How should die casting factories ensure product quality?

Die casting is one of the most widely used and fast-growing processing and forming methods in the casting process. Die casting factories should pay special attention to product quality in the production process

Quality problems, thereby improving production efficiency and product quality. The following are common quality problems and troubleshooting measures in die-casting factories.

1. Bruises

Features: Scars on the surface of castings caused by impact.

Cause: Inadvertently bruised during gate removal, cleaning, calibration and handling.

Exclusion measures: Be careful when cleaning castings, store and transport castings, do not stack or bump into each other, and use special storage and transportation boxes.

2. Abrasion

Features: Along the demoulding direction, due to metal adhesion, the mold manufacturing slope is too small, which will cause the surface of the casting to be scratched. In severe cases, it will become a strain.

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Causes: 1. The casting slope of the core and the mold wall is too small or there is a reverse slope. 2. There are pressure marks on the core and wall. 3. Alloy adhesion mold.

4. The ejection of the casting is deflected, or the axis of the core is deflected. 5. The surface of the mold wall is rough. 6. The paint is often not sprayed.

Elimination measures: 1. Correct the mold to ensure the manufacturing slope. 2. Lighting indentation. 3. Reasonably design the gating system to avoid the metal flow against the core,

Type wall, reduce the filling speed appropriately. 4. Modify the mold structure. 5. Polish the surface. 6. The amount of paint should be thin and uniform, and the paint should not be missed.

3. Deformation

Features: Overall deformation where the geometry of the casting does not match the design requirements.

Causes: 1. Poor structural design of castings, causing uneven shrinkage. 2. The mold is opened too early, and the rigidity of the casting is not enough. 3. The casting slope is too large

Small. 4. Improper operation of taking and placing castings. 5. The position of the push rod is improperly arranged.

Elimination measures: 1. Improve the casting structure to make the wall thickness uniform. 2. Determine the best mold opening time to strengthen the rigidity of the casting. 3. Enlarge the casting slope.

4. Handle castings with care and with care. 5. The stacking of castings should be in a special box, and the method of removing the gate should be appropriate. 6. Some deformed castings can be finished

Shape elimination.

4. The chemical composition does not meet the requirements

Features: After chemical analysis, the casting alloy elements do not meet the requirements or there are too many impurities.

Causes: 1. The ingredients are incorrect. 2. Raw materials and recycled materials are put into use without analysis.

Elimination measures: 1. The charge should be chemically analyzed before it can be used. 2. Furnace materials should be strictly managed, and new and old materials should be used in a certain proportion. 3. Strict

Follow the smelting process. 4. Melting tools should be painted.

Five, the mechanical properties do not meet the requirements

Features: The mechanical strength and elongation of the casting alloy are lower than the required standards.

Causes: 1. The chemical composition of the alloy does not meet the standards. 2. There are air holes, shrinkage cavities, slag inclusions, etc. inside the casting. 3. The method of handling the sample is wrong

Wait. 4. The structure of the casting is unreasonable, which limits the casting to meet the standard. 5. Improper smelting process.

Exclusion measures: 1. Strictly control the chemical composition and impurity content in the melting of ingredients. 2. Strictly abide by the melting process. 3. Make samples according to the requirements.

During the production, the process test should be carried out regularly on the castings. 4. Strictly control the melting temperature and pouring temperature of the alloy, and try to eliminate various factors that cause the alloy to form oxides.