JP3454184B2 - Cutting method of soft molded body - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for cutting a soft-molded body which can be cut without deforming an extruded soft-molded body, and particularly to a method for cutting a soft-molded body extruded in a honeycomb shape without deforming it. The present invention relates to a method for cutting a soft molded body that can be cut.

[0002]

2. Description of the Related Art Conventionally, as a method of cutting a soft molded body extruded into a honeycomb shape, for example, into a desired length, there is a method of cutting with a wire in a direction transverse to the extrusion direction. When cutting the soft molded body, it is necessary to use a thin wire as much as possible in order to suppress the deformation of the soft molded body. However, there is also the problem that thin wires are easily broken during the cutting operation.

As a technique for solving the above problems, Japanese Patent Application Laid-Open No. 10-34639 discloses a method of adjusting the tension applied to a wire and cutting the soft molded body so that the wire is not broken during the cutting operation. Has been done.

[0004]

However, the above conventional method for cutting a soft molded article has the following problems. That is, in the above cutting method, the tension applied to the wire is 1 to 5 k.
Although adjusted to gf, the thickness of the wire that can be used is also limited in this case.

For example, when a honeycomb formed body having a thin wall thickness of 0.1 mm is cut, its shape is easily deformed by the cutting. Therefore, in this case, it is necessary to use a particularly thin wire having a diameter of 0.1 mm or less. In such a case, the wire may be cut even by using the conventional cutting method.

When the tension acting on the wire during the cutting operation is analyzed, the combined tension is a tension T ₁ caused by the running of the wire itself and a tension T ₂ caused by the interaction between the wire and the soft molded body. Can be divided. By the way, in the above cutting method, as shown in FIGS. 9 (A) and 9 (B), the traveling speed V of the wire and the amount of cut movement D into the soft molded body are linearly changed. Therefore, in particular, the tension T ₁ becomes large at the start of running of the wire, and the tension T ₂ becomes large at the start of cutting into the soft molded body.

Therefore, at these two time points, the composite tension T (= T ₁ + T ₂ ) acting on the wire becomes larger than the tensile strength S of the wire (FIG. 9C). As a result, the thin wire as described above will break. Also,
As described above, in order to cut a honeycomb formed body having a small wall thickness without deforming it, it is necessary to delicately control the operation of the wire.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to cut the soft molded body without deforming the soft molded body and without breaking the wire.
An object of the present invention is to provide a method for cutting a soft molded body.

[0009]

According to a first aspect of the present invention, in a method of cutting an extruded soft molded body with a wire in a direction transverse to an extruding direction, the flexible molded body is disposed between a driving side bobbin and a driven side bobbin. When the cut wire is cut by the servo motor for winding, the wire thus cut is moved in the length direction thereof and moved by the servo motor for cutting toward the soft molded body. ， In order to make the movement of the wire so that the following synthetic tension acting on the wire during the cutting operation from the start of running the wire to the end of cutting does not exceed the specified value,
A method for deciding a drive program for the winding servomotor and the cutting servomotor, controlling the composite tension to be equal to or lower than the tensile strength of the wire, and cutting the soft molded body, wherein the composite tension is: The tension due to the moment of inertia of the driven side bobbin at the start of traveling of the wire, the tension caused by the torque acting on the driven side bobbin, the tension caused by the resistance generated by the friction between the wire and the soft molded body at the time of cutting, and the wire The method for cutting a soft molded article is characterized in that the tension generated by cutting into the soft molded article is applied to a wire which is a composite wire.

What is most noticeable in the present invention is a drive program for the winding servomotor and the cutting servomotor so that the combined tension does not exceed a predetermined value during the cutting operation. Is to decide.

Next, the function and effect of the present invention will be described.
In the cutting method, the wire is controlled so that the combined tension does not exceed a predetermined value during the cutting operation. Therefore, it is possible to prevent the composite tension applied to the wire from increasing during the cutting operation and exceeding the tensile strength of the wire. Therefore, there is no risk of the wire breaking during the cutting operation. Therefore, a thinner wire can be used, and the soft molded body can be easily cut without being deformed.

The wire is moved and moved by the winding servomotor and the cutting servomotor. Then, the winding servo motor and the cutting servo motor are driven according to the drive program. Therefore, since the wire can be made to move subtly, it is possible to obtain a cutting method in which the soft molded body is less likely to be deformed.

As described above, according to the present invention, it is possible to provide a method for cutting a soft molded product which can cut the soft molded product without deforming the soft molded product and without breaking the wire.

Next, as in the second aspect of the present invention, the soft molded body may be extruded into a honeycomb shape. Also in this case, the soft molded body can be cut without deforming the honeycomb shape.

Next, as in the invention described in claim 3, it is preferable that the traveling speed of the wire is 50 to 200 m / min. As a result, it is possible to obtain a method for cutting a soft molded body in which deformation of the soft molded body is less likely to occur. If the traveling speed is less than 50 m / min, the soft molded body may be deformed. On the other hand, the above running speed is
If it exceeds 200 m / min, the wire may be broken.

Next, as in the invention described in claim 4, it is preferable that the diameter of the wire is 0.06 to 0.12 mm. As a result, it is possible to obtain a method for cutting a soft molded body in which deformation of the soft molded body is less likely to occur. When the diameter is less than 0.06 mm, the tension applied to the wire becomes larger than the tension of the wire itself, and the wire may be cut during the cutting operation. On the other hand, when the diameter exceeds 0.12 mm, the force applied to the wall of the soft molded body becomes large, and the soft molded body may be deformed during cutting.

Next, as in the invention described in claim 5, the soft molded body may be a honeycomb molded body having a wall thickness of 0.04 to 0.125 mm. Also in this case, the soft molded body can be cut without deforming the shape of the honeycomb. When the wall thickness is less than 0.04 mm, the strength of the wall of the soft molded body is small and the soft molded body may be deformed during cutting.

On the other hand, when the wall thickness exceeds 0.125 mm, the tension caused by the interaction between the wire and the soft molded body becomes large. Therefore, the cutting is not completed within the time of the driving program, the traveling speed of the wire is reduced, the wire is stopped, and the wire is caught by the soft molded body.
As a result, the wire may be cut when the next operation is performed. Further, in order to cut the soft molded body so as not to cut the wire, it is necessary to greatly increase the cutting time, which may result in a significant decrease in productivity.

Next, as in the invention described in claim 6, the torque acting on the driven side bobbin is the torque at the time of rising of the torque variable one-way clutch mounted on the driven side bobbin and the torque at the time of steady running. Is preferred. This makes it possible to more reliably cut the soft molded body without deforming the soft molded body and without breaking the wire.

The variable torque one-way clutch connects the rotating shafts arranged between the winding servo motor and the driving side bobbin and between the winding servo motor and the driven side bobbin. A mechanism to do. That is, on the drive side, the torque variable one-way clutch integrally connects the motor shaft of the winding servo motor and the bobbin shaft of the drive side bobbin. On the other hand, on the driven side, the motor shaft and the bobbin shaft of the driven side bobbin are connected while sliding while maintaining a predetermined torque therebetween. Further, the setting of the predetermined torque can be changed within a specific range.

Next, as in the invention described in claim 7, it is preferable that the change in the acceleration of the traveling speed of the wire and the change in the acceleration of the moving speed in the cutting direction are changed for a while. When the traveling speed of the wire and the acceleration of the moving speed change, a large tension is applied to the wire, and the tension increases as the change in the acceleration increases.

That is, a large tension is generated in the wire at the time of transition from low acceleration to high acceleration, and at the time of transition from high acceleration to low acceleration, the wire is once slackened and then the wire is in a tensioned state. Large tension is generated. On the other hand, according to the present invention, it is possible to prevent the tension applied to the wire from increasing as described above. Therefore, it is possible to obtain a method of cutting a soft molded body in which the wire is more difficult to break during the cutting operation.

Next, as in the invention described in claim 8, the composite tension acting on the wire during the cutting operation is 1 k.
It is preferably gf or less. This gives, for example,
It is possible to use a thin wire having a diameter of 0.1 mm or less. When the above synthetic tension exceeds 1 kgf,
When a thin wire is used, the wire may be cut during the cutting operation.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 A method for cutting a soft molded body according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the method of cutting the soft molded body of this example is a method of cutting the soft molded body 3 extruded in a honeycomb shape with a wire 11 in a direction transverse to the extrusion direction.

That is, as shown in FIGS. 1 and 2, the wire 11 disposed between the driving side bobbin 12 and the driven side bobbin 13 is run in the lengthwise direction by a winding servo motor 21. At the same time, it is moved toward the soft molded body 3 by the servomotor 22 for cutting. As a result, the soft molded body 3 is cut by the wire 11.

At this time, the movement of the wire 11 is controlled so that the following combined tension acting on the wire 11 during the cutting operation from the start of running the wire 11 to the end of cutting does not exceed a predetermined value. That is, the drive programs of the winding servo motor 21 and the cutting servo motor 22 are determined so that the wire 11 moves. Then, as shown in FIG. 7, the synthetic tension is controlled to be equal to or lower than the tensile strength of the wire 11, and the soft molded body 3 is cut.

The combined tension is the tension due to the moment of inertia of the driven side bobbin 13 at the start of traveling of the wire 11, the tension due to the torque acting on the driven side bobbin 13, and the wire 11 and the soft molding 3 at the time of cutting.
It is the tension acting on the wire 11 that is a combination of the tension caused by the resistance caused by the friction with and the tension generated by the cut of the wire 11 into the soft molded body 3.

Next, the cutting device for the soft molded body will be described.
This will be described with reference to FIGS. The cutting device 1 is shown in FIG.
As shown in FIG. 2, the main body portion 10, a frame 14 movable up and down with respect to the main body portion 10, the driving side bobbin 12 and the driven side bobbin 13 mounted on the frame 14, and arranged between them. It has a wire 11. The diameter of the wire 11 is 0.08 mm.

The frame 14 is moved up and down with respect to the main body 10 by the cutting servo motor 22, and the drive side bobbin 12 is rotated by the winding servo motor 21 (FIG. 3). Further, the driven bobbin 13 is
As shown in FIG. 4, the wire 11 rotates following the traveling of the drive side bobbin 12.

The winding servo motor 21 is used.
3 is also provided on the driven side bobbin 13, as shown in FIG. 3, and has a structure in which the driven side bobbin 13 can be driven to cause the wire 11 to run in the opposite direction. In addition, as shown in FIG.
A torque-variable one-way clutch 15 is provided on each of the driven bobbin 2 and the driven-side bobbin 13 to prevent the loosening of the wire 11. Further, the main body 10 is moved by the moving servomotor 23 on the two rails 19 in parallel with the pushing direction of the soft molded body 3.

Further, in FIGS. 1 and 2, reference numeral 221
Is a feed screw for cutting which is rotated by the servo motor 22 for cutting and moves the frame 14 up and down. Further, reference numeral 231 is a moving feed screw that moves the cutting device 1 by being rotated by the moving servo motor 23.

Next, a method of cutting the soft molded body 3 will be described in detail. As shown in FIG. 2, the soft molded body 3
The raw material 30 is extruded from the forming die 5 to form the honeycomb-shaped soft formed body 3. The wall thickness of the honeycomb of the soft molded body 3 is as small as 0.075 mm. The soft molded body 3 is placed on a plurality of pedestals 4 arranged at equal intervals on the roller conveyor 61, and is sequentially conveyed at the same speed as the extrusion speed. The cradle 4 is
By the cradle feeding unit 64, the soft molded body 3 immediately after being extruded is sequentially fed from below.

The conveyed soft molded body 3 is cut by the wire 11 of the cutting device 1 in the gap between the receiving trays 4 and 4. The cut soft molded body 31 at the end is separated by the speed-changing type separating conveyor 62 together with the receiving table 4, and the next high-speed conveyor 63 is further separated.
Is transported to the next process.

When the soft molding 3 is cut by the cutting device 1, the soft molding 3 is in the conveyed state as described above. Therefore, in order to cut the soft molded body 3 at a right angle, as shown in FIGS. 5 and 6, the wire 11 is moved downward while moving forward in accordance with the running speed of the soft molded body 3. Need to let.

That is, the movements of the moving servo motor 23 and the cutting servo motor 22 are controlled to move the wire 11 as follows. First, when the soft molded body 3 reaches a predetermined position, the cutting device 1 is started by the detection signal of the cutting start confirmation sensor, and the wire 11 is run by the winding servo motor 21 (see FIG. 5).
(A)). The traveling speed is 90 to 200 m / min.

Next, the moving servo motor 23 moves the cutting device 1 forward at the same speed as the extrusion speed of the soft molded body 3, and the cutting servo motor 22 moves the wire 11 to the soft molded body 3. It is moved toward (FIG. 5 (B)). Next, the cutting servo motor 22 and the moving servo motor 23 move the wire 11 in accordance with the conveying speed of the soft molded body 3 to cut the soft molded body 3 (FIG. 5 (C),
(D)).

Then, the individual pieces 31 of the cut soft molded body
Is separated from the soft molded body 3 by moving it at a high speed together with the pedestal 4 (FIG. 6 (E)). Next, from the space between the individual piece 31 and the soft molded body 3, the wire 1 is inserted.
1 is moved upward and returned to its original position (Fig. 6 (F),
(G)). Then, similarly, the next cutting is performed.

When the soft molded body 3 is cut, the wire 11 is tensioned by various factors. As described above, the factors are the tension due to the moment of inertia of the driven side bobbin 13 at the start of traveling of the wire 11, the tension due to the torque acting on the driven side bobbin 13, and the wire 11 and the soft molded body at the time of cutting. The tension caused by the resistance caused by friction with 3 and the wire 1
There is a tension generated by the incision of 1 into the soft molded body 3.

The torque acting on the driven side bobbin 13 is divided into a torque at the time of rising of the torque variable one-way clutch 15 mounted on the driven side bobbin 13 and a torque at the time of steady running.

The tension due to the moment of inertia of the driven side bobbin 13 at the start of traveling of the wire 11 is
It is the moment of inertia when the driven bobbin 13 starts rotating from a stationary state. Further, the tension generated by the incision of the wire 11 into the soft molded body 3 means that the wire 11 is pressed from the soft molded body 3 when the wire 11 is pressed at the time of cutting as shown in FIG. Tension due to reaction force. When this tension acts, the wire 11 is bent as shown in FIG.

At the time of cutting the soft molded body 3, the composite tension of these various tensions is controlled so as not to exceed the tensile strength of the wire 11. Specifically, the composite tension is controlled to 1 kgf or less. As a means thereof, the tension due to the moment of inertia of the driven side bobbin 13 at the start of the traveling and the torque at the rising of the torque variable one-way clutch 15 are suppressed by gently starting the wire 11 (Fig. 7 (A)). That is, the wire 11
The running speed V of is started at a low acceleration.

The torque of the torque variable one-way clutch 15 during steady running is suppressed by changing the torque by a torque adjusting mechanism built in the torque variable one-way clutch. The movement of the wire 11 is performed by controlling the winding servo motor 21.

Further, the tension caused by the resistance generated by the friction between the wire 11 and the soft molded body 3 and the soft molded body 3
The tension generated by the cutting of the wire 11 is suppressed by making a slight increase in the cutting movement amount D of the wire 11 at the start of cutting (FIG. 7 (B)). The movement of the wire 11 as described above is performed by controlling the servomotor 22 for cutting.

That is, as shown in FIG. 7C, the combined tension applied to the wire 11 during the cutting operation is 1 k.
The above-mentioned winding servo motor 21 so as to be gf or less.
And a drive program for the servomotor 22 for cutting is determined. The drive program is determined by conducting a test in advance.

In FIG. 7C, the wire 1
The tension T ₁ caused by the traveling of ₁ and the tension T ₂ caused by the interaction between the wire 11 and the soft molded body 3 are divided into
The changes during the cutting operation are schematically illustrated. The total of the tension due to the moment of inertia of the driven side bobbin 13 at the start of traveling of the wire 11 and the tension due to the torque acting on the driven side bobbin 13 corresponds to the tension T ₁ .

The total of the tension caused by the resistance generated by the friction between the wire 11 and the soft molded body 3 at the time of cutting and the tension generated by the cutting of the wire 11 into the soft molded body 3 is the tension T ₂ . Equivalent to. Then, the total of the tension T ₁ and the tension T ₂ becomes the combined tension T acting on the wire 11. That is, T = T ₁ + T ₂ . In FIG. 7C, the start of cutting means the time when the wire 11 contacts the upper end of the soft molded body 3 (FIG. 5B), and the end of cutting means that the line connecting both ends of the wire 11 is soft molded. It refers to the point in time when it has passed the lower end of the body 13 (FIG. 5C). Therefore,
At the time of finishing the cutting, the cutting of the soft molded body 3 is not actually completed.

Next, the function and effect of this example will be described. In the above cutting method, the wire 1 whose combined tension T does not exceed a predetermined value (1 kgf) during the cutting operation.
The movement is controlled to be 1. Therefore, it is possible to prevent the composite tension T applied to the wire 11 from increasing during the cutting operation to become equal to or higher than the tensile strength of the wire 11. Therefore, there is no possibility that the wire 11 will break during the cutting operation. Therefore, a thinner wire can be used, and the soft molded body 3 can be easily cut without being deformed.

The wire 11 is run and moved by the winding servo motor 21 and the cutting servo motor 22. Then, the winding servo motor 21 and the cutting servo motor 22 are driven according to the drive program. Therefore, since the wire 11 can realize a subtle movement, it is possible to obtain a cutting method in which the soft molded body 3 is less likely to be deformed.

As described above, according to the present embodiment, it is possible to obtain a method for cutting a soft molded body which can cut the soft molded body without deforming the soft molded body and without breaking the wire. As described above, this example shows an example in which the honeycomb-shaped soft molded body 3 having a wall thickness of 0.075 mm is cut by the wire 11 having a diameter of 0.08 mm. When the molded body was cut in the same manner as in this example, it could be cut in the same manner.

Embodiment 2 As shown in FIG. 8, this embodiment is an example in which an appropriate cutting operation pattern is selected from among several kinds of cutting operation patterns prepared in advance in accordance with the type of soft molding to be cut. Is.
That is, depending on the shape, structure, material, etc. of various soft molded products,
A cutting operation pattern that does not deform the soft compact and does not break the wire is prepared in advance by performing a test. Then, the cutting operation pattern is stored in the memory in the controller C. The drive programs for the winding servo motor and the cutting servo motor are determined according to the cutting operation pattern.

When cutting the soft molded body, first,
Data about the soft compact is input to the controller C (S1). Next, an appropriate cutting operation pattern is selected from several kinds of cutting operation patterns based on the input data of the soft molded body (S2).

Then, a drive command is issued to each servo motor based on the selected cutting operation pattern by the cutting start signal from the cutting start confirmation sensor (S3). As a result, the winding servo motor and the cutting servo motor are driven in accordance with the drive program, and the cutting operation of the cutting device is started. In addition, in the above and FIG. 8, S1 to S3 represent Step1 to Step3, respectively. Others are the same as those in the first embodiment.

According to the cutting method of this example, an appropriate cutting operation can be performed according to the type of soft molded body to be cut. Therefore, according to this example, there is obtained a method for cutting a soft molded body which does not deform the soft molded body having various shapes, structures, materials, etc. and can cut the soft molded body without breaking the wire. be able to. The other functions and effects are the same as those of the first embodiment.

[Brief description of drawings]

FIG. 1 is a front view of a cutting device according to a first embodiment.

FIG. 2 is a side view of the cutting device and the soft molded body according to the first embodiment.

FIG. 3 is an explanatory diagram around a wire of the cutting device according to the first embodiment.

FIG. 4 is an explanatory view of a wire at the time of cutting into a soft molded body according to the first embodiment.

FIG. 5 is an explanatory diagram of a method for cutting a soft molded body according to the first embodiment.

FIG. 6 is an explanatory view showing the operation of the wire after cutting the soft molded body, following FIG. 5 in the first embodiment.

FIG. 7 is a diagram showing (A) and (B) cutting operation patterns and (C) changes in tension acting on the wire in the first embodiment.

FIG. 8 is an explanatory diagram of a method for cutting a soft molded body according to the second embodiment.

FIG. 9 is a diagram showing (A), (B) a cutting operation pattern and (C) a change in tension applied to a wire in a method of cutting a soft molded body in a conventional example.

[Explanation of symbols]

1. ． ． Cutting device, 11. ． ． wire, 12. ． ． Drive side bobbin, 13. ． ． Driven bobbin, 21. ． ． Servo motor for winding, 22. ． ． Servo motor for cutting, 23. ． ． Servo motor for movement, 3. ． ． Soft molding, 31. ． ． Individual pieces, 4. ． ． Cradle,

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-10-34639 (JP, A) JP-A-9-94793 (JP, A) JP-A-6-270092 (JP, A) JP-A-5- 228892 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B26D 1/46 501

Claims (8)

(57) [Claims] 1. A method of cutting an extruded soft molded body with a wire transverse to the extruding direction, wherein the wire disposed between a driving side bobbin and a driven side bobbin is wound up. When the wire is cut by the servo motor, the wire is cut in the lengthwise direction, and the servomotor for cutting is moved toward the soft molded body. The drive programs for the winding servomotor and the cutting servomotor are determined so that the combined tension acting on the wire during the cutting operation up to the following does not exceed the specified value. Is controlled to be less than the tensile strength of the wire, and the soft molded body is cut. The tension due to the moment of inertia of the driven side bobbin at the start of the running of the yarn, the tension due to the torque acting on the driven side bobbin, the tension due to the resistance caused by the friction between the wire and the soft molded body at the time of cutting, and the tension of the wire. A method for cutting a soft molded article, characterized in that the tension generated by cutting into the soft molded article is a tension acting on a synthesized wire. 2. The soft molded body according to claim 1, wherein:
A method for cutting a soft molded article, which is extruded into a honeycomb shape. 3. The method for cutting a soft molded article according to claim 1, wherein the running speed of the wire is 50 to 200 m / min. 4. The method according to claim 1, wherein
The method for cutting a soft molded article, wherein the wire has a diameter of 0.06 to 0.12 mm. 5. The method according to any one of claims 2 to 4,
A method for cutting a soft molded body, wherein the soft molded body is a honeycomb molded body having a wall thickness of 0.04 to 0.125 mm. 6. The method according to any one of claims 1 to 5,
A method for cutting a soft-molded article, wherein the torque acting on the driven side bobbin is a torque at the time of rising of a torque variable one-way clutch attached to the driven side bobbin and a torque at the time of steady running. 7. The method according to any one of claims 1 to 6,
A method for cutting a soft molded article, characterized in that the change in the acceleration of the traveling speed of the wire and the change in the acceleration of the moving speed in the cutting direction are temporarily changed. 8. The method according to any one of claims 1 to 7,
The above composite tension acting on the wire during the cutting operation is 1
A method for cutting a soft molded article, wherein the method is less than or equal to kgf.