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21 03, 2019

90 degree elbow


How to design a 90 degree plastic elbow mold ? As shown above, this is a recent project of our company---90 degree plastic elbow mold. For plastic elbow molds, the core-pulling structure is essential. Our mold uses a collapsible core, which is determined by the structural characteristics of the product. Let's look down. Mold and parameters The picture above shows the overall appearance of the mold. The Mold size CI3540. How about it? It is like a big hammer. Slider and hydraulic cylinders to make it look very prominent . Take a look at some of its parameters: Part information Tool information Part name 220FSWP90 Standard DME Part NO: Type Two plate material PP+25%GF Cavity 1*1 Shrinkage rate 1.01 Insert steel H13(HRC48-52) Color Black Runner type cold runner Surface finish Cavity [...]

18 08, 2018

How to solve the weld line of injection molded parts


How to solve the weld line of injection molded parts Weld lines is an important factor affecting the quality of plastic parts.Under the same process conditions, the strength of the weld line area is only 10-92% of the original material, which seriously affects the normal use of the injection molded product. What is the weld line of injection molded parts The "welding lines" of plastic products means that the morphological structure and mechanical properties formed when two molten materials are in contact are completely different from the three-dimensional regions of other parts. There are two basic types of weld marks in injection molded parts: one is due to the structural characteristics of the plastic part or the size is large, in order to reduce the melt flow and filling time, when two or more gates are used, [...]

3 07, 2018

How to choose cold bending process of tubes


In which industries is the bend tubes used? Many industries use bend tubes technology.For example: boiler and pressure vessel industry, central air-conditioning manufacturing, automotive industry, aerospace industry, shipbuilding and other industries.The quality of the bend tubes pipe will directly affect the structural rationality, safety and reliability of the products in these industries.Therefore, in order to bend tubes high-quality pipe fittings, it is necessary to master the processing skills of the pipe fittings under different process conditions. For cold bends, it is necessary to properly select the core rod and master its correct use. How to choose cold bending process of tubes? In general, cold bends are available in two ways: one is a coreless bend and the other is a cored bend.Then the problem is coming.Under what circumstances do you use a coreless bends, when do you use a [...]

28 06, 2018

What is the Stacked injection mold


What is the Stacked injection mold Stacked injection molds are different from ordinary injection molds.It is a special mold structure. The stack injection mold has a plurality of parting surfaces, and each parting surface can have one or more cavities.Multiple cavities are arranged in a mold in the mold clamping direction.The lamination injection mould consists of a gating system, a die frame system, a cooling system, a bearing guiding positioning system, a two-way ejection system, and an opening and closing module linkage system. The basic structure of the Stacked injection mold Stacked injection mold consists of moving mold, middle mold and fixed mold. Multi-layer injection mold consists of moving mold, middle mold and fixed mold. fixed mold is located on the right side of the mold.It is fixed on the fixed plate of the injection molding machine. [...]

25 06, 2018

Large-scale injection mold design experience


About Large-scale injection mold In recent years, with the advancement of polymer technology, advanced manufacturing technology, computer-aided technology (CAD, CAM, and CAE) and other related technologies.Large-scale injection molds account for an increasing proportion of the entire mold output.Such as car bumpers, dashboards, TV housings, washing machine inner cylinders, TVs, air conditioning machine parts, tubs, barrels, turnover boxes and other large injection mold products. Due to the high cost of large injection molds. Therefore, the requirement of design and manufacture must be a success. Avoid rework. It is not allowed to be scrapped due to improper design. Large-scale injection mold design experience In terms of design, manufacturing, and injection molding technology, large molds are basically the same as ordinary injection molds.But large models have many unique features. Such as strength design, pouring system design, structural design, processing methods.In [...]

22 06, 2018

Mistakes in the design of Reinforced ribs


The effect of Reinforced ribs on plastic parts The non-exterior surface of the plastic parts where the strength and stiffness are the weakest. We should be design stiffeners. Not only improves the plastic parts of the forces, increase the strength and rigidity of the plastic parts. And save material. Stiffener can effectively overcome warpage. For plastic parts with thin walls and large areas, deformation will occur as a result of force. This will greatly affect the use of plastic parts. Stiffener help injection molding. Stiffeners are thick and have a large cross-sectional area. Place stiffeners where plastic parts are too weak. It can provide an excellent channel for the rapid flow of the melt. Mistakes in the design of Reinforced ribs The effect of reinforcing ribs on plastic parts. I don't think it's necessary [...]

20 06, 2018

Thin-Wall Plastic Parts


What is thin-wall plastic parts? About definitions of thin-wall plastic parts , it not only depends on Thickness of plastic parts,also depends on size of plastic parts and viscosity coefficient of plastic parts. Generally considered: 1. the ratio of flow length to thickness L/T, that is, the ratio of the flow length L from the point where the melt enters the mold to the farthest point of the cavity where the melt must be filled, and the ratio of the corresponding average wall thickness T is 100 or more. Thin wall injection molding; 2. the thickness of the molded part is less than 1 mm, and the projected area of the plastic part is more than 50 cm2. 3. the wall thickness of the molded part is less than 1 mm (or 1.5 mm), or t/d (plastic [...]

15 05, 2018

How to solve the difficulty of mold ejection in the injection molding process.


How to solve the difficulty of mold ejection in the injection molding process. After the plastic part is injection molded, the plastic part is taken out from the mold cavity.Whether using a single or multiple ejector mechanism, ejection is done in one go.However, sometimes it is difficult to fall off at one time due to the special shape of the plastic part.Can not meet the needs of production automation. However, adding another action affects the production efficiency of the plastic parts.So ejection system is an important part.The main reason for the difficulty of ejection is that the gate or plastic part is tightened in the mold.The reasons for this are: Num1: Equipment problem——Insufficient ejection. Num2: Mold aspect (1) The ejection structure is unreasonable or improperly positioned. (2) The draft is not enough. (3) Low mold temperature or poor ventilation. (4) The surface of the sprue wall [...]

17 02, 2017

Some things about injection mold you may don’t know


Seven hundred pounds of hardened stainless steel. That’s the average weight of an injection mold. Some can weigh over a ton, some just a few hundred pounds, but any way you slice it, you certainly wouldn’t want one to fall on your foot. So how do you get this massive piece of metal to produce intricate plastic parts? It’s all in the tooling. Using CNC EDM machines to create the base of the mold cavitations, it is the work of the tool maker to refine the steel to exact specifications. Precision work on the cavities is only part of the equation. The tool must also include gating to allow for proper melt flow and vents to allow gas and air to escape. Without the proper placement of these key features, parts will be subject to imperfections. If you are working with a turnkey plastic injection [...]

14 02, 2017

Automotive Injection Molding by Spark


What Kinds of Components Can Be Made from Automotive Injection Molding? Plastics are hugely popular in the automotive industry because they are lightweight, easily made and highly durable. With the introduction of plastics into the automotive industry decades ago, mass production was made simpler and much more cost efficient. The list of components made from automotive injection molding goes on and on. Essentially, if it’s plastic, it can be made by plastic injection molding. Here are a few examples of plastic parts and components made this way: - General instrumentation, including the molding that holds it all in place - Housings for electronic module controls - Radio controls - Plastic interior surfaces - Faceplates and lenses - Splash guards and other exterior automotive features What are SPARK’s Capabilities for Injection Molding for Automotive? Everything from under-the-hood components to the features you see throughout the interior [...]