Detailed procedures are as follows:
1. Crushing: The rubbing force of the grid plate is affected by the weight of the sand block and the striking force of the vibration motor. The manufacturer shall provide detailed data to ensure that the grid-plate rubbing force is less than the gravel impact resistance. Otherwise, the sand will be easily broken and refined, which will lead to the decrease of recovery rate of old sand and increase of production cost. From the microscopic point of view, an increase in the brecciform coefficient of sand and gravel (spherical best) will increase the surface area of sand and gravel, thus increasing the amount of resin and reducing the permeability of molding sand.
2. Defilm: In sand type, the resin film close to the casting range of 500℃ will be burnt and burnt. The presence of burnt paste film affects sand mold strength and wastes a lot of resin, which must be completely removed. and the resin film that did not burn paste deterioration is wrapped in sand grain surface, can reduce resin content already, can increase the concessional sex of sand type again, can not remove. The demulsification equipment USES the impact force to make the coke paste film fall off, and the impact force must be less than the impact force of sand and gravel. The manufacturer has the obligation to help the foundry enterprises to determine the reasonable ratio of sand and iron, so that the demulsification rate is ≥26% and the burning reduction is ≤4%.
The resin sand production line produced by Sanzhuji has little pollution to the environment, and the utilization rate of waste water can reach over 90%. The surface of regenerated sand is smooth and evenly distributed, which can save resin. According to relevant statistics, it can save up to 20% and reduce the production cost. Moreover, the property of regenerated sand is stable and easy to be controlled, which can greatly improve the quality of casting.
3. Resin sand production line is very stable, but it is greatly affected by crushing capacity, demultiplexing effect and dust removal effect. If not handled properly, it will result in the deterioration of product quality. The crushing capacity mainly depends on the friction of the grid plate, the vibration force of the vibration motor, and the effect of the gravity of the sand block itself. If the crushing is too fine, the recycling amount of the recycled sand will be reduced, resulting in the increase of cost. Demoulding effect affects the front of sand mold, if the demoulding is not done well, it will cause a lot of waste of resin. The dust removal system should be properly installed, which affects the air permeability of sand mold and the amount of resin used.
The combined effect of the above three factors has a significant impact on the quality and cost of resin sand production line products.
Advantages of resin sand production line:
1. High dimensional accuracy of casting, clear external contour, good surface and appearance quality of casting, and high comprehensive quality of casting with dense structure.
2. Resin sand has good fluidity, easy to tighten, release time can be adjusted, high strength after hardening, no deformation in the subsequent handling and closing process; Due to the high stiffness of resin sand during casting and solidification, the invisible wall displacement phenomenon, so the casting size accuracy is higher than that of clay sand and oil sand casting can be improved by 1-2 grades.
3. Without drying, the production cycle is shortened, energy is saved, and the drying process is eliminated. Molding sand is easy to be compactable and easy to be cleaned, which greatly reduces the labor intensity of workers and creates conditions for the realization of mechanized production.
Shortcomings of resin sand production line:
1. When curing time is needed after modeling, multiple sets of molds must be made in large batches
2. High requirements on the quality of raw sand
3. Free formaldehyde exists in the air with pungent odor during the molding and pouring site;
4. The production cost of resin sand is high.
I hope the above content is helpful to you. Welcome to visit and investigate
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.
