Under the requirement of meeting the function and appearance of the product, the design of sheet metal should ensure that the stamping process is simple, the stamping die is easy to make, the quality of sheet metal stamping is high, and the dimensions are stable. Detailed guidelines for sheet metal design can be found in "Structural Design Processability of Parts" and "Manufacturing and Assembly Oriented Product Design Guide" published by Machinery Industry Press. After the drawings are in hand, according to the unfolding drawings and batch selection of different drop ways, which are laser, CNC punch, shear plate, mold and other ways, and then make the corresponding unfolding according to the drawings. CNC punch press is affected by the tool, for some shaped workpieces and irregular hole processing, there will be a large burr at the edge, to carry out the later deburring process, while the accuracy of the workpiece has a certain impact; laser processing without tool restrictions, the cross-section is flat, suitable for the processing of shaped workpieces, but for the processing of small workpieces time-consuming and long. In the CNC and laser placed next to the worktable, conducive to the plate placed on the machine for processing, reducing the workload of lifting the plate.
Some of the edges that can be used are placed in a designated place to provide material for the test mold when bending. In the workpiece after the drop, corners, burrs, joints to carry out the necessary trimming (sanding process), in the tool joints, with a flat file for trimming, for burrs larger workpieces with sanding machine for trimming, small bore joints with the corresponding small file trimming to ensure that the appearance of the appearance of the beautiful, and at the same time the shape of the trimming is also for the positioning of the bending made to ensure that bending the position of the workpiece leaning in the bending machine to protect the same batch of products of the same size. The same batch of products of the same size.
After the completion of the drop, into the next process, different workpieces according to the requirements of processing into the corresponding process. There are bending, pressure riveting, flanging tapping, spot welding, playing convex package, section difference, sometimes in the bending of one or two after the nut or stud pressure, which has a mold to play convex package and the section difference of the place to consider the first processing, so as not to interfere with the other processes will occur after the first processing, can not complete the processing required. In the upper cover or lower shell on the card hook, such as bending can not touch the welding to be processed before bending.
Bending should first be based on the size of the drawings, the thickness of the material to determine the bending of the tool and knife groove, to avoid the product and the tool collision caused by deformation is the key to the selection of the upper mold (in the same product, you may use a different model of the upper mold), the selection of the lower mold according to the thickness of the plate to determine. Next is to determine the sequence of bending, bending the general law is the first inside after the outside, the first small after the big, the first special after the ordinary. Have to press the dead edge of the workpiece will first bend the workpiece to 30 ° - 40 °, and then use the leveling die to press the workpiece dead.
Press riveting, to consider the height of the stud to choose the same different molds, and then adjust the pressure of the press to ensure that the stud and the surface of the workpiece is flush, to avoid the stud is not pressed or pressed out more than the surface of the workpiece, resulting in workpiece scrap.
Welding has argon arc welding, spot welding, carbon dioxide shielded welding, manual arc welding, etc., spot welding first to consider the position of the workpiece welding, in mass production, consider doing positioning tooling to ensure that the spot welding position is accurate.
In order to weld firmly, the workpiece to be welded on the bumps, can make the bumps in the electric welding before the uniform contact with the plate to ensure that the points of the heating of the same, but also to determine the welding position, the same, to be welded, to adjust the pre-pressure time, holding time, maintenance time, rest time, to ensure that the workpiece can be welded firmly. Spot welding will appear on the surface of the workpiece weld scars, to be processed with a flat grinder, argon arc welding is mainly used for two workpieces larger, but also to be connected together, or a workpiece edges to deal with, to achieve the surface of the workpiece is flat, smooth. Argon arc welding when the heat generated by the workpiece is easy to make deformation, after welding to use the grinding machine and grinding machine to deal with, especially in the corners more.
Workpiece in the bending, riveting and other processes to be carried out after the completion of the surface treatment, the surface of different panels in different ways, cold plate processing is generally carried out on the surface of the plating, plating is not carried out after the spray treatment, the use of phosphate treatment, phosphate treatment to be carried out after the spray treatment. Plating plate surface cleaning, degreasing, and then spraying. Stainless steel plate (mirror plate, matte plate, brushed plate) is carried out before bending can be brushed without spraying, such as the need for spraying to carry out hair treatment; aluminum plate is generally used in oxidation, according to the spraying of different colors to choose a different oxidation of the primer color,
Commonly used black and color oxidation; aluminum plate to be sprayed for chromate oxidation treatment and then spraying. Surface pre-treatment can make the clean surface, significantly improve the adhesion of the coating film, can exponentially improve the corrosion resistance of the coating film. The process of cleaning the workpiece first, first hang the workpiece on the assembly line, first through the cleaning solution (alloy degreasing powder), and then into the water, followed by the spraying area, and then through the drying area, and finally remove the workpiece from the assembly line.
After the surface pretreatment, into the spraying process, in the workpiece requires assembly after spraying, teeth or part of the conductive holes need to be protected to deal with the tooth holes can be inserted into the soft rubber rod or screwed into the screw, need to protect the conductive to be affixed with high-temperature tape, large quantities of the positioning tooling to locate the protection so that spraying will not be sprayed to the inside of the workpiece, the workpiece can be seen in the outer surface of the nut (flap) holes in the protection of the screw, so as not to be sprayed to the workpiece nut (flap) holes, to protect the workpiece nut (flap) holes. In order to protect the nut (flange) hole of the workpiece visible on the outside surface with a screw, so as to avoid the need to return to the teeth after spraying the workpiece nut (flange) hole.
Some large quantities of workpieces are also used to protect the workpiece; workpieces are not assembled when spraying, do not need to spray the area with high-temperature tape and paper blocking, some of the exposed nut (stud) holes with screws or high-temperature rubber protection. If the workpiece is sprayed on both sides, use the same method to protect the nut (stud) holes; small workpieces with a lead wire or a crankpin and other items scurrying together after spraying; some workpieces with high surface requirements, scrape the gray before spraying; some workpieces in the grounding of the charm with a special high-temperature stickers to protect. In the spraying, the first workpiece hanging in the assembly line, with the air hose to blow off the surface of the sticky dust. Into the spraying area spraying, after spraying along the assembly line into the drying area, and finally from the assembly line to take down the sprayed workpiece.
There are also two types of manual and automatic spraying, which use different equipment.
After spraying into the assembly process, before assembly, the original spraying in the protective sticker to tear off, to determine the parts of the internal threaded holes have not been sprinkled into the paint or powder, in the whole process, to wear gloves, to avoid the hands of the dust attached to the workpiece, and some of the workpiece should be blown clean with an air gun. After the assembly is good to enter the packaging process, the workpiece inspection into a special bag for protection, some do not have a special packaging of the workpiece with bubble wrap and other packaging, in the packaging before the bubble wrap can be packaged into the size of the workpiece, so as to avoid a side of the packaging side of the cut, affecting the speed of processing; batch of large quantities can be customized
specialized cardboard boxes or bubble bags, mats, trays, crates and so on. Packed into the carton, and then labeled with the corresponding finished or semi-finished products on the carton.
The quality of sheet metal parts in addition to the strict requirements in the production process, is the need for independent of the production of quality inspection, first, according to the drawings of the strict control of the size, and secondly, strict control of the appearance of the quality of the size does not match the person for repair or scrap processing, the appearance of the scratch is not allowed to touch the color difference between the spray, corrosion resistance, adhesion and other inspections. This can be found in the unfolding of the map error, bad habits in the process, process errors, such as the number of punching programming errors, mold errors and so on. ⒈ Scope of application
1 ⒈ This code applies to all kinds of ferrous metal straight edge material blanks shear and other similar undercutting.
⒈2 The basic dimensions of the material to be cut thick 0.5-6 mm, the maximum width of 2500 mm.
peak Material
peak 1 The material should meet the requirements of the technical conditions.
⒉2 The material is cold rolled steel plate, no serious surface abrasions, scratches, impurities, rust spots.
3 Equipment and process equipment, tools.
301 Plate, pliers, oil pot, screwdriver, hand hammer.
320 Vernier calipers, OD micrometers, steel plate rulers, steel tape measure, right-angled ruler, scribing needle.
⒋ Preparation
⒋1 Familiarize yourself with the drawings and process requirements, and fully understand the geometry and size requirements of the parts to be processed.
⒋2 Receive the material according to the drawing and check whether the material meets the requirements of the process.
Sung3 In order to reduce the consumption and increase the material utilization rate, it is necessary to calculate and adopt the method of sunglasses cutting.
Sung4 Stack the qualified materials neatly next to the machine.
sung5 refuel the oil holes of the shearing machine.
⒋6 Check whether the shearing machine blade is sharp and fastened firmly, and adjust the blade gap according to the thickness of the sheet
.