JPH0839350A - Reamer - Google Patents

Abstract

PURPOSE:To prevent burring in a reamer having a diamond sintered body tip on the top end side of a body to ream a work by the diamond sintered body tip, and enhance the hardness of the reamer. CONSTITUTION:A diamond sintered body tip 5 is provided on the top end side of a body. A first cutting edge 5a is formed on the top end side of the diamond sintered body tip 5, and a second cutting edge 5b situated closer to the outside from the first cutting edge 5a is provided in the rear of the first cutting edge 5a of the diamond sintered body tip 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reamer, and more particularly to a reamer capable of suppressing burr formation.

[0002]

2. Description of the Related Art A reamer used for reaming has a diamond sintered body tip on the tip side of a blade portion formed along the length direction of a main body. FIG. 5 (a) shows such a conventional reamer, in which W is a work and 100
Is a machining hole for the work W, 101 is the tip of the reamer blade, 1
Reference numeral 02 indicates a diamond sintered body chip, and L indicates a rotation center line of the reamer.

In such a conventional reamer, the reamer is rotated about the rotation center L and is propelled rightward in FIG. 5A to machine the machining allowance 103 of the machining hole 100.
After the reamer 101 penetrates the processed hole 100, the processed hole 1
It is known that a burr 104 is generated at the edge of 00 as shown in FIG.

Therefore, a reamer as shown in FIG. 6 has been proposed to prevent such burr. Figure 6
6A is a side view of the reamer 200 on the front end side, FIG. 6B is a view taken in the direction of arrow b of FIG. 6A, and FIG. 6C is a sectional view taken along line c-c of FIG. 6B. , Reamer 2 as shown in these drawings
, 202 ... are formed on the outer periphery of the blade 00, and the diameter of the blade 201 is larger than that of the blade 202 (for example, the difference A in the diameter is 0.02 mm). A chamfered portion 203 is formed at the tip end of the portion 201.

In the reamer 200 having such a shape, the reamer 200 rotates about the rotation center L as shown in FIG.
Proceed to the right of to ream the machining hole of the workpiece. Then, first, the end portion of the blade portion 202 shown by B in FIG. 6C penetrates the processing hole, and at this time, burrs are generated at the edge of the processing hole. However, this burr is cut by the end of the chamfered portion 203 of the blade 201 that is propelled immediately after, and as a result, it is possible to prevent the occurrence of burr.

[0006]

By the way, in the reamer as described above, it is necessary to form the blade portions 202 ... With a smaller diameter than the blade portions 201 .... I am doing so. That is, first, the blade portions 201 and 202 are formed to have the same diameter, and then the reamer 200 is rotated within the range of L2 in FIG. 6B to grind the blade portion 202 to reduce the diameter. . However, such a grinding process is possible in the case where the blade portion 202 is made of cemented carbide, but it is not possible in the case of diamond. Therefore, in the conventional case, a reamer having a high hardness cannot be formed and a long-term There was a problem that you could not use.

[0007]

In order to solve the above problems, the present invention provides a diamond sintered body tip on the tip side of a main body, and forms a first cutting edge on the tip side of this diamond sintered body tip. At the same time, a second cutting edge protruding outward from the first cutting edge is provided behind the first cutting edge of the diamond sintered body chip.

[0008]

Operation: The reamer propels the machining hole while rotating, and first, when the first cutting edge penetrates the machining hole, burrs are generated. Behind the first cutting edge, the burrs are formed. Also, since the second cutting edge located on the outer side scrapes this burr, it is possible to prevent the burr from occurring as a result. Since both the first blade and the second blade are formed on the diamond sintered body chip, it is possible to form a reamer having high hardness.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall view of the reamer, and FIG. 2 is a view from the direction of arrow 2 in FIG.
Reference numeral 3 denotes a blade portion, and the detachable portion 2 is detachably attached to a spindle (not shown).

On the outer periphery of the blade portion 3 of the reamer 1, cutting blades 4 are formed along the lengthwise direction of the blade portion 3.
Is composed of three cutting blades 4a, 4b, 4c having different diameters in three stages, and diamond sintered body chips 5, 6, 7 are attached to the side surfaces on the front end side of the respective cutting blades 4a, 4b, 4c. .
The reamer 1 is rotated about the rotation center L to ream the work W shown in FIG.
Is a processed hole 8 and diamond sintered chip 6 is a processed hole 9
Ream each.

FIG. 3 is an enlarged side view of the diamond sintered body tip 5. As shown in this figure, a first cutting edge 5a is provided on the front end side of the diamond sintered body tip 5, and the first cutting edge 5a is provided. A second cutting edge 5b located radially outward (downward in FIG. 3) of the first cutting edge 5a is provided behind the cutting edge 5a.

When the first cutting edge 5a of the diamond sintered body chip 5 penetrates the processing hole 8 during the reaming,
As shown in FIG. 4, burrs 10 are formed on the edge of the processed hole 8, but the second cutting edge 5b located outside the first cutting edge 5a.
Penetrates through the machining hole 8 following the first cutting edge 5a, and the second cutting edge 5b removes the burr 10.

As described above, according to the structure of this embodiment, the burrs generated by the reaming can be automatically removed, and as a result, the burrs can be prevented from occurring. Further, it is possible to form a diamond having a high hardness into the shape of the diamond sintered body tip 5 shown in this embodiment, that is, the diamond sintered body tip 5 having a high hardness is formed on the first cutting edge 5.
a, it is possible to form the second cutting edge 5b. Therefore, according to this embodiment, a reamer having a high hardness can be formed and it is possible to endure long-term use.

[0014]

As described above, according to the present invention, it is possible to prevent burrs from being generated during the reaming process, and both the first blade and the second blade are formed on the diamond sintered body chip. Therefore, it becomes possible to form a reamer having high hardness.

[Brief description of drawings]

[Fig.1] Overall view of reamer

FIG. 2 is a view on arrow 2 of FIG.

FIG. 3 is an enlarged view of part A of FIG.

FIG. 4 is a sectional view of the work.

FIG. 5 is an enlarged view of a diamond sinter chip portion of a conventional reamer.

6A and 6B are views showing a conventional reamer, in which FIG. 6A is a side view, FIG. 6B is a view in the direction of arrow b in FIG. 6A, and FIG.
c line sectional view

[Explanation of symbols]

 1 ... Reamer 5 ... Diamond sintered body chip 5a ... First cutting edge 5b ... Second cutting edge

Claims (1)

[Claims] 1. A diamond sintered body chip is provided on a tip side of a main body, a first cutting edge is formed on a tip side of the diamond sintered body chip, and the diamond sintered body chip is cut from the first cutting edge. A reamer having a second cutting edge located rearward of the first cutting edge.