Development Trend of Propeller Casting Method - PTJ Blog

CNC Machining Services china

Development Trend of Propeller Casting Method


Development Trend of Propeller Casting Method

Large propellers are produced almost all over the world in the form of a scraper. In the production of variable-pitch ship propellers, after scraping off the equal-pitch surface with a scraper, the auxiliary pitch plate is also used to scrape the variable-pitch surface

Development Trend of Propeller Casting Method
Development Trend of Propeller Casting Method

1. Modeling Method

In the 1960s, pit shapes were generally used when casting large propellers in various countries. Later, through production practice, it was found that when the driving height is sufficient, the ground shape is convenient, so they have changed to ground shape.

The types of foundry sand vary from manufacturer to manufacturer. In general, there are cement sand or CO2 water glass sand. The former is cheap, the latter has a short hardening time, and both can guarantee product quality.

At home and abroad, large-scale propellers are produced by means of scraper modeling. In the production of variable-pitch propellers, after scraping off the equal-pitch surface with a scraper, the variable-pitch surface is also scraped with an auxiliary pitch plate. Use a cross-section template to make a fake blade. There are two methods of the model: one is a fish belly shape, which is placed according to its radius; the other is a linear shape, which is placed according to rectangular coordinates. 

The former can be made only by using a scale according to the figure, and the latter can be made only after conversion by an electronic computer. The superiority of the linear model separation modeling method is not obvious, but it adds a lot of conversion procedures, and it does not substantially improve the product quality.

Usually, hot air is used to dry the inner cavity of the casting. The hot air blower is mobile or fixed.

2.Casting System

The pouring system is an important part to ensure the casting quality of the product. During the machining castings process, oxide slag is often mixed into the liquid metal. Especially when turbulence or vortex is generated, slag inclusions will be generated in the central area of the vortex. 

Therefore, careful consideration should be given when designing the casting system to minimize the possibility of slag inclusion. There is information to introduce a filter in the casting system. The filter screen was first made of molding sand, and later it was made of iron plate drilling. However, after many years of trials in our country, the effect is not good. Because when there is a filter, the liquid metal enters the casting system and is sprayed by the filter, which increases the chance of metal oxidation and significantly increases the oxide slag.

3. Riser

At present, there are people using insulation risers in China. If hot molten steel can be used for supplementary pouring, the supplementary effect of the riser can be brought into full play.

4. Casting Retention

The densest part of the casting is on the surface of the metal.

Link to this article:  Development Trend of Propeller Casting Method

Reprint Statement: If there are no special instructions, all articles on this site are original. Please indicate the source for reprinting:,thanks!

cnc machining shopPTJ® provides a full range of Custom Precision cnc machining china services.ISO 9001:2015 &AS-9100 certified. 3, 4 and 5-axis rapid precision CNC machining services including milling, turning to customer specifications,Capable of metal & plastic machined parts with +/-0.005 mm tolerance.Secondary services include CNC and conventional grinding, drilling,die casting,sheet metal and stamping.Providing prototypes, full production runs, technical support and full inspection.Serves the automotiveaerospace, mold&fixture,led lighting,medical,bicycle, and consumer electronics industries. On-time delivery.Tell us a little about your project’s budget and expected delivery time. We will strategize with you to provide the most cost-effective services to help you reach your target,Welcome to Contact us ( ) directly for your new project.

Reply Within 24 Hours

Hotline:+86-769-88033280 E-mail:

Please place file(s) for transfer in the same folder and ZIP or RAR before attaching. Larger attachments can take a few minutes to transfer depending on your local internet speed :) For attachments over 20MB, click  WeTransfer and send to

Once all fields are filled in you will be able to send your message/file :)