JPH04112706U - Throwaway tool for grooving - Google Patents

Abstract

(57) [Summary] [Purpose] In indexable grooving tools that use inserts with cutting edges on both ends, the insert can be inserted with high accuracy even when the insert is installed with the chipped cutting edge facing toward the rear of the holder. Position. [Configuration] A holder, a supporter having a chip mounting seat extending in the longitudinal direction of the holder, and a supporter placed on the chip mounting seat,
The both ends thereof are equipped with a tip having cutting edges symmetrical to each other with respect to the center line of the tip, and a clamp means for pressing the top surface of the tip to fix the tip to the tip mounting seat. A positioning recess having a shape symmetrical with respect to the chip center line is formed at a position corresponding to the chip center line, and a positioning projection that is removably fitted into the recess is formed on the lower surface of the chip.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses an insert with cutting edges at both ends, and cuts the workpiece with either cutting edge. In particular, the used cutting edge is damaged when using indexable tools for grooving. This invention relates to improvements for increasing the accuracy of chip positioning even when

0002

[Conventional technology]

Figures 4 and 5 are examples of indexable grooving tools targeted by the present invention. FIG. 2 is a side view and a front view showing the same.

0003 To explain the outline of the configuration, reference numeral 1 in the figure is a square bar-shaped holder, and 2 is the tip of the holder 1. 12 is a chip placed on the supporter 2, 6 is a chip This is a clamp piece that presses and fixes 12 against the supporter 2.

0004 The supporter 2 includes a flat plate portion 2A extending in front of the holder 1 and a thick portion 2B. The convex portion 2C formed on the side surface of the thick portion 2B is aligned with the concave portion formed on the side surface of the holder 1. It is fitted into the section 1A and is fixed to the holder 1 with two setscrews 4. flat The upper surface of the plate portion 2A is used as a chip mounting seat 14, and a chip mounting seat 14 is provided along the entire length. A groove 14A having a V-shaped cross section is formed.

[0005] The clamp piece 6 consists of a flat pressing part 6A and a thick part 6B, which penetrates vertically. It is fixed to the upper surface of the holder 1 with a clamp screw 10. Rear end of pressing part 6A A protrusion 6C is formed on the lower surface, and this protrusion 6C contacts the recess 18 on the upper surface of the holder 1. The tip of the pressing part 6A elastically presses the central upper surface of the chip 12. ing. Further, a protrusion 8 is formed on the lower surface of the thick portion 6B, and this protrusion 8 is attached to the holder 1. It is applied to the groove 1B on the top surface of.

[0006] The tip 12 has a cutting edge 12B integrally fixed to both ends of a square bar-shaped main body 12A. , a protrusion 16 having a V-shaped cross section is formed on its lower surface. This protrusion 16 The tip is inserted into the groove 14A of the tip mounting seat 14, and in this state, the cutting edge on the rear end side of the tip 12 12B is in surface or line contact with the chip support surface 20 formed at the tip of the holder 1, and the chip The tip 12 is positioned in the longitudinal direction.

[0007] In such indexable tools for grooving, there are blades at both ends of the tip 12. Since the tip 12B is provided, if the sharpness of the cutting edge 12B deteriorates during use, By loosening the clamp screw 10, reversing the front and back of the chip 12, and attaching it again. , it has the advantage that cutting can be performed again.

[0008]

[Problem that the idea aims to solve]

However, in the indexable type tool for grooving mentioned above, the cutting edge of the unused side 12B is brought into contact with the chip support surface 20 of the holder 1, and the position of the chip 12 in the longitudinal direction is Since it is used for cutting, the previously used cutting edge 12B may be chipped, as shown in Figure 6. In this case, if this chip 12 is installed in the chip mounting seat 14 in the opposite direction, the result shown in FIG. As shown, the position of the tip 12 shifts backward by the amount of chipping of the cutting edge 12B, and the groove machining depth decreases. goes crazy. Moreover, even if this is corrected, the contact between the defective part K and the chip support surface 20 The condition is not stable, and there is a risk that the tip 12 will shake and the cutting will become unstable. Was.

[0009]

[Means to solve the problem]

This invention was devised to solve the above problems, and includes a holder and a It is provided at the tip and has a tip mounting seat extending in the longitudinal direction of the holder on its top surface. It is placed on the supporter and the chip mounting seat, and the ends of the supporter and the chip are placed on the The tip has a very symmetrical cutting edge, and the tip is mounted on the holder and presses the top surface of the tip. Throw-away for grooving equipped with clamp means for fixing the tip to the insert mounting seat. In the type tool, the tip mounting seat has a tip at a position corresponding to the center of the tip. A positioning recess is formed symmetrically with respect to the center line of the chip, while the bottom surface of the chip is , is characterized by forming a positioning convex part that removably fits into this concave part. Ru.

0010

[Effect]

In the indexable type tool for grooving of this invention, the position formed on the insert mounting seat is The chip can be lengthened by fitting the positioning protrusion on the bottom surface of the chip into the positioning recess. To position the tip in the hand direction, attach the tip with the chipped edge facing toward the rear of the holder. The chip can be fixed with high precision even when

[0011]

【Example】

FIG. 1 is a side view showing an embodiment of the indexable tool for grooving according to the present invention. The same parts as those in FIGS. 4 and 5 described above are given the same reference numerals and explanations will be given. Omitted.

0012 The feature of this embodiment is that the chip mounting seat 14 of the supporter 2 has a longitudinal direction of the chip 30. A positioning recess 34 is formed at a position corresponding to the central part of the chip 30, while the main part of the chip 30 is A positioning protrusion 32 that fits into the positioning recess 34 is formed on the lower surface of the body 30A. It's in what we accomplished.

[0013] The positioning recess 34 has a trapezoidal shape that is symmetrical in the front and rear directions with respect to the chip center line O. Ru. Both side surfaces of the positioning recess 34 are sloped surfaces whose opening width increases toward the opening end. The wedge angle α is preferably 5 to 15 degrees. Within this range, positioning The clamping force of the positioning convex portion 32 by the positioning concave portion 34 is appropriate. However, books In the invention, the clamping force by the recess 34 is not necessarily essential, and even outside the above range may be sufficient. You can get a tool that can be used for several minutes.

[0014] The chip mounting seat 14 has a portion extending in the longitudinal direction excluding the positioning recess 34. A groove 38 having a V-shaped cross section is formed, and a groove 38 is formed on the lower surface of the chip 30 excluding the convex portion 32. A protrusion 36 that fits into the groove 38 is formed. Then, groove 3 of the chip mounting seat When the protrusion 36 is fitted into the positioning groove 8 without any gap, the positioning recess 34 and the positioning convex The portions 32 are elastically fitted to firmly fix the chip 30.

[0015] Note that in this example, the positioning recess 34 and the positioning protrusion 32 are fitted to each other. Since the tip 30 is positioned, the cutting edge 30B on the rear end side of the tip 12 and the holder 1 The tip surfaces 20 of are spaced apart.

[0016] According to the indexable tool for grooving having the above configuration, the tip mounting seat 14 The positioning convex portion 32 on the lower surface of the chip 30 is inserted into the positioning concave portion 34 formed in the Since they fit together and position the tip 30 in the longitudinal direction, the chipped cutting edge 30B can be removed. Even when the tip 30 is installed toward the rear of the holder, it will not work regardless of whether there is a defect or not. It is possible to fix the tip 30 with high precision, and there is no possibility of deviations in the depth of cut. There is no wobbling of the chip 30.

[0017] In addition, in this embodiment, the positioning recess 34 and the positioning convex part 32 have wedge angles. Since α is attached, the concave portion 34 and the convex portion 32 are elastic when the chip 30 is attached. They fit together sexually, and the above effect can be further enhanced.

[0018] Next, FIG. 2 shows a second embodiment of the present invention, in which a groove 3 is provided in the chip mounting seat 14. 8, grooves 42 are formed on both side walls of the positioning recess 34. In addition, protrusions 40 are formed on both sides of the positioning projection 32. Even in this example , the same effects as in the above embodiment can be obtained.

[0019] Further, FIG. 3 shows a third embodiment of the present invention, and in this example, the position of the chip mounting seat 14 is It is noted that a vertical slit 44 is formed in the holder tip side of the positioning recess 34. Features. A circular hole 46 is formed at the back of the slit 44 to alleviate stress. It is being According to this example, the side surface 34A of the positioning recess 34 on the holder tip side is more likely to be elastically displaced toward the tip of the holder, so the clamp is more easily displaced than in the first embodiment. The pumping effect can be enhanced.

[0020] Note that the present invention is not limited to the above embodiments, and can be modified as necessary. Of course, you can change the configuration. For example, positioning recesses and positioning protrusions. The shape of the part is not limited to trapezoidal, but can be three-dimensional as long as it is symmetrical with respect to the chip center line O. It may be square, semicircular, elliptical, or the like. In addition, the supporter and holder have an integrated structure. It may be.

[0021]

[Effect of the idea]

As explained above, according to the indexable tool for grooving according to the present invention, , a positioning convex portion on the bottom surface of the chip is inserted into a positioning recess formed on the chip mounting seat. Since the insert is positioned in the longitudinal direction by fitting the Even when inserting the tip with the tip facing toward the rear of the holder, the tip can be fixed with high precision. It is possible to Therefore, the depth of cut may be incorrect and the insert may become loose. Therefore, high cutting accuracy can always be obtained.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of an indexable grooving tool according to the present invention.

FIG. 2 is a side view showing another embodiment of the present invention.

FIG. 3 is a side view showing still another embodiment of the present invention.

FIG. 4 is a side view showing a conventional indexable tool for grooving.

FIG. 5 is a front view of the indexable tool.

FIG. 6 is a side view showing a problem with the indexable tool.

FIG. 7 is a side view showing a problem with the indexable tool.

[Explanation of symbols]

1 holder 2 Supporter 2A Flat plate part of supporter 6 Clamp piece 14 Chip mounting seat 30 chips 30A chip body 30B cutting edge 32 Positioning protrusion 34 Positioning recess 36 protrusion 38 Groove 40 protrusion 42 Groove

Claims (1)

[Scope of utility model registration request] Claims: 1. A holder, a supporter provided at the tip of the holder and having a chip mounting seat extending in the longitudinal direction of the holder on the upper surface thereof, and a supporter placed on the chip mounting seat,
A grooving throw equipped at both ends thereof with a tip having cutting edges symmetrical to each other with respect to the tip center line, and a clamping means provided on the holder for pressing the top surface of the tip and fixing the tip to the tip mounting seat. In the away-type tool, the tip mounting seat has a positioning recess formed in a shape symmetrical with respect to the tip center line at a position corresponding to the center of the tip, and the lower surface of the tip has a positioning recess formed in a position corresponding to the center of the tip. A throw-away tool for grooving, characterized by forming a positioning convex portion that is removably fitted.