Combining the casting process of no-bake resin sand casting equipment, sanzhuji concluded that to reduce the casting cost of no-bake resin sand, it can start from the equipment, raw materials, production process, etc., and reduce costs and increase efficiency through scientific methods.
1 Choosing the appropriate no-bake resin sand production equipment is the prerequisite for reducing the cost of no-bake resin sand casting. When choosing no-bake resin sand production equipment, not only the actual situation of the company should be considered, and the equipment at the appropriate price should be selected. Considering the operating cost of the equipment, the following should be considered:
1.1 Pay attention to the selection of dust removal equipment. When selecting production equipment, most companies often pay more attention to the quality of sand mixing equipment and recycling equipment, but ignore the quality of dust removal equipment. In fact, the quality of the dust removal equipment directly affects the quality and cost of the reclaimed sand. If the dust removal effect of the dust removal equipment is not good, it will not only affect the working environment and pollute the air, but also affect the fine powder content of the reclaimed sand. The result is an increase in production costs due to the increase in the amount of resin added during sand mixing.
1.2 Consider the reliability of the equipment and its maintenance costs. The processing methods, assembly level and equipment configuration level of the equipment manufacturer determine the reliability of the equipment produced by it. If the reliability of the equipment is poor, the probability of equipment failure is high. Replace the equipment The number of parts and components increases, and the utilization rate of equipment decreases. This not only increases the workload of maintenance workers and increases equipment maintenance costs, but also reduces production efficiency and increases production costs.
1.3 Full load utilization of existing equipment and maximum energy utilization will increase corporate and social benefits.

2 The development of a correct and reasonable production process is the key to reducing the cost of no-bake resin sand. Whether the production process is reasonable or not directly affects the yield, quality and cost of castings. When formulating the production process, it should be determined. The following items:
2.1 Determine the LOI value of suitable reclaimed sand
LOI value, i.e. ignition loss, is an important indicator to measure the release rate of reclaimed sand, and it is also an indicator closely related to the amount of gas evolution of molding sand and the occurrence of pore defects in castings. Cast iron parts are generally produced with furan resin sand. Practice has proved that LOI value control 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, it is necessary to increase equipment, or increase the number of sand regeneration, or add more new sand. This is undoubtedly Will increase equipment investment and regeneration costs and raw material costs. During the production process, our company gradually relaxed the LOI value control index from about 3% to about 4%. Due to proper process and management, the quality index of castings was not affected by the change of LOI value.
2.2 Determine the appropriate casting process parameters
2.21 Same, the time interval from modeling to pouring does not necessarily exceed 24 hours, so the final strength should be determined by the enterprise. For small-scale enterprises that implement a furnace system for several days, the 24-hour final strength standard can be used; for those that do not exceed the 24-hour mold curing time, the final strength standard is the strength achieved before pouring. At the same time, two tendencies must be overcome in production: on the one hand, the strength is blindly increased to ensure quality, which increases the cost of casting and causes waste; on the other hand, the strength is reduced to ensure cost, resulting in unstable quality and fluctuation 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 save the resin and curing agent to the greatest extent and reduce the casting cost while ensuring the quality of the casting.
2.22 Determine the appropriate sand-to-iron ratio because of its high strength, mold release after curing, and smooth parting surface, so its sand consumption is smaller than that of clay sand, but its sand-to-iron ratio also has certain requirements. If the casting sand-to-iron ratio is too high, both resin and curing agent will be wasted during the production process, and larger waste sand blocks will be produced, which will increase the burden on the reclaimer, reduce the release rate, increase the LOI value, and increase the possibility of porosity in the castings. Large; if the sand-to-iron ratio is too low, it is easy to run out of fire during pouring and the casting is easy to deform. According to our experience, the ratio of sand to iron should be chosen to be 2.2~3:1.
2.23 Determine the appropriate molding process The yield of castings directly affects the casting cost. The appropriate molding process can not only ensure the quality of the castings, but also reduce the casting cost. Reducing the casting reject rate is one of the most obvious and direct measures to reduce the casting cost. . When determining the molding process, try to make a special sand box with more pores on the wall of the box. The model is made as a real sample, and the template is used for modeling. The pouring system uses ceramic tubes and the inner gate is more and more dispersed. The paint is evenly applied without missing coating. Set up air outlet to ensure smooth core exhaust.

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 greater impact on the cost of casting, which has been recognized by the vast majority of peers, because the quality of raw materials affects the amount and consumption of various materials on the one hand, and on the other Quality Index.
3.1 Selection of raw sand
Raw sand is divided into ordinary sand, water-washed sand, scrubbing sand, etc. Since the mud content in scrubbing sand is already very small, it can greatly reduce the waste of resin. It should be selected first, followed by water-washed sand, but it must not be used. Processed raw sand. The price of scrub sand itself is not high, generally 50 yuan/t to 70 yuan/t, but the freight is higher. For example, a foundry company cooperating with Sanzhuji buys scrub sand from a sand factory in Dalin for 65 yuan/t, but it is shipped to the company , The total cost is 280 yuan/t. When choosing molding sand, one must follow the principle of nearby selection, so that on the one hand, it can reduce expensive freight, on the other hand, it can guarantee the supply without affecting production. Second, try to choose raw sand with low angle 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 is also different. Therefore, if conditions permit, 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 discover the other party’s sand quality control results. In short, in the process of selecting raw sand, it is best to pass tests and comparisons, refer to other aspects, and under the premise of ensuring production and quality, minimize production costs.
3.2 Selection of resin
The price of resin is more expensive, generally around 10,000 yuan/t, so it has a greater impact on casting costs. At the same time, due to the uneven production equipment of manufacturers, the quality of the resin produced is also quite different. If a poor quality resin is selected, it will affect the quality of the molding sand, cause more casting waste, and increase the amount of resin added. The direct result will increase the casting cost. Therefore, the choice of raw materials cannot 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 try to inspect the various indicators of the resin or ask the relevant reputable inspection department to conduct the inspection, or Learn from the experience of similar manufacturers, or choose products from well-known large companies with good reputation. Since the beginning of production, our company has been using the resin produced by Jinan Shengquan Group. Due to its good resin quality and stable performance, although its price is higher than that of some enterprises, its added amount is less and the production process is stable. The actual production cost is also not high.
3.3 Selection of other raw materials
Other raw materials include curing agents, coatings, adhesives, mold release agents, sealing mud sticks, etc. The impact of these raw materials on the quality of castings is not the main one, but the impact on the casting cost 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 modeling process, but also affects the material cost. Therefore, the selection principle of other raw materials is not only to consider their quality issues, but also to consider their 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, the tooling and equipment are guaranteed, the self-hardening resin sand casting can control and reduce the casting cost, and bring it to the enterprise. Development and efficiency.

Qingdao Sanzhuji Equipment Manufacturing Co., Ltd. specializes in the production of sand reclamation equipment,foundry machines,Sand casting equipment,GS high efficiency rotary mixer,no-bake resin sand mixer,Jolt squeeze molding machine/Jolt-squeezing moulding machines,Multi- Piston Moulding Machine/Hydraulic multi-piston moulding machine,foundry molding machine,flaskless moulding machine,shot blasting machine,dust collector,according to the amount of old sand recovered Carry out plan customization, and provide sand reclamation equipment installation, commissioning, and training. Welcome guests to visit the factory.