CNC Machining: Common Defects in Appearance Parts and Metal CNC Machining Parts

First, the appearance of CNC machining parts is common.

1. Fuel injection parts; (common process, primer + UV paint, primer + PU paint)

Scratches: There are scratches on the surface.

Oil accumulation: It is easy to accumulate a layer of oil on the parting surface, screw column and end surface.

Color difference: It is related to the material, primer, environment when spraying, etc.

Fingerprints: There are fingerprints on the surface.

Dirt: black spots, hairs, hairs, etc.

Lack of silk screen, silk screen crooked.

Orange pattern: The surface is as uneven as the surface of an orange.

Commonly used inspection methods for incoming materials: 100 grid test.

2. Paint CNC machining parts;

Scratches: There are scratches on the surface.

Color difference: The spray paint is uneven, or the paint is not adjusted properly.

Commonly used detection methods for incoming materials: alcohol adhesion and wiping.

3. Laser engraving CNC machining parts: scratched, dirty, deformed. Offset, burnt, chromatic aberration. Holes, hyphenation, missing carvings.
 

Second, the commonly used method of metal CNC machining parts.

1. Mechanical CNC machining;

a. Use turning, drilling, planing, milling, grinding, wire cutting and other means to CNC process raw materials into finished products. Suitable for all kinds of metal CNC machining parts,

In the processing of sheet metal, box body, and metal structure, for example, in the process of mold manufacturing, the copper male is machined first, and then the copper male is processed by EDM on the mold core.

b. Machining is divided into manual machining and numerical control machining (CNC), and CNC can be divided into machining centers (CNC milling machines), CNC lathes, wire cutting, EDM, etc.

2. Die casting mold

Die-casting molds are similar to plastic molds in that they are both cavity injection molding processes, but only metal raw materials are injected. Such as magnesium alloy process, zinc alloy process and so on.

3. Powder metallurgy

The figure below shows the process of powder metallurgy, and there are obvious graininess and bonding lines on the surface of powder metallurgy products.

4. Stamping

The stamping process is shown in the figure, which is a common process method for sheet metal CNC machining.