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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 the design process, [...]

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 [...]

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 part thickness [...]

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 [...]

11 02, 2017

How much do you learn custom silicone rubber?

Custom silicone rubber is often used in many automotive, appliance, electronic, and aerospace applications where resistance to temperature extremes are necessary. Silicone Rubber has a lower tensile strength than most other polymer/elastomers. Solvents, concentrated acids and oils tend to break it down. Use of Silicone Rubber where extreme temperature resistance is not essential is discouraged because of cost. Spark Rubber Molding Increases Large Part Rubber Molding Capability Spark increased capacity and large part capabilities with the addition of two new hydraulic presses for transfer molding and compression molding. With platen sizes of 48" x 56" and 42" x 42" with 36" rams, Spark Custom Rubber Molding is positioned to meet all of their customer's transfer and compression molding needs. Spark Custom Rubber Molding creates quality custom rubber compression molding, custom transfer molding, custom rubber injection molding and rubber to metal bonding with the highest standards in [...]

8 02, 2017

A Focus on plastic injection molding

Two common defects caused by issues with the resin or resin additives used during injection molding are delamination and discoloration. Delamination Delamination, when a finished part has a layer of flaky material at the surface, hurts both aesthetic of your part and its strength. Caused by moisture contamination of the resin pellets or by other contamination of the melted resin with a dissimilar resin, or by release agents in the mold, delamination is the result of the resin being prevented from bonding. A number of methods, both simple and more complex, can be used to prevent delamination. If moisture is the issue, pre-drying the resin pellets or increasing mold temperature will help. If mold release agents are the cause, a mold redesign that places more focus on the ejection mechanism will help to eliminate mold release. If it is caused by cross-contaminated resins, that will [...]

23 01, 2017

How to make metal casting molds?(2)

Here I continue to introduce the process of manufacturing metal casting molds. Cutting the Gates Using a piece of sheet metal bent into a 1/2-inch-wide U shape, cut a channel, or gate, running from the casting cavity to the riser position. Lift out a bit of sand at a time, forming a gate slightly smaller than the diameter of the riser and slightly shallower than the depth of the casting cavity. Scoop out a similar gate from the casting cavity to the sprue position. For large molds, cut several gates to the sprue and the riser from various parts of the casting cavity. Blow out or tamp down any loose bits of sand in the gates. Refining the Mold Rebuild crumbled sections of the casting cavity by adding bits of moist sand, smoothing it into place with molding tools. Tamp down or blow away all [...]