JP2012152833A - Machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine tool preventing a cutting liquid from leaking out of a base even when the cutting liquid leaks from the joint of a member included in a base cover.SOLUTION: The extension part 71a of eaves 71 is formed longer, and a connection part 72c between the extension part 71a of the eaves 71 and the end 72a of a flow path bottom plate 74 is formed above the front wall 2b of the base and inside the base 2. Thus, even when coolants leak near the center of the connection part 72c between the extension part 71a of the eaves 71 and the end 72a of the flow path bottom plate 74, the coolants drop inside the base from the front wall 2b of the base, and accordingly leakage of the coolants out of the base is prevented. A base cover 70 is used to reduce the size and weight of the base.

Description

  The present invention relates to a machine tool, and more particularly to a machine tool provided with a base cover on a bed.

  2. Description of the Related Art Conventionally, a machining center that is an example of a machine tool includes a machine tool main body that processes a workpiece and a splash cover that covers the machine tool main body. The machine tool body includes a bed serving as a base, a column provided at the rear of the bed, a spindle that is provided on the column and rotates at a high speed with a processing tool mounted thereon, and the spindle and the bed. It is mainly composed of a table disposed between and a table on which a work is placed. In addition, the bed is cast and formed in a box shape, and a support part for fixing the table is fixed to the upper surface on the front side of the column, and cutting scraps and cuttings are placed in the center of the bed (between the column and the support member). A drop hole for dropping the liquid to a specific location is formed. In this case, in order to allow chips to flow through the drop hole, a base cover that functions as a ridge is provided on the surface around the support portion, and the flow path portion of the base cover is inclined toward the drop hole. (For example, refer to Patent Document 1).

JP 2007-61998 A

  However, the above-mentioned machine tool has a problem in that it cannot be reduced in weight because the base is large. Therefore, it is conceivable to reduce the size of the base so that the front end side of the base cover protrudes like an eave from the front end side of the base so as to receive the lower end portion on the front side of the splash cover. However, in this case, since the base cover connects the plate material constituting the eave and the plate material constituting the flow path, there is a problem that cutting fluid may leak from the joint.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a machine tool that can prevent the cutting fluid from flowing out of the base even if the cutting fluid leaks from the joint of the members constituting the base cover. .

  The machine tool according to the first aspect of the present invention provides a support for supporting a table portion on which the workpiece is placed on a base that is a base of the machine tool that processes the workpiece by relatively moving the workpiece and a tool. And a base cover that is provided along the support and that discharges workpiece chips and cutting fluid to the outside of the base. The base cover is shaped like an eave from the front end of the base. An eave portion that receives the chips and the cutting fluid, and a pair of flow passage portions that are connected to the eave portion and form a flow path for flowing the chips and the cutting fluid along the support portion, and A connecting portion between the eave portion and the flow path portion is formed on the upper side inside the front wall of the base. Even if the cutting fluid leaks from the connecting portion between the eaves portion and the flow passage portion, the cutting fluid falls inward from the front wall of the base, so that it can be prevented from flowing out of the base even if the cutting fluid leaks.

  The machine tool according to the first aspect includes plate members each extending from an end portion on the flow channel side of the eave portion so as to overlap each of the bottom plates of the pair of flow channel portions, and the plate member and the You may form the connection part with the bottom plate of a flow-path part above the inner side rather than the front wall of the said base. Even if the cutting fluid leaks from the connecting portion between the plate member and the bottom plate of the flow path portion, the cutting fluid falls inward from the front wall of the base, so that it can be prevented from flowing out of the base even if the cutting fluid leaks. .

  In the machine tool according to the first aspect, the lower surface of the eaves portion is inclined and extended from the lower surface toward the inner side of the front wall so that the leaked cutting fluid flows inside the front wall of the base. An inclined plate is provided. The cutting fluid that has fallen on the inclined plate is guided by the inclined plate and falls inward from the front wall of the base, so that even if the cutting fluid leaks, it can be prevented from flowing out of the base.

1 is a perspective view of a machining center 1. FIG. 2 is a right side view of the machining center 1. FIG. FIG. 3 is a cross-sectional view in the direction of arrows X-X in FIG. 2. 3 is a perspective view of a base 2. FIG. 2 is a plan view of a base 2. FIG. 3 is a perspective view of a state in which a base cover 70 is attached to the base 2. FIG. 4 is a plan view of a state in which a base cover 70 is attached to the base 2. FIG. FIG. 6 is a perspective view of the base cover 70 as viewed from the upper right rear side. FIG. 5 is a perspective view of the base cover 70 as viewed from the rear left and diagonally below. 3 is a plan view of a base cover 70. FIG. 3 is a left side view of a base cover 70. FIG. FIG. 6 is a partially enlarged view of the base cover 70 in the vicinity of a joint. It is XI-XI arrow direction sectional drawing shown in FIG. FIG. 13 is a cross-sectional view taken along the line XII-XII shown in FIG. 12.

  Hereinafter, a machining center 1 which is an embodiment of a machine tool of the present invention will be described with reference to the drawings. In FIG. 4, the diagonally lower left side is the front of the base 2, and the diagonally upper right side is the rear of the base 2. Further, in FIG. 10, the lower side is the front of the base cover 70 and the upper side is the rear of the base cover 70. In the following description, the X-axis direction of the machining center 1 refers to the left-right direction of the machining center 1 shown in FIG. 3, the Y-axis direction refers to the front-rear direction (depth direction) of the machining center 1 shown in FIG. The Z-axis direction refers to the vertical direction of the machining center 1 shown in FIG.

  First, a schematic configuration of the machining center 1 will be described. The machining center 1 shown in FIG. 1 performs desired machining (for example, “boring”, “milling”, “drilling”, “cutting”, etc.) on a workpiece by moving a workpiece and a tool (not shown) relative to each other. ). The machining center 1 includes an iron base 2 serving as a base, a machine main body 60 (see FIG. 3) for processing a workpiece, and a machine main body fixed on the base 2. The box-shaped splash cover 3 that covers the upper portion of the base 2 and the base cover 70 that is fixed to the upper portion of the base 2 and receives the lower portion of the splash cover 3 are mainly configured. A control box 9 containing a control device (not shown) for controlling the operation of the machining center 1 is disposed behind the splash cover 3.

  Next, as shown in FIGS. 1 to 3, the splash cover 3 includes a front wall 3a, a right side wall 3b, a left side wall 3c, a top wall 3d, a right bottom wall 3e projecting diagonally to the right from the top of the base 2, The box is made of a plurality of sheet metals, such as a left bottom wall 3f projecting diagonally to the left from the top of the base 2, a right back wall 3g projecting right from the front of the column 5, and a left back wall 3h projecting left from the front of the column 5. Configured. As shown in FIG. 1, a vertically long rectangular opening 10 is provided in the approximate center of the front wall 3 a, and a sliding open / close door 11 is provided in the opening 10. And the opening part 10 is opened by sliding the handle part 11a of this opening-and-closing door 11 to the left direction, and the workpiece | work hold | maintained on the table 8 (refer FIG. 3) mentioned later is attached or detached. An operation panel 12 is provided on the right side of the open / close door 11 for inputting a machining program, parameters, and the like for the machining center 1.

  Further, as shown in FIGS. 1 and 2, the right side wall 3 b is provided with a rectangular opening 14, and a lid-like inspection hatch 15 is detachably fixed to the opening 14. Then, the inspection hatch 15 is removed and the opening 14 is opened so that the work on and off the work on the table 8 and the maintenance work of various devices constituting the machine main body housed inside the splash cover 3 can be performed. It has become. Although not shown, the left side wall 3c is also provided with an opening similar to the right side wall 3b and an inspection hatch that closes the opening.

  As shown in FIGS. 1 and 2, the top wall 3d of the splash cover 3 has a spindle head (not shown), a cable bear (not shown) for wiring the spindle head, and a tool changer 6 (see FIG. 1). 3) is provided with an opening (not shown) from which a magazine motor (not shown) or the like protrudes, and box-shaped covers 17 and 18 are respectively covered in the opening. Further, a tower-type warning notification lamp 16 for notifying an operator of an error related to the operation of the machining center 1 is installed at the upper left corner of the front wall 3a of the splash cover 3.

  And inside the splash cover 3, as shown in FIG. 3, a machine main body 60 for cutting a workpiece is housed. The machine main body 60 has a columnar column 5 mounted and fixed on a column seat 4 (see FIG. 2) provided on the upper rear side of the base 2, and the column 5 facing the upper portion of the base 2. A spindle head (not shown) which is provided on the front surface side and is held so as to be movable in the Z-axis direction; a spindle 7 which is rotatably held at the lower part of the spindle head; and a tool attached to the spindle 7 It is mainly composed of a tool changer (ATC) 6 that automatically changes. Furthermore, a table 8 is disposed in the storage section 20 above the base 2 so that the workpiece is detachably fixed and movable in the XY axis directions.

  Next, the table 8 will be described with reference to FIGS. The table 8 is disposed on a table support 24 (see FIG. 4) described later of the base 2 and is provided so as to be movable in the XY axis direction (horizontal plane). More specifically, a moving body 50 is provided below the table 8, and a pair of X-axis feed guides (not shown) extending along the X-axis direction are provided above the moving body 50. It has been. Then, the table 8 moves on the pair of X-axis feed guides by an X-axis moving mechanism including a ball screw shaft, a nut, an X motor (not shown), and the like. Further, the moving body 50 is provided so as to be movable on a pair of Y-axis feed guides 30, 30 extending along the Y-axis direction. Then, the movable body 50 moves on the pair of Y-axis feed guides 30 and 30 by a Y-axis movement mechanism composed of a ball screw shaft, a nut, a Y motor (not shown) and the like similar to the X-axis movement mechanism. . Therefore, the table 8 can move in the XY axis direction.

  Further, as shown in FIG. 3, a pair of telescopic covers 52 and 53 that telescopically expand and contract are covered on the X-axis feed guide on the left and right sides with the table 8 in the center. Further, the Y-axis feed guides 30 and 30 are also formed of a telescopic cover 54 disposed on the front side of the table 8 and a sheet metal formed in a substantially mountain-like cross section disposed between the table 8 and the front side of the column 5. And a Y-axis rear cover (not shown). Therefore, the X-axis feed guide and the Y-axis feed guides 30 and 30 are covered with these various covers, regardless of the direction in which the table 8 moves (limited to the XY-axis direction constituting the horizontal plane). Therefore, it is possible to prevent chips from accumulating on the X-axis feed guide and the Y-axis feed guides 30 and 30.

  Next, the base 2 will be described with reference to FIGS. The base 2 is molded by pouring a metal material such as cast iron into a mold, is formed in a substantially rectangular parallelepiped shape that is long in the Y-axis direction, and a front wall 2b is formed at the front portion. Further, the core portion is so-called cut-out molding (frame structure with ribs) in order to reduce the weight, increase the strength, and reduce the cost. And the leg part 2a is provided in the four corners of the lower part of the base 2, respectively. A pair of column seats 4 and 4 (see FIG. 4), which are pedestals formed in a substantially rectangular parallelepiped shape, are provided at both corners on the upper rear side of the base 2 so as to be spaced apart from each other. On the seats 4 and 4, a lower portion of a columnar column 5 extending in the Z-axis direction is placed and fixed.

  Next, the upper structure of the base 2 will be described in detail. As shown in FIG. 4, concave storage portions 20, 20 whose upper surfaces are open are integrally formed on the upper side of the base 2. The storage portion 20 includes a bottom portion 21 that is substantially rectangular in plan view and extends in the Y-axis direction, and a peripheral plate 22 that stands up to surround the periphery of the bottom portion 21. The bottom portion 21 is gently inclined downward from the front to the rear of the base 2. Therefore, the coolant that has fallen into the flow path portion 72 of the base cover 70 that scatters inside the splash cover 3 and fits into the storage portion 20 flows along the inclined surface of the bottom portion 21, and from the rear of the base 2 to the base 2. It is designed to be discharged outside.

  As shown in FIGS. 4 and 5, a substantially rectangular parallelepiped table support base 24 for supporting the table 8 substantially horizontally is provided at a substantially central portion of the upper surface of the base 2. The table support base 24 is composed of a substantially rectangular parallelepiped support base body 25 and a pair of right support wall 26 and left support wall 28 provided so as to stand substantially vertically from both left and right ends of the support base body 25. The cross section which is comprised and orthogonal to a longitudinal direction is formed in the substantially concave shape. The table support 24 corresponds to “a support portion that supports the table portion”.

  Next, the structure provided on the table support 24 will be described. First, the structure provided in the support base body 25 will be described. First, as shown in FIG. 4, on the rear side of the upper surface of the support base body 25, one end of a ball screw shaft (not shown) of the Y-axis moving mechanism is rotatably supported and a Y motor that rotates the ball screw shaft. A pair of support blocks 47, 47 for fixing (not shown) is provided. On the other hand, a pair of support blocks 48 and 48 for rotatably supporting the other end opposite to the one end of the ball screw shaft are provided on the front upper surface side of the support base body 25. The support blocks 47 and 48 support the various members constituting the Y-axis movement mechanism, so that the Y-axis movement mechanism is lower than the upper ends of the pair of right support wall 26 and left support wall 28. Placed on the side.

  Next, the structure provided in the right support wall 26 and the left support wall 28 will be described. As shown in FIG. 4, at the upper ends of the right support wall 26 and the left support wall 28, there are provided guide mounting surfaces 27 and 29 in the form of a belt in plan view for mounting a Y-axis feed guide 30 (see FIG. 3). It has been.

  In addition, a pair of substantially rectangular parallelepiped column seats 4 and 4 which are pedestals for mounting and fixing the lower portion of the column 5 are provided on both the left and right sides behind the table support base 24 so as to be separated from each other. Yes. A horizontal plate 34 having a trapezoidal shape in plan view is provided between the lower portions of the column seats 4 and 4 and the upper end of the peripheral plate 22. Further, a coolant passage 35 (see FIG. 4) is formed in a tunnel shape below each horizontal plate 34 and discharges the dropped coolant (cutting fluid) from both sides of the table support base 24 toward the rear of the base 2. Each) is formed. Further, between the upper surface of the horizontal plate 34 and the outer surface of the column seat portion 4 that contacts the upper surface of the horizontal plate 34, reinforcing ribs 45, 45 formed in a substantially triangular shape have a predetermined interval. It is provided on both the left and right sides.

  And the base cover 70 is provided in the upper part of the base 2 which consists of the said structure, as shown in FIG.6 and FIG.7. The structure of the base cover 70 will be described with reference to FIGS. As shown in FIG. 10, the base cover 70 is a flange member that is formed in a U-shape in plan view and forms a flange having a concave cross section. The base cover 70 has an eave portion 71 protruding from the front wall 2b of the front end portion of the base 2 into an eave shape, and the rear end portion direction of the base 2 with the table support table 24 sandwiched from both ends on the rear end side of the eave portion 71 It is comprised from the flow-path parts 72 and 72 extended to. As shown in FIG. 6, the base cover 70 has channel portions 72, 72 of the base cover 70 fitted in the storage portions 20, 20 of the base 2 so as to fill the left and right sides of the table support 24, and bolts ( (Not shown). The base cover 70 functions as a scissor that feeds coolant work (cutting fluid) and work chips to the rear of the base 2.

  Next, the structure of the base cover 70 will be described in detail. As shown in FIGS. 8 to 11, the base cover 70 is assembled by bending and welding a metal plate material, and includes an eave portion 71 and a pair of flow path portions 72 and 72. Specifically, as shown in FIGS. 8 to 10, the base cover 70 is connected to the eaves portion 71 extending in the X-axis direction and having a substantially rectangular shape in plan view, and both ends of the eaves portion 71 in the longitudinal direction. The flow path portion 72 extends parallel to the Y-axis direction, and the inclined plate 80 is provided on the lower surface of the eave portion 71 so as to be inclined toward the inner direction of the base 2. The eaves part 71 and the flow path part 72 are welded by a welding part 83. Note that the coolant attached to the inclined plate 80 drops into the base 2.

  The eaves portion 71 includes a front wall portion 79 that is folded at a substantially right angle with a front end portion of an eaves bottom plate 73 that is substantially rectangular in plan view and extends in the X-axis direction. Side wall portions 75 and 75 folded at right angles are formed. Further, the eaves 71 is formed with a rear wall 78 in which an end facing the front wall 79 is folded at a predetermined width and substantially at a right angle.

  In addition, the connecting portion of the eave portion 71 to each flow path portion 72 is formed with an extending portion 71a that is a plate member having the same width as the flow path portion 72 and extending a predetermined length (3 cm as an example). Has been. Conventionally, the extending portion 71a is 1 cm, for example. As shown in FIG. 9, support members 81 and 82 that support the flow path portion 72 are provided at both lower ends of the flow path portion 72.

  The flow path part 72 has a rectangular shape in plan view and extends in the Y-axis direction, and a side wall part 76 in which the outer ends of the flow path part bottom plate 74 are folded at a substantially right angle. And a side wall 77 formed by folding the inner end portion at a substantially right angle with a predetermined width. In addition, an end portion 72a on the eaves portion 71 side of the flow path portion bottom plate 74 is overlapped below the extending portion 71a with a predetermined width and is connected to the extending portion 71a by a welding portion 83. Further, the side wall portions 76 and 77 on the rear end portion 72 b side of the flow path portion 72 are partially cut and lowered so that the rear end portion 72 b of the flow path portion 72 can be inserted into the coolant passage 35. Yes.

  Next, the effect of this Embodiment is demonstrated with reference to FIGS. In the machining center 1, as shown in FIG. 12, the extended portion 71 a of the eave portion 71 is formed longer than the conventional one, and the lower surface side between the extended portion 71 a of the eave portion 71 and the end portion 72 a of the flow path portion bottom plate 74. A connecting portion 72c, which is a connecting portion, is formed so as to be above the inside of the base 2 with respect to the front wall 2b of the base 2. Accordingly, as shown in FIG. 13, the coolant is located near the center of the connecting portion 72c (the XI-XI line in FIG. 12) between the extending portion 71a of the eave portion 71 and the end portion 72a of the flow path portion bottom plate 74. Even if 90 leaks, since it falls to the inside of the base 2 rather than the front wall 2b of the base 2, it is possible to prevent the coolant from leaking to the outside of the base 2.

  As shown in FIG. 14, the coolant 90 leaks near the outside of the connecting portion between the extended portion 71a of the eave portion 71 and the end portion 72a of the flow path portion bottom plate 74 (XII-XII line in FIG. 12). However, since it falls to the inside of the base 2 rather than the front wall 2 b of the base 2, it is possible to prevent the coolant from leaking to the outside of the base 2. Further, in the machining center 1, by using the base cover 70, the eaves portion 71 is not a cast iron but a sheet metal, so that the base 2 can be reduced in size and weight.

  Needless to say, the machine tool of the present invention is not limited to the above embodiment, and various modifications are possible. For example, the extended portion 71a of the eave portion 71 has a connecting portion between the extended portion 71a of the eave portion 71 and the end portion 72a of the flow path portion bottom plate 74 regardless of the length of 3 cm. What is necessary is just to determine suitably to the length which becomes inside the base 2 rather than.

DESCRIPTION OF SYMBOLS 1 Machining center 2 Base 2b Front wall 8 Table 20 Storage part 21 Bottom part 24 Table support stand 35 Coolant passage 70 Base cover 71 Eave part 71a Extension part 72 Flow path part 72a End part 72c Connection part 73 Eave part bottom plate 74 Flow path part bottom plate 75 Side wall part 76 Side wall part 77 Side wall part 79 Front wall part 80 Inclined plate 83 Welding part

Claims (3)

On the base that is the base of the machine tool that processes the workpiece by moving the workpiece and the tool relative to each other,
A support portion for supporting a table portion on which the workpiece is placed;
In a machine tool provided with a base cover that is provided along the support portion and discharges workpiece chips and cutting fluid to the outside of the base,
The base cover is
An eave portion that protrudes from the front end portion of the base into an eave shape and receives the chips and cutting fluid,
A pair of flow path portions that are connected to the eave portion and form flow paths for flowing the chips and cutting fluid along the support portion;
A machine tool, wherein a connecting portion between the eave portion and the flow path portion is formed on the upper side inside the front wall of the base. A plate member extending from the end of the eave portion on the flow path side so as to overlap each of the bottom plates of the pair of flow paths,
The machine tool according to claim 1, wherein a connection portion between the plate member and the bottom plate of the flow path portion is formed on the upper side inside the front wall of the base.   The lower surface of the eave portion includes an inclined plate that is inclined and extended from the lower surface toward the inner side of the front wall in order to allow the leaked cutting fluid to flow inward from the front wall of the base. The machine tool according to claim 1 or 2, characterized in that

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