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Plastic mold appearance treatment

Essai Industries Co.,Ltd | Updated: Mar 29, 2018

Plastic mold appearance treatment


It also suppresses the corrosion process and facilitates surface brightening.


1.5 Fluid Polishing


Fluid polishing relies on the high-speed flow of liquid and the abrasive particles it carries to flush the surface of the workpiece for polishing purposes. Common methods are: abrasive jet machining, liquid jet machining, fluid power grinding and so on. Hydrodynamic grinding is driven by hydraulic pressure so that the liquid medium carrying the abrasive particles reciprocates across the surface of the workpiece at high speed. The medium is mainly made of a special compound (polymer-like material) that flows at a relatively low pressure and is made of an abrasive material. Silicon carbide powder may be used as the abrasive.


1.6 Magnetic Abrasive Polishing


Magnetic abrasive polishing is the use of magnetic abrasives to form abrasive brushes under the action of a magnetic field, grinding workpieces. This method has high processing efficiency, good quality, easy control of processing conditions and good working conditions. With suitable abrasives, the surface roughness can reach Ra 0.1 μm.


The polishing mentioned in the plastic mold processing is very different from the surface polishing required in other industries. Strictly speaking, the polishing of the mold should be called mirror processing. It not only has high demands on the polishing itself but also has a high standard for surface smoothness, smoothness, and geometric accuracy. Surface polishing generally requires only a shiny surface. The standard of mirror processing is divided into four levels: AO=Ra0.008μm, A1=Ra0.016μm, A3=Ra0.032μm, and A4=Ra0.063μm. It is difficult to accurately control the geometric accuracy of parts due to electrolytic polishing and fluid polishing. , And the chemical polishing, ultrasonic plastic mold polishing process Downloads https://www.wenkuxiazai.com/doc/8f53a269011ca300a6c39066-2.html Polishing, magnetic abrasive polishing and other methods of surface quality can not meet the requirements, so precision molds The mirror processing is still dominated by mechanical polishing.


2.1 Basic procedures for mechanical polishing


In order to obtain a high-quality polishing effect, the most important thing is to have high-quality polishing tools and auxiliary products such as whetstone, sandpaper and diamond abrasive paste. The choice of polishing procedure depends on the surface conditions after the initial processing, such as machining, EDM, grinding and so on. The general process of mechanical polishing is as follows:


(1) Rough turning Surfaces after milling, EDM, grinding, etc. can choose speeds of 35 000-40 000


The rpm's rotating surface polisher or ultrasonic grinder polishes. The common method is to use a wheel with a diameter of Φ3mm, WA # 400 to remove the white EDM layer. This is followed by manual whetstone grinding, strip whey and kerosene as lubricants or coolants. The general order of use is #180 ~ #240 ~ #320 ~ #400 ~


#600 ~ #800 ~ #1000. Many mold makers choose to star