Products Description
The CNC manufacturing pulley for helicopter handling products is a high-performance, high-reliability, critical component designed specifically for heavy-duty helicopter lifting, rescue, and external handling operations. Typically integrated into sling systems, this pulley is used to redirect the cable, transfer loads, and optimize force distribution. Its core feature lies in its use of advanced CNC machining technology, which ensures extremely high dimensional accuracy, geometric consistency, and superior surface finish. This enables the pulley to minimize cable wear and ensure operational safety even when subjected to extreme dynamic loads and harsh environments. The product undergoes rigorous finite element analysis and non-destructive testing to meet the stringent aviation requirements for weight, strength, and safety.
Production Process:
- Raw Material Preparation and Cutting: Based on process requirements, aluminum alloy or alloy steel billets of selected specifications are cut using a band saw or CNC flame/plasma cutting machine.
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CNC Machining:
Turning: Rough and finish machining is performed on CNC lathes to form the pulley's outer diameter, hub, V-groove, and other key contours, strictly controlling the groove angle and radius.
Milling: Precision milling of bolt holes, weight reduction cavities, and mounting interfaces on the hub is performed on vertical or horizontal machining centers.
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Heat Treatment: Alloy steels undergo quenching and tempering to achieve high strength and toughness. Aluminum alloys undergo solution treatment and aging to enhance mechanical properties.
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Surface Treatment: Depending on the material and application environment, appropriate surface treatments, such as hard anodizing or electroless nickel plating, are applied to enhance wear and corrosion resistance.
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Quality Inspection and Testing: Critical dimensions are fully inspected using a coordinate measuring machine, and internal defects are detected using eddy current or ultrasonic testing. Finally, static load and fatigue tests are carried out to verify its load-bearing capacity and service life.
Product Process
This product mainly adopts CNC milling, and its bearing hole accuracy reaches 0.002mm. Every step is carefully crafted, and the arc chamfer is close to perfect.
The pulley surface is black anodized and laser engraved with the LOGO.
Material properties
Material Analysis (6061 Aluminum Alloy)
The 6061 aluminum alloy used in this product is a heat-treatable, hardened Al-Mg-Si alloy. Its chemical composition conforms to ASTM B209. The main elements are: Si 0.4-0.8%, Fe ≤0.7%, Cu 0.15-0.4%, Mn ≤0.15%, Mg 0.8-1.2%, Cr 0.04-0.35%, Zn ≤0.25%, Ti ≤0.15%, with the balance being Al. This material offers the following key advantages.
Excellent mechanical properties
After T6 heat treatment, the tensile strength is ≥310MPa, the yield strength is ≥276MPa, and the elongation is ≥10%. It not only meets the high-strength load-bearing requirements during helicopter transportation, but also has a certain plasticity to avoid the risk of brittle fracture.
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Lightweight characteristics
The density is only 2.7g/cm³, which is much lower than that of steel (7.85g/cm³). While ensuring strength, it can significantly reduce the pulley's own weight (about 65% weight reduction compared to steel pulleys), reduce the additional load on the helicopter lifting system, and improve flight economy and safety.
02
Good machinability
6061 aluminum alloy has an "excellent" machinability rating, low cutting resistance, and low tool wear rate. It is suitable for high-speed CNC machining and can achieve high-precision forming of complex structures. Its machining efficiency is about 20% higher than that of other high-strength aluminum alloys (such as 7075).
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Reliable corrosion resistance
A thin and dense oxide film can be formed in the natural environment. After anodizing treatment, the corrosion resistance is further enhanced, which can adapt to the operation requirements of helicopters in harsh environments such as oceans and deserts and reduce maintenance costs.
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Cost-effectiveness
Compared with aviation-grade titanium alloy or 7000 series aluminum alloy, 6061 aluminum alloy has lower raw material cost and mature production and processing technology, making it suitable for mass production. While meeting product performance requirements, it has a high cost-effectiveness.
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about Us
Xi 'an Hi-Precision Machinery Co., Ltd is a professional factory specializing in precision CNC machining and are proud to introduce our capabilities in CNC manufacturing pulley for helicopter handling products. Our factory is equipped with advanced three-, four-, and five-axis CNC machining centers, CNC lathes, and other equipment to ensure precise cutting of complex contours. Our team of experienced engineers, programming experts, and skilled operators ensures strict control throughout the entire process, from drawing review to process planning. We implement stringent quality control procedures and utilize testing equipment such as coordinate measuring machines to comprehensively inspect raw materials, processes, and finished products. For surface treatment, we offer a variety of processes, including anodizing, electroless nickel plating, and hard anodizing, to enhance wear and corrosion resistance, tailored to the operating conditions of your helicopter components. We also offer expedited sampling services, support small-batch trial production, and provide comprehensive after-sales technical support to ensure a smooth and worry-free project from start to finish.
Why Choose Us
Our Advantages
This is the main reason why you choose us.
High precision
We are able to complete complex pulley structures such as rope grooves, bearing positions, and weight-reducing holes with high precision in one go, ensuring dimensional consistency and interchangeability.
High strength
We are able to directly process high-strength aluminum alloys, titanium alloys and other aviation materials to ensure that the pulley has an extremely high strength-to-weight ratio when bearing heavy loads.
Excellent surface finish
Excellent surface finish can effectively reduce rope wear and extend product life.
quick response
Our quick response to design changes and sample verification also provides reliable quality assurance for subsequent mass production.
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