JP2018176298A - Grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding machine utilizing a tailstock whose structure can be simplified.SOLUTION: A tailstock 30 comprises: a first body 110 which is mounted with a center 100; and a second body 120 which can move in a rotation axis-line direction of a workpiece W with respect to the first body 110, can move in the rotation axis-line direction of the workpiece W with respect to a head 10, and is driven by a tailstock driving device 73, so that the second body 120 pressurizes the first body 110 in a direction in which the body is made approach the workpiece W. The first body 110 comprises: a first body base 111 to which a first slider 32a is fixed; and a first body extending part 112 which is positioned away from the rotation axis-line direction of the workpiece W with respect to the first slider 32a, and which extends upward from an end surface in a rotation axis-line direction of the workpiece W, of the first body base 111, and supports a center 100, at a position upper than an upper surface of the first body base 111.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a grinding machine.

  Patent Document 1 discloses a work supporting device provided with a tailstock which is slidably fitted to a tailstock main body and has a ram having a center at one end and a driving device for driving the ram back and forth. There is. The tailstock described in Patent Document 1 performs support and release of the work with the headstock by driving a drive unit (hydraulic pressure) to move the ram back and forth relative to the tailstock main body.

Patent No. 3218685

  By having the ram and the drive device described above in Patent Document 1, the number of parts increases, and the structure of the tailstock becomes complicated.

  An object of the present invention is to provide a grinder using a tailstock which can simplify the structure.

  The grinding machine according to the present invention comprises a bed, a headstock provided on the bed, a tailstock rotatably supporting a workpiece between the headstock and a rotation axis of the workpiece relative to the bed. A grinding wheel provided so as to be movable in a direction intersecting the direction; a grinding wheel rotatably supported with respect to the grinding wheel and performing grinding on the workpiece; and provided on the bed, relative to the bed And a tailstock driving device for moving a tailstock.

  The tailstock is movable relative to a center supporting the end face of the workpiece, a first body to which the center is attached, and the first body with respect to the first body, the bed being the bed A second body which is movable in the direction of the rotation axis of the workpiece and driven by the tailstock driving device to press the first body toward the workpiece; and Is disposed between the surface of the first main body and the surface of the second main body facing in the direction of the rotation axis, and urging the first main body toward the workpiece based on the position of the second main body And a first slider fixed to the first body and guided by the bed and movable in the rotational axis direction of the workpiece.

  The first main body is a first main body base which is a portion to which the first slider is fixed, and a position deviated from the rotational axis direction of the workpiece with respect to the first slider. And a first main body extension portion extending upward from an end face in the rotational axis direction of the workpiece and supporting the center above the upper surface of the first main body base.

  According to the grinding machine of the present invention, the center is supported by the first main body extension at a position deviated from the first slider in the rotational axis direction of the workpiece, so that the tailstock is in the radial direction of the workpiece Even in the case of a wide width, stable and accurate support can be achieved. As a result, since the grinding machine can increase the degree of freedom of the workpiece that can be supported between the spindle stock and the tailstock, it can improve versatility. Also, in the grinding machine, since the first body is supported by the first slider, the support rigidity of the center can be enhanced, and the workpiece can be stably supported.

  Then, the tailstock can press the center against the workpiece by pressing the first main body toward the workpiece with the second main body. As a result, since the tailstock can dispense with the ram and the drive device for driving the ram provided in the conventional tailstock, the structure of the tailstock can be simplified.

  Furthermore, the first body extension supports the center above the top surface of the first body base. That is, since the height from the bed of the first main body base is set to be lower than the height from the bed of the center, weight reduction of the first main body can be achieved.

It is a top view of the grinder in one embodiment of the present invention. It is an enlarged view of a bracket and a tour seen from one side in the Z direction. It is an enlarged front view of a tailstock, and the cross section in the III-III line shown in Drawing 1 is illustrated about the 1st main part and the 2nd main part. It is an enlarged front view of a tailstock, and the cross section in the IV-IV line shown in FIG. 1 is illustrated about the 1st main body and the 2nd main body. It is the figure which expanded the part by which the 2nd main body and the spring member are illustrated among FIG. It is the figure which moved the tailstock main body to Z direction one side from the state shown in FIG. It is the figure which moved the tailstock main body further to the Z direction one side from the state shown in FIG. 6, Comprising: The state which a center supports the end surface of a workpiece is shown.

  Hereinafter, an embodiment to which a grinding machine according to the present invention is applied will be described with reference to the drawings. Hereinafter, the rotation axis direction of the workpiece W is referred to as Z direction, and the horizontal direction orthogonal to the rotation axis direction of the workpiece W is referred to as X direction.

(1. Schematic Configuration of Grinding Machine 1)
As shown in FIG. 1, the grinding machine 1 is a grinding wheel traverse type grinding machine that performs grinding while rotating a crankshaft as a workpiece W. The grinding machine 1 includes a bed 10, a headstock 20, a tailstock 30, a first traverse base 41 and a second traverse base 42, a first grinding wheel 51 and a second grinding wheel 52, and a first grinding wheel 61 and the second grinding wheel 62 are mainly provided.

  The bed 10 is a portion to be a base of the grinding machine 1. The bed 10 includes a table 11 provided between the headstock 20 and the tailstock 30. The table 11 is fixed to the upper surface of the bed 10. On the upper surface of the table 11, for example, a temporary support (not shown) for temporarily supporting the workpiece W carried between the headstock 20 and the tailstock 30 by a loader (not shown) or the like, or A phasing device (not shown) for phasing around the central axis of the workpiece W is arranged.

  Then, on the upper surface of the bed 10, a pair of headstock guide rails 12 for guiding the headstock 20 in the Z direction is provided on one side in the Z direction (right side in FIG. 1) as viewed from the table 11. Further, on the upper surface of the bed 10, a pair of tailstock guide rails 13 for guiding the tailstock 30 in the Z direction is provided on the other side in the Z direction (left side in FIG. 1) viewed from the table 11. Furthermore, on the upper surface of the bed 10, a pair of traverse base guide rails 14 for guiding the first traverse base 41 and the second traverse base 42 in the Z direction on one side in the X direction (the upper side in FIG. 1) Provided.

  The grinding machine 1 further includes a headstock driving device 72, a tailstock driving device 73, and two traverse base driving devices 74a and 74b. The headstock driving device 72, the tailstock driving device 73, and the traverse base driving devices 74a and 74b are screw feed mechanisms provided on the upper surface of the bed 10. The headstock driving device 72 applies a driving force for moving the headstock 20 in the Z direction with respect to the bed 10. The tailstock driving device 73 applies a driving force for moving the tailstock 30 in the Z direction with respect to the bed 10. One traverse base drive device 74 a applies a driving force for moving the first traverse base 41 in the Z direction with respect to the bed 10. The other traverse base drive 74 b applies a driving force for moving the second traverse base 42 in the Z direction with respect to the bed 10.

  The headstock 20 is provided on the upper surface of the bed 10. The headstock main body 21, the main spindle 22, and the main spindle motor 23 are mainly provided. The headstock main body 21 is provided movably in the Z direction with respect to the bed 10 by being guided by the pair of headstock guide rails 12, and is moved in the Z direction by being driven by the headstock driving device 72. Do. The main shaft 22 is rotatably attached to the main spindle body 21 around an axis parallel to the Z direction. The spindle motor 23 applies a driving force for rotating the spindle 22. The headstock 20 rotates the workpiece W around the rotation axis by driving the spindle motor 23 in a state in which the end face on one side (left side in FIG. 1) of the workpiece W in the rotation axis direction is supported by the spindle 22.

  The tailstock 30 is provided on the upper surface of the bed 10. The tailstock 30 is disposed to face the headstock 20 in the Z direction, and rotatably supports the workpiece W with the headstock 20. The details of the tailstock 30 will be described later.

  The first traverse base 41 is provided on the upper surface of the bed 10. The first traverse base 41 is a member serving as a base of the first grinding wheel head 51. The first traverse base 41 is provided so as to be movable in the Z direction with respect to the bed 10 by being guided by the pair of traverse base guide rails 14, and is driven by one of the traverse base driving devices 74a. Move in the direction. Further, on the upper surface of the first traverse base 41, a first grindstone table guide rail 41a for guiding the first grindstone table 51 in the X direction is provided. And the 1st traverse base 41 is provided with the 1st whetstone driving device 41b. The first grindstone table driving device 41 b applies a driving force for moving the first grindstone table 51 in the X direction with respect to the bed 10.

  The second traverse base 42 is provided on the upper surface of the bed 10. The second traverse base 42 is a member that is a base of the second grinding wheel 52. The second traverse base 42 is provided movably in the Z direction with respect to the bed 10 by being guided by the pair of traverse base guide rails 14, and is driven by the other traverse base driving device 74b, Move in the direction. Further, on the upper surface of the second traverse base 42, a pair of second wheel head guide rails 42a for guiding the second wheel head 52 in the X direction is provided. And the 2nd traverse base 42 is provided with the 2nd grinding wheel stand drive 42b. The second wheel head driving device 42 b applies a driving force for moving the second wheel head 52 in the X direction with respect to the bed 10.

  The first grinding wheel head 51 is provided on the upper surface of the first traverse base 41. The first grindstone table 51 is provided to be movable in the X direction with respect to the bed 10 and the first traverse base 41 by being guided by the pair of first grindstone table guide rails 41a, and the first grindstone table driving device 41b And move in the X direction. The second grinding wheel 52 is provided on the upper surface of the second traverse base 42. The second wheel head 52 is provided movably in the X direction with respect to the bed 10 and the second traverse base 42 by being guided by the pair of second wheel head guide rails 42a, and the second wheel head driving device 42b And move in the X direction.

  The first grinding wheel 61 is rotatably supported on an axis parallel to the Z direction with respect to the first grinding wheel 51. The first grinding wheel 61 is rotated by receiving a driving force from the first grinding wheel motor 63 fixed to the first grinding wheel 51, and grinds the outer peripheral surface of the crank pin of the crankshaft which is the workpiece W . The second grinding wheel 62 is rotatably supported by the second grinding wheel 52 about an axis parallel to the Z direction. The second grinding wheel 62 is rotated by applying a driving force from the second grinding wheel motor 64 fixed to the second grinding wheel 52, and grinds the outer peripheral surface of the crank pin of the crankshaft which is the workpiece W .

  As shown in FIG. 2, the grinding machine 1 further includes a bracket 80 and a wheel 90. The bracket 80 is a gate-shaped member provided so as to bridge over the tailstock 30 in the X direction, and is fixed to the upper surface of the bed 10. In FIG. 2, the outer shape of the tailstock 30 is schematically illustrated by a two-dot chain line. The puller 90 is a device for truing the first grinding wheel 61 and the second grinding wheel 62, and is installed on the bracket 80.

  Thus, the thru 90 is fixed to the bed 10 via the bracket 80. Thus, the grinding machine 1 can hold the crane 90 in a stable state as compared with the case where the crane 90 is installed on the tailstock 30 provided movably with respect to the bed 10. Furthermore, the position of the rotation center of the wheel 90 in the X direction is disposed on the support 81 of the bracket 80 extending upward from the bed 10. Thus, the grinding machine 1 can hold the pulley 90 in a stable state. As a result, the grinding machine 1 can improve the truing accuracy by the wheel 90.

(2. Schematic configuration of the tailstock 30)
Next, the tailstock 30 will be specifically described. First, the schematic configuration of the tailstock 30 will be described with reference to FIG. As shown in FIG. 3, the tailstock 30 includes a tailstock body 31, three pairs of sliders 32, a cover 33, and a cover protector 34.

  Although the details will be described later, the tailstock main body 31 is formed separately from a first main body 110 supporting the center 100 and a second main body 120 driven by a tailstock driving device 73 (see FIG. 1). Ru. The slider 32 is a member which is guided by the pair of tailstock guide rails 13 and slides in the Z direction. The three pairs of sliders 32 include two pairs of first sliders 32 a fixed to the first body 110 and a pair of second sliders 32 b fixed to the second body 120. The three pairs of sliders 32 are juxtaposed in the Z direction, and the pair of second sliders 32b is disposed between the two pairs of first sliders 32a.

  The cover 33 is a member that covers a portion of the tailstock guide rail 13 that is located on one side (right side in FIG. 3) of the tailstock main body 31 in the Z direction, and is provided expandable in the Z direction. One end side (the left side in FIG. 3) of the cover 33 in the Z direction is fixed to the bed 10, and the other end side (the right side in FIG. 3) in the Z direction of the cover 33 is fixed to the tailstock main body 31. Thus, the cover 33 expands and contracts in the Z direction as the tailstock body 31 moves in the Z direction with respect to the bed 10.

  The cover protection portion 34 is a member that covers one side in the Z direction of the cover 33, and is formed in a box shape that can accommodate the contracted cover 33. The cover protection unit 34 protects the cover 33 by preventing a spark generated during grinding from falling on the cover 33.

(3. About the tailstock 31)
Subsequently, the tailstock 31 will be described in detail. In FIGS. 4 to 7, the slider 32 is omitted in order to simplify the drawings for easy understanding.

  As shown in FIG. 3, the tailstock main body 31 mainly includes a center 100, a first main body 110, a second main body 120, and a spring member 130 (see FIG. 4). The center 100 supports the end face of the other end of the workpiece W in the rotational axis direction, and the tip of the center 100 supporting the end face of the workpiece W is the tip of the main shaft 22 (see FIG. 1) of the headstock 20 Directed to

  The first body 110 supports the center 100 as described above. The first main body 110 is a first main body base 111, which is a portion to which the first slider 32a is fixed, and a first main body extension portion deviated from the first slider 32a in the rotational axis direction of the workpiece W. And 112.

  As shown in FIGS. 4 and 5, the first main body base 111 includes a lower base portion 111a and an upper base portion 111b. The base lower portion 111a is set to have a width in the X direction larger than a distance between the pair of tailstock guide rails 13 in the X direction (see FIG. 1). The base upper portion 111b is a portion extending upward from the base lower portion 111a. The upper base portion 111b has a smaller width in the X direction than the lower base portion 111a, and is formed at a position deviated to one side in the X direction (upper side in FIG. 1 and back in FIG. 4) than the center in the X direction of the lower base portion 111a. Ru.

  Further, on the lower surface of the lower base portion 111a, a second main body base accommodation concave portion 113 in which a second main body base 121 described later of the second main body 120 is accommodated is formed in the first main body base 111. Then, two pairs of first sliders 32a (see FIG. 3) are fixed to the lower surface of the base lower portion 111a on both sides in the Z direction across the second main body base accommodation recess 113. The second main body base accommodation recess 113 is substantially L-shaped when viewed from the X direction (see FIG. 4), and the second main body base accommodation recess 113 is the upper surface on the other side in the Z direction (left side in FIG. 4) In addition, it includes a communication recess 114 which is recessed upward more than one side in the Z direction (right side in FIG. 4).

  Furthermore, a spring member accommodating portion 115 in which the spring member 130 is accommodated is formed in the first main body base 111. The spring member accommodating portion 115 communicates with the communication recess 114 of the second main body base receiving recess 113 in the Z direction.

  The first main body extension portion 112 extends upward (upper side in FIG. 4) from an end surface of the base upper portion 111b of the first main body base 111 that faces one side in the Z direction (right side in FIG. 4). Thus, the center 100 is supported by the first main body 110 at a position closer to the headstock 20 than the first slider 32a (see FIG. 3). Further, below the portion of the first main body extension portion 112 that supports the center 100, the end surface of the first main body extension portion 112 facing the table 11 is directed to the first main body base 111 side (left side in FIG. 4). A notch 116 is formed. Thereby, since the tailstock 30 can move the center 100 to the upper side (upper side in FIG. 4) of the table 11, the width in the radial direction (X direction) of the workpiece W is wide, and the support position of the workpiece W Even if the table 10 is located above the table 10 (the upper side in FIG. 4), the workpiece W can be stably and accurately supported.

  Furthermore, the notch 116 is notched in a shape that conforms to the outer shape of the cover protection portion 34 at a portion facing the cover protection portion 34. Thereby, since the tailstock 30 can avoid interference with parts arranged below the workpiece W, such as the cover protection unit 34, the center 100 can be brought closer to the headstock 20.

  In addition, the first main body extension portion 112 supports the center 100 above the upper surface of the first main body base 111. That is, since the height from the bed 10 of the first main body base 111 is set to be lower than the height from the bed 10 of the center 100, the tailstock 30 can reduce the weight of the first main body 110. it can. Then, the bracket 80 is installed to bridge the upper side of the first main body base 111. Thereby, the grinding machine 1 can arrange | position the puller 90 (refer FIG. 2) in the height position equivalent to the center 100. As shown in FIG.

  The upper surface of the first main body extension portion 112 is an inclined surface which rises as it goes from the first main body base 111 side to the center 100 side. As a result, the first main body extension portion 112 can ensure the thickness dimension in the Z direction at a portion located above the upper surface of the first main body base 111. As a result, since the grinding machine 1 can strongly press the center 100 against the workpiece W, the workpiece W can be reliably supported.

  3 and 4 show the tailstock main body 31 in the position farthest from the headstock 20. FIG. In the state shown in FIGS. 3 and 4, the bracket 80 is installed on the other side in the Z direction (the left side in FIGS. 3 and 4) than the first main body extension portion 112. Can be prevented from interfering with the bracket 80.

  The second main body 120 is a portion movable in the Z direction with respect to the first main body 110. The second body 120 includes a second body base 121, a feed nut 122, a second body extension 123, a second body shaft 124, and a bearing 125.

  The second main body base 121 is accommodated in a second main body base accommodation recess 113 formed in the first main body base 111 of the first main body 110, and a pair of second sliders 32 b (see FIG. 3) is fixed. That is, the second main body 120 is provided to be movable in the Z direction with respect to the bed 10. Further, the second main body base 121 is provided to be movable in the Z direction with respect to the first main body base 111 in a state of being accommodated in the second main body base accommodation recess 113.

  The feed nut 122 is a nut screwed to a screw shaft 73 a provided in the tailstock driving device 73, and is fixed to the lower portion of the second main body base 121. Thus, the second main body 120 is driven by the tailstock driving device 73 and moves in the Z direction along the pair of tailstock guide rails 13.

  The second main body extension portion 123 is a portion extending upward from the other side (the left side in FIG. 4) of the second main body base 121 in the Z direction, and a portion of the second main body extension portion 123 is a second main body base It is accommodated in the communication recess 114 of the accommodation recess 113. The second main body shaft portion 124 is a shaft-shaped member extending in the Z direction, and is fixed to the second main body extension portion 123. The axial direction one side (right side in FIG. 4) of the second main body shaft portion 124 protrudes from the surface of the second main body extension portion 123 facing the spring member accommodation portion 115, and the protruding portion is inserted into the spring member accommodation portion 115 Be done. The bearing 125 is externally fitted to a portion of the second main body shaft portion 124 that protrudes from the second main body extension portion 123.

  The spring member 130 is a spring accommodated in the spring member accommodation portion 115 and includes a first spring 131 and a second spring 132. The first spring 131 has a smaller diameter than the second spring 132 and has a larger length in the expansion and contraction direction than the second spring 132. Further, the second main body shaft portion 124 accommodated in the spring member accommodation portion 115 is inserted into the first spring 131 and the second spring 132.

  Here, in the spring member accommodating portion 115, the inner diameter on one side in the Z direction is set to a size smaller than the inner diameter on the other side in the Z direction. The inner diameter on one side in the Z direction of the spring member accommodation portion 115 is set to be larger than the outer diameter of the first spring 131 and smaller than the outer diameter of the second spring 132. Thereby, one end side (the right side in FIG. 5) of the first spring 131 can contact the end face of the spring member accommodation portion 115, while the one end side of the second spring 132 has an inner diameter of the spring member accommodation portion 115 It is possible to contact the step formed at the changing site. On the other hand, the other end sides (the left side in FIG. 5) of the first spring 131 and the second spring 132 can contact the end face of the bearing 125 externally fitted to the second main body shaft portion 124.

  Thus, the spring member 130 is a surface of the first main body base 111 of the first main body 110 opposed in the Z direction (inner peripheral surface of the spring member accommodating portion 115) and a surface of the second main body base 121 of the second main body 120. It is disposed between (the end face of the bearing 125). Then, the spring member 130 urges the first main body 110 in a direction (right direction in FIG. 4) approaching the workpiece W with reference to the position of the second main body 120.

(4. Operation mode of the tailstock 30)
Next, the operation mode of the tailstock 30 will be described. As shown in FIG. 6, when the second main body 120 is moved to one side in the Z direction (right side in FIG. 4) by driving the tailstock driving device 73 from the state shown in FIG. It is pressed by the second main body 120 through the member 130 and moves to one side in the Z direction. In the state shown in FIG. 6, the first spring 131 is compressed between the first main body 110 and the second main body 120, while the second spring 132 is compressed to the second main body 120 (end face of the bearing 125). Not in contact and not compressed.

  As shown in FIG. 7, the second main body 120 is further moved to one side in the Z direction (right side in FIG. 6) from the state shown in FIG. The movement of one body 110 to one side in the Z direction is restricted. In this state, when the second main body 120 is further moved to one side in the Z direction, the distance between the first main body 110 and the second main body 120 is narrowed, and the spring member 130 is compressed. As a result, the first main body 110 is urged by the spring member 130 from the second main body 120 side to the workpiece W side, and the center 100 is pressed against the end face of the workpiece W. Thus, the tailstock 30 can reliably support the workpiece W with the headstock 20.

  When the distance between the first main body 110 and the second main body 120 is equal to or greater than the length of the second spring 132 in the expansion / contraction direction in a state where the center 100 contacts the end face of the workpiece W, Only the first spring 131 is compressed. On the other hand, when the distance between the first main body 110 and the second main body 120 becomes narrower than the length in the expansion and contraction direction of the second spring 132, both the first spring 131 and the second spring 132 are compressed, and the workpiece The pressing force of the center 100 against W increases.

  Thus, the tailstock 30 can adjust the pressing force of the center 100 on the workpiece W by moving the second main body 120 in the Z direction. Therefore, the grinding machine 1 can support the workpiece W reliably.

  As described above, since the tailstock 30 can dispense with the ram and the drive device for driving the ram provided in the conventional tailstock, the structure of the tailstock 30 can be simplified. Furthermore, since the tailstock 30 can strongly press the center 100 against the end face of the workpiece W by using the biasing force of the spring member 130, the workpiece W can be reliably supported.

  Further, since the center 100 and the first main body extension portion 112 at a position away from the first slider 32 a toward the workpiece W in the rotational axis direction of the workpiece W, the tailstock 30 is a workpiece Even when the width in the radial direction (X direction) of W is wide, the entire support can be accurately performed. As a result, the grinding machine 1 has a degree of freedom of the workpiece W that can be supported between the spindle stock 20 and the tailstock 30 (for example, a degree of freedom regarding the shape of the workpiece W, the processing method for the workpiece W, etc.) Because it can be enhanced, versatility can be improved. In addition, the first main body 110 is supported by the first slider 32a. In particular, since the first main body 110 is linearly supported by the plurality of first sliders 32a, the grinding machine 1 can increase the support rigidity of the center 100 and stably support the workpiece W. it can.

  Furthermore, the tailstock 30 makes the height position of the upper surface of the first main body base 111 lower than the height position of the center 100 by eliminating the ram and hydraulic mechanism provided in the conventional tailstock. be able to. As a result, the grinding machine 1 can be installed so that the bracket 80 fixed to the bed 10 is bridged over the first main body base 111, and the wheel 90 can be arranged on the bracket 80. Thereby, since the grinding machine 1 can fix the tsurua 90 to the bed 10 via the bracket 80, compared with the case where the tulle 90 is installed in the tailstock 30, the support rigidity of the tulle 90 can be improved, and truing. Accuracy can be improved.

(5. Other)
As mentioned above, although the present invention was explained based on the above-mentioned embodiment, the present invention is not limited at all to the above-mentioned embodiment, and it is easy that various modification improvement is possible within the range which does not deviate from the meaning of the present invention It can be guessed that. Further, the numerical values listed in the above-described embodiments are merely examples, and it is naturally possible to apply other numerical values.

  For example, in the above embodiment, the case where the pressing force of the workpiece W by the center 100 is adjusted using the biasing force of the spring member 130 has been described as an example. However, the present invention is not limited to this, and instead of utilizing the biasing force of the spring member 130, fluid pressure such as torque by a motor or hydraulic pressure or air pressure may be utilized.

  Further, in the above-described embodiment, the case where the bracket 90 is provided with the puller 90 has been described as an example, but it is also possible to provide an apparatus other than the wheel 90 on the bracket 80.

(6. Effect)
As described above, the grinding machine 1 includes the bed 10, the headstock 20 provided on the bed 10, the tailstock 30 rotatably supporting the workpiece W between the headstock 20, and the bed 10. On the other hand, the grinding wheel table as the first grinding wheel 51 or the second grinding wheel 52 provided so as to be movable in the direction intersecting the rotational axis direction of the workpiece W, and the grinding wheel table is rotatably supported. The grinding wheel as the first grinding wheel 61 or the second grinding wheel 62 for grinding to the above, and a tailstock driving device 73 provided on the bed 10 and moving the tailstock 30 with respect to the bed 10.

  The tailstock 30 is movable relative to the center 100 supporting the end face of the workpiece W, the first body 110 to which the center 100 is attached, and the first body 110 in the rotational axis direction of the workpiece W, A second body 120 which is movable in the direction of the rotational axis of the workpiece W relative to the bed 10 and is driven by the tailstock driving device 73 to press the first body 110 in a direction approaching the workpiece W; And a first slider 32a fixed to the first body 110 and guided by the bed 10 and movable in the rotational axis direction of the workpiece W.

  The first main body 110 is located at a position away from the rotation axis of the workpiece W with respect to the first slider base 32a, which is a portion to which the first slider 32a is fixed, and the first slider 32a. And a first main body extension portion 112 extending upward from the end surface in the rotational axis direction of the workpiece W and supporting the center 100 above the upper surface of the first main body base 111.

  According to the grinding machine 1, the center 100 is supported by the first main body extension portion 112 at a position deviated from the first slider 32 a in the rotational axis direction of the workpiece W. Even when the width in the radial direction (X direction) of the object W is wide, it can be stably and accurately supported. As a result, since the grinding machine 1 can raise the freedom degree of the workpiece W which can be supported between the headstock 20 and the tailstock 30, the versatility can be improved. Further, in the grinding machine 1, since the first main body 110 is supported by the first slider 32 a, the support rigidity of the center 100 can be enhanced, and the workpiece W can be stably supported.

  Further, the tailstock 30 can press the center 100 against the workpiece W by pressing the first main body 110 in the direction approaching the workpiece W by the second member 120. As a result, since the tailstock 30 can dispense with the ram and the drive device for driving the ram provided in the conventional tailstock, the structure of the tailstock 30 can be simplified.

  Furthermore, the first main body extension portion 112 supports the center above the upper surface of the first main body base 111. That is, since the height from the bed 10 of the first main body base 111 is set lower than the height from the bed 10 of the center 100, the weight reduction of the first main body 110 can be achieved.

  Furthermore, the grinding machine 1 described above is provided with a portal bracket 80 fixed to the bed 10 and provided to bridge over the first main body base 111. According to the grinding machine 1, another device can be disposed above the first main body base 111.

  Furthermore, the grinding machine 1 described above includes a wheel 90 for truing the grinding wheel as the first grinding wheel 61 and the second grinding wheel 62, and the wheel 90 is attached to the bracket 80. According to this grinding machine 1, since the truer 90 is attached to the bed 10 through the bracket 80, the support rigidity of the truer 90 can be enhanced as compared with the case where the truer 90 is attached to the tailstock 30, and the truing accuracy Can be improved.

  In the grinding machine 1 described above, the bed 10 is provided with the table 11 provided between the spindle stock 20 and the tailstock 30 and below the portion of the first main body extension portion 112 that supports the center 100, A notch 116 is formed by cutting away from the end face facing the table 11 toward the first main body base 111 side. According to the grinding machine 1, the tailstock 30 can bring the center 100 closer to the headstock 20. As a result, since the grinding machine 1 can raise the freedom degree of the workpiece W which can be supported between the headstock 20 and the tailstock 30, the versatility can be improved.

1: Grinding machine, 10: Bed, 11: Table, 20: Headstock, 30: Tailstock, 32a: First slider, 51: First wheel head (stone head), 52: Second wheel head (stone head) ), 61: first grinding wheel (grind wheel), 62: second grinding wheel (grind wheel), 73: tailstock drive, 80: bracket, 90: tsurua, 100: center, 110: first body, 111: first main body base, 112: first main body extension, 116: notch, 120: second main body, 130: spring member, W: workpiece

Claims (4)

With a bed,
A headstock provided in the bed,
A tailstock which rotatably supports a workpiece between the headstock and the headstock;
A grinding head provided so as to be movable relative to the bed in a direction intersecting the rotational axis direction of the workpiece;
A grinding wheel rotatably supported with respect to the grinding wheel head for grinding the workpiece;
A tailstock drive provided on the bed and moving the tailstock relative to the bed;
A grinding machine equipped with
The said stern stand is
A center for supporting the end face of the workpiece;
A first body to which the center is attached;
It is movable relative to the first body in the rotational axis direction of the workpiece, movable in the rotational axis direction of the workpiece relative to the bed, and driven by the tailstock driving device. A second main body pressing the first main body in a direction approaching the workpiece;
A first slider fixed to the first body and guided by the bed and movable in the rotational axis direction of the workpiece;
Equipped with
The first body is
A first main body base which is a portion to which the first slider is fixed;
An upper surface of the first main body base extends from an end surface of the first main body base in the rotational axial direction of the first main body base at a position deviated from the rotational axial direction of the work relative to the first slider. A first main body extension for supporting the center above the upper body;
Grinder with. The grinder is
The grinding machine according to claim 1, comprising a portal bracket fixed to the bed and provided to bridge over the first main body base. The grinding machine includes a wheel that performs truing on the grinding wheel,
The grinding machine according to claim 2, wherein the tsurua is attached to the bracket. The bed comprises a table provided between the headstock and the tailstock;
The first main body extension portion is formed with a cutout portion, which is cut out toward the first main body base from an end face facing the table, under a portion supporting the center in the first main body extension portion. The grinding machine as described in any one of -3.

Images