The foundry tells you the principle, advantages and disadvantages of the low pressure casting machine

2019-06-03

The low-pressure casting machine has great effects in the automobile consumer manufacturing industry. The initial description is in the 20th century. It did not terminate the large-scale industrial production consumption until 1958. In the UK, the low-pressure casting technology was first used in the car in 1958. In terms of consumption, this has gradually aroused the attention of people from all walks of life. What is the basic principle of low pressure casting? How can it become a process technology? Please see Qinhuangdao Hongtong Machinery Co., Ltd. for your analysis.

The basic principle of the low-pressure casting essence is to release the gas pressure or the rare gas working pressure which is 0.02~0.05 MPa higher than the atmospheric pressure on the surface of the sealed furnace, and the molten soup is immersed in the molten soup. The tube (riser tube) is raised and embedded in the abrasive tool on the upper side of the furnace. The melt soup is filled with the gradual turning point of the lower side of the cavity, and is condensed after the working pressure of the uninterrupted period of time. Condensation is the migration from the top turning point of the commodity to the direction of the rubber inlet. The morning when the rubber inlet is partially condensed is the time when the filling is completed. Therefore, the perfect casting is obtained by the specific condensation of the rubber inlet and the actual working pressure of the riser from the turning point of the rubber inlet. Finally, the product can be removed from the tool while the casting water is cooled to the solid phase temperature.

Low-pressure casting machines are still not sound, and they have many advantages in the contemporary world, and they also have shortcomings.

Advantage:

1) The forging use rate is very high. (86~96%) Because there are no risers and sprues, the glue inlet is small, so the teaching materials and production and processing hours can be greatly reduced.

2) Obtain a perfect casting. It is very easy to form a specific condensation, with few internal defects.

3) The vapor and dirt are deeply trapped. The rate of charge can be modified and the melt is terminated by a clean bench.

4) A sand core can be applied.

5) It is very easy to carry out automation technology, and it can safely operate in several safe operations and multiple process flows.

6) It is not subject to the level of skill of the operator.

7) The application of materials covers a wide range.

Disadvantages:

1) The self-sufficiency of the glue inlet scheme is small, thus limiting the commodity. (The location of the glue inlet, the total number of restrictions, the internal wall thickness of the product, etc.)

2) The forging period is long and the consumption is poor. In order to maintain specific condensation and melt activity, the mold temperature is high and the condensation is very slow.

3) The mechanism of the near-injection port is thicker, and the physical properties of the lower profile are not high.

4) In order to ensure the shape and location of the rubber inlet, it is required to have a comprehensive and inseparable management method (temperature, working pressure, etc.). In the whole process from time to time, the low-pressure casting often has a problem with the line bottleneck, whether international or In China, the progress is very rapid, and the customer's post request for car performance and environmental protection is slowly developing, and the technical post request for low-pressure casting will be higher and higher.