1. Cutting process
After receiving the drawings, go to the warehouse to pick up materials according to the requirements of the drawings. Before cutting the boards, use a tape measure to measure the front and back of the shearing machine. Make sure to adjust the thickness of the board. 1:0.8 of the plate thickness).
When cutting the first piece, do a self-inspection, measure the length and width with a tape measure to see if the burr meets the requirements of the drawing, and check each other again to see if it meets the requirements of the drawing and process. After meeting the requirements of the drawing, you can continue cutting.
When cutting the material, try to keep it light and put it down neatly.
When the number of cutting boards is greater than 20 cuts, self-inspection and mutual inspection are performed halfway, and the length and width are measured with a ruler. If there is no change to meet the drawing requirements, continue blanking until the end.
At the end, a final inspection is required to check the length, width, thickness and quantity according to the drawings. After there is no error, transfer the neatly arranged material sheets and drawings to the next process with a flat cart.
2. CNC machining process
After receiving the cut sheets and design drawings, check whether the drawings and the cut sheets meet the requirements on the drawings, and then start to select the turret punch mold according to the drawings, and carry out programming processing.
For the mold on the turret punch machine, it is necessary to pay attention to the level and vertical of the mold, and the mold handle of the upper mold and the pressure plate of the lower mold must be locked.
After the mold is installed, set the backing according to the size of the drawing, and start punching and opening corners. After punching a piece, self-check and mutual check according to the drawing, and continue processing after confirming that it is correct.
If the thickness of the plate is > 3.0mm, it cannot be processed on a turret punching machine, and must be drilled by a fitter. Mark the line according to the size of the drawing, punch the foreign punch, choose the same drill bit according to the hole diameter on the drawing and grind it, install it on the bench drill or pistol, and start drilling. When drilling the first piece, perform a self-inspection according to the diagram to see if there is a burr in the drilled hole. If there is a burr, remove the drill bit and grind it again until the drilled hole is free of burrs before continuing to process.
If the plate thickness is > 3.0mm, it cannot be processed on a turret punching machine, and must be processed by a normal punching machine. When the number of punching, corner cutting, and drilling is greater than 20 punches, a self-inspection and mutual inspection is required midway. After the punching, angle opening and drilling are all completed, check the size and processing quantity of the parts according to the drawing.
After the metal CNC machining is completed, the flat trolleys are placed neatly and handed over to the next process, the bending process, together with the design drawings.
3. Bending forming process
After receiving the incoming materials and design drawings of the previous process, first check whether the drawings and incoming materials match, and then start bending and forming.
The main tool for bending is a hydraulic bending machine. According to the thickness, length, width and bending degree of incoming materials and drawings, according to the bending comparison parameter table of the bending machine, select upper/lower molds of different specifications. When installing the upper/lower mold, two people must align the upper/lower mold on both sides of the hydraulic press, and then lock the upper/lower mold. After installation, try the bending depth first with the scrap, and whether the angle meets the requirements. If it does not meet the requirements, adjust the upper/lower mold.
When bending the first piece of material, it is also necessary to perform self-inspection and mutual inspection once according to the diagram, and continue bending once the requirements are met.
When the number of bends is greater than 20 cuts, it is necessary to check and check once according to the drawing. After all the bending is completed, check again against the drawing. After the self-inspection, mutual inspection, and special inspection are confirmed to be qualified, it will be transferred to the next process together with the design drawings.
4. Welding process
After receiving the bent incoming materials and design drawings, first check whether the drawings match the incoming materials according to the drawings, and then start welding.
Welders must have a welding qualification certificate issued by the labor department before they can work on the job. The main tools for welding are electric welding machines, oxygen welding machines, spot welding machines, and polishing machines.
According to the drawings, thickness, strength requirements and welding process of incoming materials, electric welding machines or spot welding machines with different currents are selected, and electric welding electrodes or oxygen welding electrodes of different specifications are equipped for welding.
When welding, place the materials in a custom-made or temporary fixture and metal weld a cabinet frame. After taking it out, use a ruler to measure whether the width, height and depth of the cabinet body are within the tolerance range, and then measure whether the top and bottom are within the tolerance range. within range. Then check whether the cabinet frame is welded evenly, without missing welding and without slag inclusion.
After confirming that there are no welding defects, start to remove the welding skin and knock out the slag, and then use a grinder to smooth and polish, carefully check the technical requirements according to the drawing requirements, and weld the second cabinet frame after confirming that it is correct.
After each cabinet is welded, it must be self-inspected. Mutual inspection once, after all the welding is completed, the sheet metal director will organize the welder to arrange all the cabinets neatly, and finally check whether all the cabinets are arranged according to the diagram, check the arrangement of cabinets Whether the frame is tilted, whether the overall cabinet frame has missing welding, missing slag knocking, missing grinding, and missing polishing.
Welders must pay attention to the welding and position of the conventional accessories of the cabinet (grounding screws, door harness brackets, line bending plates, lock rod brackets, etc.), and communicate with the designer in time if there is any omission on the design drawing to avoid There is rework after spraying.
After the welding is completed, after the self-inspection and mutual inspection according to the drawings, all the drawings will be sent to the quality inspection department. process.
5. Surface treatment process
After passing the acceptance by the quality inspection department, the sheet metal workshop will send the sheet metal fabrication cabinet or parts to the company for spraying. Or the supply department sends it out for electroplating for surface treatment.
Plastic spraying of the finished cabinet body: This step must be strictly implemented due to the control of professional operation specifications.
According to the user’s requirements, the color and powder spraying model of the finished or semi-finished products that need to be processed are determined according to the contract requirements;
After the surface treatment is completed and before the assembly workshop accepts it, conventional acceptance measures are generally taken to determine the quality. The acceptance of the project is mainly to check the quantity, check whether the color is consistent with the contract color, and check whether there are obvious defects in the spraying effect.
Electroplating is outsourced processing, and quality inspectors should check the overall appearance. If there are improperly processed defects on the sheet, including uneven spraying, insufficient thickness, insufficient temperature, discoloration, and bruises, etc., the outsourcer is required to rework.