JP2001001330A - Apparatus for cutting extrusion molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To upgrade sharpness in the case of cutting a soft extrusion molding. SOLUTION: The apparatus for cutting an extrusion molding comprises a frame 3 for extending under tension a wire 2 for cutting the molding 8 in a direction crossing the molding 8 and having a base 31 movable in a cutting direction of the molding 8 and a frame body 32 oscillatorily supported to the base 31 at a rotary shaft 33 as a center in a direction along the wire 2, and a driving means 6 fixing both ends of the wire 2 to the body 32 to vibrate the body 32 in the direction along the wire 2. With this constitution, the wire 2 can be vibrated in a lengthwise direction even without directly driving the wire 2, and draw cutting is realized in the state having no vibration of a deflecting direction of the wire 2 for causing an increase in a cutting resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a device for cutting an extruded product.

[0002]

2. Description of the Related Art Extrusion molding is widely known as a method for molding soft materials, and is applied to molding of ceramics, synthetic resins and the like. For example, it is applied to the manufacture of a ceramic honeycomb structure used as a carrier of a catalyst for purifying exhaust gas. In extrusion molding, a material in a kneaded state before molding is given a predetermined sectional shape by a molding device and extruded. The continuously extruded compact is cut into a predetermined length by a cutting device. In the cutting device, a wire for cutting an extruded body is stretched on a frame, and the extruded body is cut by the wire by moving the frame in a cutting direction of the extruded body. At this time, if the sharpness is poor, the cut surface is deformed or crushed. Therefore, a sharp cutting device is desirable. For example, in the ceramic honeycomb structure, when the cell wall thickness is reduced to 100 μm or less, the shape retention is considerably reduced. Therefore, sharpness is important.

[0003] Japanese Patent Publication No. 4-60402 discloses a reciprocating method in which a cutting wire is suspended on a pair of pulleys arranged at a predetermined interval, and both ends of the wire are alternately pulled while tension is applied to the wire. There is a device in which a moving mechanism is provided to alternately reciprocate the wire in the length direction, thereby adding a pulling operation to the cutting operation of the wire to reduce cutting resistance and improve sharpness. Also, JP-A-63-6710
In Japanese Patent Laid-Open No. 5 (1999) -1995, there is a device in which a cutting wire is connected at one end to a spring and a vibrator or other vibrator is connected at the other end to perform a pull-off operation.

[0004]

However, Japanese Patent Publication No. 4-60402 and Japanese Patent Application Laid-Open No. 63-6710 are disclosed.
In the technique described in Japanese Patent Application Laid-Open No. 5-205, when the stroke of the reciprocating movement of the wire is increased or the speed thereof is increased in order to enhance the effect of the pull-off, the wire tension fluctuates and the bending of the wire increases. As a result, there is a problem that the cutting resistance increases due to the influence of the motion component in the bending direction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an extruded body cutting device which is sharp and has no sharpness in the wire.

[0006]

According to the first aspect of the present invention, a wire for cutting an extruded body is stretched on a frame in a direction crossing the extruded body, and the frame is moved in a cutting direction of the extruded body. Then, the extruded body is cut by the wire. Further, the frame has a base portion movable in a cutting direction of the extruded body, and a frame body portion supported on the base portion so as to be finely movable in a direction along the wire. Both ends of the wire are fixed to the frame body. A drive means for reciprocating the frame body in the direction along the wire is provided.

Since the wire can be reciprocated in a direction crossing the extruded body without directly driving the wire,
Even if the stroke of the reciprocating movement of the wire is lengthened or the speed is increased, the wire does not bend, and excellent sharpness can be exhibited even for an extruded body having low shape retention.

According to the second aspect of the present invention, the frame main body is pivotally supported on the base in a direction along the wire. The point of action of the drive means on the frame body is decentered from the pivot point of the frame body, and the amount of eccentricity is set smaller than the distance between the wire and the pivot point.

[0009] Since the reciprocating motion given to the driving action point by the driving means is amplified at the wire position, the driving means can be miniaturized.

According to the third aspect of the present invention, the base and the frame main body are connected by an elastic member.

[0011] The frame main body can be slightly moved in the direction along the wire within a range where the elastic member is elastically deformed, and the driving means can efficiently reciprocate the frame main body by the spring action of the elastic member. .

[0012]

1, 2, 3, and 4 show an apparatus for cutting an extruded product according to the present invention. The cutting device is shown in FIG.
The extruded body 8 having a circular cross section, which is extruded from the near side, is cut into a predetermined length. The extruded body 8 is stretched in a direction crossing the extruded body 8 (the left-right direction in FIG. 1) to cut the extruded body 8. It comprises a cutting mechanism 1 having a wire 2 and a guide 7 for feeding the cutting mechanism 1 in the cutting direction of the extruded body 8 (vertical direction in FIG. 1). In the illustrated example, the extruded body 8 is a ceramic honeycomb structure used for an exhaust gas purifying catalyst or the like.

The cutting mechanism 1 has a frame 3 for stretching the wire 2. The frame 3 is formed such that a base 31 formed of a rigid material such as stainless steel in the shape of a rectangular flat plate and a frame main body 32 overlap with each other, and an extruded body 8 is formed.
It is arranged so as to intersect with. Further, the base 31 and the frame main body 32 are connected by a rotating shaft 33 and a connecting member 5 described later. Base 31, frame body 3
2, cutouts 301 and 302 wider than the diameter of the extruded body 8 are formed in the cutting direction of the extruded body 8, respectively, so that the extruded body 8 can pass through. In the guide 7, a notch 701 wider than the diameter of the extruded body 8 is formed in the cutting direction of the extruded body 8, so that the extruded body 8 can pass through.

The notch 3
The wire support pins 4 project from each other at positions opposing each other with the wire 02 interposed therebetween, and the wires 2 are stretched between the two wire support pins 4. Both ends of the wire 2 are fixed to the wire support pins 4 by winding them around the wire support pins 4 several times and then applying an adhesive tape (not shown) from above.
Generates a constant tension. An ultra-fine tungsten wire or the like is used for the wire 2. It should be noted that the wire 2 can be fixed to the wire support pins 4 by using a known mechanical fixing means in addition to the adhesive tape.

The base 31 is slidably held in a groove 701 formed in the cutting direction on the surface of the guide 7 facing the base 31 so that the frame 3 can move in the cutting direction of the extruded body 8. A handle 311 is provided on an end wall of the base 31 so that an operator can move the cutting mechanism 1.

The rotating shaft 33 is provided in a direction perpendicular to the wire 2 at a position perpendicular to the cutting direction in the direction in which the extruded body 8 is extruded.
It swings in the direction along the wire 2 with the position as a pivot point.

The connecting member 5 is provided in a flat space between the base 31 and the frame main body 32. The coupling member 5 is formed by projecting screw portions 52 and 53 from both ends of a rod-like elastic body 51 such as rubber along the axis of the elastic body 51.
The base part 31 and the frame main body part 32 are connected by 2 and 53. The coupling member 5 limits the rotation angle range of the frame main body 32 around the rotation axis 33, and the frame main body 32 can move in the direction along the wire 2 only within a small range where the elastic body 51 bends and deforms.

The connecting members 5 are provided at a total of four places. The locations of the four coupling members 5 are substantially evenly distributed on the wire 2 side from the position of the rotation shaft 33, and the base portion 3
An excessive load is not applied to the rotating shaft 33 when the frame 1 and the frame main body 32 are connected to each other. The number of attachments of the coupling member 5 is preferably large from the viewpoint of the coupling strength.
If it is too large, the moving range of the frame main body 32 is reduced, so that about 3 or 4 is desirable.

The frame body 32 includes a rotating shaft 3.
At a position eccentric from 3, a vibration generator 6 as a driving means is provided. The vibration generator 6 drives the frame body 32, and the motor 6 screwed to the frame body 32
1 and an eccentric disk 62 fixed to the shaft end. The eccentric disk 62 has an arm portion 622 extending from the periphery of a perfect circular disk 621 coaxially attached to the shaft of the motor 61, and a weight 623 at its tip.
The center of gravity of the eccentric disk 62 is eccentric by the weight 623 from the axis of the motor 61 (center of rotation). The center of gravity of the eccentric disk 62 is
When the motor 61 is rotated by energization, it revolves around the rotation center of the motor 61. The rotation speed of the motor 61 is set to a high speed range to such an extent that the frame main body 32 vibrates due to the revolving motion of the center of gravity of the eccentric disk 62. In addition, the eccentric disk is not only the one in the figure,
What is necessary is that the center of gravity and the rotation center do not match.

The operation of the cutting device according to the present invention will be described. The operator holds the frame 3 while the motor 61 is energized.
The grip 311 is pulled to move the cutting mechanism 1 in the cutting direction. As the cutting mechanism 1 moves, the wire 2 is
Disconnect.

The frame body 32 vibrates as the center of gravity of the eccentric disk 62 revolves, but the movement of the frame body 32 is in the direction along the wire 2 about the rotation axis 33 as described above. , The frame body 32 is only reciprocated (vibrated) substantially only in the direction along the wire 2. Thus, the wire 2 integrated with the frame body 32 also vibrates only in the length direction. Since the wire 2 is fixed to the wire support pin 4, the tension of the wire 2 is constant, and the wire 2 does not bend even if the vibration amplitude or frequency increases. In addition, since the frame main body 32 and the base 31 are connected via the elastic body 51, the driving force generated by the vibration generator 6 due to the spring action due to the bending of the elastic body 51 causes the vibration of the frame main body 32 to vibrate. The conversion is performed efficiently, and the vibration of the wire 2 is performed stably.

At the time of cutting the extruded body 8, the movement of the wire 2 is added to the movement of the wire pulling by the action of the vibration generator 6.
As described above, the wire 2 vibrates only in the direction intersecting with the extruded body 8 and does not generate a vibration component in the extrusion direction of the extruded body 8 due to bending, so that excellent sharpness is exhibited.

As shown in FIG. 5, the point at which the frame main body 2 is driven by the vibration generator 6 (the position at which the motor 61 is mounted) is determined by the amount of eccentricity L2 from the position of the rotation shaft 33.
Since the distance between the wire 2 and the rotating shaft 33 is set to be shorter than the distance L1, the vibration given to the above-mentioned driving action point by the vibration generator 6 is L1 / L2 at the position of the wire 2.
It is doubled and a large stroke (vibration amplitude) can be given to the reciprocating motion of the wire 2 even with the small vibration generating unit 6.

According to the cutting apparatus of the present invention, a cell wall thickness of 0.0
FIG. 6 shows a result obtained by cutting a honeycomb structure having a diameter of 6 mm, a cell pitch of 0.9 mm, and an outer diameter of 100 mm, and examining a crushed deformation of a cut surface as shown in FIG. In addition, the judgment was ○ when the amount of crushing deformation was less than 1 mm, and × when 1 mm or more. The wire 2 has a diameter of 0.05 mm.
1 / L2 = 3. In the table, comparative examples for comparison with examples of the present invention are also shown. In Comparative Example 1, the rotary shaft 33 was removed from the configuration of the Example, and free vibration was generated in the wire 2 without being limited to the length direction.
In the configuration of the embodiment, the motor 61 is turned off, and the wire 2 is not vibrated, so that the configuration is substantially the simplest.

As can be seen from Table 1, in Example 1 where the frequency of the wire 2 is 60 Hz and the amplitude is 4 mm, the amount of crushing deformation is 0.8 mm, and the example where the frequency is 65 Hz and the amplitude is 6.5 mm. In 2, the crush deformation amount is 0.3 mm
In each case, the honeycomb structure 8 having a cell wall thickness of 0.1 mm or less could be cut at a clean cut surface. On the other hand, in Comparative Example 2 in which no vibration was applied to the wire, the amount of crushing deformation reached 6.5 mm. Thus, each of the above embodiments exhibits excellent sharpness. Further, in Comparative Example 1 having no vibration amplification effect, the vibration amplitude was 2 mm and the amount of crushing deformation was as in Example 2 even when the driving conditions of the motor 61 were the same as in Comparative Example 2.
This is 2.5 mm, which is larger than that, and it can be seen that according to the configuration of the present embodiment, excellent sharpness can be obtained even with a small motor 61 due to the vibration amplification action.

[0026]

[Table 1]

In the illustrated example, the eccentric disk 62 is rotated by the motor 61 to vibrate the frame main body 32. However, another configuration may be used. 7 and 8 show a frame main body 32 to which another driving means is attached, and a vibrator 6A is attached as the driving means. Vibrator 6A
The mounting direction is determined so that the vibration direction is the swing direction of the frame main body 32, and the frame main body 32 is vibrated in the direction along the wire 2. As the vibrator 6A, an air type or the like may be used in addition to the electric type.

Also, by providing an elastic member for efficiently vibrating the frame main body in the flat space between the base of the frame and the frame main body, an effect of increasing the coupling strength between the base and the frame main body is provided. Is obtained.
If there is no problem in strength due to the single connection of the rotating shaft between the base portion and the frame main body portion, or if reinforcement is possible by other means, the elastic member can be provided in another place.
For example, a protruding portion that protrudes to the side of the frame main body is provided on the base portion, and a spring that expands and contracts in the swinging direction of the frame main body is provided between the protruding portion and the frame main body as an elastic member.

In the illustrated example, the frame body is reciprocated in the direction along the wire by swinging the frame body relative to the base. May be mounted as a stage that is one-dimensionally movable in the direction along the wire.

[Brief description of the drawings]

FIG. 1 is a plan view of a device for cutting an extruded product of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a view as viewed in the direction of the arrow A in FIG. 1;

FIG. 4 is an exploded view of a cutting mechanism of the cutting device of the present invention.

FIG. 5 is a front view of a cutting mechanism of the cutting device of the present invention.

FIG. 6 is a view of a cut portion of an extruded product.

FIG. 7 is a front view of a frame body showing a modified example of the extruded body cutting device of the present invention.

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting mechanism 2 Wire 3 Frame 31 Base part 32 Frame main body part 33 Rotation axis 4 Wire support pin 5 Coupling member (elastic member) 51 Elastic body 52, 53 Screw part 6 Vibration generation part (drive means) 61 Motor 62 Eccentric disk 6A vibrator (drive means) 7 guide 8 extruded body

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tomohiko Nakanishi 14 Iwatani, Shimowakaku-cho, Nishio-shi, Aichi Prefecture Inside Japan Automotive Parts Research Institute (72) Inventor Hitoshi Uemura 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. F-term in DENSO (reference) 4G055 AA08 AB03 AC10 BB13

Claims (3)

[Claims] 1. An extrusion molding method in which a wire for cutting an extruded body is stretched on a frame in a direction crossing the extruded body, and the frame is moved in a cutting direction of the extruded body to cut the extruded body with the wire. In the body cutting device, the frame, a base portion movable in the cutting direction of the extruded body,
The base has a frame main body supported so as to be finely movable in the direction along the wire, and both ends of the wire are fixed to the frame main body, and the frame main body is oriented in the direction along the wire. A cutting device for extruded articles, comprising a driving means for reciprocating the extruded body. 2. The extruded product cutting apparatus according to claim 1, wherein the frame main body is pivotally supported on the base portion so as to be swingable in a direction along the wire, and the driving means controls the frame main body portion with respect to the frame main body portion. An extruded body cutting device in which a driving action point is eccentric from a shaft fulcrum of the frame main body, and the amount of eccentricity is set to be smaller than an interval between the wire and the shaft fulcrum. 3. The apparatus for cutting an extruded product according to claim 1, wherein the base and the frame body are connected by an elastic member.