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Key points for die vibration molding process?
Publish Time：
2022-10-12 09:10
In principle, the core vibration process only requires one set of molds to produce products of one or more specifications and varieties. Therefore, in this case, the consistency of product dimensions is very high, and the processing quality of the steel mold is even more important. Steel mold design is of particular importance. Below are some points to note in core vibration molding?
In principle, the core mold vibration process only requires one set of molds to produce products of one or more specifications and varieties. Therefore, in such cases, the consistency of product dimensions is very high, and the processing quality of the steel mold is even more important. Steel mold design has its special importance. Below, we will discuss the points to note in core mold vibration forming?
When forming with core mold vibration, it should be noted that if the inclination angle of the runner work surface is small, when lifting the roller table, because the concrete has not yet gained strength, under the action of friction, annular cracks will appear, and cracks are prone to occur at the steps of the socket work surface. The inclination angle should be increased to 0.5o～1.0o. In addition, the number and position of the reinforcing ribs are reasonable, the vibration transmission efficiency is high; or its template is light and elastic, and can turn the concrete mixture into a liquid phase with low power, reducing the vibration phase lag angle. Reduce surface bubbles and ensure the uniformity of the concrete texture after vibration. Of course, there are also some gentler aspects. That is, the strength of the steel plate and the rigidity of the mold must meet the requirements; the dimensions must be accurate, and the mold joints must be leak-proof; the surface of the steel mold should be smooth, and the welds should be polished smoothly; the cylinder should not have any knocking dents; the pipe diameter is uniform, and the cone diameter difference is 3mm, ensuring smooth demolding, reducing adhesion resistance, reducing the load on lifting machinery and equipment, and preventing concrete from cracking. Its welds must be firm. If the welding frame welds during the forming process, the steel bars will rebound after demolding, causing breakage. At this time, the outer diameter of the steel frame locator should be 2-5mm smaller than the inner diameter of the outer mold, otherwise, the steel frame will rebound after demolding, causing the pipe concrete to crack.
The start of core mold vibration depends on the pipe specifications and vibration parameters. Vibration starts after feeding to a certain height (1/4～1/3) or 500mm. If the equipment vibrates empty and the noise is loud, the vibrator and pipe shape are easily damaged; if the vibration is too late, the gas in the mixture below is difficult to discharge, and bubbles and many small pits will remain on the pipe wall, resulting in high density and decay. Then there is the feeding and vibration forming, which is fed by a rotary distributor, and coordination is needed while feeding. While adjusting the parameters according to the specifications of the produced pipes, adjust the feeding speed and feeding amount. When the product is almost ready, the dimensions of the end bearing work surface are completed by rolling. At this time, the purpose of rolling is to flatten the upper concrete surface and make the concrete distribution on the bearing work surface uniform; under pressure, the required shape is produced through core mold vibration. During the entire process of the bearing, high frequency should be maintained to ensure density. Or core mold vibration is mainly vibration, the upper vibration time is short, and additional rolling force is applied during vibration. Therefore, during operation, attention should be paid to slow and gradual pressurization to avoid "damage" and make it difficult to form the top of the socket. It also avoids the compression and sinking of the circumferential steel bars.
After the introduction of the above content, we also understand the points to note in core mold vibration forming. Other knowledge points will be updated in the next issue. If you have time, please watch it quickly. I believe it can help you.
Die vibration
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