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Solution of Burr in Injection Molding

Solution of Burr in Injection Molding

In the injection molding production process, the occurrence of burrs is a common problem. It will directly affect the quality of the product, so the injection molding process master needs to find the problem in time and give a solution. First of all, we need to pay attention to controlling the injection pressure during the injection molding process. Excessive injection pressure can easily lead to excessive flow of material in the mold, resulting in burrs. Therefore, we should reasonably adjust the injection pressure to avoid excessive pressure adversely affecting product quality.

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How to deal with the problem of stripes when processing injection molded parts?

How to deal with the problem of stripes when processing injection molded parts?

The correct planning, careful processing, reasonable mold repair and timely nitriding of injection molded parts are the key methods to avoid the defects of stripes. In the process of injection molding, it is necessary to strictly follow the drawing requirements for processing, and pay special attention to improving the appearance of the shunt hole and the mold bridge is dripping form to improve the flow state of solid metal and reduce the heat generated by friction. For the injection mold extrusion with tissue stripes, the mold repair worker should personally go to the site to understand the discharge of the injection mold and determine the correct mold repair plan. The mold repairer should personally observe the instantaneous state of the profile discharge, which is more effective than observing the profile discharge head to determine the mold repair plan. In addition, for products, nitriding treatment should be carried out in time according to regulations to ensure the reasonable activity state of solid metal.

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Plastic mold processing injection molding

Plastic mold processing injection molding

1. Cylinder temperature: The temperature to be controlled in the injection molding process includes cylinder temperature, nozzle temperature and mold temperature. The first two temperatures mainly affect the plasticization and flow of plastics, while the latter temperature mainly affects the flow and cooling of plastics. Each plastic has a different flow temperature, the same plastic, due to different sources or grades, the flow temperature and decomposition temperature is different, this is due to the average molecular weight and molecular weight distribution is different, plastic in different types of injection machine within the plasticizing process is also different, so the choice of barrel temperature is not the same.

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Plastic mold processing injection molding customization

Plastic mold processing injection molding customization

Plastic mold has developed from simple surface processing to all-round processing of surface and structural surface, from medium and low speed gear processing to high speed processing, and the development of processing automation control is very rapid. The clamping force shall be sufficient. At present, many plastic molds made of exquisite plastic mold. In order to better mold quality level, we must pay attention to these when making plastic molds. Next, I will share my experience in mold production and manufacturing with everyone. A mold must be equipped with side locks (straight cylinder locks.

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Surface treatment methods of commonly used plastic molds

Surface treatment methods of commonly used plastic molds

Chlorination is divided into nitrogen seepage and nitrogen carbon co-osmosis. The biggest advantage of this process is that the heat treatment temperature is low (usually 500-600), the deformation after heat treatment is small, the nitride layer is very hard, so that the wear resistance of the mold And anti-bite improved. The corrosion resistance, heat resistance and fatigue strength of the mold have been greatly improved. 1. Nitriding: Nitriding methods are divided into gas nitriding, liquid nitriding, solid nitriding, ion seepage chlorine and so on. At present, gas nitriding is commonly used, which is to pass nitrogen (NH3) into a furnace of about 550, and the nitrogen obtained by ammonia decomposition penetrates into the steel. The nitriding time is longer, generally about 0.015-0.02mm per hour for shallow layers, and about 0.0050.015mm per hour for deep nitriding. In high alloy steel, due to the high content of alloy elements, the diffusion rate of nitrogen is low, and the nitriding rate will be lower than the above data. The time of gas nitriding (the workpiece is less than 300 X300X50mm) is generally 8-9 hours, the depth of the seepage layer is between 0.1-0.2mm, the surface hardness after nitriding is between HV850-1200 mm (HRC65-72 mm), and the surface color is bright.

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2023

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At present, the commonly used polishing methods are the following

At present, the commonly used polishing methods are the following

1.1 mechanical polishing: Mechanical polishing is a polishing method to obtain a smooth surface by cutting and plastic deformation of the surface of the material to remove the polished convex part. Generally, oilstone strips, wool wheels, sandpaper, etc. are used, mainly by manual operation. For special parts such as the surface of the rotary body, auxiliary tools such as turntables can be used, and the method of ultra-fine polishing can be used for high surface quality requirements. Super-finishing polishing is the use of special grinding tools, containing abrasive polishing fluid, tightly pressed on the workpiece is processed surface, for high-speed rotation. 1.2 chemical polishing Chemical polishing is to make the surface of the material in the chemical medium micro convex part of the concave part of the preferential dissolution, so as to get a smooth surface. The main advantage of this method is that it does not require complex equipment, can polish workpieces with complex shapes, and can polish many workpieces at the same time, with high efficiency.

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