Специфични методи за анализ и елиминиране на лошо разрушаване на машини за леене на инжектиране

Специфични методи за анализ и елиминиране на лошо разрушаване на машини за леене на инжектиране
If the injection molding machine has poor demolding, also known as sticking mold runner, it is because the contact surface between the needle mouth and the nozzle arc is not good, the gate material does not demold with the product, and the packaging is abnormal. Generally, when manufacturing demolding, the main channel diameter should be large enough so that the gate material is not completely solidified.

Whether it is a sticking mold runner or a product sticking to the mold hole, poor demolding is an important killer of plastic injection molding. The root cause of poor demolding may be different parts of the injection molding equipment, or it may be caused by improper injection molding process. Although there are no burrs, lack of drawing mold slopes, and drawing mold slopes caused by errors in part design and mold design, sometimes molded parts will be demolded. When forced to eject, warped parts are often formed, and they turn white or cracked after ejection. In particular, molded parts stick to one side of the static mold and sometimes cannot be ejected.

If there are external defects such as gouges, scratches, scars, and depressions in the mold cavity and runner, the plastic parts will simply adhere to the mold, causing demolding difficulties. Therefore, the surface finish of the mold cavity and runner should be improved as much as possible, and the inner surface of the mold cavity should be chrome-plated as much as possible. When polishing, the direction на полиращ материал трябва да съответства на посоката на разтопения материал, запълващ формата .

Когато разтопеният материал падне в надрасканата част на формата или пролуката между вложките, разрушаването също ще причини затруднения . Следователно повредената част трябва да бъде поправена и пролуката за вмъкване трябва да бъде намалена .

If the mold does not open at the beginning of injection, it means that the mold will be deformed due to lack of rigidity under the action of injection pressure. If the deformation exceeds a certain elasticity, the mold cannot be restored to its original state and cannot be used further. Even if the deformation does not exceed the elasticity of the mold to a certain extent, the molten material cools and solidifies in the кухина в много високо състояние . След отстраняване на налягането на инжектиране, формата възстановява деформацията и пластмасовата част се захваща от действието на силата на отскок .