JPH0531605A - Cutting processor for plastic material - Google Patents

Abstract

PURPOSE:To provide a plastic material cutting processor which does not generate chatter vibration even in the case of cutting a plastic material and also facilitates cutting tool edge position and angle adjustment and also dissolves the disposal of scraps or the like. CONSTITUTION:A cutting tool retaining member 2 having chip holder fitting portions 5, 6 is provided. A cutting tool 3 to furnish plural chips 8 at a chip holder 9 so that their contact angles with a material A to be cut may become gradually larger, is provided. A scrap cutting device 22 consisting of a scrap cutting movement edge 23 and a scrap cutting fixation edge 25 is provided. Cutting processing is carried out by feeding axially the material A to be cut while the member 2 is being rotated, and at the same time scraps are cut off by means of the device 22 at every one rotation of the member 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic material cutting apparatus suitable for cutting a plastic material such as nylon into a round bar.

[0002]

2. Description of the Related Art Conventionally, there is no dedicated cutting device or tool for cutting a work material A such as a square bar made of plastic such as nylon into a round bar, and even when cutting a plastic material, A cutting device developed for cutting wood, a cutting tool, for example, a normal lathe used for ordinary cylindrical machining and a cutting tool 41 as shown in the front view and side view of FIG. Was there.

[0003]

However, since the optimum cutting conditions such as the cutting speed and the feed speed of the material to be cut and the generation state of chips are completely different between the plastic material and the wood, the device for cutting wood is used. However, there were many problems even if the tools were used as they were.

That is, when cutting a plastic material with an ordinary ordinary lathe and a cutting tool, not only a long time is required for cutting, but also chatter vibration occurs when a plastic material having a relatively small diameter and a long length is cut. However, there is a problem that the surface condition and dimensional accuracy of the processed product become poor.

Further, particularly when cutting a plastic material, the shape and angle of the cutting edge of the cutting tool are delicate, and it is extremely difficult to re-grind it into an accurate shape. Adjustment of the position and angle of the cutting edge of the cutting tool requires skill and still requires a long time, and the work was troublesome.

Further, when a plastic material is cut, chips may become long and band-shaped, and may be entangled with a cutting tool or the like to hinder cutting, and post-processing is also troublesome.

The present invention has been made in view of the above problems, and an object of the present invention is to adjust the position and angle of the cutting edge of a cutting tool without causing chatter vibration even when cutting a plastic material. Another object of the present invention is to provide a cutting device for plastic materials, which makes it easier and eliminates the processing of chips and the like.

[0008]

In order to achieve the above object, in the invention according to claim 1, the contact angle between the cutting tool holding member having the tip holder-mounting portion and the material to be cut is gradually increased. A cutting tool having a plurality of chips mounted on a chip holder, the cutting tool being mounted on the mounting part of the chip holder, and the material to be cut is fed in the axial direction while rotating the cutting tool holding member. As a result, the plastic material is cut.

According to a second aspect of the present invention, there is provided the plastic material cutting apparatus according to the first aspect, wherein the chip cutting movable blade fixed to the cutting tool and the chip cutting fixed blade that cannot be rotated by the rotation preventing member. A chip cutting fixed blade fixed to a mounting member and a chip cutting device including the same are additionally provided.

[0010]

[Function] While the cutting tool holding member is rotated, the material to be cut made of a plastic material is fed in the axial direction. With the tip whose contact angle with the material to be cut is gradually increased, the material to be cut is sequentially rough-cut, semi-finished and finished, and then cut in one step.

Further, the chip cutting device cuts the chips generated from the cutting edge of the cutting tool every one rotation of the cutting tool holding member.

[0012]

Embodiments of the present invention will be described with reference to the drawings.

A cutting apparatus 1 according to a first aspect of the present invention comprises a cutting tool holding member 2 and a cutting tool 3 attached thereto.

The cutting tool holding member 2 is a perspective view of FIG.
Further, as shown in the left side view and the front view in FIG. 2, two chip holder-mounting portions 5 and 6 are provided on the surface of the flat portion 4.

The flat portion 4 is provided with a processed product insertion hole 7 through which a processed product after cutting is passed. Two tip holders
The mounting portions 5 and 6 are formed so as to be symmetrical with respect to the center of the processed product insertion hole 7, and the inner curved surfaces 5a and 6a are slightly larger than the outer diameter of the work material A.

In the present embodiment, two chip holder-mounting portions 5 and 6 are formed, but three or more chip holders may be formed if it is necessary to increase the cutting speed. If it is not necessary to increase the speed, only one may be formed.

The cutting tool 3 comprises a plurality of chips 8 mounted on a chip holder 9 as shown in a front view and a side view of FIG.

The tip 8 is made of cemented carbide and has a substantially square shape with a width b ₁ and a thickness t. The tip 8 has a cutting edge 8a formed on each of the upper and lower ridges, so that a total of eight cutting edges 8 are formed.
a, and a mounting hole 10 is formed at the center.

The tip holder 9 has a substantially rectangular shape,
Three tip insertion grooves 12, 13, and 14 each having a substantially square shape are formed at the front end of the surface, and all the tip insertion grooves 12, 13, and 14 have the same width b ₂ and depth d. The width b ₂ is substantially the same as the width b ₁ of the chip 8 and the depth d is substantially the same as the thickness t of the chip 8.

The tips of the respective chip insertion grooves 12, 13, 14 are located inward as going from the first chip insertion groove 12 to the third chip insertion groove 14.
The distance between the tip of the chip 8 inserted into the chip insertion groove 12 and the tip of the chip 8 inserted into the second chip insertion groove 13 is a ₁ , and the tip of the chip 8 inserted into the second chip insertion groove 13 and the third chip insertion The distance from the tip of the chip 8 inserted in the groove 14 is a ₂ . Here, a ₁ > a ₂ .

The first chip insertion groove 12 is formed on the groove side surface 12a.
Is inclined at an angle α to the left with respect to the radial direction of the work material A,
The second chip insertion groove 13 has a groove side surface 13a inclined leftward by an angle β, and the third chip insertion groove 14 has a groove side surface 14a inclined leftward by an angle γ. Here, for example, α is 45 °, β
Is 10 ° and γ is about 2 °.

The tip holder 9 has a long hole 1 for mounting.
5 is drilled.

The cutting device 1 has the above-mentioned configuration and is used as follows.

First, the tip insertion groove 1 of the tip holder-9
The chip 8 is inserted into 2, 13, and 14 and fixed by the mounting bolt 16. At this time, the chip insertion grooves 12, 13, 14
Since the chip 8 is formed to have substantially the same size as the chip 8 and at a predetermined angle, the chip 8 can be easily mounted, and the chip 8 can be easily inserted into the chip insertion grooves 12, 13, 14 with respect to the work material A. The contact angle is set to a predetermined value.

Next, as shown in FIGS. 1 and 2, the back surface 17 of the tip holder 9 is brought into contact with the side surfaces of the tip holder-mounting portions 5 and 6 of the cutting tool holding member 2 and the tip holder-.
9 is moved toward the center of the flat portion 4 and the tip 8a of the tip 8 is projected from the workpiece insertion hole 7 by a predetermined length to attach the tip holder 9 to the tip holder-attaching portions 5 and 6 with the attaching bolts 18. Mounting.

Then, the cutting tool holding member 2 is mounted on a rotary shaft (not shown) of the cutting machine.

Next, the operation of the cutting apparatus 1 will be described.

As shown in the front view and the side view of the cutting state in FIG. 4, when the cutting tool holding member 2 is rotated and the work material A made of plastic such as nylon is fed from the right in the axial direction, first, Chip 8 mounted in first chip insertion groove 12
The material to be cut is roughly cut by the blade edge 8a. At this time, the material to be cut A and the chip 8 mounted in the first chip insertion groove 12
The contact angle with is 90 ° -α, and the contact angle is small, so that smooth cutting can be performed.

Next, the material A to be roughly cut is
The tip 8a of the tip 8 mounted in the tip insertion groove 13 is used for intermediate finishing. At this time, the contact angle between the material A to be cut and the tip 8 mounted in the second tip insertion groove 13 is 90 °-
It is β, and the contact angle is large enough to allow smooth cutting.

Finally, the material A to be cut is the third chip insertion groove 1
The tip 8a of the tip 8 mounted on the No. 4 finishes the finishing. At this time, the contact angle between the material A to be cut and the chip 8 mounted in the third chip insertion groove 14 is 90 ° -γ, and the contact angle is made large so that the finished surface of the processed product is good and the dimension is Improve accuracy.

As described above, the contact length between the material A to be cut and the cutting edge 8a of the cutting tool 3 is minimized by using a plurality of chips 8, so that chatter vibration is generated even if the material to be cut is plastic. In addition, since the contact angle between the work material A and the plurality of chips 8 is gradually increased, the work material A can be smoothly cut, and the surface condition and dimensions of the processed product can be improved. The accuracy can be good.

A cutting device 21 according to a second aspect of the present invention is the cutting device 1 according to the first aspect further provided with a chip cutting device 22.

As shown in the left side view and the front view of FIG. 5, the chip cutting device 22 has a chip cutting moving blade 23 fixed to the rear end of the chip holder 9 and a chip cutting fixed blade mounting member 2.
4 and a chip cutting fixed blade 25 that is fixed to the outer peripheral surface of No. 4.

The bearing 2 is mounted on the chip cutting fixed blade mounting member 24.
The inner ring member 27 is attached via 6 and the inner ring member 27 is formed with a material insertion hole 28 for allowing the material A to pass therethrough.

The chip cutting device 22 includes a chip cutting moving blade 23.
Is fixed to the rear end portion of the tip holder 9 by a mounting bolt 29, and the inner ring member 27 is fixed to the cutting tool holding member 2 by a mounting bolt 30 to be mounted. Further, a rotation prevention member 31 attached to the main body of the cutting machine is brought into contact with the outer peripheral surface of the chip cutting fixed blade attachment member 24.

When the cutting tool holding member 2 rotates and the cutting edge 23a of the chip cutting moving blade 23 comes closest to the cutting edge 25a of the chip cutting fixed blade 25, the cutting edge 2 of the chip cutting moving blade 23 is moved.
The mounting position of the chip cutting moving blade 23 is adjusted in advance so that the blade 3a and the blade tip 25a of the chip cutting fixed blade 25 are substantially in contact with each other.

The chip cutting device 22 is constructed as described above, and since the chip cutting fixed blade mounting member 24 does not rotate even if the cutting tool holding member 2 rotates, the cutting edge of each chip 8 during cutting. The long strip-shaped chips generated from 8a are the chip cutting moving blades 2 every one rotation of the cutting tool holding member 2.
3 and the chip-cutting fixed blade 25, and the cutting tool 3 does not get entangled as in the conventional case and hinders the work.
Further, post-processing of chips becomes easy.

[0038]

Since the cutting apparatus of the present invention cuts a work piece with a plurality of chips and gradually increases the contact angle between the work piece and the chips, chatter vibration is generated during cutting. It is possible to produce a processed product with good finishing surface and dimensional accuracy without rough cutting and rough finishing in one step, suitable for cutting plastic materials such as nylon, polyethylene, polyacetal, polycarbonate, etc. It is a naive thing.

Further, when the chip holder is mounted, the chip insertion groove is formed so that the material to be cut and the chip have a predetermined contact angle, so that the predetermined angle can be set simply by mounting the chip in the chip insertion groove. It is possible and the mounting work of the tip is extremely easy.

Further, since a plurality of chips to be mounted on the chip holder are made of the same material and have the same shape, it is only necessary to use new ones for the finishing finish, and the used finishing chips are finished in the middle finish. It is possible to use a used semi-finishing chip as a roughing chip as a cutting chip, the number of used chips is small, and it is extremely economical.

Further, in the cutting apparatus provided with the chip cutting device, the chips generated from the tip of the cutting tool are cut every one rotation of the cutting tool holding member, so that the chips are not entangled with the cutting tool. The workability is excellent and the post-treatment of chips is easy.

[Brief description of drawings]

FIG. 1 is an external perspective view of a cutting apparatus according to the present invention.

FIG. 2A is a left side view of the cutting device,
(B) is the same front view.

3A is a front view of the cutting tool, and FIG. 3B is a right side view of the same.

FIG. 4A is a front view showing a state in which a material to be cut is cut by the cutting apparatus of the present invention, and FIG.
It is a side view.

FIG. 5 (a) is a left side view of a cutting device provided with a chip cutting device, and FIG. 5 (b) is a front view of the same.

FIG. 6A is a front view showing a state in which a material to be cut is cut by a conventional cutting device, and FIG. 6B is a side view of the same.

[Explanation of symbols]

1 cutting equipment 2 Cutting tool holding member 3 cutting tools 5 Chip holder-mounting part 6 Chip holder-mounting part 8 chips 9 Chip holder 21 Cutting equipment 22 Chip cutting device 23 Chip cutting moving blade 24 Chip cutting fixed blade mounting member 25 Chip cutting fixed blade 31 Anti-rotation member A cutting material

Claims (2)

[Claims] 1. A chip holder-a cutting tool holding member having a mounting portion, and a cutting tool comprising a plurality of chips each having a contact angle with a material to be cut gradually increased, mounted on the chip holder. A cutting device for a plastic material, characterized in that a cutting tool is attached to the tip holder-mounting portion, and the cutting material is fed in the axial direction while the cutting tool holding member is rotated to perform cutting work. 2. A chip cutting device comprising: a chip cutting moving blade fixed to the cutting tool; a chip cutting fixed blade fixed to a chip cutting fixed blade mounting member that cannot be rotated by a rotation preventing member; An apparatus for cutting a plastic material according to claim 1, which is characterized in that.