Tungsten carbide spraying process and spraying mechanism

Abstract

The invention belongs to the technical field of tungsten carbide spraying, and particularly relates to a tungsten carbide spraying process and a spraying mechanism, which comprise the following steps: step 1, workpiece cleaning: using an ultrasonic cleaning machine with the frequency of 28-40kHz, cooperating with a neutral cleaning agent with the concentration of 3-5% and the cleaning time of 10-15 minutes, effectively shaking off small particle pollutants, and cleaning impurities on the inner surface and the outer surface of a workpiece; according to the tungsten carbide spraying process and the spraying mechanism, by adopting the refined tungsten carbide spraying process, efficient protection of the surface of a workpiece is successfully achieved, and the remarkable beneficial effects that the cleanliness of the surface of the workpiece and the binding force of a coating are greatly improved, and the stability and durability of the coating in a complex environment are ensured. And meanwhile, through optimized spraying parameters and accurate coating thickness control, the coating has excellent hardness and wear resistance, the service life of the workpiece is remarkably prolonged, and the reliability of the workpiece is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of tungsten carbide spraying, and in particular to a tungsten carbide spraying process and a spraying mechanism. Background Art

[0002] There are some technical problems in the traditional spraying process, which limit the improvement of coating quality and work efficiency. First, due to the lack of effective reciprocating spraying operations in the horizontal and vertical directions, the traditional spraying method often uses a fixed spray gun to spray, which makes it difficult to achieve uniform distribution of the coating on the surface of the workpiece, resulting in uneven coating thickness, affecting the appearance and functionality. Secondly, for workpieces with complex shapes or multi-axis features, traditional spraying technology is difficult to cover all corners, and it is easy to produce spraying dead corners, affecting the integrity and protective effect of the coating. In addition, the degree of automation of the spraying operation is not high and relies on manual operation, which is not only inefficient, but also increases the risk of contact between operators and harmful spraying materials, and the working environment is less safe. Therefore, a tungsten carbide spraying process and spraying mechanism are needed. Summary of the invention

[0003] Based on the existing technical problems, the present invention proposes a tungsten carbide spraying process and a spraying mechanism.

[0004] The invention proposes a tungsten carbide spraying process, comprising the following steps: step 1, workpiece cleaning, using an ultrasonic cleaning machine with a frequency of 28-40kHz, with a neutral cleaning agent, a concentration of 3%-5%, and a cleaning time of 10-15 minutes, effectively shaking off tiny particle pollutants and cleaning impurities on the inner and outer surfaces of the workpiece; Step 2: Protect the surface of the workpiece by using high temperature resistant tape or peelable paint to shield the parts that do not need to be sprayed. The thickness of the protective layer is 0.1-0.2mm; Step 3: Surface activation, using brown corundum or white corundum sandblasting material, particle size 24-36 mesh; spray gun pressure 0.4-0.6MPa, sandblasting distance 100-150mm, sandblasting angle 75°-85° with the workpiece surface, to ensure that uniform micro-pits are formed on the workpiece surface, and the surface roughness reaches Ra3.2-Ra6.3μm; Step 4: Preheating treatment: Place the workpiece in a heating furnace, heat it to 250-350°C at a heating rate of 150-250°C / hour, and keep it warm for 40-60 minutes to ensure full and uniform heating; Step 5: Spraying operation is performed by a spraying mechanism. The composition of the sprayed tungsten carbide powder material is 88% tungsten carbide, 10% cobalt, and 2% chromium. The size of the tungsten carbide powder is between 20-40 μm. Step 6: Heat preservation treatment: after spraying, immediately put the workpiece into the heat preservation furnace and keep it at 400-500°C for 1-2 hours to eliminate the internal stress of the coating and promote the homogenization of the structure; Step 7: Cleaning: remove the protective layer on the surface of the workpiece, use sandblasting or chemical solvents to clean the remaining protective material, and then use a soft brush with compressed air to clean the dust on the coating surface; Step 8: Coating inspection and performance test: The sample material is the same as the part material, and is bonded with high-strength epoxy glue or inorganic high-temperature glue. The test is carried out on a tensile testing machine according to national standards or industry standards to test the key performance indicators of coating bonding strength, hardness, and wear resistance. The bonding strength is 50MPa, the hardness is HRC60-65, and the wear rate is lower than the specified threshold.

[0005] Preferably, in the step 5, the material is dried in an oven at 100-120°C for 30-45 min before spraying; the pressure of the compressed air is 0.6-0.8 MPa, the spray gun flame jet speed is 300-400 m / s, the flame temperature is 2800-3200°C, and the particle speed is 200-300 m / s.

[0006] Preferably, the thickness of each coating in step five is less than 40 μm, the coating thickness range is: 0.12-0.20 mm, the coating thickness transitions smoothly at the edge of the designated area, the coating transitions from the sprayed area to the non-sprayed area at 20-30 um, and the transition width ranges from 5-10 mm.

[0007] A tungsten carbide spraying mechanism proposed in the present invention comprises an equipment base plate, support plates are fixedly installed at both ends of the top of the equipment base plate, a rotating motor is fixedly installed on the back of the top end of one of the support plates, the output end of the rotating motor is rotatably connected to a rotating shaft through a coupling, one end of the rotating shaft penetrates and extends to one side of the support plate, and a spraying jig is fixedly installed on one end of the rotating shaft, a workpiece to be sprayed is clamped on the spraying jig, and the support plate on which the rotating motor is installed is provided with a transfer groove relative to the top of the support plate, and the inner wall of the transfer groove is rotatably connected to the arc surface of one end of the spraying jig.

[0008] Preferably, the tops of the other two support plates are fixedly installed with limit plates, both ends of the limit plates are fixedly connected with connecting rods, the opposite ends of the two connecting rods are rotatably connected with adjusting screws through bearings, the threaded surface of the adjusting screws is threadedly connected with an adjusting slide, one side surface of the adjusting slide is slidably engaged with the surface of the limit plate, an adjusting motor is also fixedly installed on one side of the limit plate, and the output end of the adjusting motor is fixedly installed with the opposite end of the adjusting screw through a coupling.

[0009] Preferably, a connecting seat is fixedly installed on one side of the adjustment slide, a vertical plate is fixedly installed on the surface of the connecting seat, a supporting plate is fixedly installed on the bottom end of the vertical plate, a spring is fixedly installed on the top of the supporting plate, and sliding blocks are fixedly installed on the tops of the two springs.

[0010] Preferably, a vertical slide rail is fixedly installed in the middle of one side surface of the vertical vertical plate, and the surface of the vertical slide rail is slidably plugged into the surface of the sliding block. A cam motor is fixedly installed on the top of the vertical vertical plate, and a camshaft is fixedly installed on the output end of the cam motor through a coupling. A cam is fixedly installed on one end of the camshaft, and the arc surface of the cam is slidably plugged into the top of the sliding block.

[0011] Preferably, a connecting cross plate is fixedly installed on one side of the sliding block, a spray feed pipe is fixedly installed on the surface of the connecting cross plate, a first rotating spray pipe is fixedly installed on one end of the spray feed pipe, a first motor base is fixedly installed on the arc surface of the first rotating spray pipe, a first driving motor is fixedly installed on the surface of the first motor base, a first driving shaft is fixedly installed on the output end of the first driving motor through a coupling, a first gear is fixedly installed on one end of the first driving shaft, a second rotating spray pipe is rotatably connected to the inner wall of one end of the first rotating spray pipe, a first gear ring is fixedly installed on the arc surface of one end of the second rotating spray pipe, and a tooth groove of the first gear ring is meshed with the gear teeth of the first gear.

[0012] Preferably, the other end of the second rotary spray tube is inclined, and the inclined arc inner wall of the second rotary spray tube is rotatably connected to the third rotary spray tube, and the arc surface of the third rotary spray tube is fixedly installed with a second gear ring, and the arc surface of the second rotary spray tube close to the inclined end is fixedly installed with a second motor base, and the surface of the second motor base is fixedly installed with a second drive motor, and the output end of the second drive motor is fixedly installed with a second drive shaft through a coupling, and one end of the second drive shaft is fixedly installed with a second gear, and the gear teeth of the second gear are meshed with the tooth grooves of the second gear ring.

[0013] Preferably, one end of the third rotary spray tube is inclined, and a spray gun is rotatably connected to the inclined arc inner wall of the third rotary spray tube, a third gear ring is fixedly installed on the arc surface of the spray gun, a third motor base is fixedly installed on the arc surface of the third rotary spray tube close to the inclined end, a third drive motor is fixedly installed on the surface of the third motor base, a third drive shaft is fixedly installed on the output end of the third drive motor through a coupling, a third gear is fixedly installed on one end of the third drive shaft, and the gear teeth of the third gear are meshed with the tooth grooves of the third gear ring.

[0014] The beneficial effects of the present invention are: 1. By adopting this refined tungsten carbide spraying process, we have successfully achieved efficient protection of the workpiece surface, bringing significant beneficial effects: the cleanliness of the workpiece surface and the coating adhesion have been greatly improved, ensuring the stability and durability of the coating in complex environments. At the same time, the optimized spraying parameters and precise coating thickness control make the coating have excellent hardness and wear resistance, significantly improving the service life and reliability of the workpiece. In addition, through heat preservation treatment and thorough cleaning steps, the internal stress of the coating is further eliminated, ensuring the stability of the coating performance, bringing customers an efficient and long-lasting mechanical parts protection solution, and greatly improving the market competitiveness of the product.

[0015] 2. In summary, by adjusting the screw to realize the horizontal reciprocating spraying operation along the axis of the workpiece, the concentrically coordinated cam to rotate in the vertical reciprocating spraying operation, and the second rotary spraying tube, the third rotary spraying tube and the spray gun to synchronously rotate the spraying operation, this comprehensive spraying technology has achieved multiple beneficial effects: First, all-round and uniform spraying of the workpiece in the horizontal and vertical directions is realized, which greatly improves the uniformity and quality of the coating; secondly, the synchronous rotary spraying operation ensures that every corner of the workpiece with complex shapes can be accurately covered, reducing the dead corners and missed coating of the spraying; in addition, this highly automated spraying process improves production efficiency, shortens the production cycle, and reduces labor costs; at the same time, it reduces the direct contact between operators and spraying materials, and improves the safety of the working environment; finally, through precise spraying control and the flexibility of equipment, the adaptability and reliability of the spraying process are enhanced, providing efficient, stable and high-quality spraying solutions for various workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a tungsten carbide spraying process and a spraying mechanism; Figure 2 It is a three-dimensional diagram of a tungsten carbide spraying process and a connecting rod structure of a spraying mechanism; Figure 3 It is a three-dimensional diagram of a tungsten carbide spraying process and a limit plate structure of a spraying mechanism; Figure 4 It is a three-dimensional diagram of a tungsten carbide spraying process and a vertical plate structure of a spraying mechanism; Figure 5 It is a three-dimensional diagram of a tungsten carbide spraying process and a connecting horizontal plate structure of a spraying mechanism; Figure 6 The present invention is a three-dimensional diagram of the third rotary spray tube structure of a tungsten carbide spraying process and a spraying mechanism.

[0017] In the figure: 1. Equipment bottom plate; 2. Support plate; 3. Rotating motor; 4. Rotating shaft; 5. Spraying fixture; 6. Adapter groove; 7. Limiting plate; 8. Connecting rod; 9. Adjusting screw; 10. Adjusting slide seat; 11. Adjusting motor; 12. Connecting seat; 13. Vertical plate; 14. Support plate; 15. Spring; 16. Sliding block; 17. Vertical slide rail; 18. Cam motor; 19. Camshaft; 20. Cam; 21. Connecting horizontal plate; 22. Spraying feed pipe; 23. First rotating spray Coating tube; 24, first motor base; 25, first drive motor; 26, first drive shaft; 27, first gear; 28, second rotary spray tube; 29, first gear ring; 30, third rotary spray tube; 31, second gear ring; 32, second motor base; 33, second drive motor; 34, second drive shaft; 35, second gear; 36, spray gun; 37, third gear ring; 38, third motor base; 39, third drive motor; 40, third drive shaft; 41, third gear. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Embodiment 1 A tungsten carbide spraying process comprises the following steps: Step 1, workpiece cleaning, using an ultrasonic cleaning machine with a frequency of 28-40kHz, a neutral cleaning agent with a concentration of 3%-5%, and a cleaning time of 10-15 minutes to effectively shake off tiny particle pollutants and clean impurities on the inner and outer surfaces of the workpiece.

[0020] Step 2: Protect the surface of the workpiece. Use high temperature resistant tape or peelable paint to shield and protect the parts that do not need to be sprayed. The thickness of the protective layer is 0.1-0.2mm.

[0021] Step 3: Surface activation: use brown corundum or white corundum sandblasting material with a particle size of 24-36 mesh; spray gun pressure 0.4-0.6MPa, sandblasting distance 100-150mm, sandblasting angle 75°-85° with the workpiece surface, to ensure uniform micro-pits are formed on the workpiece surface, and the surface roughness reaches Ra3.2-Ra6.3μm.

[0022] Step 4: Preheating treatment: Place the workpiece in a heating furnace, heat it to 250-350°C at a heating rate of 150-250°C / hour, and keep it warm for 40-60 minutes to ensure full and uniform heating.

[0023] Step 5: Spraying operation is performed through a spraying mechanism. The composition of the sprayed tungsten carbide powder material is 88% tungsten carbide, 10% cobalt, and 2% chromium. The size of the tungsten carbide powder is between 20-40μm.

[0024] In step 5, the material is dried in an oven at 100-120°C for 30-45 min before spraying; the pressure of the compressed air is 0.6-0.8 MPa, the spray gun flame jet speed is 300-400 m / s, the flame temperature is 2800-3200°C, and the particle speed is 200-300 m / s.

[0025] In step five, the thickness of each coating is less than 40 μm, and the coating thickness range is: 0.12-0.20 mm. The coating thickness transitions smoothly at the edge of the designated area. The coating transitions from the spraying area to the non-spraying area at 20-30 μm, and the transition width ranges from 5-10 mm.

[0026] Step 6: Insulation treatment: After spraying, immediately place the workpiece into an insulation furnace and keep it at 400-500°C for 1-2 hours to eliminate the internal stress of the coating and promote tissue homogenization.

[0027] Step 7: Cleaning: remove the protective layer on the surface of the workpiece, use sandblasting or chemical solvents to clean the remaining protective material, and then use a soft brush with compressed air to clean the dust on the coating surface.

[0028] Step 8: Coating inspection and performance test: The sample material is the same as the part material, and is bonded with high-strength epoxy glue or inorganic high-temperature glue. The test is carried out on a tensile testing machine according to national standards or industry standards to test the key performance indicators of coating bonding strength, hardness, and wear resistance. The bonding strength is 50MPa, the hardness is HRC60-65, and the wear rate is lower than the specified threshold.

[0029] By adopting this refined tungsten carbide spraying process, we have successfully achieved efficient protection of the workpiece surface, bringing significant beneficial effects: the cleanliness of the workpiece surface and the coating adhesion have been greatly improved, ensuring the stability and durability of the coating in complex environments. At the same time, the optimized spraying parameters and precise coating thickness control make the coating have excellent hardness and wear resistance, significantly improving the service life and reliability of the workpiece. In addition, through heat preservation treatment and thorough cleaning steps, the internal stress of the coating is further eliminated, ensuring the stability of the coating performance, providing customers with an efficient and long-lasting mechanical parts protection solution, and greatly improving the market competitiveness of the product.

[0030] Embodiment 2 Reference Figure 1-Figure 6A tungsten carbide spraying mechanism includes an equipment base plate 1, support plates 2 are fixedly installed at both ends of the top of the equipment base plate 1, a rotating motor 3 is fixedly installed on the back of the top of one support plate 2, the output end of the rotating motor 3 is rotatably connected with a rotating shaft 4 through a coupling, one end of the rotating shaft 4 passes through and extends to one side of the support plate 2, and a spraying fixture 5 is fixedly installed at one end of the rotating shaft 4, a workpiece to be sprayed is clamped on the spraying fixture 5, and a transfer groove 6 is opened at the top of the support plate 2 on which the rotating motor 3 is installed relative to the support plate 2, and the inner wall of the transfer groove 6 is rotatably connected to the arc surface of one end of the spraying fixture 5.

[0031] Specifically, the rotating shaft 4 is driven by the rotating motor 3 so that the spraying jig 5 can rotate accurately, thereby ensuring a uniform spraying process, a consistent coating thickness, and improving the spraying quality; the design of the rotating spraying jig 5 allows the workpiece to be sprayed at different angles, reducing the time for clamping and positioning the workpiece and improving production efficiency; the rotation of the spraying jig 5 allows all parts of the workpiece surface to be evenly contacted with the spraying material, avoiding the problem of uneven coating caused by improper spraying angles.

[0032] A limit plate 7 is fixedly installed on the top of the other two support plates 2, and connecting rods 8 are fixedly connected to both ends of the limit plate 7. The opposite ends of the two connecting rods 8 are rotatably connected to adjusting screws 9 through bearings. The threaded surface of the adjusting screw 9 is threadedly connected to an adjusting slide 10. One side surface of the adjusting slide 10 is slidably plugged into the surface of the limit plate 7. An adjusting motor 11 is also fixedly installed on one side of the limit plate 7, and the output end of the adjusting motor 11 is fixedly installed with the opposite end of the adjusting screw 9 through a coupling.

[0033] Specifically, since the adjusting slide 10 can slide along the limit plate 7, it can be quickly adjusted according to the size and shape of different workpieces, thereby improving the flexibility of the equipment and realizing the spraying operation by horizontal reciprocating movement; the adjusting motor 11 is connected to the adjusting screw 9 through a coupling, and the rotation of the adjusting screw 9 can be accurately controlled, and then the position of the adjusting slide 10 can be adjusted through threaded movement, thereby realizing fine adjustment of the spraying position of the workpiece.

[0034] A connecting seat 12 is fixedly installed on one side of the adjusting slide 10, a vertical plate 13 is fixedly installed on the surface of the connecting seat 12, a supporting plate 14 is fixedly installed on the bottom end of the vertical plate 13, a spring 15 is fixedly installed on the top of the supporting plate 14, and sliding blocks 16 are fixedly installed on the tops of the two springs 15.

[0035] Specifically implemented in this way, the up and down reciprocating motion of the sliding block 16 can make the spraying operation move evenly in the vertical direction, so as to achieve uniform coating thickness and improve the spraying quality; through mechanized reciprocating motion, the coating can be evenly distributed on the workpiece surface, reducing the problem of inconsistent coating thickness caused by uneven manual operation; by adjusting the reciprocating motion range and speed of the sliding block 16, it can adapt to the requirements of different workpieces and spraying materials, thereby improving the adaptability of the equipment.

[0036] A vertical slide rail 17 is also fixedly installed in the middle of one side surface of the vertical vertical plate 13, and the surface of the vertical slide rail 17 is slidably plugged into the surface of the sliding block 16. A cam motor 18 is fixedly installed on the top of the vertical vertical plate 13, and a cam shaft 19 is fixedly installed on the output end of the cam motor 18 through a coupling. A cam 20 is fixedly installed on one end of the cam shaft 19, and the arc surface of the cam 20 is slidably plugged into the top of the sliding block 16.

[0037] Specifically implemented in this way, the design of the cam 20 allows the cam motor 18 to accurately control the up and down reciprocating motion of the sliding block 16, thereby achieving accurate spraying path and speed; the tungsten carbide spraying mechanism of the cam 20 mechanism not only improves the accuracy and consistency of spraying by accurately controlling the reciprocating motion of the sliding block 16, but also improves the degree of automation and operational safety of the equipment, providing an efficient, stable and flexible solution for the spraying process.

[0038] A connecting cross plate 21 is fixedly installed on one side of the sliding block 16, a spray feed pipe 22 is fixedly installed on the surface of the connecting cross plate 21, a first rotary spray pipe 23 is fixedly installed on one end of the spray feed pipe 22, a first motor base 24 is fixedly installed on the arc surface of the first rotary spray pipe 23, a first drive motor 25 is fixedly installed on the surface of the first motor base 24, a first drive shaft 26 is fixedly installed on the output end of the first drive motor 25 through a coupling, a first gear 27 is fixedly installed on one end of the first drive shaft 26, a second rotary spray pipe 28 is rotatably connected to the inner wall of one end of the first rotary spray pipe 23, a first gear ring 29 is fixedly installed on the arc surface of one end of the second rotary spray pipe 28, and the tooth groove of the first gear ring 29 is meshed with the gear teeth of the first gear 27.

[0039] Specifically implemented in this way, the rotation of the second rotary spray tube 28 enables the spray material to evenly cover the surface of the workpiece, avoiding the problem of uneven coating; through the first drive motor 25 and the gear transmission system, the rotation speed and angle of the second rotary spray tube 28 can be accurately controlled to meet different spraying requirements.

[0040] The other end of the second rotary spraying tube 28 is arranged at an angle, and the inclined arc inner wall of the second rotary spraying tube 28 is rotatably connected to the third rotary spraying tube 30, and the arc surface of the third rotary spraying tube 30 is fixedly installed with a second gear ring 31, and the arc surface of the second rotary spraying tube 28 near the inclined end is fixedly installed with a second motor base 32, and the surface of the second motor base 32 is fixedly installed with a second drive motor 33, and the output end of the second drive motor 33 is fixedly installed with a second drive shaft 34 through a coupling, and one end of the second drive shaft 34 is fixedly installed with a second gear 35, and the gear teeth of the second gear 35 are meshed with the tooth grooves of the second gear ring 31.

[0041] Specifically implemented in this way, the tilted setting and rotation ability of the third rotary spray tube 30 enable spraying from different angles, covering the complex surface of the workpiece, and improving the integrity and uniformity of the coating; the combined use of two rotary spray tubes can expand the spraying area, so that the coating can better cover various parts of the workpiece, especially the difficult-to-reach areas; because spraying can be carried out from multiple angles, the coating is more uniform, reducing problems such as uneven coating thickness and missing coating, and improving the coating quality.

[0042] One end of the third rotary spray tube 30 is inclined, and the inclined arc inner wall of the third rotary spray tube 30 is rotatably connected to a spray gun 36, and a third gear ring 37 is fixedly installed on the arc surface of the spray gun 36, and a third motor base 38 is fixedly installed on the arc surface of the third rotary spray tube 30 near the inclined end, and a third drive motor 39 is fixedly installed on the surface of the third motor base 38, and a third drive shaft 40 is fixedly installed on the output end of the third drive motor 39 through a coupling, and a third gear 41 is fixedly installed on one end of the third drive shaft 40, and the gear teeth of the third gear 41 are meshed with the tooth grooves of the third gear ring 37.

[0043] Specifically implemented in this way, the rotation of the spray gun 36 is combined with the rotation of the second and third rotary spray tubes 30, thereby realizing all-round spraying of the workpiece in three-dimensional space, ensuring that the coating can be evenly covered in every corner of the workpiece; the rotation of the spray gun 36 enables the spraying material to be distributed in a uniform fan-shaped pattern, further improving the uniformity of the coating and reducing the uneven coating thickness caused by the fixed spraying angle; three-dimensional rotary spraying reduces the possibility of spraying dead angles and missing coating, and improves the overall quality of the coating.

[0044] The rotation of the spray gun 36 can also make the spray material more evenly distributed during the spraying process, reducing the spraying dead angle caused by the fixed spray gun 36. Synchronous reciprocating motion: By controlling the reciprocating motion of the spray gun 36, the coating can be evenly covered on the surface of the workpiece, avoiding uneven coating thickness caused by spraying at a fixed position of the spray gun 36. Vertical swing spraying: The swing of the spray gun 36 in a direction perpendicular to the reciprocating motion can further increase the uniformity of the coating and reduce the coating stripes caused by the fixed trajectory of the spray gun 36.

[0045] In summary, by adjusting the screw 9 to realize the horizontal reciprocating spraying operation along the axis of the workpiece, the coaxial cam 20 rotates to reciprocate in the vertical direction to spray, and the second rotary spray tube 28, the third rotary spray tube 30 and the spray gun 36 synchronously rotate to spray, this comprehensive spraying technology achieves multiple beneficial effects: first, it realizes all-round and uniform spraying of the workpiece in the horizontal and vertical directions, greatly improving the uniformity and quality of the coating; secondly, the synchronous rotary spraying operation ensures that every corner of the workpiece with complex shapes can be accurately covered, reducing the dead corners and missing coating phenomena of spraying; in addition, this highly automated spraying process improves production efficiency, shortens the production cycle, and reduces labor costs; at the same time, it reduces the direct contact between operators and spraying materials, and improves the safety of the working environment; finally, through precise spraying control and the flexibility of equipment, the adaptability and reliability of the spraying process are enhanced, providing efficient, stable and high-quality spraying solutions for various types of workpieces.

[0046] Working principle: During the spraying operation, the workpiece is first clamped above the spraying fixture 5, and the rotating shaft 4 is used to rotate to drive the spraying fixture 5 to drive the spraying work to rotate. When spraying, the spray gun 36 is opened for spraying. By adjusting the forward and reverse rotation of the screw 9, the spray gun 36 is controlled to move back and forth in the horizontal direction for spraying. At the same time, the cam 20 is rotated to control the spray gun 36 to reciprocate in the vertical direction for spraying, and then the second rotary spray tube 28 and the third rotary spray tube 30 and the spray gun 36 are synchronously driven to rotate and spray at the same time, so as to achieve uniform spraying of the workpiece without dead angles.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tungsten carbide spraying process, characterized in that: The process includes the following steps: Step 1: Workpiece cleaning, using an ultrasonic cleaning machine with a frequency of 28-40kHz, a neutral cleaning agent with a concentration of 3%-5%, and a cleaning time of 10-15 minutes, to effectively shake off tiny particle pollutants and clean impurities on the inner and outer surfaces of the workpiece; Step 2: Protect the surface of the workpiece by using high temperature resistant tape or peelable paint to shield the parts that do not need to be sprayed. The thickness of the protective layer is 0.1-0.2mm; Step 3: Surface activation, using brown corundum or white corundum sandblasting material, particle size 24-36 mesh; spray gun pressure 0.4-0.6MPa, sandblasting distance 100-150mm, sandblasting angle 75°-85° with the workpiece surface, to ensure that uniform micro-pits are formed on the workpiece surface, and the surface roughness reaches Ra3.2-Ra6.3μm; Step 4: Preheating treatment: Place the workpiece in a heating furnace, heat it to 250-350°C at a heating rate of 150-250°C / hour, and keep it warm for 40-60 minutes to ensure full and uniform heating; Step 5: Spraying operation is performed by a spraying mechanism. The composition of the sprayed tungsten carbide powder material is 88% tungsten carbide, 10% cobalt, and 2% chromium. The size of the tungsten carbide powder is between 20-40 μm. Step 6: Heat preservation treatment: after spraying, immediately put the workpiece into the heat preservation furnace and keep it at 400-500°C for 1-2 hours to eliminate the internal stress of the coating and promote the homogenization of the structure; Step 7: Cleaning: remove the protective layer on the surface of the workpiece, use sandblasting or chemical solvents to clean the remaining protective material, and then use a soft brush with compressed air to clean the dust on the coating surface; Step 8: Coating inspection and performance test: The sample material is the same as the part material, and is bonded with high-strength epoxy glue or inorganic high-temperature glue. The test is carried out on a tensile testing machine according to national standards or industry standards to test the key performance indicators of coating bonding strength, hardness, and wear resistance. The bonding strength is 50MPa, the hardness is HRC60-65, and the wear rate is lower than the specified threshold.

2. A tungsten carbide spraying process according to claim 1, characterized in that: In step 5, the material is dried in an oven at 100-120° C. for 30-45 min before spraying; the pressure of the compressed air is 0.6-0.8 MPa, the flame spraying speed of the spray gun (36) is 300-400 m / s, the flame temperature is 2800-3200° C., and the particle speed is 200-300 m / s.

3. A tungsten carbide spraying process according to claim 1, characterized in that: In the step 5, the thickness of each coating is less than 40 μm, the coating thickness range is: 0.12-0.20 mm, the coating thickness transitions smoothly at the edge of the designated area, the coating transitions from the spraying area to the non-spraying area at 20-30 μm, and the transition width ranges from 5-10 mm.

4. A tungsten carbide spraying mechanism, using a tungsten carbide spraying process as claimed in any one of claims 1 to 3, characterized in that: The invention comprises an equipment base plate (1), support plates (2) are fixedly mounted at both ends of the top of the equipment base plate (1), a rotating motor (3) is fixedly mounted on the back of the top of one of the support plates (2), the output end of the rotating motor (3) is rotatably connected to a rotating shaft (4) via a coupling, one end of the rotating shaft (4) penetrates and extends to one side of the support plate (2), and a spraying jig (5) is fixedly mounted on one end of the rotating shaft (4), a spraying workpiece is clamped on the spraying jig (5), and a transfer groove (6) is opened on the support plate (2) on which the rotating motor (3) is mounted relative to the top of the support plate (2), and the inner wall of the transfer groove (6) is rotatably connected to the arc surface of one end of the spraying jig (5).

5. A tungsten carbide spraying mechanism according to claim 4, characterized in that: A limit plate (7) is fixedly mounted on the top of the other two support plates (2), and connecting rods (8) are fixedly connected to both ends of the limit plate (7), and the opposite ends of the two connecting rods (8) are rotatably connected to adjusting screws (9) via bearings, and the threaded surface of the adjusting screw (9) is threadedly connected to an adjusting slide seat (10), and one side surface of the adjusting slide seat (10) is slidably plugged with the surface of the limit plate (7), and an adjusting motor (11) is also fixedly mounted on one side of the limit plate (7), and the output end of the adjusting motor (11) is fixedly mounted to the opposite end of the adjusting screw (9) via a coupling.

6. A tungsten carbide spraying mechanism according to claim 5, characterized in that: A connecting seat (12) is fixedly mounted on one side of the adjusting slide seat (10), a vertical upright plate (13) is fixedly mounted on the surface of the connecting seat (12), a supporting plate (14) is fixedly mounted on the bottom end of the vertical upright plate (13), a spring (15) is fixedly mounted on the top of the supporting plate (14), and sliding blocks (16) are fixedly mounted on the tops of the two springs (15).

7. A tungsten carbide spraying mechanism according to claim 6, characterized in that: A vertical slide rail (17) is also fixedly mounted on the middle of one side surface of the vertical upright plate (13), the surface of the vertical slide rail (17) is slidably plugged into the surface of the sliding block (16), a cam motor (18) is fixedly mounted on the top of the vertical upright plate (13), a cam shaft (19) is fixedly mounted on the output end of the cam motor (18) via a coupling, a cam (20) is fixedly mounted on one end of the cam shaft (19), and the arc surface of the cam (20) is slidably plugged into the top of the sliding block (16).

8. A tungsten carbide spraying mechanism according to claim 6, characterized in that: A connecting transverse plate (21) is fixedly mounted on one side of the sliding block (16); a spray feed pipe (22) is fixedly mounted on the surface of the connecting transverse plate (21); a first rotary spray pipe (23) is fixedly mounted on one end of the spray feed pipe (22); a first motor base (24) is fixedly mounted on the circular arc surface of the first rotary spray pipe (23); a first drive motor (25) is fixedly mounted on the surface of the first motor base (24); a first drive shaft (26) is fixedly mounted on the output end of the first drive motor (25) via a coupling; a first gear (27) is fixedly mounted on one end of the first drive shaft (26); a second rotary spray pipe (28) is rotatably connected to the inner wall of one end of the first rotary spray pipe (23); a first gear ring (29) is fixedly mounted on the circular arc surface of one end of the second rotary spray pipe (28); a tooth groove of the first gear ring (29) meshes with the gear teeth of the first gear (27).

9. A tungsten carbide spraying mechanism according to claim 8, characterized in that: The other end of the second rotary spraying tube (28) is arranged in an inclined manner; the inner wall of the inclined circular arc of the second rotary spraying tube (28) is rotatably connected to the third rotary spraying tube (30); a second gear ring (31) is fixedly mounted on the circular arc surface of the third rotary spraying tube (30); a second motor base (32) is fixedly mounted on the circular arc surface of the second rotary spraying tube (28) close to the inclined end; a second drive motor (33) is fixedly mounted on the surface of the second motor base (32); a second drive shaft (34) is fixedly mounted on the output end of the second drive motor (33) via a coupling; a second gear (35) is fixedly mounted on one end of the second drive shaft (34); the gear teeth of the second gear (35) mesh with the tooth grooves of the second gear ring (31).

10. A tungsten carbide spraying mechanism according to claim 9, characterized in that: One end of the third rotary spraying tube (30) is arranged in an inclined manner, and a spray gun (36) is rotatably connected to the inner wall of the inclined circular arc of the third rotary spraying tube (30), and a third gear ring (37) is fixedly mounted on the circular arc surface of the spray gun (36). A third motor base (38) is fixedly mounted on the circular arc surface of the third rotary spraying tube (30) close to the inclined end, and a third drive motor (39) is fixedly mounted on the surface of the third motor base (38). A third drive shaft (40) is fixedly mounted on the output end of the third drive motor (39) via a coupling, and a third gear (41) is fixedly mounted on one end of the third drive shaft (40), and the gear teeth of the third gear (41) are meshed with the tooth grooves of the third gear ring (37).

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