SPRUE SPREADER SURFACE TREATMENT METHOD

Abstract

The disclosure discloses a sprue spreader surface treatment method, which comprises the following steps: preheating the sprue spreader, and carrying out laser scanning on the sprue spreader by using a laser; cleaning the surface of the sprue spreader, drying it by hot air, and polishing the surface to be bright by pneumatic polishing; and cleaning the surface of the sprue spreader again and drying it by hot air, so that the operation is simple, the cost is low, the bonding strength is high, the energy is saved, the environment is protected, and the service life of the sprue spreader can be prolonged.

Claims

1. A sprue spreader surface treatment method, comprising the following steps: S1, cleaning the surface of the sprue spreader, and drying it by hot air; S2, setting supersonic plasma spraying process parameters, wherein the voltage is 100-150 V, the current is 380-450 A, the spraying distance is 85-115 mm, the gas injection flow is 4.0-4.5 m3/h, the flight speed is 380-480 m/s, and the temperature is 1900-2500 C.; S3, controlling a spray gun to spray tungsten carbide powder on the surface of the sprue spreader by using a programmable control robot; S4, cleaning the surface of the sprue spreader, and drying it by hot air; S5, setting laser fusion process parameters: the positive defocus of the focal position of the light spot of the laser is 5-7 mm, the scanning speed is 2-3.5 mm/s, the scanning power is 3-4 KW, the overlap joint rate is 10-15%, the protective gas is N2, the oxygen content is below 200 ppm, and coaxially blowing air, and after the sprue spreader is preheated, carrying out laser scanning the sprue spreader by using a laser; and S6, cleaning the surface of the sprue spreader, drying it by hot air, and polishing the surface to be bright by pneumatic polishing; then cleaning the surface of the sprue spreader, and drying it by hot air.

2. The sprue spreader surface treatment method according to claim 1, wherein the thickness of the tungsten carbide after coating is 10-15 m.

3. The sprue spreader surface treatment method according to claim 2, wherein the hot air drying temperature is 60 C.

4. The sprue spreader surface treatment method according to claim 3, wherein the grain diameter of the carbide powder sprayed on the surface of the sprue spreader by the programmable control robot controlling the spray gun is 15-20 m.

5. The sprue spreader surface treatment method according to claim 4, wherein the light spot of the laser comprises a circular light spot with a diameter of 3 mm.

6. The sprue spreader surface treatment method according to claim 5, wherein the positive defocus of the focal position of the light spot of the laser is 6 mm, and the scanning speed is 2.5-3 mm/s.

7. The sprue spreader surface treatment method according to claim 6, wherein in step S4, the preheating temperature of the sprue spreader is 80 C., and the preheating time is 25 min.

8. The sprue spreader surface treatment method according to claim 7, wherein the laser comprises a CO2 laser.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings forming a part of the present disclosure are used to provide a further understanding of the present disclosure, and the schematic embodiments and the descriptions of the present disclosure serve to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0022] FIG. 1 is a flow chart of the sprue spreader surface treatment method according to the present disclosure;

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] It should be noted that the embodiments and the features in the embodiments of the present disclosure may be combined with each other without conflict.

[0024] The technical solution of the present disclosure will be described more clearly and completely with reference to the accompanying drawings in conjunction with the embodiments, and it is apparent that the described embodiments are only some but not all embodiments of the present disclosure. All other embodiments which can be obtained by a person with ordinary skill in the art without making any creative work based on the embodiments of the present disclosure belong to the claimed scope of the present disclosure.

Embodiment 1

[0025] Firstly, cleaning the surface of the sprue spreader by using alkali liquor to remove impurities such as oil stains and the like, and drying the sprue spreader by using hot air at 60 C.; by adopting a supersonic plasma spraying process, controlling a spray gun to spray tungsten carbide powder of 15 m on the surface of the sprue spreader by using a programmable control robot UR10, wherein the voltage is 100V, the current is 380 A, the spraying distance is 85 mm, the gas injection flow is 4.0 m.sup.3/h, the flight speed is 380 m/s, and the temperature is 1900 C.; secondly, cleaning the surface of the sprue spreader by using alkali liquor, preheating the sprue spreader for 25 minutes at 80 C. after drying the sprue spreader by using hot air at 60 C., and carrying out laser scanning the sprue spreader by using a CO2 laser, wherein the light spot of the laser is a circular light spot with a diameter of 3 mm, the positive defocus of the focal position is 6 mm, the scanning speed is 3 mm/s, the scanning power is 4 KW, the overlap joint rate is 15%, the protective gas is N2, the oxygen content is below 200 ppm, and coaxially blowing air; cleaning the surface of the sprue spreader again, drying the sprue spreader by hot air at 60 C., and polishing the surface of the sprue spreader by pneumatic polishing; finally, cleaning the surface of the sprue spreader, and drying the sprue spreader by hot air at 60 C., to obtain the sprue spreader with the size and the surface finish meeting the requirements, and the thickness of the coated tungsten powder is 15 m.

[0026] After spraying, the coating on the surface of the sprue spreader has a compactness of 95%, a bonding strength of 68 MPa, a porosity of 3.2%, and a coating density of 7.14 g/cm3.

Embodiment 2

[0027] Firstly, cleaning the surface of the sprue spreader by using alkali liquor to remove impurities such as oil stains and the like, and drying the sprue spreader by using hot air at 60 C.; by adopting a supersonic plasma spraying process, controlling a spray gun to spray tungsten carbide powder of 17 m on the surface of the sprue spreader by using a programmable control robot UR10, wherein the voltage is 120V, the current is 400 A, the spraying distance is 90 mm, the gas injection flow is 4.1 m.sup.3/h, the flight speed is 390 m/s, and the temperature is 2000 C.; secondly, cleaning the surface of the sprue spreader by using alkali liquor, preheating the sprue spreader for 25 minutes at 80 C. after drying the sprue spreader by using hot air at 60 C., and carrying out laser scanning the sprue spreader by using a CO2 laser, wherein the light spot of the laser is a circular light spot with a diameter of 3 mm, the positive defocus of the focal position is 6 mm, the scanning speed is 2.5 mm/s, the scanning power is 3 KW, the overlap joint rate is 10%, the protective gas is N2, the oxygen content is below 200 ppm, and coaxially blowing air; cleaning the surface of the sprue spreader again, drying the sprue spreader by hot air at 60 C., and polishing the surface of the sprue spreader by pneumatic polishing; finally, cleaning the surface of the sprue spreader, and drying the sprue spreader by hot air at 60 C., to obtain the sprue spreader with the size and the surface finish meeting the requirements, and the thickness of the coated tungsten powder is 10 m.

[0028] After spraying, the coating on the surface of the sprue spreader has a compactness of 94%, a bonding strength of 72 MPa, a porosity of 2.8%, and a coating density of 7.24 g/cm3.

Embodiment 3

[0029] Firstly, cleaning the surface of the sprue spreader by using alkali liquor to remove impurities such as oil stains and the like, and drying the sprue spreader by using hot air at 60 C.; by adopting a supersonic plasma spraying process, controlling a spray gun to spray tungsten carbide powder of 19 m on the surface of the sprue spreader by using a programmable control robot UR10, wherein the voltage is 140V, the current is 420 A, the spraying distance is 100 mm, the gas injection flow is 4.2 m.sup.3/h, the flight speed is 410 m/s, and the temperature is 2100 C.; secondly, cleaning the surface of the sprue spreader by using alkali liquor, preheating the sprue spreader for 25 minutes at 80 C. after drying the sprue spreader by using hot air at 60 C., and carrying out laser scanning the sprue spreader by using a CO2 laser, wherein the light spot of the laser is a circular light spot with a diameter of 3 mm, the positive defocus of the focal position is 6 mm, the scanning speed is 3 mm/s, the scanning power is 3.5 KW, the overlap joint rate is 11%, the protective gas is N2, the oxygen content is below 200 ppm, and coaxially blowing air; cleaning the surface of the sprue spreader again, drying the sprue spreader by hot air at 60 C., and polishing the surface of the sprue spreader by pneumatic polishing; finally, cleaning the surface of the sprue spreader, and drying the sprue spreader by hot air at 60 C., to obtain the sprue spreader with the size and the surface finish meeting the requirements, and the thickness of the coated tungsten powder is 12 m.

[0030] After spraying, the coating on the surface of the sprue spreader has a compactness of 97%, a bonding strength of 68 MPa, a porosity of 3.0%, and a coating density of 7.97 g/cm3.

Embodiment 4

[0031] Firstly, cleaning the surface of the sprue spreader by using alkali liquor to remove impurities such as oil stains and the like, and drying the sprue spreader by using hot air at 60 C.; by adopting a supersonic plasma spraying process, controlling a spray gun to spray tungsten carbide powder of 20 m on the surface of the sprue spreader by using a programmable control robot UR10, wherein the voltage is 150V, the current is 450 A, the spraying distance is 115 mm, the gas injection flow is 4.5 m.sup.3/h, the flight speed is 480 m/s, and the temperature is 2500 C.; secondly, cleaning the surface of the sprue spreader by using alkali liquor, preheating the sprue spreader for 25 minutes at 80 C. after drying the sprue spreader by using hot air at 60 C., and carrying out laser scanning the sprue spreader by using a CO2 laser, wherein the light spot of the laser is a circular light spot with a diameter of 3 mm, the positive defocus of the focal position is 6 mm, the scanning speed is 2.5 mm/s, the scanning power is 3 KW, the overlap joint rate is 12%, the protective gas is N2, the oxygen content is below 200 ppm, and coaxially blowing air; cleaning the surface of the sprue spreader again, drying the sprue spreader by hot air at 60 C., and polishing the surface of the sprue spreader by pneumatic polishing; finally, cleaning the surface of the sprue spreader, and drying the sprue spreader by hot air at 60 C., to obtain the sprue spreader with the size and the surface finish meeting the requirements, and the thickness of the coated tungsten powder is 11 m.

[0032] After spraying, the coating on the surface of the sprue spreader has a compactness of 92%, a bonding strength of 68 MPa, a porosity of 3.0%, and a coating density of 7.33 g/cm3.

Embodiment 5

[0033] Firstly, cleaning the surface of the sprue spreader by using alkali liquor to remove impurities such as oil stains and the like, and drying the sprue spreader by using hot air at 60 C.; by adopting a supersonic plasma spraying process, controlling a spray gun to spray tungsten carbide powder of 18 m on the surface of the sprue spreader by using a programmable control robot UR10, wherein the voltage is 130V, the current is 430 A, the spraying distance is 110 mm, the gas injection flow is 4.4 m.sup.3/h, the flight speed is 430 m/s, and the temperature is 2300 C.; secondly, cleaning the surface of the sprue spreader by using alkali liquor, preheating the sprue spreader for 25 minutes at 80 C. after drying the sprue spreader by using hot air at 60 C., and carrying out laser scanning the sprue spreader by using a CO2 laser, wherein the light spot of the laser is a circular light spot with a diameter of 3 mm, the positive defocus of the focal position is 6 mm, the scanning speed is 3 mm/s, the scanning power is 4 KW, the overlap joint rate is 14%, the protective gas is N2, the oxygen content is below 200 ppm, and coaxially blowing air; cleaning the surface of the sprue spreader again, drying the sprue spreader by hot air at 60 C., and polishing the surface of the sprue spreader by pneumatic polishing; finally, cleaning the surface of the sprue spreader, and drying the sprue spreader by hot air at 60 C., to obtain the sprue spreader with the size and the surface finish meeting the requirements, and the thickness of the coated tungsten powder is 13 m.

[0034] After spraying, the coating on the surface of the sprue spreader has a compactness of 89%, a bonding strength of 71 MPa, a porosity of 2.88%, and a coating density of 7.16 g/cm3.

Embodiment 6

[0035] Firstly, cleaning the surface of the sprue spreader by using alkali liquor to remove impurities such as oil stains and the like, and drying the sprue spreader by using hot air at 60 C.; by adopting a supersonic plasma spraying process, controlling a spray gun to spray tungsten carbide powder of 16 m on the surface of the sprue spreader by using a programmable control robot UR10, wherein the voltage is 110V, the current is 390 A, the spraying distance is 95 mm, the gas injection flow is 4.3 m.sup.3/h, the flight speed is 450 m/s, and the temperature is 2200 C.; secondly, cleaning the surface of the sprue spreader by using alkali liquor, preheating the sprue spreader for 25 minutes at 80 C. after drying the sprue spreader by using hot air at 60 C., and carrying out laser scanning the sprue spreader by using a CO2 laser, wherein the light spot of the laser is a circular light spot with a diameter of 3 mm, the positive defocus of the focal position is 6 mm, the scanning speed is 2.5 mm/s, the scanning power is 3.5 KW, the overlap joint rate is 13%, the protective gas is N2, the oxygen content is below 200 ppm, and coaxially blowing air; cleaning the surface of the sprue spreader again, drying the sprue spreader by hot air at 60 C., and polishing the surface of the sprue spreader by pneumatic polishing; finally, cleaning the surface of the sprue spreader, and drying the sprue spreader by hot air at 60 C., to obtain the sprue spreader with the size and the surface finish meeting the requirements, and the thickness of the coated tungsten powder is 14 m.

[0036] After spraying, the coating on the surface of the sprue spreader has a compactness of 95%, a bonding strength of 66 MPa, a porosity of 3.12%, and a coating density of 7.33 g/cm3.