JP6414353B1 - Film wrap processing equipment - Google Patents

Abstract

A film lapping apparatus capable of more efficiently polishing a ball groove of a screw shaft of a ball screw.
A representative configuration of a film wrap processing apparatus 100 according to the present invention is to rotate a screw shaft 104 in a film wrap processing apparatus 100 that polishes a ball groove 106 of a screw shaft 104 of a ball screw with a polishing film 102. A work holding unit 110 and a processing unit 112 that holds the polishing film 102 are provided. The processing unit 112 includes a holder that is recessed in an arc along the outer peripheral surface of the screw shaft 104, and a convex shape that is provided in the arc along the ball groove 106 in the holder and that is paired with the concave shape of the cross section of the ball groove 106. And a backup shoe that presses the polishing film 102 against the ball groove 106.
[Selection] Figure 1

Description

  The present invention relates to a film lapping apparatus for polishing a ball groove of a screw shaft of a ball screw with a polishing film.

  Film lapping is known as a polishing method for metal parts (for example, ball screws). Film wrapping is a polishing method performed using a polishing film having abrasive grains applied to the surface. As an old polishing method, a method using a grindstone or a buff (clothes) is known. However, when performing precise polishing, the grindstone is difficult to make uniform contact with the object to be processed and easily cracked and chipped. The buff is easy to contact because of its soft material, but the small polishing force is a bottleneck. If it is a film wrap process, the particle size of a polishing film, the backup material which presses a polishing film, etc. are selected suitably, and uniform and highly accurate grinding | polishing can be performed.

  Patent Document 1 discloses a groove processing apparatus for polishing a groove of a ball screw as film wrap processing. In this groove processing apparatus, the wrapping tape 35 is brought into contact with the groove 11 by the front end surface 30 a of the backup member 30 to process the groove 11.

Japanese Patent No. 4442011

  Currently, there is a demand for further improvement in the accuracy of the polishing process in the production site of precision parts. In polishing the screw shaft of a ball screw, there is a demand for polishing the ball groove more widely and uniformly.

  In view of such problems, an object of the present invention is to provide a film lapping apparatus capable of more efficiently polishing a ball groove of a screw shaft of a ball screw.

  In order to solve the above-described problems, a typical configuration of a film wrap processing apparatus according to the present invention is a film wrap processing apparatus for polishing a ball groove of a screw shaft of a ball screw with a polishing film. And a processing unit for holding a polishing film, the processing unit being provided in a circular arc shape along the ball groove on the holder, the holder recessed in an arc shape along the outer peripheral surface of the screw shaft, And a back-up shoe that protrudes into a convex shape that is paired with the concave shape of the cross section and presses the polishing film against the ball groove.

  According to the backup shoe, the polishing film can be brought into surface contact over a wide range of the ball groove. Therefore, according to the above configuration, the ball groove can be more efficiently and precisely polished.

  The backup shoe is preferably made of a soft material. With this configuration, the polishing film can be efficiently brought into surface contact with the ball groove.

  The workpiece holding unit may further include a workpiece moving mechanism that moves the screw shaft in the axial direction in synchronization with the rotation thereof. With this configuration, the entire screw shaft can be efficiently polished.

  The film lapping apparatus may further include a unit moving mechanism that moves the processing unit in the axial direction of the screw shaft in synchronization with the rotation of the screw shaft. This configuration also makes it possible to efficiently polish the entire screw shaft.

  The processing unit may further include a film delivery mechanism that feeds the polishing film onto the backup shoe. With this configuration, it is possible to perform wider and more efficient polishing using the entire backup shoe while appropriately moving the worn polishing film.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the film lapping apparatus which can grind | polish the ball groove of the screw shaft of a ball screw more efficiently.

It is the figure which showed the outline | summary of the film lapping apparatus which concerns on 1st Embodiment of this invention. It is the figure which showed the processing unit from each direction. It is an enlarged view of the head of a processing unit. It is an enlarged view of a backup shoe and a holder. It is the figure which expanded the main-body part of the processing unit widely. It is the figure which expanded and showed the workpiece holding part. It is the figure which showed the outline | summary of the film lapping apparatus which concerns on 2nd Embodiment of this invention. It is the figure which showed the film wrap processing apparatus of the modification concerning 1st Embodiment and 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same functions and configurations are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are illustrated or described. Is omitted.

(First embodiment)
FIG. 1 is a diagram showing an outline of a film wrap processing apparatus (hereinafter, processing apparatus 100) according to a first embodiment of the present invention. The processing apparatus 100 is a machine tool that uses a polishing film 102 to polish a ball groove 106 of a screw shaft 104 of a ball screw.

  The processing apparatus 100 is roughly based on a table 108, a work holding unit 110 that holds a screw shaft 104 that is an object to be processed (work), and a processing unit that holds a polishing film 102 and applies it to the screw shaft 104. 112. Note that the operations of the machining unit 112 and the workpiece holding unit 110 described below can be performed by computer control.

  FIG. 2 is a diagram showing the processing unit 112 from each direction. FIG. 2A shows the processing unit 112 from the same direction as FIG. The processing unit 112 is configured such that a main body 112 a having a head 114, a film delivery mechanism 116, and the like is provided on a base portion 112 b fixed to the table 108. A pressing mechanism 122 including an air cylinder 118 and a rail 120 is provided between the base portion 112b and the main body portion 112a. When processing the screw shaft 104, the main body 112 a is moved toward the screw shaft 104 by the pressing mechanism 122 so that the head 114 contacts the screw shaft 104.

  FIG. 2B is a view showing the processing unit 112 from the opposite side to FIG. A hinge 126 is provided as an inclination mechanism 124 between the base portion 112b and the main body portion 112a. The tilt mechanism 124 is a mechanism for changing the angle of a backup shoe 128 to be described later with respect to the screw shaft 104. As a part of the tilt mechanism 124, the hinge 126 changes the angle of the main body 112a with respect to the base 112b. By changing the angle of the main body 112 a by the hinge 126, the polishing film 102 can be accurately brought into contact with the ball groove 106 of the screw shaft 104.

  FIG. 3 is an enlarged view of the head 114 of the processing unit 112. The head 114 includes a backup shoe 128 at the tip and various frames and shafts that support the backup shoe 128.

  The backup shoe 128 is a protruding portion that presses the polishing film 102 against the screw shaft 104, and will be described in detail later with reference to FIG. The backup shoe 128 is connected to the tip frame 134 via the holder 130.

  The distal end frame 134 is connected to the intermediate frame 138 via a support shaft 136. The support shaft 136 is a shaft serving as a fulcrum for adjusting the angle of the front end frame 134, and changes the angle of the backup shoe 128 together with the front end frame 134. The support shaft 136 is also a part of the tilt mechanism 124 including the hinge 126 (see FIG. 2B) described above. The backup shoe 128 can be in a posture along the lead angle of the ball groove 106 of the screw shaft 104 under the control of the tilt mechanism 124 including the support shaft 136. This makes it possible to efficiently press the polishing film 102 against the ball groove 106 with high accuracy.

  The intermediate frame 138 is connected via a cylinder 142 to a main body frame 140 that widely forms the main body 112a. The cylinder 142 moves the head 114 beyond the intermediate frame 138 so that the backup shoe 128 contacts the screw shaft 104. The cylinder 142 is also a part of the pressing mechanism 122 including the air cylinder 118 (see FIG. 2A) described above. The backup shoe 128 can efficiently press the polishing film 102 against the ball groove 106 with high accuracy also by being controlled by the pressing mechanism 122 including the cylinder 142.

  FIG. 4 is an enlarged view of the backup shoe 128 and the holder 130. First, the holder 130 is a metal part for holding the backup shoe 128. The holder 130 has a curved surface 132 that is recessed in an arc along the outer peripheral surface of the screw shaft 104 on the side facing the screw shaft 104 (see FIG. 3).

  The backup shoe 128 is a component formed of a soft material (for example, urethane), and is fixed to the curved surface 132 of the holder 130 by adhesion or welding. The backup shoe 128 is also provided in an arc shape along the ball groove 106 of the screw shaft 104 (see FIG. 3), and protrudes from the curved surface 132 into a rounded shape.

  The ball groove 106 of the screw shaft 104 (see FIG. 3), which is an object to be polished by the processing apparatus 100, has a concave shape with a circular cross section that is recessed to allow the ball to pass therethrough. The backup shoe 128 protrudes in a rounded convex shape so as to be paired with the concave shape of the ball groove 106, and this shape makes it possible to efficiently press the polishing film 102 against the ball groove 106. Yes. At this time, since the backup shoe 128 is made of a soft material and has an appropriate elasticity, the polishing film 102 can be uniformly brought into surface contact over a wide range of the ball groove 106.

  FIG. 5 is an enlarged view of the main body 112 a of the processing unit 112. The film delivery mechanism 116 includes a supply spool 144 and a take-up spool 146 provided on the main body frame 140, and a plurality of pulleys 148. By the film delivery mechanism 116, the polishing film 102 is delivered from the supply spool 144 via the pulleys 148 onto the backup shoe 128 and taken up onto the take-up spool 146 as it is consumed. The processing unit 112 can efficiently polish the screw shaft 104 by appropriately moving the polishing film 102 consumed by the film delivery mechanism 116.

  In particular, the polishing film 102 is delivered from the film delivery mechanism 116 to the backup shoe 128 along the lead angle of the ball groove 106 of the screw shaft 104, that is, along the longitudinal direction of the backup shoe 128 in FIG. . With this configuration, the processing apparatus 100 can perform wide and efficient polishing of the ball groove 106 using the entire backup shoe 128.

  During polishing, that is, while the polishing film 102 is pressed against the ball groove 106 by the backup shoe 128, the polishing film 102 cannot be fed because the resistance between the backup shoe 128 and the polishing film 102 is large. As a basic operation, the same position of the polishing film 102 is polished from one end (start end) to the other end (end end) of one screw shaft 104. At this time, in order to make the polishing amount of the start end and the end end more uniform, after reaching the end end, the polishing film 102 and the backup shoe 128 are once separated from the screw shaft 104, and the polishing film 102 is sent out to make a new one. This can be dealt with by applying the range to the back-up shoe 128 and polishing again so as to return from the end to the start.

  FIG. 6 is an enlarged view of the work holding unit 110. The work holding unit 110 has a pair of head stock 110a and tail stock 110b, and holds the screw shaft 104 between the head stock 110a and the tail stock 110b.

  The work holding unit 110 includes a work rotation motor 152 in the head stock 110a as the rotation mechanism 150, and makes the machining unit 112 contact with the screw shaft 104 while rotating the screw shaft 104 in the circumferential direction. In addition to the work rotation motor 152, the rotation mechanism 150 includes a chuck 154 and a center 156 that rotate while gripping the screw shaft 104.

  The work holding unit 110 includes a work moving rail 160 provided on the table 108 and a moving motor (not shown) as the work moving mechanism 158. As a result, the head stock 110 a and the tail stock 110 b can move in the longitudinal direction (axial direction) of the screw shaft 104 along the workpiece moving rail 160. The movement by the workpiece moving mechanism 158 is performed in synchronization with the lead of the ball groove 106 of the screw shaft 104 in synchronization with the rotation of the screw shaft 104 by the rotating mechanism 150. By providing the workpiece moving mechanism 158, the entire screw shaft 104 can be efficiently polished.

  According to the configuration of the present embodiment, the screw shaft 104 is rotated and moved in the axial direction by the work holding unit 110, and the polishing film 102 is pressed against the ball groove 106 by the backup shoe 128 (see FIG. 4) of the processing unit 112. Thus, the ball groove 106 can be polished efficiently. In particular, since the backup shoe 128 is made of a resin and has a structure that continuously protrudes in an arc shape, the polishing film is brought into wide and uniform surface contact with the ball groove, thereby effectively reducing the surface roughness of the ball groove 106. Can be improved. Therefore, according to this embodiment, the screw shaft 104 can be polished and finished with high accuracy, and it is possible to extend the life of the ball screw and reduce noise.

(Second Embodiment)
FIG. 7 is a diagram showing an outline of a film wrap processing apparatus (hereinafter, processing apparatus 200) according to the second embodiment of the present invention. In the following description, components that have already been described are denoted by the same reference numerals and description thereof is omitted. In addition, components having the same names as the components already described have the same configuration and function even if different reference numerals are given.

  Unlike the processing apparatus 100 shown in FIG. 1 or the like, the processing apparatus 200 is configured such that the processing unit 112, not the work holding unit 110, moves in the axial direction of the screw shaft 104. Specifically, the processing apparatus 200 includes a unit moving rail 204 provided on the table 108 and a moving motor (not shown) as the unit moving mechanism 202. As a result, the machining unit 112 can move in the axial direction of the screw shaft 104 along the unit moving rail 204. The movement of the machining unit 112 at this time is also performed in synchronization with the lead of the ball groove 106 of the screw shaft 104 in synchronization with the rotation of the screw shaft 104 by the rotation mechanism 150 of the workpiece holding unit 110.

  Thus, even in the processing apparatus 200, the entire screw shaft 104 can be efficiently polished using the unit moving mechanism 202. In particular, the unit moving rail 204 can be shorter than the work moving rail 160 (see FIG. 1) for moving the head stock 110a and the tail stock 110b at both ends of the screw shaft 104, so that the overall configuration of the processing apparatus 200 can be reduced in size. Can be useful.

(Modification)
FIG. 8 is a view showing a film wrap processing apparatus (hereinafter, processing apparatus 300) of a modification according to the first embodiment and the second embodiment. A processing apparatus 300 is shown as a modification of the processing apparatus 100 on behalf of the processing apparatus 100 of the first embodiment and the processing apparatus 200 of the second embodiment.

  In the processing apparatus 300, a plurality of processing units 112, a total of four, are provided (the processing unit 112 and the other processing units 302a to 302c). The processing units 302 a to 302 c have the same configuration as the processing unit 112 except that the installation directions are different. Specifically, a machining unit 302a is provided on the opposite side of the screw shaft 104 of the machining unit 112, and a machining unit 302c is provided on the opposite side of the screw shaft 104 of the machining unit 302b.

  Moreover, in the processing apparatus 300, it is also possible to vary the kind of the abrasive film 102 used for each processing unit. For example, by gradually reducing the abrasive film of each processing unit from the upper side to the lower side of the workpiece moving mechanism 158, it is possible to perform roughing to finishing in one operation. Polishing by the plurality of processing units 112, 302a to 302c can also be performed by the processing apparatus 200 of the second embodiment. In addition, a plurality of processing units can be provided, and these configurations enable the screw shaft 104 to be efficiently and precisely sharpened.

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used for a film lapping apparatus that polishes a ball groove of a screw shaft of a ball screw with a polishing film.

DESCRIPTION OF SYMBOLS 100 ... Processing apparatus of 1st Embodiment, 102 ... Polishing film, 104 ... Screw shaft, 106 ... Ball groove, 108 ... Table, 110 ... Work holding part, 110a ... Head stock, 110b ... Tail stock, 112 ... Processing unit, DESCRIPTION OF SYMBOLS 112a ... Main-body part, 112b ... Base part, 114 ... Head, 116 ... Film delivery mechanism, 118 ... Air cylinder, 120 ... Rail, 122 ... Pressing mechanism, 124 ... Inclination mechanism, 126 ... Hinge, 128 ... Backup shoe, 130 ... Holder, 132 ... curved surface, 134 ... tip frame, 136 ... support shaft, 138 ... intermediate frame, 140 ... body frame, 142 ... cylinder, 144 ... supply spool, 146 ... take-up spool, 148 ... pulley, 150 ... rotating mechanism, 152 ... Work rotating motor, 154 ... Chuck, 156 ... Center, 58 ... workpiece moving mechanism, 160 ... work moving rail 200 ... processing apparatus according to the second embodiment, 202 ... unit moving mechanism, 204 ... unit moving rail 300 ... processing device of Modification, 302a ... other processing units

Claims (5)

In a film wrap processing apparatus for polishing a ball groove of a screw shaft of a ball screw with a polishing film,
A work holding part for rotating the screw shaft;
A processing unit for holding the abrasive film;
With
The processing unit is
A holder facing the screw shaft with a curved surface recessed in an arc shape along the outer peripheral surface of the screw shaft ;
The curved surface of the holder that is recessed in an arc shape is provided along the ball groove, and protrudes in a rounded shape from the curved surface so as to be paired with the concave shape of the cross section of the ball groove. A backup shoe that presses against the ball groove,
A film lapping apparatus characterized by comprising:   The film lapping apparatus according to claim 1, wherein the backup shoe is made of a soft material.   The film wrap processing apparatus according to claim 1, wherein the work holding unit further includes a work moving mechanism that moves the screw shaft in the axial direction in synchronization with the rotation thereof.   The film wrap processing apparatus according to claim 1, further comprising a unit moving mechanism that moves the processing unit in an axial direction of the screw shaft in synchronization with rotation of the screw shaft. Processing equipment. 5. The film wrap processing apparatus according to claim 1, wherein the processing unit further includes a film delivery mechanism that feeds the polishing film onto the backup shoe.

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