JPS62148041A - Control device for roll feeder - Google Patents

Abstract

PURPOSE:To set quickly and effectively a revolving speed of an optimum press machine which has conformed with a feed condition, by providing an operating part for calculating the maximum number of times of a feed of a roll feeder per unit time, based on the feed condition which is given through a set value input means. CONSTITUTION:On a controller part 22, an operating part 33 is provided, and the operating part 33 is provided with an arithmetic circuit 33a for calculating an SPM (the maximum number of times per unit time) of a roll feeder. Also, this part is constituted of an arithmetic circuit 33b for calculating the remaining work time, based on the SPM which has been calculated by said arithmetic circuit 33a, or an SPM which has been measured actually from a synchronizing signal with a press machine 27, and the number of times of a feed (the number of times of a press) which has been set. Accordingly, when a worker sets such feed conditions as a feed length, the number of times of a feed, a feed speed, and an acceleration at the time of acceleration and deceleration, from a control panel 21, the SPM of the roll feeder is calculated instantaneously by the arithmetic circuit 33a, and displayed on a display device 23.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a roll feeder used as a feeding device for feeding materials for machine tools in various production plants such as press machines, and as a conveying device for products. In particular, the present invention relates to a roll feeder control device with expanded monitoring functions.

[Prior art]

A roll feeder is one of the means for feeding corrugated material to a press or the like. This roll feeder is a device that has a pair of upper and lower rolls, inserts the material to be transported between the rolls, holds the material therebetween, rotates these rolls at a predetermined angle, and supplies the material intermittently using the frictional force of the rolls. be.

FIG. 4 shows an example in which a roll feeder is used as a feeding device of a press machine. In the figure, 1 is a roll feeder, which has a pair of upper and lower rolls la and lb, and uses a control motor 1c as a driving source. Reference numeral 2 denotes a roll feeder control device for setting the feed rate and feed rate of the material.

Furthermore, 3 is a press machine, and 4 is a mold attached to the press machine 3. 5 is a press machine control device that sets the rotation speed of the press machine 3 and receives synchronization signals and alarm signals from the rotary cam of the press machine 3, the pilot pin provided in the mold 4, etc. (not shown). These signals are then sent to the roll feeder control bag @2.

Based on this synchronization signal, the roll feeder 1 intermittently feeds material into the mold 4 in accordance with the movement of the ram of the press 3. Note that 7 in Figure 1 is a loop sensor, and 8 is a material manufacturer's device.

In this way, the control motor l is used as the drive source of the roll feeder 1.
When numerically controlled using the press machine 3, the feed amount and feed speed of the material can be easily adjusted, and the setup time for the adjustment work can be significantly shortened compared to when the power of the press machine 3 is also used. and its use has been expanding in recent years.

By the way, the press machine 3 and the roll feeder 1 can perform accurate press processing only when they are accurately synchronized. That is,
The feeding capacity of roll feeder 1 is.

If the press machine 3 cannot keep up with its working capacity, accurate press processing cannot be performed, and if the machine does not have an alarm stop function, it may cause damage to the mold 4. Furthermore, even if the press has an alarm stop function, the press operation must be interrupted.

Therefore, during press working, the rotation speed of the press machine 3 must be set so as not to exceed the maximum number of feeds per unit time (hereinafter referred to as SPM) of the roll feeder 1.

By the way, the SPM of the roll feeder 1 is determined by the feed length of the material that can be fed at one time, the maximum value of the feed speed, the acceleration during acceleration/deceleration, and the possible time of the feed operation that occupies one cycle of press working ( Generally, in roll feeder 1,
When the top dead center of the ram of the press machine 3 is O@, the rotation angle is 240° to 01 to 1 with respect to the rotation direction of the rotary cam.
(supplying material within a range of about 20°).

Conventionally, to obtain this SPM, as shown in Figure 5, the maximum value of the feed rate and the acceleration during acceleration and deceleration are set to constant conditions, and the SPM that shows the relationship between the feed length and SPM under those conditions is calculated. A common method is to read from a curve diagram. In addition, Fig. 5 shows two types of SPM curve diagrams with different feeding conditions.
A PM curve diagram is required.

However, in recent years, as the trend toward high-mix, low-volume production has increased, the number of products produced per mold set (mold life span) has been decreasing. Furthermore, as product shapes become more complex and higher precision is required, multiple stamping steps have become necessary to complete the product.

Therefore, various molds are required, and the number of times the molds are replaced has increased.

On the other hand, the feed length of the material is determined according to each mold, and the upper limit of the maximum feed rate and acceleration/deceleration is determined depending on the type of material being fed, the processing purpose of the mold, etc. ing. In order to better satisfy these feeding conditions, the control function of the roll feeder has also been improved, increasing the maximum feed rate,
Roll feeders with variable acceleration during acceleration and deceleration are commercially available.

[Problem that the invention seeks to solve]

However, as it became possible to set multiple feed conditions for the roll feeder, when calculating the SPM of the roll feeder from the SPM curve diagram shown in Figure 5, the S
A PM curve diagram is required. For example, if there are nine types of maximum feed rates and five types of acceleration during acceleration and deceleration, there will be 45 types of SPM curve diagrams. It is necessary to find an SPM curve diagram that matches the feeding conditions from among these many SPM curve diagrams and read the SPM of the roll feeder. Furthermore, each time the mold is replaced, the feed conditions of the roll feeder change, so it is necessary to read the SPM of the roll feeder again, set the rotation speed of the press machine to a value lower than that, and then start work. Therefore, as the feed function of the roll feeder increases, it takes time to set the rotation speed of the press machine, and as the number of die changes increases, the number of settings increases, and the setup time in press work increases. There was a problem with the increase.

In addition, when setting the rotation speed of the press machine, another method is to set it by the operator based on experience, or to lower the rotation speed of the press machine and gradually increase the rotation speed to increase the feed speed of the roll feeder. There is also a method of determining the point at which it is no longer possible to follow the rotational speed of the press machine (determined by an alarm function, etc.), and setting the rotational speed of the press machine below that point before starting the pressing operation. However, in the former case, the rotational speed of the press machine is inevitably set roughly, making it impossible to perform efficient work.

Furthermore, the latter method has a problem in that setup time is required to set the rotation speed of the press.

[Structure of the invention]

The present invention was made in view of the above-mentioned problems, and instantly calculates and displays the SPM (maximum number of feeds per unit time) of a roll feeder under each feeding condition, and
The purpose of this invention is to shorten the setting time by setting the rotation speed of the press machine to the optimum rotation speed based on M.

The configuration includes a set value input means for a roll feeder control device to set feeding conditions, and a control circuit that sends a control signal to the control motor based on the feeding conditions given via this setting input. The device includes a calculation unit that calculates at least the maximum number of times the roll feeder is fed per unit time based on the feeding conditions given through the set value input means, and a display unit that displays the calculation results of the calculation unit. It is.

[For production]

Once the feeding conditions are set, the maximum number of feeds of the roll feeder per unit time is calculated based on the setting conditions, and the value is displayed on the display section. Based on this value, the rotation speed of the press is set to the optimum value.

〔Example〕

The present invention will be described in detail below using the drawings.

FIG. 1 shows an embodiment of a roll feeder control device according to the present invention. Broadly speaking, the control device 20 includes an operation panel 21 for inputting feeding conditions, and a control signal for the control motor of the roll feeder based on the inputted feeding conditions and alarm signals and synchronization signals from the press machine. A controller section 22 that calculates the SPM etc. of the roll feeder, a display device 23 that displays feeding conditions, SPM etc., and a driver section that actually controls the rotation of the control motor based on the control signals from the controller section 22. part 24 and the power supply O
N.

It is composed of a strong electric unit section 25 and a case 26 for performing OFF control and exchanging signals between the press machine and the controller 22.

Furthermore, the controller unit 22, which is the gist of the present invention, will be explained in a foreign language manner using the blocks shown in FIG.

This controller unit 22 controls the feed length, number of feeds, feed speed, acceleration, etc. input for each mold from the operation panel 21.
Memory 3 that stores feed conditions such as acceleration during deceleration
1.

The feed conditions input from the operation panel 21 are once stored in the memory 31 and then output to the control circuit 32. In the control circuit 32, based on this feeding condition,
Further, a control signal to the control motor is generated based on a synchronization signal and an alarm signal inputted from the press machine 27 via the strong electric unit section 25.

It controls feeding, starting and stopping of the roll feeder 28. Further, by operating the operation panel 21, a start/stop signal for the press machine 27 is outputted from the control circuit 32 to the press machine 27 via the high-power unit section 25.

On the other hand, part of the feeding conditions stored in the memory 31.

In this embodiment, the model number of the mold and the feed length and number of feeds corresponding to this model number are selectively displayed on the display device 23.

Further, the controller section 22 is provided with a calculation section 33. This calculation section 33 functionally includes a calculation circuit 33a that calculates the SPM (maximum number of feeds per unit time) of the roll feeder, and an SP calculated by this calculation circuit 33a.
Alternatively, it is composed of an arithmetic circuit 33b that calculates the remaining working time based on the SPM actually measured from the synchronization signal with the press machine 27 and the set number of feeds (number of presses).

Next, a description will be given of how the arithmetic circuit 33a calculates the SPM. The relationship between the feed speed and the feed time for the actual roll feeder 28 can be theoretically approximated by the three graphs shown in FIG. In each graph, it is assumed that the absolute values of acceleration and deceleration are equal.

Graph a shown by a solid line is a case where the object is accelerated at a constant acceleration, performs uniform motion at a set maximum speed, and then decelerated, and graph b (shown by a broken line) is a case where the object is accelerated at a constant acceleration. , when the speed is decelerated immediately after reaching the set maximum speed. Further, c (dotted chain line) is a case where the speed is decelerated before reaching the set maximum speed.

Here, the time required for one cycle of press processing is S(+m
1n), the maximum speed of the roll feeder is V (m/win)
, the acceleration during acceleration/deceleration is A (m/min”),
Let L (m) be the length of the -th feed, and T (win) be the time required for the -th feed.

In the case of graph a, the time of uniform movement is T1 (win
), and if the time required for acceleration movement and the time required for deceleration movement are respectively T and (win), then the feed length is L = (1/2) AT: +VT, + (1/2) AT,=V
T1+AT.

=v (T, +T2) =V (T −2T −+ T 2) =V (T −
T == ) (m ), and T,=
Since V/A, L=V(T-V/A)(+++),
Therefore, T=L/V+V/A (+m1n). On the other hand, in the case of a roll feeder, the rate at which the feeding operation can be performed during one cycle of press processing is approximately 273, so the time S required for -cycle is 5 = (3/2) T = (3/2) ( L/V+V/A)
(sin).

- If the time required for a cycle is found, the maximum number of feeds per unit time SPM can also be found.

S P M = 1/5 = (2/3) - (V A / (A L
+V")) (number of times/+*in)...■ Similarly, in the case of graph b, the time required for acceleration/deceleration motion is the time required for one feed operation. Therefore, the feed length L is .

L=V-T, =V ・(1/2)T (m)
becomes.

Therefore, T = 2L/V (siin)
becomes.

Also, since T = (2/3)S, the time S required for -cycle is.

5=(3/2)・T=3L/V (win)
becomes.

Therefore, the maximum number of feeds per unit time SPM is: SPM=L/S=V/(3L) (number of times/+m1n)
``''■Furthermore, as shown in graph C, when the speed is decelerated before reaching the set maximum speed, the time 2T required for acceleration/deceleration motion becomes the time required for one feed operation. Therefore, the feed length is L=V'・T3.

Also, since V' = AT, 1, = AT, = (1/4) AT"
becomes.

Therefore, T=2(L/A)''.

Also, since T=(2/3)S, the time S required for -cycle is 5=(3/2)T=3(L/A)" (min)
becomes.

Therefore, the maximum number of feeds per unit time SPM is: SPM = 1/5 = (1/3) (A / L)
'(Number of times 7IIIin)...Since it is more than 0, the SPM of the roll feeder is as follows: If the relationship between the feed speed and the feed time is shown in graph a, SPM 2/3) - (V A/(A
r=+v2))(number of times/wain) In case of graph b SPM=V/(3L)(number of times/win
) For graph C S P M = (1/3) - (A/L
) + (number of times/@in).

On the other hand, when calculating SPM, it is necessary to decide which formula to use for calculation based on the set values of the feed conditions.The relationship between feed speed and feed time corresponds to graph b. It is determined in the arithmetic circuit 33a.

That is, in the case of graph b, as mentioned above, the feed length L
is expressed as L=V-(1/2)T (V: maximum feed speed, time required to feed T knee times), and when further transformed, L=V''/A (A is the time of acceleration/deceleration). acceleration),
Based on this relational expression, the feed length L is calculated from the acceleration A and the maximum feed speed V set as feed conditions. The relationship between the calculated feed length L and the feed length L' actually set based on the feed conditions is investigated. If L'> L, the relationship between feed speed and feed time becomes graph a, and L'
If =L, the graph will look like b, and if L'<L, the graph will look like c.

In this way, it is possible to select an SPM calculation formula that meets the feed conditions and obtain the SPM under the set feed conditions. A slightly smaller value is displayed on the display device 23, allowing for a slight error in the SPM calculated in this manner. Then, the operator looks at the SPM of the roll feeder, sets the number of rotations (the number of presses per unit time) of the press machine 27, and starts the press operation. Furthermore, when the press operation is started, the actually measured number of feeds per unit time is displayed on the display device 23 based on the synchronization signal from the press machine 27 instead of the calculated SPM.

On the other hand, the arithmetic circuit 33b calculates the SPM.

The remaining working time is calculated based on the number of feeds (number of presses) set as the feed condition. In addition, the arithmetic circuit 33b
When the press operation actually starts, the actual number of feeds per unit time is measured based on the synchronization signal from the press machine, and the remaining operation time is calculated based on this measured value. The remaining working time calculated by the arithmetic circuit 33b is displayed on the display device 23 together with the SPM of the roll feeder.

Therefore, if one worker sets the feed conditions such as feed length, number of feeds, feed rate, and acceleration during acceleration/deceleration from the operation panel 21 before starting press work, the roll feeder's SPM (feed per unit time) Since the number of rotations) is instantaneously calculated by this arithmetic circuit 33a and displayed on the display device i23, it is possible to judge at a glance to what degree the rotation speed of the press 27 should be set. Therefore, as in the past, the rotation speed of the press 27 can be determined from a large number of SPM curve diagrams (in the example, there are 45 types of SPM curve diagrams since there are 9 types of maximum feed speed and 5 types of acceleration during acceleration/deceleration). Compared to reading, the reading time can be significantly shortened, and the reading error is also extremely small. Relying on the alarm function of the roll feeder 28.

Compared to setting the rotation speed of the press machine 27.

The settings are accurate and even beginners can perform efficient press work.
Setting time can be shortened.

Furthermore, since the remaining time for pressing work can be displayed, it becomes easier to schedule the work to be started next.

〔Effect of the invention〕

As described above, in the roll feeder control device of the present invention, the controller section includes a calculation section that calculates at least the maximum number of times the roll feeder is fed per unit time based on the feeding conditions input by the set value input means. The configuration has the following. Therefore, the maximum number of feeds per unit time of the roll feeder can be instantly calculated for each feed condition, and the calculated value is displayed on the display device, so based on this value, the optimal press machine that matches the feed conditions can be calculated. The rotation speed can be set, and anyone can quickly and effectively set the rotation speed of the press machine without having to find it from an SPM curve diagram or relying on the operator's experience as in the past.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a block diagram showing its configuration, and Fig. 3 is a diagram showing feed speed and feed time in an embodiment of the present invention. FIG. 4 is a diagram showing the relationship, and FIG. 4 is a schematic diagram showing a general press line, and FIG. 5 is a diagram showing an example of an SPM curve diagram of a roll feeder. 20...Control device 21...Operation panel 22...
・Controller part 23...Display device 24...Driver part 25...High-power unit part 33...
Arithmetic unit Patent applicant Futaba Electronics Co., Ltd. 23 Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] A material to be conveyed is held between a pair of upper and lower rolls, at least one of the rolls is connected to a control motor, the control motor is used as a drive source, and the pair of rolls is controlled by a control signal from a control device. In a roll feeder that rotates a predetermined angle and uses the frictional force thereof to intermittently feed the material to be conveyed to a machine tool such as a press machine, the control device includes a set value input means for setting feeding conditions, and a set value input means for setting feeding conditions; a control circuit that sends a control signal to the control motor based on the feed condition given through the input means; and a control circuit that sends a control signal to the control motor based on the feed condition given through the set value input means; A control device for a roll feeder that includes a calculation section that calculates the maximum number of times of feed, and a display section that displays the calculation results of the calculation section.