Batch Validation by a Leading New-Energy Vehicle OEM: Multiple Real-World Test Reports Reveal the True Performance of China’s Domestic Gear-Hobbing Machines

In 2025, China’s production and sales of new-energy vehicles reached 16.626 million units and 16.49 million units, respectively, representing year-on-year increases of 29% and 28.2%. China has maintained its position as the world’s largest producer and seller of new-energy vehicles for the 11th consecutive year. This explosive growth in the complete-vehicle sector has not only reshaped the global automotive landscape but has also powerfully driven the coordinated upgrading of upstream core-component suppliers and high-end equipment manufacturing chains.

As the “heart” of the electric drive system in new-energy vehicles, the gear’s machining accuracy directly determines the vehicle’s NVH (noise, vibration, and harshness) performance, transmission efficiency, and driving range. However, in this critical manufacturing stage, domestic OEMs and gear manufacturers have long been stuck in an ingrained mindset of “import dependence” when selecting core machining equipment.

What is the true performance of domestically produced high-end machine tools in the precision manufacturing of new-energy vehicles? This article draws on authoritative test reports and frontline application data to conduct an in-depth analysis of the real-world capabilities of the H30D dual-station worm-wheel grinding machine from Hunan ZDCY CNC Equipment Co., Ltd. (hereinafter referred to as “ZDCY”), exploring the breakthroughs achieved by domestic high-end machine tools in terms of accuracy, efficiency, and stability.

I. Benchmarking the Grinding Performance of the H30D Against Leading International Models 

We selected three internationally mainstream brands of worm-wheel grinding machines (Equipment A, B, and C) and conducted three independent comparative tests against the ZDCY H30D, using the same workpieces in each test. In each comparison, the H30D machined a batch of identically specified new-energy-vehicle gear components alongside one of the imported machines.

Group 1: New Energy Axial Gear Machining (a leading new-force supply chain) 

Measured data:

Imported Equipment A: Processing cycle time of 55 seconds, with a first-pass yield exceeding 98%.

Domestic H30D: machining cycle time of 89 seconds, with a first-pass yield exceeding 98%.

Results Analysis: 
Although, in terms of machining cycle time, the imported benchmark equipment A in this technology segment continues to hold an efficiency advantage, the H30D has achieved precision and first-pass yield levels that are fully on par with the import standard. This demonstrates that domestically produced equipment is now capable of handling high-end shaft-gear machining, and with further optimization of process parameters, there remains substantial room for efficiency improvement.

Group 2: Machining of New-Energy Gear Teeth and Shaft Teeth (Supply Chain for a Leading Automotive OEM) 

Measured data:

Gear tooth machining:

Imported Equipment B: Cycle time of 150 seconds, with a first-pass yield greater than 98%.

Domestically produced H30D: cycle time of 114 seconds, first-pass yield >98%.

Shaft gear machining:

Imported Equipment B: Cycle time of 90 seconds, first-pass yield of 80%.

Domestic H30D: cycle time of 89 seconds, first-pass yield of 95%.

Results Analysis: 
In this comparative analysis, the domestically produced H30D demonstrates approximately 30% higher efficiency in gear hobbing, while maintaining comparable efficiency in shaft gear machining and achieving a higher first-pass yield than imported equipment.

Group 3: Gear Machining for New Energy Applications (Supply Chain of a Major Component Manufacturer) 

Measured data:

Imported Equipment C: processing cycle time of 110 seconds, with a first-pass yield greater than 95%.

Domestically produced H30D: machining cycle time of 76 seconds, with a 100% first-pass yield.

Results Analysis: 
When tackling equally demanding dual-station machining tasks, the domestically produced H30D not only reduces cycle time by 30% but also achieves a 100% first-pass yield. This demonstrates that, in certain high-end application scenarios, the overall performance—combining efficiency and quality—of domestic equipment has already surpassed that of comparable imported competitors.

II. Practical Validation: Gear Machining Cases for Three High-End Vehicle Models 

The data speak for themselves. Below are the actual gear-machining results achieved by H30D on three typical new-energy vehicle models, all using worm-wheel grinding with form-grinding technology. The relevant data are sourced from the official inspection records of the OEM’s Tier-1 suppliers.

Case 1: Intermediate Shaft Driven Gear 

- Product specifications: 23 teeth, module 1.938, tooth width 41, pressure angle 20°; left-hand helix, helix angle 21°.

- Key performance indicators: gear grinding accuracy at Grade 3, ffα within 0.0012 mm, ffβ within 0.001 mm, Fourier primary harmonic component <0.2 μm (with no in-phase spurious harmonics), tooth surface roughness Ra 0.3 μm, and CPK value of 1.67.

- Processing cycle time: 83 seconds.

Case 2: Primary Reducer Drive Gear Shaft 

- Product specifications: Number of teeth: 27; Module: 1.701; Tooth width: 36; Pressure angle: 17.5°; Helix direction: left-hand; Helix angle: 30°.

- Key performance indicators: gear grinding accuracy at Grade 3, ffα within 0.0012 mm, ffβ within 0.001 mm, Fourier primary harmonic component <0.2 μm (with no in-phase spurious harmonics), tooth surface roughness Ra 0.3 μm, and CPK value of 1.67.

- Processing cycle time: 76 seconds.

Case 3: Driven Gear Teeth of the Final Drive 

- Product specifications: Number of teeth: 82; Tooth width: 38; Module: 2.32; Pressure angle: 19.1°; Helix direction: left-hand; Helix angle: 27°

- Key performance indicators: gear grinding accuracy of Grade 3, ffα within 0.0012 mm, ffβ within 0.001 mm, tooth surface roughness Ra 0.3 μm, and a CPK value of 1.67.

- Processing cycle time: 102 seconds.

The foregoing data fully demonstrate that the ZDCY H30D worm-wheel grinding machine with abrasive wheels fully meets the requirements for high-precision, high-efficiency, and high-stability mass production of gears for high-end new-energy vehicles, with its overall performance now on par with the international mainstream.

III. Cost Reduction and Efficiency Enhancement: The Differentiated Competitive Advantage of Domestic Equipment

With performance levels being comparable, price and service have become the practical factors that drive decision-making across the industry value chain. According to industry feedback, domestically produced gear-grinding machines—such as the H30D—typically command purchase prices that are about 50% to 60% of those for comparable imported equipment. Moreover, domestic equipment enjoys inherent locational advantages in terms of after-sales response times, the efficiency of spare-parts supply, and the cost of technical support.

For the new-energy industry chain, which is locked in intense cost competition, structurally optimizing equipment procurement and O&M costs is increasingly becoming a key pathway for companies to enhance their overall competitiveness.

IV. Technological Foundation: From Single-Category Champions to Breakthroughs Across All Fields

ZDCY has more than two decades of experience in the field of spiral bevel gear machining equipment, having established a closed-loop system that integrates the theory and manufacturing of both standard and modified tooth profiles for spiral bevel gears. Its dry-cutting complete sets of spiral bevel gear machining equipment have been recognized as a “National Manufacturing Single Champion.” In recent years, the company has extended its core technological capabilities to cylindrical gear machining equipment, launching the H30D CNC worm-wheel grinding machine. After more than three years of market validation, this product has now been incorporated into the supply chains of leading OEMs.

From the intricately machined bevel gears to the more widely used cylindrical gears, this technological migration path reflects the systematic capabilities that domestically produced high-end machine tools have gradually established in core areas.

Conclusion: Collaborative Symbiosis, Jointly Building a New High Ground for China’s Intelligent Manufacturing 

In the niche segment of gear machining for new-energy vehicles, domestically produced high-end machine tools—led by ZDCY—have now attained the capability to compete on equal footing with world-class counterparts. For OEMs and gear manufacturers, opting for cost-effective, highly adaptable domestic equipment is an inevitable choice for reducing costs, boosting efficiency, and enhancing supply-chain security; meanwhile, the trust and adoption of such equipment by OEMs and gear makers provide the ideal environment for continuous technological advancement.

China’s sustained leadership in the new-energy-vehicle industry hinges on seamless collaboration across the entire value chain—from materials and components to core manufacturing equipment. With the combined forces of policy guidance, market-driven demand, and corporate innovation, Chinese smart-manufacturing enterprises like ZDCY are poised to secure a pivotal position in the global core supply chain for new-energy vehicles, leveraging cutting-edge technologies to underpin the continued success of China’s new-energy sector.