Aluminum Alloy Die Castings

Aluminum alloy die castings products are mainly used in electronics, automobiles, motors, home appliances and some communication industries. Some high-quality aluminum alloy products with high performance, high precision and high toughness are also used in industries with high requirements such as large aircraft and ships. middle. The main use is still on the parts of some instruments. Since its establishment in 1997, Qinhuangdao Zhongwei Precision Machinery Co., Ltd. has mainly produced gravity casting, low pressure casting, high pressure casting, investment casting, etc. The company has built a reputation for gold with its excellent quality, making the other shore products quickly famous. at home and abroad. More than 70% of the products are exported to the United Kingdom, Germany, Japan, the United States, Taiwan and other countries and regions.

Product Dsecription

1. Implementation standards: the company strictly implements ISO9001, ISO14001, IATF16949 certification

The products have passed the certification of ROHS, FDA EU, etc.

2. Product material standards: ISO, GB, ASTM, SAE, ISO, EN, DIN, JIS, BS

3. Main processes: die casting process, investment casting, shell casting, deburring, sand blasting, machining, heat treatment, leak testing, surface treatment, etc.

4. Casting available materials:

Tin bronze, silicon bronze, aluminum bronze, brass, red copper, titanium alloy, high manganese steel, high chromium steel, high nickel steel, carbon steel, alloy steel, stainless steel, gray iron, cast iron, cast steel, cast aluminum, etc. Customized according to customer requirements.

Surface Treatment Process

Aluminum alloy materials in aluminum alloy die castings are mainly divided into three materials: aluminum-silicon alloy, aluminum-silicon-copper alloy, and aluminum-magnesium alloy.

Aluminum-silicon alloy: mainly includes YL102 (ADC1, A413.0, etc.), YL104 (ADC3, A360);

Aluminum-silicon-copper alloy: mainly includes YL112 (A380, ADC10, etc.), YL113 (3830), YL117 (B390, ADC14) ADC12, etc.;

Aluminum-magnesium alloy: mainly includes 302 (5180, ADC5,) ADC6, etc.

1. Phosphating of aluminum

The effects of accelerators, fluorides, Mn2+, Ni2+, Zn2+, PO4 and Fe2+ on the phosphating process of aluminum were studied in detail by means of SEM, XRD, potential-time curves, and film weight changes. Studies have shown that guanidine nitrate has the characteristics of good water solubility, low dosage and rapid film formation, and is an effective accelerator for phosphating of aluminum materials. Fluoride can promote film formation, increase film weight, and refine grains; Mn2+ and Ni2+ can significantly refine grains, make the phosphating film uniform and dense, and improve the appearance of the phosphating film; when the concentration of Zn2+ is low, the film cannot be formed Or the film formation is poor, with the increase of Zn2+ concentration, the film weight increases; PO4 content has a great influence on the phosphating film weight, and PO4 is increased. The content increases the weight of the phosphating film.

2. Alkaline electrolytic polishing process of aluminum

The research on the alkaline polishing solution system was carried out, and the effects of corrosion inhibitors and viscosity agents on the polishing effect were compared, and an alkaline solution system with good polishing effect was successfully obtained. Additives that improve longevity while also improving polishing results. The experimental results show that adding appropriate additives in NaOH solution can produce good polishing effect. The exploratory experiment also found that the reflectivity of the aluminum surface can reach 90% after DC electropolishing with NaOH solution of glucose under certain conditions. However, due to the unstable factors in the experiment, further research is needed. The feasibility of using DC pulse electrolytic polishing method to polish aluminum under alkaline conditions was explored. The results show that the use of pulse electrolytic polishing method can achieve the leveling effect of DC constant voltage electrolytic polishing, but its leveling speed is slow.

3. Environmentally friendly chemical polishing of aluminum and aluminum alloys

It is determined to develop a new environmentally friendly chemical polishing technology based on phosphoric acid monosulfuric acid, which should achieve zero emission of NOx and overcome the quality defects of previous similar technologies. The key to the new technology is to add some compounds with special effects to the base fluid to replace nitric acid. To this end, it is first necessary to analyze the triacid chemical polishing process of aluminum, especially the effect of nitric acid. The main function of nitric acid in chemical polishing of aluminum is to inhibit pitting corrosion and improve polishing brightness. Combined with the chemical polishing test in pure phosphoric acid-sulfuric acid, it is believed that the special substances added in phosphoric acid-sulfuric acid should be able to inhibit pitting corrosion, slow down general corrosion, and must have better leveling and brightening effects.

4. Electrochemical surface strengthening treatment of aluminum and its alloys

The process, properties, morphology, composition and structure of ceramic-like amorphous composite conversion films formed by anodic oxidation deposition of aluminum and its alloys in neutral systems were preliminarily discussed. The process research results show that in the Na_2WO_4 neutral mixed system, the concentration of the film-forming accelerator is controlled to be 2.5-3.0g/l, the concentration of the complexing-film-forming agent is 1.5-3.0g/l, and the concentration of Na_2WO_4 is 0.5-0.8g/l , the peak current density is 6~12A/dm~2, and weak stirring can obtain a gray series inorganic non-metallic film layer with complete uniformity and good gloss. The film thickness is 5-10 μm, the microhardness is 300-540HV, and the corrosion resistance is excellent. The neutral system has good adaptability to aluminum alloys, and can form films well on various series of aluminum alloys such as rust-proof aluminum and forged aluminum.

Post Casting Process

1. Heat treatment: annealing, carbonization, tempering, quenching, normalizing, surface tempering

2. Processing equipment: CNC, WEDM, lathe, milling machine, drilling machine, grinder, etc.;

3. Surface treatment: powder spraying, chrome plating, painting, sandblasting, nickel plating, galvanizing, blackening, polishing, bluing, etc.

Moulds and Inspection Fixtures

1. Mold service life: usually semi-permanent. (except for lost foam)

2. Mold delivery time: 10-25 days, (according to product structure and product size).

3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.

Quality Control

1. Quality control: the defective rate is less than 0.1%.

2. Samples and trial run will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements

3. Testing equipment: flaw detection, spectrum analyzer, golden image analyzer, three-coordinate measuring machine, hardness testing equipment, tensile testing machine;

4. Provide after-sales service.

5. The quality can be traced back.

Application

Aluminum alloy die castings products are mainly used in electronics, automobiles, motors, home appliances and some communication industries. Some high-performance, high-precision, high-toughness high-quality aluminum alloy products are also used in industries with high requirements such as large aircraft and ships. The main use is on the parts of some instruments.

Certicifation