CN203678842U - Four-roll rotation perforating machine device - Google Patents
Four-roll rotation perforating machine device Download PDFInfo
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- CN203678842U CN203678842U CN201320888662.8U CN201320888662U CN203678842U CN 203678842 U CN203678842 U CN 203678842U CN 201320888662 U CN201320888662 U CN 201320888662U CN 203678842 U CN203678842 U CN 203678842U
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Abstract
The utility model provides a four-roll rotation perforating machine device. The device comprises a main machine seat, a roller pair, a guide roller pair, a first driving motor, a second driving motor, a third driving motor, a fourth driving motor, a driving device, a main machine seat rotation motor, a controller, and a man-machine interface; the roller pair comprises a first roller and a second roller; the guide roller pair comprises a first guide roller and a second guide roller; the driving device is connected with the first driving motor, the second driving motor, the third driving motor and the fourth driving motor; the main machine seat rotation motor is connected with the main machine seat via a synchronous belt; a controller is connected with the driving device; and the man-machine interface is connected with the controller. According to the utility model, rolled pieces will not be displaced transversely, so torsional deformation is effective reduced or even eliminated.
Description
Technical field
The utility model relates to seamless pipe production technical field, particularly a kind of four roller rotary piercing machines.
Background technology
In at present domestic production line of seamless tubes, the punch that main flow adopts is Mannesmann piercing machine.But due to the particularity of ultra pure alloy (special stainless steel) on many production links such as heating, hot-working and heat treatment, and two-roller skew-rolling wears the intrinsic characteristic defective of machine itself, makes the equipment of the type there will be aborning following defect:
(1) Mannesmann piercing machine is in the time of perforation, and pipe produces torsional deflection between the each cross section of hollow billet.And in deformed area, pipe produces relative angular displacement between the each cross section of hollow billet.
(2), when punch is bored a hole, can produce longitudinal shear distortion.Wherein, longitudinal shear distortion refers to that ectonexine metal produces additional mutual detrusion vertically.
(3), when two-roll piercer is bored a hole, rolled piece can produce additional deformation.
(4), according to statistics, while adopting two-roll piercer pierced billet stainless steel, the surfaces externally and internally defect of steel pipe exceeds 10 times of left and right during compared with rolling carbon steel.This is that surfaces externally and internally is easy to produce defect because stainless steel is not yielding.
Utility model content
The purpose of this utility model is intended at least solve one of described technological deficiency.
For this reason, the purpose of this utility model is to propose a kind of four roller rotary piercing machines, and this device can make rolled piece laterally there is no displacement, thereby effectively reduces and even eliminate torsional deflection.
For achieving the above object, the utility model proposes a kind of four roller rotary piercing machines, comprising: main engine bed; Roll pair, described roll is to comprising the first roll and the second roll, wherein said the first roll and described the second roll are relatively arranged on described main engine bed; Deflector roll pair, described deflector roll is to comprising the first deflector roll and the second deflector roll, wherein said the first deflector roll and the second deflector roll are relatively arranged on described main engine bed; The first drive motors and the second drive motors, described the first drive motors and the second drive motors are installed on roll mandrel, and described roll mandrel is connected with the second roll with described the first roll; The 3rd drive motors and the 4th drive motors, described the 3rd drive motors and the 4th drive motors are installed on guide roller axis, and described guide roller axis is connected with the second deflector roll with described the first deflector roll; Drive unit, described drive unit is connected with described the first drive motors, described the second drive motors, described the 3rd drive motors and described the 4th drive motors; Main engine bed electric rotating machine, described main engine bed electric rotating machine is connected with described main engine bed by synchronous belt; Controller, described controller is connected with described drive unit; Man-machine interface, described man-machine interface is connected with described controller.
In an embodiment of the present utility model, described the first roll, described the second roll, described the first deflector roll and described the second deflector roll are tapered roller.
In another embodiment of the present utility model, described four roller rotary piercing machines also comprise first to fourth backing roll, described the first backing roll is connected to support described the first roll with described the first roll, described the second backing roll is connected to support described the second roll with described the second roll, described the 3rd backing roll is connected to support described the first deflector roll with described the first deflector roll, and described the 4th backing roll is connected to support described the second deflector roll with described the second deflector roll.
In another embodiment of the present utility model, described the first drive motors, described the second drive motors, described the 3rd drive motors and described the 4th drive motors are the hollow high polarity permagnetic synchronous motor that directly drives.
In an embodiment of the present utility model, described drive unit comprises: first to fourth driver element, wherein said the first driver element is connected with described the first drive motors, described the second driver element is connected with described the second drive motors, described the 3rd driver element is connected with described the 3rd drive motors, and described 4 wheel driven moving cell is connected with described the 4th drive motors.
In another embodiment of the present utility model, each described driver element is frequency converter.
In another embodiment of the present utility model, described drive unit comprises: rectifier, and described rectifier is connected with described controller; The first inverter, one end of described the first inverter is connected with described the first drive motors, and the other end is connected with described controller with described rectifier; The second inverter, one end of described the second inverter is connected with described the second drive motors, and the other end is connected with described controller with described rectifier; The 3rd inverter, one end of described the 3rd inverter is connected with described the 3rd drive motors, and the other end is connected with described controller with described rectifier; The 4th inverter, one end of described the 4th inverter is connected with described the 4th drive motors, and the other end is connected with described controller with described rectifier.
In an embodiment of the present utility model, described controller is programmable logic controller (PLC) PLC.
In another embodiment of the present utility model, described man-machine interface is touch-screen or industrial computer.
According to four roller rotary piercing machines of the present utility model, take two roller conic perforators as basis, change passive guide plate into initiatively cone-shaped roll, change common transmission into four working rolls and drive separately, increase frame whirligig, and increase freely backing roll to improve the rigidity of roll.And four roller rotary piercing machines of the present utility model in process of production, by applicable speed proportioning, can make rolled piece laterally there is no displacement, thereby effectively reduce and even eliminate torsional deflection.And, when four tapered rollers rotate, can realize the relative active movement that top drives, thereby reduce longitudinally to cut distortion.More than eliminating, after two kinds of distortion, additional deformation reduces naturally, also can increase effective life of rolling tool simultaneously.Four roller rotary piercing machines of the present utility model can be used as the control system of four roller drive, are basis and strong guarantee that rotation milling train is achieved above-mentioned functions.
The aspect that the utility model is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present utility model and advantage accompanying drawing below combination is understood becoming the description of embodiment obviously and easily, wherein:
Fig. 1 is according to the schematic diagram of four roller rotary piercing machines of the first embodiment of the present utility model;
Fig. 2 is according to the front view of the four roller rotary piercing machines of the utility model embodiment;
Fig. 3 is according to the side view of the four roller rotary piercing machines of the utility model embodiment;
Fig. 4 is according to the stereogram of the four roller rotary piercing machines of the utility model embodiment;
Fig. 5 is the torque-speed characteristic schematic diagram according to the drive motors of the utility model embodiment;
Fig. 6 is according to the schematic diagram of four roller rotary piercing machines of the second embodiment of the present utility model;
Fig. 7 is according to the schematic diagram of four roller rotary piercing machines of the 3rd embodiment of the present utility model.
The specific embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
In the utility model, unless otherwise clearly defined and limited, the terms such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term in the utility model.
In addition, term " first ", " second " be only for describing object, and can not be interpreted as indication or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of the present utility model, the implication of " multiple " is two or more, unless otherwise expressly limited specifically.
Below with reference to Fig. 1 to Fig. 7, the four roller rotary piercing machines of the utility model embodiment are described.Four roller rotary piercing machines of the present utility model are mainly used in ultra pure alloy production line of seamless tubes, also can be applied to common production line of seamless tubes.
As shown in Figure 1, the four roller rotary piercing machines that the utility model provides comprise: main engine bed, roll to, deflector roll to, the first drive motors 5, the second drive motors 6, the 3rd drive motors 7, the 4th drive motors 8, drive unit, main engine bed electric rotating machine, controller 13 and man-machine interface 14.
Particularly, roll is to comprising the first roll 1 and the second roll 2, and wherein the first roll 1 and the second roll 2 are relatively arranged on main engine bed.Deflector roll is to comprising the first deflector roll 3 and the second deflector roll 4, and wherein the first deflector roll 3 and the second deflector roll 4 are relatively arranged on main engine bed.
In an embodiment of the present utility model, as shown in Figure 2, the first roll 1, the second roll 2, the first deflector roll 3 and the second deflector roll 4 are tapered roller.Each roll centre-to-centre spacing is adjustable.As can be seen from Figure 2, the first roll 1, the second roll 2, the first deflector roll 3 and the second deflector roll 4 are evenly arranged, wherein replace the guide plate of original conic perforator with the roll of two positioned opposite, thereby make the first roll 1, the second roll 2, the first deflector roll 3 and the second deflector roll 4 form a closed type that meets two-roller skew-rolling pierced billet principle.
In an embodiment of the present utility model, the linear velocity of roll and deflector roll can, by the requirement of technique, be set different speed for the seamless pipe of different size, and will accomplish that rolled piece linear resonance surface velocity is synchronous between above-mentioned four rollers., between the first roll 1, the second roll 2, the first deflector roll 3 and the second deflector roll 4, to accomplish that rolled piece linear resonance surface velocity is synchronous.
In addition, as can be seen from Figure 2 main engine bed can rotate around rolled piece, and coordinates active drive forcer device 21, the defect producing can effectively reduce like this pierced billet stainless steel tube being caused by former Mannesmann piercing machine inherent characteristic time.
As shown in Figure 3 and Figure 4, four roller rotary piercing machines of the present utility model also comprise first to fourth backing roll.Wherein, the first backing roll 24 is connected to support the first roll 1 with the first roll 1, the second backing roll 22 and the second roll 2 are connected to support the second roll 2, the three backing rolls 23 and are connected to support the first deflector roll 3, the four backing rolls 25 with the first deflector roll 3 and are connected to support the second deflector roll 4 with the second deflector roll 4.By above-mentioned four freely backing roll support respectively four rolls, thereby reach the object that increases roll rigidity.
Particularly, the gap of roll and deflector roll is adjustable.Adjustable and reduce the complexity of frame for movement for realizing the gap of roll and deflector roll, adopt four hollow straight drive torque motors to be directly installed on and drive on roll mandrel and guide roller axis, the first drive motors 5, the second drive motors 6, the 3rd drive motors 7 and the 4th drive motors 8 are hollow straight drive torque motor, roll mandrel and guide roller axis are installed on respectively on the output of the first drive motors 5, the second drive motors 6, the 3rd drive motors 7, the 4th drive motors 8, and adopt the driver element of frequency converter as drive motors, thereby it is synchronous to realize four axles.
Particularly, roll mandrel is installed on the output of the first drive motors 5 and the output of the second drive motors 6, and wherein roll mandrel is all connected with the second roll 2 with the first roll 1.
Guide roller axis is installed on the output of the 3rd drive motors 7 and the output of the 4th drive motors 8, and wherein guide roller axis is all connected with the second deflector roll 4 with the first deflector roll 3.
The first drive motors 5, the second drive motors 6, the 3rd drive motors 7 and the 4th drive motors 8 directly drive four cone-shaped roll rotations by roll mandrel and guide roller axis, drive the first roll 1, the second roll 2, the first deflector roll 3 and the second deflector roll 4 rotations.
In an embodiment of the present utility model, the first drive motors 5, the second drive motors 6, the 3rd drive motors 7 and the 4th drive motors 8 are the hollow high polarity permagnetic synchronous motor that directly drives.Because be core motor, so mounting means is simple flexibly, effectively reduce mechanical complexity and machining accuracy, thereby significantly reduced product cost.
Illustrate, rotary piercing machine is as follows to the requirement of drive motors: the range of speeds: 0-200RPM; Required maximum square is turned round: 4500NM; Quantity: four.
According to above parameter, it is the straight drive torque motor of 1FW3385-2SG73-7AA0 type liquid cooling that drive motors of the present utility model can adopt model.The basic parameter of this motor is as shown in table 1:
Table 1
Fig. 5 shows the torque-speed characteristic that model is the straight drive torque motor of 1FW3385-2SG73-7AA0 type liquid cooling.As can be seen from Figure 5, drive motors, in the following range of speeds of 200RPM, can be stablized output and be the torque of 5000Nm to the maximum, thereby can meet the requirement of technique to motor.
Because above-mentioned four motors are to be directly installed on roll mandrel or guide roller axis, so can effectively subdue the elasticity on driving shaft and reverse gap.Not only improve mechanical delivery efficiency, synchronously carried out physical basis for what improve working face again.In addition, above-mentioned four drive motors adopt permanent magnet synchronous machine, and it is strong that this serial motors has overload capacity, and the advantage that detent torque is large is suitable as the drive motors of rotary piercing machine very much.
Drive unit is connected with the 4th drive motors 8 with the first drive motors 5, the second drive motors 6, the 3rd drive motors 7.Wherein, drive unit can be realized by frequency converter or inverter.In other words, adopt frequency converter or the inverter driver element as drive motors, thereby it is synchronous to realize speed and position between roll and deflector roll.
Shown in figure 1, drive unit comprises first to fourth driver element, wherein, the first driver element 9 is connected with the first drive motors 5, the second driver element 10 is connected with the second drive motors 6, the 3rd driver element 11 is connected with the 3rd drive motors 7, and 4 wheel driven moving cell 12 is connected with the 4th drive motors 8.Wherein, each driver element is frequency converter.Adopt frequency converter as driver element, can guarantee that drive motors speed is adjustable.Frequency converter has vector control or SERVO CONTROL or Direct Torque Control function.
In an example of the present utility model, frequency converter can adopt SINAMICS S120 Series Frequency Converter.This Series Frequency Converter can realize vector control and SERVO CONTROL, and can control four axis servomotors or vector axle with a control module simultaneously, thereby realizes complicated transmission application.
In the utility model, select an AC/DC power module in SINAMICS as power supply unit, select the driver element of four DC/AC motor modules as drive motors.The dc bus of four DC/AC motor module sharing A C/DC, and brake unit and braking resistor are installed on dc bus to be absorbed in the energy that in brake hard situation, mechanical system produces.Four motor modules adopt same CU320 control module, and by a high speed in good time swap data of Drive-CLIQ bus, synchronous to realize position and speed between four axles.
Synchronous for realizing position and speed between four axles, can control by three kinds of control modes:
Control mode one: control according to master-slave mode, primary transducer speed closed loop, from motor torque closed loop.
Two: four axles of control mode are speed closed loop, get the actual torque of main shaft as the torque amplitude limit of itself from axle.
Three: four axles of control mode are speed closed loop, and the speed actual value of getting main shaft from axle compares with the speed actual value of itself, and speed difference is as the velocity compensation from axle.
Fig. 6 shows the schematic diagram that drive unit is four roller rotary piercing machines of inverter.
As shown in Figure 6, drive unit comprises: the first inverter 15, the second inverter 16, the 3rd inverter 17, the 4th inverter 18 and rectifier 19.Wherein, rectifier 19 is connected with controller 13, one end of the first inverter 15 and the first drive motors 5, the other end is connected with controller 13 with rectifier 19, one end of the second inverter 16 and the second drive motors 6, and the other end is connected with controller 13 with rectifier 19, one end of the 3rd inverter 17 and the 3rd drive motors 7, the other end is connected with controller 13 with rectifier 19, one end of the 4th inverter 18 and the 4th drive motors 8, and the other end is connected with controller 13 with rectifier 19.
In an embodiment of the present utility model, the rated power of a drive motors is 130KW, and four while working, its rated power is 130KW*4=520KW simultaneously.Consider certain safety allowance, the utility model can select model to be: the basic rectification unit 19 that 6SL3330-1TE41-2AA3 rated power is 560KW.
Inverter driving flowing mode is motor of a Driven by inverter.Thereby the power of inverter is a bit larger tham the power of drive motors.It is 6SL3320-1TE33-1AA3 that the utility model can adopt model, the inverter that rated power is 160KW.
Consider that drive motors needs brake hard in the special technique moment, thereby need to increase braking resistor and brake unit.Shown in Fig. 7, the braking power maximum demand 130KW*4=520KW of four motors at full capacity time, brake 15 second cycle according to every 90 seconds and consider, can select brake unit B1 and the braking resistor R1 of two P15=250KW, and the brake unit B2 of a P15=125KW and braking resistor R2.The model of brake unit B1 and B2 is respectively 6SL3300-1AE32-5AA0 and 6SL3300-1AE31-3AA0.The model of braking resistor R1 and R2 is respectively 6SL3000-1BE32-5AA0 and 6SL3000-1BE32-3AA0.
Each drive motors is all connected with corresponding inverter by outlet reactor L0, and rectifier 19 is connected with wiring contactor K2 by reactor L1, and wiring contactor K2 is further connected with lead-in circuit breaker K1.
In an embodiment of the present utility model, the model of outlet reactor L0 is 6SL3000-2BE33-2AA0, the parameter of reactor L1 is 1010A/8.8V, and the parameter of wiring contactor K2 is 1250A/440V, and the model of lead-in circuit breaker K1 is 6SL3000-0CE41-0AA0.
Main engine bed electric rotating machine is connected with main engine bed by synchronous belt.Particularly, main engine bed electric rotating machine drives main engine bed to revolve round the sun around rolled piece by synchronous belt.By different Design of Rotations, make the linear velocity of the active roll that replaces guide plate consistent with the linear velocity of the rolled piece outer surface being in contact with it.
In an embodiment of the present utility model, by adjusting the rotating speed of main engine bed electric rotating machine, can change the rotating speed of main engine bed around rolled piece revolution, thereby make rolled piece transfer to no longer and rotating by rotation.
In an embodiment of the present utility model, the model of controller 13 is 6ES7315-2AG10-0AB0, the model 6SL3040-0MA00-0AA1 of CU320 control module 20.
Man-machine interface 14 is connected with controller 13.In an embodiment of the present utility model, man-machine interface 14 can be touch-screen or industrial computer.Particularly, adopt touch-screen or industrial computer as man-machine interface, and work out friendly operation interface.Operating personnel can carry out the setting of technological parameter by this man-machine interface 14, and can observation analysis equipment and state of arts.
In an embodiment of the present utility model, man-machine interface 14 adopts KTP1000 series 10.4 ' 256 look touch-screens as man-machine interface, and works out friendly operation interface.Operating personnel can carry out by this touch-screen the setting of technological parameter, and can observation analysis equipment and state of arts.In an example of the present utility model, touch-screen model can be 6AV6647-0AE11-3AXO.
According to the four roller rotary piercing machines of the utility model embodiment, take two roller conic perforators as basis, change passive guide plate into initiatively cone-shaped roll, change common transmission into four working rolls and drive separately, increase frame whirligig, and increase freely backing roll to improve the rigidity of roll.And four roller rotary piercing machines of the present utility model in process of production, by applicable speed proportioning, can make rolled piece laterally there is no displacement, thereby effectively reduce and even eliminate torsional deflection.And, when four tapered rollers rotate, can realize the relative active movement that top drives, thereby reduce longitudinally to cut distortion.More than eliminating, after two kinds of distortion, additional deformation reduces naturally, also can increase effective life of rolling tool simultaneously.Four roller rotary piercing machines of the present utility model can be used as the control system of four roller drive, are basis and strong guarantee that rotation milling train is achieved above-mentioned functions.
In the description of this description, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And specific features, structure, material or the feature of description can be with suitable mode combination in any one or more embodiment or example.
Although illustrated and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment in the situation that not departing from principle of the present utility model and aim in scope of the present utility model, modification, replacement and modification.Scope of the present utility model is extremely equal to and limits by claims.
Claims (9)
1. four roller rotary piercing machines, is characterized in that, comprising:
Main engine bed;
Roll pair, described roll is to comprising the first roll and the second roll, wherein said the first roll and described the second roll are relatively arranged on described main engine bed;
Deflector roll pair, described deflector roll is to comprising the first deflector roll and the second deflector roll, wherein said the first deflector roll and the second deflector roll are relatively arranged on described main engine bed;
The first drive motors and the second drive motors, described the first drive motors and the second drive motors are installed on roll mandrel, and described roll mandrel is connected with the second roll with described the first roll;
The 3rd drive motors and the 4th drive motors, described the 3rd drive motors and the 4th drive motors are installed on guide roller axis, and described guide roller axis is connected with the second deflector roll with described the first deflector roll;
Drive unit, described drive unit is connected with described the first drive motors, described the second drive motors, described the 3rd drive motors and described the 4th drive motors;
Main engine bed electric rotating machine, described main engine bed electric rotating machine is connected with described main engine bed by synchronous belt;
Controller, described controller is connected with described drive unit;
Man-machine interface, described man-machine interface is connected with described controller.
2. four roller rotary piercing machines as claimed in claim 1, is characterized in that, described the first roll, described the second roll, described the first deflector roll and described the second deflector roll are tapered roller.
3. four roller rotary piercing machines as claimed in claim 1, it is characterized in that, also comprise first to fourth backing roll, described the first backing roll is connected to support described the first roll with described the first roll, described the second backing roll is connected to support described the second roll with described the second roll, described the 3rd backing roll is connected to support described the first deflector roll with described the first deflector roll, and described the 4th backing roll is connected to support described the second deflector roll with described the second deflector roll.
4. four roller rotary piercing machines as claimed in claim 1, is characterized in that, described the first drive motors, described the second drive motors, described the 3rd drive motors and described the 4th drive motors are the hollow high polarity permagnetic synchronous motor that directly drives.
5. four roller rotary piercing machines as claimed in claim 1, it is characterized in that, described drive unit comprises: first to fourth driver element, wherein said the first driver element is connected with described the first drive motors, described the second driver element is connected with described the second drive motors, described the 3rd driver element is connected with described the 3rd drive motors, and described 4 wheel driven moving cell is connected with described the 4th drive motors.
6. four roller rotary piercing machines as claimed in claim 5, is characterized in that, each described driver element is frequency converter.
7. four roller rotary piercing machines as claimed in claim 1, is characterized in that, described drive unit comprises:
Rectifier, described rectifier is connected with described controller;
The first inverter, one end of described the first inverter is connected with described the first drive motors, and the other end is connected with described controller with described rectifier;
The second inverter, one end of described the second inverter is connected with described the second drive motors, and the other end is connected with described controller with described rectifier;
The 3rd inverter, one end of described the 3rd inverter is connected with described the 3rd drive motors, and the other end is connected with described controller with described rectifier;
The 4th inverter, one end of described the 4th inverter is connected with described the 4th drive motors, and the other end is connected with described controller with described rectifier.
8. four roller rotary piercing machines as claimed in claim 1, is characterized in that, described controller is programmable logic controller (PLC) PLC.
9. four roller rotary piercing machines as claimed in claim 1, is characterized in that, described man-machine interface is touch-screen or industrial computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320888662.8U CN203678842U (en) | 2013-12-27 | 2013-12-27 | Four-roll rotation perforating machine device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320888662.8U CN203678842U (en) | 2013-12-27 | 2013-12-27 | Four-roll rotation perforating machine device |
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| CN203678842U true CN203678842U (en) | 2014-07-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104259208A (en) * | 2014-10-21 | 2015-01-07 | 太原普莱设工程技术有限公司 | Four-roll oblique rolling puncher |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104259208A (en) * | 2014-10-21 | 2015-01-07 | 太原普莱设工程技术有限公司 | Four-roll oblique rolling puncher |
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Granted publication date: 20140702 Termination date: 20151227 |
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