A method for laser remanufacturing of an input drive shaft of a bar KOCKS reducing mill

Abstract

The application provides a kind of bar KOCKS reducing mill input drive shaft laser remanufacturing method, including two kinds of shafts used for the reducing mill, two kinds of shafts are long shaft and short shaft respectively, one end of the shaft is connected with disc, one side of the disc is provided with keyway, and the outer wall of the disc is connected with ring on the circumferential side.The application utilizes the characteristics of laser cladding technology, the cladding layer structure is fine and dense, the interface between the cladding layer and the substrate is metallurgical bonding, the composition and dilution rate of the cladding layer are controllable, and selective cladding can be selected according to different parts and different use requirements, etc.The alloy powder with high hardness, intermetallic friction resistance and strong wear and impact resistance is used as the laser material functional layer in the key position, which improves the service life of the working surface.The process is simple, the operability is strong, the process is simple, green and environmentally friendly, and has significant economic and social benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of input drive shaft laser remanufacturing, in particular to a kind of bar KOCKS reducing mill input drive shaft laser remanufacturing method. BACKGROUND

[0002] Three-roll reducing mill is the key equipment of bar and wire rod mill high precision, continuous, high speed, and three-roll reducing mill input shaft body assembly is its core component.Each group of input drive shaft is divided into long shaft and short shaft two shaft body groups, and long shaft and short shaft are clamped by a pull rod and cross key Hard alloy, high speed steel roll ring, bar moves at high speed on roll ring, and wear occurs between stop mouth platform of disc body and roll ring mating surface during production assembly and running, which leads to excessive gap and affects normal work, especially after wear exceeds the tolerance, due to size exceeds the tolerance, relative slip occurs between roll ring and roll ring mating surface during rolling, which aggravates the wear of roll ring mating surface and affects normal production;In addition, frequent start-stop process causes wear between cross key and keyway of long shaft and short shaft, resulting in gap, and with the extension of time, excessive gap affects the safe operation of equipment, the service life of roll ring mating surface, stop mouth and keyway matching area of disc body greatly limits the continuity of production line, for these easily-worn parts, high hardness quenching treatment or high-frequency quenching process is used to improve the wear resistance of the body material during new production, but the nature of the material does not change, so it cannot meet the requirements of extending the service life of wear resistance and impact resistance. SUMMARY

[0003] The present application aims at the existing device a kind of bar KOCKS reducing mill input drive shaft laser remanufacturing method to solve the problems raised in the above background.

[0004] In order to solve the above technical problems, the present application provides the following technical scheme: a kind of bar KOCKS reducing mill input drive shaft laser remanufacturing method, including two types of shafts used for the reducing mill, characterized in that, two types of shafts are long shaft and short shaft respectively;

[0005] One end of the shaft body is connected with a disc body, a keyway is formed on one side of the disc body, and a ring body is connected to the outer wall of the disc body, the joint between the upper side of the ring body and the disc body is a roll ring installation stop mouth, and the upper side of the ring body is provided with a roll ring mating surface;

[0006] The method for remanufacturing the drive shaft includes the following steps:

[0007] Step S01, selecting a forging, the composition of the forging is carbon 0.14-0.19%, phosphorus ≤0.035%, sulfur ≤0.035%, silicon 0.17-0.37%, chromium 1.50-1.80%, nickel 1.40-1.70%, molybdenum 0.25-0.35%, and the rest is iron;

[0008] Step S02, blank manufacturing processing, based on the blank drawing of the forging, the transmission shaft is forged;

[0009] Step S03, forging detection, the forging obtained in step S02 is detected by surface penetration detection and ultrasonic detection, and the chemical composition and hardness of the forging are detected to determine whether the quality of the forging meets the standard;

[0010] Step S04, rough machining of the forging, the forging is rough machined according to the drawing, and the ultrasonic detection is performed again on the overall forging;

[0011] Step S05, quenching and tempering treatment, the forging obtained in step S04 is subjected to quenching and tempering treatment, and the hardness of the forging is controlled at HRC 30-35 during the quenching and tempering treatment;

[0012] Step S06, mechanical property test, the finished bar obtained in step S05 is sampled for mechanical property test to determine whether the chemical composition and mechanical properties of the forging meet the requirements;

[0013] Step S07, semi-finishing, the forging is subjected to semi-finishing treatment, and a 1.0-1.5mm amount of laser remanufacturing layer is left on the roll ring mounting stop and the roll ring mating surface and the keyway on both sides thereof;

[0014] Step S08, laser cladding, high-hardness wear-resistant materials are first cladded on the roll ring mounting stop and the roll ring mating surface of the input shaft, and impact-resistant wear-resistant materials are cladded on the keyway on both sides of the input shaft, wherein the material composition of the high-hardness wear-resistant materials is carbon 0.15-0.21%, phosphorus ≤0.01%, sulfur ≤0.01%, silicon 0.8-1.2%, chromium 15-18%, nickel 1.6-2.4%, molybdenum 0.3-0.45%, manganese 0.1-0.25%, beryllium 0.9-1.3%, and the rest is iron, and the material composition of the impact-resistant wear-resistant materials is carbon 0.02-0.08%, phosphorus ≤0.04%, sulfur ≤0.03%, silicon 0.35-0.45%, chromium 24-27%, nickel 10-11%, molybdenum Mo 0.7-1.2%, manganese 0.4-0.6%, iron 0.7-1.2%, tungsten 6-8%, and the rest is cobalt;

[0015] Step S09, finishing, after the forging meets the requirements of the drawing, the subsequent finishing requirements of the transmission shaft are completed, the laser remanufacturing area of the forging is detected by surface coloring and flaw detection, and the overall comprehensive size detection of the forging is carried out, the hardness value detection of the working matching surface is carried out, so as to judge whether the forging meets the standard;

[0016] Step S10, anticorrosion packaging, the product obtained in step S09 is anticorrosion packaged.

[0017] Compared with the prior art, the beneficial effects achieved by the present application are:

[0018] The present application utilizes the characteristics of laser cladding technology, the cladding layer structure is fine and dense, the interface between the cladding layer and the substrate is metallurgical bonding, the composition and dilution rate of the cladding layer are controllable, and selective cladding can be selected according to different parts and different use requirements. In the key parts, the alloy powder with high hardness, intermetallic friction resistance and strong wear and impact resistance is used as the laser material functional layer, and the service life of the working surface is improved. The present application has the advantages of simple process, strong operability, simple process, green environmental protection, significant economic benefit and social benefit. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application. In the drawings:

[0020] Figure 1 It is a remanufacturing flow diagram of the transmission shaft of the present application;

[0021] Figure 2 It is a schematic diagram of a middle and short shaft cross section of the shaft body in the embodiment of the present application;

[0022] Figure 3 It is a schematic diagram of a middle and long shaft cross section of the shaft body in the embodiment of the present application;

[0023] Figure 4 It is a schematic diagram of a middle and long shaft cross section of the shaft body in the embodiment of the present application;

[0024] Figure 5 It is Figure 3 It is a local enlarged view of A;

[0025] Figure 6 It is a schematic diagram of the composition of the long shaft and the short shaft in the shaft body in the embodiment of the present application;

[0026] Figure 7 It is a schematic diagram of the combined structure of the shaft body in the second embodiment of the present application;

[0027] Figure 8 It is a schematic diagram of the combined structure of the shaft body in the second embodiment of the present application.

[0028] In the figure: 1, shaft body; 2, disc body; 3, keyway; 4, ring body; 5, through hole; 6, mounting ring; 7, groove; 8, cylindrical protrusion; 9, positioning hole; 10, threaded disc; 11, sliding slot; 12, clamping rod; 13, clamping groove; 14, connecting ring; 15, annular groove; 16, roller ring matching surface; 17, roller ring mounting stop. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be further described in detail below in combination with preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0030] Please refer to Figures 1-8 The present application provides a technical solution: a method for laser remanufacturing of an input transmission shaft of a bar KOCKS reducing sizing mill, comprising two types of shaft bodies 1 used for the reducing sizing mill, the two types of shaft bodies 1 being a long shaft and a short shaft, the long shaft comprising: a plurality of connecting shafts combined, and the plurality of connecting shafts connected in sequence from one side of a disc body, the diameters of the plurality of connecting shafts being 100 mm, 98 mm, 100 mm and 91.2 mm respectively, and the connecting portions of the plurality of connecting shafts being provided with chamfers, and the length of the long shaft combined with the disc body 2 being 662.5 mm, and the short shaft comprising a fixed shaft connected with the disc body and having a diameter of 100 mm;

[0031] One end of the shaft body 1 is connected with the disc body 2, one side of the disc body 2 is provided with a keyway 3, and the peripheral side of the outer wall of the disc body 2 is connected with a ring body 4, the joint between the upper side of the ring body 4 and the disc body 2 is a roller ring mounting stop 17, and the upper side of the ring body 4 is provided as a roller ring matching surface 16, the length of the keyway 3 is 182 mm, the width is 45 mm, and R11 round corners are provided at the four corners of the inner wall of the keyway 3, the diameter of the disc body is 215 mm, the diameter of the ring body 4 is 295 mm, the height between the upper side of the ring body 4 and the disc body 2 is 7 mm, and the total thickness of the disc body 2 is 44.5 mm;

[0032] One side of the keyway 3 is provided with a through hole 5, and the through hole 5 penetrates to the end of the output end away from the disc body 2;

[0033] The method for remanufacturing the transmission shaft comprises the following steps:

[0034] Step S01, selecting a forging, the composition of the forging is 0.14-0.19% of carbon, ≤0.035% of phosphorus, ≤0.035% of sulfur, 0.17-0.37% of silicon, 1.50-1.80% of chromium, 1.40-1.70% of nickel, 0.25-0.35% of molybdenum, and the rest is iron;

[0035] Step S02, blank manufacturing processing, based on the blank drawing of the forging, the transmission shaft is forged;

[0036] Step S03, forging detection, the forging obtained in step S02 is detected by surface penetration detection and ultrasonic detection, and the chemical composition and hardness of the forging are detected to determine whether the quality of the forging meets the standard;

[0037] Step S04, rough machining of the forging, the forging is rough machined according to the drawing, and the ultrasonic detection is performed again on the overall forging;

[0038] Step S05, quenching and tempering treatment, the forging obtained in step S04 is subjected to quenching and tempering treatment, and the hardness of the forging is controlled at HRC 30-35 during the quenching and tempering treatment;

[0039] Step S06, mechanical property test, the finished bar obtained in step S05 is sampled for mechanical property test to determine whether the chemical composition and mechanical properties of the forging meet the requirements; the standard for the mechanical property test of the forging is that the tensile strength σb(MPa) is greater than or equal to 1080, the yield strength σs(MPa) is greater than or equal to 790, the elongation δ(5%) is greater than or equal to 8, and the reduction of area Ψ(%) is greater than or equal to 35;

[0040] Step S07, semi-finishing, the forging is subjected to semi-finishing treatment, and a laser remanufacturing layer with a thickness of 1.0-1.5mm is reserved on the two sides of the key groove 3 of the roll ring mounting stop 17 and the roll ring matching surface 16; by reserving a manufacturing layer with a thickness of 1.0-1.5mm, the size deviation caused by subsequent cladding of the forging is avoided, thereby reducing the unqualified condition of the forging due to the size;

[0041] Step S08, laser cladding, high-hardness wear-resistant materials are cladded on the roll ring mounting stop 17 and the roll ring matching surface 16 of the input shaft, and impact-resistant wear-resistant materials are cladded on the two sides of the key groove 3 of the input shaft; the high-hardness wear-resistant materials and the impact-resistant wear-resistant materials can strengthen the easily worn parts of the transmission shaft, reduce the damage of the roll ring mounting stop 17, the roll ring matching surface 16 and the key groove 3 caused by long-term use, and increase the service life of the transmission shaft, thereby reducing the economic loss caused by the damage of the transmission shaft to the enterprise;

[0042] Step S09, finishing, after the forging is completed according to the drawing requirements, the subsequent finishing requirements of the transmission shaft are completed, the laser remanufacturing area of the forging is detected by surface coloring and flaw detection, and the overall size of the forging is detected, the hardness value of the working matching surface is detected, so as to judge whether the forging meets the standard;

[0043] Step S10, corrosion protection packaging, the product obtained in step S08 is packaged for corrosion protection.

[0044] Specifically, the rough machining, semi-finishing and finishing can be carried out by using a numerical control lathe or a milling machine.

[0045] When the transmission shaft needs to be manufactured, the personnel first prepare the blank, and use the numerical control lathe or the milling machine to process the forging into the shaft body, then the personnel sequentially process the ring body and the disc body, then the personnel open the surface penetration flaw detection, ultrasonic flaw detection, chemical composition detection and mechanical property evaluation of the processed forging, if the forging is qualified, it enters the rough machining, and is processed according to the drawing, then the personnel perform the quenching and tempering treatment on the rough machining completed forging, and test the mechanical properties of the processed forging, after the detection is completed, the semi-precision machining is carried out, and in the process of machining, a laser remanufacturing layer of 1.0-1.5mm is designed on the key matching position of the ring ring mounting stop 17 and the ring ring matching surface 16, the key groove 3 two sides, so as to facilitate the subsequent material cladding, then the personnel use the laser cladding device to cladding high hardness wear-resistant material between the ring ring mounting stop 17 and the ring ring matching surface 16 of the input shaft, and cladding impact-resistant wear-resistant material on the two sides of the key groove 3, then the subsequent finishing of the forging is completed according to the drawing requirements, after the machining is completed, the surface coloring flaw detection of the laser remanufacturing area is carried out, then the overall size detection of the finished forging is carried out, and after the forging meets the standard, the corrosion protection packaging treatment is carried out.

[0046] The material composition of the high hardness wear-resistant material is 0.15-0.21% of carbon, ≤0.01% of phosphorus, ≤0.01% of sulfur, 0.8-1.2% of silicon, 15-18% of chromium, 1.6-2.4% of nickel, 0.3-0.45% of molybdenum, 0.1-0.25% of manganese, 0.9-1.3% of beryllium, and the rest is iron. This material has the effect of high hardness and high performance, thereby improving the service life of the ring ring mounting stop 17 and the ring ring matching surface 16 of the input shaft.

[0047] The material composition of the impact-resistant wear-resistant material is 0.02-0.08% of carbon, ≤0.04% of phosphorus, ≤0.03% of sulfur, 0.35-0.45% of silicon, 24-27% of chromium, 10-11% of nickel, 0.7-1.2% of molybdenum, 0.4-0.6% of manganese, 0.7-1.2% of iron, 6-8% of tungsten, and the rest is cobalt. The material has the effects of impact resistance, high hardness, and good wear resistance, thereby prolonging the service life of the side surface of the key groove 3 of the input shaft.

[0048] The ultrasonic flaw detection and the surface penetration detection method of the embodiment both adopt longitudinal wave radiation method, the detection frequency is 2.5MHZ, and the detection instrument is CTS-22A. Through multiple detections, the defective products generated in the process of machining the transmission shaft can be reduced, and the situation that the enterprise reputation is affected due to the poor use effect of the transmission shaft can be avoided, thereby increasing the economic effect of the enterprise.

[0049] Specifically, the laser cladding process parameters are as follows: cladding power 2500-3800W, spot diameter 3-4mm, cladding scanning speed 1000-1500mm / min, overlapping rate 30-50%, argon protection, and effective thickness of cladding layer 0.8-1.0mm. Such parameters can make the personnel obtain the best effect during laser cladding, thereby improving the quality of the cladding material of the shaft body 1. The hardness of the roller ring matching surface 16 of the shaft body 1 and the roller ring mounting stop 17 is HRC50-55, and the hardness of the forged piece during the quenching and tempering process is controlled to be HRC30-35.

[0050] Specifically, the sleeve, the long shaft and the short shaft are located in the sleeve, and the cross key is arranged between the disc bodies of the long shaft and the short shaft, and the cross key contacts the surface of the ring body and the inside of the two key grooves.

[0051] Embodiment one: the shaft body 1 and the disc body 2 are connected in a direct forming mode;

[0052] According to Figures 2-5 As shown in the figure, the shaft body 1 and the disc body 2 can be directly machined into a transmission shaft by using a numerical control lathe, which makes the personnel more efficient in machining the transmission shaft.

[0053] Embodiment two: the shaft body 1 and the disc body 2 can be connected in a detachable mode;

[0054] According to Figures 7-8As shown, the one end of the shaft body 1 is connected with the mounting ring 6, one side of the disc body 2 is provided with the groove 7 matched with the mounting ring 6, and the mounting ring 6 is slidingly fitted in the groove 7. The inner wall of the groove 7 is connected with a plurality of columnar protrusions 8 in a ring shape. The upper and lower portions of the mounting ring 6 are provided with a plurality of positioning holes 9 matched with the columnar protrusions 8. The one end of the shaft body 1 is rotatably provided with the threaded disc 10. The one side of the positioning hole 9 is provided with the sliding slot 11. The inner side of the sliding slot 11 is slidingly fitted with the clamping rod 12 matched with the threaded disc 10. The circumferential side of the columnar protrusion 8 is provided with a plurality of clamping grooves 13 matched with the clamping rod 12. The inner wall of the threaded disc 10 is provided with the connecting ring 14 with a T-shaped cross section. The circumferential side of the shaft body 1 is provided with the annular groove 15 matched with the connecting ring 14. The threaded disc 10 is not suspended, the clamping rod 12 is a U-shaped rod structure, the U-shaped rod is slidingly connected with the protrusion below the sliding slot 11, the inner wall of the sliding slot 11 is provided with the notch for the protrusion to slide, the threaded disc 10 is provided with the friction lines, the friction lines facilitate the rotation of the threaded disc 10, the lower portion of the threaded disc 10 is provided with the first flat screw, the upper portion of the clamping rod 12 is provided with the second flat screw matched with the first flat screw, and the self-locking property between the first flat screw and the second flat screw can better improve the stability of the connection between the shaft body 1 and the disc body 2.

[0055] When it is necessary to separate the shaft body 1 and the disc body 2, the threaded disc 10 is pushed to rotate on the circumferential side of the shaft body 1. Then, the clamping rod 12 is driven to slide out of the clamping groove 13 of the columnar protrusion 8 along the sliding slot 11 through the cooperation of the first flat screw and the second flat screw. Then, the shaft body 1 is pulled to one side to make the mounting ring 6 connected with the shaft body 1 slide out of the groove 7, and the columnar protrusion 8 slides out of the positioning hole 9. Thus, the shaft body 1 and the disc body 2 are disassembled. When the disc body 2 and the shaft body 1 need to be assembled, the same operation is performed.

[0056] The shaft body 1 and the disc body 2 can be disassembled. When the disc body 2 is damaged, the disc body 2 can be disassembled and then installed on the one end of the shaft body 1. The damaged single component can be directly replaced, the cost caused by the damage of the transmission shaft is reduced, the disassembly method is simple, and the disassembly speed of the shaft body 1 and the disc body 2 is improved.

[0057] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0058] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for laser remanufacturing of the input drive shaft of a KOCKS bar reduction sizing mill, comprising supplying the reduction sizing mill with... The two types of shafts (1) used are characterized in that, The two types of shafts (1) are the major axis and the minor axis, respectively; One end of the shaft (1) is connected to the disc (2), and a keyway (3) is provided on one side of the disc (2). A ring (4) is connected to the periphery of the outer wall of the disc (2). The joint between the upper side of the ring (4) and the disc (2) is a roller ring mounting stop (17), and the upper part of the ring (4) is set as a roller ring mating surface (16). The method for remanufacturing the drive shaft includes the following steps: Step S01: Select a forging. The composition of the forging is: carbon 0.14-0.19%, phosphorus ≤0.035%, sulfur ≤0.035%, silicon 0.17-0.37%, chromium 1.50-1.80%, nickel 1.40-1.70%, molybdenum 0.25-0.35%, manganese 0.5%, and the remainder is iron. Step S02, blank manufacturing and processing: the drive shaft is forged based on the blank drawing of the forging; Step S03, forging inspection: The forgings obtained in step S02 are subjected to surface penetrant testing, ultrasonic testing, chemical composition testing, and hardness testing to determine whether the forging quality meets the standards. Step S04: Rough machining of the forging. The forging is rough machined according to the drawings, and the whole forging is subjected to ultrasonic flaw detection again. Step S05, quenching and tempering treatment: the forging obtained in step S04 is quenched and tempered, and the hardness of the forging is controlled at HRC30-35 during the quenching and tempering treatment. Step S06, mechanical property test: Take a sample of the finished bar obtained in step S05 for mechanical property test to check whether the chemical composition and mechanical properties of the forging meet the requirements. Step S07, semi-finishing, the forging is semi-finished and a laser remanufacturing layer of 1.0-1.5mm is left on both sides of the roller ring mounting stop (17), the roller ring mating surface (16) and the keyway (3); Step S08, laser cladding: First, high-hardness wear-resistant material is clad onto the roller ring mounting stop (17) and the roller ring mating surface (16) of the input drive shaft. Simultaneously, impact-resistant wear-resistant material is clad onto both sides of the keyway (3) of the input shaft. The high-hardness wear-resistant material consists of 0.15-0.21% carbon, ≤0.01% phosphorus, ≤0.01% sulfur, 0.8-1.2% silicon, 15-18% chromium, 1.6-2.4% nickel, 0.3-0.45% molybdenum, 0.1-0.25% manganese, 0.9-1.3% beryllium, with the remainder being iron. The impact-resistant wear-resistant material consists of 0.02-0.08% carbon, ≤0.04% phosphorus, ≤0.03% sulfur, and 0.35-0.08% silicon. 0.45%, chromium 24-27%, nickel 10-11%, molybdenum (Mo) 0.7-1.2%, manganese 0.4-0.6%, iron 0.7-1.2%, tungsten 6-8%, the remainder being cobalt; Step S09, finishing: The forging is finished according to the drawing requirements for the subsequent finishing of the drive shaft. Then, the laser remanufacturing area of ​​the forging is subjected to surface coloring flaw detection, and the overall dimensions of the forging are inspected. The hardness value of the working mating surface is also tested to determine whether the forging meets the standards. Step S10, anti-corrosion packaging: Package the product obtained in step S09 with anti-corrosion materials.

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