EBy has adopted a double table structure on the gantry machining center of its processing workshop, so that it does not need to stop the spindle operation of the machine tool during the workpiece exchange process. The operator can safely install and commission a new work piece on a workbench outside the work area of ​​the machine, while the machine tool can mill work pieces that are held on another workbench. When the spindle of the machine tool is idling, it is impossible to obtain benefits for the production plant. For this reason, the processing shop always has to do everything possible to reduce the parts exchange time during the operation of the parts and the loading/unloading/commissioning time of new parts. Figure 1 When another engine block is being milled in the machine's sealed work area, the operator has already firmly clamped the engine block to a table outside the machine tool, which can greatly reduce the workpiece exchange. Spindle downtime Martin-Palmer Tool & Die realizes that it is of great significance to reduce spindle downtime as much as possible, to successfully enter new markets and win new customers. Martin-Palmer Tool & Die started as a mold shop in 1953. For many years, the Dayton Company in Ohio accumulated and obtained specialized design and manufacturing technologies for specialized material processing equipment in the automotive industry. However, four years ago, the pace of development of this part of the business began to slow down. In order to adapt to the new situation, the company began to pursue short-term work. It believes that for manufacturers in the United States, the cost of seeking outbound foreign production is too high. It then began to shift its target from the automotive industry to OEM OEMs in military and consumer product manufacturing plants and other markets. The company’s partner, Mr. Rich Blevins, said that the current situation is that no one customer can account for more than 30% of the company’s gross sales. Figure 2 This workshop's dual-table machine tool is often used for the maintenance of the engine block, such as re-processing the size of the freezing hole and aperture In order to reduce the downtime of the machine tool spindle, the company believes that the alternative method is to increase the pallet exchange system on the basis of its existing VMC vertical machining center. To this end, the company decided to adopt an atypical gantry-type machine tool platform, which was supplied by Milltronics, in the form of two independently positioned worktables. In September 2006, the company purchased its first Milltronics TT24 dual table machine, and about a year later it purchased its second machine. As Mr Blevins emphasized, the company chose such a device platform for several reasons (the number of parts processed is between 1 and 350): The design of this machine tool can meet the company's need for the highest efficiency machining of the machine tool spindle. The operator can install and commission a workpiece on a workbench outside the working area of ​​the machine, while the machine can machine another part on the workbench in another sealed work area. The only stoppage time for the machine tool spindle occurs when the machined part is removed and the new part is replaced. During machining operations, the doors on either side of the machine work area are closed to prevent splashing of coolant and chips inside, protecting the operator's safety and allowing the operator to safely install on the second workbench. Debug new artifacts. When the new part is commissioned and installed, as long as the operator presses the "Ready" button, the machine will automatically exchange this table with another table that has finished machining the part. An integrated workbench on an ordinary machine tool base has the characteristics of good rigidity and small footprint. The gantry machine is equipped with a vertical spindle and two trays. The tray uses a linear encoder that can move independently and has high positioning precision under the spindle. As each workstation is permanently attached to the same base structure and moves on a shared rail, a robust system is formed. This structure allows the machine to machine a variety of materials, from aluminum to mild steel, tool steel and stainless steel. Figure 3 Although the design of this dual table machine tool is new to the operator of the workshop, it is found that the dialogue control system is the same as the dialogue system of the other machine tools in the workshop. For employees who are not familiar with the design of this machine tool, this dialogue control system helps them improve their learning level. The 610mm TT24 square table and its powerful load capacity allow the shop's machine tools to machine large workpieces. The workshop often undertakes the maintenance and processing tasks of the diesel engine block. The style of the diesel engine block is shown in the figure, and its weight is about 300 lb (1 lb = 0.454 kg). This worktable is large enough to fit multiple vise clamps on it so that the workbench can hold multiple parts and complete machining of these parts on the machine at once. The dialogue control system on the machine tool helps people unfamiliar with the dual-table assembly line. The workshop also has other VMC vertical machining centers from Milltronics, using the manufacturer's Centurion dialogue control system. The similarity of the control system provides a lot of convenience for the operator to operate a new type of double table machine and to grasp the internal and external operating characteristics of the machine. Conversational programming on the machine is based on menus and uses question-and-answer methods so that the operator can quickly grasp the information of the workpiece and automatically create a program based on the entered data. During the process of assembling this new machine tool platform, the workshop re-evaluated the processing method of this machine tool by formulating a typical workpiece machining plan for its VMC vertical machining center. The key to optimizing the efficiency of this two-stage processing machine tool is that when a different work piece appears on any work table, it first needs to coordinate the machining cycle time of the work piece. If the workpieces with long processing cycles are mixed with those with relatively short processing cycles, the ideal results cannot be achieved.
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