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Metal mold low-pressure casting mold cooling device and preparation method thereof

A low-pressure casting and mold cooling technology, applied in the field of casting, can solve problems such as water leakage, uneven cooling, loss, etc., and achieve the effects of improving yield and production efficiency, shortening casting production cycle, and reducing the possibility of defects

Inactive Publication Date: 2021-06-25
CHANGZHOU INST OF MECHATRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If the casting structure is irregular, the difference in wall thickness at local locations is too large, such as the spokes of the aluminum alloy wheel, where the spokes and the outer rim intersect (hot joints), which causes the distance between the cooling groove machined on the mold and the surface of the inner cavity of the mold. There are different degrees of difference in the distance, it is impossible to achieve conformal cooling, and it is difficult to achieve rapid sequential solidification of castings; in addition, due to the uneven local wall thickness of the casting, the cooling is uneven during the solidification process, and casting often occurs in the area where the wall thickness changes excessively. Defects, or even cracks due to excessive internal stress caused by uneven cooling, such as the root of the spokes, the junction of the spokes and the outer rim, etc., reduce the mechanical properties of the key stress-bearing parts of the wheel
Secondly, in production, the casting mold needs to be taken off the machine frequently for maintenance. This kind of cooling pipe needs to be disassembled and installed repeatedly, which not only affects the production efficiency, but also has the risk of missing or wrong installation, causing unnecessary losses
Finally, the copper pipes of the water-cooled plate or air-cooled plate need to be connected with the external cooling medium. Generally, welding is used, which has a short service life and often leaks water and air, which not only affects product quality and production efficiency, but also affects the 6S of the production line. Management is troublesome

Method used

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  • Metal mold low-pressure casting mold cooling device and preparation method thereof
  • Metal mold low-pressure casting mold cooling device and preparation method thereof
  • Metal mold low-pressure casting mold cooling device and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The mold of this embodiment is used to prepare a 22.5-inch wheel, and the material is A356.2 alloy. The material of the main body of the mold used in this embodiment is mold steel H13, the wheel core adopts the 3D printing metal cooling device provided by the present invention to strengthen the cooling of the wheel core, and the rest of the positions adopt traditional water cooling and air cooling devices. The metal material used for 3D printing is 18Ni300 mold steel powder.

[0031] The wheel described in Example 1 is trial-manufactured by conventional low-pressure casting method, and the specific usage method is as follows:

[0032] 1) Pre-treatment: A356.2 aluminum ingots are melted, refined and modified, degassed, and slag-treated. The composition of the molten aluminum meets the range in Table 1, and the density is ≥ 2.61g / cm 3 ; After the mold is sandblasted and sprayed with paint, it is heated to 350-380°C and then put on the machine.

[0033] Table 1 A356.2 ma...

Embodiment 2

[0052] The mold of this embodiment is used to prepare a 20-inch wheel, and the material is A356.2 alloy. The material of the main body of the mold used in this embodiment is mold steel H13, the wheel core adopts the 3D printing metal cooling device provided by the present invention to strengthen the cooling of the wheel core, and the rest of the positions adopt traditional water cooling and air cooling devices. The metal material used for 3D printing is 316L stainless steel powder.

[0053] The wheel described in Example 1 is trial-manufactured by conventional low-pressure casting method, and the specific usage method is as follows:

[0054] 1) Pre-treatment: A356.2 aluminum ingots are melted, refined and modified, degassed, and slag-treated. The composition of the molten aluminum meets the range in Table 1, and the density is ≥ 2.61g / cm 3 ; After the mold is sandblasted and sprayed with paint, it is heated to 350-380°C and then put on the machine.

[0055] 2) According to t...

Embodiment 3

[0072] The mold of this embodiment is used to prepare a 22.5-inch wheel, and the material is A356.2 alloy. The main material of the mold used in this example is mold steel H13, the spokes and the core parts adopt the 3D printing metal cooling device provided by the present invention to strengthen the cooling of the spokes and the core parts, and the rest of the positions adopt traditional water cooling and air cooling devices . The metal material used for 3D printing is 18Ni300 mold steel powder.

[0073] The wheel described in embodiment 3 is trial-manufactured by the conventional low-pressure casting method, and the specific usage method is as follows:

[0074] 3) Pre-treatment: A356.2 aluminum ingots are melted, refined and modified, degassed, and slag-removed. The composition of the molten aluminum meets the range in Table 1, and the density is ≥ 2.61g / cm 3 ; After the mold is sandblasted and sprayed with paint, it is heated to 350-380°C and then put on the machine.

[...

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Abstract

The invention belongs to the technical field of metal mold low-pressure casting, and provides a mold cooling device and a preparation method. The equal distance between a cooling channel and the surface of an inner cavity of a mold is achieved by arranging a conformal cooling insert formed through metal 3D printing, the cooling uniformity of a casting can be effectively improved, and rapid sequential solidification of the casting in the casting mold is achieved. Compared with the prior art, the cooling effect is good, the temperature gradient of the mold and the casting is improved, the casting production takt can be shortened, the possibility that the casting has defects due to non-uniform local cooling is reduced, and the mechanical property of key parts of the casting is improved; and repeated dismounting and mounting are not needed when the mold is taken down for maintenance, and the risk of water leakage or air leakage is avoided, so that the yield and the production efficiency of cast products are effectively improved, and production line 6S management is facilitated. By means of the advantage of conformal cooling achieved through the technology, the mold cooling device and the preparation method have wide application prospects in the field of metal mold casting.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a cooling device for a metal mold low-pressure casting mold and a preparation method thereof. Background technique [0002] Metal low-pressure casting molds are usually composed of top molds, bottom molds, side molds and mold bases. In order to achieve rapid and sequential solidification of castings, the usual method is to set water cooling or Air cooling, through point cooling, line cooling, surface cooling, etc. to adjust the temperature field of the mold to eliminate casting defects. For example, the Chinese invention patent "automotive hub low-pressure casting vacuum water-cooling mold system" with application number CN201210089113.4 discloses a water-cooling device for low-pressure casting molds of aluminum alloy wheels. One end of the side-mold core tube is connected to the input water pipe, and the outer sleeve is connected to the output water pipe. The other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/04B22D15/00B33Y80/00
CPCB22D18/04B22D15/005B33Y80/00
Inventor 沈天成张章陈叶娣王霆管乐
Owner CHANGZHOU INST OF MECHATRONIC TECH
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