Process Flow of Manual Large-Scale Powder Coating Booth and Manual Curing Oven

The manual large-scale powder coating booth and manual curing oven are used together to form a complete manual powder coating process flow. Centered on six core links: "Workpiece Preparation → Manual Spraying → Powder Recovery → Workpiece Transfer → Manual Curing → Finished Product Inspection", the entire process adopts a manual operation mode, which is flexibly suitable for the coating needs of large, special-shaped and small-batch workpieces. The process is simple and easy to operate, taking into account both coating quality and production flexibility, and is applicable to the surface treatment scenarios of large workpieces in industries such as hardware processing, equipment manufacturing and steel structure.

I. Overview of the Process Flow

Overall process flow: Workpiece Preparation → Workpiece Positioning → Manual Powder Spraying → Powder Recovery → Workpiece Transfer → Manual Curing → Finished Product Inspection → Warehousing. All links are smoothly connected, no complex automatic debugging is required, and it can be flexibly adjusted according to workpiece specifications and coating requirements to realize integrated manual operation of "spraying-curing", ensuring that each process meets the powder coating process standards.

II. Detailed Process Flow Description

(I) Workpiece Preparation

Before starting the process flow, it is necessary to pre-treat the large workpieces to be coated, which is a key link to ensure coating adhesion and avoid subsequent coating peeling. First, remove oil stains, rust, dust and other impurities on the surface of the workpiece. Manual wiping, sandblasting or cleaning can be used to ensure that the surface of the workpiece is dry, clean and free of debris. Secondly, according to the requirements of the non-coating parts of the workpiece, manually paste masking paper or install masking plates to prevent the non-coating parts from being contaminated with powder and ensure coating accuracy. Finally, check the appearance of the workpiece and confirm that there is no deformation or damage before preparing to enter the spraying link.

(II) Workpiece Positioning

Transfer the pre-treated large workpieces to the workpiece access channel of the manual large-scale powder coating booth through auxiliary equipment such as cranes and forklifts, and slowly place them on the special positioning bracket in the coating booth. The operator manually adjusts the position of the workpiece to ensure that the workpiece is placed stably and accurately positioned, with an appropriate distance from the spray gun (flexibly adjusted according to the workpiece size), so as to facilitate subsequent all-round spraying and avoid spraying dead angles. At the same time, check the ventilation and dust removal system in the coating booth, and close the coating booth door to prepare for spraying after confirming normal operation.

(III) Manual Powder Spraying

Turn on the powder supply system of the manual large-scale powder coating booth. The operator holds a special manual spray gun and manually adjusts the spraying pressure, powder dosage and spraying angle according to the size, shape and coating thickness requirements of the workpiece. Start from one end of the workpiece, move the spray gun at a constant speed, and perform all-round and uniform spraying on the surface of the workpiece. Focus on the detailed parts such as the corners, curved surfaces and joints of the workpiece to ensure that the coating is uniform, without missing spray, sagging or bubbles. During the spraying process, the operator can adjust the spraying rhythm at any time to adapt to the complex coating needs of large special-shaped workpieces and make up for the limitations of automatic spraying.

(IV) Powder Recovery

After the spraying operation is completed, keep the ventilation, dust removal and powder recovery systems in the coating booth running continuously to recover the excess powder not attached to the surface of the workpiece. The recovered powder can be reused after screening and filtering, which effectively reduces powder waste and production costs, and at the same time avoids powder dust accumulation, ensures a clean working environment, and meets the industry's environmental protection standards. After the powder recovery is completed, open the coating booth door to prepare for workpiece transfer.

(V) Workpiece Transfer

The operator slowly transfers the sprayed large workpieces from the coating booth to the manual curing oven through auxiliary equipment such as cranes and forklifts. During the transfer process, handle with care to avoid collision and scratch on the surface of the workpiece, so as to prevent coating peeling and damage. At the same time, manually remove the masking paper or masking plate on the workpiece, clean the excess powder on the surface of the workpiece to ensure that the surface of the workpiece is clean, and then transfer the workpiece to the manual curing oven.

(VI) Manual Curing

Manually adjust the position of the workpieces transferred to the curing oven to ensure that the workpieces are stably placed on the load-bearing bracket in the oven, and an appropriate distance is kept between the workpieces to ensure uniform distribution of heat in the oven. According to the powder type, workpiece material and coating thickness, the operator sets the appropriate curing temperature (usually 160-220℃, which can be flexibly adjusted) and curing time through the manual temperature control device, turns on the curing oven, and starts the curing operation. During the curing process, the operator needs to regularly observe the temperature control instrument to monitor the temperature in the oven, ensure the temperature is stable, and avoid problems such as insufficient local curing, coating peeling and color difference. After the curing is completed, turn off the curing oven and wait for the temperature in the oven to cool down to room temperature (or appropriate temperature) before taking out the workpieces.

(VII) Finished Product Inspection and Warehousing

Take out the cured and cooled workpieces from the curing oven and manually inspect the coating quality of the workpieces: check whether the coating is uniform, without missing spray, sagging, bubbles or peeling, whether the adhesion and corrosion resistance meet the process requirements, and whether the appearance has no obvious color difference or defects. The qualified workpieces are cleaned and sorted, then transferred to the finished product warehouse for warehousing; the unqualified workpieces need to have the surface coating cleaned, re-enter the pre-treatment link, and be sprayed and cured again until they are qualified.

III. Notes on the Process Flow

1. The workpiece pre-treatment must be thorough, and the surface must be free of oil stains, rust and dust, otherwise it will affect the coating adhesion and lead to subsequent coating peeling;

2. During the spraying process, the operator must wear appropriate safety protective equipment (masks, gloves, protective clothing, etc.) to avoid inhalation of powder dust and ensure personal safety;

3. The curing temperature and time must be strictly set according to the powder type and workpiece requirements, and shall not be adjusted at will to prevent insufficient curing or over-curing;

4. During the workpiece transfer process, handle with care to avoid collision and scratch, and protect the coating from damage;

5. Regularly clean the inner wall of the coating booth, spray gun and powder recovery system, and regularly check the thermal insulation performance and temperature control accuracy of the curing oven to ensure the normal operation of the equipment and the smooth progress of the process flow.