US3893357A - Process for cutting reinforcing steel bars for steel concrete and a bar cutting machine for effecting the process - Google Patents

Process for cutting reinforcing steel bars for steel concrete and a bar cutting machine for effecting the process Download PDF

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US3893357A
US3893357A US38052473A US3893357A US 3893357 A US3893357 A US 3893357A US 38052473 A US38052473 A US 38052473A US 3893357 A US3893357 A US 3893357A
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bars
pressure
cutting machine
machine according
blade
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English (en)
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Helmut Zahlaus
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Priority claimed from DE19722235120 external-priority patent/DE2235120C3/de
Priority claimed from DE19732330496 external-priority patent/DE2330496A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/28—Associations of cutting devices therewith
    • B21D43/285—Devices for handling elongated articles, e.g. bars, tubes or profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F23/00—Feeding wire in wire-working machines or apparatus
    • B21F23/005—Feeding discrete lengths of wire or rod
    • B21F23/007—Feeding discrete lengths of wire or rod using pick-up means, e.g. for isolating a predefined number of wires from a bundle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D15/00—Shearing machines or shearing devices cutting by blades which move parallel to themselves
    • B23D15/04—Shearing machines or shearing devices cutting by blades which move parallel to themselves having only one moving blade
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D33/00—Accessories for shearing machines or shearing devices
    • B23D33/10—Stops for positioning work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2022—Initiated by means responsive to product or work
    • Y10T83/2024—Responsive to work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2074—Including means to divert one portion of product from another
    • Y10T83/2083—Deflecting guide
    • Y10T83/2085—Positionable gate in product flow path
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/4458—Work-sensing means to control work-moving or work-stopping means
    • Y10T83/446—With means to initiate tool feed by same control impulse
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/4463—Work-sensing means to initiate tool feed
    • Y10T83/4465—With work-stopping abutment in sensing means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/4475—Tool has motion additional to cutting stroke during tool cycle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/444—Tool engages work during dwell of intermittent workfeed
    • Y10T83/4637—With means to guide, position, or present work to work-feed means
    • Y10T83/464—Means to transport work to work-feed means
    • Y10T83/4642—Including means to pick articles from pack or stack
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8748—Tool displaceable to inactive position [e.g., for work loading]
    • Y10T83/8749—By pivotal motion

Definitions

  • the present invention relates to a process for cutting reinforcing steel bars for steel concrete, wherein the bar material is conveyed from the crude steel storage area via a bar cutting machine and is prepared before the cutting process.
  • the invention further relates to a bar cutting machine for effecting the process.
  • This machine comprises a conveying and drawing frame secured to the base frame which is made of structural steel and is laterally movable by means of wheels.
  • This cutting machine is further provided with a conveying and cutting unit and a longitudinally displaceable measuring device.
  • Bar cutting machines of this type are used, in particular, for cutting to size reinforcing steel bars for steel concrete. These machines form part of a full steel concrete processing plant.
  • the steel bars to be cut are conveyed via the bar cutting machine from the crude steel storage area to the cut-steel area, and the bars to be bent are conveyed via the bending machine to the storage area for the finished reinforcing steel bars.
  • the known bar cutting machines are provided with a drawing or conveying device, which, in several successive operating stages, transports the material from the crude steel storage area, in the form of bundles, and prepares it for the cutting process.
  • Complete reinforcing steel items are prepared on the bar cutting machine, which is in the form of a cutting and measuring carriage. These items can subsequently undergo further processing.
  • Bar cutting machines generally require two operators.
  • the first operator forms the reinforcing steel bars to be cut into a bundle in the storage area, ready to be transported by the conveying device, while the second operator starts the conveying device and the cutting machine and places the individual steel bars from the bundle against a limiting stop.
  • the bundle must be rendered more compact by urging it against the limiting stop.
  • fairly considerable variations in the lengths of the bars in a bundle can still occur. Only then can the prepared material be manually moved laterally into the cutting jaws. After cutting a limited number of bars the size of the cutting jaws determining the exact number of bars, the device must be cleared in a longitudinal direction, so that the next cutting operation can begin.
  • the object of the present invention is to provide a process which makes it possible to achieve a comparable or increased throughput when cutting bars individually or in pairs over cutting bars in bundles, by increasing the conveying and cutting rate through a constant supply of material and wherein, after being placed in the insertion device, the bars are automatically moved forwards, measured into varying lengths, cut, sorted, counted, and placed in position for further conveyance.
  • this problem is solved in that the reinforcing bars conveyed individually or in pairs to the insertion device of the bar cutting machine are automatically moved on by this machine and by impinging on a displaceable stop are kept at adjustable lengths, without the reinforcing bars springing back, and in that the steel bars being moved up, are brought up over the bars which have been cut, immediately after the cutting operation, and further in that the regulation of the lengths of the bars, the counting, sorting of the cut bars according to their length, and the positioning of the bars so that they can be transported further, is program controlled.
  • the arresting of the movable upper blade of the cutting device and the releasing of the same for the cutting operation is preferably effected by means of electrical signals released when the bars being conveyed further trip a switching flap.
  • the movable upper blade of the cutting device is preferably swung in the direction of movement of the steel bars by the bars themselves as they are moved forwards after the cutting operation.
  • the bar cutting machine for cutting the reinforcing steel bars according to the above-described process is characterized in that the conveying and cutting unit, which is built at the from over the base frame, is provided at its lower part with driven conveyor rollers and at its upper part with pressure loaded pressure rollers, of which the front pressure roller is adapted to be released and adjusted either manually or automatically and in synchronism with the cutting operation of a vertically guided blade. In its lowered position, this blade is designed to be tilted by the forward movement of the bar material immediately after removal of the cutting pressure.
  • An insertion device is advantageously provided for the manual or mechanical insertion of one or two bars into the conveying and cutting unit.
  • a switching cone which, on the introduction of the insertion device, releases the lowering movement of the front pressure roller onto the bars to be cut and the pressing of this pressure roller against the constantly rotating conveyor rollers which convey the bars to the blade.
  • the conveyor rollers are advanta geously provided with a concave groove adapted to receive two bars. In this way. the bars are pressed against each other and onto the conveyor rollers in an even manner, thus ensuring that they are moved in synchronism, that is, without any mutual longitudinal displacement.
  • one or more longitudinally displaceable measuring devices and a longitudinally displaceable end measuring unit with end buffers for measuring varying lengths of bar material are further provided according to the invention.
  • An impulse generator which may be programmed, controls the arresting of the buffer stop of the measuring device and the operating position of a turnover grid for sorting the cut material according to its length.
  • the main advantages provided by the invention are that a single operator is responsible for supplying the reinforcing steel bars from the storage pile to the conveying device, which is also designed to convey the bars further. so that an additional drawing device is not required.
  • a further advantage is that, on account of the fact that only one or two bars are conveyed and cut at one time, the conveyor belt and the machine can be designed to receive far smaller loads than when the bars are cut in bundles. As the bars can be kept at the correct length by means of a buffer stop, which intercepts any impact, and by means of the front pressure roller which prevents the bars from springing back, no variation in the length of the measured steel bars occurs.
  • a particular advantage of the invention is provided by the upper blade which is adapted to be tilted forwards in the direction of travel of the steel bars. This enables the steel bars being moved up to be brought up over the cut bars immediately after the cutting operation and even before the blade has returned to its upper starting position.
  • a further advantage is that the bars can be counted and sorted automatically and the individual bar or pair of bars can be cut without considerable wastage of material.
  • FIG. I is a diagrammatic, partial sectional view of a steel bar cutting machine with a conveying and carrying frame and measuring devices for measuring the lengths of the steel bars
  • FIG. la is a diagrammatic view of the dials of an impulse generator of the cutting machine
  • FIG. 2 is a plan view of the machine according to FIG. 1,
  • FIG. 3 is a diagrammatic, sectional, detailed view of the insertion device which is introduced into the con veying and cutting unit,
  • FIG. 4 is the insertion device according to FIG. 3 shown in full
  • FIGS. 5a and 5b are views of an upper tiltable blade and a lower stationary blade during or immediately after the cutting operation
  • FIGS. 6a and 6b are views of the left and right positions of a turnover grid of the cutting machine along the cutting line 1-1.
  • a conveying and cutting unit 12 of a steel bar cutting machine 10 is built over the base frame and projects over the reinforcing steel bars stacked in a crude steel pile 14.
  • the conveying and cutting unit 12 is provided with constantly rotating conveyor rollers I8, 20, which are arranged in the lower part of the carrying frame and which are driven by an endlessly circulating chain 22.
  • a drive motor 26 is provided for the chain 22.
  • the driving pinion 24 of the motor 26 is in engagement with the chain 22.
  • Another pinion 28 ensures the necessary stressing of the chain 22.
  • the conveyor rollers I8, 20, rotate constantly and transport one or two bars I6, which are held against the conveyor rollers 18, 20, by pressure rollers 30 and 40, in the direction of an upper, tiltable blade 52 which cooperates with a lower stationary blade 50.
  • the blade 52 forms the upper blade support for the cutting of the bars 16.
  • This upper blade support is adapted to swivel about the swivel axis 56.
  • the lower blade 50 forms the lower blade support for cutting the bars.
  • the pressure rollers 30, 40 are arranged in the upper part of the conveying and cutting unit 12.
  • the front roller 30 is displaceable and is adapted to be released either manually or automatically and in synchronism with the cutting operation effected by the vertically guided blade 52.
  • pressure cylinders 32, 36, and 34 are provided. These are supplied with pressure by a pump unit 42 arranged in the lower part of the conveying and cutting unit 12.
  • the pump unit 42 consists of a motor 46 with a driven plate 48 and a pump 42.
  • the driven plate 48 serves as an energy storage means for the cutting energy to be applied.
  • the pump unit 42 is connected to the pressure cylinders 32, 36, and the pressure cylinder 54 for the activation of the blade 52 via a pressure switch 34 which may, for example, consist of a hydraulic switching valve in the form of a multi-way magnetic valve.
  • a hinged lever 37 which is pivotably mounted about a central axis, leads from the pressure cylinder 32 to the from pressure roller 30.
  • the pressure cylinder 32 is connected via a forward and return flow pressure line with the pressure switch 34, so that, during operation of the pump unit 42, pressure may be applied to or removed from the from pressure roller 30, depending on the adjustment of the pressure switch 34.
  • the rear pressure roller 40 which is always adjustably pressure loaded during the operation of the pump unit 42, is hinged to the pressure cylinder 36 by way of an angle lever 38 which is rotatable about an axis.
  • the cylinder 36 is connected to the pressure switch 34 by way of a single pressure line, so that, during operation of the pump unit 42, the pressure engaged in this line remains constant. As a result, the rear pressure roller 40 rests with constant pressure against the bars 16 and prevents the bars 16 from recoiling from a buffer stop 60 or 76.
  • An insertion device 17 (FIGS. 3 and 4), which is manually or mechanically introduced into and removed from the conveying and cutting unit 12, is provided for the insertion of the bars into the conveying and cutting unit 12.
  • a switching cone I5 is rigidly secured to the insertion device 17.
  • This switching element 15 activates a switching contact 13 and thus activates a switching signal for the pressure switch 34.
  • This pressure switch 34 acts on the pressure cylinder 32 for the front pressure roller which is in turn lowered onto the bars 16 to be cut.
  • This pressure roller 30 then presses the bars against the constantly rotating conveyor rollers 18. 20, which transport the bars 16 to the tiltable blade 52.
  • the insertion device 17 is constructed in stages and is provided with a contact surface 19 for the bars 16.
  • the contact surface 19 projects out of the conveying and cutting unit 12 so that two bars 16 can be laid thereon.
  • pressure is removed from the from pressure roller 30 which then rises, owing to the fact that the switching cone 15 is separated from the switching contact 13.
  • the two bars which have been loaded, fall onto a rail 21 arranged at the level of the concave groove 23 of the rollers 18, 20.
  • the insertion device 17 can subsequently by reintroduced, whereupon the bars 16 are pushed from the rail 21 onto the conveyor rollers 18, 20.
  • the drive parts of the conveying and cutting unit 12 are encased in removable housing parts.
  • the cutting pressure of the blade 52 is zero and its arresting force is removed, so that the bars 16 which are being moved in a forward direction, are able to turn the blade 52 about a transverse axis of tilt 56.
  • This axis of tilt 56 is displaced about the distance a with respect to its cutting edge.
  • the arresting of the blade 52 and its release after the cutting operation are controlled by electrical signals of one or more measuring devices 58 or of an end measuring unit 74. These measuring devices activate the pressure switches 34 to engage or disconnect the pressure cylinder 54 for the blade 52.
  • One or more longitudinally displaceable measuring devices 58 are arranged along and above the conveying and carrying frame in a measuring channel provided with a drop bottom 92.
  • the measuring device 58 consists of a sliding carriage 62 longitudinally displaceable in a measuring channel, a spring plate 80 for inserting the bars 16 into the measuring device, a switching flap 66 connected to a switch 68, and a buffer stop 60 rotatable about a transverse axis.
  • This buffer stop 60 is connected to a comparably sized, longitudinally displaceable counterweight 70 via a return spring 69.
  • This counterweight 70 receives the force of the impact when the bars 16 strike against the buffer stop 60, and is displaced in the direction of the arrow (see FIG. 1) [n the vertical position, the rotatable switching flap 66 projects as far as the proximity of the drop bottom 92 of the measuring channel and is rotated by the bars 16, which strike against it.
  • the switch 68 which is connected to the switching flap 66 is thereby activated, thus engaging or disconnecting the pressure cylinder 54 via the pressure switch 34.
  • An electromagnet 64 is provided on the sliding carriage 62. This electromagnet 64 is engaged or disconnected in accordance with the selected program via an impulse generator 86 mounted on the conveying and cutting unit 12. When the electromagnet 64 is engaged. the buffer stop 60 is locked in striking position for the bars 16. As soon as the bars 16 touch the switching flap 66, the pressure cylinder 54, and thus the blade 52, are activated via the switch 68, thus initiating the cutting operation.
  • a camber and pivot inclination is provided from the switching flap 66 to the buffer stop 60, to cater to the inertia of the regulating system.
  • the overall weight of the sliding carriage is such that a violent blow on the buffer stop 60 cannot raise the sliding carriage 62.
  • only one measuring device 58 and one end measuring unit 74 are provided with a buffer stop 76. Further measuring devices can be arranged as required between the first measuring device 58 and the end unit 74. These will also be provided with an impulse generator.
  • the end measuring unit 74 consists of a longitudinally displaceable sliding carriage 78, the spring plate for inserting the bars, the switching flap 66, which activates the switch 68, and the buffer stop 76, which is rigidly secured to the sliding carriage 78, and which is connected to the comparably sized, longitudinally displaceable counterweight 70.
  • the sliding carriage of the measuring units 58, 74 are displaceable along a measuring channel which guides the bars 16 up to impact.
  • the measuring channel On its underside, the measuring channel is provided with the multi-sectional drop bottom 92 which is controlled on a time-delay principle with the commencement of the cutting operation and which releases the bars 16 at the bottom after the cutting process.
  • a turnover grid 84 for sorting the cut bars is provided below the measuring channel.
  • the turnover grid 84 is controlled by a cylinder controlled by the inpulse generator 86.
  • the impulse generator 86 is provided with decade counters 88.
  • the turnover grid 84 adopts various positions and divides the cutting material according to length in accordance with a recorded program of the impulse generator 86. The cutting material which is sorted in this way is loaded on the lower conveyor belt to be transported further.
  • the bar cutting machine operates as follows:
  • the insertion device 17 When the insertion device 17 is in the inserted position, two bars 16 are placed on the surface 19. When the insertion device is moved in the direction of the arrow in FIG. 3, the two bars 16 fall onto the rail 21. The pressure is removed from the pressure roller 30, which is then raised. When the insertion device 17 is again moved inwards, the bars 16 are moved from the rail 21 into the concave groove 23 of the conveyor rollers 18, 20. During this process, the switching cone 15 which is rigidly mounted on the insertion device 17, triggers the switching contact 13 which lowers the front pressure roller 30 via the pressure switch 34. The front pressure roller 30 presses the two bars 16 against the constantly rotating conveyor rollers 18, 20.
  • the two bars are pressed against each other and are thus pressed against the conveyor rollers 18, 20, in an even manner. In this way, they are moved against the tiltable blade 52 in parallel.
  • the cutting process is commenced by the blade 52.
  • the insertion device [7 is moved outwards in the direction of the arrow according to FIG. 3. As a result, the front pressure roller 30 is raised in the manner described above. and the two bars 16 fall onto the rail 21 and can be pushed onto the conveyor rollers 18, 20.
  • the tiltable blade 52 is first raised so that the bars pass through the cutting device.
  • the measuring device 58 and the end measuring unit 74 are controlled in such a manner that the longer pieces are cut from the bars 16 and then the shorter pieces.
  • the bars 16 strike against the rotatable buffer stop 60 of the first or successive measuring unit 58. If the programmed length of the pieces cut from the bars 16 is not yet reached, the buffer stop 60 is not arrested, so that it is rotated about its transverse axis by the bars 16 striking against it, and the bars are able to pass beneath it.
  • the relevant switch 68 is activated.
  • This switch 68 transmits a control signal to the pressure switch 34, whereupon pressure is exerted on the blade 52 by the pressure cylinder 54, and the blade is lowered to begin the cutting operation.
  • the blade 52 is rotated about its axis 56 by the forward moving bars 16 which strike against the blade 52.
  • the bars l6 are moved forwards until they encounter the measuring device 58 disposed in its operating position. In this position, the buffer stop 60 is blocked by the magnet 64.
  • the switching flap 66 activates the switch 68, which initiates another cutting operation.
  • the tiltable blade 52 makes it possible for one or two bars to be conveyed in a continuous manner to the indididual measuring devices 58. As a result, the cutting process can be effected considerably more rapidly than with known machines.
  • the turnover grid 84 is moved into its right or left operating position by the impulse generator 86 in accordance with the adjusted cutting lengths for the bars. in this way, the cutting material can be sorted according to length along both sides of the conveyor belt.
  • a steel bar cutting machine for cutting reinforcing steel bars for concrete steel including a conveying and carrying frame, secured to a base frame which is made of structural steel and is laterally displaceable and further including a conveying and cutting unit and a longitudinally displaceable measuring device, the improvements comprising:
  • a conveying and cutting unit (12) which is built over the base frame, having driven conveyor rollers (18, at its lower part and pressure loaded pressure rollers (30, 40) at its upper part, one of said pressure rollers being adapted to be released and adjusted automatically and in synchronism with the cutting operation of a vertically guided blade;
  • a vertically reciprocable blade support having an upper cutting blade pivotally attached thereto;
  • a bar cutting machine characterized in that an insertion device (17) is provided for the mechanical insertion of a pair of bars (16) into the conveying and cutting unit (12), and that attached to said insertion device (17) is a switching cone (15) which, on the inward movement of the insertion device (17) triggers the lowering movement of the pressure roller (30) onto the bars (16) to be cut and its action of pressing the bars 16) against the constantly rotating conveyor rollers (18, 20) which move the bars (16) forwards to the blade (52).
  • a bar cutting machine characterized in that when the insertion device (17) is moved inwards, the switching cone (l5) activates a switching contact (13) which lowers the front pressure roller (30) via a pressure switch (34) and causes said roller (30) to be pressed against the bars (16) in the groove of the conveyor rollers (18, 20).
  • a bar cutting machine characterized in that the insertion device (17) is constructed in stages and is provided with a contact surface (19) for the bars (16).
  • a bar cutting machine characterized in that a rail (21) is arranged adjacent to the insertion device (17) at the level of the concave groove (23) of the conveyor rollers (18, 20).
  • a bar cutting machine characterized in that one or more longitudinally displaceable measuring devices (58) and a longitudinally displaceable end measuring unit (74) provided with buffer stops (60 and 76) are provided for the measurement of bars pieces of varying lengths, and in that a programmable impulse generator (86) controls the arresting of the buffer stop (60) of the measuring device (58) and the operating positions of a turnover grid (84) for sorting the cut bar pieces according to length.
  • a bar cutting machine characterized in that the measuring device consists of a sliding carriage (62) displaceable along the measuring channel, said sliding carriage comprising a spring plate (80), a switching flap (66) activating a switch (68) and an angular buffer stop (60) rotatable about a transverse axis, said buffer stop (60) being connected to a comparably sized and longitudinally displaceable counterweight (70) via a return spring (69).
  • a bar cutting machine characterized in that the switch (68) is connected to the pressure switch (34) for the activation of the cylinder (54) of the tiltable blade (52).
  • a bar cutting machine characterized in that an electromagnet (64) is provided on the sliding carriage (62) to arrest the buffer stop (60) in its striking position for the bar 16), said electromagnet (64) engaging and disconnecting the impulse generator (86) according to the selected program.
  • a bar cutting machine characterized in that the turnover grid (84) is disposed below the measuring channel and by moving this into different positions in accordance with the program of the impulse generator (86), short and long bar pieces (72 and 82) can be placed apart from each other on each side of the lower conveyor belt.
  • a bar cutting machine characterized in that one or measuring devices (58) and the end measuring unit (74) are displaceably arranged along and above the conveying and carrying frame in a measuring channel with a drop bottom (92).
  • a bar cutting machine characterized in that the drop bottom (92) is multisectional and, on opening, releases the cut steel bars from below, in the direction of the turnover grid (84).
  • a bar cutting machine characterized in that the conveyor rollers (18, are provided with a concave groove (23) for receiving a pair of bars (l6).
  • a bar cutting machine charactcrized in that the pivoting axis (56) of the upper blade (52) is displaced laterally by a distance a with respect to its cutting edge.
  • a bar cutting machine characterized in that a pump unit (42) consisting of a motor (46) with a rotary plate (48) provided for the pump (44) and arranged in the lower part of the conveying and cutting unit (12) applies pressure via the pressure switch (34) to a pressure cylinder (32, 36) for the pressure rollers (30 and 40) and to a pressure cylinder (54) for activating the blade (52) which is vertically guided against the stationary blade (50) in the lower part of unit (12).
  • a pump unit (42) consisting of a motor (46) with a rotary plate (48) provided for the pump (44) and arranged in the lower part of the conveying and cutting unit (12) applies pressure via the pressure switch (34) to a pressure cylinder (32, 36) for the pressure rollers (30 and 40) and to a pressure cylinder (54) for activating the blade (52) which is vertically guided against the stationary blade (50) in the lower part of unit (12).
  • a bar cutting machine characterized in that a multi-way magnetic valve constitutes the pressure switch (34).
  • a bar cutting machine characterized in that the pressure cylinder (36) which is connected to the pressure switch (34) by a single pressure line. and from which pressure cannot be removed during the operation of the pump unit (42). is connected to the rear pressure roller (40) by an angle lever (38) rotatable about an axis.
  • a bar cutting machine characterized in that the from pressure roller (30) is connected to the pressure cylinder (32) via a lever (37) rotatable about an axis. said pressure cylinder (32) having pressure applied thereto or removed therefrom. either manually or automatically, by way of a forward and return flow pressure line to the pressure switch (34). during the operation of the pump unit (42).
  • a bar cutting machine characterized in that a sliding carriage (78) of the end measuring unit (74) is provided with a buffer stop (60), a spring plate and the switching flap (66) activating the switch (68), which is connected to the pressure switch (34).
US38052473 1972-07-18 1973-07-18 Process for cutting reinforcing steel bars for steel concrete and a bar cutting machine for effecting the process Expired - Lifetime US3893357A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19722235120 DE2235120C3 (de) 1972-07-18 1972-07-18 Stabschneidemaschine zum automatischen Zuschneiden von Bewehrungsstählen
DE19732330496 DE2330496A1 (de) 1973-06-15 1973-06-15 Stabschneidemaschine

Publications (1)

Publication Number Publication Date
US3893357A true US3893357A (en) 1975-07-08

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US38052473 Expired - Lifetime US3893357A (en) 1972-07-18 1973-07-18 Process for cutting reinforcing steel bars for steel concrete and a bar cutting machine for effecting the process

Country Status (9)

Country Link
US (1) US3893357A (sv)
JP (1) JPS545550B2 (sv)
AT (1) AT327648B (sv)
AU (1) AU473358B2 (sv)
CH (1) CH568809A5 (sv)
FR (1) FR2192888B1 (sv)
GB (1) GB1442683A (sv)
IT (1) IT992627B (sv)
SE (1) SE387263B (sv)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4106380A (en) * 1977-05-09 1978-08-15 Potomac Applied Mechanics, Inc. Angle iron cutting
US4524656A (en) * 1982-09-27 1985-06-25 Sae S.R.L. Method for cutting metal rods into shorter lengths
US4527452A (en) * 1983-04-19 1985-07-09 Lindner Karl Rainer Cutting device for cutting elongated profiles into sections
WO2010040820A1 (en) * 2008-10-10 2010-04-15 M.E.P. Macchine Elettroniche Piegatrici Spa Feed device for metal bars, and relative feed method
CN104084682A (zh) * 2014-06-26 2014-10-08 常熟市非凡金属制品有限公司 钢圆棒断料机的推料机构
US20140356104A1 (en) * 2011-12-23 2014-12-04 M.E.P. Macchine Elettroniche Piegatrici Spa Apparatus to Feed Metal Products to a Work Machine and Corresponding Method
CN105522075A (zh) * 2016-01-14 2016-04-27 建科机械（天津）股份有限公司 盾构管片单片网内弧钢筋和外弧钢筋的牵引装置
CN108213280A (zh) * 2018-03-12 2018-06-29 刘爱华 一种建筑用钢筋切断装置
CN114798744A (zh) * 2022-05-20 2022-07-29 宝武集团鄂城钢铁有限公司 棒材双收集防追尾系统和方法
US20230029802A1 (en) * 2019-12-27 2023-02-02 Amada Co., Ltd. Cutting machine and cutting method
USD1012142S1 (en) 2022-01-28 2024-01-23 Milwaukee Electric Tool Corporation Strut shearing die
USD1016111S1 (en) 2022-01-28 2024-02-27 Milwaukee Electric Tool Corporation Strut shearing die

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5319889U (sv) * 1976-07-30 1978-02-20
US4488464A (en) * 1983-03-28 1984-12-18 Frito-Lay, Inc. Device for cutting continuous logs of dough
FR2559409A1 (fr) * 1984-02-13 1985-08-16 Clairvaux Forges Cisaille a ebouter et a tronconner les barres sur un laminoir a chaud
FR2675065A1 (fr) * 1991-04-15 1992-10-16 Chemical Paul Procede et installation de coupe de barres metalliques.
DE60118485T2 (de) * 2000-08-29 2006-09-14 Oscam S.P.A. Vorrichtung zum Ablängen von Metallstäben inbesondere für Betonbewehrungsstahl

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US1784556A (en) * 1927-04-06 1930-12-09 American Rolling Mill Co Automatic shears
US2351868A (en) * 1941-11-21 1944-06-20 Morgan Construction Co Shear
US3038362A (en) * 1958-05-26 1962-06-12 Coors Porcelain Co Metal bar shears
US3244047A (en) * 1963-11-01 1966-04-05 Mcinnis Conveyors Ltd Stock locating and severing device
US3245299A (en) * 1964-04-09 1966-04-12 Morgan Construction Co Back shear table gauge
US3370494A (en) * 1967-01-24 1968-02-27 Kroy Company Shear line assembly
US3466958A (en) * 1967-02-16 1969-09-16 Westinghouse Electric Corp Material cutting control system providing reduced material wastage
US3522750A (en) * 1967-11-17 1970-08-04 Servicemaster Ind Systems Co Automatic cutting machine

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Publication number Priority date Publication date Assignee Title
US1784556A (en) * 1927-04-06 1930-12-09 American Rolling Mill Co Automatic shears
US2351868A (en) * 1941-11-21 1944-06-20 Morgan Construction Co Shear
US3038362A (en) * 1958-05-26 1962-06-12 Coors Porcelain Co Metal bar shears
US3244047A (en) * 1963-11-01 1966-04-05 Mcinnis Conveyors Ltd Stock locating and severing device
US3245299A (en) * 1964-04-09 1966-04-12 Morgan Construction Co Back shear table gauge
US3370494A (en) * 1967-01-24 1968-02-27 Kroy Company Shear line assembly
US3466958A (en) * 1967-02-16 1969-09-16 Westinghouse Electric Corp Material cutting control system providing reduced material wastage
US3522750A (en) * 1967-11-17 1970-08-04 Servicemaster Ind Systems Co Automatic cutting machine

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4106380A (en) * 1977-05-09 1978-08-15 Potomac Applied Mechanics, Inc. Angle iron cutting
US4524656A (en) * 1982-09-27 1985-06-25 Sae S.R.L. Method for cutting metal rods into shorter lengths
US4527452A (en) * 1983-04-19 1985-07-09 Lindner Karl Rainer Cutting device for cutting elongated profiles into sections
WO2010040820A1 (en) * 2008-10-10 2010-04-15 M.E.P. Macchine Elettroniche Piegatrici Spa Feed device for metal bars, and relative feed method
US9452466B2 (en) * 2011-12-23 2016-09-27 M.E.P. Macchine Elettroniche Piegatrici Spa Apparatus to feed metal products to a work machine and corresponding method
US20140356104A1 (en) * 2011-12-23 2014-12-04 M.E.P. Macchine Elettroniche Piegatrici Spa Apparatus to Feed Metal Products to a Work Machine and Corresponding Method
CN104084682B (zh) * 2014-06-26 2016-02-17 常熟市非凡金属制品有限公司 钢圆棒断料机的推料机构
CN104084682A (zh) * 2014-06-26 2014-10-08 常熟市非凡金属制品有限公司 钢圆棒断料机的推料机构
CN105522075A (zh) * 2016-01-14 2016-04-27 建科机械（天津）股份有限公司 盾构管片单片网内弧钢筋和外弧钢筋的牵引装置
CN108213280A (zh) * 2018-03-12 2018-06-29 刘爱华 一种建筑用钢筋切断装置
US20230029802A1 (en) * 2019-12-27 2023-02-02 Amada Co., Ltd. Cutting machine and cutting method
USD1012142S1 (en) 2022-01-28 2024-01-23 Milwaukee Electric Tool Corporation Strut shearing die
USD1016111S1 (en) 2022-01-28 2024-02-27 Milwaukee Electric Tool Corporation Strut shearing die
CN114798744A (zh) * 2022-05-20 2022-07-29 宝武集团鄂城钢铁有限公司 棒材双收集防追尾系统和方法

Also Published As

Publication number Publication date
FR2192888A1 (sv) 1974-02-15
AU5819073A (en) 1975-01-30
ATA578873A (de) 1975-04-15
JPS545550B2 (sv) 1979-03-17
CH568809A5 (sv) 1975-11-14
AU473358B2 (en) 1976-06-17
GB1442683A (en) 1976-07-14
FR2192888B1 (sv) 1977-05-13
AT327648B (de) 1976-02-10
IT992627B (it) 1975-09-30
SE387263B (sv) 1976-09-06
JPS4952387A (sv) 1974-05-21

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