Sequential pressurization method after crystallization pressure keeping for metal mold low-pressure casting molding of aluminum alloy wheel

A technology of low-pressure casting and sequential pressurization, which is applied in the field of sequential pressurization after crystallization pressure holding for low-pressure casting of aluminum alloy wheel metal molds. It can solve the problems that it is difficult to achieve high crystallization boost pressure, and improve the effect of solidification and feeding. , Avoid overflow, improve tissue density and mechanical properties

Active Publication Date: 2016-05-18
北京航大新材科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the existing aluminum alloy wheels are difficult to achieve high crystallization boost pressure by the metal mold low-pressure casting method, combined with the structural characteristics of the aluminum alloy wheels and the requirements of the sequential solidification process, under the premise of retaining the controllable filling speed of the existing low-pressure casting method , proposes a method of continuous pressurization according to the solidification sequence in the crystallization and pressure holding stage, the method of sequential pressure increase after crystallization and pressure holding for the preparation of aluminum alloy wheels, and metal mold low-pressure casting molding, in order to further reduce casting defects such as shrinkage cavities and porosity, Improving Microstructure Density and Mechanical Properties of Aluminum Alloy Wheels

Method used

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  • Sequential pressurization method after crystallization pressure keeping for metal mold low-pressure casting molding of aluminum alloy wheel
  • Sequential pressurization method after crystallization pressure keeping for metal mold low-pressure casting molding of aluminum alloy wheel
  • Sequential pressurization method after crystallization pressure keeping for metal mold low-pressure casting molding of aluminum alloy wheel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] 26-inch, A356 alloy wheels. H13 steel mold, upper mold + lower mold + 4 side mold structure, directly exposed to the atmosphere. The pouring temperature is 710°C, the initial mold temperature is 400°C, and the cooling method is air cooling.

[0087] see Figure 2A As shown in the pressure-time curve diagram, the steps of preparing aluminum alloy wheels by adopting metal mold low-pressure casting molding, using crystallization and pressure-holding followed by sequential pressurization method are as follows:

[0088] Step 1, liquid ascending stage;

[0089] Under the conditions of the lifting pressure of 19kPa and the lifting speed of 1.9kPa / s, the aluminum liquid rises steadily along the rising pipe to the gate of the mold and flows into the mold;

[0090] Step 2, the filling stage;

[0091] Under the condition that the filling pressure is 32kPa and the filling speed is 0.65kPa / s, the molten aluminum is filled into the cavity from the gate until the cavity is complet...

Embodiment 2

[0111] 18-inch, A356 alloy wheels. H13 steel mold, upper mold + lower mold + 4 side mold structure, directly exposed to the atmosphere. The pouring temperature is 720°C, the initial mold temperature is 400°C, and the cooling method is wind-mist mixing cooling.

[0112] The steps of preparing aluminum alloy wheels by adopting metal mold low-pressure casting molding with crystallization and pressure-holding followed by sequential pressurization method are as follows:

[0113] Step 1, liquid ascending stage;

[0114] Under the conditions of the liquid lifting pressure of 21kPa and the liquid lifting speed of 1.8kPa / s, the aluminum liquid rises steadily along the liquid rising pipe to the gate of the mold and flows into the mold;

[0115] Step 2, the filling stage;

[0116] Under the condition that the filling pressure is 35kPa and the filling speed is 0.54kPa / s, the molten aluminum is filled into the cavity from the gate until the cavity is completely filled;

[0117] Step 3,...

Embodiment 3

[0135] 20 inches, A356 alloy cast spin wheels. H13 steel mold, upper mold + lower mold + 4 side mold structure, directly exposed to the atmosphere. The pouring temperature is 700°C, the initial mold temperature is 350°C, and the cooling method is wind-mist mixing cooling.

[0136] The steps of preparing aluminum alloy wheels by adopting metal mold low-pressure casting molding with crystallization and pressure-holding followed by sequential pressurization method are as follows:

[0137] Step 1, liquid ascending stage;

[0138] Under the conditions of the liquid lifting pressure of 18kPa and the liquid lifting speed of 2.0kPa / s, the aluminum liquid rises steadily along the liquid rising pipe to the gate of the mold and flows into the mold;

[0139] Step 2, the filling stage;

[0140] Under the conditions of the filling pressure of 30kPa and the filling speed of 0.98kPa / s, the molten aluminum is filled into the cavity from the gate until the cavity is completely filled;

[01...

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Abstract

The invention discloses a sequential pressurization method after crystallization pressure keeping for metal mold low-pressure casting molding of an aluminum alloy wheel. The method continues a traditional low-pressure casting process of the aluminum alloy wheel in the phases of liquid rise, mold filling and crystallization pressurization; and the liquid rise pressure, the mold filling pressure and the crystallization pressurization pressure are controlled within 18-21 kPa, 30-35 kPa and 80-100 kPa. After the crystallization pressurization phase is performed, a sequential pressurization phase is added. After the completion of condensation of inner and outer rim parts is determined, the crystallization pressurization pressure is increased to 100-200 kPa; then, the crystallization pressure keeping pressure is sequentially adjusted according to the condensation time of rims, spoke and rims transition parts and wheel centers; and the minimum crystallization pressure keeping pressure can be increased to 310-1000 kPa. The method prominently improves the condensation feeding effect and the casting mechanical performance, prevents such defects as molten aluminum splashing and casting flanges and burrs, and prominently reduces the requirements on the mold structure and the casting mold clamping force.

Description

technical field [0001] The present invention relates to a method for manufacturing aluminum alloy wheels by using a low-pressure casting process, more particularly, it is a method for preparing aluminum alloy wheels by sequentially pressurizing the solidification time in the crystallization and pressure-holding stage, and metal mold low-pressure casting The type uses a method of sequential pressurization after crystallization and pressure holding. Background technique [0002] Compared with traditional gravity casting, the filling speed of low-pressure casting is controllable, the molten metal flows smoothly, and secondary inclusions are reduced. Compared with sand casting, metal casting has a faster cooling rate, and it is easier to obtain fine and dense structures and high mechanical properties, and it is also easier to realize automation and clean production. Therefore, metal low pressure casting is widely used in the production of aluminum alloy wheels and chassis. Auto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/04
CPCB22D18/04
Inventor 张花蕊张虎
Owner 北京航大新材科技有限公司
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