JP2019010729A - Centerless grinder - Google Patents

Abstract

To provide a space-saving good operational centerless grinder by contriving the arrangement constitution of each configuration unit around the basic constitution of the grinder.SOLUTION: In a centerless grinder, dressing means carrying out the dressing process for a grind stone 1 and a regulating wheel 2 comprises a single dressing unit 4, and the unit 4 is provided at a lower side position between the stone 1 and the wheel 2. Thereby, it eliminates the need for a dresser space for left and right grind stones having the largest influence on the lateral width dimension of a conventional centerless grinder to achieve space saving and thus, that lateral width dimension is significantly reduced. Besides, a coolant tank 40 for feeding or recovering a coolant to or from a grinding part has at the same time, a function as a part of a local cover 50 covering the grinding part. Thereby, the coolant tank 40 can be equipped in a grinder space to achieve space saving of equipment.SELECTED DRAWING: Figure 1

Description

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

  As shown in FIG. 7, the centerless grinding machine is configured to support a workpiece (hereinafter referred to as a workpiece) W by a grinding wheel (grinding wheel) c that is rotationally driven while the workpiece W is rotated and supported by an adjustment wheel a and a blade b. The outer peripheral surface is ground, and includes a basic configuration in which the adjustment wheel a and the grinding wheel c are arranged opposite to each other across the workpiece W (see, for example, Patent Document 1).

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

  Such an arrangement configuration of centerless grinders is generally adopted for all types of centerless grinders regardless of the size of the shape of the workpiece W and whether the grinding force on the workpiece W is large or small. However, such an arrangement has various problems as listed below, and requires a relatively large installation space, which has been an obstacle to downsizing and space saving of the centerless grinding machine.

(A) When aligning the dressing devices d and e with the grinding wheel c and the adjustment wheel a, the component devices a, c, d, and e are moved in the lateral direction of the grinding machine (vertical direction in FIG. 7). In addition, it is necessary to use a sub operation panel other than the operation panel.

(B) The center height adjustment of the workpiece W was performed by changing the thickness of the spacer sandwiched between the blade b and the workpiece rest (not shown) supporting the blade b with reference to the previously performed grinding result. .

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

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

  In relation to this point, although not specifically illustrated, various installation configurations for reducing the size of the centerless grinding machine have been proposed as disclosed in, for example, Patent Documents 2 to 5, but the above-mentioned problems There was room for further improvements in the fundamental solution.

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 conventional problems, and the object of the present invention is to reduce space and operability by devising the arrangement of each component device around the basic configuration of the grinding machine. Is to provide a good centerless grinding machine.

  In order to achieve the above object, a centerless grinding machine of the present invention centerlessly grinds an outer peripheral surface of a workpiece with a grinding wheel that is rotationally driven while rotating and supporting the workpiece with an adjustment wheel and a blade. The dressing means for performing the dressing process comprises a single dressing device, and this dressing device is provided at a lower position between the grinding wheel and the adjustment wheel, and supplies and recovers coolant to the grinding part. The tank also has a function as a part of a local cover that covers the grinding part.

The following configuration is adopted as a preferred embodiment.
The grinding wheel and the adjustment wheel constituting the grinding part are disposed in an overhanging direction in one direction from the grinding wheel shaft case, the adjustment axle case, and the vertical slide, and are covered with the local cover, thereby contacting the machining coolant. The grinding part that is liquid is limited and isolated.

  According to the centerless grinding machine of the present invention, the outer peripheral surface of the workpiece is centerless ground by the grinding wheel that is rotationally driven while the workpiece is rotatably supported by the adjustment wheel and the blade, and the dressing process of the grinding wheel and the adjustment wheel is performed. Since the dressing means consists of a single dressing device, and this dressing device is provided at the lower position between the grinding wheel and the adjustment wheel, various unique effects 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 most influence on the width of the centerless grinder, is no longer necessary, saving space and greatly reducing the width of the centerless grinder.

  As a result, it is possible to provide a small centerless grinding machine of a desktop size that is suitable for use in a small installation space and 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 workpiece grinding position. The dimensional change due to thermal displacement during grinding of the adjusting wheel is suppressed, and the grinding accuracy can be improved.

  That is, if the dressing position of the grinding wheel and the adjustment wheel by the dressing device is different from the grinding position of the workpiece by the grinding wheel and the adjustment wheel, the working environment (especially the atmosphere) at the time of dressing of the grinding wheel and the adjustment wheel is different. Temperature) differs from the working environment during operation of the grinding wheel and the adjustment wheel, that is, during grinding. As a result, a predetermined shape dimension shaped by the dressing of the grinding wheel and the adjustment wheel is affected by a dimensional change due to thermal displacement during actual grinding, resulting in a situation where the grinding accuracy is lowered.

  On the other hand, like the present invention, since the dressing for the grinding wheel and the adjustment wheel is performed at the workpiece grinding position, the working environment during dressing becomes the same as the working environment during grinding. . As a result, the predetermined shape and shape shaped by the dressing of the grinding wheel and adjustment wheel are not affected by dimensional changes due to thermal displacement even during actual grinding, and without reducing the expected high grinding accuracy. Can be secured.

(3) The dressing device is provided on the vertical slide together with the blade supporting the workpiece at the lower position between the grinding wheel and the adjustment wheel, and the vertical slide can reciprocate in the vertical direction with respect to the bed. By adopting a configuration that can automatically control the movement of the up and down slide, it is possible to numerically control the center height adjustment of the workpiece that has been manually adjusted conventionally and the adjustment of the movement amount of the dresser diamond of the dressing device, The time required for the changeover can be shortened, and the changeability can be greatly improved.

(4) Configuration of the grinding machine A control device that controls the drive source of each part in conjunction with each other is provided inside the equipment stand so that the control board that has been provided outside the centerless grinding machine in the grinding machine space Can be equipped (in the cabin).

(5) The coolant tank for supplying and recovering coolant to the grinding part has a function as a part of a local cover that covers the grinding part, so that the coolant tank is installed in the grinding machine space. Can do.

(6) By storing the control device and the coolant tank in the grinding machine space, it is possible to promote a reduction in installation space, that is, space saving.

(7) The grinding wheel and the adjustment wheel constituting the grinding part 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 by a local cover that covers the grinding part By being coated, the grinding part in contact with the processing coolant is limited and isolated in the processing chamber.

  As a result, the grinding wheel shaft case, the adjustment axle case, the mechanism unit such as the vertical slide, and the motor drive unit are housed in the machine room separated from the processing chamber, and coolant is applied to the mechanism unit and the drive unit. This makes it difficult to improve the service life of the apparatus, and it is not necessary to provide a waterproof structure in the machine room, thereby reducing the manufacturing cost and the apparatus cost.

(8) The grinding wheel and the adjusting wheel constituting the grinding portion are disposed in an overhanging direction from the grinding wheel shaft case, the adjusting axle case and the vertical slide in the forward direction, and the dressing device is disposed between the grinding wheel and the adjusting wheel. By being provided at the lower position, all operations relating to grinding work, dressing work, etc. can be carried out almost without moving on the front side of the grinding machine, and the operability and setup are greatly improved.

1 is a front view showing an overall configuration of a centerless grinding machine that is an embodiment according to the present invention. It is a side view which shows the whole structure of the same centerless grinding machine. It is a top view which similarly shows the whole structure of the centerless grinding machine. It is a perspective view which shows the structure of the principal part of the centerless grinding machine. FIG. 5A is a front view showing an enlarged dressing device of the centerless grinding machine, FIG. 5A shows a standby state during grinding, and FIG. 5B shows a dressing state during dressing (during grinding wheel dressing). It is a top view which expands and similarly shows the dressing state of the dressing apparatus. It is a front view which shows the whole structure of the conventional centerless grinding machine.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Throughout the drawings, the same reference numeral indicates the same component or element.

  A centerless grinder according to the present invention is shown in FIGS. 1 to 6, and this grinder is a small centerless grinder having a space-saving structure for centerless grinding of 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 the grinding machine is composed mainly of the grinding wheel 1, the adjustment wheel 2, the blade 3, the dressing device 4 and the control device 5, and the configuration of these main units and the configuration of their peripheral parts save space. It has a structure for illustration.

  First, in this grinding machine, a bed 11 is placed and fixed on the apparatus base 10, and on this bed 11, a grinding wheel shaft case 16 provided with the grinding wheel 1, an adjusting axle case 26 provided with the adjusting wheel 2, and the blade 3 and the constituent units such as the dressing device 4 are provided.

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

  The grinding wheel 1 has a profile corresponding to the final shape of the workpiece W, that is, the final finished shape of the outer peripheral surface, and is detachably attached to the tip of the grinding wheel shaft 15 (cantilevered). Structure), the grindstone shaft 15 is provided on the grindstone shaft case 16 so as to be rotationally driven.

  As the basic configuration of the drive system of the grinding wheel 1, a conventionally known one can be adopted. Specifically, the grinding wheel shaft 15 is rotatably supported on the grinding wheel shaft case 16 mounted on the bed 11. The rear end portion of the grindstone shaft 15 is drivably coupled to the 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 grindstone shaft case 16 and is electrically connected to the control device 5. Yes.

  The drive motor 18 may be mounted on the rear surface side of the upright portion 16a of the grindstone shaft case 16 in accordance with the purpose in addition to the illustrated embodiment. In addition to the shape, it can be mounted in any arbitrary posture such as being provided in an upright or inverted shape depending on the purpose.

  Further, the grindstone shaft case 16 is provided on the bed 11 so as to be movable at least in the left-right cutting direction X via the grindstone slide device 20. In the illustrated embodiment, the left-right cutting direction X and the front-rear shaft center are provided. It is possible to move (forward and backward) in the direction Y.

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

  Specifically, the grindstone slide device 20 includes a grindstone left / right slide 21 and a grindstone front / rear slide 22 so that the grindstone shaft 15 can move (advance and retreat) in two straight axes in the front / rear / left / right direction. Yes.

  Although not specifically shown, the feeding operation (forward and backward movement) of the slides 21 and 22 is carried out by feeding means comprising a guide device, a feed screw unit, a drive motor as a drive source, and the like provided inside the device. It is configured to work. 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, depending on the purpose, the opposite arrangement may be employed.

  The adjustment wheel 2 supports the outer peripheral surface of the workpiece W in rotation. The rotation support surface (outer peripheral surface) has a profile corresponding to the final shape of the workpiece W, that is, the final finished shape of the outer peripheral surface, and the adjustment axle 25. The adjustment axle 25 is provided on the adjustment axle case 26 so that it can be driven to rotate.

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

  The basic structure of the drive system of the adjustment wheel 2 can be a conventionally known one. Specifically, the adjustment wheel 25 is rotatably supported by the adjustment wheel case 26 mounted on the bed 11. In addition, the rear end portion of the adjustment axle 25 is drivingly connected to the 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 in an inverted state on the rear surface side of the upright portion 26 a of the adjusting axle case 26 and is electrically connected to the control device 5. Yes.

  Note that 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 according to the purpose in addition to the illustrated embodiment, and the mounting posture is inverted as illustrated. In addition to the shape, it can be mounted in any arbitrary posture such as standing or horizontally depending on the purpose.

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

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

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

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

  Further, the grinding wheel left and right slide 21 and the adjustment wheel left and right slide 31 provided on the bed 11 are pivoted (illustrated) 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. And is provided on the bed 11 so as to be tiltable in the horizontal direction.

  The tilt adjustment structure by the pivot may be provided only on either the grindstone left / right slide 21 or the adjustment wheel left / right slide 31 depending on the purpose, or the tilt adjustment structure may be omitted. It is also possible to adopt a structure that is adjusted during assembly.

  The blade 3 supports the workpiece 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. Specifically, on the vertical slide 33 It is attached and fixed to the installed work rest 34.

  The blade 3 extends linearly between the grinding wheel 1 and the adjustment wheel 2 and has an upper end surface that is a support surface inclined downward on the adjustment wheel side.

  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 workpiece W can be automatically controlled by numerical control as will be described later.

  The dressing device 4 is a dressing means for performing a dressing process for correcting (dressing) the shape of the outer peripheral grinding wheel surface of the grinding wheel 1 and a dressing process for correcting (dressing) the shape of the outer peripheral grinding wheel surface of the adjusting wheel 2 simultaneously or independently. It functions and is provided at a lower position between the grinding wheel 1 and the adjustment 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. It is provided so as to be able to move up and down between the position, that is, the grinding wheel 1 and the axial height position Ph of the adjusting wheel 2 (FIG. 5B).

  As shown in FIG. 5A, when the dresser 35 of the dressing device 4 is at the standby position Po, the blade 3 is set at a height position 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 dressing wheel 1 and the grinding wheel 1 at the dressing position Ph are moved relative to the grinding wheel 1 and the adjustment wheel 2 in the longitudinal axis direction. The adjustment wheel 2 is dressed.

  In the illustrated embodiment, the grindstone shaft case 16 and the adjusting axle case 26 can be moved on the bed 11 in the longitudinal axis direction X and the left and right cutting direction Y via the grindstone sliding device 20 and the adjusting wheel slide device 30, respectively. Accordingly, the dresser 35 of the dressing device 4 is normally in a standby position Po located below the grinding wheel 1 and the adjusting wheel 2, and the dresser 35 is in the above-described grinding wheel 1 during dressing. Further, the adjustment wheel 2 is raised to the position of the axial center height of the adjusting wheel 2 or higher, that is, to the dressing position Ph, and is cooperated with the movement of the grinding wheel 1 and the adjusting wheel 2 in the longitudinal axis direction X. The wheel surface of the grinding wheel 1 and the rotation support of the adjustment wheel 2 while traversing in the axial direction relative to the grinding wheel 1 and the adjustment wheel 2. At the same time or separately to dressing.

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

  The vertical slide 33 is provided on the bed 11 and can be reciprocated in the vertical direction with respect to the bed 11. Thereby, 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 shown in detail, the feeding operation (elevating operation) of the upper and lower slides 33 is performed by a feeding means including a guide device, a feed screw unit, a drive motor as a drive source, and the like provided inside the device. It is configured. The drive motor is electrically connected to the control device 5.

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

  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 wheel 1 is dressed. The grinding wheel dresser 35a and the adjusting wheel dresser 35b for dressing the adjusting wheel 2 are attached to the tip of the dresser shaft 36 at a predetermined interval in the axial direction (cantilever structure). 35a and the dresser 35b for adjustment vehicles are arrange | positioned in the position which does not interfere with dressing operation | movement mutually.

  The dresser shaft case 37 attached and fixed to the front position of the vertical slide 33 has a shaft that can rotate horizontally in a state where the dresser shaft 36 is inclined in the horizontal direction with respect to the shaft center of the grinding wheel 1 and the adjustment wheel 2. In addition to being supported, it 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.

  Instead of the drive motor 39 of the illustrated embodiment, for example, a built-in motor (not shown) built in the dresser shaft case 37 is adopted to form a direct drive structure, so that the drive mechanism can be made small and simple. Thus, the space of the dresser shaft case 37 can be saved.

  The rotary dresser 35 (grinding wheel dresser 35a and adjusting wheel dresser 35b) is driven by the drive motor 39 to both the grinding wheel surface of the grinding wheel 1 and the rotation support surface of the adjusting wheel 2. It is structured to perform dressing simultaneously or individually.

  Specifically, since the dresser shaft 36 is inclined as described above, the single dressing device 4 can include the grinding wheel dresser 35a and the adjusting wheel dresser 35b, in other words, in FIG. As in the conventional apparatus shown, the grinding wheel 1 and the adjustment wheel 2 can be provided with the same function as the dedicated rotary dresser, so that the grinding wheel 1 and the adjustment wheel 2 can be combined with the two rotary dressers 35a and 35b. It is possible to dress at the same time or to dress individually.

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

  That is, in the conventional general centerless grinding machine, the coolant tank is individually provided outside the machine of the grinding machine. In the present embodiment, the coolant tank 40 is the grinding part, that is, the processing. By being configured to also have a function as a part of the local cover 50 covering the chamber, it is possible to arrange in the machine of the centerless grinding machine, and space saving of the apparatus is achieved.

  In addition to the above-described configuration, the grinding wheel 1 and the adjustment wheel 2 are arranged in one direction from the wheel shaft case 16, the adjustment wheel case 26, and the vertical slide 33 (in the illustrated embodiment, FIG. 2, FIG. 3 and FIG. As shown in FIG.

  The grinding portions arranged in an overhang shape are separated by a mechanism portion such as the grinding wheel shaft case 16, the adjusting axle case 26, and the vertical slide 33, a motor driving portion, and the partition wall 60, and the grinding portion. Is covered with the local cover 50 and stored in the processing chamber A, and the mechanism part and the driving part are covered with the entire cover 61 and stored in the machine chamber B, so that the liquid contacts the processing coolant. The grinding part is limited and isolated from the mechanism part and the driving part (separation of the processing chamber A and the machine room B).

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

  That is, in a conventional general centerless grinding machine, a control panel or an operation panel provided with a control device is provided independently outside the grinding machine, and at least an auxiliary operation panel connected to the operation panel is provided in the machine. However, in the present embodiment, it is housed in the control panel 55 provided in the apparatus base 10 and performs all control by the control panel 55. Since the sub-operation panel and related devices can be omitted, the space of the apparatus can be saved and the manufacturing cost can be reduced.

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

  The control device 5 adjusts the control program for executing the grinding step, the control program for executing the dressing step, the control program for adjusting the center height of the workpiece W, and the movement amount of the dresser diamond of the dressing device 4 A control program or the like is selectively input and set as numerical control data in advance or with a keyboard of the control panel 35 of the apparatus base 10.

  Therefore, the centerless grinding machine configured as described above exhibits various unique effects as listed below.

(A) The dressing means for performing the dressing process of the grinding wheel 1 and the adjustment wheel 2 comprises a single dressing device 4, and this dressing device 4 is provided at a lower position between the grinding wheel 1 and the adjustment wheel 2. This eliminates the need for the right and left grinding wheel dresser spaces, which had the greatest effect on the width of the conventional centerless grinder, thus saving space and greatly reducing the width of the centerless grinder.

  As a result, it is possible to provide a small centerless grinding machine of a desktop size that is suitable for use in a small installation space and 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, and dressing for 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, the dimensional change due to thermal displacement during grinding of the grinding wheel 1 and the adjustment wheel 2 can be suppressed, and the grinding accuracy can be improved.

  That is, if the dressing position of the grinding wheel 1 and the adjustment wheel 2 by the dressing device 4 is different from the grinding position of the workpiece W by the grinding wheel 1 and the adjustment wheel 2, the grinding wheel 1 and the adjustment wheel 2 The working environment at the time of dressing (particularly the ambient temperature) is different from the working environment at the time of operation of the grinding wheel 1 and the adjustment wheel 2, that is, the grinding. As a result, the predetermined shape dimension shaped by the dressing of the grinding wheel 1 and the adjustment wheel 2 is affected by a dimensional change due to thermal displacement during actual grinding, resulting in a decrease in grinding accuracy. End up.

  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 of the workpiece W (= dressing position Ph), the working environment at the time of dressing is ground. It becomes the same as the working environment of time. As a result, a predetermined shape dimension shaped by dressing of the grinding wheel 1 and the adjustment wheel 2 is not affected by a dimensional change due to thermal displacement even during actual grinding, and lowers the expected high grinding accuracy. 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 workpiece W at the lower position between the grinding wheel 1 and the adjusting wheel 2, and the vertical slide 33 is located on the bed 11. Thus, by making it possible to reciprocate in the vertical direction, it is possible to automatically control the operation of the vertical slide 33, so that the center height adjustment of the workpiece W which has been manually adjusted in the past and the dresser of the dressing device 4 can be performed. Adjustment of the movement amount of the diamond can be numerically controlled, and the time required for the changeover can be shortened, and the changeability can be greatly improved.

(D) Configuration of the grinding machine The control device 5 that controls the drive source of each part in conjunction with each other is provided inside the device stand 10 to grind the control panel 55 that has conventionally been provided outside the centerless grinding machine. It can be equipped in the board space.

(E) The coolant tank 40 for supplying and recovering 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 placed in the grinding machine space. Can be equipped.

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

(G) The grinding wheel 1 and the adjustment wheel 2 are disposed in an overhang shape in one direction (forward direction) from the grinding wheel shaft case 16, the adjustment wheel case 26 and the vertical slide 33, and a local cover 50 that covers the grinding portion. As a result of the coating, the grinding part in contact with the machining coolant is limited and isolated in the machining chamber A.

  As a result, the mechanical parts such as the grindstone shaft case 16, the adjustment axle case 26, the vertical slide 33, and the driving parts of the motors are accommodated in the machine room B separated from the processing chamber A, and these mechanical parts and driving parts are accommodated. It is difficult for the coolant to be applied to the parts, the life of the apparatus is improved, and it is not necessary to provide the machine room B with a waterproof structure, so that the manufacturing cost and thus the apparatus cost can be reduced.

(H) The grinding wheel 1 and the adjustment wheel 2 are disposed in an overhanging direction from the grinding wheel shaft case 16, the adjustment wheel case 26 and the vertical slide 33 in the forward direction, and the dressing device 4 includes the grinding wheel 1 and the adjustment wheel 2. Since it is provided at the lower position between the two, all operations related to grinding work and dressing work can be performed almost without moving on the front side of the grinding machine, and operability and setup are greatly improved. To do.

  The above-described embodiment is merely a preferred embodiment of the present invention, and the present invention is not limited thereto, 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 attached to the tips of the grinding wheel shaft 15 and the adjustment axle 25 is employed. The grinding wheel 1 and the adjustment wheel 2 may be attached to the central portion in the axial direction (both-end support structure).

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

(3) In the illustrated embodiment, the grinding wheel shaft case 16 and the adjustment axle case 26 are moved back and forth to perform dressing, but the dresser 35 may be provided with a front and rear moving mechanism for dressing. . In this case, the grindstone front / rear slide 22 of the grindstone slide device 20 and the adjustment wheel front / rear slide 32 of the adjustment wheel slide device 30 can be omitted, and the moving shaft can be reduced by one.

(4) In the illustrated embodiment, a grinding wheel dresser 35 a for dressing the grinding wheel 1 and an adjusting wheel dresser 35 b for dressing the adjusting wheel 2 are attached at a predetermined interval in the axial direction at the tip of the dresser shaft 36. However, a double-sided structure in which the pair of dressers 35a and 35b is attached to the central portion of the dresser shaft 36 in the axial direction can also be employed.

(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 illustrated, the point diamond dresser is mounted and fixed at positions corresponding to the cylindrical outer peripheral surfaces of the grinding wheel 1 and the adjustment wheel 2 on both the left and right sides of the dresser shaft case 37.

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

(7) The centerless grinding machine of the illustrated embodiment can be applied to any type of centerless grinding machine regardless of the grinding system, such as the through-feed grinding system or the in-feed grinding system.

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

W Work (Workpiece)
A Processing chamber B Machine room X Left and right cutting direction Y Front and rear axis direction Po Standby position Ph Dressing position 1 Grinding wheel 2 Adjustment wheel 3 Blade 4 Dressing device 5 Controller 10 Device base 11 Bed 15 Grinding wheel shaft 16 Grinding wheel shaft case 20 Grinding wheel slide Device 21 Grinding wheel left / right slide 22 Grinding wheel front / rear slide 25 Adjustment axle 26 Adjustment axle case 30 Adjustment wheel slide device 31 Adjustment wheel left / right slide 32 Adjustment wheel front / rear slide 33 Up / down slide 34 Workrest 35 Rotary dresser (dresser)
35a Grinding wheel dresser 35b Adjustment car dresser 36 Dresser shaft 37 Dresser shaft case 40 Coolant tank 50 Local cover 55 Control panel 60 Bulkhead 61 Whole cover

Claims (2)

A centerless grinding machine that centerlessly grinds the outer peripheral surface of a workpiece with a grinding wheel that rotates while supporting the workpiece with an adjustment 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 this dressing device is provided at a lower position between the grinding wheel and the adjusting wheel,
A centerless grinding machine, wherein a coolant tank for supplying and recovering coolant to and from a grinding part has a function as a part of a local cover that covers the grinding part. The grinding wheel and the adjustment wheel constituting the grinding portion are disposed in an overhang shape in one direction from the grinding wheel shaft case, the adjustment axle case, and the vertical slide, and are covered with the local cover so as to contact the processing coolant. The centerless grinding machine according to claim 1, wherein the grinding portion to be liquid is limited and isolated.

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