Main terms and spraying parameters of spraying robot-Songle Intelligent Equipment

Spraying robots are industrial robots that can automatically spray paint or spray other paints. They are mainly composed of a robot body, a computer and a corresponding control system. The hydraulically driven paint spraying robot also includes hydraulic oil sources, such as oil pumps, fuel tanks, and motors. 5 or 6-degree-of-freedom articulated structure is mostly used, the arm has a large space for movement, and can do complex trajectory movements. The wrist generally has 2 to 3 degrees of freedom and can move flexibly. So, what are the terms for spray robots? Do you know its key parameters?

1. Coating efficiency, coating efficiency and coating efficiency of spraying robot

Painting efficiency is the efficiency of spraying operations, including the spraying area per unit time, the effective utilization of paint and spraying area. Coating efficiency is the ratio of the amount of paint applied on the object to the total amount of paint sprayed during the spraying process, or the ratio of the measured thickness on the surface of the object to the thickness of the coating film calculated from the amount of paint sprayed. , Which is the transferefficency of coating (transferefficency referred to as TE) or coating utilization.

Coating efficiency refers to the ratio of the actual sprayed surface area of the coated object to the coverage area of the spray gun; in order to make the coating film at the edge of the coated object complete, the coverage area of the spray gun should generally be larger than the area of the coated object.

The spraying trajectory of the spraying robot refers to the sequence and stroke of the spray gun during the spraying process. The spraying robot can imitate the spraying trajectory of a skilled painter.

耀彩网The paint flow rate of the spraying robot is the amount of paint lost to each rotary cup per unit time, also known as the spraying flow and the amount of paint (rate). In addition to the rotating cup speed, the paint flow rate is the second factor that affects the fineness of atomized particles. When other parameters remain unchanged, the lower the flow rate of the paint, the finer the atomized particles, but at the same time it will also lead to an increase in the volatilization of the solvent in the paint mist.

The high paint flow rate of the spraying robot will form a corrugated coating film. At the same time, when the paint flow rate is too high and the spin cup is overloaded, the coating film on the edge of the spin cup will thicken to a certain extent, resulting in the groove pattern on the spin cup not being able to divert the paint. And the appearance of lamellar patent leather, which will produce the undesirable phenomenon of bubbles or uneven paint drop size.

耀彩网The maximum paint flow rate of each spray gun of the Songle spraying robot is related to the diameter of the high-speed rotating cup and the density of the rotating speed paint. The upper limit is determined by the fineness of the atomization and the effect of electrostatic coating. Practical experience shows that the coating should be input at a constant speed, and fluctuations in a small range will not affect the quality of the coating film.

In the actual spraying process of the spraying robot, the sprayed area of each rotary cup is different, and the flow rate of the paint is also different. In addition, due to the change of the shape of the object to be coated, the flow rate of the paint of the rotary cup will also change. Take the spraying of the car body as an example. When spraying large areas such as door panels, the amount of paint spit out should be large. When spraying door and window columns, the amount of paint spit out should be small, and the spit out paint is automatically and accurately controlled during the spraying process. In order to ensure the uniformity of coating quality and film thickness, this is also one of the important measures to improve coating utilization.

The rotating cup speed of the spraying robot is the factor that has the greatest influence on the atomization fineness of the high-speed rotating cup. When other process parameters remain unchanged, the greater the rotation speed of the spin cup, the smaller the diameter of the paint drop. In the slightly lower speed range, the influence of the rotation speed on the atomization fineness is significantly greater than in the high speed range.

耀彩网The rotation speed of the spin cup of the Songle spraying robot will affect the film thickness. When the rotation speed is too low, the coating film will be rough; spraying robots and atomizing too fine will cause the loss of paint mist (causing overspray), causing fluctuations in the thickness of the coating film. sensitive. In addition to overspray, the excessively high rotation speed of the spin cup can also cause excessive wear of the turbine bearings, increase the consumption of compressed air for cleaning, and reduce the solvent content in the coating film. The best spinning cup speed of the spraying robot can be determined according to the flow rate characteristics of the paint used. Therefore, the spinning cup speed for surface tension water-based coatings and high-viscosity two-component coatings is higher than that of ordinary solvent-based coatings.

In general, the rotating cup speed of the spraying robot is 6X10^4r/min without load, and the speed range set at load is (1.0~4.2) X10^4r/min, the error is ±500r/min.

耀彩网Electrostatic spraying technology has become the mainstream spraying technology in today's automobile industry, and the application of electrostatic automatic spraying equipment has brought the middle and top coating of automobiles into the era of automation. The following is a brief description of the main spraying parameters of the spraying robot.

The flow rate of the electrostatic spray robot is the amount of paint delivered to the spin cup per unit time, also known as the discharge amount. The size of the flow affects the thickness of the paint film. Different colors of paint have different hiding power and different construction film thickness. During the spraying process, the spraying area of each robot is different, and the set flow rate is also different. At the same time, the flow rate is also related to the shape of the sprayed object. For automobiles, the regular five-door and one-cover profile generally has a large flow rate, while the column, ridge, and corner flow rate is small.

The gas is sprayed from the evenly distributed small holes on the back side of the rotating cup to limit the amplitude of the paint mist (fan width) and push the atomized paint mist to the object to be coated, and place the paint mist to diffuse and rebound to pollute the rotating cup and Atomizer. For metallic paints, the spray pattern affects the final color effect, and if the spray pattern is not appropriate, zebra patterns or blooming are prone to appear. The setting of the spray width is related to the distance between the two guns, and the number of paint stacks is 3 times. For example, if the distance between the two guns is 100mm, the spray width is best controlled to 300mm, so that the same paint can be superimposed 3 times.

Rotating cup speed is a key parameter for paint atomization. The centrifugal force generated when the rotating cup rotates at a high speed makes the paint atomized very finely (50-100μm). The smaller the diameter of the paint drop, the better the smoothness of the paint film, the smaller the orange peel effect, and the higher the gloss. The rotation speed setting is also related to the type of paint. The rotation speed of the colored paint is relatively small, and the rotation speed of the middle coat and varnish is relatively high. Rotation speed and flow rate are also related. If the flow rate is large, the speed should be increased to achieve a better atomization effect. However, if the rotation speed is too high, the paint sprayed on the object will be dry, which will cause orange peel problems.

耀彩网In electrostatic spraying, the coated object is the positive electrode, and the spin cup is the negative electrode. After a high voltage is applied between the two poles, a strong electric attraction is generated, so that the atomized paint mist particles are transferred to the surface of the coated object. The magnitude of the high voltage affects the electrostatic effect of electrostatic spraying, the painting rate, and the uniformity of the paint film.

耀彩网Flow rate, speed, forming air and high pressure directly affect the quality of the film, and also affect the utilization rate of the paint. In the production, it is necessary to adjust the characteristics of the paint and the parameters of the atomizer. The four-in-one parameters must be comprehensively considered and continuously optimized to achieve the ideal spraying effect.