What is the most advanced casting method?

Lost foam casting is currently the most advanced casting process in the world.

One of them, known as a revolution in the history of casting, is the 21st century "green intensive casting of the main way", will occupy an increasingly important position in the casting production.

1. Lost foam casting is also known as negative compaction casting (EPC). It is a foam type made of expandable polystyrene ethylene (EPS) as raw material, according to the effective and reasonable combination of the sand box volume, painted with special coating, after drying, buried in the negative pressure sand box with dry sand without moisture, binders and other additives, and the casting method of metal liquid pouring under appropriate negative pressure after microshock compaction, the casting surface made by this method is smooth, the size is accurate, and there is no flash burr. The advantages of the specific lost foam casting process are as follows:

1. The size and shape of the casting are accurate, the copyability is good, and it has the characteristics of precision casting; The surface finish of the casting.

High; 2 .The sand core and core making department were cancelled, and the casting defects and scraps caused by core making and core setting were eliminated; 3.The non-closing and non-taking of the mold greatly simplifies the modeling process and eliminates the casting defects and waste products caused by the taking of the mold and the closing of the box; 4.

The use of binder-free, water-free, and additive-free dry sand molding, ** eliminates various casting defects and rejects caused by moisture, additives and binders; 5.The sand treatment system is greatly simplified, and the molding sand can be reused in full, and the molding sand preparation department and the waste sand treatment department are canceled; 6.It is extremely easy to shake the sand, which greatly reduces the workload and labor intensity of the shakeout; 7.

There is no flash burr in the casting, which reduces the cleaning and grinding workload by more than 50; 8.A gating riser with a reasonable shape can be set in the ideal position, which is not restricted by traditional factors such as parting and molding, and reduces the internal defects of the casting; 9.Negative pressure pouring is more conducive to the filling and shrinkage of liquid metal, and improves the microstructure density of castings; 10.

Combined pouring, one box with multiple pieces, greatly improves the process export rate and production efficiency of castings;

Laser additive manufacturing. The processed material is made into a powder, which is then heated and melted by a laser according to the CAD pattern scanning.

Casting is a kind of metal thermal processing technology that has been mastered by human beings for about 6,000 years.

Between about 1700 BC and 1000 BC, China had entered the heyday of bronze casting, and the craftsmanship had reached a very high level.

Casting is a method of casting liquid metal into a casting cavity that is suitable for the shape of the part, and waiting for it to cool and solidify to obtain the part or blank.

Most of the materials to be cast are metals that were originally solid but heated to a liquid state (e.g., copper, iron, aluminum, tin, lead, etc.), while the materials of the casting molds can be sand, metal or even ceramics.

Depending on the requirements, the methods used will vary.

There are two main categories: sand casting and special casting.

1. Ordinary sand casting, using sand as casting mold material, also known as sand casting, turning sand, including green sand mold, dry sand mold and chemical hardening sand mold 3 categories, but not all sand can be used for casting.

The advantage is that the cost is lower because the sand used in the casting mold is reusable; The disadvantage is that the casting mold is time-consuming, and the casting mold itself cannot be reused, and it must be destroyed before the finished product can be obtained.

Sand mold (core) casting method: wet sand mold, resin self-hardening sand mold, water glass sand mold, dry type and surface dry mold, solid casting, negative pressure molding.

Sand core manufacturing method: It is selected according to the size, shape, production batch and specific production conditions of the sand core.

In production, it can be divided into manual core making and machine core making in general.

2. Special casting, according to the modeling material, can be divided into two categories: special casting with natural mineral sand and gravel as the main molding material (such as investment casting, clay casting, shell casting, negative pressure casting, solid casting, ceramic casting, etc.) and special casting with metal as the main casting material (such as metal mold casting, pressure casting, continuous casting, low-pressure casting, centrifugal casting, etc.).

Metal mold casting method.

Casting molds are made from metals with a higher melting point than raw materials.

Among them, it is subdivided into gravity casting method, low-pressure casting method and high-pressure casting method.

Due to the melting point of the casting mold, there are also restrictions on the metals that can be cast.

Lost-wax casting.

This method can be used for outer film casting and solid casting.

The object to be cast is reproduced with wax, then immersed in a pool containing ceramic (or silica sol) and allowed to dry, so that the wax replica is covered with a ceramic outer film, and the process is repeated until the outer film is large enough to support the casting process (about 1 4 inches to 1 8 inches), then the wax in the mold is melted and the mold is extracted.

After that, the casting mold needs to be applied to high temperature several times to enhance the hardness before it can be cast.

This method has good accuracy and can be used for casting metals with high melting points, such as titanium.

However, due to the high level of ceramics and the need for many times of heating and complexity to make, the cost is quite expensive.

Among the various methods of casting production, the most basic method is sand casting.

1. Advantages:

The production cost is low, the casting performance is good, it is easy to cut and process, the shock absorption and wear resistance are good, the notch-sensitive person has low inductance and has good heat treatment performance.

Second, the disadvantages:

When the casting production process is more and the feeding material is not good, the quality of the casting is not stable enough, the scrap rate is relatively high, and the working conditions and working environment are also poor.

Third, the characteristics of casting production:

1. It has a wide range of adaptation, and is not limited by the size, thickness and complexity of the casting, and the production mode is flexible.

2. It can use a wide range of materials, can make a large use of scrap metal and renewable resources, and has less power consumption compared with forging.

3. The casting has a certain dimensional accuracy, small machining allowance, and saves processing man-hours and metal materials.

4. Low cost, good comprehensive economic performance, low energy, material consumption and cost.

Fourth, the commonly used casting methods are:

1. Ordinary sand mold casting, including three types: green sand mold, dry sand mold and chemical hardening sand mold.

2. Special casting, according to the modeling material, can be divided into two categories: special casting with natural mineral sand and gravel as the main modeling material (such as investment casting, mud casting, shell casting in the foundry, negative pressure casting, solid casting, ceramic casting, etc.) and special casting with metal as the main casting material (such as metal mold casting, pressure casting, continuous casting, low talk about forest pressure casting, centrifugal casting, etc.).

Hello, regarding your question, I have consulted some information, I hope it will be helpful to you:

First, the definition of casting:

Casting is a molding method of smelting metal, manufacturing a casting mold, pouring molten metal into the casting mold, and obtaining a metal part blank with a certain shape, size and performance after solidification.

Clause. Second, the principle of casting is:

Casting is the process of smelting metal into a liquid that meets certain requirements and pouring it into the casting mold, and obtaining a casting with a predetermined shape, size and performance after cooling and solidification and cleaning treatment. Because the casting blank is almost formed, the purpose of eliminating machining or small amount of processing reduces the cost and reduces the production time to a certain extent

Clause. 3. The casting process (currently divided into eight categories):

1.sand casting;

2.precision casting, also known as lost wax casting, investment casting;

3.Lost foam casting ;

4.Die casting, also known as pressure casting;

5.Centrifugal casting ;

6.Gypsum casting ;

7.Continuous casting ;

8. Metal mold casting, etc.

In short, casting is one of the basic processes of the modern device manufacturing industry.

Hope it helps, o(o

The principle of low-pressure casting: it is to introduce dry compressed air or inert gas into a sealed container, so that the molten metal in the container can pass through the riser tube and the pouring system from bottom to top under the gas pressure, and smoothly enter the casting mold, and maintain the gas pressure in the container until the casting is completely solidified, and then relieve the pressure on the liquid surface to make the riser tube and.

First of all, make a wax model, generally with a wax injection machine or the like, then dip the slurry, pour sand, then dip the slurry, and then drench the sand, about seven or eight times (remember that it is, first pour coarse sand, then medium sand, and finally fine sand), and then use a dewaxing kettle or water bath to remove the wax, and then sinter, and then you can cast. After a series of steps such as vibration shelling, grinding gate, etc., it can be put into storage.

Casting is a more economical method of blank forming, and it can show its economy for parts with complex shapes. Such as the cylinder block and cylinder head of automobile engines, ship propellers, and exquisite works of art. Some hard-to-cut parts, such as nickel-based alloy parts of gas turbines, cannot be formed without casting.

In addition, the size and weight of cast parts are suitable for a wide range, and the metal types are almost unlimited; While the parts have general mechanical properties, they also have comprehensive properties such as wear resistance, corrosion resistance, and shock absorption, which cannot be done by other metal forming methods such as forging, rolling, welding, and punching. Therefore, in the machine building industry, the number and tonnage of raw parts produced by the casting method are still the largest.

The materials commonly used in casting production include various metals, electricity, coke, wood, plastics, gaseous and liquid fuels, molding materials, etc. The required equipment includes various furnaces for smelting metals, various sand mixers for sand mixing, various molding machines and core making machines for modeling and core making, sand shakeout machines and shot blasting machines for cleaning castings. There are also machines and equipment for special foundries as well as many transport and material handling equipment.

Casting production has different characteristics from other processes, mainly because of wide adaptability, more materials and equipment required, and environmental pollution. Casting production produces dust, harmful gases and noise pollution to the environment, which is more serious than other machinery manufacturing processes, and needs to be controlled by measures.

For foundry engineers and mechanical structure design engineers, heat treatment is a very meaningful and valuable method to improve the quality of materials, through heat treatment can change or affect the structure and properties of cast iron, and at the same time can obtain higher strength, hardness, and improve its wear resistance.

Due to the different purposes, there are many types of heat treatment, which can be basically divided into two categories, the first is that the organizational structure will not change or should not be changed by heat treatment, and the second is the basic organizational structure change. The first heat treatment procedure is mainly used to eliminate the internal stress, which is caused by different cooling conditions and conditions in the casting process. Structure, strength and other mechanical properties, etc., do not change significantly due to heat treatment.

1.Directly formed from liquid metal, convenient and low-cost.

2.It has good adaptability and can be used for various alloy forming.

3.It is flexible and can be used for various mass production.

4.It can manufacture pieces of various sizes, from a few grams to hundreds of tonsIt can manufacture parts of various complexities.

Characteristics and working process of casting production.

Aluminum alloy gold gravity casting Henan Dashan non-ferrous metal production refers to the process of injecting aluminum into a mold under the action of gravity. Gravity casting production is divided into: sand casting production, metal mold (steel mold) casting production and lost foam casting production.

Nowadays, gold is a type of mold (steel mold) casting. The mold is made of heat-resistant gold steel. The strength, size and appearance of cast aluminum castings are higher than other casting production processes.

Molten aluminium produced by gravity casting is usually poured manually into the gate. It Henan Dashan non-ferrous metals rely on the dead weight of the gold liquid to fill the cavity, vent, cool and mold to obtain samples. The process generally is:

Molten aluminum melting, pouring, exhausting, cooling, mold opening, cleaning, heat treatment, processing.

The characteristics of aluminum alloy gold gravity casting production are:

1.The surface finish of Henan Dashan non-ferrous metal of the product is not high, and it is easy to produce pits after shot blasting.

2.Aluminum castings have few internal holes and can be heat treated.

3.The product has low density and poor strength, but high elongation.

4.The mold cost is low and the mold service life is long.

5.The production efficiency is low, which increases the production cost.

6. The process is relatively simple, not suitable for the production of thin-walled parts.

The production of aluminum-gold sand casting is the use of sand to make molds for non-ferrous metals in Dashan, Henan. Sand casting production entails putting the finished part model or wooden model (model) into the sand, then filling the mold with the model, and then disassembling the model to form the mold. In order to remove the mold before casting the production metal, the mold should be divided into two or more parts; In the mold manufacturing process, the holes and vents of the metal must be cast into the mold, i.e., the synthetic casting system.

Cast gold is liquid and held for a proper amount of time until the gold solidifies. After the parts are removed, the molds are destroyed, so a new mold must be made for each casting.

Casting production refers to the process in which one of these substances is liquid at room temperature but cures to solidify and form immediately after being injected into a mold of a specific shape. Most of the materials to be cast for production are metals (such as copper, iron, aluminum, tin, lead, etc.), which are initially solid, but after heating to a liquid state, the material of the mold can be 020

2. Gold and even ceramics. The method used will vary according to the requirements. The products produced in this non-ferrous metal method of Henan Dashan are called castings.