Solutions for a Wide Range of Technologies

Chemograf is an expert in:

Photo Chemical Machining (PCM)

Chemical Machining (PCM) is an important process in the production of precise parts, mainly sheets and foils.
Coating the metal sheet with photoresist sensitizes it. When this sensitized metal is put into the double-sided Photo-tools and is subsequently exposed to UV light on both sides, an image is formed in the photoresist layer; it is then developed in a liquid formulation to form an adherent durable image on both sides of the metal.

Various methods exist for the production of Photo-tools. The most commonly used method is to produce a Photo-tool of the correct size by using a laser photo-plotter to selectively expose a photographic film according to computer-aided design data. Photoresists are polymers that are sensitive to UV illumination. The etching is performed by an acid cocktail that attacks the surface of the raw material on both sides. Before coating the metal with photoresist, the metal is thoroughly cleaned to remove all dirt, rust, greases and oils so that a good adhesion to the photoresist is obtained. The final stage of the PCM process is to strip off the resist and ensure that the metal is clean and the requested dimensional specifications have been fulfilled .

The PCM process enables the production of parts with complex geometric shapes, without necessitating large tooling costs for small prototype runs. Chemograf produces metal parts in thicknesses ranging from 0.01 mm (0.0004”) to 1.5 mm (0.06”) in a wide selection of materials.

Advantages of Photo Chemical Machining
Low-cost tooling
Quick delivery
Retention of mechanical properties
Step – and – repeat of design
Tooling changes at a minimum cost
Burr-free parts
Excellent for complex geometric shapes
Excellent for small prototype runs

Photo Chemical Machining Technical Details:
Part Size: 0.5mm to 600mmX800mm
Thickness of Material: (0.01mm-1.5mm) .0004″- .060″
Tolerance: 10%T not less than +-0.02 mm

Micro Laser Technologies

Chemograf have the capabilities of Micro Laser Technology production.

This technology is suitable for producing a wide range of top quality, high precision, thin, complex miniature parts that are made of a wide variety of steels and SMT stencils, for the assembly of PCB’s by screen-printing processes.

We offer our customers exceptional field-proven qualities by using the most up-to-date technology.

Chemograf’s Micro Laser equipment includes a 15 microns laser beam with accuracy of 0.01 microns, and two 30 microns laser beams with accuracy of 0.005 mm. This equipment enables us to produce Conic Holes and provides very straight and smooth cutting lines with no appearance of burns while maintaining great accuracy and uniformity.

Chemograf ‘s extensive use of these state of the art systems offers a very high quality fine cutting lines with very fine-pitched geometries and micron-sized holes. Micro laser is suitable for rapid turnaround of small batches which fits perfectly for producing samples. It is also an ideal method for meeting the stringent requirements for producing medical implants.

Worksheet size – 600mmX600 mm
Accuracy – 0.005mm – 0.03mm

High Speed CNC Milling

Chemograf offers a state of the art machining center to meet all of your demands for high accuracy parts with complex geometries from all kinds of metals, including: Stainless Steel, Aluminium, Copper & Copper Alloys, Alumina, Laminate Sheets, various kinds of plastics, Silicon, etc.

Chemograf’s machining center provides up to 120k RPM by ceramic bearings.

Worksheet size – 400mmX600 mm
Max tool diameter – 4mm.
Accuracy – 0.005 mm

Laser Welding

Laser welding is a welding technique used to join multiple pieces of metal through the use of a laser. Chemograf’s equipment provides a concentrated heat source, allowing for narrow, deep welds and high welding rates. We use this process in a wide variety of applications, such as in the Aerospace, Medical & Surgical, Automotive and Electronic Industries.

Laser welding has high-power density, resulting in small heat-affected zones and high heating and cooling rates. The spot size of the laser can vary between 0.2 – 0.4 mm. The depth of penetration is proportional to the amount of power supplied, but is also dependent on the location of the focal point: penetration is maximized when the focal point is slightly below the surface of the working piece.

Chemograf is capable of welding Carbon Steels, Stainless Steels and Nickel Alloys, Aluminum, Titanium , Copper, Miu Metal and more. Using Chemograf’s equipment results in very high quality welds.

Bending & Stamping Technologies

Stamping (also known as pressing) is the process of placing flat sheet metal or plastic after Micro Laser or Photo Chemical cutting, in either blank or coil form into a Stamping Press where a tool and die surface forms the metal or plastic into a net shape. Chemograf uses several methods of Stamping including a variety of sheet-metal forming manufacturing processes, such as:

Punching– using machine presses or Stamping presses.

Bending– using CNC Press Brake machines. This could be a single stage operation where every stroke of the press produces the desired form on the sheet metal part, or could occur through a series of stages. The process is usually carried out on sheet metal, but can also be used on other materials, such as polystyrene, FR4, laminate seat etc.

Die cutting– this is the process of using a die to share materials, such as sheet metal, rubber foils, plastic and foam.

Deep drawing– this is a sheet metal forming process in which a blank sheet metal is radially drawn into a forming die by the mechanical action of a punch; It is thus a shape transformation process with material retention. The flange region (a sheet metal in the die shoulder area) experiences a radial drawing stress and a tangential compressive stress due to the material retention property.