Crystallization pressure keeping and increasing method for low-pressure casting molding of aluminum alloy wheel metal mold

A low-pressure casting and metal mold technology, which is applied in the field of crystallization pressure holding and boosting for metal mold low-pressure casting, can solve the problem of difficult to achieve high crystallization boost pressure, improve the solidification feeding effect, and reduce shrinkage porosity and porosity. , to avoid the effect of overflow

Active Publication Date: 2016-06-22
北京航大新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 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 , a method of crystallization pressure boosting for the preparation of aluminum alloy wheels and low-pressure casting of metal molds, which is continuously pressurized according to the solidification sequence during the crystallization and pressure holding stage, is proposed to further reduce casting defects such as shrinkage cavities and porosity, and improve aluminum alloy wheels. Microstructure Density and Mechanical Properties of Alloy Wheels

Method used

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  • Crystallization pressure keeping and increasing method for low-pressure casting molding of aluminum alloy wheel metal mold
  • Crystallization pressure keeping and increasing method for low-pressure casting molding of aluminum alloy wheel metal mold
  • Crystallization pressure keeping and increasing method for low-pressure casting molding of aluminum alloy wheel metal mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] 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.

[0093] The steps of preparing aluminum alloy wheels by adopting metal mold low-pressure casting molding with crystallization pressure-holding and boosting method include:

[0094] Step 1, liquid ascending stage;

[0095] Under the condition that the liquid lifting pressure is 20kPa and the liquid lifting speed is 2.0kPa / s, the aluminum liquid rises steadily along the liquid rising pipe to the gate of the mold and flows into the mold;

[0096] Step 2, the filling stage;

[0097] Under the conditions of the filling pressure of 30kPa and the filling speed of 0.75kPa / s, the molten aluminum is filled into the cavity from the gate until the cavity is completely filled;

[0098] Step 3, crystallization pressurization stage;

[0099] Af...

Embodiment 2

[0118] 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.

[0119] The steps of preparing aluminum alloy wheels by adopting metal mold low-pressure casting molding with crystallization pressure-holding and boosting method include:

[0120] Step 1, liquid ascending stage;

[0121] 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;

[0122] Step 2, the filling stage;

[0123] 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;

[0124] Step 3, crystallization pressurization stag...

Embodiment 3

[0143] 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.

[0144] The steps of preparing aluminum alloy wheels by adopting metal mold low-pressure casting molding with crystallization pressure-holding and boosting method include:

[0145] Step 1, liquid ascending stage;

[0146] 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;

[0147] Step 2, the filling stage;

[0148] Under the condition that the filling pressure is 30kPa and the filling speed is 1.0kPa / s, the molten aluminum is filled into the cavity from the gate until the cavity is completely filled;

[0149] Step 3, crystallization pressurization stage;

[015...

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Abstract

The invention discloses a crystallization pressure keeping and increasing method for low-pressure casting molding of an aluminum alloy wheel metal mold; the method continues a traditional aluminum alloy wheel low-pressure casting process in the liquid rising, mold filling and crystallization pressurization phase; and the liquid rising pressure, the mold filling pressure and the crystallization pressurization pressure are controlled at 18-21 kPa, 30-35 kPa and 80-100 kPa. A traditional crystallization pressurization phase is changed to a crystallization pressure keeping and increasing phase. After the crystallization pressurization phase, the crystallization pressure keeping pressure is continuously increased to 100-200 kPa; then, the crystallization pressure keeping pressure is adjusted according to the solidification time of inner and outer flanges, a rim, a spoke and rim transition part and a wheel center in sequence; and the maximum crystallization pressure keeping pressure can be increased to 310-1000 kPa. The method prominently improves the solidification feeding effect and the casting mechanical performance, prevents such defects as molten aluminum splashing and casting flange 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 of manufacturing aluminum alloy wheels by using low-pressure casting technology, more particularly, it is a kind of low-pressure casting molding of metal molds for preparing aluminum alloy wheels by continuing pressurization in the stage of crystallization and holding pressure according to the solidification time in sequence Use the crystallization pressurization method. 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 parts produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/04
CPCB22D18/04B22D27/13
Inventor 张花蕊张虎
Owner 北京航大新材科技有限公司
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