What is the difference between die casting and casting, and what is the difference between casting a

1. The definitions of die casting and casting are different:

Die casting, a metal casting process.

It is characterized by the use of a mold cavity to apply high pressure to the molten metal, and the mold is usually machined from a stronger alloy, a process somewhat similar to injection molding.

Casting, a method of pouring 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 a part or blank.

2. The process of die casting and casting is different:

The essence of pressure casting (abbreviated as die casting) is to make liquid or semi-liquid metal under high pressure.

A method of filling the cavity of a die-casting mold at a high speed and forming and solidifying under pressure to obtain a casting.

The casting process can be divided into three basic parts, namely casting metal preparation, casting preparation and casting processing, casting metal refers to the metal material used for pouring castings in casting production, which is made in the form of a metal element.

It is the main component and the alloy composed of other metal or non-metallic elements is customarily called cast alloy, mainly cast iron and cast steel.

and cast non-ferrous alloys.

3. The casting accuracy of die casting and casting is different.

Die casting is a precision casting method that allows the dimensional tolerances of die castings made by die casting.

Very small, very high surface accuracy, in most cases, die castings can be assembled without further turning, and threaded parts can be cast directly.

Casting, smelting metal, manufacturing a casting mold, and pouring the molten metal into the casting mold, after solidification, obtain a metal part blank with a certain shape, size and performance.

1. The type is different.

Cast iron: is an alloy material composed of iron, carbon, and silicon.

Die casting: Die casting is a metal casting process that is characterized by the use of a mold cavity to apply high pressure to the melted metal.

2. The materials used are different.

Cast Iron: Only the cast iron itself is made of material.

Die casting: There are many materials such as zinc, copper, aluminum, magnesium, lead, tin, and lead-tin alloys and their alloys.

Die casting process. The traditional die casting process consists of four main steps, or high-pressure die casting. These four steps, including mold preparation, filling, injection, and shakeout, are also the basis for various modified die casting processes.

During the preparation process, the mold cavity needs to be sprayed with lubricant, which can help to control the temperature of the mold and also help the casting to be released.

The mold can then be closed and the molten metal can be injected into the mold at high pressure, which ranges from about 10 to 175 megapascals. When the molten metal is filled, the pressure is maintained until the casting is solidified.

The actuator then pushes out all the castings, and since there may be multiple cavities in one mold, multiple castings may be produced in each casting process. The process of sand removal involves separating the residue, including the mold opening, runner, gate and flash.

This process is usually done by extruding the casting with a special dressing die. Other methods of shakeout include sawing and grinding. If the gate is more fragile, you can directly hit the casting, which can save manpower.

Excess mold openings can be reused after melting. The usual yield is about 67%.

The high-pressure injection results in a very fast filling of the mold, so that the molten metal can fill the entire mold before any part of it solidifies. In this way, surface discontinuities can be avoided even in thin-walled parts that are difficult to fill. However, this also leads to air entrapment, as it is difficult for air to escape when filling the mold quickly.

This problem can be reduced by placing exhaust vents on the parting line, but even the most delicate processes can leave air holes in the center of the casting. Most die castings can be done through secondary processing to complete some structures that cannot be done by casting, such as drilling, polishing.

After the sand removal is complete, it is time to check for defects, the most common of which include stagnation (insufficient pouring) and cold scarring. These defects can be caused by insufficient temperature of the mold or molten metal, impurities in the metal, too few vents, too much lubricant, etc.

Other defects include porosity, craters, thermal cracking, and flow marks. Flow marks are traces left on the surface of a casting by gate defects, sharp corners, or excessive lubricant.

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 cast materials are metals that were originally solid but heated to a liquid state (ferrous metals such as iron, steel, stainless steel, alloy steel, etc.); Non-ferrous metals such as copper, aluminum, tin, lead, zinc, magnesium, titanium, etc.). From the process method, it is divided into sand casting, metal gravity casting, ceramic or gypsum gravity casting, shell casting, lost foam casting, special casting, etc., and there are also process methods other than sand casting are collectively referred to as special casting processes.

Pressure casting, referred to as die casting, is a molding method in which liquid or semi-liquid metal or alloy is poured into the press chamber of the die-casting machine, so that it fills the cavity under high pressure and high speed, and forms and crystallizes under high pressure to obtain castings. Die-casting is one of the special casting process methods in the casting process.

Casting can be divided into gravity casting and pressure casting according to the pouring process of molten metal. Gravity casting refers to the process of injecting molten metal into the mold under the action of the earth's gravity, also known as casting. Gravity casting in a broad sense includes sand mold casting, metal mold casting, investment casting, lost foam casting, mud mold casting, etc.; Gravity casting in the narrow sense refers specifically to metal mold casting.

Pressure casting refers to the process of injecting molten metal into a mold under the action of other external forces (excluding gravity). Pressure casting in a broad sense includes pressure casting and vacuum casting of die-casting machines, low-pressure casting, centrifugal casting, etc.; Pressure casting in the narrow sense refers to the metal type pressure casting of the die-casting machine, referred to as die-casting. Precision casting factory has been engaged in gravity casting of sand molds and metal molds for a long time.

These casting processes are the most commonly used and relatively low in non-ferrous metal casting.

Die casting is the metal mold pressure casting carried out on the die casting machine, which is the casting process with the highest production efficiency at present. Die-casting machines are divided into two categories: hot chamber die-casting machines and cold-chamber die-casting machines. The hot chamber die-casting machine has a high degree of automation, less material loss, and higher production efficiency than the cold-chamber die-casting machine, but due to the restriction of the heat resistance of the parts, it can only be used for the production of castings with low melting point materials such as zinc alloy and magnesium alloy.

Aluminum alloy die castings, which are widely used today, can only be produced on cold chamber die casting machines due to their high melting points.

The main feature of die casting is that the molten metal fills the cavity under high pressure and high speed, and is formed and solidified under high pressure, and the shortcomings of die casting are: because the molten metal fills the cavity under high pressure and high speed, the air in the cavity is inevitably wrapped inside the casting and forms subcutaneous pores, so the aluminum alloy die casting is not suitable for heat treatment, and the zinc alloy die casting is not suitable for surface spraying (but can be painted). Otherwise, when the internal pores of the casting are heated by the above treatment, they will expand when heated, resulting in deformation or bubbling of the casting.

In addition, the mechanical cutting allowance of die casting should also be obtained smaller, generally around, both can reduce the weight of casting, reduce the amount of cutting to reduce costs, and can avoid penetrating the dense layer of the surface, expose the subcutaneous pores, cause the workpiece to be scrapped.

The difference between die casting and casting is that Henan Dashan non-ferrous metal die casting and copper casting are two different processing technologies. Casting: Molten liquid metal fills the cavity for cooling.

It is easy to form pores in the middle of the workpiece. Forging: Mainly formed by high-temperature extrusion.

The grains in the part can be refined. Forging: The hammering method is used to make a metal material in a plastic state into a workpiece with a certain shape and size.

The forging is extruded through the die, which has high efficiency, and the forging has the effect of refining the metal grains, and the strength is higher than that of the casting. However, molds are expensive to manufacture, so forging is only suitable for mass production.

The casting cost is low, and it is suitable for the basic molding of large parts and the production of single pieces. For example, the pedestal of a large machine, etc., can only be forged by casting rather than by mold.

The production and processing methods are different, so the characteristics of use are completely different. The flange is made by pouring molten aluminum into a sand mold, and after it has been cooled and shaped, it is machined (deburring, trimming, polishing). Forging, a steel die is used, and in it a heat-softened aluminum block is placed, which is formed by pressing and cooled.

Casting: The process of smelting metal into a liquid that meets certain requirements, then pouring it into a mold, cooling, curing and cleaning to obtain a casting (part or blank) with a predetermined shape, size and properties. The basic process of modern machinery manufacturing.

Die casting: This is a processing method that uses a forging machine to apply pressure to the metal blank to plastically deform it to obtain forgings with certain mechanical properties, certain shapes and sizes of non-ferrous metals in Henan Dashan.

Sand casting is the most traditional casting method, where sand is used to make cavities and pour them to obtain castings.

However, the pressure of molten metal in sand casting is often insufficient, resulting in the formation of defects such as insufficient filling and cold separation;

As a result, a new casting method was born: pressure casting, that is, die casting.

Artificial pressure is provided to strengthen the fluidity and filling capacity of the molten metal, resulting in better quality castings.

It is a casting method in which molten gold is poured into the pressure chamber, the cavity of the steel mold is filled at high speed, and the molten alloy is solidified under pressure to form a casting. The main feature that distinguishes die casting from other casting methods is high pressure and high speed.

Forging: Generally it is the deformation of metal materials in a solid state at high temperature to achieve the shape you want;

Casting: After the metal material is melted, the liquid is poured into the cavity to get the shape you want;

Die-casting: Hydraulic metal is quickly injected into the mold through the die-casting machine to obtain the corresponding casting, which is generally only used for non-ferrous alloys (mainly aluminum and zinc alloys, and copper alloys are also available).

The strength first depends on the material, and then the process, and the forging material has the best internal fiber structure and the best comprehensive strength. Die casting is only a kind of casting, because the general die casting can not be heat treated, so the strength is lower than the same kind of casting after heat treatment. However, the strength before heat treatment is higher than that of castings without heat treatment.

The liquid metal of atmospheric pressure casting is forced into the cavity by its own gravity, and the liquid metal of die casting is pressed into the cavity by a certain pressure. The latter has been greatly improved in reducing the shrinkage deformation of castings, reducing shrinkage porosity and porosity, improving the compactness of castings, and improving production efficiency.

Stamping: It is a process of punching out parts with a punch to punch out iron sheets, stainless steel iron sheets or copper sheets.

Die-casting: It is a process of melting aluminum, copper and other alloys into a liquid state, and then scooping the molten alloy into a die-casting machine with a spoon, and using a die-casting mold to make parts.

The introduction is as follows: 1. Die-casting is a metal casting process, which is characterized by the use of the inner cavity of the mold to apply high pressure to the molten metal. Molds are usually machined from a stronger alloy, a process somewhat similar to injection molding.

Most die castings are iron-free, such as zinc, copper, aluminum, magnesium, lead, tin, and lead-tin alloys and their alloys.

2. Stamping is a forming processing method that relies on presses and dies to apply external force to plates, strips, pipes and profiles, etc., so that they produce plastic deformation or separation, so as to obtain the required shape and size of the workpiece (stamping parts). Stamping and forging belong to plastic processing (or pressure processing), which is collectively called forging.

The difference between stamping dies and die-casting dies:

1. The forming method is different, the stamping die generally belongs to shear molding, and the press is used to press and shear the raw materials. Die-casting molds are forming molds that use liquid metal to fill the mold cavity and slowly apply pressure during the cooling process to form them.

2. The operating objects are different, the stamping mold is solid metal, and the die-casting mold is liquid metal.

3. The specifications of the operating objects are different, and the size of the product parts formed by the stamping die is generally small, while the use of the die-casting mold can produce larger product parts.

4. The production cost is different, and the products produced by die-casting molds need additional processing, such as polishing and chrome plating. Therefore, the production cost is about 30% higher than the cost of stamping die stamping products. <

1. The definitions of die casting and casting are different:

Die casting, a metal casting process, is characterized by the use of a mold cavity to apply high pressure to the melted metal, the mold is usually machined with a stronger alloy, this process is somewhat similar to injection molding; Casting, a method of pouring 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 a part or blank.

2. The process of die casting and casting is different:

The essence of pressure casting (referred to as die casting) is to make liquid or semi-liquid metal fill the cavity of the die-casting mold at a high speed under high pressure, and form and solidify under pressure to obtain castings.

The casting process can be divided into three basic parts, namely casting metal preparation, casting preparation and casting processing, casting metal refers to the metal material used for pouring castings in the casting production, it is an alloy composed of a metal element as the main component, and adding other metal or non-metallic elements, it is customary to call casting alloy, mainly cast iron, cast steel and cast non-ferrous alloys.

3. The casting accuracy of die casting and casting is different.

Die casting is a precision casting method, the dimensional tolerance of the die casting made by die casting is very small, the surface accuracy is very high, in most cases, the die casting can be assembled and applied without turning, and the threaded parts can also be directly cast.

Casting, smelting metal, manufacturing molds, and pouring molten metal into the mold, solidifying to obtain a metal part blank with a smooth shape, size and performance.

Related information: pressure casting is referred to as die casting, cavity is a kind of molten gold liquid poured into the pressure chamber, with high speed to fill the cavity of the steel mold, and make the alloy liquid solidify under pressure to form a casting method, die casting is different from other casting methods The main characteristics are high pressure and high speed.

1. The molten metal fills the cavity under pressure, and crystallizes and solidifies under higher pressure, and the common pressure is 15-100MPa.

2. The molten metal fills the cavity at high speed, usually in 10-50 meters per second, and some can exceed 80 meters per second, (the linear velocity of the cavity introduced through the inner gate - the velocity of the inner gate), so the filling time of the molten metal is very short, and the cavity can be filled within about seconds (depending on the size of the casting). <>