Dalian University of Technology

Yuwen Sun

Wei Sun

Xin Liu

Xuyue Wang

Hang Gao

Jinlong Song

Liu Huang

Xiaolong Yin

Yumin Liu

Liang Sui

Shichao Yan

Shuyang Yan

Kang Ju

Shutao Qi

Chunzheng Duan

Jinting Xu

Zhuang Wang

Shuoxue Sun

Fangyuan Zhang

Shanglei Jiang

Jinjie Jia

The present invention discloses a clamping system and an adaptive clamping method for turning of thin-walled curved components. A curved component is positioned and clamped on the upper surface of the vacuum adsorption fixture, and a rubber sealing ring on an auxiliary support of the fixture is in contact with the inner contour of the curved surface to separate the closed space in the component into three independent adsorption force action areas: a flange end surface, a first vacuum chamber and a second vacuum chamber; and three independent vacuum channels are arranged in the fixture, the vacuum channels are communicated with sub-circuits through pneumatic hoses, and the on-off of the circuits is controlled by electromagnetic directional valves. The vacuum adsorption clamping system with multiple clamping modes can be adaptively adjusted according to the process stage of curved components.

Clamping system and adaptive clamping method for turning of thin-walled curved components

The present invention discloses a multi-task machining process on-line monitoring method and system based on cloud-edge collaboration, comprising multi-source sensing terminals, edge computing platforms and a cloud server. Each multi-source sensing terminal uses sensing equipment to obtain multi-source heterogeneous signals such as spindle vibration signals and acoustic emission signals generated in a machining process and transmit the signals to a controller of each edge computing platform; the edge computing platform is used for periodically collecting and processing the signals, synchronously monitoring cutting vibration, tool wear, tool breakage and machining surface quality in combination with intelligent prediction models, and uploading monitoring data to the cloud server; the cloud server is used for storing the monitoring data of each edge computing platform into the cloud database, and updating the intelligent prediction models regularly with global data to improve the generalization ability of the models.

Multi-task machining process on-line monitoring method and system based on cloud-edge collaboration

The present invention provides an on-machine real-time measurement method and system for a full-closed loop five-axis computer numerical control machine tool. In the system, a high-precision coaxial fixture in a displacement measurement component is used for connecting the component with the machine tool spindle; a multifunctional evaluation electronics box reads the signals of the grating scale of each machine axis in real time, and synchronously triggers the displacement sensor to collect the measured workpiece surface information; a synchronous communication module caches the grating scale signals of each machine axis and the measurement signals of the sensor to the FIFO rotation buffering module of the host computer in parallel to reduce the burden of high-speed transmission; and the host computer performs data processing and coordinate transformation of the grating scale data and the measurement information in the FIFO module, and finally obtains the three-dimensional geometric information of the measured workpiece surface.

On-machine real-time measurement method and system for full-closed loop five-axis computer numerical control (CNC) machine tool

The present invention discloses a flexible dot matrix bonding apparatus and an adaptive clamping method for a disk-type planar component. The apparatus mainly comprises three components: a substrate, connecting rods and an auxiliary support. The threaded holes in a circumferential array are uniformly distributed in the substrate, and the connecting rods are fixed at different circumferential positions of the substrate in a threaded connection manner, which play a role in bonding and supporting the disk-type planar component. The auxiliary support is matched with the substrate, so that a workpiece after turning can be taken out without damage. According to detection results of machining deformation of the disk-type planar component, the installation positions of the connecting rods on the substrate are adjusted accordingly, thus changing bonding positions of the disk-type planar component. Finally, an adaptive clamping method aiming at reducing the machining deformation of the disk-type planar component is formed.

Flexible dot matrix bonding apparatus and adaptive clamping method for disk-type planar component

A superhydrophobic hemispherical array which can realize droplet pancake bouncing phenomenon is provided. The superhydrophobic hemispherical array shows an arc-shape structure which is narrow at the top and wide at the bottom, where a is the angle that substrate-gas interface goes across the gas and reaches substrate-hemisphere interface, d refers to the diameter of the contact area between hemispherical structure and substrate, s represents the space between two adjoining hemispheres, h denotes the vertical height from the top of hemisphere to substrate surface, and 70&#xb0;&#x2264;a&#x2264;90&#xb0;, 900 &#x3bc;m&#x2264;d &#x2264;1700 &#x3bc;m, s&#x2264;550 &#x3bc;m, 600 &#x3bc;m&#x2264;h&#x2264;1100 &#x3bc;m, respectively. The superhydrophobic hemispherical array has a water contact angle larger than 150&#xb0; and roll-off angle lower than 10&#xb0;.

Superhydrophobic hemispherical array which can realize droplet pancake bouncing phenomenon

The present invention provides a cross-axis and cross-point modal testing and parameter identification method for predicting the cutting stability, which is used to improve the accuracy of existing prediction methods of cutting stability. The method firstly installs a miniature tri-axial acceleration sensor at the tool tip, and conducts the cross-axis and cross-point experimental modal tests respectively. The measured transfer functions are grouped according to different measuring axes, and the dynamic parameters are separately identified from each group of transfer functions. Then, the contact region between the cutter and workpiece is divided into several cutting layer differentiators. After that, together with other dynamic parameters, all the parameters are assembled into system dynamic parameter matrices matching with the dynamic model. Finally, dynamic parameter matrices including the effects of cross-axis and cross-point model couplings are obtained. Moreover, the acceleration sensor in the method only needs to be installed once.

Cross-axis and cross-point modal testing and parameter identification method for predicting the cutting stability

The invention discloses a synchronous self-locking pneumatic adaptive fixture used for the machining of annular thin-walled parts, belonging to the technical field of mechanical machining. The synchronous self-locking pneumatic adaptive fixture includes a zero point positioning system, a base body, a plurality of pressure plate mechanism assemblies, a plurality of columns, a plurality of support mechanism assemblies and a plurality of adaptive support body assemblies. Among them, the pressure plate mechanism assemblies complete the axial compression of the workpiece through the lever force increasing mechanisms and the orthogonal self-locking mechanisms. And the support mechanism assemblies complete the radial support of the workpiece through the rod slider mechanisms and the orthogonal self-locking mechanisms. The invention not only has high clamping efficiency and good stability, but also can ensure the reliable clamping and safe machining of the workpiece when the air source is disconnected.

Synchronous self-locking pneumatic adaptive fixture used for the machining of annular thin-walled parts

A tool quick-stop device for a lathe has a base, bottom plate, front side plate, rear side plate, right side plate, left side plate, top fixed plate, tool bar, cam lever, buffer spring, cylindrical guide rail, adjusting nut, first locking nut, double end stud, second locking nut, pressure spring, pressing plate, hold-down bolt and pin shaft. The cam lever supports the tool bar before tool falling. When tool falling is required, the cam lever is rotated through external force. When the cam lever rotates over a certain position, the tool bar instantaneously loses supporting force. Under strong pressure of the pressure spring, the tool bar falls the tool with great acceleration and is separated from the cutting region in a short period of time and the cutting root is frozen.

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Liaoning, China

Yuwen Sun