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Precision sheet metal processing technology

Update:08-11-2017
Summary:

First: After the drawing is done, different ways of bla […]

First: After the drawing is done, different ways of blanking are selected according to different plans and batches, including laser, CNC punch press, cutting board, mold and so on, and then make corresponding expansion according to the drawings.

CNC punch by the impact of the tool, for some irregular shaped workpieces and holes, there will be a large margin in the edge of the burr, deburring to be dealt with later, while the accuracy of the workpiece have a certain impact;

Laser processing tool-free restrictions, cross-section smooth, suitable for processing of shaped parts, but for the longer processing of small parts.

Placed in the CNC and laser next to the workbench, which will help plate placed on the machine for processing, reducing the workload of lifting plate.

Some available edge material is placed at designated locations to provide material for the bend test.

Second: the workpiece blanking, the corners, burrs, contacts to carry out the necessary dressing, at the tool joints, with a flat file dressing, burr larger workpiece with a dressing machine for dressing,

A small hole at the junction with the corresponding small file trimming, to ensure the appearance of the beautiful, while the shape of the trim is also made for the positioning of the bend made to ensure that the bending of the workpiece by the same position on the bending machine to protect the same batch of products The same size.

Third: After the blanking is completed, enter the next process, different parts according to the processing requirements into the corresponding process.

There are bending, riveting, tapping tapping, spot welding, convex hull, paragraph difference, and sometimes in the bend one or two after the nut or stud should be a good pressure, including mold punch convex and the difference should be considered First processing,

So as not to interfere with other processes after the first processing, can not complete the required processing. When there is a hook in the upper cover or the lower cover, it can not be touched and welded before bending.

Fourth: Bending the first to be based on the size of the drawings, the thickness of the material used to determine the bending tools and sipes to avoid collision with the product caused by the deformation of the mold is the key to the choice of mold, the choice of mold according to the plate Thickness to determine.

The second is to determine the order of bending, bending the general rule is first inside and outside after the first small, the first special after ordinary. The workpiece that is to be crushed is first bent to 30 ° -40 °, then the workpiece is crushed with a leveling die.

Riveting, to consider the height of studs choose the same different mold, and then adjust the pressure of the press to ensure that the stud and the workpiece surface flush, to avoid the stud is not pressed firmly or out of the workpiece surface, resulting in the workpiece scrapped.

Fifth: Welding with argon arc welding, spot welding, carbon dioxide protection welding, manual arc welding, spot welding first consider the location of workpiece welding, mass production, consider making positioning tooling to ensure accurate spot welding position.

In order to weld firmly, in the workpiece to be welded to play bumps, bumps can be connected evenly with the flat before welding, in order to ensure that the heating of the same point, but also to determine the welding position,

 Similarly, to be welded, to be good pre-pressure time, dwell time, maintain time, rest time, to ensure that the workpiece can be spot welding firm. After welding spot welding surface will appear in the workpiece,

To be treated with a flat grinder, sub-arc welding is mainly used for two larger workpieces, but also connected together, or a corner treatment of the workpiece to the workpiece surface smooth, smooth.

Sub-arc welding heat generated easily lead to deformation of the workpiece, after welding with grinding machine and grinding machine for processing, especially more corner.

Sixth: the workpiece after bending, riveting and other processes to be completed after the surface treatment, the treatment of different plate surface is different from the cold plate after the general surface plating, after plating is not spray treatment,

Used for phosphating, phosphating after spraying treatment. Electroplating board surface cleaning, degreasing, and then spraying.

Stainless steel plate is carried out before the bend can be brushed, without spraying, spraying for hair to be dealt with;

Aluminum oxide generally used, according to the different colors of spray choose different oxidation background, commonly used in black and natural oxidation;

Aluminum spray coating for chromate oxidation after spraying. Pre-surface treatment to do so can make the surface clean, significantly improve the coating adhesion, can double the corrosion resistance of the coating.

Cleaning the process of cleaning the workpiece, the first workpiece hanging in the pipeline, first after cleaning solution,

And then into the water, followed by the spray area, and then through the drying area, and finally the workpiece removed from the assembly line.

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