Selection and process control of surface treatment

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Selection and process control of equipment surface treatment

with the progress and development of human civilization, people have higher requirements for visual perception, such as environmental beautification, room decoration, etc. as long as people and objects can be contacted in production and life, they are inseparable from the decoration of the external surface of the electro-hydraulic servo universal material testing machine, and the mechanical manufacturing industry is no exception. It is not only necessary to ensure the performance and quality of the equipment, Besides completing the complex manufacturing process, the external surface of the equipment should be decorated. Whether a device can be accepted by users or not, the appearance feeling is a key link. The use environment faced by the brick and tile machinery manufacturing industry is more special. The appearance decoration of the equipment is not only for decoration, but also to deal with the harsh and complex use environment. Choose different surface treatments according to different use environments, including details control in the treatment process. The treatment of the external surface of the equipment is a subject that cannot be ignored. The following is an analysis of this problem:

I On the surface, karau said: "With the gradual crushing of polymer, the choice of mechanism

1. A device is composed of parts, and then the parts are combined into an independent unit with perfect functions. The surface treatment of each part will be required from the technical design to the manufacturing process design. Generally, the exposed decorative parts are generally galvanized and chrome plated; the conductive functional parts are silver plated; the transmission parts that have been in the lubricating liquid for a long time adopt hair Blue, blackened; Grinding and fine turning can be selected to match the sliding contact surface to obtain high fitting accuracy and anti-corrosion surface; For general functional parts, most of them will choose surface spraying, which can fully meet the needs, which is economical and simple. These conventional treatment methods mentioned above are commonly used by our brick and tile machinery manufacturing enterprises. As a manufacturing enterprise mainly engaged in mechanical processing, it is unrealistic to complete these functional surface treatments independently, which requires full consideration of the processing capacity of the enterprise and surrounding outsourcing enterprises in the process of technology and process design. If we have to rely on professional external forces to achieve, quality and cost control will be an important factor for our designers to consider

2. When the type of surface treatment is selected and can not fully meet the requirements of the equipment, it is also necessary to distinguish the functional color. The basic parts of the equipment should be unified in one color to form a beautiful color of the enterprise to highlight the characteristics of the enterprise; The color of moving parts and rotating parts is relatively fixed, which is mainly eye-catching on the premise of being different from the basic parts; Enterprise logo, safety prompt logo and function prompt logo form their own characteristics, focusing on coordination and beauty

3. After the color of the basic parts of the equipment is determined, generally speaking, the matte surface is selected. The characteristics of the matte surface are soft color and easy to integrate with different environments. More importantly, it is to avoid the reflection of the bright surface of the equipment and affect the induction action of other equipment. With the continuous upgrading of the degree of automation, higher requirements are put forward to control and reduce the mutual interference between equipment, and surface treatment is no exception, Under the premise of considering the function satisfaction, try not to affect other facilities as much as possible, but also coordinate and match with the environment. Surface treatment will be a new topic in front of technical design and process designers

II. Process control of surface treatment

the surface treatment of parts is relatively simple. Because the parts are small, light and simple in shape, it is relatively easy to do surface treatment, but the basic parts of a device have large weight and volume and complex structure, which brings great difficulty to surface treatment. The following focuses on the surface treatment of basic parts

1. Influence of preliminary treatment of the body surface on spraying

the cleanliness of the substrate surface seriously affects the adhesion of the coating coating, and the residual or adsorbed water, oil and other foreign matters on the surface of the workpiece are not eliminated, which will directly affect the spraying quality. After phosphating, the steel base parts shall be sprayed in time within no more than 20 hours, and the steel parts shall be sprayed within 4 hours after sandblasting and shot blasting. Controlling the spraying time after pre-treatment is helpful to improve the adhesion between the coating and the substrate and enhance its corrosion resistance

the compressed air used for spraying shall be subject to oil-water separation. The moisture in the compressed air will inevitably affect the quality of the spraying layer. The filter in the oil-water separation facilities shall be cleaned and replaced regularly to keep the compressed air clean and improve the quality of the spraying layer

the environmental temperature and humidity at the spraying site have a significant impact on the quality of the sprayed film. Generally speaking, the ambient temperature of the spraying site is in the range of 10-30 ℃, and the relative humidity is not more than 70%. The site is kept clean and can increase the service life of the testing machine, which is hygienic, tidy and orderly

ordinary air spraying. Pay attention to keep the distance between the spray gun and the sprayed surface within the range of 200-300mm, and control the compressed air pressure at 2-4kg/c ㎡, so as to effectively ensure the painting quality

2. The selection of hard chromium electroplating layer on the piston rod after grinding and polishing

the performance of the coating has a great relationship with the corrosion resistance of the coated metal, and the performance varies with the type of coating. Only by selecting the type of coating according to the performance of the coating can the anti-corrosion protection effect of the spray coating be more effective. The selection of paint base, solvent and additives should be appropriate. The mixing proportion must be in strict accordance with the process requirements to ensure that it is diluted to the required viscosity

3. Pre spraying treatment

selecting the appropriate coating to ensure the correct construction method is not enough to ensure the spraying effect. The pre substrate treatment is crucial. The treated substrate surface and the naturally corroded substrate surface of the same brand are sprayed with the same kind of protection. Due to the influence of corrosion, the corrosion rate of the naturally corroded substrate and the treated substrate is dozens of times higher, and the anti-corrosion protection effect is also lower than the latter. The defects on the metal surface and the adsorption of moisture and active ions (cl-, br-, etc.) in the atmosphere will affect or even accelerate the falling off of the sprayed layer and metal corrosion to varying degrees. The application of pretreatment and surface treatment processes such as purification and degreasing, activation and derusting before metal surface spraying can effectively improve the anti-corrosion performance of spraying. Effective degreasing, derusting or sand blasting before surface coating can purify the substrate surface, ensure the good adhesion between the coating film and the substrate metal, and improve the corrosion resistance of spraying

the rationality of technical design and process design is the premise, and the manufacturing process should be strictly implemented in accordance with the design specifications. Only by paying attention to the details of the process can the expected effect be achieved

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