JP2001252802A - Throwaway tip holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means for saving the trouble for searching for a spare screw and taking out a screw corresponding to the screw specification when a screw for fitting a throwaway tip to a holder is damaged to be replaced. SOLUTION: In this turning cutting or rotary cutting tool fixing a throwaway tip 2 by the screw 5, a spare screw 7 is screwed on the holder main body 1, and screw specifications of a stored female screw 6 are the same as those of the screw 5 for fixing the throwaway tip 2, thereby preventing a trouble due to mismatch in screw specifications in replacing the screw 5, and saving the trouble of searching for a screw put in a separate storage place.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning tool or a rotary cutting tool holder for fixing a throw-away insert with a screw.

[0002]

2. Description of the Related Art It is well known that in a turning tool or a rotary cutting tool capable of changing a cutting edge, a throw-away tip serving as the cutting edge is fixed to a holder with a screw. Since the machine screws are often damaged or lost during the tightening operation, spare screws are usually provided. Conventionally, the screws are stored in a different location, and when the screws need to be replaced, spare screws are ordered from the storage location.

[0003]

However, in the method of storing screws in another place, spare screws are often out of stock, or screws having different screw pitches are attached to the holder, and the screws or the holder are damaged. There was a problem.
In addition, there was a loss of walking and a loss of replacement time in order to search for a screw in a storage location. The present invention provides a means for overcoming these problems.

[0004]

SUMMARY OF THE INVENTION In a turning tool or a rotary cutting tool for fixing a throw-away insert with a screw, a female screw for storing a spare screw by screwing a spare screw into a holder main body is used. The same screws as those for fixing the throw-away tip of the main body are used to prevent troubles caused by mismatch of screw specifications in screw replacement work, and to save trouble of searching for screws in a separate storage location.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment relating to a turning tool will be described. FIG. 1 shows a plan view of a first embodiment in which the present invention is applied to a turning tool. FIG. 1 shows a turning bit having a typical screw-on type clamping mechanism. At the tip of a bit holder 1 serving as a holder, a mounting seat 3 for a throw-away tip 2 is provided. The rear end of the throw-away tip 2 is positioned in contact with the step 4 on the mounting seat 3 side, and is fixed to the mounting seat 3 by screws 5 penetrating the throw-away tip 2.

In the first embodiment, a female screw 6 having the same screw diameter and screw pitch as the screw 5 is formed in a part of the tool holder 1 shown in FIG. Then, a spare screw 7 is screwed in, and the screw 5 is replaced with the screw 5 which cannot be sufficiently tightened due to a wrench hole in the screw head. The female screw 6 may be provided at least as many as the number of the throw-away inserts 2, and may be either an end face or a side face as long as the face does not hinder the attachment and detachment of the tool holder 1 to the turning machine. When the cutting tool is stationary, such as a turning tool, a simple blind hole may be provided instead of the female screw 6 and held by magnetism, but there is a drawback that the screw specification cannot be confirmed.

FIG. 2 is a plan view showing a second embodiment in which the present invention is applied to a cartridge unit for turning. In FIG. 2, the cartridge unit 10 is engaged with the spigot 12 of the holder 11, which is a holder, and the projection 13 of the rotation stopper, and is fixed to the holder 11 by the mounting bolt 14. At the tip of the cartridge unit 10, a mounting seat 3 for the throw-away chip 2 is provided. The side surface of the throw-away tip 2 is positioned in contact with the steps 4a, 4b on the mounting seat 3 side, and is fixed to the mounting seat 3 by screws 5 penetrating the throw-away tip 2.

On the other hand, a female screw 6 having the same screw diameter and screw pitch as the screw 5 is formed in a part of the holder 11,
There, a spare screw 7 is screwed. If the wrench hole on the screw head of the screw 5 drops and it becomes impossible to perform sufficient tightening work, replace it with a spare screw 7. The female screw 6 may be provided at least as many as the number of the throw-away inserts 2, and may be any one of an end face and a side face as long as the face does not hinder attachment and detachment of the holder 11 to and from the turning machine.

Next, an embodiment relating to a rotary cutting tool will be described. FIG. 3 shows a third embodiment in which the present invention is applied to a face milling machine.
FIG. In FIG. 3, a plurality of mounting seats 3 of the throw-away tip 2 are provided at a tip of a cutter body 20 which is a holding tool. The side surface of the throw-away tip 2 is positioned in contact with the steps 4a, 4b on the mounting seat 3 side, and is fixed to the mounting seat 3 by screws 5 penetrating the throw-away tip 2. 21 is a chip pocket.

On the other hand, a part of the cutter body 20 has a screw 5
And a female screw 6 having the same screw diameter and screw pitch as above, and a spare screw 7 is screwed therein. If the wrench hole on the screw head of the screw 5 drops and it becomes impossible to perform sufficient tightening work, replace it with a spare screw 7. It is sufficient that the number of female screws 6 is equal to the number of the throw-away tips 2. However, since all screws 5 do not become unusable at once at the time of replacement, a plurality of spare screws 7 may be prepared. The installation location of the female screw 6 may be either the end face or the side face as long as the face does not hinder the attachment and detachment of the cutter body 20 on the rotary cutting machine side.

FIG. 4 shows a side view of a fourth embodiment in which the present invention is applied to a drill. In FIG. 4, a plurality of mounting seats 3 of the throw-away tip 2 are provided at a tip of a drill body 30 as a holder. Indexable Tip 2
Are positioned in contact with the steps 4 a and 4 b on the mounting seat 3 side, and are fixed to the mounting seat 3 by screws 5 penetrating the throw-away tip 2.

On the other hand, a part of the drill body 30 has a screw 5
And a female screw 6 having the same screw diameter and screw pitch as above, and a spare screw 7 is screwed therein. If the wrench hole on the screw head of the screw 5 drops and it becomes impossible to perform sufficient tightening work, replace it with a spare screw 7. The female screw 6 may be provided at least as many as the number of the throw-away tips 2, and may be any of the end face and the side face as long as the face does not hinder the attachment / detachment of the drill body 30 to the rotary cutting machine.

FIG. 5 is a side view of a fifth embodiment in which the present invention is applied to an end mill. In FIG. 5, a mounting seat 3 for the indexable insert 2 is provided at a tip of an end mill body 40 which is a holder. A side surface of the throw-away tip 2 is positioned in contact with the steps 4a, 4b on the mounting seat 3 side, and a screw 5 penetrating the throw-away tip 2 is provided.
Is fixed to the mounting seat 3. Reference numeral 51 denotes a chip pocket.

On the other hand, a female screw 6 having the same screw diameter and screw pitch as the screw 5 is drilled in a part of the end mill body 40, and a spare screw 7 is screwed there. If the wrench hole on the screw head of the screw 5 drops and it becomes impossible to perform sufficient tightening work, replace it with a spare screw 7. The female screw 6 may be provided at least as many as the number of the throw-away tips 2, and may be any one of an end face and a side face as long as the face does not hinder attachment and detachment of the end mill body 40 to the rotary cutting machine. In addition, the present invention can be easily applied to rotary cutting tools such as a side cutter, a boring quill and a boring quill cartridge unit. That is, the present invention can be easily applied to any cutting tool having a holder to which the indexable insert 2 is fixed.

[0015]

According to the present invention, in a cutting tool having a holder to which a throwaway tip is fixed, a female screw having the same screw specification as a screw for fixing the throwaway tip is provided.
Mismatched screw specifications when replacing a screw that has been drilled in the holder and screwed into it and a spare screw has been screwed into it, and the screw head wrench hole has been dripped, preventing sufficient tightening work. In addition to preventing troubles caused by the above, the trouble of searching for screws in a separate storage location can be omitted.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment in which the present invention is applied to a turning tool.

FIG. 2 is a plan view of a second embodiment in which the present invention is applied to a cartridge unit for turning.

FIG. 3 is a side view of a third embodiment in which the present invention is applied to a face milling machine.

FIG. 4 is a side view of a fourth embodiment in which the present invention is applied to a drill.

FIG. 5 is a side view of a fifth embodiment in which the present invention is applied to an end mill.

[Explanation of symbols]

 Reference Signs List 1 byte holder 2 throw-away tip 3 mounting seat 4, 4a, 4b step 5 screw 6 female screw 7 spare small screw 10 cartridge unit 11 holder 12 spigot 13 projection 14 mounting bolt 20 cutter body 21, 41 chip pocket 30 drill body 40 End mill body

Claims (4)

[Claims] A cutting tool for fixing a throw-away tip with a screw, comprising a means for storing a spare screw in the holder. 2. The indexable tip holding tool according to claim 1, wherein the holding tool is a turning tool such as a turning tool or a turning cartridge unit. 3. The indexable tip holder according to claim 1, wherein the holder is a rotary cutting tool such as a face mill, a drill, or an end mill. 4. A screw according to claim 1, wherein a female screw for screwing and storing a spare screw has the same screw specification as a screw for fixing a throw-away tip of the main body of said holder. The indexable tip holder according to any one of the above.