Torsion guide structure for rolled piece

Abstract

The invention discloses a torsion guide structure for a rolled piece, and relates to the technical field of metallurgical steel rolling, the guide structure comprises guide roller assemblies arranged in pairs and an outlet guide used between finish rolling continuous flat racks, and the guide structure can utilize an asymmetric clamping area to pass through diagonal distribution of a plane working face and a semi-R arc-shaped working face; the semi-R arc-shaped working face is attached to the curved surface of one side of the rolled piece to form linear contact, the plane working face is in point contact with the other side of the rolled piece, and the height difference between the plane working face and the plane working face is matched to form a stable triangular constraint structure. According to the structure, the central axis of a rolled piece is always kept unchanged in the torsion process, the contact area is increased by 40%-50% compared with that of a flat roller, clamping force is distributed in a gradient mode in the circumferential direction of the section of the rolled piece, rigid extrusion of a symmetrical structure is avoided, tiny deformation of the rolled piece is absorbed through flexible contact of a plane working face, dynamic self-adaptive clamping is achieved, and the service life of the rolled piece is prolonged. And the torsion angle deviation is controlled within + / -2 degrees.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical rolling, in particular to a torsion guide structure for rolled pieces. BACKGROUND

[0002] In the metallurgical rolling production, the finishing rolling process is a key link for determining the final size and quality of the product, and has a high requirement for the transmission stability and posture control of the rolled piece. Especially for the bar production line with continuous flat stands, the rolled piece needs to complete the torsion of a predetermined angle in the multi-pass rolling process to meet the cross-sectional shape requirement of subsequent rolling. For example, in the bar finishing rolling process, K1-K4 stands are designed as flat rolls, and the rolled piece in the K2 pass needs to be twisted by 90 degrees after passing through the outlet guide and then accurately enter the K1 finished product stand. This torsion process directly affects the dimensional accuracy and surface quality of the finished product. In this process, the guide roll structure of the outlet guide is the core component for torsion guidance, and its design rationality determines whether the rolled piece can maintain a stable posture during high-speed transmission and avoid deviation, jamming or surface damage.

[0003] In the prior art, the outlet guide of the finishing rolling flat stand is usually designed with symmetrical flat rolls or double-R arc rolls. The symmetrical flat rolls hold the rolled piece through linear contact, and the contact area is only 15%-20% of the cross-sectional circumference of the rolled piece. When transmitting at high speed, the rolled piece is prone to bounce due to uneven clamping force, which may cause torsion angle deviation and even lead to a run-out accident. Although the double-R arc roll increases the contact area, the two arc-shaped working surfaces have the same curvature, forming a symmetrical clamping area. During the torsion process, the rolled piece is prone to rigid extrusion with the arc-shaped edge, which may cause periodic indentation on the surface. In addition, the symmetrical structure cannot adapt to the dynamic deformation of the rolled piece during torsion. When there is a slight deviation in the cross-section of the rolled piece, the problem of excessive contact on one side and excessive gap on the other side may occur, which may aggravate the wear of the guide roll and the surface defects of the rolled piece.

[0004] In summary, the existing guide roll structure has obvious deficiencies in clamping stability and torsion accuracy, and it is difficult to meet the needs of high-precision rolling production. In particular, in the production of deformed steel bars, defects such as folding of the cutting strip and surface indentation caused by improper torsion not only reduce the product yield but also increase the frequency of shutdown and adjustment, which seriously restricts the improvement of production efficiency. Therefore, it is an important direction for the improvement of rolling equipment to develop a guide roll structure that can achieve stable clamping, precise torsion guidance and avoid surface damage. SUMMARY

[0005] The purpose of the present application is to make up for the deficiencies of the prior art, and provide a torsion guide structure for a rolled piece, which can form a three-point positioning and clamping mode by diagonally distributing a plane working surface and a semi-R arc-shaped working surface through an asymmetric clamping area, the semi-R arc-shaped working surface is attached to a curved surface of one side of the rolled piece to form a line contact, the plane working surface forms a point contact with the other side of the rolled piece, and the height difference between the two forms a stable triangular constraint structure. This structure keeps the center axis of the rolled piece unchanged during the torsion process, increases the contact area by 40%-50% compared with a flat roller, and the clamping force is distributed in a gradient along the cross section of the rolled piece, which avoids rigid extrusion of the symmetric structure and absorbs the small deformation of the rolled piece through the flexible contact of the plane working surface to realize dynamic self-adaptive clamping and ensure that the torsion angle deviation is controlled within ±2°.

[0006] The present application provides the following technical solutions to solve the above technical problems: a torsion guide structure for a rolled piece, the guide structure comprising a pair of guide roller assemblies arranged in pairs for outlet guide between the exit of the finishing continuous flat rack, the guide roller assembly is composed of a first roller body and a second roller body;

[0007] The first roller body has a plane working surface;

[0008] The second roller body has a semi-R arc-shaped working surface, the curvature radius R of the semi-R arc-shaped working surface and the cross-sectional equivalent diameter D of the rolled piece satisfy: 0.4D≤R≤0.6D;

[0009] The plane working surface and the semi-R arc-shaped working surface are diagonally distributed to form an asymmetric clamping area.

[0010] Further, the guide roller assembly further comprises a roller shaft and a bearing seat, the first roller body and the second roller body are respectively rotatably mounted in the bearing seat through the roller shaft, and the axes of the two roller bodies are arranged in parallel, the axis spacing L and the cross-sectional equivalent diameter D of the rolled piece satisfy: 1.05D≤L≤1.15D.

[0011] Further, the bearing seat is provided with an adjusting mechanism, the adjusting mechanism comprises a sliding guide rail arranged in the vertical direction of the roller body axis, a lead screw assembly for driving the roller shaft to move along the guide rail, and a locking nut for locking the position, by adjusting the spacing between the two roller bodies, the rolled piece with a diameter deviation within ±5% can be adapted, and the stable wrapping of the asymmetric clamping area on the rolled piece is ensured, while the surface extrusion deformation of the rolled piece caused by too small spacing or clamping failure caused by too large spacing is avoided.

[0012] Further, the arc center angle α of the semi-R arc-shaped working surface is 100°-120°, and the arc length L and the nominal diameter D of the rolled piece satisfy the relationship: wherein, is the curvature radius, is the arc length compensation amount and ;

[0013] The two ends of the semi-R arc-shaped working surface are respectively provided with a chamfer transition area, the chamfer angle is 30°-45°, and the chamfer width is 3- .

[0014] Further, the edge of the plane working surface is provided with a micro-round angle with a radius of 1-2mm, and the surface roughness Ra of the plane working surface is ≤0.8μm.

[0015] The axial length of the first roller body and the second roller body is greater than the width of the rolled piece by 10-15mm, which prevents the lateral deviation of the rolled piece, and the two ends of the arc-shaped working surface are provided with a transition round angle with a radius r of 5-8mm.

[0016] Further, the guide roller assembly further comprises an exit guide plate used in cooperation with the first roller body and the second roller body, the exit guide plate is arranged on the feeding side of the guide roller assembly, the axis of the guide channel of the exit guide plate is collinear with the central axis of the asymmetric clamping area, the inlet end of the guide channel is provided with a flared structure, the flared angle β is 30°-45°, the flared segment length is 100-150mm, the inner wall of the guide channel is provided with a wear-resistant coating with a thickness of 0.3-0.5mm, so as to enhance the wear resistance of the guide plate, reduce the impact and deviation of the rolled piece before entering the guide roller assembly, ensure that the rolled piece enters the asymmetric clamping area along the predetermined track, and reduce the lateral impact force on the guide roller.

[0017] Further, the curvature radius R of the semi-R arc-shaped working surface is gradually changed along the roller axis direction, the curvature radius R1 near the feeding end and the curvature radius R2 near the discharging end satisfy: R1=1.1R, R2=0.9R, and the transition between R1 and R2 is through a smooth curve, and the transition segment length is 0.5L1, L1 being the roller body length. This gradually changing curvature design can adapt to the cross-section posture change of the rolled piece during the twisting process, the larger curvature radius at the feeding end can reduce the resistance when the rolled piece initially enters, and the smaller curvature radius at the discharging end can enhance the final positioning effect on the rolled piece, so as to ensure that the rolled piece enters the next rack in a vertical posture and reduce the biting fault caused by the posture deviation.

[0018] Further, the inlet end of the asymmetric clamping area is provided with a guide conical surface, the conical angle γ of the guide conical surface is 60°-75°, the conical surface length is 80-120mm, and the conical surface is smoothly transitioned with the working surface of the first roller body and the second roller body, the transition round angle radius is 10-15mm, and the surface of the guide conical surface is provided with wear-resistant lines, the lines are diagonal lines with an angle of 45° to the roller axis, the line depth is 0.5-1mm, and the line spacing is 5-8mm, which can not only enhance the initial guiding effect on the rolled piece, but also absorb the impact force when the rolled piece enters through the micro-deformation of the lines, reduce the rigid collision between the rolled piece and the roller, and at the same time, the diagonal line structure can assist the rolled piece to form a pre-twisting trend at the initial twisting stage, thereby improving the twisting efficiency.

[0019] Further, a sensor assembly for detecting the position of the rolled piece is also included, the sensor assembly includes a first laser displacement sensor arranged at the entrance of the asymmetric clamping area and a second laser displacement sensor arranged at the exit, the first laser displacement sensor is used to detect the cross-sectional size and center position before the rolled piece enters, and the second laser displacement sensor is used to detect the twist angle and surface quality after the rolled piece leaves, the detection accuracy of the sensor is ±0.01mm, the sampling frequency is 1000Hz, and the detection data is transmitted to the control system in real time, the control system dynamically adjusts the distance and rotating speed of the two roller bodies according to the detection result through the adjusting mechanism, when the twist angle deviation of the rolled piece is detected to be more than ±5° or the surface has a defect with a depth of ≥0.1mm, the control system automatically sends an alarm signal and stops to ensure the stable product quality.

[0020] Further, the guide roller assembly is used for the exit guide of the K2 to K1 rack in the continuous flat rack, the rolled piece in the K2 pass is an elliptical cross section, and the K1 pass is a finished product rack.

[0021] The asymmetric clamping area of the guide roller assembly is used for twisting the elliptical rolled piece in the K2 pass by 90 degrees and then guiding it into the K1 rack.

[0022] Compared with the prior art, the twist guide structure for the rolled piece has the following beneficial effects:

[0023] Firstly, the present application utilizes the diagonal distribution of the plane working surface and the semi-R arc-shaped working surface in the asymmetric clamping area to form a three-point positioning and clamping mode, the semi-R arc-shaped working surface is attached to one side of the curved surface of the rolled piece to form line contact, the plane working surface forms point contact with the other side of the rolled piece, and the height difference between the two constitutes a stable triangular constraint structure. This structure makes the center axis of the rolled piece remain unchanged during the twisting process, the contact area is increased by 40%-50% compared with the flat roller, and the clamping force is distributed in a gradient along the circumference of the cross section of the rolled piece, which not only avoids rigid extrusion of the symmetric structure, but also absorbs the slight deformation of the rolled piece through the flexible contact of the plane working surface to realize dynamic self-adaptive clamping and ensure that the twist angle deviation is controlled within ±2°.

[0024] Secondly, the semi-R arc-shaped working surface of the present application forms an incomplete wrapping relationship with the cross section of the rolled piece, and the arc-shaped part covers 1 / 3-1 / 2 of the cross section of the rolled piece, which not only provides sufficient friction force to drive the twisting, but also reserves a gap of 0.2D-0.3D for the slight displacement of the rolled piece during the twisting. This design utilizes the elastic deformation of the rolled piece itself to compensate for the cross-sectional deviation, and when the diameter of the rolled piece fluctuates by ±5%, the arc-shaped working surface can maintain stable clamping force through dynamic adjustment of the contact area. At the same time, the transition between the plane working surface and the arc-shaped working surface forms a natural chip removal groove, which can timely remove the oxide scale generated during rolling to avoid surface scratches caused by foreign matter embedding.

[0025] Additional advantages, objects, and features of the application will be apparent to those skilled in the art upon examination of the following detailed description, it being understood that each BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 Physical diagram for changing K2 outlet twist flat guide roller to double R arc guide roller;

[0028] Figure 2 Physical diagram for changing K2 outlet double R arc guide roller to single edge R arc and the other side flat roller form;

[0029] Figure 3 Structure schematic diagram for changing flat roller to double R arc guide roller;

[0030] Figure 4 Structure schematic diagram for changing double R arc to single edge R arc. DETAILED DESCRIPTION

[0031] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined inventive purpose, the specific embodiments, structures, features and effects according to the present application will be described in detail below in combination with the drawings and preferred embodiments.

[0032] Embodiment one

[0033] This embodiment is aimed at the twist guide requirement of 20mm diameter round steel between K2 to K1 rack of finishing continuous flat rack, and details the specific parameters, assembly process and working principle of a twist guide structure for rolled piece. The structure realizes 90° accurate twist of elliptical cross-section rolled piece to round finished product through asymmetric clamping area design, combined with adjustable guide roller assembly and wear-resistant guide components, solves the problems of unstable clamping, surface damage and other problems of traditional symmetric guide roller, ensures that the twist angle deviation of rolled piece is controlled within ±2°, the surface roughness Ra≤0.8μm, and meets the high-precision rolled steel production requirements.

[0034] (1) Structure parameter design

[0035] Guide roller assembly core parameters:

[0036] First roller body (flat roller): flat working surface length 35 mm (30 mm of rolled piece width + 5 mm of redundancy), edge microfillet radius 1.5 mm, surface roughness Ra = 0.6 μm. Roller shaft diameter 20 mm, bearing seat forged from 45: steel, roller body rotation realized through deep groove ball bearing, rotation speed matching rolled piece transmission speed (8 m / s).

[0037] Second roller body (arc-shaped roller): semi-R arc-shaped working surface curvature radius R = 0.5D = 10 mm (D = 20 mm), arc center angle a = 110°, basic arc length calculated according to arc length formula: L = (p x 10 x 110) / 180 = 19.19 mm, arc length compensation amount AL = 0.04D = 0.8 mm, actual arc length 20 mm. Arc-shaped two end chamfer angle 40°, width 4 mm, transition fillet radius r = 6 mm.

[0038] Roller shaft spacing: initially set L = 1.1D = 22 mm, adjustable within 20.9-23.1 mm range through adjusting mechanism (adapt to ±5% diameter deviation), lead screw assembly adopts trapezoidal thread, adjusting accuracy 0.05 mm / turn.

[0039] Guiding and auxiliary components:

[0040] Outlet guide plate: guiding channel diameter 20 mm, inlet flaring angle 35°, flaring section length 120 mm. Inner wall sprayed with WC-Co wear-resistant coating, thickness 0.4 mm, hardness HRC 60-65.

[0041] Guiding conical surface: conical angle y = 65°, length 100 mm, surface diagonal line texture depth 0.8 mm, pitch 6 mm, transition fillet radius 12 mm.

[0042] Sensor assembly: first laser displacement sensor installed 50 mm before the inlet, detection range 10-30 mm, sampling frequency 1000 Hz; second sensor installed 30 mm after the outlet, resolution 0.01 mm, real-time transmission of data to PLC control system (Siemens S7-1200).

[0043] (2) Assembly process

[0044] Bearing seat installation: slide rail fixed to the rack crossbeam along the perpendicular roller shaft direction, rail parallelism error <0.1 mm / m. Bearing seat connected with slide rail through slide block, lead screw assembly (including hand wheel and locking nut) pre-installed on the side of bearing seat, ensuring smooth driving without jamming.

[0045] Roll body assembly: The first and second roll bodies are respectively hot-fitted on the roll shafts (with an interference of 0.02-0.03 mm), and after assembly, the radial runout is detected by a dial gauge to be ≤0.05 mm. The roll shafts are installed on the guide rail together with the bearing seat, and the parallelism error of the two roll axes is adjusted to be ≤0.03 mm / m, and the pre-tightening torque of the lock nut is 30 N·m.

[0046] Guide plate and sensor fixing: The outlet guide plate is fixed to the entry side of the guide roll assembly through a positioning pin, ensuring that the coaxiality of the channel axis and the center axis of the clamping area is ≤0.1 mm. The sensor is installed through a bracket, the laser beam is level with the axis of the rolled piece, and the deviation is ≤0.5 mm. The wiring is connected to the IO module of the control system.

[0047] Debugging and calibration: manually rotate the lead screw to adjust the roll spacing to 22 mm, and use a standard test bar (diameter 20 mm) to test the passability. Observe that the wrapping degree of the clamping area is ≥80%, start the simulation transmission, adjust the guide plate position through the sensor feedback, ensure that the test bar does not deviate, and the twist angle error is ≤1°.

[0048] (3) Working principle

[0049] Rolling piece guide-in stage: the K2 pass elliptical rolling piece (major axis 28 mm, minor axis 18 mm) enters the outlet guide plate at a speed of 8 m / s after rolling. The flared structure guides the rolling piece to move along the center line of the channel, the wear-resistant coating reduces the frictional resistance (friction coefficient μ=0.15), the edge of the planar working surface is slightly rounded to avoid scratching when the rolling piece enters, and the arc-shaped working surface chamfer transition area realizes smooth contact.

[0050] Asymmetric clamping action: after the rolling piece enters the clamping area, the planar working surface forms a point contact (contact area about 5 mm²) with one side of the rolling piece, and the arc-shaped working surface forms a line contact (contact arc length 15 mm) with the other side, forming a three-point positioning constraint. The clamping force is evenly distributed through the arc-shaped surface (unit pressure 2-3 MPa), the planar surface absorbs the slight deformation of the rolling piece (radial compression amount ≤0.1 mm), and rigid extrusion is avoided.

[0051] Torsion guiding process: due to the gradual change of the curvature of the arc-shaped working surface (R1=11 mm at the entry end and R2=9 mm at the exit end), the rolling piece is subjected to a lateral force during transmission, resulting in clockwise torsion. The larger curvature at the entry end reduces the initial resistance, and the smaller curvature at the exit end enhances the positioning, ensuring a 90° torsion accuracy. The guide conical surface diagonal lines assist in forming a pre-torsion trend, reducing the torsion resistance moment (≤5 N·m).

[0052] Dynamic adjustment mechanism: when the rolling piece diameter deviates by +4% (20.8 mm), the sensor detects the cross-section change, and the control system drives the lead screw assembly to adjust the spacing to 22.9 mm, maintaining a wrapping degree of ≥75%. If a surface defect with a depth of 0.12 mm is detected, the system immediately alarms and stops, with a response time of ≤0.5 s.

[0053] Chip removal and protection: The iron oxide scale generated by rolling (thickness 0.1-0.2 mm) is removed through the chip removal groove (width 3 mm) at the transition between the flat and arc surfaces, avoiding accumulation and scratching the surface. The surface of the guide roller is treated with chromium plating (thickness 0.05 mm), with a hardness of HRC 55-60 and an improved wear resistance of 30%.

[0054] (4) Performance test data

[0055] Torsion accuracy: After continuous rolling of 500 pieces, the torsion angle is sampled and detected, with a maximum deviation of 1.8° and an average value of 0.5°, which is better than the traditional structure (±3°).

[0056] Surface quality: The surface roughness of the rolled piece is Ra=0.6 μm, without defects such as indentation and scratches, with a qualified rate of 100%.

[0057] Stability: After continuous operation for 8 hours, the guide roller temperature is ≤60°C, the bearing temperature rise is ≤25°C, and there are no jamming or steel running accidents.

[0058] In summary, through precise parameter design and assembly and debugging, the asymmetric clamping structure is verified to be effective in the torsion of 20 mm round steel. Its core advantage is to achieve stable clamping using three-point positioning, combined with gradual curvature and dynamic adjustment to adapt to the deviation of the rolled piece. At the same time, the surface quality is guaranteed through chip removal and wear-resistant design. This scheme can be directly applied to similar specifications of bar production lines, significantly improving the torsion accuracy and production stability, and reducing the scrap rate to below 0.5%.

[0059] Example Two

[0060] This example optimizes the parameters and materials of the torsion guide structure for the torsion requirements of diameter 16 mm threaded steel (with ribs) between K2 and K1 racks, focusing on solving problems such as damage to the rib of threaded steel and large torsion resistance. By enhancing the adhesion of the arc-shaped working surface, improving wear resistance, and optimizing the adjustment mechanism, stable torsion of the ribbed rolled piece is achieved, ensuring that the rib height deviation is ≤0.1 mm and the torsion angle error is ≤1.5°, meeting the production standards of high-strength threaded steel.

[0061] (1) Structure parameter design

[0062] Core parameters of guide roller assembly:

[0063] First roller body (flat roller): working surface length 31 mm (rolled piece width 26 mm + 5 mm), micro-round corner radius 1 mm, surface roughness Ra=0.4 μm (mirror grinding), roller body made of alloy tool steel, quenched hardness HRC 58-62, wear resistance 30% better than ordinary carbon steel.

[0064] Second roller body (arc-shaped roller): curvature radius R = 0.45D = 7.2mm (D = 16mm), arc center angle a = 105°, basic arc length L = (pi x 7.2 x 105) / 180 = 13.19mm, AL = 0.035D = 0.56mm, actual arc length 13.75mm, chamfer 35° at both ends of the arc, width 3.5mm, transition fillet r = 5mm.

[0065] Roller shaft spacing: initial setting L = 1.08D = 17.28mm, adjustment range 16.32-18.24mm (±5% deviation), lead screw driven by servo motor, adjustment response speed 0.1mm / s.

[0066] Guiding and auxiliary components

[0067] Outlet guide plate: guiding channel diameter 16mm, flaring angle 30°, flaring segment length 110mm. Inner wall sprayed with ceramic coating, thickness 0.35mm, surface roughness Ra = 0.2um, friction coefficient mu = 0.12.

[0068] Guiding cone: cone angle gamma = 70°, length 90mm, diagonal stripe depth 0.6mm, pitch 5mm, transition fillet 11mm.

[0069] Sensor assembly: laser sensor used, detection range 8-24mm, accuracy ±0.005mm, supports high-speed transmission, communicates with PLC through EtherCAT.

[0070] (2) Assembly process

[0071] High-precision guide rail installation: linear guide rail selected, installation surface flatness error ≤0.05mm / m, guide rail parallelism ≤0.02mm / m, bearing seat and slider rigidly connected, clearance eliminated through bolt pre-tightening (torque 25N.m).

[0072] Roller body precision assembly: roller body and roller shaft use cold assembly process (roller shaft cooled to -50℃), radial runout after assembly ≤0.03mm, two roller axis height difference ≤0.02mm, parallelism calibrated by laser interferometer (error ≤0.01mm / m).

[0073] Servo adjustment system debugging: servo motor and lead screw connected through coupling, position ring gain set to 500Hz, ensuring adjustment accuracy ±0.01mm, PLC program written to realize PID control of sensor signal and adjustment amount.

[0074] Overall calibration: standard threaded steel test bar (diameter 16mm, rib height 3mm) used for testing, observation of thread rib and arc surface adhesion ≥90%, no extrusion deformation, simulated torsion process, torsion angle detected by second sensor, error controlled within ±0.5°.

[0075] (3) Working principle

[0076] Ribbed roll introduction: K2 pass oval thread steel (major axis 22 mm, minor axis 14 mm) enters the guide plate at a speed of 10 m / s after rolling, the flared structure guides the roll to be accurately centered, the ceramic coating reduces the friction damage of the rib (rib top wear ≤0.02 mm), the slightly rounded flat working surface avoids hooking the thread rib, and ensures smooth entry into the clamping area.

[0077] Asymmetric clamping and rib protection: the arc surface fits the non-rib side of the thread steel (contact arc length 12 mm), the flat surface contacts the ribbed side (point contact at the rib root), the clamping force is concentrated in the non-rib area (unit pressure 1.5-2 MPa), avoiding rib deformation under pressure (rib height deviation ≤0.05 mm).

[0078] Low resistance twisting process: the gradual change of the curvature of the arc surface (R1=7.92 mm→R2=6.48 mm) makes the roll slowly twist during transmission, the gap between the thread rib and the arc surface is kept at 0.2-0.3 mm, reducing the friction resistance, the guide conical surface slanting engages with the thread rib to generate auxiliary torque (≤3 N·m), reducing the main driving force.

[0079] Intelligent adjustment response: when the roll diameter deviates by -3% (15.52 mm) due to temperature changes, the first sensor detects it, and the PLC drives the servo motor to adjust the distance to 16.6 mm within 1 second, ensuring stable clamping. If the rib damage depth is 0.1 mm, the system will immediately stop and the alarm response time is ≤0.3 s.

[0080] Chip removal and wear resistance: the scale produced by thread rolling is quickly removed through the chip removal groove (width 2.5 mm) to avoid embedding into the thread groove, and the guide roller surface is nitrided (penetration depth 0.15 mm, hardness HV800), extending the service life to 800 tons / pair (traditional structure 500 tons).

[0081] (4) Performance test data

[0082] Twisting accuracy: after continuous rolling of 1000 pieces, the maximum deviation of the twisting angle is 1.2°, and the average deviation is 0.6°, which is better than the industry standard (±3°).

[0083] Surface and rib quality: thread rib height deviation ≤0.08 mm, surface without indentation and scratches, 99.8% pass rate.

[0084] Stability and life: continuous operation for 12 hours, guide roller temperature rise ≤20℃, bearing vibration value ≤0.05 mm / s, no fault shutdown record.

[0085] To sum up, the embodiment is directed to the torsion guide structure optimized for the characteristics of threaded steel, through the combination of precise design of asymmetric clamping area and servo adjustment system, the low damage and high precision torsion of ribbed rolled piece is realized. The core innovation point lies in the matching design of arc surface and rib-free area of threaded steel, cooperating with ceramic coating and nitriding treatment to improve wear resistance, and the intelligent adjustment system ensures the rapid response to size deviation. The scheme can be popularized to other specifications of threaded steel production line, significantly improving product quality and equipment life, and reducing production cost by about 15%.

[0086] The above is only the preferred embodiment of the present application, not any form of limitation on the present application, although the present application has been disclosed as above with the preferred embodiment, however, it is not intended to limit the present application, any person skilled in the art, without departing from the scope of the technical scheme of the present application, can make some changes or modifications to the above disclosed technical content to make equivalent embodiments with equivalent changes, but as long as it does not deviate from the technical scheme content of the present application, any modification, equivalent change and modification of the above embodiment according to the technical essence of the present application, all still belong to the scope of the technical scheme of the present application.

Claims

1. A torsion guiding structure for rolled products, characterized in that, The guiding structure includes a pair of guide roller assemblies for exit guides between continuous flat mill stands in finishing mill, the guide roller assembly being composed of a first roller body and a second roller body; The first roller body has a planar working surface; The second roll has a semi-R-shaped working surface, and its radius of curvature R and the equivalent diameter D of the workpiece section satisfy: 0.4D≤R≤0.6D; The planar working surface and the semi-R-shaped working surface are diagonally distributed, forming an asymmetrical clamping area.

2. The torsion guiding structure for rolled products according to claim 1, characterized in that, The guide roller assembly also includes a roller shaft and a bearing housing. The first roller body and the second roller body are respectively rotatably mounted in the bearing housing via the roller shaft, and the axes of the two roller bodies are arranged in parallel. The axial distance L and the equivalent diameter D of the workpiece cross section satisfy: 1.05D≤L≤1.15D.

3. A torsion guiding structure for rolled products according to claim 2, characterized in that, The bearing housing is equipped with an adjustment mechanism, which includes a sliding guide rail arranged vertically along the axis of the roller body, a screw assembly that drives the roller shaft to move along the guide rail, and a locking nut for locking the position. By adjusting the distance between the two roller bodies, it can accommodate rolled parts with a diameter deviation within ±5%, ensuring the stable wrapping of the rolled part by the asymmetric clamping area, while avoiding the surface extrusion deformation of the rolled part caused by too small a distance or the clamping failure caused by too large a distance.

4. A torsion guiding structure for rolled products according to claim 1, characterized in that, The central angle α of the semi-R-shaped working surface is 100°-120°, and its arc length L satisfies the relationship with the nominal diameter D of the rolled piece: ,in, Let be the radius of curvature. For arc length compensation and ; Both ends of the semi-R-shaped working surface are provided with chamfered transition areas, with chamfer angles of 30°-45° and chamfer widths of 3- .

5. A torsion guiding structure for rolled products according to claim 1, characterized in that, The edge of the planar working surface is provided with a micro-rounded corner with a radius of 1-2mm, and the surface roughness Ra of the planar working surface is ≤0.8μm; The axial length of the first and second rollers is 10-15mm larger than the width of the workpiece to prevent lateral displacement of the workpiece, and the two ends of the arc-shaped working surface are provided with transition fillets with a radius r of 5-8mm.

6. A torsion guiding structure for rolled products according to claim 1, characterized in that, The guide roller assembly also includes an outlet guide plate that works in conjunction with the first roller body and the second roller body. The outlet guide plate is located on the feed side of the guide roller assembly. The axis of its guide channel is collinear with the central axis of the asymmetric clamping area. The inlet end of the guide channel is provided with a flared structure with a flaring angle β of 30°-45° and a flared section length of 100-150mm. The inner wall of the guide channel is provided with a wear-resistant coating with a coating thickness of 0.3-0.5mm to ensure that the rolled piece enters the asymmetric clamping area along a predetermined trajectory and to reduce the lateral impact force on the guide roller.

7. A torsion guiding structure for rolled products according to claim 1, characterized in that, The radius of curvature R of the semi-R-shaped working surface is gradually set along the axis of the roll body. The radius of curvature R1 near the feed end and the radius of curvature R2 near the discharge end satisfy: R1=1.1R, R2=0.9R, and R1 and R2 are transitioned by a smooth curve with a transition section length of 0.5L1, where L1 is the length of the roll body, to ensure that the rolled workpiece enters the next stand in a vertical posture, reducing bite failures caused by posture deviation.

8. A torsion guiding structure for rolled products according to claim 1, characterized in that, The entrance end of the asymmetric clamping area is provided with a guide cone surface. The cone angle γ of the guide cone surface is 60°-75°, the cone surface length is 80-120mm, and the cone surface smoothly transitions with the working surfaces of the first and second rollers with a transition radius of 10-15mm. The surface of the guide cone surface is provided with wear-resistant textures. The textures are oblique lines at a 45° angle to the axis of the roller, with a depth of 0.5-1mm and a spacing of 5-8mm. This not only enhances the initial guiding effect on the workpiece, but also absorbs the impact force when the workpiece enters through the micro-deformation of the textures, reducing the rigid collision between the workpiece and the roller. At the same time, the oblique texture structure can help the workpiece form a pre-torsion tendency in the early stage of torsion, improving the torsion efficiency.

9. A torsion guiding structure for rolled products according to claim 1, characterized in that, It also includes a sensor assembly for detecting the position of the rolled piece. The sensor assembly includes a first laser displacement sensor located at the entrance of the asymmetric clamping area and a second laser displacement sensor located at the exit. The first laser displacement sensor is used to detect the cross-sectional dimensions and center position of the rolled piece before it enters the area, and the second laser displacement sensor is used to detect the torsion angle and surface quality of the rolled piece after it leaves the area. The detection accuracy of the sensors is ±0.01mm, and the sampling frequency is 1000Hz. The detection data is transmitted to the control system in real time. The control system dynamically adjusts the distance and speed of the two rollers through the adjustment mechanism according to the detection results. When the torsion angle deviation of the rolled piece exceeds ±5° or a defect with a depth ≥0.1mm is detected on the surface, the control system automatically issues an alarm signal and stops the machine to ensure stable product quality.

10. A torsion guiding structure for rolled products according to claim 1, characterized in that, The guide roller assembly is used as an exit guide between stands K2 and K1 in the finishing continuous flat mill. The rolled piece in pass K2 has an elliptical cross section, and pass K1 is the finishing mill. The asymmetric clamping area of ​​the guide roller assembly is used to twist the elliptical rolled piece of pass K2 by 90 degrees and then guide it into stand K1.

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