Isostatic pressing technology of Hongyi Machinery Equipment Co., Ltd. - cold isostatic pressing equipment
There are two kinds of cold isostatic pressing into plastic: wet bag method and dry bag method. The structure of the corresponding isostatic press is also different. General layout drawing of cold isostatic press
1. Isostatic pressing by wet bag method
The powder is loaded, directly hit the liquid pressure medium, and contact with the liquid. Hence the call wet bag method. This method allows arbitrary changes in the shape and size of the plastic envelope. The products are very flexible. Suitable for small-scale production. Every time it is necessary to carry out bagging and unloading operations, the production efficiency is not high, and large-scale production cannot be carried out continuously.
2. Isostatic pressing by dry bag method
The rubber bag is placed inside the cylinder first. After not taking out the powder during work, the powder is loaded into another molded plastic bag. Put in a pressurized rubber bag and do not come into contact with liquid. Hence the name of the thousand bag method. This method allows continuous operation by opening the upper cover. Charging from the hopper. Then cover the upper lid and apply pressure into acceptance. When discharging. Open the upper cover. Push the blank out of the top through the bottom stick. Short and suitable for batch production. But the product specifications are limited. Because the pressurized plastic mold cannot be replaced frequently. Due to the heavy use of the main wet bag method. Therefore, the following focuses on the wet bag structure.
3. Ultra-high pressure vessel
Ultra-high pressure vessels are the main equipment that is or other items of the workshop. It must have sufficient strength and reliable sealing. The structure of the container cylinder block. Threaded structure and frame structure are often used.
Frame type cold isostatic press threaded structure: the cylinder block is a crucible-shaped cylinder with an opening on the upper side, for safety and reliability. Reinforced steel hoops (hot sleeve and steel cylinder) are often installed outside to form a double-layer cylinder structure. The upper mouth of the cylinder barrel is connected and sealed with a threaded plug head. This structure is simpler to manufacture. However, the thread is easily damaged and the safety and reliability are poor. Less productive work. For ease of operation. Some are designed as open thread structure, after the plug head is loaded, it rotates 45', there is a hydraulic pressing device at the upper end.
Now the frame winding frame and container body structure is mainly adopted: the cylinder block is a cylinder, made of high-strength steel. Or wound with high-strength steel ribbon, the upper and lower plugs in the simplified body are movable, unthreaded connection. The axial force of the cylinder block is borne by the frame. This avoids the stress concentration of the thread structure, and works safely and reliably. For the case of large cylinder diameter and high pressure, it is more superior, but the investment is higher.
4 Ultra-high pressure pump and hydraulic system
The ultra-high pressure multiplier injects high-pressure liquid into the vessel. It is achieved through high-pressure pumps and corresponding pipes and valves. High-pressure pumps include (generally driven by the motor pulley to push the plunger to reciprocate), (by a large-area piston cylinder to push a small-area plunger high-pressure cylinder) and so on.
Hongyu Machinery Equipment Co., Ltd. isostatic press is a low-carbon new material, we all know that the current market needs this material, it is equivalent to steel from hardness and toughness, it also has special applications, let's take a look. We also know that the production of ceramics, generally to enhance the toughness of ceramics, usually introduces fibers or whiskers into the ceramic matrix, which requires a high temperature and a long time in the traditional sintering process. This leads to a degradation of surface strength and even a chemical reaction with the matrix using the introduced fibers and whiskers. Lost its role in strengthening resilience.
So that the effect of ceramic can not be achieved, but if we use this hot isostatic press to sinter ceramics, the sintering temperature and time are greatly reduced. Fiber or whisker-reinforced ceramic matrix composites with excellent performance can be obtained. Moreover, after measurement, the use of hot isostatic press sintering process, in 1085~C1]P to obtain SiC whiskers with a relative density of up to 91.5% to strengthen SiC ceramics, so that we can also know that the special application of hot isostatic press technology makes our ceramics more efficient. is more beneficial to our sales.
