JP3235000U - Cutting tool with tip breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool with a tip breaker capable of easily changing the shape of a rake face provided on an insert tip according to a work material and appropriately dividing chips. A cutting tool with a tip breaker has an insert tip 12, a tip breaker 13 attached to the insert tip, a first screw member 15 for fixing the insert tip to a tool holder, and a tip breaker as the insert tip. It is provided with a second screw member 16 that can be attached. The insert tip is formed with a through hole 122 for penetrating the first screw member and a conical support portion for supporting the head of the first screw member. A screw hole for screwing the second screw member is formed in the center of the top surface of the head of the first screw member. The chip breaker has a through hole 131 for penetrating the second screw member and is formed with a support portion for fixing the second screw member. [Selection diagram] FIG. 5

Description

The present invention relates to a cutting tool using an insert tip.

In cutting, it is an important factor for improving productivity at the cutting site to divide chips generated during cutting and improve the efficiency of chip processing. An insert tip is used for cutting, and chips are divided by a rake face provided on the insert tip.

As a method for fixing the insert tip during cutting, a clamp-on type fixing method is known (see Patent Document 1). The clamp-on type uses a claw called a presser piece adjacent to the tip seat. When the tightening screw inserted through the base end of the presser piece is tightened, the tip of the presser piece pulls in the through hole and presses the upper surface of the insert tip, so that the insert tip can be fixed.

Japanese Patent No. 4811753

However, in recent years, it is desired to change the shape of the rake face provided on the insert tip according to the work material to be machined to separate chips.

Further, in cutting, it is difficult to flexibly handle all work materials with one type of insert insert because the machinery and equipment used and the processing conditions are various. Therefore, when cutting, it is necessary to have a plurality of insert tips having different shapes.

Further, in the conventional clamp-on type fixing method, the part of the presser piece is structurally greatly projected above the upper surface of the insert tip, which causes chips to interfere with the part and reduce the productivity in cutting. There was a risk of causing it.

As a means for solving the above-mentioned problems, the first cutting tool according to the present invention includes a first screw member for fixing the insert tip to the tool holder and a second screw member for attaching the tip breaker to the first screw member. The insert tip has a support hole having a support portion for penetrating the first screw member and supporting the head of the first screw member, and the top surface of the head of the first screw member has the above-mentioned. The tip breaker has a support hole having a screw hole for screwing the second screw member, and a support portion for penetrating the second screw member and supporting the head of the second screw member. It is characterized by having. With such a configuration, only the chip breaker can be attached and detached.

Further, as a means for solving the above-mentioned problems, the second cutting tool according to the present invention includes an insert tip, a tip breaker mounted on the insert tip in an overlapping manner, and the insert tip and the tip breaker as a tool holder. The insert tip has a through hole for penetrating the threaded member, and the tip breaker penetrates the threaded member and supports the head of the threaded member. It is characterized by having a support hole having a portion. With such a configuration, the insert insert suitable for various work materials can be used by exchanging the insert breaker.

Further, the insert tip preferably has a detent structure for locking the tip breaker. With such a configuration, the chip breaker can be stably fixed during cutting.

Furthermore, it is preferable that the angle shape of the chip breaker can be changed by additional machining or secondary machining. With such a configuration, an appropriate chip breaker can be used depending on the work material.

Further, the chip breaker is preferably made of cemented carbide or tool steel. With such a configuration, deterioration of the chip breaker can be prevented.

According to the present invention, a suitable insert insert can be used depending on the work material, and the efficiency of cutting chips generated during cutting can be improved.

It is a perspective view which shows the 1st Embodiment. It is a top view which shows the 1st Embodiment. It is XX sectional view which shows the 1st Embodiment. It is an exploded view which shows the 1st Embodiment. It is a perspective view which shows the attachment state of the tool which shows the 1st Embodiment. It is sectional drawing which shows the detent structure. It is a perspective view which shows the other chip breaker of 1st Embodiment. It is a perspective view which shows the other chip breaker of 1st Embodiment. It is a perspective view which shows the other chip breaker of 1st Embodiment. It is a perspective view which shows the other chip breaker of 1st Embodiment. It is a perspective view which shows the 2nd Embodiment. It is a top view which shows the 2nd Embodiment. It is a YY sectional view which shows the 2nd Embodiment. It is an exploded view which shows the 2nd Embodiment.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

1 to 4 show a first embodiment of the cutting tool with a tip breaker of the present invention.
The cutting tool 11 with a tip breaker includes an insert tip 12, a tip breaker 13 attached to the insert tip 12, and a screw member set 14 for fixing the insert tip 12 and the tip breaker 13. The screw member set 14 is composed of two screw members, and includes a first screw member 15 for fixing the insert tip 12 to the tool holder, and a second screw member 16 for attaching the tip breaker 13 to the insert tip 12. It becomes. The insert tip 12 is formed with a through hole 122 for penetrating the first screw member 15 and a conical support portion 121 for supporting the head portion 15a of the first screw member. A screw hole 151 for screwing the second screw member 16 is formed in the center of the top surface of the head of the first screw member 15. The tip breaker 13 has a through hole 131 for penetrating the second screw member 16 and is formed with a support portion 132 for fixing the second screw member 16.

By screwing the second screw member 16 into the first screw member 15, the tip breaker 13 is fixed to the insert tip 12. As a result, only the chip breaker 13 can be attached and detached, and by holding several types of chip breakers 13, a chip breaker 13 suitable for the work material can be used.

The insert tip 12 and the tip breaker 13 are provided with a detent structure in order to prevent the tip breaker 13 from detenting during cutting. As the detent structure, for example, as shown in FIGS. 6A, 6B, and 6C, a hemispherical, conical, or columnar recess 17 is formed on one of the facing surfaces of the insert tip 12 and the tip breaker 13. On the other hand, a hemispherical, conical or columnar convex portion 18 that fits the concave portion 17 is formed. The concave portion 17 and the convex portion 18 have a shape that fits tightly. The concave portion and the convex portion may be formed in reverse. By fitting the detent structure provided on the insert tip 12 with the detent structure provided on the tip breaker 13, the rotation of the tip breaker 13 with respect to the insert tip 12 is prevented. The tip breaker 13 is fixed in a state of being positioned with respect to the insert tip 12 by forming the detent structure, the head portion 15a of the first screw member 15, and the support portion 121 in a tightening structure.

As a method of using the cutting tool 11 with a tip breaker, as shown in FIG. 5, the first screw member 15 is passed through the through hole 122 formed in the insert tip 12, and the screw hole 31 provided in the tool holder A is used. The first screw member 15 is screwed. Next, the tip breaker 13 is installed in the insert tip 12, and the second screw member 16 is screwed into the screw hole 151 formed in the center of the head of the first screw member 15 by inserting the tip breaker 13 into the through hole 131 of the tip breaker 13. Will be done.
As a result, the chips of the work material cut by the insert insert 12 are processed by the rake face 32 of the chip breaker 13, and the chip processing defects caused by the conventional clamp-on type can be eliminated. ..
Further, by removing the second screw member 16 without loosening it, only the tip breaker 13 can be easily replaced.

As shown in FIG. 7, the rake face 32 formed when the tip breaker 13 is attached to the insert tip 12 may be formed to be four faces. Thereby, a suitable tip breaker 13 can be used according to the work material and the cutting conditions.

Also, as shown in FIGS. 9 and 10. When two or more rake faces 33 and 34 are formed, the shapes of the rake faces 33 and 34 may be different. For example, in the case where two rake faces are formed, one rake face 33 is formed with a single or a plurality of grooves, and the other rake face 34 is formed with a single or a plurality of different grooves. May be.

11 to 14 show a second embodiment of the cutting tool with a tip breaker of the present invention.
The cutting tool 21 with a tip breaker has an insert tip 22, a tip breaker 23 attached to the insert tip 22, and a screw member 24 for fixing the insert tip 22 and the tip breaker 23 to the tool holder A. Become. A through hole 25 for passing the screw member 24 is formed in the center of the insert tip 22. In the center of the chip breaker 23, a support hole 26 is formed so as to penetrate the screw member 24 and support the head portion 241 of the screw member 24, and the end surface is formed on the rake face 32. The lower surface surface 242 of the head of the screw member 24 is formed in a convex cone shape, and the support hole 26 is formed in a concave cone shape suitable for the convex cone shape.

To use the cutting tool 21 with a tip breaker, a screw member 24 is passed through a through hole 25 and a support hole 26 formed in the center of the insert tip 22 and the tip breaker 23, and a screw provided in the tool holder A is provided. The screw member 24 is screwed into the hole. As a result, the chips of the work material cut by the insert insert 22 are processed by the rake face 32 of the chip breaker 23, and the chip processing defects caused by the conventional clamp-on type can be eliminated. ..

Further, since it is not necessary to have a plurality of insert tips depending on the work material and the cutting conditions, the problem of the inventory cost of the insert tips can be solved.

The insert tip 22 and the tip breaker 23 are provided with a detent structure in order to prevent the tip breaker 23 from detenting during cutting. As a detent structure, for example, a hemispherical, conical or cylindrical recess 27 is formed on one of the facing surfaces of the insert tip 22 and the tip breaker 23, and the other is a hemispherical, conical or circular recess 27 that fits the recess 27. It is preferable to form the columnar convex portion 28. By fitting the detent structure provided on the insert tip 22 with the detent structure provided on the tip breaker 23, the rotation of the tip breaker 23 with respect to the insert tip 22 is prevented. The tip breaker 23 and the insert tip 22 are positioned and fixed by the detent structure and the head portion 241 of the screw member 24 and the support hole 26 formed in the tightening structure.

11 ... Cutting tool 12 ... Insert tip 13 ... Chip breaker 15 ... First screw member 16 ... Second screw member 122 ... Through hole 15a ... Head 121 ... Support portion 21 ... Cutting tool 22 ... Insert tip 23 ... Chip breaker 24 ... Screw member 32 ... Scoop surface A ... Tool holder

Claims (2)

A first screw member for fixing the insert tip to the tool holder and a second screw member for attaching the tip breaker to the first screw member, as well as having an insert tip and a tip breaker mounted on the insert tip in an overlapping manner. The insert tip has a support hole having a support portion for penetrating the first screw member and supporting the head of the first screw member, and the top surface of the head of the first screw member has a support hole. A support hole having a screw hole for screwing the second screw member, and the tip breaker having a support portion for penetrating the second screw member and supporting the head of the second screw member. A cutting tool characterized by having. The insert tip includes a tip breaker that is mounted on top of the insert tip, and a screw member that fixes the insert tip and the tip breaker to the tool holder, and the insert tip penetrates the screw member. The tip breaker is a cutting tool having a through hole and a support hole having a support portion that penetrates the screw member and supports the head of the screw member.

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