JPS591531B2 - Method and device for manufacturing a product whose cross-sectional shape changes in the longitudinal direction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing a product whose cross-sectional shape changes gradually in the longitudinal direction.

In particular, an intermediate product having a continuous and periodic cross-sectional change in the longitudinal direction, such as a rectangular cross-section with the same width and gradually changing thickness, is formed by plastic deformation such as roll forming, and the intermediate product is placed in a predetermined position. This invention relates to a method and apparatus for cutting products into unit lengths.

Conventionally, a method is known for forming a long material whose cross-sectional shape changes along the length of the blade, and a method is also known for cutting a long material such as a thin plate whose cross-sectional shape does not change while it is being moved. ing.

However, there is still no known method for continuously forming a long material whose cross-sectional shape periodically changes gradually in the longitudinal direction and cutting it into precise desired dimensions to produce products of unit length.

This is because it is extremely difficult to precisely cut a long material with such a shape while running.

To further explain the difficulty of precision cutting of the above-mentioned materials, when the desired cutting length is one cycle of the intermediate product or its multiple, the reference point for cutting the intermediate product is set, for example. Even if you try to find it at the point where the plate thickness is the largest or the smallest, or at a point moved a certain distance from that point, there is no point to look at because the plate thickness changes extremely slowly, so it is difficult to find a clear reference point based on the external shape. Therefore, if you measure and cut a predetermined length from an unclear reference point, you will not be able to obtain the desired exact shape, and by repeating this cutting, A problem arises in that the errors accumulate and this tendency becomes even stronger.

In addition, since it is impossible to perform highly accurate cutting with 1-on-line cutting, which is performed on the forming line of a roll forming machine following the forming operation, ``off-line cutting'', which involves cutting at a location off the forming line, is recommended. However, it can be said that this method has achieved sufficient accuracy.
Moreover, it is extremely difficult to further improve accuracy.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art, and its gist is that a long material that is continuously moved in the longitudinal direction is processed by a roll forming machine to periodically change the cross-sectional shape of the material. An intermediate product that changes gradually is formed, and the moment the roll forming machine forms the part of the workpiece to be cut, the control device of the roll forming machine emits an electric signal to notify that, and the electric signal actuate a cutting device located at the rear of the forming machine with respect to the direction of movement of the material to be cut based on the electrical signal to cut the intermediate product during movement, or to cut the intermediate product at a desired cutting location based on the electrical signal. After making a mark, the intermediate product is cut at the position of the mark to produce a unit length product.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in more detail below based on the drawings.

In FIG. 1, reference numeral 1 denotes a workpiece, which is continuously moved in the direction indicated by arrow A.

On the upstream side of the flow of the workpiece 1, at least a pair of forming rolls (horizontal rolls in this example) 2, 2 are arranged.

The forming rolls 2, 2 are rotatably supported by a frame (not shown) and adjustable in roll position, and are rotated by a drive device (not shown).

The roll position is adjusted by a roll reduction device 31 including a reduction cylinder 14.

Further, downstream of the forming roll 2, there is a movement amount Nil device consisting of a detection roller 3 that is brought into contact with the workpiece 1 and rotates as the workpiece moves, and an encoder 4 that generates a pulse at each constant rotation angle. 5 is provided.

Furthermore, a cutting machine 6 (drum shear) is provided downstream of the movement measuring device 5, and a cutting blade 15 is fixed to a pair of opposing steel drums 9, and the cutting machine 6 (drum shear) performs cutting each time the drum rotates. A displacement measuring device 2 and a pinch roller 17 are provided downstream of the machine 6.

The roll gap between the forming rolls 2, 2 is controlled by a roll lowering device 31 based on a command from the main controller 7.

The main control device 7 includes a setting device 32, a control device 33, and a D/A converter 34, as shown in FIG.

The setting device 32 is set with a relational expression between the longitudinal position of the product and the thickness, which is represented by a graph as shown in FIG. 4, for example.

- Then, the control device 33 controls the workpiece 1 measured by the movement amount measuring device 5. That is, from the movement amount of the intermediate product and the relational expression set in the setting device 32, the roll gap of the roll forming machine corresponding to the movement amount that changes from time to time is calculated and output to the D/A converter 34.

The D/A converter 34 converts the digital signal from the control device 33 into an analog signal and outputs it to the roll lowering device 31.

The roll lowering device 31 includes a servo amplifier 35. Servo pulp 36. Reduction cylinder 14 and roll gap measuring device 37
including.

The roll gap measuring device 37 is connected to the rolling cylinder 1 shown in FIG.
It measures the roll gap between the forming rolls 2 and 2 controlled by the servo amplifier 3.
Supply to 5.

The servo amplifier 35 determines the difference between the actual roll gap and the target roll gap from the D/A converter 34, and supplies the servo pulp 36 with a control signal that brings this difference closer to zero.

As a result, the amount of hydraulic oil supplied from the servo pulp 36 to the reduction cylinder 14 shown in FIG. 1 is controlled, and the forming roll 2
．． The second roll gap is controlled by the control device 33 to be equal to the commanded target roll gap.

Through this control, the desired final product is formed into a Taber strip, which is an intermediate product continuous in the longitudinal direction.

The intermediate product formed as described above is cut at a desired location to produce a product of unit length. Control over cutting of this intermediate product will be described in detail.

Now, when attempting to cut an intermediate product at a desired cutting location, for example, at the midpoint of the minimum plate thickness range, the control device 3
3 outputs a roll gap control command corresponding to this cutting portion, that is, a target value of the roll gap corresponding to the position indicated by A in FIG. 4 to the roll lowering device 31 via the D/A converter 34 A cutting part shaping signal is instantly outputted to the cutting machine control device 8.

Based on this cutting part shaping signal, the cutting machine control device 8
The cutting machine 6, which is disposed a certain distance downstream from the roll forming machine 13, is controlled to cut the tapered strip material, which is an intermediate product.

The cutting machine 6 is controlled by the cutting machine control device 8 so that the cutting blade 15 moves at the same speed as the intermediate product and cuts the cut area. Explain.

A cutting condition setting device 41 is connected to the cutting machine control device 8 .

This setting device 41 can set the distance between the roll forming machine 13 and the cutting machine 6, as well as the length of the circle drawn by the cutting edge of the cutting blade 15 of the cutting device 6, and the setting device 41 cuts a digital signal indicating the difference between them. It is sent to the AND gate 42 of the machine control device 8.

This AND gate 42 is opened every time a cutting part shaping signal is sent from the control device 33, and each time the AND gate 42 is opened, the shaping machine 13-cutting machine 6 is opened.
The difference between the distance therebetween and the cutting edge circumference of the cutting blade 15 is written into the error register 43.

The error register 43 is further supplied with pulse signals from the movement amount measuring device 56 and the blade position detecting device 10.

The error register 43 decrements the stored content by 1 each time one pulse is supplied from the movement amount measuring device 5, and increases the stored content by 1 each time one pulse is supplied from the blade position detection device 10. It has been configured.

Therefore, the contents of the error register 43 represent the momentary error between the position of the cutting part of the intermediate product and the position of the cutting edge of the cutting blade 15.

A digital signal representing this error is converted into an analog signal by a D/A converter 44 and supplied to a differential amplifier 45 .

The operational amplifier 45 is also supplied with the pulse signal from the movement amount measuring device 5 that has been converted into an analog signal by the F/V converter 46, and the operational amplifier 45 receives the output of the error register 43 based on these signals. A signal suitable for quickly reducing the speed to zero is supplied to the speed regulator 47.

The speed regulator 47 controls the drive device 1 based on this signal.
The rotational speed of the DC motor, which is the driving source of the motor 1, is detected by the tacho generator 16 and fed back to the speed regulator 47.

In this way, the cutting blade 15 of the cutting machine 6 is controlled to cut the intermediate product while moving at the same speed as the cutting part.

The cutting machine 6 is stopped by cutting off the power supply to the DC motor of the drive device 11 when a detector (not shown) detects that the cutting blade 15 has rotated by a certain small angle after cutting the intermediate product. However, the roll forming machine 1
When the main control device 7 of No. 3 issues a cutting portion shaping signal again, the above control cycle is started and cutting is performed in the same manner.

By repeating this process, the intermediate product is cut into multiple pieces to form the final product.

In this way, even for a long material whose cross-sectional shape changes very slowly periodically in the longitudinal direction, a clear reference point for cutting, that is, the output point of the forming signal when forming the cut portion, is set as the reference point, and from this point onwards. By measuring the amount of movement, the exact cutting position can be determined.

Therefore, it is possible to cut the workpiece at a desired position extremely accurately, and since the error register 43 is reset periodically, a new measurement is started every time from the output of the cutting part shaping signal, and cutting is continued. By repeating this process, there is no cumulative error in the product.

Note that the movement amount measuring device 12 and the pinch roller 17 are
When cutting the final cut portion of the intermediate product 21, even when the intermediate product 21 becomes short and short and no longer contacts the forming roll 2 and the movement amount measuring device 5, the intermediate product 21 is still moved and the amount of movement is reduced. This is for measuring purposes, so that it is possible to make every last piece of intermediate product into a finished product.

Next, another embodiment of the present invention will be described based on the drawings.

One of the apparatuses of this embodiment is obtained by removing the cutting machine 6 from the apparatus shown in FIG. This is a device in which a marking control device 8' is provided instead of the marking control device 8', and the intermediate product 21 is processed by this device.
A mark K can be placed at the desired cutting site.

The work up to this mark imprinting step is usually done hot.

The device shown in FIG. 2 is a device that accurately cuts an intermediate product 21 with a mark K from the mark position to form a desired single product, and is usually cold cut, in other words, the intermediate product 21 with a mark K is cut into a desired single product. The work is carried out on a separate line separate from the flow of the workpiece 1.

Here, the marking tool 15' and the mark K may be a streak made by a knife, a dent made by a punch, or a paint line.

Further, the marking device 6' may have a structure similar to the drum shear shown in FIG. 1, or may be any other device that instantly makes a mark.

Furthermore, the marking device 6' is preferably of a type (flying type) that marks the workpiece 1 while moving at the same speed as the workpiece 1, but since marking is an instantaneous engraving operation, There is no problem even if the device is fixed in position.

Note that the movement amount measuring device 12 and the pinch row 217 continue to move the intermediate product even when the intermediate product 21 is no longer in contact with the forming roll 2 and the movement amount measuring device 5, as in the case of cutting the intermediate product described above. This is for marking, and this makes it possible to mark every last piece of intermediate product.

This intermediate product 21 is then passed through the device shown in FIG.
The cutter 25 is continuously moved in the direction indicated by arrow A, and the amount of movement is measured by a movement amount measuring device 23, which is also provided on the upstream side of the cutting machine 25.

Furthermore, on the flow side of the movement amount measuring device 23, there is a mark detector 24 such as a photoelectric type that projects light onto the surface of the intermediate product and detects the mark by changing the amount of reflected light due to the presence of the mark.
A known cutter 25 such as a pensula jar is disposed below the ffi side, and a movement measuring device 26 and a pinch roller 27 are further disposed downstream thereof.

In such a configuration, the intermediate product 21 is sent out by the pinch roller 22, and when the mark portion thereof passes the mark detector 24, the mark detector 24 issues a mark passing signal.

Based on the movement amount measurement result by the movement amount measuring device 23 and the position detection result of the blade position detection device 29 of the cutting machine 25 after the moment of transmission of this signal, the cutting machine control device 28 determines whether the cutting blade is in the intermediate position at the time of cutting. The drive device (motor M, speed reducer R1, speed reducer R2 driven by this, etc.) of the cutter 25 is controlled so as to cut the cut portion while moving at the same speed as the product 21.

Note that the movement amount measuring device 26 and the pinch roller 27 are
When cutting the last cutting part of the intermediate product 21, the intermediate product 2
Even when the intermediate product 21 becomes too short and no longer contacts the pinch roller 22 and the movement measuring device 23, the intermediate product 21
This is to move and measure the length of the product, thereby making it possible to make every last piece into a product.

Further, such cold cutting has the unique effect that, compared to hot cutting, there is less deformation of the cut portion, and a product with accurate dimensions and a high commercial price can be obtained.

In the two embodiments described above, rolling in the thickness direction using one set of horizontal rolls was explained, but the present invention is not necessarily limited to this. For example, rolling in the width direction using two sets of vertical and horizontal rolls is explained. It may be rolled in the thickness direction, or it may be pultrusion or extrusion molding using one or two sets of roller dies, or it may be formed using cam-controlled rolls. .

In this specification, the term "roll forming machine" is a general term for equipment that performs these operations.

Furthermore, in the second embodiment, it was explained that the work up to marking the mark K on the workpiece is done hot and the cutting work is done cold, but it is possible to carry out continuous hot or cold work up to the final process. Of course, it is also possible.

Further, the cutting machine may be automatic or manual.

Furthermore, the movement amount measuring devices 5, 12, 23, and 26 can be non-contact type devices using image sensors or the like, and various other components can be used without departing from the spirit of the present invention. Alternative measures may be adopted.

As detailed above, in manufacturing a product whose cross-sectional shape changes in the longitudinal direction, the present invention first forms a continuous long intermediate product of the desired product using a roll forming machine, and then molds the product. The intermediate product is cut into the desired product based on the instructions of the device itself that controls the roll forming machine, so the desired product can be formed continuously and efficiently. This has the excellent effect of making it possible to always cut at accurate positions without fear of cumulative errors and to manufacture products with extremely high precision at low cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the first embodiment of the present invention, and the second embodiment is an explanatory diagram showing the first embodiment of the invention.
The figure is also an explanatory diagram showing the second embodiment. FIG. 3 is a block diagram showing details of the main control device and roll lowering device in the apparatus shown in FIG. 1. FIG. 4 is a graph showing an example of the relational expression to be set in the setting device of FIG. FIG. 5 is a block diagram showing details of the cutting machine control device in FIG. 1. 1: Workpiece material, 2: Forming roll, 3: Detection roller, 4:
Encoder, 5, 12, 23.26: Travel amount measuring device, 6, 25: Cutting machine, 6': Marking device, 7: Main control device, 8.28: Cutting machine control device, 8': Marking control device, 9: Steel drum, 10.29: Blade position detection device, 11: Drive device, 13: Roll forming machine, 14: Reduction cylinder, 15: Cutting blade, 21: Intermediate product, 15':
Marking tool, 17, 22.27: Pinch roller, 16
: Tacho generator, 18: Cutting conditions, 24: Mark detector, 31: Roll lowering device, K: Mark, M: Motor, R1, R2: Reducer.

Claims (1)

[Claims] 1. Forming an intermediate product whose cross-sectional shape periodically changes gradually in the longitudinal direction by continuously moving a long material in the longitudinal direction and periodically changing the gap between the rolls of a roll forming machine. The control device of the roll forming machine generates an electric signal instructing the cutting part based on a control command for the gap between the rolls of the roll forming machine, and based on the electric signal, the control device of the roll forming machine generates an electric signal instructing the cutting part in the direction of movement of the workpiece. A process of activating a cutting device disposed at the rear of the roll forming machine to cut the workpiece while it is moving to produce a product of unit length. How products are manufactured is changing. 2. Forming an intermediate product whose cross-sectional shape periodically changes gradually in the longitudinal direction by periodically changing the gap between the rolls of a roll forming machine while continuously moving the long material in the longitudinal direction, and the roll forming. A control device of the machine generates an electric signal instructing the cutting part based on a control signal for the roll gap of the roll forming machine, and based on the electric signal, a control signal is generated at the rear of the roll forming machine with respect to the moving direction of the workpiece. A marking step of activating a disposed marking device to mark the cut portion of the moving workpiece; and a step of making the workpiece a product with a long cut portion at the mark position. A method for manufacturing a product whose cross-sectional shape changes in the longitudinal direction. 3(a) a forming machine having at least a pair of forming rolls disposed on the upstream side of the flow of the workpiece and a roll reduction device that changes the roll gap between the forming rolls; and (b) at least the roll forming machine. (c) a movement amount measuring device disposed on the exit side of the workpiece to measure the amount of movement of the workpiece; A target value for the gap is determined, and it is commanded to the roll lowering device of the roll forming machine, and at the moment when it is commanded to form a predetermined cutting part of the material to be subjected to stress, a cutting part forming signal is sent. (d) a cutting machine disposed downstream of the roll forming machine and equipped with a cutting blade that is driven by a drive device and cuts the workpiece while moving in the movement direction of the workpiece; (e) a blade position detection device that detects the ever-changing position of the cutting blade of the cutting machine; (f) a blade position detection device that detects the constantly changing position of the cutting blade of the cutting machine; and (f) a blade position detection device that detects the position of the cutting blade of the cutting machine; Based on the movement amount measurement result of the workpiece and the position detection result of the cutting blade by the blade position detection device, when the cut portion of the workpiece passes through the cutting machine, the cutting blade of the cutting machine detects the position of the cutting blade. and a cutting machine control device that controls the drive device of the cutting machine so as to cut the cut portion while moving at the same speed as the workpiece, manufacturing a product whose cross-sectional shape changes in the longitudinal direction. Device. 4. The apparatus for manufacturing a product whose cross-sectional shape changes in the longitudinal direction according to claim 3, wherein the movement amount measuring device is disposed on the exit side of the roll forming machine and on the downstream side of the cutting machine. 5(a) a roll forming machine having at least a pair of forming rolls disposed upstream of the flow of the workpiece and a roll reduction device for changing the roll gap between the forming rolls; and (b) at least the roll forming machine. (e) a movement amount measuring device disposed on the exit side of the workpiece to measure the amount of movement of the workpiece; A target amount of gap is determined, and it is commanded to the roll lowering device of the roll forming machine, and a cutting part forming signal is issued at the moment when a command is given to form a predetermined cutting part of the workpiece. (d) a marking device disposed downstream of the roll forming machine and equipped with a marking tool for marking a workpiece; (e) the main control device receiving the cut portion forming signal; Based on the result of the movement amount = ti+ of the workpiece by the movement amount measuring device after the moment when the workpiece is cut, when the cut portion of the workpiece passes the marking device, the marking tool of the marking device will move the marking tool of the marking device to the cut portion. (f) a reading device that reads the mark attached to the workpiece (ω) that controls the operation of the marking device so as to mark the workpiece; An apparatus for manufacturing a product whose cross-sectional shape changes in the longitudinal direction, comprising: a cutting machine that cuts a cut portion; and 6. An apparatus for manufacturing a product whose cross-sectional shape changes in the longitudinal direction. An apparatus for manufacturing a product whose cross-sectional shape changes in the longitudinal direction according to claim 5, which is disposed in the apparatus.