CN101885051A - Aluminum alloy low-pressure casting process for transfer case housing of concrete pump truck - Google Patents

Abstract

The invention discloses an aluminum alloy low-pressure casting process for a transfer case housing of a concrete pump truck. The process comprises the following steps of: (i) manufacturing a core; (ii) casting under low pressure; (iii) clearing a cast; (iv) quenching and aging; (v) blasting a shot and finishing; (vi) removing oil, (vii) machining, and the like. In the low-pressure casting process, ZL201 aluminum alloy is used as a raw material, and a cast transfer case housing has good thermal conductivity and cutting property and excellent mechanical properties, wherein the tensile strength is larger than or equal to 330MPa, the elongation is larger than or equal to 4 percent, and the hardness is larger than or equal to 90HB.

Description

Aluminum alloy low-pressure casting process for transfer case housing of concrete pump truck

Technical field

The invention belongs to a kind of low-pressure casting method, be specifically related to a kind of transfer case housing of concrete pump truck ZL201 aluminum alloy low-pressure casting process.

Background technology

Transfer case is the important intermediate transfer parts on the concrete transport vehicle, pump truck power passes to hydraulic pump by transfer case with engine power, the hydraulic pump match of promote living drives concrete pump work, and concrete is delivered to certain height and distance. and the pump truck engine is by the transfer case driving pump car that travels when not working

Continuous improvement along with execution conditions and environment, and the continuous development of jib manufacturing technology, long-armed pump truck more than 40 meters will become leading products, this just mean must adopt powerful engine and carrying turn round greatly the transfer case refused (at present power transmission shaft turn round refuse general: 32000Nm) this just requires transfer case both bearing capacity was big, enough rigidity and intensity are arranged again, for satisfying the requirement of performance characteristics, so the chief component housing of transfer case has been proposed special requirement.

The transfer case housing material of prior art is generally used ZL107, its process is with sand mo(u)ld and die cast, transfer case housing with this material manufacturing can only satisfy the pump truck of jib length below 35 meters, but its material can not satisfy high-power engine and the transfer case of refusing is turned round in carrying greatly.

Adopt its mechanical property of housing of low pressure casting: tensile strength 205MPa with ZL107; Percentage elongation 2%; Hardness 90HB.

At present, why transfer case casing shell casting adopts material ZL107 reason to have three: one, and the prices of raw and semifnished materials are lower; Its two, sand casting technology comparative maturity and easy to operate; Its three, still can satisfy the transfer case housing requirement of jib length below 35 meters though mechanical property is lower, this is the temporary transient no anti-act of pump truck transfer case user.But, can not satisfy the powerful engine of jib length more than 40 meters far away and carry and turn round the transfer case housing requirement of refusing greatly.

Summary of the invention

The present invention proposes for the shortcoming that overcomes the prior art existence, and its objective is provides a kind of transfer case housing of concrete pump truck ZL201 aluminum alloy low-pressure casting process.

Technical scheme of the present invention is: a kind of transfer case housing of concrete pump truck ZL201 aluminum alloy low-pressure casting process may further comprise the steps:

(i) coremaking

According to shape, the size of transfer case housing, need with covering the husky manufacturing mold core of mould for ease of depanning;

(ii) low pressure casting

With material is the aluminium alloy stock of ZL201, casts on the J4330 air injection machine, and cast temperature is that 700～740 ℃ of the blowing pressures are 0.1～0.38MPa;

(iii) clear up foundry goods

Cleaning casting fin cast gate etc.;

(iv) quench and the timeliness processing

Quench earlier: 535 ± 5 ℃ of heating-up temperatures, temperature retention time 7～9 hours, 60～100 ℃ of water temperatures are carried out natrual ageing then, 175 ± 5 ℃ of heating-up temperatures, temperature retention time 3～5 hours, air cooling;

(v) ball blast polishing

With hook type 378 sand-blasting machines, usefulness stainless steel ball ball blast polishing, steel ball size selects 0.5mm;

(vi) oil removing

Clean with degreaser;

(vii) machined

After the oil removing, carry out machined again.

The transfer case housing of using cast of the present invention has good thermal conductivity, so the perfect heat-dissipating of housing has good machinability, its good mechanical performance, tensile strength 〉=330MPa; Percentage elongation 〉=4%; Hardness 〉=90HB.

Description of drawings

Fig. 1 is an aluminum alloy low-pressure casting process for transfer case housing of concrete pump truck block diagram of the present invention.

Wherein:

1 coremaking, 2 low pressure castings

3 cleaning foundry goods 4 quench and timeliness is handled

6 oil removings of 5 ball blast polishings

7 machineds

The specific embodiment

Below, in conjunction with the accompanying drawings and embodiments transfer case housing of concrete pump truck of the present invention is elaborated with the ZL201 aluminum alloy low-pressure casting process:

As shown in Figure 1, a kind of aluminum alloy low-pressure casting process for transfer case housing of concrete pump truck may further comprise the steps:

(i) coremaking

According to shape, the size of transfer case housing, need with covering the husky manufacturing mold core of mould for ease of depanning;

(ii) low pressure casting

With material is the aluminium alloy stock of ZL201, casts cast temperature on the J4330 air injection machine: 700～740C the blowing pressure: 1～3.8Kg/cm;

Wherein, the trade mark of the aluminium alloy of ZL201 is: ZALCuMn (GB1173-86), and the percentage by weight of each composition is:

Cu?4.5％～5.3％?Mn?0.6％～1.0％?Ti?0.15％～0.35％

S 0.3％ Si?0.3％ Zn?0.2％

Sn 0.2% Pb 0.05% Al surplus

(iii) clear up foundry goods

Cleaning casting fin cast gate etc.;

(iv) quench and the timeliness processing

Quench earlier: 535 ± 5 ℃ of heating-up temperatures, temperature retention time 7～9 hours, water temperature: 60～100 ℃, carry out natrual ageing then, 175 ± 5 ℃ of heating-up temperatures, temperature retention time 3～5 hours, air cooling;

(v) ball blast polishing

With hook type 378 sand-blasting machines, usefulness stainless steel ball ball blast polishing, steel ball size selects 0.5mm;

(vi) oil removing

Clean with degreaser;

(vii) machined

After the oil removing, carry out machined again.

The transfer case housing of using cast of the present invention has good thermal conductivity, so the perfect heat-dissipating of housing has good machinability, its good mechanical performance, tensile strength 〉=330MPa; Percentage elongation 〉=4%; Hardness 〉=90HB.

Claims (1)

1. aluminum alloy low-pressure casting process for transfer case housing of concrete pump truck is characterized in that: may further comprise the steps:

(i) coremaking

According to shape, the size of transfer case housing, need with covering the husky manufacturing mold core of mould for ease of depanning;

(ii) low pressure casting

With material is the aluminium alloy stock of ZL201, casts cast temperature on the J4330 air injection machine: 700～740C the blowing pressure: 1～3.8Kg/cm;

(iii) clear up foundry goods

Cleaning casting fin cast gate etc.;

(iv) quench and the timeliness processing

Quench earlier: 535 ± 5 ℃ of heating-up temperatures, temperature retention time 7～9 hours, 60～100 ℃ of water temperatures are carried out natrual ageing then, 175 ± 5 ℃ of heating-up temperatures, temperature retention time 3～5 hours, air cooling;

(v) ball blast polishing

With hook type 378 sand-blasting machines, usefulness stainless steel ball ball blast polishing;

(vi) oil removing

Clean with degreaser;

(vii) machined

After the oil removing, carry out machined again.

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