Selection of materials:
Sheet metal processing materials generally used in cold rolled sheet (SPCC), hot rolled sheet (SHCC), galvanized sheet (SECC, SGCC), copper (CU) brass, copper, beryllium copper, aluminum (6061, 6063, duralumin, etc.), aluminum profiles, stainless steel (mirror, brushed surface, matte surface). According to the role of the product is different, the choice of material is different, generally need to be considered from the product its use and cost.
1, cold rolled sheet SPCC, mainly with plating and baking paint parts, low cost, easy to mold, material thickness ≤ 3.2mm.
2, hot rolled sheet SHCC, material T ≥ 3.0mm, also with plating, baking paint parts, low cost, but difficult to mold, mainly with flat parts.
3, galvanized sheet SECC, SGCC. SECC electrolytic sheet divided into N material, P material, N material is not the main surface treatment, high cost, P material is used for spraying parts.
4, copper; mainly used in the conductive role of the material, its surface treatment is nickel-plated, chromium-plated, or do not deal with, high cost.
5, aluminum plate; generally use the surface chromate (J11-A), oxidation (conductive oxidation, chemical oxidation), high cost, silver plating, nickel plating.
6, aluminum profiles; complex cross-section structure of the material, a large number of boxes used in a variety of inserts. Surface treatment with aluminum.
7, stainless steel; mainly used without any surface treatment, high cost.
Face review:
To write the parts of the process, first of all, we need to know the various technical requirements of the parts map; the face of the audit is the most important part of the parts of the process of writing.
1, check whether the drawing is complete.
2, drawing view relationship, labeling is clear, complete, labeling size unit.
3, assembly relationship, assembly requirements key dimensions.
4, the difference between the old and new versions of the drawing.
5, translation of foreign language drawings.
6, table at the code conversion.
7. Feedback of drawing problems and burial.
8, materials.
9, quality requirements and process requirements.
10, the official release of drawings, must be stamped with quality control.
Sheet metal processing notes:
Expansion of the plan is based on the parts drawings (3D) to expand the plan (2D):
1, the expansion of the way to fit, to facilitate the saving of materials and processability.
2, reasonable choice of gap and wrapping method, T = 2.0 gap 0.2, T = 2-3 gap 0.5, wrapping method using a long side wrapped short side (door category).
3, reasonable consideration of the tolerance of external dimensions: negative difference to the end, positive difference to half; hole size: positive difference to the end, negative difference to half.
4, burr direction.
5, pumping teeth, pressure riveting, tearing, punching bumps (packages), and other location direction, draw a sectional view.
6, check the material, plate thickness to plate thickness tolerance.
7, special angles, bending corner radius (generally R = 0.5) to try to fold and determine the unfolding.
8, there are prone to error (similar to asymmetric) should focus on tips.
9, the size of more places to add an enlarged map.
10, need to be sprayed to protect the place shall indicate.
Sheet metal processing is a key technology that sheet metal technicians need to master, but also an important process of forming sheet metal products. It includes both the traditional cutting, punching and trimming, bending and pressure forming methods and process parameters, including a variety of cold stamping die structure and process parameters, a variety of equipment and operating principles, but also includes the new stamping technology and new technology.
Sheet metal processing is called sheet metal processing. Specific such as the use of sheet metal production chimneys, barrels, oil tanks, oil pots, ventilation pipes, elbows, elbows, sky, round, funnel-shaped, etc., the main process is to shear, bending, buckling, bending, welding, riveting, etc., requires a certain geometric knowledge. Sheet metal parts is sheet metal parts, that is, can be stamping, bending, stretching and other means to process the parts, a general definition is the thickness of the parts in the processing process remains unchanged.
Sheet metal equipment:
Relatively, casting parts, forging parts, machining parts, etc. usually refers to the metal cutting process, that is, the use of cutting tools from the metal material (blank) or workpiece to remove excess metal layer, so that the workpiece to obtain a certain shape, dimensional accuracy and surface roughness of the processing method. Such as turning, drilling, milling, planing, grinding, broaching and so on. In metal technology, with the hot processing, cold processing refers to the lower than the recrystallization temperature to produce plastic deformation of the metal processing technology, such as cold rolling, cold drawing, cold forging, stamping, cold extrusion, etc.. Cold working deformation resistance, in the metal forming at the same time, you can use work hardening to improve the hardness and strength of the workpiece, but will make the plasticity reduced. Cold working is suitable for processing small cross-section size, processing size and surface roughness requirements of high metal parts.