Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of sequential pressurization method after crystallization and holding pressure for metal mold low-pressure casting of aluminum alloy automobile chassis casting

A technology of automobile chassis and low pressure casting, which is applied in the field of sequential pressurization after crystallization pressure maintaining for metal mold low pressure casting of aluminum alloy automobile chassis castings, can solve problems such as difficulty in achieving high crystallization supercharging pressure, and achieve high adaptability to low cost and high pressure. Mass production requirements, improve tensile strength, avoid the effect of inconvenient operation

Active Publication Date: 2017-05-10
北京航大新材科技有限公司
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that it is difficult to achieve high crystallization boost pressure in low-pressure casting of aluminum alloy automobile chassis castings with complex shapes and variable cross-sections. After entering the stage of crystallization and holding pressure, the pressurization method is used for the low-pressure casting of aluminum alloy castings, which is continuously pressurized according to the solidification sequence, so as to further reduce casting defects such as shrinkage cavities and porosity, and improve the microstructure and mechanical properties of castings.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of sequential pressurization method after crystallization and holding pressure for metal mold low-pressure casting of aluminum alloy automobile chassis casting
  • A kind of sequential pressurization method after crystallization and holding pressure for metal mold low-pressure casting of aluminum alloy automobile chassis casting
  • A kind of sequential pressurization method after crystallization and holding pressure for metal mold low-pressure casting of aluminum alloy automobile chassis casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The rear steering knuckle 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.

[0066] see Figure 1B As shown in the pressure-time curve diagram, the steps of preparing aluminum alloy rear steering knuckle castings by adopting metal mold low-pressure casting molding with crystallization and pressure-holding followed by sequential pressurization method are as follows:

[0067] Step 1, liquid ascending stage;

[0068] Under the conditions of the liquid lifting pressure of 18kPa and the liquid lifting speed of 1.8kPa / s, the alumi...

Embodiment 2

[0091] The lower control arm, A356 alloy, 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.

[0092] see Figure 2B As shown in the pressure-time curve diagram, the steps of preparing aluminum alloy lower control arm castings by adopting metal mold low-pressure casting molding with crystallization and pressure-holding followed by sequential pressurization method are as follows:

[0093] Step 1, liquid ascending stage;

[0094] 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...

Embodiment 3

[0115] The rear steering knuckle 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.

[0116] see image 3 As shown in the pressure-time curve diagram, the steps of preparing aluminum alloy rear steering knuckle castings by adopting metal mold low-pressure casting molding with crystallization and pressure-holding followed by sequential pressurization method are as follows:

[0117] Step 1, liquid ascending stage;

[0118] Under the conditions of liquid lifting pressure of 16kPa and 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;

[0119] Step 2, the filling stage;

[0120] Under the condition that the filling pressure i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
elongationaaaaaaaaaa
elongationaaaaaaaaaa
elongationaaaaaaaaaa
Login to View More

Abstract

The invention discloses a sequential pressure boost method after crystallization pressure maintaining and for metal-mould low-pressure casting forming of aluminum alloy automobile chassis cast parts. According to the method, an existing aluminum alloy cast part low-pressure casting process is still adopted at the stages of liquid lift, mold filling and crystallization pressure boost, and the liquid lift pressure, mold filling pressure and crystallization pressure boost pressure are controlled to be 15-21kPa, 25-35kPa and 80-100kPa correspondingly. A sequential pressure boost stage is added between the crystallization pressure maintaining stage and the pressure relief stage. According to structural characteristics of the cast parts and the solidification sequence, multiple characteristic positions are set. After the situation that the characteristic position A starts to be solidified is determined, the crystallization pressure maintaining pressure starts to be increased; after the situation that the characteristic position B starts to be solidified is determined, the pressure boost speed is increased; and after the characteristic position C starts to be solidified, the pressure boost speed continues to be increased to reach 20-40kPa / s till the crystallization pressure maintaining pressure is increased to 310-1000kPa, and then pressure maintaining is carried out till solidification of the characteristic position D is finished. By means of the sequential pressure boost method after crystallization pressure maintaining and for metal-mould low-pressure casting forming of the aluminum alloy automobile chassis cast parts, the solidification feeding effect and the mechanical property of the cast parts are remarkably improved, meanwhile the defects of molten aluminum splashing, casting fin and burrs and the like are avoided, and the requirement for a mold structure and casting-molding mold clamping force is remarkably lowered.

Description

technical field [0001] The present invention relates to a method of manufacturing aluminum alloy automobile chassis castings by adopting a low-pressure casting process, more particularly, it is a method for preparing aluminum alloy automobile chassis castings by sequentially increasing the pressure after entering the crystallization and pressure-holding stage according to the sequential solidification time 1. Sequential pressurization method after crystallization and pressure holding for 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 199...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com