machining tool

Abstract

The invention discloses a machining tool that produces little wear at the joint of a main drive shaft (14) and a transmission shaft (5). The machining tool comprises an upper shaft (6) attached to a main machine device, a transmission shaft (5) inserted into the upper shaft (6), a main drive shaft (14) attached to the head of the transmission shaft (5), a holder (15) inserted into the head of the main drive shaft (14) and having a cutting tool attached thereto, a spherical bearing (4) supporting the outer side of the main drive shaft (14) so that the main drive shaft (14) can be tilted, a center steel ball (7) clamped between the recess of the head of the transmission shaft (5) and the opposite recess of the rear end of the main drive shaft (14), and an axial steel ball (10) disposed in the long groove (11) of the outer surface of the head of the transmission shaft (5) and in the hole (18) of the main drive shaft (14).

Description

Technical Field

[0001] The present invention relates to a machining tool, and more specifically, to a machining tool suitable for a retainer of a deburring tool, by which wear of sliding parts can be significantly reduced. Background Technology

[0002] The applicant of this invention disclosed a processing tool for removing burrs in Patent Document 1 (Japanese Unexamined Patent Application No. 2005-349549). Figure 5 Figure 9, corresponding to Patent Document 1, illustrates a second embodiment of the patent document. Figure 5 The machining tool shown has a universal joint rod 3 installed inside the tool. Figure 5 In this example, the housing covering the outside of the spherical bearing is omitted. Figure 6 It shows Figure 5 The diagram shows the internal structure of the conventional main drive shaft 14 and retainer 15 in an inclined state. (Refer to...) Figure 6 The operation of the machining tool allows the universal joint rod 3 to tilt 3° to the upper right side in the figure, while the main drive shaft 14 and the retainer 15 can tilt 5° to the lower right side in the figure. Figure 7 (a) and Figure 7 (b) Photographs of new and worn parts of the conventional universal joint lever 3 are shown. Reference Figure 7 (b) The pin 1 protruding from the universal joint rod 3 wears due to friction with the pin groove 2. Figure 7 Compared to the new sales in (a), Figure 7 The tip of pin 1 in (b) is severely worn. This wear will cause the tilting action of the machining tool to be less smooth and will result in the inability to transmit driving force, which is the primary function of the machining tool. This necessitates early replacement of the joint, although the replacement time depends on the load.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Unexamined Patent Application No. 2005-349549

[0006] Technical issues

[0007] The present invention was proposed to solve the above-mentioned problems, and the object of the present invention is to provide a machining tool that will hardly cause wear at the joint between the main drive shaft and the transmission shaft even if the main drive shaft is tilted. Summary of the Invention

[0008] The present invention provides a machining tool comprising an upper shaft (6) to be attached to a host device for transmitting torque, a drive shaft (5) inserted into the upper shaft (6) to extend along the axis of the upper shaft (6), a main drive shaft (14) to be attached to the head of the drive shaft (5), a retainer (15) to be inserted into the head of the main drive shaft (14) and to which a cutting tool (9) is attached, a spherical bearing (4) supporting the outer side of the main drive shaft (14) so ​​that the main drive shaft (14) can be tilted, a central steel ball (7) sandwiched between a recess at the center of the head of the drive shaft (5) and a corresponding recess at the rear end center of the main drive shaft (14), and an elongated groove (11) provided on the outer surface of the head of the drive shaft (5) and a plurality of axial steel balls (10) provided in a hole (18) of the main drive shaft (14).

[0009] The machining tool also includes a spring (12) that biases the drive shaft (5) in the axial direction, wherein the center (8) of the central steel ball (7) is positioned offset from the center (13) of the spherical bearing (4) toward the cutting tool (9).

[0010] Beneficial technical effects of the present invention

[0011] The machining tool of the present invention includes a central steel ball sandwiched between a recess at the center of the head of the drive shaft and a recess at the center of the rear end of the main drive shaft, and a plurality of axial steel balls fitted into a long groove in the drive shaft and a hole in the main drive shaft. Since the central and axial steel balls reduce friction at the joint between the drive shaft and the main drive shaft even when the main drive shaft is tilted, the machining tool of the present invention can reduce wear at the joint. The machining tool of the present invention eliminates the need for a universal joint rod because of the central and axial steel balls installed in the drive shaft and the main drive shaft. This structure allows the retainer to tilt relative to the drive shaft at a predetermined angle together with the main drive shaft.

[0012] Because the center of the central steel ball is positioned offset from the center of the spherical bearing towards the cutting tool, the transition of the main drive shaft from an inclined state to an unloaded state allows the central axis of the transmission shaft to be linearly aligned with the central axis of the main drive shaft. A spring applies pressure to the transmission shaft, the central steel ball, and the main drive shaft, ensuring that the central axis of the transmission shaft is linearly aligned with the central axis of the main drive shaft. Attached Figure Description

[0013] Figure 1 An internal structural diagram of the processing tool of the present invention is shown;

[0014] Figure 2 It shows Figure 1 Internal structure diagram showing the main drive shaft and retainer in an inclined state;

[0015] Figure 3 The drive shaft and main drive shaft are shown, wherein, as Figure 1 As shown, the drive shaft will be inserted into the main drive shaft;

[0016] Figure 4 (a) shows an enlarged internal view of the spherical bearing, wherein, Figure 1 The main drive shaft and retainer shown are tilted, and, Figure 4 (b) shows the arrangement of the axial steel balls;

[0017] Figure 5 A diagram showing the internal structure of a traditional machining tool is provided.

[0018] Figure 6 It shows Figure 5 The diagram shows the internal structure of the conventional main drive shaft and retainer in an inclined state; and

[0019] Figure 7 (a) shows a photograph of the new traditional universal joint rod. Figure 7 (b) shows a photograph of a worn part of a conventional universal joint rod. Detailed Implementation

[0020] Example

[0021] The processing tool of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] Figure 1 An internal structural diagram of the machining tool 100 of the present invention is shown. An upper shaft 6 is configured to be detachably attached to a main unit, such as a machine tool or robot, through which torque is transmitted. A drive shaft 5 is inserted into the upper shaft 6 to extend along its axis. A main drive shaft 14 is connected at its rear end to the head of the drive shaft 5, and a retainer 5 is attached to the head of the main drive shaft 14. A cutting tool 9 is attached to the head of the retainer 15. A spherical bearing 4 is configured to support the outer side of the main drive shaft 14 such that the main drive shaft 14 is tiltable. A cover (not shown) is provided surrounding the portion from the upper shaft 6 to the spherical bearing 4.

[0023] Figure 2 It shows Figure 1The diagram shows the internal structure of the main drive shaft 14 and retainer 15 in an inclined state. The main drive shaft 14 and retainer 15 are inclined at approximately 5°. The inclined axis 17 of the main drive shaft 14 and retainer 15, shown in dashed lines, is inclined at approximately 5° relative to the central axis 16 of the drive shaft 5, also shown in dashed lines. Recesses are provided at the center of the head of the drive shaft 5 and the center of the rear end of the main drive shaft 14. A central steel ball 7 is positioned between the recesses of the drive shaft 5 and the opposing recesses of the main drive shaft 14. An elongated groove 11 is provided on the outer surface of the head of the drive shaft 5, and a plurality of holes 18 are provided on the main drive shaft 14. A plurality of axial steel balls 10 are installed in the elongated groove 11 and the holes 18.

[0024] Figure 3 The drive shaft 5 and the main drive shaft 14 are shown, as follows: Figure 1 As shown, the drive shaft 5 is inserted into the main drive shaft 14. A central steel ball 7 and an axial steel ball 10 are disposed at the head of the drive shaft 5, but for convenience, this arrangement of the steel balls is merely an example. First, the central steel ball 9 is inserted into the drive shaft 5 at the position corresponding to the recess in the main drive shaft 14, and the axial steel ball 10 is inserted into the drive shaft 5 at the position corresponding to the hole 18 in the main drive shaft 14. Then, the drive shaft 5 is inserted into the main drive shaft 14, such that the central steel ball 7 is accommodated in the recess at the center of the head of the drive shaft 5, and the axial steel ball 10 is accommodated in the elongated groove 11 of the drive shaft 5.

[0025] Figure 4 (a) shows an enlarged internal view of the spherical bearing, wherein, Figure 1 The main drive shaft 14 and retainer 15 shown are in an inclined state; Figure 4 (b) shows a schematic diagram of the arrangement of the axial steel balls. The central steel ball 7 is positioned between a recess at the center of the head of the drive shaft 5 and a corresponding recess at the center of the rear end of the main drive shaft 14. The axial steel balls 10 are mounted on the outer surface of the drive shaft 5 and in the bore 18 of the main drive shaft 14. (See reference) Figure 4 (a) The center 8 of the central steel ball 7 is positioned offset from the center 13 of the spherical bearing toward the cutting tool 9. The transition of the main drive shaft 14 from the tilted state to the unloaded state ensures that the central axis of the transmission shaft 5 is linearly aligned with the central axis of the main drive shaft 14. This is because... Figure 2 The spring 12 shown biases the drive shaft 5 toward the cutting tool 9 in the axial direction, and the main drive shaft 14 is blocked by the housing (not shown) and cannot move toward the cutting tool 9. (Reference) Figure 4 (b) The axial steel balls 10 are arranged as six balls mounted on the outer surface of the drive shaft 5 and in the bore 18 of the main drive shaft 14. The number of axial steel balls 10 can be three to ten, and is not limited to six.

[0026] Industrial applicability

[0027] This invention significantly reduces wear caused by friction between the main drive shaft and the transmission shaft, thereby extending the service life of the machining tool and making the tool more suitable for deburring.

[0028] Explanation of reference numerals in the attached figures

[0029] 1. Sell

[0030] 2 Pin Grooves

[0031] 3 universal joint rods

[0032] 4 Spherical bearings

[0033] 5. Drive shaft

[0034] 6. Upper shaft

[0035] 7. Center steel ball

[0036] 8. The center of the central steel ball

[0037] 9 Cutting tools

[0038] 10 Axial Steel Balls

[0039] 11 Long slots

[0040] 12 springs

[0041] 13. Center of spherical bearing

[0042] 14 Main drive shaft

[0043] 15 Retainer

[0044] 16. Central Axis

[0045] 17 Inclined axis

[0046] 18 holes

[0047] 100 Machining tools.

Claims

1. A machining tool, comprising: The upper shaft (6) is attached to the main unit and transmits torque through it; A drive shaft (5) is inserted into the upper shaft (6) to extend along the axis of the upper shaft (6); The main drive shaft (14) is attached to the head of the drive shaft (5); A retainer (15) is inserted into the head of the main drive shaft (14) and a cutting tool (9) is attached thereto. A spherical bearing (4) supports the outer side of the main drive shaft (14) so ​​that the main drive shaft (14) is tiltable; A central steel ball (7) is sandwiched between a recess at the head center of the drive shaft (5) and a corresponding recess at the rear end center of the main drive shaft (14); and Multiple axial steel balls (10) are disposed in the long groove (11) on the outer surface of the head of the drive shaft (5) and in the hole (18) of the main drive shaft (14); The axial steel ball (10) is arranged on a straight line perpendicular to the inclined axis (17) which is the center line of the main drive shaft (14) and passes through the center of the spherical bearing (4).

2. The processing tool according to claim 1, characterized in that: It also includes a spring (12) that biases the drive shaft (5) in the axial direction, wherein the center (8) of the central steel ball (7) is positioned offset from the center (13) of the spherical bearing (4) toward the cutting tool (9).

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