JP2007190646A - Device and method for supplying workpiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for supplying a workpiece, which device can efficiently supply the workpiece. <P>SOLUTION: The device 13 for supplying the workpiece is arranged so as to be nearly parallel to the horizontal direction, and has a first rotary shaft 17a and a second rotary shaft 17b, which are arranged so as to be oppositely tilted in the vertical direction respectively. Further, the device 13 for supplying the workpiece makes the first and second rotary shafts 17a, 17b rotate in the same direction, and supplies a plurality of the workpieces 11 to a centerless grinder 12 by pushing the workpieces while rotating, the workpieces 11 being continuously put on the first and second rotary shafts 17a, 17b. In this case, the peripheral speed of the first rotary shaft 17a is different from the peripheral speed of the second rotary shaft 17b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a workpiece supply device and a workpiece supply method, and more particularly to a workpiece supply device that continuously supplies workpieces to a centerless grinder and a workpiece supply method that supplies workpieces to such a centerless grinder.

  Conventionally, when grinding the outer peripheral surface of a workpiece, etc., it has been ground using, for example, a centerless grinding machine disclosed in Japanese Patent Laid-Open No. 5-69290 (Patent Document 1).

  Here, the structure of the workpiece | work grinding apparatus using the centerless grinding machine shown in patent document 1 is demonstrated easily. The centerless grinding machine supports the grinding wheel provided rotatably, the adjustment wheel provided rotatably and arranged substantially parallel to the axis of the grinding wheel, and the cylindrical workpiece to be ground from below. And a blade to perform. The workpiece is continuously supplied between the grinding wheel and the adjusting wheel, and the outer peripheral surface thereof is ground by the rotation of the grinding wheel.

  In order to supply the workpiece to the centerless grinding machine, it is common to use a workpiece supply device that sequentially feeds a plurality of workpieces by rotating a rotating shaft and sequentially supplies the workpieces. The workpiece supply device includes a pair of rotation shafts arranged in the horizontal direction, and each rotation shaft has a slight angle with each other in the vertical direction.

  A plurality of workpieces are placed in series on a pair of rotating shafts, and by rotating these rotating shafts, a predetermined feed force is applied to the workpieces, and the workpieces are sequentially pushed forward. In this way, the workpiece is continuously supplied between the grinding wheel of the centerless grinding machine and the adjusting wheel, and the outer peripheral surface of the workpiece is ground.

Here, the grinding degree of the outer peripheral surface of the workpiece ground by the centerless grinder, that is, the cylindricity of the workpiece has a predetermined relationship with the feed force of the workpiece. Therefore, a workpiece having a desired cylindricity cannot be obtained unless the workpiece is fed with an optimum workpiece feeding force. Specifically, if the workpiece feed force is too small, the diameter on the front side in the traveling direction of the outer peripheral surface of the workpiece is reduced, and conversely, if the workpiece feed force is too large, the workpiece advances on the outer peripheral surface of the workpiece. The diameter on the rear side is smaller. In order to optimize the cylindricity of the workpiece, it is necessary to feed the workpiece with an optimum feeding force in accordance with the shape and weight of the workpiece.
Japanese Patent Laid-Open No. 5-69290 (paragraph number 0012, FIG. 1, etc.)

  According to Patent Literature 1, the workpiece feeding force has a predetermined relationship with the above-described distance between the pair of rotating shafts. Therefore, in order to adjust the feed force for supplying the workpiece, the separation distance between the pair of rotating shafts is changed.

  However, with such adjustment of the workpiece feed force, the separation distance of the rotating shaft cannot be changed during workpiece grinding, so the workpiece supply device can be used several times until the optimum workpiece cylindricity is achieved. It is necessary to stop and change the separation distance of the rotary shaft, and it takes a lot of time and labor to adjust the feed force of the workpiece. Moreover, since the height of the workpiece | work with respect to a centerless grinding machine will also change if the separation distance of a rotating shaft is changed, much time and labor are involved also in this height adjustment. Furthermore, even if the distance between the rotating shafts is adjusted to achieve the optimum cylindricity, the grinding wheel gradually wears as the workpiece is ground, so adjustment is necessary again. Become. In such a case, if time and labor are required again for adjustment, productivity will be greatly hindered.

  An object of the present invention is to provide a workpiece supply device that can efficiently supply workpieces.

  Another object of the present invention is to provide a workpiece supply method capable of efficiently supplying a workpiece.

  The workpiece supply apparatus according to the present invention includes first and second rotating shafts that are disposed substantially parallel to the horizontal direction and are inclined in the opposite directions in the vertical direction. In addition, the workpiece supply device rotates the first and second rotating shafts in the same direction, and pushes the plurality of workpieces placed on the first and second rotating shafts while rotating them so as to perform centerless grinding. Supply to the board. Here, the peripheral speed of the first rotating shaft is a peripheral speed different from the peripheral speed of the second rotating shaft.

  The cylindricity of the workpiece to be ground has a predetermined relationship with the workpiece feed force, and the workpiece feed force is a circumferential ratio that is the ratio of the peripheral speed of the first rotary shaft to the peripheral speed of the second rotary shaft. It has a predetermined relationship with the speed ratio. Therefore, by setting the peripheral speed of the first rotating shaft and the peripheral speed of the second rotating shaft to different peripheral speeds, the peripheral speed between the peripheral speed of the first rotating shaft and the peripheral speed of the second rotating shaft is set. The ratio can be changed. If it does so, the feed force of a workpiece | work can be adjusted and, thereby, the precision of the cylindricity of a workpiece | work can be maintained and improved easily. Further, the time required for adjusting the separation distance of the rotary shafts and the process of adjusting the height of the work generated in association with this are unnecessary, and the adjustment time can be shortened. As a result, the workpiece can be supplied efficiently.

  Preferably, the peripheral speeds of the first and second rotating shafts can be changed. By doing so, the peripheral speeds of the first and second rotating shafts can be easily changed according to the shape and weight of the workpiece.

  More preferably, the rotation speeds of the first and second rotation shafts can be changed. By carrying out like this, the rotation speed of a 1st and 2nd rotating shaft can be changed, and the peripheral speed of a rotating shaft can be varied. In addition, since the rotational speeds of the first and second rotary shafts can be changed even during workpiece grinding, there is no need to stop the workpiece supply device or the like when adjusting the workpiece feed force. Therefore, the workpiece can be supplied more efficiently.

  More preferably, the rotation speeds of the first and second rotating shafts are changed by a transmission motor using an inverter. By comprising in this way, the rotation speed of the 1st and 2nd rotating shaft can be changed easily and efficiently.

  More preferably, of the first and second rotating shafts, the peripheral speed of the first rotating shaft at which the rotating direction at the contact portion with the workpiece is downward is the first rotating shaft at which the rotating direction at the contacting portion with the workpiece is upward. It is larger than the peripheral speed of the second rotating shaft.

  The workpiece feed force is also affected by the number of workpieces placed on the first and second rotating shafts. By making the peripheral speed of the first rotating shaft larger than the peripheral speed of the second rotating shaft, the feed force of the workpiece can be increased. If it does so, since the quantity of the workpiece | work mounted on the 1st and 2nd rotating shaft can be reduced, the length of a workpiece | work supply apparatus can be shortened and size reduction of a workpiece | work supply apparatus can be achieved.

  In another aspect of the present invention, a workpiece supply method includes first and second rotating shafts that are disposed substantially parallel to a horizontal direction and inclined in directions opposite to each other in a vertical direction. Using a workpiece supply device that rotates the second rotating shaft in the same direction and pushes the plurality of workpieces placed on the first and second rotating shafts while rotating and supplying the workpiece to the centerless grinding machine A workpiece supply method for supplying workpieces. Here, the work supply method supplies the work by changing the peripheral speed of the first rotating shaft and the peripheral speed of the second rotating shaft.

  If such a method is used, the workpiece feed force can be adjusted by making the peripheral speed of the first rotary shaft different from the peripheral speed of the second rotary shaft. Can do.

  According to the present invention, the peripheral speed of the first rotating shaft and the peripheral speed of the second rotating shaft are different from each other by changing the peripheral speed of the first rotating shaft and the peripheral speed of the second rotating shaft. The peripheral speed ratio can be changed. If it does so, the feed force of a workpiece | work can be adjusted and, thereby, the precision of the cylindricity of a workpiece | work can be maintained and improved easily. Further, the time required for adjusting the separation distance of the rotary shafts and the process of adjusting the height of the work generated in association with this are unnecessary, and the adjustment time can be shortened. As a result, the workpiece can be supplied efficiently.

  Also, with such a workpiece supply method, the workpiece feed force can be adjusted by making the peripheral speed of the first rotating shaft different from the peripheral speed of the second rotating shaft. Work can be supplied.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing a workpiece grinding apparatus. FIG. 2 is a schematic cross-sectional view of the centerless grinding machine included in the workpiece grinding apparatus shown in FIG. 1 as viewed from the side. FIG. 3 is a schematic view of a workpiece supply device included in the workpiece grinding apparatus shown in FIG. 1 as viewed from the side. In this case, the diagram shown in FIG. 1 is viewed from above. With reference to FIG. 1, FIG. 2, and FIG. 3, the structure of the workpiece | work supply apparatus and centerless grinding machine which concern on one Embodiment of this invention is demonstrated.

  The workpiece grinding device 10 includes a centerless grinding machine 12 and a workpiece supply device 13. The centerless grinding machine 12 includes a grinding wheel 14 that is rotatably provided, an adjustment wheel 15 that is rotatably provided, has an axis substantially parallel to the grinding wheel 14, and is provided at a position facing the grinding wheel 14, And a blade 16 that supports the workpiece 11 from below. The grinding wheel 14 and the adjusting wheel 15 rotate in the directions of arrows A and B in FIG. The work 11 supplied between the grinding wheel 14 and the adjusting wheel 15 is ground in its outer peripheral surface while rotating in the direction of arrow C in FIG. During the grinding process, the workpiece 11 is supported by the blade 16 from below. In this manner, the outer peripheral surface of the workpiece 11 is ground by the grinding wheel 14.

  The workpiece supply device 13 that supplies the workpiece 11 to the centerless grinding machine 12 includes a first rotating shaft 17a and a second rotating shaft 17b. As shown in FIG. 1, the first and second rotating shafts 17a and 17b are arranged substantially in parallel when viewed from above, and when viewed from the lateral direction, as shown in FIG. Inclined in the reverse direction. Specifically, in FIG. 3, the second rotation shaft 17 b disposed on the front side of the paper surface is directed downward with respect to the direction of the arrow E that is the traveling direction of the work 11, and the first rotation shaft 17 b disposed on the back side of the paper surface. The rotation shaft 17a is arranged with a slight inclination angle θr so as to face upward. The first and second rotary shafts 17a and 17b can rotate in the direction of arrow D in FIG. 1, respectively, and by this rotation, workpieces placed on the first and second rotary shafts 17a and 17b in a row. Apply feed force to 11.

  The first and second rotary shafts 17a and 17b are provided with speed change motors 21a and 21b using inverters, respectively. The first and second rotary shafts 17a and 17b can individually change the rotation speed by the transmission motors 21a and 21b. That is, the first and second rotating shafts 17a and 17b are configured so that the peripheral speed can be changed separately.

  Next, a method for grinding the workpiece 11 using the workpiece grinding apparatus 10 will be briefly described. First, a plurality of workpieces 11 are placed in series on the first and second rotary shafts 17a and 17b. Next, the first and second rotary shafts 17a and 17b are rotated by the transmission motors 21a and 21b, respectively. Then, the work 11 placed continuously on the first and second rotary shafts 17a and 17b is applied with feed force from the first and second rotary shafts 17a and 17b, and the direction of the arrow E in FIG. Pushed forward. Then, it is guided by the inlet guide plates 18 a and 18 b and supplied between the rotating grinding wheel 14 and the adjusting wheel 15. Thereafter, the outer peripheral surface is ground by the grinding wheel 14 and the adjusting wheel 15. After that, it is pushed forward sequentially, passes through the centerless grinding machine 12, and when grinding is completed, it is guided by the outlet guide plates 19a and 19b and discharged to the workpiece receiving portion 20.

  In this way, the work 11 is ground on the outer peripheral surface, and the cylindricity of the work 11 to be ground has a predetermined relationship with the feed force of the work 11. Specifically, when the feed force of the workpiece 11 is too small, the cylindricity on the front side in the traveling direction on the outer peripheral surface of the workpiece 11 is reduced. On the contrary, when the feeding force of the workpiece 11 is too large, the cylindricity on the rear side in the traveling direction on the outer peripheral surface of the workpiece 11 becomes small. Therefore, the cylindricity of the workpiece 11 can be adjusted by adjusting the feed force of the workpiece 11.

  Here, the details of the feed force of the workpiece 11 will be described. FIG. 4 is a schematic cross-sectional view including the workpiece 11 and the first and second rotating shafts 17a and 17b in the workpiece supply apparatus 13. Referring to FIG. 4, workpiece 11 receives reaction force QR from second rotating shaft 17b. Further, the reaction force QL from the first rotating shaft 17a is received. Therefore, the feed force Fs of the workpiece 11 is as follows.

Fs = μ × (QL + QR)
Fs: Feed force of workpiece 11 μ: Coefficient of friction between workpiece 11 and first and second rotary shafts 17a, 17b QL: Force (reaction force) received by workpiece 11 from first rotary shaft 17a
QR: force (reaction force) that the workpiece 11 receives from the second rotating shaft 17b
Here, the first and second rotating shafts 17a and 17b are inclined by θr. However, since θr is usually about 1 ° and is very small, αL = αR = α and QL = QR = Q. can do. Then, the above equation becomes as follows.

Fs = 2 × μ × Q = μ × W × cos α
The value of α can be calculated by α = sin ⁻¹ [Lc / (Dw + Dr)].

W: Weight of workpiece 11 Lc: Distance between first rotating shaft 17a and second rotating shaft 17b Dw: Diameter of workpiece 11 Dr: Diameter of first and second rotating shafts 17a, 17b αL: First Pressure contact angle αR between the rotary shaft 17a and the work 11: Pressure contact angle between the second rotary shaft 17b and the work 11 Thus, the feed force Fs of the work 11 multiplies the friction coefficient μ by the weight W of the work 11 and cos α. It will be. Here, the first rotating shaft 17a rotates at the peripheral speed UL, and the second rotating shaft 17b rotates at the peripheral speed UR. When the ratio between the peripheral speed UL and the peripheral speed UR changes, the friction coefficient Since μ changes, the feed force Fs of the workpiece 11 changes.

  The relationship shown in FIG. 5 is established between the peripheral speed ratio UL / UR, which is the ratio of the peripheral speed UL of the first rotary shaft 17a and the peripheral speed UR of the second rotary shaft 17b, and the feed force Fs of the workpiece 11. FIG. 5 is a graph showing the relationship between the feed force Fs of the workpiece 11 and the peripheral speed ratio UL / UR of the first and second rotating shafts 17a and 17b.

  Referring to FIG. 5, a first rotation shaft 17 a whose rotation direction is downward at the contact portion with work 11, and a second rotation shaft 17 b whose rotation direction is upward at the contact portion with work 11. When the value of the peripheral speed ratio UL / UR is reduced, the feed force of the workpiece 11 can be reduced (Fs1 in FIG. 5). That is, by reducing the rotation speed of the first rotation shaft 17a or increasing the rotation speed of the second rotation shaft 17b, the value of the peripheral speed ratio UL / UR is reduced and the feed force of the workpiece 11 is increased. Can be small. Conversely, when the value of the peripheral speed ratio UL / UR between the first rotating shaft 17a and the second rotating shaft 17b is increased, the feed force of the workpiece 11 can be increased (Fs2 in FIG. 5). That is, by increasing the rotation speed of the first rotation shaft 17a or decreasing the rotation speed of the second rotation shaft 17b, the value of the peripheral speed ratio UL / UR is increased and the feed force of the workpiece 11 is increased. Can be bigger.

  Thus, by setting the peripheral speed of the first rotating shaft 17a and the peripheral speed of the second rotating shaft 17b to be different, the peripheral speed of the first rotating shaft 17a and the second rotating shaft 17b The ratio of the peripheral speeds can be changed, and the feed force of the workpiece 11 can be adjusted.

  In this case, the first and second rotary shafts 17a and 17b can be easily and efficiently changed by changing the rotational speeds of the first and second rotary shafts 17a and 17b by the transmission motors 21a and 21b. Peripheral speed can be changed. Further, since the workpiece 11 can be easily changed during the grinding process, the feed force of the workpiece 11 can be easily adjusted.

  As described above, the feed force of the workpiece 11 can be easily adjusted by setting the peripheral speeds of the first and second rotating shafts 17a and 17b to different peripheral speeds. Therefore, since the accuracy of the cylindricity of the work 11 can be easily maintained and improved, the work 11 can be supplied efficiently.

  Further, the feed force of the workpiece 11 is also affected by the number of workpieces 11 placed in a row on the first and second rotary shafts 17a and 17b. Specifically, the feed force of the workpiece 11 can be increased as the number of the workpieces 11 placed on the first and second rotating shafts 17a and 17b increases. Here, the workpiece 11 placed on the first and second rotary shafts 17a and 17b is made different by increasing the feed force of the workpiece 11 by changing the peripheral speeds of the first and second rotary shafts 17a and 17b. Can reduce the quantity. If it does so, the length of the 1st and 2nd rotating shaft 17a, 17b can be comprised short, and size reduction of the workpiece | work supply apparatus 13 can be achieved.

  In the above embodiment, when the peripheral speeds of the first and second rotary shafts 17a and 17b are different from each other, the rotational speeds of the first and second rotary shafts 17a and 17b are changed. However, the present invention is not limited to this. For example, the peripheral speed may be changed by changing the diameter of the first rotary shaft 17a or the second rotary shaft 17b. For example, by changing the diameter of a pulley for driving a belt for rotating each rotary shaft, the number of rotations of the rotary shaft may be changed to have different peripheral speeds.

  Moreover, although the above-described speed change motors 21a and 21b are speed change motors using inverters, the present invention is not limited thereto, and may be other speed change motors.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The work supply apparatus and work supply method according to the present invention can efficiently supply a work and can easily maintain and improve the accuracy of the cylindricity of the work. When used effectively.

It is the schematic which shows the workpiece grinding apparatus containing the workpiece supply apparatus which concerns on one Embodiment of this invention. It is a schematic sectional drawing of the centerless grinding machine contained in the workpiece | work grinding apparatus shown in FIG. It is a schematic sectional drawing of the workpiece supply apparatus contained in the workpiece grinding apparatus shown in FIG. It is a schematic sectional drawing of a workpiece | work and a 1st and 2nd rotating shaft. It is a graph which shows the relationship between the peripheral speed ratio of a rotating shaft, and the feed force of a workpiece | work.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Work grinding apparatus, 11 Work, 12 Centerless grinding machine, 13 Work supply apparatus, 14 Grinding wheel, 15 Adjustment wheel, 16 Blade, 17a 1st rotating shaft, 17b 2nd rotating shaft, 18a, 18b Inlet guide plate , 19a, 19b Exit guide plate, 20 Work receiving portion, 21a, 21b Transmission motor.

Claims (6)

The first and second rotating shafts are disposed substantially parallel to the horizontal direction and inclined in the opposite directions in the vertical direction, and the first and second rotating shafts are rotated in the same direction, A workpiece supply device that pushes forward while rotating a plurality of workpieces placed in series on the first and second rotating shafts and supplies the workpiece to a centerless grinding machine,
The work supply apparatus, wherein the peripheral speed of the first rotary shaft is a peripheral speed different from the peripheral speed of the second rotary shaft. The workpiece supply device according to claim 1, wherein peripheral speeds of the first and second rotating shafts can be changed. The work supply apparatus according to claim 2, wherein the number of rotations of the first and second rotation shafts can be changed. The work supply apparatus according to claim 3, wherein the rotation speeds of the first and second rotating shafts are changed by a transmission motor using an inverter. Among the first and second rotating shafts, the peripheral speed of the first rotating shaft at which the rotating direction at the contact portion with the workpiece is downward is the second rotating speed at the rotating portion at the contacting portion with the workpiece is upward. The workpiece supply device according to claim 1, wherein the workpiece supply device is larger than a peripheral speed of the rotating shaft. The first and second rotating shafts are disposed substantially parallel to the horizontal direction and inclined in the opposite directions in the vertical direction, and the first and second rotating shafts are rotated in the same direction, A workpiece supply method for supplying a workpiece using a workpiece supply device that pushes forward while rotating a plurality of workpieces placed in series on the first and second rotating shafts and supplies the workpiece to a centerless grinding machine,
A work supply method, wherein a work is supplied by making the peripheral speed of the first rotary shaft different from the peripheral speed of the second rotary shaft.

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