CN113894170A - Double-roller driving extrusion forming device and process for hollow screw rod - Google Patents

Double-roller driving extrusion forming device and process for hollow screw rod Download PDF

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Publication number
CN113894170A
CN113894170A CN202111192354.7A CN202111192354A CN113894170A CN 113894170 A CN113894170 A CN 113894170A CN 202111192354 A CN202111192354 A CN 202111192354A CN 113894170 A CN113894170 A CN 113894170A
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hollow
blank
screw rod
roller
hollow screw
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CN113894170B (en
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王宝雨
王佳鹏
李沛艾
刘伟
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/14—Making other products
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/21—Presses specially adapted for extruding metal
    • B21C23/211—Press driving devices
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/21—Presses specially adapted for extruding metal
    • B21C23/212—Details
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/32—Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied
    • 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
    • B21C25/00—Profiling tools for metal extruding
    • B21C25/02—Dies
    • 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
    • B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
    • B21C29/003—Cooling or heating of work
    • 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
    • B21C33/00—Feeding extrusion presses with metal to be extruded ; Loading the dummy block

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

The invention relates to the technical field of metal plastic forming process and equipment, and provides a hollow screw rod double-roller driving extrusion forming device and a process, wherein the device comprises a die, a charging barrel, a guide barrel and two rollers; a spiral cavity is formed in the mold, and the linear hollow blank is formed into a hollow screw rod; the feeding barrel is used for feeding; two rollers are used for providing axial pressure for extrusion forming; the guide cylinder is used for improving the roundness of the hollow blank extruded by the roller. The process comprises the steps of softening a hollow blank, and lubricating a die and a guide cylinder; setting the inclination angle, the distance between rollers and the torque of the rollers; and (3) penetrating the blank into the charging barrel to be bitten by the roller, enabling the blank to rotate around the axis of the blank at a constant speed under the driving of the roller, enabling the blank to enter a die cavity through the guide barrel forwards at a constant speed, and performing extrusion forming to obtain a finished hollow screw rod. The invention has simple structure, easy manufacture, high forming precision and wide application prospect, and can continuously form hollow screw rods with any length.

Description

Double-roller driving extrusion forming device and process for hollow screw rod
Technical Field
The invention relates to the technical field of metal plastic forming process and equipment, in particular to a hollow screw rod double-roller driving extrusion forming device and process.
Background
The screw rod is in a space screw rod-shaped structure, each vertical section of the screw rod along the axial direction is complete and circular, the screw rod is commonly used for manufacturing a rotor of liquid conveying equipment such as a screw pump and the like, and the screw rod and a stator are mutually meshed to form a sealed cavity to push liquid to advance so as to convey the liquid.
At present, the screw rod is mostly of a solid structure, and under the same flow and pressure, the requirement of a rotor made of the hollow screw rod on equipment power is lower than that of the rotor made of the solid screw rod, and meanwhile, the pressure on stator rubber is lower, so that the service life of the screw pump is prolonged.
In the prior art, the outer contour of a hollow screw rod is generally manufactured by adopting a cyclone milling machine, and is similar to the rotary turning of a numerical control lathe; the internal cavity of the hollow screw rod is difficult to process, and at present, two methods exist: firstly, cutting a hollow screw rod into two parts, and processing an internal cavity; and secondly, the inner material is corroded little by adopting a die with the same outline as the inner cavity and adopting the principle of electrochemical corrosion. The method has the following defects: too high cost, low efficiency, too long time consumption and serious material waste.
Meanwhile, the extrusion forming of the traditional hollow screw rod is limited by the space of an extrusion chamber, and only a hollow screw rod with a certain length can be formed, so that a new extrusion forming process of the hollow screw rod is necessary to be formulated.
Disclosure of Invention
The invention aims to overcome at least one of the defects of the prior art, and provides a hollow screw rod double-roller driving extrusion forming device and a process, which have the advantages of simple structure, easy manufacture, capability of continuously forming hollow screw rods with any length and higher forming precision.
The invention adopts the following technical scheme:
on one hand, the invention discloses a hollow screw rod double-roller driving extrusion forming device, which comprises a die, a charging barrel, a guide barrel and two rollers, wherein the charging barrel is arranged on the die;
a spiral cavity is formed in the die, the shape contour of the spiral cavity is consistent with that of the hollow screw rod, and the spiral cavity is used for forming the linear hollow blank into the hollow screw rod; the feeding barrel is used for feeding the hollow blank; the two rollers are used for providing axial pressure for extrusion forming for the hollow blank; the guide cylinder is used for improving the roundness of the hollow blank extruded by the roller;
the hollow blank penetrates through the charging barrel, is shaped by the guide barrel under the driving of rolling friction force of the two rollers, and is extruded and formed into a hollow screw rod through the die.
Any one of the above possible implementation manners further provides an implementation manner, wherein two rollers are arranged between the charging barrel and the material guiding barrel, the two rollers are symmetrically distributed in the space around the hollow billet axis, and a connecting line of central points of the two rollers is perpendicularly intersected with the hollow billet axis; the included angles between the axes of the two rollers and the axis of the hollow blank are the same; the two rollers rotate in the same direction, for example, the rollers rotate along the counterclockwise direction from the feeding end, and the rotating angular speeds are the same.
Any one of the above possible implementation manners further provides an implementation manner, and the axes of the die, the material guiding cylinder, the material feeding cylinder and the hollow blank are all coincident.
Any of the possible implementations described above further provides an implementation in which the roll surface is knurled to increase the coefficient of friction.
Any of the possible implementations described above further provides an implementation in which the feed end of the roll is provided with a bite cone angle a, and the bite cone angle a is 3 ° to 10 °.
Any possible implementation manner described above further provides an implementation manner, and the feeding end of the mold is provided with a guide taper angle B for ensuring that the hollow blank smoothly enters the mold cavity.
Any one of the above possible implementation manners further provides an implementation manner, wherein an inner circular through hole with a taper is formed inside the material guiding cylinder, so that the roundness of the hollow blank extruded by the roller is improved.
In another aspect, the present invention provides a twin-roll driving extrusion forming process for a hollow screw rod, comprising:
s1, softening the hollow blank, and lubricating the die and the guide cylinder;
s2, setting the inclination angle, the roller distance and the roller torque of the roller; the inclination angle of the roller is the included angle between the axis of the roller and the axis of the hollow blank;
s3, inserting the hollow blank into the charging barrel, and applying axial force to the hollow blank to enable the hollow blank to be bitten by the two rollers; the hollow blank rotates around the axis of the hollow blank at a constant speed and moves forwards at a constant speed under the drive of the two rollers, the hollow blank enters a die cavity after being shaped by the guide cylinder, and a finished hollow screw rod is obtained after extrusion forming.
In any of the foregoing possible implementation manners, there is further provided an implementation manner that, in step S1, the softening process is to anneal the hollow blank, and the hardness after the treatment is not higher than 200 HV.
In any of the above possible implementations, there is further provided an implementation that the material of the hollow blank is a metal material that can be used for cold plastic forming, and the material of the hollow blank includes stainless steel and copper.
In any of the above possible implementations, there is further provided an implementation manner that, in step S2, the roller spacing is set to ensure that there is enough friction between the roller and the hollow billet to ensure that no relative sliding occurs between the roller and the hollow billet.
In any of the possible implementations described above, there is further provided an implementation in which, in step S2, the torque of the rolls is set such that the metal blank is subjected to a stress level higher than its yield strength, so that the hollow blank is permanently plastically deformed.
In any of the foregoing possible implementation manners, there is further provided an implementation manner that, in step S2, the corresponding parameters of the hollow screw rod and the roll inclination angle satisfy the following relations:
Figure BDA0003301679460000031
in the formula, alpha is a roll inclination angle, namely an acute angle formed by the roll axis and the blank axis; s is the screw pitch of the hollow screw rod; d is the diameter of the horizontal projection circle of the spiral line of the hollow screw rod.
In any of the above possible implementations, there is further provided an implementation manner that, in step S2, the two rollers are spaced apart from each other such that the diameter of the inscribed circle sandwiched between the two rollers is smaller than the outer diameter of the blank.
Any one of the above possible implementation manners further provides an implementation manner that the reduction amount range of the hollow blank by the roller is as follows: 0.1mm < rolling reduction <0.5 mm.
In any of the possible implementations described above, there is further provided an implementation in which the maximum diameter D of the hollow blank is greater than the maximum diameter D of the hollow blankmax<And 0.7R, wherein R is the diameter of the roller. Experiments prove that when D is usedmax>At 0.7R, it is difficult for the roll to provide a sufficiently large frictional axial pressure.
The invention has the beneficial effects that:
1. the invention can continuously form the hollow screw rod with any length, and solves the problem that the traditional hollow screw rod extrusion forming is limited by the space of an extrusion chamber and can only form the hollow screw rod with a certain length.
2. The invention has the advantages of high speed and higher efficiency for forming the hollow screw rod.
3. The extrusion force required by extrusion forming is shared by the two rollers, the stress state is good, the structure is simple, the equipment research and development difficulty is low, and the automatic production is easy to realize.
4. The invention has low requirements on the knowledge level and the personal skill of operators, is simple and easy to learn and is convenient to operate.
Drawings
Fig. 1 is a schematic structural view of a hollow screw rod twin-roll driving extrusion molding apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating the principle of extrusion in the embodiment.
Fig. 3 is a schematic structural view of a knurled roller in an embodiment.
Fig. 4 is a schematic structural view of the mold in the example.
Fig. 5 is a schematic sectional view of the mold in the embodiment along a symmetrical plane.
Fig. 6 is a schematic view showing a structure of a guide cylinder in the embodiment.
In the figure: 1. a mold; 2. a material guide cylinder; 3. rolling; 4. a hollow blank; 5. feeding into a charging barrel; A. the roll bite cone angle; B. a mold guide taper angle; (mold) helical cavity.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects. In the drawings of the embodiments described below, the same reference numerals appearing in the respective drawings denote the same features or components, and may be applied to different embodiments.
As shown in fig. 1 to 5, a hollow screw rod twin-roll driving extrusion forming device according to an embodiment of the present invention includes a die 1, a material guiding cylinder 2, a roller 3, a billet 4, and a material feeding cylinder 5; a cavity is formed in the die 1 and is used for forming the linear hollow blank 4 into a hollow screw rod; the charging barrel 5 is used for feeding the hollow blank 4; the two rollers 3 are used for providing axial pressure for extrusion forming for the hollow blank 4; the guide cylinder 5 is used for improving the roundness of the hollow blank 4 extruded by the roller 3.
In one specific embodiment, the axis of the die 1, the axis of the guide cylinder 2, the axis of the blank 4 and the axis of the charging cylinder 5 are coincident.
In a specific embodiment, the inclination angles of the two rollers 3 are the same, namely the included angle between the axis of the roller 3 and the axis of the hollow blank 4 is the same; the two rollers 3 rotate in the same direction and rotate along the anticlockwise direction from the feeding end, and the rotating angular speeds are the same.
In a preferred embodiment, as shown in fig. 3, the surface of the roller 3 is knurled to increase the friction coefficient.
In one embodiment, the feeding end of the roller 3 is provided with a biting taper angle A, and the biting taper angle A is 3-10 degrees.
In a specific embodiment, as shown in fig. 4, the feeding end of the mold 1 is provided with a guide taper angle B to ensure that the hollow blank 4 smoothly enters the mold cavity.
As shown in fig. 5, a spiral cavity C is formed in the mold 1, and the spiral cavity C is in accordance with the profile of the screw rod.
As shown in fig. 6, in a preferred embodiment, the guide cylinder 2 is provided with a tapered inner circular through hole inside for improving the roundness of the hollow billet 4 extruded by the rolls 3.
Without loss of generality, the following outer diameter
Figure BDA0003301679460000041
The invention discloses a double-roller driving extrusion forming process of a hollow screw rod, which is exemplified by a pure copper hollow screw rod with the wall thickness of 1.5mm, the length of 300mm and the screw pitch of 40 mm:
s1, feeding a pure copper pipe material, and carrying out annealing softening treatment, wherein the hardness of the pipe material after the softening treatment is reduced to below 200 HV; lubricating agents such as graphite, molybdenum disulfide and the like are adopted to fully lubricate the inner cavities of the die 1 and the guide cylinder 2;
s2, calculating to obtain an inclination angle alpha of the roller 3 which is 52.6 degrees according to the outer diameter D of the hollow screw rod which is 15mm and the screw pitch S which is 40mm, and setting the inclination angle, the torque and the distance between the rollers; the torque set by the roller 3 is required to ensure that the blank rotates smoothly; the set distance of the roller 3 ensures that the roller 3 and the hollow blank 4 have enough friction force and the roller 3 and the hollow blank 4 do not slide relatively; the roll torque and the roll gap can be determined experimentally or by calculation.
And S3, penetrating the softened pure copper hollow blank 4 into a charging barrel 5, applying axial force to the blank 4 to enable the blank to be bitten by a roller 3, enabling the hollow blank 4 to rotate around the axis of the hollow blank at a constant speed under the driving action of friction force generated by extrusion of the roller 3, enabling the hollow blank 4 to enter a spiral cavity C of the die 1 through a guide barrel 2 at a constant speed forward, and performing extrusion forming to obtain a finished hollow screw rod.
Further explanation regarding roll inclination angle determination:
according to the thread pitch S of the screw rod to be formed and the projection circle diameter D of the screw rod, the derivation is carried out by combining the formula (1), and the derivation process is as follows:
principle: principle of equal volume (volume V of propelling die)IntoExpressed volume VGo out)
VInto＝vShaft×T×SNumber of
Wherein: v. ofShaftAn axial feed rate; t time; sCutting blockThe area of the cross section of the blank;
Figure BDA0003301679460000051
ω: a blank rotation angular velocity; s: pitch of the thread; d: the diameter of the blank;
Vinto＝VGo outNamely:
Figure BDA0003301679460000052
in the prior art, omega is controlled by rotating a mold, and v is controlled by the push speed of a mandrilShaft. The two devices move to ensure the coordination of movement, which is troublesome.
In the application, omega and v are coordinately controlled by adjusting the inclination angle of the rollerShaftIt is simple and convenient.
Figure BDA0003301679460000053
vShaft＝V sinα
Wherein V is the roller linear velocity; substituting into the above equation (2) results in equation (1), namely:
Figure BDA0003301679460000054
wherein alpha is the inclination angle of the roller, namely the acute angle formed by the axis of the roller and the axis of the blank; s is the screw pitch of the hollow screw rod; d is the diameter of the horizontal projection circle of the spiral line of the hollow screw rod.
The roll inclination angles are coordinated to satisfy the axial feeding speed and the rotating speed of the screw rod. If the formula (1) is not satisfied, the formed screw rod is unbalanced in feeding and discharging, the screw pitch S is not up to standard, the cross section of the screw rod is not round, and the like.
The invention has simple structure, easy manufacture, high forming precision and wide application prospect, and can continuously form hollow screw rods with any length.
While several embodiments of the present invention have been presented herein, it will be appreciated by those skilled in the art that changes may be made to the embodiments herein without departing from the spirit of the invention. The above examples are merely illustrative and should not be taken as limiting the scope of the invention.

Claims (10)

1. A hollow screw rod double-roller driving extrusion forming device is characterized by comprising a die, a feeding barrel, a guide barrel and two rollers;
a spiral cavity is formed in the die and used for forming the hollow blank into a hollow screw rod; the feeding barrel is used for feeding the hollow blank; the two rollers are used for providing axial pressure for extrusion forming for the hollow blank; the guide cylinder is used for improving the roundness of the hollow blank extruded by the roller;
the hollow blank penetrates through the charging barrel, is shaped by the guide barrel under the driving of rolling friction force of the two rollers, and is extruded and formed into a hollow screw rod through the die.
2. A hollow screw twin roll driving extrusion forming apparatus as claimed in claim 1 wherein two said rolls are provided between said feed barrel and said guide barrel, said two said rolls being spatially symmetrically distributed about said hollow billet axis, a line connecting center points of said two said rolls perpendicularly intersecting said hollow billet axis; the included angles between the axes of the two rollers and the axis of the hollow blank are the same.
3. A hollow screw twin roll driven extrusion forming apparatus as claimed in claim 1 wherein the axes of the die, the guide cylinder, the feed cylinder and the hollow billet are all coincident.
4. A hollow screw twin roll driven extrusion forming apparatus as set forth in claim 1 wherein said roll surface is knurled.
5. A hollow screw twin roll driven extrusion forming apparatus as claimed in claim 1 wherein the feed end of said roll is provided with a bite angle a of 3 ° to 10 °.
6. A hollow screw twin roll driven extrusion forming apparatus as claimed in claim 1 wherein the feed end of the die is provided with a guide taper angle B for ensuring smooth entry of the hollow billet into the die cavity.
7. A hollow screw twin roll driving extrusion molding apparatus as set forth in claim 1, wherein said guide cylinder is provided with a tapered inner circular through hole inside.
8. A process for twin roll driven extrusion of hollow helical rods using apparatus as claimed in any one of claims 1 to 7, the process comprising:
s1, softening the hollow blank, and lubricating the die and the guide cylinder;
s2, setting the inclination angle, the roller distance and the roller torque of the roller; the inclination angle of the roller is the included angle between the axis of the roller and the axis of the hollow blank;
s3, inserting the hollow blank into the charging barrel, and applying axial force to the hollow blank to enable the hollow blank to be bitten by the two rollers; the hollow blank rotates around the axis of the hollow blank at a constant speed and moves forwards at a constant speed under the drive of the two rollers, the hollow blank enters a die cavity after being shaped by the guide cylinder, and a finished hollow screw rod is obtained after extrusion forming.
9. A process for twin roll extrusion of hollow screw rods as claimed in claim 8 wherein in step S1 the softening process is an annealing process of the hollow blanks to a hardness of not more than 200 HV.
10. A process for twin roll driving extrusion of a hollow screw rod as claimed in claim 8, wherein in step S2, the parameters of the hollow screw rod and the roll inclination angle satisfy the following relations:
Figure FDA0003301679450000021
in the formula, alpha is a roll inclination angle, namely an acute angle formed by the roll axis and the blank axis; s is the screw pitch of the hollow screw rod; d is the diameter of the horizontal projection circle of the spiral line of the hollow screw rod.
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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4951493A (en) * 1988-05-30 1990-08-28 Siekmann Fittings Gmbh & Co. Kg Method and apparatus for making a spiral pipe
JP2003126916A (en) * 2001-10-18 2003-05-08 Sango Co Ltd Production method and equipment for pipe with helical groove
CN1694641A (en) * 2002-10-31 2005-11-09 东芝泰格有限公司 Method and apparatus for producing mounting member of rotary cleaning member
CN203076484U (en) * 2013-02-04 2013-07-24 烟台海歌机床有限公司 Double-stand-column curve roller material rotation type feeding device
WO2013113312A1 (en) * 2012-01-30 2013-08-08 Sieber Forming Solutions Gmbh Method and device for producing metal components with a shank that is deformed along the longitudinal axis thereof into at least one helix
CN104399834A (en) * 2014-12-01 2015-03-11 浙江科宇金属材料有限公司 Feeding device of copper bar straightening machine
CN105598214A (en) * 2015-12-21 2016-05-25 太原重工股份有限公司 Straight roller type pipe straightening machine and method
CN209466640U (en) * 2018-12-10 2019-10-08 济南大学 A kind of novel rubber pipe conveying device
CN111229848A (en) * 2020-02-27 2020-06-05 北京科技大学 Rotary die extrusion forming process and device for hollow rotor with equal wall thickness of screw pump

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4951493A (en) * 1988-05-30 1990-08-28 Siekmann Fittings Gmbh & Co. Kg Method and apparatus for making a spiral pipe
JP2003126916A (en) * 2001-10-18 2003-05-08 Sango Co Ltd Production method and equipment for pipe with helical groove
CN1694641A (en) * 2002-10-31 2005-11-09 东芝泰格有限公司 Method and apparatus for producing mounting member of rotary cleaning member
WO2013113312A1 (en) * 2012-01-30 2013-08-08 Sieber Forming Solutions Gmbh Method and device for producing metal components with a shank that is deformed along the longitudinal axis thereof into at least one helix
CN203076484U (en) * 2013-02-04 2013-07-24 烟台海歌机床有限公司 Double-stand-column curve roller material rotation type feeding device
CN104399834A (en) * 2014-12-01 2015-03-11 浙江科宇金属材料有限公司 Feeding device of copper bar straightening machine
CN105598214A (en) * 2015-12-21 2016-05-25 太原重工股份有限公司 Straight roller type pipe straightening machine and method
CN209466640U (en) * 2018-12-10 2019-10-08 济南大学 A kind of novel rubber pipe conveying device
CN111229848A (en) * 2020-02-27 2020-06-05 北京科技大学 Rotary die extrusion forming process and device for hollow rotor with equal wall thickness of screw pump

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