Deburring tool

Abstract

To provide a deburring tool capable of inhibiting an edge of a through-hole from being excessively chamfered while removing a burr formed at the edge thereof.SOLUTION: A deburring tool 10 comprises a punch portion 11 that is formed at a tip of the deburring tool 10, for blanking a burr 24A formed in an opposite opening 23, a bur-removing portion 12 that has a tapered shape having a circular outer diameter reducing as going toward a base end, for removing a blanked burr 24B in a state of abutting against an edge 23a of the opposite opening 23 of a through-hole 21, and a chamfering-inhibiting portion 14 that inhibits the edge 23a of the opposite opening 23 from being chamfered by the bur-removing portion 12, by contacting a sidewall 25 of the through-hole 21 in a state in which the bur-removing portion 12 is in contact with the edge 23a of the opposite opening 23 of the through-hole 21.SELECTED DRAWING: Figure 3

Description

Technical Field

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[0001] The present invention relates to a deburring tool for suitably removing burrs formed in through-holes of cast products.

Background Art

[0002] Conventionally, when trying to provide a through-hole in a cast product during casting, burrs may be formed so as to block the through-hole. Such burrs are called film burrs and are removed with a deburring tool. For example, in Patent Document 1, as a tool for removing such burrs, a deburring device (deburring tool) that removes burrs by rotating from the side of the through-hole where burrs occur while tilting at a predetermined angle with respect to the rotation axis has been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when removing burrs with the deburring tool shown in Patent Document 1, since the deburring tool is pressed against the edge of the through-hole where burrs occur while tilting the deburring tool with respect to the central axis of the through-hole, the edge of the through-hole may be excessively chamfered.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a deburring tool that can suppress excessive chamfering of the edge while removing burrs formed on the edge of the through-hole.

Means for Solving the Problems

[0006] In view of the above problems, the deburring tool according to the present invention is a deburring tool for removing burrs formed in through holes of castings, and comprises a punching portion formed at the tip of the deburring tool, which punches out the burr formed in the other opening of the through hole by inserting the tip portion from one opening of the through hole toward the other opening of the through hole, and a position adjacent to the punching portion at the base end of the deburring tool, which has a circular cross-sectional shape perpendicular to the longitudinal direction of the deburring tool, and which extends toward the base end, and The deburring tool is characterized by comprising: a deburring section having a tapered shape with a reduced diameter, which removes punched-out burrs while in contact with the edge of the other opening of the through hole; and a chamfering suppression section provided at a position spaced apart from the deburring section, on the base end side of the deburring tool than the deburring section, which has a cylindrical shape with a circular cross-section perpendicular to the longitudinal direction, which suppresses chamfering of the edge of the other opening by the deburring section by contacting the side wall of the through hole while the deburring section is in contact with the edge of the other opening of the through hole. [Effects of the Invention]

[0007] According to the present invention, by inserting the punching portion formed at the tip of the deburring tool from one opening of the through hole of a casting toward the other opening of the through hole, the burr formed at the other opening can be punched out. Next, by moving the deburring portion along the edge of the other opening of the through hole while keeping it in contact with the edge of the other opening of the through hole, the punched-out burr can be removed. At this time, the chamfer suppression portion contacts the side wall of the through hole, thereby suppressing chamfering of the edge of the other opening by the deburring portion. As a result, it is possible to remove the burr formed at the edge of the through hole while preventing excessive chamfering of the edge. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram illustrating a deburring tool according to an embodiment of the present invention and a casting from which burrs have been removed by the deburring tool. [Figure 2] Figure 1 is a schematic diagram illustrating the state after burrs have been punched out using the deburring tool shown. [Figure 3] Figure 1 is a schematic diagram illustrating the removal of burrs using the deburring tool shown. [Modes for carrying out the invention]

[0009] Hereinafter, a deburring tool according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0010] 1. About deburring tool 10 As shown in Figure 1, the deburring tool 10 according to this embodiment is a tool for removing burrs formed in the through hole 21 of the casting 20. When attempting to create a through hole in the casting 20 during casting, burrs (film burrs) 24A may be formed to block the through hole 21, and these burrs 24A are removed with the deburring tool 10.

[0011] As shown in Figures 1 and 2, the deburring tool 10 has a punching section 11, a deburring section 12, a relief section 13, and a chamfer suppression section 14 formed on the shaft body 15, starting from the tip. The shaft body 15 is attached to a drive device (not shown) at its base end via a tool mounting jig (not shown).

[0012] The drive unit, along with the tool mounting jig, includes a linear motion mechanism (not shown) that moves the deburring tool 10 forward and backward relative to the through hole 21, and a pivot mechanism (not shown) that rotates the deburring tool 10 along the edge 23a of the other opening 23 of the through hole 21. By selecting these mechanisms and activating the drive source (not shown) of the drive unit for the selected mechanism, the linear motion and pivot motion of the deburring tool 10 can be selectively performed.

[0013] As shown in Figures 1 and 2, the punching portion 11 punches out the burr 24A formed in the other opening 23 of the through hole 21 of the casting 20 by inserting its tip through one opening 22 towards the other opening 23 of the through hole 21. The punching portion 11 is formed at the tip of the deburring tool 10, and its cross-sectional shape perpendicular to the longitudinal direction of the deburring tool 10 is circular, with a tapered tip that is a frustoconical portion. The size of the punching portion 11 is not particularly limited as long as it is smaller than the diameter of the through hole 21 and large enough to punch out the burr 24A.

[0014] As shown in Figures 2 and 3, the deburring section 12 removes the punched-out burr (return burr) 24B while in contact with the edge 23a of the other opening 23 of the through hole 21. The deburring section 12 is located adjacent to the punching section 11, on the base end side of the deburring tool 10. The deburring section 12 has a circular cross-sectional shape perpendicular to the longitudinal direction of the deburring tool 10, and its outer diameter decreases as it moves towards the base end, resulting in a tapered shape.

[0015] As shown in Figure 3, the chamfer suppression portion 14 suppresses chamfering of the edge 23a of the other opening 23 by the deburring portion 12 by contacting the side wall 25 of the through hole 21 when the deburring portion 12 is in contact with the edge 23a of the other opening 23 of the through hole 21. Specifically, the chamfer suppression portion 14 is provided at a position spaced apart from the deburring portion 12, on the base end side of the deburring tool 10, and has a cylindrical shape with a circular cross-section perpendicular to the longitudinal direction, and comes into contact with the side wall 25 of the through hole 21 when removing burrs 24B.

[0016] The relief portion 13 is formed between the deburring portion 12 and the chamfer suppression portion 14, and is the portion that is not in contact with the side wall 25 of the through hole 21 when the chamfer suppression portion 14 is in contact with the side wall 25 of the through hole 21. The relief portion 13 is formed such that its diameter decreases as it moves from the chamfer suppression portion 14 side toward the deburring portion 12 side. By providing such a relief portion 13, the deburring portion 12 can be brought into contact with the edge 23a of the other opening 23 of the through hole 21 while the chamfer suppression portion 14 is in contact with the side wall 25 of the through hole 21.

[0017] 2. Deburring method using deburring tool 10 In this embodiment, as shown in Figures 1 and 2, the punching portion 11 formed at the tip of the deburring tool 10 is inserted from one opening 22 of the through hole 21 of the casting 20 toward the other opening 23 of the through hole 21. This allows the burr 24A formed in the other opening 23 to be punched out.

[0018] Next, as shown in Figures 2 and 3, the burr removal unit 12 can be brought into contact with the edge 23a of the other opening 23 of the through hole 21, and the burr removal unit 12 can be moved (rotated) along the edge 23a of the other opening 23 to remove the punched-out burr 24B.

[0019] Furthermore, at this time, the burr 24B can be removed by simply rotating the deburring tool 10 without rotating it around its axis. In this way, by inserting the deburring tool 10 into the through hole 21 from one direction and rotating it, the process from punching out the back burr (burr 24A), which is a film burr, to removing the resulting burr (burr 24B) can be easily performed, thus suppressing the increase in the deburring cycle time.

[0020] At the timing of removing the burrs 24B, the chamfer suppressing portion 14 contacts the side wall of the through hole 21, so that the positional relationship between the burr removing portion 12 and the edge portion 23a of the other opening 23 is kept constant. Thereby, chamfering of the edge portion 23a of the other opening 23 by the burr removing portion 12 is suppressed. As a result, while removing the burrs 24A and 24B formed on the edge portion 23a of the other opening 23 of the through hole 21, it is possible to suppress excessive chamfering of the edge portion 23a. As a result, the machining accuracy of the edge portion 23a of the other opening 23 of the through hole 21 can be improved.

Explanation of Signs

[0021] 10: Burr removal tool, 11: Punching portion, 12: Burr removing portion, 14: Chamfer suppressing portion, 20: Casting, 21: Through hole, 22: One opening, 23: Other opening, 23a: Edge portion, 24A, 24B: Burr

Claims

[Claim 1] This is a deburring tool for removing burrs formed in through holes of castings. The deburring tool has a shaft body, and along the longitudinal direction of the deburring tool, from the tip to the base end, the shaft body is formed in the following order: punching portion, deburring portion, relief portion, and chamfer suppression portion. The punching portion is formed at the tip of the deburring tool and is the portion that punches out the burr formed in the other opening of the through hole by inserting the tip through one opening of the through hole toward the other opening of the through hole. The punched portion has a circular cross-sectional shape perpendicular to the longitudinal direction, and a frustoconical portion that tapers to a point. The deburring section is a part that, while in contact with the edge of the other opening of the through hole, removes burrs punched out by the punching section by simply rotating the deburring tool along the edge of the other opening, without rotating the deburring tool around its axis, and also chamfers the edge of the other opening along its circumference. The deburring section is provided adjacent to the punched section, has a circular cross-sectional shape perpendicular to the longitudinal direction, and has a tapered shape in which the outer diameter of the circle decreases as it proceeds toward the base end. The chamfer suppression portion is a portion that suppresses chamfering of the edge of the other opening by the burr removal portion by contacting the side wall of the through hole when the burr removal portion is in contact with the edge of the other opening of the through hole. The chamfer suppression portion is located on the base end side of the deburring tool, closer to the deburring portion than the deburring portion, and is cylindrical in shape with a circular cross-section perpendicular to the longitudinal direction. The inclined surface of the tapered deburring portion is located at a position where the circumferential surface of the cylindrical chamfer suppression portion is extended along the longitudinal direction. The relief portion is formed between the deburring portion and the chamfer suppression portion, and is a portion that is in a non-contact state with respect to the side wall when the chamfer suppression portion is in contact with the side wall of the through hole. The relief portion is adjacent to the chamfer suppression portion and the deburring portion, and is formed such that its diameter decreases as it moves from the chamfer suppression portion side to the deburring portion side, in a deburring tool.

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