Processing characteristics of medical titanium and titanium alloys

Titanium has good biocompatibility, so it is selected as the most ideal human implant product. For more than ten years, many scientific research departments, medical schools, hospitals, etc. in various countries and China have also done a lot of basic work and clinical research, and have recognized titanium as the most ideal human implant product in depth and breadth. In recent years, titanium has been used in Thousands of cases of artificial femoral heads, artificial wrist joints, knee joints, artificially implanted teeth, skull repairs, cardiac pacemakers, etc. made of materials have been recorded. After years of scientific research, tracking, and comparison, titanium is the most popular among the reports so far. The most ideal product for human implants. The design of orthopedic devices needs to conform to the complex shapes of bones and joints, so the processing of these parts is also complex. These devices, machined from titanium rods, require significant amounts of material to be removed, making the process expensive due to the low machinability index of many materials. Therefore, some parts are cast to approximate the shape of the part, which often requires complex and expensive fixtures. titanium pipe / Grade 16 Ti-0.5Pd Titanium Tube / Gr3 Pure Titanium Tube

Titanium 6AL-4V ELI is a standard product used to make hip joints, bone screws, knee joints, plate-shaped bones or organs, dentures and surgical equipment. However, cobalt-chromium alloys will become more commonly used due to their strength, finer grain size, and cleaner nature than titanium. The cutting forces required to machine titanium alloys are only slightly greater than those required to machine steel. However, the metallurgical properties of titanium alloys make them more difficult to machine than steels of appropriate hardness. Titanium has a titanium work hardening property that eliminates solid metal (curling) in front of the cutting tool. This helps to increase the shear angle during machining, thus forming thin chips that contact the cutting tool surface over a reasonably small area. Because of this work hardening property, the feed should not be interrupted during the moving contact between the tool and the workpiece. The large supporting force generated during machining, combined with the friction generated by the chips in the contact area, results in a significant increase in heat in the tool area. The heat generated by 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 surface. The large bearing force and heat form craters near the cutting edge, causing the tool to be damaged quickly. To make matters worse, titanium alloys have a strong tendency to fuse with the products in the tool to form an alloy or to undergo chemical changes at the operating temperature of the tool. There is also a tendency that when chips adhere to the cutting edge of the tool, the surface of the tool will be damaged. damage. These difficulties are compounded when the tools begin to break, so tools used for machining titanium and its alloys should be carefully supervised to ensure that the edges are sharp and replaced before dulling. The experience of processing titanium and titanium alloys is that if you see any changes during the processing, you should change the tool immediately, because the change means that the tool will become dull. Another reason to keep your tools sharp is that titanium can cause a fire when cutting with broken or broken tools. When burned, the metal generates oxygen, so the fire ignites spontaneously. Therefore, many workshops that process titanium do not report fires. They equip machine tools with extinguishing systems.

Titanium has a moderately low modulus of elasticity and is more elastic than steel, so it will tend to resist cutting tools when machined unless it is to be cut firmly or used as a proper support. Slender parts tend to deflect under tool pressure, leading to problems with tool chatter, tool friction and work errors. Through processing experience, it is believed that the rigidity of the entire tool system is very important, and sharp, accurate-shaped tools must be used. As a result of these pressures, new technologies have been introduced to help shops manufacturing medical parts cope with competition. Machining performance produces these complex parts with very high precision. Many innovations in EDM have enabled the production of high-quality parts faster and eliminated many older machining technologies. problems inherent in it.

As a new product, titanium has only been developed and used in China's pharmaceutical industry, medical equipment, human implants and other fields for nearly two decades. However, it has achieved great success and achieved significant social and economic benefits, shortening the gap between China and international advanced countries. The use of titanium equipment in the production of many products not only solves the equipment corrosion problem that seriously plagues the company's production and development, but also greatly improves the quality of drugs.