CN104741574A - Low-pressure casting process of aluminum alloy steering joint - Google Patents

Abstract

The invention discloses a low-pressure casting process of an aluminum alloy steering joint. The process comprises the following steps: (A) a material is selected and prepared (A356 alloy is adopted; Sr with the mass percentage of 0.04-0.05% by the total quantity of alloy liquid is added to deteriorate molten aluminum so as to refine grains in the crystallization of the molten aluminum); (B) a product is cast by a low-pressure casting mold through the steps of descending of a filter screen, mold closing, liquid rising, mold filling, pressure keeping, opening of water cooling, pressure unloading, closing of water cooling, opening of an upper mold, ejection and part taking. The process mainly solves such problems as high equipment tonnage, complex procedures in manufacturing process and high material cost of a conventional aluminum alloy steering joint casting method, can produce casting products accordant with the requirements without needing expensive investment, is high in structure compactness of castings, is high in casting quality, and is high in production efficiency. Meanwhile, the molten metal is high in utilization rate; and the consumption of auxiliary materials is less.

Description

The low-pressure casting process of aluminium alloy knuckle

 

Technical field

The invention belongs to casting technology field, be specifically related to a kind of low-pressure casting process of aluminium alloy knuckle.

 

Background technology

The low-pressure casting process of aluminium alloy knuckle at least comprises lower screen pack, matched moulds, rises liquid, fills type, pressurize, open the process such as water-cooled, release, in current aluminium alloy knuckle pouring technology, the casting finished products density made is inadequate, need processing further, not only casting process is more, affect production capacity, the precision of product cannot effectively be ensured simultaneously, and percent defective is higher.

 

Summary of the invention

In order to overcome the above-mentioned technical problem that prior art field exists, the object of the invention is to, provide a kind of low-pressure casting process of aluminium alloy knuckle, directly can cast out aluminium alloy knuckle foundry goods, auxiliary material consumption is few, and processing technology thereof is simple.

The low-pressure casting process of aluminium alloy knuckle provided by the invention, comprises the following steps:

(1) the selecting and prepare of material: aluminum alloy materials adopts A356, A356 alloy pig is put into melting furnace melt, after fusing alloy liquid carry out going bad, refining treatment, refining temperature is 730 ~ 740 DEG C, and by aluminium alloy total amount add mass percent be 0.04 ~ 0.05% Sr aluminium liquid is gone bad, make the grain refinement during crystallization of aluminium liquid; Adopt rotary degassing machine to pass into argon gas 10 ~ 15min simultaneously and carry out the degasification of aluminium liquid, after degasification completes, aluminium liquid is left standstill 10 ~ 15min; Reduce the air content in aluminium liquid, stand-by in the holding furnace finally aluminium alloy handled well being injected into air injection machine;

(2) product casting: adopt low pressure casting die to cast; Comprise: lower screen pack, matched moulds, rise liquid, fill type, pressurize, open water-cooled, release, pass water-cooled, open patrix, eject, pickup step; First muff and mould are carried out preheating before cast, controlling mold preheating temperature is 340 ± 20 DEG C; The temperature of aluminum liquid in holding furnace is made to be 705 ± 10 DEG C; Pour into a mould after matched moulds; Fill type technological parameter to be respectively: rise hydraulic coupling 0.0155MPa, rise the liquid time be 12 seconds, mold filling pressure is 0.022MPa, filling time is 10 seconds, dwell pressure is 0.05 ~ 0.06MPa, the dwell time is 130 ± 20 seconds, cool time is 50 ± 20 seconds, carry out die sinking, after foundry goods is with height patrix moving on to setting, eject foundry goods.

The low-pressure casting process of aluminium alloy knuckle provided by the invention, its beneficial effect is, overcomes prior art process operation more, the problem that workload is large, improves production efficiency; Solve the problems such as existing aluminium alloy steering knuckle forging method exists equipment tonnage greatly, complex procedures in manufacture process, and material cost is high, it does not need expensive investment can produce satisfactory cast product, and dense structure's degree of foundry goods is high, casting quality is good, and production efficiency is high.

 

Detailed description of the invention

Below in conjunction with an embodiment, the low-pressure casting process of aluminium alloy knuckle provided by the invention is described in detail.

Embodiment

The low-pressure casting process of the aluminium alloy knuckle of the present embodiment, comprises the following steps:

(1) the selecting and prepare of material: aluminum alloy materials adopts A356, A356 alloy pig is put into melting furnace melt, after fusing alloy liquid carry out going bad, refining treatment, refining temperature is 735 DEG C, and by aluminium alloy total amount add mass percent be 0.045% Sr aluminium liquid is gone bad, make the grain refinement during crystallization of aluminium liquid; Adopt rotary degassing machine to pass into argon gas 13min simultaneously and carry out the degasification of aluminium liquid, after degasification completes, aluminium liquid is left standstill 12min; Reduce the air content in aluminium liquid, stand-by in the holding furnace finally aluminium alloy handled well being injected into air injection machine;

(2) product casting: adopt low pressure casting die to cast; Comprise: lower screen pack, matched moulds, rise liquid, fill type, pressurize, open water-cooled, release, pass water-cooled, open patrix, eject, pickup step; First muff and mould are carried out preheating before cast, controlling mold preheating temperature is 350 DEG C; The temperature of aluminum liquid in holding furnace is made to be 705 DEG C; Pour into a mould after matched moulds; Fill type technological parameter to be respectively: rise hydraulic coupling 0.0155MPa, rise the liquid time be 12 seconds, mold filling pressure is 0.022MPa, filling time is 10 seconds, dwell pressure is 0.055MPa, the dwell time is 1306 seconds, cool time is 59 seconds, carry out die sinking, after foundry goods is with height patrix moving on to setting, eject foundry goods.

The low-pressure casting process of aluminium alloy knuckle, directly can cast out aluminium alloy knuckle foundry goods, and without the need to machining, operation is simple, and the finished size cast out is accurate, effectively ensure that casting quality.

Claims (1)

1. a low-pressure casting process for aluminium alloy knuckle, is characterized in that: said method comprising the steps of:

(1) the selecting and prepare of material: aluminum alloy materials adopts A356, A356 alloy pig is put into melting furnace melt, after fusing alloy liquid carry out going bad, refining treatment, refining temperature is 730 ~ 740 DEG C, and by aluminium alloy total amount add mass percent be 0.04 ~ 0.05% Sr aluminium liquid is gone bad, make the grain refinement during crystallization of aluminium liquid; Adopt rotary degassing machine to pass into argon gas 10 ~ 15min simultaneously and carry out the degasification of aluminium liquid, after degasification completes, aluminium liquid is left standstill 10 ~ 15min; Reduce the air content in aluminium liquid, stand-by in the holding furnace finally aluminium alloy handled well being injected into air injection machine;

(2) product casting: adopt low pressure casting die to cast; Comprise: lower screen pack, matched moulds, rise liquid, fill type, pressurize, open water-cooled, release, pass water-cooled, open patrix, eject, pickup step; First muff and mould are carried out preheating before cast, controlling mold preheating temperature is 340 ± 20 DEG C; The temperature of aluminum liquid in holding furnace is made to be 705 ± 10 DEG C; Pour into a mould after matched moulds; Fill type technological parameter to be respectively: rise hydraulic coupling 0.0155MPa, rise the liquid time be 12 seconds, mold filling pressure is 0.022MPa, filling time is 10 seconds, dwell pressure is 0.05 ~ 0.06MPa, the dwell time is 130 ± 20 seconds, cool time is 50 ± 20 seconds, carry out die sinking, after foundry goods is with height patrix moving on to setting, eject foundry goods.