How to solve the problem of aluminum die casting surface strain

     The characteristics of aluminum die casting surface strain:
(1)The opening direction along the casting surface is line strain marks, there is a certain depth, the entire surface of serious injury;
(2)The metal liquid and the mold surface stick and, cause the casting surface lack of material.
     Produce reason:
(1)The mold cavity surface has the damage;
(2)The direction of the mold release has no inclination or inclination is too small;
(3)The mold release is not balanced;
(4)The mold is loose;
(5)The casting temperature is too high or too low, high temperature led to the adhesion of liquid alloy mould;
(6)The stripping agent effect is not good:
(7)The iron content of less than 0.8% in aluminum die casting materials;
(8)The cooling time is too long or too short.
     Treatment method:
(1)Repair mold surface damage;
(2)Correction of inclination and improve the mold surface finish;
(3)Adjust the top lever, balance the push out;
(4)The fastening mould;
(5)The control of pouring temperature and mold temperature at 180~250 °C;
(6)Replacement release agent;
(7)Adjust iron content of aluminium alloy;
(8)The adjustment of cooling time;
(9)To modify the gate, change the direction of liquid aluminum.

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How to keep the temperature of magnesium alloy die casting mould

     In the die casting production, stable mould temperature is favorable for the production rhythm and casting quality and mould life. And compared with aluminum alloy, magnesium alloy heat capacity is small, so most aluminum alloy die casting mold often need to use water cooling, the magnesium alloy die casting mould needs to be heated to meet the normal production, especially the production of certain thin-walled parts. Some die casting factory to heating mould with flame gun, this method is not suitable for magnesium alloy die casting. Because it is hard to guarantee the mold temperature uniformity, the mold because the hot and cold uneven and produce cracks. And because the latent heat of magnesium alloy is low, when production the thin-walled parts in order to maintain stable production and good filling conditions, you need to continuously heat the mold to maintain the mold temperature stable. For magnesium alloy die casting, the most ideal heating way is uses the mold temperature control machine to heat up the mold.
     The mold temperature control machine uses the High thermal conductivity medium, can pass the heat to the mold in a short time. Mold temperature machine commonly used has two kinds, one is the hot water mold temperature control machine, the other is a hot oil mold temperature control machine. In the case of sealing heating, due to the boiling point of water, the maximum temperature of the mould temperature can only reach 140 ~160. High temperature liquid magnesium and water will react violently, if the high pressure cooling water leak may cause explosion risk. When the magnesium alloy die casting, the mold temperature usually must remain at 180 °C ~280 °C. Therefore, the hot water mold temperature control machine is seldom used in the magnesium alloy die casting. Hot oil mold temperature control machine is often used to magnesium alloy die casting production, the heat conduction oil boiling point is higher, use temperature is higher than that of water, to the mold heat is more uniform and constant. The use of hot oil mold temperature control machine temperatures may reach above 300 °C.

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What are the light alloy casting industry model

     At present, the light alloy die casting industry model is divided into three types:
1. Single link manufacturers: small scale, R & D design and production capacity is limited, the product and production capacity are concentrated in the middle and low level.
2. Multi link manufacturers: with a certain size, strong R & D design and production capacity, able to provide the production and finishing of the pressure casting and other services.
3. With core technology and complete industrial chain of precision light alloy die casting manufacturers: have a product design, mold design and production, die casting, finishing, surface treatment, spraying complete industrial chain. This category of enterprises through the provision of product design, manufacturing, assembly and after-sales service to enhance the value-added ability of enterprises.

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The development trend of die casting mould making

     In order to adapt to the user's short delivery time, high precision and low cost requirements in mould manufacturing, the development trend of die casting mould making will toward the development of these several aspects.
(1) Mold design from the experience design stage to the theoretical calculation and computer aided design direction development, CAD / CAM / CAE technology widely used in die casting mold making, make the mould structure is more scientific and reasonable, greatly improve the machining precision of the mold, the production cycle of the die casting mould is shortened, reduce the product development time.
(2) CAD/CAE/CAM die casting mold making is developing in the integration, 3D, intelligent and network.
(3) Improve the standardization of the mold and the standardization of the mold utilization rate.
(4) Die to precision, complex, large-scale direction of development.
(5) Knowledge based engineering technology (KBE).

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The development trend of tool metal stamping parts supplier

     At present, China's metal stamping product exports increased, the tool metal stamping parts supplier also usher in a new pattern of foreign trade.
     1. The structure of the export commodities is further optimized, the export of high-tech products increased significantly. Clip to cutting tools such as wire rope cutting, wire cutting pliers, saw frame, machine repair tools, telecommunications, household combination of tools and set series, steel tape measure, level instrument and other measuring series and socket wrench, impact batch fastening series products. A number of high-tech and high value-added exports of these products gradually replace the original low value-added hardware stamping products, which holds the largest proportion of cutting and group products.
     2. Progress of diversification strategy. Dealers in consolidating original Southeast Asia and America and other traditional markets at the same time, and actively adjust the product management structure, change between subject and object of the sales model, and strive to open up Africa, Europe and other markets.
     3. The strength of our metal stamping parts supplier is increasing. The export of large distributors and dealers integrity of products go hand in hand, both metal stamping products export growth rate far exceeds the general business households.
     4. Homegrown brand processing trade is growing rapidly. China's metal stamping processing trade enterprises should assess the situation and make timely measures, actively participated in the exhibition, improve product quality, increase product innovation, according to the international economic situation to vigorously to create a low carbon products, understand the metal stamping products exports to the EU standards, thus expanding foreign markets, improve our country hardware stamping products in the international market share.

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Status quo of auto die casting parts manufacturer

     Die casting industry is one of the important supporting industries in the automobile industry, and has been closely related to the development of automobile. In recent years, the rapid development of the automobile industry has led the development of the auto die casting manufacturers, and has given its broad development prospects. Now, with the development of automobile manufacturing technology, die castings are also facing new technical challenges, the structure of die casting industry is undergoing tremendous changes.
     The application of die casting is very wide, and it involves a lot of products and industry categories. In all these applications, the automobile industry is ranked first in the number of large varieties, strict requirements, high quality and high metal materials, etc.. For a long time, the automobile industry has been the biggest market in the die casting industry. In recent years, the development of China's automobile industry has been pushing the die casting parts manufacturer into a new development period.

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How to solve the defects of zamak die casting

    In the die casting production the quality problem encountered are many, and its reasons are also many aspects. We must make the right judgement on the quality of the casting. Find out the real cause and propose effective measures to improve the casting quality.
    Here we list the defects of zamak die casting and the corresponding solution.
1. Cold lattice. Improve the temperature of material temperature and mould, press the injection speed, modify the injection port and improve the exhaust function.
2. Flow mark. It is necessary to improve the temperature of feed liquid, the temperature of mould, the pressure of injection, reduce the dosage of the release agent, when necessity may consider the revision mold feeding direction or the ingate area.
3. Porosity. Zamak die casting material can not have oil, water and dirt, prevent foreign gas into the melt. After the melting of raw materials for refining to remove gases, temperature is not too high.
4. Crack. Reduce the time of holding the pressure, improve the mold temperature. If the problem is not solved, then check ejection angle, distribution of mold thimble, analysis wall thickness, avoid sharp change in wall thickness and lead to excessive stress.
5. Shrinkage. To increase the ratio of pressure, increase the opening time, reducing pouring temperature. If the structural design of the workpiece is caused, you need to increase the partial pressure or modify the structure design.
6. Burn mold / Buckle mold. Appropriate reduction of material temperature, mold temperature, and injection speed. Appropriate multi injection mold release agent on firing parts. In the mold, the R angle is increased, so that the mold filling is more stable, and avoid directly impacting cavity side wall. Feed head direction and size inspection, when necessity the fever buckles the spot to make the removable structure. Uses high tech coating, increases this spot degree of hardness and the intensity.

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Flame proof technology of magnesium die casting melt

    Salt flux. Salt solvent at a temperature of 400 °C, in the molten state covering on the surface of the magnesium die casting melt, cut off the magnesium liquid in contact with the air, preventing magnesium oxidation reaction, salts, based on the carnallite and coupled by MgCl2 and KCl composed of low melting point eutectic mixture, adding high melting point fluorite powder (CaF2) about 20%. In addition as the outer cover and the melt purification. Cover the protective effect of salt can be maintained at 800 °C. The disadvantage of the salt flux is in contact with moist air to produce corrosive chloride and hydrochloric acid gas formation, have great effects on machinery and equipment, and working environment. In addition, the salt flux is easily formed in the inclusion in the casting, casting quality damage.
    Inert gas. At present in the industrial application of a large number of nitrogen and argon can be used to protect the magnesium die casting melt, the purpose of which is to cut off the oxygen source, nitrogen can prevent combustion, and Mg slow reaction, generate powderlike Mg3N2 membrane, the door temperature below 650 °C and Ar gas will not be and mg occurred reaction, but there are still mg evaporation.
    Inhibitory element. The elements of the inhibition are Be, Ca, Zn. Beryllium have a high diffusion velocity in magnesium die casting melt,The generated BeO has high thermodynamic stability and small volatile tendency. BeO at the surface of the melt formation pressure stress, in the melt coverage have enough BeO, density coefficient is 1.68, played the role of a good protection.
    Reactive gas. SO2 and SF6 can be used as reactive gas for the protection of molten magnesium alloy die casting materials, temperature up to 740 °C. Consumption of SO2 in the atmosphere accounted for only 1% of the total volume, in the foundry workshop as protective gas cost minimum, but has the following disadvantages: in and exposed to the air generated by the reaction of sulfuric acid and the formation of gaseous SO3 and the machine and peripheral equipment to promote corrosion. The use of quality steel for all equipment accessories and pipes. -- SO2 and SO3 are toxic and irritating odor, harmful to human health. SO2 and SO3, at very low concentrations, also have good protective effect and SF6 non-toxic, SF6 and molten magnesium contact together constitute a MgF2 dense protective layer.

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How to choose the plant locations for die casting manufacturer

    How to choose the plant locations for die casting manufacturer, need comprehensive survey of the geography, geology, climate conditions, raw materials, fuel and power supply, transportation and other ancillary industrial supply, etc.. Ensure convenient transportation, abundant raw materials, water, electricity, gas and other energy resources, and supporting industrial sound and maximally save manpower, material resources, transportation, energy and environmental protection cost. Die casting manufacturer plant scale, determined according to their own economic conditions, the production task and future prospects for development, must can meet current production needs of enterprises, and for the future development of leaving enough space. For large die casting project, can installment investment, to make full use of the capital and human.

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Zinc die casting production parameters and requirements

    The zinc die casting production generally used hot chamber die casting machine, its production parameters and requirements are as follows:
1. The furnace temperature: production, set to 410 °C to 430 °C;
2. Gooseneck temperature: production, set to 380 °C to 420 °C;
3. The nozzle temperature: set at between 400 °C to 440 °C production;
4. The hammer head and material pot coordination: playing material without stacker;
5. Fever cake: heat at the contact with the plane cake feeding pot agreement, no distortion, no alloy material adhesion, corrosion;
6. fever sets: surface clean and free of corrosion;
7. alloy surface: no dross, keep it clean, alloy crucible level of not less than one inch;
8. Cooling water pressure: Make sure the pressure is 3 ~ 5Kg / cm²;
9. Stands carrying water: Make sure the outlet temperature below 30 °C;
10. The zinc die casting feeding requirements: zinc raw material plus seventy percent; about 30 percent plus outlet material; high-end products full plus new material.

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The principle of aluminum die casting process

     The principle of aluminum die casting process is the liquid metal quickly into the precision metal mold cavity by high pressure, the liquid metal solidification under pressure and the formation of castings. Cold chamber die casting and hot chamber die casting are the two basic ways of die casting process.  In the cold chamber die casting, molten metal into the pressure chamber by manual pouring device or automatic pouring device, then the plunger forward, the molten metal into the cavity. In the hot chamber aluminum die casting, pressure chamber perpendicular to the crucible, the molten metal automatically flows into the pressure chamber by the pressure chamber inlet. Plunger downward movement, push the molten metal into the cavity through the gooseneck. The molten metal is solidified, open die casting mould, remove the castings, the completion of a die casting cycle.

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Magnesium alloy die casting production safety precautions

     In the process of magnesium alloy die casting production, the most important thing is to keep the site clean, dry. Each boot should be preheated to 150 degrees above the mold, do not spray too much paint spraying, so as to avoid cavity seeper, cause danger. Try not to use cold water to cool down the punch and mould. The punch can use air-cooled, heating and cooling mold generally using high temperature resistant oil. Magnesium alloy die casting punch speed is faster than aluminum alloy die casting, to avoid flying material wounding, sometimes in the die parting face with a flying material baffle, die casting and safety doors must be closed, the operator stand in the parting surface is forbidden. Waste production site must be cleared up, can be placed in a dry non-combustible container. Fly ash and dust also to clean up. From the fire accident around the magnesium die casting the actual occurrence of the factory, more than 50% by the processing of magnesium dust, waste such as cleaning and storage problems caused, some occurred in the processing process, resulting in melting link accidents accounted for about 10%.

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