阅读说明：本技术 一种进行风机叶轮表面耐磨强化的工艺流程 (Process flow for enhancing wear resistance of surface of fan impeller ) 是由 胡雪 陈育龙 张立新 张胜利 董峰 史雪宾 郑雄飞 买春亮 于 2021-09-18 设计创作，主要内容包括：本发明涉及一种进行风机叶轮表面耐磨强化的工艺流程,包括以下步骤：S1：前期准备,清除杂质并且确定磨损部位以及磨损量；S2：打磨清理,打磨损伤部位以出现新的加工面；S3：焊前局部预热,以减小焊接接头的冷却速度；S4：打底处理,使用镍基合金焊条打底,以降低焊接应力；S5：堆焊,使用二氧化碳半自动气体保护焊进行堆焊；S6：去应力热处理,去除残余应力；S7：靠模处理,制作靠模并将堆焊处理后的地方进行研磨处理；S8：无损探伤,检查是否存在缺陷；S9：动平衡检测,进行动平衡检测以及校正,确保风机达到使用要求。使用此工艺流程进行的风机叶轮表面耐磨强处理,焊接层结合强度高,可以有效地解决风机叶轮的磨损问题,提高使用寿命。(The invention relates to a process flow for enhancing the wear resistance of the surface of a fan impeller, which comprises the following steps: s1: early preparation, removing impurities and determining a wear part and a wear amount; s2: polishing and cleaning, and polishing the damaged part to form a new processing surface; s3: locally preheating before welding to reduce the cooling speed of the welding joint; s4: priming treatment, namely priming by using a nickel-based alloy welding rod to reduce welding stress; s5: overlaying, namely overlaying by using carbon dioxide semi-automatic gas shielded welding; s6: stress removing heat treatment to remove residual stress; s7: profiling, namely manufacturing a profile and grinding the position subjected to surfacing welding; s8: nondestructive inspection, and whether defects exist is checked; s9: and dynamic balance detection, namely performing dynamic balance detection and correction to ensure that the fan meets the use requirement. The surface of the fan impeller is subjected to wear-resistant strong treatment by using the process flow, the bonding strength of a welding layer is high, the problem of wear of the fan impeller can be effectively solved, and the service life is prolonged.)

1. A process flow for wear resistance strengthening of the surface of a fan impeller is characterized by comprising the following steps: the method comprises the following steps:

s1: early preparation, namely removing impurities on the surface of a fan impeller, and simultaneously carrying out all-dimensional inspection to determine the abrasion part and the abrasion amount of the impeller;

s2: polishing and cleaning, and removing a fatigue layer of the damaged part until a new machined surface appears;

s3: the local preheating before welding reduces the cooling speed of a welding joint, avoids the generation of a hardening structure, reduces the welding stress and deformation, prevents the generation of welding cracks, and can remove factors such as moisture, oil stains and the like which are not beneficial to the welding quality;

s4: priming treatment, namely priming by using a low-stress nickel-based alloy welding rod, reducing the welding stress between a surfacing layer and a fan impeller and preventing welding cracks;

s5: performing surfacing, namely performing surfacing by using a wear-resistant surfacing flux-cored wire and adopting carbon dioxide semi-automatic gas shielded welding, wherein hammering, heat preservation and other operations are required while surfacing, so that the aim of eliminating welding stress is fulfilled;

s6: stress relief heat treatment, namely removing residual stress by adopting high-temperature tempering;

s7: profiling, namely manufacturing a profile according to the fan impellers with the same shape and size, grinding the position subjected to surfacing welding treatment, and stopping repairing after the combination degree reaches 80%;

s8: nondestructive inspection, namely performing nondestructive inspection technologies such as appearance, ultrasonic inspection, magnetic powder inspection and the like on the repaired fan impeller to check whether defects exist or not and ensure that the repaired quality meets the use requirements;

s9: and dynamic balance detection, namely performing dynamic balance detection and correction to ensure that the fan meets the use requirement.

2. The process flow for wear enhancement of the surface of a fan impeller according to claim 1, wherein: in the S4 backing treatment, the backing welding rod is made of low-stress nickel-based alloy welding rods such as xupper 2220, 2222m, xupper nuclear otec 2222 and the like, and manual arc welding is used and two times of operation are carried out, so that the welding thickness is 5.5 +/-0.5 mm.

3. The process flow for wear enhancement of the surface of a fan impeller according to claim 1, wherein: in the S5 surfacing, high-hardness surfacing flux-cored wires such as YD988, YD397-1 and LQ707 are selected as surfacing welding wires, when the carbon dioxide semi-automatic gas shielded welding operation is carried out, short-arc short-weld bead micro-swing and low-heat input method is adopted for welding, meanwhile, high-frequency mechanical vibration equipment is adopted to process the welding seam in time during welding, and the welding stress is controlled below 95 MPa.

4. The process flow for wear enhancement of the surface of a fan impeller according to claim 1, wherein: in the S6 stress-relief heat treatment, the repaired fan impeller is placed in a heating furnace for integral heating treatment at the temperature of 500-600 ℃, the temperature is kept for 2.5-3 hours, and the temperature of the furnace entering and exiting is below 250 ℃.

Technical Field

The invention relates to the field of fan impeller surface strengthening, in particular to a process flow for strengthening the wear resistance of the fan impeller surface.

Background

The fan is a machine which depends on input mechanical energy, converts the mechanical energy into air potential energy and air kinetic energy, is used for improving gas pressure and conveying gas, and is a universal driven fluid machine. Because of the influence of the operating environment, the centrifugal fan usually deviates from the design working condition to operate, and the impact abrasion of the generated solid dust particles on the fan impeller blade is more serious. Although the abrasion protective layer is generally designed in advance at the abrasion bearing point of the impeller, under the working condition of high dust content, gas-solid two-phase alternate flow still causes the impeller to be abraded and aggravated, so that the vibration of a fan is large, the noise is aggravated, the conveying efficiency is reduced, and even the problems of casing wear, structural unbalance, serious air leakage and the like are solved. The resulting downtime is frequent, maintenance costs increase, and production losses are large. Therefore, the wear failure of the impeller of the centrifugal fan is an important reason for the damage of the fan, so that the wear resistance of the impeller of the fan is improved, the wear resistance of the material of the impeller is improved, the wear failure of the impeller is prevented or slowed down, and the wear failure of the impeller is a key technology for prolonging the service life of the fan and developing the impeller.

Disclosure of Invention

The invention aims to provide a process flow for enhancing the wear resistance of the surface of a fan impeller, which solves the problems in the background art.

In order to solve the technical problems, the invention provides the following technical scheme: a process flow for carrying out wear resistance strengthening on the surface of a fan impeller comprises the following steps:

s1: early preparation, namely removing impurities on the surface of a fan impeller, and simultaneously carrying out all-dimensional inspection to determine the abrasion part and the abrasion amount of the impeller;

s2: polishing and cleaning, and removing a fatigue layer of the damaged part until a new machined surface appears;

s3: the local preheating before welding reduces the cooling speed of a welding joint, avoids the generation of a hardening structure, reduces the welding stress and deformation, prevents the generation of welding cracks, and can remove factors such as moisture, oil stains and the like which are not beneficial to the welding quality;

s4: priming treatment, namely priming by using a low-stress nickel-based alloy welding rod, reducing the welding stress between a surfacing layer and a fan impeller and preventing welding cracks;

s5: performing surfacing, namely performing surfacing by using a wear-resistant surfacing flux-cored wire and adopting carbon dioxide semi-automatic gas shielded welding, wherein hammering, heat preservation and other operations are required while surfacing, so that the aim of eliminating welding stress is fulfilled;

s6: stress relief heat treatment, namely removing residual stress by adopting high-temperature tempering;

s7: profiling, namely manufacturing a profile according to the fan impellers with the same shape and size, grinding the position subjected to surfacing welding treatment, and stopping repairing after the combination degree reaches 80%;

s8: nondestructive inspection, namely performing nondestructive inspection technologies such as appearance, ultrasonic inspection, magnetic powder inspection and the like on the repaired fan impeller to check whether defects exist or not and ensure that the repaired quality meets the use requirements;

s9: and dynamic balance detection, namely performing dynamic balance detection and correction to ensure that the fan meets the use requirement.

The process flow for enhancing the wear resistance of the surface of the fan impeller is characterized by comprising the following steps: in the S4 backing treatment, the backing welding rod is made of low-stress nickel-based alloy welding rods such as xupper 2220, 2222m, xupper nuclear otec 2222 and the like, and manual arc welding is used and two times of operation are carried out, so that the welding thickness is 5.5 +/-0.5 mm.

Through above-mentioned technical scheme, can make the surfacing layer obtain good composition, the amount of fusion of base metal to the welding seam effectively reduces, has reduced the dilution rate of base metal promptly, can reduce the welding stress between surfacing layer and the fan wheel simultaneously, prevents to produce welding crack.

The process flow for enhancing the wear resistance of the surface of the fan impeller is characterized by comprising the following steps: in the S5 surfacing, high-hardness surfacing flux-cored wires such as YD988, YD397-1 and LQ707 are selected as surfacing welding wires, when the carbon dioxide semi-automatic gas shielded welding operation is carried out, short-arc short-weld bead micro-swing and low-heat input method is adopted for welding, meanwhile, high-frequency mechanical vibration equipment is adopted to process the welding seam in time during welding, and the welding stress is controlled below 95 MPa.

Through the technical scheme, the wear-resistant layer after welding is metallurgical bonding with strong bonding force, the bonding strength is high, and meanwhile, the welding stress is far lower than the yield strength of the base metal, so that the impeller is guaranteed not to deform due to the welding stress.

The process flow for enhancing the wear resistance of the surface of the fan impeller is characterized by comprising the following steps: in the S6 stress-relief heat treatment, the repaired fan impeller is placed in a heating furnace for integral heating treatment at the temperature of 500-600 ℃, the temperature is kept for 2.5-3 hours, and the temperature of the furnace entering and exiting is below 250 ℃.

Through the technical scheme, the residual stress can be eliminated, the shape and the size of the fan impeller are stabilized, the plasticity of weld metal is improved, the hardness of a heat affected zone is reduced, the fracture toughness is improved, and the fatigue strength is improved.

Drawings

FIG. 1 is a schematic flow diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, a process flow for wear resistance strengthening of the surface of a fan impeller comprises the following steps:

s1: early preparation, namely removing impurities on the surface of a fan impeller, and simultaneously carrying out all-dimensional inspection to determine the abrasion part and the abrasion amount of the impeller;

s2: polishing and cleaning, and removing a fatigue layer of the damaged part until a new machined surface appears;

s3: the local preheating before welding reduces the cooling speed of a welding joint, avoids the generation of a hardening structure, reduces the welding stress and deformation, prevents the generation of welding cracks, and can remove factors such as moisture, oil stains and the like which are not beneficial to the welding quality;

s4: priming treatment, namely priming by using a low-stress nickel-based alloy welding rod, reducing the welding stress between a surfacing layer and a fan impeller and preventing welding cracks;

s5: performing surfacing, namely performing surfacing by using a wear-resistant surfacing flux-cored wire and adopting carbon dioxide semi-automatic gas shielded welding, wherein hammering, heat preservation and other operations are required while surfacing, so that the aim of eliminating welding stress is fulfilled;

s6: stress relief heat treatment, namely removing residual stress by adopting high-temperature tempering;

s7: profiling, namely manufacturing a profile according to the fan impellers with the same shape and size, grinding the position subjected to surfacing welding treatment, and stopping repairing after the combination degree reaches 80%;

s8: nondestructive inspection, namely performing nondestructive inspection technologies such as appearance, ultrasonic inspection, magnetic powder inspection and the like on the repaired fan impeller to check whether defects exist or not and ensure that the repaired quality meets the use requirements;

s9: and dynamic balance detection, namely performing dynamic balance detection and correction to ensure that the fan meets the use requirement.

The process flow for enhancing the wear resistance of the surface of the fan impeller is characterized by comprising the following steps: in the S4 backing treatment, the backing welding rod is made of low-stress nickel-based alloy welding rods such as xupper 2220, 2222m, xupper nuclear otec 2222 and the like, and manual arc welding is used and two times of operation are carried out, so that the welding thickness is 5.5 +/-0.5 mm.

Through above-mentioned technical scheme, can make the surfacing layer obtain good composition, the amount of fusion of base metal to the welding seam effectively reduces, has reduced the dilution rate of base metal promptly, can reduce the welding stress between surfacing layer and the fan wheel simultaneously, prevents to produce welding crack.

The process flow for enhancing the wear resistance of the surface of the fan impeller is characterized by comprising the following steps: in the S5 surfacing, high-hardness surfacing flux-cored wires such as YD988, YD397-1 and LQ707 are selected as surfacing welding wires, when the carbon dioxide semi-automatic gas shielded welding operation is carried out, short-arc short-weld bead micro-swing and low-heat input method is adopted for welding, meanwhile, high-frequency mechanical vibration equipment is adopted to process the welding seam in time during welding, and the welding stress is controlled below 95 MPa.

Through the technical scheme, the wear-resistant layer after welding is metallurgical bonding with strong bonding force, the bonding strength is high, and meanwhile, the welding stress is far lower than the yield strength of the base metal, so that the impeller is guaranteed not to deform due to the welding stress.

The process flow for enhancing the wear resistance of the surface of the fan impeller is characterized by comprising the following steps: in the S6 stress-relief heat treatment, the repaired fan impeller is placed in a heating furnace for integral heating treatment at the temperature of 500-600 ℃, the temperature is kept for 2.5-3 hours, and the temperature of the furnace entering and exiting is below 250 ℃.

Through the technical scheme, the residual stress can be eliminated, the shape and the size of the fan impeller are stabilized, the plasticity of weld metal is improved, the hardness of a heat affected zone is reduced, the fracture toughness is improved, and the fatigue strength is improved.