JPH05506190A - Method and cutting machine for detecting the quality of the cut edge of a cutting machine for paper manufacturing, paperboard, etc. - Google Patents

Abstract

A process is disclosed for determining the quality of the cut made by a machine for cutting paper, cardboard or the like. The cutting machine has a wedge-shaped cutting knife (12) arranged in a knife-holder (10) with which a pile of goods to be cut can be severed. In order to improve the process by automatically evaluating essential cutting parameters, the operating force to be applied for severing the pile of goods to be cut after the cutting knife is laid on the pile of goods to be cut and/or a deflection acting on the cutting knife (12) or the knife-holder (10) are detected and evaluated.

Description

[Detailed description of the invention] Method and cutting machine for detecting the quality of the cut edge of a cutting machine for paper manufacturing, paperboard, etc. The present invention is based on the preamble of claim 1, and provides a cutting machine for paper making, paperboard, etc. The present invention relates to a method for detecting the condition of the vehicle.

At the bookbinding plant, paper, paperboard, etc. are cut. For example, it is divided with a smooth cut by a guillotine cutting machine or a three-sided cutting machine. Ru. In this case, the quality of the cut determines the quality and dimensional stability of the final product. Ru. When the cut quality is poor, the final product is often no longer usable. All previous processing will be undone and much damage will result.

In the past, the quality of the cut of the workpiece sent in for one cut was sometimes determined by the worker. If the quality of the cut deteriorates, appropriate adjustments and maintenance are carried out. Measures have been taken.

In other words, in consideration of the worst case, the above measures should be taken every certain time or every certain number of cuts. It was taught.

However, this is uneconomical. This is because, firstly, the quality of the cut is insufficient. This is because a significant portion of the cut paper becomes unusable before it is detected. Second, it generates downtime and maintenance costs that are not always necessary.

Therefore, the problem of the present invention is to automatically calculate basic cutting parameters. Therefore, it is necessary to improve the method for detecting the quality of the cut end of the cutting machine.

In the case of the method described in the preamble of claim 1, the above problem is solved by the parameter The angle of the slope of the object, the sharpness, the thickness of the stack, the stacking The compressive force applied to the stacked objects to be cut, the fiber direction and cutting length of the objects to be cut (Schn fttlaenge). Cutting parameters that change during machining of the workpiece are It has a delicious taste.

Sharpness constantly deteriorates due to wear, which is why it is necessary to cut stacked objects. As the operating force increases, the deflection that occurs in the cutting blade increases.

Therefore, the above operating force and deflection that must be applied are the criteria for determining the quality of sharpness. In order to form a standard and judge the quality of the cut, one of the above operating force and deflection or Both are automatically calculated.

Preferably, the operating force is detected by extension or contraction of the operating rod.

For cutting action, a resultant force must be applied that exceeds the cutting resistance, and the cutting resistance A change in is uniquely shown as a change in the value of the operating force. According to the operating rod, the number Based on the geometric shape, the above elongation and contraction are maximized, allowing for highly accurate detection. It is done.

Preferably, the deflection is detected as a surface extension on the surface of the cutting knife or knife holder. stomach.

That is, when the thickness of the deflected object eventually changes, the surface is stretched on one side. This is to take into account the phenomenon that one side is compressed while the other side is compressed.

By calculating the operating force, the value obtained after contact and before cutting can be used to determine the thickness of the stack. It is compared with a target value determined by the cutting speed and the object to be cut.

The value measured at this point overcomes the cutting resistance after compression of the stacked material to be cut Represents the operating force that needs to be applied to When measuring with a sharp cutting tool, Add some value to the measured value, taking into account the thickness of the overlap and the type of workpiece, and compare it with the target value. The nominal resistance value to be used is determined. If the actual value deviates from the target value, turn it off. It is determined that the cutting parameters are inappropriate values, especially that the sharpness has deteriorated. be done.

Further, it is preferable that a knife change signal be transmitted when the actual value exceeds the target value.

The signal optically or acoustically instructs and warns the worker to change the knife. If the cutter is not replaced after a certain period of time, the cutting machine is stopped.

When calculating the operating force, instead of or in addition to the calculation, the time of the value generated after contact The intermediate progress is determined according to the target progress determined according to the stack thickness and the type of material to be cut. You can compare.

The time course of the operating force provides information about the elasticity of the stacked objects to be cut. elasticity If it is too high, the cutting tool may be held in place by a wedge, or the upper layer of the material to be cut may This results in a diagonal cut.

If the time course of the value is lower than the desired course, cut the stacked workpieces. an increase in compressive force to or a signal is sent to reduce the stack thickness. It is preferable.

This allows the elasticity of the stacked materials to be automatically or manually adjusted to ensure a good cut. can be changed to a value that guarantees the quality of the work.

By calculating the deflection, the values obtained after abutment and before cutting are determined by the thickness of the stack and It can be compared with a target value determined depending on the type of object to be cut.

If the deflection of the cutting blade is too high, the dimensional stability of the paper will be insufficient. Poor sharpness In addition to lowering, the compressive force on the stacked objects to be cut is too high, or the Excessive thickness of the ribs causes deflection. A detailed diagnosis of the cause is This is facilitated by measuring both the operating force and deflection.

When the actual value exceeds the target value, the compressive force on the stacked workpieces is reduced. or after a reduction in the compressive force a signal is emitted to reduce the stack thickness, or After the stack thickness has been reduced, the blade change signal is issued.

As mentioned above, first, the cutting parameters are automatically varied to optimize the quality of the cut. It becomes possible to make it suitable. If this does not work, other causes are explored. . This search is carried out by discovering many causes and rejecting them. be called.

The invention also relates to a cutting machine for papermaking, paperboard, etc. according to the preamble of claim 10.

The problem of the present invention is to automatically check the quality of the cut edges of the cutting machine using basic cutting parameters. The goal is to improve the cutting machine so that it can make decisions based on accurate measurements.

The above problem is stated in the characteristic part of the cutting machine based on the prerequisite part of claim 10. This will be resolved through the measures taken.

The present invention eliminates sharpness, which is one of the basic cutting parameters, due to wear. The operating force required to cut the stacked objects increases, and the cutting tool The phenomenon of increasing deflection is utilized.

Therefore, the applied operating force or the deflection of the cutting blade and therefore the holder of the cutting blade can be detected. The sensor provides a value for determining the quality of the cut. this place In this case, measurements from only one of the two sensors are sufficient. However, the measurement of two sensors A fixed value may also be used. In the latter case, furthermore, other cutting parameters, e.g. The angle of the slope of the blade, the thickness of the stack, or the compressive force on the stacked objects to be cut. Measured values can also be used.

In the actual structure, the operating force sensor is installed on the operating rod.

In this case, the resultant force for overcoming the cutting resistance is particularly Acts as a large change in operating force.

Measurements of the elongation and compression values in this part are therefore carried out with high precision.

A bending sensor is placed on the surface of the cutting blade and therefore of the blade holder, preferably in the central area of the cutting blade. The purpose is to have an extension on one side and an extension on the opposite side of the surface. compression occurs.

These are largest in the central area of the cutting blade and therefore the blade holder, so the measurements here Accuracy is the best.

In practical implementation, the sensor is formed as an elongated measuring strip.

Elongation measuring strips are extremely sturdy and reliable for measuring tensile or compressive forces from the elongation of materials. It has already been shown that it is a highly sensitive sensor. In the case of the cutting machine according to the invention , the small size of the elongation measuring piece and the interference with the cutting function by the elongation measuring piece. It is shown that it is particularly preferable that the

Preferably, the detection and calculation device is connected to a signal transmitter.

This allows the blade change signal to be sent when the operating force is calculated. The value that occurs after contact and before cutting depends on the thickness of the stack and the type of material to be cut. It is also possible to stop at a set target value.

Furthermore, the detection and calculation device can be connected to a compression force control device.

In the device of the present invention, the compressive force on the stacked objects to be cut is automatically increased. , when calculating the operating force, consider the time lapse that occurs after contact and before cutting the operating force value. , when the value is lower than the target value determined by the thickness of the stack and the type of material to be cut. Immediately after taking an interim course. In other words, this process is based on an elastic cumulative covering. It shows the elasticity of the cut object, and the elastic cut object will adjust accordingly based on the increase in compressive force. The stacked workpieces are automatically removed and compressed through the compression force control device. force can be reduced.

This measure is necessary when calculating the deflection after contact with the object to be cut and before cutting. The value of the deflection caused by the This is the case when the value is exceeded. The effect of this measure is that the measured deflection continues to decrease. You can know by knowing what you are doing.

If the above measures do not reduce the deflection, a signal is sent to reduce the stack thickness. The transmission is based on an improved configuration of the detection and calculation device and the signal transmitter.

In this case, the thickness of the subsequent stack of workpieces can be reduced manually or automatically. If this is the cause of too strong a deflection, the deflection will continue to decrease. It will be done.

If the above measures are unsuccessful, the detection/calculation device then sends the signal via the signal transmitter. Then, a knife change signal is sent out. In this case, only the insufficient sharpness is the result of insufficient cutting. The inconvenience can be removed by replacing the blade. It will be destroyed.

Improvements and advantageous constructions of the invention are apparent from the claims, the description and the drawings of the invention. That's it.

Figure 1 is a diagram showing the course of cutting force, and Figure 2 is a diagram showing the course of deflection. Figure 3 is a plan view of the cutting blade installed in the blade holder, and Figure 4 is a diagram of the cutting blade installed in the blade holder. FIG. 3 is a cross-sectional view of the diagram based on FIG.

FIG. Therefore, a diagram depicting the course of the cutting force that needs to be applied is shown. cutting force When considered qualitatively, the process is almost the same for any object to be cut.

The start of the cutting process is already before point A in FIG. 1 in terms of time. From the start point to the point in time During the period up to A, the object to be cut is pre-compressed by the compression means.

Next, at time A, the cutting blade drive device is activated. Next, the cutting knife is placed in the starting position. Move from the machine to the stacked objects to be cut.

At time B, the inclined surface of the blade comes into contact with the stacked objects to be cut.

The object to be cut is deformed and compressed in the area of action by the knife.

As a result, the operating force increases significantly in the region between points B and C, and this interval In this region, the hardness required for the actual cutting process is obtained.

At point C, the cutting force overcomes the resistance of the object to be cut and the actual cutting process begins.

In the region between points C and D, the individual layers of the object to be cut are separated and the cutting force is initially following a decrease in , it increases again. The course of this curve area varies depending on the object to be cut. Become.

The point is reached after cutting the last layer.

The increase in force in the region between point and E causes the inclined surface of the blade to enter the cutting ridge. caused by the cutting edge being made of soft material and cutting in the cutting area. It is fitted into the underlayment.

The maximum force at point E is determined by the depth of penetration of the cutting edge into the cutting ridge. .

At the subsequent time point F, the cutting force assumes its lowest value, after which it reaches a position corresponding to the starting point. Return to G.

, the cutting force gradually increases at time C. From this progress chart, you can see how well the cut is made. is still fully satisfactory and can be used as a target value for subsequent comparative measurements. The value to be used can be determined. In this case, exceeding the target value indicates insufficient sharpness. In this case, a knife change signal is sent.

Another parameter, namely the compressive force on the object to be cut, can be read from the course of the curve.

For example, if the compression force is adjusted correctly, the stack of workpieces will be pre-compacted. Given that, between time points B and C, a characteristic sharply rising curve shape occurs. Ru. This curve shape is also stored as a target value.

Deviations from this curved shape, such as a low or dramatically changing course, result in elasticity. It is possible to estimate the spring of the object to be cut. Correct signal by comparison with target value is generated, and the correction signal automatically increases the compressive force on the stacked workpieces. If the situation has been affected and no improvement can be made due to this, a warning is indicated. this diamond Gram is the value of the blade when the blade is applied to the workpiece that is 100% stacked. The bending of the holder clearly shows the progress, and the lower part of the figure shows the cuts related to curves A to E. A table showing cutting parameters is arranged.

In this figure, sharpness is not listed as a variable parameter, but again, The dependency between sharpness and the above-mentioned deflection is clear.

Other influences on deflection were confirmed. For example, a knife holder or cutting blade Deflection is caused by pressing the object against the object to be cut. The object to be cut is When compressed to . On the other hand, during normal cutting, the cutting blade uses the reaction force of the object to be cut in front of it. It's only a slight deviation.

Furthermore, a dependence on the compaction of the cut object and the thickness of the stack was observed. In contrast to this The figure shows several examples. For example, songs! As the comparison of IA, C and D shows, the pressure If the compression force is small, use a small deflection value of the cutting tool or tool holder. A value calculation is performed.

As the comparison of curves A and B shows, when the stack thickness is small, the cutting blade The deflection of the object or knife holder is likewise slight.

A lack of sharpness is indicated based on the deflection of the cutting knife or knife holder, and The compression force on the stacked objects to be cut is controlled or the thickness of the stack is controlled. Up In a series of experiments for this control, a target value was determined corresponding to the maximum deflection. , the actual deflection measured during operation is compared to the target value.

When the actual measured value exceeds the target value, the workpieces to be cut are stacked under pressure. The compressive forces generated in the process are reduced. If this measure is not successful, the stack thickness is reduced. If this measure is also unsuccessful, a knife change signal is issued. why If so, a possible cause in that case is that the angle of the slope of the blade is inappropriate. This is because it is assumed that

FIG. 3 shows a plan view of the cutting blade 12 attached to the blade holder 10. knife holder The cutting blade 12 equipped with the blade 10 is a component of a guillotine cutting machine, and the guillotine During the cutting process, the cutter has a vertical motion in the horizontal direction and a vertical motion superimposed on this motion. Gives directional motion. The superimposed movements are caused by the blade of the operating device, which is not shown in detail. It is generated by the operating rod 18 connected to the holder and its side.

The operating rod 18 is provided with an operating force sensor 14 which is designed as an elongated measuring piece. ing. The electrical signal from the elongated measurement piece is sent to a detection/calculation device (not shown).

By means of the operating force sensor 14, the course of the cutting force can be determined by the operating force sensor 14, as illustrated in FIG. is recorded based on the elongation or compression of the card 18 and is calculated as described above.

Furthermore, a bending sensor 16 is installed on the cutting blade 12 or the blade holder 10.

The bending sensor 16 detects the elongation or Deflection of the cutting blade 12 or blade holder 10 is detected via compression. bending sensor 16 is provided in the intermediate region of the cutting blade 12 or the blade holder 10, and the bending is the maximum, so the measurement accuracy is the highest.

The bending sensor 16 is also designed as an elongated measuring piece and, like the actuating force sensor, is Connected to a detection/calculation device that does not exist. The bending sensor 16 detects the bending as shown in FIG. Recorded as shown and calculated as described above.

FIG. 4 is a cross-sectional view of FIG. 3 shown for complete understanding, and shows the bending sensor 16. The location is clearly indicated.

Summary book A method for detecting the quality of the cut edges of cutting machines for paper making, paperboard, etc. In the method, a wedge-shaped cutter is attached to the cutter holder (10) and is used to cut stacked objects. A cutting tool (12) is used, and the method for detecting the quality of the cut is based on the basics necessary for cutting. This is done by changing the fundamental parameter to an appropriate value, and the parameter After placing the cutting blade (12) on the object to be cut, and after cutting the object. force applied to the cutting blade (12) or the blade holder (10) when It is determined based on the result of automatically calculating the deflection.

international search report international search report 0 shots clear by Buffifer, Olaf, Federal Republic of Germany, 3000 no 1 no No <-1, Jordan Strasse

Claims (19)

[Claims] 1. The wedge-shaped cutting blade installed in the blade holder cuts the stacked objects. In the method of inspecting the quality of the cut edges of paper cutting machines, paperboard cutting machines, etc. After touching the blade of the knife to the stacked objects to be cut, and cutting the stacked objects to be cut. Check the operating force and/or deflection acting on the cutting tool or tool holder when A method characterized by calculating the output. 2. The operating force consisting of extension and compression force is based on the extension or compression of the operating rod. 2. The method of claim 1, further comprising: detecting. 3. Detecting the deflection as a surface elongation on the surface of the cutting blade or blade holder; The method according to claim 1 or 2, characterized in that: 4. When calculating the operating force, the value that occurs after contact and before the cutting operation is The request is characterized in that it is compared with a target value determined by the thickness and type of the object to be cut. The method described in claim 2. 5. Claim 4, characterized in that when the daily target value is exceeded, a knife replacement signal is transmitted. Method described. 6. When calculating the operating force, the time of the value generated on the operating rod after contact with the object to be cut is Compare the progress with the target progress determined by the stack thickness and type of material to be cut. The method according to claim 2, characterized in that. 7. If the time course of the value as the target course occupies a low position, the said stacking increasing the compressive force on the object to be cut or transmitting a stack thickness reduction signal; 7. The method according to claim 6, characterized in that: 8. When calculating the deflection, the value obtained after contact and before cutting is used based on the thickness of the stack and the object to be cut. according to claim 3, characterized in that the comparison is made with a target value determined depending on the type of Method. 9. If the target value is exceeded, the compressive force on the stacked objects to be cut is reduced or sends a stack thickness reduction signal after the compression force decreases, or the stack thickness decreases. 9. The method according to claim 8, further comprising subsequently issuing a knife change signal. 10. A wedge-shaped cutting blade (12) provided on the blade holder (10) and the blade holder A cutting machine for paper making, paperboard, etc., which has an operating device (14) that acts on a folder (10). In this case, the operating device (14) includes an operating force sensor (16) and/or a cutting blade (1 2), or the blade holder (10) has a bending sensor (18). and one or more sensors (16, 18) are detection and calculation devices. A cutting machine characterized by being connected to. 11. The operation sensor (16) is provided on the operation rod (20). The cutting machine according to claim 10. 12. The bending sensor (18) is connected to the cutting blade (12) or the blade holder (1). 0) The cutting according to claim 10 or 11, characterized in that the cutting is provided on the surface of Machine. 13. The bending sensor (18) is connected to the cutting blade (12) or the blade holder (1). 13. The cutting machine according to claim 12, wherein the cutting machine is provided in the central area of 0). . 14. Particularly, the sensors (16, 18) are designed as elongated measuring strips. The cutting machine according to any one of claims 10 to 13, wherein the cutting machine is characterized by: 15. The detection/calculation device is connected to a signal transmission device, and the signal transmission device is operable. When calculating the force, the value of the operating force that occurs after contact and before cutting is determined based on the stack thickness and As soon as the daily target value determined by the type of material to be cut is exceeded, a blade change signal is sent. The cutting machine according to any one of claims 10 to 14, characterized in that: 16. The detection/calculation device is connected to a compression force control device, and the compression force control device includes: When calculating the operating force, the time course of the operating force value that occurs after contact is As soon as the time elapsed is lower than the target value determined by the thickness and type of material to be cut, Rather, the claim is characterized in that the compressive force on the stacked objects to be cut can be increased. The cutting machine according to any one of items 10 to 15. 17. When calculating deflection, the value of deflection that occurs after contact and before cutting is calculated based on the stack thickness. As soon as the target value determined by the cutting speed and the type of workpiece is exceeded, the The compressive force control device reduces the compressive force applied to the stacked objects to be cut. The cutting machine according to any one of claims 10 to 16, characterized by: 18. When the compressive force is reduced, the value of the deflection that occurs after contact and before cutting is the As long as the target value determined by the thickness and type of the cut object is further exceeded, the detection and calculation described above will continue. The output device is characterized in that the signal transmission device transmits a stack thickness reduction signal. The cutting machine according to claim 17. 19. Even when the thickness of the stack is reduced, the value of the deflection that occurs after contact and before cutting is As long as the target value determined by the thickness of the stack and the type of workpiece is exceeded, the detection ・The calculation device is characterized by transmitting a knife exchange signal using a signal transmission device. The cutting machine according to claim 18.