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Analysis of cracking phenomenon of plastic screw bar and preventive measures

Analysis of cracking phenomenon of plastic screw bar and preventive measures Posted on : Dec 20 , 2022 By  GREFEE Cracking phenomenon of plastic screw column is a common plastic structure failure phenomenon. It is tricky to fix it as once the cracking occurred, it is hard to make up. What is the most tricky issue is the cracking is not to detected as easy as other defects of plastic parts as soon as the injection molding is completed. In…

Common Riveting Applications of Plastic Parts

Common Riveting Applications of Plastic Parts Posted on : Dec 3 , 2022 By  GREFEE For the riveting of plastic parts, the main body is plastic parts, and the connected parts include plastic parts, metal parts (such as metal sheets), electrical components (such as PCB boards), fabrics (such as mesh cloth), etc. The riveting does not require additional rivets or riveting posts and other accessories like metal riveting, but directly grows plastic structures  on the plastic body, such as columns…

Structural Design of Plastic Injection Parts – Wall Thickness

Structural Design of Plastic Injection Parts – Wall Thickness Posted on :Dec 21 , 2022 By  GREFEE Definition of wall thickness Wall thickness is a basic structural characteristic of plastic parts. If the outer surface of plastic parts is called the outer wall, the inner surface is called the inner wall, then there is a thickness value between outer and inner walls. The value is called the wall thickness. The value entered when the shell is extracted on the software…

Four things you need to know about ultrasonic welding

Four things you need to know about ultrasonic welding Posted on : Dec 1 , 2022 By  GREFEE Metal welding Welding: welding makes the two separated objects produce the binding force between atoms together by heating or compressing or both, rather than filling materials.There are a variety of them, which traditionally means the welding of metals. It has more than 40 types, which includes fusion welding, pressure welding and brazing according to the process of welding. 2. Pressure welding Under…

Punch System for High Vanuum die casting

Punch System for High Vacuum Die Casting Posted on :Dec 7 , 2022 By  GREFEE Vacuum die casting is the necessary technology for high quality aluminum die casting pieces, such as cylinder body, automatic transmission housing, valve body, etc, especially for automotive parts that require T6 Heat treatment and welding. The gas content of castings should be controlled within 0.5cc/100g, which has strictly requirement for high vacuum during mold filling (vacuum degree is below 50 mbar). It is difficult to…

Designing Elements and Process Flow of Die Casting Die

Designing Elements and Process Flow of Die Casting Die Posted on : : Nov 12 , 2022 By  GREFEE Die casting mold is the important process tool in die casting production. The metal fluid is cooled and cursed in the die casting mod and finally comes into the die casting parts. The shapes, sizes, quality and smoothness of die casting production of parts are all related to the die casting mold. Thus, the design of die Casting mold is essential.   1、 Basic…

How the position of gate affects the quality of injection molding products ?

How the position of gate affects the quality of injection molding products ? Posted on : Nov 16 , 2022 By  GREFEE Gates are essentials to the injection molding system and the types and sizes directly affect the quality of products and the costs. There are a wide variety of gates and the sizes of them are slightly different. Meanwhile, its characteristics and application status are different, too. The quality of parts are related to the shapes, sizes and feeding…

Waterproof and dust-proof for sheet metal motor cabinet

Waterproof and dust-proof for sheet metal motor cabinet Posted on :Nov 21 , 2022 By  GREFEE When planning these sheet motor cabinet of electronic devices, the planner should fully consider the protection of the cabinet according to its level of protection. Note: air ducts and structural joints are the main ways for water and dust to enter and reach the specified amount under any conditions. For instance, door seam, cable inlet and outlet, structural member joint, etc. Thus, these areas…

10 performance testing methods for plastic materials

10 performance testing methods for plastic materials Posted on :Nov 19 , 2022 By  GREFEE 10 performance testing methods for plastic materials 1. Ash test Ash: when the polymer is burnt at high temperature, a series of physical and chemical changes occur till the volatilization of organic components and inorganic components (mainly inorganic salts and oxides)left. The left components are called ash. Generally, ash in modified products means inorganic minerals, such as silica, calcium carbonate, talc, glass fiber, titanium dioxide,…

Unibody application in electronic product industry

Unibody application in electronic product industry Posted on : Nov 23 , 2022 By  GREFEE Unibody, also known as integrated molding or integrated body. Explanation for this principle is that one kind of mechanical operation technology that squeezes the aluminum alloy into board. Then, it is integrally formed by numerical control machine tool.  This is mainly for the metal material (especially for aluminum alloys), which can produce parts with integrated structural features by CNC machining. This part is full of…

LPIM over molding DFM report

LPIM over molding DFM report Posted on : Oct 21 , 2022 By  GREFEE Directory 1. The requirement of product 2. The analysis of the product feasibility and suggestion 2.1. demould direction for over molding 2.2. The question of A part I. Locating hole II. Thickness III.Tolerance of PCB. 2.3. The question of B part I. GAP II. Thickness III.Sharp edge to round IV.Tolerance of PCB V. undercut 2.4. The question of C part I. Plastic II. Thickness III.Sharp edge…

Analysis and Solution of Internal Stress of Injection Molded Parts

Analysis and Solution of Internal Stress of Injection Molded Parts Posted on : Oct 13 , 2022 By  GREFEE Stress refers to the force acting on the object per unit area, which emphasizes the stress condition inside the objects. Generally, under the action of external stress, the inside of object will produce stress to agents the external force. When the object is not subject to external force, the stress exist inside is called the internal stress, which is caused by the…

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