To create a machine, device, or production line, several stages must be completed. First is the design concept ⇒ Assembly drawing (in 2D or 3D) ⇒ Create detailed drawings (also referred to as detailed Barashi) ⇒ Machining ⇒ Assembly ⇒ Inspection ⇒ Packaging ⇒ Commissioning.
The design team at IDEA is performing Barashi tasks
The process of extracting details from a 2D or 3D assembly drawing into a new drawing frame involves fully specifying dimensions, tolerances, processing, symbols, etc., into a complete detailed drawing. This process is called detailed Barashi, often abbreviated to Barashi.
Thus, the Barashi task is critical. It is viewed as detailed design. The detailed drawing after Barashi will be sent for machining. The quality, precision, and functionality of the part heavily depend on the accuracy of the detailed drawing. For instance:
*Material of the parts: The most commonly used materials include carbon steel, SUS, aluminum alloys (collectively referred to as aluminum materials), and various plastics such as POM, MC Nylon, PET, and others.
Before undertaking any task for a specific order, the first step is to thoroughly read the standards and understand the entire content within the customer’s specifications.
Barashi requires a drawing frame. If a drawing frame is not available before Barashi, you must request this from the project manager.
For 3D design software like SolidWorks, Inventor, Catia, Creo, changing the drawing frame or scale will result in automatic updates, which is quite convenient, as properties will also adjust accordingly.
In contrast, with 2D design software like AutoCAD, Icad, BricsCAD, changes to the drawing or scale will not update automatically (unless certain modules are installed). You must replace some properties manually, which requires special attention. When changes are made, all properties must align with the current drawing frame.
Each customer often has specific layer regulations that must be adhered to during work. Typically, for 3D design software, layers are set. During Barashi, they will update automatically as long as the correct customer template is used. However, for 2D design software, compliance with the client’s layer regulations is essential.
Layer standards will vary per order, depending on the customer. Generally, the following types of layers exist:
Note: In Icad, line thickness is categorized into three types: thick, medium, and thin. In the absence of customer specifications, we should use only the medium and thin types. The medium thickness is used for outer contours, while the thin thickness is used for everything else.
*Projection Angles: Unlike Vietnamese standards, projection angles following JIS standards originate from the third projection point.
*View Layout in Drawings
Priority order from ① to ⑤. Generally, in Barashi drawings, including assembly drawings, views are mainly arranged according to ① and ② (Primary view ①, top view, right side view). In addition to the layout rules shown in the image, there are also layout standards like:
When placing views on a drawing, choose accordingly based on the specific case. The drawing produced must be easy to read, clear, and avoid confusion.
*View Layout Rules for Basic Parts
Cylindrical components should be arranged horizontally, with the most processed side on the right (arranged according to machining rules).
Long-shaped parts should also be laid out horizontally.
*Other Types of Components.
Frame: Layout should follow the actual working direction, with the bottom part representing the ground.
Bracket and bending sheet
*Basic Standards
In the next section, I will guide you through the detailed steps to perform Barashi. I hope everyone will continue to follow along.
IDEA is one of the leading companies in Vietnam in the fields of design, precision machining, machinery manufacturing and automation solutions. With a team of over 195 talented and experienced engineers working according to high technical standards, IDEA provides innovative and efficient solutions that enhance performance and optimize costs for customers. The group is expanding its market share internationally, affirming its position as a trusted partner of major companies from Japan, the U.S., Canada, and many other countries.
