According to the first chapter of Luo Qiquan's Practical Manual of Die Casting Technology and Equipment Mould:

Surface wrinkling: Irregular wrinkles formed on the product surface, mainly at the front end, with thin wall.

Wrinkling: the cylindrical part near the insert, that is, the wrinkled surface of the surface film, changes according to the occurrence state.

Step 2: Solutions

According to the first chapter of Luo Qiquan's Practical Manual of Die Casting Technology and Equipment Mould:

Solution to surface wrinkling: completely exhaust and remove excess release agent. Adjust the position of high-speed and high-pressure area to prevent the solution from cooling down;

Wrinkling solution: it is very important to preheat the mold and produce it at a set temperature, and set the mold temperature in a suitable range.

Extended data:

Code for design of die casting machine

The design of die casting must consider seven aspects: the wall thickness of die casting, the casting fillet and demoulding inclination of die casting, reinforcing ribs, the minimum distance between casting holes and holes in die casting, rectangular holes and grooves in die casting, inserts in die casting and machining allowance of die casting.

1, code for design of cast fillet

Usually, all parts of the die casting should have rounded corners (except the parting surface), which can make the metal flow smoothly during mold filling, the gas can be easily discharged, and the cracks caused by acute angles can be avoided. For die castings that need electroplating and coating, the fillet can be coated evenly to prevent coating from accumulating at sharp corners. Generally, the fillet radius r of die casting should not be less than 1mm, and the minimum fillet radius is 0.5 mm. ..

2. Design specification for die casting inserts

First of all, the number of inserts on die casting should not be too large; Secondly, the connection between the insert and the die casting must be firm, and the insert should have grooves, protrusions and knurling. Thirdly, the insert must avoid sharp corners, so as to facilitate the placement and prevent the stress concentration of the casting. If there is serious electrochemical corrosion between the casting and the insert, the surface of the insert needs electroplating protection;

Finally, heat treatment should be avoided for castings with inserts to avoid volume changes caused by phase transformation of two metals and loose inserts.

3. Design specification for wall thickness of die casting parts

Thin-walled die castings have higher strength and better compactness than thick-walled die castings. In view of this, the design of die casting should follow the principle that the wall thickness should be reduced as much as possible and kept uniform on the premise of ensuring sufficient strength and stiffness of the casting.

Practice has proved that the wall thickness of die-casting parts is generally 2.5-4mm, and parts with wall thickness exceeding 6mm are not suitable for die-casting production. The influence of too thick and too thin wall of die casting on the quality of casting: too thin wall of casting and poor metal welding directly affect the strength of casting and make it difficult to form;

When the wall is too thick or seriously uneven, it is easy to produce shrinkage and cracks. On the other hand, with the increase of wall thickness, the defects such as porosity and shrinkage porosity in castings also increase, which will also reduce the strength of castings and affect the quality of castings.

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