TECHNOLOGIES USED BY AVI

MANUAL LAMINATION

The manual rolling technique is the simplest process for making parts from synthetic resins reinforced with fiberglass, being used for small series of parts. The advantages of this process are the relatively low cost of making the machines, the ease of their production, and on the other hand, special attention must be paid to implementation, because, being a process par excellence manual, requires a fairly specialized staff. Tools and various utensils are easy to procure, but as easy as this process seems, it is as difficult to obtain parts without the slightest surface defect.

SIMULTANEOUS PROJECTION

The simultaneous design process was developed as a result of the need to make parts with large surfaces in a short period of time. The main advantages are: automated mixing, with the help of simultaneous projection of the resin and the catalyst, as well as the controlled application of the entire set of materials: resins, catalyst and glass fibers. In addition to the above, the thickness of the piece is constant and the working staff does not need to be very specialized. Parts that can be used in almost all fields can be produced.

RTM – LIGHT

Also called vacuum injection, at low or high pressures, RTM (Resin Transfer Molding) is a technology that through its use has brought an extraordinary improvement in both the quality and cadence of production, compared to the process of manual rolling and simultaneous projection. Thus, a complete part can be made at an interval of up to 6-8 times smaller than the classic procedures, obtaining an increased productivity, motivated by the need to make medium or large series of parts.

The fiberglass is placed in the mold, taking the shape of it and implicitly of the piece to be obtained. A second mold (father) is then attached to the first (mother mold), and the resin is injected into the cavity thus obtained. A vacuum pump can be applied to force the full impregnation of the fiberglass fabric. Once the fabric is impregnated, the resin injection holes are closed and the part is left to cure. Both injection and polymerization can be done at room temperature and at higher temperatures, for example in the oven. Polyester, epoxy, vinyl ester and phenolic resins can generally be used.

The main advantages are obtaining parts with high fiber content with implicitly improved mechanical properties and reduced air gaps, good environmental control for both health and safety of operators, reductions in production costs for large parts with simple shapes. The main drawback is the high cost of equipment, the increased risk of marking on parts with gelcoat finish, unimpeded areas that can lead to scrap parts, all depending on staff training.

Typical applications are complex parts for the aviation and automotive industry, train seats, etc.

Nederman – vacuuming equipment

12 positions (braces, grinders, suction mouths, sweeping)

Power supply: 400 w

Frequency: 50hz

Power: 12.5kw

Current: 25.5 A

POLYURETHANE INJECTION

It is no coincidence that the raw material characteristic and indispensable of this process, polyurethane is referred to as “the material made to measure” due to its unlimited versatility. There is virtually no limit to the development of new products that can be made into a mold incorporating the polyurethane system. This system is used in the manufacture of sandwich panels used in the construction of industrial buildings, pipe insulation elements in heat distribution networks and various applications of rigid polyurethane foam as interior panels for cars and buses.

3-axis and 5-axis CNC

CNC – Numerical Control Center

Villa CMS Italy BR/3 2515

  • L = 2,5 m
  • l = 0,700 m
  • h =1,25 m
  • Compressed air 6 bar power
  • Electricity 380 v, 135 kw;
  • Water pressure 3 bar
  • Frequency 50 Hz
  • Current 210 A
  • Maximum operating temperature 500 ° C

WATER JET CUTTING

EASYLINE – water jet cutting

  • L = 4 m
  • l = 2 m
  • Three-axis hydroabrasive waterjet cutting robot with up to 2 x 4 m work range

ABKANT CNC

SPEED-BEND – Synchronized Hydraulic Press Brake

  • Bending capacity 160 tons
  • Maximum bending length 3100 mm
  • Distance between uprights 2550 mm
  • Lowering speed 100 mm / s
  • Bending speed 9 mm / s
  • Lifting speed 90 mm / s
  • Mono block, welded frame made of rigid steel at deviations and of high resistance with ST44 A1 material
  • 4-axis ( Y1 , Y2 , X , R)
  • 2 manually controlled axes (Z1, Z2)
  • High crosshead positioning accuracy – 0.01 mm provided by linear encoders

MIG / MAG AND TIG / WIG WELDING

MIG-MAG or inert metal gas-metal active gas

The technique is also known as argon welding, a gas that helps melt the metal bath and protects the entire structure obtained during welding. If you want to weld MIG, the technique comes from using an argon, an inert gas, while MAG is based on a mixture of carbon dioxide, which is active, and argon.

The differences between the two techniques, MIG and MAG, only apply to the gas you use. How is this gas chosen? Of course, the choice is made depending on the material you are welding, the steel requiring an active gas (MAG), while a material such as aluminum is welded using the MIG technique.

Compared to a classic electrode welding, the MIG-MAG process has the advantage of concentrating on an extremely small surface, thus greatly increasing productivity. If it is a robotic industry, such as the car industry, the MIG-MAG technique is ideal and extremely good results are obtained.

WIG-TIG – tungsten intert gas or tungsten inert gas

Both WIG and TIG are names that come from the type of gas used in the welding process, an inert type in both cases. Even if some people attest to the fact that WIG is a process for steel and TIG for aluminum, consider using both welding procedures in any case, there are more similarities than differences between them.

The heat required for welding is not provided by a flame, as in the case of a classic welding process, but by an electric arc. The entire welding machine produces the necessary electric arc, the additional material being introduced by means of a rod. Depending on the need for the add-on material, the rod has diameters between 1 and 3 mm thick, this being held in the other hand than the pistol for an optimal control of the quantity and the position of the add-on.

The process is not usual due to its cost-effectiveness, WIG-TIG welding being popular for surfaces where a very good finish is desired. Automotive, motorcycle frames or pressurized containers are the best examples to use WIG-TIG welding.

Dyeing


Composite materials are mixtures of different fibers bonded together by a curing resin. Depending on the application, composites may or may not require painting when new, but painting is a good way to restore or change color after the original finish is gone. The most effective method will depend on the type of materials of which it is composed. Before starting any painting project of this kind, it is best to check the manufacturer’s recommendations.