JP4854708B2 - Throwaway tool - Google Patents

Description

  The present invention relates to a throw-away tool using a tip for a throw-away tool.

  Throw-away tools that use triangle, square, and diamond-shaped carbide tips (throw-away tips) in turn are well known as clamping tools that can replace carbide tips in the tool body including the shank. It has been. Examples of the throw-away tool include a milling cutter and an end mill.

  The current throw-away tip is normally used only on one side and is thrown away without being re-polished. To increase the number of uses, the tip shape must be polygonal and the number of corners of one tip is large. Good.

  However, when the number of corners of the chip increases, that is, when the number of polygons increases, the angle between adjacent pieces decreases according to the number of polygons, so that an appropriate clearance angle cannot be obtained and cutting efficiency is sacrificed. Become.

  In addition, restrictions on the throw-away tip, especially in the case of a milling cutter type throw-away tool using a bottom blade, when one side of the throw-away tip is used as the bottom blade, the side located on the rotating outer peripheral surface side of the tool It is required that the part does not have a large angle with respect to the tool rotation axis. If the angle is large, the side portion (corner portion) located on the rotating outer peripheral surface side of the tool protrudes outward, and the corner machinability is reduced in order to avoid interference between this protruding portion and the workpiece. It is because it falls.

  The present invention has been made to solve the above-described problems, and is capable of taking an appropriate clearance angle, and in the case of a milling cutter specification using a bottom blade, on the rotating outer peripheral surface side of the tool. It is an object of the present invention to provide a throw-away tool that uses a long-life throw-away tool tip having the largest number of corners, in addition to the fact that the side portion positioned at is not having a large angle with respect to the tool rotation axis.

According to the first aspect of the present invention, a chip whose side shape is a regular heptagon and whose both side surfaces are parallel to each other and formed in a regular heptagonal column shape is clamped with a cutting blade angle of 45 °, and a bottom blade This is a throw-away tool used as a milling cutter using

  According to the present invention, by attaching a throwaway tool tip having a heptagonal side shape to the tool body, the throwaway tool tip can take an appropriate clearance angle and a milling cutter using a bottom blade. In the case of the cutter specification, the side located on the rotating outer peripheral surface side of the tool does not have a large angle with respect to the tool rotation axis, and there are many corners and a long-life chip with a long durability, Resource saving will be achieved along with the improvement of economy.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 4 show an embodiment of a throw-away tool and a tip having a tip for a throw-away tool (hereinafter abbreviated as a tip) according to the present invention.

  The throw-away tool includes a tool body 2 having a shank portion 1 and a tip 10 clamped by a clamp claw 4 that is detachably fixed to the tool body 2 with a bolt 3. This throw-away tool is configured as a milling cutter, and three tips 10 are provided at the tip of the tool body 2 with a rotation angle of 120 degrees.

The chip 10 is formed of a cemented carbide or the like into a polygon whose side surface shape is a regular heptagon, and has seven side portions 11 _{1 to} 11 ₇ and seven corner portions 12 _{1 to} 12 ₇ . Both side surfaces 13a and 13b are parallel to each other. The angle (inner angle) θ between adjacent sides of the chip 10 is about 128 degrees 58 minutes. As shown in FIG. 4, when the cutting blade angle β is set to 45 degrees, the bottom clearance angle α Can be secured at 6.42 degrees.

Since the tip 10 is a regular heptagon, the outer angle between adjacent sides is approximately 128 degrees and 58 minutes, and the bottom clearance angle α can be set to an appropriate angle. The side portion located on the side (side portion 11 _{6 in} FIG. 3 (a)) does not have a large angle with respect to the tool rotation axis X, and the corner portion (side portion 12 _{7 in} FIG. 3 (a)) protrudes. The tension amount t is stopped at a small value.

  As a result, the tip 10 can take an appropriate clearance angle α, and in the case of a milling cutter specification using a bottom blade, the side portion located on the rotation outer peripheral surface side of the tool is in relation to the tool rotation axis. In addition, the number of corners is 7 and the side surfaces 13a and 13b are parallel to each other, making it a reversible type that can be used upside down. As a result, a long-life chip having a long usable time (endurance time) is obtained.

  Further, since both side surfaces 13a and 13b are parallel to each other, the entire shape of the chip 10 becomes simple, there is no chip manufacturability, and it can be easily re-polished and reused on the user side. become.

1 is an overall view showing an embodiment of a throw-away tool having a tip for a throw-away tool according to the present invention. It is an enlarged front end view of a throw-away tool having a tip for a throw-away tool according to the present invention. (A) is a side view showing one embodiment of a tip for a throwaway tool according to the present invention, and (b) is an end view of the same. It is explanatory drawing which shows that if the cutting angle β is set to 45 degrees, the bottom clearance angle α can be secured to 6.42 degrees.

Explanation of symbols

1 the shank portion 2 tool body 3 volts 4 clamp jaws 10 chips ₁₁ 1 to 11 ₇ side portion ₁₂ 1 to 12 ₇ corner

Claims (1)

A chip whose side shape is a regular heptagon and whose both side surfaces are parallel to each other and formed into a regular heptagonal column is clamped with a cutting blade angle of 45 ° and used as a milling cutter that uses a bottom blade. A throwaway tool characterized by that.

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