JPH0637882Y2 - Cutting tool polishing equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cutting tool for processing a work such as an engine component, and particularly to a reamer for finishing after preparation of a prepared hole or a countersink cutter for performing a counterboring process on an Inuki hole The present invention relates to a polishing device for cutting tools such as.

[Conventional technology]

Generally, as a cutting tool for processing engine parts, a cutting tool such as a reamer that performs finishing after preparation of a pilot hole or a countersink cutter that performs a counterboring process on an Inuki hole is used. It is necessary to re-polish regularly because the cutting edge will be damaged while it is in use.

Conventionally, in order to re-polish the cutting tool as described above, as shown in the conceptual diagram of the main part of FIG. 4, for example, a cylindrical cutting tool, for example, a shallow center hole 1a, 1b formed at both ends of the reamer 1. The tip ends of the conical centers 2 and 3 are fitted into the inside, the both ends of the reamer 1 are held between the conical centers 2 and 3, and the grinding stone 4 is rotated from the side to The shaded portions 5 and 6 shown in the figure are deleted to re-form a new cutting edge.

[Problems to be solved by the invention] According to the conventional polishing apparatus described above, the reamer 1 is supported by inserting the tip of the conical center 2 into the shallow center hole 1a. When the center hole 1a and its vicinity are polished, the reamer 1 cannot be supported by the center 2, and therefore the center hole 1a and its vicinity cannot be polished. Therefore, the reamer 1 after polishing is shown in FIG. Thus, the cylindrical small-diameter portion 1c including the center hole 1a is formed at the tip of the cutting edge. Reamer 1 like this
If a small cylindrical portion 1c is formed at the tip of the
As shown in FIG. 7, the bottom of the prepared hole 3a formed in the work 3
When 3b is shallow, there is a problem that the cylindrical small-diameter portion 1c formed at the tip of the cutting edge of the reamer 1 comes into contact with the bottom 3b and the finish machining of the prepared hole 3a becomes impossible. If the cylindrical small-diameter portion 1c abuts and the finishing work of the prepared hole 3a becomes impossible, it is considered that the life of the cutting tool itself has expired and is discarded. The number of times cannot be increased unnecessarily (if it is increased, the length of the cylindrical small-diameter portion 1c described above is further increased), and thus the life of the cutting tool is very short, which is a fatal difficulty.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a cutting device for a cutting tool, in which the number of times of polishing is increased to extend the life of the cutting tool as much as possible.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, according to the present invention, a center tool is inserted into a center hole formed in an end portion of the cutting tool to support the cutting tool, and the supported cutting tool is polished with a grinding stone. In the polishing apparatus, the center hole is formed in a deep hole, and the center tip portion is formed long so that the tip of the center abuts on the bottom of the center hole formed in the deep hole. There is.

[Action]

According to the above-described polishing apparatus, the center hole is a deep hole, and the tip of the center abuts on the bottom of the deep hole. All can be deleted.

〔Example〕

 An embodiment of the polishing apparatus according to the present invention will be described in detail below.

FIG. 1 is a conceptual broken-away view of an essential part of a polishing apparatus 10 for a cutting tool according to the present invention, in which the same parts as those in FIGS. 4 to 6 are designated by the same reference numerals.

In this polishing device 10, of the center holes 11a, 11b formed at both ends of the cylindrical reamer 11, for example, the reamer 11, the center hole 11a formed at the tip on the side where the cutting edge is formed is Due to this, the bottom is deeply formed to a position where the cutting edge can be re-formed. The other center hole 11b
Has a shallow bottom as in the conventional case.

On the other hand, of the centers 12 and 13 that support the reamer 11, the center 12 that is inserted into the center hole 11a formed in the deep hole is used.
Has its tip portion 12a formed to have a smaller diameter than other portions,
Further, the tip 12b is a center hole 1 formed in the deep hole.
It is formed long enough to come into contact with the bottom 11c of 1a.

According to the polishing apparatus 10 described above, the polishing stone 4 shown in FIG. 1 is used to rotate the polishing stone 4 from the side thereof, and the shaded portions 14 and 15 at the tip of the reamer 11 are deleted as shown in FIG. When a new blade edge is re-formed by contacting the center hole 11a with the center tip 12b fitted into the hole, as shown in FIG. Since it is located far to the left of the drawing, it is possible to completely remove the tip portion of the cutting edge with the grinding stone 4 as shown by the hatched portion 15 at the tip of the reamer 11 as shown in FIG. This is because the reamer 11 is maintained in a state of being sandwiched between the centers 12 and 13 even if the tip of the cutting edge of the reamer 11 is completely removed by the grinding stone 4.

Therefore, as shown in FIG. 3 showing the reamer 11 after the repolishing process, no projection other than the cutting edge is formed at the tip portion of the reamer 11, that is, the portion indicated by the arrow A.

Therefore, even in the case of the shallow pilot hole 3a formed in the work 3 shown in FIG. 7, when finishing is performed using the reamer 11 after re-polishing shown in FIG. 3, the tip of the reamer 11 is Is a pilot hole
It does not come into contact with the bottom 3b of 3a, so that finishing can be performed.

[Effect of device]

As described below, in the polishing apparatus of the present invention, the depth of the center hole of the cutting tool is formed in a deep hole, and the length of the center tip is formed so as to abut the bottom of the center hole of the deep hole. Thus, the tip of the cutting tool can be completely removed by the grinding stone up to the vicinity of the bottom of the center hole of the deep hole, so that the number of times of polishing can be increased and the life of the cutting tool can be remarkably extended.

[Brief description of drawings]

FIG. 1 is a conceptual view of the main part of a polishing apparatus according to the present invention,
FIG. 2 is a conceptual view of a main part of a polishing device according to the present invention, FIG. 3 is a view showing a cutting tool after polishing, FIG. 4 is a schematic view of a main part of a conventional polishing device, and FIG. FIG. 6 is a conceptual view of a main part showing a polishing portion of a conventional polishing apparatus, FIG. 6 is a view showing a cutting tool after polishing by a conventional polishing apparatus, and FIG. 7 is a view of processing by the cutting tool after polishing. 4 ... Polishing stone, 11 ... Cutting tool (reamer), 11a ... Center hole, 12 ... Center, 12a ... Center tip, 12b ...
…tip.

Claims (1)

[Scope of utility model registration request] 1. A cutting tool polishing apparatus, wherein a center is inserted into a center hole formed in an end portion of a cutting tool such as a reamer to support the cutting tool, and the supported cutting tool is polished with a grinding stone. The center hole is formed as a deep hole, and the length of the center tip portion is formed so that the tip of the center abuts on the bottom of the center hole formed in the deep hole. Polishing equipment for cutting tools.