Film wrapping machine

Abstract

The present invention provides a film wrapping apparatus capable of suitably polishing the tooth surface of a workpiece and manufacturing workpieces with screw shapes that exhibit high precision and high-quality surface characteristics. [Solution] A film lapping apparatus for polishing the tooth surfaces 14a and 14b of a screw-shaped workpiece 10, comprising: a polishing film 110 for polishing the tooth surfaces 14a and 14b; a polishing unit for bringing the polishing film 110 into contact with the tooth surfaces 14a and 14b; and a floating shaft for supporting the polishing unit so that it can rotate in accordance with the lead angle of the workpiece. The polishing unit comprises: two shoes 210a and 210b facing the tooth surfaces 14a and 14b on both sides of the screw groove 12 of the workpiece 10; a wedge 220 for inserting between the two shoes 210a and 210b to separate them; and a sliding shaft for supporting the shoes 210a and 210b so that they can slide in a direction perpendicular to the insertion direction of the wedge 220.

Description

Technical Field

[0006] ,

[0001] The present invention relates to a film wrap processing apparatus for polishing the tooth surface of a screw-shaped workpiece.

Background Art

[0002] As a method for polishing a workpiece of a metal part, film wrap processing is known. Film wrap processing is a polishing method performed using a polishing film having abrasive grains applied to its surface. As an apparatus for performing film wrap processing, for example, Patent Document 1 discloses a "groove processing apparatus for processing a groove of a workpiece".

[0003] The groove processing apparatus of Patent Document 1 includes "a backup member having a convex tip surface corresponding to the cross-section of the groove and entering the tip surface into the groove, a lapping tape that is wound around the tip surface of the backup member and has a shape along the tip surface, a tape supply mechanism that supplies the lapping tape toward the backup member so that the lapping tape is stretched in a direction parallel to the groove of the workpiece, and a pressing mechanism that presses the tip surface of the backup member together with the lapping tape toward the inner surface of the groove".

[0004] In the groove processing apparatus of Patent Document 1, an example of polishing the ball rolling groove of a slider for a linear guide as a workpiece is illustrated. The backup member of Patent Document 1 is made of a material having rubber elasticity, such as urethane elastomer, and its tip surface is formed according to the arc-shaped cross-section of the groove.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In a configuration where a rubber-elastic backup member is pressed against a groove in a workpiece for polishing, as described in Patent Document 1, the backup member deforms when pressed, and the greatest pressure load is applied to the tip of the backup member. As a result, the tooth root (the surface near the apex of the arc) is polished intensively in the groove, while the tooth surface (the surfaces on both sides of the apex) is polished less thoroughly than the tooth root. Consequently, the polishing in the groove becomes uneven, making it impossible to adequately ensure machining accuracy and, consequently, product quality.

[0007] In view of these problems, the present invention aims to provide a film wrapping apparatus that can suitably polish the tooth surface of a workpiece and manufacture a screw-shaped workpiece with high precision and high-quality surface characteristics. [Means for solving the problem]

[0008] To solve the above problems, a typical configuration of the film wrapping apparatus according to the present invention is a film wrapping apparatus for polishing the tooth surface of a screw-shaped workpiece, comprising: a polishing film for polishing the tooth surface; a polishing unit for bringing the polishing film into contact with the tooth surface; and a floating shaft that rotatably supports the polishing unit in accordance with the lead angle of the workpiece, wherein the polishing unit comprises: two shoes facing the tooth surfaces on both sides of the screw groove of the workpiece; a wedge inserted between the two shoes to separate them; and a sliding shaft that slidably supports the shoes in a direction perpendicular to the insertion direction of the wedge.

[0009] According to the present invention, the direction in which the polishing film is applied does not need to be aligned with the lead angle of the screw-shaped workpiece. The polishing film is preferably arranged perpendicular to the axis of the workpiece. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a film wrapping apparatus that can suitably polish the tooth surface of a workpiece and manufacture a screw-shaped workpiece with high precision and high quality surface characteristics. [Brief explanation of the drawing]

[0011] [Figure 1] This diagram illustrates the schematic of the film wrapping apparatus according to this embodiment. [Figure 2] This is a magnified view of the polishing unit. [Figure 3] This is a diagram illustrating the internal structure of the polishing unit. [Figure 4] This is a diagram illustrating the main components of the polishing unit. [Figure 5] This is a magnified view of the vicinity of the two shoes in Figure 3. [Figure 6] This is a magnified view of the vicinity of a conventional backup shoe. [Figure 7] This diagram illustrates the polishing process of a workpiece using the processing apparatus of this embodiment. [Modes for carrying out the invention]

[0012] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific numerical values ​​shown in these embodiments are merely illustrative to facilitate understanding of the invention and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same function or configuration are denoted by the same reference numerals to avoid redundant explanations, and elements not directly related to the present invention are not shown or described.

[0013] Figure 1 is a diagram illustrating the schematic of a film wrapping apparatus (hereinafter referred to as the processing apparatus 100) according to this embodiment. Figure 1(a) illustrates the processing apparatus 100 as viewed from above (on the polishing film 110 side). Figure 1(b) illustrates the processing apparatus 100 as viewed from below (on the workpiece 10 side).

[0014] As shown in FIGS. 1(a) and (b), in the processing apparatus 100 of this embodiment, the tooth surface of the screw-shaped workpiece 10 is polished using the polishing film 110. As shown in FIGS. 1(a) and (b), the processing apparatus 100 of this embodiment includes a polishing film 110, a polishing unit 200, and a floating shaft 140.

[0015] The polishing film 110 is a film for polishing the tooth surface of the workpiece 10. The polishing film 110 is supplied from the supply reel 120 to the polishing unit 200 via the supply-side roller 122, and is wound onto the take-up reel 130 via the take-up-side roller 132. Note that the mechanism for supporting the supply reel 120 and the take-up reel 130 is not shown.

[0016] FIG. 2 is an enlarged view of the polishing unit 200. FIG. 3 is a diagram for explaining the internal structure of the polishing unit 200. FIG. 4 is a diagram for explaining the main part of the polishing unit 200. For convenience of illustration, the polishing film 110 is not shown in FIGS. 2 to 4.

[0017] The polishing unit 200 shown in FIGS. 2 to 4 is an assembly for bringing the polishing film 110 into contact with the tooth surface of the workpiece 10. The polishing unit 200 is rotatably supported in the R direction following the lead angle α (see FIG. 7) of the workpiece 10 by the floating shaft 140. As shown in FIGS. 2 and 3, the floating shaft 140 is supported by the support column 102 and is connected to an arm (not shown) of the processing apparatus 100 via the support column 102.

[0018] As shown in FIG. 4, the polishing unit 200 includes two shoes 210a, 210b and a wedge 220. Specifically, the polishing unit 200 has a connecting plate 202 connected to the floating shaft 140, and the wedge 220 is supported by the connecting plate 202.

[0019] As shown in FIG. 3, a bracket 240 is connected to the connecting plate 202 via a damper 250 to be described later. The bracket 240 has a channel shape including a connecting surface 242 and two side surfaces 244, and is arranged in an open - downward state in the drawing. The connecting surface 242 is a surface indirectly connected to the connecting plate 202. The side surface 244 is a surface bent and extending from the connecting surface 242, and a shaft hole 244a is formed therein.

[0020] Inside the bracket 240, two metal shoes 210a, 210b made of, for example, steel are accommodated. The two shoes 210a, 210b are so - called polishing blocks, and are arranged such that their inner surfaces 212 face each other as shown in FIG. 3. Also, the two shoes 210a, 210b each have an inclined surface 214 on their inner surfaces 212 facing each other, into which a wedge 220 is inserted.

[0021] One end of the wedge 220 is fixed to the connecting plate 202, and the other end (hereinafter referred to as the tip 222) is arranged to be insertable between the inclined surfaces 214 of the two shoes 210a, 210b. Also, as shown in FIG. 2, a damper 250 is provided between the connecting plate 202 and the side surface 244. When the work 10 is sandwiched by the two polishing units 200 by an arm (not shown), after the polishing unit 200 hits the work 10 and then the arm is further closed, the damper 250 causes the polishing unit 200 to move (recede) toward the support column 102.

[0022] As shown in FIG. 4, insertion holes 216 are formed in the two shoes 210a, 210b at positions adjacent to the inclined surfaces 214. The slide shaft 230 shown in FIGS. 2 and 3 is inserted into the shaft hole 244a of the bracket 240 and the insertion holes 216 of the two shoes 210a, 210b. Thereby, the two shoes 210a, 210b are supported by the bracket 240 so as to be slidable in a direction orthogonal to the insertion direction of the wedge 220. A return spring 232 that biases the two shoes 210a, 210b in a direction approaching each other (closing direction) is fitted onto such a slide shaft 230.

[0023] Furthermore, the two shoes 210a and 210b each have a tip portion 218, and an elastic sheet 260 is provided on the outer surface of the tip portion 218. For example, a sheet of rubber or urethane can be used as the elastic sheet 260. This provides appropriate flexibility, so that the elastic sheet 260 deforms due to the load transmitted from the two shoes 210a and 210b, making it possible to suitably adhere the abrasive film 110 to the workpiece 10.

[0024] Figure 5 is an enlarged view of the vicinity of the two shoes 210a and 210b in Figure 3. Figure 6 is an enlarged view of the vicinity of a conventional backup shoe 40. As shown in Figures 5 and 6, the screw-shaped workpiece 10 to be machined has a screw groove 12 consisting of a pair of opposing tooth surfaces 14a and 14b and a tooth root 16 positioned between them. In both the two shoes 210a and 210b of this embodiment shown in Figure 5, and the conventional backup shoe 40 illustrated in Figure 6, the target of the grinding process is the pair of tooth surfaces 14a and 14b of the screw-shaped workpiece 10.

[0025] In conventional polishing processes for workpieces 10, as shown in Figure 6, a backup shoe 40 made of an elastic material such as rubber or urethane presses the polishing film 50 against the workpiece 10. However, with this configuration, the greatest load is applied to the tip 42 of the backup shoe 40 when pressing the polishing film 110.

[0026] As a result, the tip 42 of the backup shoe 40 deforms under load, and even if the polishing film 50 contacts the entire surface of the screw groove 12, the load is mainly applied to the tooth root 16. When the backup shoe 40 bottoms out in this way, only the tooth root 16 is polished intensively, and the tooth surfaces 14a and 14b on both sides are not properly polished by the polishing film 50. Consequently, the polishing of the target tooth surfaces 14a and 14b becomes insufficient, and the machining accuracy and, consequently, the quality of the product cannot be adequately ensured.

[0027] Therefore, in the processing apparatus 100 of this embodiment, two shoes 210a and 210b are used to polish the tooth surfaces 14a and 14b of the workpiece 10. In detail, before polishing begins, as shown in Figure 5(a), the inner surfaces 212 of the two shoes 210a and 210b are in contact with each other, and the tip 218 is inserted into the screw groove 12. The elastic sheet 260, which is placed on the outer surface of the tip 218, is positioned to face the tooth surfaces 14a and 14b on both sides of the screw groove 12 of the workpiece 10 via the polishing film 110. At this time, the tip 222 of the wedge 220 is located in the upper part of the space formed by the inclined surfaces 214 of the two shoes 210a and 210b.

[0028] At the start of polishing, as shown in Figure 5(b), the wedge 220 is inserted between the two shoes 210a and 210b by closing an arm (not shown), causing the two shoes 210a and 210b to separate. At this time, the two shoes 210a and 210b are each supported on the slide shaft 230 so as to be slidable in a direction perpendicular to the insertion direction of the wedge 220. Therefore, when the wedge 220 is inserted between the two shoes 210a and 210b, the two shoes 210a and 210b move in a direction perpendicular to the insertion direction of the wedge 220 and separate.

[0029] The two shoes 210a and 210b, which have moved in a direction perpendicular to the insertion direction of the wedge 220, press the elastic sheets 260 positioned on their respective outer surfaces toward the tooth surfaces on both sides. As a result, the two elastic sheets 260 firmly press the polishing film 110 against the tooth surfaces 14a and 14b, and the tooth surfaces 14a and 14b are polished.

[0030] As described above, according to the processing apparatus 100 of this embodiment, the two shoes 210a and 210b move in a direction perpendicular to the wedge insertion direction (biasing direction by the arm), pressing the elastic sheet 260 toward the tooth surfaces 14a and 14b on both sides. In other words, the two shoes 210a and 210b do not press toward the tooth root 16. This prevents the two shoes 210a and 210b from bottoming out, and allows for efficient and reliable polishing of the tooth surfaces 14a and 14b of the workpiece. Therefore, the workpiece 10 can be processed with high precision, and product quality can be improved.

[0031] Figure 7 illustrates the polishing process of a workpiece 10 using the processing apparatus 100 of this embodiment. Figure 7(a) is an example of a view of the processing apparatus 100 working on the workpiece 10, observed from below. Figure 7(b) is a magnified view of the polished area of ​​the workpiece 10, observed from above. For the sake of explanation, in Figure 7(b), the two shoes 210a and 210b are not shown, and only the elastic sheet 260 at the tip 218 is shown.

[0032] As explained earlier, in the processing apparatus 100 of this embodiment, the polishing unit 200 is supported by a floating shaft 140 so as to be rotatable in the R direction (see Figure 2) following the lead angle α (angle of the screw groove 12) of the workpiece 10. Therefore, when polishing the workpiece 10, the polishing unit 200 tilts (rotates) following the screw groove of the workpiece 10, as shown in Figure 7(a). Then, as shown in Figure 7(b), elastic sheets 260 attached to the two shoes 210a and 210b press the polishing film 110 against the tooth surfaces 14a and 14b of the workpiece 10. In this state, the workpiece 10 is moved spirally (moved axially while rotating according to the lead angle α) to perform polishing.

[0033] Here, since the two shoes 210a and 210b rotate in accordance with the lead angle α of the workpiece 10, there is no need to change the angle of the polishing film 110 according to the lead angle of the workpiece 10. Therefore, the direction in which the polishing film 110 is stretched can be positioned perpendicular to the axis of the workpiece 10 (stretched so that it runs perpendicular to the axis). As a result, as shown in Figure 1, the supply reel 120 and the winding reel 130 can be fixed in place regardless of the lead angle α of the workpiece 10 to be processed.

[0034] In this embodiment, a configuration in which the workpiece 10 is moved spirally (rotated along the lead angle α while being moved in the axial direction) is illustrated as the polishing process, but the invention is not limited to this configuration. Similar effects can be obtained by rotating the workpiece 10 while moving the polishing unit 200 in the axial direction of the workpiece 10.

[0035] Preferred embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to these examples. It is clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally also fall within the technical scope of the present invention. [Industrial applicability]

[0036] This invention can be used in a film lapping apparatus for polishing the tooth surfaces of screw-shaped workpieces. [Explanation of Symbols]

[0037] 10…Workpiece, 12…Screw groove, 14a…Tooth surface, 14b…Tooth surface, 16…Tooth root, 40…Backup shoe, 42…Tip, 50…Abrasive film, 100…Processing device, 102…Support column, 110…Abrasive film, 120…Supply reel, 122…Supply side roller, 130…Take-up reel, 132…Take-up side roller, 140…Floating shaft, 200…Abrasive unit, 202…Connecting plate, 210a…Shoe, 210b…Shoe, 212…Inner surface, 214…Inclined surface, 216…Through hole, 218…Tip, 220…Wedge, 222…Tip, 230…Slide shaft, 232…Return spring, 240…Bracket, 242…Connecting surface, 244…Side, 244a…Shaft hole, 250…Damper, 260…Elastic sheet

Claims

1. A film lapping apparatus for polishing the tooth surface of a screw-shaped workpiece, A polishing film for polishing the tooth surface, A polishing unit that brings the polishing film into contact with the tooth surface, A floating shaft that supports the polishing unit so that it can rotate in accordance with the lead angle of the workpiece, Equipped with, The polishing unit is Two shoes facing the tooth surfaces on both sides of the screw groove of the workpiece, A wedge is inserted between the two shoes to separate them, A slide shaft that supports the shoe so that it can slide in a direction perpendicular to the insertion direction of the wedge, A film wrapping apparatus characterized by comprising the following features.

2. The film wrapping apparatus according to claim 1, characterized in that the polishing film is arranged in a direction perpendicular to the axis of the workpiece.

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