The grinding exhibits exhibited by CIMT2019 include nearly 100 types of grinding machine exhibits, including cylindrical grinding machines, internal grinding machines, double end grinding machines, vertical composite grinding machines, tool grinding machines, coordinate grinding machines, thread grinding machines, gear grinding machines, center hole grinding machines, etc. The exhibits have a high level of technology and a complete range of categories. In terms of double end grinding machine tools, major domestic and foreign brands have exhibits, mainly with CNC vertical structures. Foreign brands mainly include German PETER WOLTLERS, German DISKUS, Korean AM, etc; Domestic brands mainly include Xinxiang Risheng and others.
Double end grinding machines are mainly used for grinding two opposite planes of workpieces, with high processing efficiency, high dimensional accuracy, and high degree of automation. They are widely used in industries such as automobiles, hydraulic systems, measuring tools, cutting tools, bearings, precision ceramics, etc. Typical types of processed parts are shown in the following figure.
Typical processing parts of double end grinding machine
1. PETER WOLTLERS, Germany
PETER WOLTLERS showcased in CIMT2019 an AC 1200 double end grinding machine with larger specifications compared to the previous two editions but belonging to the same series, designed for batch precision machining of workpieces. AC1200 can be used for precision grinding, grinding, and polishing processing through its modular design.
The AC1200 equipment adopts core components that the company has proven to be mature, such as high-precision pneumatic pressure systems, non-contact micro measurement controllers, powerful driving technology, and PC assisted control. The software developed by PETER WOLTLERS only requires a menu to intuitively operate the device. The rotating control console and frame design facilitate personnel access to the interior of the equipment. It can be connected to manual, semi-automatic, or fully automatic loading and unloading systems.
The equipment can choose different planetary rotation devices, driving power, and grinding wheel disc speed to match the maximum range of workpiece size. It ensures that each application can achieve the optimal device configuration (as shown in the following figure).
AC1200 can be equipped with various well-known and proven additional functions in the industry, such as gap control of the feeding table, alignment adjustment device, and quantitative feeding system for grinding, grinding, or polishing consumables. Other accessories, such as measurement sensors and post processing measurement systems, can provide statistical processing control data to provide safety assurance for processing critical workpieces. As a patented analysis tool, 'Data Care' can collect all controller data and is the perfect platform for process evaluation, optimization, and fault analysis. Its main indicators are: maximum diameter 380 mm, maximum thickness 100 mm, parallelism<1 μ m. Surface roughness Ra0.1 μ m.
2. Korean AM
AM Company showcased the ADL-700 double end grinding machine tool, which operates with two grinding discs and an inner ring driving the planetary wheel to rotate simultaneously. The planetary wheel carries the workpiece in reciprocating planetary motion between the two grinding discs. Depending on the material of the workpiece, different types of grinding discs can be selected, such as diamond, CBN, cast iron, GC, PVA, etc., which can perform double end face precision grinding, grinding, and polishing on various materials of the workpiece. Adopting advanced contact probe measurement method, equipped with a resolution of 0.5 μ The size controller of m provides real-time online measurement and control of the processed workpiece.
The main features of the machine tool are: (1) Digital size control system, ensuring long-term machining accuracy. (2) The upper, lower, and inner rings are all driven by independent motors, with high process scalability. (3) Dialog-type touch screen control interface, without programming, simple and easy to use. (4) It can adapt to various processing applications such as precision grinding, grinding, and polishing. (5) Adopting cylinder pressurization and multi-stage pressure control, the pressure value can be adjusted arbitrarily. (6) The upper plate can be rotated out, with a large operating space. With a semi-automatic loading and unloading workbench, it can achieve fast processing.
3. Xinxiang Risheng
The machine tool 2M84100G exhibited at this exhibition is an improved model, equipped with a stainless steel wire drawn protective cover. The water surface of the bed adopts a flat and wide design, and is equipped with a smooth self-leveling resin isolation layer, which has anti-corrosion and thermal insulation functions. At the same time, it can effectively prevent the accumulation of grinding residues and keep the inside of the bed clean.
The grinding wheel shaft on the machine tool is supported by NSK precision rolling bearings, with a stable structure and easy maintenance. The upper grinding wheel lifting and guiding part has undergone chrome plating hardening treatment on the surface, which has strong wear resistance and corrosion resistance. The grinding wheel under the machine tool adopts a patented combination bearing supported rotary table structure, which has high rigidity and stable and long-lasting accuracy.
The machine tool mainly adds self-aligning bearings to the connection between the pressure cylinder and the main shaft, making them floating and connected, significantly improving the sensitivity of the upper plate movement and making it more conducive to processing thin sheet workpieces.
The specific features of the machine tool include: (1) Adopting the Japanese Magnescale size control system with a resolution of 0.1 μ m. Ensure machining accuracy; At the same time, it can independently determine abnormal situations such as stacking and misalignment of workpieces. (2) The key supporting components such as the machine bed and the upper grinding wheel frame are respectively cast into shape using high-strength gray cast iron and ductile cast iron. After secondary aging treatment, they have good strength, stability, and damping. (3) The touch screen control interface has two processing modes: size control and time control. According to different grinding process requirements, it can be freely switched without programming and is simple and easy to use. (4) The machine tool has a self-diagnosis function, and the fault information is provided with text explanations and displayed in the form of pictures to facilitate timely troubleshooting. (5) Adopting multi-stage pressure control, the pressure value can be adjusted arbitrarily, and the control system automatically switches between different processing stages, with a new pressurized floating connection structure. (6) The machine tool adopts a large capacity coolant filtration temperature control system, uses paper tape precision filtration, and is equipped with a cold and hot temperature controller to ensure the quality and stability of the processed surface.
Main parameters for typical parts processing: maximum machining diameter 320 mm, maximum machining height 80 mm, thickness difference ± 1 μ m. Flatness ≤ 1 μ m. Parallelism ≤ 1 μ m. Surface roughness Ra0.1 μ m.
4. DISKUS, Germany
DISKUS double-sided grinding machine has a long reputation in the industry. This exhibition is a DFine series single/double sided grinding machine marble model, which is an innovative grinding machine that supports 2-8 spindle planetary grinding, grinding one surface at a time, and achieving double-sided precision grinding through an automatic flipping mechanism.
This machine tool adopts a natural marble bed, which has excellent mechanical stability, thermal stability, and damping, making it particularly suitable for the processing of high-precision, high surface quality parts. The machine tool has the characteristics of high efficiency and large cutting capacity of traditional double end grinding machines, as well as the characteristics of planetary motion precision grinding of double-sided grinding machine workpieces, combining the advantages of both.
This machine tool uses fixed fixtures for clamping, which can process workpieces with a larger aspect ratio than ordinary planetary grinding, and is more suitable for end face machining of typical parts such as various rollers and planetary reducer gears. At the same time, grinding the two surfaces of the workpiece separately can better solve the problem of inconsistent grinding volume caused by significant differences in grinding areas at both ends.
The main parameter indicators of typical parts are: maximum diameter 250 mm, maximum thickness 80mm, parallelism<1 μ m. Surface roughness Ra 0.1 μ m.
5. Conclusion
At present, most of the products of various brands both domestically and internationally are classic traditional structures similar to those exhibited by PETER WOLTLERS in Germany. In recent years, there has not been much innovation in terms of structure, working methods, and other aspects. The exhibition of DISKUS this time has a certain degree of innovation, combining the advantages of double-sided grinding machines and grinders. It uses fixed fixtures to clamp and solve some typical problems of double-sided grinding, which is a highlight of this type of exhibition.
Overall, domestic exhibits are constantly improving, but there is still a significant gap compared to internationally advanced products in terms of technological maturity, processing accuracy, product grade, and machine tool appearance, and there is still a long way to go. Increasing innovation research efforts, developing more targeted and distinctive products, making partial breakthroughs first, and then developing comprehensively, will help to continuously narrow the distance with advanced foreign products and meet the needs of domestic and foreign customers for high-end products.
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