Duplex-metal stainless steel acid-alkali-resistant anti-corrosion screw and production equipment thereof

Abstract

The bimetallic stainless steel acid-alkali-resistant anti-corrosion screw comprises a box body and a screw body, guide roller sets are installed on the inner sides and the outer sides of the two ends of the box body correspondingly, and a plurality of finishing roller sets are movably installed in one end of the box body through bearings; a plurality of rolling roller sets are movably installed in the middle of the box body through bearings, a supporting frame is fixedly installed on the inner wall of the box body, and a plurality of supporting bearings are connected to the inner side of the supporting frame in a sleeving mode; the stainless steel band and the carbon steel rod are subjected to rough microcosmic surface polishing, so that the friction force of rough contact surfaces of the stainless steel band and the carbon steel rod is increased, then the stainless steel band and the carbon steel rod are in close contact under rolling of the rolling roller set after winding, follow-up electromagnetic induction heating treatment is facilitated, interface microgaps are eliminated, and the surface roughness is improved. And an interpenetrating transition layer is formed on the microscopic layer surfaces of the stainless steel band and the carbon steel rod, and the bonding strength is improved to 400 MPa or above from 100-200 MPa of mechanical bonding and is close to the strength of a single material.

Description

Technical Field

[0001] This invention relates to the field of stainless steel anti-corrosion screw production technology, specifically to a bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment. Background Technology

[0002] Bimetallic screws are fasteners made by integrating two complementary metal materials through a metallurgical bonding process. They typically use stainless steel (304 / 316L / 2205, etc., providing excellent corrosion resistance) as the outer layer and carbon steel / alloy steel (SCM435 / 17-4PH, etc., strengthened by heat treatment) as the inner layer or tip. This solves the problems of insufficient strength and weak drilling ability of pure stainless steel screws, while also making up for the shortcomings of ordinary carbon steel screws that are prone to corrosion. They have the core advantages of corrosion resistance, high strength, and easy installation, and are widely used in construction, photovoltaic, chemical, marine engineering and other scenarios that require both harsh environmental resistance and fastening reliability.

[0003] Bimetallic screws are fasteners made by integrating two complementary metal materials through a metallurgical bonding process. They are typically produced using a combination of two metals to achieve advantages in strength and acid / alkali resistance. Existing production methods usually involve connecting a stainless steel cylinder and a carbon steel rod together and then cold-forging them. This method suffers from insufficient diffusion at the microscopic level, failing to form a dense transition layer, resulting in low interfacial bonding. The different elongation and hardness of the two materials lead to uneven deformation and cracking, thus reducing service life. Furthermore, the debris and gases generated during production can splash and spread, causing environmental pollution in the workshop. Therefore, this paper proposes a bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment, comprising a housing and a screw body. Guide roller sets are installed on the inner and outer sides of both ends of the housing. Several dressing roller sets are movably installed inside one end of the housing via bearings. Several rolling roller sets are movably installed inside the middle part of the housing via bearings. A support frame is fixedly installed on the inner wall of the housing. Several support bearings are sleeved on the inner side of the support frame. Support rings are sleeved on the inner side of the support bearings. Both ends of the support ring are fixedly installed on the outer sides. A driven gear ring is fixedly fitted onto the outer side of the driven gear ring via bolts. A mounting seat one is bolted to the outer side of the driven gear ring, and a mounting seat two is bolted to the other side of the driven gear ring. Both mounting seats one and two have steel strip unwinding mechanisms rotatably mounted on their inner sides via bearings. A drive gear meshes with the outer side of the driven gear ring, and a servo drive motor two is driven through one side of the drive gear. Several bearing supports are fixedly installed at the bottom of the inner cavity of the housing. A plastic support tube is movably fitted inside the top of each bearing support, and a chain drive is driven through the outer side of one end of the plastic support tube. The chain drive mechanism has a servo drive motor connected to the other end. A grinding sleeve is movably inserted into the interior of one end of the molding support tube via a groove. Several axial flow fan blades are fixedly sleeved on the outer side of the molding support tube. A mounting flange is fixedly installed on the outer side of the grinding sleeve. A steel wool ball is fixedly installed on the inner side of the grinding sleeve. A mounting ring is movably sleeved on the outer side of the other end of the molding support tube. A grinding steel wire bundle is fixedly installed on the outer side of the mounting ring. Several mounting bolts pass through the interior of the mounting ring. The interior of the housing at the end furthest from the dressing roller group... Two heat insulation boards are fixedly installed. Air outlet pipes are fixedly installed on opposite sides of the two heat insulation boards. Several air outlet holes are opened on the inner side of the air outlet pipes. A protective gas connection pipe is connected to the top of the air outlet pipes. A heat insulation chamber is set inside the end of the box away from the dressing roller group. A heat insulation board is set on one side of the heat insulation chamber. A preheating extrusion mold is fixedly installed on one side of the heat insulation board. Through holes are opened inside the box, the heat insulation board, and the heat insulation board. An electromagnetic heating component is set inside the box.

[0006] A screw head is fixedly installed on the top of the screw body, a cone is fixedly installed on the bottom of the screw body, and several tapping threads are fixedly installed on the outer side of the cone. The screw body includes a stainless steel strip layer and an alloy steel column.

[0007] Preferably, the guide roller group includes a lateral limiting roller and a vertical limiting roller, and a cross limiting roller group is formed on the outside of the through hole.

[0008] Preferably, an air pump is fixedly installed on the top of the housing, the input end of the air pump is connected to a gas filter, the top end of the gas filter is connected to a telescopic sleeve, the movable part of the telescopic sleeve is fixedly sleeved and connected to the top of the inner cavity of the housing, the gas filter is fixedly installed on the top of the housing, and the output end of the air pump is connected to an external pipe.

[0009] Preferably, both the rolling roller group and the trimming roller group pass through the housing and extend to the outside of the housing via bearings. A transmission gear is fixedly installed on the outside of one end of each of the rolling roller group and the trimming roller group. A drive gear meshes with the outside of one of the transmission gears. A reduction servo motor is connected to one side of the drive gear. The reduction servo motor is fixedly installed on the outside of the housing.

[0010] Preferably, the driven gear ring has several mounting holes II inside, which are evenly distributed circumferentially inside the driven gear ring. The support frame has several mounting holes I inside, which are evenly distributed circumferentially inside the support frame. Mounting seat I and mounting seat II are both installed inside the mounting holes II by bolts. The steel strip unwinding mechanism is inclinedly distributed on the inner side of the support ring. The servo drive motor II is fixedly installed on the inner wall of the housing.

[0011] Preferably, the servo drive motor is fixedly installed inside the housing by a bracket, the mounting flange is fixedly installed on the outside of the plastic support tube by a flange and bolts, the outer side of one end of the grinding sleeve is flared, the mounting bolt thread passes through the mounting ring and extends into the inside of the plastic support tube, the plastic support tube and the support ring are coaxially arranged, the end of the plastic support tube away from the grinding sleeve is chamfered, the axial flow fan blades are evenly distributed circumferentially on the outside of the plastic support tube, the position of the grinding steel wire bundle corresponds to the position of the steel strip unwinding mechanism, the support frame is located on the opposite side of the rolling roller group and the bearing bracket, and the plastic support tube is located on the opposite side of the support ring and the dressing roller group.

[0012] Preferably, the protective gas connecting pipe is fixedly inserted through the box and extends to the outside of the box. The vent holes are evenly distributed in a circumferential linear pattern on the inside of the vent pipe. The preheating extrusion die is located on the opposite side of the first and second heat insulation boards. The first heat insulation board is fixedly installed inside the box. The position of the through hole corresponds to the position of the electromagnetic heating component, the rolling roller group, the support ring, the molding support pipe, and the trimming roller group. The preheating extrusion die is an extrusion die with a preheating function. The through hole is opened through the inside of the box, the first heat insulation board, and the second heat insulation board.

[0013] Preferably, the electromagnetic heating assembly is fixedly installed inside the housing by a bracket. The electromagnetic heating assembly includes an electromagnetic heating tube sleeve and a ceramic heat insulation layer. The ceramic heat insulation layer is located outside the electromagnetic heating tube sleeve. The electromagnetic heating assembly and the through hole are coaxially arranged. The output end of the electromagnetic heating assembly is located inside the air outlet pipe.

[0014] Preferably, the stainless steel strip covers the outside of the alloy steel column, the tapping teeth are evenly distributed circumferentially on the outside of the cone, the stainless steel strip is made of stainless steel, and the alloy steel column is made of either carbon steel or alloy steel.

[0015] Preferably, a smart control panel is fixedly installed on the front of the box, a slag discharge pipe is connected to the bottom of the box, an inspection door is movably installed on the front of the box, and an inspection port adapted to the inspection door is opened on the front of the box.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When the equipment is in use, the stainless steel strip is installed at the position of the steel strip unwinding mechanism, and the carbon steel rod is passed through the through hole and along the central axis from one end of the box to the other end. The carbon steel rod is straightened by the extrusion transmission of the dressing roller group. Then the carbon steel rod passes through the plastic support tube. At this time, the servo drive motor one starts to rotate and causes the plastic support tube to rotate via the chain transmission mechanism. The rotation of the plastic support tube drives the grinding sleeve to rotate and grind the outer side of the carbon steel rod with steel wool. Then it passes through the plastic support tube and the inner side of the support ring. At this time, the stainless steel strip of the steel strip unwinding mechanism is wound around the outer side of the carbon steel rod, and the servo drive motor two rotates. The drive gear drives the driven gear ring for transmission. The driven gear ring drives the support ring and the steel strip unwinding mechanism to rotate, so that the stainless steel is spirally wound on the outside of the carbon steel bar. Then, it is electromagnetically heated inside the electromagnetic heating component. The protective gas is connected to the external protective gas connection pipe. The airflow is introduced into the gas outlet pipe through the protective gas connection pipe and sprayed on the outside of the steel body through the gas outlet hole to cool down. The temperature is reduced and finally cooled to room temperature in the furnace for post-processing. The overall efficiency is high, the bonding interface between the stainless steel strip and the carbon steel is tight, and the structural bonding is promoted to be tight at the micro level. The interface forms a continuous metallurgical transition layer with high bonding strength and maintains excellent anti-corrosion performance, which fully meets the core requirements of bimetallic screws. 2. As the plastic support tube rotates, the mounting ring and the grinding steel wire bundle rotate, and the grinding steel wire bundle is ground on the inside of the stainless steel strip. At this time, the opposite sides of the stainless steel strip and the carbon steel rod are roughened microscopically, which increases the friction of the rough contact surface. Then, the wound steel body is rolled by the rolling roller group to make the stainless steel strip and the carbon steel rod come into close contact, which facilitates the subsequent electromagnetic induction heating treatment, eliminates the micro gaps at the interface, and allows the micro-level of the stainless steel strip and the carbon steel rod to form a "mutually penetrating" transition layer. The bonding strength is increased from 100-200MPa of mechanical bonding to more than 400MPa, which is close to the strength of a single material. 3. When processing is carried out inside the chamber, the smoke and dust generated by heating and the debris generated by grinding float around. They are extracted by the air pump and guided into the gas filter through the telescopic sleeve for filtration. Finally, they are discharged through the external pipe and treated by the equipment. The chamber isolates the internal and external working environments, reducing the overall impact of the operation on the outside world, thus maintaining the working environment and increasing the environmental protection effect. Attached Figure Description

[0017] Figure 1 This is a front-view stereoscopic structural diagram of the present invention.

[0018] Figure 2 This is a rear-view stereoscopic view of the structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the three-dimensional appearance structure of the screw body of the present invention.

[0020] Figure 4 This is a front sectional view of the internal structure of the present invention.

[0021] Figure 5 This is a schematic diagram of the internal structure of the present invention, viewed from the right side.

[0022] Figure 6 This is a schematic diagram of the internal structure of the present invention, viewed from the left side.

[0023] Figure 7 This is a schematic cross-sectional view of the screw body of the present invention.

[0024] Figure 8 For the present invention Figure 4 Enlarged structural diagram at point A in the middle.

[0025] Figure 9 For the present invention Figure 4 Enlarged structural diagram at point B.

[0026] Figure 10 For the present invention Figure 4 Enlarged structural diagram at point C.

[0027] Figure 11 For the present invention Figure 4 Enlarged structural diagram at point D.

[0028] In the diagram: 1. Housing; 2. Air pump; 3. External pipe; 4. Gas filter; 5. Telescopic sleeve; 6. Protective gas connection pipe; 7. Intelligent control panel; 8. Roller assembly; 9. Inspection door; 10. Dressing roller assembly; 11. Guide roller assembly; 12. Slag discharge pipe; 13. Transmission gear; 14. Drive gear; 15. Geared servo motor; 16. Insulation chamber; 17. Insulation board one; 18. Preheating extrusion die; 19. Insulation board two; 20. Electromagnetic heating assembly; 2001. Electromagnetic heating tube sleeve; 2002. Ceramic insulation layer; 21. Support frame; 22. Chain drive mechanism; 23. Servo drive motor one; 24. Servo drive... 25. Driven motor 2; 26. Driven gear ring; 27. Bearing bracket; 28. Mounting seat 1; 29. ​​Axial flow fan blade; 30. Drive gear; 31. Mounting hole 1; 32. Mounting hole 2; 33. Exhaust pipe; 3301. Exhaust hole; 34. Support bearing; 35. Steel strip unwinding mechanism; 36. Support ring; 37. Through hole; 38. Plastic support tube; 39. Mounting ring; 40. Grinding steel wire bundle; 41. Mounting bolt; 42. Grinding sleeve; 43. Mounting flange; 44. Steel wool ball; 45. Screw body; 4501. Stainless steel strip layer; 4502. Alloy steel column; 46. Cone; 47. Tapping thread; 48. Screw head. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1-11This invention provides a technical solution: a bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment, comprising a housing 1 and a screw body 45. Guide roller groups 11 are installed on the inner and outer sides of both ends of the housing 1. Several dressing roller groups 10 are movably installed inside one end of the housing 1 via bearings. Several rolling roller groups 8 are movably installed inside the middle part of the housing 1 via bearings. A support frame 21 is fixedly installed on the inner wall of the housing 1. Several support bearings 34 are sleeved on the inner side of the support frame 21. Support rings 36 are sleeved on the inner side of the support bearings 34. Driven toothed rings 25 are fixedly sleeved on the outer sides of both ends of the support rings 36. Mounting seat 27 is bolted to the outer side of the moving gear ring 25, and mounting seat 32 is bolted to the other side of the moving gear ring 25. Steel strip unwinding mechanisms 35 are rotatably mounted on the inner sides of both mounting seats 32 and 27 via bearings. A drive gear 29 meshes with the outer side of the driven gear ring 25. A servo drive motor 24 is driven to one side of the drive gear 29. Several bearing supports 26 are fixedly mounted at the bottom of the inner cavity of the housing 1. A plastic support tube 38 is movably sleeved inside the top of the bearing support 26. A chain drive mechanism 22 is driven to the outer side of one end of the plastic support tube 38. The other end of mechanism 22 is connected to a servo drive motor 23. A grinding sleeve 42 is movably inserted into the interior of one end of the molding support tube 38 via a groove. Several axial flow fan blades 28 are fixedly sleeved on the outer side of the molding support tube 38. A mounting flange 43 is fixedly installed on the outer side of the grinding sleeve 42. A steel wool ball 44 is fixedly installed on the inner side of the grinding sleeve 42. A mounting ring 39 is movably sleeved on the outer side of the other end of the molding support tube 38. A grinding steel wire bundle 40 is fixedly installed on the outer side of the mounting ring 39. Several mounting bolts 41 pass through the interior of the mounting ring 39. Two... Two heat insulation boards 19 are fixedly installed on opposite sides of each other. A number of air outlets 33 are opened on the inner side of the air outlets 33. A protective gas connection pipe 6 is connected to the top of the air outlets 33. A heat insulation chamber 16 is provided inside the end of the box 1 away from the trimming roller group 10. A heat insulation board 17 is provided on one side of the heat insulation chamber 16. A preheating extrusion mold 18 is fixedly installed on one side of the heat insulation board 17. Through holes 37 are opened inside the box 1, the heat insulation board 17 and the heat insulation board 19. An electromagnetic heating component 20 is provided inside the box 1.

[0031] A screw head 48 is fixedly installed on the top of the screw body 45, a cone 46 is fixedly installed on the bottom of the screw body 45, and several tapping threads 47 are fixedly installed on the outer side of the cone 46. The screw body 45 includes a stainless steel strip layer 4501 and an alloy steel column 4502.

[0032] The working principle of the above technical solution is as follows: In use, the carbon steel bar and stainless steel strip are first pre-treated. The surface of the carbon steel bar is first polished to remove oxide scale, and then cleaned with a cleaning agent to remove oil stains and prevent residual impurities at the interface. The stainless steel strip is annealed, held at 900℃ for 1 hour, and then air-cooled to improve plasticity and prevent brittleness during heating. The stainless steel strip is then installed at the location of the steel strip unwinding mechanism 35. The carbon steel bar is then passed through the through hole 37 and along the central axis from one end of the housing 1 to the other. The carbon steel bar is straightened by the extrusion transmission of the trimming roller group 10. Next, the carbon steel bar passes through the molding support tube 38. At this time, the servo drive motor 23 starts rotating, causing the molding support tube 38 to rotate via the chain transmission mechanism 22. The rotation of tube 38 drives the grinding sleeve 42 to rotate, grinding the outer side of the carbon steel rod through the steel wire ball 44. The steel wire ball then passes through the inner side of the plastic support tube 38 and the support ring 36. At this time, the stainless steel strip of the steel strip unwinding mechanism 35 is wound around the outer side of the carbon steel rod. The servo drive motor 24 rotates, driving the driven gear ring 25 through the drive gear 29. The driven gear ring 25 drives the support ring 36 and the steel strip unwinding mechanism 35 to rotate, thus causing the stainless steel to spirally wind around the outer side of the carbon steel rod. As the plastic support tube 38 rotates, it causes the mounting ring 39 and the grinding steel wire bundle 40 to rotate, grinding the inner side of the stainless steel strip. This roughens the micro-surface of the stainless steel strip and the carbon steel rod, increasing the rough contact surface between them. The friction force of the rolled steel strip is then applied by the rolling roller group 8 to ensure close contact between the stainless steel strip and the carbon steel bar. Then, electromagnetic heating is applied inside the electromagnetic heating assembly 20 to maintain the temperature between 1050-1150 degrees Celsius. At this time, a protective gas, such as argon, is connected to the protective gas connecting pipe 6. The gas flow is introduced through the protective gas connecting pipe 6 into the exhaust pipe 33 and then sprayed onto the outside of the steel body through the exhaust hole 3301 for cooling, reducing the temperature to 800 degrees Celsius at a cooling rate of 15-20 degrees Celsius / s. Finally, the steel body undergoes hot drawing and extrusion treatment through the preheated extrusion die 18. The preheated extrusion die 18 is made of H13 hot work die steel and preheated to a suitable temperature to avoid excessive temperature difference leading to cracking. Afterward, the steel body enters the heat preservation chamber 16 for further processing. The process involves a slow cooling treatment, firstly rapidly cooling from approximately 1050℃ to 800℃ via argon injection at a rate of 15-20℃ / s. Directional argon injection is used to avoid uneven cooling, aiming to refine the grains, improve bonding strength, and increase the hardness of the core material. Finally, slow cooling occurs within a 16-chamber furnace, reducing the temperature from 800℃ to 500℃ at a rate of 5-8℃ / s, releasing some internal stress. Finally, stress relief is achieved through tempering. The material is directly transferred to a tempering furnace at 500℃ and held at 200-250℃ for 4-6 hours. After cooling to room temperature in the furnace, post-treatment is performed. This process is highly efficient, increasing the tightness of the bonding interface between the stainless steel strip and carbon steel, and promoting a tight structural bond at the microscopic level. A continuous metallurgical transition layer is formed at the interface, resulting in high bonding strength and an internal stress relief rate ≥80%.Subsequent processing poses no risk of cracking, the outer stainless steel layer remains free from oxidation damage, maintaining excellent corrosion resistance, perfectly meeting the core requirements of bimetallic screws.

[0033] In another implementation scheme, such as Figures 1-11 As shown, the guide roller group 11 includes a transverse limiting roller and a vertical limiting roller, and a cross limiting roller group is formed on the outside of the through hole 37.

[0034] The guide roller group 11 provides stable guidance to the steel bar through the transverse limiting roller and the vertical limiting roller, reduces misalignment, and maintains a stable position outside the through hole 37, which facilitates feeding and external drawing.

[0035] In another implementation scheme, such as Figures 1-11 As shown, a vacuum pump 2 is fixedly installed on the top of the housing 1. The input end of the vacuum pump 2 is connected to a gas filter 4. The top end of the gas filter 4 is connected to a telescopic sleeve 5. The movable part of the telescopic sleeve 5 is fixedly sleeved and connected to the top of the inner cavity of the housing 1. The gas filter 4 is fixedly installed on the top of the housing 1. The output end of the vacuum pump 2 is connected to an external pipe 3.

[0036] When processing is carried out inside the chamber 1, the smoke and dust generated by heating and the debris generated by grinding float around. They are extracted by the air pump 2 and guided into the gas filter 4 through the telescopic sleeve 5 for filtration. Finally, they are discharged through the external pipe 3 and treated by the equipment to reduce the overall impact of the operation on the outside world, thereby maintaining the working environment and increasing the effectiveness of use.

[0037] In another implementation scheme, such as Figures 1-11 As shown, the rolling roller group 8 and the trimming roller group 10 both pass through the housing 1 via bearings and extend to the outside of the housing 1. A transmission gear 13 is fixedly installed on the outside of one end of the rolling roller group 8 and the trimming roller group 10. A drive gear 14 meshes with the outside of one of the transmission gears 13. A reduction servo motor 15 is connected to one side of the drive gear 14. The reduction servo motor 15 is fixedly installed on the outside of the housing 1.

[0038] The rolling roller group 8 and the trimming roller group 10 drive the drive gear 14 through the reduction servo motor 15, and drive the structure to operate through the transmission gear 13. This allows the rolling roller group 8 to straighten the steel bar and the trimming roller group 10 to extrude the composite, thereby ensuring the straightness and stability of the wire and guaranteeing the stability of the structure. This facilitates maintaining stability and ensuring straightening.

[0039] In another implementation scheme, such as Figures 1-11As shown, the driven gear ring 25 has several mounting holes 31 inside, which are evenly distributed in a circle inside the driven gear ring 25. The support frame 21 has several mounting holes 30 inside, which are evenly distributed in a circle inside the support frame 21. Mounting seat 27 and mounting seat 32 are both installed inside the mounting holes 31 by bolts. The steel strip unwinding mechanism 35 is inclined and distributed on the inner side of the support ring 36. The servo drive motor 24 is fixedly installed on the inner wall of the housing 1.

[0040] Mounting hole 2 31 provides mounting space for mounting base 1 27 and mounting base 2 32, facilitating disassembly and assembly, and allowing for the replacement of different mounting base 1 27 and mounting base 2 32 accessories to adjust the relative position and tilt angle of the steel strip unwinding mechanism 35. It also facilitates the removal and replacement of the steel strip of the steel strip unwinding mechanism 35, thus ensuring stable use. Mounting base 2 32 provides mounting space for the structure, facilitating modification and installation.

[0041] In another implementation scheme, such as Figures 1-11 As shown, the servo drive motor 23 is fixedly installed inside the housing 1 by a bracket. The mounting flange 43 is fixedly installed on the outside of the plastic support tube 38 by a flange and bolts. The outer side of one end of the grinding sleeve 42 is flared. The mounting bolt 41 is threaded through the mounting ring 39 and extends into the inside of the plastic support tube 38. The plastic support tube 38 and the support ring 36 are coaxially arranged. The end of the plastic support tube 38 away from the grinding sleeve 42 is chamfered. The axial flow fan blades 28 are evenly distributed on the outside of the plastic support tube 38. The position of the grinding steel wire bundle 40 corresponds to the position of the steel strip unwinding mechanism 35. The support frame 21 is located on the opposite side of the rolling roller group 8 and the bearing bracket 26. The plastic support tube 38 is located on the opposite side of the support ring 36 and the dressing roller group 10.

[0042] As the axial fan blade 28 rotates following the plastic support tube 38, it blows away the grinding debris, reducing the debris on the opposite sides of the stainless steel strip and steel rod. The rotation of the plastic support tube 38 drives the grinding sleeve 42 to rotate, grinding the outer side of the carbon steel rod through the steel wire ball 44. This also causes the mounting ring 39 and the grinding wire bundle 40 to rotate, grinding the inner side of the stainless steel strip. At this time, the opposite sides of the stainless steel strip and carbon steel rod are roughened microscopically, increasing the friction of the rough contact surface. The mounting bolt 41 facilitates the removal and replacement of the mounting ring 39 and the grinding wire bundle 40. The mounting flange 43 facilitates the removal and replacement of the grinding sleeve 42. The grinding sleeve 42, in conjunction with the steel wire ball 44, grinds the outer side of the steel rod and wire, facilitating external surface treatment and increasing roughness, which improves the bonding effect during subsequent heat treatment.

[0043] In another implementation scheme, such as Figures 1-11As shown, the protective gas connecting pipe 6 is fixedly inserted through the box 1 and extends to the outside of the box 1. The vent holes 3301 are evenly distributed in a circular linear pattern on the inside of the vent pipe 33. The preheating extrusion die 18 is located on the opposite side of the heat insulation board 17 and the heat insulation board 19. The heat insulation board 17 is fixedly installed inside the box 1. The position of the through hole 37 corresponds to the position of the electromagnetic heating component 20, the rolling roller group 8, the support ring 36, the molding support pipe 38 and the trimming roller group 10. The preheating extrusion die 18 is an extrusion die with a preheating function. The through hole 37 is opened through the box 1, the heat insulation board 17 and the heat insulation board 19.

[0044] The heat-insulated "stainless steel strip and carbon steel bar composite" is quickly fed into the extrusion die. The preheated extrusion die (die 18) is made of H13 hot work die steel and preheated to a suitable temperature to avoid cracking due to excessive temperature difference. Axial pressure is applied through the extrusion rod, with a pressure value of 800-1200MPa, adjusted according to the diameter. During the critical extrusion process, a "slag discharge groove" must be opened in the die to remove oxide scale and impurities from the interface. After extrusion, the diameter shrinkage rate of the composite is controlled at 5-8% to ensure sufficient interface compaction and to avoid damaging the surface of the stainless steel strip. After treatment to room temperature, the composite is subjected to a light cold drawing of 1-3% (drawing force: 50). (0-800MPa) Cold working hardens the interface transition layer to make it denser, while improving the overall strength. The bonding strength can be further increased by 5-10% after drawing. The straightness of the composite is corrected by a precision straightening machine (accuracy ±0.02mm) to avoid eccentricity in subsequent processing. The overall process adopts argon-protected heat preservation diffusion (1050-1150℃, 3-12min) → hot extrusion densification (800-1200MPa) → staged cooling (rapid → slow cooling → tempering to relieve stress) → shot blasting passivation combined with cold drawing strengthening. A corrosion-resistant coating can be applied to the final molded body to further increase acid and alkali resistance. The overall interface forms a continuous metallurgical transition layer with a bonding strength ≥500MPa and an internal stress relief rate ≥80%. There is no risk of cracking in subsequent processing. The outer stainless steel layer is free from oxidation damage and maintains excellent corrosion resistance, fully meeting the core requirements of external corrosion protection and internal toughness of bimetallic screws. Coatings include ceramic / metal-ceramic composite coatings, fluoropolymer coatings, modified polyamides, etc.

[0045] In another implementation scheme, such as Figures 1-11 As shown, the electromagnetic heating component 20 is fixedly installed inside the housing 1 by a bracket. The electromagnetic heating component 20 includes an electromagnetic heating tube sleeve 2001 and a ceramic heat insulation layer 2002. The ceramic heat insulation layer 2002 is located outside the electromagnetic heating tube sleeve 2001. The electromagnetic heating component 20 and the through hole 37 are coaxially arranged. The output end of the electromagnetic heating component 20 is located inside the air outlet pipe 33.

[0046] The electromagnetic heating sleeve 2001 heats the composite, promoting structural stability. The ceramic insulation layer 2002 reduces the impact of heat on the electromagnetic heating sleeve 2001. After heating, the heat is introduced into the inner side of the exhaust pipe 33 for gas cooling, facilitating processing. Electromagnetic induction heating treatment eliminates micro-gaps at the interface, allowing the stainless steel strip and carbon steel rod to form a "mutually penetrating" transition layer at the microscopic level. The bonding strength is increased from 100-200MPa for mechanical bonding to over 400MPa, approaching the strength of a single material.

[0047] In another implementation scheme, such as Figures 1-7 As shown, the stainless steel strip 4501 covers the outside of the alloy steel column 4502, and the tapping threads 47 are evenly distributed in a circular pattern on the outside of the cone 46. The stainless steel strip 4501 is made of stainless steel, and the alloy steel column 4502 is made of either carbon steel or alloy steel.

[0048] After processing, stainless steel strip is attached to the outside of steel wire to form a blank. Subsequent cutting, hammering, and die forming are then carried out, finally forming the screw body (45mm). The blank processed using this method is then further processed. The stainless steel materials include 304 / 316L / 2205, etc. The inner core uses carbon steel / alloy steel to ensure internal strength and performance. The stainless steel strip thickness ranges from 0.1-0.3mm, spirally wound around the core with an overlap of 15-20%, suitable for small screw production. The inner steel rod can be adjusted according to the stainless steel strip size to produce wire and rod diameters within a certain range. A special process achieves a strong bond between the steel strip and the core. The selection and combination of the two materials must ensure that the potential difference is not too large and the difference in thermal expansion coefficients does not exceed the process compatibility range.

[0049] In another implementation scheme, such as Figures 1-4 As shown, a smart control panel 7 is fixedly installed on the front of the box 1, a slag discharge pipe 12 is connected to the bottom of the box 1, an inspection door 9 is movably installed on the front of the box 1, and an inspection port adapted to the inspection door 9 is opened on the front of the box 1.

[0050] The intelligent control panel 7 is an intelligent control device with automated intelligent hardware and a built-in intelligent system. The control output terminal of the intelligent control panel 7 is connected to the input terminals of the vacuum pump 2, the geared servo motor 15, the preheated extrusion die 18, the electromagnetic heating component 20, the servo drive motor 1 23, and the servo drive motor 24 via wires. The slag discharge pipe 12 is for slag discharge, which facilitates cleaning inside and slag discharge. The inspection door 9 facilitates cleaning, maintenance, and replacement of structural components, and facilitates internal processing. There are at least two slag discharge pipes 12, which are respectively connected to one end of the box body 1 and the opposite side of the heat insulation board 2 19 and the heat insulation board 1 17 to facilitate slag discharge.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment, comprising a housing (1) and a screw body (45), characterized in that: Guide roller groups (11) are installed on the inner and outer sides of both ends of the housing (1). Several dressing roller groups (10) are movably installed inside one end of the housing (1) via bearings. Several rolling roller groups (8) are movably installed inside the middle part of the housing (1) via bearings. A support frame (21) is fixedly installed on the inner wall of the housing (1). Several support bearings (34) are sleeved on the inner side of the support frame (21). A support ring (36) is sleeved on the inner side of the support bearing (34). Driven gear rings (25) are fixedly sleeved on the outer sides of both ends of the support ring (36). A mounting seat (27) is installed on the outer side of the driven gear ring (25) via bolts. The other side of the driven gear ring (25) is... A mounting base two (32) is bolted on. Both mounting base two (32) and mounting base one (27) have steel strip unwinding mechanisms (35) mounted on their inner sides via bearings. A drive gear (29) meshes with the outer side of the driven gear ring (25). A servo drive motor two (24) is connected to one side of the drive gear (29). Several bearing supports (26) are fixedly installed at the bottom of the inner cavity of the housing (1). A plastic support tube (38) is movably sleeved inside the top of the bearing support tube (26). A chain drive mechanism (22) is connected to the outer side of one end of the plastic support tube (38). A servo drive motor one (23) is connected to the other end of the chain drive mechanism (22). The plastic support tube... A grinding sleeve (42) is movably inserted into the interior of one end of the support tube (38) via a groove. Several axial flow fan blades (28) are fixedly sleeved on the outer side of the plastic support tube (38). An installation flange (43) is fixedly installed on the outer side of the grinding sleeve (42). A steel wool ball (44) is fixedly installed on the inner side of the grinding sleeve (42). An installation ring (39) is movably sleeved on the outer side of the other end of the plastic support tube (38). A grinding steel wire bundle (40) is fixedly installed on the outer side of the installation ring (39). Several installation bolts (41) pass through the interior of the installation ring (39). Two heat insulation boards (19) are fixedly installed inside the end of the housing (1) away from the dressing roller group (10). An air outlet pipe (33) is fixedly installed on the opposite side of the second insulation board (19). Several air outlet holes (3301) are opened on the inner side of the air outlet pipe (33). A protective gas connection pipe (6) is connected to the top of the air outlet pipe (33). An insulation chamber (16) is provided inside the end of the box (1) away from the trimming roller group (10). A heat insulation board (17) is provided on one side of the heat insulation chamber (16). A preheating extrusion mold (18) is fixedly installed on one side of the heat insulation board (17). Through holes (37) are opened inside the box (1), the heat insulation board (17) and the second insulation board (19). An electromagnetic heating component (20) is provided inside the box (1). The top of the screw body (45) is fixedly installed with a screw head (48), the bottom of the screw body (45) is fixedly installed with a cone (46), and a plurality of tapping threads (47) are fixedly installed on the outer side of the cone (46). The screw body (45) includes a stainless steel strip layer (4501) and an alloy steel column (4502).

2. The bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment according to claim 1, characterized in that: The guide roller group (11) includes a transverse limiting roller and a vertical limiting roller, and a cross limiting roller group is formed on the outside of the through hole (37).

3. The bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment according to claim 1, characterized in that: A vacuum pump (2) is fixedly installed on the top of the housing (1). The input end of the vacuum pump (2) is connected to a gas filter (4). The top end of the gas filter (4) is connected to a telescopic sleeve (5). The movable part of the telescopic sleeve (5) is fixedly sleeved and connected to the top of the inner cavity of the housing (1). The gas filter (4) is fixedly installed on the top of the housing (1). The output end of the vacuum pump (2) is connected to an external pipe (3).

4. The bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment according to claim 1, characterized in that: The rolling roller group (8) and the trimming roller group (10) both pass through the housing (1) and extend to the outside of the housing (1) via bearings. A transmission gear (13) is fixedly installed on the outside of one end of the rolling roller group (8) and the trimming roller group (10). A drive gear (14) meshes with the outside of one of the transmission gears (13). A reduction servo motor (15) is connected to one side of the drive gear (14). The reduction servo motor (15) is fixedly installed on the outside of the housing (1).

5. The bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment according to claim 1, characterized in that: The driven gear ring (25) has several mounting holes 2 (31) inside, which are evenly distributed in a circle inside the driven gear ring (25). The support frame (21) has several mounting holes 1 (30) inside, which are evenly distributed in a circle inside the support frame (21). The mounting seat 1 (27) and mounting seat 2 (32) are both installed in the mounting holes 2 (31) by bolts. The steel strip unwinding mechanism (35) is distributed in an inclined manner on the inner side of the support ring (36). The servo drive motor 2 (24) is fixedly installed on the inner wall of the housing (1).

6. The bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment according to claim 1, characterized in that: The servo drive motor (23) is fixedly installed inside the housing (1) by a bracket. The mounting flange (43) is fixedly installed on the outside of the plastic support tube (38) by a flange and bolts. The outer side of one end of the grinding sleeve (42) is flared. The mounting bolt (41) is threaded through the mounting ring (39) and extends into the inside of the plastic support tube (38). The plastic support tube (38) and the support ring (36) are coaxially arranged. The end of the plastic support tube (38) away from the grinding sleeve (42) is chamfered. The axial flow fan blades (28) are evenly distributed on the outside of the plastic support tube (38). The position of the grinding steel wire bundle (40) corresponds to the position of the steel strip unwinding mechanism (35). The support frame (21) is located on the opposite side of the rolling roller group (8) and the bearing bracket (26). The plastic support tube (38) is located on the opposite side of the support ring (36) and the dressing roller group (10).

7. The bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment according to claim 1, characterized in that: The protective gas connecting pipe (6) is fixedly inserted through the box body (1) and extends to the outside of the box body (1). The air outlet (3301) is evenly distributed in a circular linear pattern on the inside of the air outlet pipe (33). The preheating extrusion mold (18) is located on the opposite side of the heat insulation board one (17) and the heat insulation board two (19). The heat insulation board one (17) is fixedly installed inside the box body (1). The position of the through hole (37) corresponds to the position of the electromagnetic heating component (20), the rolling roller group (8), the support ring (36), the plastic support pipe (38), and the trimming roller group (10). The preheating extrusion mold (18) is an extrusion mold with a preheating function. The through hole (37) is opened through the inside of the box body (1), the heat insulation board one (17), and the heat insulation board two (19).

8. The bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment according to claim 1, characterized in that: The electromagnetic heating assembly (20) is fixedly installed inside the housing (1) by a bracket. The electromagnetic heating assembly (20) includes an electromagnetic heating tube sleeve (2001) and a ceramic heat insulation layer (2002). The ceramic heat insulation layer (2002) is located outside the electromagnetic heating tube sleeve (2001). The electromagnetic heating assembly (20) and the through hole (37) are coaxially arranged. The output end of the electromagnetic heating assembly (20) is located inside the air outlet pipe (33).

9. The bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment according to claim 1, characterized in that: The stainless steel strip (4501) covers the outside of the alloy steel column (4502), and the tapping threads (47) are evenly distributed in a circular pattern on the outside of the cone (46). The stainless steel strip (4501) is made of stainless steel, and the alloy steel column (4502) is made of either carbon steel or alloy steel.

10. The bimetallic stainless steel acid and alkali resistant anti-corrosion screw and its production equipment according to claim 1, characterized in that: The front of the box (1) is fixedly equipped with a smart control panel (7), the bottom of the box (1) is connected to a slag discharge pipe (12), the front of the box (1) is movably equipped with a maintenance door (9), and the front of the box (1) is provided with a maintenance port that is compatible with the maintenance door (9).

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