【導(dǎo)讀】M06也會將關(guān)閉冷卻液如果它流動。該設(shè)備提供機床工作臺必須放置在經(jīng)營者朝向這臺機器的左側(cè)和。這也是能夠使操作者拿得到刀具，無需彎腰工作。參考圖，機器設(shè)置點是在機X175和Y110的坐標。軸300-175=325mm和Y軸110mm有最大可能的運動。這樣會布置儀表為的是可以間。隙為25mm和10mm分別在X軸和Y軸方向上進行微動。使換刀裝置將改變機床。控制系統(tǒng)可自動定。算坐標主軸頭移動，以便有足夠的空間操作無干擾的傳輸機制是必不可少的。在設(shè)定的機器期間第一部分將被放置在副軸當機器處于手動控制。程序控制下，新工作的空白將取代完成所有的加工操作結(jié)束時。這樣是工具到操作者的手中。在打開鉗口之前，切屑會被。顯然在安全工作實踐中主要刀具主軸在最后一塊換工作之前將會被編程停。機械表在工作中不斷變化的相對主軸的中心。裝載的刀具在特定的位置并不重要。軸數(shù)據(jù)，因為它是不可能改變的銑刀和鉆頭的直徑。由部分程序員是數(shù)零基準，讀出的控制單元也為零，特殊工具。

　　

【正文】 zine of a machining center is called automatic tool changer (ATC). ATC plays an important role in reducing the machine idle time and therefore increases productivity in machining propose of this paper is to present a design methodology for the systematic generation of all possible configurations of machining centers with automatic tool changer, that are opentype spatial mechanisms subject to topology and motion constraints Existing Mechanisms The first step of the design process is to study existing mechanisms and conclude their topology and motion characteristics, A machining center is a machine tool consisting of four basic ponents: a spindle, a tool magazine, a tool change mechanism, and a machine tool structure including motion of power axes. The machine tool structure largely determines the accuracy of machined surface, stiffness, and dynamic quality. The spindle rotates the tool to machine the workpiece to the desired surface. The tool magazine stores the tools and moves them to suitable positions for use in machining operations. The tool change mechanism executes tool changes between the tool magazine and the spindle. The simplest ATC is a design without a tool change mechanism, and the relative motions between the tool magazine and the spindle achieve tool change motions. Figures 3(a) and (b) show two 3axis horizontal machining centers with drum type and linear type tool magazines, respectively. To represent and analyze the topological structures and motion characteristics of machining centers, a coordinate system is defined to describe the allocation of each motion axis of the machining centers based on International Organization for Standardization (ISO, 1974) nomenclature. This standard coordinate system is righthanded rectangular Cartesian one, related to a workpiece mounted in a machine and aligned with the principal linear sideways of that machine. The positive direction of movement of a ponent of a machine is that which causes an increasing positive dimension of the workpiece. The schematic drawings of horizontal machining centers appended to ISO standard are shown in Fig. 3. By analyzing available existing 3axis horizontal machining centers without tool change mechanism, we conclude their topology and motion characteristics (Yan and Chen, 1995) as follows. Topology Requirements Topology requirements are concluded according to the topology characteristics of existing mechanisms. For our example, the design requirements of links and joints of the 3axis horizontal machining centers in their corresponding tree graphs are: 1. There must be a pendant vertex as the spindle. 2. There must be a vertex, where the length of path to the spindleis four, as the working table. 3. There must be a root, which is located on the path from the spindle head to the working table, as the frame. 4. There must be a vertex, which is a pendant vertex branching from the branch vertex located on the path from the frame tothe spindle head, as the tool magazine. 5. The edge incident with the spindle must be assigned as arevolute pair. 6. The edges between the spindle head and the working tablemust be assigned as prismatic pairs. 7. The edges between the tool magazine and the branch vertexmust be assigned as revolute, prismatic, or cylindrical , if there is a revolute pair or a cylindrical pair, it must beincident with the tool magazine. Based on the topological requirements of existing mechanisms,the assignment rules of links and joints are concluded as follows. Link assignment rules 1. Select a pendant vertex as the spindle. 2. Select a vertex, where the length of path to the spindle is four, as the working table. If this vertex does not exist, delete this graph and go to step 6. 3. Select a vertex, which is located on the path from the spindle head to the working table, as the frame. 4. Select a vertex, which is the pendant vertex branching from the branch vertex located on the path from the spindle head to the frame, as the tool magazine. If this vertex does not exist, delete this graph and go to step 6. 5. The other unassigned vertices are assigned as links L. 6. Complete the link assignment. Joint assignment rules 1. The edge incident with the spindle is assigned as a revolute pair. 2. The edges on the path from the spindle head to the working table are assigned as prismatic pairs. 3. Based on the length of path from the branch vertex to tool magazine, the edges can be assigned according to the joint permutations of R, P, and C. After specialization, we must identify these specialized tree graphs subject to topology constraints of the mechanisms of machining centers we would like to create. For our example, the topology constraints are listed as follows: 1. The pendant vertices must be the spindle, the tool magazine, or the working table. 2. The vertex of tool magazine is located on the branch from the spindle head to the frame. 3. The revolute pair must be incident with the spindle or the tool magazine, and the cylindrical pair must be incident with the tool magazine. According to the link and joint assignment rules, we can specialize the atlas of tree graphs to obtain the specialized tree graphs. The process of specialization can be puterized by inputting adjacent matrices of the tree graphs into the program and resulting with desired link adjacent matrices and the numbers of topological structures. Figure 7 shows the puter flowchart of specialization, and the numbers of topological structures that satisfy the topological requirements and constraints are listed in Table 3.