New Energy Vehicle Chen Chuanhong | How do you view the application of cold forging technology in the field of robotics?

Industry Viewpoint

The cold forging process is one of the mainstream routes for making planetary roller screw threads, and its application scenarios have a high degree of overlap with the turning and milling processes. The most widely used thread processing methods are rolling method (a type of forging, including thread rolling and thread rolling) and cutting method (including turning, milling, grinding, etc.). The two types of methods specifically used to process threads are (1) turning and milling, which means that after the rough blank is hot-processed, it is roughed by turning and milling first, and the subsequent remaining finishing is completed by grinding to achieve high precision. ; (2) Cold forging and grinding refers to first using cold rolling technology to directly process the rough blank to a certain accuracy, and the subsequent remaining finishing is completed by grinding.

The cold forging process has high efficiency and low cost, and the highest processing accuracy can reach C5 level. It is expected to help the mass production of planetary roller screws. The use of turning and milling processes to produce planetary roller screws faces many difficulties in quality stability, manufacturing cost and production efficiency, which limits its application and promotion in practice. Cold forging has multiple advantages: 1. The thread surface quality is better; 2. The hardness and strength of the surface metal of the workpiece are improved; 3. The economic efficiency is several to dozens of times higher than that of cutting threads; 4. Chip-free processing can save raw materials; 5. It can Processing of slender screw; ⑥Higher corrosion resistance.

Looking at the supply chain, it is recommended to pay attention to cold forging process equipment and processing.

(1) Equipment link: Thread rolling machine (replaced by domestic production) is used to make trapezoidal screws, and rolling machine (reliant on imports) is used to make planetary roller screws. Mainstream trapezoidal screws are produced by thread rolling machines, and thread rolling machines have basically been replaced by domestic ones. Most trapezoidal screws are produced by cold forming, which has low cost and high output. Balls and roller screws can achieve higher precision by using cold forming rolling machines. my country mainly relies on overseas imports. At present, Baofeluo, Kennifu, and Iwag already have C5 precision capabilities. It is recommended that domestic companies pay attention to Sijin Intelligent (the first A-share listed company in the cold forming equipment manufacturing industry).

(2) Mold link: The core technical link of the cold forging process, both internal and external threads can be processed, and manufacturing threads and gears at the same time can greatly improve efficiency. The external threads and gears can be formed in one step through the mold, which is beneficial to cost reduction and efficiency improvement, and the finished product has good stability. Compared with cutting, cold extrusion internal threads have the advantages of high strength, high precision, high smoothness, and low consumables. It is recommended to pay attention to Hengfeng Tools, which has both internal and external thread dies.

(3) Processing link: my country's cold forging technology has been used in batches for thread production. Cold forging forming technology appeared earlier in our country and has been used in batch production of shaft parts such as threads, gears, splines, and screws. However, there is a lack of understanding of forming equipment, control of forming accuracy, and understanding of forming mechanisms. Therefore, in practice The quality of parts produced needs to be improved. Domestic entities that have mastered cold forging technology include Xinjian, Beijing Gear, Nanjing Technology, New Coordinate (a leading enterprise in the field of internal cooling precision forging), Qingdao Shengjian Machinery Factory, Taiyuan University of Science and Technology, Chongqing University, etc.

Investment Advice

Humanoid robots are entering a stage of rapid technology and cost iteration. Compared with the "turning and milling" process, the "cold forging and grinding" process has high efficiency and low cost, and the cold forging accuracy can reach C5 level. The use of a grinder can stably process qualified parts of humanoid robot roller screws, and is a method suitable for high-efficiency mass production of roller screws. It is recommended to pay attention to manufacturing, molds and equipment: for the manufacturing link, it is recommended to pay attention to the new coordinates of cold forging precision parts suppliers (with full industry chain R&D capabilities such as mold design and processing, cold forging process research and development, special tooling and equipment design, etc.); for the mold link, it is recommended to pay attention to Hengfeng Tools (a variety of cold extrusion tools, precision broaching tools, spline measuring tools and other products have the largest market share); equipment links include thread rolling machines, thread rolling machines and rolling machines. The core attraction is the domestic production of rolling machines. , it is recommended to pay attention to Sijin Intelligent (a technology leader in the internal cooling forming equipment industry).

risk warning

The technical route is uncertain and the risk is that the volume of humanoid robots is lower than expected.

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