Sui Menghua

Bio: Sui Menghua is an academic researcher from Qingdao University. The author has contributed to research in topics: Nozzle & Milling cutter. The author has an hindex of 3, co-authored 11 publications receiving 69 citations.

Temperature of Grinding Carbide With Castor Oil-Based MoS2 Nanofluid Minimum Quantity Lubrication

Abstract: Nanofluid minimum quantity lubrication (NMQL) has better stability, higher thermal conductivity, and excellent lubrication performance compared with traditional flood lubrication. The heat transfer model and finite difference model were established to verify the feasibility of NMQL conditions in grinding cemented carbide. Based on them, the grinding temperature of cemented carbide is calculated numerically. Results show that the grinding zone temperatures of flood grinding and NMQL are lower, 85.9 °C and 143.2 °C, respectively. Surface grinding experiments of cemented carbide YG8 under different working conditions are carried out. Dry grinding (227.2 °C) is used as the control group. Grinding zone temperatures of flood grinding, minimum quantity lubrication, and NMQL decrease by 64.2%, 39.5%, and 20.4%, respectively. The error is 6.3% between theoretical calculation temperature and experimental measurement temperature. Based on machining process parameters (specific grinding force, force ratio) and experimental results (microstructure of grinding wheel, workpiece, and grinding debris), the effects of different working conditions on wheel wear are studied. NMQL achieves the highest G ratio of 6.45, the smallest specific grinding force, and the smallest Fn/Ft ratio of 2.84, which further proves that NMQL is suitable for grinding cemented carbide.

Minimum quantity lubrication multi-freedom-degree intelligent spray head system based on CNC milling machine

Abstract: The invention discloses a minimum quantity lubrication multi-freedom-degree intelligent spray head system based on a CNC milling machine. The system comprises a CNC milling machine system connected with a nozzle multi-directional movement system and a nozzle angle automatic adjustment system. The nozzle multi-directional movement system comprises an XZ face rotation mechanism, a Y-direction movingmechanism and an X-direction moving mechanism. A nozzle is mounted on the X-direction moving mechanism and is further connected with the nozzle angle automatic adjustment system. The X-direction moving mechanism is used for driving the nozzle to move in the direction X. The nozzle angle automatic adjustment system is used for adjusting the angle of the nozzle. Under drive of the Y-direction moving mechanism, the X-direction moving mechanism can move in the direction Y along the Y-direction moving mechanism, and therefore X-direction movement of the nozzle is achieved. Under drive of the XZ face rotation mechanism, the X-direction movement mechanism can do XZ face rotation movement along the XZ face rotation mechanism, and therefore XZ face rotation movement of the nozzle is achieved.

Three-axis linkage platform based intelligent spray head system for minimum-quantity lubrication of numerical control horizontal lathe

Abstract: The invention discloses a three-axis linkage platform based intelligent spray head system for minimum-quantity lubrication of a numerical control horizontal lathe. A transverse moving portion is connected with a longitudinal telescopic portion to supply required power to transverse movement of the longitudinal telescopic portion, so that the longitudinal telescopic portion can move horizontally. Arotary portion is arranged in the longitudinal telescopic portion to enable the rotary portion to move longitudinally, is connected with a three-axis linkage platform and drives the three-axis linkage platform to rotate. Spray heads are arranged on the three-axis linkage platform, and detection devices are arranged on the spray heads. The transverse moving portion, the longitudinal telescopic portion, the rotary portion and the three-axis linkage platform are adjusted according to temperature data detected by the detection devices, so that the spray heads can achieve continuous tracking spraying when the horizontal lathe is used for machining. The three-axis linkage platform based intelligent spray head system for minimum-quantity lubrication of the numerical control horizontal lathe solves the problems of blind angles of cut surfaces and cutting fluid waste, and the spray heads can achieve continuous tracking spraying when the horizontal lathe is used for machining.

Milling cutter device for assisting chip breaking and milling cutter system for assisting chip breaking under different lubricating conditions

Abstract: The utility model discloses a milling cutter device for assisting chip breaking and a milling cutter system for assisting chip breaking under different lubricating conditions. The milling cutter device capable of assisting in chip breaking solves the problem that in the prior art, long chips influence the surface quality of a workpiece, has the beneficial effects of being capable of achieving chipbreaking and wide in application range, and adopts the scheme that the milling cutter device capable of assisting in chip breaking comprises a cutting mechanism for cutting the workpiece, and the cutting mechanism is arranged above the workpiece; the tool magazine mechanism comprises a first rotating mechanism and a plurality of tools connected with the first rotating mechanism; and the tool changing mechanism comprises a second rotating mechanism and a mechanical arm connected with the second rotating mechanism, the tool changing mechanism is arranged between the tool magazine mechanism andthe cutting mechanism, and the mechanical arm can move to select tools from the tool magazine mechanism and clamp the tools so as to cut off cuttings generated when the cutting mechanism cuts the workpiece.

Multi-degree-of-freedom micro lubricating intelligent spray head system for CNC milling machine

Abstract: The invention discloses a multi-degree-of-freedom micro lubricating intelligent spray head system for CNC milling machine. The multi-degree-of-freedom micro lubricating intelligent spray head system comprises a ring-shaped rotary table, a longitudinal telescopic part, a rotary part, an intelligent spray head mounting table and an information acquisition system, wherein the ring-shaped rotary tablecomprises a rotary part which rotates in the horizontal peripheral direction; the bottom of the rotary part is connected with at least one longitudinal telescopic part; the lower end of the longitudinal telescopic part is connected with the rotary part; the rotary part takes a connecting point of the longitudinal telescopic part as a shaft center, and rotates within a set angle range; the intelligent spray head is connected with the rotary part and moves along with the rotary part; and the information acquisition system is mounted on the intelligent spray head mounting table. The angle of thespray head is reasonably regulated through processing data, and a gas-liquid ratio is reasonably set, so that a processed workpiece is sprayed by the spray head with a reasonable angle, the defect that a conventional cutting fluid spray head is fixed and is limited in spraying angle is solved, and the problem that a cutting surface has a dead corner and cutting fluid is wasted is solved.

Biological Stability of Water-Based Cutting Fluids: Progress and Application

Abstract: Abstract The application of cutting fluid in the field of engineering manufacturing has a history of hundreds of years, and it plays a vital role in the processing efficiency and surface quality of parts. Among them, water-based cutting fluid accounts for more than 90% of the consumption of cutting fluid. However, long-term recycling of water-based cutting fluid could easily cause deterioration, and the breeding of bacteria could cause the cutting fluid to fail, increase manufacturing costs, and even endanger the health of workers. Traditional bactericides could improve the biological stability of cutting fluids, but they are toxic to the environment and do not conform to the development trend of low-carbon manufacturing. Low-carbon manufacturing is inevitable and the direction of sustainable manufacturing. The use of nanomaterials, transition metal complexes, and physical sterilization methods on the bacterial cell membrane and genetic material could effectively solve this problem. In this article, the mechanism of action of additives and microbial metabolites was first analyzed. Then, the denaturation mechanism of traditional bactericides on the target protein and the effect of sterilization efficiency were summarized. Further, the mechanism of nanomaterials disrupting cell membrane potential was discussed. The effects of lipophilicity and the atomic number of transition metal complexes on cell membrane penetration were also summarized, and the effects of ultraviolet rays and ozone on the destruction of bacterial genetic material were reviewed. In other words, the bactericidal performance, hazard, degradability, and economics of various sterilization methods were comprehensively evaluated, and the potential development direction of improving the biological stability of cutting fluid was proposed.

Influence of texture shape and arrangement on nanofluid minimum quantity lubrication turning

Abstract: Due to the stringent requirements of carbon emissions, traditional cutting using a large amount of mineral-based metal cutting fluid for lubrication no longer fulfilled the rigorous requirements of policies and standards. Nanofluid minimum quantity lubrication has been proven to be a new process to achieve clean manufacturing. However, due to adhesive contact friction, lubricant droplets cannot effectively penetrate the tool and workpiece interface during continuous turning. Changing the microstructure of the rake face of the tool, such as the micro-texture, may provide a geometric channel for the diffusion of the lubricant. However, the effects of micro-texture geometry and arrangement on the film formation and tribological properties of droplets have not been revealed yet. The spreading behavior of minimum quantity lubrication atomized microdroplet on the textured surface was calculated by hydrodynamic modeling. It was proven that the microchannel can effectively store the lubricating medium atomized by compressed air pneumatics. Furthermore, a comparative experiment was conducted on the influence of the texture arrangement on the cutting performance through the turning experiment. Results show that the microgrooves in the direction perpendicular to the main cutting edge obtained the lowest cutting force. The feed force, radial force, and tangential force were reduced by 13.46%, 16.23%, and 6.34%, respectively. Meanwhile, the texture arranged parallel to the cutting edge and crosswise increased the cutting force. The arrangement of the texture perpendicular to the main cutting edge direction obtained the optimal workpiece surface, the smallest chip curling radius, and the smoothest chip surface. Under the optimized texture arrangement, the anti-wear and anti-friction properties of nanofluids in the cutting area are enhanced.