Film wrapping device

Abstract

To provide a film wrapping device capable of detect the meshing between a gear-shaped workpiece and a gear-shaped backup tool, thereby reducing the burden on workers and enhancing work efficiency.SOLUTION: The film wrapping device of the present invention comprises: a workpiece holding device that holds a workpiece W; a gear-shaped backup tool 140 that meshes with the workpiece; a supply reel 162 that supplies an abrasive film 170; a take-up reel 164 that winds up the abrasive film; a slide table; a slide motor that moves the slide table in a direction toward and away from the workpiece holding device; a tension sensor that detects tension of the abrasive film; and a controller. The controller is characterized in that when operating the slide motor to bring the slide table closer to the workpiece holding device, detects, by means of the tension sensor, an increase in the tension in the abrasive film, and thereby, determines that the backup tool and the workpiece are meshed.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a film lapping device that polishes the tooth surfaces of a gear-shaped workpiece with a polishing film. [Background technology]

[0002] Film lapping is known as a method for polishing metal workpieces. Film lapping is a polishing method that uses an abrasive film with abrasive grains applied to the surface. One example of a film lapping method is a method for polishing external gears, as disclosed in Patent Document 1. The method for polishing external gears in Patent Document 1 is characterized by "pressing an abrasive film against the tooth surface of the external gear by backing up with a pressing member, and then polishing the tooth surface by sliding the teeth of the external gear and the abrasive film relative to each other in the tooth profile direction." [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-205377 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the workpiece to be machined has external teeth with a trochoid gear or arc-shaped tooth profile on its periphery. That is, the outer periphery of the workpiece in Patent Document 1 has external teeth with gently undulating surfaces. With such a workpiece, it is possible to polish it by tracing the external teeth of the workpiece by pressing an abrasive film with a pressing member as in Patent Document 1. However, with a workpiece having a rectangular shape (mainly an involute tooth profile), such as a spur gear, simply pressing an abrasive film with a pressing member as in Patent Document 1 can polish the tooth tips, but it is difficult to polish the tooth flanks.

[0005] As a result of extensive research, the inventors came up with the idea of ​​using a gear-shaped backup tool to press a film abrasive against the tooth surface of the workpiece to polish it. After conducting a test run, they discovered that if the workpiece and backup tool are both gear-shaped, their teeth may collide when they are brought close together to mesh (meshing may fail). This requires the operator to check every time whether the workpiece and backup tool are meshed, resulting in unnecessary work.

[0006] In view of these problems, the present invention aims to provide a film wrap processing device that can detect the meshing of a gear-shaped workpiece and a gear-shaped backup tool, thereby reducing the burden on workers and improving work efficiency. [Means for solving the problem]

[0007] In order to solve the above problems, a typical configuration of a film lapping device according to the present invention is a film lapping device that polishes the tooth surface of a gear-shaped workpiece with a polishing film, and is equipped with a work holding device that holds the workpiece rotatably, a gear-shaped backup tool that meshes with the workpiece via the polishing film, a supply reel that supplies the polishing film to the backup tool, a take-up reel that winds up the polishing film from the backup tool, a slide table on which the backup tool, supply reel, and take-up reel are mounted, a slide motor that moves the slide table in a direction toward and away from the work holding device, a tension sensor that detects the tension of the polishing film, and a control unit, wherein when the slide motor is operated to bring the slide table closer to the work holding device, the control unit detects an increase in tension in the polishing film using the tension sensor and determines that the backup tool and the workpiece are meshed. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a film wrap processing device that can detect the meshing between a gear-shaped workpiece and a gear-shaped backup tool, thereby reducing the burden on workers and improving work efficiency. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an overall perspective view of a film wrap processing device according to an embodiment of the present invention. [Figure 2] 2 shows the processing device of FIG. 1 as viewed from the side. [Figure 3] FIG. 2 is a side view of a main part of the processing device of FIG. [Figure 4] FIG. 10 is a diagram showing a state in which the backup tool and the workpiece are not engaged with each other. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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 or described.

[0011] Fig. 1 is an overall perspective view of a film wrap processing device (hereinafter referred to as processing device 100) according to this embodiment. Fig. 2 shows the processing device 100 of Fig. 1 as viewed from the side. The processing device 100 shown in Figs. 1 and 2 polishes the tooth surface of a gear-shaped workpiece W with a polishing film 170. A control unit 198 is connected to the processing device 100, which controls the operation of the slide motor 126, the tool rotation motor 150, etc.

[0012] As shown in Fig. 1, the processing apparatus 100 of this embodiment includes a workpiece holding device 110 and a polishing device 120. Although the workpiece holding device 110 is shown as floating in Fig. 1, it is actually fixed to a table (not shown). The workpiece holding device 110 has a work table 112, a pair of holders 114, and a shaft 116. The pair of holders 114 are attached to the work table 112, and the shaft 116 is inserted through them. The workpiece W is rotatably held in the workpiece holding device 110 by being inserted through the shaft 116.

[0013] The polishing apparatus 120 includes a base 122 , a slide table 130 , a first support wall 132 , a second support wall 134 , a backup tool 140 , a tool rotation motor 150 , a supply reel 162 , and a take-up reel 164 .

[0014] A rail 124 on which the slide table 130 runs, and a slide motor 126 are attached to the base 122. According to this configuration, by driving the slide motor 126, the slide table 130 runs on the rail 124 and can slide on the base 122. This causes the backup tool 140 to approach and separate from the workpiece W.

[0015] The first support wall 132 and the second support wall 134 are attached to the slide table 130 in a spaced-apart relationship. The backup tool 140 and the tool rotation motor 150 are supported by the first support wall 132. The supply reel 162 and the take-up reel 164 are supported by the second support wall 134.

[0016] The backup tool 140 is a component that engages with the workpiece W via the polishing film 170. The tool rotation motor 150 is a drive source that rotates the backup tool 140. The slide motor 126 moves the slide table 130 toward the workpiece holding device 110 in the approaching / removing direction.

[0017] The supply reel 162 supplies the polishing film 170 to the backup tool 140. The take-up reel 164 takes up the polishing film 170 from the backup tool 140. The backup tool 140, the supply reel 162, and the take-up reel 164 are mounted on the slide table 130.

[0018] 2, the processing apparatus 100 of this embodiment is equipped with a tension sensor 200 that detects the tension of the polishing film 170. The tension sensor 200 is fixed to a support portion 132a provided on the back surface of the first support wall 132. The tension sensor 200 has two fixed pins 222, 224 and one movable pin 226 provided on a fixed plate 210, with the polishing film 170 positioned between them.

[0019] Fig. 3 is a side view of the main part of the processing apparatus 100 of Fig. 1. Fig. 3(a) illustrates an example of the processing apparatus 100 when not in operation. Fig. 3(b) illustrates an example of a state in which the backup tool 140 and the workpiece W are engaged. Fig. 4 is a diagram illustrating a state in which the backup tool 140 and the workpiece W are not engaged.

[0020] 3(a) and 3(b), the gear-shaped workpiece W has rectangular external teeth W1, and in this embodiment, the tooth surfaces W2 of the external teeth W1 are ground. The backup tool 140 is a gear with the same module as the workpiece W, and has rectangular external teeth 142 like the workpiece W.

[0021] When the processing apparatus 100 is not operating, the polishing film 170 is spaced apart from the workpiece W and is stretched over the front surface of the backup tool 140, as shown in Fig. 3(a). At this time, the tension sensor 200 detects that the polishing film 170 is stretched along the fixed pins 222, 224 and the movable pin 226.

[0022] When machining the workpiece W, the control unit 198 operates the slide motor 126 to move the slide table 130 closer to the workpiece holding device 110. That is, the control unit 198 moves the polishing device 120 relative to the workpiece W. When the teeth and tooth grooves of the backup tool 140 and the workpiece W mesh properly, the polishing film 170 is sandwiched between the backup tool 140 and the teeth of the workpiece W and follows the gap, as shown in FIG. 3(b). This brings the polishing surface of the polishing film 170 into contact with the tooth surface W2 of the workpiece W.

[0023] At this time, tension is generated in the polishing film 170 as the polishing film 170 follows the teeth of the backup tool 140 and the workpiece W. This causes the tension sensor 200 to detect an increase in the tension of the polishing film 170, causing a positional displacement of the movable pin 226. As a result, the control unit 198 detects an increase in the tension of the polishing film 170 by the tension sensor 200 and determines that the backup tool 140 and the workpiece W are engaged with each other.

[0024] As shown in Figure 4, if the teeth and tooth grooves of the backup tool 140 and the workpiece W do not mesh, that is, if the teeth butt against each other, the tension sensor 200 will not detect an increase in tension. This is because the polishing film 170 is simply pinched between the teeth, and the path length does not change. If the slide table 130 moves to the expected position without a change in tension (at this point, the backup tool 140 or some other part is deformed), it can be determined that meshing has failed. Instead of movement to the expected position, it may be determined that "the slide table 130 has stopped without a change in tension" based on an increase in the drive torque of the slide motor 126 (the drive current increases to or exceeds a predetermined value).

[0025] If it is determined that the meshing has failed, the slide table 130 is returned slightly, and the tool rotation motor 150 is used to rotate the backup tool 140 by about 1 / 3 to 1 / 2 pitch, so that the slide table 130 is again brought closer to the workpiece W. This eliminates the state in which the teeth of the backup tool 140 and the teeth and tooth spaces of the workpiece W mesh correctly.

[0026] According to the above configuration, the backup tool 140 can be automatically and reliably engaged with the workpiece W. This eliminates the need for an operator to check the engagement between the backup tool 140 and the workpiece W. This reduces the burden on the operator and improves work efficiency.

[0027] 3(b), when the tool rotation motor 150 is driven to rotate the backup tool 140, the workpiece W is rotated by the rotation. As a result, the tooth surfaces 144 of the external teeth 142 of the gear-shaped backup tool 140 press the polishing film 170 against the tooth surfaces W2 of the external teeth W1 of the workpiece W. This allows the tooth surfaces W2 of the external teeth W1 of the workpiece W to be suitably polished by the polishing film 170. This improves the smoothness of the tooth surfaces W2 of the workpiece W, making it possible to improve noise reduction and vibration suppression performance after the workpiece W is incorporated into a product.

[0028] Furthermore, the processing apparatus 100 of this embodiment has an oscillation device 192 that oscillates the workpiece holding device 110 in the width direction. This allows the workpiece W to be oscillated (vibrated) in addition to polishing the external teeth W1 of the workpiece W as described above. Therefore, the smoothness of the tooth surface W2 of the workpiece W can be further improved, and the above-mentioned effects can be improved.

[0029] 1, in the processing apparatus 100 of this embodiment, the shaft 140a of the backup tool 140, the shaft 162a of the supply reel 162, and the shaft 164a of the take-up reel 164 are connected by a drive belt 180. As a result, when the tool rotation motor 150 is driven to rotate the shaft 140a of the backup tool 140, the shaft 162a of the supply reel 162 and the shaft 164a of the take-up reel 164 can be rotated. Therefore, motors for rotating the supply reel 162 and the take-up reel 164 are not required, which makes it possible to reduce the cost of the apparatus.

[0030] However, the supply and take-up amounts of the polishing film 170 on the supply reel 162 and take-up reel 164 vary depending on the reel diameter of the polishing film 170. Therefore, in the processing apparatus 100 of this embodiment, torque limiters 190 are provided on the shaft 162a of the supply reel 162 and the shaft 164a of the take-up reel 164, respectively. This makes it possible to absorb the difference in the supply amount of the supply reel 162 and the take-up amount of the take-up reel 164 relative to the feed amount of the polishing film 170 caused by driving the tool rotation motor 150. This makes it possible to effectively prevent damage to the polishing film 170 due to slack or tension in the polishing film 170.

[0031] 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 these 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 these modifications and alterations also fall within the technical scope of the present invention. [Industrial Applicability]

[0032] The present invention can be used in a film lapping device that polishes the tooth surface of a gear-shaped workpiece with a polishing film. [Explanation of symbols]

[0033] W1...external teeth, W2...tooth surface, 100...processing device, 110...workpiece holding device, 112...work table, 114...holder, 116...shaft, 120...polishing device, 122...base, 124...rail, 126...slide motor, 130...slide table, 132...first support wall, 132a...support portion, 134...second support wall, 140...backup tool, 140a...shaft, 142... External teeth, 144...tooth surface, 150...tool rotation motor, 162...supply reel, 162a...shaft, 164...take-up reel, 164a...shaft, 170...polishing film, 180...drive belt, 190...torque limiter, 192...oscillation device, 198...control unit, 200...tension sensor, 210...fixed plate, 222...fixed pin, 224...fixed pin, 226...movable pin, W...work

Claims

[Claim 1] A film lapping device that polishes the tooth surface of a gear-shaped workpiece with a polishing film, a workpiece holding device that rotatably holds the workpiece; a gear-shaped backup tool that meshes with the workpiece via the polishing film; a supply reel that supplies the polishing film to the backup tool; a take-up reel that takes up the polishing film from the backup tool; a slide table on which the backup tool, the supply reel, and the take-up reel are mounted; a slide motor that moves the slide table in a direction toward or away from the workpiece holding device; a tension sensor for detecting the tension of the polishing film; a control unit; The control unit is characterized in that when the slide motor is operated to bring the slide table closer to the work holding device, the control unit detects an increase in tension in the abrasive film using the tension sensor and determines that the backup tool and the work are engaged.

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