Skiving machine

Abstract

To provide a skiving processor capable of avoiding interference with a tool or a tool spindle, and preventing deterioration of processing accuracy and reduction in tool life.SOLUTION: A skiving processor 100 according to the present invention includes: a workpiece spindle 110; a base 120; and a tailstock assembly 140 attachably and detachably attached to the base 120, extending in the same direction as the workpiece spindle 110, and having a tailstock shaft 152 arranged in front of the workpiece spindle 110. The tailstock assembly 140 can be attached to a plurality of positions around the workpiece spindle 110.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a skiving machine equipped with a tailstock assembly. [Background technology]

[0002] Tailstocks are a common feature of lathes, but they are also effective in skiving machines when machining axial workpieces (long workpieces). For example, in the machine tool 1 described in Patent Document 1, the tailstock 15 and tailstock shaft 29 are arranged opposite the headstock 13 (see Figure 2). In the gear cutting machine 1 described in Patent Document 2, the tailstock 3' of the workpiece holder 3 is arranged on the tailstock arm 12 (see Figure 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-244582 [Patent Document 2] Japanese Patent Application Publication No. 2018-176415 Summary of the Invention [Problem to be solved by the invention]

[0004] The tailstock moves along the centerline of the workpiece to support the tip of the workpiece. In a lathe, the tool is positioned to the side of the workpiece, but in skiving, the workpiece axis and tool axis are positioned opposite each other, forming a specified crossed-axis angle, and the tool is located close to the workpiece axis. This makes it difficult to position the tailstock in skiving, as it is prone to interference with the tool and tool spindle. Even if it were possible to position the tailstock, it was necessary to increase the tool diameter or lengthen the tool holder to avoid interference. This resulted in problems such as reduced tool rigidity, worsening machining accuracy, and shortening tool life.

[0005] Therefore, the present invention aims to provide a skiving machine that makes it easy to position the tailstock by avoiding interference with the tool and the tool spindle, thereby preventing a deterioration in machining accuracy and a decrease in tool life. [Means for solving the problem]

[0006] In order to solve the above problems, a typical configuration of a skiving machine according to the present invention comprises a work spindle, a base, and a tailstock assembly that is detachably attached to the base, extends in the same direction as the work spindle, and positions the tailstock shaft in front of the work spindle, and is characterized in that the tailstock assembly can be attached to multiple positions centered on the work spindle.

[0007] The tailstock assembly can be connected to and separated from the work spindle, and the plurality of positions may be positions to which the tailstock assembly can be rotated while connected to the work spindle. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a skiving machine that can facilitate the placement of the tailstock by avoiding interference with the tool or tool spindle, thereby preventing deterioration of machining accuracy and shortened tool life. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a diagram illustrating the periphery of the work axis of the skiving machine according to the present embodiment. [Figure 2] 10A and 10B are diagrams illustrating switching of the position of the tailstock assembly. [Figure 3] 10A and 10B are diagrams illustrating switching of the position of the tailstock assembly. [Figure 4] FIG. 2 is a diagram illustrating the state of a workpiece during machining. 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.

[0011] 1 is a diagram illustrating the periphery of the work axis of a skiving machine 100 according to this embodiment (see FIG. 4 for the tool axis). The skiving machine 100 of this embodiment shown in FIG. 1 performs cutting work on a workpiece 102. In this embodiment, an example in which a gear 104 is generated on the outer periphery of the workpiece 102 is illustrated.

[0012] The skiving machine 100 of this embodiment has a work spindle 110 that chucks a workpiece 102. A base 120 is rotatably attached to the work spindle 110.

[0013] A tailstock assembly 140 is also attached to the base 120. The tailstock assembly 140 is detachably attached to the base 120 at an attachment portion 142 with bolts 144. The tailstock assembly 140 has a hydraulic cylinder 146 and an arm 150 arranged in a substantially L-shape. The hydraulic cylinder 146 extends from the base 120 in the same direction as the workpiece spindle 110. The arm 150 extends from the tip of the hydraulic cylinder 146 toward the center of the workpiece spindle 110, and a tailstock shaft 152 is positioned in front of the workpiece spindle 110.

[0014] By supplying hydraulic pressure to the hydraulic cylinder 146, the arm 150 moves in a direction approaching or separating from the workpiece spindle 110. A guide 148 guides the extension and retraction movement of the arm 150.

[0015] A center 154 that abuts against one end of the workpiece 102 is fitted into the tailstock shaft 152. In the skiving machine 100 of this embodiment, a configuration in which the center 154 is fitted into the tailstock shaft 152 has been exemplified. However, this is not limiting, and another part (not shown) such as a chuck may be fitted in place of the center 154.

[0016] Here, for example, a lathe has a work spindle and a tailstock at both ends of the bed. That is, in a lathe, a work spindle and a tailstock are independently provided on both sides of the workpiece. The skiving machine described in Patent Document 1 (JP 2013-244582 A) also has a headstock and a tailstock arranged at both ends of the bed. Similarly, the skiving machine described in Patent Document 2 (JP 2018-176415 A) has a tailstock arm arranged on the opposite side of the workpiece spindle, with the workpiece sandwiched between them.

[0017] However, in the present invention, the workpiece spindle 110 and base 120 are attached to the skiving machine 100, the tailstock assembly 140 extends via the base 120, and the hydraulic cylinder 146 extends in the same direction as the workpiece spindle 110. The arm 150 then bends around to position the tailstock shaft 152 in front of the workpiece spindle 110. In other words, the tailstock assembly 140 is positioned alongside the workpiece spindle 110, not on the opposite side of the tool shaft with the workpiece sandwiched between them. Therefore, there are no tailstock members in the space ahead of the arm 150, and space is secured in which the tool shaft 200 (see FIG. 4) can move.

[0018] 2 and 3 are diagrams illustrating switching of the position of the tailstock assembly 140. In this embodiment, the tailstock assembly 140 can be attached to a position on the rear side of the workpiece spindle 110 as shown in Fig. 2 (attachment position 122a shown in Fig. 3) or a position on the front side of the workpiece spindle 110 as shown in Fig. 2 (attachment position 122b shown in Fig. 2). Compared to Fig. 1, in Figs. 2 and 3, the hydraulic cylinder 146 is extended and the arm 150 is separated from the workpiece spindle 110.

[0019] An oil supply hole 124 that supplies oil to the hydraulic cylinder 146 is formed in the mounting positions 122a and 122b, and a hydraulic hose (not shown) is connected to the tailstock assembly 140. The oil supply hole 124 is exposed at the mounting position 122a or 122b to which the tailstock assembly 140 is not attached. Therefore, by attaching a cover 130 to the mounting position 122a or 122b where the oil supply hole 124 is exposed, it is possible to prevent chips (not shown) generated when cutting the workpiece 102 from entering the oil supply hole 124.

[0020] The plurality of mounting positions 122a, 122b are positions where the tailstock assembly 140 is rotated while connected to the work spindle 110. The tailstock assembly 140 can be connected to and separated from the work spindle 110 by a connecting member 160.

[0021] When switching the tailstock assembly 140 from the position shown in Fig. 2 (mounting position 122a) to the position shown in Fig. 3 (mounting position 122b), first, the connecting member 160 is connected to the tailstock assembly 140 and the workpiece spindle 110 using the bolt 162 as shown in Fig. 2. Then, the bolt 144 that secures the mounting portion 142 to the base 120 is removed. This releases the tailstock assembly 140 from the base 120, and the tailstock assembly 140 is supported by the workpiece spindle 110.

[0022] Once the tailstock assembly 140 is supported by the work spindle 110, the work spindle 110 is rotated in the direction of arrow A shown in Fig. 2. Once the tailstock assembly 140 is positioned on the front side of the work spindle 110 (mounting position 122b) as shown in Fig. 3, the mounting portion 142 is attached to the base 120 with bolts 144, and the connecting member 160 and bolts 162 are removed from the tailstock assembly 140 and work spindle 110. This separates the tailstock assembly 140 from the work spindle 110 and secures it to the base 120. Then, a cover 130 is attached to the mounting position 122a shown in Fig. 3.

[0023] Figure 4 is a diagram illustrating the state when the workpiece 102 is machined. Figure 4(a) is a diagram illustrating the state when the workpiece 102 is machined by the skiving machine 100 shown in Figure 2. Figure 4(b) is a diagram illustrating the state when the workpiece 102 is machined by the skiving machine 100 shown in Figure 3. Both Figures 4(a) and (b) show the skiving machine 100 as viewed from above.

[0024] As shown in FIG. 4( a), when the tool shaft 200 approaches the workpiece 102 from the front side of the workpiece spindle 110, the tailstock assembly 140 is disposed on the rear side of the workpiece spindle 110. This makes it possible to avoid interference between the tool shaft 200 and the cutter 210 and the tailstock assembly 140. On the other hand, as shown in FIG. 4( b), when the tool shaft 200 approaches the workpiece 102 from the rear side of the workpiece spindle 110, the tailstock assembly 140 is disposed on the front side of the workpiece spindle 110. In this case as well, it is possible to avoid interference between the tool shaft 200 and the cutter 210 and the tailstock assembly 140.

[0025] As described above, according to the skiving machine 100 of this embodiment, the tailstock assembly 140 is connected to the workpiece spindle 110, and the tailstock assembly 140 is rotated relative to the workpiece spindle 110. This allows the tailstock assembly 140 to be positioned at multiple positions (mounting positions 122a and 122b).

[0026] In this case, the tailstock assembly 140 is arranged either on the rear side or the front side of the workpiece spindle 110, and the tool shank 200 can be arranged in the other space. Therefore, interference between the skiving machine 100 and the tool shank 200 can be avoided in a minimum space. As a result, it is possible to prevent the tool shank from becoming larger, and it is possible to prevent a decrease in tool rigidity, which would result in a deterioration in machining accuracy or a shortened tool life.

[0027] 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 these modifications and alterations also fall within the technical scope of the present invention. [Industrial Applicability]

[0028] The present invention can be used as a skiving machine equipped with a tailstock assembly. [Explanation of symbols]

[0029] 100... Skiving machine, 102... Workpiece, 104... Gear, 110... Work spindle, 120... Base, 122a... Mounting position, 122b... Mounting position, 124... Oil supply hole, 130... Cover body, 140... Tailstock assembly, 142... Mounting portion, 144... Bolt, 146... Hydraulic cylinder, 148... Guide, 150... Arm, 152... Tailstock shaft, 154... Center, 160... Connecting member, 162... Bolt, 200... Tool shaft, 210... Cutter

Claims

1. The work spindle and With the base, a tailstock assembly that is detachably attached to the base, extends in the same direction as the work spindle, and positions a tailstock shaft in front of the work spindle; A skiving machine characterized in that the tailstock assembly can be attached to a plurality of positions around the work spindle.

2. the tailstock assembly is connectable to and detachable from the work spindle; The skiving machine according to claim 1, wherein the plurality of positions are positions to which the tailstock assembly is rotated while connected to the work spindle.

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