DE2352648A1 - PROCESS AND EQUIPMENT FOR SELF-TRIMMING THE EDGES OF A PLATE - Google Patents

Description

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Munich i'i, Stsinadorfefr. 1§ . f \ ο C "J C / rt

310-21.56-6Ρ (21.56-7Η). 19 '. 10th 1973

CREüSOT-LOIRE, Paris (France)

Method and device for automatic trimming of the edges of a sheet metal

The invention relates to a method and a device for automatic trimming of the edges (trimming) of a sheet that is to be supplied by a sheet with mutually parallel edges.

This method and device is suitable for clipping the edges (trimming) of a metallic sheet with raw edges after 'rolling and annealing. They are also suitable for

310- (72/94) -Bgn-r (15)

409818/0921

ORIGINAL INSPECTED

cutting (trimming) a plate made of any material.

By the method and the device according to the invention can a sheet with parallel edges and a predetermined width is obtained; also automatic trimming of a sheet metal that has concave or convex edges over a great length is possible.

The method according to the invention is essentially characterized that it consists of the successive steps,

- bring the sheet in front of a pair of scissors so that the longitudinal axis of the sheet is essentially parallel to the cutting line,

- the distances between two points e and e ', which are near the ends of the from the edge away from the cutting line, measure from a reference line,

- the distance of at least one intermediate point from measure the edge away from the cutting line from the reference line,

the error in straightness of the removed edge as a function of the distance to calculate between the end point and the intermediate point adjacent to it,

409818/0921

- bring the sheet to the scissors,

- to measure the distances of the end points e and e ¹ from the line of intersection perpendicular to the end reference points, which are at a distance r from the line of intersection, when passing through the edge adjacent to the plane of the reference points:

- the distances of the end points e and e 'from the reference line perpendicular via intermediate reference points which are at a distance r from the line of intersection are perpendicular to the line of intersection of the one adjacent to the end point in question. Intermediate point of the near-scissor edge in the passage to measure the near edge,.

- calculate the width of the sheet at the location of each point e and e ' to subtract any straightness errors of hollow edges from each width, so that the usable width results, and then the final Subtract the width so that the entire width portion to be cut away results,

- to adjust the points e and e 'the sheet metal towards the cutting line to be advanced to values equal to the sum of the final, corrected by the distance between the reference line and the intersection line Width, half of the width to be cut away and the straightness error correspond to the distant edge,

409818/0921

ORIGINAL INSPECTED

-A-

- to cut the sheet,

- retrieve the sheet metal from the cutting line,

- to turn the sheet by 180 around an axis parallel to the cutting line,

- to push the sheet forward so that the trimmed edge hits one The distance from the reference line is set equal to the final adjusted for the distance between the reference line and the cutting line Width is

- to cut the sheet metal,

- bring back the tin and take it away.

The cutting device according to the invention consists essentially of

- edge trimming scissors,

- a horizontal roller table that is at the same height as the cutting table of the scissors is arranged and is to be connected to devices for bringing in and removing the sheet metal,

- At least two carriages that are perpendicular to the cutting line will,

409818/0921

- Devices for gripping the sheet, each one on the scissors side At the end of each slide is attached,

- motors for linear movement of the carriages in both directions,

- a device for turning the sheet after the first cut,

- sensors that detect the passage of the sheet edge adjacent to the cutting line feel and at the same distance from the cutting line, one in each case in the direction of displacement of each carriage are,

- Feelers, one at each end of the scissors Slide and gripping device existing whole arranged and the advancement of this whole is intended to be controlled and by the The edge away from the cutting line is notched,

- Bait (d. S. Analog-to-digital converter), which the position of this Specify the sensor relative to the cutting line,

-. an automatic sequence control for the drive motors of the Table, scissors and turning device,

- a digital control unit, which controls the movement of the sledges according to the signals from the bait and the sensors, for

409818/0921

i. -

the calculation of the final width of the sheet.

Further features and advantages of the invention will become apparent from the following description of exemplary embodiments and the appended Drawings visible. Show it:

1 shows a view of the system from above, FIG. 2 shows a section along line AA in FIG. 1, FIG. 3 shows a section along line BB in FIG. 1, FIG. 4 shows a section along line CC in FIG. 1, Fig. 5-9 different phases of the operation of the system,

10 an explanation of a first method according to the invention ,

11 an explanation of a second method according to the invention ,

12 shows a simplified diagram of the overall control of the system.

40981870 * 21

As shown in FIGS. 1, 2, 3 and 4, the system contains a Sheet metal supporting table 8, which consists of rollers 81 from the horizontal axial direction, and a pair of scissors 7, which are arranged to the side of the table is. These are intended for trimming the edges of the sheet; th scissors contains a cutting wheel 71, which can be moved along the cutting line 72, and a hold-down 73, which holds the sheet metal to press on the table 74. The roller table 8, which is to move the sheet metal parallel to the cutting line 72, can be equipped with an infeed roller table, which is arranged in the rolling direction in front of the rolling table, and with a discharge roller table arranged in the rolling direction behind the rolling table be connected. The rollers 81 are driven by motors 82. The sheet metal can be adjusted perpendicular to the cutting line 72 by adjusting devices 1, 2, 3, 4 can be moved. Any of these adjusting devices 1, 2, 3, 4 consists of a slide 11, 21, 31 or 41, which is guided on a slide track parallel to the rollers 81, and a bracket 12, 22, 32 and 42, respectively, which are directed towards the scissors. .

These adjustment devices 1, 2, 3, 4 contain drive motors 161, 261, 361 and 461, which are the parallel to the rollers 81

409818/0921

Cause adjustment. These motors cause the transverse shift one carriage each by means of a gear 18, 28, 38 or 48, each with a rack 15 fixed to the frame of the roller table 8, 25, 35 or 45 combs. These motors also drive the baits 17, 27, 37 and 47, respectively, which are used to adjust the position of these adjusting devices relative to cutting line 72. The brackets 12, 22, 32, 42 are each with a switch 131, 231, 331 and 431, respectively provided, which, when the clamp rests against the sheet metal in the open position, by means of a servomotor (not shown), that the clamp closes and grips the sheet metal. Additional switches, also from the sheet metal, before the brackets on Contact sheet metal, operated, are used to. To steer the slide at low speed. The power supply to these adjustment shifts before direction is done through a cable guide 23 each. The transverse shift of the sheet through the adjustment devices is facilitated by rollers 83 from the axial direction parallel to the cutting line, which is raised to above the rollers 81, namely moved vertically by means of hydraulic servomotors controlled by electrovalves can be. Each of these clamps can move vertically relative to the carriage associated with it and is at the level of the rollers 83

409818/0921

adjustable. After the first edge of the sheet is trimmed, the sheet turned by 180 by means of a turning device 14, which Includes suction cups 144 connected to a vacuum pump and carried by turning arms 143 driven by a rotary motor can be turned by 180. This turning arms 143 are mounted at the end of horizontal arms 142, which are rigid with a beam 145 are connected, which is arranged parallel to the cutting line and fixedly connected to two lateral carriages 141, which in height are adjustable along two lateral columns 146. Turning the Turning arms 143 happens when arms 142 and the associated whole are in a high position, i.e. H. at a height H above the Table 8 is located, which is at least equal to half the largest width of a sheet.

The mode of operation of the device and the method according to the invention will now be described with reference to FIGS. 5-9:

The first thing the operator calls to bring the sheet metal the motors 82 of the rollers of the table 8 and of the feed roller table arranged in front of this in the rolling direction start up. To-

409818/0921

where the sheet P is located in front of the table 8 in the rolling direction The stop has passed, the feed roller table is stopped and the table 8 switched to reverse gear; the sheet P comes back to the stop and remains when it reaches it has to stand.

The sheet P then has the correct position for insertion into the scissors.

Now the operator selects P depending on the length of the sheet the clamp 22 or 32 or 42 that the sheet metal on its in the direction of travel should grab rear end; the clamp 12 at the front end of the plate is always in operation.

. . Her operator enters the digital control unit width of the sheet to be produced.

It then triggers the automatic cycle of action.

The lifting rollers 83 rise and lift the sheet metal over the rollers 81 ″ of the table 8. The solenoid valves of the control of the hy-

409818/0921

hydraulic drive motors of the clamps are operated, and the brackets also lift.

The clamp 12 and the selected clamp (in the case of FIG. 5 the clamp '42) are advanced towards the sheet metal P, slowing down when they approach the sheet metal and lay against the sheet metal.

The bracket 12 and the bracket 42 close to the Place e and e 'around the edge II removed from the cutting line 72 of the sheet.

The two brackets line up parallel to the cutting line a distance a * equal to that increased by a safety distance to be produced width of the sheet.

The intermediate brackets 22 and 32, which lie between the two outermost brackets 12 and 42 holding the sheet metal, advance to points i and i ^{1 of} the edge II (FIG. 5), whereby they remain open.

409818/09

In the case of a hollow edge, the difference in position between the outermost bracket and the next intermediate bracket detected by the control unit. In the one shown in FIG For example, this difference is represented by the difference A-B = d 'and by the difference D-C = d ".

It is an advantage if the two brackets are parallel to the Set the cutting line. Then D = A.

The brackets 22 and 32 go back to the end of their return »The two outermost brackets 12 and 42 then advance the sheet P; whose edge I actuated during feed in the position shown in Fig. 6 with full lines Sensors 19 and 49, which are used as reference values for calculating the dimensions to serve. The values E and H displayed by the baits 17 and 47 are stored.

The sheet P is further advanced and actuated when the Edge is concave, the feelers 29 and 39 in the position shown in Fig. 6 with dashed lines. When actuating the guide

AQ9818 / 0921

- f3. -

The values of the baits 17 related to the cutting line 72 are lighter and 47 F and G. ', respectively.

Several methods can be thought of for setting the sheet metal for cutting edge I.

With the various methods, the widths of the uncut sheet metal at the locations of the two outermost points e and e ^{1 are first} calculated.

These real widths L ¹ and L at the locations of the outermost retention points e 'and e are determined by subtracting the value r (distance between the cutting line and the feelers) from the distances E and H, respectively.

In the first method, the edge defects are in the places. determined by the intermediate brackets. They are in Fig. 10 and the one below Table I determined.

The values AB = d ¹ and DC = d determine the error of the

409818/09 21

Edge II. The values E-F = d 'and H-G = d determine the error the edge I.

By subtracting the possible edge defects from the widths L ¹ and L, namely d 'and d' for L ¹ and d and d for L = L,

X German i. £ .

one holds the usable widths U 'and U of the sheet P (Fig. 10).

The final width c is drawn from these usable widths from, and so one obtains the widths of the total width portion to be cut off at the points of e and e '; these latitudes halve to distribute them over the two edges.

The setting, as shown in FIG. 7, is ended when the points e ¹ and e have a distance from the cutting line which is the same

i plus half the width portion c 'to be cut off plus the edge error d' (for e ¹ ),
d>

£ plus half the width portion c to be cut off plus the edge error d (for e), or else

L ¹ minus half the width ^{portion to be cut off c 1} minus the edge error d '(for ¹ ),

409818/0921

L minus half of the width portion to be cut off c minus that Edge error d (for e)

is. This is because the final width & is equal to the actual width minus two half the width components to be cut, minus the error in edge I and minus the error in edge II.

• The setting is {Fig. 7) finishes when the bait 17 and state the values given in Table I below:

(Table I, page 16)

409811/0921

Table I.

Frontmost gripper Rearmost gripper

Actual widths

L ¹ = Er L = Hr

Straightness d '= E-F if E-F> edge I error

d! = 0 if EF < d = HG if HG>

d = 0 if H-G <0

Straightness d '= A-B, if A-B> error of edge II

d '= 0 if AB <. d * DC if DC > d = t 0 if DC <0

Usable widths

U ¹ =

^L '- ^d i- ^d 2 U *

Half of the width to be cut off

el 2

c. = j

2 - 2

Attitude to the cut of the edge I.

409818/0921

After the sheet P has been adjusted, the lifting rollers are lowered; the hold-down devices 73 of the scissors are moved down and hold the sheet on the table. The cutting wheel of the scissors cuts the sheet metal.

At the end of the path of the cutting wheel, the hold-downs are 73 is raised again, and the lifting rollers 83 lift the sheet metal.

The clamps 12 and 42 go back so that the axis of the sheet comes into the turning axis of the turning device 14 (Fig. 8). The return stroke, calculated by the control unit, is equal to the distance d between the turning axis and the cutting line 72, reduced by half the final width of the sheet. The distance d must therefore be sufficiently greater than half of the largest final width 6 so that the trimmed edge is free from the scissors.

When the setting is complete, the clamps 12 open and 42. They then slide back towards the end of the return stroke.

The lifting rollers 83 lower again and place the sheet metal on the rollers of the table 8.

409818/0921

The cycle of the turning device runs during the Cutting wheel-bearing carriage of the scissors goes back to the end of the return. The cycle of the turning device runs alternately with suction cups 144 located below or above the sheet metal.

The lift rollers 83 and the end brackets 12 and 42 rise again on.

These clamps 12 and 42 (the selected ones) advance towards the sheet P and close (FIG. 8).

You push the sheet forward until the trimmed edge I hits one Distance from the cutting line 72 is set which is equal to the final width /.

The lifting rollers 83 lower, and then edge II is trimmed as with edge I.

After the cut, the sheet is lifted by the lifting rollers 83 and then retrieved by the clamps 12 and 42 to be removed from the

409818/0921

Scissors to be released and put in the position for transporting away to become.

The brackets 12 and 42 open on it and go to the End of their return stroke.

The lifting rollers 83 place the sheet metal on the roller table 8 »The sheet metal can then be removed *

'Of course ^ if the length of the sheet P is only the application of brackets 12 and 22 requires edge error calculation not necessary. The end brackets are then spaced - and

- ^ ", where E and F ⁽ the distances between the end clamps

Feern 12 and 22 when passing the edge I on the feelers 19 tiiid 29 are.

In the method described above, the edge defects are determined at the location of the intermediate brackets. But one can also consider other methods of calculating edge errors «.

40081870921

For example, the edge defects can be determined according to the central axis between the displacement axes of the end brackets will.

As with the previously described method, the brackets set parallel to the cutting line (Fig. 5), and the intermediate clamps come to rest on edge II.

The edge errors in the middle of edge II can then be based on the given values A, B, C, D, the bait and the in Fig. 11 specified distances between the carriages can be calculated.

The sheet is then advanced to the values B, H at Passing the end sensors 19 and 49 and determining the values F, G when passing the intermediate sensors 29, 39.

Table II below gives the values of the edge defects in the middle of the edges.

409818/0921

Table II

Calculated according to the values of the bait on the inlet side End-Klaminer and the Intermediate bracket Calculated according to the values of the bait on the outlet side End bracket and the intermediate bracket

Middle
Error of
Edge I.

d'ml = (A-B) if A-B> 0 d'ml = 0, if A-B < 0

c / 2 dml = (DC)

c / 2

c-b

if DC > 0 dml = 0,
if DC <0

Middle
Error of
Edge II

d'm2 = (E-F) ^ - a

if EF > 0 d'm2 = 0, if EF <0 dm2 = (HG)

c / 2

c-b

if HG> 0 dm2 = 0,
if HG < 0

Calculating the usable width at each end of the sheet and the setting of the brackets for the cut can then be made being the real widths by the different Edge defects can be corrected by detecting the largest edge defects be, etc ...

409818/0921

The overall control of the system is shown in summary in FIG. It essentially contains an automatic one Unit 6 with a programmer, which determines the mode of operation and the sequence of the motors in the system, and a digital control unit 5, showing the adjustment of the brackets according to one of the methods described above depending on the dimensions of the raw sheet, the edge defects and the final width of the sheet.

The self-acting cycle is gradually working Programmer causes. A die fitted with cams moves in front of a row in successive steps of contacts that are either the electrically operated control valves of the various hydraulic servomotors or a series of contacts 52, each of which controls a sequence of settings effected by means of the digital control unit 5. The transition of the die from one position to the next is activated by closing position switches of the automatic Unit that determine the end of the current sequence, or by a signal output by the digital control unit that the

409818/0921

Adjustment is completed.

The last clamp on the outlet side selects the automatic unit 6 from a switch 61, which is in the digital control unit enters the necessary commands through the contacts 53. When approaching of the edge I, the contacts 132, 232, 323, 432 are actuated, and these release the contacts 541, 551, 561, 571 Slowing down the brackets. After this same edge has been fully grasped, the switches 131, 231, 331, 431 are switched on. Contacts 542, 552, 562, 572 are actuated and they control the stopping of the oscillators.

Pulses of variable frequency are automatically circulated from the digital control unit to the "forward" Inputs of the electro-hydraulic servomotors 161, 261, 361, 461 controlling transmitter 162, 262, 362, 462. The transformers ensure the control of the electro-hydraulic servomotors by shaping the impulses sent by the oscillators of the digital control unit. They make possible by means of those sent out by their inner vibrators

4098 18/0921

'- 24 - |

Impulses the control of the motors even in manual mode »

i
I.

For each setting sequence, the digital control unit calculates starting from the final width entered by the encoder 51, the width supplied by the baits 17, 27, 37, 47 Values and the signals given by sensors 19, 29, 39, 49 a "position to be taken". Via the "forward" or "reverse" inputs of the transformers for controlling the drive motors the outermost carriages are supplied by an oscillator with several frequency stages. The ^ igital control unit, who knows the "position to be taken" and at every moment the "Koder position", constantly determines the "to" continuous distance "and compares it with the predetermined and stored speed ranges. If the" to traversing distance "is greater than all speed ranges, the oscillator operates at the highest frequency that the corresponds to the highest speed of the motor. If the "to be traversed Distance "becomes smaller than the first speed range, then the oscillator operates at a lower frequency, etc.

409818/09 21

Finally, the pulses are interrupted at a distance of 1 mm from the "position to be assumed" in order to prevent the electrohydraulic motor to take into account.

Of course, one can, without thereby departing from the scope of the invention, make modifications and perfections Present details or consider using equivalent means.

So can if the two opposing edges of the raw sheet are essentially parallel to each other (S-shaped Sheet), the calculation of the error of edge II can only be used to determine the usable width of the sheet.

409810/0921

Claims (1)

Expectations / 1. ^ Process for trimming (trimming) the edges of a Sheet, characterized in that it consists of the successive steps, - Bring the sheet metal in front of a pair of scissors so that the longitudinal axis of the Sheet is essentially parallel to the cutting line, - the sheet metal in the direction perpendicular to the cutting line to the Bring scissors to cut the edge adjacent to the scissors, - while the edge adjacent to the scissors passes at the height of two reference points located at a distance r from a reference line, ^{measure the distances E and F 1} between this reference line and two points e and e ¹ that are close to the edge of the sheet metal removed from the scissors at the ends of this edge and on the perpendicular to the cutting line passing through the mentioned reference points, - calculate the differences E - r and F ¹ - r, 409818/0921 Edge on the values - ~ —— or -r to set, - with respect to the reference line, points e and e 'of the distant /> S - r . / · »F '- r —J— or where 6 is the final width of the sheet after trimming, - to cut the sheet metal, - get the tin back, - the sheet metal by 180 about an axis parallel to the cutting line turn around, - bring up the second edge and the one opposite points e and e ' Set points of the 'trimmed first edge to the distance / from the reference line, -to cut the sheet metal, - to retrieve and deploy the sheet metal. 2, method of trimming (trimming) the edges of a Sheet, characterized in that it consists of the successive steps, - bring the sheet in front of the scissors so that the longitudinal axis of the sheet is essentially parallel to the cutting line, 409818/0921 - measure the distances between a reference line and the two points e and e ¹ which are on the edge of the sheet away from the cutting line near the ends of this edge, - the distance between the reference line and at least one intermediate point to measure the "glazing edge" away from the cutting line, - the straightness error of the removed sheet metal edge as a function of Calculate the distance between the end point and the adjacent intermediate point, - push the sheet towards the scissors, - the distances of the end points e and e 'from the reference line perpendicular via end reference points that lie on the perpendicular from these end reference points to the cutting line at a distance r from this, to measure when passing the edge close to the cutting line, - the distances of the endpoints e and e 'from the reference line at Passage of the edge near the cutting line through the vertical in intermediate reference points which are at a distance r from the cutting line lie perpendicular to the line of intersection of the end point under consideration measure the adjacent intermediate point of the edge near the scissors, 409818/0921 the straightness error of the edge adjacent to the cutting line as a function of the distances between the end points as the adjacent edge passes Edge at the level of the end and intermediate 'reference points to calculate, - to calculate the width of the sheet at each point e and e ^f , subtract any errors of the concave edge from each width, so that the usable width results, and subtract the final width, so that the entire width portion to be cut results, - to push the sheet towards the scissors and mark the points e and eV relative to the reference line to be set to values that match the Sum of the final width plus half the width portion to be trimmed plus the error of the remote edge, corrected by the distance between the reference line and the cutting line, - to cut the sheet metal, - bring the sheet back away from the cutting line, - the sheet metal by 180 about an axis parallel to the cutting line turn around. 409818/0921 -3Q- - to push the sheet towards the scissors and the trimmed Set the edge to a distance from the reference line that is equal to the distance between the reference line and the cutting line corrected final width is, - to cut the sheet metal and - bring back the tin and take it away. 3. A method for trimming the edges of a sheet metal according to one of the preceding claims, characterized in that the return stroke of the points e uT »ri ^T after trimming the first edge is equal to d - - r ~ , corrected by the distance between the reference line and the turning axis, where C is the final width of the sheet. 4. A method for trimming the edges of a metal sheet according to any one of the preceding claims, characterized in that the error of the edge removed from the cutting line is equal to the difference is the distances of the end point and the neighboring intermediate point from the reference line. 409818/0921 5 - Procedure for trimming the edges of a sheet according to one of the preceding claims, characterized in that the error of the edge adjacent to the cutting line is equal to that of the reference line from the measured difference between the distance of an end point when the edge near the scissors passes through the Perpendicular in the final reference track and the distance in the passage this same edge through the perpendicular to the adjacent intermediate reference point is. 6. Procedure for trimming the edges of a sheet one of the preceding claims, characterized in that the distance between the cutting line and the reference line is zero. 7. Means for trimming the edges of a sheet metal, thereby marked that it contains the following parts: - an edge scissors (7), - A roller table (8) arranged next to the scissors for the Transport of the sheet, 409818/0921 - at least one device for moving the sheet transversely to the cutting direction (11, 12, 15, 18, 21, 22, 25, 28, etc.), - A device (14) arranged in front of the scissors for turning the sheet metal after cutting the first edge, and - Means for driving this device. 8 “Device for trimming the edges of a sheet metal according to Claim 7, characterized in that each of the devices for Moving the sheet includes the following parts: - A slide (11; 21; 31; 41) guided perpendicular to the cutting line, - a device arranged at the scissor-side end of each carriage for gripping an edge of the sheet (12; 22; 32; 42), and - Drive devices (15, 18, 161; 25, 28, 261; etc.) for rectilinear Movement of the slide in both directions. 9. Device for trimming the edges of a sheet metal one of claims 7 and 8, characterized in that it contains the following parts: 409818/0921 - Feelers (19; 29; 39-49), which control the passage of the cutting line Feel the facing sheet metal edge and one of them in the shift direction one carriage each (11-21; 31; 41) in the same Is arranged at a distance from the cutting line, - Feelers (131; 231; 331; 431), which are located at the end of the Gripping devices of the carriage are arranged and of the scherenfemen Sheet edge are operated to control the advance of the carriage and gripping devices, and - Baits (17; 27; 37; 47) which determine the position of these antennae (131 etc.) Specify relative to the cutting line. »10. Device for trimming the edges of a sheet metal according to claim 9, characterized in that it contains: - An automatic sequence control unit (6) for controlling the Motors of the roller table, the scissors and the turning device, - a digital control unit (5) that controls the setting of the slide (11; 21 etc.) depending on the signals of the bait (17; 27 etc.) and on the final width of the sheet causes and the Cuts the sheet according to the method of one of claims 1-6. 409818/0921 11. Device for automatic trimming of the edges of a Sheet metal according to claim 7, characterized in that the turning device (14) contains several horizontal arms (142), which is in its lowest position in the roller table. Insert (8) and each of which is rigidly connected to a component (carriage 141) which is adjustable in height and at its end with a device (144) is provided for detecting the sheet to be turned. 12. Device for automatic trimming of the edges of a Sheet metal according to one of Claims 7 and 8, characterized in that the roller table (8) contains rollers (83) which lead to the cutting line allow vertical displacement of the sheet and in the vertical direction between an altitude which is lower than the table (8) is, and an altitude which is higher than the table is, can be moved, and that the gripping devices (12; 22, etc.) are movable in the vertical direction. 409818/0921 ORJGfNAL INSPECTED