JPH0636754U - Polishing device for conical cutting tools - Google Patents

Abstract

(57) [Abstract] [Purpose] In order to match the deformed conical shape of a conical cutting tool, the tool is rotationally driven and moved forward and backward so that the cutting edge of the tool can be completely and efficiently polished. Provided is a polishing device. [Structure] A conical cutting tool K is gripped by a chuck rotating body 14 with the deformed conical portion 1 protruding, and is rotated by a handle operation to pivotally support the chuck rotating body on a support body 13. A guide pin 19 projecting from the peripheral surface of the chuck rotating body is provided on this support, and a groove cam portion 18 is provided along the peripheral surface of the chuck rotating body so that the projecting end of the guide pin is engaged with the guide pin 19. The conical cutting tool gripped by the rotation is moved forward and backward so as to correspond to the cutting edge portion 7 of the conical portion, and the conical portion of the conical cutting tool is moved to the polishing body 22.
And the blade edge part that moves back and forth is polished.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a conical cutting tool for removing burrs generated on the peripheral surface of a hole such as a cutting hole provided in a workpiece, and more particularly to a polishing device for polishing the cutting edge of the tool.

[0002]

[Prior art]

 For example, a work piece such as a body is provided with a hole portion if necessary. Since the hole is cut with a tool such as a drill, burrs are easily formed along the peripheral edge of the end surface of the hole. It is not possible to leave the burr as it is in the post-process, so it must be removed. The cone-shaped cutting tool K described later is the most suitable tool for that purpose.

As shown in FIGS. 5 to 7 (A) and (B), this is a tapered portion whose tip has a deformed conical shape and whose diameter is also reduced from the rear end of this deformed conical portion 1. 2 and a shaft portion 3 having the same diameter is integrally connected.

As shown in FIG. 7 (A), the deformed conical portion 1 is a perfect circular portion 4 formed with a part having the same radius of curvature a, and the remaining part is cut along the conical peripheral surface to form a regular part. It is roughly divided into a flank portion 5 (shown by cross hatching in FIGS. 5 and 7B) formed with a radius of curvature b smaller than that of the circular portion 4.

An escape hole 6 is opened at a position where the escape surface portion 5 and the perfect circle portion 4 extend almost half each. The escape hole 6 is provided so as to extend obliquely from the conical portion 1 to the tapered portion 2.

The flank portion 5 has a very small dimensional difference (about 0.4 mm) in the radius of curvature, which is almost the same as the round portion 4 in appearance, and is almost the same as the flank portion 5. The intersecting portion formed by the edge of the beak hole 6 becomes the cutting edge portion 7. Such a conical cutting tool K is attached to the main body of the processing machine, and as shown in FIG. 4, burrs generated around the periphery of the hole 8 provided in the workpiece S are cut and removed.

That is, the tip of the conical portion 1 is inserted into the hole 8 formed in the workpiece S by cutting such as drilling. Since the maximum diameter of the conical portion 1 is naturally larger than the diameter of the hole portion 8, the middle of the conical portion 1 contacts the peripheral edge of the hole portion 8.

Specifically, a total of three places including the perfect circle portion 4, the peripheral edge of the cutting edge portion 7 and the peripheral edge of the non-cutting edge portion of the escape hole 6 come into contact with the peripheral edge of the hole portion 8, and further this tool K is rotationally driven. Thus, the cutting edge portion 7 cuts and removes the burr generated on the peripheral surface of the hole portion 8. The cut burr is discharged from the clearance hole 6 of the tool K.

[0009]

[Problems to be solved by the device]

 In this way, the burrs are extremely rapidly removed by cutting, but the cutting edge portion 7 is inevitably abraded over a long period of use and the sharpness thereof is reduced. At this time, it is necessary to remove the conical cutting tool K from the main body of the processing machine, transfer it to a polishing device, and change it to polish the cutting edge portion 7. Specifically, while rotating the cutting tool K, the conical portion 1 is pressed against a polishing tool such as a grinder to perform polishing.

However, as described above, since the conical portion 1 has a deformed conical shape composed of the perfect circular portion 4 and the flank surface portion 5 having a smaller radius of curvature than this, it is possible to simply rotate the tool, There is a drawback that only the round portion 5 is polished, and polishing on the side of the flank portion 5 where the essential cutting edge portion 7 is formed is insufficient.

Therefore, conventionally, a worn tool is attached to a multi-axis NC (numerical control) polishing machine, the tool is rotated, and the tool is displaced axially at a timing to polish the cutting edge portion 7. In this case, it goes without saying that perfect polishing is possible, but providing the above-mentioned device for polishing leads to an increase in cost and is one of the disadvantageous conditions.

The present invention has been made in view of the above circumstances, and an object of the present invention is to use an ordinary external shape grinding machine to complete a cutting edge portion of a conical cutting tool with a simple structure. Another object of the present invention is to provide a polishing apparatus capable of performing efficient polishing.

[0013]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides

A part of the peripheral surface has a flank surface part with a small radius of curvature, and a deformation cone part having a deformation cone shape is formed at the tip, and a clearance hole is provided along the peripheral edge of this deformation cone part. By using the intersection of the peripheral edge of the clearance hole and the clearance surface of the deformed cone as the cutting edge, by inserting the tip of the cone into the hole provided in the workpiece and rotating it, In a conical cutting tool for cutting and removing burrs generated on the peripheral surface of a hole by the cutting edge part, the conical cutting tool is grasped by a chuck rotating body with the deformed conical part protruding, and a handle is provided. The chuck rotating body is rotatably supported on the support body by being rotated by an operation, and the support body is provided with a guide pin protruding to the circumferential surface of the chuck rotating body.

A guide groove is provided along the circumferential surface of the chuck rotating body, and the protruding end of the guide pin is engaged with the conical cutting tool gripped as the rotating body rotates. The polishing apparatus for a conical cutting tool is characterized in that the abrasive body is slidably contacted with the conical portion of the conical cutting tool, and the cutting edge portion of the conical portion that is displaced forward and backward is polished. .

[0016]

[Operation] When the chuck rotating body is rotated, the guide groove engages with the guide pin and is displaced. As a result, the conical cutting tool moves forward and backward together with the rotating body, and the deformed circular cone moves forward and backward so that the cutting edge portion is polished while rotating with respect to the polishing body.

[0017]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. A polishing apparatus is configured as shown in FIGS. A base 11 is movably mounted on a guide table 10 that is provided straight along a predetermined direction. A support assembly 12 is mounted on the base 11.

The supporting assembly 12 comprises a support body 13 and a chuck rotating body 14 pivotally supported by the support body 13. The chuck rotating body 14 further comprises a rotating body 15 and a tip of the rotating body 15. And a chuck 16 provided in the section.

The chuck 16 detachably holds the conical cutting tool K. A chuck 16 is integrally connected to one end of the rotating body 15, and most of the rotating body 15 is rotatably fitted and supported in a supporting hole 13 a of the supporting body 13.

A handle 17 is provided on the other end surface of the rotary body 15 protruding from the support body 13, and by operating the handle 17, the rotary body 15, the chuck 16 and a cone gripped by the chuck 16 are provided. The shape cutting tool K and the shape cutting tool K can all be rotated together.

On the other hand, a groove cam portion 18 which is a guide groove is provided along the peripheral surface of the rotating body 15, and the guide pin 19 provided on the support body 13 is engaged with the groove cam portion 18. .

As shown schematically in FIG. 3, the developed shape of the groove cam portion 18 is, as shown schematically in FIG. 3, a straight portion 18 a having a straight shape parallel to the end face of the rotating body 15 and a portion of the rotating body 15. The bent portion 18b is formed in an R shape in a direction away from the end surface.

The guide pin 19 has a diameter such that its tip portion projects into the supporting hole 13 a of the support 13 and engages with the groove cam portion 18. Therefore, when the rotating operation is performed on the handle 17, the rotating body 15 rotates together with the chuck 16 and the tool K, and the groove cam portion 18 engages while gradually changing the position with respect to the guide pin 19.

Furthermore, the chuck 16 is marked with, for example, a reference arrow 20 to clarify the gripping reference position for the conical cutting tool K. On the other hand, the tool K, for example, the shaft portion 3, may be provided with the alignment mark 21 for clarifying the alignment position.

The shape of the groove cam portion 18 with respect to the reference arrow 20 is provided here so as to face the curved portion 18b, and the shape of the deformed conical portion 1 with respect to the alignment mark 21 of the tool K is as follows. It is provided so as to face the cutting edge portion 7. Therefore, by gripping the tool K at a predetermined position with respect to the chuck 16, the shape of the groove cam portion 18 and the cutting edge portion 7 correspond to each other.

A polishing body 22 such as a grinder is arranged at a position in sliding contact with the deformed conical portion 1 and is rotationally driven. In other words, the support assembly 12 that holds the tool K and the base 11 can be rotationally adjusted, and the support assembly 12 is angle-adjusted according to the cone angle of the conical portion 1. The conical cutting tool K 1 having a worn edge portion 7 is attached to the polishing apparatus configured in this way, and polishing is performed. That is, as explained above, the reference mark 20 of the chuck 16 must be aligned so that the alignment mark 21 of the tool K corresponds. The support assembly 12 whose angle has been adjusted is moved on the guide table 10, and the deformed cone portion 1 of the tool K is stopped at a position very close to the polishing surface of the polishing body 22. Then, the handle 17 is held, and while being rotated, the deformed cone portion 1 is gradually moved so as to come into contact with the polishing surface.

The conical cutting tool K gripped by the rotating body 15 and the chuck 16 rotates together, and the projecting end of the guide pin 19 provided on the support 13 moves along the circumferential surface of the rotating body 15. Since it is engaged with the grooved cam portion 18 provided, the rotating body 15, the chuck 16, and the conical cutting tool K are moved forward and backward.

Since the groove cam portion 18 has a shape corresponding to the cutting edge portion 7, the conical portion 1 of the conical cutting tool K 1 slides in contact with the polishing body 22 while advancing and retracting. That is, the conical portion 1 advances at a position corresponding to the non-cutting edge portion and retracts at a position corresponding to the cutting edge portion.

Since the conical portion 1 is always in sliding contact with the polishing body 22 with the same sliding contact pressure and the polishing body 22 is driven to rotate, the polishing of the cutting edge portion 7 is particularly smooth and reliable. Will be done. As described above, by appropriately selecting the shape of the groove cam portion 18, it is possible to adjust the amount of advance / retreat displacement and the position with respect to different conical cutting tools.

[0030]

[Effect of device]

 As described above, according to the present invention, the deformed conical portion of the conical cutting tool is gripped by the chuck rotating body and is rotated by the handle operation, and the guide pin is attached to the support body that pivotally supports the chuck rotating body. A guide groove that engages with the guide pin is provided along the circumferential surface of the chuck rotating body, and the conical cutting tool gripped as the rotating body rotates is moved forward and backward so as to correspond to the cutting edge of the cone. , Because I tried to polish the blade edge with a polishing body,

The tool is a simple structure that can rotate the tool and move it back and forth so as to conform to the deformed conical shape of the conical cutting tool, so that the cutting edge of the tool can be completely and efficiently polished. However, the polishing work can be performed with high precision, and the workability can be improved.

[Brief description of drawings]

FIG. 1 is a plan view of a polishing apparatus for polishing a conical grinding tool according to an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view of a polishing apparatus of the same embodiment.

FIG. 3 is a diagram schematically showing the shape of a guide groove in the embodiment.

FIG. 4 is a diagram illustrating a cutting state of the conical grinding tool according to the embodiment.

FIG. 5 is a partial plan view of the conical grinding tool of the embodiment.

FIG. 6 is a partial side view of the conical grinding tool of the embodiment.

7A is a vertical cross-sectional view taken along the line AA of FIG.
(B) is a front view seen from the tip of the conical grinding tool.

[Explanation of symbols]

5 ... Relief surface portion, 1 ... Deformed conical portion, 6 ... Relief hole, 7 ... Blade edge portion, S ... Work piece, 8 ... Hole portion, K ... Conical cutting tool, 1
7 ... Handle, 14 ... Chuck rotator, 13 ... Support,
19 ... Guide pin, 18 ... Guide groove (groove cam portion), 22
… Abrasive body.

Claims (1)

[Scope of utility model registration request] 1. A deformation cone portion having a flank portion having a small radius of curvature on a part of the peripheral surface, and a deformation cone portion having a deformation cone shape is formed at the tip, and a relief hole is provided in the deformation cone portion along a peripheral edge. ,
By using the intersection of the peripheral part of the clearance hole and the clearance surface of the deformed cone as the cutting edge, by inserting the tip of the cone into the hole provided in the workpiece and rotating it, A conical cutting tool for cutting and removing burrs generated on the peripheral surface of a hole at a cutting edge, a chuck that grips the conical cutting tool with the modified conical portion protruding and is rotated by a handle operation. A rotary body, a support body that rotatably supports the chuck rotary body, a guide pin that is provided on the support body and protrudes on the peripheral surface of the chuck rotary body, and is provided along the peripheral surface of the chuck rotary body. A guide groove that engages the protruding end of the guide pin and that causes the conical cutting tool that is gripped by the rotation of the rotating body to move forward and backward so as to correspond to the cutting edge of the cone; Sliding contact with the conical portion of the form cutting tool, and while rotating the polishing apparatus conical cutting tool, characterized by comprising a polishing member for polishing the cutting edge of the conical portion for reciprocating displacement.