JP2010042488A - Workpiece receiver and grinding machine including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece receiver suppressing generation of frictional heat and causing little abrasion to a receiving member by reducing frictional force between a workpiece and the receiving member. <P>SOLUTION: This workpiece receiver 5 is provided in a grinding machine including a workpiece support mechanism for horizontally supporting the cylindrical workpiece W by support parts provided with a space, a workpiece rotating and driving mechanism for rotating the workpiece W supported by the workpiece support mechanism, and a grinding wheel 46 abutting on an outer peripheral part of the workpiece W to perform grinding. 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 is a first receiving member 11 arranged on a lower side of the workpiece W, and includes a recessed part 12 opened in a surface opposed to the workpiece W, a porous body 13 provided to close an opening region of the recessed part 12 and having a surface to be a circular arc-shaped receiving surface 13a, and a pressurized fluid supply device 20 to supply pressurized fluid into the recessed part 12 and to discharge the pressurized fluid from the surface of the porous body 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is disposed between the support portions of a grinding machine that rotates a workpiece, the positions of which are spaced apart in the axial direction by the two support portions of the workpiece support means, around the axis line and performs grinding with a grinding wheel. The present invention relates to a workpiece receiver that rotatably supports the workpiece, and a grinder equipped 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 Disposed between the head table and the tailstock on the upper surface of the table, and a work receiver that rotatably supports the work, a table feed mechanism that moves the table, and a grindstone that contacts the outer peripheral surface of the work A wheel, a grinding wheel base that is mounted on a bed so as to be movable in a horizontal direction perpendicular to the axis of the workpiece, and that supports the grinding wheel rotatably about its axis, and a grinding wheel rotation drive that rotates the grinding wheel about its axis Mechanism and grinding wheel Comprising a like wheel head feed mechanism for moving the.

  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. A first receiving member that is provided on the lower side of the workpiece and that contacts the outer peripheral surface of the workpiece; a second receiving member that is disposed on the opposite side of the workpiece from the contacting side of the grinding wheel and contacts the outer peripheral surface of the workpiece; A supporting member for supporting each receiving member is provided, and one supporting structure including the first receiving member, the second receiving member, and the supporting member is provided between the headstock and the tailstock, or the headstock. And a plurality of tailstocks are provided at regular intervals along the work axis direction.

  In the grinding machine configured in this way, the grinding wheel base is moved and positioned 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. Thereafter, 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, and the outer peripheral portion of the workpiece is moved. To be ground.

JP-A-61-65723

  However, in the above conventional grinding machine, the work rotates in contact with each receiving member of the work receiver, and frictional heat is generated between the work and each receiving member, so that the work is thermally expanded. When the workpiece is ground in this thermally displaced state, there has been a problem in that the grinding accuracy of the workpiece is reduced due to a shift corresponding to the amount of thermal displacement at the feed position of the grinding wheel in the workpiece axis direction. For example, when thread grinding a workpiece, the lead accuracy of the screw is lowered due to thermal displacement of the workpiece.

  In addition, since each receiving member is worn by contact with the workpiece, the contact surface of each receiving member with the workpiece is subjected to surface treatment to make it difficult to wear, or the worn receiving member must be periodically replaced. There was an extra cost.

  The present invention has been made in view of the above circumstances, and it is possible to reduce the friction force acting between the workpiece and the receiving member to suppress the generation of frictional heat or to make the receiving member difficult to wear. An object of the present invention is to provide a workpiece receiver that can be used and a grinding machine equipped with the workpiece receiver.

To achieve the above object, the present invention provides:
Two support portions provided at intervals are provided, and a work support means for horizontally supporting a cylindrical workpiece by each of the support portions, and a work supported by the work support means are rotated about its axis. A workpiece that is provided in a grinding machine that includes a workpiece rotation driving means and a grinding wheel that abuts on the outer peripheral portion of the workpiece to perform grinding, and supports the workpiece rotatably between the support portions of the workpiece support means. In receiving
A first receiving member disposed between the support portions of the workpiece support means and below the workpiece, and having an arc-shaped receiving surface for receiving the workpiece;
According to a workpiece receiver, the apparatus includes a pressurized fluid supply unit that supplies a pressurized fluid between a receiving surface of the first receiving member and an outer peripheral surface of the workpiece.

  According to this invention, the workpiece is supported by the pressurized fluid (for example, air or oil) supplied between the receiving surface of the first receiving member and the outer peripheral surface of the workpiece by the pressurized fluid supply means. It can prevent that the receiving surface of 1 receiving member and the outer peripheral surface of a workpiece | work contact directly. Therefore, even if the work rotates, the friction force hardly acts between the work and the receiving surface, the generation of frictional heat can be suppressed, and the work can be cooled by the pressurized fluid.

  As a result, the temperature of the workpiece can be prevented from rising, and the workpiece can be ground with high accuracy by preventing thermal displacement of the workpiece. In addition, it is not necessary to perform a surface treatment or the like on the receiving surface of the first receiving member to improve wear resistance, and it is unnecessary to periodically replace the first receiving member, so that the cost of receiving the workpiece can be reduced.

  The first receiving member includes a concave portion that opens to a surface facing the workpiece, and a porous body that is provided so as to close an opening region of the concave portion and whose surface is the receiving surface. The body has a plurality of communication holes formed so as to open on the front and back sides, and the pressurized fluid supply means is configured to supply the pressurized fluid into the recess and discharge it from the surface of the porous body. May be. Alternatively, the first receiving member may be formed with a recessed groove opening in the receiving surface, and the pressurized fluid supply means may be configured to supply pressurized fluid into the recessed groove.

  By providing a porous body or a concave groove in this way, even if a spiral groove exists like a male screw, the workpiece can be pressurized fluid discharged from the surface of the porous body, It is supported by the pressurized fluid supplied in the concave groove, and can prevent direct contact between the receiving surface and the outer peripheral surface of the workpiece, and the workpiece is cooled by the pressurized fluid between the receiving surface and the workpiece. Therefore, the same effect as described above can be obtained. In addition, examples of the porous body include a sintered body, and examples of the material include metals such as copper and carbon. The depth of the concave groove is preferably about 3 to 15 μm.

  The workpiece receiver is an outer circumferential surface of the workpiece opposite to the outer circumferential surface with which the grinding wheel abuts, and an arc-shaped receiving surface for receiving a portion different from the first receiving member is formed. A second receiving member, and the pressurized fluid supply means is configured to supply pressurized fluid between the receiving surfaces of the first receiving member and the second receiving member and the work outer peripheral surface. May be.

  If it does in this way, it can prevent by a 2nd receiving member that a workpiece | work bends when the grinding force of the normal direction of a grinding wheel acts on a workpiece | work, and a workpiece | work can be ground with high precision. In addition, the pressurized fluid supplied between the receiving surface of the second receiving member and the work outer peripheral surface makes it difficult for the receiving surface and the work outer peripheral surface to be in direct contact with each other, and the work is cooled. The effect of can be obtained. In addition, the said 2nd receiving member may be equipped with the recessed part and the porous body similarly to the said 1st receiving member, or may be provided with the ditch | groove.

  The pressurized fluid may be composed of grinding oil. In this way, it is not necessary to separately handle the grinding fluid supplied between the receiving surface and the outer peripheral surface of the workpiece and the grinding oil appropriately supplied to the contact portion of the workpiece and the grinding wheel. Becomes easy.

  Further, the present invention relates to a grinding machine provided with the workpiece receiver, and the above-described effects can be obtained also in this grinding machine. In addition, as a grinding machine, various things can be mentioned, As a specific example, a cylindrical grinding machine and a screw grinding machine are mentioned, for example.

  As described above, according to the workpiece receiver and the grinding machine equipped with the workpiece receiver according to the present invention, the frictional force acting between the workpiece and the receiving member is reduced to suppress the generation of frictional heat, or the receiving member. Therefore, the work can be ground with high accuracy, and the cost for surface treatment and periodic replacement of the receiving member can be saved.

  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 screw 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. FIG. 4 is a perspective view showing a schematic configuration of a work receiver, and FIG. 4 is a cross-sectional view of the work receiver shown in FIG.

  As shown in FIGS. 1 to 4, the screw grinding machine 1 of this example is provided with a bed 31 and a spindle base that is disposed at an interval 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. The base 45 is supported by the grinding wheel base 45 so that its axis is located in a vertical plane parallel to the axis of the workpiece W and is rotatable about the axis, and abuts on the outer peripheral surface of the workpiece W to perform thread grinding. Grinding wheel 46 and grinding wheel Grinding wheel rotation drive mechanism 50 for rotating 46 around its axis, grinding wheel base feed mechanism 55 for moving grinding wheel base 45, and work for supporting work W rotatably between spindle stock 32 and tailstock 37 It includes a receptacle 5 and the like. In addition, the said workpiece | work W shall grind the thread groove of the workpiece | work (screw axis | shaft) W by which the thread groove of the ball screw was previously formed in the outer peripheral surface with the lathe etc., for example.

  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.

  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 arranged so as to be inclined so that the rotation shaft 47 of the grinding wheel 46 is inclined by the same angle as the lead angle of the ball screw to be ground from a state parallel to the axis of the workpiece W (horizontal). Arranged on the rear side. The grinding wheel 46 is arranged on the lateral side of the workpiece W, and the rotation shaft 47 protrudes from both side surfaces of the grinding wheel base 45.

  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. The pulley 53 provided and a transmission belt 54 spanned 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.

  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 15, and on the upper surface of the table 40. A plurality of support structures 10 that are provided and configured to support the receiving members 11, 15, and each of the receiving members 11, 15 of the support structure 10 and the workpiece W with pressurized grinding oil. And a grinding oil supply device 20 for supplying between the outer peripheral surface, and the support structure 10 is provided between the spindle stock 32 and the tailstock 37 at a constant interval along the axial direction of the workpiece W. Yes.

  The first receiving member 11 is formed in a rectangular block shape, and is provided so as to close the concave portion 12 opened on the surface 11a facing the workpiece W and the opening area of the concave portion 12, and open on the front and back sides. A porous body 13 having a plurality of communicating pores (communication holes), and a flow path 14 that opens to the inner surface of the recess 12 and the outer surface of the first receiving member 11 are provided. And the surface 11a facing the workpiece W including the surface 13a of the porous body 13 is a receiving surface for receiving the workpiece W. Further, the first receiving member 11 is arranged so that the arc centers of the receiving surfaces 11a and 13a and the center of the work W are coaxial, for example, and the receiving surfaces 11a and 13a have the same radius as the work W, for example. The circular arc surface or the circular arc surface having a radius corresponding to the outer diameter of the workpiece W, such as a circular arc surface having a radius larger than the radius of the workpiece W by a certain value, is formed. Examples of the porous body 13 include a sintered body, and examples of the material include metals such as copper and carbon.

  The second receiving member 15 has the same configuration as the first receiving member 11, but is arranged on the side of the workpiece W so as to sandwich the workpiece W between the grinding wheel 46, 1 is different in that it receives a different part from the receiving member 11.

  The grinding oil supply device 20 includes a supply unit 21 that supplies pressurized grinding oil, a supply pipe 22 that connects the supply unit 21 and the flow paths 14 of the receiving members 11 and 15, and a supply unit 21. It comprises a grinding oil cooler (not shown) for cooling the supplied grinding oil. In this grinding oil supply device 20, the grinding oil is pressurized and supplied to each flow path 14 from the supply section 21 via the supply pipe 22 and is cooled and controlled to a constant temperature by a grinding oil cooler (not shown). Is supplied, the supplied grinding oil flows into the recess 12, then flows through the communication holes of the porous body 13 and is discharged from the surface of the porous body 13.

  According to the screw 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 rotated by the workpiece rotation driving mechanism (not shown) and the grinding wheel rotation driving mechanism 50, respectively. In this state, the grinding wheel 46 is moved from the other end side of the workpiece W to the one end side by the table feed mechanism 41, and the thread groove on the outer peripheral surface of the workpiece W is ground by the grinding wheel 46. At this time, the rotation of the workpiece W by the workpiece rotation drive mechanism (not shown) and the relative movement of the grinding wheel 46 by the table feed mechanism 41 in the workpiece W axis direction are controlled to be synchronized.

  As described above, in the thread grinding machine 1 of this example, the workpiece W is discharged from the surface of the porous body 13 and supplied between the receiving surfaces 11a and 13a of the receiving members 11 and 15 and the outer peripheral surface of the workpiece W. Therefore, the receiving surfaces 11a and 13a of the receiving members 11 and 15 and the outer peripheral surface of the workpiece W can be prevented from coming into direct contact with each other. Therefore, even if the workpiece W is rotated, the frictional force hardly acts between the workpiece W and the receiving surfaces 11a and 13a, the generation of frictional heat can be suppressed, and the workpiece W is cooled by the grinding oil. You can also.

  As a result, the temperature of the workpiece W can be prevented from rising, and the workpiece W can be ground with high accuracy by preventing thermal displacement of the workpiece W. Further, the receiving surfaces 11a and 13a of the receiving members 11 and 15 are not subjected to surface treatment or the like to improve wear resistance, and the receiving members 11 and 15 are not required to be replaced regularly, so that the cost of the work receiving 5 can be reduced. Can be planned.

  Further, in the thread groove portion of the outer peripheral surface of the workpiece W, the pressure of the grinding oil supplied between the receiving surfaces 11a and 13a of the receiving members 11 and 15 and the outer peripheral surface of the workpiece W is reduced, but the porous body 13 Since the grinding oil can be uniformly discharged from the entire surface 13a of the porous body 13, the pressure (supporting force) of the grinding oil can be made difficult to decrease, The workpiece W can be favorably supported. In addition, the thread groove is a ball screw thread groove, and the pitch is longer than that of a general metric screw, etc., and an outer peripheral surface without a thread groove having a certain area or more is formed between the pitches. The pressure is less affected by the thread groove.

  Further, since the grinding force in the normal direction of the grinding wheel 46 acting on the workpiece W is received by the second receiving member 15, the workpiece W can be prevented from being bent by this grinding force, and the workpiece W is increased in height. It can be ground accurately. In addition, since the grinding oil is supplied between the receiving surfaces 11a and 13a of the receiving members 11 and 15 and the outer peripheral surface of the workpiece W, the grinding oil and the contact portions of the workpiece W and the grinding wheel 46 are appropriately used. It is not necessary to handle the supplied grinding oil separately, and the handling can be facilitated.

  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.

  In the above example, the workpiece W is received via the grinding oil discharged from the surface 13a of the porous body 13. However, the present invention is not limited to this, and as shown in FIGS. 61 and the second receiving member 64 may be configured.

  In this case, the first receiving member 61 is formed in a rectangular block shape, and has a concave groove 62 that opens on a surface 61 a facing the workpiece W, an inner surface of the concave groove 62, and an outer surface of the first receiving member 61. And a flow path 63 that is open. A surface 61 a of the first receiving member 61 facing the workpiece W is a receiving surface for receiving the workpiece W, and the receiving surface 61 a has the same arc as the receiving surfaces 11 a and 13 a of the first receiving member 11. Formed on the surface. The second receiving member 64 has the same configuration as the first receiving member 61 and is disposed at the same position as the second receiving member 15. The grinding oil supply device 20 supplies pressurized grinding oil into the flow path 63. The depth of the concave groove 62 is preferably about 3 to 15 μm. Further, it is desirable that the width of each receiving member 61, 64 in the axial direction of the workpiece W is an integral multiple of the thread groove lead so that the amount of grinding oil escaped from the recessed groove 62 is uniform.

  In this way, the workpiece W is supplied from the grinding oil supply device 20 through the flow path 63 into the concave groove 62 and supplied between the receiving surface 61a of each receiving member 61, 64 and the outer peripheral surface of the workpiece W. Therefore, the receiving surface 61a and the outer peripheral surface of the workpiece W can be prevented from coming into direct contact with each other, and the workpiece W can be prevented by the grinding oil between the receiving surface 61a and the workpiece W. Can be cooled. Therefore, the same effect as described above can be obtained.

  In the above example, the screw grinder 1 that performs thread grinding on the workpiece W has been described as an example. However, the present invention is not limited thereto, and the present invention is applied to a cylindrical grinder that grinds the outer peripheral surface of the workpiece W. Can also be applied. In this case, unlike the case where the thread groove is ground, there is no recess on the outer peripheral surface of the workpiece W. Therefore, the receiving surfaces 11a, 13a, 61a of the receiving members 11, 15, 61, 64 and the outer peripheral surface of the workpiece W The pressure of the grinding oil supplied between the two is not reduced, and the workpiece W can be received in a more stable state than when thread grinding.

  Further, compressed air may be supplied instead of the grinding oil between the receiving surfaces 11a, 13a, 61a of the receiving members 11, 15, 61, 64 and the outer peripheral surface of the workpiece W. Furthermore, it is not always necessary to provide a plurality of the support structures 10, and one support structure 10 may be provided.

It is a top view showing a schematic structure of a screw grinding machine concerning one embodiment of the present invention. It is sectional drawing of the arrow AA direction in FIG. It is the perspective view which showed schematic structure of the workpiece receiver. It is sectional drawing of the workpiece receiver shown in FIG. It is the perspective view which showed the workpiece receiver which concerns on other embodiment of this invention. It is sectional drawing of the workpiece receiver shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screw grinding machine 5 Work receiving 10 Support structure 11 1st receiving member 12 Recess 13 Porous body 15 2nd receiving member 20 Grinding oil supply device 31 Bed 32 Spindle base 37 Tailstock 40 Table 41 Table feed mechanism 45 Grinding stone base 46 Grinding wheel 50 Grinding wheel rotation drive mechanism 55 Grinding wheel base feed mechanism W Workpiece

Claims (6)

Two support portions provided at intervals are provided, and a work support means for horizontally supporting a cylindrical workpiece by each of the support portions, and a work supported by the work support means are rotated about its axis. A workpiece that is provided in a grinding machine that includes a workpiece rotation driving means and a grinding wheel that abuts on the outer peripheral portion of the workpiece to perform grinding, and supports the workpiece rotatably between the support portions of the workpiece support means. In receiving
A first receiving member disposed between the support portions of the workpiece support means and below the workpiece, and having an arc-shaped receiving surface for receiving the workpiece;
A workpiece receiver comprising a pressurized fluid supply means for supplying a pressurized fluid between a receiving surface of the first receiving member and an outer peripheral surface of the workpiece. The first receiving member includes a concave portion that opens to a surface facing the workpiece, and a porous body that is provided so as to close an opening region of the concave portion, and a surface of which is the receiving surface. , Having a plurality of communication holes formed to open on the front and back,
The workpiece receiver according to claim 1, wherein the pressurized fluid supply means is configured to supply a pressurized fluid into the recess and discharge the pressurized fluid from the surface of the porous body. The first receiving member is formed with a concave groove opening in the receiving surface,
The workpiece receiver according to claim 1, wherein the pressurized fluid supply means is configured to supply a pressurized fluid into the concave groove. A second receiving member formed with an arcuate receiving surface that is an outer peripheral surface opposite to the outer peripheral surface with which the grinding wheel abuts and is different from the first receiving member; Prepared
2. The pressurized fluid supply means is configured to supply pressurized fluid between each receiving surface of the first receiving member and the second receiving member and a work outer peripheral surface. A work receiver as defined in any one of 3 to 4.   The workpiece receiver according to claim 1, wherein the pressurized fluid is made of grinding oil. Two support portions provided at intervals are provided, and a work support means for horizontally supporting a cylindrical workpiece by each of the support portions, and a work supported by the work support means are rotated about its axis. In a grinding machine comprising a work rotation driving means and a grinding wheel for grinding in contact with the outer periphery of the work,
6. A grinding machine, further comprising the workpiece receiver according to any one of claims 1 to 5.

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