Industrial services

In the Name Of god


The company specializes in design and engineering (CAD), numerical analysis (FEM / CFD) and rapid prototyping.

The specialists of this company have started to work as the first specialists in this field in 2001 in Esra Company belonging to the Ministry of Defense (Rapid Prototyping) and in these 13 years the main suppliers of defense industries in this field in two forms, first Esra Company and then They have been Rana Knowledge Company.

In 2003, the company introduced the Thermojet device and launched the first practical printer that can be used in the military industry and started providing services.

Further specifications and information of Thermojet 3D printers are as follows.

In this method, the resin is sprayed on the work by heat from solid to liquid and then by 352 nozzles and are made layer by layer by moving the machine back and forth.

How it works is shown in the figure below:

The method is done in four stages of construction:
1- CAD preparing a 3D model computer file and converting an STL file
2- Submit preparing the file and presenting it to the device and setting it up
3- Build a piece
4- Remove Supports Cleaning and removing supports

Due to the significant advancement of technology, the company intends to introduce a new technology called SLS.
Selective Laser Sintering (SLS)
This technology is one of the most practical and powerful 3D printing methods in the world.
Introduction to SLS technology (rapid prototyping using powder materials)
Selective Laser Sintering (SLS) Selective Laser Sintering
The process of selective laser welding was introduced in 1989 at the School of Mechanical Engineering at the University of Texas at Austin and was registered with the American Patent Institute under two titles. The laser selectivity process is technologically similar to the streptoltography process, except that it uses powdered materials instead of liquid resin to make samples.
As the name implies, the heat generated by the laser energy is used to purify the powders of the materials.
First, a thin layer of material powder with a thickness of 200-200 um is spread by a roller on the surface of the machine platform. The laser used is a type of carbon dioxide with a nominal power of 50 watts. Due to the fact that polymeric materials have the ability to absorb high infrared rays and low melting point, with surface melting, the polymer particles become pasty and stick together. In fact, the sputtering mechanism in this case is the viscous flow.
After irradiating the laser light according to the STL file data on the surface of the particle powder bed in one layer, the device goes one step down and the powder loader moves one step up. The powder layering operation is repeated by rollers and the laser light radiation, in addition to spraying the powder particles in the new layer, also causes the layer to be connected to each other.

consuming materials:

A wide range of materials are used. The selected device uses polystyrene and crushed sand.


The most important applications of laser selective grinding process are applied models, precision casting wax production, mold mold production, precision casting and sand casting molds.
The advantages of the laser selective sintering process are:
Relative cheapness of consumables
Ability to use a wide range of materials
Economical and cost-effective (up to 50% cheaper than conventional machining methods).
The possibility of producing complex shapes and creating internal cooling systems These systems increase the cooling rate of the mold and increase the production speed by up to 50%).
Ability to produce parts continuously
No need to make molds in precision casting
The strength and flexibility of the sample made
Low distortion due to residual stresses
Making sand molds with very high accuracy

Reasons for using RP:

1- Accelerate the prototyping of parts with complex internal and external surfaces
2- Eliminating the need to design and manufacture models and muscles in casting, precision casting and machining parts
3- Accelerate prototyping for study:
Production capability
Ease of assembly
Ease of maintenance
4- Reduction of total design time to product production
5- Reducing R and D costs and production

Industries using RP technology

1- Military industry
2- Space industry
3- Aerospace industries (manufacturing some parts and creating aircraft models for testing in wind tunnels)
4- Automotive industries (complete car model, engine body, manifolds, etc.)
5- Medical engineering (designing and manufacturing special prostheses for each person, making three-dimensional anatomical models)
6- Tool making industries
7- Oil, gas, petrochemical, occasional power and … industries.

Recommendation of R and D designers and researchers to use RP technology

1- Doing design with the help of 3D CAD Model computer
2- Making a prototype of RP
3- Sample evaluation to find mistakes
4- Correction of errors and optimization of 3D CAD Model
5- Correction of the prototype made by RP technology
6- Optimization by making several samples with different designs
7- Making an optimized sample for performing performance tests, ease of assembly and maintenance
8- Performing FTM tests
9- After final approval with production ← confidence

Rapid prototyping process chain:

Although a variety of methods have been developed for rapid prototyping, all methods consist of the same five steps.
1. Preparation of data by design with the help of CAD computer
2. Convert CAD model to STL
3. STL file processing and preparation of information for construction
4. Making a control sample.
5. Secondary processes (finishing, cleaning and preparation)

Ready to provide consulting services for the purchase, use and commissioning of a variety of rapid prototyping systems (3D printers).
Hopefully, Danesh Bonyan Danesh Andish Rana Company (Private Joint Stock Company) can play an effective role in the growth and excellence of research, development and production in our dear country.