Which is better, resin sand casting and peritoneal sand casting, which is lower cost

The coated sand process is mature and the production cost is low.

Coated sand: advantage 1, vibration sand cleaning, high strength, low gassing, low expansion;

2. Good dispersion and high surface finish of castings;

3. The shell type does not have layers, good thermal stability, good thermal conductivity and good fluidity;

4、.The shell type does not have a layer,Good thermal stabilityThe surface of the casting is flat and has good thermal conductivity;

5. High strength, high temperature resistance, low expansion,Good mold release and good sand resistance;

6. The shell layer is uniform and does not peel off, and the curing speed is fast.

Coated sand recycling has always been the subject of concern of the majority of experts, the current coated sand recycling equipment is expensive and the regeneration efficiency is not high, the production efficiency of 5 tons of thermal regeneration equipment is 12 million to 16 million yuan, the cost of regeneration coated sand is 65-90 yuan tons, such a high cost can not be generally accepted by domestic foundry enterprises.

The resin used in resin sand is more expensive, generally about 10,000 yuan t, so it has a greater impact on the casting cost, the production equipment of the manufacturer is uneven, and the quality and stability of the resin produced need to be strictly controlled.

Other raw materials of resin sand include curing agent, coating, binder, release agent, sealing mud strip, etc., the impact of these raw materials on the quality of castings is not the main one, but the impact on the cost of resin sand casting can not be ignored, such as the difference in the amount of curing agent, which not only affects the production efficiency of the molding process and affects the production cost, but also affects the material cost. Therefore, the selection principle of other raw materials of resin sand is to consider not only its quality, but also its matching with the main materials, such as procurement, transportation and other issues.

Coated sand is good! The cost is also low! However, the investment is large, the power consumption is high, and the technical requirements are high!

Of course, the cost of coated sand molding is the lowest, and the process is simple.

The main advantages of coated sand 1, vibration sand cleaning, high strength, low gassing, low expansion; 2. Good dispersion and high surface finish of castings; 3. The shell type does not have layers, good thermal stability, good thermal conductivity and good fluidity; 4、.The shell type does not have a layer,Good thermal stability

The surface of the casting is flat and has good thermal conductivity; 5. High strength, high temperature resistance, low expansion,Good mold release and good sand resistance; 6. The shell layer is uniform and does not peel off, the curing speed is fast, and there are many advantages, so I still choose this, the product quality produced by a little more must be high, you can refer to the international casting industry network.

Coated sand. The surface of the sand is coated with a layer of solid resin film before molding. There are two kinds of lamination processes: cold and hot

The resin is dissolved by cold method, and urotropine is added in the sand mixing process to coat the surface of the sand particles to obtain coated sand; The thermal method preheats the sand to the temperature, adds resin to melt it, stirs to coat the resin on the surface of the sand particles, adds urotropine aqueous solution and lubricant, cools, crushes and sieves to obtain coated sand. It is used for steel castings and iron castings.

The coated sand is mainly made of quartz sand as the raw sand, thermoplastic phenolic resin, urotropine and reinforcing agent as raw materials. According to the different needs of users, the ratio is appropriately adjusted in terms of curing speed, defilmatization, fluidity, collapse, surface finish of castings, storage, etc. It is one of the modeling materials for automobiles, tractors, hydraulic parts and so on.

Resin sand refers to molding sand or core sand that uses synthetic resin as the binder of sand particles. After the mold or core is made from resin sand, the resin undergoes an irreversible cross-linking reaction and solidifies through the action of a solidifying (hardening) agent, thereby giving strength to the mold or core.

Resin sand is used as mould (core) sand in modern foundry production. The molding (core) sand with resin as the binder mainly includes thermal coated resin sand, hot core box resin sand, cold core box resin sand, furan resin sand, i furan resin self-hardening sand, etc. Resin sand has high strength after hardening, which is suitable for machine modeling and can produce complex, thin-walled castings.

The disadvantage of resin sand is that the binder is expensive and polluting to the air. In order to save the amount of resin, the raw sand of pure round sand grains that has been washed or scrubbed is generally used.

Hefei Quansheng Machinery Manufacturing Co., Ltd. is mainly engaged in the production of castings and supporting processing products. At present, it has 5 lost foam production lines, with an annual output of 7,000 tons of steel castings and 5,000 tons of iron castings. Since 2000, the technical team has been engaged in casting process technology and production, and has a very professional technical force for some difficult and miscellaneous parts, complex structural parts, small batches, or new product development and trial production.

From the perspective of casting and processing technology, we can provide customers with suggestions for better product structure and performance. We can give customers satisfactory answers to all kinds of questions raised by customers in a timely manner. Our production capacity is also relatively high, you can search for our manufacturers on the Internet ** to ask, you can also get ** for free. (Look).

Resin sand raw sand is divided into ordinary resin sand, washed resin sand, scrubbed resin sand and other categories, because the mud content in the scrubbing sand is very small, so it can greatly reduce the waste of resin sand, should be preferred. Secondly, wash resin sand is selected, but untreated raw sand must not be used. When choosing tree sand, we must follow the principle of nearby selection, so that on the one hand, it can reduce expensive freight, and on the other hand, it can ensure the best resin sand and does not affect production.

Second, we should try to choose raw sand with low angular coefficient. At the same time, due to the different technical level and equipment level of each scrubbing sand production enterprise, the quality of the scrubbing sand produced by them is also different, therefore, if there are conditions, when determining the use of resin sand, the scrubbing sand production enterprise should be inspected, and its technical status, equipment status and sand source status should be investigated, and the sand quality control results of the other party should be found. In short, in the process of selecting resin sand raw sand, it is best to minimize the production cost of resin sand by means of test and comparison, with reference to other aspects, under the premise of ensuring production and quality.

The surface of the coated sand is coated with a layer of solid resin film before modeling. There are two kinds of laminating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine in the sand mixing process to coat the surface of the sand particles, and the ethanol volatilizes to obtain coated sand; The thermal method preheats the sand to a certain temperature, adds resin to melt it, stirs to coat the resin on the surface of the sand particles, adds urotropine aqueous solution and lubricant, cools, crushes and sieves to obtain coated sand.

It is used for steel castings and iron castings.

Resin sand is not coated sand. The difference between the two is: resin sand is self-hardening sand, cold hardening, hardened with a curing agent; Whereas, coated sand is thermoset and hardened by heating. The common denominator is the use of different types of resins as binders and different curing agents to catalyze the bonding.

Coated sand has mature technology and low production costCoated sand: advantages: vibration sand cleaning, high strength, low gassing, low expansion; Good dispersion and high surface finish of castings; The shell type does not have layers, good thermal stability, good thermal conductivity and good fluidity; The shell type does not have a layer,

Good thermal stabilityThe surface of the casting is flat and has good thermal conductivity; High strength, high temperature resistance, low expansion,Good mold release and good sand resistance; The shell is uniform and does not peel, and the curing speed is fast The recycling of coated sand has always been a topic of concern for the majority of experts, the current coated sand recycling equipment is expensive and the regeneration efficiency is not high, the production efficiency is 5 tons of thermal regeneration equipment in 12 million to 16 million yuan, and the cost of recycled coated sand is 65-90 yuan tons, so high cost can not be generally accepted by domestic foundry enterprises.

The molding sand and core sand that have been coated with a layer of solid resin film on the surface of the sand particles before modeling and core making are called coated sand, also known as shell (core) sand. It is the first thermosetting resin sand, and its process is to mechanically mix powdered thermosetting phenolic resin with raw sand and cure it when heated. Now it has been developed into a membrane sand prepared with thermoplastic phenolic resin plus latent curing agent (such as urotropine) and lubricant (such as calcium stearate) through a certain coating process, and the resin covering the surface of the sand particles is melted when the coated sand is heated, and under the action of the methylene decomposition of urotropine, the molten resin is rapidly transformed from a linear structure to a non-melt body structure, so that the coated sand is cured and formed.

Under the action of the methylene group decomposed by methion, the box is closed and cast. The process is to mechanically mix powdered thermosetting phenolic resin with raw sand. Resin sand casting is to put the original sand and resin, so that the coated sand is solidified and molded in the modeling, the resin of the coated sand is coated on the surface of the sand particles when heated, and the resin is melted on the surface of the sand particles before the core is made, and the molding sand has been coated with a layer of solid resin film on the surface of the sand before the core is made, invented by Dr. Cronin (Croning) of Germany in 1944, the curing agent is mixed evenly and put into the sand box, and the heating is cured.

The new casting coating is improved and adjusted on the basis of the traditional casting coating, which can effectively prevent the oxidation of high-temperature liquid metal, and does not have a chemical reaction during contact with the mold and high-temperature liquid metal. And it can absorb and digest nitrogen, sulfur, carbon and other gases.

The difference between sodium silicate sand, resin sand and coated sand: mainly due to the different binders and curing agents used, so their production processes are different.

Water glass sand: water glass as a binder and quartz sand mixed into molding sand in a certain proportion, after the mold is made, carbon dioxide is blown to solidify, and then the mold is started, the box is closed, and the casting is poured.

Resin sand: Resin is used as a binder (reinforcing agent is required) and quartz sand are mixed into molding sand in a certain proportion, which is naturally cured at room temperature after the mold is made, and then molded, closed and poured into castings.

Coated sand: After heating the quartz sand, put it into the sand mixer, add resin, curing agent and anti-caking agent to make the surface of the quartz sand covered with a layer of resin film, and release it for cooling and crushing after mixing evenly. Heat curing is required for use.

Coated sand has mature technology and low production costCoated sand: advantages: vibration sand cleaning, high strength, low gassing, low expansion; Good dispersion, high surface smoothness of castings; The shell type does not have layers, good thermal stability, good thermal conductivity and good fluidity; The shell type does not have a layer,

Good thermal stabilityThe surface of the casting is flat and has good thermal conductivity; High strength, high temperature resistance, low expansion,Good mold release and good sand resistance; The shell is uniform and does not peel, the curing speed is fast The recycling of coated sand has always been the subject of concern of the majority of experts, the current coated sand regeneration equipment is expensive and the regeneration efficiency is not high, the production efficiency of 5 tons of thermal regeneration equipment is 12 million to 16 million yuan, the cost of recycled coated sand is 65-90 yuan tons, so the high cost of Kaizhou Qiao is not generally accepted by domestic foundry enterprises.