Liejimo liejimo formos
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Liejimo liejimo formos

Liejimo liejimo forma yra metalo dalių liejimo įrankis. Tai įrankis liejimo procesui užbaigti specialia liejimo kalimo mašina. Pagrindinis liejimo procesas yra toks: pirmasis metalinis skystis užpildo pelėsių ertmę mažu arba dideliu greičiu

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Prekės aprašymas

Die casting mould is a kind of tool for casting metal parts. It is a tool for completing the die casting process on a special die forging machine. The basic process of die casting is as follows: the metal liquid first fills the mold cavity with low speed or high speed casting, and the mold has the active cavity surface, which is forged under pressure with the cooling process of the metal liquid, which not only eliminates the shrinkage cavity and porosity defects of the blank, but also makes the inner structure of the blank reach the broken grain of forging state. The comprehensive mechanical properties of the blank have been improved remarkably.

Die casting mould

1. Die casting mold has high heat fatigue, thermal conductivity, abrasion resistance, corrosion resistance, impact toughness, red hardness, good demoulding, etc
2. Three new technologies for surface treatment of die casting molds:
(1) Improvement technology of traditional heat treatment process;
(2) Surface modification technology, including surface thermal diffusion treatment, surface phase change strengthening, electric spark strengthening technology, etc.
(3) Coating technology, including electroless plating, etc.

The control of die surface temperature is very important for the production of high quality die castings. Uneven or inappropriate die casting die temperature will also lead to casting dimension instability, casting deformation during the production process, resulting in thermal pressure, viscous die, surface depression, internal shrinkage cavity and hot bubble and other defects. When the mold temperature difference is large, the variables in the production cycle, such as filling time, cooling time and spraying time, have different degrees of influence.
1). Cold lines:
Reason: The temperature of the front end of melt soup is too low, there are traces of overlap
Improvement methods:
1. Check whether the wall thickness is too thin (design or manufacture), the thinner areas should be directly filled
2. Check whether the shape is not easy to fill; Too far away, closed areas (such as fin (fin), bulges), blocked areas, small rounded corners, etc. are not easy to fill. And notice if there are ribs or cold spots
3. A method of shortening the filling time
4. Change the filling mode
5. Methods of increasing mold temperature
6. Raise the melting temperature of the soup
7. Check alloy composition
8. Increasing the escape route might help
9. Vacuuming devices may be useful
2). Crack:
The reason:
1. Shrinkage stress
2. Force on ejector or flange to crack
Ways to Improve:
1. More rounded corners
2. Check for hot spots
3. Pressurization time change (cold chamber machine)
4. Increase or decrease the clamping time
5. Increase the drawing Angle
6. Add ejector pin
7. Check the mold for misalignment and deformation
8. Check alloy composition
3). Porosity:
The reason:
1. Air mingled with the molten soup
2. Source of gas: melting, in the pipe, in the mold, release agent
Improvement methods:
1. Moderate slow speed
2. Check whether the runner turns smoothly and the cross-sectional area decreases
3. Check that the area of the escape port is large enough, that it is blocked, and that it is in the final filling
4. Check if the release agent is sprayed too much and the mold temperature is too low
5. Use the vacuum
4). Cavitation erosion:
Cause: Due to the sudden reduction of pressure, the gas in the molten soup suddenly expanded, impacting the mold, causing mold damage
Improvement methods:
The cross-sectional area of flow passage should not change sharply
5). Shrinkage cavity:
Reason: When a metal solidifies from liquid to solid, it takes up less space. If there is no metal supplement, shrinkage cavity will be formed, which usually occurs at a relatively slow solidification place
Improvement methods:
1. Increase the pressure
2. Change the mold temperature. Local cooling, spray release agent, reduce mold temperature,. Sometimes you just change the location of the shrinkage cavity, not the shrinkage cavity
6). Peeling:
The reason:
1. Poor filling mode results in overlap of molten soup
2. Mold deformation caused melting soup overlap
3. Inclusion oxide
Improvement methods:
1. Switch to high speed early
2. Shortening filling time
3. Change the filling mode, gate position and 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
7). Bellows:
Reason: The first layer of molten soup cooled sharply on the surface, while the second layer failed to melt the first layer, but there was enough fusion, resulting in different tissues
Improvement methods:
1. Improved filling mode
2. Shortening filling time
8). Holes caused by poor flow:
Reason: Molten soup flows too slowly, or too cold, or poor filling mode, so there are holes in the solidified metal joints
Improvement methods:
1. The same as the improvement of cold lines
2. Check whether the melting temperature is stable
3. Check whether the mold temperature filling is stable
9). Holes on the parting surface:
Cause: It may be a shrinkage cavity or blowhole
Improvement methods:
1. In case of shrinkage, reduce gate thickness or overflow well inlet thickness
2. Cooling gate
3. If there are air holes, pay attention to exhaust or air entrainment
10). Flash:
The reason:
1. Insufficient clamping force
2. The mould does not close properly
3. Lack of mold strength
4. The melting soup is too hot
11). Shrinkage in:
Cause: Shrinkage occurs below the surface of the piece
Improvement methods:
1. Same as the method to improve the shrinkage cavity
2. Local cooling
3. Heat the other side
12). Carbon deposition:
Cause: Release agent or other impurities accumulate on the mold.
Improvement methods:
1. Reduce release spray volume
2. Higher mold temperatures
3. Select the appropriate release agent
4. Use soft water to dilute release agent
13). Bubble:
Cause: Gas is trapped under the surface of the casting
Ways to Improve:
1. Reduce air entrapment (coporosity)
2. Cool or prevent low mold temperature
14). Sticky mode:
The reason:
1. Zinc accumulates on the surface of the die
2. The molten soup impinges on the mold, causing damage to the mold surface
Improvement methods:
1. Reduce mold temperature
2. Reduce surface roughness
3. Increase the drawing Angle
4. coating
5. Change the filling mode
6. Reduce gate speed
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