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Processing characteristics of medical titanium and titanium alloy

Titanium has good biocompatibility, so it is selected as the most ideal human implant.International countries and more than a decade, China's many research part, medical school, hospital, etc, the warp and woof of also made a lot of work and clinical research, from the depth and breadth of titanium admitted to the ideal implantable products, over the years made of titanium artificial femoral head, wrist, knee joint, artificial cultivation of teeth and bone repair, such as cardiac pacemaker, thousands of cases over the years of scientific research, stalking, contrast, reported so far in the titanium is the most ideal products medical implants.Orthopedic devices are designed to fit the complex shapes of bones and joints, and the processing of these parts is complex.These devices, made from titanium rods, require the removal of a large amount of material, thus making the process expensive due to the low cutting performance index of many materials.As a result, some parts are cast into near-ultimate shapes, often requiring complex and expensive fixtures.

Titanium 6al-4v ELI is a standard product for hip joints, bone screws, knee joints, plate bones or organs, dentures and surgical devices.Cobalt-chromium alloys, however, are increasingly used because they are stronger, more granular and cleaner than titanium.The cutting force required to process titanium alloy is only slightly greater than that required to process steel, but the metallurgical properties of titanium alloy make it more difficult to process than steel of proper hardness.Titanium has a work hardening property that eliminates the consolidated metal (crimped edge) in front of the cutting tool.This helps to increase the shear Angle in machining, thus forming a thin chip that touches the cutting tool surface in a suitably small area.Because of this work hardening, feed should not be stopped during the tool and workpiece motion touch.This large supporting force, combined with the friction caused by the chip in the touch area, causes the heat in the part of the tool to be added greatly.The heat from cutting titanium does not dissipate quickly because it is a poor conductor.Therefore, most of the heat is concentrated on the cutting edge and tool appearance.Large bearing force and heat, in the cutting edge near the formation of crescent depression, resulting in tool agility damage.To make matters worse, titanium alloys at the operating temperature of the tool have a strong tendency to fuse with the product in the tool or to undergo chemical changes, and there is a tendency to cause apparent damage to the tool when the chip is bonded to the cutting edge of the tool.These difficulties are compounded when the tool begins to break, so tools used to process titanium and its alloys should be carefully monitored to ensure that the blade is sharp and replaced before being blunted.The experience that processes titanium and titanium alloy is, if in processing process, see any change, should change knife immediately, because change means tool should become blunt.Another reason to insist on sharp cutting tools is that titanium can cause fire when cutting with broken or damaged tools.When burned, the metal produces oxygen, so the fire ignites spontaneously.Therefore, many titanium processing workshops do not report fire, they are equipped with machine tools to save the system.

Titanium has an appropriately low modulus of elasticity, which is higher in elasticity than steel, and therefore tends to violate cutting tools in processing unless they are machined solidly or used as appropriate support.Slender parts under tool pressure tend to deflect, resulting in tool chatter, tool friction and poor workmanship.Through the processing experience that the rigidity of the whole system of the tool is very important, to use sharp, accurate shape of the tool.As a result of these pressures, new technologies are being introduced to help the workshops that make medical parts cope with the competition.Many innovations in edm enable faster production of high quality parts and eliminate problems inherent in many older machining techniques.

As a new kind of product, titanium has been developed and applied in China's pharmaceutical industry, medical devices, human implants and other fields for only about 20 years.However, it has achieved great success, and achieved significant social and economic benefits, and shortened the gap between China and the international advanced countries.The application of titanium equipment in the production of many commodities not only dealt with the corrosion of equipment that seriously troubled the production and development of the company, but also greatly improved the quality of medicines.

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