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A crystallization pressurization method for low-pressure casting molding of aluminum alloy automobile chassis casting metal mold

A technology of automobile chassis and low-pressure casting, which is applied in the field of crystal boosting for metal mold low-pressure casting, to achieve the effects of improving tensile strength, improving solidification feeding effect, and reducing mold clamping force

Active Publication Date: 2017-05-31
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 of realizing high crystallization supercharging pressure in low-pressure casting of aluminum alloy automotive chassis castings with complex shapes such as steering knuckles, control arms, and sub-frames, and variable cross-sections, combined with the structural characteristics of such castings and the sequential solidification process requirements , according to the solidification end time of the characteristic part A, a pressurization method for metal mold low-pressure casting molding is proposed by dividing the crystallization boost into two stages to increase the crystallization boost pressure, so as to further reduce casting defects such as shrinkage cavity and porosity , Improve the structure density and mechanical properties of castings

Method used

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  • A crystallization pressurization method for low-pressure casting molding of aluminum alloy automobile chassis casting metal mold
  • A crystallization pressurization method for low-pressure casting molding of aluminum alloy automobile chassis casting metal mold
  • A crystallization pressurization method for low-pressure casting molding of aluminum alloy automobile chassis casting metal mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The rear steering knuckle of the car is made of A356 alloy and weighs 2.8kg. The pouring temperature is 710°C, the mold material is H13 steel, the initial mold temperature is 350°C, and the cooling method is a combination of 9-way water cooling and 3-way air cooling. Steering knuckle configuration and characteristic parts such as Figure 1A shown. Figure 1A The structure refers to "Lightweight Design and Test Verification of Automobile Rear Steering Knuckle" of Hyundai Manufacturing Engineering, No. 4, 2014, author Zhang Qi et al.

[0063] see Figure 1B The pressure-time curve diagram of the crystallization pressurization method shown, the steps for preparing aluminum alloy automobile chassis castings by the crystallization pressurization method for metal mold low-pressure casting molding are as follows:

[0064] Step 1, liquid ascending stage;

[0065] Under the conditions of the lifting pressure of 19kPa and the lifting speed of 1.9kPa / s, the aluminum liquid rises...

Embodiment 2

[0087] The lower control arm of the car is made of A356 alloy and weighs 2.4kg. The pouring temperature is 720°C, the mold material is H13 steel, the initial mold temperature is 250°C, and the cooling method is a combination of 6-way water cooling and 3-way air cooling. Control arm configuration and characteristic parts such as Figure 2A shown. Figure 2A The structure refers to "Numerical Simulation and Process Optimization of Automobile Control Arm Squeeze Casting", author Xing Zhiwei, etc.

[0088] see Figure 2B The pressure-time curve diagram of the crystallization pressurization method shown, the steps for preparing aluminum alloy automobile chassis castings by the crystallization pressurization method for metal mold low-pressure casting molding are as follows:

[0089] Step 1, liquid ascending stage;

[0090] 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 ris...

Embodiment 3

[0112] The rear steering knuckle of the car is made of A356 alloy and weighs 2.8kg. The pouring temperature is 710°C, the mold material is H13 steel, the initial mold temperature is 350°C, and the cooling method is a combination of 9-way water cooling and 3-way air cooling. Steering knuckle configuration and characteristic parts such as Figure 1A shown.

[0113] see image 3 The pressure-time curve diagram of the crystallization pressurization method shown, the steps for preparing aluminum alloy automobile chassis castings by the crystallization pressurization method for metal mold low-pressure casting molding are as follows:

[0114] Step 1, liquid ascending stage;

[0115] 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;

[0116] Step 2, the filling stage;

[0117] Under the conditions of filling pressure...

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Abstract

The invention discloses a crystallization pressurization method for metal mold low-pressure casting molding of an aluminum alloy vehicle chassis casting. The method continues a traditional low-pressure casting process of the aluminum alloy vehicle chassis casting in the phases of liquid rise, mold filling and crystallization pressurization; and the liquid rise pressure and the mold filling pressure are controlled within 18-21 kPa and 30-35 kPa. The crystallization pressurization is divided into two stages according to the condensation ending time of a characteristic part A: in the first stage: in the stage from the end of the mold filling phase to the condensation end of the characteristic part A, the crystallization pressurization pressure is increased to 80-150 kPa; and in the second stage: after the condensation of the characteristic part A is finished, the crystallization pressurization pressure is quickly increased to 160-1000 kPa, and the pressurization speed is 10-40 kPa / s. Then, the pressure keeping stage and the pressure relief are performed. 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 of manufacturing aluminum alloy automobile chassis castings by using a low-pressure casting process, more particularly, it is a method of dividing the crystallization supercharging into two stages according to the solidification end time of the characteristic part A to increase the crystallization supercharging pressure A crystallization pressurization method for preparing aluminum alloy automobile chassis castings and metal mold low-pressure casting. Background technique [0002] In recent years, with the improvement of automobile lightweight requirements, the application of aluminum alloy structural parts in automobiles has become more and more extensive. Taking the chassis suspension system as an example, the application ratio of aluminum alloy front / rear steering knuckles is close to 50%, and the application ratio of aluminum alloy in swing arms and control arm parts has also reached about 30%. In 1995, th...

Claims

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Application Information

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Patent Type & Authority Patents(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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