阅读说明：本技术 一种定域修复压力机轴瓦磨损的设备和方法 (Equipment and method for locally repairing abrasion of press bearing bush ) 是由 范晖 赵阳培 肖成西 王善奎 郭华锋 于 2019-09-10 设计创作，主要内容包括：本发明公开了一种定域修复压力机轴瓦磨损的设备和方法,包括输液管道、电解液罐、电解液泵、流速控制阀、电源、数控喷嘴系统、轴瓦工件装夹模块组成,电解液泵启动后,电解液束流经喷嘴射向工件形成一闭合回路,构成电化学加工的必要加工条件,电解液罐、电解液泵及电解液回收盘分为A、B两套,供不同成分的修复用电解液循环使用,电解液中添加的二硫化钼润滑封装式复合涂层在射流态加工环境下,可以有效发挥修复沉积层的耐磨性能得到有效提升,在受损零件尺寸得以恢复的同时性能不仅恢复甚至得到提升,达到了形性协同加工制造的技术效果。(the invention discloses equipment and a method for locally repairing the abrasion of a press bearing bush, which comprise a liquid conveying pipeline, an electrolyte tank, an electrolyte pump, a flow rate control valve, a power supply, a numerical control nozzle system and a bearing bush workpiece clamping module, wherein after the electrolyte pump is started, an electrolyte beam flows through a nozzle and is emitted to a workpiece to form a closed loop to form necessary machining conditions for electrochemical machining, the electrolyte tank, the electrolyte pump and an electrolyte recovery disc are divided into A, B sets, so that electrolyte for repairing different components can be recycled, a molybdenum disulfide lubrication packaging type composite coating added in the electrolyte can effectively play a role in effectively improving the wear resistance of a repaired deposition layer under a jet state machining environment, the performance is not only recovered but also improved when the size of a damaged part is recovered, and the technical effect of shape collaborative machining and manufacturing is achieved.)

1. The utility model provides an equipment of localized repair press axle bush wearing and tearing which characterized in that:

Comprises a liquid conveying pipeline, an electrolyte tank, an electrolyte pump, a flow rate control valve, a power supply, a numerical control nozzle system and a bearing bush workpiece clamping module,

The electrolyte tank, the electrolyte pump, the flow rate control valve, the nozzle system and the workpiece to be repaired are sequentially connected through parts of the infusion pipeline, the anode of the power supply is connected with the anode rod of the nozzle, the cathode of the power supply is connected with the workpiece to be repaired, after the electrolyte pump is started, electrolyte beams flow through the nozzle and are emitted to the workpiece to form a closed loop to form necessary processing conditions for electrochemical processing, and the electrolyte tank, the electrolyte pump and the electrolyte recovery disc are divided into A, B sets for recycling electrolyte for repairing with different components.

2. The apparatus for localized repair of press bearing wear according to claim 1, wherein: the bearing bush workpiece clamping module consists of a chuck type workpiece clamp and a numerical control clamping platform, wherein the clamp is a U-shaped groove fixing clamp, two sliding grooves are respectively formed in two inner sides of the upper end of the U-shaped groove fixing clamp, the sliding grooves and the top surface of the U-shaped groove fixing clamp are on the same horizontal plane, a sliding groove block is arranged in each sliding groove, the sliding groove blocks can be fixed in the sliding grooves through fastening bolts, a fixing tightening device is fixed on each of the two upper end surfaces of the U-shaped groove fixing clamp and consists of bolts and a cushion block, waist-shaped long holes are formed in the cushion block, a forging press bearing bush needing to be repaired is placed in a semicircular groove of the clamp, and the forging press bearing bush moves towards the center and is tightly attached to the surface of the U-shaped groove by tightening the bolts on the left side and the right side and utilizing the gap of the sliding groove; when two ends of the forging press bearing bush protrude out of two upper end surfaces of the semicircular groove, the pressing block can press two ends of the bearing bush by adjusting the position of the bolt in the waist-shaped hole, the bolt is tightened to fix the forging press bearing bush in the special fixture, the recovery disc is placed below the workpiece to be repaired, electrolyte sprayed onto the surface of the workpiece can be collected, and the electrolyte is collected through the return pipe and flows back to the electrolyte tank.

3. the apparatus for localized repair of press bearing wear according to claim 1, wherein: the electrolyte for repairing is divided into two tanks AB: the electrolyte in the electrolyte tank A comprises the following components: 250 g/L of blue vitriol, 50 g/L of concentrated sulfuric acid, 10 g/L of lauryl sodium sulfate and 20 g/L of superfine molybdenum disulfide powder as surfactant; the electrolyte in the electrolyte tank B comprises the following components: 250 g/L of blue vitriol and 50 g/L of concentrated sulfuric acid, and the superfine molybdenum disulfide powder used in the tank A is pretreated before the repair electrodeposition: washing → dilute nitric acid washing → distilled water washing → drying, the temperature of the electrolyte is controlled at 50 +/-2 ℃ by a thermostatic water bath, and mechanical stirring is carried out at the speed of 1000 rpm, so as to avoid powder agglomeration.

4. A method for repairing the abrasion of a press bearing bush in a localized way,

pretreating the worn part of the inner surface of the bearing bush to be repaired: cleaning the spiral tooth surface and tooth root of the ultra-large copper nut by using gasoline to remove oil stains; gradually grinding and polishing by using 800-1200 mesh metallographic abrasive paper; thirdly, cleaning the polished material by using 35 g/L of sodium hydroxide solution, degreasing and removing oil on the surface: then, activating by using 10% concentrated sulfuric acid and 10% nitric acid mixed acid; fourthly, the distilled water is washed cleanly and dried,

evaluating according to the wear degree of the bearing bush, selecting the caliber of the nozzle in a given nozzle selection range, repairing the worn point of the bearing bush by adopting a circular nozzle, and if the area is smaller, adopting a fixed-point scanning mode, and if the area is larger, adopting a filling type scanning path to repair a controllable nozzle system; the small scratches are also suitable for adopting a round nozzle; the wider belt-shaped wear is preferably a rectangular nozzle;

the repairing thickness is 100-1000 microns, the number of scanning layers at the worn part is selected within the range of 4-8 layers, each layer is divided into two procedures of a bottom coating layer and a lubricant layer, and the specific process is as follows: firstly, a tank B of electrolyte is selected, the distance between a nozzle and a workpiece is kept at 10mm, the reciprocating scanning is carried out on the surface of a base body by combining technological parameters of direct current 0.5A, the scanning speed is 300mm/min and the jet flow speed is 150L/h, the number of layers is controlled to be 25, the process is a bottoming process, namely, a nanocrystalline coating with better surface appearance and flatness is preset on the surface of the base body and the surface of the next lubricating layer, and the preparation is carried out for the next lubricating layer; secondly, selecting an A tank electrolyte, keeping the distance between a nozzle and a workpiece to be 5mm, combining technological parameters of pulse current, scanning speed of 50 mm/min and jet flow rate of 100L/h on the surface of a substrate to perform reciprocating scanning, controlling the number of layers to be 400, adopting pulse current, controlling the current frequency to be 5000Hz, the current density to be 400A/dm2, the flow rate of working solution to be 200L/h and the duty ratio to be 1:7,

before the repair is started, a nozzle is positioned at the worn part of the inner surface of the bearing bush by a mechanical arm, the whole processing process and a numerical control mechanical device are set by a computer set numerical control program, the program comprises the settings of scanning times, scanning distance, working start-stop frequency of the injection action and the like, the information is adjusted according to the actual processing requirement to obtain the optimal effect, the injection scanning processing path and the scanning layer number are selected and optimized, so that the solid lubricating layer is accurately accumulated in the damaged area of the inner surface of the bearing bush according to the specified position and thickness to form an effective repairable antifriction lubricating coating,

And (3) detecting the repairing effect, namely completing the surface repairing of the bearing bush in cooperation with the effect detection, measuring the gap between the bearing bush and the shaft by the ruler after a set certain repairing unit is finished, and continuing to perform deposition repairing on a new repairing unit until the deposition thickness is reached if the specified thickness is not reached.

Technical Field

The invention particularly relates to equipment and a method for locally repairing the abrasion of a press bearing bush.

background

the press machine is a production machine for processing metal into parts by applying strong pressure to a metal blank to enable the metal to generate plastic deformation and fracture, can be widely applied to processes of cutting, punching, blanking, bending, riveting, forming and the like, and has wide application in the high-end equipment manufacturing industry. The bearing bush is an important part in the press. The bearing bush has the advantages that the bearing bush is lubricated through the oil grooves on the friction surface of the bearing bush, the supporting effect similar to that of a ball bearing is achieved, the abrasion of matched shaft parts is reduced, and therefore the shaft parts are well protected. However, after a certain working time, the bearing bush is subjected to a large impact and a large vibration load in use, impurities or abnormal viscosity exist in lubricating oil, or the bearing bush is worn or burned due to the limited property of a manufacturing material and the limited bearing capacity for extreme working conditions, and the like, so that the product quality is affected and a great potential safety hazard exists after the bearing bush is continuously used.

After research and development of large equipment manufacturing enterprises such as Xuzhou forging and pressing machine tool factory group Limited, the abrasion phenomenon of friction auxiliary parts such as a connecting rod and a bearing bush mechanism of a high-speed press is found to appear as follows: 1. bear relatively extreme working load; 2. pitting and burning are very common in failure forms. The damage amount is not more than tens of microns to hundreds of microns, but the damage is serious; and 3, considering that the meshing is soft, the embedding property and the compliance are favorable for journal running, and the bearings, the nuts and the like in the friction pair are mainly made of non-ferrous alloy materials, including tin-phosphor bronze, copper-lead alloy, beryllium copper and the like. As shown in the attached figure 1, the on-site picture of a large bearing bush of a high-speed press is made of tin bronze alloy, and the inner diameter of the bearing bush is about 300-500 mm. The most immediate maintenance method for damage to such components is typically replacement. However, the new product is basically expensive, and the unit price generally exceeds 3 ten thousand yuan. And the supply period is long, if spare parts are in short supply, the spare parts cannot be replaced immediately, and the production is delayed. The large copper bearing bush component is very common and important in national economy, such as a large numerical control machine tool, power generation equipment and mining equipment, can realize on-site and even on-line quick repair or reinforcement, and has extremely important strategic significance for promoting economic benefit, improving equipment perfectness, realizing sustainable development and practicing green manufacturing advocated by the nation.

At present, the bearing bush is repaired by a plurality of means, the traditional repair process of the babbitt metal bearing bush adopts a casting method and an oxy-acetylene welding method, the two methods have complex processes, extremely high requirements on the level of operators, a large amount of subsequent mechanical processing is needed, the material loss is large, a large amount of volatile metal gas is harmful to human bodies, and the health of the human bodies is influenced after long-time work. In addition, the bearing bush can be repaired by means of the current advanced high-energy field surface forming technology, such as laser cladding, plasma cladding, welding, thermal spraying and the like. Although the method has the advantages of high repair speed, high efficiency, adjustable alloy components and the like, the method also has the problems of complex equipment, high relative cost, difficulty in controlling repair thickness, heat-affected residual stress in a repair area and the like. In fact, it is more desirable for the parts to be repaired, which are hard materials with high melting point and large damage (volume damage), but may not be fully suitable for the friction pair with relatively soft material (such as copper parts) and small damage (surface damage). If the repair cost is too high and even exceeds the value of replacing a new product, the meaning of energy conservation and consumption reduction is lost. For another example, patent 201210498063.5 discloses a method for preparing a solid lubricant coating on a copper-based bearing shell, which is applied to the surface of the copper-based bearing shell by a spray gun to form a cured coating, and the method is simple, does not require a high energy field, and requires subsequent treatments, such as surface drying and curing at a high temperature of 280 ℃. Therefore, in the field of repairing bearing bushes, there is a need for a repair method that is light, simple and easy to control.

in fact, the electrodeposition technology used as a low-cost coating method has the advantages of good adaptability, relatively simple process, convenient operation, no heat affected zone and the like, and the prepared special coating has good antifriction performance and heat-resistant and corrosion-resistant characteristics. However, the common electrodeposition deposition speed is slow, the efficiency is low, and when the repair tool is used, the part to be repaired can be processed only by immersing the part in the electrolytic bath, and the damaged part cannot be processed in a targeted manner. The invention provides equipment and an operation method for preparing a repairing layer by a jet flow electrodeposition method aiming at the abrasion condition of a large bearing bush based on a particle jet flow electrodeposition processing technology, achieves the purposes of size recovery and performance improvement, and has important significance for remanufacturing precious damaged parts.

Disclosure of Invention

The invention aims to provide equipment and a method for locally repairing the abrasion of a bearing bush of a press machine, so as to solve the problems in the background technology.

in order to achieve the purpose, the invention provides the following technical scheme: an apparatus for localized repair of press bearing bush abrasion comprises a liquid conveying pipeline, an electrolyte tank, an electrolyte pump, a flow rate control valve, a power supply, a numerical control nozzle system and a bearing bush workpiece clamping module,

the electrolyte tank, the electrolyte pump, the flow rate control valve, the nozzle system and the workpiece to be repaired are sequentially connected through all parts of the infusion pipeline, the anode of the power supply is connected with the anode rod of the nozzle, and the cathode of the power supply is connected with the workpiece to be repaired. After the electrolyte pump is started, the electrolyte flow is jetted to the workpiece (cathode) through the nozzle to form a closed loop, which forms the necessary processing condition of electrochemical processing, and the electrolyte tank, the electrolyte pump and the electrolyte recovery disc are divided into A, B sets for recycling electrolyte for repairing with different components.

The bearing bush workpiece clamping module consists of a chuck type workpiece clamp and a numerical control clamping platform. The fixture is characterized in that two inner sides of the upper end of the U-shaped groove fixing clamp are provided with a sliding groove, the sliding groove and the top surface of the U-shaped groove fixing clamp are on the same horizontal plane, a sliding groove block is placed in each sliding groove, and the sliding groove blocks can be fixed in the sliding grooves through fastening bolts. The two upper end faces of the U-shaped groove fixing clamp are respectively fixed with a fixing and clamping device which consists of a bolt and a cushion block, and the cushion blocks are respectively provided with a waist-shaped long hole. The forging press bearing bush needing repairing is placed in the semicircular groove of the clamp, bolts on the left side and the right side are tightened, and the forging press bearing bush moves towards the center to be tightly attached to the surface of the U-shaped groove by utilizing the gap of the sliding groove block in the sliding groove. When the two ends of the bearing bush of the forging press protrude out of the two upper end surfaces of the semicircular groove, the pressing blocks can press the two ends of the bearing bush by adjusting the position of the bolt in the waist-shaped hole, and the bolt is tightened to fix the bearing bush of the forging press in the special fixture. A recovery disc is arranged below the workpiece to be repaired, and can collect the electrolyte sprayed onto the surface of the workpiece and flowing back to the electrolyte tank through a return pipe.

The electrolyte for repairing is divided into two tanks AB: the electrolyte in the electrolyte tank A comprises the following components: 250 g/L of blue vitriol, 50 g/L of concentrated sulphuric acid, 10 g/L of sodium dodecyl sulfate as surfactant and 20 g/L of superfine molybdenum disulfide powder (with the grain diameter of 10 microns). The electrolyte in the electrolyte tank B comprises the following components: 250 g/L of blue vitriol and 50 g/L of concentrated sulfuric acid. Before repairing the electrodeposition, the superfine molybdenum disulfide powder used in the tank A is subjected to pretreatment: water washing → dilute nitric acid washing → distilled water washing → drying. The temperature of the electrolyte is controlled to be 50 +/-2 ℃ by a constant-temperature water bath, and mechanical stirring is carried out at the speed of 1000 revolutions per minute, so that powder agglomeration is avoided.

A method for repairing the abrasion of a press bearing bush in a localized way,

Pretreating the worn part of the inner surface of the bearing bush to be repaired: cleaning the spiral tooth surface and tooth root of the ultra-large copper nut by using gasoline to remove oil stains; gradually grinding and polishing by using 800-1200 mesh metallographic abrasive paper; thirdly, cleaning the polished material by using 35 g/L of sodium hydroxide solution, degreasing and removing oil on the surface: then, activating by using 10% concentrated sulfuric acid and 10% nitric acid mixed acid; fourthly, the mixture is washed clean by distilled water and dried.

And (4) evaluating according to the wear degree of the bearing bush, and selecting the caliber of the nozzle within a given nozzle selection range. The point-shaped worn bearing bush is preferably repaired by a circular nozzle. If the area is small, a fixed-point scanning mode can be adopted, and if the area is large, the nozzle system can be controlled to be repaired by adopting a filling type scanning path; the small scratches are also suitable for adopting a round nozzle; the wider band-shaped wear is preferably achieved with a rectangular nozzle.

The repair thickness is between 100 and 1000 microns, and the number of scanning layers at the worn part is selected within the range of 4-8 layers. Each layer is divided into two working procedures of a bottom layer and a lubricant layer. The specific process is as follows: firstly, a tank B of electrolyte is selected, the distance between a nozzle and a workpiece is kept at 10mm, the reciprocating scanning is carried out on the surface of a base body by combining the technological parameters of direct current (0.5A), the scanning speed is 300mm/min and the jet flow speed is 150L/h, the number of layers is controlled to be 25, the process is a bottoming process, namely, a nanocrystalline coating with better surface appearance and flatness is preset on the surface of the base body and the surface of the next layer of lubricating layer, and the preparation is carried out for the lubricating layer arranged in the next step; secondly, an A tank electrolyte is selected, the distance between the nozzle and the workpiece is kept to be 5mm, the reciprocating scanning is carried out on the surface of the substrate by combining the technological parameters of pulse current (current 0.4A, pulse frequency 5000Hz, duty ratio 1:7), scanning speed of 50 mm/min and jet flow speed of 100L/h, and the number of layers is controlled to be 400. Pulse current is adopted, the current frequency is 5000Hz, the current density is 400A/dm2, the flow rate of the working fluid is 200L/h, and the duty ratio is 1: 7. 8) Before repair, the nozzle is positioned to the worn part of the inner surface of the bearing bush by a manipulator. The whole machining process and the numerical control mechanical device are set by a computer-set numerical control program. The program includes the settings of scanning times, scanning distance, the working start-stop frequency of the injection action and the like, the information is adjusted according to the actual processing requirements to obtain the optimal effect, and the processing path of the injection scanning and the number of the scanning layers are selected and optimized, so that the solid lubricating layer is accurately deposited in the damaged area of the inner surface of the bearing bush according to the specified position and thickness to form the effective repairable antifriction lubricating coating.

And (5) detecting the repairing effect. The surface repair of the bearing bush is completed in cooperation with the effect detection. After the set one of the repair units is finished, the gauge measures the shoe/axle gap. If the specified thickness is not reached, the deposition repair of a new repair unit can be continued until the deposition thickness is reached.

the invention has the beneficial effects that:

(1) The molybdenum disulfide lubrication packaging type composite coating added into the electrolyte can effectively exert the wear resistance of repairing the settled layer to be effectively improved under the jet flow state processing environment, the performance is not only recovered but also even improved when the size of the damaged part is recovered, and the technical effect of shape cooperative processing and manufacturing is achieved

(2) The characteristic of good localization of jet electrodeposition is utilized to introduce a linkage numerical control processing system. Through the spatial displacement of the manipulator and the workbench, the accurate repair of the nozzle to the abrasion position of the inner cavity of the bearing bush is realized.

Drawings

FIG. 1 is a schematic view of a bearing shell to be repaired;

FIG. 2 is a front view of a clamp dedicated for bearing bushes of a press;

fig. 3 is a schematic view of the repair position processing of the nut to be repaired.

Wherein, the device comprises a 1-U-shaped groove fixing clamp, a 2-sliding groove block, a 3, 5-bolt and a 4-pressing block.

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.

1) The material of the press machine bearing bush belongs to the wear-resistant layer material of a low-speed heavy-load sliding friction part, and when the press machine bearing bush and a bearing shaft are in friction, the wear resistance of shaft parts is preferably ensured. Namely, the shaft part has better antifriction property, but the wear resistance and hardness are lower than those of the shaft part, which is the particularity and the processing principle which need to be mastered in the remanufacturing and repairing process.

2) The jet electrodeposition bearing bush repairing device comprises parts such as a liquid conveying pipeline, an electrolyte tank, an electrolyte pump, a flow rate control valve, a power supply, a numerical control nozzle system, a bearing bush workpiece clamping module and the like. As shown in the attached figure 2, an electrolyte tank, an electrolyte pump, a flow rate control valve, a nozzle system and a workpiece to be repaired are sequentially connected through all parts of a transfusion pipeline, the positive pole of a power supply is connected with a nozzle anode rod, and the negative pole of the power supply is connected with the workpiece to be repaired. After the electrolyte pump is started, the electrolyte flow is jetted to the workpiece (cathode) through the nozzle to form a closed loop, and necessary processing conditions of electrochemical processing are formed. The electrolyte tank, the electrolyte pump and the electrolyte recovery disc are divided into A, B sets, and are used for recycling electrolyte for repairing with different components, as shown in figure 2.

3) the bearing bush clamp device block consists of a chuck type workpiece clamp and a numerical control clamping platform. The fixture is characterized in that two inner sides of the upper end of the U-shaped groove fixing clamp are provided with a sliding groove, the sliding groove and the top surface of the U-shaped groove fixing clamp are on the same horizontal plane, a sliding groove block is placed in each sliding groove, and the sliding groove blocks can be fixed in the sliding grooves through fastening bolts. The two upper end faces of the U-shaped groove fixing clamp are respectively fixed with a fixing and clamping device which consists of a bolt and a cushion block, and the cushion block is provided with a waist-shaped long hole. The forging press bearing bush needing repairing is placed in the semicircular groove of the clamp, the bolts on the left side and the right side are tightened, and the gap of the sliding groove block in the sliding groove is utilized to enable the forging press bearing bush to move towards the center and be tightly attached to the surface of the U-shaped groove. When the two ends of the bearing bush of the forging press protrude out of the two upper end surfaces of the semicircular groove, the pressing blocks can press the two ends of the bearing bush by adjusting the position of the bolt in the waist-shaped hole, and the bolt is tightened to fix the bearing bush of the forging press in the special fixture. A recovery disc is arranged below the workpiece to be repaired, and can collect the electrolyte sprayed onto the surface of the workpiece and flow back to the electrolyte tank through a return pipe. As shown in fig. 3.

4) Pretreating the worn part of the inner surface of the bearing bush to be repaired: cleaning the spiral tooth surface and tooth root of the ultra-large copper nut by using gasoline to remove oil stains; gradually grinding and polishing by using 800-1200 mesh metallographic abrasive paper; thirdly, cleaning the polished material by using 35 g/L of sodium hydroxide solution, degreasing and removing oil on the surface: then, activating by using 10% concentrated sulfuric acid and 10% nitric acid mixed acid; fourthly, the mixture is washed clean by distilled water and dried.

5) The electrolyte for repairing is divided into two tanks AB: the electrolyte in the electrolyte tank A comprises the following components: 250 g/L of blue vitriol, 50 g/L of concentrated sulfuric acid, 10 g/L of lauryl sodium sulfate as surfactant and 20 g/L of superfine molybdenum disulfide powder (with the particle size of 10 microns). The electrolyte in the electrolyte tank B comprises the following components: 250 g/L of blue vitriol and 50 g/L of concentrated sulfuric acid. Before repairing the electrodeposition, the superfine molybdenum disulfide powder used in the tank A is subjected to pretreatment: water washing → dilute nitric acid washing → distilled water washing → drying. The temperature of the electrolyte is controlled to be 50 +/-2 ℃ by a constant-temperature water bath, and mechanical stirring is carried out at the speed of 1000 revolutions per minute, so that powder agglomeration is avoided.

6) And (4) evaluating according to the wear degree of the bearing bush, and selecting the caliber of the nozzle within a given nozzle selection range. The abrasion point of the bearing bush is preferably repaired by a circular nozzle. If the area is small, a fixed-point scanning mode can be adopted, and if the area is large, the nozzle system can be controlled to be repaired by adopting a filling type scanning path; the small scratches are also suitable for adopting a round nozzle; the wider band-shaped wear is preferably achieved by using a rectangular nozzle.

7) The repair thickness is between 100 and 1000 microns, and the number of scanning layers at the worn part is selected within the range of 4-8 layers. Each layer is divided into two working procedures of a bottom layer and a lubricant layer. The specific process is as follows: firstly, a tank B of electrolyte is selected, the distance between a nozzle and a workpiece is kept at 10mm, the reciprocating scanning is carried out on the surface of a base body by combining technological parameters of direct current (0.5A), the scanning speed is 300mm/min, and the jet flow speed is 150L/h, the number of layers is controlled to be 25, the process is a bottoming process, namely, a nanocrystalline coating with better surface appearance and flatness is preset on the surfaces of the base body and the next layer of lubricating layer, and the preparation is carried out for the lubricating layer arranged in the next step; secondly, an A tank electrolyte is selected, the distance between the nozzle and the workpiece is kept to be 5mm, the reciprocating scanning is carried out on the surface of the substrate by combining the technological parameters of pulse current (current 0.4A, pulse frequency 5000Hz, duty ratio 1:7), scanning speed of 50 mm/min and jet flow speed of 100L/h, and the number of layers is controlled to be 400. Pulse current is adopted, the current frequency is 5000Hz, the current density is 400A/dm2, the flow rate of the working fluid is 200L/h, and the duty ratio is 1: 7.

8) Before repair, the nozzle is positioned to the worn part of the inner surface of the bearing bush by a manipulator. The whole machining process and the numerical control mechanical device are set by a computer-set numerical control program. The program includes the settings of scanning times, scanning distance, the working start-stop frequency of the injection action and the like, the information is adjusted according to the actual processing requirements to obtain the optimal effect, and the processing path of the injection scanning and the number of the scanning layers are selected and optimized, so that the solid lubricating layer is accurately deposited in the damaged area of the inner surface of the bearing bush according to the specified position and thickness to form the effective repairable antifriction lubricating coating.

9) and (5) detecting the repairing effect. The surface repair of the bearing bush is completed in cooperation with the effect detection. And after the set repairing unit is finished, measuring the bearing bush/shaft gap by using the feeler gauge. If the specified thickness is not reached, the deposition repair of a new repair unit can be continued until the deposition thickness is reached.

As shown in the attached figure 1, a copper bush in a transmission pair of a high-speed press F300 is made of tin bronze, the inner diameter of the copper bush is 40mm, the outer diameter of the copper bush is 60mm, the thickness of the copper bush is 50mm, the abrasion loss of an abrasion part reaches 0.5mm, and scratches and abrasion are generated. In the process of taking a trial run, the phenomenon of burning is found out, causes the axle bush stress state uneven, the unbalance loading appears, and the unbalance loading condition worsens when speed improves, leads to the burn.

The repairing process includes the following steps:

Workpiece pretreatment: cleaning the spiral tooth surface and tooth root of the ultra-large copper nut by using gasoline to remove oil stains; gradually grinding and polishing by using 800-1200 mesh metallographic abrasive paper; thirdly, cleaning the polished material by using 35 g/L of sodium hydroxide solution, degreasing and removing oil on the surface: then, activating by using 10% concentrated sulfuric acid and 10% nitric acid mixed acid; fourthly, the distilled water is washed clean and dried.

an electrolyte A, B can was prepared with a predetermined composition. And (4) tank A comprises the following components: 250 g/L of blue vitriol, 50 g/L of concentrated sulfuric acid, 10 g/L of lauryl sodium sulfate as surfactant and 20 g/L of superfine molybdenum disulfide powder (with the particle size of 10 microns). And (4) tank B comprises the following components: 250 g/L of blue vitriol and 50 g/L of concentrated sulfuric acid.

Before the repair is started, the cleaned copper bearing bush is fixed on the clamping module, the nozzle is positioned to the worn part of the inner cavity of the bearing bush by operating the numerical control manipulator and the clamping module, and the preparation for repair deposition is made.

Through detection, the abrasion loss is 0.5mm, and 4 layers of packaging type composite lubricating layers are processed:

Layer 1 preparation process:

a priming link: a tank A is used for electrolyte, the distance between a nozzle and a workpiece is kept at 10mm, the reciprocating scanning is carried out on the surface of the substrate by combining the technological parameters of direct current (0.5A), scanning speed of 300mm/min and jet flow speed of 150L/h, and the number of layers is controlled to be 20.

Starting a numerical control program, wherein the codes are as follows:

O0001 (Main program number)

G54G90G00X-50Y80Z 10; (establishing a coordinate system of the workpiece, and quickly locating to the position of (-10,80, 10))

G01Z-100F 300; (position to (-50,80, -100) and feed speed 300mm/min)

M98P2L 10; (Call subroutine P2, execute 10 times, scan 20 layers)

M30 (end of program)

Subroutine P2 is omitted.

A solid lubricating layer preparation link: and (3) selecting B tank electrolyte, adjusting the scanning speed to be 50 mm/min, spraying the flow rate to be 100L/h, switching the programmable power supply to output pulse current, wherein the current is 0.5A, and the duty ratio is 1:7, the pulse frequency is 5000HZ,

The number of scanning layers is 400;

Starting a numerical control program, wherein the codes are as follows:

M98P2L 200; (Call subroutine P2, execute 200 times, scan 400 levels)

M30 (end of program) trigger end power pulse output

Subroutine P2 is omitted.

And sequentially processing 2-4 layers of packaging type composite lubricating layers.

After the program of the numerical control machining unit is finished, the nozzle is separated from the workpiece, and the machine tool is suspended.

and (5) carrying out hardness detection and outline geometric dimension detection. If the specified thickness is not reached, the next 4-layer repair unit deposition repair can be continued until the deposition thickness is reached. And finally, assembling the bearing bush with a qualified detection result with the shaft, and checking and accepting. Compared with the prior art, this hair beneficial effect:

(1) The jet electrodeposition method is suitable for processing copper antifriction solid lubrication metal, and the copper repair deposition layer and the copper alloy bearing bush material have a better combination state. Therefore, aiming at the application aspect of abrasion repair or friction reducing performance enhancement of the copper bearing bush material, the jet electrodeposition can better exert the characteristics of the copper bearing bush material, and can generate better effects in the aspects of size recovery and performance improvement, thereby achieving the purpose of shape cooperative manufacturing.

(2) the adopted novel copper solid lubrication coating has the characteristics of pertinence to bearing bush repair: has better friction reduction, but the wear resistance and hardness are lower than those of shafts. The material is in a porous form instead of a compact nanocrystalline form, the meshing softness, the embedding property and the compliance of the copper material are kept, and the lubricating molybdenum disulfide material is stored in the porous material, so that the antifriction property is improved.

(3) Compared with other coating preparation methods such as thermal spraying, laser cladding and the like, the method has the advantages that a heat affected zone does not exist, the preparation procedures and the post-treatment procedures are fewer, and the method is simpler and more practical.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.