DE102006031890B4 - Device for accurate cutting of bar sections and method for determining the impact energy - Google Patents

Abstract

Device for the precise cutting to length of bar sections, consisting of a semi-finished product cutting unit and an electronic load cell that detects the weight of the cut-off bar section and is connected to a computer, characterized in that the semi-finished product cutting unit (1) consists of a cutting press that is operated by a torque motor (4) is driven, which mutually engages a striking mass of a percussion hammer (5), and a cutting tool (6) is arranged at each end of the swiveling range of the percussion hammer (5), being fastened on a tool plate (7) in parallel between two sides Bearing blocks (8) a shear rocker (9) is articulated with a shear bushing (10), and the swiveling range of the shear rocker (9) on the front end face (11) is limited by an upper fixed stop (16) and a lower fixed stop (12) ; and the shear bushing (10) in the shear rocker (9) is coaxially aligned with a fixed shear bushing (17) in the opposite bearing block (8), and by compression springs (19) arranged between the tool plate (7) and the shear rocker (9) and by a pneumatic cylinder (20) which is attached to the tool plate (7) on the rear end face (21) of the shear rocker (9) and whose piston rod (22) is guided in an elongated hole (23) of the shear rocker (9) is held, the pneumatic cylinder (20) being pressurized on the lower piston side (24) and the upper piston ring surface (25) being connected by means of a quick exhaust valve, and a striking head on the shear rocker arm (9) perpendicularly above the shear bushing (10) (26) for the percussion hammer (5) for introducing the required impact energy for severing the rod section, and the lower fixed stop (12) has a through hole (27) which is in operation b the semi-finished product cutting unit (1) is positively closed by a rod (28) and is used to determine the impact energy generated when the through hole (27) is open, ...

Description

The invention relates to a device for accurate cutting to length of rod sections, consisting of a semi-finished cutting unit and the weight of the cut rod section detecting electronic load cell, which is connected to a computer and a method for determining the impact energy.

Out DE 102 17 026 C1 a cutting device which can be used in high-speed cutting machines is known, with which a greater cutting speed can be achieved via a gear means.

In the prior art devices and methods for determining the impact energy are known. Such a device without cutting press is in DE 33 00 324 C2 described.

From the DE 2608551 A1 are known a method and a device for producing weight- or volume-precise semi-finished products, in particular billet sections for cold or hot deformation, wherein the device consists of a longitudinal stop-bearing bridge on two guides which are connected in parallel to the semifinished product moving device with a semifinished section cutter, wherein the Bridge is displaceable by a servomotor via a threaded spindle relative to the guides and are provided with clamping devices for clamping the bridge with the guides in the respective Abscherstellung, wherein a computer is connected with its output device to the clamping devices to this shortly before moving the bridge through to release the servomotor or jam after adjustment. In the computer, the cross-sectional dimensions and the target weight of the semifinished product section and the specific weight of the workpiece material can be entered, and by an in each case the weight of the directly previously sheared semifinished product section detecting electronic load cell, which is connected via an analog-to-digital converter to the input device of the computer, whose output is connected to the actuator of the length stop. This invention no longer meets the productivity requirements of producing large amounts of bar sections per unit time with the smoothest and most perpendicular interface possible on the bar sections.

The DE 10 2004 043 189 B3 shows a cutting press with a drive consisting of an NC-controlled torque motor, which alternately brings the striking mass for cutting bar sections, and in each case a cutting tool is arranged in the pivoting area of the striking mass. This almost doubles the productivity of the cutting press. The diameter and bar material determine the required impact energy for the separation process. If there is an oversizing of the impact energy, the cutting press tends to self-destruct.

The object of the invention is to develop a device for accurate cutting to length of rod sections, consisting of a semi-finished cutting unit and the weight of the cut rod section detecting electronic load cell, which is connected to a computer, which has a high productivity and does not tend to self-destruction. It is also an object of the invention to provide a method for determining the impact energy for such a device.

According to the invention, these objects are achieved by a device for accurate cutting to length of rod sections with the features of claim 1 or by a method for determining the impact energy with the features of claim 4.

It is expedient that the rod length measuring unit consists of a working cylinder, whose piston rod carries a slidable on a guide measuring system slider, which moves the rod against the lowered shank of the shear rocker, and determined by the Messsystemsgleiter the rod length computer controlled. It is advantageous that the rod feed unit consists of a movable on a frame parallel to the ablated rod, computer-controlled linear unit with a gripper for the rod, from the weight specification of the rod section and the continuous length correction from the mass balance of the previous cut rod section, the target section length determined as the travel path for the linear unit in the computer and the current rod length is tracked to determine from the ultimately determined remaining piece length of the rod the required travel of the linear unit for the first target section length of the next bar.

The invention will be explained in more detail with reference to an embodiment. In the accompanying drawing show

1 FIG. 3: an overall view of a device for cutting bars into pieces by weight,

2 a semi-finished cutting unit,

3 : a shearbar in longitudinal section,

4 : a sectional view of a lower fixed stop after 3 .

5 : the lower limit stop after 4 with a stamp,

6 a frame with a rod length measuring unit,

7 a sectional view of a bar feeder unit with a semi-finished cutting unit and a sorting unit, and

8th : a load cell with the sorting unit

The 1 shows an overall view of a device for accurate cutting of bar sections, consisting of a semi-finished cutting unit 1 , a rod length measuring unit 30 , a bar feeder unit 32 , a sorting unit 40 and a calculator. According to 2 consists of the semi-finished cutting unit 1 from a cutting press, through an NC-controlled torque motor 4 is driven, the blow of a hammer blower 5 mutually engaged, and at the ends of the pivoting area of the percussion mass ever a cutting tool 6 is arranged, on both sides between two parallel side by side on a tool plate 7 fixed bearing blocks 8th one scissor swing each 9 with a shear bush 10 is articulated. To the shearer wings 9 are each sufficient for a blown-air discharge pipe 33 for the cut-to-length rod sections, that of an electronically controlled load cell 38 with an adjoining sorting unit 4 be supplied. How out 3 can be seen, is a pivoting range of the shear rocker 9 at the front end 11 through an upper fixed stop 16 and by a lower hard stop 12 limited. Is the shearer swinging 9 at the upper fixed stop 16 on, is the shear bush 10 the shearbar 9 coaxial with a fixed shear sleeve 17 in the opposite bearing block 8th aligned. By compression springs 19 between the tool plate 7 and the shearer swing 9 are arranged, and by a pneumatic cylinder 20 on the back end 21 the shearbar 9 by means of a piston rod 22 in a slot 23 the shearbar 9 is arranged guided, is the shear swing 9 at the upper fixed stop 16 at. In this position is the pneumatic cylinder 20 on the lower side of the piston 24 pressurized, and the upper piston ring surface 25 by means of a quick exhaust valve, which is not shown in the drawing, connected. On the swingarm 9 is perpendicular above the shear bush 10 a blow head 26 for the hammer 5 arranged. The lower hard stop 12 according to 4 a through hole 27 on during operation of the semifinished cutting unit 1 through a pole 28 is positively closed, and with open through hole 27 serves to determine the generated impact energy. To measure the impact energy is a stamp 29 , which is connected to a force-measuring device, in the open through-bore 27 pressed in (see 5 ). From the press-in force and the press-in depth of the punch 29 into the through hole 27 the impact energy is determined, the impact mass of the percussion hammer used 5 and the speed of the percussion hammer 5 when hitting the blow head 26 produce. As with changes in the rod material and / or change in the rod diameter of the rods 31 de de required impact energy for cutting the rod 31 also changed, the impact energy is to adapt to these requirements. By changing the mass of the percussion hammer 5 and / or changing the impact velocity of the percussion hammer 5 on the blow head 26 For example, the impact energy of the cutting energy required to separate the rod 31 be adjusted. The residual energy may only be so small that no further cutting movement is generated. This prevents that the semi-finished cutting unit 1 self-destructed and the two shear sockets 10 . 17 jammed together by generated sections. Before the cutting process, the rod length is to be determined. This is done via a rod length measuring unit 30 , This consists according to 6 from a working cylinder 48 , its piston rod 49 , one on a guided tour 50 moveable measuring system glider 51 carries the rod 31 against the lowered shear bush 10 the shearbar 9 moves and determines the rod length, taking on a rack 44 pads 45 for a guided tour 47 the pole 31 and stakeout positions 52 for different rod length groups for oriented reception of the rod length measuring unit 30 by means of a stakeout 46 are attached. In the 7 illustrated rod feed unit 32 consists of one on a rack 55 parallel to the rod to be cut 31 mobile, computer-aided linear unit 54 with a gripper 53 for the bars 31 , wherein the travel of the linear unit 54 the target section length of the rod section is the computer 3 determined from the weight specification of the rod section to be cut and the continuous length correction from the mass balance of the previous cut-to-length rod section. The leftovers of the bars 31 after the cutting tool 6 removed via a line, not shown. According to 1 connects to each of the two cutting tools 6 a discharge pipe 33 with Belasluftförderung for the cut rod sections. Each of the two discharge pipes 33 directs the bar sections according to 7 to a photocell 34 for acknowledging the entry of a rod section into a socket 35 a partial wheel 36 , The partial wheel 36 is according to 8th rotatable by 360 degrees and has two 180 degrees vertically opposed chambers 37 on, which are each provided with a damping element, not shown, for reducing the settling time of the introduced rod portion. Under the part wheel 36 is an electronic load cell 38 arranged that from the 180 degrees rotated chamber 37 picking up falling rod section and detecting its weight. The weight becomes the calculator 3 fed, which determines the desired Abschittslänge and the current bar length tracked to from the ultimately determined remaining length of the rod 31 the required travel of the linear unit 54 for the first target cutoff length of the next following bar 31 to investigate. The weighed bar sections are placed in a sorting unit 40 according to 8th promoted. The sorting unit 40 consists of two slides 42 . 43 and a switch 41 , which due to the mass balancing the rod sections in the chute 42 for quality and in the chute 43 for non-quality bar sections passes.

LIST OF REFERENCE NUMBERS

1

Semi-finished cutting unit

3

computer

4

torque motor

5

hammer

6

cutting equipment

7

tool plate

8th

bearing blocks

9

shear rocker

10

shear connector

11

front end

12

lower hard stop

16

upper hard stop

17

shear connector

19

compression springs

20

pneumatic cylinder

21

rear end face

22

piston rod

23

Long hole

24

lower piston side

25

upper piston ring surface

26

impact head

27

Through Hole

28

pole

29

stamp

30

Rod length measurement unit

31

pole

32

Bar feed unit

33

discharge pipe

34

photocell

35

Support

36

partial gear

37

chambers

38

load cell

40

sorting unit

41

switch

42

slide

43

slide

44

frame

45

pads

46

Abstecker

47

guide

48

working cylinder

49

piston rod

50

guide

51

Measuring system glides

52

Set out

53

grab

54

linear unit

55

frame

Claims (4)

Device for accurately cutting lengths of bar sections, consisting of a semifinished cutting unit and a weight of the cut rod section detecting electronic load cell, which is connected to a computer, characterized in that the semifinished cutting unit ( 1 ) consists of a cutting press, which by a torque motor ( 4 ), which is a striking mass of a percussion hammer ( 5 ) mutually engaged, and at the two ends of the pivoting range of the percussion hammer ( 5 ) one cutting tool each ( 6 ) is arranged, on both sides between two parallel side by side on a tool plate ( 7 ) fixed bearing blocks ( 8th ) a shearbar ( 9 ) with a shear bushing ( 10 ) is hinged, and the pivoting range of the shear rocker ( 9 ) at the front end ( 11 ) by an upper fixed stop ( 16 ) and by a lower fixed stop ( 12 ) is limited; and the shear bush ( 10 ) in the shearbar ( 9 ) with a fixed shear bushing ( 17 ) in the opposite bearing block ( 8th ) is aligned coaxially, and by compression springs ( 19 ) between the tool plate ( 7 ) and the shearbar ( 9 ) are arranged, and by a pneumatic cylinder ( 20 ), on the rear side ( 21 ) the shearbar ( 9 ) on the tool plate ( 7 ) and its piston rod ( 22 ) in a slot ( 23 ) the shearbar ( 9 ), is held, wherein the pneumatic cylinder ( 20 ) on the lower piston side ( 24 ) is pressurized, and the upper piston ring surface ( 25 ) is connected by means of a quick exhaust valve, and on the shear rocker ( 9 ) vertically above the shear sleeve ( 10 ) a striking head ( 26 ) for the hammer ( 5 ) is arranged to introduce the required impact energy for the separation of the rod portion, and the lower fixed stop ( 12 ) a through hole ( 27 ), which in operation of the semifinished cutting unit ( 1 ) by a rod ( 28 ) is positively closed and with open through-hole ( 27 ) is used to determine the generated impact energy, and on a rack ( 44 ) Pads ( 45 ) for a guided tour ( 47 ) of the rods ( 31 ) as well as stake out positions ( 52 ) for different rod length groups of rods ( 31 ) are mounted, the stakeout positions ( 52 ) for oriented reception of a rod length measuring unit ( 30 ), and by means of Bar length measuring unit ( 30 ) the length of the inserted rod ( 31 ), as well as via the computer ( 3 ) the desired section length of the rod section as the travel of a linear unit ( 54 ) for a subsequent bar feeder unit ( 32 ), and the rod ( 31 ) by the calculated travel through the opened cutting tool ( 6 ) by means of the rod feed unit ( 32 ), and to each of the two cutting tools ( 6 ) an exhaust pipe ( 33 ) with Blasluftförderung for the resulting rod sections and at the end of each discharge pipe ( 33 ) a light barrier ( 34 ) for acknowledging the entry of a rod section into a socket ( 35 ) of a partial wheel ( 36 ), wherein the partial wheel ( 36 ) is rotatable by 360 degrees and two 180 degrees vertically opposed chambers ( 37 ), which are each provided with a damping element for reducing the settling time of the introduced rod portion, and under the Teilrad ( 36 ) the electronic load cell ( 38 ) is arranged, which from the rotated 180 degrees chamber ( 37 ) receives falling bar section and the determined weight of the computer ( 3 ), which determines a continuous correction of the nominal section length from a mass balancing and tracks the current bar length and the weighed bar section into a computer-controlled sorting device ( 40 ), which consists of a switch ( 41 ) for two slides ( 42 . 43 ), which due to the mass balancing the rod sections in the chute ( 42 ) for quality and into the chute ( 43 ) for non-quality bar sections. Device according to claim 1, characterized in that the rod length measurement unit ( 30 ) from a working cylinder ( 48 ) whose piston rod ( 49 ) one on a guided tour ( 50 ) movable measuring system sliders ( 51 ) carrying the rod ( 31 ) against the lowered shear bushing ( 10 ) the shearbar ( 9 ), and via the measuring system slider ( 51 ) determines the rod length computer controlled. Device according to claim 1, characterized in that the rod feed unit ( 32 ) from one on a rack ( 52 ) parallel to the rod to be cut ( 31 ) movable, computer-controlled linear unit ( 54 ) with a gripper ( 53 ) for the rod ( 31 ), wherein from the weight specification of the rod section to be cut and the continuous length correction from the mass balance of the previous cut-to-length rod section, the desired section length as the travel path for the linear unit ( 54 ) in the computer ( 3 ) and the current rod length is tracked to determine from the ultimately determined remaining length of the rod ( 31 ) the required travel of the linear unit ( 54 ) for the first nominal section length of the next following bar ( 31 ) to investigate. Method for determining the impact energy, characterized in that a stamp ( 29 ), which is connected to a force measuring device, upon impact of a percussion hammer ( 5 ) on a percussion head ( 26 ) the shearbar ( 9 ) in a through hole ( 27 ) is pressed, and the impact energy is determined from the Einpresstiefe and the measured press-in force.

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