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3) The linear pallet library FMC, which is equivalent to the above-mentioned circular pallet library, is linear, and the pallet conveyor is often a rail car. The advantage of this unit is that it can be expanded, adding processing equipment when needed, lengthening the transport track and pallet library, and expanding into larger FMC or other flexible manufacturing systems.
2. Robotic transport FMC.
1) FMC directly transported by the rotary robot.
It consists of 1 to 4 turning centers or other CNC machine tools, as well as fixed-mounted rotary robots and workpiece storage tables. Each device is placed around or on both sides of the robot. The handling of the workpiece during the machining process is automatically realized by the robot. The advantage of this type of FMC is that it has a pallet and its automatic exchange system, which is low in cost but only suitable for machining rotary parts.
2) FMC directly transported by gantry robots.
The FMC directly transported by the gantry robot is characterized by the ability to carry larger and heavier parts and other materials, and the handling equipment does not occupy the site.
3. The spindle box type FMC can be changed.
This type of unit is mainly multi-axis machining, suitable for medium and large-volume production of a small variety. The processing equipment is a combined machine tool that can replace the spindle head. The unit has a spindle library and its transportation exchange device. The workpiece enters the unit from the external system through the pallet exchange device, is sent to the circular rotary table for clamping, and then driven by the power head with the corresponding spindle box on both sides.
The replaceable headstocks are mostly multi-axle boxes, and the machining efficiency is higher than that of the ordinary machining center. However, the spindle configurations of the multi-axle boxes are targeted and have no flexibility; The various headstocks are available for replacement, so the unit is flexible enough to allow several parts to be mixed on the FMC.
Fourth, the application of flexible manufacturing units
1. Application and scope of FMC
(1) Used as an independent processing equipment.
Compared with the machining center, the FMC is more automated. In addition to the automated machining functions of the machining center, it also enables workpiece handling and automation on the machine. The advantages are as follows.
1) Improve the efficiency of workpiece handling and clamping on the machine tool, and reduce the labor intensity of operation.
2) The loading and unloading of the workpiece is carried out at the loading and unloading station without being carried out on the machine tool. The loading and unloading and processing of the workpiece are carried out at the same time, and the machine utilization rate and processing efficiency are higher than the machining center.
3) It can realize the second and third shifts of unattended production in the evening and improve the utilization of machine tools.
4) It is convenient to carry out simultaneous mixed flow production of multi-variety parts (within the range of parts defined by the unit).
(2) As a basic component module of other flexible manufacturing systems.
At present, flexible manufacturing systems and flexible automatic lines are increasingly adopting a modular combination, with FMC as their basic module, which has the advantage of creating conditions for segmentation of flexible manufacturing systems. To this end, FMC tends to adapt to the needs of the system in terms of structural configuration and control.
2. Technical preparation before introducing or purchasing FMC
Due to the above advantages of FMC, compared with other flexible manufacturing systems, it is small in scale, low in investment, significant in benefits, and widely used.
The following preparations are required for an enterprise to introduce or purchase an FMC.
1) Select the parts suitable for processing on the FMC according to the production task, and compile the condition table of the FMC parts to be processed. The main contents include the dimensions of the parts, the maximum and minimum processing dimensions and processing requirements, the type, variety and quantity of tools used, the type of tool used, the variety and quantity, other tooling, working hours and annual output.
2) Analyze and compare the structure, performance and price of various commercial FMCs, and select the appropriate FMC model.
3) According to the parts situation table for tool statistics, determine the tool magazine capacity. Generally, it is necessary to complete the machining of a medium-complexity part with less than 30 tools. Considering that there is room for mixing and production, it is advisable to select the tool magazine capacity of about 60 tools. If you consider the mixed flow production of more complex parts, you should choose the capacity of about 100 tools.
4) Determine the number of pallet banks based on the part statistics table. In order to ensure the second and third class unattended production, the pallet library should ensure that the installable parts are sufficient for use. For the two-shift system, generally six work stations are selected.
5) Purchase the accessories necessary to ensure the normal operation of the FMC, mainly including the tool setting device, cooling device and monitoring device.
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Overshot go into the heart of the drill pipe, the slider move up, make the tube socket head can be inserted into the center, when on the slider move up tight, using friction lift drill, remove loose again after the slider, by means of the connection string to slide along the block should tighten, set aside the center pipe, but in front of the salvage must first determine the bit in the bottom of the hole position, can be in a thin plate with bolts tight end of drill pipe, Drop the drill pipe to the bottom of the hole and press it on the drill bit. After waiting for a moment, it is proposed that the relative position of the drill bit at the bottom of the hole and the center of the rotary plate of the drill can be determined by observing the indentation left by the center pipe of the drill bit on the board, and then move the drill or rotary plate so that the center of the rotary plate is directly in front of the center pipe of the injured head, so as to ensure that the fishing device can be inserted into the center pipe accurately.
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