Tool holder positioning device and tool machine

Abstract

A tool holder positioning device is suitable for being arranged on a machine head device of a tool machine and used for arranging a tool holder device, and comprises a first adapter and a second adapter. The first adapter is suitable for being arranged on one of the tool machine and the tool holder device and comprises a convex positioning part, the convex positioning part is provided with a plurality of abutting areas arranged at intervals, and each abutting area is provided with a conical convex abutting face. The second adapter is suitable for being arranged on the other one of the tool machine and the tool holder device, is detachably arranged on the first adapter and comprises a concave positioning part, the concave positioning part is provided with bearing areas with the number corresponding to that of the abutting areas, and each abutting area is provided with a concave abutting face in a conical face shape. By means of the shapes of the convex abutting face and the concave abutting face and by means of the abutting area abutting against the bearing area, positioning is carried out, and the effects of improving positioning precision and prolonging the service life are achieved.

Description

Technical Field

[0001] The present invention relates to a positioning device, and particularly to a tool shank positioning device and a machine tool. Background Art

[0002] Refer to Figure 1 、 Figure 2 A conventional machine tool 11 disclosed in Taiwan Patent No. M545655 of China performs cutting by rotating a tool shank 12 or a workpiece and bringing the tool on the tool shank 12 into contact with the workpiece. For example, in a milling machine, the tool shank 12 is rotated to mill a non-rotating workpiece. Sometimes, according to processing requirements, a fixed seat 13 and a tool shank seat 14 detachably connected to the machine tool 11 and for the tool shank 12 to be set are provided on the machine tool 11. The fixed seat 13 includes two spaced apart protruding columns 131, and the tool shank seat 14 includes two grooves 141 respectively mating with the protruding columns 131. When the tool shank seat 14 is installed on the machine tool 11, the protruding columns 131 are respectively inserted into the grooves 141 to prevent the tool shank seat 14 from rotating.

[0003] However, each protruding column 131 has an outer peripheral surface 132, and each tool shank seat 14 has two inner surface 142 of the groove respectively defining the groove 141. During the installation of the tool shank seat 14 on the machine tool 11, the outer peripheral surface 132 and the inner surface 142 of the groove are continuously rubbed, and due to the large contact area, the friction force is also large, resulting in large wear and thus reducing the service life. If in order to reduce the friction force between the outer peripheral surface 132 and the inner surface 142 of the groove, when a larger gap between the outer peripheral surface 132 and the inner surface 142 is reserved through processing, the positioning accuracy will be reduced, and the larger gap will also cause component loosening and impact. Therefore, there is still room for improvement in terms of improving the positioning accuracy and service life. Summary of the Invention

[0004] The object of the present invention is to provide a tool shank positioning device and a machine tool that can improve the positioning accuracy and service life.

[0005] The tool shank positioning device of the present invention is applicable to be set on the head device of a machine tool and for a tool shank device to be set, and the tool shank positioning device includes a first adapter and a second adapter.

[0006] The first adapter is adapted to be disposed on one of the machine tool and the tool shank device, and includes a first base surface, and a convex positioning portion extending along a first axis from the first base surface. The convex positioning portion has a plurality of abutting regions angularly spaced around the first axis. Each abutting region has a large convex arc edge and a small convex arc edge spaced along the extending direction of the first axis, and a convex abutting surface extending from the large convex arc edge to the small convex arc edge. The distance between the convex abutting surface and the first axis gradually decreases from the large convex arc edge to the small convex arc edge, and the large convex arc edge is located between the small convex arc edge and the first base surface.

[0007] The second adapter is adapted to be disposed on the other of the machine tool and the tool shank device, and is detachably disposed on the first adapter and includes a second base surface, and a concave positioning portion extending along a second axis from the second base surface. The concave positioning portion has bearing regions angularly spaced around the second axis and corresponding in number to the abutting regions. Each bearing region has a large concave arc edge and a small concave arc edge spaced along the extending direction of the second axis, and a concave abutting surface extending from the large concave arc edge to the small concave arc edge. The distance between the concave abutting surface and the second axis gradually decreases from the large concave arc edge to the small concave arc edge, and the large concave arc edge is located between the small concave arc edge and the second base surface.

[0008] The tool shank positioning device can be switched between a disengaged state and a positioned state. In the disengaged state, the first adapter is separated from the second adapter. In the positioned state, the first adapter is locked to the second adapter, and the convex abutting surfaces respectively abut against the concave abutting surfaces.

[0009] In the tool shank positioning device of the present invention, the first adapter is adapted to be disposed on the machine tool, and the second adapter is adapted to be disposed on the tool shank device.

[0010] In the tool shank positioning device of the present invention, the convex positioning portion has three of the abutting regions, and the concave positioning portion has three of the bearing regions.

[0011] In the tool shank positioning device of the present invention, the convex positioning portion has four of the abutting regions, and the concave positioning portion has four of the bearing regions.

[0012] In the tool shank positioning device of the present invention, the distances between the abutting regions and the first axis are equal, and the distances between the bearing regions and the second axis are equal.

[0013] In the tool shank positioning device of the present invention, the abutting regions are angularly spaced at equal angles around the first axis, and the bearing regions are angularly spaced at equal angles around the second axis.

[0014] The machine tool of the present invention includes a base device, a headstock device, the toolholder positioning device as described above, and a toolholder device.

[0015] The headstock device is movably arranged on the base device.

[0016] The toolholder positioning device is detachably arranged on the headstock device.

[0017] The toolholder device is detachably arranged on the toolholder positioning device.

[0018] The beneficial effect of the present invention is that through the shapes of the convex abutting surface and the concave abutting surface, and by using the abutting area to abut against the bearing area for positioning, the friction between the abutting area and the bearing area is reduced before changing to the positioning state, and it is not necessary to increase the gap between the abutting area and the bearing area, achieving the effects of improving the positioning accuracy and service life. Description of the Drawings

[0019] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, where:

[0020] Figure 1 is a perspective view showing an existing toolholder positioning device disclosed in Taiwan Patent No. M545655 of China;

[0021] Figure 2 is a perspective view showing a toolholder seat of the existing toolholder positioning device installed on a machine tool;

[0022] Figure 3 is a front view showing a first embodiment of the toolholder positioning device and the machine tool of the present invention;

[0023] Figure 4 is a front view of the toolholder positioning device of the embodiment;

[0024] Figure 5 is an exploded perspective view of the toolholder positioning device viewed from another perspective;

[0025] Figure 6 is along Figure 4 a cross-sectional view taken along line VI-VI in

[0026] Figure 7 is a front view showing a second embodiment of the toolholder positioning device of the present invention. Detailed Description of the Embodiments

[0027] Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

[0028] Refer to Figure 3 、 Figure 4 、 Figure 5 , a first embodiment of the tool holder positioning device and the machine tool of the present invention, the machine tool includes a base device 2, a head device 3, a tool holder positioning device 4, and a tool holder device 5.

[0029] The head device 3 is movably disposed on the base device 2.

[0030] The tool holder positioning device 4 includes a first adapter 41 detachably disposed on the head device 3, and a second adapter 42 detachably disposed on the first adapter 41.

[0031] Refer to Figure 4 、 Figure 5 、 Figure 6 , the first adapter 41 includes a first base surface 411, and a convex positioning portion 412 extending from the first base surface 411 along a first axis L1. The convex positioning portion 412 has three abutting regions 413 angularly spaced around the first axis L1. Each abutting region 413 has a large convex arc edge 414 and a small convex arc edge 415 spaced along the extending direction of the first axis L1, and a convex abutting surface 416 extending from the large convex arc edge 414 to the small convex arc edge 415. The distance between the convex abutting surface 416 and the first axis L1 gradually decreases from the large convex arc edge 414 to the small convex arc edge 415, and the large convex arc edge 414 is located between the small convex arc edge 415 and the first base surface 411.

[0032] The second adapter 42 includes a second base surface 421, and a concave positioning portion 422 extending from the second base surface 421 along a second axis L2. The concave positioning portion 422 has bearing regions 423 angularly spaced around the second axis L2 and corresponding in number to the abutting regions 413. Each bearing region 423 has a large concave arc edge 424 and a small concave arc edge 425 spaced along the extending direction of the second axis L2, and a concave abutting surface 426 extending from the large concave arc edge 424 to the small concave arc edge 425. The distance between the concave abutting surface 426 and the second axis L2 gradually decreases from the large concave arc edge 424 to the small concave arc edge 425, and the large concave arc edge 424 is located between the small concave arc edge 425 and the second base surface 421.

[0033] More specifically, in the present embodiment, the distances from the abutting area 413 to the first axis L1 are equal, and the distances from the bearing area 423 to the second axis L2 are equal. The abutting areas 413 are arranged at equal angular intervals around the first axis L1, and the bearing areas 423 are arranged at equal angular intervals around the second axis L2. In other embodiments, the distances from the respective abutting areas 413 to the first axis L1, or the angular intervals at which the abutting areas 413 are arranged around the first axis L1, can also be adjusted, and the configuration of the bearing areas 423 can be correspondingly adjusted, but not limited thereto.

[0034] Refer to Figure 3 , Figure 4 , Figure 5 , the tool shank device 5 is detachably arranged on the second adapter 42. In the present embodiment, the first adapter 41 is arranged on the machine head device 3, and the second adapter 42 is for arranging the tool shank device 5. In other embodiments, the second adapter 42 can also be arranged on the machine head device 3, and the first adapter 41 is for arranging the tool shank device 5, but not limited thereto.

[0035] It is worth mentioning that in this embodiment, the machine tool takes an existing milling machine as an example for illustration. In other embodiments, the machine tool can also be a horizontal boring machine, a turning-milling compound machine, etc., but not limited thereto.

[0036] When setting, the tool shank positioning device 4 can be switched between a disengaged state (see Figure 5 ) and a positioning state (see Figure 4 ). In the disengaged state, the first adapter 41 is separated from the second adapter 42. In the positioning state, relative to the second base surface 421, the first base surface 411, the first adapter 41 is locked to the second adapter 42, the convex abutting surfaces 416 respectively abut against the concave abutting surfaces 426, and the first axis L1 substantially coincides with the second axis L2.

[0037] In use, the first adapter 41 can be normally disposed on the machine head device 3, and the second adapter 42 is disposed on the tool shank device 5 to be used. When encountering a machining situation where the rotation of the tool shank device 5 needs to be restricted, the second adapter 42 together with the tool shank device 5 is mounted on the first adapter 41 in such a way that the bearing area 423 is aligned with the abutting area 413. If the convex abutting surface 416 and the concave abutting surface 426 do not fit, the second adapter 42 can be slightly rotated about the second axis L2 so that the bearing area 423 is aligned with the abutting area 413, and then the first adapter 41 and the second adapter 42 are locked to complete the positioning. Since the convex abutting surface 416 and the concave abutting surface 426 are conical surfaces, there are only two situations during the positioning process: not aligned and stuck or aligned but not in contact, and there will be no situation of surface-to-surface contact, thus avoiding the friction between the convex abutting surface 416 and the concave abutting surface 426.

[0038] Compared with Figure 1 、 2 the existing machine tool 11 and tool shank 12 shown, in the present invention, since the convex abutting surface 416 and the concave abutting surface 426 are conical surfaces, before the convex abutting surface 416 fits the concave abutting surface 426 and transforms into the positioning state, the contact area between the convex abutting surface 416 and the concave abutting surface 426 is reduced, and there is no need to increase the gap between the abutting area 413 and the bearing area 423, achieving the effects of improving the positioning accuracy and service life. In addition, because there is no need to increase the gap between the abutting area 413 and the bearing area 423, the convex abutting surface 416 and the concave abutting surface 426 can be machined with high precision, further achieving the effect of improving the positioning accuracy. Additionally, in the positioning state, the convex abutting surface 416 and the concave abutting surface 426 fit and are located inside the structure. Therefore, compared with the exposed structure in the prior art, the first embodiment of the tool shank positioning device and the machine tool of the present invention can prevent dust and reduce collisions, further achieving the effect of improving the service life.

[0039] It is worth mentioning that since the convex abutting surface 416 and the concave abutting surface 426 are conical surfaces, when the convex abutting surface 416 fits the concave abutting surface 426, it can resist torque to prevent the tool shank device 5 from rotating. Moreover, since the distances from the abutting area 413 to the first axis L1 are equal, the distances from the bearing area 423 to the second axis L2 are equal, the abutting area 413 is arranged at equal angular intervals around the first axis L1, and the bearing area 423 is arranged at equal angular intervals around the second axis L2, when in the positioning state, the tool shank positioning device 4 is more stable, thereby improving the accuracy during machining.

[0040] Refer toFigure 7 , a second embodiment of the tool handle positioning device and the machine tool of the present invention, which is the same as the first embodiment. The tool handle positioning device 4 includes the first adapter 41 and the second adapter 42. The difference is that: the convex positioning portion 412 has four of the abutting areas 413, and the concave positioning portion 422 has four of the bearing areas 423. The convex positioning portion 412 also protrudes from the first base surface 411, and the concave positioning portion 422 is also recessed in the second base surface 421. Each abutting area 413 also has the large convex arc edge 414, the small convex arc edge 415, and the convex abutting surface 416. Each bearing area 423 also has the large concave arc edge 424, the small concave arc edge 425, and the concave abutting surface 426.

[0041] In this way, the second embodiment can achieve the same effect as the first embodiment.

[0042] In summary, the tool handle positioning device and the machine tool of the present invention can indeed achieve the purpose of the present invention.

Claims

1. A tool shank positioning device is applicable to be arranged on the spindle head device of a machine tool and for arranging a tool shank device. It is characterized in that: The tool shank positioning device includes a first adapter and a second adapter. The first adapter is applicable to be arranged on one of the machine tool and the tool shank device, and includes a first base surface, and a convex positioning portion extending along a first axis from the first base surface. The convex positioning portion has a plurality of abutting areas arranged at angular intervals around the first axis. Each abutting area has a large convex arc edge and a small convex arc edge arranged at intervals along the extending direction of the first axis, and a convex abutting surface extending from the large convex arc edge to the small convex arc edge. The distance between the convex abutting surface and the first axis gradually decreases from the large convex arc edge to the small convex arc edge. The large convex arc edge is located between the small convex arc edge and the first base surface. The second adapter is applicable to be arranged on the other of the machine tool and the tool shank device, and is detachably arranged on the first adapter and includes a second base surface, and a concave positioning portion extending along a second axis from the second base surface. The concave positioning portion has bearing areas arranged at angular intervals around the second axis and corresponding in number to the abutting areas. Each bearing area has a large concave arc edge and a small concave arc edge arranged at intervals along the extending direction of the second axis, and a concave abutting surface extending from the large concave arc edge to the small concave arc edge. The distance between the concave abutting surface and the second axis gradually decreases from the large concave arc edge to the small concave arc edge. The large concave arc edge is located between the small concave arc edge and the second base surface. The tool shank positioning device can be changed between a disengaged state and a positioned state. In the disengaged state, the first adapter is separated from the second adapter. In the positioned state, the first adapter is locked to the second adapter, and the convex abutting surfaces respectively abut against the concave abutting surfaces.

2. The tool shank positioning device according to claim 1, It is characterized in that: The first adapter is applicable to be arranged on the machine tool, and the second adapter is applicable to be arranged on the tool shank device.

3. The tool shank positioning device according to claim 1, It is characterized in that: The convex positioning portion has three of the abutting areas, and the concave positioning portion has three of the bearing areas.

4. The tool shank positioning device according to claim 1, It is characterized in that: The convex positioning portion has four of the abutting areas, and the concave positioning portion has four of the bearing areas.

5. The tool shank positioning device according to claim 1, It is characterized in that: The distances between the abutting areas and the first axis are equal, and the distances between the bearing areas and the second axis are equal.

6. The tool shank positioning device according to claim 1, It is characterized in that: The abutting areas are arranged at equal angular intervals around the first axis, and the bearing areas are arranged at equal angular intervals around the second axis.

7. A machine tool, It is characterized in that: Comprising a base device, a head device, a tool handle positioning device according to claim 1, and a tool handle device, wherein the head device is movably arranged on the base device, the tool handle positioning device is detachably arranged on the head device, and the tool handle device is detachably arranged on the tool handle positioning device.

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