New mould design?

[Kinish]

I am trying to redesign a mould for making rubber to AL bonded parts in a press.
Does anyone have any useful links to help?
Is it possible to inject mould rubber?

 

[btrueblood]

Find a local company that does compression or transfer molding of rubber, and talk to them.

 

[patprimmer]

True rubber is normally compression or transfer moulded.

Many elastomers or "synthetic rubbers" can be injection moulded

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[bright81]

hey, there are a lots of rubber material as soft and hard. you must be knowing what is hardness of rubber you need.

Bright
Sr.Project Manager&GM
HT-MOLDS

http://www.ht-molds.com

 

[deper]

Knish,

To answer your 2nd question, yes you can injection mold rubber although it is not done very often in an overmolding application. I would go with compression if the design allows for it.

 

[kenvlach]

Presumably you want good adhesion. Rubber does not adhere well to aluminum, which is one reason most tire molds are aluminum.

For good adhesion of rubber to aluminum parts, the aluminum is usually copper plated.
This is also true for steel, e.g., wire used in the tire bead is " usually coated with Bronze (Cu : Sn) or Brass Coating (Cu: Zn) for achieving adhesion with rubber." --

http://en.wikipedia.org/wiki/Tire_manufacturing

Another technique is to roughen the aluminum surface and use a bonding agent. See
Improve Adhesion to Aluminum Extrusion
thread367-125777
& 'Chemlok Rubber-to-Substrate Adhesives' at

http://www.lord.com/tabid/3261/Default.aspx

Suitable adhesive is available for coating the metal insert prior to molding the rubber.