Titanium alloy artificial knee joint magnetorheological polishing device

Abstract

The invention relates to a titanium alloy artificial knee joint magnetorheological polishing device. The device has the characteristics that the device is high in magnetic current liquid utilization ratio, and uniform and consistent in polishing quality, and can polish a complicated curved surface, so that the device can meet the existing clinic requirement completely. A workbench is arranged at the lower part of a rack; a corresponding six-freedom-degree parallel machine tool is arranged above the workbench; a closed circulating magnetic current liquid loop is connected with a magnetic current liquid channel; the magnetic current liquid channel is placed on a support of the workbench; mounting holes of a titanium alloy prosthesis are formed below the magnetic current liquid channel; a sealing washer is mounted between the magnetic current liquid channel and the titanium alloy prosthesis; the titanium alloy prosthesis is fixed in a pressure rod; the six-freedom-degree parallel machine tool is connected with an electromagnet; the magnitude of the magnetic field intensity of a magnetic current liquid is controlled by adjusting a gap between the end face of the electromagnet and the surface of the magnetic current liquid channel, so that the magnitude of a cutting force of abrasive particles in the magnetic current liquid on the surface of a titanium alloy is controlled; and the six-freedom-degree parallel machine tool, the electromagnet and the magnetic current liquid loop are connected with a control device.

Description

technical field [0001] The invention relates to a magnetorheological polishing device for machining, in particular to a magnetorheological polishing device for a titanium alloy artificial knee joint. Background technique [0002] The titanium alloy artificial knee joint is an organ with joint function. As a result of war, disease, industrial injury, traffic accident, accidental injury and aging population, millions of human joints are damaged, resulting in pain, limited movement and instability. In my country, there are about 30 million people who need titanium alloy artificial knee implantation, of which the market for imported products accounts for about 1 / 4, and the main users are large and medium-sized hospitals, while the main users of domestic products are hospitals in relatively backward areas. With the development of science and technology and the improvement of people's living standards, it is expected that the demand for titanium alloy artificial knee joints will ...

AI Technical Summary

Problems solved by technology

[0009] (4) The thermal conductivity of titanium is small, which is 1 / 4 of nickel, l / S of iron, and 1 / 16 of aluminum

[0011] (6) The modulus of elasticity is small, the modulus of elasticity of titanium is E=108GPa, the modulus of elasticity of titanium alloy is lower than that of pure titanium, which is about 55% of that of steel, so titanium alloy is easy to produce elastic deformation

[0015] (3) It is easy to produce burn cracks. Due to the high grinding temperature, large thermal stress is generated on the grinding surface, not only prone to grinding burns, but also grinding micro-cracks

[0017] (5) The surface quality is not easy to guarantee. When titanium alloy is ground, harmful residual tensile stress and surface contamination layer are easily produced on the surface of the workpiece, and the surface roughness value is relatively large.

[0018] (6) Low production efficiency When grinding titanium alloys, the grinding wheel is prone to wear, passivation, adhesion and clogging, resulting in a very low grinding ratio

Titanium alloys are widely used in artificial knee joints due to their high strength and low modulus. However, there are defects such as poor machinability and low thermal conductivity in the surface finishing of titanium alloys, and the surface of titanium alloy artificial knee joints is mostly complex. Curved surfaces, currently the polishing of titanium alloy artificial knee joints is mainly done manually, and the polishing quality is difficult to meet clinical requirements

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