JP2005199409A - Precise finishing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple precise finishing device capable of simply changing processing conditions of abrasive size at small quantity production of various kinds, and precisely finishing workpieces of both large diameter and small diameter. <P>SOLUTION: This precise finishing device holds a hollow or solid cylindrical workpiece so as to be rotated, brings a belt-like polishing tape into slide-contact with an outer periphery of the workpiece, and performs wrap processing and polish processing. The device comprises a polish tape 16 affixed to abrasives, a pressurizing means 19 for pressing the polish tape to the workpiece, a polish tape supply means 17 for sequentially supplying the polish tape between the pressurizing means and the outer periphery of the workpiece, and a holding means for holding the workpiece while rotating and feeding it in a direction of a rotational shaft. The holding means has a blade 14 supporting a lower part of the workpiece, and a regulating wheel 13 supporting the workpiece while rotating at a predetermined speed. The regulating wheel is installed to the workpiece on the opposite side of the pressurizing means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a precision finishing apparatus for lapping and polishing hollow and solid cylindrical workpieces with an abrasive tape.

  Conventionally, as shown in FIG. 4, a hollow and solid cylindrical workpiece 15 is rotated by a blade 14 and an adjusting wheel 13 that rotates at a set rotational speed, and at the same time, the direction of the axis of rotation of the workpiece 15 There is a centerless lapping machine as a precision finishing device that performs lapping with a lapping wheel 30 made of cast iron or a grindstone that is held while being fed to the wheel. The centerless lapping machine is an excellent and unique processing method for lapping in this way.

  Further, as shown in FIG. 5, the workpiece 15 is rotated by the two rotating rollers 40 and simultaneously supported while being fed in the direction of the axis of rotation of the workpiece 15. There is also a proposal of a finishing method for precision finishing by pressing to the object 15 and targeting an aluminum photosensitive drum. (For example, see Patent Document 1)

Japanese Patent Laid-Open No. 8-1502 (page 4-5, FIG. 1)

  However, in the case of the centerless lapping machine shown in FIG. 4, the lapping wheel 30 is generally made of a grindstone or cast iron. For this reason, labor is required for production and handling of the lapping wheel 30, and there is an inconvenience that the processing conditions such as the abrasive grain size cannot be easily changed when used for multi-product small-volume production. In addition, the price of the lap car 30 is also expensive.

  In the case of the aluminum pipe finishing method shown in FIG. 5, the workpiece 15 is supported by two rotating rollers 40. Therefore, in the case of the workpiece 15 having a small diameter, as shown in FIG. The object 15 enters the vicinity of the position indicated by the straight line 41 connecting the centers of the two rotating rollers 40, and as a result, the pressure roller 20 reaches the vicinity of the position indicated by the straight line 41 connecting the centers of the two rotating rollers 40. You have to get in. At this time, it is necessary to prevent the pressure roller 20 from coming into contact with the rotating roller 40, and the diameter of the pressure roller 20 is also required to be reduced. However, since there is a limit to reducing the diameter of the pressure roller 20, there is a disadvantage that it cannot be used when the diameter of the workpiece is extremely small.

  The present invention has been made in view of the above problems, and it is possible to easily change the processing conditions such as the abrasive grain size in a variety of small-quantity production, etc., and to precisely finish a workpiece from a small diameter to a large diameter. An object of the present invention is to provide a precise finishing device that is possible and simple.

  In order to achieve the above-mentioned object, the present invention holds a hollow or solid cylindrical workpiece rotatably, and slidably contacts a belt-like polishing tape on the outer peripheral surface of the workpiece to perform lapping or polishing. In a precision finishing apparatus to be performed, a polishing tape to which abrasive grains are fixed, a pressing means for pressing the polishing tape against a workpiece, and the polishing tape are sequentially supplied between the pressing means and the outer peripheral surface of the workpiece. And a holding means for holding the workpiece while rotating the workpiece and feeding it in the direction of the rotation axis, the holding means rotating at a predetermined rotation speed with a blade for supporting the lower side of the workpiece. And an adjusting wheel for supporting the workpiece, wherein the adjusting wheel is provided on the opposite side of the pressurizing means with respect to the workpiece.

  Moreover, it has a plurality of polishing tapes with different abrasive grain sizes to be fixed, and a plurality of polishing tapes are rough-finished in which abrasive grains having a large grain size are fixed in the feed direction in the rotation axis direction of the workpiece. A polishing tape for finishing and a polishing tape for finishing, to which abrasive grains having a small particle size are fixed, are installed in this order.

  Further, the pressurizing means has an elastic member having elasticity such as rubber or plastic at a portion contacting the workpiece via the polishing tape.

  In addition, a first contact position where the workpiece and the adjustment wheel contact each other, a second contact position where the workpiece and the pressurizing means contact each other, and a third contact position where the workpiece and the blade contact each other. And the third contact position is set so that the rotation center position of the workpiece is located below the straight line connecting the first contact position and the second contact position.

  Since the precision finishing apparatus of the present invention uses a polishing tape to which abrasive grains are fixed, the processing conditions such as the abrasive grain diameter can be easily changed. In addition, the polishing tape is inexpensive and can provide a precision finishing device that can flexibly cope with a wide variety of low-volume production.

  In addition, the rotational stability of the workpiece can be kept good, and rough finishing, intermediate finishing, and top finishing can be performed continuously. Furthermore, it is possible to prevent the workpiece from jumping upward, and in particular, even for small-diameter workpieces, there is a large degree of freedom in the geometric arrangement of the pressurizing means and practical precision finishing can be performed. . Therefore, it is possible to provide a precision finishing device that is easy to handle and capable of precision finishing from a large diameter workpiece to a small diameter workpiece.

  In addition, it is possible to provide a precision finishing apparatus that can average the pressing pressure of the polishing tape against the workpiece and can absorb the local variation of the abrasive grains of the polishing tape to perform high-quality finishing.

  Preferred embodiments of the precision finishing apparatus of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing a precision finishing apparatus according to a first embodiment of the present invention. FIG. 2 is a schematic view of the precision finishing apparatus of the present invention as viewed from above. A precision finishing apparatus according to Example 1 of the present invention will be described with reference to FIG.
The precision finishing apparatus according to the present embodiment includes a strip-shaped polishing tape 16 to which abrasive grains are fixed and a metal material as a pressurizing means for pressing the polishing tape 16 against a hollow or solid cylindrical workpiece 15. The pressure roller 20, the polishing tape supply means for sequentially supplying the polishing tape 16 between the pressure roller 20 and the outer peripheral surface of the workpiece 15, and the workpiece 15 are rotated and held while being fed in the direction of the rotation axis. Holding means. Further, the holding means includes a blade 14 that supports a lower portion of the workpiece 15, and an adjustment wheel 13 that supports the workpiece 15 while rotating at a predetermined rotation speed. The adjustment wheel 13 is attached to the workpiece 15. It is characterized in that the workpiece 15 is rotatably held by being disposed so as to be positioned on the opposite side of the pressure roller 20, and the lapping process or the polishing process is performed by sliding the polishing tape on the outer peripheral surface of the workpiece 15. Yes.

The blade 14 is fixed on the base 10 so as to be in contact with the lower part of the workpiece 15 and to have a set support height for the workpiece 15. The part of the blade 14 that comes into contact with the workpiece 15 is made of a member having good wear resistance such as cemented carbide, and a set blade apex angle 14a is provided on a polished smooth surface. The blade apex angle 14a improves the rotational stability of the workpiece 15 as the angle becomes sharper. However, if the blade apex angle 14a becomes too acute, the rigidity of the blade is lowered.

  The adjustment wheel 13 is made of a material having a large frictional force such as rubber, and is disposed on the opposite side of the work piece 15 from the pressure roller 20, and is supported on the adjustment wheel support turning portion 12 so that the rotating shaft of the adjustment wheel 13 can rotate. Has been. The adjustment wheel 13 is rotated at a rotation speed set by a drive motor (not shown).

  The adjustment vehicle support turning portion 12 is held so as to be able to turn around an axis 11a perpendicular to the adjustment vehicle base 11 fixed on the base 10, and can be fixed with a set turning angle. . For this reason, the adjustment wheel 13 supported by the adjustment wheel support turning part 12 is fixed with the turning angle set around the axis 11 a perpendicular to the adjustment wheel base 11 fixed on the base 10. Is done. At this time, the surface shape of the outer periphery of the adjustment wheel 13 is a surface that is trued to be performed by a general centerless grinding machine tooling device (not shown). It has a drum shape in which the outer diameter continuously decreases toward the center. Even when the adjustment wheel 13 is provided with a predetermined turning angle, it is shaped so as to be in line contact with the workpiece 15.

  The work piece 15 is supported by the blade 14 and the adjustment wheel 13 so as to be rotatable and movable in the direction of the rotation axis of the work piece 15. The work piece 15 is rotated by the friction force of the adjustment wheel. 15 is rotated. At this time, since the rotating shaft of the adjusting wheel 13 has a turning angle with respect to the rotating shaft of the workpiece 15, the workpiece 15 has a velocity component in the feed direction. Accordingly, when the turning angle of the adjusting wheel 13 is increased, the speed in the feed direction of the workpiece 15 is increased. Conversely, when the turning angle is decreased, the speed in the feed direction of the workpiece 15 is decreased.

  As the polishing tape 16, a tape in which abrasive grains are fixed to a polyester tape with a synthetic adhesive, or a cloth tape containing an abrasive is used. Further, a supply roller 17 and a take-up roller 18 are provided as polishing tape supply means for sequentially supplying the polishing tape 16. Further, a brake mechanism (not shown) is attached to the supply roller 17 so as not to cause a processing failure due to slack of the polishing tape 16 or uneven feeding, and a take-up motor having a take-up drive motor (not shown). By forcibly winding the polishing tape 16 with the roller 18, a constant tension is always applied to the polishing tape 16 so as to run at a predetermined speed.

The traveling polishing tape 16 is brought into pressure contact with the workpiece 15 by the pressure set by the processing pressure setting unit 19 by the pressure roller 20, and is simultaneously sent to the workpiece rotation axis direction as the workpiece 15 rotates. Thus, lapping or polishing is performed.
Further, the work 15 also generates a frictional force between the polishing tape 16 and the work 15, but the work 15 is controlled by a larger frictional force with the adjusting wheel 13, so Rotates at high speed.

As described above, according to the present embodiment, abrasive grains such as a polishing tape in which abrasive grains are fixed to a polyester tape as a polishing tape 16 with a synthetic adhesive, and a polishing tape in which an abrasive is included in a cloth tape are provided. Since the fixed polishing tape is used, the processing conditions such as the abrasive grain size can be easily changed, which is effective for the production of a variety of products in small quantities.
Further, the workpiece 15 is held while being fed in the direction of the axis of rotation of the workpiece 15 while being rotated by the blade 14 and the adjusting wheel 13 having a large friction coefficient that rotates at the set rotation speed. On the other hand, the degree of freedom in geometrical arrangement of the pressure roller 20 is large, and a precision finishing process can be practically performed.

Next, the precision finishing apparatus in Example 2 of this invention is demonstrated, referring FIG. 1 and FIG. FIG. 2 is a schematic diagram showing the configuration of the precision finishing apparatus according to the second embodiment of the present invention. The same parts and members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In this embodiment, a plurality of polishing tapes are installed in the feed direction of the workpiece 15 as shown in FIG. 2. In this example, the processing order is rough polishing tape 16a, intermediate polishing. The tape 16b and the finishing tape 16c are arranged in this order.

  According to the present embodiment, the workpiece 15 is sent in the rotation axis direction of the workpiece 15 at the same time as being rotated. For this reason, the workpiece 15 is first processed with the rough finishing polishing tape 16a, then processed with the intermediate finishing polishing tape 16b, and finally processed with the upper finishing polishing tape 16c. In this way, it is processed sequentially from rough finishing to top finishing, so once through the processing steps of this precision finishing device, rough finishing, intermediate finishing and top finishing in lapping or polishing are performed continuously. Can do.

  Next, the precision finishing apparatus in Example 3 of this invention is demonstrated, referring FIG. 1 and FIG. The same parts and members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this embodiment, the material of the pressure roller 20 shown in FIGS. 1 and 2 is made of rubber or plastic, and has an elastic structure.

  According to the present embodiment, the pressing pressure of the polishing tape 16 against the workpiece 15 is averaged, and even when the abrasive grains of the polishing tape 16 vary locally, the pressure roller 20 provides elasticity such as rubber or plastic. Since it is comprised with the material which has, an abrasive grain does not dig deeply into the workpiece 15 locally. For this reason, finishing with good quality can be performed.

Next, the precision finishing apparatus in Example 4 of this invention is demonstrated, referring FIG. The same parts and members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The precision finishing apparatus in the present embodiment is an example that is particularly effective when the workpiece is small in diameter and has a poor rotational stability such as a long length. As shown in FIG. 3, the workpiece rotation center 15 a includes a first contact position 15 b where the workpiece 15 and the adjustment wheel 13 contact each other, and a second contact position 15 c where the workpiece 15 and the pressure roller 20 contact each other. A third contact position 15d where the workpiece 15 and the blade 14 are in contact with each other is set so as to be positioned below the straight line 15e connecting the two. Lapping or polishing is performed under the conditions of this geometric arrangement.

  According to the present embodiment, it is possible to prevent the workpiece 15 from jumping upward even when the workpiece is small in diameter and has a long rotational stability or the like.

  Although preferred embodiments of the present invention have been described, the present invention is not limited to the above description. For example, in the above-described embodiment, the example in which the rotating pressure roller is used as the pressing means of the polishing tape has been described. However, a non-rotating pressure platen may be used.

It is a figure concerning Example 1 of the precision finishing apparatus of this invention. It is the figure seen from the upper direction of the precision finishing apparatus of this invention, and is a figure concerning Example 2. FIG. It is a figure concerning Example 4 of the precision finishing apparatus of this invention. It is a figure explaining the conventional heartless lapping machine. It is a figure explaining the conventional precision finishing apparatus. It is a figure explaining the conventional precision finishing apparatus.

Explanation of symbols

10 base
DESCRIPTION OF SYMBOLS 11 Adjustment vehicle base 11a Shaft perpendicular | vertical to adjustment vehicle base 12 Adjustment vehicle support turning part 13 Adjustment wheel 14 Blade 14a Blade vertex angle 15 Workpiece 15a Workpiece rotation center 15b 1st contact position 15c 2nd contact position 15d Third contact position 15e A straight line 16 connecting the first contact position and the second contact position. Polishing tape 16a Rough finishing polishing tape 16b Intermediate finishing polishing tape 16c Finishing polishing tape 17 Supply roller 18 Winding roller 19 Pressure setting unit 20 Pressure roller 30 Lapping wheel 40 Rotating roller 41 A straight line connecting the centers of two rotating rollers

Claims (4)

In a precision finishing apparatus for holding a hollow or solid cylindrical workpiece rotatably and performing a lapping process or a polishing process by sliding a strip-shaped polishing tape on the outer peripheral surface of the workpiece,
Polishing tape with abrasive grains fixed thereto, pressing means for pressing the polishing tape against the workpiece, and polishing for sequentially supplying the polishing tape between the pressing means and the outer peripheral surface of the workpiece Tape supply means and holding means for rotating and holding the workpiece while feeding it in the direction of the rotation axis, the holding means supporting the lower part of the workpiece and a workpiece while rotating at a predetermined rotation speed. A precision finishing apparatus, comprising: an adjusting wheel for supporting an object, wherein the adjusting wheel is provided on a side opposite to the pressurizing unit with respect to the workpiece.   A rough finish in which a plurality of polishing tapes having different grain sizes of the abrasive grains to be fixed are provided, and the abrasive grains having a large grain size are fixed to the feed direction in the rotation axis direction of the workpiece. 2. The precision finishing apparatus according to claim 1, wherein the precision finishing device is installed in the order of a polishing tape for finishing and having abrasive grains having a small particle size fixed thereto.   2. The precision finishing apparatus according to claim 1, wherein the pressurizing means includes an elastic member having elasticity such as rubber or plastic at a portion in contact with the workpiece via the polishing tape.   A first contact position where the workpiece and the adjusting wheel contact each other; a second contact position where the workpiece and the pressurizing means contact; and a third contact position where the workpiece and the blade contact each other. The third contact position is set so that the rotation center position of the workpiece is positioned below a straight line connecting the first contact position and the second contact position. The precision finishing apparatus according to claim 1, wherein:

Images