Film wrap processing equipment

Abstract

To provide a film lapping processing device and a film lapping processing method that are capable of polishing a screw groove in a work of a screw shape with high accuracy.SOLUTION: A film lapping processing device 100 is a film lapping processing device for polishing a workpiece 102 of a screw shape with a polishing film 104, and includes: backup shoes 128, 130 for energizing the polishing film to a screw groove 106 in the workpiece; and shoe rotation mechanisms 132, 134 for matching a rotation angle of the backup shoes to a lead angle of the screw groove in the work by rotating the backup shoes. The show rotation mechanism rotationally vibrates the backup shoes during polishing of the screw groove.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a film lapping device and a film lapping method for lapping a threaded workpiece with a lapping film. [Background technology]

[0002] Film lapping is a known method for polishing metal workpieces. Film lapping is a polishing method using a polishing film with abrasive grains applied to its surface. For example, Patent Document 1 discloses a film lapping device for polishing the ball grooves of a ball screw screw shaft with a polishing film.

[0003] The film lapping device of Patent Document 1 includes a processing unit that holds an abrasive film. The processing unit has a holder and a backup shoe. The holder is recessed in an arc along the outer circumferential surface of the screw shaft. The backup shoe is provided in an arc along the ball groove on the holder, and protrudes in a convex shape that matches the concave shape of the cross section of the ball groove, pressing the abrasive film against the ball groove.

[0004] Patent document 1 states that the processing unit that holds the polishing film has a holder and a backup shoe, which allows the polishing film to come into surface contact with a wide area of ​​the ball groove, making it possible to perform more efficient and precise polishing of the ball groove. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-171487 Summary of the Invention [Problem to be solved by the invention]

[0006] In the film wrapping device of Patent Document 1, the workpiece is a ball screw, and the cross-sectional shape of the screw groove is arc-shaped (semicircular), so by pressing the backup shoe against it, it was possible to polish the entire surface of the screw groove.

[0007] However, when the workpiece is threaded, the cross-sectional shape of the thread groove is nearly rectangular (rounded square), so pressure is not applied to the side of the thread groove (the tooth surface of the thread), which can result in insufficient polishing. Therefore, there is a demand for polishing the thread groove of a threaded workpiece with higher precision.

[0008] In view of the above problems, the present invention aims to provide a film lapping device and a film lapping method that are capable of polishing the thread grooves of a threaded workpiece with high precision. [Means for solving the problem]

[0009] In order to solve the above problems, a typical configuration of the film lapping device of the present invention is a film lapping device that polishes a thread-shaped workpiece with a polishing film, and is equipped with a backup shoe that forces the polishing film against the thread groove of the workpiece, and a shoe rotation mechanism that rotates the backup shoe to match the rotation angle of the backup shoe to the lead angle of the thread groove of the workpiece, and is characterized in that the shoe rotation mechanism rotates and vibrates the backup shoe while the thread groove is being polished.

[0010] In the above configuration, the backup shoe that presses the polishing film against the thread groove of the workpiece is rotated by a shoe rotation mechanism, and the rotation angle of the backup shoe is adjusted to match the lead angle of the thread groove of the workpiece, causing the backup shoe to rotate and oscillate while the thread groove is being polished. In other words, in the above configuration, when polishing the thread groove of the workpiece with a polishing film, the rotation angle of the backup shoe is adjusted to match the lead angle of the thread groove of the workpiece, and the backup shoe is pressed against the thread groove (thread root), and the backup shoe is also rotated and oscillated while the thread groove is being polished. This allows the side surface of the thread groove (the tooth surface of the screw) to be polished as well, making it possible to polish the thread groove of a thread-shaped workpiece with high precision.

[0011] It is preferable to further provide a backup shoe shift mechanism that adjusts the position of the backup shoe in accordance with the lead of the workpiece.

[0012] This makes it possible to adjust the position at which the backup shoe presses against the thread groove of the workpiece in accordance with the lead of the workpiece.

[0013] The backup shoes described above are preferably made up of a pair, and may further include a pair of arms to which the pair of backup shoes are attached and which sandwich the workpiece and urge each of the pair of backup shoes against the workpiece, a cylinder for opening and closing the pair of arms, and a pair of shoe rotation mechanisms for rotating each of the pair of backup shoes.

[0014] As a result, the pair of shoe rotating mechanisms adjust the rotation angles of the pair of backup shoes to the lead angle of the workpiece's thread groove, and the cylinder closes the pair of arms, allowing the workpiece to be sandwiched, for example, from above and below, and the pair of backup shoes to be pressed against the workpiece's thread groove. Furthermore, while the thread groove is being polished, the pair of shoe rotating mechanisms can rotate and vibrate the pair of backup shoes while the workpiece is sandwiched between them. Therefore, the thread groove of the workpiece can be polished with high precision while the workpiece is sandwiched between the pair of backup shoes.

[0015] In order to solve the above problems, a typical configuration of the film lapping method of the present invention is a film lapping method for polishing a threaded workpiece with a polishing film, characterized in that a backup shoe is rotated, the rotation angle of the backup shoe is adjusted to match the lead angle of the thread groove of the workpiece, the backup shoe is forced against the thread groove via the polishing film, and the backup shoe is rotationally vibrated while the thread groove is polished.

[0016] The components and their explanations corresponding to the technical concept of the above-mentioned film wrapping device can also be applied to this method. That is, in the above-mentioned configuration, the rotation angle of the backup shoe is adjusted to match the lead angle of the thread groove of the workpiece, the backup shoe is pressed against the thread groove (thread root), and the backup shoe is rotationally vibrated while the thread groove is being polished. This makes it possible to polish the side surface of the thread groove (the thread tooth surface), and to polish the thread groove of a thread-shaped workpiece with high precision. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a film lapping device and a film lapping method that are capable of polishing the thread groove of a threaded workpiece with high precision. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a diagram showing a film wrap processing device according to an embodiment of the present invention. [Figure 2] 2 is a diagram showing a state in which a workpiece is being polished by the film lapping device of FIG. 1. FIG. [Figure 3] 3 is an enlarged view of the main part of the film wrap processing device of FIG. 2 as viewed from another direction. [Figure 4] 4 is a diagram showing a state of a backup shoe during polishing of the film lapping device of FIG. 3.

[0023] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Dimensions, materials, and other specific values ​​shown in the embodiments are merely examples for facilitating understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown.

[0020] Fig. 1 is a diagram showing a film lapping apparatus (hereinafter referred to as processing apparatus 100) according to an embodiment of the present invention. Fig. 2 is a diagram showing a state in which a workpiece 102 is being polished by the processing apparatus 100 of Fig. 1.

[0021] The processing apparatus 100 is a machine tool that uses an abrasive film 104 to polish a thread groove 106 of a thread-shaped workpiece 102, which is an object to be processed shown in Fig. 2. The operation of the processing apparatus 100 described below can be controlled by a computer.

[0022] The processing device 100 includes a main body 108, a pair of arms 110, 112, and a cylinder 114 that opens and closes the pair of arms 110, 112. The pair of arms 110, 112 are rotatably supported by a predetermined opening and closing shaft of the main body 108.

[0023] The cylinder 114 opens the pair of arms 110, 112 by pulling the tails 116, 118 of the pair of arms 110, 112 together as shown in Figure 1. The cylinder 114 also closes the pair of arms 110, 112 by moving the tails 116, 118 apart as shown in Figure 2.

[0024] The processing apparatus 100 further includes a pair of support bases 120, 122, a pair of shoe units 124, 126, a pair of backup shoes 128, 130, and a pair of shoe rotating mechanisms 132, 134. The support base 120 is attached to a plate 135. The plate 135 is disposed parallel to the arm 110 (see FIG. 3), and the distance from the tip end 110a of the arm 110 can be adjusted by controlling a backup shoe shift mechanism 137 fixed to the tip end 110a of the arm 110. The support base 122 is attached to the tip end 112a of the arm 112.

[0025] The pair of shoe units 124, 126 are connected to and supported by the pair of support bases 120, 122 via a pair of support shafts 136, 138, which are part of the pair of shoe pivoting mechanisms 132, 134. A pair of backup shoes 128, 130 are attached to the pair of shoe units 124, 126. The pair of support shafts 136, 138 are shafts that serve as fulcrums for adjusting the angle of the pair of shoe units 124, 126, and change the angle of the pair of backup shoes 128, 130 together with the pair of shoe units 124, 126 (described below).

[0026] The pair of backup shoes 128, 130 are blocks made of a soft material (e.g., urethane) and urge the polishing film 104 onto the thread groove 106 of the workpiece 102. The polishing film 104 is fed onto the pair of backup shoes 128, 130 from a reel 140 via film guide rollers 142, and as the film wears out, it is taken up by a take-up roller 144. In the processing apparatus 100, by appropriately moving the worn polishing film 104, it is possible to efficiently polish the thread groove 106 of the workpiece 102.

[0027] The pair of shoe rotating mechanisms 132, 134 are servo motors fixed to the pair of support bases 120, 122, and include a pair of support shafts 136, 138. The pair of shoe rotating mechanisms 132, 134 rotate the pair of backup shoes 128, 130 together with the pair of shoe units 124, 126 via the pair of support shafts 136, 138.

[0028] The pair of shoe rotating mechanisms 132, 134 then align the rotation angle of the pair of backup shoes 128, 130 with the lead angle of the thread groove 106 of the workpiece 102. In other words, the pair of backup shoes 128, 130 are controlled by the pair of shoe rotating mechanisms 132, 134, which include a pair of support shafts 136, 138, and can assume a position that is aligned with the lead angle of the thread groove 106 of the workpiece 102.

[0029] Furthermore, when the pair of arms 110, 112 are closed by a cylinder 114 as shown in FIG. 2, the pair of backup shoes 128, 130 can be biased against the workpiece 102, for example, by sandwiching the workpiece 102 from above and below.

[0030] As a result, in the processing device 100, the pair of shoe rotation mechanisms 132, 134 can be used to adjust the rotation angles of the pair of backup shoes 128, 130 to the lead angle of the thread groove 106 of the workpiece 102, and then the pair of arms 110, 112 can be closed to press the pair of backup shoes 128, 130 against the thread groove 106 of the workpiece 102.

[0031] Here, because the workpiece 102 has a threaded shape, the cross-sectional shape of the thread groove 106 is approximately rectangular (rounded square) (see FIG. 4(b)). For this reason, simply matching the rotation angle of the pair of backup shoes 128, 130 to the lead angle of the thread groove 106 of the workpiece 102 and pressing the pair of backup shoes 128, 130 against the thread bottom 146 of the thread groove 106 shown in FIG. 4(b) may not apply pressure to the side surface 148 of the thread groove 106, i.e., the tooth surface of the thread, which may result in insufficient polishing.

[0032] Therefore, the processing device 100 performs control such that the pair of shoe rotating mechanisms 132, 134 rotate and oscillate the pair of backup shoes 128, 130 while the thread groove 106 is being polished.

[0033] Fig. 3 is an enlarged view of the main parts of the processing apparatus 100 of Fig. 2, viewed from a different direction. For ease of explanation, the polishing film 104 has been omitted from the drawing. Fig. 4 is a view showing the state of the backup shoe 128 during polishing by the processing apparatus 100 of Fig. 3. Fig. 4(a) is a view showing the state in which the backup shoe 128 is pressed against the thread groove 106 of the workpiece 102. Fig. 4(b) is a cross-sectional view taken along line AA of Fig. 4(a).

[0034] Before polishing the thread groove 106 of the thread-shaped workpiece 102, the processing device 100 rotates the pair of backup shoes 128, 130 using the pair of shoe rotating mechanisms 132, 134 to adjust the rotation angles of the pair of backup shoes 128, 130 to the lead angle of the thread groove 106 of the workpiece 102. Furthermore, by closing the pair of arms 110, 112, the pair of backup shoes 128, 130 are pressed against the thread groove 106 of the workpiece 102 via the polishing film 104.

[0035] At this time, the backup shoe 128 is pressed against the thread groove 106 of the workpiece 102 from above, as shown in Figure 3. Meanwhile, the backup shoe 130 is pressed against the thread groove 106 of the workpiece 102 from below. The threaded workpiece 102 has a lead angle that is opposite when viewed from above and when viewed from below. Therefore, the pair of backup shoes 128, 130 rotate in opposite directions around a pair of support shafts 136, 138 (see Figure 2) of a pair of shoe rotating mechanisms 132, 134.

[0036] In this way, the processing device 100 can securely press the pair of backup shoes 128, 130 against the thread bottom 146 (see FIG. 4(b)) of the thread groove 106 of the workpiece 102 with the workpiece 102 sandwiched between them.

[0037] Furthermore, in the processing apparatus 100, as shown by arrows B and C in Fig. 4(a), the shoe rotation mechanism 132 rotates and vibrates the backup shoe 128 while the thread groove 106 is being polished. As a result, as shown in Fig. 4(b), in addition to pressing the backup shoe 128 against the thread root 146 of the thread groove 106, the side surface 148 of the thread groove 106 can also be polished by rotationally vibrating the backup shoe 128 while polishing the thread groove 106. Here, rotational vibration refers to a movement in which the backup shoe 128 swings like a pendulum around the center line D in the longitudinal direction of the thread root 146 of the thread groove 106, bringing the backup shoe 128 into contact with the side surface 148 of the thread groove 106.

[0038] 4(b), the polishing film 104 has a width sufficient to cover the thread root 146 and side surfaces 148 of the thread groove 106, and is urged against the thread groove 106 by the backup shoe 128, thereby ensuring that the thread groove 106 is polished. Note that the backup shoe 130 is also rotationally vibrated by the shoe rotation mechanism 134 while polishing the thread groove 106, so that the polishing film 104 can polish not only the thread root 146 but also the side surfaces 148 of the thread groove 106.

[0039] Therefore, according to the processing device 100, the rotation angle of the pair of backup shoes 128, 130 is adjusted to the lead angle of the thread groove 106 of the workpiece 102, the pair of backup shoes 128, 130 are pressed against the thread bottom 146 of the thread groove 106, and the pair of backup shoes 128, 130 are rotationally vibrated while grinding the thread groove 106, thereby grinding the side surface 148 of the thread groove 106 as well, thereby making it possible to grind the thread groove 106 of the screw-shaped workpiece 102 with high precision.

[0040] The support base 122 is attached to a plate 135 whose distance from the tip 110a of the arm 110 can be adjusted by controlling a backup shoe shift mechanism 137. Therefore, the position at which the backup shoe 128 presses against the thread groove 106 of the workpiece 102 from above can be adjusted to match the lead of the workpiece 102.

[0041] In the above-described processing apparatus 100, the workpiece 102 is sandwiched between a pair of backup shoes 128, 130 from above and below to grind the thread grooves 106, but this is not limited to this, and all of the thread grooves 106 of the rotating workpiece 102 may be ground using only one of the pair of backup shoes 128, 130.

[0042] While 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 is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the claims, and it is understood that such modifications and alterations also fall within the technical scope of the present invention. [Industrial Applicability]

[0043] The present invention can be used as a film lapping device and a film lapping method for lapping a threaded workpiece with a lapping film. [Explanation of symbols]

[0044] 100...film lapping device, 102...workpiece, 104...polishing film, 106...thread groove, 108...main body, 110, 112...arm, 110a, 112a...tip of arm, 114...cylinder, 116, 118...tail of arm, 120, 122...support base, 124, 126...shoe unit, 128, 130...backup shoe, 132, 134...shoe rotation mechanism, 135...plate, 136, 138...support shaft, 137...backup shoe shift mechanism, 140...reel, 142...film guide roller, 144...winding roller, 146...bottom of thread groove, 148...side of thread groove

Claims

1. A film lapping device that polishes a screw-shaped workpiece with a polishing film, the polishing film has a width that covers the thread root and side surfaces of the thread groove of the workpiece, a backup shoe that urges the polishing film against the thread groove of the workpiece and presses it against the thread root; a shoe rotating mechanism that rotates the backup shoe to adjust the rotation angle of the backup shoe to the lead angle of the thread groove of the workpiece, The shoe rotating mechanism rotates and vibrates the backup shoe while polishing the thread groove, causing the backup shoe to oscillate around the longitudinal center line of the thread root, thereby bringing the backup shoe into contact with the side of the thread groove, and polishing the thread root and the side with the polishing film.

2. 2. The film wrap processing device according to claim 1, further comprising a backup shoe shift mechanism for adjusting the position of the backup shoe in accordance with the lead of the workpiece.

3. The backup shoe is configured as a pair, a pair of arms to which the pair of backup shoes are attached and which sandwich the workpiece and urge the pair of backup shoes against the workpiece; a cylinder that opens and closes the pair of arms; 3. The film wrap processing device according to claim 1, further comprising a pair of shoe rotating mechanisms for rotating the pair of backup shoes, respectively.

4. A film lapping method for lapping a threaded workpiece with an abrasive film, comprising: the polishing film has a width that covers the thread root and side surfaces of the thread groove of the workpiece, The backup shoe is rotated to match the rotation angle of the backup shoe with the lead angle of the thread groove of the workpiece. The backup shoe is urged against the screw groove via the polishing film and pressed against the screw root, A film lapping method characterized by rotationally vibrating the backup shoe while polishing the thread groove, and swinging the backup shoe around the longitudinal center line of the thread root to bring the backup shoe into contact with the side surface of the thread groove, thereby polishing the thread root and the side surface with the polishing film.

Images