Tool bracket

Abstract

To provide a tool bracket to which a spindle body is inserted, and in which the spindle body can tilt smoothly.SOLUTION: A tool bracket 10 comprises: a housing 15 with a cylinder chamber 15a extending in a cylinder axis 2 direction; a tilt body 17 which has a tilt axis 3 tilting with a tilt center 17e as the center, and to which the spindle body 11 is fitted, and which is capable of tilting relative to the cylinder axis 2; a whirl-stop body 19b which extends in a radial direction from the tilt axis 3 and is arranged on the tilt body 17; and a reception groove 19a which extends along the cylinder axis 2 direction and is arranged in the housing 15.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a tool bracket.

Background Art

[0002] A deburring tool that can tilt the tool has been proposed (Japanese Patent Application Laid-Open No. 2022-074292; hereinafter, Patent Document 1). The deburring tool 100 of Patent Document 1 includes a housing 1 having a shank 11 arranged along a shank axis 15, a transmission rod 3, a tilt shaft 4, and a tilt correction mechanism 9. The tilt shaft 4 has a flange portion 41, a receiving portion 41a through which the transmission rod passes, a rod portion 42 that holds a cutting tool 101, and a spherical bush 24 having a tilt center 25 on the shank axis 15. The tilt shaft 4 can tilt about the tilt center 25.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The deburring tool of Patent Document 1 is mounted on a rotating spindle such as a machining center. Therefore, the deburring tool of Patent Document 1 cannot be applied to, for example, a robot that does not have a rotating spindle. An object of the present invention is to provide a tool bracket into which a spindle body is inserted and the spindle body can tilt smoothly.

Means for Solving the Problems

[0004] A first aspect of the present invention is a housing having a cylinder chamber extending in the cylinder axis direction, a tilt body having a tilt axis that tilts about a tilt center, on which a spindle body is mounted and which is tiltable with respect to the cylinder axis, a detent body that extends radially from the tilt axis and is disposed on the tilt body, a receiving groove that extends along the cylinder axis direction and is disposed in the housing, and is a tool bracket.

[0005] A second aspect of the present invention is, A housing having a cylinder chamber extending in the direction of the cylinder axis, A piston that is biased toward the tip by a compressible fluid and reciprocates within the cylinder chamber, the piston having an action part located at the tip, A tilting body having a tilting axis, positioned within the cylinder chamber and tiltable relative to the cylinder axis, having a centering portion positioned at its base end and in contact with the working portion, the centering portion pushing out the piston with the cylinder axis as the line of action when the tilting axis is tilted from the cylinder axis, It is a tool bracket having [a certain feature]. [Effects of the Invention]

[0006] According to the tool bracket of the present invention, a spindle body can be inserted and the spindle body can tilt smoothly. [Brief explanation of the drawing]

[0007] [Figure 1] Longitudinal cross-sectional view of the deburring tool in Embodiment 1 when not tilted. [Figure 2] Sectional view along line II-II in Figure 1 [Figure 3] Enlarged view of part III in Figure 2 [Figure 4] Longitudinal cross-sectional view of the deburring tool in the tilted state of Embodiment 1 [Figure 5] Figure 4: Cross-sectional view along line VV [Modes for carrying out the invention]

[0008] <Embodiment 1> As shown in Figure 1, the deburring tool 10 of this embodiment includes a tool bracket 13 and a spindle body 11. Figure 1 is a cross-sectional view taken along line II of Figure 2. Figure 1 shows the spindle body 11 in a state where it is not tilted. In Figure 1, the cylinder axis 2 (see Figure 4) and the tilt axis 3 (see Figure 4) coincide. The deburring tool 10 is connected to the robot 6 and the air source 8.

[0009] The tool bracket 13 includes a housing 15, a piston 21, a tilting body 17, a coupling 18, an anti-rotation device 19, a base end cover 27, and a tip cover 25. The housing 15 is hollow. Inside the housing 15, from the base end, the piston 21, the tilting body 17, and the anti-rotation device 19 are arranged.

[0010] The housing 15 has, in order from the base end, a cylinder chamber 15a, a seating surface 15c, and a tip opening 15d. The housing 15 is attached to the tip of the arm of a robot 6, for example. As shown in Figure 2, the housing 15 may have a rectangular parallelepiped shape. The cylinder chamber 15a is positioned around the cylinder axis 2. As shown in Figure 1, the cylinder chamber 15a has a cylinder portion 15a2 and a small-diameter guide portion 15a1. The cylinder portion 15a2 is positioned in the center of the housing 15. The small-diameter guide portion 15a1 has a smaller diameter than the cylinder portion 15a2. The small-diameter guide portion 15a1 is connected to the cylinder portion 15a2 and opens at the base end of the housing 15. The seating surface 15c is positioned at the tip of the housing 15. The seating surface 15c is a plane perpendicular to the cylinder axis 2. The seating surface 15c is connected to the cylinder chamber 15a via a rotation stopper 19. The tip opening 15d opens from the seat surface 15c to the tip of the housing 15. Preferably, the diameter of the tip opening 15d increases towards the tip.

[0011] The housing 15 has a fluid port 15f. The fluid port 15f is connected to the cylinder section 15a2. The fluid port 15f is connected to an air source 8. The air source 8 supplies compressed air to the cylinder section 15a2 via the fluid port 15f.

[0012] The piston 21 is hollow cylindrical. The piston 21 has a head portion 21b, a sleeve 21a, a recess (working portion) 21d, a base end opening 21c, a seal 21e, and a seal 21f. The head portion 21b is a hollow cylinder and reciprocates within the cylinder portion 15a2. The recess 21d increases in diameter as it progresses towards the tip. The recess 21d is, for example, a conical surface centered on the cylinder axis 2. The sleeve 21a is connected to the base end of the head portion 21b. The sleeve 21a is guided by the small diameter guide portion 15a1. The base end opening 21c is the inner surface of the sleeve 21a. The base end opening 21c may be a conical surface that increases in diameter as it progresses towards the base end. The base end opening 21c is connected to the recess 21d. The seal 21e is mounted on the outer cylindrical surface of the head portion 21b. The seal 21f is attached to the outer cylindrical surface of the sleeve 21a.

[0013] The tilting body 17 is hollow cylindrical or spherical. The tilting body 17 has a convex spherical surface (centering portion) 17a, a head surface 17b, a sleeve 17c, and an insertion hole 17d. The convex spherical surface 17a is located at the base end of the tilting body 17. The convex spherical surface 17a abuts against and slides against the recess 21d. The convex spherical surface 17a has a tilting center 17e. The tilting center 17e is the center of the convex spherical surface 17a. The tilting axis 3 passes through the tilting center 17e. The head surface 17b is located at the tip of the tilting body 17. The head surface 17b is, for example, a plane. The plane head surface 17b is perpendicular to the tilting axis 3. The sleeve 17c extends from the head surface 17b toward the tip. The sleeve 17c is hollow straight cylinder. The through hole 17d is on the inner surface of the sleeve 17c. The through hole 17d is centered on the tilting shaft 3 and penetrates the tilting body 17. The through hole 17d is a cylindrical hole.

[0014] The spindle body 11 is inserted into the insertion hole 17d. The spindle body 11 penetrates the tool bracket 13. The spindle body 11 has a body 11a, a spindle 11b, and a spindle motor 11c. The spindle 11b is rotatably supported by the body 11a about the tilting axis 3. A tip tool 1 is attached to the spindle 11b. The spindle motor 11c is disposed on the body 11a and connected to the spindle 11b. For example, the spindle motor 11c rotates the spindle 11b in the rotational direction 5 (counterclockwise as viewed from the tip direction).

[0015] The coupling 18 is hollow cylindrical. The coupling 18 fastens the sleeve 17c and the spindle body 11. The coupling 18 is, for example, a rigid coupling.

[0016] As shown in FIGS. 1 to 3, the rotation stopper 19 has a plurality of receiving grooves 19a, a plurality of rotation stopper pins 19b, and pin holes 19c. The plurality of receiving grooves 19a are arranged rotationally symmetrically with respect to the cylinder shaft 2 in the inner diameter portion of the housing 15. Each receiving groove 19a is an angular groove extending parallel to the cylinder shaft 2 and has a rectangular cross section. The contact surface 19a1 is the side surface of the receiving groove 19a on the opposite side of the rotational direction 5. The contact surface 19a1 is a plane passing through the cylinder shaft 2.

[0017] The plurality of pin holes 19c are arranged in the tilting body 17. Each pin hole 19c passes through the tilting center 17e and extends parallel to the contact surface 19a1 on a plane perpendicular to the tilting axis 3. The pin hole 19c is a cylindrical hole. The rotation stopper 19 has the same number of rotation stopper pins 19b as the receiving grooves 19a. The plurality of rotation stopper pins 19b are arranged rotationally symmetrically with respect to the tilting axis 3. The rotation stopper pin 19b has a shaft portion 19b1 and a bulging portion 19b2. The shaft portion 19b1 is inserted into the pin hole 19c. The bulging portion 19b2 protrudes radially from the tilting body 17. A clearance (gap) is provided between the bulging portion 19b2 and the receiving groove 19a. Preferably, the rotation stopper pin 19b has a contact spherical surface 19b3.

[0018] The base end cover 27 covers the space between the base end face of the housing 15 and the spindle body 11. The base end cover 27 suppresses the entry of foreign matter, cutting coolant, etc. between the cylinder chamber 15a, the base end opening 21c, and the spindle body 11.

[0019] The tip cover 25 covers the space between the tip face of the housing 15 and the spindle body 11 or the coupling 18. The tip cover 25 suppresses the entry of foreign matter, cutting coolant, etc. between the spindle body 11 and the tip opening 15d.

[0020] [[ID=⑧]]Referring to FIGS. 1 to 5, the usage state of the burr removal tool 10 will be described. FIGS. 4 and 5 show the situation where the burr removal tool 10 is performing burr removal on the workpiece 7. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 5. As shown in FIGS. 4 and 5, the workpiece 7 has a burr 7a. Here, the two-dot chain line of the burr 7a in FIG. 5 indicates the shape of the removed part. The side surface of the workpiece 7 has a convex curved surface facing the burr removal tool 10 when viewed from the base end direction along the cylinder axis 2. The burr 7a protrudes from the side surface of the workpiece 7. The spindle 11b rotates in the rotation direction 5. The air source 8 supplies compressed air to the cylinder chamber 15a.

[0021] As shown in FIG. 1, when the tip tool 1 is separated from the workpiece 7, the tip tool 1 is not subjected to a large moment load F1 (see FIG. 4). The piston 21 moves toward the tip by the compressed air supplied to the cylinder chamber 15a. At this time, the head surface 17b abuts against the seat surface 15c. Thereby, the tilting of the spindle body 11 is suppressed. And the tilting axis 3 substantially coincides with the cylinder axis 2. At this time, since the head surface 17b and seat surface 15c are flat, so the tilting axis 3 is likely to be stable.

[0022] When the spindle 11b starts to rotate, the spindle body 11 also tries to rotate. As shown in FIG. 3, the bulging portion 19b2 of the anti-rotation pin 19b abuts against the contact surface 19a1 of the receiving groove 19a, suppressing the rotation of the spindle body 11.

[0023] Next, the tip tool 1 is brought into contact with the workpiece 7 to deburr it. As shown in Figure 5, the robot 6 moves the housing 15 along a straight trajectory 41 from position 15p to position 15q. Then, as shown in Figures 4 and 5, the spindle body 11 tilts, and the tip tool 1 moves from position 1p to position 1q, tracing a trajectory 42 that follows the shape of the side surface of the workpiece 7. The tip tool 1 shaves off the burr 7a.

[0024] As shown in Figure 4, when a moment load F1 acts on the tip tool 1, the tilting body 17 and the spindle body 11 attempt to tilt together around a point 43 on the circumference of the head surface 17b. Then, with the convex spherical surface 17a in contact with the recess 21d, it pushes the piston 21 upward towards the base end. At this time, the tilting body 17 tilts while the convex spherical surface 17a slides against the recess 21d. The tilting center 17e moves towards the base end along the cylinder axis 2. The recess 21d has a circular cross-section centered on the cylinder axis 2. Therefore, the convex spherical surface 17a and the recess 21d are in contact substantially around the entire circumference. The tilting body 17 pushes the piston 21 upward along the cylinder axis 2, with the tilting center 17e as the point of action. That is, the biasing force F2 that the tilting body 17 exerts on the piston 21 has the cylinder axis 2 as its line of action. Air is a compressible fluid. Therefore, the piston 21 can move toward the base end against the pressure of the compressed air supplied to the piston chamber. Since the piston 21 receives a biasing force F2 along the cylinder axis 2, the tilting of the piston 21 is suppressed. Therefore, the piston 21 can move smoothly along the cylinder axis 2. Furthermore, the piston 21 biases the tilting body 17 toward the tip due to the pressure of the compressed air. Therefore, the tilting body 17 maintains contact with the seating surface 15c.

[0025] As the tilting shaft 3 tilts away from the cylinder shaft 2, the bulging portion 19b2 and the receiving groove 19a come into contact with each other while twisting. In this embodiment, since the contact spherical surface 19b3 makes point contact with the contact surface 19a1, the contact resistance between the bulging portion 19b2 and the receiving groove 19a is small. Therefore, the tilting body 17 can tilt smoothly.

[0026] The operator teaches the robot 6 to determine the trajectory 41 and speed of the deburring tool 10. Preferably, the robot 6 is taught when the tilt axis 3 substantially coincides with the cylinder axis 2. As mentioned above, the head surface 17b contacts the seat surface 15c, which helps stabilize the posture of the spindle body 11. Therefore, it is easier for the operator to teach the robot 6. In addition, because the posture of the tilt axis 3 is stable when the robot 6 moves the deburring tool 10, contact between the deburring tool 10 and the workpiece 7, safety fence, or operator is suppressed.

[0027] The present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. All technical matters included in the technical concept described in the claims are covered by the present invention. The embodiments described above are preferred examples, but those skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed herein, and these are included in the technical scope described in the appended claims. [Explanation of symbols]

[0028] 1 Tip tool 2 Piston shafts 3 Tilt axis 7. Object 11 Spindle Body 13 Tool Brackets 15 Housing 15a Cylinder chamber 17. Tilting Body 17e Tilt center 19a Receptor groove 19b Anti-rotation body 21 pistons 21d Working part

Claims

1. A tool bracket, A housing having a cylinder chamber extending in the direction of the cylinder axis, A tilting body having a tilting axis that tilts around a tilting center, and which is tiltable relative to the cylinder axis, A rotation-preventing body extending radially from the tilting axis and positioned on the tilting body, A receiving groove extending along the cylinder axis, positioned in the housing, and engaging with the anti-rotation body, A tool bracket having, A spindle body that is inserted so as to penetrate the tool bracket, A spindle to which a cutting tool can be attached, A spindle motor for rotating the aforementioned spindle, A spindle body having, A deburring tool having the following features.

2. The anti-rotation body extends in a plane that passes through the tilting center and is perpendicular to the tilting axis. The deburring tool according to claim 1.

3. The receiving groove has a contact surface that is a plane passing through the cylinder axis. A deburring tool according to claim 1 or 2.

4. The anti-rotation body has a bulge that contacts the contact surface, The deburring tool according to claim 3.

5. The bulging portion is spherical. The deburring tool according to claim 4.

6. It further comprises a piston having an action part positioned at the tip, which is biased toward the tip and reciprocates within the cylinder chamber, The tilting body is positioned inside the cylinder chamber and has a centering portion that contacts the working portion. A deburring tool according to claim 1 or 2.

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