At the CINCINNATI booth of IMTS2000, the Z3 composite spindle head designed and manufactured by DST of Germany was exhibited. The head uses a three-bar mechanism in parallel and in series. Due to the limitation of the parallel mechanism, the Z3 spindle head has a maximum inclination of only ±40°, so it can only be used for five-axis linkage, but not for five-sided machining.
In the past, in the case of five-sided machining of large parts, a two-column (gantry) machine tool and a replaceable vertical and horizontal spindle head (accessory head) were used. To this end, in addition to the tool magazine, this type of machine tool also needs a spindle head library. The beam is generally extended to the left side as a spindle ram for the spindle head. The five-face machining machine exhibited by Japan's New Japan Machine in the last IMTS is such a structure. In this exhibition, the method of exchanging the spindle head is no longer used, and the aforementioned composite spindle head is used. When the A (B) axis is locked at the 0° position, the horizontal plane of the workpiece can be machined. When the C-axis lock is locked at four 90° positions and the A (B) axis is locked at 90°, four mutuals can be realized. Vertical plane machining. Even with one such composite spindle head, 5-sided machining can be achieved. Since the C-axis can be locked at any angle, it is practical to implement more than four but more or less than four vertical planes. In addition, it has been mentioned above that the composite spindle head can also realize the shaft linkage machining, which makes the five-sided and five-axis machining can be realized on the same machine tool, and thus is another form of composite machining. This is advantageous for the processing of large molds. This type of machine also enables the machining of inclined faces and inverted taper holes (ie, the big head is down). Coincidentally, in this session of IMTS, in addition to the new Japanese machine, there are a number of companies exhibiting similar machine tools, the name is called "5-axis and multi-face machining" (5-axisand multimachining) machine tool, which is no longer called "five-sided machining" "The machine is out.
CNC machining to improve the network productivity of machine tools
It is not new to connect the CNC system to the Internet. However, in the past, the Internet was understood to transmit processing programs to the CNC system, especially large-capacity programs, to enable remote diagnosis and remote maintenance services. On the IMTS2000, the "ITplaza" (Information Technology Plaza, hereinafter referred to as "IT Plaza") exhibited by Okuma Machine Tool Co., Ltd., and the "CyberProductionCenter" exhibited by Mazak Corporation of Japan (Intelligent Production Control Center, below) Referred to as "CPC"), SEIKIFlexLink (soft machine flexible joint) exhibited by Hitachi Seiki Co., Ltd., "OpenFactoryCNC" (open factory CNC) exhibited by the United States Hardinge Machine Tool Co., Ltd. and GEFanuc two exhibition stands, and "Simens company advocated" OpenManufacturingEnvironmert (open manufacturing environment) and other emphasis on networking is to further increase machine productivity. Daxie said that only good machine tools and good CNC systems are not enough to adapt to the current fierce market competition. Only by "entering" their "IT Plaza" can they win in the competition. Mazak said that in the case of multiple varieties and small batches, a CNC machine actually only has 25% of the time cutting, creating value, while the remaining 75% of the time does not create value. They believe that it is only possible to increase the cutting time from 25% to 65% by networking the machines and connecting them to their CPC. Simens said that in order to maximize the utilization of the machine, it is necessary to install an Ethernet communication card and a factory intelligent network connection in the HMI (Human Machine Interface) of its numerical control system.
Mazak believes that the machine utilization rate is only 25% due to the following five factors.
1 programming, program editing and trial cutting.
2 Measure, input and manage tool data.
3 The machine tool has been re-adjusted due to changes in production schedules.
4 Report and monitor the number and operation of the machine tool to the superior.
5 Make decisions and find fixtures for the workpiece mounting method.
For the above five factors, the following four software modules are seamlessly integrated in the CPC.
1 plan scheduling module (Scheduler)
The best multi-variety parts processing plan is proposed through simulation. When the dispatch is inserted, perform a re-simulation of the change plan to find the best solution for scheduling. Resources can be optimized for rapid response without production disruption. In addition, the module collects and analyzes shop floor data.
2 fixture management module (ToolManagerment)
It makes the best application and cost of tools and fixtures the lowest. List the tools and fixtures for each type of workpiece.
3 machine monitoring module (MachineMonitor)
Monitor the operation of each machine online and easily monitor it remotely in the office or via the Internet.
4 programming and program optimization module (Camware)
Human-machine interactive programming and program optimization.
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