钣金工艺（Sheet metal process）

1、钣金工艺（Sheet metal process）Sheet metal processCatalogThe definition of sheet metalWorkpiece blanking expansionThe definition of sheet metalWorkpiece blanking expansionEdit this paragraphThe definition of sheet metalSheet metal so far there is not a complete definitionAccording to a definition of a for

2、eign professional journals can be defined as: sheet metal in sheet metal (usually below 6mm) a cold working process, including cutting, punching / cut / composite, folding, welding, riveting, assembly, molding (such as auto body). Its remarkable feature is the same thickness of the same parts.Sheet

3、metal sometimes also pull, the word comes from English platemetal, is generally some sheet metal stamping die by hand or to produce plastic deformation, the formation of the desired shape and size, and further to form more complex parts through a small welding or machining, such as chimney, commonly

4、 used in life scale furnace, car plates are the pieces of shell.Sheet metal processing called sheet metal processing. For example, the specific use of sheet metal production of chimney, bucket, tank Youhu, ventilation pipe, elbow reducer, park days, funnel-shaped, the main process is shear, bending,

5、 bending, buckling edge welding, riveting, requires a certain knowledge of geometry.Sheet metal pieces of hardware that is thin, that can be processed through stamping, bending, stretching and other means of parts, a broad definition is:In the process of constant thickness parts. Corresponds to the

6、casting parts, forging parts, machining parts, such as the car outside the Tieke sheet metal pieces, made of stainless steel kitchenware is some pieces of sheet metal.The 1. is a processing method of vehicle maintenance, also called cold.Frankly, if the appearance of the body damage and deformation,

7、 we need to restore the original appearance of the sheet metal process.Basically is a hammer. Different shapes in sheet metal hammer, back cushion block, repeatedly beat, so forming.When necessary to use the appearance of repair. This thing is actually belongs to welding. The hoop welding on the bod

8、y, with a hook to pull. For the repair of the concave part.A large area of flat body is generally difficult to get, so sometimes also used the fire. Is the local heating and cooling, the iron shrinkage.The ultimate goal is to restore the damaged body.2.: the sheet metal sheet, plate, sheet of Italy,

9、 is a series of processing means of sheet metal thin, including folding, shear, punching, welding, riveting, assembly process3. this is a design module, is mainly used for metal materials to do stuff. He is not the same as with entity, entity thickness changes, but the sheet metal is basically the s

10、ame thickness, there are many made of sheet metal products in life.Sheet metal equipmentGeneral use sheet metal basic equipment including shears (Shear, Machine) (CNC Punching Machine) CNC punch / plasma, laser and water jet cutting machine (Laser, Plasma, Waterjet, Cutting / Machine) composite mach

11、ine (Combination Machine), bending machine (Bending Machine) and various auxiliary equipment such as: decoiler, school flat machine, deburring machine, welding machine etc.Sheet metal processUsually, the three most important steps of sheet metal factory is cutting, cutting, folding / punching.Includ

12、ing the modern sheet metal process: filament winding, laser cutting, processing, heavy metal bonding, metal drawing, plasma cutting, precision welding, roll forming, sheet metal forming, forging, water jet cutting, precision welding etc.At present, the software of 3D, SolidWorks, UG, Pro/E, SolidEdg

13、e, TopSolid all have a sheet metal parts, mainly through the 3D graphics editing and sheet metal processing required data (such as drawing, bending line etc.) as well as the CNC punch (CNC Punching Machine) / laser, plasma, water jet cutting machine (Laser, Plasma, Waterjet, Cutting / Machine) compo

14、site machine (Combination Machine) and CNC bending machine (CNC Bending Machine) to provide data.Sheet metal quality inspectionThe quality of sheet metal parts in addition to the strict requirements in the production process, quality inspection is independent of production, is strictly according to

15、the drawings size two is strictly the appearance quality, the size of inconsistent repair or scrap processing, the appearance is not allowed to touch the scratch, after spraying color, corrosion resistance, adhesion we test. So you can find out errors in process of bad habits in the process of error

16、, such as punching mold programming error, error.Sheet metal process code1. scope of applicationShear material blank line edge 1.1. This code applies to all kinds of black metal and other similar material.1.2 cut the size of 0.5 basic material thickness to 6 mm, the maximum width of 2500 mm.2. mater

17、ials2.1 materials should meet the technical requirements.2.2 material for cold rolled steel, with serious surface abrasions, scratches, impurities, rust is not allowed.3. equipment and process equipment and tools.3.1 board, pliers, screwdriver, hammer, oiler.3.2 vernier caliper, micrometer, steel ta

18、pe, steel ruler, square, stylus.4. preparation4.1 familiar with the drawings and relevant technical requirements, to fully understand the size and shape of parts processing requirements.4.2 according to the drawing requirements of material and material specifications, check whether the material meet

19、s the technological requirements.4.3 in order to reduce consumption, improve the utilization rate of materials, to adopt reasonable calculation method of cutting.4.4 qualified materials neatly stacked in machine tool.4.5 to the oil hole gas cutting machine.4.6 check whether the sharp blade shears an

20、d firm fastening, and the thickness of the blade gap adjustment board.Sheet metal processEdit this paragraphWorkpiece blankingAfter the hand drawing, blanking mode according to the different choices of expansion graph and batch is different, including laser, CNC punching, shearing mould, etc., and t

21、hen make the appropriate deployment according to drawings. Affected by the CNC punch tool, machining for some irregular workpieces and irregular holes, on the edge of a larger burr and deburring processing to be carried out later, also has certain influence on the precision of the workpiece; laser m

22、achining tool, surface formation, suitable for processing special-shaped workpiece, but for small the workpiece is time-consuming. Place the table in the numerical control and laser next to plate material is placed in the machine, reduce the workload of lifting plate.Some can use the material placed

23、 in the designated place, provide materials for bending test. In the blanking, edge, burr, contact the necessary dressing (polished), the tool junction, trimmed with a flat file, for larger workpieces burr grinding machine with trim, small file trimming corresponding with a small hole in the junctio

24、n, in order to ensure the appearance of the beautiful. At the same time the shape of the dressing is made to ensure the bending position, the bending position in the workpiece by bending machine, guarantee the same batch of product size consistent.The next stepThe blanking is completed, into the nex

25、t process, according to different workpiece processing requirements into the corresponding process. A riveting, bending, flanging tapping, spot welding, a convex hull, segment difference, sometimes in one or two after bending the nut or stud pressure, which has a die. The convex hull and the poor pl

26、ace to consider the first processing, lest other processes will occur after the first processing interference, unable to complete the required processing. A hook in the upper or lower crust, such as bending can not touch welding in bending before processing.Bending to first according to the drawings

27、 on the size of the cutter and knife groove bending the material thickness determined by the product and tool, avoid collision caused by deformation is the key on the mode selection (in the same product, may use different types of mold, mold selection) is determined according to the sheet thickness.

28、 The second is to determine the order of bending, bending is the general rule after the first period, from small to large, after the first special general. Have to edge the workpiece on workpiece bending to 30 degrees, 40 degrees, and then the workpiece crushed with leveling die.Pressure riveting, d

29、ie height selection should consider the stud different, and then the pressing pressure is adjusted to ensure the stud and the workpiece surface, avoid stud not fastened or extruded over the workpiece surface, causing the workpiece scrapped.Welded with argon arc welding, spot welding, carbon dioxide

30、welding, manual arc welding, spot welding should first consider welding position in batch production considering positioning tooling to ensure accurate welding position.In order to welding firm, hit a bump in the workpiece to be welded, can make the bump in electricity before welding and flat unifor

31、m contact, in order to ensure the heating, but also can determine the welding position, the same, to carry out welding, to adjust the preloading time, holding pressure time, maintenance time stop time, ensure the workpiece can be spot welded firmly. After spot welding welding scar will appear on the

32、 surface of the workpiece, with flat mill processing, arc welding is mainly used for two large workpiece, but also connected together, or a workpiece edge processing, achieve the workpiece surface smooth, smooth. The generation of welding heat easilyThe deformation of the workpiece after welding to

33、grinding machine with peace mill processing, especially the corners are.surface treatmentThe workpiece in bending, pressure riveting process after surface treatment, different ways of handling the surface of the plate, cold plate processing after surface plating, plating after no spray treatment, is

34、 used for phosphating, phosphating after spraying treatment. Plating surface cleaning, degreasing, and then spraying. Stainless steel plate (with a mirror panel, fog panel, wire drawing board) is carried out in bending before can be brushed, without spraying,If you need to spray for wool processing;

35、 aluminum by oxidation treatment, according to the different color spraying different color selective oxidation,The commonly used black and grey oxidation; aluminum spraying of chromate oxidation treatment after spraying. This enables the clean surface treatment surface, significantly improve the ad

36、hesion of coating can improve the corrosion resistance of the film, double. The cleaning process before cleaning the workpiece, the workpiece hanging on the line, the first after the cleaning solution (alloy oil powder), and then into the water, then through the spray zone, after drying, the workpie

37、ce is removed from the pipeline.Spray treatmentThe surface treatment, into the spraying process, the workpiece assembly after spraying, tooth or part of conductive holes need protection.Protective treatmentCheck into the soft tooth hole rod or screw, need to protect the conductive tape with high tem

38、perature, large quantities of the positioning fixture positioning protection, so when spraying can not spray to the workpiece, the nut on the outer surface of workpiece can see (flanging) protection with screw hole, so as to avoid spraying the workpiece the nut (flanging) hole to back teeth.Some lar

39、ge quantities of workpiece fixture is also used to protect;The workpiece assembly when spraying without spraying area with high temperature resistant adhesive tape and disk block nut hole exposed high temperature resistant rubber protection with screws or. Such as the workpiece double-sided spraying, using the same method (Luo Zhu) to protect the nut hole; small workpiece with wire clips or other items are strung together after spraying the surface of the workpiece; some requirements, before spraying to ash scrapin