CN101829774B

CN101829774B - Casting method of aluminum alloy wheel rim

Info

Publication number: CN101829774B
Application number: CN2010101849313A
Authority: CN
Inventors: 尤飞君
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-25
Filing date: 2010-05-25
Publication date: 2011-09-28
Anticipated expiration: 2030-05-25
Also published as: CN101829774A

Abstract

The invention relates to a casting method of an aluminum alloy wheel rim. The method comprises the following steps: firstly manufacturing an aluminum alloy ring by using a simple gravity casting mold and an aluminum ingot which is the same with material for manufacturing the aluminum alloy wheel rim, respectively pre-heating the aluminum alloy ring and a metal casting mold, putting the pre-heated aluminum alloy ring on the step of the bottom mold of a low-pressure casting mold, then closing the mold, pressing alloy-containing molten aluminum into the cavity, melting the molten aluminum and the aluminum alloy ring into a whole, wherein the aluminum alloy ring is put into previously; cooling, then demolding to obtain a blank, carrying out heat treatment; turning off the aluminum alloy ring and other excessive blanks; and reclaiming the waste materials, and manufacturing into the aluminum alloy wheel rim product. In the method, the aluminum alloy ring is firstly arranged at the original hot spot of the low-pressure casting mold as one part of the bottom die, achieves the effect equivalent to the side wall of the die in the casting process, is finally molten with the product into a whole, and is turned off by machining, thereby fundamentally eliminating the problems of shrinkage cavity, looseness and difficult demolding as a result of the wall unevenness caused by the hot spot of the cast and ensuring the quality of the product. The method is applicable to the aluminum alloy wheel rim production by any casting method.

Description

The casting method of aluminium alloy wheel rim

Technical field

The present invention relates to a kind of manufacture method of the aluminium alloy wheel rim that suits on automobile, to use, particularly a kind of casting method that is used for aluminium alloy wheel rim.

Background technology

Along with developing rapidly of communication, the demand of aluminum-alloy wheel is increasing, and for satisfying different needs, wheel adopts different forming methods to make.Be meant that as gravitational casting molten metal injects the casting mold die cavity under the gravity effect.Low pressure casting is to make liquid metals the filling die cavity is forming a kind of method of foundry goods under pressure, and used pressure is low to be low pressure casting.Make wheel rim with casting method, have that technology is simple, production efficiency is high, production cost is low, therefore the advantage that suitable batch is produced adopts casting method to make more than the existing aluminium alloy wheel rim, have competitiveness.

Casting method is produced wheel rim, needing to make mould earlier could produce, also to rationally solve the release problems of mould simultaneously, form casting mold cavity by upper and lower mould and side form, to form thicker thermal center at three mould juncture areas, increase the thickness and the inhomogeneities of foundry goods, can't satisfy the well-balanced requirement of casting section thickness like this.

In addition for making the smooth demoulding of product, mould needs draw taper, also need consider to avoid the barb can't the demoulding, above-mentioned all situations all need to solve with the method that increases the technology wall thickness, if handle and to occur shrinkage cavity, phenomenon such as loose after the bad blank fine finishining, these defectives will directly influence the outward appearance and the intensity of product, become fatal defects.

Number of patent application 200810029293.0 " low pressure casting mould structure of aluminium alloy wheel rim ", though a kind of casting mould also is provided, on the counterdie limit, increase cast gate, and make it near from the thermal center distance, utilize cast gate temperature of aluminum liquid height, directly to the feeding of thermal center place to avoid producing shrinkage cavity, because of having increased cast gate at the thermal center place, also need increase equipment such as stalk and board, strengthen production cost.

The patent No. 200710027352.6 " aluminum-alloy wheel gas pressure casting device and casting method " also provides a kind of method of making wheel rim with casting method, but it also need increase by a cover casting device, has increased manufacturing cost greatly.

Summary of the invention

Technical problem to be solved by this invention is: a kind of casting method of aluminium alloy wheel rim is provided, need increase new equipment, generally cast producer and all can produce, production cost is low, improve product quality, reached the testing standard of wheel industry, satisfied the needs of automobile production producer.

The present invention addresses the above problem the technical scheme that is adopted: the procedure of processing of the casting method of aluminium alloy wheel rim:

1) selects materials: adopt aluminium ingot to produce aluminium alloy wheel rim, and adopt identical aluminium ingot to make an aluminum alloy ring, earlier aluminum alloy ring is put into baking box and be preheating to 390～410 ℃ and insulation with gravity casting as raw material;

2) aluminium ingot is inserted calciner and be warmed up to 740～760 ℃, pour aluminium water into crucible again and drop into the Mg alloy and Sr alloy and Ti alloy, carry out refining with the nitrogen degasification;

3) metal die with low pressure casting is preheating to 400～450 ℃, again the aluminum alloy ring that preheating is good is inserted on the step of bed die, push side form and patrix, board by air injection machine upwards is pressed into mold cavity by stalk from cast gate with the aluminium water that is refined in the crucible, after the cooled and solidified of cooling system, remove the side template that has side form, the cope match-plate pattern that has patrix, eject by the blank of patrix push rod with the aluminium alloy wheel rim made;

4) blank is through x-ray examination;

5) with qualified blank excision cast gate, put into the T4 heat-treatment furnace and carry out molten admittedly the processing, put into the T6 aging furnace after taking-up is quenched then and make Ageing Treatment;

6) blank after heat treatment falls aluminum alloy ring by lathe fine finishining turning and obtains the aluminium alloy wheel rim finished product with other blank surplus to designing requirement.

Compared with prior art, the invention has the advantages that: the method has increased an aluminum alloy ring at the heat energy-saving position of casting die, and be fixed on the step of bed die corresponding section, need not to increase cast gate and miscellaneous equipment, die casting up till now aluminum alloy ring replaces the position of former thermal center as the part of bed die, play the effect that is equal to mould side wall in the low pressure casting process again, therefore can prevent effectively that foundry goods from causing the even shrinkage cavity that produces of wall unevenness because of the existence of thermal center, solved simultaneously the problem of demoulding difficulty again, aluminum alloy ring adopts with the duplicate material of wheel rim blank and makes in addition, this aluminum alloy ring and wheel rim fusion form one after the die casting, through after the machining, from blank excision aluminum alloy ring and other blank allowance, waste material can continue to melt down use again, simultaneously the aluminum alloy ring simple shape, adopt easy gravity casting mould promptly plastic, easily make, cost is low, uses when the useful casting method of the suitable institute of the method is produced aluminium alloy wheel rim.

Description of drawings

Fig. 1, mould structure schematic diagram of the present invention (matched moulds state).

Fig. 2, mould structure schematic diagram of the present invention (not matched moulds state).

The structural representation of Fig. 3, aluminum alloy ring.

The structural representation of Fig. 4, aluminium alloy wheel rim blank.

The specific embodiment

Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.

Embodiment: the method with low pressure casting is made aluminium alloy wheel rim.

Production stage:

1) selects materials: adopt the A356 aluminium ingot to make raw material and produce aluminium alloy wheel rim, be raw material with identical A356 aluminium ingot simultaneously, method with gravity casting is made into aluminum alloy ring 11 earlier, and with aluminum alloy ring 11 put into baking box be preheating to 390～410 ℃ and the insulation, spray coat above noting be used in, the aluminum alloy ring endoporus has the taperings of 15～25 degree, the tapering that the outer surface lower end has the draw taper with the aluminium alloy wheel rim of producing to be complementary;

2) the A356 aluminium ingot is inserted calciner and be warmed up to 740～760 ℃, pour aluminium water into crucible again and drop into the Mg alloy and Sr alloy and Ti alloy, carry out refining with the nitrogen degasification;

3) metal die with low pressure casting is preheating to 400～450 ℃, the aluminum alloy ring 11 that directly will be incubated is then inserted on the step of casting bed die 10, bed die 10 is screwed on lower bolster 7, by 4 pull bars 1 four side forms 2 are pushed, and patrix 6, push rod plate 5, cope match-plate pattern 3 becomes whole by bolting, board by air injection machine drives the cope match-plate pattern matched moulds, by the board of air injection machine the aluminium water of refining in the crucible is passed through stalk, upwards be pressed into mold cavity from cast gate 8, cooled and solidified through cooling system 9 is made blank, open side form 2 then, upwards pull out patrix 6 to specified altitude by board, drive patrix by cope match-plate pattern 3 and rise, eject by the blank 12 of many patrix push rods 4 at last aluminium alloy wheel rim.

4) blank checks through x-ray examination whether blank has defectives such as shrinkage cavity, pore;

5) with behind the qualified blank excision cast gate, put into the T4 heat-treatment furnace and carry out molten admittedly the processing, put into the T6 aging furnace after taking-up is quenched then and make Ageing Treatment;

6) blank 12 after heat treatment falls aluminum alloy ring and other blank allowance to designing requirement by lathe fine finishining turning, obtains the aluminium alloy wheel rim finished product.

Claims

1. the casting method of an aluminium alloy wheel rim is characterized in that production stage:

4) blank is through x-ray examination;

2. the casting method of aluminium alloy wheel rim according to claim 1 is characterized in that adopting the A356 aluminium ingot to make raw material and makes aluminium alloy wheel rim.

3. the casting method of aluminium alloy wheel rim according to claim 1 is characterized in that described aluminum alloy ring (11) endoporus has the taperings of 15～25 degree, the tapering that the outer surface lower end has the draw taper with the aluminium alloy wheel rim of producing to be complementary.