1. Analyze the process of the product according to the types of materials used in the product, the shape and accuracy of the product and other indicators, and set the process.
2. Determine the position of the product in the mold cavity, analyze and design the parting surface, overflow system and pouring system.
3. Design the core assembly and fixing methods of each activity.
4. Design of core pulling distance and force.
5. Design of ejector mechanism.
6. Determine the die-casting machine, design the mold base and cooling system.
7. Check the relevant dimensions of the mold and die-casting machine, and draw the process drawing of the mold and each part.
8. The design is completed

The FAQ Of Die Casting Mold

The control of the surface temperature of the die-casting mold is very important for the production of high-quality die-casting parts. Uneven or inappropriate die-casting mold temperature will also cause the size of the casting to be unstable, and the casting will be deformed during the production process, resulting in defects such as thermal pressure, mold sticking, surface depression, internal shrinkage and hot bubbles. When the mold temperature differs greatly, the variables in the production cycle, such as filling time, cooling time, and spraying time, will be affected to varying degrees.

1). Cold Pattern

Reason: The temperature at the front of the molten soup is too low, and there are traces when they overlap

Improve methods:

1. Check whether the wall thickness is too thin (designed or manufactured), and the thinner area should be directly filled
2. Check whether the shape is not easy to fill; it is not easy to fill if the distance is too far, enclosed areas (such as fins, bumps), blocked areas, and rounded corners are too small. And pay attention to whether there are ribs or cold spots
3. Shorten the filling time, the method of shortening the filling time
4. Change the filling mode
5. Ways to increase mold temperature
6. Increase melting temperature
7. Check the alloy composition
8. Enlarging the escape airway may be useful
9. Adding a vacuum device may be useful

2). Ccrack

the reason:

1. Shrinkage stress
2. Cracking under force during ejection or whole edge

way of improvement:

1. Increase fillet
2. Check for hot spots
3. Pressurization time change (cold room machine)
4. Increase or shorten the clamping time
5. Increase draft angle
6. Increase ejector pin
7. Check whether the mold is misaligned or deformed
8. Check the alloy composition

3). Stoma

the reason:

1. The air is mixed in the molten soup
2. Source of gas: when melting, in the material tube, in the mold, release agent

Improve methods:

• Moderately slow
• Check whether the turning of the runner is smooth and whether the cross-sectional area is gradually decreasing
• Check whether the area of ​​the escape airway is large enough, whether it is blocked, and whether the location is in the last filling place
• Check if the release agent is sprayed too much and the mold temperature is too low
• Use vacuum

4). Cavitation

Reason: Due to the sudden decrease in pressure, the gas in the molten soup suddenly expands, impacts the mold, and damages the mold.
Improve methods:

Do not change the cross-sectional area of ​​the runner rapidly

5). Shrinkage

Reason: When the metal solidifies from liquid to solid, the space occupied becomes smaller. If there is no metal supplement, shrinkage cavities will be formed, which usually occur in the place where the solidification is slower.

Improve methods:

1. Increase stress
2. Change the mold temperature. Local cooling, spray release agent, lower mold temperature,. Sometimes just change the position of the shrinkage hole, not the shrinkage hole

6). Peeling

the reason:

1. Poor filling mode, causing overlapping of molten soup
2. The mold is deformed, causing the molten soup to overlap
3. Inclusion oxide layer

Improve methods:

1. Switch to high speed early
2. Shorten filling time
3. Change the filling mode, gate position, gate speed
4. Check whether the mold strength is sufficient
5. Check whether the pin die device is in good condition
6. Check for inclusion of oxide layer

7). ripple

Reason: The first layer of molten broth cooled rapidly on the surface, and the second layer of molten broth failed to melt the first layer, but there was enough fusion, resulting in a different organization

Improve methods:

1. Improve filling mode
2. Shorten filling time

8). Holes caused by poor flow

Cause: The molten stock flows too slowly, or is too cold, or the filling mode is bad, so there are holes in the solidified metal joints
Improve methods:

1. The same method to improve cold lines
2. Check if the temperature of the molten soup is stable
3. Check whether the mold temperature charge is stable

9). Holes on the parting surface

Reason: It may be shrinkage or pores

Improve methods:

1. If it is shrinkage, reduce the thickness of the gate or the inlet of the overflow well
2. Cooling gate
3. If it is a pore, pay attention to the problem of exhaust or entrainment

10). Raw edges

the reason:

1. Insufficient clamping force
2. Poor mold clamping
3. Insufficient mold strength
4. Molten soup temperature is too high

11). Shrinkage

Reason: Shrinkage occurs below the surface of the pressing part
Improve methods:

• The same method to improve shrinkage
• Local cooling
• Heat the other side

12). Carbon deposit

Reason: Release agent or other impurities accumulate on the mold.
Improve methods:

1. Reduce the amount of release agent sprayed
2. Increase mold temperature
3. Choose the right release agent
4. Use soft water to dilute the release agent

13). bubble

Reason: The gas is trapped under the surface of the casting
way of improvement:

1. Reduce entrainment (same as stoma)
2. Cool down or prevent low mold temperature

14). Sticky mold

the reason:

1. Zinc deposits on the surface of the mold
2. Molten soup impacts the mold, causing damage to the mold surface

Improve methods:

1. Decrease mold temperature
2. Reduce the roughness of the scratch
3. Increase draft angle
4. Coating
5. Change the filling mode
6. Reduce gate speed