampling of a position is marked as a1, a2, a3, a1 shielding, a2 shielding and a3 shielding. The strength loss of a position before and after thermal diffusion is: a gap=sum(a1 shielding, a2 shielding, a3 shielding)-sum(a1, a2, a3); The strength loss of b position and c position before and after thermal diffusion is calculated in the same way, which is bgap and c gap respectively. The strength loss of the production line after thermal diffusion is: average(a gap+b gap+c gap).
Claims
1. A sampling auxiliary device for identifying tissue abnormalities after intermediate frequency thermal diffusion, comprising an MF front splitter comb (2) disposed at the front end of an intermediate frequency thermal diffusion device (1), wherein a steel wire passes through a through hole on the MF front splitter comb (2) and enters the intermediate frequency thermal diffusion device (1); characterized in that: The MF front splitter comb (2) has multiple through holes with copper tubes (3) arranged along the direction of the steel wire. The copper tubes (3) are sleeved on the outside of the steel wire and can be pushed into the medium frequency heat diffusion device (1) as needed to insulate the steel wire.
2. The sampling auxiliary device for identifying tissue abnormalities after mid-frequency thermal diffusion according to claim 1, characterized in that: The top of the MF front splitter comb (2) is equipped with multiple fixing blocks (4), and the installation position of the fixing blocks (4) corresponds to the position of the through hole of the copper tube (3); a slide rail (6) parallel to the steel wire is fixed on the fixing blocks (4), and a slider (7) that can move along the slide rail (6) is installed on the slide rail (6). The bottom of the slider (7) is connected to the end of the copper tube (3) away from the intermediate frequency heat diffusion device (1); when the slider (7) is moved, the copper tube (3) can be pushed into the intermediate frequency heat diffusion device (1) or pulled out from the intermediate frequency heat diffusion device (1).
3. A sampling auxiliary device for identifying tissue abnormalities after mid-frequency thermal diffusion according to claim 2, characterized in that: The other end of the slide rail (6) is mounted on a horizontal bracket (8), which is parallel to the MF front comb (2).
4. A sampling auxiliary device for identifying tissue abnormalities after mid-frequency thermal diffusion according to claim 3, characterized in that: The horizontal support (8) is provided with multiple grooves (81), and the positions of the multiple grooves (81) correspond to the positions of the through holes on the MF front comb (2).
5. A sampling auxiliary device for identifying tissue abnormalities after mid-frequency thermal diffusion according to claim 3, characterized in that: The horizontal support (8) is fixed with longitudinally arranged pillars (9) at both ends, and a connecting block (10) is provided at the bottom of the pillar (9); the connecting block (10) is fixedly connected to the ground or connecting device through a fastener.
6. A sampling method for identifying tissue abnormalities after mid-frequency thermal diffusion, characterized in that: This method requires the use of a sampling method for identifying tissue abnormalities after mid-frequency thermal diffusion, as described in claims 1 to 5; the sampling method includes the following steps: Step 1: Determine the sampling location based on the installation position of the copper tube (3); Step 2: Trim the wire, leaving two loops as a sample, and mark it as "copper tube pulled out"; Step 3: Then immediately push the copper tube (3) into the front end of the intermediate frequency heat diffusion device (1), push the copper tube (3) all the way to the bottom, and insert the copper tube (3) completely into the intermediate frequency heat diffusion tube; Step 4: Continue to hold the wire in your hand or wind it onto the waste wire spool; Step 5: Estimate the time based on the production line distance / speed, confirm that the steel wire produced after the copper tube (3) is inserted has reached the take-up point, cut the steel wire, leave a sample of 2 turns, and record it as "copper tube pushed in"; Step 6: After sampling, pull the copper tube (3) to the front end of the medium frequency heat diffusion equipment (1) to the designated mark line position / limit position and tighten the locking nut. After the normal steel wire arrives at the take-up position, cut the steel wire and wind it into the I-beam to resume normal production.
7. A sampling method for identifying tissue abnormalities after mid-frequency thermal diffusion according to claim 6, characterized in that: If the copper tube (3) is difficult to push in as described in step 3, the nuts at both ends of the slide rail (6) can be loosened, the position of the slide rail (6) can be adjusted, and then the slider (7) can be pushed. Avoid brute force.
8. A sampling method for identifying tissue abnormalities after mid-frequency thermal diffusion according to claim 6, characterized in that: In the wire take-up steps described in steps 2 and 5, it is necessary to ensure that two sections of steel wire are collected: one section is the normal steel wire before the copper tube (3) is inserted; and the other section is the steel wire after the copper tube (3) is inserted.
9. A sampling method for identifying tissue abnormalities after mid-frequency thermal diffusion according to claim 6, characterized in that: When the copper tube (3) described in step 6 is pulled out and then fixed in place, it is necessary to ensure that the copper tube (3) does not make noise or rub against the steel wire during normal production.
10. A method for identifying tissue abnormalities after mid-frequency thermal diffusion, characterized in that: Three locations, a, b, and c, are set up on the alloy production line for strength loss detection. Three samples are taken from each location after both medium-frequency thermal diffusion and shielded medium-frequency thermal diffusion for strength testing. The sampling method described in claims 6 to 9 for identifying microstructural anomalies after medium-frequency thermal diffusion is used. The samples from location a are labeled a1, a2, a3, a1 shielded, a2 shielded, and a3 shielded. The strength loss at location a before and after thermal diffusion is: a gap = sum(a1 shielded, a2 shielded, a3 shielded) - sum(a1, a2, a3). The strength losses at locations b and c before and after thermal diffusion are calculated in the same way and denoted as b gap and c gap, respectively. The strength loss of the entire production line after thermal diffusion is: average(a gap + b gap + c gap).