JP2007083349A - Cutting-edge replaceable tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting-edge replaceable tool excellent in durability while improving positional accuracy of a cutting blade tip to a holder by improving machinability of the holder. <P>SOLUTION: A pair of opposite clamping pieces 3, 3 sandwiching the cutting blade tip 1 is formed to the front end of the holder 2. A crest part 5 having a ridgeline 4 obliquely traversing between the clamping pieces 3, 3 is formed to the holder 2. A trough part 6 corresponding to the crest part 5 is formed to the cutting blade tip 1. The cutting-edge replaceable tool is provided with a lock means for pressing the trough part 6 against the crest part 5 of the holder 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a blade-tip replaceable tool such as a blade-tip replaceable drill or a blade-tip replaceable tool.

  As a blade-exchangeable tool having a replaceable cutting edge tip, for example, a pair of opposed holding pieces sandwiching the cutting edge tip is formed at the tip of the holder, and between the holding pieces, from the outer periphery of the holder toward the axis 2. Description of the Related Art There is known a blade-replaceable drill in which a concave portion that is gradually deepened is formed in a holder, and the convex portion at the rear end of the cutting edge tip is brought into contact with the concave portion to position the cutting edge tip with respect to the holder (Patent Document 1). .

  However, since the concave portion of the holder of this blade-tip-exchange drill is inward, it is difficult to polish and finish. If the concave portion of the holder is not finished, the positional accuracy of the cutting edge tip relative to the holder cannot be secured, and the load received by the cutting edge tip increases. For this reason, this blade-tip replaceable drill has a problem in durability.

JP 2001-315012 A

  The problem to be solved by the present invention is to improve the position accuracy of the cutting edge tip with respect to the holder by improving the workability of the holder, and to provide a blade-tip replaceable tool having excellent durability.

  In order to solve the above problems, a pair of opposing sandwiching pieces sandwiching the cutting edge tip is formed at the tip of the holder, and a peak portion having a ridge line that obliquely crosses between the sandwiching pieces is formed in the holder. A trough corresponding to the part is formed in the cutting edge chip, and a locking means is provided for pressing the trough against the peak of the holder.

  In this blade-tip replaceable tool, the angle formed by the bottom of the trough with respect to the sandwiched surface sandwiched by the sandwiching piece is greater than the angle formed by the ridge line of the peak portion with respect to the opposing surface of the sandwiching piece. preferable.

  It is preferable that the opposing surfaces of the sandwiching pieces are formed in parallel with each other, or formed so as to be inclined in a direction in which the tip side becomes narrow. Moreover, it is preferable to form the said peak part so that the angle which slopes make may be 45 degrees-120 degrees.

  The locking means includes, for example, a lock screw provided on the clamping piece and a screw abutting surface formed on the cutting edge tip, and by tightening the lock screw abutted on the screw abutting surface. It can comprise so that the said trough part may be pressed down on the said peak part.

  Moreover, in this invention, it has a pair of clamping surface of the reverse direction pinched | interposed into a holder, and the cutting edge which formed the V-groove-shaped trough part which crosses diagonally between the clamping surfaces in the abutting position with a holder A chip is also provided.

  Since the ridge line of the crest is directed obliquely with respect to the clamping piece, the cutting edge replaceable tool of the present invention presses the trough of the cutting edge chip sandwiched between the clamping pieces against the crest of the holder. The position of the cutting edge tip relative to the holder can be fixed. Further, since the ridge line of the mountain portion crosses between the sandwiching pieces, the slope of the mountain portion and the opposing surface of the sandwiching piece form a linear groove with both ends released. Therefore, the slope of the ridge and the opposing surface of the clamping piece are polished and finished to ensure the positional accuracy of the cutting edge tip with respect to the holder, and the durability can be enhanced.

  Further, the angle formed by the bottom of the valley portion with respect to the sandwiched surface is larger than the angle formed by the ridge line of the peak portion with respect to the opposing surface, When the cutting edge tip is fixed by pressing against the portion, the cutting edge tip is pressed against the opposing surface of the clamping piece. Therefore, the cutting edge tip is stably fixed, and the cutting edge tip is not displaced due to cutting resistance.

  In addition, when the opposing surfaces of the sandwiching pieces are formed in parallel with each other, the processing of the sandwiching pieces is easy. On the other hand, the one formed by inclining the facing surface of the sandwiching piece in the direction in which the tip side becomes narrow can surely prevent the cutting edge tip from falling off the holder.

  Moreover, what made the angle between the slopes of the said mountain part 45 degrees-120 degrees has the high intensity | strength of a mountain part, since the angle between the slopes is 45 degrees or more. In addition, since the angle between the inclined surfaces is 120 ° or less, the valley portion of the cutting edge tip is likely to follow the peak portion of the holder, and the positioning of the cutting edge tip is reliable.

  FIG. 1 shows a simplified model of the cutting edge replaceable tool of the present invention. This model includes a cutting edge tip 1 and a holder 2 for fixing the cutting edge tip 1.

  A pair of opposing sandwiching pieces 3 and 3 sandwiching the cutting edge chip 1 are formed at the tip of the holder 2, and a ridge line 4 that obliquely crosses between the sandwiching pieces 3 and 3 is formed between the sandwiching pieces 3 and 3. A mountain portion 5 is formed.

  On the other hand, a trough 6 corresponding to the peak 5 is formed in the cutting edge chip 1 at a position where it faces the peak 5 of the holder 2. The trough portion 6 has a V-groove shape that obliquely crosses between the opposite sandwiched surfaces 7 and 7 sandwiched between the sandwiching pieces 3, and the bottom 8 of the trough portion 6 is formed on the sandwiched surface 7 in FIG. 2. The angle θ <b> 1 formed with respect to the peak portion 5 is larger than the angle θ <b> 2 formed by the ridge line 4 of the peak portion 5 with respect to the facing surface 3 a of the holding piece 3.

  In this model, as shown in FIG. 2, the ridgeline 4 of the peak portion 5 is inclined with respect to the opposing surface 3a of the sandwiching piece 3, so that the cutting edge tip 1 sandwiched between the sandwiching pieces 3 and 3 When the valley portion 6 is pressed against the peak portion 5 of the holder 2, the cutting edge tip 1 is restrained by the opposing surface 3 a of the sandwiching piece 3 and the inclined surface 5 a of the peak portion 5, and the position of the cutting edge tip 1 with respect to the holder 2 is fixed. Is done.

  Moreover, since the ridgeline 4 of the peak part 5 crosses between the clamping pieces 3, the slope 5a of the peak part 5 and the opposing surface 3a of the clamping piece 3 form a linear groove with both ends released. Therefore, the slope 5a of the peak portion 5 and the facing surface 3a of the sandwiching piece 3 are polished and finished with a polishing grindstone arranged along the groove to ensure the positional accuracy of the cutting edge tip 1 with respect to the holder 2 and enhance durability. be able to. Further, since the trough portion 6 of the cutting edge tip 1 also forms a linear groove with both ends open, the slope 6a of the trough portion 6 is polished and finished to further improve the positional accuracy of the cutting edge tip 1 relative to the holder 2. be able to.

  Furthermore, since the angle θ1 is larger than the angle θ2, when the trough 6 of the cutting edge tip 1 is pressed against the crest 5 of the holder 2, the ridge line 4 of the crest 5 and the bottom 8 of the trough 6 are aligned. Is generated, and the cutting edge tip 1 is fixed in a state of being pressed against the opposing surface 3a of the sandwiching piece 3 as shown by the arrow in FIG. Therefore, the fixing of the cutting edge tip 1 is stable, and the positional deviation of the cutting edge tip 1 due to cutting resistance does not occur. Moreover, since the clamping piece 3 receives the cutting edge chip 1 by the surface, the load received by the cutting edge chip 1 and the holder 2 by cutting resistance can be suppressed, and the durability is high.

  FIG. 4 shows an embodiment in which this model is applied to a blade-replaceable drill. This blade-tip-exchangeable drill includes a cutting edge tip 9 and a holder 10 that fixes the cutting edge tip 9.

  As shown in FIGS. 5 and 6, a pair of opposing sandwiching pieces 11, 11 are formed at the tip of the holder 10, and the cutting edge tip 9 is sandwiched between the sandwiching pieces 11, 11. As shown in FIG. 6, a mountain portion 13 having a ridge line 12 that obliquely crosses between the sandwiching pieces 11 and 11 is formed between the sandwiching pieces 11 and 11. Further, a screw hole 14 penetrating from the outer peripheral side to the facing surface 11 a is formed in the clamping piece 11, and a lock screw 15 is screwed into the screw hole 14. As shown in FIG. 5, a round groove 16 for preventing stress concentration is formed at the boundary between the sandwiching piece 11 and the peak portion 13.

  On the other hand, as shown in FIGS. 7 and 8, the cutting edge tip 9 is formed with a valley portion 17 corresponding to the peak portion 13 at a position where it abuts with the peak portion 13 of the holder 10. The trough portion 17 has a V-groove shape that obliquely crosses between the sandwiched surfaces 18, 18 in opposite directions sandwiched by the sandwiching piece 11, and the bottom 19 of the trough portion 17 in FIG. 6 is larger than the angle θ4 formed by the ridgeline 12 of the peak 13 with respect to the opposing surface 11a of the sandwiching piece 11 in FIG.

  As shown in FIG. 9, the cutting edge tip 9 is formed with a conical screw contact surface 20 at a position corresponding to the screw hole 14 of the holder 10. When the lock screw 15 is screwed into the screw hole 14 and brought into contact with the crest portion 13 side of the screw contact surface 20 as shown in FIG. 10 and the lock screw 15 is further tightened, the screw contact surface 20 is generated. The trough 17 of the cutting edge tip 9 can be pressed against the crest 13 of the holder 10 by the component force.

  Since the ridge line 12 of the peak portion 13 is inclined obliquely with respect to the sandwiching piece 11 in the same manner as in the above-described model, this blade-tip-replaceable drill is tightened with the lock screw 15 so that the trough portion 17 of the cutting edge tip 9 is removed. The position of the cutting edge tip 9 with respect to the holder 10 can be fixed by pressing against the peak 13 of the holder 10.

  Moreover, since the ridgeline 12 of the mountain portion 13 crosses between the sandwiching pieces 11 as in the above-described model, the slope 13a of the mountain portion 13 and the opposing surface 11a of the sandwiching piece 11 are polished and finished to improve durability. Can be increased. Further, the trough portion 17 of the cutting edge tip 9 can also be polished and finished to further improve the positional accuracy of the cutting edge tip 9.

  Further, since the angle θ3 is larger than the angle θ4, when the trough portion 17 of the cutting edge tip 9 is pressed against the peak portion 13 of the holder 10 to fix the cutting edge tip 9, the cutting edge tip is shown as shown by the arrow in FIG. 9 is pressed against the opposing surface 11 a of the sandwiching piece 11. Therefore, the positional deviation of the cutting edge tip 9 due to cutting resistance does not occur. Moreover, since the clamping piece 11 receives the cutting edge chip 9 by the surface, durability is high.

  The opposing surfaces 11a of the sandwiching pieces 11 are preferably formed parallel to each other as shown in FIG. 5, but the processing of the sandwiching pieces 11 is facilitated. If it does in this way, the opposing surface 11a becomes prevention of removal of the cutting-blade tip 9, and it can prevent reliably that the cutting-edge tip 9 falls off from the holder 10. FIG.

  Moreover, it is preferable that the angle α formed by the slopes 13a of the mountain portion 13 shown in FIG. 12 is 45 ° to 120 °. When the angle α is 45 ° or more, the strength of the peak portion 13 can be ensured. Moreover, when the angle α is 120 ° or less, the valley portion 17 of the cutting edge tip 9 is likely to follow the peak portion 13, and the cutting edge tip 9 can be positioned reliably.

  In the above-described embodiment, the trough 17 is pressed against the peak 13 by the component force generated on the screw contact surface 20, but the trough 17 may be pressed against the peak 13 by other methods. For example, as shown in FIG. 13, a screw hole 21 is formed at the rear end of the cutting edge tip 9, a pull bolt 22 provided on the holder 10 is screwed into the screw hole 21 of the cutting edge chip 9, and the pull bolt 22 is tightened to cut. The valley portion 17 of the blade tip 9 may be pressed against the peak portion 13 of the holder 10.

  14 and 15 show an embodiment in which the present invention is applied to a blade end replaceable ball end mill. This end mill is composed of a cutting edge tip 23 and a holder 24 for fixing the cutting edge tip 23, similar to the above-described blade-tip-replaceable drill, and a pair of opposed clamping pieces sandwiching the cutting edge tip 23 at the tip of the holder 24. As shown in FIG. 16, a mountain portion 27 having a ridge line 26 that obliquely crosses between the sandwiching pieces 25, 25 is formed between the sandwiching pieces 25, 25. Further, as shown in FIG. 17, a screw hole 28 is formed in the clamping piece 25 obliquely rearward, and a lock screw 29 is screwed into the screw hole 28.

  On the other hand, as shown in FIGS. 18 and 19, a trough 30 corresponding to the peak 27 is formed at the rear end of the cutting edge tip 23 at a position where it abuts with the peak 27 of the holder 24. The valley portion 30 has a V-groove shape that obliquely crosses between the opposite sandwiched surfaces 31, 31 sandwiched by the sandwiching piece 25, and the bottom 32 of the valley portion 30 in FIG. The angle θ5 to be formed is larger than the angle θ6 formed by the ridge line 26 of the peak portion 27 with respect to the opposing surface 25a of the sandwiching piece 25 in FIG. Further, as shown in FIG. 18, the cutting edge tip 23 is formed with a screw contact surface 33 perpendicular to the screw hole 28 at a position corresponding to the screw hole 28 of the holder 24.

  In this end mill, the tip of the lock screw 29 is brought into contact with the screw contact surface 33 and tightened, and the trough 30 of the cutting edge tip 23 is moved by the propulsive force of the lock screw 29 in the same manner as the above-described blade-tip replaceable drill. The position of the cutting edge tip 23 with respect to the holder 24 can be fixed by pressing against the peak portion 27 of the holder 24. Further, the slope 27a of the peak portion 27 and the facing surface 25a of the sandwiching piece 25 can be polished and finished to improve durability, and the trough portion 30 of the cutting edge tip 23 is also polished and finished, so that the cutting edge tip 23 The position accuracy can be further improved. Further, since the angle θ5 is larger than the angle θ6, when the trough portion 30 of the cutting edge tip 23 is pressed against the peak portion 27 of the holder 24 and the cutting edge tip 23 is fixed, the cutting edge tip is shown as shown by the arrow in FIG. 23 is pressed against the facing surface 25a of the sandwiching piece 25, and the cutting edge tip 23 is stably fixed.

  20 and 21 show an embodiment in which the present invention is applied to a clamp tool. This tool also includes a cutting edge tip 34 and a holder 35 that fixes the cutting edge tip 34, as in the above-described blade-tip-replaceable drill, and a pair of opposed clamping pieces that sandwich the cutting edge tip 34 at the tip of the holder 35. 36 and 36 are formed, and a peak portion 38 having a ridge line 37 obliquely crossing between the sandwiching pieces 36 and 36 is formed between the sandwiching pieces 36 and 36 as shown in FIG. A screw hole 40 into which the clamp screw 39 is screwed is formed in the mountain portion 38.

  On the other hand, as shown in FIGS. 23 and 24, the cutting edge tip 34 is formed with a valley 41 corresponding to the peak 38 at a position where it abuts with the peak 38 of the holder 35. The trough portion 41 has a V-groove shape that obliquely crosses between the sandwiched surfaces 42 and 42 in opposite directions sandwiched by the sandwiching piece 36, and the bottom 43 of the trough portion 41 with respect to the sandwiched surface 42 in FIG. 22 is larger than the angle θ8 formed by the ridgeline 37 of the peak portion 38 with respect to the opposing surface 36a of the sandwiching piece 36 in FIG. Further, the cutting edge tip 34 is formed with a through hole 44 into which the clamp screw 39 is inserted.

  In the same manner as in the above-described blade tip type drill, this clamp tool also tightens the clamp screw 39 and presses the valley 41 of the cutting edge tip 34 against the peak portion 38 of the holder 35 so that the cutting edge tip 34 can be The position can be fixed. Further, the slope 38a of the peak portion 38 and the facing surface 36a of the sandwiching piece 36 can be polished and finished to enhance durability, and the valley portion 41 of the cutting edge tip 34 is also polished and finished, so that the cutting edge tip 34 The position accuracy can be further improved. Further, since the angle θ7 is larger than the angle θ8, when the trough portion 41 of the cutting edge tip 34 is pressed against the peak portion 38 of the holder 35 and the cutting edge tip 34 is fixed, the cutting edge tip is shown as shown by the arrow in FIG. 34 is pressed against the opposed surface 36a of the sandwiching piece 36, and the cutting edge tip 34 is stably fixed.

The perspective view which shows the model of the blade-tip-exchange-type tool of this invention (A) is a figure which shows the cutting edge chip | tip of the model of FIG. 1, (b) is a figure which shows the holder of the model of FIG. The figure which shows the state which fixed the cutting edge chip | tip of Fig.2 (a) to the holder of FIG.2 (b). Side view showing a cutting edge replaceable drill to which the present invention is applied The figure which shows the holder of the blade-tip-exchange-type drill of FIG. Sectional view of the holder shown in FIG. 4 is a side view of the cutting edge tip of the blade tip replaceable drill in FIG. The figure which looked at the cutting-edge chip | tip shown in FIG. 7 from back 4 is a side view of the cutting edge tip of the blade tip replaceable drill in FIG. The figure explaining the lock screw of the blade tip type drill of FIG. Fig. 4 is a view of the blade tip replaceable drill of Fig. 4 as viewed from the tip side. The figure which looked at the holder shown in Drawing 5 from the direction of the ridgeline of a mountain part The figure explaining the modification which fixes the cutting-blade tip of the blade-tip-exchange-type drill of FIG. 4 with a pull bolt Side view showing a blade end replaceable ball end mill to which the present invention is applied 14 is a view of the blade end replaceable ball end mill of FIG. 14 as viewed from the tip side. Cross-sectional view of the holder of the blade end replaceable ball end mill of FIG. FIG. 14 is a diagram for explaining a lock screw of the blade end replaceable ball end mill of FIG. 14 is a side view of a cutting edge tip of the blade end replaceable ball end mill of FIG. The figure which looked at the cutting-edge chip | tip shown in FIG. 18 from back Side view showing a clamp bit to which the present invention is applied FIG. 20 is a view of the clamp tool of FIG. 20 as viewed from the tip side. 20 is a sectional view of the holder of the clamp tool in FIG. Side view of the cutting edge tip of the clamp tool of FIG. The figure which looked at the cutting-edge chip | tip shown in FIG. 23 from back

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting edge tip 2 Holder 3 Clamping piece 3a Opposite surface 4 Ridge line 5 Mountain part 5a Slope 6 Valley part 7 Clamping surface 8 Bottom of valley part 9 Cutting edge chip 10 Holder 11 Clamping piece 11a Opposing surface 12 Ridge line 13 Crest part 13a Slope 15 Lock Screw 17 Valley 18 Grasped Surface 19 Valley Bottom 20 Screw Contact Surface 23 Cutting Edge Tip 24 Holder 25 Grasp 25a Opposing Surface 26 Ridge 27 Mountain 27a Slope 29 Lock Screw 30 Valley 31 Grasp 31 Valley portion bottom 33 Screw contact surface 34 Cutting edge tip 35 Holder 36 Holding piece 36a Opposing surface 37 Edge line 38 Mountain portion 38a Slope 41 Valley portion 42 Clamping surface 43 Valley bottoms θ1, θ3, θ5, θ7 Valley portion Angles θ2, θ4, θ6, θ8 formed by the bottom with respect to the sandwiched surface Angle formed by the ridgeline of the peak portion with respect to the opposing surface of the sandwiching piece α Angle formed between the slopes of the peak portion

Claims (7)

  A pair of opposing sandwiching pieces 3, 3 sandwiching the cutting edge tip 1 is formed at the tip of the holder 2, and a peak portion 5 having a ridge line 4 obliquely crossing between the sandwiching pieces 3, 3 is formed in the holder 2. A cutting edge-exchangeable cutting tool provided with a locking means for forming a trough 6 corresponding to the crest 5 on the cutting edge tip 1 and pressing the trough 6 against the crest 5 of the holder 1.   The angle formed by the bottom 8 of the valley portion 6 with respect to the sandwiched surface 7 sandwiched by the sandwiching piece 3 is larger than the angle formed by the ridge line 4 of the peak portion 5 with respect to the opposing surface 3a of the sandwiching piece 3. The cutting edge exchangeable cutting tool according to claim 1.   The blade edge-exchangeable cutting tool according to claim 1 or 2, wherein the opposing surfaces 3a of the clamping pieces 3 are formed in parallel to each other.   The cutting edge replacement type cutting tool according to claim 1 or 2, wherein the opposing surface 3a of the sandwiching piece 3 is formed to be inclined in a direction in which the tip end side becomes narrower.   The blade tip-exchangeable cutting tool according to any one of claims 1 to 4, wherein an angle formed between the slopes 5a and 5a of the mountain portion 5 is 45 ° to 120 °.   The lock means comprises a lock screw 15 provided on the clamping piece 11 and a screw contact surface 20 formed on the cutting edge tip 9, and the lock screw 15 brought into contact with the screw contact surface 20 is The cutting edge replacement type cutting tool according to any one of claims 1 to 5, wherein the trough portion 17 is pressed against the crest portion 13 by tightening.   A cutting edge tip having a pair of oppositely sandwiched surfaces sandwiched between holders, and having a V-groove trough that obliquely crosses between the sandwiched surfaces at the abutting position with the holder.

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