»MM Maschinenmarkt« China

Against the backdrop of continuous upgrades in new energy vehicle thermal management systems, the machining precision and efficiency of the scroll compressor’s core component—the aluminum alloy scroll rotor—directly determine the energy efficiency of the entire vehicle’s air conditioning system. In high-speed finishing of aluminum alloy scroll rotors, manufacturers have long faced four major challenges: short tool life, fluctuating machining accuracy, high processing costs, and difficult-to-control built-up edge.

Recently, a customer in Nanjing collaborated with Yongpu Precision, utilizing Yongpu’s YPP Mill® diamond-coated scroll milling cutter (D12R0.65) on a Doosan DNM 415 vertical machining center to complete a full-process validation test. This provides a replicable technical benchmark for achieving high-efficiency and high-precision machining of new energy vehicle core components.

Full-Link Analysis from Equipment to Workpiece in the Machining Scenario

Automotive air conditioning compressor scroll rotors are typically made of aluminum alloys (e.g., ADC12, 4032). The product profile is complex and precise, posing significant processing challenges. Perpendicularity must be controlled within ≤0.015 mm and position tolerance within ≤0.025 mm, reflecting extremely stringent precision requirements.

Validation tests conducted on a Doosan DNM 415 vertical machining center demonstrate that the Yongpu Precision engineered YPP Mill® diamond-coated scroll milling cutter achieves a breakthrough in machining performance. The tool features an innovative 6-flute unequal indexing geometry combined with a nano-diamond coating. Leveraging the dual advantages of blade geometry and coating material, it thoroughly resolves industry pain points such as aluminum adhesion, surface scoring, and instability in geometric tolerances.

On-site machining results are outstanding: aluminum chips are smoothly evacuated in continuous spiral form, with no chip wrapping or secondary cutting. Workpiece surfaces are clean and mark-free, and all geometric tolerances are consistently achieved. This fully demonstrates the powerful synergy between the chip flute design and the diamond coating of the YPP Mill® diamond-coated scroll milling cutter, providing a mature and efficient one-stop solution for the processing of precision aluminum scroll components in the automotive industry.

When machining aluminum alloy scroll rotors with Yongpu Precision's YPP Mill® diamond-coated milling cutter, there is no chip wrapping or secondary cutting; the workpiece surface is clean and mark-free, and geometric tolerances are consistently achieved.

The core innovation of YPP Mill® lies in the dual optimization of “material + structure”:

Nano-diamond coating: The coating hardness reaches over HV8000, with a friction coefficient as low as 0.1, effectively suppressing aluminum alloy adhesion during cutting and preventing built-up edge formation.

Scroll chip flute design: The large helix angle combined with the unequal indexing geometry ensures more uniform cutting force distribution, smoother chip evacuation, reduced cutting vibration, and reliable attainment of workpiece geometric tolerances.

6-flute high-efficiency cutting: While maintaining cutting stability, it increases the material removal rate per unit time, enabling high-efficiency machining.

Yongpu YPP Mill® diamond-coated scroll milling cutter

Measured Data and Economic Benefits

On the Doosan DNM 415, with cutting parameters kept unchanged (S3500 rpm, F1200 mm/min, Vc = 132 m/min), a comparative test was conducted between the YPP Mill® tool and the original domestic tool.

Based on an annual output of 3 million pieces, using Yongpu YPP Mill® tools can save customers approximately 205,000 RMB per year in tooling costs. Meanwhile, due to reduced tool change frequency, equipment utilization rate increases by 15%, resulting in significant indirect economic benefits.

MM Modern Magazine report

MM Modern Magazine has done a special report on this major technological breakthrough: 

https://mw.jgvogel.cn/c1597941.shtml#picture23896

Conclusion 

Leveraging high-end diamond-coated tool materials, combined with the innovative scroll chip flute and 6-flute unequal indexing proprietary geometry, Yongpu Precision's YPP Mill® diamond-coated tools can thoroughly resolve industry challenges such as short tool life and difficulty in maintaining precision when machining aluminum alloy scroll rotors. Paired with the ultra-high stability of the Doosan DNM 415 vertical machining center, it provides reliable equipment support for the implementation of the complete precision machining process solution.

With the rapid development of new energy vehicles and the continuous upgrading of energy efficiency standards for air conditioning compressors, scroll rotors demand higher machining precision and production efficiency. Yongpu Precision will continue to deepen its expertise in coating technology, edge geometry optimization, and cutting adaptability upgrades, leveraging the advantages of high-end machining center equipment. With a one-stop solution for solid round tools featuring high precision, long life, and high stability, Yongpu Precision aims to help improve the quality and efficiency of NEV scroll rotor machining and lead the upgrading and development of the precision aluminum component processing industry.

Learn More by visiting Yongpu Website: www.yp-tec.com