What are the technological steps of sheet metal processing?

Material selection:

The commonly used materials for sheet metal processing are cold-rolled sheet (SPCC), hot-rolled sheet (SHCC), galvanized sheet (SGCC SECC), copper (CU), brass, red copper, beryllium copper, aluminum plate (606 1, 6063, hard aluminum, etc. ), aluminum profile, stainless steel (mirror surface, wire drawing surface, fog surface, etc.).

1, cold-rolled plate SPCC, mainly used for electroplating and baking paint, with low cost, easy molding and material thickness ≤ 3.2 mm

2. Hot-rolled SHCC, the material of which is T≥3.0mm, is also baked by electroplating, with low cost, but it is difficult to form, mainly using flat parts.

3.SECC and SGCC galvanized sheets. SECC electrolytic plate is divided into N material and P material. N material is mainly without surface treatment and has high cost, while P material is used for spraying parts.

4. copper; Conductive materials are mainly used, and their surface treatment is nickel and chromium plating, or no treatment, which is costly.

5, aluminum plate; Generally, surface chromate (J 1 1-A) and oxidation (conductive oxidation and chemical oxidation) are used, which are costly, including silver plating and nickel plating.

6. Aluminum profiles; Materials with complex cross-sectional structure are widely used in various boxes. Surface treatment is the same as aluminum plate.

7. Stainless steel; It is mainly used without any surface treatment and has high cost.

Drawing review:

To write the process flow of parts, we must first know the various technical requirements of part drawings; Then drawing review is the most important link in the preparation of part process flow.

1, check whether the drawings are complete.

2, the drawing view relationship, whether the label is clear and complete, and the size unit.

3, the assembly relationship, assembly requirements focus on size.

4, the difference between the old and new layout.

5. Translation of foreign language drawings.

6, table code conversion.

7. Feedback and burying of drawing problems.

8. materials.

9. Quality requirements and process requirements.

10. When the drawings are officially released, the quality control seal must be affixed.

Matters needing attention in sheet metal processing:

The developed drawing is a plan (2d) developed according to the part drawing (3D);

1, the expansion mode should be combined, and it is convenient to save materials and processability.

2. Reasonably select the clearance and edging mode, the clearance below T=2.0 is 0.2, and the clearance between T=2-3 is 0.5. The wrapping method adopts long side and short side (door panel).

3. Reasonable consideration of tolerance size: negative difference to the end, positive difference to half; Hole size: positive difference to the end, negative difference to half.

4. Burr direction.

5, tooth extraction, riveting, tearing, punching bump (bag) and other positions, draw a sectional view.

6, check the material, thickness, thickness tolerance.

7. For special angles, the inner radius of the bending angle (generally R=0.5) should be enlarged according to the trial bending.

8, easy to make mistakes (similar to asymmetry) should focus on tips.

9. The scale of more places should be enlarged.

10. The places that need spray protection shall be marked.

Sheet metal processing is a key technology that sheet metal technicians need to master, and it is also an important process of sheet metal product forming. It includes not only the traditional methods and process parameters of cutting, blanking, punching, bending and stamping, but also the structure and process parameters of various cold stamping dies, the working principles and operation methods of various equipment, as well as new stamping technologies and processes.

Sheet metal processing is called sheet metal processing. Specifically, such as making chimneys, iron drums, oil tanks, oil pots, ventilation pipes, elbows, round places, funnels, etc. Through the use of plates, the main processes are cutting, bending, forming, welding, riveting and so on. This requires a certain knowledge of geometry. Sheet metal parts are sheet metal parts, that is, parts that can be processed by stamping, bending and drawing. The general definition is a part with constant thickness during machining.

Sheet metal equipment:

Accordingly, castings, forgings, machined parts, etc. Usually refers to metal cutting, that is, using cutting tools to remove the redundant metal layer on metal materials (blanks) or workpieces, so that the workpieces can obtain certain shape, dimensional accuracy and surface roughness. Such as turning, drilling, milling, planing, grinding and broaching. In metal technology, corresponding to hot working, cold working refers to the processing technology that causes metal plastic deformation below recrystallization temperature, such as cold rolling, cold drawing, cold forging, stamping, cold extrusion and so on. Cold working deformation resistance is large. When forming metal, work hardening can be used to improve the hardness and strength of the workpiece, but it will reduce the plasticity. Cold working is suitable for machining metal parts with small cross-section size and high requirements for machining size and surface roughness.