pom-c vs pa-6

[Daniele-san]

Good morning.

I wanted to have a tip on the choice of injection molding material of a particular little visible but that must have:

low cost of material
high rigidity
high mechanical wear resistance
Low linear expansion coefficient
high temperature of softening


Thank you.

Hi.

 

[TECNOMODEL]

a pa6, pa66 or pa12 loaded glass or carbon meet your requirements, perhaps only the cost is a bit out.
depends on what you mean by low cost.

pom is also a valid choice, depends on how high the mechanical characteristics you ask.
with uploaded pa you get higher values, you could probably reduce thicknesses and save a little bit by decreasing weight.

 

[Meteor02]

request a little vague, to establish the type of technopolymer to use you have to consider more factors, exercise temp, presence of oils or hydrocarbons, thermal changes, needs autolubric, forces in play etc.
the only one is to present the project to those who will have to print it . the "loads" in the materials increase its dimensional stability but considerably increase its fragility and some (e.g. fiberglass) have also abrasive propitiancies.

 

[Daniele-san]

a pa6, pa66 or pa12 loaded glass or carbon meet your requirements, perhaps only the cost is a bit out.
depends on what you mean by low cost.

pom is also a valid choice, depends on how high the mechanical characteristics you ask.
with uploaded pa you get higher values, you could probably reduce thicknesses and save a little bit by decreasing weight.

is a particular one that supports hinged pedals with a steel pin properly fixed so that it can rotate
the pedal is stressed with a force of about 10/15kgf

 

[Daniele-san]

request a little vague, to establish the type of technopolymer to use you have to consider more factors, exercise temp, presence of oils or hydrocarbons, thermal changes, needs autolubric, forces in play etc.
the only one is to present the project to those who will have to print it . the "loads" in the materials increase its dimensional stability but considerably increase its fragility and some (e.g. fiberglass) have also abrasive propitiancies.

the particular is in the air and is not in contact with hydrocarbon lubricants etc.
is only in contact with the ambient humidity of the place where it is used
even if there is a pin in steel that is set on it and rotates for about 15° a/r it is not extremely necessary self-lubrication
We usually try our devices with climate cycles 22h -20 + 22h +50 80% rh to make sure that on the market they have no operating problems

 

[TECNOMODEL]

quoto meteor02, too few info x give accurate answers.

I started first of all from the questions he listed meteor, then I would begin to evaluate geometry, maybe even through fem.

Once you define the loads and forces at stake you can make the right choice.

 

[Meteor02]

Unfortunately it is all too vague to be of help, thicknesses, living edges of diameters, ribs all affect the resistance of materials, moreover 70° of heat escalation are several for a normal polymer (economic).
usually when needed high-performance (non-economic) technopolymers I address myself to http://lambda.lati.com/ Here you will find the technical cards of various materials (including those mentioned above) the only alternative to addressing your trusted printer is to study them and see what it does to your case according to the requirements you ask.
the best advice is always to use your trusted printer.

 

[Daniele-san]

Unfortunately it is all too vague to be of help, thicknesses, living edges of diameters, ribs all affect the resistance of materials, moreover 70° of heat escalation are several for a normal polymer (economic).
usually when needed high-performance (non-economic) technopolymers I address myself to http://lambda.lati.com/ Here you will find the technical cards of various materials (including those mentioned above) the only alternative to addressing your trusted printer is to study them and see what it does to your case according to the requirements you ask.
the best advice is always to use your trusted printer.

Unfortunately for obvious reasons I cannot post details which must still be presented on the market.
the moldist is indifferent to the use of the two materials, it is a choice that I would like to make a priori.
I know already, and correct me if I'm wrong, that the pom in addition to having a very high withdrawal rate compared to the average, has higher molding times due to its viscosity contrary to the pa6
thanks for the technical cards, from them I noticed that at the same standard test, the elasticity module at room temperature goes in favor of the pa6 but it degrades with the rise of temperature.

 

[Meteor02]

Keep in mind that freshly printed pa polyamides are particularly fragile and take elasticated ageing by absorbing wet from the air this involves storing pieces for months before using them or conditioning them artificially increasing costs. If you have as an objective also to break down the costs you have to make use of those who print the details otherwise risk making very counterproductive choices also from model 3d a printer can already anticipate the costs of the finished parisian. and maybe make you 2/3 hypotheses with materials of choice. However, polyamides generally have faster molding cycles than acetalics.