Copper Coupling Factory: Recent Episodes

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A number of suitable technologies suitable for China's national conditions are constantly emerging. (2) The performance of the vibrating table should meet the requirements of dry sand vibrating filling the complex inner cavity of the white mold, and the white mold should keep the size and shape stable. However, in general, the lost foam casting technology has a continuous period of development, this period of development will increase the speed, and will achieve a qualitative leap and quantitative expansion. mainly produces Langyashan brand casting filters, molten steel filters, molten iron filters, copper filters, aluminum filters, silicon carbide ceramics Filter, zirconia ceramic filter, alumina ceramic filter Film, aluminum alloy filter, casting filter production equipment, etc. It is necessary to analyze whether the casting products produced are suitable for the lost foam casting process. Therefore, many companies do not hesitate to launch without any pre-research, research, and experiment, and when a large number of waste products are in front of them, their enthusiasm and expectations are wiped out by the cold water, and they will disappear. Quite a few of them have done a lot of preliminary work, such as finding suitable castings, conducting preliminary tests, and investing in large-scale production lines after trial production in small batches.com.

At present, countries such as the United States, Germany, Japan and other countries in the power of lost foam casting have matured the lost foam casting process in many fields such as automobiles, construction machinery, machine tools, and ships. (3) The cooling methods of dry sand and old sand, including processing temperature and processing flow rate, should meet the requirement that the white mold is not deformed by heat. The so-called quality refers to the gradual increase of high-end casting production enterprises, and the production of complex shaped castings has gradually made breakthroughs; while the quantity refers to that a considerable number of enterprises will also use the lost foam casting process. What impact will the small and medium-sized traditional sand casting companies bring? From the perspective of development trends, will it replace traditional foundry enterprises? Teacher Guo Peng of the National Institute of Lost Foam and V Method Casting said that although the lost foam process can be launched with very little money, the cost of wood molds is eliminated, the dependence of sand casting on skilled casting workers is reduced, and the labor intensity of workers is reduced. However, for large casting companies, the lost foam casting process does not bring much impact.

After a certain period of practice, continuous exploration and improvement, we can gradually and flexibly apply the lost foam casting process. (6) Due to negative pressure pouring and solidification, the density of castings increases. So he was happy, and when he saw people, he said that lost foam casting was easy. Li Zengmin emphasized: "It is worth noting that the lost foam process is not a versatile process. It filters and purifies all kinds of metal melts, effectively removing air bubbles, ash oxides and various debris and other harmful impurities in the metal melt, thereby fundamentally eliminating the castings. Match specific process parameters and requirements. (7) Due to the negative pressure of the sand box during pouring, the white mold gasification gas is easily extracted, processed and discharged, and the internal environment of the workshop is good. (6) The white mold requires high precision, high hardness, good wear resistance and high stability (it is recommended to use the whole white mold as much as possible and reduce the number of mold pieces and bonding gaps).

Because the production efficiency and production rhythm of lost foam casting are far behind the advanced automated vertical molding line or static pressure molding line, and large casting enterprises often produce certain or certain types of shaped products, and also have the strength to purchase automated molding lines. Therefore, to master and use the lost foam casting process, it is necessary to implement "private customization" based on the characteristics of the enterprise itself. Because there are still many problems in the theory and practice of lost foam casting technology that have not been completely resolved. Complete sets of equipment or production lines on equipment manufacturing enterprises. Such as: the flow of the molten iron is turbulent, which is likely to cause slag inclusion and gas entrapment; a flame retardant is added to the raw materials of white molds in China, which will increase the amount of slag; using a negative pressure solid type, the negative pressure makes the molten iron flow more Disturbance, and cause the wall effect to prevent the slag gas from being discharged; during the pouring process, the white mold absorbs heat and the temperature difference between the front and back of the molten iron increases, and the low-temperature molten iron at the front causes poor white mold gasification, resulting in carbon deposition;

A large amount of gas can only be discharged through the narrow paint gap, so it has a great dependence on the quality of the paint; the use of dry sand modeling, dry sand thermal conductivity is lower than wet sand, it is easy to cause casting hardness reduction; white mold gasification produces toxic gas pollution Air; when producing aluminum castings, the lower pouring temperature makes the white mold poorly vaporized, and the liquefied white mold contaminates the dry sand, resulting in reduced air permeability and increased chance of porosity in the casting; due to the low strength of the white mold, it is not deformed. "Baoding Daqian Equipment Technology Co. (5) The thickness of the applied paint must be uniform, so the paint must have good coatability, leveling, breathability, normal temperature and high temperature strength, collapsibility, etc. Then I found an iron box, buried the white mold in the sand, and left the filling channel, Pour molten iron into it; cool it down, lift the gate, and a string of castings will appear in front of you.

Looking at the appearance of the casting, it is indeed sharp and beautiful." Li Zengmin went on to say, "However, the output value of well-done enterprises has doubled several times and they have indeed seen results. Practically speaking, most of these enterprises are calmer than before. The rules are more complicated., product quality is reliable, reputation is guaranteed, look forward to working with you! Langyashan brand cast filter, high temperature environmental protection casting protector. In fact, every casting process is impossible to deal with the world and cure all diseases. For the lost foam process, do n’t listen to it and put it in a hurry. To launch the lost foam process, we must comprehensively weigh and repeatedly verify the emergence of the lost foam casting process. As far as China ’s current technological level is concerned, according to its basic principles, the flow law of molten iron after pouring, brass gear Suppliers white mold gasification and gas residue The law of movement of objects and the law of slag inclusion and carbon deposit defects are more suitable for the following types of castings: (1) the most suitable gray iron castings according to the material, followed by ductile iron, cast steel, and finally aluminum.

They must be able to cast according to different materials, different structures, and different sizes. From the perspective of development trends, lost foam casting will not replace traditional casting methods. Lost foam process requirements The lost foam casting process has stricter requirements on production conditions. First, the company's own talent situation. This is still true of the traditional casting that has been developed for thousands of years, and the lost foam casting that has been born for decades is even more foggy. Gas eyes, slag holes, and sand holes greatly improve the yield of castings, improve the internal quality and appearance quality of castings, and improve the economic benefits of enterprises. Features of lost foam process (1) No sand core is used, no matter how complicated the casting is, a white mold is enough. The scope of application of the lost foam process The production enterprises should clearly realize that the lost foam process is not a versatile process. The price is low, the specifications are complete, the quality is excellent, the size can be customized and supplied in a timely manner, welcome to come to order by letter. People just broke away from the closed mechanism and were preparing for a big job with enthusiasm. "At present, China's lost foam casting is still developing rapidly, and about one hundred enterprises are launched every year.

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With the upgrading of the quality of China's machinery industry products and the further expansion of the export casting market due to the increase in the demand for castings in the world, more and more companies (or enterprises) in China choose to switch from dry casting process of clay sand to self-hardening resin Sand casting process. Compared with the dry casting process of clay sand, the self-hardening resin sand casting process has the following advantages: good casting surface quality, high dimensional accuracy, low scrap rate, wide application range, and low technical requirements for workers, greatly reducing the workers’ Labor intensity and improve working environment. But its shortcoming is that the casting cost is higher. In order to reduce the casting cost, each casting production unit is exploring ways to reduce the casting cost. In 2002, a company launched a new self-hardening resin sand production line with an annual output of 3,000 tons of cast iron parts. After more than four years of continuous exploration, we believe that the cost of resin sand casting can be reduced from equipment, raw materials, production technology, etc. consider. 1. Choosing the right self-hardening resin sand production equipment is the prerequisite for reducing the cost of resin sand casting.

When choosing resin sand production equipment, not only should we consider the actual situation of the enterprise, to select the appropriate price equipment, but also should consider the operating cost of the equipment. The following items should be considered: 1. The choice of dust removal equipment should be emphasized. When choosing production equipment, most companies tend to pay more attention to the quality of sand mixing equipment and regeneration equipment, while ignoring the quality of dust removal equipment. In fact, the quality of the dust removal equipment directly affects the quality and cost of the recycled sand. If the dust removal effect of the dust removal equipment is not good, it not only affects the working environment and pollutes the air, but also affects the fine powder content of the recycled sand. As a result, the production cost is increased due to the increase in the amount of resin added during sand mixing. 2. The reliability of the equipment and its maintenance costs must be considered. The processing methods, assembly level and equipment configuration level of the equipment manufacturer determine the reliability of the equipment it produces. If the reliability of the equipment is poor, the probability of equipment failure is large. Replace The number of equipment parts increases and the utilization rate of equipment decreases. This not only increases the workload of maintenance workers and maintenance costs of equipment, but also reduces production efficiency and increases production costs. 3. It is necessary to consider the energy consumption of the equipment.

On the premise of meeting the process requirements, try to reduce the installed capacity, avoid the phenomenon of big horses and carts, make full use of inherent resources, reduce unnecessary waste of energy, and achieve full utilization of equipment and maximum energy utilization To increase enterprise and social benefits. Second, formulating correct and reasonable production processes is the key to reducing the cost of resin sand casting. Is the production process reasonable or not, directly affecting the yield of castings, casting quality and casting costs, when formulating production processes, the following should be determined Item: 1. Determine the LOI value of the appropriate reclaimed sand. The LOI value, that is, the ignition loss, is an important indicator to measure the rate of release of the reclaimed sand. It is also an indicator that is closely related to the gas generation of the molding sand and the porosity defects generated by the casting. Furan resin sand is generally used for production. Practice has proved that the LOI value controlled at about 3% can fully meet the production requirements, and some companies require the LOI value to be controlled below 2.5%. To achieve this goal, you must add more equipment or increase The number of sand regeneration, or more new sand will be added, which will undoubtedly increase equipment investment and regeneration costs and raw material costs. During the production process, our company gradually relaxed the control index of LOI value from about 3% to about 4%.

Due to the proper process and management, the quality index of castings has not gear shaft Manufacturers been affected by the change of LOI value. 2. Determine the appropriate casting process parameters (1) Determine the appropriate final strength Generally, after the resin sand is mixed, it can reach the highest strength, that is, the final strength after about 24 hours of self-hardening. Due to the different production conditions and production scale of each enterprise, the time interval from molding to pouring does not necessarily exceed 24 hours, so the determination of the final strength should be determined by the enterprise. Small-scale enterprises that implement a one-day furnace system can adopt the 24-hour final strength standard; for 24-hour enterprises that do not exceed the mold curing time, the strength reached before pouring is used as the final strength standard. At the same time, there are two trends that must be overcome in production: on the one hand, blindly increasing the strength to ensure quality, which increases casting costs and causing waste; on the other hand, lowering the strength to ensure cost, resulting in unstable quality and fluctuating range Large, so that the quality of castings is greatly affected by raw materials and operators. Each enterprise should determine the appropriate final strength according to its own situation, so as to maximize the saving of resin and curing agent and reduce the cost of casting while ensuring the quality of the casting.

(2) Determine the appropriate sand-iron ratio of self-hardening resin sand. Because of its high strength, mold release after solidification, and smooth parting surface, its sand consumption is smaller than that of clay sand, but its sand-iron ratio also has certain requirements. If the cast iron-to-iron ratio is too high, both resin and curing agent will be wasted in the production process and large waste sand blocks will be generated, which will increase the burden on the regeneration machine, reduce the film removal rate, increase the LOI value, and increase the possibility of blowholes in the casting Large; If the sand-iron ratio is too low, it is easy to run off during casting, and the casting is easy to deform. According to our experience, the ratio of sand to iron should be chosen as 2.2~3:1. (3) Determining the yield rate of castings with appropriate molding technology directly affects the casting cost. Proper molding technology can not only ensure the quality of castings, but also reduce casting costs. Reducing casting scrap rate is the most obvious and direct measure to reduce casting costs. one. When determining the molding process, try to make special sandboxes with multiple air holes on the wall, make solid samples of the model, use template molding, the casting system adopts ceramic tubes, and the inner gates are taken to be more and more dispersed.

The paint is evenly brushed and does not leak. The air outlet is provided to ensure the smooth exhaust of the core. 3. The correct selection of raw materials is the basis for reducing the cost of resin sand casting. The choice of raw materials has a great influence on the casting cost, which has been recognized by most peers, because the quality of raw materials affects the addition and consumption of various materials on the one hand, and the castings on the other. Quality Index. 1. Selection of raw sand Raw sand is divided into ordinary sand, washed sand, scrub sand and other types. Because the content of mud in scrub sand is already very small, it can greatly reduce the waste of resin. It should be selected first, followed by washed sand. But never use untreated raw sand. The price of the scrub sand itself is not high, generally 50 yuan/t to 70 yuan/t, but its freight is relatively high, such as the scrub sand of a sand factory in Dalin purchased by our company is 65 yuan/t, but the total cost is shipped to the company It is 280 yuan/t. When choosing molding sand, one must follow the principle of selection nearby, so that on the one hand, it can reduce the expensive freight, on the other hand, it can guarantee the supply and not affect the production. Second, try to use 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 sand, the scrubbing sand production enterprise should be inspected and inspected. Technical status, equipment status and sand source status, etc., and find out the sand quality control results of the other party. In short, in the process of selecting raw sand, it is best to test and compare the methods and refer to other issues to minimize production costs on the premise of ensuring production and quality. 2. Selection of resin The price of resin is more expensive, generally around 10,000 yuan/t, so it has a greater impact on the casting cost. At the same time, due to the uneven production equipment of the manufacturers, the quality of the resin produced also varies greatly. If a poor quality resin is selected, it will not only affect the quality of the molding sand, but also increase the casting waste and increase the amount of resin added. The direct result is to increase the casting cost. Therefore, the choice of raw materials cannot only be based on the manufacturer. The technical data provided is determined, and the manufacturer’s production equipment, production process and quality control methods should be understood, and the resin indicators should be tested as far as possible or the relevant credible inspection department should be invited to perform the inspection, or Learn from the experience of similar manufacturers, or choose products from well-known large enterprises with good reputation.

Our company has been using resins produced by Jinan Shengquan Group since the beginning of production. Due to its good resin quality and stable performance, although its price is higher than some companies, due to its small amount of addition and stable production process, its The actual production cost is not as high. 3. Selection of other raw materials Other raw materials include curing agents, coatings, adhesives, release agents, sealing strips, etc. The impact of these raw materials on the quality of castings is not major, but the impact on casting costs cannot be ignored, such as The difference in the amount of curing agent added not only affects the production cost due to the production efficiency of the molding process, but also affects the material cost. Therefore, the selection principle of other raw materials is to consider not only its quality issues, but also its matching with the main materials such as procurement and transportation convenience. In short, as long as the equipment selection is reasonable, the performance is reliable, the operation is normal, the raw material selection is matched, the quality is stable, the supply is timely, the production process parameters are set reasonably, and the tooling equipment is guaranteed, the self-hardening resin sand casting can control and reduce the casting cost, which brings to the enterprise Development and benefits.

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Since the gravity casting of non-ferrous metals (such as copper, lead, zinc) casting is a casting process completed under the gravity operation of the earth, the matched gravity casting mold has reusability and availability is very high of. In the casting process, air pressure gas (gas) or mixed mist of air pressure gas and water is generally used as a cooling medium (a substance that plays a decisive role), so that the gravity casting mold and the casting itself can be cooled and solidified. Nonferrous castings are nonferrous alloys used for casting castings (see Nonferrous Metals). They are a type of casting alloy. There are mainly cast copper alloys, cast aluminum alloys, cast magnesium alloys, etc.

In order to avoid the deformation of the casting after heat treatment, a certain processing size must be reserved during the design. Pressure casting refers to a technology in which the molten metal is injected into the mold under other external forces (role), so its die casting mold is limited by principles and mold materials, and is mainly used for non-ferrous metals (such as Copper, lead, zinc) liquid molding. Nonferrous castings are nonferrous alloys used for casting castings (see Nonferrous Metals). They are a type of casting alloy. There are mainly cast copper alloys, cast aluminum alloys, cast magnesium alloys, etc. When performing pressure casting, the cavity of the die-casting mold is located above the pouring system, which requires the assistance of an injection machine to meet the conditions. Because the die-casting model cavity is made of metal with a higher melting point, the cost (Cost) price is higher and the price will be relatively expensive.

Regardless of price, usage or structure, gravity casting molds and die casting molds are obviously different, but they are one of the essential conditions for the development of different casting processes (tiáo jiàn). Because whether it is gravity casting mold or die casting mold, we must ensure that its quality and accuracy meet the requirements. Although there are many casting technologies, the only one that is widely used at a moderate price is non-ferrous metal worm wheel factory casting, which is the reason why users attach great importance to this. Correspondingly, in the process of nonferrous metal casting, the right process and mold must be selected (title: mother of industry).

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There are many factors that affect the quality of copper (chemical formula Cu) castings in the process of making. The design technology performance of machine tool castings, in the design process, in addition to the need Effectively determine the geometry and size of its machine tool castings according to its working conditions and metal materials. Copper (chemical formula Cu) castings must be effectively considered from the perspective of the casting process (technology) characteristics of the rationality of its design, so that obvious size effects and solidification (solidification), shrinkage, stress and other issues, so that it can Effectively avoid and reduce the segregation and cracking (k?i liè) and other defects of its copper castings. Non-ferrous metal casting Non-ferrous metal smelters often supply metal ingots with a certain chemical composition for subsequent processes to formulate various alloys; smelters and processing plants are also often separated.

The casting technology of copper castings needs to be reasonable. When using it, it is necessary to effectively select the appropriate parting surface and Modeling and core making methods, set up its cold iron, casting ribs, riser and pouring system (system), etc. reasonably. The process performance of machine tool casting design (xìng néng) will directly affect the quality (Mass) of its copper (chemical formula Cu) castings. In order to effectively determine the geometry and size of its machine tool castings, it is also necessary to design rationality and solidification shrinkage from the perspective of casting alloys and casting process characteristics. When the position of the shrinkage hole of the copper casting is effectively determined, the solidification area of ??the copper casting is determined to a certain extent.

We actually will notice that in actual practice, it is actually possible. Directly, the isosolid method is used to determine. Non-ferrous metal casting has a large share (sometimes nearly half) in the use of non-ferrous metal materials, forming a large and complex series of casting alloys. . Non-ferrous castings have higher specific strength and specific stiffness, good shock absorption and T coupler plug excellent cutting performance. Parts used in the aviation industry, instruments, radio technology and transportation industries. When the cold iron is placed directly on the bottom edge of the copper (chemical formula Cu) casting, in fact, it is because the cooling rate of the place is increased. Speaking of it, it will actually concentrate on the upper part of the casting.