JP2010042489A - Workpiece receiver and cylindrical grinding machine including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece receiver receiving a workpiece to provide high circularity by grinding the workpiece with high accuracy. <P>SOLUTION: This workpiece receiver 5 is provided in a cylindrical grinding machine including a workpiece support mechanism for horizontally supporting the cylindrical workpiece W by support parts provided with a space and a grinding wheel 46 abutting on an outer peripheral surface of the workpiece W. The workpiece receiver 5 is arranged between the support parts of the workpiece support mechanism to rotatably support the workpiece W. The workpiece receiver 5 includes a first receiving member 11 for receiving an outer peripheral surface on a lower side of the workpiece W and a second receiving member 12 for receiving an outer peripheral surface on an opposite side of an abutting side of the grinding wheel 46. The first receiving member 11 is arranged so that an angle α of a normal line of a receiving surface 11a may be 15° to 30° from a vertical surface including an axis of the workpiece W to the grinding wheel 46 side. The second receiving member 12 is arranged so that an angle γ of a normal line of a receiving surface 12a may be 5° to 20° from a horizontal surface including the axis of the workpiece W to a lower side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is arranged between support parts of a cylindrical grinder for grinding a work supported at two axially spaced positions by two support parts of a work support means with a grinding wheel to support the work rotatably. The present invention relates to a workpiece receiver and a cylindrical grinding machine provided with the workpiece receiver.

  Conventionally, as a grinding machine, for example, one disclosed in Japanese Patent Application Laid-Open No. 61-65723 is known. This grinding machine includes a bed, a headstock for supporting one end side of a horizontally disposed work, a tailstock for supporting the other end side of the work, provided at a distance from the headstock. The work rotation drive mechanism that rotates the work supported by the headstock and tailstock around its axis, and the headstock and tailstock are provided on the upper surface, and are provided on the bed so as to be movable in the axial direction of the work A table that is disposed between the headstock and the tailstock on the upper surface of the table, and a work receiver that contacts the outer peripheral surface of the work and rotatably supports the work, and a table feed mechanism that moves the table. A grinding wheel that is in contact with the outer peripheral surface of the workpiece, a grinding wheel base that is provided on the bed so as to be movable in a horizontal direction perpendicular to the axis of the workpiece, and that rotatably supports the grinding wheel about its axis. Rotate around the axis Comprising a grinding wheel rotation drive mechanism, and the wheel head feed mechanism for moving the wheel head.

  The workpiece receiver is used to prevent bending of the workpiece due to its own weight or grinding force of a grinding wheel when grinding a long workpiece. As a specific structure thereof, for example, FIG. 4, a first receiving member 101 provided on the lower side of the workpiece W and having a horizontal receiving surface 101a for receiving the outer peripheral surface of the workpiece W, and a contact side of the workpiece W with the grinding wheel 105, Is provided on the opposite side, and includes a second receiving member 102 having a vertical receiving surface 102a for receiving the outer peripheral surface of the workpiece W, a support member 103 for supporting the receiving members 101, 102, and the like. One supporting structure including the first receiving member 101, the second receiving member 102, and the supporting member 103 is provided between the headstock and the tailstock, or along the workpiece axis direction between the mainstock and the tailstock. Multiple at regular intervals That.

  In the grinding machine configured as described above, the grinding wheel base is moved by the grinding wheel base feed mechanism so that the grinding wheel has a predetermined cutting amount with respect to the work supported by the headstock, the tailstock and the work support 100, After the positioning, the table is moved in the axial direction of the workpiece by the table feeding mechanism, and thereby the workpiece and the grinding wheel rotated by the workpiece rotation driving mechanism and the grinding wheel rotation driving mechanism are relatively moved to move the workpiece. The outer periphery is ground.

JP-A-61-65723

  By the way, as a result of repeated research, the inventors of the present application have supported the workpiece W by three points of the grinding wheel 111, the support blade 112, and the adjustment wheel 113 as shown in FIG. Similar to the centerless grinding machine 110, there is a portion where the workpiece W is restrained at three points of the grinding wheel 105, the first receiving member 101, and the second receiving member 102. These restraining forces, the headstock and the tailstock It was presumed that the workpiece W is subjected to the same circular action as the centerless grinding machine 110 due to the complicated combination of the restraining force due to. The same applies not only to the portion restrained by the workpiece receiver 100 but also to the unconstrained portion.

  In the centerless grinding machine 110, generally, an angle formed by a straight line connecting the center of the grinding wheel 111 and the center of the adjustment wheel 113 and a straight line connecting the center of the grinding wheel 111 and the center of the workpiece W is defined as a. The angle between the straight line connecting the center of the grinding wheel 111 and the center of the adjustment wheel 113 and the straight line connecting the center of the adjustment wheel 113 and the center of the workpiece W is b, and the center of the grinding wheel 111 and the adjustment wheel 113 If the distance H between the straight line connecting the center and the center of the workpiece W is the center height and a + b = c is the center height angle, an optimal circular action is obtained when the center height angle c is about 7 °. It is supposed to be. This is because if the heart angle c is smaller than 7 ° (the heart height H is smaller than a certain value), an odd-numbered equi-diameter strain circle is likely to occur, and the heart height angle c is larger than 7 ° (the heart height H is smaller). This is because even-numbered different-diameter strain circles are likely to occur and the roundness is reduced in any case.

  Then, in the above-described workpiece receiver 100 as shown in FIG. 4, the workpiece W is simply received, and the workpiece is placed on a straight line connecting the center of the grinding wheel 105 and the contact point of the second receiving member 102 and the workpiece W. Since it can be said that the center of W has a center high angle c = 0 ° or a center height H = 0, the outer peripheral surface of the workpiece W after grinding becomes an odd-numbered equi-diameter strain circle and good circularity cannot be obtained. become.

  The present invention has been made in view of the above circumstances, and includes a workpiece receiver capable of receiving a workpiece so that the workpiece can be ground with high accuracy to obtain high roundness, and the same. The purpose is to provide a cylindrical grinder.

To achieve the above object, the present invention provides:
On a horizontal plane including two support portions provided at intervals, a workpiece support means for horizontally supporting a cylindrical workpiece by each of the support portions, and an axis of the workpiece supported by the workpiece support means An axial line is included, and is provided in a cylindrical grinding machine having a grinding wheel that abuts on the outer peripheral surface of the workpiece, and is arranged between support portions of the workpiece support means to rotatably support the workpiece. In receiving workpieces,
A first receiving member disposed on the lower side of the workpiece and having a receiving surface for receiving the workpiece;
A second receiving member disposed on the opposite side of the grinding wheel so as to sandwich the workpiece between the grinding wheel and a receiving surface for receiving a portion different from the first receiving member;
The first receiving member is arranged such that the angle of the normal of the receiving surface with respect to the axis of the workpiece is 15 ° to 30 ° from the vertical plane including the workpiece axis to the grinding wheel side. And
The second receiving member is disposed such that an angle of a normal line of the receiving surface with respect to the axis of the workpiece is 5 ° to 20 ° downward from a horizontal plane including the axis of the workpiece. It relates to the work receiving characterized by.

  In the present invention, the first receiving member is provided such that the angle of the normal of the receiving surface with respect to the workpiece axis is 15 ° to 30 ° from the vertical surface including the workpiece axis to the grinding wheel side. The second receiving member is provided such that an angle of the normal line of the receiving surface with respect to the axis of the workpiece is 5 ° to 20 ° downward from a horizontal plane including the axis of the workpiece.

  As described above, the inventors of the present invention speculate that the circular action similar to that of the centerless grinder works on the workpiece even in the cylindrical grinder that supports the workpiece by the support portions of the workpiece support means and the workpiece receiver. As a result of repeated research, if each receiving member is arranged as described above, the cylindrical grinder can support the workpiece in almost the same state as the workpiece support state in which accurate roundness can be obtained with the centerless grinder. It is based on having come to know that it is possible.

  That is, in the centerless grinding machine, an angle formed by a straight line connecting the center of the grinding wheel and the center of the adjustment wheel and a straight line connecting the center of the grinding wheel and the center of the workpiece is a, and the center of the grinding wheel and the adjustment wheel The angle between the straight line connecting the center and the straight line connecting the center of the adjustment wheel and the center of the workpiece is b, and the distance between the straight line connecting the center of the grinding wheel and the center of the adjustment wheel and the center of the workpiece If H is a heart height and a + b = c is a heart high angle, an odd-numbered equal-diameter strain circle is likely to occur when the heart high angle c is smaller than 7 °, and an even angle different when the heart high angle c is larger than 7 °. Since radial distortion circles are likely to occur, it is said that an optimum circular action can be obtained when the center height H is such that the center angle c is 7 °. The workpiece can be supported at a heart height H such that the heart angle c is about 7 °. Set the center of the workpiece above the straight line connecting the center of the grinding wheel and the portion where the second receiving member receives the workpiece, and set the center height to a value that is neither too large nor too small. Can be within a certain range including about 7 °.

  In the cylindrical grinding machine, the grinding wheel grinds not only the part of the workpiece that is restrained by the workpiece receiver but also the portion that is not restrained, and the rotating workpiece is placed between the second receiving member and the workpiece. The tangential resistance acts, and the axis of the workpiece and the grinding wheel is on the same horizontal plane, but in the centerless grinding machine, the workpiece is restrained by the grinding wheel, support blade and adjustment wheel over almost the entire length, and Since the rotating speed of the adjusting wheel and the work is the same, resistance does not act between the adjusting wheel and the work in the tangential direction of the work, and the axis of the work and the grinding wheel is not on the same horizontal plane. The grinding machine and the centerless grinding machine are greatly different in configuration. With respect to the arrangement of the receiving members as described above, the arrangement relationship of the centerless grinding machine cannot be directly applied to the cylindrical grinding machine. It can not be readily apparent to for.

  Further, the present invention relates to a cylindrical grinder provided with the workpiece receiver, and the above-described effects can be obtained also in this cylindrical grinder.

  Thus, according to the workpiece receiver and the cylindrical grinder provided with the workpiece receiver according to the present invention, an optimum circular action similar to that of the centerless grinder can be obtained, and the workpiece can be ground with high accuracy to achieve high circularity. Can be obtained.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a plan view showing a schematic configuration of a cylindrical grinding machine according to an embodiment of the present invention, FIG. 2 is a cross-sectional view in the direction of arrows AA in FIG. 1, and FIG. It is sectional drawing which showed schematic structure of the workpiece receiver.

  As shown in FIGS. 1 to 3, the cylindrical grinding machine 1 of this example is provided with a bed 31 and a spindle base that is disposed at a distance and horizontally supports a cylindrical and long workpiece W to be ground. 32 and a tailstock 37, a work rotation drive mechanism (not shown) for rotating the work W around its axis, and a slidable movement in the left-right direction, which is the axial direction of the work W, are provided on the bed 31, and the main spindle on the upper surface A table 40 on which the table 32 and the tailstock 37 are disposed, a table feed mechanism 41 for moving the table 40, and a grindstone provided on the bed 31 so as to be movable in the front-rear direction, which is a horizontal direction perpendicular to the axis of the workpiece W. A grinding wheel 46 that is supported by the grinding wheel base 45, is rotatably supported about the axis of the workpiece W in parallel with the axis of the workpiece W, and is in contact with the outer peripheral surface of the workpiece W to grind the grinding wheel 46. Around the axis Comprising a grinding wheel rotation drive mechanism 50 for a wheel head feed mechanism 55 for moving the wheel head 45, and work receiving 5 rotatably supports the workpiece W between the headstock 32 and tailstock 37.

  The spindle stock 32 is attached to the one end side of the workpiece W, a spindle 34 provided coaxially and rotatably with the workpiece W to be supported, a center 34 and a rotating plate 35 provided at the tip of the spindle 33, and a rotating plate. And a rotating metal 36 that engages with and rotates together with the same, and supports one end side of the workpiece W by the center 34. The work rotation driving mechanism (not shown) is built in the headstock 32, and rotates the main shaft 33 to rotate the rotating plate 35, the rotating metal 36 and the work W integrally in the direction of the arrow.

  The tailstock 37 includes a center 38 provided coaxially with the workpiece W to be supported, a mechanism (not shown) for moving the center 38 in the axial direction thereof, and a mechanism (not shown) for fixing the center 38 at an arbitrary position. And the other end side of the workpiece W is supported by the center 38.

  The table feed mechanism 41 is fixed to a servo motor 42 fixed to the bed 31, a ball screw 43 provided in parallel to the axial direction of the workpiece W and rotated about the axis by the servo motor 42, and a lower surface of the table 40. And a nut 44 that is screwed into the ball screw 43 and moves along the ball screw 43, and the table 40 is moved in the left-right direction together with the nut 44 by the rotation of the ball screw 43.

  The grinding wheel platform 45 is disposed on the rear side of the bed 31, and the grinding wheel 46 is arranged on a horizontal plane including the axis of the workpiece W (the main shaft 32 and the tail shaft 37). It arrange | positions at the side and the rotating shaft 47 protrudes from the both sides | surfaces of the grindstone base 45. As shown in FIG. The grinding wheel rotation drive mechanism 50 is fixed to a drive motor 51 fixed on the upper surface of the grinding wheel base 45, a pulley 52 fixed to the output shaft of the drive motor 51, and one end of a rotation shaft 47 of the grinding wheel 46. A pulley 53 provided and a transmission belt 54 stretched between the pulleys 52, 53 are provided, and the rotational power of the drive motor 51 is transmitted to the grinding wheel 46 via the pulley 52, the transmission belt 54 and the pulley 53. And rotate it in the direction of the arrow.

  The grinding wheel base feed mechanism 55 is provided with a servo motor 56 fixed to the bed 31, a ball screw 57 provided in a horizontal direction perpendicular to the axis of the workpiece W, and rotated about the axis by the servo motor 56, and the grinding wheel base 45. And a nut 58 that is screwed into the ball screw 57 and moves along the ball screw 57. The grindstone base 45 is moved in the front-rear direction together with the nut 58 by the rotation of the ball screw 57.

  The workpiece receiver 5 is provided on the lower side of the workpiece W, receives a first receiving member 11, arranged on the lateral side of the workpiece W, receives the second receiving member 12, and on the upper surface of the table 40. Provided with a plurality of support structures 10 constituted by support members 13 that support the receiving members 11 and 12, and each of the support structures 10 is disposed between the headstock 32 and the tailstock 37. It is provided at regular intervals along the axial direction of the workpiece W.

  The first receiving member 11 is configured in a rectangular block shape, and a surface 11a facing the workpiece W is formed in a flat shape, and the facing surface 11a is a receiving surface for receiving the workpiece W. Further, the first receiving member 11 has an angle α with respect to the normal line of the receiving surface 11 a centered on the axis of the workpiece W (the main shaft 32 and the tail shaft 37) from a vertical plane including the axis of the workpiece W. It arrange | positions so that it may become 15 degrees-30 degrees on the grinding wheel 46 side.

  Similarly to the first receiving member 11, the second receiving member 12 is configured in a rectangular block shape, and a facing surface 12a facing the workpiece W is formed in a flat shape, and the facing surface 12a receives the workpiece W. Is different from the first receiving member 11 in that it is disposed on the side of the workpiece W so as to sandwich the workpiece W between the grinding wheel 46 and the first receiving member 11. Yes. In addition, the second receiving member 12 has an angle γ with respect to the normal line of the receiving surface 12a centered on the axis of the workpiece W (the main shaft 32 and the tail shaft 37) that is lower than the horizontal plane including the axis of the workpiece W. It is arrange | positioned so that it may become 5 degrees-20 degrees.

  According to the cylindrical grinding machine 1 of the present example configured as described above, for example, the workpiece W is supported by the headstock 32, the tailstock 37, and the workpiece receiver 5, and the grinding wheel 46 is moved by the grinding wheel platform feed mechanism 55. After the grinding wheel base 45 is moved and positioned so as to have a predetermined cutting amount with respect to W, the workpiece W and the grinding wheel 46 are moved in a predetermined direction by the workpiece rotation driving mechanism (not shown) and the grinding wheel rotation driving mechanism 50, respectively. In this state, the grindstone table 45 is moved along the axial direction of the workpiece W by the table feed mechanism 41, whereby the outer peripheral surface of the workpiece W is ground by the grinding wheel 46.

  As described above, in the cylindrical grinding machine 1 of the present example, the first receiving member 11 is a vertical surface in which the normal α of the receiving surface 11a and the angle α around the axis of the workpiece W includes the axis of the workpiece W. Is provided on the grinding wheel 46 side so as to be 15 ° to 30 °, and the second receiving member 12 has an angle γ of the normal line of the receiving surface 12a with respect to the axis of the workpiece W as the axis of the workpiece W. It is provided so as to be 5 ° to 20 ° downward from the horizontal plane.

  In this way, one end and the other end of the long workpiece W are supported by the head stock 32 and the tailstock 37, respectively, and the outer peripheral surface of the workpiece W between the head stock 32 and the tailstock 37 is a workpiece receiving portion. In the case of grinding with support by 5, the inventors of the present application presumed that the circular action similar to that of the centerless grinding machine 110 works on the workpiece W and repeated research. , 12 in the cylindrical grinder 1, it can be found that the workpiece W can be supported in substantially the same state as the workpiece W in which the centerless grinder 110 can obtain accurate roundness. It is based on what has been achieved.

  That is, in the centerless grinding machine 110, generally, an angle formed by a straight line connecting the center of the grinding wheel 111 and the center of the adjustment wheel 113 and a straight line connecting the center of the grinding wheel 111 and the center of the workpiece W is defined as a. The angle between the straight line connecting the center of the grinding wheel 111 and the center of the adjustment wheel 113 and the straight line connecting the center of the adjustment wheel 113 and the center of the workpiece W is b, and the center of the grinding wheel 111 and the adjustment wheel 113 If the distance H between the straight line connecting the center and the center of the workpiece W is a center height and a + b = c is a center height angle, an odd-numbered equidistant strain circle is formed when the center height angle c is smaller than 7 °. Even when the center high angle c is larger than 7 °, even-numbered different-diameter strain circles are likely to be generated. Therefore, an optimal circular action can be obtained when the center high angle c is 7 °. The receiving members 11 and 12 are arranged as described above. Thus, the workpiece W can be supported at a center height H such that the center angle c is about 7 °, that is, the center of the grinding wheel 46 and the portion where the second receiving member 12 receives the workpiece W (second The center of the workpiece W is positioned above the straight line connecting the receiving member 12 and the contact point of the workpiece W, and the heart height is set to a value that is neither too high nor too low. It can be within a certain range including 7 °.

  In the cylindrical grinding machine 1, the grinding wheel 46 grinds not only the portion of the workpiece W that is restrained by the workpiece receiver 5 but also the portion that is not restrained, and the rotating workpiece W has the second receiving member 12. In addition, the tangential resistance of the workpiece W acts between the workpiece W and the axis of the grinding wheel 46 are on the same horizontal plane. However, in the centerless grinding machine 110, the workpiece W extends over the entire length of the grinding wheel. 111, the support blade 112 and the adjustment wheel 113 are restrained, and the rotation speed of the adjustment wheel 113 and the work W is the same, and no resistance acts between the adjustment wheel 113 and the work W in the tangential direction of the work W. Furthermore, since the axes of the workpiece W and the grinding wheel 113 are not on the same horizontal plane, the cylindrical grinding machine 1 and the centerless grinding machine 110 are greatly different in configuration, and the receiving members 11 and 12 are configured as described above. Arrangement For that, it is not possible to apply the arrangement of centerless grinding machine 110 as a cylindrical grinding machine 1, not be readily apparent to those skilled in the art.

  As described above, according to the cylindrical grinder 1 of this example, an optimum circular action similar to that of the centerless grinder 110 can be obtained, so that the workpiece W can be ground with high accuracy to obtain high roundness. Can do.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect which this invention can take is not limited to this at all.

  It is not always necessary to provide a plurality of the support structures 10, and one support structure 10 may be provided. Moreover, the said cylindrical grinding machine 1 is only what showed an example, and the structure and operation | movement are not limited to what was mentioned above. Moreover, as the workpiece | work W used as grinding object, the screw axis | shaft of a ball screw etc. can be mentioned as an example, for example. When grinding the thread groove of a ball screw, the roundness of the screw shaft is very important because the outer diameter is the reference.

It is the top view which showed schematic structure of the cylindrical grinding machine which concerns on one Embodiment of this invention. It is sectional drawing of the arrow AA direction in FIG. It is sectional drawing which showed schematic structure of the workpiece receiver. It is sectional drawing which showed an example of the workpiece receiver which concerns on a prior art example. It is sectional drawing which showed schematic structure of the centerless grinding machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical grinder 5 Work receiving 10 Support structure 11 1st receiving member 12 2nd receiving member 13 Supporting member 31 Bed 32 Spindle head 37 Tailstock 40 Table 41 Table feed mechanism 45 Grinding wheel base 46 Grinding wheel 50 Grinding wheel rotation drive Mechanism 55 Wheelhead feed mechanism W Workpiece

Claims (2)

On a horizontal plane including two support portions provided at intervals, a workpiece support means for horizontally supporting a cylindrical workpiece by each of the support portions, and an axis of the workpiece supported by the workpiece support means An axial line is included, and is provided in a cylindrical grinding machine having a grinding wheel that abuts on the outer peripheral surface of the workpiece, and is arranged between support portions of the workpiece support means to rotatably support the workpiece. In receiving workpieces,
A first receiving member disposed on the lower side of the workpiece and having a receiving surface for receiving the workpiece;
A second receiving member disposed on the opposite side of the grinding wheel so as to sandwich the workpiece between the grinding wheel and a receiving surface for receiving a portion different from the first receiving member;
The first receiving member is arranged such that the angle of the normal of the receiving surface with respect to the axis of the workpiece is 15 ° to 30 ° from the vertical plane including the workpiece axis to the grinding wheel side. And
The second receiving member is disposed such that an angle of a normal line of the receiving surface with respect to the axis of the workpiece is 5 ° to 20 ° downward from a horizontal plane including the axis of the workpiece. Work receiving characterized by On a horizontal plane including two support portions provided at intervals, a workpiece support means for horizontally supporting a cylindrical workpiece by each of the support portions, and an axis of the workpiece supported by the workpiece support means In a cylindrical grinding machine provided with a grinding wheel that is arranged so as to include an axis and abuts on the outer peripheral surface of the workpiece,
A cylindrical grinder further comprising the workpiece receiver according to claim 1.

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