Method for removing burrs from intersecting holes

Abstract

This method allows for reliable removal of burrs while reducing processing costs. [Solution] A method for removing burrs from an intersecting hole is a method for removing burrs 13 formed at the opening of the second hole in the first hole of an intersecting hole where a first hole 11 extending in a first direction X and a second hole 12 extending in a second direction Z2 intersecting the first direction and communicating with the first hole intersect, and includes the steps of: inserting a cylindrical jig 30 made of the same material as the base material in which the intersecting hole is formed into the second hole from outside the base material so that the tip 31 of the jig protrudes into the first hole; and while holding the jig that has protruded into the first hole, inserting a drill 21 used when drilling the first hole into the first hole to remove burrs formed when machining the second hole.

Description

Technical Field

[0001] The present invention relates to a method for removing burrs from intersecting holes.

Background Art

[0002] For example, after drilling an intersecting hole in which an opening of a second hole is formed on the inner surface of a first hole, there is a method of removing burrs generated at the opening of the second hole (see, for example, Japanese Patent Laid-Open No. 2000-254846). In this method, when inserting a deburring tool into the first hole, a pin having substantially the same diameter as the second hole is inserted into the second hole from the outside of the workpiece, thereby closing the opening of the second hole.

[0003] In the method described in Patent Document 1, the deburring tool is inserted into the first hole and advanced so that the deburring tool contacts the burr and the tip of the pin. The pin is pushed by the deburring tool and retreats. At this time, against the biasing force of the coil spring, the tip of the pin retreats to a position substantially coinciding with the inner peripheral surface of the first hole. In this method, the burr is removed by passing the deburring tool through the portion where the burr is generated.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention provides a method for removing burrs from intersecting holes that can reliably remove burrs while reducing processing costs.

Means for Solving the Problems

[0006] A method for removing burrs from an intersecting hole according to one aspect of the present invention is a method for removing burrs formed at the opening of a second hole within a first hole in an intersecting hole, where a first hole extending in a first direction intersects with a second hole extending in a second direction intersecting the first direction and communicating with the first hole, and includes the steps of: inserting a cylindrical jig made of the same material as the base material in which the intersecting hole is formed into the second hole from outside the base material, so that the tip of the jig protrudes into the first hole; and, while holding the jig that has protruded into the first hole, inserting the drill used to drill the first hole into the first hole to remove burrs formed when the second hole was processed. [Effects of the Invention]

[0007] According to one aspect of the present invention, burrs can be reliably removed while reducing processing costs. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view showing a workpiece in each step of a deburring method for intersecting holes according to one embodiment. [Figure 2] This is a cross-sectional view showing the jig protruding into the first hole. [Modes for carrying out the invention]

[0009] The following describes a method for removing burrs from intersecting holes according to an embodiment of the present invention. Figure 1 is a cross-sectional view showing the workpiece W in each step of the method for removing burrs from intersecting holes according to one embodiment. Figure 2 is a cross-sectional view showing the jig 30 protruding into the interior of the first hole 11. Figures 1 and 2 show mutually orthogonal X, Y, and Z axes. The X-axis direction is an example of a first direction. The Z2 direction shown in Figures 1(b) and 1(c) is an example of a second direction. The first and second directions may be other directions. The second direction is a direction intersecting the first direction.

[0010] Workpiece W may be, for example, an automobile part, and more specifically, an engine part. Workpiece W has a first hole 11 and a second hole 12 formed as intersecting holes. Workpiece W is not limited to automobile parts, as long as it has intersecting holes. Workpiece W may be any other machine part, and is not limited to engine parts.

[0011] The first hole 11 extends in the X-axis direction and penetrates the workpiece W. The second hole 12 extends in the Z2 direction and communicates with the first hole 11. At the connection between the second hole 12 and the first hole 11, the opening of the second hole 12 is formed on the inner circumferential surface of the first hole 11. When viewed in the Y-axis direction, the Z2 direction may be inclined with respect to the X-axis direction.

[0012] Figure 1(a) is a cross-sectional view showing the state in which the drill 21 is inserted into the first hole 11 of the workpiece W, and is a diagram showing the state after machining the first hole 11. As shown in Figure 1(a), the first hole 11 can be formed in the workpiece W by performing drilling using the drill 21. When drilling the first hole 11, the drill 21 is moved in the X-axis direction, and after the first hole 11 is machined, the drill 21 is withdrawn from the first hole 11.

[0013] Figure 1(b) is a cross-sectional view showing the state in which the drill 22 is inserted into the second hole 12 of the workpiece W, and is a diagram showing the state after machining the second hole 12. As shown in Figure 1(b), the second hole 12 can be formed in the workpiece W by performing drilling using the drill 22. When drilling the second hole 12, the drill 22 is moved in the Z2 direction, and after the second hole 12 is machined, the drill 22 is withdrawn from the second hole 12. The burrs 13 generated when the second hole 12 is formed protrude into the first hole 11.

[0014] In the deburring method, as shown in Figure 2, a cylindrical jig 30 is inserted into the second hole 12 from the outside of the base material of the workpiece W, and the tip 31 of the jig 30 is extended into the first hole 11. The outer diameter of the jig 30 is approximately the same as the inner diameter of the second hole 12. The difference in diameter between the outer diameter of the second hole 12 and the outer diameter of the jig 30 may be -0.05 mm. By inserting the jig 30 into the second hole 12, chips and burrs present in the second hole 12 are pushed out by the jig 30 and remain inside the first hole 11. The jig 30 can reliably fill the internal space of the second hole 12. The gap between the second hole 12 and the jig 30 is as small as possible to ensure the insertion of the jig 30.

[0015] The jig 30 is made of the same material as the workpiece W. The tip 31 of the jig 30 protrudes into the first hole 11. The shape of the tip 31 may be, for example, an arc shape that follows the inner circumferential surface of the first hole 11. The tip 31 may have any other shape. The jig 30 is held against the workpiece with the tip 31 protruding into the first hole 11. This maintains the state in which the tip 31 protrudes into the first hole 11.

[0016] Next, in the deburring method, as shown in Figure 1(C), while holding the jig that protrudes into the first hole 11, the drill 21 used to drill the first hole 11 is inserted into the first hole 11 to remove the burr 13 that was formed when the second hole 12 was machined.

[0017] In this step, the drill 21 used to form the first hole 11 may be used to drill the first hole 11. This allows the burrs present inside the first hole 11 to be removed. At this time, the tip 31 of the jig 30 protruding into the first hole 11 is also removed. Since the material of the jig 30 is the same as the base material of the workpiece W, it can be removed using the drill 21. The removed burrs 13 and the shavings from the jig 30 are removed from the first hole 11.

[0018] Since the outer diameter of the jig 30 is substantially the same as the inner diameter of the second hole 12, burr 13 cannot enter the gap between the inner peripheral surface of the second hole 12 and the outer peripheral surface of the jig 30. The jig 30 has a predetermined length and can be used multiple times. Although the tip 31 of the jig 30 is shaved off during one use, the jig 30 has a predetermined length so that it can be used multiple times.

[0019] According to such a method for removing burrs from the intersecting holes, the burrs can be removed using the same tool (drill 21) as the tool used when machining the first hole 11. Therefore, there is no need to prepare another tool to remove the burr 13. The burr 13 can be removed by applying the same machining conditions as in the process of machining the first hole 11. According to the method for removing burrs from the intersecting holes according to the present embodiment, the burr 13 of the intersecting holes can be removed while reducing the machining cost.

[0020] In the burr removal method, since the material of the jig 30 is the same as the material of the base material of the workpiece W, the burr 13 can be surely removed. If the jig 30 is harder than the base material of the workpiece W, it will become a machining load. If the jig 30 is softer than the base material of the workpiece W, the burr 13 will be buried in the jig 30 and the burr 13 cannot be removed. When the material of the jig 30 is the same as the material of the base material of the workpiece W, the chips at the tip 31 of the jig 30 are the same as the base material and can be processed as they are.

[0021] In the burr removal method, since the material of the jig 30 is the same as the material of the base material of the workpiece W, the burr 13 can be removed using the same machining equipment under the same machining conditions as when machining the first hole 11.

[0022] The burr removal method has a protruding structure of the tip 31 of the jig 30 into the first hole 11, and the jig 30 can be used multiple times. Thereby, the machining cost can be reduced.

[0023] In the burr removal method, the jig 30 may have a structure for fixing to the base material of the workpiece W. Thereby, the jig 30 can be fixed to the workpiece W, the safety during processing can be ensured, and defects such as damage to the workpiece W can be prevented.

[0024] In the burr removal method, the burr 13 can be removed using the drill 21 used for the first hole 11, and the tip portion 31 of the jig 30 after removing the burr 13 has a shape along the inner peripheral surface of the first hole 11. Therefore, it can efficiently fill the internal space of the second hole 12 and reduce the processing load by slightly protruding only in the direction (Z2 direction) in which the second hole 12 extends.

[0025] As described above, the preferred embodiments of the present invention have been described in detail. However, the present invention is not limited to these embodiments, and various modifications or changes are possible within the scope of the gist of the present invention described in the claims.

Explanation of reference numerals

[0026] 11…First hole, 12…Second hole, 13…Burr, 21…Drill, 22…Drill, 30…Jig, 31…Tip portion, W…Workpiece, X…X-axis direction (first direction), Y…Y-axis direction, Z…Z-axis direction, Z2…Z2 direction (second direction).

Claims

[Claim 1] A method for removing burrs from an intersection hole, wherein a first hole extending in a first direction and a second hole extending in a second direction intersecting the first direction and communicating with the first hole intersect, the first method for removing burrs formed in the opening of the second hole within the first hole. A step of inserting a cylindrical jig, made of the same material as the base material in which the aforementioned intersecting holes are formed, into the second hole from the outside of the base material, so that the tip of the jig protrudes into the inside of the first hole, A method for removing burrs from intersecting holes, comprising the step of inserting the drill used to drill the first hole into the first hole while holding the jig that protrudes into the first hole, and removing the burrs formed when the second hole was machined.

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