Lathe

Abstract

To provide a down-sized lathe.SOLUTION: An NC lathe 1 comprises: a first main spindle 31 which is rotatable around a first main spindle center line CL1; a second main spindle 61 which grips a cut work-piece W2 transferred from the first main spindle 31, and is rotatable around a second main spindle center line CL2; a second cutter holder 7 to which a plurality of tools T2 for processing the cut work-piece W2 gripped by the second main spindle 61 are attached; a reception member 73 provided on the second cutter holder 7; a Y2-axis motor 701 which moves at least one of the second cutter holder 7 and the second main spindle 61 in a Y2-axis direction; and an X2-axis motor 64 which moves at least one of the second cutter holder 7 and the second main spindle 61 in an X2-axis direction. The second cutter holder 7 has a plurality of tool attachment parts 711 of the tools T2 at intervals in the Y2-axis direction, and at least one of the tool attachment parts 711 is located at a position overlapped with the reception member 73 in the X2-axis direction.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a lathe including a first spindle rotatable about a first spindle center line and a second spindle capable of gripping a workpiece transferred from the first spindle and rotatable about a second spindle center line.

Background Art

[0002] A lathe is known that includes a spindle capable of gripping and rotating a workpiece, a first tool post to which a tool for machining one end portion of the workpiece gripped by the spindle is attached, a gripping device for gripping the workpiece whose machining of one end portion has been completed, and a second tool post to which a tool for machining the other end portion of the workpiece gripped by the gripping device is attached (see, for example, Patent Document 1). A plurality of types of tools are attached to the first tool post for performing various machining operations. Similarly, a plurality of types of tools are also attached to the second tool post. In recent years, there has been a demand for small-lot production of a variety of products, and there is a need for a second tool post to which a larger number of types of tools can be attached.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the second tool rest of the lathe described in Patent Document 1 is configured to arrange tools side by side in a row, when the number of tools attachable to the second tool rest increases, the second tool rest becomes larger, and in order to make the gripping device movable over the entire arrangement direction of the increased tools, the movable range of the gripping device needs to be widened, resulting in the lathe becoming larger in the tool arrangement direction. In addition, on the second tool rest, there may be cases where functional members such as receiving members for receiving the machined workpiece from the gripping device are installed side by side with the tools. In that case, in addition to the second tool rest becoming larger by the installation of the functional members, it becomes necessary to make the workpiece gripped by the gripping device movable up to the functional member, further widening the movable range of the gripping device, so there has been a problem that the lathe becomes even larger.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a downsized lathe.

Means for Solving the Problems

[0006] The lathe of the present invention for solving the above object includes a first spindle rotatable about a first spindle center line, a second spindle rotatable about a second spindle center line while gripping the workpiece delivered from the first spindle, a tool rest to which a plurality of tools for machining the workpiece gripped by the second spindle are attached, a functional member provided on the tool rest, at least one of the tool rest and the second spindle is moved in a first axial direction orthogonal to the second spindle center line direction along the second spindle center line, in a direction that is vertical a first driving means for moving in the first axial direction which is a direction, and a second driving means for moving at least one of the tool rest and the second spindle in a second axial direction orthogonal to the second spindle center line direction and also orthogonal to the first axial direction, The tool rest has a plurality of attachment portions for the tools at intervals in the first axial direction, and at least one of the plurality of attachment portions is arranged at a position overlapping the functional member in the second axial direction. The functional member is a receiving member having a receiving port for receiving a machined workpiece that has been machined by the tool. The receiving port is characterized in that it is arranged at a position overlapping at least one of the plurality of mounting portions in the second axial direction. Further, a lathe according to the present invention for solving the above object includes a first spindle rotatable about a first spindle center line, a second spindle that holds the workpiece transferred from the first spindle and is rotatable about a second spindle center line, a tool post to which a plurality of tools for machining the workpiece held by the second spindle are attached, a functional member provided on the tool post, at least one of the tool post and the second spindle is moved in a first axial direction that is orthogonal to the second spindle center line direction along the second spindle center line in a direction that is vertical by a first driving means, and a second driving means for moving at least one of the tool post and the second spindle in a second axial direction that is orthogonal to the second spindle center line direction and also orthogonal to the first axial direction. The tool post has a plurality of mounting portions for the tools at intervals in the first axial direction, and at least one of the plurality of mounting portions is arranged at a position overlapping the functional member in the second axial direction. The tool post is arranged at a position separated from the first spindle center line in the second axial direction. The functional member is a receiving member having a receiving port for receiving a machined workpiece that has been machined by the tool. The receiving port is characterized in that it is arranged at a position closer to the first spindle center line in the second axial direction than at least one of the plurality of mounting portions. Furthermore, a first spindle rotatable about a first spindle center line, a second spindle that holds the workpiece transferred from the first spindle and is rotatable about a second spindle center line, a tool post to which a plurality of tools for machining the workpiece held by the second spindle are attached, The functional member provided on the tool rest; First driving means for moving at least one of the tool rest and the second spindle in a first axial direction orthogonal to the second spindle center line direction along the second spindle center line; Second driving means for moving at least one of the tool rest and the second spindle in a second axial direction orthogonal to the second spindle center line direction and also orthogonal to the first axial direction; The tool rest has a plurality of tool mounting portions spaced apart in the first axial direction, and at least one of the plurality of mounting portions may be arranged at a position overlapping the functional member in the second axial direction.

[0007] According to this lathe, by moving at least one of the tool rest and the second spindle in the second axial direction and moving at least one of the tool rest and the second spindle in the first axial direction, any tool can be selected from a plurality of tools attached to the tool rest. And since at least one of the mounting portions is arranged at a position overlapping the functional member in the second axial direction, the length of the tool rest in the second axial direction can be shortened. Also, when machining a workpiece using the tool attached to the mounting portion, the relative position in the second axial direction between the tool rest and the second spindle, and the relative position in the second axial direction between the tool rest and the second spindle when using the functional member can be overlapped or approximated, so the movable range in the second axial direction of one or both of the tool rest and the second spindle can be narrowed. As a result, this lathe can be miniaturized.

[0008] Here, at least one of the plurality of the mounting portions may overlap with a part of the functional member in the second axial direction and may be arranged at a position spaced apart from that part in the first axial direction. In addition, the mounting portion may be a part to which a plurality of tool mounting units for gripping the tool are mounted. And at least one of the plurality of tool mounting units may be arranged at a position overlapping with the functional member in the second axial direction. Further, at least one of the plurality of tool mounting units may overlap with a part of the functional member in the second axial direction and may be arranged at a position spaced apart from that part in the first axial direction. Furthermore, the functional member may be a receiving member described later, may be a measuring device for measuring the shape of a machined workpiece after machining is completed, may be a robot arm for receiving the machined workpiece, or may be a breakage detection device for detecting breakage of the tool. Also, the functional member may be used before or after machining of the workpiece and may have a function not directly related to machining of the workpiece.

[0009] In this lathe, the first driving means may be for moving the tool rest.

[0010] In this lathe, the functional member may function on the workpiece at a position facing the second spindle in the second spindle center line direction.

[0011] Since the function - exerting position where the functional member functions is close to the machining position by the tool in the second axial direction, the moving time when the tool rest and the second spindle relatively move between the function - exerting position and the machining position can be shortened. Thereby, shortening of the machining cycle using the tool rest becomes possible.

[0012] Also, in this lathe, the functional member is a receiving member having a receiving port for receiving a machined workpiece after machining by the tool, The receiving port may be arranged at a position overlapping in the second axial direction with at least one of the plurality of mounting portions.

[0013] By doing so, when machining a workpiece using a tool attached to the mounting portion, the relative position in the second axial direction between the tool rest and the second spindle, and when loading the machined workpiece into the receiving port, the relative position in the second axial direction between the tool rest and the second spindle can be made to overlap or approach each other. Therefore, the movable range in the second axial direction of one or both of the tool rest and the second spindle can be narrowed, and this lathe can be miniaturized.

[0014] Also, in this lathe, the tool rest is arranged at a position separated from the first spindle center line in the second axial direction. The functional member is a receiving member having a receiving port for receiving a workpiece that has been machined by the tool. The receiving port may be arranged at a position closer to the first spindle center line in the second axial direction than at least one of the plurality of mounting portions.

[0015] By doing so, when machining a workpiece using a tool attached to the mounting portion, the relative position in the second axial direction between the tool rest and the second spindle, and when loading the machined workpiece into the receiving port, the relative position in the second axial direction between the tool rest and the second spindle can be made to overlap. Therefore, the movable range in the second axial direction of one or both of the tool rest and the second spindle can be narrowed, and this lathe can be miniaturized.

[0016] Furthermore, in this lathe, the receiving member may be configured to have an inclined surface for moving the received workpiece using a height difference.

[0017] According to this aspect, the space formed below the inclined surface can be effectively utilized as the space where the tool or the tool mounting unit is arranged.

[0018] Here, a coolant nozzle for discharging coolant liquid may be arranged in a space formed below the inclined surface.

[0019] Furthermore, in this lathe, at least one of the plurality of the mounting portions may be arranged at a position shifted in the second axial direction with respect to the closest one of the other mounting portions spaced apart in the first axial direction.

[0020] By arranging in this way, since the mounting portions can be arranged close to each other in the first axial direction, the length of the tool rest in the first axial direction can be shortened and the tool rest can be miniaturized. Also, since the movement range of one or both of the tool rest or the second main spindle in the first axial direction during machining can be made narrow, it contributes to shortening the machining time.

Advantages of the Invention

[0021] According to the present invention, a miniaturized lathe can be provided.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, an example in which the present invention is applied to a NC (Numerical Control) lathe will be used for explanation.

[0024] FIG. 1 is a front view showing the appearance of the NC lathe according to this embodiment.

[0025] As shown in FIG. 1, the NC lathe 1 includes a cutting chamber 11, a first headstock chamber 12, and an operation panel 15 on a base leg 10 (see FIG. 3). This NC lathe 1 corresponds to an example of a lathe. In addition, FIG. 1 also shows the downstream end of a discharge conveyor 9 that conveys the machined workpiece completed by the NC lathe 1 to the outside of the NC lathe 1. The cutting chamber 11 is arranged on the right side of the NC lathe 1 when viewed from the front side. A window 111 for visually recognizing the inside of the cutting chamber 11 is provided in the cutting chamber 11. The first headstock chamber 12 is arranged on the left side of the NC lathe 1 when viewed from the front side. The operation panel 15 is arranged above the first headstock chamber 12. This operation panel 15 is an input device for operating the NC lathe 1. The operator of the NC lathe 1 stands on the front side of the paper surface in FIG. 1 and operates the NC lathe 1 using the operation panel 15, and performs the work of checking the machining operation and the like by looking into the cutting chamber 11 through the window 111.

[0026] FIG. 2 is a plan view simply showing the internal configuration of the NC lathe shown in FIG. 1.

[0027] As shown in Fig. 2, inside the NC lathe 1, there are provided an NC device 2, a first spindle headstock 3, a guide bushing 4, a first tool post 5, a second spindle headstock 6, and a second tool post 7. The NC program is stored in the NC device 2. The NC device 2 is a computer that moves the first spindle headstock 3, the first tool post 5, the second spindle headstock 6, and the second tool post 7 by numerical control according to the NC program. In addition, the NC device 2 also controls the rotation of the first spindle 31 and the second spindle 61. Additionally, a rotating tool in which the tool T1 itself rotates may be attached to the first tool post 5. Similarly, a rotating tool in which the tool T2 itself rotates may also be attached to the second tool post 7. The NC device 2 also controls the rotation of these rotating tools. In addition to the operation using the NC program, the NC lathe 1 can also be operated by directly inputting commands from the operation panel 15 shown in Fig. 1 to the NC device 2.

[0028] The first spindle headstock 3 is disposed within the first spindle headstock chamber 12 shown in Fig. 1. The first spindle 31 is mounted on the first spindle headstock 3. When the Z1-axis motor 32 rotates upon receiving a command from the NC device 2, the first spindle headstock 3 moves in the Z1-axis direction together with the first spindle 31. The Z1-axis direction is the horizontal direction and is the left-right direction in Fig. 2. The first spindle 31 has a first gripping portion such as a collet. In addition, the first spindle 31 releasably grips the long bar-shaped workpiece material W1 inserted therein by the first gripping portion. The first spindle 31 can rotate about the first spindle center line CL1 while gripping the workpiece material W1. The direction of the first spindle center line CL1 coincides with the Z1-axis direction. The first spindle 31 is provided with a first spindle motor 311 such as a built-in motor. When the first spindle motor 311 rotates upon receiving a command from the NC device 2, the first spindle 31 rotates about the first spindle center line CL1. As a result, the workpiece material W1 gripped by the first spindle 31 rotates about the first spindle center line CL1.

[0029] The guide bush 4 is fixed to the leg 10 (see Fig. 3) of the NC lathe 1 by the guide bush support base 41. The end face of the guide bush 4 on the side opposite to the side where the first spindle 31 is arranged is exposed in the cutting chamber 11 shown in Fig. 1. The guide bush 4 slidably supports the end portion of the workpiece material W1 penetrating through the inside of the first spindle 31 in the Z1-axis direction. The portion of the guide bush 4 that supports the workpiece material W1 is rotatable about the first spindle center line CL1 in synchronization with the first spindle 31. That is, the first spindle center line CL1 is also the rotation center line of the portion of the workpiece material W1 supported by the guide bush 4. Since the guide bush 4 suppresses the deflection of the workpiece material W1 during machining, particularly long and slender workpiece materials W1 can be machined with high precision.

[0030] The first tool rest 5 is movable in the X1-axis direction that is orthogonal to the Z1-axis direction and faces the horizontal direction, and in the Y1-axis direction that faces the vertical direction. The first tool rest 5 moves in the X1-axis direction when the X1-axis motor 51 rotates in response to a command from the NC device 2, and moves in the Y1-axis direction when the Y1-axis motor 52 rotates in response to a command from the NC device 2. In Fig. 2, the vertical direction is the X1-axis direction, and the direction orthogonal to the plane of the paper is the Y1-axis direction. A tool T1 for machining the workpiece material W1 is mounted on the first tool rest 5. Fig. 2 shows the state in which the tool T1 is mounted on the first tool rest 5. This tool T1 is arranged in the cutting chamber 11. A plurality of types of tools T1 including a tool bit for outer diameter machining, a tool bit for parting, etc. are arranged side by side in the Y1-axis direction on the first tool rest 5. By moving the first tool rest 5 in the Y1-axis direction, any one of these plurality of types of tools T1 is selected. Then, by moving the first tool rest 5 in the X1-axis direction, the selected tool T1 cuts into the workpiece material W1 gripped by the first spindle 31 to machine the workpiece material W1.

[0031] The second spindle head 6 is disposed within the cutting chamber 11. A second spindle 61 is mounted on the second spindle head 6. When the X2-axis motor 64 rotates upon receiving a command from the NC device 2, the second spindle head 6 moves in the X2-axis direction together with the second spindle 61. Further, when the Z2-axis motor 65 rotates upon receiving a command from the NC device 2, the second spindle head 6 moves in the Z2-axis direction together with the second spindle 61. The X2-axis direction is the same direction as the above-described X1-axis direction, and the Z2-axis direction is the same direction as the above-described Z1-axis direction. The second spindle 61 has a second gripping portion such as a collet. The second spindle 61 receives a cut workpiece W2 that has been processed using the first spindle 31 and cut by a tool for cutoff machining. This cut workpiece W2 corresponds to an example of a workpiece. The second spindle 61 releasably grips the cut workpiece W2 received from the first spindle 31 by the second gripping portion. The second spindle 61 is rotatable about the second spindle center line CL2 while gripping the cut workpiece W2. The direction of the second spindle center line CL2 coincides with the Z2-axis direction. This Z2-axis direction corresponds to an example of the second spindle center line direction. A second spindle motor 611 such as a built-in motor is provided on the second spindle 61. When the second spindle motor 611 rotates upon receiving a command from the NC device 2, the second spindle 61 rotates about the second spindle center line CL2. As a result, the cut workpiece W2 gripped by the second spindle 61 rotates about the second spindle center line CL2. The configurations of the second spindle head 6 and the second spindle 61 will be described in detail later.

[0032] The second tool rest 7 is located within the cutting chamber 11 shown in FIG. 1, at a position separated in the X2-axis direction from the first spindle center line CL1. When the Y2-axis motor 701 rotates upon receiving a command from the NC device 2, the second tool rest 7 moves in the Y2-axis direction. This Y2-axis direction is the same as the above-described Y1-axis direction. A plurality of tools T2 for machining the cut workpiece W2 gripped by the second spindle 61 are attached to the second tool rest 7. FIG. 2 shows a state in which the tool T2 is mounted on the second tool rest 7. Further, the second tool rest 7 is also equipped with a receiving member 73 (see FIG. 5) for receiving the workpiece that has been processed by the tool T2. A plurality of types of tools T2, such as drills and end mills, are attached to the second tool rest 7. Although not shown in FIG. 2, the tools T2 are arranged side by side not only in the X2-axis direction but also in the Y2-axis direction. By the movement of the second spindle base 6 in the X2-axis direction and the movement of the second tool rest 7 in the Y2-axis direction, any one of these plurality of types of tools T2 is selected. Then, when the second spindle base 6 moves in the Z2-axis direction, the cut end side portion of the cut workpiece W2 gripped by the second spindle 61 is machined. The configuration of the second tool rest 7 will be described in detail later.

[0033] FIG. 3(a) is a perspective view showing the second spindle base and the second spindle shown in FIG. 2 together with the second spindle base base. Further, FIG. 3(b) is a perspective view showing a state in which the X2 apron cover and the Z2 apron cover have been removed from FIG. 3(a). These FIGS. 3(a) and 3(b) also show a part of the leg 10.

[0034] As shown in FIG. 3(a), the second spindle head 6 is disposed on a second spindle head base 60 formed on the leg 10. The second spindle head 6 has an X2-axis table 62 movable in the X2-axis direction and a Z2-axis table 63 mounted on the X2-axis table 62 and movable in the Z2-axis direction. The X2-axis table 62 moves in the X2-axis direction together with the second spindle 61 and the Z2-axis table 63 by driving an X2-axis motor 64 (see FIG. 2). This X2-axis direction corresponds to an example of the second axis direction, and the X2-axis motor 64 corresponds to an example of the second driving means. An X2 apron cover 621 is attached to the X2-axis table 62. The X2 apron cover 621 is formed by connecting a number of strip-shaped aluminum plates having a long side in the Z2-axis direction with joints into a sheet shape, and can be flexibly bent in a direction orthogonal to the Z2-axis direction. As shown in FIG. 3(b), the second spindle head base 60 is provided with two linear guides 601 for guiding the movement of the X2-axis table 62 in the X2-axis direction and two X2 cover guides 602 on which the X2 apron cover 621 is placed. The X2 apron cover 621 is slidably placed on the two X2 cover guides 602. The X2 apron cover 621 covers the upper part of the linear guide 601 to prevent foreign matters such as chips generated by cutting from entering around the linear guide 601. When the X2-axis table 62 moves to the lower right side in FIGS. 3(a) and 3(b), the length of the X2 apron cover 621 hanging down from the X2 cover guide 602 increases. When the X2-axis table 62 moves to the upper left side in FIGS. 3(a) and 3(b), the length of the X2 apron cover 621 hanging down from the X2 cover guide 602 decreases.

[0035] The Z2-axis table 63 moves in the X2-axis direction together with the second spindle 61 by driving a Z2-axis motor (not shown). As shown in Fig. 3(a), a Z2 apron cover 631 is attached to the Z2-axis table 63. The Z2 apron cover 631 is formed by connecting a number of strip-shaped aluminum plates having a long side in the X2-axis direction with joints into a sheet shape, and can be flexibly bent in a direction orthogonal to the X2-axis direction. As shown in Fig. 3(b), the X2-axis table 62 is provided with a dovetail groove guide 622 for guiding the movement of the Z2-axis table 63 in the Z2-axis direction and two Z2 cover guides 623 on which the Z2 apron cover 631 is placed. The Z2 apron cover 631 is slidably placed on the two Z2 cover guides 623. The Z2 apron cover 631 covers the upper part of the dovetail groove guide 622 to prevent foreign matters such as chips generated by cutting from entering the periphery of the dovetail groove guide 622. When the Z2-axis table 63 moves to the lower left side in Figs. 3(a) and 3(b), the hanging length of the Z2 apron cover 631 from the Z2 cover guide 623 increases. When the Z2-axis table 63 moves to the upper right side in Figs. 3(a) and 3(b), the hanging length of the Z2 apron cover 631 from the Z2 cover guide 623 decreases.

[0036] When the second spindle 61 grips the machined workpiece W2 (see FIG. 2) and performs machining, the Z2-axis table 63 may repeatedly reciprocate in the Z2-axis direction. Depending on the repetition period and the moving speed in the Z2-axis direction, the Z2 apron cover 631 may become erratic and jump up. Further, when the second spindle 61 grips the machined workpiece W2 and performs machining, the machining is carried out at a position relatively close to the Z2 apron cover 631. Therefore, when the Z2 apron cover 631 jumps up, chips and the like easily enter the inside of the Z2 apron cover 631 provided with the chip groove guide 622. As a countermeasure against this jumping up, in the second spindle base 6 of the present embodiment, a jumping-up prevention member 624 is disposed facing the portion where the Z2 apron cover 631 starts to sag. This jumping-up prevention member 624 is a plate-like member having a surface direction in a direction orthogonal to the Z-axis direction, fixed to the protruding end of a protruding piece protruding from the X2-axis table 62 toward the guide bush 4 (see FIG. 2). When the Z2 apron cover 631 tries to jump up, the portion that tries to jump up collides with this jumping-up prevention member 624, so that the jumping up of the Z2 apron cover 631 can be prevented. By providing this jumping-up prevention member 624 on the second spindle base 6, the length of the protruding piece can be shortened as compared with the case where the jumping-up prevention member 624 is provided on another member such as the second tool rest 7 and protruded toward the Z2 apron cover 631. As a result, the rigidity of the protruding piece is increased and the cost is reduced. Moreover, compared with the case where it is provided on another member and protruded toward the Z2 apron cover 631, there is also an effect that it is less likely to interfere with the operation of a moving body such as the first tool rest 5. Further, since the jumping-up prevention member 624 is provided on the X2-axis table 62, the relative position between the Z2 apron cover 631 and the jumping-up prevention member 624 does not change even when the second spindle base 6 moves in the X2-axis direction. As a result, there is also an effect that the jumping up of the Z2 apron cover 631 can be stably prevented regardless of the position of the second spindle base 6 in the X2-axis direction.

[0037] FIG. 4 is a front view of the second spindle base and the second tool rest shown in FIG. 2 as viewed from the front side of the NC lathe.

[0038] By moving the second spindle headstock 6 in the X2-axis direction by the X2-axis table 62, the second spindle 61 moves to a position facing the first spindle 31 shown in FIG. 2 and a position facing the second tool rest 7. FIG. 4 shows a state in which the second spindle 61 is in a position facing the second tool rest 7 when the second spindle headstock 6 moves from the position facing the first spindle 31 toward the front side of the paper surface. The second tool rest 7 is disposed on a second tool rest base 70 fixed to the leg 10. This second tool rest 7 corresponds to an example of a tool rest. A Y2-axis motor 701 (see FIG. 2) is attached to the second tool rest base 70. This Y2-axis motor 701 corresponds to an example of a first driving means. The second tool rest 7 includes a Y2-axis tool table 71 movable in the Y2-axis direction, a rotary tool motor 72 attached to the Y2-axis tool table 71, a receiving member 73 (see FIG. 5) also attached to the Y2-axis tool table 71, and a coolant nozzle 74 (see FIG. 7). However, the receiving member 73 and the coolant nozzle 74 are not shown in FIG. 4. A tool attachment unit TU and a tool T2 gripped by the tool attachment unit TU are attached to the second tool rest 7. FIG. 4 shows a state in which the tool attachment unit TU and the tool T2 are attached to the second tool rest 7. The Y2-axis tool table 71 moves in the Y2-axis direction together with the rotary tool motor 72, the tool attachment unit TU, and the tool T2 by driving the Y2-axis motor 701. This Y2-axis direction corresponds to an example of a first axis direction. FIG. 4 shows the upper end portions of the Y2-axis tool table 71, the rotary tool motor 72, the tool attachment unit TU, and the tool T2 that have moved upward, indicated by a two-dot chain line. A plurality of tools T2 are arranged on the second tool rest 7 at intervals in the X2-axis direction and the Y2-axis direction. By the movement of the second spindle headstock 6 in the X2-axis direction and the movement of the second tool rest 7 in the Y2-axis direction, an arbitrary one of these tools T2 is selected. Then, mainly by the movement of the second spindle 61 in the Z2-axis direction, the cut end side portion of the cut workpiece W2 gripped by the second spindle 61 is processed. Note that depending on the type of processing, not only the movement of the second spindle 61 in the Z2-axis direction but also the movement of the second spindle 61 in the X2-axis direction or the movement of the second tool rest 7 in the Y2-axis direction may be used to perform the processing.

[0039] FIG. 5 is a side view of the second tool rest as viewed from the right side in FIG. 4. This FIG. 5 shows the state before the tool mounting unit TU and the tool T2 shown in FIG. 4 are mounted on the second tool rest 7. Also, in this FIG. 5, the coolant nozzle 74 (see FIG. 7) is not shown.

[0040] As shown in FIG. 5, on the facing surface side of the Y2-axis tool table 71 facing the second spindle 61 (see FIG. 2), a receiving member 73 is attached. Also, on the facing surface of the Y2-axis tool table 71, six tool mounting portions 711 are formed at the back side of the NC lathe 1 (the first spindle center line CL1 side shown in FIG. 2). This tool mounting portion 711 corresponds to an example of a mounting portion. The tool mounting portion 711 is a hole through which the tool T2 (see FIG. 4) can be mounted via the tool mounting unit TU (see FIG. 4). By this tool mounting portion 711, the mounting positions of the tool T2 and the tool mounting unit TU on the second tool rest 7 are determined. That is, the tool mounting portion 711 can also be said to be a positioning portion of the tool T2 and the tool mounting unit TU. When the tool T2 mounted on the second tool rest 7 is a drill or an end mill whose axial direction is in the Z2-axis direction, in the XY plane orthogonal to the Z2 axis, the center position of the tool mounting portion 711 and the center positions of the mounted tool mounting unit TU and tool T2 usually coincide. The tool mounting portions 711 are formed in a total of six, arranged in two rows in the X2-axis direction and spaced apart in the Y2-axis direction in three stages. Hereinafter, among the tool mounting portions 711, those arranged in the upper stage may be referred to as upper-stage mounting portions 711U, those arranged in the middle stage may be referred to as middle-stage mounting portions 711M, and those arranged in the lower stage may be referred to as lower-stage mounting portions 711D. The tool mounting unit TU can be mounted on each of these six tool mounting portions 711. Also, the Y2-axis tool table 71 incorporates a driving force transmission mechanism (not shown) for transmitting the rotation of the rotary tool motor 72. The upper-stage mounting portion 711U and the lower-stage mounting portion 711D can mount a tool mounting unit TU having a rotation mechanism that rotates by meshing with the driving force transmission mechanism. By mounting the tool mounting unit TU having a rotation mechanism on the upper-stage mounting portion 711U and the lower-stage mounting portion 711D, the tool T2 itself can be rotated and used as a rotary tool.

[0041] The upper mounting portion 711U and the middle mounting portion 711M are arranged side by side in the X2-axis direction and the Y2-axis direction, respectively. In other words, the upper mounting portion 711U and the middle mounting portion 711M are arranged at positions that are the vertices of a rectangle in the XY plane. On the other hand, the lower mounting portion 711D is arranged at a position shifted in the X2-axis direction with respect to the upper mounting portion 711U and the middle mounting portion 711M. In this embodiment, the lower mounting portion 711D arranged on the left side in FIG. 5 is shifted by a distance L1 toward the receiving member 73 side with respect to the middle mounting portion 711M arranged on the left side in FIG. 5. In other words, the lower mounting portion 711D arranged on the left side in FIG. 5 is arranged at a position shifted by a distance L1 in the X2-axis direction with respect to the tool mounting portion 711 (the left middle mounting portion 711M) at the closest position among the other tool mounting portions 711 spaced apart in the Y2-axis direction. Also, the lower mounting portion 711D arranged on the right side in FIG. 5 is shifted by a distance L2 toward the receiving member 73 side with respect to the middle mounting portion 711M arranged on the right side in FIG. 5. By arranging them with such a shift, the middle mounting portion 711M and the lower mounting portion 711D can be arranged close to each other in the Y2-axis direction, so the length of the second tool rest 7 in the Y2-axis direction can be shortened, and the second tool rest 7 can be miniaturized. Also, since the moving distance of the second tool rest 7 in the Y2-axis direction in machining can be shortened, it contributes to shortening the machining time. Furthermore, the lower mounting portion 711D arranged on the left side in FIG. 5 is arranged at a position where it overlaps with the receiving member 73 by a distance L3 in the X2-axis direction. Even further, the lower mounting portion 711D arranged on the left side in FIG. 5 is arranged at a position where it overlaps with the later-described receiving port 731 by a distance L4 in the X2-axis direction.

[0042] The receiving member 73 is disposed at the front side portion of the NC lathe 1 in the second tool post 7. This receiving member 73 corresponds to an example of a functional member. The receiving member 73 has a receiving port 731 for receiving the machined workpiece whose machining has been completed, and an inclined surface 732 for moving the received workpiece using a height difference. After the machining using the second spindle 61 is completed, by the movement in the X2-axis direction of the second spindle base 6 and the Y2-axis direction of the second tool post 7, the second spindle 61 is disposed at a position facing the receiving member 73 in the Z2-axis direction. More specifically, the machined workpiece gripped by the second spindle 61 is disposed at a position facing the receiving port 731 in the Z2-axis direction. Then, by the movement of the second spindle base 6 in the Z2-axis direction, the end portion of the machined workpiece on the side exposed from the second spindle 61 is inserted into the inside of the receiving member 73 from the receiving port 731. Next, the second spindle 61 releases the grip and pushes out the machined workpiece from the second spindle 61. As a result, the machined workpiece is put into the receiving member 73, rolls on the inclined surface 732, and rolls down to the lower left in FIG. 5. The machined workpiece that has rolled down is conveyed outside the NC lathe 1 by a discharge conveyor 9 (see FIG. 6).

[0043] FIG. 6 is a perspective view of the NC lathe seen from the right side and slightly rearward with a part of the NC lathe cut away.

[0044] As shown in Fig. 6, the discharge conveyor 9 extends in the Z-axis direction on the front side of the NC lathe 1. As described above, the machined workpiece that has been put into the receiving member 73 and rolled down on the inclined surface 732 rides on the discharge conveyor 9 and is conveyed to the downstream end of the discharge conveyor 9 shown in Fig. 1. The space between the discharge conveyor 9 and the cutting chamber 11 is partitioned by a partition wall 91. In other words, the discharge conveyor 9 is arranged in a room partitioned from the cutting chamber 11. In the cutting chamber 11, a large amount of coolant liquid is discharged during cutting, and chips generated by cutting may also scatter. If these coolant liquids and chips reach the discharge conveyor 9, they will be conveyed to the outside of the NC lathe 1 together with the machined workpiece. In this embodiment, by providing the partition wall 91, it is possible to prevent the coolant liquid and chips from reaching the discharge conveyor 9. Instead of the discharge conveyor 9, other discharge devices such as an in-machine stocker that moves and stores the machined workpiece by its own weight to the lower part inside the NC device 1 may be provided. Even when such other discharge devices are provided, similar to the discharge conveyor 9, by partitioning the other discharge devices from the cutting chamber 11 by the partition wall 91, it is possible to prevent the coolant liquid and chips from reaching the other discharge devices.

[0045] Fig. 7(a) is a side view similar to Fig. 5 showing the second tool post to which the coolant nozzle and the tool mounting unit are attached, and Fig. 7(b) is a B-B cross-sectional view taken along the line B-B of Fig. 7(a). However, in Fig. 7(b), the tools T2 and the tool mounting units TU attached to the middle mounting part 711M and the lower mounting part 711D and the driving force transmission mechanism built in the Y2-axis tool table 71 are not shown. Also, in Fig. 7(b), the hatching showing the cross-section is not shown.

[0046] As shown in Fig. 7(a), the tool mounting unit TU has a base portion that contacts the end face of the Y2-axis tool table 71 and is generally oval or generally rectangular in shape. Among the tool mounting units TU, those attached to the upper mounting portion 711U (see Fig. 5) have the long side of the base portion facing in the Y2-axis direction. On the other hand, the tool mounting unit TU attached to the middle mounting portion 711M (see Fig. 5) and the tool mounting unit TU attached to the lower mounting portion 711D (see Fig. 5) are attached such that the long side of the base portion faces in the X2-axis direction. By adopting such a configuration that the long side of the base portion faces in the X2-axis direction, the tool T2 can be arranged close to the Y2-axis direction, so that the movement stroke of the second tool rest 7 in the Y2-axis direction in machining can be shortened. In addition, the length of the second tool rest 7 in the Y2-axis direction can be shortened. Note that a cross drill unit holding a tool T2 for performing drilling or the like in the Y2-axis direction may be attached to the upper mounting portion 711U as the tool mounting unit TU. In this cross drill unit, a rotational moment centered on the X2-axis direction is applied to the base portion of the cross drill unit during machining. In order to efficiently receive the rotational moment at the base portion of the tool mounting unit TU, it is preferable that the tool mounting unit TU attached to the upper mounting portion 711U be configured to be attached such that the long side of the base portion faces in the Y2-axis direction. Further, in the vicinity of the upper mounting portion 711U, the width in the X2-axis direction is narrow because the receiving member 73 protrudes toward the upper mounting portion 711U side. Also, in order to attach a plurality of tool mounting units TU to this portion, it is preferable that the upper mounting portion 711U be configured to attach the tool mounting unit TU such that the long side of the base portion faces in the Y2-axis direction.

[0047] In addition, four coolant nozzles 74 for discharging coolant liquid are attached to the second tool rest 7. Three of these coolant nozzles 74 are arranged above the receiving member 73 and the tool mounting unit TU, and the remaining one is arranged below the inclined surface 732 of the receiving member 73. As shown in Fig. 7(b), the receiving member 73 protrudes significantly in the Z2-axis direction from the Y2-axis tool table 71. Also, the lower left tool mounting unit TU in Fig. 7(a) is arranged at a position overlapping the receiving member 73 in the X2-axis direction. For these reasons, even if coolant liquid is discharged from the three coolant nozzles 74 arranged above, it is difficult to supply coolant liquid to the lower left tool T2 in Fig. 7(a) except for the tip portion protruding in the Z2-axis direction from the receiving member 73. In the present embodiment, by arranging the coolant nozzle 74 below the receiving member 73 which is likely to become an empty space, it is possible to sufficiently supply coolant liquid to the tool T2 located at a position overlapping the receiving member 73 in the X2-axis direction without increasing the size of the NC lathe 1.

[0048] When the receiving member 73 is fixed to the legs 10 (see FIG. 4) instead of being attached to the second tool rest 7, it is necessary to arrange the receiving member 73 avoiding the movement range of the second tool rest 7. Therefore, when the receiving member 73 is not attached to the second tool rest 7, it is necessary to configure the second main shaft 61 to be able to move a long distance in the X2-axis direction, which is the arrangement direction of the receiving member 73 and the second tool rest 7. On the other hand, according to the NC lathe 1 of this embodiment, since the receiving member 73 is mounted on the second tool rest 7, there is no need to arrange the receiving member 73 avoiding the movement range of the second tool rest 7. Further, since the tool mounting portion 711 arranged at the lower left in FIG. 5 is arranged at a position overlapping the receiving member 73 in the X2-axis direction, the length of the second tool rest 7 in the X2-axis direction can be shortened. And, when machining the cut workpiece W2 using the tool T2 attached to the tool mounting portion 711 arranged at the lower left in FIG. 5, the position of the second main shaft 61 in the X2-axis direction and the position of the second main shaft 61 when using the receiving member 73 in the X2-axis direction can be overlapped or approximated, so that the movable range of the second main shaft 61 in the X2-axis direction can be narrowed. As a result, the NC lathe 1 can be miniaturized. Also, by miniaturizing, the cost of the NC lathe 1 can be reduced. Further, since the machining position by the tool T2 and the receiving position of the receiving member 73 are approximated in the X2-axis direction and the movement time of the second main shaft 61 moving between them can be shortened, the machining cycle in machining using the second tool rest 7 can be shortened. In addition, by forming the tool mounting portion 711 at the lower left in FIG. 5 so that the tool mounting unit TU is arranged in the space formed below the inclined surface 732 of the receiving member 73, the space can be effectively utilized.

[0049] Subsequently, regarding the modification example of the second tool rest 7 described so far, in the following description, the same components as the component names described so far may be given the same reference numerals as those used so far, and redundant descriptions may be omitted.

[0050] FIG. 8 is a side view similar to FIG. 5 showing a modification example of the second tool rest.

[0051] As shown in FIG. 8, the second tool rest 7 of this modified example is different from the second tool rest 7 shown in FIG. 5 in that three lower mounting portions 711D are provided. Of the three lower mounting portions 711D, the right and middle ones are arranged on the back side of the NC lathe 1 with respect to the receiving member 73 in the X2-axis direction. On the other hand, the lower mounting portion 711D arranged on the left side in FIG. 5 overlaps the receiving member 73 as a whole in the X2-axis direction and is arranged at a position where it enters the receiving member 73 side (front side of the NC lathe 1) by a distance L5. Further, the lower mounting portion 711D arranged on the left side in FIG. 5 is arranged at a position separated from the receiving member 73 by a distance L6 on the front side of the NC lathe 1 in the X2-axis direction. In other words, the receiving port 731 is arranged at a position closer to the first spindle center line CL1 (see FIG. 2) in the X2-axis direction than the lower mounting portion 711D arranged on the left side in FIG. 5.

[0052] Even in this modified example, the same effects as those of the previous embodiment are achieved. In addition, since the number of tools T2 that can be attached to the second tool rest 7 increases, more diverse machining can be performed. Further, since the position of the second spindle 61 in the X2-axis direction when using the receiving member 73 is within the moving range of the second spindle 61 in the X2-axis direction when machining the machined workpiece W2, it is not necessary to widen the movable range of the second spindle 61 in the X2-axis direction in order to use the receiving member 73.

[0053] The present invention is not limited to the above-described embodiments and can be variously modified within the scope described in the claims. For example, in the present embodiment, the example in which the second spindle head 6 moves in the X2-axis direction together with the second spindle 61 has been described. However, instead of the second spindle head 6, the second tool rest 7 may be configured to move in the X2-axis direction. Further, the second spindle head 6 may be configured to move in the X2-axis direction, and the second tool rest 7 may also be configured to move in the X2-axis direction independently of the second spindle head 6. In these cases, the motor for moving the second tool rest 7 in the X2-axis direction corresponds to an example of the second driving means. Similarly, instead of the second tool rest 7, the second spindle head 6 may be configured to move in the Y2-axis direction. Further, the second tool rest 7 may be configured to move in the Y2-axis direction, and the second spindle head 6 may also be configured to move in the Y2-axis direction independently of the second tool rest 7. In these cases, the motor for moving the second spindle head 6 in the Y2-axis direction corresponds to an example of the first driving means. In addition, although the example in which the receiving member 73 is provided on the second tool rest 7 has been described, instead of the receiving member 73, a measuring device for measuring the shape of the machined workpiece may be provided, a robot arm for receiving the machined workpiece may be provided, or a breakage detection device for detecting breakage of the tool T1 or the tool T2 may be provided. In these cases, the measuring device, the robot arm, or the breakage detection device corresponds to an example of the functional member. Note that each of the receiving member 73, the measuring device, the robot arm, and the breakage detection device functions with respect to the workpiece before or after machining of the workpiece. In addition, although the example in which two tool mounting portions 711 are arranged side by side in the X2-axis direction has been shown, they may not be arranged side by side in the X2-axis direction, or three or more may be arranged side by side in the X2-axis direction. Similarly, although the example in which the tool mounting portions 711 are arranged in three stages in the Y2-axis direction has been shown, the number of stages may be any number of two or more. In the present embodiment, the NC lathe 1 in which the X2-axis direction is horizontal and the Y2-axis direction is vertical has been described. However, a lathe having a so-called slant structure in which the X2-axis direction is inclined with respect to the horizontal direction and the Y2-axis direction is inclined with respect to the vertical direction may be used. Note that even in the case of the slant structure, the X2-axis direction, the Y2-axis direction, and the Z2-axis direction are orthogonal to each other. Further, the X1-axis direction may be the vertical direction, and the Y1-axis direction may be the horizontal direction.

[0054] Even constituent elements that are only included in the descriptions of the respective modification examples described above may have their constituent elements applied to other modification examples.

Explanation of Signs

[0055] 1 NC Lathe 7 Second Tool Post (Tool Post) 31 First Spindle 61 Second Spindle 73 Receiving Member (Functional Member) 711 Tool Mounting Port (Mounting Port) CL1 First Spindle Center Line CL2 Second Spindle Center Line T2 Tool W2 Cut Workpiece

Claims

1. a first spindle rotatable about a first spindle center line; a second spindle that holds a workpiece transferred from the first spindle and is rotatable about a second spindle center line; a tool post to which a plurality of tools for machining the workpiece held by the second spindle are attached; a functional member provided on the tool post; a first driving means for moving at least one of the tool post and the second spindle in a first axial direction which is a direction perpendicular to the second spindle center line direction along the second spindle center line and is a vertical direction; a second driving means for moving at least one of the tool post and the second spindle in a second axial direction perpendicular to the second spindle center line direction and also perpendicular to the first axial direction; the tool post has a plurality of tool attachment portions spaced apart in the first axial direction, and at least one of the plurality of attachment portions is arranged at a position overlapping the functional member in the second axial direction; the functional member is a receiving member having a receiving port for receiving a machined workpiece after machining by the tool; the lathe is characterized in that the receiving port is arranged at a position overlapping at least one of the plurality of attachment portions in the second axial direction.

2. a first spindle rotatable about a first spindle center line; a second spindle that holds a workpiece transferred from the first spindle and is rotatable about a second spindle center line; a tool post to which a plurality of tools for machining the workpiece held by the second spindle are attached; a functional member provided on the tool post; a first driving means for moving at least one of the tool post and the second spindle in a first axial direction which is a direction perpendicular to the second spindle center line direction along the second spindle center line and is a vertical direction; a second driving means for moving at least one of the tool post and the second spindle in a second axial direction perpendicular to the second spindle center line direction and also perpendicular to the first axial direction; the tool post has a plurality of tool attachment portions spaced apart in the first axial direction, and at least one of the plurality of attachment portions is arranged at a position overlapping the functional member in the second axial direction; the tool post is arranged at a position separated from the first spindle center line in the second axial direction; the functional member is a receiving member having a receiving port for receiving a machined workpiece after machining by the tool; The lathe is characterized in that the receiving port is arranged at a position closer to the first spindle center line in the second axial direction than at least one of the plurality of mounting portions. **Claim 3** The lathe according to claim 1 or 2, characterized in that the first driving means moves the tool rest. **Claim 4** The lathe according to any one of claims 1 to 3, characterized in that the functional member functions on the workpiece at a position facing the second spindle in the second spindle center line direction. **Claim 5** The lathe according to any one of claims 1 to 4, characterized in that the receiving member has an inclined surface for moving the received workpiece using a height difference. **Claim 6** The lathe according to any one of claims 1 to 5, characterized in that at least one of the plurality of mounting portions is arranged at a position shifted in the second axial direction with respect to the closest one of the other mounting portions spaced apart in the first axial direction.

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