CN113894172A - Screw rod double-roller driving extrusion forming device and process - Google Patents

Screw rod double-roller driving extrusion forming device and process Download PDF

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Publication number
CN113894172A
CN113894172A CN202111193662.1A CN202111193662A CN113894172A CN 113894172 A CN113894172 A CN 113894172A CN 202111193662 A CN202111193662 A CN 202111193662A CN 113894172 A CN113894172 A CN 113894172A
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blank
die
roller
screw
screw rod
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CN113894172B (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
    • 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
    • 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)
  • Extrusion Of Metal (AREA)
  • Forging (AREA)

Abstract

The invention relates to the technical field of metal plastic forming process and equipment, and provides a screw rod double-roller driving extrusion forming device and a process, wherein the device comprises a die, a charging barrel and two rollers; a spiral cavity is formed in the mold, and the linear blank is formed into a spiral rod; the feeding barrel is used for feeding blanks; two rolls are used to provide the billet with axial compression for extrusion. The process comprises the steps of softening a blank and lubricating a die; 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 and to enter a die cavity forwards at a constant speed, and extruding and forming to obtain a finished screw rod. The invention has simple structure, easy manufacture, high forming precision and wide application prospect, and can continuously form the screw rod with any length.

Description

Screw rod double-roller driving extrusion forming device and process
Technical Field
The invention relates to the technical field of metal plastic forming process and equipment, in particular to a 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.
The screw rod is usually manufactured by cutting or extrusion. The numerical control lathe is adopted to cut and form the metal bar, so that a large amount of materials are wasted, the processing time is long, the production efficiency is low, the original metal fiber tissue can be cut off in the traditional cutting process, and the mechanical property is reduced. The existing extrusion forming screw rod is mostly formed by adopting a closed cavity in an extrusion manner, the maximum size of the formed screw rod is limited by the size of the cavity, the extrusion force is completely provided by the extrusion ejector rod, the stress state is poor, and the requirement on equipment is high.
Therefore, there is a need to develop a new screw rod extrusion process and apparatus.
Disclosure of Invention
The invention aims to overcome at least one of the defects of the prior art, and provides a device and a process for double-roller driving extrusion forming of a screw rod, which have simple structure, easy manufacture, capability of continuously forming the screw rod with any length (particularly suitable for a solid screw rod) and higher forming precision.
The invention adopts the following technical scheme:
in one aspect, the invention relates to a screw rod double-roller driving extrusion forming device, which comprises a die, a charging barrel and two rollers;
a spiral cavity is formed in the die, the outline of the spiral cavity is consistent with that of the spiral rod, and the spiral cavity is used for forming the linear blank into the spiral rod; the feeding barrel is used for feeding blanks; the two rollers are used for providing axial pressure for extrusion forming for the blank;
the blank penetrates through the charging barrel and is extruded and formed into a spiral rod through the die under the driving of rolling friction force of the two rollers.
Any one of the above possible implementation manners further provides an implementation manner, wherein two rollers are arranged between the charging barrel and the die, the two rollers are symmetrically distributed in space about the billet axis, and a connecting line of central points of the two rollers perpendicularly intersects with the billet axis; the included angles between the axes of the two rollers and the axis of the 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 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 blank smoothly enters the mold cavity.
In another aspect, the present invention provides a screw rod twin-roll driving extrusion forming process, including:
s1, softening the blank, and lubricating the die;
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 blank;
s3, inserting the blank into the charging barrel, and applying axial force to the blank to enable the blank to be bitten by the two rollers; the blank rotates around the axis of the blank at a constant speed under the drive of the two rollers and enters a die cavity forwards at a constant speed, and a finished screw rod is obtained by extrusion forming.
In any of the above possible implementation manners, there is further provided an implementation manner that, in step S1, the softening process is to anneal the 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 blank is a metal material that can be used for cold plastic forming, and the material of the blank includes stainless steel, copper, and other metals.
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 billet to ensure that no relative sliding occurs between the roller and the 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 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 screw rod and the inclination angle of the roll satisfy the following relations:
Figure BDA0003302204980000021
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 screw rod; d is the diameter of the horizontal projection circle of the spiral line of the 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 rolling reduction range of the blank by the roller is as follows: 0.2mm < rolling reduction <0.8 mm.
In any of the above possible implementations, there is further provided an implementation of the hollow blankMaximum diameter D ofmax<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 screw rod with any length, and solves the problem that the traditional screw rod extrusion forming is limited by the space of the extrusion chamber and can only form the screw rod with a certain length.
2. The invention has the advantages of high screw rod forming speed and higher efficiency.
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 screw 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.
In the figure: 1. a mold; 2. rolling; 3. feeding into a charging barrel; 4. a blank; 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. 1-5, a screw rod double-roller driving extrusion forming device according to an embodiment of the present invention includes a die 1, a roller 2, a billet 4, and a feeding barrel 3; a spiral cavity is formed in the die 1, the shape contour of the spiral cavity is consistent with that of the spiral rod, and the spiral cavity is used for forming the linear blank 4 into the spiral rod; the charging barrel 3 is used for feeding blanks 4; the two rolls 2 are used to provide the extrusion axial pressure to the blank 4.
In a specific embodiment, the axis of the die 1, the axis of the blank 4 and the axis of the feeding barrel 3 are coincident.
In a specific embodiment, the inclination angles of the two rollers 2 are the same, namely the included angle between the axis of the roller 2 and the axis of the blank 4 is the same; the two rollers 2 are in the same rotating direction, rotate along the anticlockwise direction from the feeding end, and have the same rotating angular speed.
In a preferred embodiment, as shown in fig. 3, the surface of the roll 2 is knurled to increase the friction coefficient.
In one embodiment, the feeding end of the roller 2 is provided with a biting taper angle A, and the biting taper angle A is 3-10 degrees.
In one 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 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.
Without loss of generality, the following outer diameter
Figure BDA0003302204980000042
The screw rod double-roller driving extrusion forming process is illustrated by taking a pure copper screw rod with the length of 300mm and the screw pitch of 40mm as an example:
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; adopting lubricants such as graphite, molybdenum disulfide and the like to fully lubricate the spiral cavity C in the die 1;
s2, calculating to obtain an inclination angle alpha of the roller 2 which is 52.6 degrees according to the outer diameter D of the 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 2 is required to ensure that the blank 4 rotates smoothly; the set distance of the roller 2 is to ensure that the roller 2 and the blank 4 have enough friction force and ensure that the roller 2 and the 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 blank 4 into the charging barrel 3, applying axial force to the blank 4 to enable the blank 4 to be bitten by the roller 2, enabling the blank 4 to rotate around the axis of the blank at a constant speed under the driving action of friction force generated by extrusion of the roller 2 and to enter a spiral cavity C of the die 1 at a constant speed forwards, and performing extrusion forming to obtain a finished 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＝vKnot×T×SCutting block
Wherein: v. ofShaftAn axial feed rate; t time; sCutting blockThe area of the cross section of the blank;
Figure BDA0003302204980000041
ω: a blank rotation angular velocity; s: pitch of the thread; d: the diameter of the blank;
Vinto＝VGo outNamely:
Figure BDA0003302204980000051
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 BDA0003302204980000052
vShaft＝V sinα
Wherein V is the roller linear velocity; substituting into the above equation (2) results in equation (1), namely:
Figure BDA0003302204980000053
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 the screw rod 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 screw rod double-roller driving extrusion forming device is characterized by comprising a die, a charging barrel and two rollers;
a spiral cavity is formed in the die and used for forming the blank into a spiral rod; the feeding barrel is used for feeding blanks; the two rollers are used for providing axial pressure for extrusion forming for the blank;
the blank penetrates through the charging barrel and is extruded and formed into a spiral rod through the die under the driving of rolling friction force of the two rollers.
2. A twin roll screw drive extrusion apparatus as defined in claim 1 wherein two of said rolls are disposed between said barrel and die, said rolls being spatially symmetrically disposed about said billet axis, a line connecting the center points of said rolls perpendicularly intersecting said billet axis; the included angles between the axes of the two rollers and the axis of the blank are the same.
3. A twin roll screw drive extrusion apparatus as defined in claim 1 wherein the axes of the die, the feed barrel and the billet all coincide.
4. A twin roll driven extrusion forming apparatus for a screw of claim 1 wherein said roll surface is knurled.
5. A twin roll screw drive extrusion apparatus as defined in claim 1 wherein the feed end of said rolls are provided with a bite angle a of between 3 ° and 10 °.
6. A twin roll screw driven extrusion apparatus as set forth in claim 1 wherein said die is provided at its infeed end with a guide taper B for ensuring smooth entry of said billet into the die cavity.
7. A screw twin-roll driven extrusion process using the apparatus of any one of claims 1 to 6, the process comprising:
s1, softening the blank, and lubricating the die;
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 blank;
s3, inserting the blank into the charging barrel, and applying axial force to the blank to enable the blank to be bitten by the two rollers; the blank rotates around the axis of the blank at a constant speed under the drive of the two rollers and enters a die cavity forwards at a constant speed, and a finished screw rod is obtained by extrusion forming.
8. A twin roll extrusion process of a screw according to claim 7 wherein in step S1 the softening process is an annealing process of the billet to a hardness of not more than 200 HV.
9. A twin roll screw driving extrusion process as set forth in claim 7 wherein in step S2, the respective parameters of the screw and the roll inclination angle satisfy the following relations:
Figure FDA0003302204970000011
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 screw rod; d is the diameter of the horizontal projection circle of the spiral line of the screw rod.
10. A twin roll extrusion process of screw rods as in claim 7 wherein the billet is of a metallic material capable of being cold formed and the billet material comprises stainless steel and copper.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114713653A (en) * 2022-03-24 2022-07-08 上海工程技术大学 Machining method and forming die assembly for long rod part with threaded teeth for vehicle

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4501948A (en) * 1982-08-16 1985-02-26 Ga Technologies Inc. Method and apparatus for forming spiral tubing
US4951493A (en) * 1988-05-30 1990-08-28 Siekmann Fittings Gmbh & Co. Kg Method and apparatus for making a spiral pipe
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
US20080023863A1 (en) * 2006-07-31 2008-01-31 Schlumberger Technology Corporation Method and apparatus for extrusion of profiled helical tubes
CN110102575A (en) * 2019-04-30 2019-08-09 北京科技大学 A kind of two roller flexibility oblique milling forming device of axial workpiece and method
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
CN111421009A (en) * 2020-02-27 2020-07-17 北京科技大学 Screw pump rotor rotary die extrusion forming process and forming device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4501948A (en) * 1982-08-16 1985-02-26 Ga Technologies Inc. Method and apparatus for forming spiral tubing
US4951493A (en) * 1988-05-30 1990-08-28 Siekmann Fittings Gmbh & Co. Kg Method and apparatus for making a spiral pipe
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
US20080023863A1 (en) * 2006-07-31 2008-01-31 Schlumberger Technology Corporation Method and apparatus for extrusion of profiled helical tubes
CN110102575A (en) * 2019-04-30 2019-08-09 北京科技大学 A kind of two roller flexibility oblique milling forming device of axial workpiece and method
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
CN111421009A (en) * 2020-02-27 2020-07-17 北京科技大学 Screw pump rotor rotary die extrusion forming process and forming device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114713653A (en) * 2022-03-24 2022-07-08 上海工程技术大学 Machining method and forming die assembly for long rod part with threaded teeth for vehicle

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