DEEP HOLE DRILLING INSERTS,LATHE MACHINE CUTTING TOOLS,CARBIDE INSERTS

DEEP HOLE DRILLING INSERTS,LATHE MACHINE CUTTING TOOLS,CARBIDE INSERTS,We offer round, square, radius, and diamond shaped carbide inserts and cutters.

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Testing Measures Impact of Toolholder Interface Rigidity

Big-Plus and HSK are superficially similar in some ways. Both of these machining center spindle-and-toolholder interface systems aim to provide a more stable connection than Indexable Threading Insert the typical machining center system employing standard conical toolholders. And both of these systems are roughly equal in price when it comes to purchasing a set of toolholders for a machine. But Cory Cetkovic, applications engineer for Big Kaiser Precision Tool, says the two interface systems actually differ fundamentally in their method of clamping the holder. That difference has important implications.

The Big-Plus system involves elastic deformation of the spindle connection, he says. During clamping, that deformation results in axial displacement of the toolholder into the spindle. Prior to clamping, the toolholder makes only taper contact within the spindle, but after clamping of the retention system, the spindle expands within an elastic limit until the toolholder achieves the second area of contact—contact at Cutting Carbide Inserts the spindle face—that is the defining feature of the Big-Plus system.

HSK, meanwhile, works by elastically deforming the toolholder. Fingers inside the hollow shank of the toolholder clamp the holder by pushing out. High spindle speed helps this interface, because the centrifugal force strengthens this clamping.

In large part because of this very different clamping, these two systems are not equivalent, says Mr. Cetkovic. Big Kaiser supplies hardware for both, including Big-Plus tooling manufactured by Big Daishowa Seiki, the originator of the concept, and HSK toolholders that are hard milled, hard turned and ground after heat treatment for precision, surpassing that of commodity holders. Thus, the company often advises shops considering new machine tools on which toolholder interface to select. The choice depends on the application, he says. It also depends partly on the wishes of the user.

For example, the notion that a set of toolholders for either system is roughly equal in price, while outwardly true, masks a source of savings with Big-Plus that might be important to a given shop. Big-Plus is the system that adds spindle face contact for heightened rigidity to a toolholder interface that otherwise uses the same 7:24 cone of CAT and BT tapers. As a result, standard CAT and BT holders can be used in a Big-Plus machining center, and Big-Plus holders can be used in standard machines. Though the face contact is not realized in either of these cases, a given shop might prefer the Big-Plus system’s freedom to use existing, standard holders in cuts for which the rigidity doesn’t matter.

Testing at Big Kaiser has measured what this rigidity means and what performance it seems to delivers within the range of applications most favorable for this system. Machining tests with a 12-mm four-flute carbide end mill were run on two identical machines (same make and model), one equipped with Big-Plus and the other with HSK. On each machine, the workpiece was milled at various tool overhang lengths to measure the maximum axial and radial depths of cut at which the tool would perform effectively. The graphs on this page show the depths of cut at which chatter set in for each set of parameters. No doubt the different natural frequencies of the different toolholder systems contributed to how deeply a given tool setup could cut without chatter, so clamping stiffness alone isn’t the whole story. Still, at nearly every test run, the Big-Plus system provided for the capacity to take a deeper cut.

But results such as these do have a speed limit, Mr. Cetkovic says. It is the shops moving into higher spindle speeds that ought to consider HSK, partly because of the toolholder’s lighter mass, and partly also because of the very fact that the toolholder in the HSK system deforms rather than the spindle. Again, high rotational speed helps the clamping of this interface.

At around 24,000 rpm, he says, the centrifugal force’s relaxation of the connection for a conical holder, combined with that same force’s strengthening of the HSK clamp, results in the rigidity advantage crossing over to favor HSK from that speed up.


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Automobile Manufacturing Process And CNC Equipment

With the continuous increase of the automotive industry market and the advancement of equipment, the automotive industry and CNC machine tools naturally have an indispensable relationship. We all know that the automobile industry can be said to be one of the industries that will always progress and will not reduce the market value and production Carbide Grooving Inserts quality. Whenever a newly developed product has a great feature, it used to take a long time to develop a car. The product has been completed in the shortest time so far. The most important thing is thanks to the approval of equipment suppliers. It is these equipment suppliers who provide various CNC machine tools. These CNC machine tools can meet market demands with the fastest production speed and highest efficiency.

Whether it is professional or practical, we can see the important role and significance of CNC machine tools clearly, which can be seen from its classification and characteristics. It mainly includes the following classifications: from the classification of processing varieties, it can be divided into CNC milling machines for processing shells, machining centers, turning centers, and CNC lathes with processing shafts; from the general category, it can be divided into special and general CNC machine tools; From the driving mode, it can be divided into stepping motors, DC servo motors, linear motors, etc.; from the spindle drive can be divided into DC spindle motors, AC spindle motors; from the position response mode can be divided into semi-closed and fully closed loop response. CNC machine tools have the characteristics of high machining accuracy and excellent flexibility, and have been paid attention to by the automobile manufacturing industry for a long time. In a very early period, the development of auto parts consumption required a very high expenditure. In addition, the system functions and efficiency were not ideal. Obviously, the maximum universal application range was not obtained. It entered the 1990s. , Slowly introduced CNC machine tools, and the manufacturing unit with it as the main body was widely used in the automobile industry. However, today's CNC machine tools are mainly developed to the high speed, and the high speed is used to improve the high Cermet Inserts efficiency work.

Therefore, in the scope of world's auto parts manufacturing, the use of CNC machine tools is becoming more and more common. However, from the perspective of the varieties of CNC machine tools, the number of low-level CNC machine tools is still the most. There are very few varieties of multi-axis CNC machining centers for gearboxes, chassis and other major auto parts, and most of them have no conceptual ideas of production and consumption.


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