JPH0344413Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The disclosed technology is applied to the technical field of the structure of a tightening and fixing part for attaching a throw-away tip processing tool to a face milling cutter that performs flat cutting on metal products. belong to

<Summary> Therefore, this invention fixes a throw-away tip to the tool body of a face milling cutter for flat cutting of metal products via a presser foot, by pressing the presser foot into the mounting groove of the tool body. The tightening screw for fixing the presser foot has a smooth head with no threads on the circumference and has a spanner hole formed therein, and the presser foot can be set by sliding into a T-shaped slot-shaped tightening groove provided in the tool body. This invention relates to a screw structure for tightening the presser foot of a face milling cutter, in which the screw shank of the set screw has a head and a male thread is engraved on the tip thereof, and in particular,
The thread shank has a relatively small diameter, while the male thread has a large diameter and is formed to have the same diameter as the smooth head, so that the thickness of the head is close to the depth of the T-shaped slot-like tightening groove. This invention relates to the presser foot tightening screw structure of the face milling cutter.

<Prior Art> As is well known, many metal products have planar cutting surfaces, and so-called face mills are widely used to perform such planar cutting.

Therefore, a prescribed throw-away tip is often used on the mounting surface of the tool body.

This structure will be schematically explained in Fig. 1.
A locator 5 equipped with a throw-away tip 4 is set on a plurality of tip seats 3 formed at predetermined positions in the circumferential direction of the mounting surface 2 of the tool body 1 of the face milling cutter, and a groove bottom 6 and an inclined surface located on the side of the tip seat 3 are set. The presser foot 9 is inserted into the mounting groove 8 in which the support surface 10 is brought into contact with the inclined surface 7, and the presser foot 9 is brought into contact with the throw-away tip 4, and the tightening screw 12 is tightened. Screw it into the female thread of the tool body 1 and push it forward, and insert the throwaway tip 4 into the tool body 1.
It was designed to be fastened and fixed to the

Such technology, for example,
It is also disclosed in the patent publication.

As shown in FIGS. 2 and 3, the combination structure of the presser foot 9 and the tightening screw 12 set thereon is as shown in FIGS. The tightening screw 12 is formed with a screw shank 14 having a smooth circumferential surface with a diameter d so that the tightening screw 12 can enter and exit the T-shaped slot-like tightening groove 13 from the right side in the figure. has an integrally formed head 15 with a smooth circumferential surface and no thread formed thereon, having a spanner hole (not shown) in its upper part;
A male thread 16 having the same diameter d as the diameter d of the thread shank 14 is formed on the upper and lower sides of the figure.

Reference numeral 17 denotes a spanner insertion hole into which a spanner (not shown) is loosely inserted and engaged with a spanner hole (not shown) of the head 15 to apply torque and rotate the tightening screw 12.

The thickness of the head 15 of the tightening screw 12 is made thinner by l than the depth of the T-shaped slot-shaped tightening groove 13 into which the head 15 is loosely inserted, as shown in the figure. Tightening screw 1 for groove 13
It is designed to make it easy to put in and take out items.

<Problem to be solved by the invention> However, the presser foot 9 and the tightening screw 1 of the above structure
In the combination structure No. 2, first, since the screw shank 14 and the male screw 16 are formed to have approximately the same diameter d, a wrench (not shown) is inserted through the wrench loose insertion hole 17 of the presser foot 9 to tighten the tightening screw 12. Head 15
Engage it with a spanner hole (not shown), rotate it by applying torque, screw it into the female screw (not shown) of the tool body 1, rotate it forward and backward, and tighten it with the presser foot 9 to fix the throw-away tip 4. In this case, the male thread 16 of the tightening screw 12 must be loosened.
Since the diameter d of is the same as that of the screw shank 14,
The amount of rotation of the screw thread in the circumferential direction is small, and therefore the amount of advance of the pitch in the vertical direction is small, resulting in a disadvantage that the operability of tightening the presser foot 9 is poor.

Also, as mentioned above, the head 15 of the tightening screw 12 and the T
As shown in FIG. 3, the thickness of the mold slot-shaped clamping groove 13 relative to the head 15 is smaller by l than the depth of the T-shaped slot-shaped clamping groove 13, so the clamping position relative to the presser foot 9 is As shown in Fig. 2, the tightening screw 12 is lowered relative to the presser foot 9 by that amount, and when loosened for replacement, it is reversed as shown in Fig. 3. In this case, the tightening screw 12 is located at a higher position relative to the groove bottom, which has the drawback that there is a play of 1, and the effective operability of advancing and retracting the screw is poor. Even when tightened due to severe impact during plane cutting,
There was also a problem that play caused by the amount of play.

To deal with this, for example,
In the tightening screw structure for fixing the throw-away tip to a face milling tool, which is proposed in the No. 1 publication, etc., as shown in Fig. 5, the diameter of the male screw is the same as the diameter of the head part, Moreover, a technique is disclosed in which the screw shank portion between the two has a small diameter.

However, this kind of tightening screw is a so-called double screw type, and the screw provided in the head part is a reverse thread, and by rotating the tightening screw, the presser foot is pushed through the head part and attached to the tool body. The negative point is that the throwaway tip cannot be securely fixed and tightened.
Further, in such prior art, it is necessary to store the tightening screw, particularly the head, in a narrow space of the presser foot, and the screw is carved into the head.

With this type, it is difficult to taper,
Further, the connection with the set groove is difficult, and therefore, there is the inconvenience that play between the head and the presser foot cannot be provided when the tightening screw is rotated in the normal or reverse direction.

<Purpose of the invention> The purpose of this invention is to solve the technical problem of the combination structure of the presser foot and the tightening screw for the tool body for attaching and fixing the throw-away tip of the tool body in the face milling cutter based on the above-mentioned conventional technology. This ensures smooth operation when tightening screws with a wrench, as well as ensuring that the tightening screw fits well with the presser foot of limited size, and that setting and resetting are easy. It is an object of the present invention to provide an excellent clamping screw structure for a presser foot of a face milling cutter that is beneficial to the field of application of cutting technology in the metal product manufacturing industry by ensuring that no backlash or play during operation occurs.

<Means/effects for solving the problem> In order to solve the above-mentioned problems, the configuration of this invention, which is based on the above-mentioned claims for utility model registration, is to perform flat cutting of metal products using a throw-away chip. When carrying out milling with a face milling cutter, the throw-away chip is set via a locator onto the chip seat formed at a predetermined position on the mounting surface of the tool body of the face mill, and at the same time, the Set the presser foot with the tightening screw inserted into the mounting groove, screw the tightening screw into the female thread of the tool body, and insert the spanner through the spanner insertion hole of the presser foot to open the head of the tightening screw. The support surface of the presser foot is engaged with the inclined surface of the mounting groove by engaging the wrench hole, and the presser foot is brought into contact with the throw-away tip and the throw-away tip is pushed into the tool body by a wedge action. When setting the clamping screw to the presser foot, insert the clamping screw into the T-shaped slot-shaped clamping groove formed in advance from the side of the clamping screw. Insert the small-diameter screw shank of the attached screw and the smooth, unthreaded head on the larger-diameter circumferential surface of the screw shank into a narrow space, and use a wrench to fit it into the wrench hole of the head. Tightening and fixing the presser foot to the tool body by rotating through engagement;
and dissociation, and in this process,
The male screw integrally formed at the tip of the screw shank has the same diameter as the head and has a predetermined diameter larger than the narrow diameter of the screw shank to increase the amount of rotation of the thread of the male screw. The amount of advance and retreat for one pitch is increased, so tightening and
The amount of operation required for release is small, and the thickness of the head in the T-shaped slot-shaped clamping groove of the presser foot is extremely small compared to the depth of the corresponding T-shaped slot-shaped clamping groove of the head. The thickness is similar and the strength is increased, and the durability is increased so that it will not be damaged even if the torque applied by the wrench is large. In addition, technical measures have been taken to prevent looseness between the tightening screw and the presser foot due to the impact caused by the throw-away tip when cutting a flat surface.

<Example> Next, an example of this invention will be described below based on FIGS. 4 and 5. In addition, 1st to 3rd
Components having the same features as those in the drawings will be described using the same reference numerals.

The presser foot 9 has substantially the same structure as the conventional structure shown in FIGS. 1, 2, and 3, and is attached to each tip seat 3 formed at a plurality of predetermined positions in the circumferential direction of the mounting surface 2 of the tool body 1 of the face milling cutter. Against throwaway chip 4
A locator 5 equipped with a locator 5 is attached via a presser foot 9 set in a mounting groove 8 having a sloped surface 7 and a groove bottom 6 formed on the side of the chip seat 3 in the tool body 1. By means of a wedge action, the throw-away tip 4 is smoothly tightened and fixed to the tool body 1, and loosened and released.

A T-shaped slot-shaped tightening groove 13 is formed from the side from the right side of the presser foot 9 to the center of the presser foot 9 in the drawing. A hole 17 is bored and communicated.

Reference numeral 12' denotes a tightening screw, which is combined with a presser foot 9 whose one side is tapered downward, and the presser foot 9 is installed in the mounting groove 8 of the tool body 1 of the face milling cutter as described above, and the screw is inserted into the screw. The away tip 4 is tightened and fixed, loosened and released for replacement, and the screw shank 14 has a spanner hole in the upper part, and the head 1 has no screws carved on the circumference and is made smooth.
5 is integrally formed with a male screw 16' at the tip.
are also integrally formed, and screw shank 1
4 and the head 15 are loosely inserted into the T-shaped slot-shaped tightening groove 13 so that they can be freely inserted and removed.

The screw shank 14 and its head 15 have the same relative sizes as in the conventional configuration shown in FIGS. 1, 2, and 3, and the diameter of the screw shank 14 between them is d, and that of the head 15 is D. (D>d), therefore, the size of the T-shaped slot-like tightening groove 13 is the same as in the conventional embodiment.

Further, as shown in FIG. 4, the height of the head 15 is extremely slightly thicker than the depth of the corresponding T-shaped slot-shaped tightening groove 13, and there is a minute clearance Δl between the two. For example, the thickness is such that a significantly small clearance such as 0.2 mm is formed, and the corresponding gap l in the conventional embodiment is
The gap is much smaller than (l>Δl).

Further, the male thread 16' integrally formed at the tip of the threaded shank 14 has a diameter D, which is the same as that of the head 15, and is the same as that of the conventional threaded shank 14 as shown in FIGS. It is significantly larger than the diameter d (D>d), and therefore,
A small diameter thread shank 14 having a step and a neck shape is formed between the head 15 and the male thread 16'.

Also, the pitch of the male thread 16' is large, for example,
The diameter is 1.25 mm, which is much larger than the 0.8 mm of the conventional embodiment shown in FIGS.

Therefore, by half a turn of the tightening screw 12', the amount of advance of one pitch of the male thread 16' is 0.625 mm, which is 1.55 times larger than the 0.4 mm in the conventional system.
Therefore, the amount of operation required for tightening and releasing is large.
Therefore, work efficiency is greatly improved.

In the above structure, when tightening the throw-away tip set in the tool body 1 with the presser foot 9 as described above, or releasing and replacing it, the T-shaped slot-shaped tightening groove 13 of the presser foot 9 is inserted into the presser foot 9. Tightening screw 1
2' screw shank 14 and head 15 are inserted from the right side in the figure (the head 15 has no screws on its circumferential surface and is smooth, so it can be inserted smoothly even in a narrow space. ),
Place the male screw 16' so that it faces the female screw 18 formed in the groove bottom 6 of the mounting groove 8 of the tool body 1, and press the presser foot 9.
Loosely insert a spanner (not shown) into the spanner insertion hole 17 at the top of the tightening screw 12', engage the spanner hole (not shown) in the head 15 of the tightening screw 12', apply torque and rotate, and screw the male thread 16' into the female thread 18. , or
I'm going to screw it back.

At this time, as mentioned above, the upper and lower clearance of the head 15 of the tightening screw 12' with respect to the corresponding T-shaped slot-shaped tightening groove 13 is only an extremely small amount Δl. The amount of screw movement immediately affects the amount of movement of the presser foot 9, and the presser foot 9 is smoothly tightened and released from the mounting groove 8.

In this case, the thickness of the head 15 can be designed to be large, and the strength of the head 15 can be increased accordingly.
The rigidity can be increased, and the strength and rigidity are increased because the diameter D of the head 15 is larger than the diameter d of the screw shank 14. Together with this, the torque of the wrench can be increased, and reliable tightening and disassembly can be performed.

Furthermore, since the diameter D of the male thread 16' of the tightening screw 12' is the same as the diameter D of the head 15, the amount of rotation of the thread is large, and therefore the amount of screw insertion for one pitch is large. The amount of screw retraction is also large, so presser foot 9
The amount of penetration and retraction is also large, and the workability increases smoothly and the operability is good.

Therefore, the throw-away tip 4 can be tightened smoothly and accurately.

Even when an impact load is applied during plane cutting, the T-shaped slot-shaped clamping groove 13 of the presser foot 9 and the head 15 of the clamping screw 12' are engaged through an extremely small gap Δl. Therefore, no backlash occurs, and the durability of both the tightening screw 12' and the presser foot 9 is improved.

Therefore, even in the process of releasing the presser foot 9 by the reverse operation to the above-mentioned operation when the throw-away tip 4 is worn out and needs to be replaced, the above-mentioned minute clearance Δl is maintained when the tightening screw 12' is reversely rotated with a wrench. As a result, the reverse rotation of the tightening screw 12' causes the presser foot 9 to loosen and release immediately.
Further, when the tightening screw 12' is raised by reverse rotation, the disassociation is performed extremely smoothly due to the large diameter and large pitch of the male thread 16'.

It goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments; for example, the T-shaped slot-like tightening groove may be provided with a tapered portion in the depth direction and in the vertical direction. The following aspects can be adopted.

<Effects of the invention> According to this invention, basically, in a face milling cutter that performs surface cutting in the production of metal products, the tool body of the presser foot that fixes and releases the throw-away tip that is set in the tool body. In the structure of the tightening screw that tightens and releases the formed mounting groove, the presser foot is tightened and fixed to the throw-away tip by inserting a wrench through the spanner insertion hole of the presser foot and rotating the tightening screw.
It also has the effect of dissociating, and
The operation is smooth, and there is little play between the tightening screw and the presser foot, which prevents wear during use, improving durability, and its easy operation means that the tightening screw can be rotated easily. This has the effect of being immediately connected to the tightening and releasing operation of the presser foot.

By making the diameters of the heads and male screws provided above and below the small-diameter screw shank larger than that of the screw shank, with a large-diameter male screw, when the presser foot is tightened and unfastened, when the tightening screw is rotated with the wrench, the male screw is The amount of rotation of the screw thread is large, therefore,
The forward and backward movement of the tightening screw by one pitch is made larger than the positional rotation of the conventional tightening screw, which has the excellent effect of greatly improving its operability.

In addition, by making the diameter of the head larger than the diameter of the screw shank, when the wrench is engaged with the wrench hole provided in the head, even if the tightening torque and disassembly torque are increased, the strength of the head is increased and it will not cause a loose hole. The effect is that no sagging occurs, the durability is good, and the function can be maintained sufficiently.

Furthermore, by making the thickness of the head similar to the depth of the corresponding T-slot-shaped tightening groove and designing it so that there is an extremely small gap between the two, the movement of the tightening screw during operation is immediately suppressed. It has the effect of making it easier to tighten and release as the metal moves forward and backward, and has good operability.The impact during plane cutting is not transmitted to a large extent, gas is not generated, and the durability of not only the presser foot but also the tightening screw is improved. This not only has the excellent effect of improving the properties of the head, but also increases the strength of the head, thereby promoting the above-mentioned merits of the large diameter of the head.

[Brief explanation of the drawing]

Fig. 1 is a side view of a face milling cutter in which the presser foot is tightened to the throw-away tip set on the tool body, and Figs. 2 and 3 are partial cross-sections of the tightening screw set to the presser foot according to the prior art. Figures 4 and 5 are explanatory diagrams of one embodiment of this invention. Figure 4 is a partial cross-sectional view of the tightening screw set to the presser foot, and Figure 5 is a partial cross-sectional view of the presser foot in operation with respect to the tool body. FIG. 1... Tool body, 4... Throwaway tip, 8... Mounting groove, 9... Presser foot, 12'... Tightening screw, 14... Screw shank, 13... T-shaped slot-shaped tightening groove, 15 ...Head, 16'...male screw.

Claims (1)

[Scope of utility model registration request] The tightening screw that fixes the presser foot for the face milling cutter through the mounting groove of the tool body has a spanner hole in its head and has a male thread at the tip of the screw shank that can be inserted into and removed from the T-shaped slot-shaped tightening groove of the tool body. In the presser foot tightening screw structure of the threaded face milling cutter, the male screw has a larger diameter than the screw shank and has approximately the same diameter as the head with a smooth peripheral surface,
A presser foot clamping screw structure for a face milling cutter, characterized in that the thickness of the head is formed to approximate the groove depth of the head insertion portion of the T-shaped slot-shaped clamping groove. .