Mechanised of pieces for the medical industry: new developments that increase the performance

The growth of the production of big volumes of long and thin screws in metals of high performance, like the osseous screws, evolves in parallel to the competitive pressesure of his manufacture. This is the typical case of the providers of the medical industry, where the osseous screws, for example, mechanise in volumes every time greater and for which the threaded with cabezal giratorio is an already strengthened method. The inherent stability of the process turns it into the method indicated for the mechanised of big volume and of demanding metals.

The main advantage is a greater useful life of the tool, what involves less time of inactividad of the machine during the process of production. Besides, the robustness of the line of the edge of cut can be optimised to achieve edges more acute and reliable. Take out party of the advances in other areas of mechanised, and develop milling cutters and plaquitas interchangeable specific for the threaded with cabezal giratorio of small pieces, offers big advantages in the economy of manufacture of the medical components.

The developments in plaquitas have provided the half necessary to achieve a new concept of edges of cut, that takes out an elder split of the profits of the threaded with cabezal giratorio. The plaquitas of hard metal with coating, for example, offer useful lives longer and predictable, as well as the possibility to reach greater speeds of cutting. This has resulted in greater productions and in more pieces mechanised inside the levels of tolerance and finishing required. The new qualities of the plaquitas, as those that have of coating of PVD/TiAlN, present a genuine and fine layer of coating with an excellent adherencia to the sustrato of the plaquita. The quality has showed to be especially advantageous for the acute necessary edges for the threaded with cabezal giratorio of materials like the employees in the osseous screws.

The operative hygiene and the handle of the tool are additional essential characteristics to achieve a greater performance in the threaded with cabezal giratorio. The precision of the tool determines the quality of the accommodation of the plaquita, the rectified of the plaquita and the ease and reliability of the correct location of the same at all times. The subjection of plaquita recently developed for the milling cutters of threaded with cabezal giratorio has improved the precision of the positioning of the edge of cut, the hygiene of the mechanised, and the ease and the time of change of the tool. Likewise, to guarantee the high precision and the necessary superficial finishing during the process, requires a soft action of tangential cutting.

Nowadays, in the threaded with cabezal giratorio, the milling cutters would have to include plaquitas special rectified of big precision and the proformas would have to be compatible with the majority of the types and marks of husillo of cabezal mobile. In spite of treating already of a process of production of big volume, satisfy a greater production and the new exigencias of the pieces require of the new technology of tools, for like this achieve concepts of ring more advanced in the threaded of cabezal giratorio.

In an example of manufacture of threaded with cabezal giratorio of osseous screws, with volumes of around half million to the year, in small batches miscellaneous, install the tool of plaquita interchangeable modern resulted in savings of mechanised that increased considerably the competitiveness of the manufacture. The prolonged useful life of the new tool allowed to mechanise nueve times more components before having to change the edge of cut, when the dimensions of the piece began to go out of the requirements of tolerance. In addition to deleting the time of stop of machine, the ease of maintenance of the strawberry saved long in the chamber of tools.

The supply of refrigerante available in the machines of cabezal mobile current offers new possibilities for a production optimised of small pieces. Substitute the conventional flow of refrigerante in the zone of mechanised by a system of refrigerante of high pressesure offers a lot of advantages of mechanised. Besides, the introduction of this half assisted of cutting does not have why involve installations complicated and elaborated, since for this exists standard tooling and the supply of refrigerante inner is already a very usual practice. In the last years, the mechanised with refrigerante of high pressesure has gone developing of continuous form, resulting in the efficient current concept. The big advantage of this system resides in the optimisation of the performance and of the evacuation of shaving when mechanising demanding materials, from the punto of the control of shaving, like steels of low content in carbon or superaleaciones.

The application of a concept of tool to direct with precision the chorros of refrigerante of high pressesure to the zone of cut is now also available for the mechanised of small pieces. The current solution combines the chorros of refrigerante precisely directed with a system of simple subjection and sure. This opens new doors for the mechanised efficient of demanding materials, especially in the machines of cabezal mobile, where the groups of small tools find in spaces very reduced and whose change and reglaje is slow and complicated. So much the mechanised like the change of tool optimise with the new system tool holders, instrumented with location, system of blockade and connections for the refrigerante, in the machine.

The tool of turning with refrigerante of high pressesure, usually, has of three filters that direct the chorros of refrigerante to the most necessary zones. The refrigerante affects to the distribution of the heat generated in the zone of cut, to the wear of the tool, to the learning of the shaving and to the quantity of embazado of the material of the piece in the edge of cutting. The chorros of refrigerante reduce sure enough the length of contact, forming one coins hydraulics between the face of the shaving and the face of inclination in the edge of cutting. This affects so much to the life of the tool as to the learning of the shaving. The control of shaving in the machine allows a safe production, without hand of work, of pieces adjusted to the levels of superficial finishing and necessary tolerance, and results in a productivity of manufacture optimised.

The system of refrigerante of high pressesure is easy to apply in a machine of mechanised of small pieces and the tools can change quickly. This is due to the subjection and release of the tool holders with a simple screw and one coins by elastic effect that ensure the support to the stick of the tool. The precise positioning and sure of the edge of cutting obtains during the change and the reglaje of the tool holders. In combination with the supply of refrigerante inner in the support, and a simple and safe connection between the support and the stick of the tool, the mechanised without complications of demanding materials of long shaving has turned into a half of easy acquisition for the mechanised of small pieces in the medical industry.

The mechanism of an alone screw of the tool holders of fast change QS HP usually reduces the times of change of tool to a third of the usual time, of three to a minute. You coin them of subjection guarantee the fast and safe extraction equipment equipment of the tool and reduce the risk to leave it fall during the manipulation. Once in the machine, the position of the edge of the plaquita adjusts automatically by contact between the short support and the tope. Thanks to a half reduction of 30% of the movement of the tool, during the operations of frontal and reverse turning, the safe positioning of the edge of the plaquita will optimise considerably the precision of the operation.