After the completion of the design stage, those products are examined in terms of production
methods, and necessary innovations which facilitate their processing/ molding are applied.
Then, production drawings are created for mass production.
At this step, problems which may prevent production, may cause dimensional inconsistencies,
deterioration of visual appearance, and thus delay of the product’s market launch or drop of product
desirability by the customers are detected and solved in advance.
Thanks to our design engineering team that have manufacturing experience, we help you to bring
your product into the market faster.
Moldability and Producibility Analysis
This phase consists of simulations and revisions made to produce the product more conveniently and
cost-effectively after its 3D detailing is complete.
Moldability is particularly important in all steps starting from concept development for the parts that
will be molded with plastic injection.
To give an example, a deep grain added onto the surface of the plastic part to improve the visual
effect may complicate demolding / ejection (Figure 1).
Figure 1 - The grain that makes the demolding process difficult and insufficient draft angle
Or a wall that exceeds the overall wall-thickness in design may cause sink marks on the “A surface” of
the product (Figure 2).
Figure 2 - Possible sink area
Another example is that the parting surfaces steepened due to part geometry might prevent molding
by colliding with or scraping against each other.
Figure 3 - Draft angles and vertical parting surfaces
As Tulga, we improve the 3D design before mold production in order to prevent such problems and
more by examining draft angles, undercuts, parting line, sliders, areas where slider marks are
acceptable, and sections that have problematic wall thicknesses which might prevent or slow down
For the parts that will be produced by machining or other methods, we improve the mechanical
design by checking the minimum radius, groove / pocket width, wall thickness and many other
Analysis / Simulation
The quality of the molded piece is directly affected by production conditions. For example, the
number of short-shots (Fig. 4) and sink marks increases in a part which is injected under low pressure
while chemical degradation occurs in parts injected under high temperature.
Various input are entered into computer and the process is previewed in order to identify similar
problems that may occur during serial molding. So, it is determined whether the injection conditions
are within the optimum process window (Figure 5).
Figure 5 - Plastic injection process window
During simulation, several variables such as runner sizes, gate locations, filling simulation, filling time,
cooling time, cycle time, injection time, air gaps, warpage, weld line locations, injection pressure,
packing / holding pressure, injection temperature, cooling performance and many other critical
variables are determined in advance with molding analysis software, and necessary improvements
Creating Production Drawings
In order to produce and assemble the product after the design process, technical drawings are
created according to the production methods.
Technical drawing is based on an objective common language between engineers and
manufacturers. You can have various parts produced in different parts of the world, and you can still
easily assemble them thanks to the production drawings prepared perfectly.
Creating accurate production drawings requires serious experience in production.
On the other hand, production drawings do not only consist of dimensioned 3 orthographic views. It
should also contain engineering specifications such as partial or full sections, tolerances of form and
location, dimensional tolerances, surface treatment marks, and surface roughness values etc.
We can prepare 2D drafting in AISI, ISO or DIN standards according to our customers’ request. If the
product is composed of an assembly group, we prepare the drawings of the parts and assembly
separately. We create the manufacturing drawings of the parts in ISO-E standards unless otherwise
Tulga creates manufacturing drawings in accordance with TS2040, TS 1980, TS10849, TS11397,
TS6700, TS7015, and TS10841 standards.