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A vacuum die-casting method for aluminum alloy cylinder without cylinder liner

A technology of vacuum die casting and aluminum alloy, applied in the field of engine aluminum cylinder block casting, can solve the problems of low yield, high cost of mass production, low efficiency, etc., to improve yield and production efficiency, reduce manufacturing costs, and improve production. The effect of efficiency

Active Publication Date: 2018-09-11
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristics of low-pressure casting determine its slow beat, at least about 10 minutes. Under the same production capacity, the investment cost of equipment is much higher than that of die-casting and gravity casting, which leads to high production costs and even offsets the linerless aluminum alloy cylinder itself. cost advantage
In contrast, the investment cost of the gravity casting process is low, but it also has the characteristics of low efficiency, difficult process control, and poor quality stability
However, the traditional die-casting process is difficult to control the internal air hole defects of castings. Many castings are scrapped because they cannot meet the internal quality of aluminum alloy cylinder castings without cylinder liners, especially because the quality requirements of the cylinder hole position are not up to standard. The yield rate is low and the mass production cost is relatively high. high
The shortcomings of the above three processes limit the mass production of linerless aluminum alloy cylinder blocks, making it difficult to popularize and apply linerless aluminum alloy engines on a large scale

Method used

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  • A vacuum die-casting method for aluminum alloy cylinder without cylinder liner

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Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: A method for vacuum die-casting of an aluminum alloy cylinder block without cylinder liner, comprising the following steps:

[0033] 1) Melting: Melt the material ADC12 at 740±20°C, the proportion of new material is not less than 70%, then pour out the molten aluminum for refining and degassing, the temperature of the furnace is 740°C, the refining temperature is 700°C, the degassing time 5min,

[0034] 2) Heat preservation: put the molten aluminum prepared in step 1) in a heat preservation furnace at a heat preservation temperature of 660°C. If the aluminum liquid in the heat preservation furnace exceeds 4 hours, it needs to be deslagged. If the aluminum water exceeds 8 hours, it needs to be degassed and slag removed again. And carry out chemical composition analysis, qualified before use, aluminum water exceeds 48h, need to carry out ingot casting treatment;

[0035] 3) Mold pretreatment:

[0036] a. Preheat the mold in the cold mold state, and control...

Embodiment 2

[0043] Embodiment 2: A method for vacuum die-casting of an aluminum alloy cylinder block without cylinder liner, comprising the following steps:

[0044] 1) Melting: The material ADC12 is melted at 740±20°C, the proportion of new material is not less than 70%, and then the molten aluminum is poured out for refining and degassing. The furnace temperature is 720°C, the refining temperature is 740°C, and the degassing time is 10min,

[0045] 2) Heat preservation: Put the molten aluminum prepared in step 1) in a heat preservation furnace at a heat preservation temperature of 680°C. If the aluminum liquid in the heat preservation furnace exceeds 4 hours, deslagging treatment is required; if the aluminum liquid exceeds 8 hours, degassing and slag removal is required. And the chemical composition analysis is carried out, and it can be used only if it is qualified; if the aluminum water exceeds 48 hours, it needs to be cast into ingot;

[0046] 3) Mold pretreatment:

[0047] a. Preh...

Embodiment 3

[0054] Embodiment 3: A method for vacuum die-casting of an aluminum alloy cylinder block without cylinder liner, comprising the following steps:

[0055] 1) Melting: The material ADC12 is melted at 740±20°C, the proportion of new material is not less than 70%, and then the molten aluminum is poured out for refining and degassing. The furnace temperature is 760°C, the refining temperature is 720°C, and the degassing time is 7min,

[0056] 2) Heat preservation: Put the molten aluminum prepared in step 1) in a heat preservation furnace with a heat preservation temperature of 670°C. If the aluminum liquid in the heat preservation furnace exceeds 4 hours, it needs to be deslagged. If the aluminum water exceeds 8 hours, it needs to be degassed and slag removed again. And carry out chemical composition analysis, qualified before use, aluminum water exceeds 48h, need to carry out ingot casting treatment;

[0057] 3) Mold pretreatment:

[0058] a. Preheat the mold in the cold mold st...

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Abstract

The invention discloses a vacuum die casting method of aluminum alloy cylinders without cylinder sleeves. The method comprises process steps of smelting, heat preservation, die pretreatment, feeding, press shooting, vacuumizing and die opening. The aluminum alloy cylinders are produced in batches through the vacuum die casting method, the gas containing content of a casting can be reduced, the casting quality and performance can reach the standard, and the yield of the casting can be improved; the production efficiency is improved, and the production and manufacturing cost can be reduced.

Description

technical field [0001] The invention relates to a casting method for an aluminum cylinder block of an engine, which belongs to the technical field of casting, and in particular to a vacuum die-casting method for an aluminum alloy cylinder block without a liner. Background technique [0002] The linerless aluminum alloy cylinder block is also called integral aluminum alloy cylinder block. There is no traditional cast iron cylinder liner, and all of them are casted with aluminum alloy materials; There are strict requirements. In order to reduce the air content as much as possible, the current production of linerless aluminum alloy cylinder blocks mainly adopts low-pressure casting and gravity casting processes, of which low-pressure casting can be applied to mass production, while gravity casting is only used for single-piece or Small batches. [0003] The use of die-casting technology to produce linerless cylinder blocks has the advantages of low investment, high efficiency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02B22D17/00B22D27/15
CPCB22D17/00B22D27/15C22C21/02
Inventor 韩洁丽宗笑泉城弘毅黎健曾云波李莉
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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