Method for avoiding edge paint accumulation of paint-sprayed part

Abstract

The invention belongs to the technical field of part paint spraying, and discloses a method for avoiding edge paint accumulation of a paint-sprayed part, which comprises the following steps: performing injection molding on the part through an injection mold to obtain a complete part; the surface of the injection molding part is cleaned through cleaning equipment and dried; the size of the edge of the part is determined, the part is fixed to a workbench, the position, close to the edge, of the surface of the part is polished through a polishing device, and the roughness of corners of the part is increased through polishing; the position 1-3 mm away from the starting point of the inclined face where the edge of the part is polished is polished, the fillet radius of the corner of the part is 0.5 mm, then resistance borne by paint for paint spraying on the edge is reduced, flowing of the paint is facilitated, the paint is prevented from being accumulated on the edge of the surface of the part, the curvature of the edge of the part is reduced through the fillet arrangement, the paint flows more smoothly, and the service life of the part is prolonged. And the paint on the edge of the surface of the part is smoother, so that the appearance quality of the painted product is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of parts spray painting, and in particular relates to a method for preventing paint accumulation on edges of spray-painted parts. Background Art

[0002] Traditional hardware parts, also called small hardware and hardware accessories, refer to various metal parts made by physical processing such as forging, rolling, cutting, etc. of iron, steel, aluminum, etc. Hardware parts include mold hardware parts, mechanical hardware parts, daily hardware parts, window hardware parts, ship hardware parts, construction hardware parts, aerospace hardware parts, and security products, etc.

[0003] In the process of mechanical equipment production and manufacturing, the requirements for paint spraying of the main body of the machine and its supporting parts are relatively high, and the mechanical paint spraying brushing process is also relatively complicated. The paint coating of mechanical machine tool accessories generally requires three processes of spraying primer, topcoat and varnish; the main function of mechanical primer is to protect the surface of the machine workpiece from scratches, and also to enhance the adhesion of the mechanical topcoat; mechanical topcoat is the industrial paint color we usually see, and its direct function is to enhance the beauty of the metal surface appearance of the mechanical equipment, and of course it also plays a protective role; mechanical varnish is a transparent paint coating also called varnish, which is sprayed on the basis of the mechanical topcoat to make the topcoat look shiny, with high gloss and fullness. Even if some dust falls on the car, the car still looks clean.

[0004] However, when existing parts are sprayed with surface paint, the paint mist sprayed from the spray gun stays on the surface of the parts for a certain time. During this process, some paint mist molecules will adhere to the surface of the object to form a paint film, while other molecules will gradually settle in the air. Since the edge of the part has a large curvature, the paint mist encounters greater resistance during movement and is easily accumulated on the edge of the part.

[0005] To this end, we propose a method to avoid paint accumulation on the edges of painted parts to solve the problems existing in the prior art. Through design compensation, the curvature of the edge of the part is reduced to allow the paint mist to flow more smoothly. At the same time, the reduction in the edge height of the part compensates for the accumulation of paint on the edge, avoiding paint accumulation on the edge of the painted parts and reducing the quality. Summary of the invention

[0006] The purpose of the present invention is to provide a method for preventing paint accumulation on the edges of painted parts, so as to solve the problem proposed in the above background technology that in the prior art during painting, some paint mist molecules will adhere to the surface of the object to form a paint film, while other molecules will gradually settle in the air. Since the edge of the part has a large curvature, the paint mist encounters greater resistance during movement and is easily accumulated on the edge of the part.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for preventing paint accumulation on the edges of painted parts comprises the following steps:

[0009] S1. Inject the parts through the injection mold to obtain complete parts;

[0010] S2. Clean the surface of the injection molded parts by cleaning equipment and dry them;

[0011] S3, determining the size of the edge of the part, fixing the part on the workbench (1), and grinding the surface of the part near the edge by a grinding device to increase the roughness of the corners of the part;

[0012] S4. Grind the edge of the part 1-3mm from the starting point of the inclined surface, and the fillet radius of the corner of the part is 0.5mm;

[0013] S5. After polishing, the painted parts are cleaned again, and then the painted parts are dried after cleaning;

[0014] S6. Spray the parts evenly around the parts by annular spraying, control the spraying distance and spraying speed, spray the paint evenly on the surface and around the parts, and let the paint settle evenly on the surface of the parts under the action of gravity;

[0015] S7. After the painting is completed, the paint is dried by a drying device after natural cooling for a period of time, and the painting work on the parts is completed.

[0016] Preferably, in step S3, the part is placed on the positioning mechanism, the positioning mechanism 4 is moved to the bottom of the grinder by the displacement mechanism, the position adjustment of the grinder is controlled by the mechanical arm in the protective cover, so that the grinding wheel of the grinder is tilted from a horizontal state, the grinder is started to grind the edge of the part, the grinding wheel of the grinder contacts the edge of the part, and pre-grinds to form a rough surface, the grinder is controlled by the mechanical arm to descend along the Z-axis direction, and the grinding depth is controlled so that the grinding depth is reduced by 0.3mm at the edge of the product surface, and the length of the grinded inclined surface is controlled to be 1-3mm, and the corners are grinded.

[0017] Preferably, the robotic arm includes an X-axial moving mechanism, a Y-axial moving mechanism, a Z-axial moving mechanism and an angle adjustment mechanism, and the grinder is installed at the lower end of the angle adjustment mechanism, and the grinder is controlled to approach the part through the X-axial moving mechanism, the Y-axial moving mechanism and the Z-axial moving mechanism.

[0018] Preferably, the angle adjustment mechanism includes an electric push rod rotatably connected to the Z-axis moving mechanism, the telescopic end of the electric push rod is rotatably connected to a mounting hinge fixed on the grinder, the grinder is rotatably connected to a connecting stabilizing rod, and the upper end of the connecting stabilizing rod is fixedly connected to the Z-axis moving mechanism, so that the grinder can be flipped with the lower end of the connecting stabilizing rod as the axis.

[0019] Preferably, in step S4, the program parameters of the X-axial moving mechanism and the angle adjustment mechanism are set, and then the chamfering of the inclined surface of the part and the side angle of the part is set, the distance between the grinder and the part is controlled by the X-axial moving mechanism, and at the same time, the angle between the grinding wheel of the grinder and the horizontal plane is gradually reduced by extending the electric push rod, and the height of the grinder is fine-tuned by the Z-axial moving mechanism to complete the rounded corner grinding of the part with a radius of 0.5 mm.

[0020] Preferably, the operations in steps S3 and S4 are repeated so that the X-axial moving mechanism, the Y-axial moving mechanism, the Z-axial moving mechanism and the angle adjustment mechanism adjust the position of the grinder to achieve grinding and chamfering operations on multiple edges of the part. After grinding, inspection is performed by visual inspection, hand inspection or using a measuring tool.

[0021] Preferably, in step S5, the polished parts are placed in a cleaning device and cleaned with a cleaning agent to remove surface dust and oil stains, rinsed at least three times, and dried with a hot air blower.

[0022] Preferably, in step S6, the chamfered parts are placed on a paint spraying table in a dust-free box. A plurality of negative pressure suction holes are provided on the surface of the paint spraying table. The parts are adsorbed and positioned by negative pressure. The side walls and edges of the parts are sprayed by side wall spray guns on both sides of the inner cavity of the dust-free box. The surface of the parts is sprayed by a surface spray gun on the top of the dust-free box. The distances between the side wall spray gun and the surface spray gun and the parts are consistent.

[0023] Preferably, the side wall spray gun and the top spray gun are both adjusted to have the same distance from the parts through a cylinder so that the distance between the spray gun and the parts is the same. The distance between the spray gun and the parts should be controlled between 10-15 cm, and the paint can be evenly sprayed on the surface of the parts. The paint mist sprayed from the spray gun will stay on the surface of the parts for a certain time, and a paint film will be formed on the surface of the parts during the retention process. In addition, the paint molecules settle at the edge of the parts due to the setting of the inclined surface and the rounded corners under the action of gravity, so that the paint at the edge can be drained to the side wall.

[0024] Preferably, the air pressure regulating valve on the spray gun is adjusted to ensure that the air pressure is between 150-250 psi, and the spray width knob is adjusted according to the specifications of the parts to be painted to make the spray width fit the parts, and finally the flow rate of the spray is adjusted.

[0025] The method for preventing paint accumulation on the edges of painted parts proposed by the present invention has the following advantages compared with the prior art:

[0026] 1. The present invention forms a friction surface by initially grinding the edge of the part, thereby reducing the resistance of the paint at the edge, facilitating the flow of the paint, and preventing the paint from accumulating at the edge of the part surface;

[0027] 2. The present invention adopts a rounded corner setting to reduce the curvature of the edge of the part, allowing the paint to flow more smoothly and the paint at the edge of the part surface to be smoother, thereby improving the appearance quality of the product after painting. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a flowchart of the present invention;

[0029] Figure 2 It is a schematic diagram of the cross-sectional structure of the edge of a part of the present invention;

[0030] Figure 3 It is a schematic diagram of the cross-sectional structure of paint accumulation on the surface of a part in the prior art;

[0031] Figure 4 Schematic diagram of the grinding device structure of the present invention

[0032] Figure 5 The schematic diagram of the X, Y, Z axial movement mechanism and angle adjustment mechanism of the present invention is shown in FIG.

[0033] Figure 6 It is a schematic structural diagram of the paint spraying device of the present invention.

[0034] As shown in the figure: 1. Workbench; 2. Protective cover; 3. Displacement mechanism; 4. Positioning mechanism; 5. X-axis moving mechanism; 6. Y-axis moving mechanism; 7. Z-axis moving mechanism; 8. Angle adjustment mechanism; 9. Grinder; 10. Dust-free box; 11. Paint spraying station; 13. Spray gun. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] The present invention provides Figure 1-2 A method for preventing paint accumulation on the edge of a painted part as shown in 4-6 comprises the following steps:

[0037] S1. Inject the parts through the injection mold to obtain complete parts, avoiding flash and burrs on the corners of the parts that may affect the measured curvature;

[0038] S2. Clean the surface of the injection molded parts with cleaning equipment and dry them. After cleaning, it is convenient to accurately measure the parts and then determine the scope of grinding;

[0039] S3. Determine the size of the edge of the part, and fix the part on the workbench 1. Use a grinding device to grind the surface of the part near the edge to produce a rough surface. After the part is fixed, the stability of the grinding is improved to avoid the movement of the part during grinding and improve the flatness of the grinding surface.

[0040] S4. Grind the edge of the part at 1-3mm from the starting point of the inclined surface. The radius of the corner of the part is 0.5mm to control the minimum height of the chamfer. Then, the inclined surface and the side wall of the part are set in an arc shape to improve the smoothness of the paint flow and thus improve the smoothness of the paint surface of the part.

[0041] S5. After polishing, the parts to be painted are cleaned again, and then dried to ensure that the surface of the parts has good adhesion, so that the paint can be well attached to the surface of the parts to form a paint film;

[0042] S6. Spray the parts evenly around the parts by annular spraying, control the spraying distance and spraying speed, so that the paint is evenly sprayed on the surface and around the parts, and the paint settles evenly on the surface of the parts under the action of gravity. Paint the parts around first, and then spray the parts on the surface. Paint molecules settle under the action of gravity and then spread evenly on the surface of the parts to avoid paint accumulation at the edge of the part surface;

[0043] S7. After the painting is completed, the paint is dried through a drying device after natural cooling for a period of time to complete the painting of the parts. Avoid direct drying after the painting is completed. Direct drying may cause air and cracks on the paint surface, which will affect the quality of the paint layer.

[0044] like Figure 4As shown, in step S3, the part is placed on the positioning mechanism 4, and the positioning mechanism 4 is moved to the bottom of the grinder 9 by the displacement mechanism 3. The position adjustment of the grinder 9 is controlled by the mechanical arm in the protective cover 2, so that the grinding wheel of the grinder 9 is tilted from a horizontal state, and the grinder 9 is started to grind the edge of the part. The grinding wheel of the grinder 9 contacts the edge of the part and pre-grinds to form a frosted surface. The grinder 9 is controlled to descend along the Z-axis direction by the mechanical arm, and the grinding depth is controlled to reduce the grinding depth by 0.3mm at the edge of the product surface. At the same time, the length of the polished inclined surface is controlled to be 1-3mm, and the grinding depth is the height of the product surface at the edge. At the same time, the length of the inclined surface is the distance between the transition starting position and the edge of the part, so that the edge of the part is pre-processed into an inclined surface to reduce the tension of the paint on the edge of the part surface.

[0045] like Figure 5 As shown, the robot arm includes an X-axis moving mechanism 5, a Y-axis moving mechanism 6, a Z-axis moving mechanism 7 and an angle adjustment mechanism 8. The grinder 9 is installed at the lower end of the angle adjustment mechanism 8. The X-axis moving mechanism 5, the Y-axis moving mechanism 6 and the Z-axis moving mechanism 7 are convenient for controlling the grinder 9 to approach the part, thereby facilitating the grinding process on the edge of the part. The X-axis moving mechanism 5 includes an X-axis guide rail, an X-axis transmission screw and an X-axis moving seat. The Y-axis moving mechanism 6 includes a Y-axis guide rail, a Y-axis transmission screw and a Y-axis moving seat arranged on the X-axis moving seat. The Z-axis moving mechanism 7 includes a Z-axis guide rail, a Z-axis transmission screw and a Z-axis moving seat arranged on the Y-axis moving seat.

[0046] like Figure 5 As shown, the angle adjustment mechanism 8 includes an electric push rod rotatably connected to the Z-axis moving mechanism, the telescopic end of the electric push rod is rotatably connected to a mounting hinge seat fixed on the grinder 9, the grinder 9 is rotatably connected to a connecting stabilizing rod, the upper end of the connecting stabilizing rod is fixedly connected to the Z-axis moving mechanism 7, so that the grinder 9 is flipped with the lower end of the connecting stabilizing rod as the axis, the electric push rod is rotatably installed on the lower surface of the Z-axis moving seat, the upper end of the connecting stabilizing rod is fixedly connected to the lower surface of the Z-axis moving seat, and the telescopic end of the electric push rod is extended, so that the end of the grinder 9 close to the electric push rod is lowered, and conversely, the end of the grinder 9 close to the electric push rod is raised, thereby realizing the adjustment of the grinding angle.

[0047] In step S4, the program parameters of the X-axis moving mechanism 5 and the angle adjustment mechanism 8 are set, and then the inclined surface of the part and the side angle of the part are rounded. The distance between the grinder 9 and the part is controlled by the X-axis moving mechanism 5. At the same time, the angle between the grinding wheel of the grinder 9 and the horizontal plane is gradually reduced by extending the electric push rod, and the height of the grinder 9 is fine-tuned by the Z-axis moving mechanism 7 to achieve rounded corner grinding with a radius of 0.5 mm. The inclination angle of the grinding wheel of the grinder 9 is gradually reduced by slowly contracting the telescopic end of the electric push rod, and then the inclined surface of the part is polished close to the side under the advancement of the X-axis moving mechanism 5 and the lifting of the Z-axis moving mechanism 7, so as to improve the frosting degree of the edge of the product and increase the adhesion area of ​​the paint and the corners.

[0048] Repeat the operations in steps S3 and S4 to adjust the position of the grinder 9 by the X-axial moving mechanism 5, the Y-axial moving mechanism 6, the Z-axial moving mechanism 7 and the angle adjustment mechanism 8 to achieve multiple edge grinding operations on the parts. After completion, visual inspection, hand inspection or inspection with measuring tools are performed to ensure the smoothness of the parts after compensating the corners and the smoothness of the flow of the paint.

[0049] In step S5, the polished parts are placed in a cleaning device for rinsing to clean the dust on the surface of the parts, and the cleaned parts are air-dried to clean the dust during polishing, thereby increasing the adhesion between the paint and the parts.

[0050] like Figure 6 As shown, in step S6, the polished parts are placed on the paint spraying table 11 in the dust-free box 10. The surface of the paint spraying table 11 is provided with multiple groups of negative pressure suction holes. The parts are adsorbed and positioned by negative pressure, and the side walls and edges of the parts are sprayed by the side wall spray guns 13 on both sides of the inner cavity of the dust-free box 10. Then, the surface of the parts is sprayed by the surface spray gun 13 on the top of the dust-free box 10. The distances between the side wall spray gun 13 and the surface spray gun 13 and the parts should be consistent to ensure the uniformity of spraying. The dry, dust-free and temperature-appropriate dust-free box 10 can ensure the uniformity of paint spraying, improve the quality of paint spraying, and under the action of gravity, the paint molecules are deposited in the air, so that the paint on the edge of the part is flush with the surface paint, thereby improving the flatness of the paint spraying and avoiding the paint accumulation at the edge of the part surface.

[0051] The side wall spray gun 13 and the top spray gun 13 are both adjusted by the cylinder to have the same distance from the parts, and the distance between the spray gun 13 and the parts should be controlled between 10-15cm, so that the paint can be evenly sprayed on the surface of the parts. The paint mist sprayed from the spray gun 13 will stay on the surface of the parts for a certain time, and a paint film will be formed on the surface of the parts during the retention process. In addition, the paint molecules settle at the edge of the parts due to the setting of the inclined surface and the fillet under the action of gravity, so that the paint at the edge can be drained to the side wall. By controlling the distance between the spray gun 13 and the parts, the paint mist droplets are prevented from being too large or too small, resulting in uneven spraying. At the same time, the paint will be drained to the fillet by the inclined surface, avoiding excessive tension and accumulation of the paint due to excessive curvature at the edge of the parts, thereby improving the appearance quality of the product.

[0052] By adjusting the air pressure regulating valve on the spray gun 13, ensure that the air pressure is between 150-250psi, and at the same time adjust the spray width knob according to the specifications of the parts to be painted to make the spray width fit the parts, and finally adjust the flow rate of the spray material to avoid uneven paint spraying. The overall operation is simple, and can effectively avoid the phenomenon of paint accumulation on the edges of the painted parts. The resulting painted parts meet the appearance quality.

[0053] like Figure 1-2 As shown, 14 is the injection-molded body of the part with design compensation, and 15 is the actual paint layer that meets the requirements of the part.

[0054] like Figure 3 As shown, since the edge of the object has a large curvature, the paint encounters greater resistance during movement and is prone to accumulate on the edge of the part;

[0055] 16 is the injection molding body of the part, 17 is the theoretical paint layer, and 18 is the actual paint layer.

[0056] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preventing paint accumulation on the edges of painted parts, characterized in that: The steps include: S1. Inject the parts through the injection mold to obtain complete parts; S2. Clean the surface of the injection molded parts by cleaning equipment and dry them; S3, determining the size of the edge of the part, fixing the part on the workbench (1), and grinding the surface of the part near the edge by a grinding device to increase the roughness of the corners of the part; S4. Grind the edge of the part 1-3mm from the starting point of the inclined surface, and the fillet radius of the corner of the part is 0.5mm; S5. After polishing, the painted parts are cleaned again, and then the painted parts are dried after cleaning; S6. Spray the parts evenly around the parts by annular spraying, control the spraying distance and spraying speed, spray the paint evenly on the surface and around the parts, and let the paint settle evenly on the surface of the parts under the action of gravity; S7. After the painting is completed, the paint is dried by a drying device after natural cooling for a period of time, and the painting work on the parts is completed.

2. A method for preventing paint accumulation on the edges of painted parts according to claim 1, characterized in that: In step S3, the part is placed on the positioning mechanism (4), and the positioning mechanism (4) is moved to the bottom of the grinder (9) by the displacement mechanism (3). The position adjustment of the grinder (9) is controlled by the mechanical arm in the protective cover (2), so that the grinding wheel of the grinder (9) is tilted from a horizontal state, and the grinder (9) is started to grind the edge of the part. The grinding wheel of the grinder (9) contacts the edge of the part and pre-grinds to form a rough surface. The grinder (9) is controlled by the mechanical arm to descend along the Z-axis direction, and the grinding depth is controlled so that the grinding depth is reduced by 0.3 mm at the edge of the product surface. At the same time, the length of the grinded inclined surface is controlled to be 1-3 mm, and the corners are grinded.

3. A method for preventing paint accumulation on the edges of painted parts according to claim 2, characterized in that: The mechanical arm comprises an X-axis moving mechanism (5), a Y-axis moving mechanism (6), a Z-axis moving mechanism (7) and an angle adjustment mechanism (8); the grinder (9) is installed at the lower end of the angle adjustment mechanism (8); and the grinder (9) is controlled to approach the part by the X-axis moving mechanism (5), the Y-axis moving mechanism (6) and the Z-axis moving mechanism (7).

4. A method for preventing paint accumulation on the edges of painted parts according to claim 3, characterized in that: The angle adjustment mechanism (8) comprises an electric push rod rotatably connected to the Z-axis moving mechanism, the telescopic end of the electric push rod is rotatably connected to a mounting hinge fixed on the grinder (9), the grinder (9) is rotatably connected to a connecting stabilizing rod, the upper end of the connecting stabilizing rod is fixedly connected to the Z-axis moving mechanism (7), thereby enabling the grinder (9) to flip around the lower end of the connecting stabilizing rod as the axis.

5. A method for preventing paint accumulation on the edges of painted parts according to claim 4, characterized in that: In step S4, program parameters of the X-axis moving mechanism (5) and the angle adjustment mechanism (8) are set, and the angle of the inclined surface of the part and the side angle of the part are rounded. The distance between the grinder (9) and the part is controlled by the X-axis moving mechanism (5). At the same time, the angle between the grinding wheel of the grinder (9) and the horizontal plane is gradually reduced by extending the electric push rod, and the height of the grinder (9) is finely adjusted by the Z-axis moving mechanism (7). The rounded corner grinding of the corner radius of the part is completed with a radius of 0.5 mm.

6. A method for preventing paint accumulation on the edges of painted parts according to claim 5, characterized in that: Repeat the operations in steps S3 and S4 to adjust the position of the grinder (9) by the X-axis moving mechanism (5), the Y-axis moving mechanism (6), the Z-axis moving mechanism (7) and the angle adjustment mechanism (8), and grind multiple edges of the part. After grinding, perform visual inspection, hand inspection or use a measuring tool to inspect.

7. A method for preventing paint accumulation on the edges of painted parts according to claim 6, characterized in that: In step S5, the polished parts are placed in a cleaning device and cleaned with a cleaning agent to remove surface dust and oil stains. The parts are rinsed at least three times and dried with a hot air blower.

8. A method for preventing paint accumulation on the edges of painted parts according to claim 7, characterized in that: In step S6, the chamfered parts are placed on a spray painting table (11) in a dust-free box (10). The surface of the spray painting table (11) is provided with a plurality of negative pressure suction holes. The parts are positioned by suction through negative pressure. The side walls and edges of the parts are sprayed by side wall spray guns (13) on both sides of the inner cavity of the dust-free box (10). The surface of the parts is then sprayed by a surface spray gun (13) on the top of the dust-free box (10). The distances between the side wall spray gun (13) and the surface spray gun (13) and the parts are consistent.

9. A method for preventing paint accumulation on the edges of painted parts according to claim 8, characterized in that: The side wall spray gun (13) and the top spray gun (13) are both adjusted to have the same distance from the parts through the cylinder, and the distance between the spray gun (13) and the parts should be controlled between 10-15 cm, so that the paint can be evenly sprayed on the surface of the parts. The paint mist sprayed from the spray gun (13) will stay on the surface of the parts for a certain period of time, and a paint film will be formed on the surface of the parts during the retention process. In addition, the paint molecules settle at the edge of the parts due to the setting of the inclined surface and the rounded corners under the action of gravity, so that the paint at the edge can be drained to the side wall.

10. A method for preventing paint accumulation on the edges of painted parts according to claim 9, characterized in that: By adjusting the air pressure regulating valve on the spray gun (13), ensure that the air pressure is between 150-250psi, and adjust the spray width knob according to the specifications of the parts to be painted to make the spray width fit the parts, and finally adjust the flow rate of the spray material.

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