01.Basic situation
As a mechanical component, the main function of the screw is to convert rotational motion into linear motion. The motor drives the screw shaft to rotate through the coupling. The nut on the screw shaft performs linear reciprocating movement under the threaded drive, thereby converting the movement. rotational torque of the motor in the straight line drive. The trapezoidal screw has simple structure, low cost, low transmission efficiency and low precision. It is generally used in machine tools, mining and other fields. The balls are installed in the screw and nut as intermediate transmission parts to reduce the friction of the movement, which is the ball screw, and are suitable for high precision transmission fields.
The protagonist of this article, the planetary roller screw, uses rollers instead of balls, which can bear higher loads, have higher speeds and precision. It is the best choice for electromechanical servo system actuator under the conditions of small size, long life and high performance. Compared with ordinary roller screws, the suitable load of planetary roller screws is about 3-5 times, and the service life is also up to 15 times. It is mainly used in various fields such as industrial manufacturing, aerospace, medical and military equipment. . Precision machines and automation equipment.
02. Industrial chain
As a high-precision and high-performance transmission device, the planetary roller screw adopts a compact planetary gear structure. The whole device is small and can be easily integrated into equipment with limited space. The main production processes such as blank forming, precision machining, heat treatment, precision grinding and flaw detection are similar to those of bearings.
It should be pointed out that the raw materials of high-precision screws require special metals, most of which are bearing steels and low-carbon alloy steels. The processing technology of screw shaft is divided into two types: cold rolling and grinding. The annealing process of cold rolling method and thread grinding method are difficult to process. Equipment determines accuracy and efficiency. The grinder is the basic equipment for processing screws. There are also cyclone milling, heat treatment, straightening and other equipment.
03. Market and large companies
As mentioned before, planetary roller screws are used in high-precision transmission fields, and the current main urgent scenario is humanoid robots. In this industry, planetary roller screws can provide stable and precise power transmission for the joints of humanoid robots, achieving more precise and smoother joint movements, thereby simulating various movements of the human body, such as walking, running , jumping, etc. Additionally, the smaller the planetary roller screw, the more space utilization of the linear actuator can be increased, thus providing a linear actuator solution for precise control in small spaces such as dexterous hands . This is also a hot topic in the industry lately.
For planetary roller screws, the current domestic planetary roller screw market is mainly occupied by foreign manufacturers. Most of these companies are also traditional leaders in the screw industry. Schaeffler, the world leader in lead screws, occupies an absolutely dominant position. Its Swiss companies GSA, Swiss Rollvis and Swedish Ewellix are among the top three in the world. SKF is a global leader in bearing manufacturing and innovation. Nippon Seiko (NSK), the first and largest bearing manufacturer in Japan, has developed the world’s largest ultra-large ball screw with high load capacity. Japanese company THK is the first company in the world to develop methods of linear motion using rolling contact. It is also the world’s first company to develop linear guides and the world’s largest ball screw manufacturer. Moog, USA, is a leading global precision motion control system integrator with over thirty years of experience in the field of high precision planetary roller screws. A domestic enterprise, Dingzhi Technology, a provider of customized precision motion control solutions mainly composed of micromotors, has achieved an important milestone in the development and production of micro planetary roller screws. Xinjian Transmission, the first set at the provincial level, has the first batch production line of planetary roller screws in China and was the first to be applied in the automobile industry. NuoShi Robot focuses on the design, production and manufacturing of planetary roller screws and supporting actuator modules, and has just completed tens of millions of angel financing. Wuzhou Xinchun, a large-scale manufacturer in the bearing industry, has successfully developed miniature ball screw samples. As a result, the company’s stock price has increased by the daily limit for six consecutive years. has not yet been supplied in batches. In addition, Beite Technology, Shuanglin Co., Ltd., Best, Hengli Hydraulics, Shangyin Technology, Shandong Bote, Yintai Technology, Nanjing Technology, etc. all offer related products.
04. Multiple opinions
1. Looking at the number of enterprises, we can see that domestic supply problems are not significant in the low and mid-range sectors, and the competition is fierce. Companies must rely on technological innovation and cost control to continually improve their competitiveness.
2. High-end planetary roller screws are widely used in many fields. They currently rely on imports, but the domestic market is large and the demand is clear.
3. High-end planetary roller screws have high barriers in terms of materials, processes, equipment, etc., and related processing equipment also faces the risk of getting stuck.
4. Even the ability of companies that have developed matching products to produce consistent batches still needs to be verified. The overall cost of the product is high and how to reduce the cost is also the focus.
5. Compared with the low-lying economy, the largest industry after automobiles, humanoid robots are considered more likely to be realized. The unit price currently used in the industry is around 10,000 yuan, and there is great room for cost reduction.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
