US20150217358A1 - Device for Joining Flat Metal Products Passing Successively Into a Strip Processing Plant - Google Patents

Device for Joining Flat Metal Products Passing Successively Into a Strip Processing Plant Download PDF

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Publication number
US20150217358A1
US20150217358A1 US14/426,017 US201414426017A US2015217358A1 US 20150217358 A1 US20150217358 A1 US 20150217358A1 US 201414426017 A US201414426017 A US 201414426017A US 2015217358 A1 US2015217358 A1 US 2015217358A1
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US
United States
Prior art keywords
cutting
punches
punch
gap
transverse direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/426,017
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English (en)
Inventor
Patrick Störmer
Klaus Boguslawsky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz Metals Germany GmbH
Original Assignee
Andritz Sundwig GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andritz Sundwig GmbH filed Critical Andritz Sundwig GmbH
Assigned to ANDRITZ SUNDWIG GMBH reassignment ANDRITZ SUNDWIG GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOGUSLAWSKY, KLAUS, STÖRMER, Patrick
Publication of US20150217358A1 publication Critical patent/US20150217358A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/001—Shaping combined with punching, e.g. stamping and perforating
    • 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
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/24—Transferring coils to or from winding apparatus or to or from operative position therein; Preventing uncoiling during transfer
    • B21C47/247—Joining wire or band ends
    • 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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
    • B21D39/031—Joining superposed plates by locally deforming without slitting or piercing
    • 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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
    • B21D39/035—Joining superposed plates by slitting
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49915—Overedge assembling of seated part
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49936—Surface interlocking
    • 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53709—Overedge assembling 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53996—Means to assemble or disassemble by deforming

Definitions

  • the invention relates to a device for joining metal strips passing successively into a strip processing plant.
  • This type of device usually comprises at least two cutting punches.
  • the cutting punches each have at least one cutting edge which is associated with a cutting edge of the respective other cutting punch.
  • at least one of the punches can be moved in a cutting motion along a cutting axis towards the respective other punch.
  • the metal strips to be joined together are then connected by making, in one step, at least one cut in two superimposed end portions of the metal strips and then deforming a region of the end portions which adjoins the cut such that an undetachable join is produced between the flat products.
  • the cutting procedure takes place in a cutting gap which, when the cutting edges meet at the same height with respect to the cutting axis during the cutting motion thereof is delimited by the cutting edges such that it extends in a direction oriented transversely to the cutting axis and occupies a gap width in a width direction which is respectively oriented at a right angle to the transverse direction and to the cutting axis.
  • the strip material processed in a device according to the invention typically consists of a metal material such as normal steel, stainless steel, aluminium material or other non-ferrous metal materials.
  • Devices of the type according to the invention are used in processing plants in which the metal strips are subjected to a heat treatment or surface treatment, passing continuously through the treatments, for example.
  • the metal strips usually supplied as coils, are unwound, they pass through the processing plant and are finally rewound into coils in a coiling station located at the end of the processing plant.
  • the coiling station and driver stations optionally provided in the processing plant are configured such that they pull the metal strips through the processing plant.
  • the end of the metal strip being processed in the processing plant is firmly joined with the beginning of a newly delivered coil which is ready to be processed.
  • the strip being processed then pulls the new strip into the processing plant until it has reached the coiling station.
  • the strips are separated and the new strip is wound into a new coil.
  • the prerequisite for a new strip being reliably drawn into the strip processing plant is a join between the beginning of a strip and the end of a strip, which join also withstands high tensile loads. At the same time, the join has to be produced during operation, i.e. fast enough so that the strip run is not disturbed.
  • the strips to be joined together are arranged such that their mutually associated end portions overlap in devices of the type concerned here.
  • a joining procedure is carried out in which a locally limited deformation of the end portions is produced by the effect of force against at least one of the broad sides of the strips.
  • the join produced thus is made non-positively or positively in the manner of a punch join, in which cuts or perforations are made in the superimposed strip portions.
  • the regions of the strips adjoining the perforation or the respective cut are deformed such that the metal sheets hook into each other. If necessary, this hooking procedure can be reinforced in a further processing step to ensure that the join produced thus withstands the forces arising during the subsequent processing of the joined strips.
  • Devices which perform this procedure are therefore also known in the technical jargon as “tack punching devices”.
  • the cut required to produce a tack-punch join is performed by the cutting edges, moved relative to one another of punching tools, at least one of which is movable towards the respective other along a cutting axis.
  • the accuracy with which the cutting punches make the cut substantially depends on the distance between the cutting edges at the time of cutting, i.e. on the width of the cutting gap at the time when the cutting edges of the tools meet one another at the same height.
  • the more precisely the cutting gap also known as “clearance” in the technical jargon, is adjusted to the thickness of the metal strips to be joined together, the better the cutting result. If the width of the cutting gap is too big, then pinching effects and thereby undesirable edge formation ensues in the region of the cuts.
  • the object of the invention was to provide a device, using which metal strips which are to be drawn into a strip processing plant, can be joined together in an operationally reliable manner with a minimum amount of flitter being produced.
  • the invention achieves this object by the configuration, stated in claim 1 , of a device for joining two metal strips.
  • the cutting punches are movable towards one another along a cutting axis in a cutting motion in order to make at least one cut in two superimposed end portions of the metal strips to be joined together and to deform a region, adjoining the cut, of the end portions such that an undetachable join is produced between the metal strips.
  • the cutting punches When their cutting edges meet at the same height in respect of the cutting axis during the cutting motion, the cutting punches define with their cutting edges a cutting gap which extends in a direction transverse to the cutting axis and occupies a gap width in a width direction oriented at a right angle to the transverse direction and to the cutting axis.
  • the cutting edges, defining the respective cutting gap, of the cutting punches include an acute angle with the transverse direction of the cutting gap, viewed from the cutting direction.
  • the cutting punches can be moved relative to one another in the transverse direction of the cutting gap to change the gap width.
  • an adjusting means is thus provided by which at least one of the tools provided for making the cut in the strips to be joined together can be moved in a direction transverse to the cutting direction in order to adjust the clearance.
  • each cutting punch of a device according to the invention can have a plurality of cutting edges arranged next to one another in the width direction.
  • each cutting edge of one cutting punch is associated with a cutting edge of the other cutting punch.
  • the punches then mesh together in the manner of teeth so that a cut is simultaneously made in the strips to be joined together at a number of cutting points corresponding to the cutting edges of each of the cutting punches.
  • each of the cutting punches has a plurality of cutting edges
  • the cutting edges of the respective punch can be oriented parallel to one another in each case.
  • the cuts made in the metal strips are then accordingly oriented parallel to one another, obliquely to the longitudinal extent of the metal strips.
  • the tendency to form hooking effects can be further increased in the region of the joins formed by a device according to the invention in that provided on the cutting punches is a respective cutting edge which is divided in each case by an offset into at least two cutting edge portions which are joined by a connecting portion and are oriented in a mutually offset manner in the width direction of the cutting gap.
  • the cutting edges, provided with the offset cutting edge portions, of the cutting punches are naturally associated with one another to ensure a correct cutting procedure with an optimised cutting gap width. Offsetting the cutting edge portions produces a shoulder on the cutting edges of the superimposed metal strips.
  • a simple adaptation to different processing conditions or a simple replacement in the case of wear can be allowed in that cutting punch elements supporting the cutting edges of the respective cutting punch are held in a releasable manner.
  • the displacement provided according to the invention for adjusting the cutting gap width can be carried out in any suitable manner. This can be performed in a particularly practice-oriented manner when at least the cutting punch is mounted displaceably in the transverse direction and when an adjusting means is provided to move this punch.
  • This adjusting means can also be realised in any suitable manner, for example by hydraulic adjusting cylinders.
  • a particularly robust adjusting means which, at the same time, is economical to produce, for moving the respective cutting punch is produced when the adjusting means is formed by a wedge element which can be moved in its longitudinal direction and the longitudinal sides of which include between them an acute angle and the associated punch is supported on one longitudinal side thereof, while the wedge element is supported by its remote longitudinal side on a support means mounted in a stationary manner.
  • each displacement of the wedge element in the longitudinal direction thereof results in a movement, oriented transversely to this displacement, of the tool.
  • the adjustable tool can be optimally supported in that it is supported on two opposite sides by a respective wedge element, the wedge surfaces of the wedge elements being oriented parallel to one another.
  • one wedge element is arranged on one longitudinal side and the other wedge element is arranged on the longitudinal side of the cutting punch opposite the first longitudinal side in the transverse direction of the cutting gap. Since the wedge elements are each displaced in the same direction, the respective cutting punch is always guided in a clearly defined fashion between the wedge elements in the manner of a parallel guidance.
  • a configuration of the invention which is economical to produce and is at the same time practice-oriented is distinguished in that only one of the cutting punches is movable. In this case, one of the cutting punches is then fixed, based on the transverse direction of the cutting gap, while the other cutting punch is movable in the transverse direction of the cutting gap to adjust the cutting gap width.
  • a clearance of the cutting gaps is adjusted which corresponds to one twentieth to one fifth, in particular one twelfth to one eighth of the averaged thickness of the metal strips to be joined together.
  • the adjustment paths which have to be travelled subject to the angle included between the cutting edges of the cutting punches and the transverse direction are correspondingly short in order to adjust the gap width which is optimum in each case.
  • FIG. 1 is a front view of a device for joining metal strips
  • FIG. 2 is a plan view of a cutting punch used in the device according to FIG. 1 ;
  • FIG. 3 a - 3 c show the cutting punch according to FIG. 2 in three different operating positions
  • FIG. 4 shows an enlarged detail of the cutting punch according to FIG. 2 ;
  • FIG. 5 is a diagram of a strip processing plant respectively traversed by the metal strip to be processed in continuous operation.
  • the device H comprises an upper base plate 1 which is connected to a lower base plate 3 by guide columns 2 .
  • the lower base plate 3 supports a lower cutting punch 4
  • the upper base plate 1 supports an upper cutting punch 5 .
  • the cutting punches 4 , 5 each comprise a cutting punch holder 6 in which cutting punch elements 7 , 8 are held in a releasable manner by suitable screw connections.
  • FIGS. 3 a - 4 respectively only show in detail the cutting punch holder 6 of the lower punch 4 .
  • a plurality of similar cutting punch elements 7 , 8 are respectively arranged next to one another at regular intervals in the width direction B in the respective cutting punch holder 6 of the punches 4 , 5 .
  • the position of the lower cutting punch 4 acting in the manner of a bottom die, can be moved in direction Q, oriented transversely to the cutting direction S oriented vertically here, relative to the upper cutting punch 5 .
  • the transverse direction Q coincides with the longitudinal direction L and the conveying direction F of the metal strips M 1 , M 2 to be joined together in device H.
  • the lower punch 4 In order to move the lower punch 4 with respect to the upper punch 5 which is fixed in the width direction B and in the transverse direction Q, but is movable in the cutting direction S towards the lower punch 4 , the lower punch 4 has on its two opposite longitudinal sides a respective bevelled contact surface 9 , against which a respective wedge element 10 , 11 acts with a wedge surface 12 , 13 formed on its longitudinal side associated with the upper punch 5 .
  • the bevelled contact surfaces of the punch 4 and the associated, correspondingly sloping wedge surfaces of the wedge elements 10 , 11 rest closely against one another.
  • longitudinal guide bars 14 , 15 Attached to the base plate 3 , fixed to the frame of the device H, of the lower punch 4 are longitudinal guide bars 14 , 15 which are aligned parallel to one another and extend in the longitudinal direction of the wedge elements 10 , 11 , i.e. in the width direction B, oriented at a right angle to the transverse direction Q, of the lower punch 4 .
  • the longitudinal guide bars 14 , 15 serve as supports and guides for the wedge elements 10 , 11 which are supported with their longitudinal side, remote from the punch holder 6 , on the respectively associated longitudinal guide bar 14 , 15 .
  • the punch holder 6 is guided on its narrow sides by lateral transverse guide bars 16 , 17 oriented in the transverse direction Q.
  • the length of the transverse guide bars 16 , 17 is restricted such that the wedge elements 10 , 11 can be pushed in the width direction B along the longitudinal guide bars 14 , 15 beyond said longitudinal guide bars 14 , 15 .
  • the position of the lower punch 4 can be changed in the transverse direction Q relative to the upper punch 5 by moving the wedge elements 10 , 11 .
  • the wedge elements 10 , 11 are jointly moved in the direction of one lateral guide bar 16 (directional arrow P 1 )
  • the cutting punch 4 is moved out of the neutral position in which the position of its centre axis M 4 , oriented in the width direction B, coincides with the centre axis M 3 of base plate 3 ( FIG. 3 b ), in the direction of the longitudinal guide bar 14 ( FIG. 3 a ).
  • the wedge elements 10 , 11 are jointly moved in the opposite direction (directional arrow P 2 )
  • the cutting punch 4 is moved in the direction of the other longitudinal guide bar 15 ( FIG. 3 c ).
  • the cutting punch elements 7 , 8 of the punches 4 , 5 have in each case on their free end face cutting edges 18 , 19 (cutting punch elements 7 of the lower punch 4 ) and 20 , 21 (cutting punch elements 8 of the upper punch 5 ) which run towards each other in a V shape and extend in the transverse direction Q.
  • the cutting punch elements 7 , 8 associated with the upper punch 5 and the lower punch 4 are arranged alternately such that the mutually associated cutting edges 18 , 20 ; 19 , 21 of the punches are oriented parallel in each case.
  • the mutually associated cutting edges 18 - 21 define between them a respective cutting gap 22 , 23 which, seen from the cutting direction, extends in the transverse direction Q and in the width direction B, the transverse direction Q and the width direction B being located in a plane oriented normally to the cutting axis S.
  • the cutting edges 18 - 21 include with the transverse direction Q an acute angle ⁇ . Accordingly, the clearance WS of the cutting gaps 22 , 23 is the distance measured in each case as the perpendicular on the mutually associated cutting edges 18 , 20 ; 19 , 21 ( FIG. 4 ).
  • the width BS and, associated therewith, the clearance WS of the cutting gaps 22 , 23 can be adjusted simply by jointly moving the wedge elements 10 , 11 in their longitudinal direction indicated in FIG. 2 by arrows P 1 , P 2 .
  • the clearance WS is adjusted thus, for example, to one tenth of the thickness of the metal strips M 1 , M 2 to be joined together.
  • an automatic exchange of the cutting punches 4 , 5 is provided.
  • an automatic clamping of the base plates 1 and 3 is allowed.
  • a clamping bar 24 is drawn in a groove, which is T-shaped in particular, in the direction of a base frame 25 which supports the upper cutting punch 4 .
  • the clamping bar 24 can be connected to a clamping cylinder 26 by a tension bolt.
  • a compression spring relieves the clamping bar 24 , and the respective cutting punch 4 , 5 is released with its associated base plate 1 , 3 from the base frame 25 . Thereafter, the cutting punch 4 , 5 to be respectively exchanged can be transported out of the base frame 25 .
  • a drive unit 27 is used for this purpose.
  • the device H is incorporated into a strip processing plant A, through which strips pass continuously and the individual processing stations of which are schematically illustrated in FIG. 5 .
  • Processing plants of this type are also known as “conti-processing plants” in the technical jargon.
  • metal strip M 2 is fed into plant A which can be, for example, an electrolytic coating, phosphatising and chromating plant.
  • the metal strip M 2 passes into the device H in which its front end portion is positioned, overlapping, on the rear end portion of metal strip M 1 .
  • the joining procedure is carried out in which the device H, adjusted and operated in the manner described above, makes cuts in the superimposed end portions of the strips and at the same time the regions of the end portions between the cuts are deformed such that the metal sheets hook together.
  • the gap width BS of the cutting gaps 22 , 23 is approximately 1/10 of the thickness of the metal strips M 1 , M 2 , so that an optimum cut is made with a minimum production of flitter.
  • the metal strip M 2 joined thus to the metal strip M 1 is pulled by the metal strip M 1 through the processing stations, traversed successively in conveying direction F and listed here merely by way of example: A 2 (chemical degreasing), A 3 (strip dryer), A 4 (electrolytic degreasing), A 5 (surface activation), A 6 (electrolytic coating), A 7 (phosphatising), A 8 (chromating), A 9 (strip drying), until the coiling station A 10 is reached. There, the metal strips M 1 , M 2 are severed and the now coated metal strip M 2 is wound onto a new coil.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shearing Machines (AREA)
  • Metal Rolling (AREA)
US14/426,017 2013-01-22 2014-01-15 Device for Joining Flat Metal Products Passing Successively Into a Strip Processing Plant Abandoned US20150217358A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102013100641.8 2013-01-22
DE102013100641 2013-01-22
PCT/EP2014/050734 WO2014114541A1 (fr) 2013-01-22 2014-01-15 Dispositif permettant de relier des produits plats métalliques entrant successivement dans une installation de traitement de bandes

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US20150217358A1 true US20150217358A1 (en) 2015-08-06

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US14/426,017 Abandoned US20150217358A1 (en) 2013-01-22 2014-01-15 Device for Joining Flat Metal Products Passing Successively Into a Strip Processing Plant

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EP (1) EP2948259A1 (fr)
WO (1) WO2014114541A1 (fr)

Cited By (4)

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Publication number Priority date Publication date Assignee Title
US10583503B2 (en) 2017-01-18 2020-03-10 Butech Bliss Plunge slitting with enhanced scrap threading capability using notching shears
WO2021144394A1 (fr) * 2020-01-16 2021-07-22 Sms Group Gmbh Agrafeuse
CN113695415A (zh) * 2021-09-15 2021-11-26 浙江金佳异型铜业有限公司 一种铜母线排的生产工艺及其生产设备
CN114210819A (zh) * 2021-11-03 2022-03-22 苏州市中模模具科技有限公司 一种兼顾生产柔性与生产效率的型材冲孔切断机

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CN109465331B (zh) * 2018-12-29 2020-05-08 嘉善民鑫金属制品有限公司 针栅制作工艺

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10583503B2 (en) 2017-01-18 2020-03-10 Butech Bliss Plunge slitting with enhanced scrap threading capability using notching shears
WO2021144394A1 (fr) * 2020-01-16 2021-07-22 Sms Group Gmbh Agrafeuse
US11931791B2 (en) 2020-01-16 2024-03-19 Sms Group Gmbh Stitcher
CN113695415A (zh) * 2021-09-15 2021-11-26 浙江金佳异型铜业有限公司 一种铜母线排的生产工艺及其生产设备
CN114210819A (zh) * 2021-11-03 2022-03-22 苏州市中模模具科技有限公司 一种兼顾生产柔性与生产效率的型材冲孔切断机

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