YDTech™ supplier of titanium balls with holes, hemisphere,hollow balls or half balls for Jewelry ! OEM of miniature tantalum beads in china.
The tantalum beads are then precision ground in several processes. These processes uses the same kind of machine which rolls the tantalum beads balls between two fixed plates, but in this operation, one plate contains abrasives. Finally, the tantalum beads are inspected.
precision tantalum spheres used for medical applications include balls or beads used as radiographic targets. these balls define the three dimensional position of an area of interest. the tantalum balls or beads are usually made of either gold or tantalum. the desirable properties there are good radiographic opacity and biocompatibility. tantalum balls of any desired size can be produced. these balls or beads require good sphericity and a well-defined diameter.
The next step in the production of the tantalum bead is to remove the ring from the tantalum bead blank. This process is called Flashing. The tantalum beads ball blanks are rolled between two hardened alloy plates under high pressure. The plates contain grooves in where the tantalum beads balls blank are placed. The tantalum bead ball blanks travel through the grooves, they spin and tumble until the rough edges are removed and the tantalum beads ball blank is squeezed into a more spherical shape.
tolerance level and technology of precision steel balls
| grades | Vdws | △Sph | Ra | Vdwl | Tdn | ||||
| 10 | 0.25 | 0.25 | 0.025 | 0.5 | * | ||||
| 16 | 0.4 | 0.40 | 0.032 | 0.8 | * | ||||
| 20 | 0.5 | 0.50 | 0.04 | 1 | * | ||||
| 28 | 0.7 | 0.70 | 0.05 | 1.4 | * | ||||
| 40 | 1.0 | 1.00 | 0.08 | 2 | * | ||||
| 60 | 1.5 | 1.50 | 0.10 | 3 | * | ||||
| 100 | 2.5 | 2.50 | 0.125 | 5 | +/-12.5 | ||||
| 200 | 5 | 5 | 0.2 | 10 | +/-25 | ||||
| 500 | 13 | 13 | * | 25 | +/-50 | ||||
| 1000 | 25 | 25 | * | 50 | +/-125 | ||||
| 440C hollow balls,titanium tantalum half spheres, tungsten balls,ceramic beads | |||||||||
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we have made tantalum balls or tantalum beads for medical applications, but there are no real size limitations, except the availability of the raw material. small quantities of some sizes of tantalum balls are available in stock.
hollow steel spheres. we have many different sizes available, all are 200 series steel and only 0.5mm thick. they have been polished so they are close to a mirror in their reflection characteristics.
The first stage in the tantalum beads process is heading. Tantalum beads ball blanks are headed from rolls of tantalum wire. A piece of tantalum wire is cut of in the heading machine and the tantalum wire piece is pressed in to a spherical shaped tantalum part, a tantalum ball or tantalum bead blank. Due to excess tantalum material the shape of the tantalum beads blank is similar to the planet saturn.
these small diameter, very precise closure balls are press fit into the openings of a medical device that is ultimately implanted into the human body. the compressive stresses imparted to the ball by press fitting it into an under sized hole lowers the melting temperature of these balls. this lower temperature melting point helps to localize the liquid phase to the area immediately adjacent to the site of the ball. The fusion, or melting, process usually incorporates a laser heat source. Closure balls are usually one millimeter in diameter, but they can be made in any diameter to suit specific applications.
in principle a tantalum bead is simple a tantalum ball. The Production of tantalum beads are similar to production of other metal spheres like e.g. a ball bearing balls and the concept has not changed for centuries. The process starts with tantalum wire and end up with a round tantalum beads.