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Gravity Die Casting

Gravity Die Casting Posted on : Nov 7 , 2022 By  GREFEE Definition of gravity casting process The gravity die casting process refers to the process that the metal liquid is injected into the casting mold by gravity, also named as casting. Gravity casting process include sand casting, metal casting, investment casting, lost foam casting, mud film casting, etc. The metal casting is modern technique of heat resistant alloy steel manufacturing die. During the gravity die casting process, the liquid metal…

How to improve the accuracy of precision injection molding parts

How to improve the accuracy of precision injection molding parts Posted on : Sep 16 , 2022 By  GREFEE Most of the plastic electronic parts adopt injection molding because these materials have high designing accuracy and are processed with specific engineering materials. For those that cannot be processed with ordinary injection molding, but precision plastic injection molding. To ensure the properties, quality, reliability and long term stability, the material, equipment of injection molding parts, mold design, injection molding process and…

Dark spots of products

Dark spots of products Posted on :Nov 9 , 2022 By  GREFEE Surface defects of injection molding products include dark spots, gloss differences or fogging areas, and surface wrinkles or so-called orange peel. The defects are usually detected around the gate or far away from the behind of the sharp corner of gates. The cause for the defects can be found easily from two aspects, mold and molding. Dark spots of products Dark spots are usually detected around the gates,…

Introduction of common medical plastics

Introduction of common medical plastics Posted on : Nov 4 , 2022 By  GREFEE The common materials used in the medical industry include glass materials, metal materials. Compared with glass and metal materials, the main characteristics of plastics include: (1). Low cost, can be reused without disinfection, suitable for the production of disposable medical devices. (2). Simple to process, can be produced into various useful structures with its plasticity. Metal and glass are difficult to be made into products with complex structures….

Causes and Solutions of Welding Line of injection molding

Causes and Solutions of Welding Line of injection molding Posted on : Nov 2 , 2022 By  GREFEE Among the defects in injection molding products, welding lines are the common ones, in addition to the injection molded parts with very simple geometry, welding lines can be found in many injection molding parts(normally is in the shape of one line or V-groove), especially for the large and complex products requiring the use of multi gate molds and inserts.   Welding lines…

surface treatment solutions for die casting mold

Surface Treatment Solutions for Die Casting Mold Posted on : Sep 3 , 2022 By  GREFEE Die casing model is one of the tools that are utilized to cast the metal parts, which is specifically completed on the die casting die forging machine. The basis process of die casting include: the metal liquid is injected into the mold cavity in a slow or high speed. The mold with moving mold cavity surfaces will be forged under pressure as the cooling of…

Between plastic injection molding and 3D printing molding

What is the difference between plastic injection molding and 3D printing molding? Posted on :Sep 13 , 2022 By  GREFEE There are two main methods for the plastic products molding. One is through mold injection molding, and the other is through 3D printing technology. The plastic injection molding refers to melt the plastic material completely thought the stir of the screw bar under a certain temperature, and then inject the plastic into the mold cavity to obtain the ending products…

Main processes of mold injection molding

Main processes of mold injection molding Posted on :Sep 26, 2022 By  GREFEE What are the processes of injection molding process? The plastic injection molding process mainly includes four stages, which are filling, pressure maintaining, cooling and mold releasing, which are an integrate and continual progress that directly affect the molding quality of products. Filling stage Filling is the first store of the whole injection molding process, which starts from the beginning of injection molding when the mold is clamped…

Quality issues and solutions of the TPR EVA

Quality issues and solutions of the TPR EVA plastic parts injection molding Posted on : Sep 30 , 2022 By  GREFEE There is an asymmetry between the quality of the molded TPR EVA parts and the qualified standard, due to which it cannot process promptly, which is the quality issue of the TPR EVA. To under the cause for these defects and minimize it to the lowest level, we should start from the following aspects: mold, raw materials, process parameters,…

Summary of properties of common plastic materials

Summary of properties of common plastic materials Posted on : Sep 23 , 2022 By  GREFEE  P S (polystyrene) Function of PS PS is a kind of amorphous polymer with good flowability and low water absorption (less than 00.2%), which is simple to form into clear plastic, of which the light transmittance is 88-92%. Its tinting strength and hardness are great. However, PS products are brittle and are easy to crack due to the internal stress. The thermal resistance is…

 Die casting technology for automobile aluminum alloy lower cylinder block

Key points analysis and defects management of Die Casting Technology for Automobile Aluminum alloy lower cylinder block Posted on :Aug 19 , 2022 By  GREFEE To achieve light weight vehicle, aluminum alloy material has been widely used in the automotive industry. The number of car parts made from die casting technology has been increasing. As the core part of automotive, a large proportion of material of the engine cylinder is aluminum alloy and casted iron.  Aluminum alloy die casting cylinder…

Solutions to common molding defects of injection molding

Solutions to common molding defects of injection molding Posted on : Aug 25 , 2022 By  GREFEE Defects are common when using molds to process plastic injection molding parts, and this largely affects the processing efficiency. The following are common molding defects and solutions for plastic injection mold parts. Short shots Short shots refer to the products made are incomplete due to the molds are not fully filled. This defect usually appears on the farthest spot away from the gate or…

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