JP2003311512A - Tool holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool holder particularly effective for a tool for machining multistart screws, wherein rigidity of the tool is maintained by adjusting an angle equivalent to a side clearance angle of the tool with a tool holder, and fracture is prevented. <P>SOLUTION: The tool holder 20 comprises a support 21 and a mount 22. The tool 23 (a throwaway tip) is mounted to the mount 22, and these are mounted all together to a tool post 1 and held. The mount 22 is rotatable against the support 21, and a clearance equivalent to the side clearance angle ϕis obtained by rotating the mount 22 instead of taking the side clearance angle ϕ of the tool 23. Thus, impairment of the rigidity of the tool 23 is avoided. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder used for mounting a tool on a lathe.

[0002]

2. Description of the Related Art FIG. 1 is a front sectional view showing an outline of a conventional lathe. In FIG. 1, 1 is a tool post, 2 is a chuck, and as is well known,
The workpiece 3 held at the center of the lathe spindle of the tool rest 1 is cut by the cutting tool 4 held by the chuck 2. In the figure, 5 is a floor plate, 6 is a bite set screw, 7 is a turret reference surface, 8 is the center of a lathe spindle, 9 is a lathe chuck, and h is the height of the lathe spindle center 8 from the turret reference surface 7.

FIG. 2 is a trihedral view (a plan view (A), a side view (B) and a front view (C)) of a conventional round tool chuck. In the figure, 10 is a round bite, 11 is a cutting edge for screw machining, 12 is a bite holder, and 13 is a round bite set screw.

FIG. 3 is an explanatory view (A) of the lead angle and the twist angle of the double thread and an explanatory diagram (B) of the lead angle and the twist angle in the thread processing. In FIG. 3, p is the pitch, L is the lead, d is the outer diameter of the screw, α is the twist angle, β is the lead angle,
0 is the starting point of the lead angle β, and X is 2πd / 2, which is the distance that the lead L moves in the axial direction when the screw is rotated once, while on the circumferential surface when the screw is rotated once. It corresponds to the actual travel distance.

FIG. 4 is an explanatory view of a corner angle of a bite.
(A) is a perspective view of a thread cutting tool, (B) is a plan view,
(C) is an enlarged side view showing the rake angle θ and the front clearance angle δ,
(D) is an enlarged perspective view from the front left side showing the lateral clearance angle φ,
(E) is an enlarged perspective view from the front right side showing an angle ψ obtained by adding a twist angle to a side clearance angle. B, C in the figure (A),
D and E indicate the line-of-sight directions in FIGS. It is well known that the rake angle θ and the clearance angle greatly affect the performance of the cutting tool as a tool. For example, if the side clearance angle of the cutting tool is set to be large, there arises a problem that the cutting tool is easily damaged due to a decrease in the strength of the cutting edge.

In such a lathe, the simple and easy exchange of the bite, that is, the reduction of the bite exchange time leads to the reduction of the man-hour and the cost reduction, so that it has always been a problem. Instead, it has been desired that the tip of the cutting tool can be located at the center of the workpiece (main spindle of the lathe) simply by setting the cutting tool holder.

The present invention has been made in view of such conventional problems, and the angle corresponding to the side clearance angle of the cutting tool is adjusted by a cutting tool holder to maintain the rigidity of the cutting tool.
An object of the present invention is to provide a bite holder which prevents damage and is particularly effective for a multi-threaded threading tool having a large lead angle in a thread cutting process by a lathe.

[0008]

In order to achieve the above object, a bite holder according to claim 1 of the present invention is a bite holder consisting of an attachment tool and a support base for the cutting tool, and the attachment tool is the above-mentioned. It comprises a tool mounting part for fixing a tool and a mounting part for the supporting base, and has a fixing part for fixing to a tool rest of a lathe at one end of the supporting base, and a mounting part for the fixture at the other end of the supporting base. The mounting fixture mounting portion is capable of rotatably mounting the mounting fixture, and includes the support base and the mounting fixture.
The fixing member is inserted through a hole provided in the support base and inserted into an annular recess or a plurality of recesses provided on the outer peripheral surface of the attachment so that the fixing member can be fixed at an appropriate rotational position. .

According to the second aspect of the present invention, in order to achieve the above object, in the bite holder of the first aspect, when the fixing portion of the support base and the attachment attachment portion are attached to the attachment fixture. The positional relationship is such that the tip of the cutting edge of the cutting tool mounted on the fixture is aligned with the center of the rotary spindle of the lathe.

According to a third aspect of the present invention, in order to achieve the above object, in the bite holder according to the first or second aspect, the recesses of the fixture are arranged at predetermined angular intervals into which the fixing member can be inserted. The hole of the support base is provided at a slight angle with respect to the hole of the attachment tool, and the attachment tool can be fixed to the support base at a predetermined angle.

According to a fourth aspect of the present invention, in order to achieve the above object, in the bite holder of the third aspect, the angular interval of the holes of the support base is slightly wider than the angular interval of the holes on the fixture side. The angle difference enables the angle of the cutting tool mounted on the fixture to be adjusted with respect to the center of the rotation spindle of the board.

According to a fifth aspect of the present invention, in order to achieve the above object, in the bite holder according to any one of the first to fourth aspects, one of the support base and the fixture is provided with an angle display scale and the other is provided. It is characterized in that an instruction mark is provided.

According to a sixth aspect of the present invention, in order to achieve the above object, in the bite holder according to any one of the first to fourth aspects, a main scale angle display scale is installed on one of the support base and the attachment. However, it is characterized in that a vernier scale angle display scale is provided on the other side.

According to a seventh aspect of the present invention, in order to achieve the above object, in the bite holder according to any one of the first to sixth aspects, the bite to be attached to the fixture is a throwaway tip, and the tip of the tip is It is characterized in that the above-mentioned fixture is provided for each shape.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. It should be noted that, in the following, the same parts as those in the prior art will be denoted by the same reference numerals, and overlapping description will be omitted. FIG. 5 is a front sectional view (A) corresponding to FIG. 1 of a lathe using the first embodiment of the bite holder according to the present invention, and FIG.
It is a top view (A), a side sectional view (B), a front partial view (C), and a perspective view and a plan view (D) of a commercially available thread cutting tool according to the present embodiment. The bite holder 20 of the present embodiment includes a support base 21 and a fixture 22, and a bite (throwaway tip) 23 is attached to the fixture 22 and is attached to and held by the tool rest 1 as a whole. Further, in the figure, reference numeral 24 is a tool fixing bracket, 25 is a tool fixing screw, and 26 is a fixture fixing screw.

The support base 21 has a mounting recess 27 for mounting the mounting tool 22 at its tip, and the mounting tool 22 also has a tool mounting portion 28 for mounting the tool 23 at its tip.
And has a fixture fixing screw 26 at a substantially central portion of the base.
Annular recess 29 for inserting and positioning the tip of the
Has been formed. In the figure, 30 is a fixture fixing screw 26.
Female screw hole provided on the fixture 22 for inserting the
Is a bite positioning pin. Furthermore, in the figure, c is the fixture 2.
2 axis center, 11 is turret reference plane 7 to lathe spindle center 8
Is a distance from the support base reference surface to the center axis of the lathe spindle.

In the present embodiment, the bite holder 20 including the fixture 22 of the bite 23 and the support base 21 can fix the bite 23 to the fixture 22 constantly, and therefore, even if the bite 23 is replaced, it is always constant. Can be held in position (height). It is easy to exchange the bite 23. That is, the tool 23 can be exchanged by simply exchanging the tool 22 with the tool 23 fixedly fixed, or with the tool 2 fixed to the tool 22.
3 should be exchanged.

Since there is a fixed position (height) relationship between the tool rest 1 of the lathe and the center 8 of the rotary spindle and the chuck 2, the tip end height of the cutting tool 23 of the tool holder 20 fixed to the tool rest 1 is set to the rotary spindle. With the configuration in which it coincides with the center 8, the height adjustment of the cutting tool 23 can be eliminated when the cutting tool 23 is exchanged.

The mounting tool 22 is rotatable with respect to the support base 21. Therefore, by rotating the mounting tool 22 with the cutting tool 23 fixed, the cutting tool 23 is rotated.
Since it is possible to obtain a clearance corresponding to the lateral clearance angle φ without taking the lateral clearance angle φ, it is possible to avoid impairing the rigidity of the cutting tool 23 by setting the lateral clearance angle φ in the cutting tool 23. That is, when the side clearance angle φ of the cutting tool 23 influences cutting, the cutting of the side clearance angle φ of the cutting tool 23 reduces the thickness of the cutting tool 23, reduces the rigidity, and is easily damaged. The tool 2 is attached to the support base 21 without taking the side clearance angle of the cutting tool 23.
2 is rotated to obtain the same cutting effect as when the side clearance angle of the cutting tool 23 is taken.

FIG. 7 is a plan view (A), a side view (B), a front view (C), and a perspective view and a plan view of a cutting tool, which is used in a commercially available cutting tool (for throwway tip, groove). It is a side view (D). The fixture 22 of this example is configured to fix the bite 23a (for the throwaway tip, for the groove) to the bite mounting portion 28 via the spacer 32. In the figure, reference numeral 33 is a screw for fixing the cutting tool. See also FIG.
[Fig. 3] is a plan view (A) and a side view (B) showing an example in the case of being used for a commercially available bite (for throw way tip, for screw). The fixture 22 of this example is configured such that the bite 23b (for throwaway tip, for screw) is directly fixed to the bite mounting portion 28 with a fixing screw 34. These examples are
The fixture 22 is standardized according to the shape of the throwaway tip, so that other types of throwaway tips, that is, bites of different shapes can be easily replaced.

FIG. 9 is a side cross-sectional view (A), a front partial view (B) and a front cross-sectional view (C) taken along line XX in (A) of the second embodiment of the bite holder according to the present invention. Is. The mounting tool 22 of the present embodiment is also rotatable with respect to the support base 21, but the turning angle can be set at an arbitrary or predetermined angle. That is, a plurality of fixing positioning holes 35 (corresponding to the female screw holes 30 of the first embodiment) of the support base 21 are provided in advance, while a plurality of holes 37 ... Are provided in the annular recess 29 of the fixture 22. A female screw hole 38 is formed in the bottom of the hole 37, and a male screw 39 provided at the tip of the fixing pin 36 is screwed in for positioning. The positioning hole 35, the fixture 22 and the hole 37 of the support base are female screw holes 38.
It is a larger hole with the same diameter.

In the illustrated example, the upper portion of the fixture 22 is set to 0.
The holes 37 are provided at symmetrical positions of 45 ° on the left and right sides of the figure.
On the other hand, positioning holes 3 for indexing the support base 21 are provided.
Set 5 to 0 ° on the upper side and open 3 places on the left and 46 ° on the right side of the figure.
By fixing the fixing pin 36 to the left side 46 ° of the support base 21, the fixture 22 to which the cutting tool 23 is fixed can be easily set to the inclination of 1 ° in the clockwise direction in the figure. Similarly, on the right side of the support base, the fixture 22 can be easily fixed by setting an inclination of 1 ° in the counterclockwise direction. Of course, the above-mentioned setting of the angle difference can be changed, and the fixture 22
Can be rotated at any angle. The fixture 22 will be tilted corresponding to this shift angle, and it will be easy to obtain the relief corresponding to it in a plurality of forms without taking the lateral clearance angle φ of the cutting tool 23. The bite 23 can be tilted with good reproducibility without depending on.

10 to 12 are front views of third to fifth embodiments of the bite holder according to the present invention. In the embodiment of FIG. 10, the instruction mark 40 is provided on the front end surface of the support base 21, and the main scale angle scale 41 is provided on the front end surface of the fixture 22, and in the embodiment of FIG. The scale angle scale 42 and the angle display value 43 are provided, and the instruction mark 44 is provided on the front end face of the fixture 22, and in the embodiment of FIG. 12, the main scale angle scale 42 and the angle display value 43 are provided on the front end face of the support base 21. Is provided, and a vernier scale angle scale 45 is provided on the front end surface of the mounting tool 22 so that the angle adjustment of the cutting tool 23 can be visually confirmed.

[0024]

Since the tool holder according to claim 1 is as described above, it is possible to securely and easily fix the fixture and the support at a fixed position, and it is possible to easily replace the tool in lathe machining. This has the effect of facilitating the work and reducing the time required for exchanging the tool to reduce the man-hours and the costs.

In addition to the above-mentioned common effects, the bite holder according to a second aspect of the present invention is such that the tip of the bite is the center of the rotary spindle of the lathe,
That is, there is an effect that the tool can be aimed only by setting the tool holder at the center of the workpiece.

According to the bite holder of the third aspect, in addition to the common effects described above, the holes for fixing and positioning the fixture and the support base are preliminarily displaced to facilitate the inclination of the fixture corresponding to the displaced angle. There is an effect that can be obtained.

In addition to the common effects described above, the bite holder according to a fourth aspect of the invention has a slightly wider angular interval between the holes on the support base than the angular interval between the holes on the mounting tool side, and is mounted on the mounting tool by this angular difference. By changing the inclination of the cutting tool, the rigidity of the cutting tool can be maintained without taking the side clearance angle, and it is possible to prevent the cutting tool from being damaged, and it is especially effective for the cutting thread with a large lead angle in the thread cutting process with a lathe. Has the effect of becoming.

In addition to the above-mentioned common effects, the bite holders according to claims 5 and 6 have a tilt angle of the fixture when the angle corresponding to the side relief angle of the bite is obtained by tilting the fixture. There is an effect that the standard can be easily obtained.

In the bite holder according to the seventh aspect, in addition to the common effects described above, by standardizing the mounting tool by the shape of the throwaway tip, various bites can be used easily and easily in exchange. There is an effect.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an outline of a conventional lathe.

FIG. 2 is a trihedral view (plan view (A), side view (B), and front view (C)) of a conventional chuck for a round bite.

FIG. 3 is an explanatory diagram of the lead angle and the twist angle of the double thread screw (A).
FIG. 4B is an explanatory diagram (B) of a lead angle and a twist angle in screw processing.

4A and 4B are explanatory views of a corner angle of a cutting tool, FIG. 4A is a perspective view of a threaded cutting tool, FIG. 4B is a plan view, and FIG. 4C is an enlarged side view showing a rake angle θ and a front clearance angle δ; (D) is an enlarged perspective view from the front left side showing the lateral clearance angle φ, and (E) is an enlarged perspective view from the front right side showing the angle ψ obtained by adding the twist angle to the lateral clearance angle.

FIG. 5 is a front sectional view (A) corresponding to FIG. 1 of a lathe using the first embodiment of the bite holder according to the present invention.

FIG. 6 is a plan view (A), a side sectional view (B), a front partial view (C), and a perspective view and a plan view (D) of a commercially available thread cutting tool according to the present embodiment.

FIG. 7 is a plan view (A), a side view (B), a front view (C) and a perspective view, a plan view and a side view of a bite used in a commercially available bite (for throw way tip and groove). (D).

[Fig. 8] Commercially available bite (for slow-way tip and screw)
Plan view (A) and side view (B) showing an example when used for
Is.

FIG. 9 is a side sectional view (A), a front partial view (B) and (A) of the second embodiment of the bite holder according to the present invention.
-FIG. 6 is a front cross-sectional view (C) taken along the X-ray.

FIG. 10 is a front view of a third embodiment of a bite holder according to the present invention.

FIG. 11 is a front view of a cutting tool holder according to a fourth embodiment of the present invention.

FIG. 12 is a front view (A) and a partially enlarged front view (B) of a fifth embodiment of a bite holder according to the present invention.

[Explanation of symbols]

1 Turret 2 chuck 20 bit holder 21 Support 22 Fixture 23 bytes (throw away tip) 23a byte (for throwaway tip, groove) 23b bytes (for throwaway tip, screw) 24-byte fixing bracket 25-byte fixing bracket fixing screw 26 Fixing screw 27 Mounting recess 28-byte mounting part 29 annular recess 30, 38 Female hole 31-byte positioning pin 32 spacer 33 bytes fixing screw 34 fixing screw 35 Fixing positioning hole 37 holes 39 Male thread at the end of the fixing pin 40, 44 instruction mark 41, 42 Main scale angle scale 43 Angle display value 45 vernier angle scale

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masatoshi Saito             1-3-3 Nakamagome, Ota-ku, Tokyo Stocks             Company Ricoh F-term (reference) 3C046 KK01 KK11

Claims (7)

[Claims] 1. A tool holder comprising a tool mounting tool and a support table, wherein the tool tool comprises a tool mounting section for fixing the tool and a mounting section to the supporting table, and one end of the supporting table. Is equipped with a fixing part that is fixed to the tool post of the lathe,
The other end of the support base is provided with a mounting portion for the mounting fixture, the mounting fixture mounting portion allows the mounting fixture to be rotatably mounted, and the supporting base and the mounting fixture are provided in the supporting base. A tool holder that can be fixed at an appropriate rotational position by inserting a fixing member from the above and inserting it into an annular recess or a plurality of recesses provided on the outer peripheral surface of the fixture. 2. The bite holder according to claim 1, wherein when the fixing portion of the support base and the attachment attachment portion are attached to the attachment fixture, the blade tip of the bite attached to the attachment fixture is the lathe. A bite holder having a positional relationship that matches the center of the rotation main axis. 3. The bite holder according to claim 1 or 2, wherein the recesses of the fixture are holes arranged at a predetermined angular interval into which the fixing member can be inserted, and the holes of the support base are provided in the fixture. The tool holder is characterized in that it is provided at a slight angle with respect to the hole to enable the attachment to be fixed to the support base at a predetermined angle. 4. The tool holder according to claim 3, wherein the angular intervals of the holes of the support base are slightly wider than the angular intervals of the holes on the side of the fixture, and the board of the bite mounted on the fixture due to this angular difference. The tool holder is characterized in that the angle with respect to the center of the rotation main axis can be adjusted. 5. The bite holder according to any one of claims 1 to 4, wherein one of the support base and the attachment is provided with an angle display scale and the other is provided with an instruction mark. 6. The bite holder according to any one of claims 1 to 4, wherein a main scale angle display scale is provided on one of the support base and the attachment, and a vernier scale angle display scale is provided on the other. Characteristic bite holder. 7. The bite holder according to claim 1, wherein the bite to be attached to the fixture is a throwaway tip, and the fixture is provided for each shape of the tip. .