CN107760937A

CN107760937A - A kind of method for improving aluminum alloy die casting mechanical performance

Info

Publication number: CN107760937A
Application number: CN201710887144.7A
Authority: CN
Inventors: 赵郁鎏; 康阳洋; 杨其锐; 安玉山
Original assignee: GUANGDONG HONGTU (NANTONG) DIE-CASTING Co Ltd
Current assignee: GUANGDONG HONGTU (NANTONG) DIE-CASTING Co Ltd
Priority date: 2017-09-27
Filing date: 2017-09-27
Publication date: 2018-03-06

Abstract

The invention discloses a kind of method for improving aluminum alloy die casting mechanical performance, this method includes：The aluminum alloy melt of melting is pushed down into mould in the high pressure more than 80MPa, and solidification forms aluminum alloy die casting in a mold, it is 680mm to control supercharging distance in press casting procedure, and boosted flow 70, the die casting filling time is 40~60ms；Wherein aluminium alloy solution includes the component of following parts by weight：Si 9%~9.5%, Fe 0.8%~0.9%, Cu 3.6%~4%, Mn 0%~0.5%, Mg 0.25%~0.3%, Cr 0%~0.15%, Ni 0%~0.5%, Zn 0%~0.1%, Ti 0.1%~0.2%, Pb 0%~0.1%, Sn 0%~0.15% and surplus Al.

Description

A kind of method for improving aluminum alloy die casting mechanical performance

Technical field

The present invention relates to a kind of method for improving aluminum alloy die casting mechanical performance, it belongs to aluminium alloy casting field.

Background technology

Aluminium alloy is the alloy that other elements composition is added based on aluminium, is material the most frequently used in Structural Engineering, tool There is small proportion, good thermal conduction, good conductivity, environmental protection, recyclable, be widely used in 3C, mechanical transport transport, family The every field such as residence, Aero-Space, chemical industry, rocket.Aluminium alloy can be divided into Behaviors of Deformed Aluminum Alloys and Cast aluminium alloy by processing method Golden two major classes.Aluminium alloy can according to chemical composition be divided into alusil alloy, aluminium copper, almag, alumin(i)um zinc alloy and aluminium rare earth and close Gold, die casting are that one kind pours into molten alloy liquid in balancing gate pit, with the die cavity of high-speed filling steel die, and are pressing aluminium alloy Solidified under power and form the casting method of casting.

In the pack alloy for the auto parts machinery enjoyed, generally use A380 aluminium alloys are also processed, but it is mechanical Performance is not high, limits the development of the high speed and high power of automobile.

The content of the invention

Goal of the invention：The invention aims to make up the deficiencies in the prior art, there is provided one kind improves aluminium alloy compression casting The method of part mechanical performance, technological parameter during by the adjustment that is matched to aluminum alloy chemical composition to stablize die casting, so as to real The lifting of existing mechanical performance.

Technical scheme：A kind of method for improving aluminum alloy die casting mechanical performance, this method include：By the aluminium alloy of melting Liquid is pushed down into mould in the high pressure more than 80MPa, and solidification forms aluminum alloy die casting in a mold, controls and increases in press casting procedure Pressure distance is 840mm, and boosted flow 70, the die casting filling time is 40~60ms；Wherein aluminium alloy solution includes following weight The component of part：

Si 9%~9.5%, Fe 0.8%~0.9%, Cu 3.6%~4%, Mn 0%~0.5%, Mg 0.25%~0.3%, Cr 0%~ 0.15%th, Ni 0%~0.5%, Zn 0%~0.1%, Ti 0.1%~0.2%, Pb 0%~0.1%, Sn 0%~0.15% and surplus Al。

Die casting speed is directly proportional to forcer position during aluminum alloy melt die casting, forcer position 50 ~ 865, die casting speed be 0.1 ~ 1m/s。

When prepared by aluminium alloy solution, it is ensured that clear refining agitator is less than or equal to 100mm away from refining bag bottom, and control stirring turns Speed, when humidity is less than 85%, rotating speed 500-540rpm/min；When humidity is more than or equal to 85%, rotating speed 540-570rpm/min, Control is passed through nitrogen time >=8min simultaneously, and to ensure that passage runs through.

The mechanical performance of the aluminum alloy die casting includes tensile strength, yield strength and elongation percentage, wherein tensile strength- 3 σ >=155Mpa, the σ >=130Mpa of yield strength -3, elongation percentage >=1.5%.

Beneficial effect：A kind of method of disclosed raising aluminum alloy die casting mechanical performance, simultaneously because The not same-action that each alloying element rises in A380 aluminum alloy melts formula, the increase of Si contents can improve the castability of alloy Can, the increase of Cu contents can improve the mobility of alloy, tensile strength and hardness, but reduce corrosion resistance and plasticity, and hot tearing is inclined To increase, the increase of Mg contents can improve intensity and yield limit, improve machinability, the increase energy of Ti contents of alloy The grain structure of notable refining aluminum alloy, improves the mechanical performance of alloy, drops low-alloyed hot cracking tendency.So as to overregulate difference The content of element enables to aluminum alloy melt to provide stable flowing velocity and high speed position in press casting procedure, so that it is guaranteed that pressure The consistency of type casting moulding, thus elevating mechanism performance, wherein tensile strength Mean-3 σ >=155Mpa, yield strength Mean-3 σ >= 130Mpa, elongation percentage >=1.5%.

Brief description of the drawings

Fig. 1 is coupon dimensional drawing.

Embodiment

With reference to specific embodiment, the invention will be further described：

A kind of method for improving aluminum alloy die casting mechanical performance, this method comprise the following steps：

Aluminium alloy smelting：

According to alloying element proportioning Si 9%~9.5%, Fe 0.8%~0.9%, Cu 3.6%~4%, Mn 0%~0.5%, Mg 0.25%~0.3%, Cr 0%~0.15%, Ni 0%~0.5%, Zn 0%~0.1%, Ti 0.1%~0.2%, Pb 0%~0.1%, Sn 0%~0.15% and surplus Al, raw material is put into agitator and is stirred；

Nitrogen is passed through in whipping process, controls logical nitrogen time >=8min, and ensures that passage runs through in logical nitrogen procedure, together When whipping process in ensure to refine clearly agitator and wrap bottom≤100mm away from refining；When humidity is less than 85%, rotating speed 500- is controlled 540rpm/min；When humidity is more than or equal to 85%, rotating speed 540-570rpm/min is controlled；

Aluminium liquid density >=2.65g/cm3 of preparation, transhipment bag temperature of aluminum liquid >=690 DEG C.

Die casting：

The aluminum alloy melt of melting is pushed down into mould in the high pressure more than 80MPa, and solidification forms aluminium alloy compression casting in a mold Part, it is 150 ~ 180 DEG C to control mold temperature, and insulation in-furnace temperature is 675 ± 5 DEG C, and supercharging distance is 840mm in press casting procedure, Boosted flow is 70, and the die casting filling time is 40~60ms；And in press casting procedure die casting speed and forcer position relation referring to table 1：

Coupon samples：

According to coupon drawing（As shown in Figure 1）It is required that be sampled, it is specially using bull nose tool that circular arc portion is once-forming, prevent Only occurring connecing tool marks, guage section should be worked into 6.43 in processing, reuse 600 mesh sand paper and be ground to 6.40,

Sample the frequency：Being required according to GMW16704 grades 2, trial-production every time is sampled, each position at least 16,

Exemplar detects：Product is clamped according to experimental method and carries out experiment detection using stretching-machine.

Data record and output：All experimental datas obtained by collecting, and data are collected；Then use Minitable softwares, the experimental data collected is inputted, using just too distribution map draws Mean values and σ values, last formula meter Mean-3 σ value is calculated, and carries out result comparison.

Finally give tensile strength Mean-3 σ >=155Mpa, yield strength the Mean-3 σ of the aluminum alloy die casting >= 130Mpa, elongation percentage >=1.5%.

The technology contents and technical characteristic of the present invention have revealed that as above, but those skilled in the art still may base Make a variety of replacements and modification without departing substantially from spirit of the present invention in the announcement of the present invention, therefore, the scope of the present invention should be unlimited In the content disclosed in embodiment, and various replacements and modification without departing substantially from the present invention should be included, and be present patent application right It is required that covered.

Claims

A kind of 1. method for improving aluminum alloy die casting mechanical performance, it is characterised in that this method includes：By the aluminium alloy of melting Liquid is pushed down into mould in the high pressure more than 80MPa, and solidification forms aluminum alloy die casting in a mold, controls and increases in press casting procedure Pressure distance is 680mm, and boosted flow 70, the die casting filling time is 40~60ms；Wherein aluminium alloy solution includes following weight The component of part：

Si 9%~9.5%, Fe 0.8%~0.9%, Cu 3.6%~4%, Mn 0%~0.5%, Mg 0.25%~0.3%, Cr 0%~ 0.15%th, Ni 0%~0.5%, Zn 0%~0.1%, Ti 0.1%~0.2%, Pb 0%~0.1%, Sn 0%~0.15% and surplus Al。
A kind of 2. method for improving aluminum alloy die casting mechanical performance according to claim 1, it is characterised in that：Aluminium alloy Die casting speed is directly proportional to forcer position when hydraulic pressure is cast, and forcer position 50 ~ 865, die casting speed is 0.1 ~ 1m/s.
A kind of 3. method for improving aluminum alloy die casting mechanical performance according to claim 1, it is characterised in that：Aluminium alloy When prepared by solution, it is ensured that clear refining agitator is less than or equal to 100mm away from refining bag bottom, controls speed of agitator, when humidity is less than 85% When, rotating speed 500-540rpm/min；When humidity is more than or equal to 85%, rotating speed 540-570rpm/min, while control is passed through nitrogen Time >=8min, and to ensure that passage runs through.
A kind of 4. method for improving aluminum alloy die casting mechanical performance according to claim 1, it is characterised in that：The aluminium closes The mechanical performance of golden die casting includes tensile strength, yield strength and elongation percentage, and wherein tensile strength Mean-3 σ >= 155Mpa, yield strength Mean-3 σ >=130Mpa, elongation percentage >=1.5%.