JP2009039842A - Deburring tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deburring tool to remove burrs formed at an intersection part of a drill hole and a cross hole by facilitating the manufacturing of the tool by simplifying its structure, free to minutely adjust a diameter of the tool and free to stabilize a removing effect of the burrs. <P>SOLUTION: This deburring tool pushes and cuts the burrs by a cutting blade 6 by forming a slit (split groove) 7 on a part reaching the longitudinal midway of a shank 2 connected to a head piece from the head end of the head piece 3 having the cutting blade 6, providing an adjustment mechanism 4 of a tool diameter using an adjustment screw 4a at positions opposed to each other by sandwiching the slit 7 of the shank between them and inserting it in a hole at the inner surface on which the burrs are formed without rotating the tool. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, a hole having a circular cross section processed by using a rotary drilling tool (referred to as a drill hole in the present invention) and a hole drilled through the drill hole (referred to as a cross hole) are intersected. The present invention relates to a deburring tool for removing burrs generated in a part.

  An example of a situation where the drill hole and the cross hole intersect is shown in FIG. 6 is a drill hole processed prior to the workpiece W, and 11 is a cross hole provided through the drill hole 10. There may be one cross hole 11 or a plurality of cross holes 11 may be provided at different positions in the circumferential direction or the axial direction. In any case, when the cross hole 11 is provided by drilling after the drill hole 10 is machined, a burr 12 entering the drill hole 10 side is generated at the intersection of both holes.

  As conventional examples of deburring tools used for the purpose of removing the burrs, for example, there are those disclosed in Patent Documents 1 and 2 below. The deburring tool in each document has one or more cutting blades swelled in the radial direction on the outer peripheral portion of the tip, and the tip cutting blade portion that can be elastically deformed is reduced in diameter to be smaller than the tool diameter. Insert it into the cross hole. Then, when the cutting edge enters the drill hole intersecting the cross hole, the tool is rotated and pulled out from the cross hole. At this time, the cutting edge is pressed against the hole edge by the elastic restoring force of the cutting edge to cross the hole. And burr formed at the intersection of the drill hole (which protrudes inside the drill hole) is removed by cutting.

Note that the tool of Patent Document 1 is provided with a slit (vertical split groove) that enables the diameter of the cutting edge portion to be reduced by elastic deformation, and the same slit is also provided in Patent Document 2 to provide a cutting edge. The part whose diameter can be reduced is disclosed. Patent Document 2 also discloses a technique for adjusting the diameter of the cutting edge with a screw.
JP 2005-169517 A Special table 2007-506560

  In the deburring tool of Patent Document 1, the outer diameter of the cutting edge is made larger than the diameter of the cross hole where deburring is performed, and the diameter of the tool is reduced by pressure input. However, the tool diameter cannot be finely adjusted. Therefore, there is a problem that when the cutting edge is worn, the force for pressing the cutting edge against the hole edge fluctuates, and the burr removal effect is not stable. In addition, it is difficult to maintain the tool life over a long period of time because the worn and damaged cutting edges must be re-polished.

  The deburring tool of Patent Document 2 also has the same problem as described above. This patent document 2 also shows a tool that adjusts the tool diameter by changing the distance between two spring arms facing each other with a slit therebetween, but the rotating tool is caused by vibration during tool rotation. Since the screws are loosened, the tool diameter after adjustment is difficult to stabilize. In addition, since the tool diameter adjusting mechanism disclosed in Patent Document 2 cannot make the tool diameter larger than the initial maximum set diameter, the pressing force against the hole edge is reduced due to wear of the blade edge or the like. Sometimes this cannot be corrected, and the deburring effect varies as in the deburring tool of Patent Document 1.

  Furthermore, the deburring tools of these patent documents are not easy to manufacture because the cutting edge portion bulges to the outer periphery to form a complicated shape.

  The present invention eliminates the drawbacks of the above-described conventional tools, specifically, simplifies the structure, facilitates manufacture, enables fine adjustment of the tool diameter, and stabilizes the burr removal effect. It is an issue.

  In order to solve the above problems, in the present invention, a cylindrical head piece is joined to the tip of the shank portion, a cutting edge is formed by a ridge line on the outer periphery of the tip of the head piece, and the tip of the head piece A slit (split groove) that continuously divides the headpiece and the shank portion into two vertically is formed in a portion extending from the middle of the shank portion to the middle of the shank portion, and at a position facing the slit of the shank portion with the slit in between The deburring tool was configured by providing a tool diameter adjusting mechanism that can be operated from the outside and elastically deformed so that the two parts of the shank part are separated from each other to increase the tool diameter. And this tool was inserted without rotating in the hole which produced the burr | flash on the inner surface, and the burr was pushed out with the said cutting blade.

  In such a deburring tool, the shank part is preferably made of steel and the headpiece is preferably made of a material having a hardness higher than that of the shank part, for example, a cemented carbide. Also, two adjustment screws that can be rotated from the outside and whose ends are abutted with each other are screwed into positions facing each other with the slit in the shank portion interposed therebetween, and the adjustment mechanism for adjusting the tool diameter with the two adjustment screws Is also preferable. The tool diameter adjusting mechanism can be provided at a plurality of positions by shifting the position in the tool axis direction. The adjustment screw of this adjustment mechanism is preferably immersed in the shank portion.

  Since the deburring tool of the present invention is inserted into a hole having a burr on its inner surface without being rotated, and the burr is pushed out by a cutting blade at the tip of the head piece, the head piece may have a common cylindrical shape. The cutting edge can be constituted by the ridgeline on the outer periphery of the tip, and the structure is simple and can be manufactured easily, and the manufacturing cost can be greatly reduced.

  In addition, since the tool diameter adjusting mechanism is provided, the tool diameter can be finely adjusted and the burr can be reliably pushed by the cutting edge at the tip of the head piece. In addition, the fine adjustment mechanism elastically deforms the two parts of the tool so as to be separated from each other and increases the tool diameter, so that the tool diameter decreases due to wear and damage due to use. The tool diameter can be restored to the original by adjusting the diameter, and since the tool does not rotate, even if the adjustment mechanism is configured with screws, adjustment errors due to loose screws are unlikely to occur, and the burr removal effect is stably exhibited. To do.

  In addition, it is desired that the head piece serving as the cutting tool has excellent wear resistance, while the shank portion is desired to be elastically deformed without difficulty when adjusting the tool diameter. The shank part is made of steel with excellent toughness, and the headpiece is made of a material harder than steel (a cemented carbide is less expensive than other high-hardness materials). .

  In addition, an adjustment mechanism that does not complicate the adjustment mechanism and that adjusts the tool diameter with the two adjustment screws provided at opposite positions across the slit of the shank portion, and the adjustment operation also operates the screws. Just good and simple. In addition, the tool of the present invention improves the properties of the hole surface after processing by pressing the burr while elastically pressing the tip of the head piece against the inner surface of the drill hole, but it is also possible to adjust the pressing force at this time Become.

  In addition, if the screw for adjusting the tool diameter is immersed in the shank portion, the portion where the adjusting screw is installed can be inserted into the drill hole without any trouble, and deeper deburring of the drill hole becomes possible.

  In addition, if the tool diameter adjustment mechanism is shifted in the tool axis direction and provided in multiple locations, the radial adjustment allowance can be increased, and the adjustment range of the pressing force against the inner surface of the drill hole at the head piece tip is also Spreading and deburring work can be performed under optimum conditions.

  Furthermore, when the cutting edge wears down and the function of removing burrs is reduced, the conventional tool regrinds and regenerates the cutting edge. However, the tool of the present invention has a pressing force against the inner surface of the drill hole at the head piece tip. By increasing the size, the function of removing burrs that have been lowered can be recovered. This operation is performed several times, and re-polishing can be performed when wear has progressed to some extent, so that the number of function regenerations is increased compared to conventional tools, which is advantageous in terms of long-term maintenance of the tool life.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5 of the accompanying drawings. A deburring tool 1 shown in FIGS. 1 to 3 includes a shank portion 2, a head piece 3, and a tool diameter adjusting mechanism 4.

  The shank portion 2 is made of steel that can be smoothly elastically deformed, and a columnar head piece 3 made of cemented carbide and having no back taper is brazed and joined to the tip thereof. 5 is a brazing part of both. Here, the brazing portion 5 has a V-shaped fit between the shank portion 2 and the head piece 3 to be brazed, which is preferable because the joining area can be increased, but the shank portion 2 and the head piece 3 are It is not essential to fit the letters, but it is only preferable.

  The head piece 3 has a diameter (a diameter when the shank portion before the diameter adjustment is not elastically deformed) smaller than a hole diameter of a drill hole for deburring within a predetermined range. The diameter difference with the hole diameter of the drill hole becomes an adjustment allowance for the tool diameter by the adjusting mechanism 4. In the case of the tool of the example, it was preferable that the diameter D1 of the head piece 3 be small in the range of 0.01D to 0.04D with respect to the hole diameter D of the drill hole for deburring (see FIG. 6). However, the appropriate value varies depending on the diameter of the shank portion 2, the length of the slit 7, the depth of the drill hole for deburring, and the like.

  The cutting edge 6 is constituted by a ridgeline on the outer periphery of the tip with the tip of the head piece 3 being a surface perpendicular to the tool axis. Further, a slit 7 is formed in the portion extending from the tip of the head piece 3 to the middle of the shank portion 2 to divide the head piece 3 and the shank portion 2 into two continuously in the radial center of the tool. The aforementioned tool diameter adjusting mechanism 4 is provided in the middle of the length of the portion 2.

  The slit 7 is processed using a wire cut electric discharge machine. The slit 7 may be a split groove that can divide the head piece 3 and the shank portion 2 into two equal parts, and the width is not particularly required. If the slit 7 is formed by wire cutting after joining the head piece 3 to the shank portion 2, a slit having almost no width can be easily formed.

  The tool diameter adjusting mechanism 4 is provided with adjusting screws 4a at positions facing each other across the slit 7 of the shank portion 2, and the two adjusting screws 4a and 4a sandwich the slit 7 of the shank portion therebetween. There is provided a tool for changing the tool diameter by opening the divided part while elastically deforming the opposed part. Screw holes 4b and 4b that penetrate the two divided portions in the radial direction are provided opposite to each other at the position sandwiching the slit 7 of the shank portion 2, and the adjustment screws 4a and 4a are opposed to the screw holes 4b and 4b, respectively. Then, the tips of the adjusting screws are butted against each other at the central portion of the slit 7 (the bisecting point in the radial direction of the shank portion). Each adjustment screw 4a, 4a is immersed in the shank portion 2 using a flat-tip type set screw (so-called potato screw). These adjusting screws 4a and 4a have a rotation operation portion 4c such as a hexagonal hole at the rear portion (outer end in the tool radial direction), and can be rotated from the outside by a tool such as a hexagon wrench.

  The deburring tool 1 of FIG. 1 has a tool diameter adjusting mechanism 4 provided at one location of the shank portion 2, but the adjusting mechanism 4 is shifted in the tool axis direction as shown in FIG. May be provided. Of course, the plurality of adjusting mechanisms 4 are provided within a range in which the shank portion 2 is divided into two by the slit 7. The number of installation of the adjusting mechanism 4 is not particularly limited. However, as the number of installation increases, the labor of adjusting the tool diameter increases, so that it does not increase unnecessarily.

  The deburring tool 1 of the present invention is inserted into the drill hole without rotating along the outer periphery of the head piece 3 along the hole surface of the drill hole for deburring (the hole surface corresponding to the cross hole). And the burr | flash which has arisen in the crossing part of a drill hole and a cross hole is pushed and removed with the cutting edge 6 of the front-end | tip outer periphery of the head piece 3. FIG. Since the tool diameter adjusting mechanism 4 is provided, the work can be performed with the tool diameter sufficiently close to the hole diameter of the drill hole even when the tool is used repeatedly and the cutting edge portion is worn. If the drill hole is a hole with a chamfered chamfer or a chamfered chamfer at the edge of the inlet, the tool diameter is made larger than the drilled hole diameter by the adjusting mechanism 4 (the chamfered portion is inserted). It is also possible to remove the burrs by press-fitting into the drill hole while guiding the head piece 3 with the chamfered surface. According to this method, since the cutting edge 6 is pressed against the inner surface of the drill hole by the elastic restoring force of the shank portion 2, even when the hole diameter of the drill hole fluctuates within the tolerance, The influence is absorbed and the burr is removed well.

  When the tool diameter is enlarged by adjustment by the adjustment mechanism 4, a back taper is naturally formed on the outer periphery of the head piece 3. The back taper provides effects such as friction reduction.

  Since the deburring tool of the present invention is inserted into the drill hole without rotating and pushes out the burr, it is necessary to correctly determine the circumferential direction of the tool and hold it with the tool holder. If the deburring tool is not correctly mounted on the tool holder, the cutting edge will be correctly applied to the edge of the cross hole where the burr is generated (the work where the cross hole and the drill hole are positioned is positioned). Is not guaranteed. If the end portion of the slit 7 having no cutting edge hits the edge of the cross hole, the burr is left uncut, which is not preferable. Therefore, in the illustrated deburring tool, a positioning notch portion 2b is provided on the outer periphery of the grip portion 2a (portion held by the tool holder) of the shank portion 2, and a wedge (not shown) is driven into the tool holder (not shown). (This is also not shown) is engaged with the notch 2b so that the mounting posture with respect to the tool holder is made constant. When a wedge is driven into the notch 2b, it is possible to receive the axial force applied to the deburring tool at the time of machining with the wedge, but positioning of the deburring tool in the circumferential direction is performed using a key and a key groove. It is also possible to do this.

-Example-
Below, the more detailed Example of the deburring tool of this invention is given. A deburring tool (Example 1) having the structure shown in FIGS. 1 and 2 and a deburring tool (Example 2) having the structure shown in FIGS. 4 and 5 were prepared. In both tools, alloy steel such as SCM435 was adopted for the shank portion 2, and K type cemented carbide which is usually used for the headpiece 3 was adopted. The head piece 3 was brazed with a V-shape fitting at the tip of the shank portion 2.

In Example 1, the tool diameter adjusting mechanism 4 was provided at one location. The dimensions of the tool are as follows: the diameter of the head piece 3 is 6.8 mm, the length of the piece in the tool axis direction is 30 mm, the length of the slit 7 in the tool axis direction is 80 mm, and the adjusting screw 4a is M3 × 2. The distance from the head piece tip to the center of the adjustment screw is 40 mm.
In Example 2, the tool diameter adjusting mechanism 4 was provided at three locations. The dimensions of the tool are as follows: the head piece 3 has a diameter of 17.45 mm, the piece has a length of 30 mm, the slit 7 has a length in the tool axis direction of 105 mm, and three adjustment screws 4a: M4 × 2. The distance from the head piece tip to the center of each adjusting screw is 50 mm, 70 mm, 90 mm.

  Next, deburring of the inner surface of the drill hole drilled by the drill with a diameter of 7.0 mm with the prototype deburring tool of Example 1 was performed, and the diameter of φ17. Deburring of the inner surface of the drill hole drilled by an 8 mm drill was performed. The ratio {(D−D1) / D} of the difference between the diameter D1 of the drill hole and the diameter D1 of the headpiece 3 is about 0.028D in the processing with the tool of Example 1, and When machining with a tool, it is about 0.02D.

  As a result of this evaluation test, it was confirmed that burrs generated at the intersection of the drill hole and the cross hole could be stably removed. Also, when the tool diameter is slightly larger than the hole diameter of the drill hole and the tool is pressed into a drill hole with a chamfered chamfer at the entrance edge, the drill hole and cross The burr generated at the intersection of the holes could be removed stably.

The perspective view which shows one form of the deburring tool of this invention Side view of the deburring tool of FIG. FIG. 2 is an enlarged cross-sectional view of a portion along line III-III in FIG. The perspective view which shows the other form of the deburring tool of this invention Side view of the deburring tool of FIG. Sectional view showing an example of a drill hole with burr at the intersection with the cross hole

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Deburring tool 2 Shank part 2a Grasping part 2b Notch part 3 Headpiece 4 Tool diameter adjustment mechanism 4a Adjustment screw 4b Screw hole 4c Rotation operation part 5 Brazing part 6 Cutting edge 7 Slit 10 Drill hole 11 Cross hole 12 Burr W Work

Claims (5)

  A cylindrical head piece (3) is joined to the tip of the shank portion (2), and a cutting edge (6) is constituted by a ridgeline on the outer periphery of the tip of the head piece (3). Further, the head piece (3) A head piece (3) and a slit (7) for continuously dividing the head piece (3) and the shank part (2) into two vertically are formed in a part extending from the tip of the shank part (2) to the middle of the longitudinal direction. ) Of the tool diameter that increases the tool diameter by elastically deforming the two parts that can be operated from the outside and separated from each other at positions facing each other with the slit (7) in between. 4) A deburring tool that is provided so as to be inserted into a hole having a burr on its inner surface without rotation and to push the burr off with the cutting edge (6).   The deburring tool according to claim 1, wherein the shank part (2) is made of steel and the head piece (3) is made of a material having a hardness higher than that of the shank part.   Two adjustment screws (4a) which can be rotated from the outside and whose ends are abutted with each other are screwed into positions facing each other with the slit (7) of the shank part (2) in between, and the two adjustments The deburring tool according to claim 1 or 2, wherein the tool diameter adjusting mechanism (4) is configured by a screw (4a).   The deburring tool according to claim 3, wherein the adjustment screw (4a) is provided so as to be immersed in the shank portion (2).   The deburring tool according to any one of claims 1 to 4, wherein the tool diameter adjusting mechanism (4) is provided at a plurality of positions while being shifted in the tool axis direction.

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