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Analysis of Milling on a grinding machine
When the word "multitasking" is applied to machine tools, the term refers usually a machine that is capable of running both and milling. This definition is fine as far as it goes. However, turning and milling operations are two very similar. They use a point to a chip, and both are approximately the same stage in a production process. If the argument for multitasking has to do with the reduction of both the delay and potential errors that come from other parts of the transport between different machines, then the argument of force increase if the multitasking machine can be combined operations that are more distant from each other in the production process.
For example, combining milling and grinding?
Of milling, of course, is generally regarded as a finishing operation. Grinding is the removal of a package of actions. In many plants, these two operations carried out in different places. In an even larger number of plants, which are made by different employees with different skills. The combination of the two operations does not seem an obvious choice.
However, some profile grinding machines have developed in the direction of this kind of multitasking, even when combined the operations was not necessarily the goal. The photo-TC multifunction machine grinding Magerle (represented in the United States by United Grinding Technologies, Miamisburg) is an example. To support a growing role for creep feed grinding (a process of metal removal and grinding high only until the end) This machine has a line of powerful and hydrostatic drive means. In addition, because the types of conventional abrasive wheels, vitrified CBN CBN-plated and they all excel at different applications, the machine was equipped with the ability to store different wheels and automatically change them.
The latter feature is based on proven technology. Specifically, based on an arm like toolchange a machining center with tool holder (or wheelholders in this case) using HSK tool interface is the owner of a machining center. Taken together, change the machine tool, the spindle power and stiffness to produce the equivalent of a machining center for high performance. Heavy precise grinding can be performed on this machine and the milling and drilling tools can be stored in the warehouse with wheels.
Milling small
Chris Stine is vice president of United Technologies grinding. He said the performance chip operations, as milling and drilling on a grinder is better suited to certain types of parts. It also requires a particular mood in production.
Some benefit from milling or drilling on a grinding wheel, the cycle must consist of more than grinding. The MFP-TC machine mentioned above is a first mill on all with an accuracy beyond what could be associated with a machining center, even high-end, he said. As a result, the machine can not compete economically against a center of metal working, so traditional is the main work.
However, shares many airlines have a small but critical amount This metal cutting. Even on a milling machine equipped with multiple wheels and capable of high metal removal rates, there are many features that simply can not be crushed. Holes, pockets and slots that do not work at all the room are examples. When the piece has one or more functions such as these, the application of these cuts in the mill can save significant costs by eliminating the need to develop on multiple machines. This is especially true for parts such as profiles, which the position of plants can be defined in relation to surfaces with complex geometries.
Another argument in favor of building operations refers to the size of the room. Amplify a large portion of the savings of floor space that could result from the combination of grinding and machining center on a single machine. The economics of work could also be more significant. Most, the best to put it in one place.
For such pieces large, such as jaw crusher, crusher, stone crusher, milling machine, rock crusher, mill, etc Stine says that the range of operations to include the potential turning point. A dish that can be rotated at 70 revolutions can provide 1500 sfm cutting speed of a turning tool that cuts a diameter of 7 meters. This is exactly the solution of the gas turbines GE (Greenville, South Carolina) adopted by the wheels of machining large turbines. Parties used to be machined in a mill, lathe and vertical mill now receive all the boring machine in a machine tool Magerle. The change of guard around 6 hours of installation time and two days of long tail, according to engineers at the factory. In general, there was a 30 percent reduction in cycle time.
Process perspective
These savings to overcome the fact that multitasking mill is unlikely to be profitable at the time of milling and turning as isolated operations. OK This apparent inefficiency in the cycle machining, for the sake of a more efficient process in general, is part of the proceeds from the effective implementation of these machines.
Different organizations have different production costs and the need for this process of perspectives through part of the reason for identifying good applications for these machines are not necessarily cut and dried.
A traditional manufacturing mindset look at the features of a room and see the machine tool tolerances including the most suitable for producing all this geometry. This perspective focuses on one party can maximize the machining time and machining costs, but may do so at the expense of less easily quantifiable costs associated with managing the game.
Stine said, a different mentality focuses on a particular unit cost. The room should be produced to meet a certain price, after all costs within and outside the machine tool is taken at this point of view, the efficiency with which machining each function is less important as long as the process is most effective. The latter view, he says, is the most likely to make the heritage of the machines in a variety of different tools alone.
Turning on a grinder
"It is difficult turning "usually refers to the rotation of the workpiece to the Rockwell C hardness values ββin the range of 50 to 60. usually is a tool cutting round material stiff and hard as PCBN. The S242 machine Studer (United Grinding Technologies represented by) is the company's latest machine capable of OD grinding and hard turning in a single cycle.
John Richard, Director of Sales for Studer, explains why the two are complementary. If the tolerance is sufficiently tight, he said, turning is not enough. An insert size change slowly rotated while the inclusion of the cuts, which affect the precision machining and finishing. A grinding wheel is continuously renewed after the machines, but this is not the case of an insert of rotation.
On the other hand, the insertion of rotation can provide a performance advantage as the grinding wheel can not. If the heat treatment introduces variations in the geometry of a rotating part and a wheel to start to find the highest point of the room at all times. The grinding cycle can vary. However, a turning insert can withstand a depth of cut slightly good start machining the same diameter at each moment, to make the machining time consistent from one room to another.
About the Author
David ZHENG is the CEO of http://www.grinding-mill.com . A company specialized in selling all kinds of engineering machines such as jaw crusher,grinding mill,stone crusher,milling machine,rock crusher,crusher etc.
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