CN111229848B - Rotary die extrusion forming process and device for hollow rotor with equal wall thickness of screw pump - Google Patents
Rotary die extrusion forming process and device for hollow rotor with equal wall thickness of screw pump Download PDFInfo
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- CN111229848B CN111229848B CN202010124192.2A CN202010124192A CN111229848B CN 111229848 B CN111229848 B CN 111229848B CN 202010124192 A CN202010124192 A CN 202010124192A CN 111229848 B CN111229848 B CN 111229848B
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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
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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
- B21C23/32—Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Organic Chemistry (AREA)
- Rotary Pumps (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of screw pumps, and provides a screw pump equal-wall-thickness hollow rotor rotary die extrusion forming process and a forming device, wherein the process comprises the following steps: softening the metal pipe material and turning an outer circle or an inner hole; lubricating before extruding metal pipe material, rotary die and extrusion cylinder; putting the lubricated metal tube material into an extrusion cylinder, and setting the movement speed and pressure of an extrusion ejector rod, and the rotation angular speed and torque of a rotary die; and extruding and forming the metal pipe material to obtain a finished product. The forming device comprises a frame, a lead screw, an extrusion container fixing seat, an extrusion ejector rod, a rotary die and a rotary die fixing seat; the extrusion cylinder is used for placing metal pipe materials; the lead screw drives the extrusion mandril to move in the extrusion container to realize the extrusion of the blank; a spiral through hole is formed in the center of the axis of the rotary die; when the rotary die rotates around the axis, the metal pipe material extruded by the extrusion mandril is formed into the screw pump rotor. The invention can improve the material utilization rate, reduce the processing cost and improve the processing efficiency, and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of screw pumps, in particular to a rotary die extrusion forming process and a rotary die extrusion forming device for a hollow rotor with equal wall thickness of a screw pump.
Background
The screw pump is used as a liquid conveying device, and the rotor is the main rotating part of the screw pump. The rotor is usually made of solid metal and has a special spatial helical structure. In order to realize the special spiral structure, special processing equipment is often adopted to cut, process and form the metal bar. However, approximately half or more of the material is removed during the cutting process, resulting in a large amount of waste material. And the cutting processing cost is higher, and the processing period is long. The hollow rotor has less power requirement than the solid rotor under the same flow and pressure, and has less pressure to the stator rubber and less relative friction loss, and is favorable to prolonging the service life of the stator. Therefore, it is necessary to develop a new process for machining and forming the hollow rotor of the screw pump to achieve the purposes of saving machining materials, reducing cost, improving machining efficiency, reducing energy consumption and prolonging the service life of equipment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a rotary die extrusion forming process and a rotary die extrusion forming device for a hollow rotor with equal wall thickness of a screw pump and the like, improves the material utilization rate in the processing and manufacturing process, reduces the processing cost, improves the processing efficiency and prolongs the service life.
The invention adopts the following technical scheme:
a screw pump equal-wall-thickness hollow rotor rotary die extrusion forming process comprises the following steps:
s1, discharging the metal pipe material, softening the metal pipe material, turning an outer circle, wherein the wall thickness of the turned pipe material meets the use requirement, and the pipe material cannot be locally crushed in the extrusion process, so that the pipe material cannot be formed;
s2, performing lubrication pretreatment before extrusion on the metal pipe material, the rotary die and the extrusion cylinder which are processed by the S1;
s3, placing the metal tube material subjected to the lubricating treatment into the extrusion cylinder, and setting the movement speed and pressure of the extrusion ejector rod and the rotation angular speed and torque of the rotary die; carrying out extrusion forming on the metal pipe material to obtain a finished product; the pressure of the ejector pins and the torque of the rotary die are set so that the stress level borne by the pipe is higher than the yield strength of the pipe, the metal pipe is subjected to permanent deformation, and the pressure of the ejector pins and the torque of the rotary die are determined through experiments or calculation.
Further, the metal pipe material is made of stainless steel, copper or composite metal.
Further, in step S1, the softening process specifically includes: and annealing the metal pipe material, wherein the hardness of the processed metal pipe material is not higher than 200 HV.
Further, in step S3, during the process of forming the hollow rotor with a wall thickness such as a screw pump, the rotational angular velocity of the rotary die and the movement velocity of the extrusion ram satisfy the following relation:
in the formula, omega is the rotating angular speed of the die; v is the movement speed of the extrusion mandril; s is the rotor pitch; d is the diameter of the horizontal projection circle of the rotor spiral line.
A screw pump equal wall thickness hollow rotor rotary die extrusion forming device is used for the screw pump equal wall thickness hollow rotor rotary die extrusion forming process, and comprises a rack, a screw driving motor, a speed reducer, an extrusion container fixing seat, an extrusion ejector rod, a rotary die fixing seat driving motor, a speed reducer and a rotary die fixing seat;
the extrusion cylinder is used for placing metal pipe materials;
the screw rod is positioned at the rear end of the extrusion container and drives the extrusion ejector rod to move in the extrusion container under the drive of a screw rod driving motor and a speed reducer so as to realize the extrusion of the metal pipe material;
the rotary die is positioned at the front end of the extrusion container, and a spiral through hole is formed in the center of the axis of the rotary die; the rotary die rotates around the axis under the driving of the rotary die fixing seat driving motor and the speed reducer, and the metal pipe material extruded by the extrusion ejector rod is formed into a hollow rotor with the wall thickness of a screw pump and the like;
the extrusion container is arranged on the extrusion container fixing seat; the rotary die is arranged on the rotary die fixing seat; the lead screw and the extrusion container fixing seat are both arranged on the rack; the rotary die mounting seat is mounted on the rack through a bearing.
Further, the rotary die is arranged in a rotary die fixing seat hole, a key groove is processed on the rotary die, and the rotary die is limited through a first flat key; the rotary die and the rotary die fixing seat hole are in tight fit; the rotary die fixing seat is arranged on the bearing inner ring and is tightly matched with the bearing inner hole; the bearing is arranged on the frame, and the bearing is tightly matched with the frame hole.
Furthermore, a key groove is formed in the outer surface of the extrusion container, the extrusion container is placed in a seat hole of the extrusion container fixing seat, and the extrusion container is limited through a second flat key; the extrusion cylinder is loosely matched with the extrusion cylinder fixing seat, a high-finish taper hole is processed in the extrusion cylinder along the axis center, and a metal pipe material is placed in the taper hole; the extrusion container fixing seat is fixed on the frame through a bolt.
Furthermore, a blind hole is processed at the front end of the lead screw, and the extrusion ejector rod fixing head is arranged in the blind hole. The lead screw is matched with the lead screw nut, the lead screw nut is provided with a key groove, the lead screw nut is arranged in the rack fixing hole and is limited through a third flat key.
Furthermore, the rotary die is cylindrical, a spiral through hole with an internal spiral is formed in the center of the axis of the cylinder, and the spiral through hole is consistent with the shape of the screw pump rotor.
Furthermore, the rotary die is divided into an upper die and a lower die which are connected through a positioning pin; the rotary die can also be divided into multiple parts, and all the parts are connected through positioning pins.
The invention has the beneficial effects that:
1. the screw pump rotor does not generate cutting waste or generates little cutting waste in the rotary die extrusion processing process, and the material utilization rate is extremely high;
2. the cost of the rotary die extrusion equipment and the processing is lower than the cost of cutting and processing;
3. the rotor is extruded and processed by the rotary die, so that the forming speed is higher and the efficiency is higher;
4. the rotary die extrusion processing technology has low requirements on the knowledge level and the personal skill of personnel, is simple and easy to learn, is convenient to operate, and is energy-saving and environment-friendly.
Drawings
Fig. 1 is a schematic diagram showing a principle of a screw pump equal-wall-thickness hollow rotor rotary die extrusion forming process according to an embodiment of the invention.
Fig. 2 is a schematic cross-sectional view taken along line a-a of fig. 1.
FIG. 3 is a schematic structural diagram of a rotary die extrusion molding device for a screw pump with a hollow rotor having an equal wall thickness according to an embodiment.
Fig. 4 is a schematic cross-sectional view of B-B in fig. 3.
Fig. 5 is a schematic view of the rotary die structure in the embodiment.
Fig. 6 is a schematic structural diagram of an upper mold in the embodiment.
FIG. 7 is a schematic view of the structure of the lower mold in the embodiment.
Wherein: 1-rotary die, 2-extrusion cylinder, 3-extrusion ejector rod, 4-hollow screw, 5-frame, 6-lead screw, 7-extrusion cylinder fixing seat, 8-rotary die fixing seat, 9-first flat key (rotary die), 10-bearing, 11-second flat key (extrusion cylinder), 12-bolt, 13-lead screw nut, 14-third flat key (lead screw nut), 15-upper die, 16-lower die and 17-positioning pin.
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.
As shown in fig. 3-4, the rotary die extrusion molding device for the hollow rotor with equal wall thickness of the screw pump according to the embodiment of the invention comprises a frame 5, a screw rod 6, an extrusion container 2, an extrusion container fixing seat 7, an extrusion ejector rod 3, a rotary die 1 and a rotary die fixing seat 8;
preferably, the rotary die 1 is arranged in a hole of the rotary die fixing seat 8, a key groove is processed on the rotary die 1, and the rotary die 1 is limited by a first flat key 9; the holes of the rotary die 1 and the rotary die fixing seat 8 are in tight fit; the rotary die fixing seat 8 is arranged on an inner ring of the bearing 10, and the rotary die fixing seat 8 is tightly matched with an inner hole of the bearing; the bearing 10 is arranged on the frame 5, and the bearing 10 is tightly matched with the hole of the frame 5;
preferably, the outer surface of the extrusion container 2 is provided with a key groove, and the extrusion container 2 is placed in a seat hole of the extrusion container fixing seat 7 and limited by the second flat key 11. The extrusion container 2 is loosely matched with the extrusion container fixing seat 7, a high-finish taper hole is processed in the extrusion container 2 along the axis center, and a metal pipe material is placed in the taper hole; the extrusion container fixing seat 7 is fixed on the frame 5 through a bolt;
preferably, the front end of the screw rod 6 is provided with a blind hole, and the fixed head of the extrusion mandril 3 is arranged in the blind hole. The screw 6 is matched with a screw nut 13, the screw nut 13 is provided with a key groove, and the screw nut 13 is placed in a fixed hole of the rack 5 and limited by a third flat key 14;
preferably, as shown in fig. 5, the rotary die 1 is a cylinder, a spiral through hole with an internal spiral is formed in the center of the axis of the cylinder, and the spiral through hole is consistent with the shape of the screw pump rotor; the rotary die 1 is divided into two parts or more parts which are connected through positioning pins; preferably, as shown in fig. 6 to 7, the rotary die 1 is divided into an upper die 15 and a lower die 16, and the upper die 15 and the lower die 16 are connected by a positioning pin.
As shown in the figures 1-2, without loss of generality, the rotary die extrusion forming process of the constant-wall-thickness hollow rotor of the screw pump is described by taking a single-screw pump rotor of G50 model as an example:
s1, lower 304 stainless steel tube material, inner hole phi 40, excircle diameter phi 50 and length 320 mm. Annealing treatment, wherein the hardness of the softened bar stock is reduced to below 200 HV; if the model of the pipe material is different from that of the finished product, turning the excircle diameter to phi 50;
s2, pre-treating the rotary die 1, the extrusion cylinder 2 and the softened metal pipe material before extrusion, and lubricating the contact surfaces of the rotary die 1 and the extrusion cylinder 2, which are in contact with the metal pipe material, and the surface of the metal pipe material by using lubricants such as graphite, molybdenum disulfide and the like;
s3, putting the lubricated metal tube material into an extrusion cylinder 2, setting the movement speed and pressure of an extrusion mandril 3 of the screw pump rotor extrusion forming device, and setting the rotating speed and torque of a rotary die 1; when the metal tube is extruded by a screw pitch length (65mm), the rotary die 1 completes 360 DEG rotation. The pressure set by the extrusion mandril ensures that the stress level born by the pipe material in the rotary die is higher than the yield strength of the pipe material and generates permanent deformation. The torque set by the rotary die 1 can ensure that the pipe material can smoothly rotate in the rotary die; the determination of the specific pressure and torque is determined by experiment or calculation.
The metal pipe material is of a spatial spiral structure after extrusion molding, and the screw pitch of 65mm, the eccentricity of 2.5mm, the section diameter phi 50 and the surface quality all meet the design requirements of the size of a screw pump rotor.
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 (9)
1. The rotary die extrusion forming process of the hollow rotor with the same wall thickness of the screw pump is characterized by comprising the following steps of:
s1, discharging a metal pipe material, softening the metal pipe material, and turning an outer circle;
s2, performing lubrication pretreatment before extrusion on the metal pipe material, the rotary die and the extrusion cylinder which are processed by the S1;
s3, placing the metal tube material subjected to the lubricating treatment into the extrusion cylinder, and setting the movement speed and pressure of the extrusion ejector rod and the rotation angular speed and torque of the rotary die; carrying out extrusion forming on the metal pipe material to obtain a finished product;
in step S3, in the process of forming the hollow rotor with equal wall thickness of the screw pump, the rotating angular speed of the rotary die and the moving speed of the extrusion mandril satisfy the following relational expression:
in the formula, omega is the rotating angular speed of the rotating die; v is the movement speed of the extrusion mandril; s is the rotor pitch; d is the diameter of the horizontal projection circle of the rotor spiral line.
2. The rotary die extrusion forming process of the hollow rotor with the wall thickness such as the screw pump and the like according to claim 1, wherein the metal pipe material is made of stainless steel, copper or composite metal.
3. The rotary die extrusion molding process of a hollow rotor with a wall thickness such as a screw pump according to claim 2, wherein in step S1, the softening treatment is specifically: and annealing the metal pipe material, wherein the hardness of the processed metal pipe material is not higher than 200 HV.
4. A rotary die extrusion forming device for a screw pump with a hollow rotor with equal wall thickness is used for the rotary die extrusion forming process of the screw pump with the hollow rotor with equal wall thickness according to any one of claims 1 to 3, and is characterized in that the forming device comprises a rack, a screw driving motor and a speed reducer, an extrusion barrel fixing seat, an extrusion ejector rod, a rotary die fixing seat driving motor, a speed reducer and a rotary die fixing seat;
the extrusion cylinder is used for placing metal pipe materials;
the screw rod is positioned at the rear end of the extrusion container and drives the extrusion ejector rod to move in the extrusion container under the drive of a screw rod driving motor and a speed reducer so as to realize the extrusion of the metal pipe material;
the rotary die is positioned at the front end of the extrusion container, and a spiral through hole is formed in the center of the axis of the rotary die; the rotary die rotates around the axis under the driving of the rotary die fixing seat driving motor and the speed reducer, and the metal pipe material extruded by the extrusion ejector rod is formed into a hollow rotor with the wall thickness of a screw pump and the like;
the extrusion container is arranged on the extrusion container fixing seat; the rotary die is arranged on the rotary die fixing seat; the lead screw and the extrusion container fixing seat are both arranged on the rack; the rotary die mounting seat is mounted on the rack through a bearing;
in the forming process of the hollow rotor with equal wall thickness of the screw pump, the rotating angular speed of the rotating die and the movement speed of the extrusion mandril satisfy the following relational expression:
in the formula, omega is the rotating angular speed of the rotating die; v is the movement speed of the extrusion mandril; s is the rotor pitch; d is the diameter of the horizontal projection circle of the rotor spiral line.
5. The rotary die extrusion forming device for the hollow rotor with the equal wall thickness of the screw pump according to claim 4, wherein the rotary die is installed in a rotary die fixing seat hole, a key groove is processed on the rotary die, and the rotary die is limited by a first flat key; the rotary die and the rotary die fixing seat hole are in tight fit; the rotary die fixing seat is arranged on the bearing inner ring and is tightly matched with the bearing inner hole; the bearing is arranged on the frame, and the bearing is tightly matched with the frame hole.
6. The rotary die extrusion forming device for the hollow rotor with the equal wall thickness of the screw pump according to claim 4, wherein the key groove is formed in the outer surface of the extrusion container, and the extrusion container is placed in a seat hole of a fixed seat of the extrusion container and limited by a second flat key; the extrusion cylinder is loosely matched with the extrusion cylinder fixing seat, a high-finish taper hole is processed in the extrusion cylinder along the axis center, and a metal pipe material is placed in the taper hole; the extrusion container fixing seat is fixed on the frame through a bolt.
7. The rotary die extrusion molding device for the hollow rotor with the equal wall thickness of the screw pump according to claim 4, wherein the front end of the screw rod is provided with a blind hole, and the extrusion ejector rod fixing head is arranged in the blind hole; the lead screw is matched with the lead screw nut, the lead screw nut is provided with a key groove, the lead screw nut is arranged in the rack fixing hole and is limited through a third flat key.
8. The rotary die extrusion molding device for the hollow rotor with the equal wall thickness of the screw pump according to claim 4, wherein the rotary die is cylindrical in shape, a spiral through hole with an internal spiral is formed in the center of the axis of the cylinder, and the spiral through hole is consistent with the shape of the rotor of the screw pump; the rotary die is divided into two parts or a plurality of parts which are connected through positioning pins.
9. The rotary die extrusion molding apparatus for hollow rotors with equal wall thickness of a screw pump according to claim 8, wherein the rotary die is divided into an upper die and a lower die, and the upper die and the lower die are connected by a positioning pin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010124192.2A CN111229848B (en) | 2020-02-27 | 2020-02-27 | Rotary die extrusion forming process and device for hollow rotor with equal wall thickness of screw pump |
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| CN202010124192.2A CN111229848B (en) | 2020-02-27 | 2020-02-27 | Rotary die extrusion forming process and device for hollow rotor with equal wall thickness of screw pump |
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| CN111229848B true CN111229848B (en) | 2021-05-18 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111940689B (en) * | 2020-06-24 | 2022-04-19 | 合肥工业大学 | Mold for manufacturing screw rotor through additive technology and using method thereof |
| CN112518239B (en) * | 2020-11-13 | 2022-02-08 | 浙江海洋大学 | Screw pump rotor rotary die extrusion forming process |
| CN112483385A (en) * | 2020-12-09 | 2021-03-12 | 耐驰（兰州）泵业有限公司 | Welded thin-wall hollow rotor for screw pump and machining method and application |
| CN113399484B (en) * | 2021-05-11 | 2023-03-28 | 广东斯坦德流体***有限公司 | Screw pump bush forming machine |
| CN113894172B (en) * | 2021-10-13 | 2022-11-15 | 北京科技大学 | Screw rod double-roller driving extrusion forming device and process |
| CN113894170B (en) * | 2021-10-13 | 2022-11-15 | 北京科技大学 | Double-roller driving extrusion forming device and process for hollow screw rod |
| CN113894171B (en) * | 2021-10-13 | 2022-12-02 | 北京科技大学 | Screw rod three-roller driving extrusion forming device and process |
| 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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