plastic injection moulding material

[moretto]

Good evening,
are here to ask for help on the choice of mold material to print a particular polypropylene,
the details are shells of a water pump from gardening, they are quite voluminous,
about 340 x 345 x height of 755, I asked several quotes, some moulders made me a quotation for aluminum mold, others with steel mold, did not mention the type of steel, the cost goes from 85000 euros to more than 100000,
2 covers designed without trolleys, type open and close.production of 1000 pcs annual
I asked for a quote in china and tell me that they usually make these pati in abs using for the mold a 718h steel, they tell me that if I plan to use pp it is fine a p20
if I use pc+abs steel 1.2738h

What should I choose? p20 is it right for components for pp shells? extra ask as the component is big enough we have to use a hot runner with valves in sequence and ask yudo brand is okay for you?

do you know this brand, is it used in Europe?

I thank all those who will respond from now on.

 

[francescodue]

many years ago I designed pumps for ponds.
I normally used abs for the main details and pp for the so-called "tastes" that contained the real pump.
of course the details could be with loaded materials or not to improve mechanical performance.
said this, the details were then sent to the mold manufacturer for constructive and preventive evaluations.
the quantity to be produced can affect the material, and therefore on the price.
for low productions (the ones you have indicated) aluminum can be the best solution, especially if you have no movements or other criticalities, for a matter of cost.
for the type of steel to use, I never worried about it: once you have established the price and life you have to have the particular, it is up to the molder to worry about this.
if your need is to produce only 1000pz in a year and then just enough, aluminum is the best choice.
if you expect to make 1000 every year for 5 years, it would still be optimal. personally I had to deal with a particular (about half of your size) that remained in production for 15 years without problems.
if you expect to increase the quantities, or the particular final has many critical details, you should bet on a steel mold.
I have always entrusted myself to the experience of the moulder: in the end the maintenance of the mould is, normally, at its expense. Moreover the faulty pieces are rendered and unpaid, so it risks working for nothing.
two notes: I worked with some Chinese manufacturers.
If you're pointing at the price, you're likely to throw away the money.
if you have a studio that does as a bridge, the quality is good and the cost is quite affordable.
If you want quality, the cost is not different to make them in Italy.
Finally, the transport of voluminous objects has an important cost. evaluate if it is inserted somehow in the cost of the mold.

 

[moretto]

good evening francescodue the quantity for the moment is 1000 pcs annual, all our details remain in production for about 10-15 years then depends on how they will be evaluated by the market,
I usually use local moldists, but this time I wanted to ask for a quote also in china, the price must be different, they pay: steel, labor, general costs, gas etc less than we, I wanted some information about the type of steel I mentioned above.

 

[Il_Dada]

good morning mooring, p20, 718h and 1.2738 are substantially equal, all steels that are supplied pre-recognized, maintained to that state without treatments for applications without big claims or for low stretches with un aggressive materials. The choice of aluminium is a good solution. yudo is one of the most well-known and largest suppliers of hot-channel injection systems and among those economically more competitive. if you go to the cina you will be proposed nothing but yudo unless you have specific requests.

 

[moretto]

thank you for the information,
I wanted to ask you that aluminum is used in injection molds?
I saw you're a mold designer, could you take a look at the drawing and quotes? to know if they're congruous.
If you need advice or design of the molds, (paying of course) would you have a chance to help me?

 

[Il_Dada]

Good night.
No problem. the most use alumino and ergal alloys, common and available. if you want some extra warranty in terms of polishability and toughness, especially in relation to the material to be printed usually for injection molds you use the weldural. If you want me to look at him, there's no problem.

 

[df2001.98]

good evening francescodue the quantity for the moment is 1000 pcs annual, all our details remain in production for about 10-15 years then depends on how they will be evaluated by the market,
I usually use local moldists, but this time I wanted to ask for a quote also in china, the price must be different, they pay: steel, labor, general costs, gas etc less than we, I wanted some information about the type of steel I mentioned above.

try to hear also the technical mold of altivole (tv). for my experience, on aluminum molds is practically unbeatable.

Stampotecnica - stampi ad iniezione per materie plastiche

Stampotecnica, con sede ad Altivole (Treviso), è un'azienda leader nella progettazione e produzione di stampi ad iniezione per materie plastiche.

www.stampotecnica.tv.it

 

[Meteor02]

Good evening,
are here to ask for help on the choice of mold material to print a particular polypropylene,
the details are shells of a water pump from gardening, they are quite voluminous,
about 340 x 345 x height of 755, I asked several quotes, some moulders made me a quotation for aluminum mold, others with steel mold, did not mention the type of steel, the cost goes from 85000 euros to more than 100000,
2 covers designed without trolleys, type open and close.production of 1000 pcs annual
I asked for a quote in china and tell me that they usually make these pati in abs using for the mold a 718h steel, they tell me that if I plan to use pp it is fine a p20
if I use pc+abs steel 1.2738h

What should I choose? p20 is it right for components for pp shells? extra ask as the component is big enough we have to use a hot runner with valves in sequence and ask yudo brand is okay for you?

do you know this brand, is it used in Europe?

I thank all those who will respond from now on.

on a closed open mold that pp printing is usually used avio/ergal aluminum you do not have problems up to 30/50k pieces and if some small bava is tolerated you can safely go ahead without maintenance. with the Chinese I have had good and bad experiences if you don't have a supplier more than known lets stay, yudo in Europe is used on molds made in wool and when they urgently serve exchanges are pains.

 

[Il_Dada]

Answer

... yudo in Europe is used on moulds made of wool and when they urgently serve spare parts are pains.

It's not like that.
in Europe it is used as any other supplier of hot channel systems, in cina it is simply the most used but yudo cina often uses different codings and components which complicates life when serving exchanges on molds made in cina and then imported. ;-)

 

[moretto]

good evening meteor02 you can give me more information about your experiences, good and bad,
time ago I was very pessimistic about the products made in china, but if I look around,
Many products are now made in china, they don't seem bad realized, I have friends working in china and sometimes they do me material research, I sent him the 3d to do a search for moldists, but they also ask me the 2d file with tolerances, I hoped it would be enough the 3d, usually I realize the 2d in dwg only for mechanical parts, for the famines usually send only the 3d.

 

[Meteor02]

good evening meteor02 you can give me more information about your experiences, good and bad,
time ago I was very pessimistic about the products made in china, but if I look around,
Many products are now made in china, they don't seem bad realized, I have friends working in china and sometimes they do me material research, I sent him the 3d to do a search for moldists, but they also ask me the 2d file with tolerances, I hoped it would be enough the 3d, usually I realize the 2d in dwg only for mechanical parts, for the famines usually send only the 3d.

good experiences, discreet cheap molds with few adjustment jobs have been working for years with nothing to envy to molds made in eu. bad experiences have arrived me dies not usable, with expensive accommodation jobs one of these was scraped and remade on site. in cina there are very serious companies of construction molds one of these is ace mould but if you turn to this type of companies the saving is relative goes from a max of 30% if you use the normalized made in cina to a 10% if you want all normalized made in eu. I turn out to be the demand of the 2d unless they want the project mold. if you decide to make the mold in wool ask all the mathematicians of the mold project there companies with 2000 employees close in 3 days and if after a while you have to make changes are pains. If you want a mold and mold listing please contact me in private.