JPH09229038A - Screw member, screw fastening construction, and cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fixedly provide an insert tip on a tool main body through a hard sheet at high positional accuracy and integrately, without complicated working on the tool main body and the hard sheet, so as to obtain sufficient strength and durability. SOLUTION: An external thread part 20a of a screw member 20 is threadedly engaged with the internal thread 14a so as to fix a hard sheet 14 on a tip fitting seat 18, an external screw member 22 is threadedly engaged with the internal screw part 20d provided on the extreme end of the screw member 20, and hence an insert tip 16 is fixed on the hard sheet 14. The screw member 20 is provided with a cylindrical part 20c, it is nicely fitted in a large diameter through hole 18a and centered, meanwhile, the head part 22b of an external screw member 22 is a flush head and received in a dish-like receiving hole 16c, and hence the insert tip 16 is centered and positioned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw member integrally having a male screw portion and a female screw portion, a screw fastening structure using the screw member, and a cutting tool having the screw fastening structure.

[0002]

2. Description of the Related Art As a method for integrally fixing three members by using screw fastening means, for example, Japanese Patent Publication No. 6-41056.
Various proposals have been made as described in Japanese Patent Laid-Open No. 7-241717. Japanese Patent Examination 6-41056
The method described in the publication is used when a large number of insert tips (throw-away tips) 106 are fixedly mounted on the tool body 102 via the cartridges 104 as in the taper shank type multi-blade milling machine 100 shown in FIG. As is clear from the sectional view perpendicular to the axis shown in FIG. 5, the tip mounting seat 108 provided on the tool main body 102.
The first screw member 110 is used to fix the cartridge 104, and the second screw member 112 is used to fix the insert tip 106 to the cartridge 104. The cartridge 104 not only prevents the tool body 102 from being damaged by the breakage of the insert tip 106, but also has the function of adjusting the cutting edge position of the insert tip 106. Also, JP-A-7-24
In the method described in Japanese Patent No. 1717, as shown in FIG. 6, when the hard sheet 116 is used instead of the cartridge 104, the hard sheet 1 is formed by using the first screw member 118.
After the 16 is fixed to the tip mounting seat 108, the insert tip 106 is placed on the hard sheet 116, and the holding plate 120 having a wedge action is fastened to the tool body 102 using the second screw member 122. The holding plate 1
20 and the hard sheet 116 between the insert tip 10
6 is clamped and integrally fixed.

By the way, in the former case, the cartridge 1
In addition to requiring a complicated member 04, it is necessary to perform processing for arranging the cartridge 104 on the tool main body 102, and by the processing, the tool main body 102 is processed.
There was a problem that the strength of the was decreased. Also in the latter, the pressing plate 120 is required, the tool main body 102 needs to be processed to dispose the pressing plate 120, and the processing causes a similar problem that the strength of the tool main body 102 decreases. Moreover, since the pressing plate 120 is arranged on the surface of the insert chip 106, a chip storage portion (chip pocket) above the insert chip 106.
It also reduces the flow rate and impairs the chip flow.

On the other hand, in Japanese Utility Model Laid-Open No. 5-74727, as shown in FIG. 7, the insert tip 106 is placed on a hard sheet 126 that engages with the tool body 102, and a single screw is used. The member 128 allows the rigid sheet 126 and the insert tip 106 to be attached to the tool body 10.
A method of integrally fixing to No. 2 is proposed.

Further, in Japanese Utility Model Laid-Open No. 5-53809,
Using a screw member with an eccentric head, a ring-shaped sheet member is pressed against the wall surface of the chip mounting seat by the action of a cam and fixed, and a plug screw is screwed into the screw member to insert the insert chip. A method of fixing on a sheet member has been proposed. That is, as shown in FIG. 8, an eccentric pin 134 is attached to the mounting screw hole 132 of the chip mounting seat 130,
The eccentric head 136 is projected from the mounting seat bottom surface 138, and the contact portion 142 farthest from the central axis O of the cam surface 140 on the outer peripheral surface of the head 136 is screwed toward the mounting seat wall surface 144 side. . A seat member 148 is attached to the chip mounting seat 130 by inserting a head portion 136 into the through hole 146 and abutting the abutting portion 142 on the inner peripheral surface thereof. The portion between the through hole 146 and the peripheral surface 150 is sandwiched between the sheet member 148 and
Is pressed against the wall surface 144 side.
Further, insert tip 10 is attached to tip mounting seat 130.
6 brings the seating surface 152 into close contact with the seat member upper surface 154,
The clamp screw 156 is detachably mounted by being screwed into the clamp screw hole 158 of the eccentric pin 134.

[0006]

However, even in the method of FIG. 7, it is necessary to provide the hard sheet 126 and the tool main body 102 with the engaging portions 126a and 102a, respectively, and complicated processing is required, which is not always sufficient. It wasn't possible. In the method described in Japanese Utility Model Laid-Open No. 5-53809, it is inevitable that the sheet member has a small thickness (in the radial direction) and a large gap is formed on the side opposite to the eccentric head, and it is difficult to obtain sufficient strength. In addition, the contact of the eccentric head (cam) changes with use, and it is difficult to obtain sufficient durability, and the screw member is only loosened by the action of the cam, so it is easy to loosen due to chatter vibration. However, the processing accuracy may be significantly impaired.

More specifically, referring to FIG. 8, the sheet member 148 may be provided with the through hole 146, while the sheet member 148 has the through hole 146 and the peripheral surface between the head 136 and the wall surface 144 of the eccentric pin 134. Since the portion between 150 and 150 is sandwiched and the sheet member 148 is pressed against the wall surface 144 side, the sheet member 148 penetrates on the opposite side with the central axis O of the contact portion 142 of the through hole 146 sandwiched therebetween. It is essential to have a gap between the wall surface of the hole 146 and the wall surface of the eccentric pin 134, which causes damage to the sheet member 148, and the eccentric pin 134 is screwed to the tool body 102. , Mounting screw holes 132 for the chip mounting seat 130
The eccentric pin 134 is attached to the eccentric head 136, and the eccentric head 136 is projected from the mounting seat bottom surface 138.
To secure the phase in which the contact portion 142 farthest from the central axis O is screwed toward the mounting seat wall surface 144 side,
It's extremely difficult. That is, when the axial thickness of the sheet member 148 and the head thickness of the eccentric pin 134 are substantially the same, the rising position of the male screw of the eccentric pin 134 and the tool main body 1
No. 02, the rising position of the screw must be a strictly constant position, or else the eccentric pin 1
It is essential that the head thickness of 34 is less than the thickness of the sheet member 148 by one pitch or more of the pitch P of the external thread of the eccentric pin 134, and the eccentric head 136 with weak strength is obtained.

Further, the cam curvature of the cam surface 140 on the outer peripheral surface of the head of the eccentric pin 134 is such that the portion between the through hole 146 and the peripheral surface 150 is sandwiched between the head 136 and the wall surface 144, or is sandwiched. It must be a cam rise just to release the insert, and if it is too large, the insert will be loosened easily due to vibrations and the like caused during use of the tool.
At the same time, the sheet member 148 is damaged, and if the cam rise is too small, the sandwiching force is small, and the contact portion 142 is easily worn and deformed, which makes it difficult to withstand repeated use. In addition, the manufacturing of the eccentric pin 134 is complicated and uneconomical.

The present invention has been made in view of the above circumstances, and an object thereof is to integrate three members into a simple and compact unit with high positional accuracy without performing complicated processing. Can be fixed and has sufficient strength,
It is to ensure durability.

[0010]

In order to achieve such an object, the first invention is (a) a first member provided with an internal thread, and (b) a diameter larger than the root diameter of the internal thread. A second member provided with a large-diameter through hole, (c) a screw member used for integrally fixing the female screw and the large-diameter through hole in a state where they are located substantially coaxially, (d) An external thread portion that penetrates the large-diameter through hole and is screwed into the female thread, and (e) an opening of the large-diameter through hole by screwing the external thread portion into the female thread. A head which is brought into contact with the peripheral portion and integrally fixes the first member and the second member, and (f) a predetermined screw member provided at an axial end portion and screwed together. And a tool locking portion with which the rotary tool is engaged such that the rotary tool cannot rotate relative to each other.

The second invention is (a) the first invention provided with an internal thread.
A member, (b) a second member provided with a large-diameter through hole having a diameter larger than the root diameter of the female screw, (c) a third member provided with a mounting through-hole, (d) A screw member used to integrally fix the female screw, the large-diameter through hole, and the mounting through-hole in a state where they are positioned substantially coaxially, and A male screw part that is screwed into a female screw,
(f) The male thread is screwed into the female thread so that the male thread is brought into contact with the peripheral edge of the opening of the large-diameter through hole, and the first member and the second member are integrally fixed. Head to
(g) In order to integrally fix the third member to the first member and the second member by screwing the male screw member arranged to penetrate the mounting through hole, Since the threaded portion is provided at the end in the axial direction with a root diameter smaller than that of the mounting through hole, and (h) the tool engaging portion with which the rotary tool is engaged so as not to rotate relative to each other is integrally provided coaxially. It is characterized by

According to a third invention, in the screw member of the first invention or the second invention, a large-diameter penetration is made between the male screw portion and the head portion with a diameter dimension substantially the same as that of the large-diameter through hole. It is characterized in that a cylindrical portion is provided which is fitted in the hole to position the second member.

A fourth invention is the screw member according to any one of the first invention to the third invention, wherein the female screw portion is provided at an end portion on the male screw portion side, and the first member has the above-mentioned structure. A fifth aspect of the invention is characterized in that a female screw is provided in the through hole, and the fifth invention is characterized in that the female screw part is provided at the end portion on the head side. The sixth invention is the female screw part thereof. Is provided so as to penetrate in the axial direction from the end portion on the male screw portion side to the end portion on the head portion side.

A seventh aspect of the present invention is the external thread member according to any one of the first to sixth aspects, wherein the head portion has a non-circular outer peripheral shape and also serves as the tool locking portion. It is characterized in that a rotating tool is engaged with the outer periphery of the head and rotated.

An eighth invention is the external thread member according to any one of the first invention to the sixth invention, wherein the tool locking portion is provided on an end face in the axial direction so that the rotary tool is engaged so as to be relatively non-rotatable. It is characterized by a locking recess.

In a ninth aspect of the present invention, in the male thread member of the eighth aspect, the head portion is provided at an end portion on the side opposite to the screwing direction of the male thread portion, and the head portion is locked with the head portion. The recess is provided, and the head has a non-circular outer peripheral shape, and can be used as the tool locking portion.

A tenth invention is the screw member according to the second invention or the third invention, wherein (a) the head portion is provided at an end portion on the side opposite to the screwing direction of the male screw portion, A locking recess is provided in the head as the tool locking portion, and the bottom of the locking recess is provided with the above-mentioned male member for integrally fixing the third member to the second member side. While the internal thread portion to which the screw member is screwed is provided, (b)
An accommodation hole for accommodating the head portion is provided in an opening located on the opposite side of the large-diameter through hole from the first member.

The eleventh invention is the second invention, the third invention, and the fifth invention.
In the screw member of the invention, the eighth invention, or the tenth invention, the first member is a tool main body of a cutting tool, and the second member is a sheet member arranged at a tip mounting seat of the tool main body, The third member is an insert chip disposed on the sheet member, and the twelfth invention is the screw member according to any one of the second invention to the fourth invention and the sixth invention to the ninth invention, wherein: The second member is a tool body of a cutting tool, the first member is a seat member arranged at a tip mounting seat of the tool body, and the third member is an insert chip arranged on the seat member. The sheet thread is provided with the female thread in the through hole.

A thirteenth aspect of the invention is (a) a first member provided with an internal thread, and (b) a second member provided with a large-diameter through hole having a diameter larger than the root diameter of the internal thread. c) A screw fastening structure in which (3) the third member provided with the mounting through hole is integrally fixed to the female screw, the large-diameter through hole, and the mounting through hole in a state where they are substantially coaxial. (E) The male threaded portion to be screwed into the female thread and the threaded portion, which is provided at the end in the axial direction with a root diameter smaller than that of the mounting through-hole, prevent relative rotation of the rotary tool. The tool engaging portion to be engaged and the head portion having a larger diameter than the large-diameter through hole that generates a fastening force by screwing the male screw portion are coaxially and integrally provided. By passing through the large diameter through hole and being screwed into the female thread, and by contacting the head portion with the opening peripheral portion of the large diameter through hole, A screw member for integrally fixing one member and the second member, (f) a male screw portion screwed into the female screw portion of the screw member, and a head having a diameter larger than the mounting through hole And a tool locking portion which is provided on the head side and is engaged with the rotary tool so that the rotary tool cannot rotate relative to each other. The male thread portion penetrates through the mounting through hole and the female thread portion By being screwed into the threaded portion and the head portion is brought into contact with the opening peripheral edge portion of the mounting through hole,
And a male screw member for integrally fixing the third member to the first member and the second member.

A fourteenth aspect of the invention is the screw fastening structure according to the thirteenth aspect of the invention, wherein the large-diameter through-hole is formed between the male thread portion and the head portion of the threaded member in substantially the same diameter dimension. It is characterized in that there is provided a cylindrical portion which is fitted into the through hole to position the second member.

A fifteenth invention relates to a cutting tool,
(a) The screw member according to the eleventh invention or the twelfth invention,
(b) A male screw portion to be screwed into the female screw portion of the screw member, a head having a diameter larger than the mounting through hole, and a rotary tool provided on the head side so that the rotary tool cannot rotate relative to each other. A tool locking portion to be fitted is coaxially provided integrally, and its male screw portion penetrates the mounting through hole and is screwed into the female screw portion, and at the same time, at the peripheral edge of the opening of the mounting through hole. The seat member and the insert tip are integrally fixed to the tool body by using the male screw member that integrally fixes the insert tip to the tool body and the sheet member when the head portion is brought into contact with the tool body. It is characterized by being installed.

[0022]

According to the screw member of the first invention, the first member and the second member can be integrally fixed, and a predetermined screw member is screwed into the female screw portion, whereby the second invention is achieved. Similarly to the following screw members, the third member can be integrally fixed. In that case, in the present invention, since the female screw portion having the male screw portion is integrally provided with the female screw portion, the first and second members can be easily processed with high positional accuracy without complicated processing. And it can be fixed compactly. Further, the head of the screw member is brought into contact with the opening peripheral portion of the large-diameter through hole provided in the second member, and the second member and the first member are integrally fixed by the fastening force of the screw. Therefore, high mechanical strength and excellent durability are obtained.
Moreover, the possibility that the screw member will loosen is small.

According to the screw member of the second invention to the twelfth invention, the male screw portion is screwed into the female screw to integrally fix the first member and the second member, and the screw member is provided. Therefore, since it suffices to screw the screw member to the screw portion to integrally fix the third member, the first member to the third member can be easily and highly accurately positioned without complicated processing. Can be compactly and integrally fixed. Similar effects can be obtained in the screw fastening structures of the thirteenth invention and the fourteenth invention using such screw members, and the cutting tool of the fifteenth invention having the screw fastening structure.

Since the screw member of the third invention is provided with the cylindrical portion which is fitted in the large-diameter through hole, the first member provided with the female screw into which the male screw portion is screwed and the large-diameter member thereof. The second member provided with the through hole is integrally fixed with higher positional accuracy. The same applies to the screw fastening structure of the fourteenth invention.

In the screw member of the sixth aspect of the invention, since the female screw portion is provided so as to penetrate in the axial direction, a pair of male screw members are screwed from both sides of the screw member to integrally form a total of four members. Can be fixed. Further, the head of the screw member of the ninth invention is provided with a locking recess as a tool locking portion, and the outer peripheral shape of the head itself is also non-circular and can be used as a tool locking portion. Therefore, the screwing operation can be performed under various usage conditions.

In the screw member according to the tenth aspect of the invention, a locking recess is provided in the head as a tool locking part, and a female screw part is provided at the bottom of the locking recess so that the third member is integrally formed. Since the male screw member to be fixed is adapted to be screwed into the female screw portion, the screw member and the male screw member will be screwed in the same direction in the axial direction.
Excellent workability can be obtained.

The screw members of the eleventh and twelfth inventions are used in a cutting tool such as an insert tip type multi-blade milling cutter, when the insert tip is integrally fixed to the tool body via the sheet member. Since the insert tip can be easily and compactly fixed without complicated processing, the manufacturing cost of the tool is reduced and the insert tip and sheet member replacement work due to wear or damage can be done quickly. It can be carried out. With the cutting tool of the fifteenth invention, substantially the same effects can be obtained.

A screw member having a hole with a female screw axially penetrating the male screw main body is, for example, Japanese Utility Model Publication 5-1.
No. 6407 and Japanese Patent Application Laid-Open No. 7-4417, all of which are devised as locking bolts, a plurality of members can be fixed easily and compactly with high positional accuracy without complicated processing. The technical idea is completely different from the possible screw member of the present invention. Also, when fixing members using bolts and nuts, a loose taper male screw is engraved on the outer periphery of a cylindrical member having a female thread to be screwed into the bolt, and the taper There is also a method of using a nut that is screwed onto a male screw, but this is a completely different technique from the present invention.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Here, the head of the screw member is
When the male thread portion is screwed into the female thread of the first member, it is brought into contact with the second member to generate a fastening force, and has a larger diameter than the large diameter through hole through which the male thread portion penetrates. But
The cross section does not necessarily have to be circular, and at least a part of the cross section may be projected to the outer peripheral side of the large diameter through hole so as to be brought into contact with the opening peripheral edge portion of the large diameter through hole.
Similarly, with respect to the head portion of the male screw member, a part thereof may be similarly projected to the outer peripheral side of the mounting through hole and brought into contact with the peripheral edge portion of the opening of the mounting through hole. Also,
These heads may have a polygonal outer peripheral shape or are provided with locking recesses so that they also serve as tool locking parts.However, regarding the tool locking part of the screw member, In the case where the internal thread portion is provided on the head side, for example, the tool locking portion can be provided on the end portion on the side opposite to the head portion, that is, the external thread portion side.

It is desirable to provide a cylindrical portion between the head portion of the screw member and the male screw portion as in the third aspect of the invention, but when the cylindrical portion cannot be provided, such as when the axial dimension is short, etc. If the head is a countersink and a dish-shaped accommodation hole (counterbore hole, etc.) is provided in the opening peripheral portion of the large-diameter through hole of the second member, the engagement between the countersunk head and the accommodation hole The second member and the screw member are centered, and substantially the same positioning effect as in the case where the cylindrical portion is provided can be obtained. For the male screw member that is screwed into the female screw portion of the screw member, a cylindrical portion that has a diameter approximately the same as that of the mounting through hole and that is fitted properly into the mounting through hole should be provided between the head and the male screw portion. Although desirable, if the head is a dish head as described above, a centering effect similar to that in the case where the cylindrical portion is provided can be obtained. The cylindrical portion is not only disclosed in Japanese Patent Application Laid-Open No. 7-60528, but also JIS-B1175 (shoulder bolt with hexagonal hole) and hexagonal reamer bolt described in JIS-B0101 (thread term). Is also provided.

The female screw of the first member in the fourth invention may be provided so as to penetrate the first member, that is, over the entire length of the through hole, but may be provided only in a part of the through hole. The through hole may have a step whose diameter changes in the middle. The same applies to the twelfth invention.

When the female threaded portion is provided at the end portion on the male threaded portion side as in the fourth aspect of the invention, when the threaded member is screwed onto the female threaded portion, the threaded portion is also twisted so as to be self-tight. It is desirable to use screws having opposite directions, and it is desirable to use screws having the same twisting direction when a female screw portion is provided at the end portion on the head side as in the fifth aspect of the invention. In the sixth invention, the female screw portion is provided by penetrating the screw member in the axial direction, but the pair of female screw portions may be provided only at both ends of the through hole penetrating the screw member in the axial direction. Good, in that case, it is desirable to provide a pair of internal thread portions having opposite twist directions so that the screw member can be tightened freely.

As the tool locking portion, various forms can be adopted in which the rotary tool is engaged so as not to rotate relative to each other. The locking recesses of the eighth invention and the tenth invention are, for example, JIS-B117.
5 (hexagonal shoulder bolt) and JIS-
Equivalent to B1012 (cross hole for screws) cross holes and the sliding of a slotted screw, etc.
It is also shown in Japanese Patent No. 11 and Japanese Utility Model Laid-Open No. 7-1315. The tool locking portion may be a locking convex portion,
In that case, the outer peripheral shape of the head can be used as it is as the locking projection as in the seventh invention. When the head is used as a locking projection (tool locking part), for example, JIS-B
Hexagon head of 1180 (hexagonal bolt) and Japanese Patent Laid-Open No. 3-163
Head shape shown in Japanese Patent No. 207, JIS-B01
Square head as described in 01 (thread term), 12
It may be a point head. The tool locking portion may further include both a locking concave portion and a locking convex portion as described in, for example, Japanese Utility Model Laid-Open No. 12729/1993 (corresponding to the ninth invention). Tool locking portions may be provided at both ends of the.

A cutting tool according to a fifteenth invention is a rotary cutting tool such as an insert tip type multi-blade milling cutter and an end mill,
Alternatively, although it is an insert tip type cutting tool or other cutting tool, the screw members of the first to tenth inventions and the screw fastening structure of the thirteenth invention are also applied to coupling of a plurality of members in various fields other than the cutting tool. it can. For example, ceramics, resin or the like (second member) is fixed on the metal (first member) on which the female screw is tapped using the screw member of the present invention,
Furthermore, it is also effective for applications such as another third member fixedly mounted thereon by a male screw member. In particular, regarding the screw member of the first invention that does not require the third member, in the case of an ALC concrete building, a through hole is formed in the ALC concrete (second member) and the internal steel frame (first member) is tapped. The screw member of the present invention may be screwed, and then a hook bolt or the like (male screw member) may be screwed to the screw member. The first member and the second member such as the above may be integrally fixed, and a predetermined threaded component (male threaded member) may be screwed onto the flanged bolt. .

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the multi-blade milling machine 100 of FIG.
A cross-sectional view perpendicular to the tool axis showing a tip mounting structure in which an insert tip 16 is integrally fixed to a tool body 12 of an insert tip type multi-blade milling machine 10 similar to the above with a hard sheet 14 as a sheet member. 6 is a diagram corresponding to FIG. The multi-blade milling cutter 10 is an example of the cutting tool according to claim 15, and the plurality of hard sheets 14 and the insert tips 16 are respectively mounted on the plurality of tip mounting seats 18 provided on the tool body 12 with a screw member 20 and a male screw. It is fixed by the member 22. Further, this tip mounting structure is an example of the screw fastening structure of claims 13 and 14, and the screw member 20 is one of claims 1 to 4, 7 to 9, and 12.
3 is an example of the screw member of FIG.

The hard sheet 14 corresponds to the first member, has a rectangular plate shape, and is provided with a female screw 14a at its central portion, that is, over the entire length of the through hole. ing. The tool body 12 corresponds to a second member, and the tip mounting seat 18 is provided with a large-diameter through hole 18a having a diameter larger than the root diameter of the female screw 14a. Also, the insert tip 16 is the third
It corresponds to a member and has a rectangular plate shape and has a blade portion 16a, and the female screw 1
A mounting through hole 16b smaller than the inner diameter of 4a is provided. Then, the hard sheet 14 and the insert tip 16 have the female screw 14a and the mounting through hole 16b.
Is integrally fixed to the large-diameter through-hole 18a coaxially with the large-diameter through-hole 18a, and the posture around the axis is determined by the side wall 18b of the chip mounting seat 18.

On the other hand, the screw member 20 has the large-diameter through hole 1 described above.
A male screw portion 20 that penetrates 8a and is screwed into the female screw 14a.
a, a head portion 20b provided at an end portion of the male screw portion 20a on the side opposite to the screwing direction, the head portion 20b, and the male screw portion 2
0a, a cylindrical portion 20c having a cylindrical shape, and a threaded portion 20d provided at the end portion on the male screw portion 20a side,
Locking recess 2 as a tool locking part provided on the head 20b
And 0e are integrally provided on the same axis. The head portion 20b has a larger diameter than the large-diameter through hole 18a, and the male screw portion 20a is screwed into the female screw 14a, whereby the large-diameter through hole 18a is formed.
It is brought into contact with the lower side, that is, the peripheral edge of the opening on the side opposite to the hard sheet 14 to generate a fastening force, and the hard sheet 14 is integrally fixed to the chip mounting seat 18 in a state of being in close contact therewith. The cylindrical portion 20c has substantially the same diameter dimension (strictly, slightly smaller) as the large-diameter through hole 18a, and by being fitted into the large-diameter through-hole 18a properly, the large-diameter through-hole 18c is formed.
On the other hand, the screw member 20 and the hard sheet 14 are concentrically positioned with high accuracy. Further, the locking recess 20e is a portion with which a rotary tool for screwing the male screw portion 20a into the female screw 14a is engaged with the female screw 14a so as not to be relatively rotatable, and is, for example, a hexagonal hole or the like. The head portion 20b has a non-circular outer peripheral shape and can be used as a tool locking portion that is rotated by engaging a rotary tool on the outer periphery thereof. Since the gap is narrow, it cannot be used as a tool locking portion and is screwed using the locking recess 20e.

The root diameter of the female thread portion 20d is smaller than that of the mounting through hole 16b provided in the insert tip 16, and the male screw member 22 disposed through the mounting through hole 16b is screwed. It is supposed to be combined. The male screw member 22 includes a male screw portion 22a screwed into the female screw portion 20d and a head portion 22b having a diameter larger than that of the mounting through hole 16b.
And a locking recess 22c such as a hexagonal hole provided in the head 22b as a tool locking part are coaxially and integrally provided.
The male threaded portion 22a penetrates the mounting through hole 16b and is screwed into the female threaded portion 20d.
The head 22b is brought into contact with the upper edge of the above, that is, the peripheral edge of the opening on the side opposite to the hard sheet 14 to generate a fastening force, and the insert tip 16 is integrally fixed on the hard sheet 14 in a state of being in close contact therewith. The head portion 22b of the male screw member 22 is a countersunk head, and is accommodated in a dish-shaped (tapered) accommodation hole (counterbore hole) 16c provided in the opening peripheral edge portion of the attachment through hole 16b. The head 22b and the receiving hole 1
By the engagement with 6c, the insert tip 16 is positioned with high accuracy so that the mounting through hole 16b is concentric with the male screw member 22. The head portion 22b has a receiving hole 16c.
It is completely housed inside and does not project above the upper surface of the insert tip 16. The screw member 2
As for the length dimension of 0, the tip of the male screw part 20a is a hard sheet 1
It is set so that it does not protrude upward from the internal thread 14a of No. 4. Further, the male screw member 22 and the female screw portion 20
The screw d is opposite to the twisting direction of the screw of the male threaded portion 20a, and when the threaded member 22 is screwed to the female threaded portion 20d, the male threaded portion 20a is tightened to the female screw 14a. Rotational force is applied.

In such a chip mounting structure,
First, the male screw portion 20a of the screw member 20 is inserted into the large-diameter through hole 18a of the tool body 12, the rotary tool is engaged with the locking recess 20e, and the screw portion 20a is arranged on the chip mounting seat 18. The hard sheet 14 is integrally fixed on the chip mounting seat 18 by being screwed into the internal thread 14a of the hard sheet 14. After that, the insert tip 16 is arranged on the hard sheet 14, and the male thread portion 22a of the thread member 22 is inserted into the mounting through hole 16b provided in the insert tip 16 to form the screw member 2
Since it is provided at 0, by being screwed into the threaded portion 20d,
The insert tip 16 may be integrally fixed on the hard sheet 14.

According to the chip mounting structure of this embodiment, the male sheet portion 20a of the screw member 20 is screwed into the female screw 14a so that the hard sheet 14 is attached to the chip mounting seat 1
8 and the insert 20 is fixed to the hard sheet 14 by screwing the screw member 22 into the screw portion 20d provided at the tip of the screw member 20. The hard sheet 14 and the insert tip 16 are integrated into the tool body 12 easily and compactly with high positional accuracy without performing complicated processing such as the engaging portions 102a and 126a of FIG. Can be fixed permanently. In particular, in this embodiment, the screw member 20 is provided with the cylindrical portion 20c and is fitted into the large-diameter through hole 18a properly, and the head portion 22b of the male screw member 22 is a dish head inside the dish-shaped accommodation hole 16c. Since the hard sheet 14 and the insert tip 16 are fixed on the tip mounting seat 18 with higher positional accuracy, the hard seat 14 and the insert tip 16 are fixed to the tip mounting seat 18.

As described above, the multi-blade milling machine 10 of this embodiment is used.
Can easily and compactly fix a large number of insert tips 16 with high positional accuracy without performing complicated processing, which reduces the manufacturing cost of the tool, and insert chips 16 and hard sheets due to wear and damage. 1
It is possible to quickly perform the replacement work of 4 and the like. Further, the head portion 20b of the screw member 20 is brought into contact with the opening peripheral portion of the large-diameter through hole 18a, and the hard sheet 14 is integrally fixed to the tool body 12 by the fastening force of the screw. Strength and excellent durability are obtained, and there is little possibility that the screw member 20 will loosen due to chatter vibration during cutting, and high processing accuracy can be obtained.

Further, the head portion 20 of the screw member 20 of the present embodiment.
In b, a locking recess 20e is provided as a tool locking portion, and the outer peripheral shape of the head portion 20b itself is also non-circular so that it can be used as a tool locking portion. It is possible to perform the screwing operation with, and when the space between the head portion 20b and the tool body 12 is narrow as in the present embodiment, it is possible to suitably perform the screwing operation using the locking recess 20e.

In the multi-blade milling machine 10 as described in claim 12, the hard sheet 14 as the sheet member is the first member and the tool body 12 is the second member.
An embodiment in which the tool body is the first member and the hard sheet is the second member as in claim 11 will be described. The parts substantially common to the above-mentioned embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The tool body 32 of the multi-blade milling cutter 30 shown in FIG. 2 is provided with a tip mounting seat 34 similar to that of the above-mentioned embodiment, and through the screw member 36 and the male screw member 22,
A hard sheet 38 as a sheet member and the insert tip 16 are integrally fixed. The multi-blade milling machine 30 is an example of the cutting tool of claim 15, the tip mounting structure is an example of the screw fastening structure of claim 13, and the screw member 36 is the screw of claim 1, 2, 5, 8, 10, 11. It is an example of a member. The tool body 32 corresponds to the first member, and the tip mounting seat 34 is provided with a female screw 34a. The hard sheet 38 corresponds to the second member, has a rectangular plate shape, and has a large-diameter through hole 38a having a diameter larger than the root diameter of the female screw 34a in the central portion thereof. There is. Then, the hard sheet 38
The insert tip 16 is integrally fixed in a state where the large diameter through hole 38a and the attachment through hole 16b are positioned coaxially with the female screw 34a, and the posture around the axis thereof is the side wall 34b of the tip mounting seat 34. It is supposed to be positioned by.

The screw member 36 has a male screw portion 36a which is passed through the large diameter through hole 38a and is screwed into the female screw 34a.
A head portion 36b provided at an end portion of the male screw portion 36a opposite to the screwing direction, a columnar cylindrical portion 36c provided between the head portion 36b and the male screw portion 36a, and a head portion 36.
a locking recess 36d as a tool locking part provided in b,
The threaded portion 36e, which is provided on the bottom of the locking recess 36d, is coaxially and integrally provided. The head portion 36b has a larger diameter than the large diameter through hole 38a, and the male screw portion 36a has a female thread 3a.
By being screwed into 4a, it is brought into contact with the upper side of the large-diameter through hole 38a, that is, the peripheral edge of the opening on the side opposite to the chip mounting seat 34 to generate a fastening force, and the hard sheet 38 is mounted on the chip mounting seat 34. Integrally fixed in the state of close contact.
The head portion 36b is a countersunk head, and is accommodated in a dish-shaped (tapered) accommodation hole (counterbore hole) 38b provided in the opening peripheral edge portion of the large-diameter through hole 38a. By engaging the portion 36b and the accommodation hole 38b, the hard sheet 38 is positioned with high accuracy so that the large diameter through hole 38a is concentric with the screw member 36.

The cylindrical portion 36c has a diameter slightly larger than the outer diameter of the male screw portion 36a, and has substantially the same diameter dimension as the fitting hole portion 34c provided coaxially with the female screw 34a in the tip mounting seat 34 (strictly speaking, the diameter dimension thereof). The screw member 36 is screwed onto the chip mounting seat 34 with high positional accuracy by being fitted into the fitting hole 34c, and the positional accuracy of the hard sheet 38 with respect to the chip mounting seat 34 is high. Is even higher. The locking recess 36d has a male screw portion 36a and a female screw 34a.
A part to which a rotary tool for screwing into a is engaged so as not to be relatively rotatable, and is, for example, a hexagonal hole.

The root diameter of the threaded portion 36e, which is provided at the bottom of the locking recess 36d, is smaller than the mounting through hole 16b provided in the insert chip 16, and is disposed so as to penetrate the mounting through hole 16b. The male thread portion 22a of the male thread member 22 thus formed is screwed together, whereby the insert tip 16 is integrally fixed to the hard sheet 38 in a state of being in close contact therewith. Head 36 of screw member 36
b is completely accommodated in the accommodation hole 38b. Further, the threads of the male screw member 22 and the female screw portion 36e of this embodiment are the same as the screwing direction of the screw of the male screw portion 36a, and when the screw member 22 is screwed to the female screw portion 36e, the male screw portion Rotational force is applied to the female screw 34a in a direction in which the female screw 36a is tightened.

In such a chip mounting structure,
First, the hard sheet 38 is arranged on the chip mounting seat 34, and the external thread portion 36a of the screw member 36 is inserted into the large-diameter through hole 38a provided in the hard sheet 38,
A rotary tool is engaged with the locking recess 36d to secure the screw portion 36a.
Is mounted on the chip mounting seat 34, so that the hard sheet 38 can be mounted on the chip mounting seat 34 by screwing it into the screw 34a.
Fixed integrally on top. After that, the insert tip 16 is arranged on the hard sheet 38, and the external thread portion 22a of the screw member 22 is inserted into the mounting through hole 16b provided in the insert tip 16 to be provided on the screw member 36. Therefore, the insert tip 16 may be integrally fixed on the hard sheet 38 by being screwed into the screw portion 36e.

Also in the tip mounting structure of this embodiment, the same effect as that of the above embodiment can be obtained. Moreover, since the screw member 36 is screwed to the chip mounting seat 34 with high positional accuracy by fitting the cylindrical portion 36c and the fitting hole portion 34c, the hard sheet 38 and the insert chip 16 are inserted.
The positional accuracy of the above with respect to the chip mounting seat 34 is further improved. In addition, the locking recess 36d is formed in the head portion 36b of the screw member 36.
Is provided, and a female screw portion 36e is provided at the bottom of the locking recess 36d so that the male screw member 22 integrally fixing the insert tip 16 is screwed into the female screw portion 36e. Since the screw member 36 and the male screw member 22 are screwed in the same axial direction, that is, in the downward direction of FIG. 2, excellent workability can be obtained.

Although the embodiment of the present invention has been described in detail with reference to the drawings, this is merely an embodiment, and the present invention can be implemented in other modes, for example, FIG.
The screw member 40 shown in is also an example of the screw member of the present invention.
The screw member 40 is integrally provided with a male screw portion 40a, a head portion 40b, a cylindrical portion 40c, a female screw portion 40d, and a locking recess 40e coaxially, and the male screw portion 40a is a large portion of the second member. It penetrates the radial through hole and is screwed into the female screw of the first member. The head portion 40b is brought into contact with the peripheral edge portion of the opening of the large-diameter through hole by screwing the male screw portion 40a into the female screw, thereby integrally forming the first member and the second member. Although it is fixed to, the hexagonal head can also be used as a tool locking part. Cylindrical part 40c
Has a diameter substantially the same as that of the large-diameter through hole and is fitted into the large-diameter through-hole so as to position the second member, and is provided between the male screw portion 40a and the head portion 40b. The female screw portion 40d is integrally fixed to the first member and the second member by screwing a male screw member provided through the mounting through hole of the third member. It is intended to be installed, and is provided so as to penetrate in the axial direction with a root diameter smaller than that of the mounting through hole. Locking recess 40e
Corresponds to a tool locking portion, with which a rotary tool is engaged so as not to rotate relative to it.

Even with such a screw member 40, the same effect as that of the screw member 20 of FIG. 1 can be obtained. in addition,
Since the female screw portion 40d is provided so as to penetrate the screw member 40 in the axial direction, it is possible to screw a predetermined screw member also on the side of the head portion 40b. For example, the fourth member is integrally formed. It can be fixed.

Although not specifically exemplified, the present invention can be implemented in various modified and improved embodiments based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a tip mounting structure in an insert tip type multi-blade milling machine which is an embodiment of the present invention.

FIG. 2 is a sectional view illustrating another embodiment of the present invention.

FIG. 3 is a diagram illustrating another embodiment of the screw member of the present invention.

FIG. 4 is a partially cutaway front view showing an example of a conventional insert tip type multi-blade milling machine.

5 is a cross-sectional view showing a tip mounting structure in the multi-blade milling machine of FIG.

FIG. 6 is a cross-sectional view showing another example of a conventional tip mounting structure.

FIG. 7 is a cross-sectional view showing still another example of the conventional chip mounting structure.

FIG. 8 is a sectional view showing still another example of a conventional chip mounting structure.

[Explanation of symbols]

 10, 30: Multi-blade milling cutter (cutting tool) 12: Tool body (second member) 14: Hard sheet (sheet member, first member) 14a: Female thread 16: Insert tip (third member) 16b: Mounting through hole 18: Tip mounting seat 18a: Large diameter through hole 20, 36, 40: Screw member 20a, 36a, 40a: Male screw portion 20b, 40b: Head (tool locking portion) 36b: Head 20c, 40c: Cylindrical portion 20d, 36e, 40d: Female thread portion 20e, 36d, 40e: Locking concave portion (tool locking portion) 22: Male screw member 22a: Male screw portion 22b: Head 22c: Locking concave portion (tool locking portion) 32 : Tool main body (first member) 34: Tip mounting seat 34a: Female screw 38: Hard sheet (sheet member, second member) 38a: Large diameter through hole 38b: Storage hole

Claims (15)

[Claims] 1. A first member provided with a female screw and a second member provided with a large-diameter through hole having a diameter larger than a root diameter of the female screw are provided with the female screw and the large-diameter through hole. A screw member used for integrally fixing in a state of being positioned substantially coaxially, the male screw portion penetrating the large-diameter through hole and screwed into the female screw, and the male screw portion. By being screwed onto the female screw, the head portion is brought into contact with the opening peripheral edge portion of the large-diameter through hole to integrally fix the first member and the second member, and an axial direction. A female screw portion provided at an end portion of the screw thread into which a predetermined screw member is screwed, and a tool locking portion with which the rotary tool is engaged so as not to rotate relative to each other. A screw member to do. 2. A first member provided with a female screw, a second member provided with a large-diameter through hole having a diameter larger than a root diameter of the female screw, and a third member provided with a mounting through hole. Is a screw member used for integrally fixing the female screw, the large-diameter through hole, and the mounting through-hole in a state where they are positioned substantially coaxially, A male screw portion screwed to the female screw, and the male screw portion is screwed to the female screw to be brought into contact with the peripheral edge portion of the opening of the large-diameter through hole, and the first member and the The third member is connected to the first member and the third member by screwing a head part integrally fixing the second member and a male screw member penetrating through the mounting through hole. Since the two members are integrally fixed to each other, they are provided at the axial end portion with a root diameter smaller than that of the mounting through hole. A screw member, which has a tool locking portion with which the rotary tool is engaged so as to be relatively non-rotatable and is coaxially and integrally. 3. A cylindrical portion for positioning the second member by being fitted between the male screw portion and the head portion in the large-diameter through hole with a diameter dimension substantially the same as that of the large-diameter through hole. The screw member according to claim 1, wherein the screw member is provided. 4. The female screw portion is provided at an end portion on the male screw portion side, and the female screw is provided in a through hole in the first member. The screw member according to the item. 5. The screw member according to claim 1, wherein the female screw portion is provided at an end portion on the head side. 6. The internal thread portion is provided so as to penetrate axially from an end portion on the male screw portion side to an end portion on the head portion side. Screw member. 7. The head has a non-circular outer peripheral shape and also serves as the tool locking portion, and a rotating tool is engaged with the outer circumference of the head to be rotated. Item 1
The screw member according to any one of 1 to 6. 8. The screw according to claim 1, wherein the tool engaging portion is an engaging concave portion that is provided on an end face in the axial direction and is engaged with a rotating tool such that the rotating tool cannot rotate relative to the rotating tool. Element. 9. The head portion is provided at an end portion on the side opposite to the screwing direction of the male thread portion, the locking recess portion is provided in the head portion, and the head portion is not The screw member according to claim 8, which has a circular outer peripheral shape and can also be used as the tool locking portion. 10. The head portion is provided at an end portion on the opposite side to the screwing direction of the male screw portion, and the head portion is provided with a locking recess as the tool locking portion. ,
On the bottom of the locking recess is provided the female screw portion to which the male screw member for integrally fixing the third member is integrally fixed to the second member side, while the large screw portion is provided. The screw member according to claim 2 or 3, wherein an accommodation hole for accommodating the head portion is provided in an opening located on the opposite side of the radial through hole from the first member. 11. The first member is a tool body of a cutting tool, the second member is a seat member arranged on a tip mounting seat of the tool body, and the third member is arranged on the seat member. 2. An insert tip which is
8. The screw member according to 8 or 10. 12. The second member is a tool body of a cutting tool, the first member is a seat member arranged on a tip mounting seat of the tool body, and the third member is arranged on the sheet member. The threaded member according to any one of claims 2 to 4 and 6 to 9, wherein the threaded member is provided in a through hole in the sheet member. 13. A first member provided with a female screw, a second member provided with a large-diameter through hole having a diameter larger than the root diameter of the female screw, and a third member provided with a mounting through hole. Is a screw fastening structure in which the female screw, the large-diameter through hole, and the mounting through hole are integrally fixed in a state of being located substantially coaxially, and a male screw portion screwed to the female screw. , The threaded portion, which is provided at the end in the axial direction with a root diameter smaller than that of the mounting through hole, and the tool locking portion with which the rotary tool is engaged in a relatively non-rotatable manner, and the threaded portion is screwed together. A head portion having a diameter larger than that of the large-diameter through hole that generates force is coaxially provided integrally, and the male screw portion penetrates the large-diameter through hole and is screwed into the female screw, and The first member and the second member are brought into contact with each other by bringing the head into contact with the peripheral edge of the opening of the large-diameter through hole.
A screw member integrally fixed to the member, a male screw portion screwed to the female screw portion of the screw member, a head having a diameter larger than the mounting through hole, and provided on the head side. And a tool locking portion with which the rotary tool is engaged so as not to rotate relative to each other, are integrally provided on the same axis, and the male screw portion penetrates the mounting through hole and is screwed into the female screw portion, And a male screw member for integrally fixing the third member to the first member and the second member by bringing the head into contact with the opening peripheral portion of the mounting through hole. And screw fastening structure. 14. The second member is fitted between the male screw portion of the screw member and the head portion by being fitted in the large-diameter through hole with a diameter dimension substantially the same as that of the large-diameter through hole. The screw fastening structure according to claim 13, wherein a cylindrical portion for positioning is provided. 15. The screw member according to claim 11, a male screw portion screwed into the female screw portion of the screw member, a head having a diameter larger than the mounting through hole, and the head side. Is integrally provided coaxially with a tool locking portion that is engaged with the rotary tool such that the rotary tool cannot rotate relative to the male screw portion, and the male screw portion penetrates the mounting through hole and is screwed to the female screw portion. At the same time, by using the male screw member that integrally fixes the insert tip to the tool body and the sheet member by bringing the head portion into contact with the opening peripheral portion of the attachment through hole,
A cutting tool, wherein the sheet member and the insert tip are integrally fixed to the tool body.