Tuesday 13 July 2010

Recreational Boats - Building of Fiberglass (composite)




      Is obtained :
  - manual laminar layers of fiberglass impregnated with polyester resin
  - combined and applied chopped fiber (polispray), the mold
  - vacuum bagging



 
Surface preparation

  1. First mold release wax applied in thin layers using a sponge and plain. Work the wax in small circles.
  2. The next step is the application layer demulant liquid, that is polyvinyl alcohol.
  3. After demulantul liquid dries, it can move towards gelcoat the mold., read more…….



Applying the mold gelcoat

  Highly recommended for execution pleasure boats gelcoat fiberglass is gelcoat isophthalic with neopentilglicol, it has a high hardness, very bright, high resistance to marine conditions and does not absorb water. Usually, it uses white pigment.
  Gelcoat is ready for use after adding the percentage of hardener (methyl ethyl ketone peroxide), read more………

Tips / Key Points

  Gelcoat be mixed before use (10 minutes to 24 hours). A low viscosity will cause excessive mixing, increasing the risk of flow and formation porosity.
  Gelcoat be mixed deep and surface, avoiding turbulence, read more……

Lamination

  The first layer consists of a reinforcement layer stratimat 300 g / mg powder. Be applied after the gelcoat has hardened layer (between 30 min. And an hour, but no more).
  Use a polyester resin tixotropizat general use, with the addition of hardener recommended. Do not mix more resin than you can use a period of 20 min.
  Resin applied over gelcoat spray strengthened by your age or with a brush, roller or lamb leather. Should apply a thick and smooth, if it can double in weight over ranfort. The first layer of resin and fiber moisten be pressed to follow the contour model without double layers, cuts or scratches.
  Then go to these three layers, only that here you use stratimat 450 g / mg. Stratimat combining the cuts from this layer and the following should be done with an overlap of 50 mm.
  Thus, the piece will have a total thickness of approx. 5.5 mm, and will have the following structure:
- gelcoat,
- one one mat 300 g / mg
- one three layers of matte 450 g / mg
- one one layer of fabric 500 g / mg
-one one layer of mat 300 g / mg, read more………
  Let the rod surface to dry in a day or two after mold that can be extracted.

Deburring or cleaning

  Deburing is execute with angular grinder. Trimming or deburring is performed with an angular grinder or other machine of its kind.
  All edges from cutting or grinding, must be applied by brush to have a layer of resin to cover the heads of fiberglass.






Wednesday 30 June 2010

   MAKING A MOLD   
     Fiberglass-reinforced polyester molds can be used for different / various manufacturing processes. The most widely used application is manufacturing pieces manually or with combined machines of chopping and applying fiber (polispray). In building a mould is important the experience of the one who works and it is recommended to choose the materials carefully which ensures the long-term quality of the mould.
Whatever of the application, the mould composed of two independent layers: surface  layer, structure or strength layer.

Surface layer gives the shape and the quality of the piece and, therefore, has a special importance/ significance.

The structure layer confers resistance and mechanical stability and varies according to the way the mould will be used
berglass-reinforced polyester moulds can be used for different / various manufacturing processes. The most widely used application is manufacturing pieces manually or with combined mach.


1. Construction model (Masters)    
  The first step in building the mold is making model. Parent or may be specially constructed wooden, plaster, metal or other materials that can not be attacked by styrene monomer. Model is to have good dimensional stability and surface quality must be at least as good as finished parts is desired.    Surface treatment includes waxing, sanding, varnishing and polishing , READ MORE .....................

 2. Application of matrix gelcoat 

   Gelcoat are created based on unsaturated polyester resins selected to achieve high HDT.This feature will allow a large number of pieces in the same mold. These gelcoaturi are ready for use after adding the percentage of hardener (methyl ethyl ketone peroxide) ,
READ MORE ........................

3.Tips 
   Using gelcoat matrix is required to obtain a faultless surface, glossy and durable.The operator must strictly monitor and control the application procedures. A large number of mistakes do not occur until after mold release and are caused by non-compliance of use,
 READ MORE ...........................
4. Laminate surface     
    The first layer is reinforced veil In an area, plus a layer of chopped fiber (stratimat) 300 gsm, powder.  Be applied immediately after the gelcoat has hardened layer well (from at least 3 hours and up to a maximum of 6 hours).
 READ MORE ...........................

5. Laminate strength and structure
Manually produced molds must be reinforced by additional rolling resistance layer and adding inserts. Alternatively, the matrix can be strengthened by making a rolling resistance layer sandwich, 
 READ MORE ..............

6. Insert and holders
    Inserts and support can not be applied until the surface layer did not dry for at least two weeks.
To reduce the risk of internal stress and dimensional change of the laminate, teaching or reinforcing elements of steel angles or similar sections must be assembled on the mold after having been preassembled, 

READ MORE ..............

 7. Removing mold from the model
    If the model surface is resistant to styrene monomer and if wax was carefully should not experience problems in removing the mold from the model. 

Connecting the compressed air ejector, mold can be removed from the model,  

 READ MORE ..............  
8. Materials needed
Gelcoat for molds, resin molds, general purpose resin, gelcoat for molds, peroxide M.E.C. (hardener)
 READ MORE ..............









    COMPOSITES MOLD MAKING 1



























Composites





































































































































Category:



Video composite

Tags:






COMPOSITES MOLD MAKING 2