JP3283033B2 - Punch press with correction values for press-fit depth and extrusion length - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a punch press to which a correction value of a press-fit depth or an extrusion length is input.

[Conventional technology]

In the punch press, when the parameters of the punch press operation such as the number of piston strokes, tools (punches, dies), and workpieces change, deviation from a preset reference value always occurs. Fluctuations in the number of piston strokes have an effect such as changing the inertia force. For example, the inertia force changes so as to increase as the stroke number increases. It causes small elastic changes in the dimensions of the moving part of the punch press and also changes in the play or clearance in the bearing as well as in the end punch height of the tool and the individual press-in depth of the tools. .
Different tools having different masses also cause different inertial forces during operation. In some cases, in combination with the inertial force described above, a deviation from the input reference value is caused. In particular, with respect to the indentation depth, for example, the properties of the workpiece to be processed, such as the metallurgical properties of the machine itself, greatly influence the shape of the product to be processed.

Deviation from the reference value also occurs in extrusion adjustment,
As a result, the size of the extrusion length deviates from the reference value input at that time. In this case, the increasing number of piston strokes and the mass of the material further accelerate the error.

West German Patent No. 2731084 describes a punch press in which the punch press contains a control device, the press-in depth of the punch or the tool of which is respectively adjusted during operation of the press. A reference characteristic curve representing the press-fit depth according to the number of strokes per minute of the punch press is set in the above-described control device. This characteristic curve is accepted as a reference value. The indentation depth value is measured and compared to its reference value.
If there is a deviation from the measured value, adjustment to the reference value is performed by the control device.

In operation of the punch press, the press-fit depth is compared with a reference value by a sensor, the press-fit depth is changed and corrected by a spindle for the deviation, and the correction value is stored in the control device. However, once this correction has been made, especially when operating over the entire piston stroke range, the correction value will vary substantially despite changes in stroke number, especially since no further changes can be made during operation. Without
The correction curve simply extends parallel to the characteristic curve. Thus, it is certain that the West German punches in practical operation often do not produce any satisfactory results over the entire range of piston stroke numbers. It is therefore more desirable that punch press products can be manufactured with a higher degree of precision.

[Problems to be solved by the invention]

Therefore, an object of the present invention is to provide a punch press which does not have the above-mentioned disadvantages and can produce a product having desired accuracy in the entire range of the number of strokes. Another object of the present invention is to provide a control device including input means capable of inputting a value of a press-in depth deviating from a reference characteristic curve even during operation at an arbitrary number of strokes. The object of the invention is to provide a punch press designed to produce a signal whose input value is adjusted by the number of piston strokes and which is added to the reference characteristic curve. Still another object of the present invention is to provide a control device including an input means for inputting a value of the extrusion length deviating from the reference characteristic curve at an arbitrary stroke number, wherein the control device has an input value according to the piston stroke number. Adjusted,
It is an object of the present invention to provide a punch press designed to produce a signal added to the reference characteristic curve.

As mentioned above, the subject of the present invention is basically the same for the extrusion length of the material to be punched. This problem is solved by the same inventive concept as the extrusion of various punch presses mentioned in the second, the control device has an input means, and can input a deviation value from the reference characteristic curve of the extrusion length at an arbitrary stroke number, The control device is to provide a punch press formed so that an input value can be changed according to the number of strokes to output a signal and can be added to a reference characteristic curve.

[Means for solving the problem]

The present invention relates to a punch press having the requirements set forth in claim 1, and in particular, the punch press includes a piston stroke number adjusting device and a control device into which a reference characteristic curve is input, and the control device includes an optional device. An input device capable of storing at least one input value for inputting a correction value for a press-fit depth deviating from the reference characteristic curve at the number of strokes, and the control device that emits the signal,
The input value is adjusted according to the number of strokes and contains a characteristic value for the punch tool used, which is added to the input value, and the characteristic value is designed to be added to the reference characteristic curve. There are features.

According to the punch press designed according to the present invention, the punch material can be precisely finished in the entire region of the number of strokes. If, as is generally known, the punch press increases by a set number of strokes from a lower number of strokes, for example 100 strokes / min, to a desired high number of strokes along a tool-specific reference characteristic curve. The error of the press-in depth at high stroke numbers is evident and can be seen in the punched product. By entering a single value as the press-fit depth correction, errors at normal stroke numbers are significantly reduced. The control system is based on the predetermined reference characteristic curve itself. When the number of strokes further changes, a new set value is created in the control unit. Thereby, the input value changes from device to device and is used for the reference characteristic curve for setting the press-in depth suitable for the new number of strokes. The method for changing the reference value of the extrusion length is the same as the above method.

Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings. FIGS. 1 to 4 are simplified explanatory diagrams showing the most important operation parts of the punch press in order to facilitate understanding of the present invention. FIG. 5 is a schematic view of a conventionally known control device. FIG. 6 is an explanatory diagram of an example of the control device of the present invention, and FIG. 7 is a characteristic curve illustrating the operation of the control device of FIG.

First, with reference to FIGS. 1 to 4 which show simplified essential parts of a punch press necessary for understanding the present invention, problems concerning the press-fit depth will be described below. As shown in the figure, the most important members of the punch press are a crank arm 1, lever (lever) 2, adjustment spindle 3, piston rod 4, ram (punch) 5, and pan 6. WSH means a so-called height at the end of punching. Furthermore, each of the male deflection F and the play S is shown schematically and corresponding to the usual individual special condition in which the operation is taking place.

FIG. 1 shows a press in the operating state with 100 strokes / min and no tools. In that case, the various bearings 7 are depicted as journal bearings, with the play present in these bearings being shown too large. Therefore, all the components, in particular, levers 2 acting as rigid structural members
Is not distorted downward. The relative position of the trunnion (ear shaft) and the bearing cylinder, that is, the state of play or clearance of the bearing,
It depends on the weight of the ram 5, i.e., exactly. It is clear that the entire structure is pulled down by the ram 5. The height WSH at the end of punching corresponds to a predetermined reference punching end height.

FIG. 2 shows an operating state of the same machine but without tools at a relatively high rotational speed or stroke speed, for example, 1500 revolutions / minute. This high rpm, that is, the elastic deformation of the tool due to the high stroke number, so-called dynamic deflection occurs. This condition is schematically depicted in FIG. 2 as the leverage 2 deflection. However, the height WSH at the end of the punch ultimately affects the press-in depth, so it must be kept constant. Therefore, in order to maintain the height WSH at the end of the punch, it is necessary to correct the bearing corresponding to the dynamic deflection. In other words, it is necessary to perform a height correction equal to the dynamic deflection.

FIG. 3 depicts the same punch press in the operating state of punching at 100 strokes / minute. Thus, the rpm rpm is the same as that of FIG. 1, except that the upper tool 8 of the punch, the lower part of the die, together with the workpiece or band (web) 10 to be punched or embossed to produce the product. The tool 9 is depicted in FIG.
The punched material is shown at 13.

For example, in the state of FIG. 1 at a low rotation speed of 100 times / minute,
There is no dynamic force on the machine. However, by each operation of punching and embossing, that is, generally by the work performed, as shown in FIG.
An upward force suitable for machining occurs, which force is depicted in the schematic representation of the individual bearings and leverage. The source of the error here is in particular the play in the bearing. In order to be able to perform a complete punch, the entire play must first be eliminated. At this time, since the ram is pushed upward, it is apparent that the ram needs to be adjusted downward by S so that the ram is again held at the set height WSH at the end of punching.

FIG. 4 shows a punch press at high rpm, ie, the same high stroke rate (/ min) as in FIG. Crossing where play went by dynamic big power (about 300-400
At the same time, a dynamic deflection similar to that of FIG. 2 occurs again. Height WSH at the end of tool punch
It is necessary to correct the press-fit depth by the difference width F + S by moving the ram in order to keep the pressure constant again.

From the above description, depending on the number of strokes, the tool and the punch material (e.g. metallurgical properties), the ram must always assume different heights. It must also be noted that the measurement of the indentation depth without punching does not lead to an exact change of the ram height.

FIG. 5 shows a diagrammatic representation of a commonly known control device based on FIG. 1 of West German Patent No. 2731084. There, the number of strokes (/ min) is guided from one corresponding sensor 26 to the first element 20, where the reference characteristic curve is stored. The reference characteristic curve is provided for every tool used in this machine. The reference characteristic curve is programmed by the input device 21 of the control device. The reference characteristic curve shows, for example, the press-fit depth as a function of the number of strokes. In the second element 22, which is a comparison device, the reference indentation depth provided by the first element 20, which is the control device, is compared with the actual indentation depth, which is determined by a sensor 25 on the motor 24 side of the indentation depth adjustment device. Is detected. If the actual indentation depth deviates from the input limit of the reference indentation depth, the element 22 is switched
Activate 23 and operate the motor for the press-fit depth adjustment device,
Move the height of the ram or punch tool up and down. The operation of the adjusting device including the switch 23, the motor 24, and the sensor 25 is continued until the actual value again becomes the reference value within the range of the control accuracy. However, since the conventional punch press is adjusted only once at the start of the operation of the press as described above, a satisfactory result cannot be obtained in the entire region of the number of operating piston strokes.

FIG. 6 is a schematic explanatory view showing an example of a design of a control device for a punch press constituted by the present invention. In this figure,
Basically, only the control device corresponding to the element 20 in FIG. Other elements in FIG. 5 are omitted in FIG. 6 for simplicity. These elements 22, 23, 24, 25 are basically configured in the control device of FIG. 6 in the same manner as in the case of the known control device of FIG.

Element 30 also includes a tool-specific reference characteristic curve of a known type programmed by input device 21. It also includes an input device for the stroke by the signal received from the sensor 26. However, the entry, i.e. the input means 31, is used to enter a numerical value, by means of which the press-fit depth is corrected for the number of strokes currently being performed. This is explained in more detail with reference to FIG. The figure illustrates a reference characteristic curve 40 showing the relationship between the press-fit depth / the number of strokes. This reference characteristic curve is drawn as a straight line for simplicity. This means that when the extrusion adjustment is correct, this reference characteristic curve has a generally parabolic shape. This diagrammatic reference characteristic curve shows that the press-in depth is controlled to the current stroke number.

However, it will be understood from the above description of FIGS. 1 to 4 that this reference characteristic curve only incompletely represents a complex practical function. Similarly, the parts punched by the reference characteristic curve can deviate significantly from the desired manufacturing tolerances if the control of FIG. 5 proceeds according to the reference characteristic curve 40. Therefore, the control device for the punch press constructed according to the present invention is an inlet (input means) for inputting a value whose control device value departs from the reference characteristic curve.
Contains 31.

FIG. 7 shows how a diagram of press-fit depth / number of strokes is represented. Punch press operator, when the number of strokes H _1, corresponding points of the reference characteristic curve
It can be confirmed that the operation according to 42 does not result in a punch product having the desired accuracy. Here, the correction value W is equal to the entrance 31
Is input to the control device. The punch press is operated in such a case at a working point 41 which is represented by the reference characteristic curve 40 and the input correction value W. The value W is input by various methods, for example, a numerical keyboard as a digital value, a variable resistor as an analog value, or a predetermined small width +/- board key. The type of input depends on the individual design of the control device at that time. Generally, the value input by a board key or a push button at the entrance 31 generally has an adjustment width of about 1/1000 mm per step (step), and the operator observes a punched product at the number of strokes at that time. During the operation, input the required number of times. This input value is stored in the addition / subtraction calculator 35, and the adjustment range is given to the addition / subtraction computer 36 therefrom, and gives a change in magnitude corresponding to the number of input steps.

The illustrated embodiment is mainly described for the value W. Of course, W can be larger or smaller, and can be operated on the other side of the reference characteristic curve where the working point 43 appears. If the accuracy of the punch product obtained at the new working point 41 is not satisfactory, another value W is of course entered.

As the number of strokes changes, the value W is changed automatically by the control device. This is to continuously curve (curve 44 drawn with broken lines) is not H ₄ or Hmax to no strokes number H ₁
Performed continuously as depicted during Hmin. This is created by the additional characteristic curve 44 being calculated from the known parameters of the reference characteristic curve 40. The new curve, in the illustrated embodiment, extends through the new working point 41 and, at the value of the minimum stroke number, touches or intersects the reference characteristic curve. However, it is also possible to from the correction value W ₂ with varying only individual number of strokes from H ₂ to H ₄ and W _4. In that case, the resulting new "work reference characteristic curve" is formed, for example, by connecting the individual points with a right-angled bent line or with a straight line.

The reference characteristic curve 40 for the indentation depth preferably extends in a parabolic manner, and the change of all parameters of such a parabola is calculated in a new way from a value W adjusted at an arbitrary number of strokes, As a result, a new working reference characteristic curve is formed. In that case, the control unit is obviously preferably formed by a digital processing control in which the necessary calculations and corresponding adjustments are made.

However, FIG. 6 shows an exemplary embodiment in which a creative design of the control device can be obtained with basically low cost. Exit 33
The signal to the comparison device (second element) 22 at, so that the addition / subtraction calculator 35 adds the input value W to the reference value from the reference characteristic curve in order to create a new working point. It is formed. When the number of strokes changes, the second
The addition / subtraction calculator 36 can individually subtract from the existing new working point 41, for example, subtracting the number of steps k when the number of strokes decreases, or adding the number of steps k when the number of strokes increases. Operate.

In general, the value W or the new working reference characteristic curve is appropriate for a given tool, respectively, for a certain period of time, so that the control unit determines at least one value W, preferably the reference characteristic curve for the whole operation and its tool. It is preferable to include a storage device in which a number corresponding to is stored. This makes it possible to directly recall the reference characteristic curve of the tool already used, whereby the work is performed along the reference characteristic curve and based on each of the corrected or changed curves , The work proceeds directly.

The above description of the indentation depth is also valid for the extrusion length. At that time, the corresponding reference characteristic curve may be a straight line. However, the principle and means of correction are the same. It is also very evident that the punch press can also introduce a correction, ie a correction of either the extrusion length or the indentation depth. However, both possibilities are preferably envisaged for exactly the same punch press.

While preferred embodiments of the invention have been shown and described, it will be clearly understood that the invention is not limited thereto and that various embodiments and implementations are possible within the scope of the appended claims.

[Brief description of the drawings]

1 to 4 are simplified basic illustrations of the most important moving parts of a punch press. FIG. 5 is an explanatory diagram of a known control device. FIG. 6 is an explanatory diagram of the control device described according to the present invention, and FIG. 7 is a characteristic curve diagram for explaining the operation of the control device of FIG. Description of reference numerals: 1 ... crank arm, 2 ... lever 3 ... adjustment spindle, 4 ... piston rod 5 ... ram, 6 ... tray 7 ... bearing, 8 ... punch (upper tool) 9 ... Dies (lower tool), 10 Band 20 First element 21 Input device 22 Second element 23 Switch 24 Motor 25 Sensor 26 Sensor 30 Element 31 Inlet, 40 Reference characteristic curve 41 Working point, 42 Reference characteristic point 43 Working point, 44 Curve

Claims (3)

(57) [Claims] 1. An adjusting device which is designed to adjust and operate a variable number of piston strokes per unit time and which functions operatively to set the press-in depth of a punch of a punch press. A punch press containing a control device for communication, wherein a respective reference characteristic curve extending in accordance with the characteristic value of the respective punch tool used is stored in the control device (30), the reference characteristic curve being stored in the control device (30). Represents an additional correction value of the press-fitting depth deviating from the characteristic value for the press-fitting depth of the punch by the number of strokes so that the press-fitting depth of the punch is the same for any number of strokes, and based on the reference characteristic curve. And the control device (30) includes the press-fit depth adjusting device (23, 24, 25).
The input device inputs a correction value of the press-fit depth deviating from the value of the press-fit depth according to the reference characteristic curve at an arbitrary number of strokes, and at least one input correction value is stored. Contains storage,
The input correction value deviating from the value according to the reference characteristic curve is added to or subtracted from the reference characteristic curve having the characteristic value of each punch tool to be used, thereby adding the reference characteristic. It contains an addition / subtraction calculator (35) for producing said signal in which a parallel movement of the curve takes place and communicates with it for receiving the signal originating from said first addition / subtraction computer (35). It contains another addition / subtraction calculator (36) in which the input values are adjusted by the number of strokes and added by adding or subtracting with the signal of said reference characteristic curve, whereby The punch press, wherein an additional movement of the reference characteristic curve is further performed. 2. A parabolic reference characteristic curve which can be stored in said control device, and wherein said control device is designed to adjust all parameters of the parabola with respect to the number of strokes. Item 1. A punch press according to item 1. 3. The control device operatively generates a signal for a feeder of a punch press according to a second reference characteristic curve, and further comprising the input means comprising: The controller, which is designed to input a value for the feed length of the material to be punched out of the way, and which issues a signal for the feeder, the input value is adjusted by the number of strokes and the reference characteristic The punch press according to claim 1, designed to add to a curve.