Hongyu Machinery Equipment Co., Ltd. Shanxi temperature and other static press development restrictions factors
With the development and application of powder molding process in the fields of high-temperature refractory materials, carbon materials, ceramic materials and rare metals, the temperature isostatic press that can meet the molding of these materials has attracted more and more attention. However, it is also due to the fact that the manufacturing technology of temperature isostatic press in China is not very mature, and foreign developed countries have some restrictions on the introduction of such equipment in China, which makes the development of temperature isostatic press in China limited to a large extent.
Pressure control accuracy is one of the problems that need to be solved by temperature isostatic presses in China, and the factors affecting pressure control accuracy are mainly as follows:
1. Temperature. Temperature is a very important factor affecting the accuracy of pressure control. When the temperature isostatic press presses different blanks, the temperature in the working cylinder will be different, the temperature difference will affect the viscosity of the medium oil, and the change of viscosity directly affects the rate of pressure relief, which in turn affects the pressure accuracy control in the pressure relief process.
2. The reciprocating motion of the supercharger in the boost stage will cause pressure value fluctuations.
3. The medium oil brush during the pressure relief process washes the pressure relief valve core. In the process of pressure relief of temperature isostatic press, the medium oil under high temperature and ultra-high pressure will produce strong erosion of the valve core of the pressure relief valve, so that the caliber of the valve core will gradually become larger, resulting in a decrease in pressure control accuracy.
4. Oil leakage. Since the working temperature and pressure of the isostatic press are relatively high, the viscosity of the medium oil in this state will decrease, so oil leakage may occur, which will affect the pressure control accuracy.
We can start from the above four aspects to solve the problem of pressure control accuracy of temperature isostatic press in China, so that it can be more widely used
How does Hongyi Machinery Equipment Co., Ltd. choose the right cold isostatic press equipment? Shanxi cold isostatic press equipment
Different users have different needs for Shanxi cold isostatic presses. Many users, especially those who choose cold isostatic presses for the first time, face many difficulties in terms of technical parameters, production efficiency, and investment amount. Simply refer to the procurement of users in the same industry, and it is easy to cause overuse, or cannot fully meet the requirements of the new process, or the ratio of input and output is imbalanced.
How to choose a cold isostatic press suitable for your own requirements, you need to consider the following points:
First, the selection of the volume size of the pressing cylinder:
1. The cold isostatic press pressing cylinder is a cylindrical container, and the selection of its charging diameter and height size is particularly critical;
2. The selection of charging diameter should be considered:
A. It is necessary to be larger than the large size of a single pressed product compactor (including mold);
B. Due to the diameter size of the pressing cylinder, it has a great impact on the cost of the equipment, and it is necessary to comprehensively consider the placement form, quantity and production efficiency of the single-laminated blank (including mold) in the diameter direction;
C. Consider the space of the compacted hanging rail.
3. The selection of charging height should be considered:
A. It is necessary to be larger than the large size of a single pressed product compactor (including mold);
B. Due to the limited impact on the equipment cost due to the comparison between the height and diameter of the pressing cylinder, the number of layers and the best production efficiency of the compacted (including mold) are mainly considered;
C. Whether the height space of the plant meets the lifting requirements of the hanging rail;
D. Select the pit or ground installation method.
Second, the choice of high working pressure:
1. High working pressure has a great impact on equipment cost, and the pressure selection is too high, which is easy to cause high production cost, low relative production efficiency and increased investment;
2. First determine the working pressure of the required pressed product; Proven process technology can be determined experimentally or adopted;
3. The high working pressure of the selected equipment should be 20~50MPa higher than the working pressure of the product;
4. When the size and working pressure of a variety of products differ greatly, it is more appropriate to consider choosing equipment of different specifications.
Third, to meet the requirements of the pressing process:
1. Products of different materials have different pressing process (pressure-time curve) requirements; The equipment needs to have the function of satisfying its corresponding process;
2. With the development of technology, the current cold isostatic press equipment can meet the following pressing process requirements:
A. Standard pressing curve
B. Standard proportional pressure relief curve
C. Variable speed boost-full proportional pressure relief curve
3. When selecting equipment, enterprise technicians should communicate with manufacturers to ensure good process and efficiency.
IV. Consideration of maintenance costs:
1. Single media structure, with the same specifications, the charging space is large, but the maintenance cost is high in use, and the maintenance personnel are high;
2. Double media structure, with the same specification, the charging space is small, but the maintenance cost is low in use;
3. If you press high-hardness materials such as ceramics, metallurgy, and refractory materials, and the maintenance strength is poor, you should try to choose a dual-media structure.
5. Consideration of the ratio of investment to output.
