custom Impeller & custom turbine CNC machining service

What are the steps of impeller & turbine processing?
The integral impeller is the core component of turbo engines and turbocharged engines. It is widely used in energy and power, aerospace, petrochemical, metallurgical and other industries. It really is a representative, standardized, and typical channel-like complex part. The processing methods, digesting precision and surface quality of its profile directly affect the aerodynamic performance and mechanical efficiency of the engine, and have a decisive influence on the engine overall performance. The integral impeller has become a typical difficult-to-machine component due to the complexity of its curved surface area and high machining accuracy. With the increasing demand for turbine engines in the market, it is increasingly necessary to achieve efficient machining of the essential impeller. Common materials for integral impellers include aluminum alloy, titanium alloy, and stainless steel.

Five-axis precision machining to custom impellers

The complexity of impeller processing mainly lies in the complex surface modeling of the blade. According to the forming principle, the surface can be divided into ruled surface area and non-rule surface, and ruled surface can be split into expandable ruled surface area and non-expandable ruled surface. surface. Five-axis CNC milling has good flexibility, high processing effectiveness and wide application. It is one of the commonly used methods for integral impeller processing. According to the different surface shapes of the impeller, two types of methods are usually used when digesting on CNC machine tools, namely point milling and side milling.

custom Impeller & custom turbine have extremely high CNC machining technology

Because the shape of the overall impeller is relatively complicated, the blades are twisted large, and the processing is very easy to interfere. Therefore, the difficulty of its processing is based on the rough and fine digesting of the runner and the blade. In the CNC machining of the essential impeller, in order to minimize the overcutting and interference caused by the tool, and the device can still have great rigidity when processing a narrow runner, a taper ball end mill is often used.

The error must be less than Ra0.8um

In order to make the impeller meet the requirements of aerodynamics, the blade often adopts a structure with a large twist angle and a rounded root, which puts forward higher requirements for the processing of the impeller. The technical requirements for integral impeller processing include geometrical requirements such as size, shape, position and surface roughness, as well as mechanical, physical and chemical efficiency requirements. Impeller blades must have good surface area quality. The precision is generally concentrated on the surface of the blade, the top of hub and the surface of the blade root, and the top roughness value should be significantly less than Ra0.8um.
In order to meet up with the above requirements, the essential impeller often encounters the following problems in the processing process:
①The flow channel of the integral impeller is fairly narrow, the blade is relatively long, and the rigidity is low. It is a thin-walled part, and it is easily deformed during the processing. During the machining process, due to its own structure and external cutting force, the inlet of the circulation channel and the upper end of the blade will produce vibration lines. Sometimes in order to avoid chattering, the sharpness of the tool is frequently changed, which in turn will cause burrs at the entrance, exit and blade edge of the runner. In order to ensure the surface quality of the entire impeller, it is necessary for the device to have enough rigidity, but also have enough space for chip removal and a suitable degree of sharpness.
②The blade depth at the narrowest part of the flow channel far exceeds the tool diameter, and the space between adjacent blades is extremely small. The tool diameter is small during corner cleaning, and the device is simple to break. The control of the cutting depth is also a key technology for processing.
③The curved surface of the integral impeller is a free-form surface area, the flow channel is narrow, the blade is more severely twisted, and there is an obvious backward tendency, which is easy to interfere during processing, and the processing is difficult. Because some impellers have auxiliary blades, to avoid interference, the curved surface must be processed in sections. Therefore, it is difficult to ensure the uniformity of the prepared surface.
④Considering that the overall impeller rotates at high speed in actual work, the velocity is 30000-50000 rpm, it's important to prevent vibration and reduce noise, so the requirements for dynamic balance are high, which raises the requirements for machine equipment and tools, and saves digesting beats , And ensure the smoothness and symmetry of trimming.

What are the actions of impeller processing

The fan impeller needs a very good processing process from the drawing to the actual product,
so as to ensure that the fan impeller can meet the standards and specifications, and the fan may operate normally.
Understanding the methods of impeller processing is also of great significance for us to understand the operation of the fan.

Motion trajectory calculation

The leaf pot and the back of the leaf are processed by the step-by-step method, and the processing motion trajectory calculation is based on the leaf pot and the trunk of the leaf respectively. The calculation process of the movement trajectory is as follows: First, the leaf back and leaf pot contour data extracted from the geometric model are used as the basic data for calculation.

Leaf root processing plan

The form of the leaf root is cylindrical, and the actual shape of the leaf root left after processing the leaf back and leaf pot by the stepwise method is related to the processing track of the leaf pot and leaf back and the form of the cathode. Based on the distribution characteristics of leaf root processing allowance after leaf pot and leaf back again processing.

Finishing of blade profile

If allowed by the component, tool and CAM software, side milling (huge axial depth of cut) will be the fastest option available. Our standard tapered ball nose end mill product line is specifically designed for this type of processing, providing excellent stability and accessibility. Impeller & turbine CNC machining service. The use of five-axis precision machining is usually TIKPRECISION's main CNC machining service.

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  • dummy Tik Precision Manufacturing Co.,Limited

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