Laser template
Laser steel mesh template is the most commonly used template in SMT steel mesh industry at present, and its characteristics are as follows:
The data file is directly used for production, which reduces the production error link;
The accuracy of SMT template opening position is extremely high: the overall error is ≤ 4 microns;
The opening of SMT template has geometric figures, which is beneficial to the printing and molding of solder paste.
The following information is needed to make laser steel mesh:
1, PCB 2, data file
Information must:
PCB: The version is correct, without deformation, damage or fracture;
Data file: weixin steel mesh (SMT template) processing group can accept various CAD data formats: Gerber, HPGL, *. Work, *. PCB，*。 GWK。 CWK。 PWK。 DXF。 PDF and the following software design data: PAD2000, POWERPCB, GCCAM4. 14、PROTEL、AUTOCADR 14(2000)、CLIENT98、CAW350W、V200 1 .
When the amount of data is too large, it should be compressed and transmitted, and any compression format such as *. Zipper, *. ARJ and *. LZH； can be used;
The data must include SMT solder paste layer (including fidelity mark data and PCB shape data) and character layer data, so as to check the front and back of the data, component types and so on.
Let's focus on the GERBER file;
GERBER file is a data format proposed by GERBER Company of America. It converts PCB information into electronic data that can be recognized by various optical plotters, also known as optical drawing files. GERBER file is a software structure with x, y coordinates and additional commands. The official scientific name of GERBER format is "RS274 format". It has become a standard format file in PCB industry.
The GERBER file is combined with the Aperture list (also known as D-Code) file to define the starting point, shape and size of the graph. The D code defines the size and shape of lines, holes, pads or other patterns in the circuit.
There are two types of GERBER files: RS274D and RS274X.
RS274D contains x and y data, but does not contain d code files;
RS274X contains x and y data, and the d code file is also defined in this file.
Electropolishing template
Electropolishing template is to improve the opening wall by electrochemical method after laser cutting.
Characterized in that:
1, smooth hole wall, especially suitable for ultra-fine pitch QFP/BGA/CSP.
2. Reduce the wiping times of SMT templates and greatly improve the work efficiency.
Electroforming template
In order to meet the requirements of short, small, light and thin electronic products, ultra-fine volume (such as 020 1) and ultra-dense spacing (such as BGA and CSP) are widely used. As a result, the SMT steel screen industry put forward higher requirements for printing templates, and electroforming templates came into being.
The electroforming template made by our company is characterized in that different thicknesses can be made on the same template.
Step template
Due to the different requirements of various components on the same PCB for the amount of solder paste, the thickness of some areas of the same SMT template is also different, which leads to the step-down &; Upgrade process template.
Step-down template
When welding a specific part, the template is locally thinned to reduce the amount of tin.
Bonding template
COB device has been fixed on PCB, but it needs welding process and bonding template.
Bonding template is to add a small cover to the PCB bonding position corresponding to the template to avoid COB devices and achieve the purpose of plane printing.
Nickel plating template (Ni. Template)
In order to reduce the friction between the solder paste and the hole wall, facilitate the demoulding and further improve the demoulding effect of the solder paste, at the beginning of 2004, Wei Innovation Company added a special post-treatment addition process-"nickel plating" on the basis of the traditional reduction process "electropolishing" template, and obtained a patent. Nickel plating template combines the advantages of laser template and electroforming template.
Etching template
Etched steel mesh is made of 30 1 steel plate imported from the United States. It is suitable for PCB printing with angular position and spacing greater than or equal to 0.4MM, suitable for copying and film use. It can use CAD/CAM and exposure mode at the same time, and can be scaled according to different parts without calculating the price according to the number of parts. The production time is fast. The price is cheaper than the laser template. It is convenient for customers to archive films.