Yuhuan CNC Machine Tool Co., Ltd. (stock abbreviation: Yuhuan CNC, stock code: 002903) was established in 2014 (Yuhuan CNC predecessor was founded in 1995). It specializes in the research and development, production, sales and service of CNC grinding machines and intelligent equipment, providing customers with comprehensive solutions for precision grinding and intelligent manufacturing technology; it is a key national equipment manufacturing enterprise, a high-tech enterprise, and a national-level "small giant" enterprise. The main products are CNC grinding machines, CNC polishing machines, CNC broaching machines and intelligent equipment series products, widely used in aerospace, rail transit, machine tool manufacturing, automotive parts, semiconductor industries, and other fields requiring high-precision grinding and precision polishing.

The company was listed on the Shenzhen Stock Exchange in 2017, and is the first A-share listed CNC machine tool company in Hunan Province. It has two industrial bases in Liuyang and Xingsha, covering an area of over 200 mu (approximately 33 acres) and a construction area of approximately 100,000 square meters, with nearly 700 employees. Currently, it has five subsidiaries: Hunan Yuhuan Intelligent Equipment Co., Ltd., Hunan Yuhuan Precision Manufacturing Co., Ltd., Hunan Yuhuan Jingyan Technology Co., Ltd., Yuhuan International (Singapore) Co., Ltd., and Hunan Southern Machine Tool Co., Ltd..

The company continuously provides comprehensive CNC grinding and intelligent manufacturing technology solutions for well-known domestic and foreign enterprises. The quality and performance of its main products have reached the advanced level of similar international products. The company has gained recognition from many high-end customers at home and abroad in the process of providing products and services, and is a strategic cooperation equipment supplier for Apple. Major customers include Foxconn, Jabil Circuit, Lens Technology, BYD, and other famous companies in the consumer electronics field; TATA (India), MAHLE Group, Federal-Mogul, Anqing Debogertz Piston Ring Co., Ltd., Wanxiang Qianchao, Renben Bearing, Luoyang Bearing, Changzhou Guangyang Bearing, and other famous enterprises in the automotive parts industry; Changguang Satellite, Liming Aviation, Xingtu Aviation, Xi'an Aircraft Industry (Group) Co., Ltd., and other famous enterprises in the aerospace field. The company's products are exported to the United States, Japan, South Korea, India, Thailand, Vietnam, Taiwan and other countries and regions, and the Yuhuan brand enjoys a good market reputation and influence.

The company formulates and implements a "digital high-quality innovative development" strategy, learns from and draws on the experience of advanced international CNC machine tool enterprises, establishes a "dual control and dual drive" quality management model based on "three modernizations" empowerment, strives to create a brand name card for Chinese industrial mother machines, and forms the core competitiveness of precise and efficient CNC grinding machines. The company has won the "Changsha Mayor's Quality Award" and is striving for the "Hunan Governor's Quality Award".

The company does not forget its "four qualities"—quality of character, conduct, products, and brand—and adheres to the corporate mission of "achieving cutting-edge manufacturing and revitalizing the national industry." It is committed to becoming a world-class enterprise in the high-end precision grinding and intelligent equipment industry. The company upholds the core values of "responsibility, loyalty, and dedication," a quality culture of "enterprise life, customer satisfaction, total participation, and industry best," and adheres to the quality policy of "people-oriented, technological innovation, quality creation, management efficiency improvement, and excellent service" to provide customers with the most cost-effective products and services.

The company is full of innovative spirit and is forging ahead to build its core name card as a "professional provider of precision grinding and intelligent manufacturing technology solutions" and become a leader in the CNC grinding equipment and intelligent equipment industry.

YHMG7776 High-Precision CNC Vertical Double-Ended Grinding Machine

The YHMG7776 high-precision CNC vertical double-ended grinding machine, meticulously crafted by Yuhuan CNC Machine Tool Co., Ltd., is specifically designed for the precision grinding of double-ended surfaces of new energy vehicle carbon ceramic/carbon carbon brake discs. It is a highly innovative high-end equipment.

This grinding machine features a cleverly designed structure. It adopts a vertical layout, with the upper and lower spindle components located inside the housing, and the feeding component on the front of the housing. It is compact, highly rigid, and easy to operate. The upper and lower housings are connected by spherical hinge support, which can accurately adjust the upper grinding wheel position accuracy. The radial runout and end face runout of the spindle are minimal, ensuring processing accuracy. The feeding component uses hard rail connection and servo drive for precise positioning. The dual mechanical spindle is driven by a 45kW frequency conversion motor, which is powerful and reliable with high-precision bearings.

In terms of processing principle, it uses a pair of abrasive wheels to simultaneously process two surfaces. The upper and lower grinding wheels rotate synchronously in opposite directions and feed vertically. The workpiece rotates automatically and moves linearly reciprocating. Combined with advanced expanding sleeves, vacuum and pneumatic clamping mechanisms, the positioning and clamping are stable. The grinding wheel can be automatically dressed to ensure grinding effect.

Its processing performance is excellent. It can process workpieces with an outer diameter ≥φ330≤φ480mm and a thickness of 20-60mm, with a production cycle of only 15 minutes/piece. The processing accuracy is extremely high, with planarity reaching 0.02mm, parallelism 0.03mm, and surface roughness Ra1.6μm. In addition, it reserves interfaces for automated detection and loading and unloading, providing convenience for automated production upgrades, and has significant advantages in the production of new energy vehicle brake discs.

1. YHMKG5325×60 High-Precision CNC Gantry Guideway Grinding Machine

Yuhuan CNC Machine Tool Co., Ltd., with its deep technical accumulation, has created the YHMKG5325×60 high-precision CNC gantry guideway grinding machine. It is an ideal processing equipment for machine tool manufacturing, industrial measuring instruments, transportation, and aerospace and military industries. It is committed to breaking the dependence on imports and achieving the localization of high-precision grinding machines.

This grinding machine adopts a unique gantry structure design and hydrostatic technology, ensuring processing accuracy and long-term maintenance of accuracy. The horizontal and vertical universal grinding heads can achieve multi-element one-time grinding, greatly improving processing efficiency. Its parameterized human-machine interaction software is equipped with a full-function CNC program package, making it easy to operate; the online dynamic balance and AE system provide strong guarantees for high-precision processing.

In terms of processing capacity, the worktable size is 2500×6000mm, the gantry width is 3200mm, the maximum pass width is 3000mm, and the grinding range is wide. The grinding height is 1200mm, and the maximum load capacity of the worktable is 17500kg, which can meet the processing needs of various large and medium-sized workpieces. The horizontal spindle grinding head and the vertical spindle grinding head each have their own advantages. The horizontal spindle grinding head has a grinding wheel size of 600×100×203.2mm, a power of 22(*30)kW, and a speed of 500-1500rpm; the vertical spindle grinding head has a grinding wheel size of 400×60×127mm, a power of 15(*18)kW, and a speed of 1000-3000rpm. The speed adjustment range of each axis is reasonable: worktable (X-axis) 5000-25000mm/min, crossbeam (Y-axis) 0.01-4000mm/min, horizontal grinding head (Z-axis) and vertical grinding head (W-axis) are both 0.001-400mm/min, which can flexibly adapt to different processing scenarios. The YHMKG5325×60 high-precision CNC gantry guideway grinding machine, with its excellent performance, is an excellent choice for high-precision grinding of large and medium-sized plane and guideway surfaces with large allowances.

1. HG Series High-Precision Horizontal Grinding Solutions

The HG series is suitable for high-efficiency grinding of various surfaces such as the outer circle, inner hole, and end face of precision parts such as spindles, tool holders, and cams. The processing accuracy can reach IT3 - IT1 grade, and the surface roughness ≤Ra0.2. This series has many outstanding advantages: In process integration, multiple processes can be completed in a single clamping. Combined with multi-head automatic process switching and surface finishing grinding technology, it greatly improves production efficiency; In terms of function, multiple CNC axis linkage functions are optional, which can complete complex surface processing; High precision is due to hydrostatic technology, direct drive technology, and tailstock ±40μm precise micro-adjustment coordination, ensuring processing accuracy and precision retention; High stability is achieved through liquid hydrostatic guideways and 00-grade marble base, effectively reducing temperature influence and blocking vibration interference; In addition, online dynamic balancing, AE system, and online measurement technologies give the equipment high performance, and 3D simulation human-machine interaction software and a full-featured CNC package make operation more convenient.

The HG32 series is a typical representative, with a maximum distance between centers of 1500mm, a center height of 180mm, and an outer circle grinding motor power of 38Kw, which can meet the grinding needs of various specifications of parts. At the same time, there are 1420 series, 1432 series and other different specifications series, with different parameters such as maximum distance between centers, center height, and maximum grinding outer diameter. Enterprises can flexibly choose according to their own needs to meet the diverse requirements of precision grinding production, helping related industries to improve product quality and production efficiency.

2. TG Series High-Precision Plane Grinding Solution

The TG series high-precision plane grinding solution has demonstrated excellent performance in aerospace, machine tool manufacturing, automotive parts, and semiconductor industries.

This series is mainly used for high-efficiency grinding of high-precision and high-surface quality planes and stepped surfaces, with processing accuracy reaching IT3 - IT1 grade and surface roughness ≤Ra0.2. In terms of precision guarantee, hydrostatic technology and direct drive technology are used to ensure extremely high processing accuracy and good precision retention. The grinding head spindle uses an internal electric spindle, and BALANCE online dynamic balancing (optional) can also be configured as needed. The structure is compact and the vibration is small. The angle of the worktable is adjustable, which can adapt to various processing forms and meet the processing needs of different workpieces. In addition, the marble bed base has a precision of grade 00, with the characteristics of wear resistance, corrosion resistance, and low internal stress, effectively ensuring the high rigidity and precision stability of the equipment.

Taking TG73100 as an example, its worktable size is φ1000mm, the maximum grinding height is 350mm, the worktable tilt angle is ±3°, and the worktable speed is 0.1 - 80rpm (stepless), which can meet the processing of various specifications of workpieces. At the same time, this series also has 7340 series, 7360 series and other different specifications, with differences in turntable diameter, maximum swing diameter, maximum workpiece height and weight, etc. Enterprises can flexibly choose the appropriate model based on their actual production needs to achieve high-precision plane grinding processing, effectively improving product quality and production efficiency, which is an ideal choice for plane grinding processing.

3. VG-DVG-CVG Series High-Precision Vertical Grinding Solution

This series is widely used in aerospace, rail transit, and automotive parts industries. It can efficiently process parts with high precision and high surface quality requirements, and can achieve grinding of various elements such as inner holes, outer circles, and end faces. The processing accuracy reaches IT3 - IT1 grade, and the surface roughness ≤Ra0.2.

In terms of functional characteristics, it has significant advantages. Multiple CNC axis linkage functions can complete complex surface processing; Multiple processes can be completed in a single clamping, and combined with multi-head automatic process switching and surface finishing grinding technology, it greatly improves production efficiency. The use of hydrostatic technology ensures the high rigidity, high load-bearing capacity, and high precision retention of the equipment. At the same time, the combination of hydrostatic technology and direct drive technology ensures extremely high processing accuracy. In addition, the equipment is also equipped with 3D simulation human-machine interaction software and a full-featured CNC package, making operation convenient; online dynamic balancing, AE system, and online measurement technologies further improve processing performance.

Taking the VG80 series as an example, its worktable size is φ800mm, the maximum grinding height is 650mm, and the maximum load of the worktable is 1500Kg, which can meet the processing needs of various workpieces. This series also has different specifications and models, with different turntable diameters, maximum swing diameters, etc. Enterprises can flexibly choose according to their own production needs, which is an ideal choice for pursuing high-precision and high-efficiency parts processing.

2. LK71, LK22 Series CNC Mortise and Tenon External Broaching Machine

The LK71 and LK22 series CNC mortise and tenon external broaching machines are available in vertical and horizontal forms. They are high-precision, high-efficiency, and high-stability mortise and tenon special processing equipment. The broaching shaft has high rigidity and overload protection characteristics. The main drive adopts a drive device composed of a spindle motor, a safety coupling, and a gear reducer. The safety coupling can effectively prevent overload and alarm in time.

This series of products is equipped with high-precision A-axis and B-axis (horizontal type is A-axis and C-axis) indexing devices. It uses FAG/INA bearings and Heidenhain optical scales. The rotational positioning accuracy reaches 0.001° (4″), and both the end face runout and radial runout are less than 0.02. A closed-loop precision control system is formed by servo drive, high-rigidity mechanical structure, and optical scale feedback, which can dynamically correct errors and ensure broaching accuracy.

In terms of operation, the intelligent CNC system is equipped with embedded programs, supports a high degree of secondary development, and achieves one-button intelligent control and zero-programming operation, which is both safe and efficient. The equipment has a high degree of automation, a reasonable design, convenient workpiece loading and unloading, and maintenance, and can achieve 24-hour uninterrupted processing.

Different models have different parameters in broaching speed, return speed, feed stroke, and tool magazine storage device, such as broaching speed ranging from 0.5 - 60m/min, tool position, and number of tool magazines, which can meet diverse production needs and is an ideal choice for mortise and tenon processing in high-end manufacturing industries.

3. LK89 Series CNC Spiral Vertical Internal Broaching Machine

This four-axis linkage equipment is specially designed for the processing of internal helical or straight teeth, with an accuracy of up to grade 5 GB/T10095, far exceeding the domestic level. Its core advantage lies in the innovative "five-center coplanar" patented structure (patent number: ZL 2022 2 2491897.5). Through a unique double cylindrical guideway pair and double-drive design, it achieves the coplanarity of five centers, which is highly symmetrical in terms of force, effectively eliminating the "broaching overturning moment", and ensuring stable processing. At the same time, the zero-backlash C-axis indexing device (patent number: ZL 2020 1 1029578.1) has an indexing accuracy of 0.001° (3.6″), and combined with a closed-loop precision control system, using servo drive, gantry screw structure, and double optical scale feedback, it corrects errors in real time and guarantees broaching accuracy.

Ease of operation is also a major highlight of this device. The intelligent CNC system, coupled with embedded programs, supports a high degree of secondary development, enabling one-button intelligent control and plug-and-play functionality without programming. The quick tooling change and automatic positioning functions allow even novice operators to easily get started. In addition, the device has a bidirectional operation function, making tooling changes flexible.

This series covers a variety of models, such as LK8905 - LK8940. Different models have different parameters in terms of rated tensile force, stroke, etc., which can meet the diverse needs of multiple industries such as new energy, humanoid robots, military industry, and aerospace, providing strong support for industrial upgrading.

1. YH2MG84125 High-Precision Vertical Double-Sided Grinding (Polishing) Machine

The YH2MG84125 high-precision vertical double-sided grinding (polishing) machine is an automatic and efficient machine tool specially designed for precision plane grinding and polishing.

This machine tool has a wide range of applications. It can use grinding fluid, polishing fluid, and other free abrasives to grind and polish semiconductor materials such as silicon carbide and monocrystalline silicon. It can also use CBN grinding wheels, diamond grinding wheels, and other bonded abrasives to thin metal and non-metal hard and brittle materials such as steel, cemented carbide, ceramics, and glass. It has many significant advantages: four motors are independently driven to achieve stepless speed regulation, the operation is stable and the vibration is small, and it can well adapt to various process requirements; the upper plate is equipped with shape and temperature detection sensors, which can detect the workpiece thickness and plate deformation in real time and make adjustments; the lower plate uses high-precision turntable bearings, ensuring precision and stability. In addition, the high-precision airbag pressurization system achieves precise pressure control in three stages: pre-pressure, main pressure, and post-pressure; the machine tool is equipped with a thermal balance temperature control system to effectively prevent deformation of the upper and lower plates and ensure processing accuracy; PLC control and a dedicated HMI interactive interface are used, making operation flexible and reliable, and providing a user-friendly human-machine interaction experience.

In terms of technical parameters, the machine tool can process workpieces with a maximum diameter of Φ420mm and a maximum thickness of 40mm. The planetary wheel diameter is Φ492mm and the quantity is 4 (or 5 planetary wheels, with a planetary wheel diameter of φ456). The upper and lower plate diameters are both φ1250×φ345×50, the upper plate speed is 30Rpm, the lower plate speed is 60Rpm, the maximum loading pressure is 1500Kg, and the total power of the main unit is 55Kw. Whether it is semiconductor chip manufacturing, optical lens manufacturing, or precision machining of mechanical parts, the YH2MG84125 can meet the high-precision plane grinding and polishing requirements with its excellent performance.

2. YHMG7430 High-Precision Vertical Single-Sided Grinding Machine

The YHMG7430 high-precision vertical single-sided grinding machine demonstrates excellent performance in the field of precision thinning of hard and brittle materials.

This grinding machine is specially designed for hard and brittle materials such as sapphire, silicon carbide, and ceramics, and is suitable for precision thinning of 4-12 inch specifications. The processing workpiece size range is Φ50 - Φ300mm, and the thickness range is 0.15 - 50mm. Its outstanding advantages are reflected in several aspects: the grinding wheel spindle adopts a high-precision air-bearing dedicated electric spindle, which is speed-regulated by a CNC system through a frequency converter, and can flexibly adjust the process speed according to different products; both the air-bearing spindle and the worktable spindle have high rigidity, low vibration, and low thermal expansion characteristics, providing a solid guarantee for high-precision processing. At the same time, the high-precision ball screw and guide rail components are matched with a servo closed-loop control system drive to ensure precise operation of the equipment.

A 12-inch national standard diamond-specific grinding wheel is used for the grinding wheel, and the particle size can be customized according to customer process requirements. The thinning unit is based on the principle of axial feed grinding and is compatible with Φ300 - Φ50mm wafer grinding and thinning. In addition, the equipment also has multi-stage grinding programs and overload waiting functions to meet diverse process requirements.

In terms of technical parameters, the Z-axis has an effective stroke of 100mm and an origin function, the minimum movement resolution reaches 0.0001mm, TTV≤2um(8 inches), WTW≤±2um(8 inches), surface roughness Ra≤0.015um (2000 mesh grinding wheel), grinding head speed 50 - 2000rpm stepless speed regulation, grinding wheel spindle power 11Kw, and total main unit power 25Kw. Whether it is wafer thinning in semiconductor chip manufacturing or precision processing of optical components and electronic ceramics, the YHMG7430 can achieve efficient and high-quality processing with its precise control and stable performance, making it an ideal choice for precision thinning of hard and brittle materials.