Increase the production with the technician of mechanised optimum

To manufacture internal threads in the engine, in his zones of fixation and in the train of transmission, can employ any variety of technician. Choose the correct depends of the size of the batch and of the material, of the machine used and the requirements for the screw, such as if the thread has to finish near of the bottom of the hole or if the beginning of the thread has to have a complete turn of profile.

An alternative to the conventional process of threaded with male is the milling of threads. Both technicians involve the cut of the material.

Another option is the threaded by laminación, a process in which the material is displaced more than deleted. Like result of this, do not exist problems of evacuation of shaving. The threads produce without breaking the fibres of the material, the surface of the thread compact and obtains a better finished that with the threaded with male. Under static load, the resistance of the thread effected by laminación is identical to the one of a thread effected by cutting (male or strawberry of roscar), but has greater resistance under a dynamic load. For this reason, the laminado of threads (if it is feasible given the ductility of the material) has showed to be a popular technician for the points of fixation that subject to high loads.

The threaded with male of cutting or of laminación is compatible with all the machines. The milling of threads, however, requires a machine CNC able to effect helicoidal interpolations. During this process, the threads of thread create in a circular movement, with the tool displacing axially the value of once the step of thread. In the process, the strawberry of roscar enters in the previous hole exactly to the depth of thread programmed, does not exist the rebasamiento typical with the threaded conventional, since, in contrast with the males (so much of cut as of laminación), the milling cutters of roscar do not have chamfer of entrance. This means that the milling of threads can produce a thread until the bottom of the hole, without need of secondary operations. Besides, can mechanise different tolerances with the same tool, or different diameters with the same step. Also it achieves a superficial finishing of greater quality. If the machine is able to offer high speeds of rotation, can attain a considerable saving of time in big threads or in aluminium. Short shavings and adjustable threads to the instant and repetitive help to ensure a process of threaded reliable.

Another advantage is that the relatively big threads can mill finishing directly the internal diameter. Virtually, can mechanise all the materials and the tools are reafilables.

In big batches, the pieces mechanise often in lines transfer, what limits the options of manufacture to the threaded with male. Here, there is usually units of basic advance in the stations of mechanised individual, connected in series or in a loop. While in the past used male of fast steel, at present tend to be manufactured in hard metal. These males have an useful life considerably longer, what allows a saving of costs, owed no only to fewer changes of tool but also to lower time of unemployed machine.

Other tools that are very attractor trucks from the punto of the design, are male of laminación like the variants JEL MOREX with insertos of hard metal soldered. With JEL MOREX R, the insertos are even interchangeable. They are some popular tools no only by the qualities described further up, but also because they have of a mango in HSSE. This is able to compensate the errors of alineación, while the material of cut in hard metal provides a life of tool extremely long. In this type of machines, where the errors of position tend to occur, since taladra in a unit and thread in another, the life of the tool can increase with grow.

In contrast with the production in series, the mechanised of components, in particular in the sector of the automotive sector, has come being marked increasingly by a considerable variety of models and cycles of innovation faster. This, to his time, has carried to the decrease of size in the batches of manufacture. At the same time, the wish to reduce the times of cycle has generated demand of machines increasingly fast, with speeds of greater twist. Besides, the modern designs of the components impose demands every time greater on the properties of the threads and the form in that they produce . Like the walls of the pieces go back increasingly thin, the effective depths of the threads have to increase or the threads have to manufacture without the typical rebaba to the entrance. There are special challenges that present specific or technical materials of mechanised, like the mechanised with minimum quantity of refrigerante or in dry. The tendency, therefore, is to the production in machining centres CNC, that can be used like independent machines or joined to form a chain. With these machines is possible to implement and explode the technology of milling of threads and all the advantages that offers. The previous requirement for this, however, is that the machine has to be compatible with the helicoidal interpolation. Nowadays, this characteristic is available in the majority of machines and, in the isolated cases in which it is not it, simply has to be activated. These machines also allow the use of tools combined, that can execute operations no only axial, but also circular, offering the possibility to llevar so many tasks as it was possible with an alone tool.

The Group Komet offers two types of milling cutters of roscar: milling cutters JEL MKG (without chamfer) and milling cutters JEL MGF (with chamfer). Like tools of hard metal, are apt to work all the materials. With insertos of PKD soldered, are optimised for the mechanised of aluminium. The milling cutters of roscar JEL TOMILL (GWF) are designed for greater threads, from 20 mm. The tools of hard metal combined for taladrar and mill threads produce a complete thread in an alone operation, taladrando the inner hole with a chamfer of 90° and afterwards milling the thread.

For the use in diverse materials, these tools combined are available in integral hard metal, without recubrir or recubiertas or in version PKD. The tools also can design to be compatible with minimum quantity of refrigerante (MQL). A version of 3 edges of cut is available specifically to mechanise holes with the taladro already previously opened of smelting in aluminium.

The tool DBGF has a special geometry and is a tool purely of milling circulate, that creates so much the central hole like the filete of thread gone back to turn simultaneously. With his greater transversal section, DBGF is an ideal tool for deep threads until 3xD, in the rank of 6 to 12 mm of diameter.

Like part of the general technical advances, the mecanizadores confront to increasing quantities of materials in aluminium. To mechanise these materials, the edges of cut would have to instrument preferably with PKD. The polycrystalline diamond allows the cut of high speed (HSC), what also generates a big potential in the development of machine in terms of increase of the available maximum speed.

The tools combined of taladrar and mill threads use often like central tool in systems of tool JEL VABOS (variable system of milling, avellanado and milling of threads). These systems of modular tools are adapted for multiple uses and, in addition to milling of threads and taladrado and threaded combined, offer combinations for laminado and chaflanado in the same operation. The systems comprise a setting with central tool and a disposal of plaquitas of reversible cutting.