Question 2: What's the difference between forging and casting? Casting: that is, changing an unformed molten metal into an unformed solid.
Forging: it is to change a solid in one shape into another.
An image point of view:
Casting is like playing with wax. You buy wax (scrap steel or pig iron) and turn it into liquid and put it in the mold, so you can get different shapes (solid-liquid-solid).
Forging is like making bread. You knead it into small dough and put it into a mold to make products of different shapes. Almost a solid can change into other shapes (solid to solid) at high temperature.
The so-called casting is the process of casting molten metal into a mold to obtain a casting. Foundry majors mainly study the metal melting process and process control in the casting process.
Forging is a solid plastic forming, which is divided into hot working and cold working, such as extrusion, drawing, upsetting and stamping.
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Question 3: What's the difference between casting and forging? The difference is:
First, casting.
1. Casting is the process of melting metal into liquid meeting certain requirements, pouring it into a mold, cooling, solidifying and cleaning to obtain castings (parts or blanks) with predetermined shapes, sizes and properties. Basic technology of modern machinery manufacturing industry.
2. The cost of blank produced by casting is low. "It shows its economy, and its adaptability is very wide."
3. However, there are many materials (such as metal, wood, fuel, molding materials, etc. ) and equipment (such as metallurgical furnace, sand mixer, molding machine, core making machine, sanding machine, shot blasting machine, cast iron flat plate, etc.). ) required by casting production, causing dust, harmful gases and noise to pollute the environment.
4. Casting is an early metal hot working process with a history of more than 6000 years. 3200 BC: Lang Dahuai is a frog cast with shallow squid seeds. From BC 13 to BC 10 century, bronze casting was in its heyday. Zhang Xian's mace in flood season is 875 kilograms heavier than sandalwood, Fang Ding in Simuwu, Zunpan in Ceng Houyi in Warring States and transparent mirror in Western Han Dynasty are all representative products of ancient casting. Early casting was greatly influenced by pottery. Most of them are tools or appliances for agricultural production, religion and life. In 5 13 BC, the earliest recorded cast iron DD tripod (about 270 kg) in Jin State was cast. Iron castings were produced around the 8th century. /kloc-after the industrial revolution in the 0/8th century, it entered a new era of serving big industries. In the 20th century, this development
5. There are many kinds of casting, including wet sand mold, dry sand mold and chemically hardened sand mold. ② Special casting includes two types: special casting with natural ore as the main molding material (such as investment casting, clay casting, shell casting in casting workshop, negative pressure casting, full mold casting, ceramic mold casting, etc.). ) and special casting with metal as the main mold material (such as metal mold casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc. ).
6. The casting process usually includes preparation (making liquid metal into a container for solid casting). According to the materials used, the preparation can be divided into sand mold, metal mold, ceramic mold, clay mold, graphite mold and so on. "Word preparation can be divided into disposable type, semi-permanent type and permanent type. The quality of preparation is the main factor affecting the quality of castings. "
Second, forging
1. Forging is a processing method of applying pressure to metal blank by forging press to make it produce plastic deformation, so as to obtain forgings with certain mechanical properties, shapes and sizes.
2. One of the two elements of forging. As-cast metal porosity can be eliminated by forging, and the mechanical properties of negative gorge pyramid rafters are generally better than those of the same material castings. Important parts with high load and bad working conditions in machinery] Plates and profiles with simple shape and rollability ... >; & gt
Question 4: Is the forging good or casting good? When forging, metal undergoes plastic deformation, which has the function of continuously refining grains and cutting off fibers, so it is often used to manufacture furs of important parts, such as shafts and teeth. Casting requires processing materials. Generally, cast iron and aluminum have better casting properties. Casting does not have many advantages of forging, but it can make parts with complex shapes, so it is often used to make supporting parts with low mechanical properties. Such as machine tool housings, etc. Forging: by hammering, etc. Metal materials in plastic state are made into workpieces with certain shapes and sizes, and their physical properties are changed. Casting: metal is heated and melted, then poured into sand mold or casting mold, cooled and solidified into objects. Forging is to mechanically make metal into the shape you want (there are two methods: cold and hot). ) casting: after melting the metal, pour it into the finished sand mold or mold, and then cool it and solidify it into the shape you want. Forging: a processing method of applying pressure to a metal blank by a forging press to produce plastic deformation, so as to obtain forgings with certain mechanical properties, shapes and sizes. One of the two major elements of forging. Forging can eliminate the as-cast porosity and welding holes of metal, and the mechanical properties of forgings are generally better than those of castings of the same material. Forgings are mostly used for important parts with high load and bad working conditions in machinery, except for rolled plates, profiles or weldments with simple shapes. Forging can be divided into: ① free forging (free forging). The metal is deformed between the upper and lower supports (anvil) by impact or pressure to obtain the required forgings. There are two main methods: manual forging and mechanical forging. ② Closed forging. Forgings are obtained by pressure deformation of metal blanks in a forging die chamber with a certain shape, which can be divided into die forging, cold heading, rotary forging, extrusion and so on. According to the deformation temperature, forging can be divided into hot forging (the processing temperature is higher than the recrystallization temperature of the blank metal), warm forging (lower than the recrystallization temperature) and cold forging (normal temperature). Forging materials are mainly carbon steel and alloy steel with various compositions, followed by aluminum, magnesium, titanium, copper and their alloys. The original state of materials includes rod, ingot, metal powder and liquid metal. The ratio of the cross-sectional area of a metal before deformation to the broken die area after deformation is called forging ratio. The correct selection of forging ratio has a great relationship with improving product quality and reducing cost. Casting: the processing method of melting metal into liquid, pouring it into a mold, cooling, solidifying and cleaning to obtain castings with required shapes. Can be made into various objects with complex shapes. The forged workpiece has fine texture and good toughness, just like a woman; The shape and size of the casting are accurate, and the machining capacity is small, but it is black. Castings are cast with molds, forgings are formed by large forging, and stamping parts are formed by large stamping with molds at one time.
Question 5: The difference between forging and casting is far from perfect.
Forging is to deform the blank by external force.
Casting is to melt and fill the cavity with metal, and get the blank of the part after cooling.
Question 6: At present, college students can learn casting or forging, which has a good prospect. Both industries can! Now the competition in the casting and forging industry is much less than that in other industries. I think casting and forging are just different modes of production. See which one you like, they are sometimes inseparable. For example, the valve body is cast and the handle is forged. Want to make money or start your own business ~ ~
Question 7: What's the difference between forging and casting? Which is better, forging or casting? Far from it.
Forging is to deform the blank by external force.
Casting is to melt and fill the cavity with metal, and get the blank of the part after cooling.
Question 8: What's the difference between forged parts and cast parts? Forging is a part that is forged by using air hammer or press to make metal in red-hot state. Casting is a part produced after being metallized into a liquid state, poured into a cavity with a specific shape and cooled and solidified. To put it bluntly, forging is to bake and knead the metal, while casting is to metallize it into thin soup and then cool and solidify it.
Forgings have high cost and long production cycle. The processing of forgings can ensure the continuity of metal fiber structure, keep the fiber structure of forgings consistent with the shape of forgings, complete metal streamline, dense structure and good mechanical properties. It can ensure that the object has good mechanical properties and long service life, and the processed object is durable, high in strength and first-class in texture.
The casting cost is low and the production cycle is short. Because it is molten iron, it has good fluidity and can form complex shapes. However, due to the possible defects such as sand holes, air holes and shrinkage cavities, the quality is unstable, and many defects are prone to occur, and the mechanical properties are not as good as those of forgings, which affects the service life.
Question 9: Which is better, casting, forging or welding? Each has its own characteristics. High casting hardness, small deformation, high forging strength, strong plasticity, weldability and easy cracking during welding.
Question 10: What's the difference between casting and forging? The difference is:
First, casting.
1. Casting is the process of melting metal into liquid meeting certain requirements, pouring it into a mold, cooling, solidifying and cleaning to obtain castings (parts or blanks) with predetermined shapes, sizes and properties. Basic technology of modern machinery manufacturing industry.
2. The cost of blank produced by casting is low. "It shows its economy, and its adaptability is very wide."
3. However, there are many materials (such as metal, wood, fuel, molding materials, etc. ) and equipment (such as metallurgical furnace, sand mixer, molding machine, core making machine, sanding machine, shot blasting machine, cast iron flat plate, etc.). ) required by casting production, causing dust, harmful gases and noise to pollute the environment.
4. Casting is an early metal hot working process with a history of more than 6000 years. 3200 BC: Lang Dahuai is a frog cast with shallow squid seeds. From BC 13 to BC 10 century, bronze casting was in its heyday. Zhang Xian's mace in flood season is 875 kilograms heavier than sandalwood, Fang Ding in Simuwu, Zunpan in Ceng Houyi in Warring States and transparent mirror in Western Han Dynasty are all representative products of ancient casting. Early casting was greatly influenced by pottery. Most of them are tools or appliances for agricultural production, religion and life. In 5 13 BC, the earliest recorded cast iron DD tripod (about 270 kg) in Jin State was cast. Iron castings were produced around the 8th century. /kloc-after the industrial revolution in the 0/8th century, it entered a new era of serving big industries. In the 20th century, this development
5. There are many kinds of casting, including wet sand mold, dry sand mold and chemically hardened sand mold. ② Special casting includes two types: special casting with natural ore as the main molding material (such as investment casting, clay casting, shell casting in casting workshop, negative pressure casting, full mold casting, ceramic mold casting, etc.). ) and special casting with metal as the main mold material (such as metal mold casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc. ).
6. The casting process usually includes preparation (making liquid metal into a container for solid casting). According to the materials used, the preparation can be divided into sand mold, metal mold, ceramic mold, clay mold, graphite mold and so on. "Word preparation can be divided into disposable type, semi-permanent type and permanent type. The quality of preparation is the main factor affecting the quality of castings. "
Second, forging
1. Forging is a processing method of applying pressure to metal blank by forging press to make it produce plastic deformation, so as to obtain forgings with certain mechanical properties, shapes and sizes.
2. One of the two elements of forging. As-cast metal porosity can be eliminated by forging, and the mechanical properties of negative gorge pyramid rafters are generally better than those of the same material castings. Important parts with high load and bad working conditions in machinery] Plates and profiles with simple shape and rollability ... >; & gt