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Questions tagged [injection-molding]

15 questions
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How was this toy made?

This is a toy for infants. My son was playing with it, and I started wondering how you could manufacture this. I can't think of any reasonably cheap way it could be done. I believe it's made of plastic and not silicone. It's flexible, but not…
Drew
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Simulation modelling/ Digital twin of Injection molding process?

How can we make a digital twin of the Injection molding process in a production line? My idea is to do predictive maintenance and predict following downtime based on historical time series data of the Injection molding machine. Is Any Logic software…
Satya
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Improving O-Ring/flapper valve injection mold ->non-engineer

I make specialized flapper valves that are similar to O-Rings. The current model uses aluminum sheets as base disks that adhere to the rubber (2 part urethane). The rubber is poured into the waxed mold and then topped with an aluminum piece.…
Lilly Whelan
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Why does the cylinder/barrel on an injection moulding machine have such thick walls?

When you look at the cylinder on injection moulders, for instance on DIY ones on YouTube, they are all thick walled. The piston has say a 20mm diameter and the cylinder has like a 40mm diameter in which plastic is heated to 250C. Could you get away…
Lewis Kelsey
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Injection molding: What is best for a dual cavity single mold?

I would like to understand what's the best optimization in terms of design for a single mold, dual cavity of a two-part box (top and bottom parts) which should be hold together with 4 screws without any clip. For other reasons not drawn, both parts…
gregoiregentil
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Draft problem in injection molding

I have a design with two parts that would be produced via plastic injection (ABS injection molding). The two parts are small, around 10mm high each. I have drafted both parts (inside and outside, 2°) but because of some buttons that can't be moved,…
gregoiregentil
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Exploring End-use applications for motor oil containers

I am participating in a competition to identify viable new markets for approximately 2,000 tonnes of recycled HDPE collected annually from used oil containers. These include: 19-litre pails (injection molded) – 23% of the total 1-litre and 5-litre…
Kakashi
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What is the difference between torsional rigidity and torsional stiffness? Which would be better for comparing stiffness of two parts?

I am trying to compare the torsional stiffness of two injection moulded parts. I have applied torque to these parts and measured their resulting twist angle. I have plotted the data for both parts with torque (Nm) on the y-axis and twist angle (deg)…
golfplatz
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Injection molding - Probability of plastic pouring into connector

I have some metal pins that I want to be molded in parts of the final assembly. Meaning that, the mold will be made to accept those metal pins, which are positioned in the mold so that when the plastic is shot in, it will envelop the pins with…
user1584421
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Practical question on force in a molding application

I have a molding machine that is holding a spring loaded mold closed. The mold is basically two blocks of steel, but one half has a slide system that is pushed open by a number of gas springs. Those springs are oriented in the same direction of…
wenh12
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Mechanism for turning a thumbwheel potentiometer

I am trying to devise a method (3d printing or injection molding) in order to turn a potentiometer via a thumbwheel mechanism. Take a look at this picture, from an old commercial product that I am trying to replicate: The purpose of this mechanism…
user1584421
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Valox 420 30% glass wear

I am seeking assistance regarding thermoplastic material wear on a new product I am developing. The attached image is molded out of Valox 420 30% glass. In the left side image, the locking dents are worn off after 2000 rotational cycles, and the…
Rob Montgomery
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Is this shape possible with injection moulding?

I want to build a DIY case with the connector shown in the pictures below. As you can see, it consists of a circular plastic that extrudes from the main enclosure. Inside there is something that can be described as "cut_circle", that again…
user1584421
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Polymer material selection for injection molding

I'm trying to select injection moulding materials, and need some assistance to find the right products. I have a component that is made up 2 parts; an inner insert and an outer overmould. Originally this was only 1 part, but due to manufacturability…
Nunya
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Pneumatic cylinder extension rod preloading

I've been working on converting a 500Kg pneumatic press to use it for injection molding. In order to do that though I'd like to raise the cylinder up maybe 12". So I fabricated 4 5/8 CR rods and drilled/tapped m10 1.5 holes in the ends. (Same as…
Kurt Schaefer
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