JP6634490B2 - Centerless grinding machine - Google Patents

Description

  The present invention relates to a centerless grinding machine, and more particularly, to a centerless grinding machine particularly suitable for use in a small installation space.

  As shown in FIG. 7, the centerless grinding machine rotatably supports a workpiece (hereinafter, referred to as a workpiece) W by an adjusting wheel a and a blade b while rotating and driving the workpiece W by a grinding wheel (grinding wheel) c. It grinds the outer peripheral surface, and has a basic configuration in which an adjustment wheel a and a grinding wheel c are arranged on both sides of the work W so as to face each other (for example, see Patent Document 1).

  The adjusting wheel a and the grinding wheel c are provided with dressing devices d and e, respectively, for dressing the grindstone surface, and both of the dressing devices d and e are the right and left of the adjusting wheel a and the grinding wheel c in FIG. Located on both sides.

  Such an arrangement of the centerless grinding machine is generally employed in all types of centerless grinding machines regardless of the size and size of the target workpiece W and the magnitude of the grinding force on the workpiece W. However, such an arrangement has various problems as listed below, and requires a relatively large installation space, which is an obstacle to downsizing and space saving of the centerless grinding machine.

(A) During the positioning operation of the dressing devices d and e with the grinding wheel c and the adjusting wheel a, the constituent devices a, c, d and e are moved in the lateral direction of the grinding machine (the vertical direction in FIG. 7). At the same time, it was necessary to use a sub-operation panel other than the operation panel.

(B) The height adjustment of the work W is performed by changing the thickness of the spacer interposed between the blade b and a work rest (not shown) supporting the blade b with reference to the result of the grinding performed earlier. .

(C) The diamond movement amounts of the dressing devices d and e with respect to the grinding wheel c and the adjusting wheel a are determined by the outer diameter of the workpiece W, the outer diameter of the grinding wheel c and the adjusting wheel a, and the grinding wheel c and the adjusting wheel a. It was calculated from the height of the heart and adjusted manually.

(D) Although not specifically shown, the coolant tank is usually provided separately from the grinding machine, and there is a limit in reducing the installation space of the centerless grinding machine.

  In connection with this point, although not specifically shown, various installation configurations for miniaturizing the centerless grinding machine have been proposed as disclosed in Patent Documents 2 to 5, for example. There was room for further improvement in the radical solution of the points.

JP 2004-114179 A JP 2002-370143 A JP 2004-216518 A JP 2006-123132 A JP 2007-190616 A

  The present invention has been made in view of such a conventional problem, and an object of the present invention is to reduce space and operability by devising an arrangement configuration of each component device around a basic configuration of a grinding machine. It is to provide a centerless grinding machine with good quality.

In order to achieve the above object, a centerless grinding machine of the present invention performs centerless grinding of an outer peripheral surface of a work with a rotationally driven grinding wheel while rotating and supporting the work with an adjustment wheel and a blade, and comprises a grinding wheel and an adjustment wheel. Dressing means for performing a dressing process of the above comprises a single dressing device, this dressing device is provided at a lower position between the grinding wheel and the adjustment wheel, and a coolant for supplying and recovering coolant to the grinding portion The tank also functions as a part of a local cover that covers the grinding unit, and the grinding wheel and the adjustment wheel that constitute the grinding unit are overhanged in one direction from the grinding wheel shaft case, the adjustment axle case, and the vertical slide. And separated from the mechanism and the drive by the partition, and By being coated with stored arranged in the processing chamber, the grinding unit for wetted machining coolant, characterized in that it is isolated and restricted from the mechanism unit and drive unit.

The following configuration is adopted as a preferred embodiment.
The mechanism section and the drive section are covered with an entire cover and stored and arranged in a machine room.

  ADVANTAGE OF THE INVENTION According to the centerless grinding machine of this invention, a workpiece | work outer peripheral surface is centerless-ground-grounded by a grinding wheel which rotates, supporting a workpiece | work by an adjustment wheel and a blade, and performs the dressing process of a grinding wheel and an adjustment wheel. Since the dressing means is composed of a single dressing device, and the dressing device is provided at a lower position between the grinding wheel and the adjusting wheel, various unique effects as listed below are exhibited, It is possible to provide a centerless grinding machine that is space-saving and has good operability.

(1) The dressing means for performing the dressing process of the grinding wheel and the adjusting wheel is composed of a single dressing device, and this dressing device is provided at a lower position between the grinding wheel and the adjusting wheel. The dresser space for the left and right grinding wheels, which had the greatest influence on the width of the centerless grinding machine, is no longer necessary, and the space is saved, and the width of the centerless grinding machine is greatly reduced.

  This makes it possible to provide a desktop-sized small centerless grinder suitable for use in a small installation space and which can be installed in a very narrow installation space such as an office desk.

(2) The dressing device is provided at a lower position between the grinding wheel and the adjustment wheel, and the dressing for the grinding wheel and the adjustment wheel is performed at the work grinding position. Dimensional changes due to thermal displacement during grinding of the adjusting wheel are suppressed, and grinding accuracy can be improved.

  In other words, if the dressing position of the grinding wheel and the adjusting wheel by the dressing device is different from the grinding position of the work by the grinding wheel and the adjusting wheel and is different, the working environment (particularly the atmosphere) at the time of dressing the grinding wheel and the adjusting wheel. Temperature) is different from the working environment at the time of operation of the grinding wheel and the adjusting wheel, that is, at the time of grinding. As a result, a predetermined shape dimensioned by the dressing of the grinding wheel and the adjusting wheel is affected by a dimensional change due to thermal displacement during actual grinding, and a situation occurs in which the grinding accuracy is reduced.

  On the other hand, as in the present invention, since the dressing for the grinding wheel and the adjusting wheel is configured to be performed at the grinding position of the work, the working environment at the time of dressing becomes the same as the working environment at the time of grinding. . As a result, the predetermined shape and shape formed by the dressing of the grinding wheel and the adjusting wheel are not affected by the dimensional change due to thermal displacement even during actual grinding, and the desired high grinding accuracy is not reduced. Can be secured.

(3) The dressing device is provided on a vertical slide together with a blade supporting the work at a lower position between the grinding wheel and the adjusting wheel, and the vertical slide can reciprocate up and down with respect to the bed. With the configuration, the operation of the vertical slide can be automatically controlled, so that the center height adjustment of the work, which was conventionally manually adjusted, and the adjustment of the movement amount of the dresser diagram of the dressing device can be numerically controlled, The time required for the step change can be shortened, and the step change property can be greatly improved.

(4) Structure of the grinding machine A control device for controlling the driving sources of the respective parts in conjunction with each other is provided inside the device mount, so that the control plate conventionally provided outside the centerless grinding machine can be installed inside the grinding machine space. (In-flight).

(5) The coolant tank for supplying and collecting the coolant to and from the grinding unit also functions as a part of a local cover that covers the grinding unit, so that the coolant tank is provided in the grinding machine space. Can be.

(6) By putting the control device and the coolant tank in the space of the grinding machine, the installation space can be reduced, that is, the space can be saved.

(7) The grinding wheel and the adjustment wheel that constitute the grinding unit are arranged in an overhang shape in one direction (forward direction) from the grinding wheel shaft case, the adjustment axle case, and the vertical slide, and the local cover that covers the grinding unit. By being covered, the above-mentioned grinding portion that comes into contact with the processing coolant is limited and isolated from the processing chamber.

  As a result, the drive units of the motors and the mechanical units such as the grindstone shaft case, the adjustment axle case, and the vertical slide are housed in the machine room separated from the processing chamber, and coolant is applied to these mechanical units and the drive units. As a result, the life of the apparatus is improved, and it is not necessary to provide the machine room with a waterproof structure.

(8) The grinding wheel and the adjusting wheel that constitute the grinding unit are arranged in an overhang shape in the forward direction from the grinding wheel shaft case, the adjusting axle case and the vertical slide, and the dressing device is provided between the grinding wheel and the adjusting wheel. By being provided at the lower position, all operations relating to the grinding operation and the dress operation can be performed with almost no movement on the front side of the grinding machine, so that the operability and the set-up characteristics are remarkably improved.

It is a front view showing the whole composition of the centerless grinder which is one embodiment concerning the present invention. It is a side view which shows the whole structure of the same centerless grinder similarly. FIG. 2 is a plan view showing the entire configuration of the centerless grinding machine. It is a perspective view which shows the structure of the principal part of the centerless grinding machine. 5A is an enlarged front view of a dressing device of the centerless grinding machine, FIG. 5A illustrates a standby state during grinding, and FIG. 5B illustrates a dressing state during dressing (grinding wheel dressing). It is a top view which similarly expands and shows the dressing state of the same dressing apparatus. It is a front view which shows the whole structure of the conventional centerless grinder.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same reference numerals indicate the same components or elements throughout the drawings.

  A centerless grinding machine according to the present invention is shown in FIGS. 1 to 6, and is a small centerless grinding machine having a space-saving structure for centerless grinding the outer peripheral surface of a work W, Specifically, the device configuration is a desktop size that can be installed on an office desk or the like.

  The specific configuration of this grinding machine is mainly composed of a grinding wheel 1, an adjustment wheel 2, a blade 3, a dressing device 4 and a control device 5, and the main configuration and its peripheral configuration save space. It has a structure for achieving it.

  First, in the present grinding machine, a bed 11 is mounted and fixed on an apparatus mount 10, and on this bed 11, a grinding wheel shaft case 16 having the grinding wheel 1, an adjustment axle case 26 having the adjustment wheel 2, and the blade 3 and each constituent unit such as the dressing device 4 are provided.

  In the illustrated example, as shown in FIG. 1, the grinding wheel shaft case 16 is provided on the left side and the adjustment axle case 26 is provided on the right side as viewed from the front of the apparatus. May also be employed.

  The grinding wheel 1 has a grinding wheel surface (outer peripheral surface) having a profile corresponding to the final shape of the work W, that is, the final finished shape of the outer peripheral surface, and is detachably mounted and fixed to the tip of the grinding wheel shaft 15 (cantilever). Structure), the grinding wheel shaft 15 is rotatably provided on a grinding wheel shaft case 16.

  The basic configuration of the drive system of the grinding wheel 1 may be a conventionally known one. Specifically, the grinding wheel shaft 15 is rotatably supported by a grinding wheel shaft case 16 mounted on the bed 11. The rear end of the grinding wheel shaft 15 is drivingly connected to a drive motor 18 via a drive transmission mechanism (not shown).

  As shown in FIGS. 1 to 3, the drive motor 18 of the illustrated embodiment is provided in a horizontal state on the front side of the upright portion 16 a of the grinding wheel shaft case 16, and is electrically connected to the control device 5. I have.

  In addition to the illustrated embodiment, the mounting structure of the drive motor 18 may be provided on the rear side of the upright portion 16a of the grinding wheel shaft case 16 according to the purpose. In addition to the shape, it can be mounted in any arbitrary posture such as being provided in an upright or inverted shape according to the purpose.

  Further, the grinding wheel shaft case 16 is provided on the bed 11 so as to be movable at least in the left and right cutting direction X via the grinding wheel slide device 20. In the illustrated embodiment, the left and right cutting direction X and the longitudinal axis It is possible to move (forward / backward) in the direction Y.

  Here, the left-right cutting direction X refers to the direction in which the grinding wheel 1 cuts into the work, and the front-rear axial direction Y refers to the axial direction of the grinding wheel 1 (and the adjusting wheel 2 and the work W). .

  Specifically, the grinding wheel slide device 20 includes a grinding wheel left / right slide 21 and a grinding wheel front / rear slide 22, whereby the grinding wheel shaft 15 is configured to be able to move (forward / backward / backward) in two directions perpendicular to the front / rear and left / right directions. I have.

  The feed operation (forward / backward movement) of the slides 21 and 22 is not specifically illustrated, but is performed by feed means including a guide device, a feed screw unit, and a drive motor as a drive source provided inside the device. It is configured to operate. The drive motor is electrically connected to the control device 5.

  In the illustrated embodiment, the grindstone left-right slide 21 is provided on the bed 11 and the grindstone front-rear slide 22 is provided thereon. However, the reverse arrangement may be adopted according to the purpose.

  The adjusting wheel 2 rotatably supports the outer peripheral surface of the work W. The rotating support surface (outer peripheral surface) has a profile corresponding to the final shape of the work W, that is, the final finished shape of the outer peripheral surface. The adjustment axle 25 is provided on the adjustment axle case 26 so as to be rotatably driven.

  It is desirable that the adjusting axle 25 be slightly inclined to obtain a thrust in the axial direction of the workpiece W during grinding. Although the tilt adjustment of the adjustment axle 25 is not specifically shown, the adjustment axle case 26 is provided with a tilt angle adjustment mechanism at a portion where the adjustment axle case 26 is attached to an adjustment wheel slide device 30 described later. The adjustment axle case 26 may be fixed to the adjustment wheel slide device 30 in a state where the inclination is provided.

  The basic configuration of the drive system of the adjusting wheel 2 may be a conventionally known one. Specifically, the adjusting axle 25 is rotatably supported by an adjusting axle case 26 mounted on the bed 11. At the same time, the rear end of the adjustment axle 25 is drivingly connected to a drive motor 28 via a drive transmission mechanism (not shown).

  As shown in FIGS. 1 and 3, the drive motor 28 of the illustrated embodiment is provided on the rear side of the upright portion 26 a of the adjustment axle case 26 in an inverted state, and is electrically connected to the control device 5. I have.

  In addition to the illustrated embodiment, the mounting structure of the drive motor 28 may be provided on the front side of the upright portion 26a of the adjusting axle case 26, depending on the purpose, and the mounting posture may be inverted as shown in the drawing. In addition to the shape, it can be mounted in any arbitrary posture such as being provided upright or horizontally depending on the purpose.

  The adjustment axle case 26 is provided on the bed 11 via the adjustment wheel slide device 30 so as to be movable in at least the left and right cutting directions X. In the illustrated embodiment, the adjustment axle case 26 is the same as the grinding wheel shaft case 16. It is possible to move (forward and backward) in the left and right cutting directions X and the front and rear axial directions Y.

  Specifically, the adjustment wheel slide device 30 includes an adjustment wheel left / right slide 31 and an adjustment wheel front / rear slide 32, so that the adjustment axle 25 can move (forward / backward / retreat) in two orthogonal directions in the front / rear and left / right directions. It is configured.

  Although not specifically shown, the feeding operation (forward / backward movement) of the slides 31 and 32 is performed by feeding means including a guide device, a feed screw unit, and a driving motor as a driving source provided inside the device. It is configured to operate. The drive motor is electrically connected to the control device 5.

  In the illustrated embodiment, the adjustment wheel left / right slide 31 is provided on the bed 11 and the adjustment wheel front / rear slide 32 is provided thereon. However, the opposite arrangement may be adopted according to the purpose.

  The grinding wheel left / right slide 21 and the adjustment wheel left / right slide 31 provided on the bed 11 are pivoted (shown in the figure) so that the adjustment axle 25 and the grinding wheel shaft 15 can be set substantially parallel to the blade 3 or at a predetermined angle. (Not shown) on the bed 11 so as to be able to adjust the tilt in the horizontal direction.

  The tilt adjustment structure by the pivot may be provided on only one of the grinding wheel left / right slide 21 and the adjustment wheel left / right slide 31 depending on the purpose, or the tilt adjustment structure may be omitted and the device may be omitted. It is also possible to adopt a structure that is adjusted at the time of assembly.

  The blade 3 supports the work W together with the adjusting wheel 2, and is provided on a vertical slide 33 as a support base together with the dressing device 4 as described later. It is attached and fixed to the installed work rest 34.

  The blade 3 linearly extends between the grinding wheel 1 and the adjustment wheel 2 and has a support surface whose upper end surface is inclined downward toward the adjustment wheel.

  Since the blade 3 is provided on the vertical slide 33 and moves up and down together with the dressing device 4, the center height adjustment of the work W can be automatically controlled by numerical control as described later.

  The dressing device 4 is a dressing means for simultaneously or independently performing a dressing step of modifying (dressing) the shape of the outer peripheral grindstone surface of the grinding wheel 1 and a dressing step of modifying (dressing) the outer peripheral grindstone surface of the adjusting wheel 2. It functions and is provided at a lower position between the grinding wheel 1 and the adjusting wheel 2. In the illustrated embodiment, the dressing device 4 is provided at a front lower position between the grinding wheel 1 and the adjustment wheel 2.

  As shown in FIG. 5, the dresser 35 of the dressing device 4 includes a standby position Po (FIG. 5A) located below the grinding wheel 1 and the adjustment wheel 2, and dressing for the grinding wheel 1 and the adjustment wheel 2. The position, that is, the height of the grinding wheel 1 and the axial center height Ph of the adjusting wheel 2 (FIG. 5B) is provided so as to be able to move up and down.

  As shown in FIG. 5A, when the dresser 35 of the dressing device 4 is at the standby position Po, the height of the blade 3 is set so as to support the workpiece W at the grinding position.

  When the dresser 35 is at the dressing position Ph shown in FIG. 5B, the dresser 35 moves in the front-rear axis direction relative to the grinding wheel 1 and the adjustment wheel 2 so that the grinding wheel 1 and the The adjustment wheel 2 is dressed.

  In the illustrated embodiment, the grinding wheel axle case 16 and the adjustment axle case 26 are movable on the bed 11 in the front-rear axis direction X and the left and right cutting direction Y via the grinding wheel slide device 20 and the adjustment wheel slide device 30, respectively. , The dresser 35 of the dressing device 4 is normally at a standby position Po located below the grinding wheel 1 and the adjustment wheel 2 during dressing. During dressing, the dresser 35 And the height of the adjusting wheel 2 or higher, that is, the dressing position Ph, and the grinding wheel 1 and the adjusting wheel 2 cooperate with the movement in the front-rear axis direction X. , While traversing in the axial direction relative to the grinding wheel 1 and the adjusting wheel 2, rotationally supporting the grinding wheel surface of the grinding wheel 1 and the adjusting wheel 2. At the same time or separately to dressing.

  As described above, a specific support structure of the dressing device 4 is provided on the vertical slide 33 together with the blade 3 supporting the work W at a lower position between the grinding wheel 1 and the adjustment wheel 2, as described above. The dressing device 4 is arranged at a front position of the vertical slide 33, and the blade 3 is arranged at a rear position.

  The vertical slide 33 is provided on the bed 11 and is capable of reciprocating up and down with respect to the bed 11. Thus, the dressing device 4 and the blade 3 provided on the vertical slide 33 are moved in the vertical direction by the movement of the vertical slide 33.

  Although not specifically shown, the feed operation (elevation operation) of the vertical slide 33 is performed by feed means including a guide device, a feed screw unit, and a drive motor as a drive source provided inside the device. It has a configuration. The drive motor is electrically connected to the control device 5.

  The dressing device 4 includes, as the dresser 35, a rotary diamond or a rotary dresser having a cylindrical dressing surface formed by bonding diamond abrasive grains with a bonding material. In the illustrated embodiment, the dresser 35a for the grinding wheel and the adjusting wheel are provided. And a pair of rotary dressers of the dresser 35b.

  Specifically, as shown in FIG. 6, the dresser shaft 36 of the dressing device 4 is provided so as to be inclined in the horizontal direction with respect to the axis of the grinding wheel 1 and the adjustment wheel 2, and the dressing shaft 1 is dressed. The dressing machine 35a for dressing the grinding wheel and the dressing machine 35b for dressing the adjustment wheel 2 are mounted at a tip end of a dresser shaft 36 at predetermined intervals in the axial direction (cantilever structure). The dresser 35a and the dressing vehicle dresser 35b are arranged at positions where they do not interfere with each other in the dressing operation.

  The dresser shaft 36 is horizontally rotatable on a dresser shaft case 37 fixed to the front position of the vertical slide 33 with the dresser shaft 36 inclined horizontally with respect to the axis of the grinding wheel 1 and the adjustment wheel 2. It is supported and is drivingly connected via a drive transmission mechanism (not shown) to a drive motor 39 that rotationally drives the dresser shaft 36. The drive motor 39 is electrically connected to the control device 5.

  In place of the drive motor 39 in the illustrated embodiment, for example, a built-in motor (not shown) built in the dresser shaft case 37 is employed to form a direct drive structure. By this, the space of the dresser shaft case 37 can be saved.

  The rotary dresser 35 (the dresser 35a for the grinding wheel and the dresser 35b for the adjusting wheel) rotates the drive motor 39 to rotate both the grinding wheel surface of the grinding wheel 1 and the rotating support surface of the adjusting wheel 2. The dressing is performed simultaneously or individually.

  Specifically, since the dresser shaft 36 is inclined as described above, the single dressing device 4 can include the dresser 35a for the grinding wheel and the dresser 35b for the adjusting wheel. In other words, in FIG. The grinding wheel 1 and the adjusting wheel 2 can be provided with the same function as providing a dedicated rotary dresser for each of the grinding wheel 1 and the adjusting wheel 2 as in the conventional apparatus shown in the drawing, whereby the grinding wheel 1 and the adjusting wheel 2 can be separated by two rotary dressers 35a and 35b. It is also possible to dress at the same time or individually.

  In the present embodiment, the coolant tank 40 for supplying and recovering the coolant to and from the grinding unit also has a function as a part of the local cover 50 that covers the grinding unit (the processing chamber). .

  That is, in the conventional general centerless grinding machine, the coolant tank is configured to be separately provided outside the machine of the grinding machine. However, in the present embodiment, the coolant tank 40 includes the grinding portion, By having a configuration that also functions as a part of the local cover 50 that covers the chamber, it is possible to dispose the apparatus inside a centerless grinding machine, thereby saving space in the apparatus.

  In addition to the above configuration, the grinding wheel 1 and the adjusting wheel 2 are moved in one direction from the grinding wheel shaft case 16, the adjusting axle case 26 and the vertical slide 33 (in the illustrated embodiment, FIGS. 2, 3 and As shown in FIG. 4, it is arranged in an overhang shape in front of the device.

  The grinding portions arranged in an overhang shape are separated by a partition 60 from mechanisms such as the grinding wheel shaft case 16, the adjustment axle case 26 and the vertical slide 33, and the driving portion of motors, and the grinding portion. Is covered with the local cover 50 and stored in the processing chamber A, and the mechanism section and the driving section are covered with the overall cover 61 and stored and disposed in the machine chamber B, so that the above-mentioned liquid is in contact with the processing coolant. The grinding unit is limited and isolated from the mechanism unit and the drive unit (the processing room A and the machine room B are separated).

  The control device 5 automatically controls the driving sources of the components of the centerless grinding machine described above in conjunction with each other, and is in the form of a control panel 55 provided inside the device gantry 10.

  That is, in a conventional general centerless grinding machine, a control panel or an operation panel having a control device is provided independently outside the grinding machine, and a sub-operation panel connected to the operation panel is provided at least in the machine. However, in the present embodiment, it is housed in a control panel 55 provided in the device stand 10 and all controls are performed by the control panel 55, which is conventionally required. Since the sub-operation panel and its related devices can be omitted, the space of the device can be saved and the manufacturing cost can be reduced.

  The control device 5 is, specifically, a CNC device including a microcomputer including a CPU, a ROM, a RAM, an I / O port, and the like.

  The control device 5 includes a control program for executing the grinding process, a control program for executing the dressing process, a control program for adjusting the height of the workpiece W, and adjusting the amount of movement of the dresser diagram of the dressing device 4. The control program or the like to be performed is input and set as numerical control data in advance or as appropriate using a keyboard or the like of the control panel 35 of the apparatus gantry 10.

  Thus, in the centerless grinding machine configured as described above, various specific effects as listed below are exhibited.

(A) Dressing means for performing a dressing step of the grinding wheel 1 and the adjusting wheel 2 comprises a single dressing device 4, and the dressing device 4 is provided at a lower position between the grinding wheel 1 and the adjusting wheel 2. This eliminates the need for dresser spaces for the left and right grinding wheels, which had the greatest effect on the width of the conventional centerless grinding machine, and saves space, thereby greatly reducing the width of the centerless grinding machine.

  This makes it possible to provide a desktop-sized small centerless grinder suitable for use in a small installation space and which can be installed in a very narrow installation space such as an office desk.

(B) The dressing device 4 is provided at a lower position between the grinding wheel 1 and the adjusting wheel 2 so that the dressing of the grinding wheel 1 and the adjusting wheel 2 is performed at the grinding position of the workpiece W (= dressing position Ph). With this configuration, dimensional changes due to thermal displacement during grinding of the grinding wheel 1 and the adjusting wheel 2 are suppressed, and the grinding accuracy can be improved.

  That is, if the dressing positions of the grinding wheel 1 and the adjustment wheel 2 by the dressing device 4 are separated from the grinding positions of the work W by the grinding wheel 1 and the adjustment wheel 2 and are different, the grinding wheel 1 and the adjustment wheel 2 The working environment (particularly the ambient temperature) at the time of dressing is different from the working environment at the time of operation of the grinding wheel 1 and the adjusting wheel 2, that is, the working environment at the time of grinding. As a result, a predetermined shape dimensioned by the dressing of the grinding wheel 1 and the adjusting wheel 2 is affected by a dimensional change due to a thermal displacement during actual grinding, which causes a situation in which grinding accuracy is reduced. I will.

  On the other hand, as described above, since the dressing for the grinding wheel 1 and the adjustment wheel 2 is performed at the grinding position (= dressing position Ph) of the work W, the working environment at the time of dressing is reduced. It is the same as the working environment at the time. As a result, the predetermined shape and dimension shaped by the dressing of the grinding wheel 1 and the adjusting wheel 2 are not affected by the dimensional change due to thermal displacement even during actual grinding, and the expected high grinding accuracy is reduced. It can be secured without.

(C) The dressing device 4 is provided on the vertical slide 33 together with the blade 3 that supports the work W at a lower position between the grinding wheel 1 and the adjustment wheel 2. In addition, the reciprocating movement in the vertical direction allows the operation of the vertical slide 33 to be automatically controlled, so that the center height adjustment of the work W, which has conventionally been manually adjusted, and the dresser of the dressing device 4 can be performed. The adjustment of the movement amount of the diamond can be numerically controlled, the time required for the step change can be shortened, and the step change property can be greatly improved.

(D) Configuration of Grinding Machine The control device 5 for controlling the driving sources of the respective parts in conjunction with each other is provided inside the device mount 10, so that the control plate 55 conventionally provided outside the centerless grinding machine is ground. It can be installed in the board space (inboard).

(E) The coolant tank 40 for supplying and recovering the coolant to and from the grinding unit also functions as a part of the local cover 50 that covers the grinding unit, so that the coolant tank 40 is located in the space of the grinding machine. Can be equipped.

(F) Space saving can be promoted by placing the control device 5 and the coolant tank 40 in the grinding machine space.

(G) The grinding wheel 1 and the adjusting wheel 2 are arranged overhanging in one direction (forward direction) from the grinding wheel shaft case 16, the adjusting wheel shaft case 26 and the vertical slide 33, and the local cover 50 covering the grinding portion. As a result, the grinding portion that comes into contact with the processing coolant is limited and isolated from the processing chamber A.

  As a result, the mechanical units such as the grinding wheel shaft case 16, the adjusting axle case 26, and the vertical slide 33 and the driving units of the motors are accommodated in the machine room B separated from the processing room A. This makes it difficult for the coolant to be applied to the parts, the service life of the device is improved, and there is no need to provide a waterproof structure in the machine room B, so that the manufacturing cost and the device cost can be reduced.

(H) The grinding wheel 1 and the adjusting wheel 2 are disposed in an overhanging shape in the forward direction from the grinding wheel shaft case 16, the adjusting axle case 26 and the vertical slide 33, and the dressing device 4 is mounted on the grinding wheel 1 and the adjusting wheel 2. All operations related to grinding and dressing work can be performed with almost no movement on the front side of the grinding machine, greatly improving operability and setup. I do.

  It should be noted that the above-described embodiment merely shows a preferred embodiment of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope. For example, the following design changes are possible.

(1) In the illustrated embodiment, a cantilever structure in which the grinding wheel 1 and the adjustment wheel 2 are respectively mounted on the tips of the grinding wheel shaft 15 and the adjustment axle 25 is adopted. The grinding wheel 1 and the adjustment wheel 2 may be mounted at the central portion in the axial direction (both-sided structure).

(2) In the illustrated embodiment, the drive motor 18 of the grinding wheel 1 and the drive motor 28 of the adjusting wheel 2 are arranged side by side outside the grinding wheel shaft case 16 and the adjusting wheel shaft case 26. A built-in motor may be employed in place of these external drive motors 18 and 28 to form a direct drive structure. By reducing the size and simplification of the drive mechanism, it is possible to save space and reduce vibration of the grinding wheel shaft case 16 and the adjusting axle case 26.

(3) In the illustrated embodiment, the dressing is performed by moving the grindstone shaft case 16 and the adjusting axle case 26 back and forth, but the dressing may be performed by providing the dresser 35 with a back-and-forth moving mechanism. . In this case, the grinding wheel front-rear slide 22 of the grinding wheel slide device 20 and the adjustment wheel front-rear slide 32 of the adjustment wheel slide device 30 can be omitted, and the number of moving axes can be reduced by one.

(4) In the illustrated embodiment, a grinding wheel dresser 35a for dressing the grinding wheel 1 and an adjustment wheel dresser 35b for dressing the adjustment wheel 2 are attached at predetermined intervals in the axial direction at the tip of the dresser shaft 36. Although a cantilever structure is used, a double-support structure in which the pair of dressers 35a and 35b are attached to the central portion in the axial direction of the dresser shaft 36 can also be adopted.

(5) Instead of the rotary dresser (rotary diamond) 35 in the illustrated embodiment, a point diamond dresser (point diamond) whose tip is made of diamond may be employed. In this case, although not specifically shown, the point diamond dresser is attached and fixed to the left and right sides of the dresser shaft case 37 at positions corresponding to the cylindrical outer peripheral surfaces of the grinding wheel 1 and the adjusting wheel 2, respectively.

(6) In the centerless grinding machine of the illustrated embodiment, the target work W has a relatively small shape and size, and the device structure itself is space-saving. Although the configuration is optimal for a centerless grinding machine having a space structure, the present invention is of course applied to a large centerless grinding machine for grinding a workpiece W having a large shape and size, thereby realizing space saving. be able to.

(7) The centerless grinding machine of the illustrated embodiment can be applied to all types of centerless grinding machines irrespective of the grinding method, such as a through-feed grinding method or an in-feed grinding method.

(8) Although the configuration of the drive system of each unit constituting the centerless grinding machine in the illustrated embodiment is not specifically illustrated, the configuration of a conventionally known drive system is selectively used as appropriate according to the purpose. You.

W Work (workpiece)
A Processing room B Machine room X Left-right cutting direction Y Front-rear axis direction Po Stand-by position Ph Dressing position 1 Grinding wheel 2 Adjustment wheel 3 Blade 4 Dressing device 5 Control device 10 Device stand 11 Bed 15 Wheel shaft 16 Wheel shaft case 20 Wheel slide Device 21 Grinding wheel left / right slide 22 Grinding wheel longitudinal slide 25 Adjusting axle 26 Adjusting axle case 30 Adjusting wheel slide device 31 Adjusting wheel left / right slide 32 Adjusting wheel longitudinal slide 33 Vertical slide 34 Work rest 35 Rotary dresser
35a Dresser for grinding wheel 35b Dresser for adjusting wheel 36 Dresser shaft 37 Dresser shaft case 40 Coolant tank 50 Local cover 55 Control panel 60 Partition wall 61 Overall cover

Claims (2)

A centerless grinding machine that performs centerless grinding of the outer peripheral surface of a workpiece with a grinding wheel that is rotationally driven while rotating and supporting the workpiece with an adjusting wheel and a blade,
The dressing means for performing the dressing process of the grinding wheel and the adjusting wheel comprises a single dressing device, and the dressing device is provided at a lower position between the grinding wheel and the adjusting wheel,
A coolant tank for supplying and recovering the coolant to the grinding unit also functions as a part of a local cover that covers the grinding unit ,
The grinding wheel and the adjustment wheel that constitute the grinding unit are arranged in an overhang shape in one direction from a grinding wheel shaft case, an adjustment axle case, and a vertical slide, and are separated from a mechanism unit and a drive unit by a partition, and the local cover A centerless grinding machine characterized in that the grinding part which is in contact with the processing coolant is limited and isolated from the mechanism part and the driving part by being covered with the steel and stored in the processing chamber . 2. The centerless grinding machine according to claim 1, wherein the mechanism unit and the driving unit are covered by an entire cover and are stored and arranged in a machine room. 3.

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