阅读说明：本技术 一种轻量化发动机壳体及其制造方法 (Lightweight engine shell and manufacturing method thereof ) 是由 金华君 章晓海 于 2019-12-09 设计创作，主要内容包括：本发明公开了一种轻量化发动机壳体及其制造方法,涉及发动机壳体制造技术领域,其技术方案要点包括如下质量百分比的组分：Si：5.2-6.4%；Cu：0.95-1.03%；Fe：0.8-0.9%；Zn：0.32-0.46%；Mn：0.06-0.12%；Mg：0.10-0.15%；Ti：0.03-0.05%；Sn：0.015-0.024%；余量为Al。本发明具有获得在达到轻量化目的的同时仍旧具备高强度特性的发动机壳体,进而在该发动机壳体安装至车体上时,将在不影响车身强度的情况下,助于车身自重的降低,提升燃油经济性的效果。(The invention discloses a lightweight engine shell and a manufacturing method thereof, relating to the technical field of engine shell manufacturing, and the key points of the technical scheme are that the lightweight engine shell comprises the following components in percentage by mass: si: 5.2 to 6.4 percent; cu: 0.95 to 1.03 percent; fe: 0.8-0.9%; zn: 0.32-0.46%; mn: 0.06-0.12%; mg: 0.10 to 0.15 percent; ti: 0.03-0.05%; sn: 0.015-0.024%; the balance being Al. The invention has the advantages that the engine shell which achieves the aim of light weight and still has high strength characteristic is obtained, and when the engine shell is installed on a vehicle body, the effect of reducing the self weight of the vehicle body and improving the fuel economy is facilitated under the condition of not influencing the strength of the vehicle body.)

1. The light-weight engine shell is characterized by comprising the following components in percentage by mass: si: 5.2 to 6.4 percent; cu: 0.95 to 1.03 percent; fe: 0.8-0.9%; zn: 0.32-0.46%; mn: 0.06-0.12%; mg: 0.10 to 0.15 percent; ti: 0.03-0.05%; sn: 0.015-0.024%; the balance being Al.

2. A lightweight engine housing as set forth in claim 1, wherein: the outer surface of the engine shell is plated with an aluminum layer, and the thickness of the aluminum layer is 1-2 filaments.

3. A method for manufacturing a lightweight engine case, characterized by comprising the steps of:

step 1, adding 5.2-6.4% of Si, 0.95-1.03% of Cu, 0.8-0.9% of Fe, 0.32-0.46% of Zn, 0.06-0.12% of Mn, 0.10-0.15% of Mg, 0.03-0.05% of Ti, 0.015-0.024% of Sn and Al used as the balance by mass percent into a mixer to be uniformly mixed to form a raw material mixture;

step 2, adding the raw material mixture into the primary graphite crucible tongs, controlling the temperature to be 720-;

step 3, guiding the molten liquid to be cast into a casting machine for casting, and cooling to obtain a casting blank;

step 4, sequentially carrying out deburring, shot blasting, side leakage and carbonization cleaning on the casting blank, and drying to obtain a finished shell;

step 5, taking a finished shell for acid washing;

step 6, plating a tin-copper layer on the pickled finished shell;

step 7, putting the finished shell plated with the tin-copper layer into 670 ℃ aluminum water, and rotating the finished shell for 30s at a rotating speed of 60r/min by a rotator to plate a layer of aluminum on the finished shell;

and 8, cooling and obtaining the engine shell.

4. A method of manufacturing a lightweight engine case according to claim 3, characterized in that: the thickness of the tin-copper layer is less than 1 filament, and the ratio of tin to copper in the tin-copper layer is 2: (3-4).

5. The method for manufacturing the light-weight engine housing according to claim 3, wherein in the step 5, the pickling comprises soaking in 3% dilute sulfuric acid for 1min and then soaking in 50% nitric acid for 3 min.

6. A method of manufacturing a lightweight engine case according to claim 3, characterized in that: in the step 4, a suspension type shot blasting machine is adopted in the shot blasting process, casting blanks are subjected to suspension and blasting treatment, and the shot blasting is performed by using 0.2mm stainless steel shots.

7. A method of manufacturing a lightweight engine case according to claim 3, characterized in that: in step 4, the carbonization cleaning comprises vacuum cleaning, degassing cleaning and steam cleaning which are sequentially carried out.

8. A method of manufacturing a lightweight engine case according to claim 3, characterized in that: the set temperature of the carbonization cleaning is 180-220 ℃.

Technical Field

The invention relates to the technical field of manufacturing of engine housings, in particular to a light-weight engine housing and a manufacturing method thereof.

Background

An engine is a machine that can convert other forms of energy into mechanical energy. In order to effectively reduce the weight of the entire vehicle, casting of the engine case is currently being performed gradually using aluminum alloy instead of gray cast iron.

Chinese patent with publication number CN110195176A discloses a high-strength and high-toughness die-casting aluminum alloy and a preparation method thereof, which is characterized by comprising the following components in percentage by mass: 9 to 11.5 percent of Si, 78 to 4 percent of Cu2, 0.2 to 0.5 percent of Ni0.2 to 0.5 percent of Mg0.2 to 0.5 percent, 0.1 to 0.5 percent of Ti0.5 percent, 0.5 to 1.3 percent of Fe0, 0.5 percent of Mn, 0.02 to 0.3 percent of Sr0, 2 to 5 percent of SiC, 0.03 to 0.2 percent of Sm0, and the balance of aluminum.

However, the strength and mass of the engine housing forged by the die-casting aluminum alloy and the preparation method thereof are insufficient, and the driving performance of the automobile is affected, so that improvement is needed.

Disclosure of Invention

In view of the disadvantages of the prior art, a first object of the present invention is to provide a lightweight engine housing having the effect of achieving weight reduction while maintaining strength.

In order to achieve the purpose, the invention provides the following technical scheme:

a lightweight engine housing comprises the following components in percentage by mass: si: 5.2 to 6.4 percent; cu: 0.95 to 1.03 percent; fe: 0.8-0.9%; zn: 0.32-0.46%; mn: 0.06-0.12%; mg: 0.10 to 0.15 percent; ti: 0.03-0.05%; sn: 0.015-0.024%; the balance being Al.

The invention is further configured to: the outer surface of the engine shell is plated with an aluminum layer, and the thickness of the aluminum layer is 1-2 filaments.

The invention also provides a manufacturing method of the light-weight engine shell, which comprises the following steps:

step 1, adding 5.2-6.4% of Si, 0.95-1.03% of Cu, 0.8-0.9% of Fe, 0.32-0.46% of Zn, 0.06-0.12% of Mn, 0.10-0.15% of Mg, 0.03-0.05% of Ti, 0.015-0.024% of Sn and Al used as the balance by mass percent into a mixer to be uniformly mixed to form a raw material mixture;

step 2, adding the raw material mixture into the primary graphite crucible tongs, controlling the temperature to be 720-;

step 3, guiding the molten liquid to be cast into a casting machine for casting, and cooling to obtain a casting blank;

step 4, sequentially carrying out deburring, shot blasting, side leakage and carbonization cleaning on the casting blank, and drying to obtain a finished shell;

step 5, taking a finished shell for acid washing;

step 6, plating a tin-copper layer on the pickled finished shell;

step 7, putting the finished shell plated with the tin-copper layer into 670 ℃ aluminum water, and rotating the finished shell for 30s at a rotating speed of 60r/min by a rotator to plate a layer of aluminum on the finished shell;

and 8, cooling and obtaining the engine shell.

The invention is further configured to: the thickness of the tin-copper layer is less than 1 filament, and the ratio of tin to copper in the tin-copper layer is 2: (3-4).

The invention is further configured to: in step 5, the acid washing comprises soaking in 3% dilute sulfuric acid for 1min, and then soaking in 50% nitric acid for 3 min.

The invention is further configured to: in the step 4, a suspension type shot blasting machine is adopted in the shot blasting process, casting blanks are subjected to suspension and blasting treatment, and the shot blasting is performed by using 0.2mm stainless steel shots.

The invention is further configured to: in step 4, the carbonization cleaning comprises vacuum cleaning, degassing cleaning and steam cleaning which are sequentially carried out.

The invention is further configured to: the set temperature of the carbonization cleaning is 180-220 ℃.

In conclusion, the invention has the following beneficial effects:

1. after an aluminum layer with the thickness of 1-2 wires is oxidized in the air, a compact oxide layer is formed on the outer surface of the engine shell, so that the engine shell has the characteristic of high strength;

2. the obtained engine shell is plated with a tin-copper layer firstly, then plated with an aluminum layer in aluminum water, and tin materials in the tin-copper layer are replaced by the aluminum layer, so that the strength of a connecting structure of the aluminum layer and the engine shell is improved, and the engine shell still has high strength while achieving the purpose of light weight;

3. the obtained engine shell has the characteristics of achieving the aim of light weight and high strength, and when the engine shell is installed on a vehicle body, the engine shell can help to reduce the self weight of the vehicle body under the condition of not influencing the strength of the vehicle body, so that the fuel economy is improved.

Detailed Description