DE2335966A1 - METHOD AND DEVICE FOR SLITTING METAL STRIPS - Google Patents

Description

COMAlCO (J. & S.) PKT. Limited 2335968

95 Collins Street

Melbourne (State of Victoria)

Australia

A 33 729

Method and device for slitting metal strips

The invention "relates to a method and an apparatus for Slitting of strip material and is applicable, but not limited to, slitting of a metal section between flanges before pulling these flanges apart to form a grid, a sieve surface or another metal link »

Is is already known to produce expanded metal, with a Sheet metal first in a series of staggered individual shear lines. is slit and then stretched, compare in particular US-PS 885 548, where a metal cutting ~ and -forming machine is described, which is suitable for the production of expanded metal by first slitting a sheet metal and dary after being pulled apart at the edges to form the expanded metal. This publication, which is the closest version

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The technique includes a series of shear rollers each of which has a series of radial projections extending around the roller over parts of its circumference "

According to the previous methods and devices for the production of plate or strip-shaped material for production of expanded metal plates, the shear lines represent simple shear lines and end in sharp edges, which are strain concentration zones form at the ends of the slots when the metal is stretched. Hence the metal is considered non-load bearing Plate suitable, but not as a load-bearing plate. Also, known methods and apparatus for forming the slots prior to stretching a metal plate underneath Use of rotating shear members sharp-edged tools that are effective as rotating cutters, with the already mentioned in the introduction mentioned document Hesserenden are provided on opposite edges of the rotating shear elements, so that each knife simultaneously creates two slots in the panel being processed. The amount of force required to The effect of a slit in the plate-shaped material is very small compared to the force required to effect it the formation of slits in strip-shaped material the same thickness. If, for example, the knives described in the publication are used as slotted rollers, then so if the rollers were not suitable for transporting the material to be slit through the cutting zone, so that the material would be destroyed by the roller stamp.

The object of the invention is to provide an element for piercing longitudinally extending slots, wherein the Strip material in which these slots are to be formed is not significantly damaged by the slot rollers, wherein furthermore the slot length can be changed easily without changing the slot rollers, and with the in strip-shaped

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The slits formed by the material have neatly cut ends. which can be bow-shaped, for example, so that the development of zones of strain concentration is greatly reduced when the material is formed into an expanded metal member will. This is of great importance if the total length of the strip-shaped material cannot be reduced, when expansion occurs, expansion is taken up by expansion of the metal between adjacent slots.

According to the invention, a strip-shaped material with a constant cross-sectional shape, which represents the workpiece, is transported through a cutting zone between counter-pressure members and a plurality of slotted rollers, each of which has a radial projection extending around the same, which extends around part, but not the full, circumference extends, at the same time the slotted rollers are driven at a speed that is set synchronized to the speed of the transport elements, which transport the strip along the rollers.By driving the strip over the rollers with transport elements and simultaneous separate drive of the rollers along with a carefully adjusted speed it becomes possible to obtain a very clean cut at the ends of the slots, so that again the build-up of strain concentration areas (associated with sharp-ended slots or those with rough or burr cuts) is substantially reduced, w hen the strip material is expanded. '

In particular, \ mt aasen compositions of the invention for the production of longitudinally extending slots in strip material of constant cross-sectional shape of a frame, a pair of aligned and the part of the frame recorded stock, a number of coaxial slitter in mounting between the bearings and rotatably receiving therein itself, each slot

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roller has at least one radial projection which extends around the roller over j; a part, but not over the entire circumference, extends, counter-pressure members at a distance from the rollers, but next to them in order to form a cutting zone together with the rollers, transport elements received by the frame, drive elements in coupling with the rollers for the rotatable drive of the same and others Drive elements in coupling with your Transporteleraent to drive the same in a direction at right angles to the roller axis, in such a design and arrangement that the material strip when supported on the Ge ^ ΰ :: ν. ".: · Αΐο1: ^ ϋcd ccitreur. of the transport element is driven through the cutting zone, while at the same time the slotted rollers are driven to rotate and the Yorsprtinge on the slotted rollers produce perforations on the strip by shearing in order to form the slots.

The inventive method can be used as a method of production longitudinal slots can be defined in strip material of constant cross-sectional shape and includes the following Measures: Drive the strip in the direction of its longitudinal axis and at right angles to the axis of a row of coaxial Slot rollers and through a cutting zone between the rollers and the counter pressure member, each of the slot rollers at least has a radial projection extending around it over part, but not all, of its periphery runs, and simultaneous rotary drive of the slotted rollers to the projections for cutting openings in the To cause strip material and make slits in the strip material.

Appropriately, the ends of the projection are curved so that that the slots have curved ends, 'control elements are between the corresponding drive elements of the transport element and the slotted rollers inserted so that the rotary

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numbers are adjustable. If the transport element is set so ' that it is the strip-shaped workpiece at a higher Transported speed than it would otherwise be moved by the rollers, the ends of the slot turn out to be separated as satiber, with a minimum of material resistance, so that the formation of stress concentration is reduced.

The invention is explained in more detail below with reference to the drawings. Show it:

1 elements for slitting strip-shaped material in a schematic representation of the slotted rollers of the counter-pressure member as well as the transport element,

Fig. 2 shows the slotted rollers and the counter-pressure member in an enlarged schematic sectional view,

Pig. 3 the machine according to the invention at the location of the cutting zone in a book-piece plan view,

3? Ig. 4 dr-äi elements of a series of slotted rollers, viz a slotted roller, a spacer element and a stripping plate, in an exploded perspective view,

Fig. 5 shows a series of slotted rollers on a shaft for storage between a pair of spindles on the machine, im Longitudinal section,

Figure 6 shows the cutting zone and the relationship between the slitting rollers as well as a counter pressure roller, in an enlarged sectional view,

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Pig. 7 shows an embodiment of a slotted roller in an enlarged side view,

Pig. 8 is a half section along line 8-8 of Pig. 7 »

Pig. 9 shows an embodiment of a counter-pressure roller in longitudinal section,

Pig, 10 an embodiment of an optional one Hold-down roller in a partially schematic representation,

Pig. 11 an exemplary embodiment of an auxiliary table to be used optionally in a perspective view,

Pig. 12 embodiments of control elements used to effect des.Antriebs to the slotted rollers as well as to the Transport element, in a schematic representation.

According to the drawing, a machine 20 comprises an inlet-side roller housing 21 and an outlet-side roller housing 22. Each roller housing 21, 22 can be adjusted in height by means of adjusting devices 23 (Pig stands. In this exemplary embodiment, only the adjacent ends of corresponding roller housings 21, 22 are adjustable in height, since the extent of the adjustment required is relatively small. The other ends are provided with hinge support elements (not shown).

The roller housing 21 on the inlet side is provided with a plurality of rollers 28, each of which is seated on a corresponding shaft 29, the shafts being supported in bearings 30. The rollers are arranged on corresponding shafts 29 at an axial distance ι a transport chain 31 is between the rollers

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attached claws 32 arranged, line claw 32 is here against one end of a strip-shaped workpiece 33 according to Pig. 2 to the workpiece 33 through a cutting zone to drive, which is present between a die pressure roller 35 and a series of slot rollers 36. On the exit side of the In the cutting zone 34, a hold-down roller 37 is also provided, which assists in reducing the distortion of the workpiece after cutting.

The training dor slotted rollers 36 is the best from Pig. 4-8. Each slotted roller 36 has a central one Opening 41 provided with an arrow 42 over a spring 43 is held in engagement. Each roller is also provided with six bolt holes 44 which receive bolts 45; through this it is possible to build up a stack of slotted rollers 36. Each slot roller 36 is provided with a pair of radial gate projections 46, which are, however, held at a distance by recessed sections 47. At least a radial one Protrusion 46 is present, the number of protrusions being determined by the length and the pitch of the slots, how ' this is necessary in the strip-shaped workpiece 33. Corresponding ones are located between adjacent rollers 36 Spacers 49; each spacer 49 is of a Surrounding stripper plate 50, the effect of which is to provide a To avoid distortion of the workpiece when cutting, the stripper plates 50 lightly against the upper surfaces of the corresponding beads 51 rest on the strip-shaped workpiece 33 (FIG. 9). To continue to avoid distortion, the outer unifang areas of the radial projections 46 are knurled, as illustrated in FIG. This latter feature is optional and will not be used in every embodiment used.

The bolts 45 rest against the end plates 53 (Fig. 5),

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these in turn being held between annular seals 54 which surround the shaft 42 and bear at one end against a shoulder 55; at the other end will be the Elements held by a spindle nut 56, the ends of the shaft 42 containing corresponding recesses 53, 59? in both cases the depressions have beveled surfaces; the recess 59 is cut by a transverse slot 60. In this case, the shaft 42 can be positioned between a driven spindle at one end and a running spindle be stored at the other end, while the stripping plates on the shaft 42 form a single arrangement according to FIG. 5, which enables a quick change when changing tools when the slot formation is to be changed. to For this purpose, the tool equipment on the machine is in the attached in essentially the same way as a milling tool attached to a milling machine. The shaft can have projections, the spindles being provided with recesses could be.

Fig. 6 shows details of the operation of the slitter The axis of Gegondruckrolle 35 was offset from the inlet side of the IDbene which is perpendicular to the Iangsach.se the strip-shaped workpiece 33, the center of the cutting zone 34 is ^{substantially:;} upstream of this plane and is provided with the reference numeral 66 in FIG. The cutting zone 34 is defined in the present case as part of the web which is subjected to a shearing action when the rollers 36 rotate. The pitch cutting speed of each roller is defined herein as the linear speed of the part of the roller which is tangential to the central plane of the workpiece.

According to FIGS. 7, 8, the ends of the radial projections 46 end

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in radially extending curved surfaces 67> the side surfaces of the projections 46 are undercut to provide a rake or to create a cutting game 68 according to FIG. 8 * This reduces the adverse effects on the canton of the metal, if there is a shear in the workpiece »

To different cutting diameters or different Record heights of the beads 51 in different workpieces, it is necessary to adjust the position of the counter pressure roller 35 in the forward and backward directions} to this For this purpose, the counterfuck roller 35 is accommodated (not shown) bearings, which are arranged in bearing blocks 70f from the For the same reason, the bearings (not shown) in which the shaft 42 is supported are vertically adjustable and are shown in FIG Bearing blocks added, which are vertically "movable" by slides 71 are performed. Corresponding screw members 72, 73 effect the settings.

Fig. 9 shows the cross-sectional shape of the counter-pressure roller 35, which comprises several ring-shaped members 75 on a shaft 76 ι the shaft 76 has a similar shape to the shaft 42 and is again with a shoulder 77 at one end, a spindle nut 78 at the other end and corresponding recesses 79 _f 80 provided, said recess 79 is cut by a transverse slot 81st With this arrangement, the assembly of components including the slotted rollers 36 and the assembly of components including the spacers 75 can be made or repaired as a pair of mating workpieces and also retained as such.

It is not only necessary to have the slotted rollers and the counter pressure rollers to change if a workpiece with a different cross-sectional configuration is to be slotted, but you have to

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in many cases also the hold-down roller 37 in the assembly change. This can be accomplished in any known manner, 10 shows a simple mechanism in which an air cylinder 84 is coupled to an arm 85, which is hinged to a support 86,

which extends upward from the G-frame, the coupling by means of a toggle-shaped lever 87 and a coupling member 88 is effected. The support 86 is provided with slots 89 which support a block 90, which in turn is a Shaft 91 is supported, the toggle levers 87 being attached to the part 91 are. Thus, the block 90 can be in an upper position for high flanges or beads and in a lower position be arranged for low flanges or beads. Similarly, the slots 93 provide adjustment elements for the Pin 94 about which arm 85 can be pivoted.

If a thin-walled workpiece is to be slotted which can be damaged by the application of the counter-pressure roller 35 , the workpiece is conveniently arranged on a table 96 of FIG to support the slot rollers 36 while the lower surface of the table is provided with a chain 98 attached thereto which acts as a rack; the chain 98 can be identical to the transport chain 31 in terms of its dimensions and shape. Therefore, an operation of the sprocket wheel 99 which drives the chain 31 also causes the chain 98 to be driven and moves the table 96 below the slotted rollers 36, in this FIG ^. all the table 96 becomes a transport element for the purpose of transporting the workpiece below the slotted rollers. The workpiece is held by a stop rail 100 attached to the upper surface of the table 96.

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Pig. 12 shows schematically the drive element, including a Electric motor 105 has a pump 106 that draws oil from a reservoir

107 pulls, drives and pressurizes the oil through a control valve

108 promotes, which in turn drives a hydraulic motor 109, which causes the drive of the shaft 42 by means of a drive chain 110. The shaft 42 is coupled via a drive 112 with a variable transmission ratio to a pair of speed generators 113, the speed generators a direct current motor 114 via a direct current - Control the feedback control unit 115, which regulates the speed of the motor 114 to which the second speed generator 113 is coupled. The motor 114 drives the platen roller 35 via a chain drive 116 and drives the sprocket 99 of the conveyor chain 31 through a clutch 117 in Figure 12, In this embodiment, be used as a speed generators 113 such that trademarks under the ^¥;:. Morse "series Fik the company Borg Earner International Corporation, Chicago, Illinois sold \ r LOC.-jn "the speed generator has the type number 5PT and ζ a-KK-Steuerun-2000 MK coupled type, with a 20 hp DC motor (MC DC motor), part number 2000 DP 230 or optionally 2000 TE 230. All of these products interact with one another and are all marketed by Borg Warner International Corporation under the trademark ^:! Morse ^{: l} .

In operation, the machine is actuated by first using an adapted pair of tools, namely an arrangement including a series of slotted rollers 36 arranged on a shaft and a corresponding series of annular ones Links 75 deployed in arrangement on shaft 76 are v / ground. By virtue of a corresponding arrangement in their respective positions on the machine by motors 109 and 114, respectively.

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The controller 115 is set so that the speed eggs Transport chain 31 (or optionally the table 96) is the same as the Pitch cutting speed of the rollers 36 or slightly greater. The amount of the difference can be set by the controller 115, the operator using his or her experience in adjusting the difference (if any). The slot length and the quality of the cut can be controlled by changing the speed of the motor 114.

A workpiece is either attached to the table 96 (if this is to be used) or optionally above the chain 31 arranged so that this end is gripped by the pawl 32. An impulse is picked up by a separate sensing element, whereby this acts on the electrical coupling 117 ^ the electrical coupling 117 remains energized until the workpiece has completed its transverse movement through the cutting zone 34.

In this embodiment, the sensing element is a magnet coupled to the shaft 42, with a proximity switch in this case is operated. This is not shown; optional sensing elements can be used instead. However that is Fully adjustable sensor switch to create elements to compensate for the starting torques, which deal with workpieces of different Change weights.

The moment at which the clutch 117 is applied determines the Relationship between the slots and the end of the workpiece. The mechanism for achieving this is state-of-the-art of the art and does not form part of the present invention. After the workpiece has been guided across the machine, the break-out pieces are removed from the machine and the workpiece is removed from the roller housing 22 on the outlet side. The workpiece is then stretched by stretching the

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Metal stretched between the formed slots.

The cross-sectional shape of the workpiece can "vary considerably change that illustrated in Fig. 9, but in all cases it will be found that beads 51 are used v / ground to avoid the need for concave shapes when removing broken pieces from the workpiece path should be to form the slots therein.

The preceding description was directed to a machine with the slotted rollers arranged above the workpiece are. However, the arrangement can also be converted so that the counter-pressure rollers are provided above the workpiece while the slotted rollers are underneath. This arrangement results in ejection of the broken pieces onto the Workpiece to support the removal of the waste.

In the embodiment described, both the feed chain and the counter-pressure roller transmitted an internal drive on the workpiece. However, it is not always necessary to use both of these drives; e3 can also only be used a drive applied as a transport element in cases where the workpiece does not place heavy cutting loads on the slotted rollers. However, in all cases both the workpiece as well as the slotted rollers are driven.

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Claims (18)

Claims 1.! Procedure for making longitudinal slots in > - 'Strip material of constant cross-section, marked by driving the strip in the longitudinal axis direction and perpendicular to the axis of a row of coaxial Slotted rolls and through a cutting zone between the rolls as well as G-egendruckeleaenten, each slotted roll has at least one radial projection which extends around the same over a part, but not over the whole Circumference, extends, and simultaneous drive of the slotted rollers in the direction of rotation, the projections for Shearing off fragments from the strip material are arranged to form the slits in the strip material. 2. The method according to claim 1, characterized in that the rollers with the same pitch cutting speed how the strip will be driven. 3. The method according to any one of claims 1, 2, characterized in that that the rollers are driven at a lower pitch cutting speed than the strip. 4. The method according to any one of claims 1-3 _f, characterized in that the drive of the strips is effected by gripping one end of the Streifons with a claw on a transport chain and that the transport chain is driven by an electric motor. - 15 309886/0865 5. The method according to any one of claims 1-3, characterized in that that the drive of the strip takes place by fastening it to a table and that the table through an electric motor is driven. 6 «Method according to one of claims 4, 5, characterized in that that the electric motor is a direct current motor with variable speed and that the speed of this Ilotors by means of a speed generator is controlled, which is driven with the slotted rollers and electrically with is coupled to the electric motor via a circuit which is a closed-loop DC control element contains. 7. Device for performing the method according to one of the Claims 1-6, characterized by a group of coaxial slotted rollers (36) which have at least one radial projection have, which extends around a part of the rollers, but not over? (Counter pressure roller 35) at a distance from the rollers and in an arrangement adjacent to this, which together form a cutting zone with the rollers, transport elements, which are held by a frame, drive elements in coupling with the rollers for rotatably driving the same and by drive elements in coupling with the transport elements for driving the same, with the ability corresponding Structure and corresponding arrangement of the material strips when placed on the counter-pressure element by means of the Transport element is driven through the cutting zone, while at the same time the slotted rollers are driven to rotate with the protrusions shearing off fragments on the strip to form the slots. - 16 - 309886/0865 8. Apparatus according to claim 7, characterized in that the frame has two pairs of vertical carriages, wherein the bearings Tertikai are movably guided accordingly between the slides of these pairs, and that threaded elements intended to connect the bearings and the g-part are which adjusting elements for height adjustment form the camp, 9. Device according to one of claims 7 or 8, characterized in that the G-pressure elements a counter-pressure roller include, which are stored in roller bearings i '^ t which are attached to the frame. 10. The device according to claim 9, characterized by threaded members for coupling the roller bearings and the frame, with position adjustment elements being formed for the counter-pressure roller to adjust the position of the counter pressure roller in the direction of the longitudinal axis of the strip material. 11. Device according to one of claims 9 or 10, characterized characterized in that each of the back pressure rollers and the series of caster rollers have a shaft, a shoulder on one End of the shaft, a series of annular spacers surrounding the shaft, clamping elements for clamping the annular spacing elements opposite the shoulder and include a conical recess in each end of each respective shaft. 12. Device according to one of claims 7-11, characterized in that an inlet-side roller housing is held by the frame and extends in a direction opposite the cutting zone, and that an outlet-side roller housing extends in the opposite direction therefrom. - 17 309886/0865 13. Device according to. Claim 12, characterized by height adjustment elements between each reel housing and the frame. 14. Device according to one of claims 7-13, characterized in that that each end of the slotted roller radial projection terminates in a curved surface which extends in the radial direction. 15. Device according to one of claims 7-14, characterized in that that the slots of each of the slot roller radial projections are progressive in thickness radially inwardly from the Reduce the circumference to create a "cutting game". 16. Device according to one of claims 7-15, characterized by stripping plates between adjacent slotted rollers, which abut against a surface of the strip material when the slots have been formed therein. 17 «Device according to one of claims 12, 13, characterized by a hold-down roller above the outlet-side roller housing to rest against the upper surface of the workpiece on the outlet side of the cutting zone, 18. Device according to one of claims 7-17, characterized in that that the drive element is a hydraulic motor in coupling with the roller shaft, a speed generator in coupling with the roller shaft, a DC motor in coupling with the transport element and an electrical circuit for connecting the speed generator ors and the DC motor. 309886/0865