JP4192605B2 - Cylindrical grinding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a cylindrical grinder that grinds a workpiece rotatably supported around one axis with a grindstone that can move in the longitudinal direction of the workpiece and in a direction crossing the workpiece.
[0002]
[Prior art]
  This type of cylindrical grinder is of a type that can move the wheel head in the longitudinal direction of the workpiece (hereinafter referred to as a workpiece) and the direction that crosses it.barIt is known as a S-type grinder. Japanese Patent Application Laid-Open No. 2002-292546 shows an example of a grindstone traverse type grinding machine. In this known grinding machine, a headstock and a tailstock as work support devices are supported on the bed by supporting both ends of the workpiece so that the workpiece can be rotated about one axis. Further, a traverse guide surface is provided directly on the bed in parallel with the axis, or is provided on a fixed base fixed on the bed, and the movable base is guided movably along the guide surface. A grindstone table that rotatably supports the grindstone is mounted on a movable base so as to be able to advance and retreat in a direction perpendicular to the traverse guide surface. The grinding wheel platform is configured so that it can be fed integrally with the movable base in the longitudinal direction of the workpiece and can move forward and backward on the movable base toward the workpiece.
[0003]
  The portion on the bed immediately below the processing area including the grinding point where the grindstone and the workpiece come into contact is formed as a coolant recovery section where the coolant discharged to the processing area falls, and the coolant recovered in the coolant recovery section is the bed. It flows along the upper inclined passage and is returned to the coolant supply device from the discharge port opened on the upper surface of the bed. Usually, the coolant supply device is arranged separately from the grinding machine and is installed near the side of the bed. The reservoir portion of the coolant supply device is connected to the discharge port by a vinyl pipe, and receives coolant discharged from the upper surface of the bed through the discharge port to the outside of the apparatus.
[0004]
  Furthermore, since the grinding waste tends to accumulate in the coolant recovery part on the bed immediately below the processing area, the coolant is always flowed to the upper surface of the bed so that the grinding waste is positively transferred toward the discharge port. I have to. In particular, in the grinding method in which the amount of coolant used is suppressed to about 10% or less than the conventional amount, it is difficult to generate a vigorous coolant flow on the bed, so it is easy to accumulate grinding debris on the bed directly under the processing area. In order to remove the grinding debris, a coolant flow is always generated on the upper surface of the bed.
[0005]
[Patent Document 1]
          JP 2002-292545 A
[0006]
[Problems to be solved by the invention]
  In the conventional grinding wheel traverse type grinding machine described above, most of the coolant supplied to the machining area falls directly to the coolant recovery part on the upper surface of the bed immediately below the machining area, causing a problem that has a thermal adverse effect on the bed. Has occurred. In particular, when a coolant flow for discharging grinding scraps is formed on the bed, this adverse thermal effect is conspicuous in the thermal deformation of the bed and, in turn, the change in machining dimensions.
[0007]
  In addition, a considerable amount of the coolant that has fallen to the coolant recovery portion stays on the bed before being returned to the reservoir portion of the coolant supply device together with the coolant flow for discharging the grinding waste. For this reason, the coolant supply device must use a large-capacity coolant that also considers the retention amount on the bed as a recovery time lag, and maintains a large amount of contaminated coolant that has reached the end of its service life. It becomes a big burden for the disposal process.
[0008]
  Therefore, the main object of the present invention is to prevent most of the coolant supplied to the processing area from thermally affecting the bed.
[0009]
  Another object of the present invention is a bedaboveThe purpose is to substantially reduce the required coolant capacity by eliminating the stagnation of the coolant and allowing the coolant to be quickly recovered in the reservoir of the coolant supply device.
[0010]
[Means for solving the problems and their functions]
  In order to solve the above-described problem, the invention described in claim 1A coolant recovery hole that extends in the vertical direction directly below the machining area that includes the grinding point where the workpiece and grinding wheel come into contact opens on the bed, communicates with the lower end of this coolant recovery hole, and allows a coolant supply device to be inserted. In the side of the bed, insert the coolant supply device through this side hole, face the coolant receiving part of the recovery device to the coolant recovery hole, and place both ends with the sliding base straddling at least part of the coolant recovery hole Were guided so as to be able to advance and retreat in the second horizontal direction toward the workpiece on the bed, and a grinding wheel base for rotating and supporting the grinding stone was guided on the sliding base so as to be movable in the first horizontal direction which is the longitudinal direction of the workpiece.
[0011]
According to this configuration, most of the coolant supplied to the processing region falls directly into the coolant recovery hole, and is returned to the coolant supply device that has advanced to the lower end of the recovery hole. As a result, not only the coolant flow stays on the upper surface of the bed but also the contact between the bed and the coolant is almost eliminated, so that the bed is freed from the adverse thermal effects of the coolant and the required capacity of the coolant is reduced. Furthermore, since the sliding base that horizontally guides the grindstone table in the longitudinal direction of the workpiece is provided across a part of the coolant recovery hole, the opening area of the coolant recovery hole is enlarged, and the coolant recovery becomes easy. In addition, since both ends of the sliding base are guided on the bed in such a direction that both ends move forward and backward with respect to the workpiece, the guide surface for guiding the grindstone table in the axial direction of the workpiece can approach the workpiece together with the sliding base. The overhanging distance of the wheel head from the wheel is shortened, and the support rigidity of the wheel head is improved.
[0012]
  Claim2According to the invention, the support table having the vertical wall rising upward is provided integrally with the bed, and the first and second support bases that support both ends of the work and at least one of which can rotationally drive the work are provided on the vertical wall. And fixedly supported on the grinding wheel base side.
[0013]
  According to this configuration, the portion of the bed that faces the lower surface of the support table that supports the workpiece is released from the role as the surface on which the support table is mounted. As a result, the coolant recovery hole is expanded to a part of the bed portion facing the lower surface of the support base, the opening area of the coolant recovery hole is further expanded, and the coolant recovery is ensured.
[0014]
  Preferably, the claim3The lower end part of the coolant recovery hole and the horizontal hole communicating with the recovery hole was opened to the installation floor surface. As a result, the coolant supply device is moved on the installation floor and inserted from the lateral hole, and the coolant receiving portion is advanced just below the coolant recovery hole. This facilitates the incorporation of the coolant supply device into the cylindrical grinder.
[0015]
  More preferably, the claims4The coolant recovery hole has a rectangular shape when viewed in plan, and the length of the coolant recovery hole in the first horizontal direction (workpiece longitudinal direction) supports the longest workpiece that can be machined by this cylindrical grinder. In such a state, the length of the coolant recovery hole opens just below both ends of the longest workpiece, and the second horizontal direction (direction toward the workpiece) of the coolant recovery hole is the machining position at which the workpiece is ground. In such a state that the coolant recovery hole exists in the lower surface of the slide base when the slide base is advanced.
[0016]
  According to this configuration, even when any end of the longest workpiece is ground, the coolant recovery port is opened below the grinding point in this state, and at the same time, the coolant is moved below the sliding base that has moved forward. The recovery port is open, so that coolant recovery is further ensured.
[0017]
  Claim5In the invention described in (1), a pair of bearing portions that support the grindstone on both sides are provided on the grindstone support portion at the front end of the grindstone base.
[0018]
  According to this configuration, since the support rigidity of the grindstone by both-end support is improved, a grindstone shaft having a small diameter can be used, and the width of the pair of bearing portions in the workpiece longitudinal direction can be shortened. This makes it possible to narrow the width of the grindstone support, and allow the grindstone support to penetrate between the work support platforms even when machining the shortest workpiece.Is possibleIt becomes ability. In this case, a grindstone having a small diameter can be used, and the portability of the grindstone in the grindstone replacement work is improved.
[0019]
  Claim6In the invention described in the above, the sliding base is guided so that both ends thereof can advance and retreat in the second horizontal direction above the grinding point where the grindstone and the workpiece are engaged, and the grindstone base is suspended from the sliding base. The first horizontal direction was guided so as to be able to advance and retreat, and the guide means of the sliding base and the grindstone table were arranged above the grinding point.
[0020]
  With this configuration, the coolant scattered from the machining area is less likely to enter the sliding base and grinding wheel guide means disposed above the grinding point, and damage to these guiding means is substantially eliminated. .
[0021]
  Claim7In the invention described in the above, the rear part is opened in a plan view of the bed, and a central concave space is formed in a U shape used as a coolant recovery space, and a coolant supply device is inserted from the opened rear part. The receiving portion of the coolant supply device is disposed in the central concave space, and the grinding wheel base unit is provided with a sliding base that is guided so that both end portions can move in the second horizontal direction on the bed across the concave space.
[0022]
  According to this configuration, the concave space in the center of the bed functions as an enlarged coolant recovery space, and it is easy to incorporate the coolant supply device in this space.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
  1 to 3 are a schematic plan view, a right side view, and a cross-sectional view taken along line AA of FIG. 2 of a numerically controlled cylindrical grinder embodied as a first embodiment of the present invention. In these drawings, reference numeral 10 denotes a bed, and a work support device 11 is disposed on the front portion (downward in the drawing) of the bed 10. An L-shaped support table 12 constituting the work support device 11 extends over the entire width of the bed 10, and the support table 12 is fixed to the upper surface of the bed 10 at the base portion 12 </ b> A. The support table 12 includes a vertical wall 12B extending upward from the base 12A, and a headstock 13 serving as a first support base and a tailstock 14 serving as a second support base are arranged in a horizontal direction on a vertical surface of the vertical wall 12B. The first horizontal direction is spaced apart. That is, the front side of the headstock 13 and the tailstock 14 are formed as the attachment reference surfaces 13F and 14F, and the attachment reference surfaces 13F and 14F are fixed to the vertical wall 12B. The headstock 13 is fixedly installed, and the tailstock 14 is provided so as to be able to advance and retract in the direction toward the headstock 13 according to the length of the workpiece W, and is configured to be fixed at the adjusted position. .
[0025]
  The head stock 13 rotatably supports a main shaft 16 that is rotated by a servo motor 15, and supports one end of a workpiece W by a center 17 that is fitted to a tip facing the tailstock 14. On the other hand, the tailstock 14 supports a tailstock 19 that is rotated by a servo motor 18 so as to be rotatable about an axis common to the spindle 16, and a center 20 that is fitted to the tip on the spindle stock 13 side to support the workpiece W. Supports the other end. In this case, the tailstock shaft 19 can be advanced and retracted in the axial direction by a cylinder device (not shown), and is normally pressed against the headstock 13 by a compression spring (not shown), and the workpiece is moved by a spring force against the main shaft 16 that does not move axially. W is pressed in the axial direction. The servomotors 15 and 18 are synchronously controlled by a CNC device (not shown), and both ends transmitting the rotational force of the servomotors 15 and 18 to the workpiece W by the frictional force that the centers 17 and 20 press against the center holes at both ends of the workpiece W. A drive mechanism is configured.
[0026]
  A truing device 25 is provided on the surface of the head stock 13 opposite to the mounting reference surface 13F. This device 25 fixes a truer T as a truing tool to the tip of a not-illustrated truer shaft rotated by a motor 26, and trues a grindstone G, which will be described later, with the rotated truer T to regenerate the grinding ability of the grindstone G. To do.
[0027]
  A grinding wheel base unit 30 is disposed on the upper surface of the rear portion of the bed 10. The unit 30 includes a sliding base 31 and a grindstone base 32. On both sides of the bed 10 in the left-right direction, a pair of linear guide rails 33 extend horizontally from the center part to the rear part in the front-rear direction (second horizontal direction). Each guide rail 33 slidably guides a pair of front and rear bearing blocks 34, and these bearing blocks 34 are fixed to the lower surfaces of the end portions of the sliding base 31 in the left-right direction. Thus, the sliding base 31 is mounted on the bed 10 so as to be able to advance and retract in the front-rear direction (second horizontal direction).
[0028]
  A pair of linear guide rails 36 that are separated in the front-rear direction and extend in the left-right direction are fixed on the upper surface of the slide base 31, and a pair of left and right bearing blocks 37 are slidably guided by the guide rails 36. The grinding wheel base 32 couples a pair of bearing blocks 37 on the front guide rail 36 on the front lower surface, and couples a pair of bearing blocks 37 on the rear guide rail 36 on the rear lower surface. It is guided so as to be able to advance and retract in the left-right direction (first horizontal direction).
[0029]
  The advancing / retreating device that feeds the sliding base 31 in the front-rear direction includes an X-axis feeding mechanism 40 that is arranged in parallel with the pair of linear guide rails 33 and at a substantially intermediate position therebetween. The mechanism 40 includes a servo motor 41 attached to the rear portion of the bed 10, a feed screw 42 rotated by the servo motor 41, and a nut 43 screwed into the screw and attached to the lower surface of the sliding base 32. The sliding base 31 and the grindstone base 32 are moved forward and backward in the front-rear direction by the rotation of the servo motor 41.
[0030]
  On the other hand, the device for traverse-feeding the grindstone platform 32 in the left-right direction on the sliding base 31 includes a Z-axis feed mechanism 45 disposed in parallel with the pair of linear guide rails 36 and at a substantially intermediate position therebetween. The mechanism 45 includes a servo motor 46 attached to the right end of the sliding base 31, a feed screw 47 rotated by the servo motor 46, and a nut 48 screwed into the screw and attached to the lower surface of the grindstone base 32. The wheel head 32 is traversed in the Z-axis direction by the rotation of the servo motor 46.
[0031]
  The grinding wheel base 32 includes a bearing mechanism 50 that rotatably supports the grinding wheel G at the front portion thereof. As illustrated in detail in FIGS. 4 and 5, the bearing mechanism 50 includes a pair of bearing portions 51 </ b> L and 51 </ b> R on the left and right sides with the grindstone insertion space interposed therebetween. The grindstone shaft that fits in the taper hole in the center of the base of the grindstone G so that the grindstone G can be detachably fixed is configured such that the opposite ends can be integrally coupled and separated by a known detachment mechanism. The base of the grindstone G is fixed.
[0032]
  That is, the grindstone shaft is a combination of the left grindstone shaft 52 and the right grindstone shaft 53, and the grindstone G can be detached from the grindstone base 32 by separating the left grindstone shaft 52 leftward from the right grindstone shaft 53. It is said. For this reason, the left grindstone shaft 52 is rotatably supported by a radial fluid bearing, and the right grindstone shaft 53 is supported by a radial fluid bearing and a thrust fluid bearing so that the axial movement is restricted and rotatable. ing. A pulley 55 is fixed to the outer end of the right grindstone shaft 53, and is connected to a pulley 57 of a built-in motor 56 built in the central portion of the grindstone base 32 via a belt 58, and is driven to rotate by the built-in motor 56. As the grindstone G, a CBN grindstone in which an abrasive grain layer made of cubic boron nitride particles is formed on the outer periphery of a disk-shaped metal base metal is used.
[0033]
  1 to 3 again, a rectangular coolant recovery hole 10A is opened on the upper surface of the bed 10 at a central position in the width direction and at a position close to the front (downward in the drawing) in the depth direction. The coolant recovery hole 10A passes through the bed 10 vertically and opens on the lower surface. As shown in FIG. 2, a lateral hole 10 </ b> B having a rectangular cross section (see FIG. 3) opens, intersects with and communicates with the recovery hole 10 </ b> A. The lower surface of the horizontal hole 10B is opened to the lower surface of the bed 10, whereby the horizontal hole 10B faces the floor surface over the entire length.
[0034]
  The coolant supply device 80 can be moved on the installation floor F by the rotating wheel 81, the horizontal reservoir portion 80A is inserted into the horizontal hole 10B from the rear portion of the bed 10, and the coolant receiving portion 80B is directly below the coolant recovery hole 10A. I ’m here. The coolant supply device 80 includes a supply unit 80 </ b> C composed of a pump unit (not shown) driven by the electric motor 82, and supplies the coolant from the supply pipe 83 to the coolant nozzle device 85 installed on the grindstone base 32 via the flexible pipe 84. To do. As a result, the coolant supplied from the tip nozzle 85A of the nozzle device 85 to the processing region centered on the grinding point falls directly into the recovery hole 10A, and a part thereof is guided by the funnel member 86 to the coolant receiving portion 80B. It flows in and returns to the coolant supply device 80.
[0035]
  In the drawing, reference numeral 80D denotes a grinding waste discharging portion, and the grinding waste is discharged from the coolant supply device 80 to the recovery hopper 87.
[0036]
  The width (first horizontal direction length) of the recovery hole 10A on the upper surface of the bed 10 needs to be about ¼ of the width of the bed 10, and is preferably set to about ½ of the width of the bed 10 or this grinding. When the longest work that can be machined is mounted between the headstock 13 and the tailstock 14, when the grindstone G grinds the vicinity of the end of the work, a recovery hole 10A exists immediately below the grinding point. It is made such a width. Further, the length in the depth direction of the recovery hole 10A on the upper surface of the bed 10 is such that the front end of the recovery hole 10A extends forward from the axis of the main shaft 16, and the rear end of the recovery hole 10A extends in the front-rear direction of the sliding base 31 advanced to the grinding position. It protrudes to a substantially intermediate position, and is preferably selected to be 1/3 to 1/2 of the length of the bed 10 in the X-axis direction.
[0037]
  In order to ensure such a depth of the recovery hole 10A, the central portion in the width direction of the support base 12 is recessed, and as shown in FIG. 1, the centers 17, 20, the main shaft 16, the tailstock shaft 19, etc. The work support system includes a part of the head stock 13 and the tailstock 14 and belongs to the recovery hole 10A in a plane. The front ends of the pair of linear guide rails 33 that guide the sliding base 31 in the front-rear direction extend forward beyond the rear end edge of the recovery hole 10A. When the sliding base advances and the grinding wheel base 32 is in the grinding position, the sliding base 31 has a positional relationship across the recovery hole 10A on the recovery hole 10A. The amount of overhang is maintained at a predetermined distance.
[0038]
  In the first embodiment configured as described above, the grindstone G is positioned and fed in the longitudinal direction (first horizontal direction) of the workpiece W by the operation of the servo motor 46 controlled by a CNC device (not shown). Similarly, the grindstone G is cut and fed in the radial direction (second horizontal direction) of the workpiece W by the operation of the servo motor 41 controlled by the CNC device.
[0039]
  In the case of traverse grinding, for example, the traverse position of the grindstone base G is controlled so that the grindstone G is aligned with one end of the workpiece W, and then the sliding base 31 is advanced so that one end of the workpiece W is ground by the grindstone G. Then, the grinding wheel base 32 is reciprocated on the sliding base 31 to grind the surface in the longitudinal direction of the workpiece W. Each time the grindstone G reaches one end or the other end of the workpiece W, the sliding base 31 is advanced by a predetermined cutting amount, and this cutting feed and traverse feed are repeatedly executed to grind the entire longitudinal region of the workpiece W. go.
[0040]
  In the case of plunge grinding, the position of the grinding wheel base 32 in the longitudinal direction of the workpiece W is controlled to specify the grinding position in the longitudinal direction of the workpiece W, and then the sliding table 31 is fed forward to perform plunge grinding.
[0041]
  During the above-described traverse grinding and plunge grinding, the coolant is discharged from the nozzle 85A shown in FIG. 2 toward the machining area centered on the grinding point that is the contact point between the workpiece W and the grindstone G. The coolant falls directly into the collection hole 10 </ b> A that is greatly opened just below the machining area and is immediately collected by the coolant supply device 80. In the present embodiment, the amount of coolant staying on the bed 10 as in the prior art is substantially zero, and the staying time on the bed 10 after being discharged from the nozzle 85A until being recovered by the coolant supply device 80. Therefore, the coolant supply device 80 having a small capacity can be used, so that the maintenance cost of the coolant can be reduced.
[0042]
  Further, during the grinding process in which the grindstone G is in contact with the surface of the workpiece W, the sliding base 31 is in a position straddling the recovery hole 10A, and the coolant can also flow in and drop below the sliding base 31, so that the coolant can be recovered. It becomes easy. In this case, the amount of overhang of the bearing mechanism 50 with respect to the sliding base 31 is kept to a minimum at the same time in such a manner that the sliding base 31 advances to a position straddling the coolant recovery hole 10A so as not to prevent coolant recovery. Therefore, the rigidity with respect to the grinding resistance of the grinding wheel base unit including the sliding base 31 and the grinding wheel base 32 is maintained firmly, and the grinding accuracy of the workpiece is maintained high. In other words, in a conventional cylindrical grinder equipped with a grindstone base that moves back and forth on a sliding base that moves left and right, when the sliding base is arranged to reduce the amount of overhang of the grindstone base with respect to the sliding base, the sliding base recovers the coolant. In the case of trying to ensure coolant recovery, the amount of overhang hangs, and both cannot be resolved as a contradiction, but according to the present embodiment, the above-described configuration solves this problem is doing.
[0043]
  Further, the coolant discharged to the processing region flows into the recovery hole 10A that is largely open, so that the amount of flow on the surface of the bed 10 is reduced, and the adverse thermodynamic influence of the coolant on the bed 10 may be reduced. it can.
[0044]
  In particular, in the present embodiment, the bearing mechanism 50 provided at the front portion of the grindstone base 32 is configured to support both ends with a pair of left and right bearing portions 51L and 51R arranged on both sides of the grindstone G. As a result, the bearing rigidity is improved as compared with a conventional grinder with a grindstone fixed to a cantilever grindstone shaft. This allows the grinding wheel shafts 52 and 53 to be reduced in diameter and shortened, and the bearing mechanism 50 to be reduced in size including the width direction in the left and right directions, thereby enabling the use of a grinding wheel G with a small diameter and easy handling of the grinding wheel G when changing the grinding wheel. In addition, such a so-called concave cam grinding can provide advantages such as being applicable to grinding of the concave portion on the outer periphery of the workpiece which causes interference.
[0045]
  In the case of truing of the grindstone G, the grindstone G is positioned on one side of the truer T, and after the sliding base 31 is advanced so as to give a predetermined truing incision amount, the grindstone G reciprocates across the truer T. Thus, the feed movement of the grinding wheel base 32 is controlled. As clearly shown in FIG. 1, the truer T is arranged above the recovery hole 10A, so that when the grindstone G is trued, the coolant discharged toward the contact point between the two is collected in the recovery hole 10A directly below. Can fall into the water.
[0046]
(Other embodiments)
Next, a second embodiment of the present invention will be described with reference to FIGS.
[0047]
  In the second embodiment, the sliding base 31 is advanced and retracted in the front-rear direction above a horizontal plane (hereinafter referred to as an axial inclusion horizontal plane) including the rotation axis of the workpiece W and the rotation axis of the grindstone G. Configured as follows. The left and right side surfaces and the rear surface of the bed 10 from approximately the center in the front-rear direction to the rear are extended higher than the axial comprehensive horizontal plane, and form a vertical wall 10U that is continuous in an inverted U shape when viewed in plan. A guide rail 33 is fixed to the top surface of the parallel portion of the vertical wall portion 10U. The pair of bearing blocks 34, 34 running on the guide rails 33 are fixed to the lower surfaces of both ends, and the sliding base 31 is moved back and forth in the second horizontal direction along the guide rails 33. The grinding wheel base 32 is mounted on the sliding base 31 in a suspended state, and is traversed in the first horizontal direction along the longitudinal direction of the sliding base 31.
[0048]
  More specifically, a pair of front and rear straight guide rails 36 extending in the left-right direction are fixed to the lower surface of the sliding base 31. The grinding wheel base 32 is fixed to a front upper surface and a rear upper surface of a pair of left and right bearing blocks 37 that are moved along each of the rails 36, and is moved forward and backward along the rails 36. In this case, the Z-axis feed mechanism 45 includes a servo motor 46 disposed between the guide rails 36 that are separated from each other on the lower surface of the sliding base 31, a feed screw 47, and a nut 48. The interior of the vertical wall portion 10U that surrounds the grinding wheel base 32 is greatly squeezed to define the movement space of the grinding wheel base 32, and at the same time, also serves as a splash cover for preventing coolant from splashing.
[0049]
  In the second embodiment, the above-described configuration prevents the coolant and grinding dust from being scattered on the guide rails 33 and 36, and the guide performance of the sliding base 31 and the grindstone base 32 is extended over a long period of time. Features that can be maintained with high accuracy. Other configurations are the same as those of the first embodiment, and the same functional members are denoted by the same reference numerals.
[0050]
  Furthermore, a third embodiment according to the present invention will be described with reference to FIGS. In the third embodiment, the bed 10 is formed in a U shape in plan view, and a coolant recovery space 10S is formed from the rear part to the front. The collection space 10S is open to the upper and lower surfaces of the bed 10 over the entire front-rear direction starting from the rear end surface of the bed 10. The horizontal reservoir portion 80A of the coolant supply device 80 is inserted into the recovery space 10S, and is arranged so as to recover the coolant falling from the processing region via the funnel member 86.
[0051]
  Straight guide rails 33 are fixed to the top surfaces of the pair of parallel vertical wall portions 10 </ b> V of the bed 10. The sliding base 31 extends across both the vertical wall portions 10 </ b> V, and is fixed to the bearing blocks 34 at the lower surfaces of both end portions so that the sliding base 31 can move forward and backward along the guide rails 33. In this case, the X-axis feed mechanism 40 includes two sets of left and right, and each set includes a servo motor 41L (41R), a feed screw 42L (42R), and a nut 43L (43R). The nuts 43 </ b> L and 43 </ b> R are fixed to nut holder portions that protrude from both side surfaces of the sliding base 31.
[0052]
  Thereby, when both servomotors 41L and 41R are synchronously controlled, the sliding base 31 and the grindstone base 32 mounted thereon are advanced and retracted in the front-rear direction. Further, when a minute rotation amount deviation is intentionally given between the servo motors 41L and 41R, the grindstone base 32 and the grindstone G can be tilted by a minute angle in the horizontal plane, and the partial wear in the width direction of the grindstone G can be corrected, Conversely, a taper can be positively formed on the workpiece surface.
[0053]
  Other configurations are the same as those of the first embodiment, and the same functional members are denoted by the same reference numerals.
[0054]
  In this embodiment, the coolant recovery space 10S can be increased, and the coolant recovery area can be expanded to ensure coolant recovery. The degree of freedom in selecting the coolant recovery means provided in the recovery space 10S is great, and when a vertical supply device having a deep storage tank is used, this device can be accommodated in the recovery space 10S and is necessary for the installation of this cylindrical grinder. The floor area can be reduced.
[0055]
  In this embodiment, instead of the two sets of X-axis feed mechanisms arranged on the left and right sides, the rear ends of both vertical wall portions 10V are connected by a cross beam, and one set of X-axis is provided at the intermediate portion of the cross beam. The modification which arrange | positions the axis | shaft feed mechanism 40 is employable.
[0056]
(Other variations)
As the X-axis feed mechanism 40 in the first and second embodiments, a modification in which two sets of X-axis feed mechanisms 40 are arranged on both ends of the sliding base as in the third embodiment shown in FIG. An example can be adopted.
[0057]
  A modification in which one or both of the X-axis feed mechanism 40 and the Z-axis feed mechanism 45 in each embodiment and each modification described above is a linear motor drive mechanism can be employed.
[0058]
  The work support device has been exemplified by the dual-center drive system, but a combination of a dead center type headstock with a general work drive face plate and a dead center type tailstock can be adopted. It can be configured only with a spindle head with a workpiece gripping chuck without using a base.
[0059]
  The grindstone base 32 employs a double-sided bearing type, but a well-known cantilevered bearing type grindstone can also be employed.
[0060]
  The guide mechanism of the sliding base 31 and the grindstone base 32 is composed of a linear guide rail and a bearing block, but it can be replaced by a sliding bearing type linear guide mechanism or a hydrostatic bearing type linear guide mechanism.
[0061]
  The horizontal hole 10B or the accommodating space 10S into which the coolant supply device 80 is inserted or accommodated is opened on the rear surface of the bed, but may be opened from the left side surface or the right side surface of the bed. You may make it open from the front side.
[0062]
  As a workpiece to be machined, various workpieces to be machined in various rotational states such as a cylindrical rod-like workpiece, a camshaft, and a crankshaft are targeted.
[0063]
【The invention's effect】
  As detailed above, according to the present invention,Most of the coolant supplied to the machining area falls directly into the coolant recovery hole, and is returned to the coolant supply device that has advanced to the lower end of the recovery hole. As a result, not only the coolant flow stays on the upper surface of the bed but also the contact between the bed and the coolant is almost eliminated, so that the bed is freed from the adverse thermal effects of the coolant and the required capacity of the coolant is reduced. Furthermore, with the sliding base straddling at least a part of the coolant recovery hole, both ends of the sliding base advance and retreat in the direction toward the workpiece on the bed. Since the wheel head is provided so that it can be traversed in the longitudinal direction of the workpiece on this sliding base, there is a recovery hole below the sliding base when the sliding base is advanced to the grinding position. Thus, the coolant can be easily collected, while the mechanical rigidity against the grinding resistance can be maintained firmly without increasing the amount of overhang in the forward direction of the grindstone with respect to the sliding base.
[0064]
  Claim2According to the invention described in (1), the first and second support tables that support the workpiece are supported on the side surface opposite to the surface facing the grindstone table, and the lower surface is open. A coolant recovery hole can be formed immediately below the bed portion, that is, the workpiece being processed, thereby ensuring coolant recovery.
[0065]
  Claim3According to the invention described in the above, the coolant recovery hole penetrates the bed and opens on the upper and lower surfaces, and the coolant supply device can move on the installation floor surface and enter the coolant directly from the lateral hole. The coolant supply device is easy to equip, and the required floor space of the grinding machine can be reduced.
[0066]
  Claim4According to the invention described in (1), the coolant recovery hole is rectangular when viewed in plan, and the width is opened directly below both ends of the workpiece even when the longest workpiece that can be processed by the cylindrical grinding machine is attached. Since the width is set to such a depth and the depth dimension is set to be formed on the lower surface of the sliding base at the grinding advance position, the recovery of the coolant is further ensured.
[0067]
  Claim5According to the invention described in the above, since the grindstone bearing mechanism is downsized by supporting the grindstone on both sides, and this grindstone bearing mechanism can be advanced between the first and second workpiece support bases, Therefore, it is easy to replace the grindstone, and it is possible to grind a workpiece having a small concave portion on the outer periphery.
[0068]
  Claim6According to the invention described in the above, the guide mechanism of the sliding base is disposed above the grinding point, and the grinding wheel base is mounted so as to be able to traverse in a suspended state from the sliding base. The mechanism is higher than the grinding point, and it is possible to prevent the trouble that the coolant splashed from the grinding point enters the guide mechanism.
[0069]
  Claim7According to the invention described above, the bed is formed in a U-shape when viewed in plan, and the coolant supply device is arranged in this space with the central concave space as the coolant recovery space. Thus, recovery is further facilitated, and installation of the coolant supply device is facilitated.
[Brief description of the drawings]
FIG. 1 is a schematic plan view of a numerically controlled cylindrical grinder as a first embodiment according to the present invention.
FIG. 2 is a right side view of the first embodiment.
3 is a cross-sectional view of the first embodiment taken along line AA in FIG.
FIG. 4 is a partial cross-sectional view showing the bearing portion of the grindstone table of the first embodiment in a cutaway manner.
FIG. 5 is a right side view of the grinding wheel base according to the first embodiment.
FIG. 6 is a schematic plan view of a numerically controlled cylindrical grinder as a second embodiment according to the present invention.
FIG. 7 is a right side view of the second embodiment.
FIG. 8 is a cross-sectional view of the second embodiment taken along line BB in FIG.
FIG. 9 is a schematic plan view of a numerically controlled cylindrical grinder as a third embodiment according to the present invention.
FIG. 10 is a right side view of the third embodiment.
[Explanation of symbols]
  W: Workpiece, 10: Bed, 10A: Coolant recovery hole, 10B: Horizontal hole, 10U, 10V: Vertical wall, 10S: Coolant recovery space, 12: Support table, 13: Headstock
14: Tailstock, G: Grinding wheel, 30: Grinding wheel base unit, 31: Sliding base, 32: Grinding wheel base, 50: Grinding wheel bearing mechanism, 51L, 51R: Bearing part, 52, 53: First and second grinding wheels axis,
56: Built-in motor, 15, 18, 41, 46: Servo motor, 80: Coolant supply device, 80A: Reservoir unit, 80B: Coolant receiving unit, 80C: Coolant supply unit, 85A: Nozzle,
F: Installation floor

Claims (7)

A bed, a workpiece support device for rotatably supporting the workpiece around a horizontal axis on the bed, and a first horizontal parallel to the horizontal axis on the bed while rotating and supporting a grinding wheel for grinding the workpiece. In a cylindrical grinder comprising a grinding wheel base unit guided so as to be movable in a second horizontal direction across the direction and the horizontal axis,
Opening a coolant recovery hole in the bed extending in the vertical direction directly below the grinding region where the grindstone and the workpiece contact,
A lateral hole that communicates with the lower end of the coolant recovery hole and allows the coolant supply device to be inserted is opened in a side surface of the bed, and the coolant supply device is inserted from the lateral hole so that the coolant receiving portion of the recovery device is connected to the coolant. Face the recovery hole,
The grindstone base unit has a sliding base that is guided so that both ends thereof can advance and retreat in the second horizontal direction on the bed in a state of straddling at least a part of the coolant recovery hole. A cylindrical grinding machine characterized by comprising a grinding wheel base that is guided so as to be movable in one horizontal direction and that rotatably supports the grinding wheel. The workpiece support device includes a support table that is integrally provided with the bed on the front side of the bed and extends upward, and extends in the first horizontal direction, and the vertical wall is on the side of the grindstone platform. The first and second support bases provided with driving means for rotating and supporting the work, and being spaced apart in the first horizontal direction so as to rotatably support and support both ends of the work. The cylindrical grinding machine according to claim 1 , wherein the lower sides of the first and second support bases are opened. The coolant recovery hole penetrates from the upper surface to the lower surface of the bed in the vertical direction and is opened to the installation floor surface of the cylindrical grinder, and the lateral hole penetrates the coolant supply device moved on the installation floor surface. cylindrical grinding machine according to claim 1 or 2, characterized in that acceptable face the coolant receiving portion directly below the coolant recovery holes a. The coolant recovery hole is rectangular in plan view, and the length of the coolant recovery hole in the first horizontal direction is the same even when the work support device supports the longest work that can be processed by the cylindrical grinder. The length of the coolant recovery hole in the second horizontal direction is set to advance to the grinding position where the grindstone grinds the workpiece, while the recovery hole is set to open directly under both ends of the longest workpiece The cylindrical grinder according to any one of claims 1 to 3 , wherein the cylindrical grinder is set to have a size facing the lower surface of the sliding base. A pair of bearing portions are provided on both sides of the grindstone to support the grindstone rotatably on both sides of the grindstone on an axis parallel to the first horizontal direction. The cylindrical grinding machine according to any one of 1 to 4 . The sliding base is guided so that both ends of the sliding base can advance and retreat in the second horizontal direction above the grinding point where the grindstone and the workpiece are engaged, and the grindstone base is suspended from the sliding base in the first state. The guide means on the bed for guiding the slide base and the guide means on the slide base for guiding the grinding wheel base, which are guided so as to be able to advance and retreat in the horizontal direction, are arranged above the grinding point. The cylindrical grinder according to any one of claims 1 to 5 .   A bed, a workpiece support device for rotatably supporting the workpiece around a horizontal axis on the bed, and a first horizontal parallel to the horizontal axis on the bed while rotating and supporting a grinding wheel for grinding the workpiece. In a cylindrical grinder comprising a grinding wheel base unit guided so as to be movable in a second horizontal direction crossing the horizontal axis and the horizontal axis, the rear portion is opened in a plan view of the bed, and the central concave space is a coolant recovery space The coolant supply device is inserted from the opened rear portion and the receiving portion of the coolant supply device is disposed in the central concave space, and the grindstone base unit straddles the concave space. A cylindrical grinding machine comprising a sliding base whose both ends are guided to be movable in the second horizontal direction on the bed.

Images