CN112222252A - High-precision low-cost equal-wall-thickness single-screw pump hollow rotor forming equipment and process - Google Patents

High-precision low-cost equal-wall-thickness single-screw pump hollow rotor forming equipment and process Download PDF

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Publication number
CN112222252A
CN112222252A CN202011149591.0A CN202011149591A CN112222252A CN 112222252 A CN112222252 A CN 112222252A CN 202011149591 A CN202011149591 A CN 202011149591A CN 112222252 A CN112222252 A CN 112222252A
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CN
China
Prior art keywords
die
sliding seat
seamless steel
screw pump
hollow rotor
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CN202011149591.0A
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Chinese (zh)
Inventor
林重
严岭
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Wuhan Perfect Geometry Electromechanical Equipment Co ltd
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Wuhan Perfect Geometry Electromechanical Equipment Co ltd
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Priority to CN202011149591.0A priority Critical patent/CN112222252A/en
Publication of CN112222252A publication Critical patent/CN112222252A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/06—Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form
    • 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
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/22—Auxiliary equipment, e.g. positioning devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/13—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by linearly moving tables

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Pumps (AREA)

Abstract

The invention discloses high-precision low-cost equal-wall-thickness single-screw pump hollow rotor forming equipment and a process, which comprise a forming die, a pressure mechanism, a seamless steel pipe and a feeding mechanism, wherein the forming die comprises an upper die and a lower die, a lower sliding seat and an upper sliding seat are arranged on the upper side of the pressure mechanism, the upper sliding seat is arranged on the upper side of the lower sliding seat, the lower die and the upper die are respectively fixed at one end, close to the lower sliding seat and the upper sliding seat, of the lower sliding seat, a rack arranged along the transverse length direction of the feeding mechanism is fixed on one side of the feeding mechanism, the upper end of the feeding mechanism is connected with a clamping mechanism in a sliding mode, a second servo motor is fixed at the upper end of a base of the clamping mechanism, a gear is fixed at the end part of an output shaft of the second servo. The invention has the advantages of wide raw material source, low price, simple equipment requirement and few process links, and can greatly reduce the processing cost of the hollow rotors with the wall thickness such as a single-screw pump and the like.

Description

High-precision low-cost equal-wall-thickness single-screw pump hollow rotor forming equipment and process
Technical Field
The invention relates to the technical field of single-screw pump part production, in particular to high-precision low-cost equal-wall-thickness single-screw pump hollow rotor forming equipment and a process.
Background
In the single screw pump, the hollow rotor has the advantages of light weight, material saving, easy installation and the like compared with a solid rotor. The hollow rotor of the single-screw pump with the same specification is 50% -80% lighter than the solid rotor, and because the rotor eccentrically rotates in the cavity of the stator, the hollow rotor can reduce vibration obviously, reduce starting torque and prolong the service life of the single-screw pump.
Because the rotor of the single-screw pump needs to be in interference fit with the stator cavity, and the amount of interference fit needs to be in a proper range, the lead precision, the eccentricity and the section size precision of the hollow rotor are required to be higher. The invention provides the forming equipment of the hollow rotor with the equal wall thickness, which has higher requirements on the forming equipment process of the hollow rotor with the equal wall thickness, and greatly increases the production cost due to high process requirements.
Disclosure of Invention
Objects of the invention
In order to solve the technical problems in the background technology, the invention provides the equipment for forming the hollow rotor of the single-screw pump with high precision, low cost and equal wall thickness, the raw material source is wide, the price is low, the equipment requirement is simple, the process links are few, and the processing cost of the hollow rotor of the single-screw pump with equal wall thickness can be greatly reduced.
(II) technical scheme
The invention provides high-precision low-cost equal-wall-thickness single-screw pump hollow rotor forming equipment, which comprises a forming die, a pressure mechanism, a seamless steel pipe and a feeding mechanism, wherein the forming die comprises an upper die and a lower die, a lower sliding seat and an upper sliding seat are arranged on the upper side of the pressure mechanism, the upper sliding seat is positioned on the upper side of the lower sliding seat, the lower die and the upper die are respectively fixed at one end, close to the lower sliding seat and the upper sliding seat, of the lower sliding seat, a rack arranged along the transverse length direction of the feeding mechanism is fixed on one side of the feeding mechanism, a clamping mechanism is connected to the upper end of the feeding mechanism in a sliding manner, a second servo motor is fixed on the upper end of a base of the clamping mechanism, a gear is fixed at the end part of an output shaft of the second servo motor, the gear is in meshing transmission with the rack, a clamping, a first servo motor is fixed at the upper end of the clamping mechanism, a synchronous belt wheel is connected to the end portion of an output shaft of the clamping mechanism, and the synchronous belt wheel is in synchronous transmission connection with the clamping jaw through a synchronous belt.
Preferably, a cavity curved surface is processed on one side of the upper die close to one side of the lower die.
Preferably, the inlet end of the cavity formed by the matched upper die and lower die forms a circle with the diameter of D1, the outlet end cavity formed by the matched upper die and lower die forms a circle with the diameter of D2, D1 is larger than D2, and D1 is connected to D2 through a special smooth curved surface of the cavity.
Preferably, the circle with diameter D1 is not concentric with the circle with diameter D2.
Preferably, a chamfer R1 with a specific size range is arranged at the intersection of the mold cavity and part of or all of the parting surfaces;
the upper die and the lower die can be composed of one or more dies;
after the upper die and the lower die are assembled, a section of spiral cavity identical to the rotor of the single-screw pump is formed on one side of the outlet end, and a chamfer angle can be arranged at the intersection of the cavity and part of parting surfaces or all the parting surfaces.
Preferably, the first servo motor and the second servo motor are controlled by a numerical control system or a PLC and can be linked, and the numerical control system or the PLC also controls the opening and closing of the lower sliding seat and the upper sliding seat of the pressure mechanism.
A single-screw pump hollow rotor molding process using the equipment comprises the following steps:
s1, selecting a seamless steel pipe as a blank material of the hollow rotor, and turning or polishing the seamless steel pipe to smooth the surface of the seamless steel pipe;
s2, clamping one end of the seamless steel tube on a clamping mechanism, placing the other end of the seamless steel tube into a forming die cavity, and driving an upper die and a lower die to separate by a pressure mechanism;
s3, controlling a second servo motor and a first servo motor by a numerical control system, driving a feeding mechanism to advance and a clamping mechanism to rotate, enabling the seamless steel pipe to advance a small distance and rotate an angle, and enabling the part of the seamless steel pipe in the mould to move along the cavities of the upper mould and the lower mould as far as possible by the advancing distance and the rotating angle;
s4, after the seamless steel tube stops moving, the numerical control system sends an instruction to enable the second servo motor to be disabled, the second servo motor loses the holding torque, and the movement of the clamping mechanism on the feeding mechanism is not restrained;
s5, the numerical control system controls the lower sliding seat and the upper sliding seat on the upper side of the pressure mechanism to move oppositely to drive the upper die and the lower die to be closed, the die gradually presses a straight seamless steel pipe into a spiral shape in the process of closing the die, and the diameter D1 of the seamless steel pipe is gradually compressed to the diameter D2 of a spiral pipe in the pressing process, so that the metal of the seamless steel pipe generates radial plastic deformation, the plastic deformation process can enable the metal to generate metal memory and overcome elastic deformation, and the section diameter and the lead of the hollow rotor reach a higher precision;
s6, because the plastic deformation process of the seamless steel tube can generate certain axial force and make the seamless steel tube outside the mould generate slight axial movement, at the moment, the movement of the clamping mechanism in the axial direction of the seamless steel tube is not restrained, and the clamping mechanism slides on the feeding mechanism by the axial force, thereby offsetting the adverse effect brought by the movement;
s7, after the upper die and the lower die are closed and reach a certain pressure, the numerical control system sends out an instruction to control the lower slide and the upper slide to move reversely and drive the upper die and the lower die to be separated;
s8, after the upper die and the lower die are separated by a distance, the numerical control system sends out a command to repeat the steps S3-S7, and the seamless steel tube is gradually compressed into a spiral hollow rotor of the single-screw pump through the repeated action.
Compared with the prior art, the invention has the beneficial effects that:
the seamless steel pipe is used as a raw material, so that the purchase cost of the raw material can be reduced, the process requirement in manufacturing can be simplified through the upper die and the lower die with special cavities, and the processing cost of the hollow rotors with the wall thicknesses such as the single-screw pump and the like is greatly reduced.
Drawings
FIG. 1 is a front view of a high-precision low-cost equal-wall-thickness single-screw pump hollow rotor molding device provided by the invention;
FIG. 2 is a side view of an upper mold and a lower mold of a hollow rotor forming device of a single-screw pump with high precision, low cost and equal wall thickness;
FIG. 3 is another side view of the upper mold and the lower mold of the molding equipment for the hollow rotor of the single-screw pump with high precision, low cost and equal wall thickness.
In the figure: the device comprises a pressure mechanism 1, a lower sliding seat 2, an upper sliding seat 3, an upper die 4, a lower die 5, a seamless steel pipe 6, a clamping jaw 7, a clamping mechanism 8, a first servo motor 9, a synchronous belt 10, a second servo motor 11, a gear 12, a rack 13 and a feeding mechanism 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in figures 1-3, the invention provides a high-precision low-cost equal-wall-thickness single-screw pump hollow rotor molding device, which comprises a molding die, a pressure mechanism 1, a seamless steel pipe 6 and a feeding mechanism 14, wherein the molding die comprises an upper die 4 and a lower die 5, a lower slide seat 2 and an upper slide seat 3 are installed on the upper side of the pressure mechanism 1, the upper slide seat 3 is positioned on the upper side of the lower slide seat 2, the lower die 5 and the upper die 4 are respectively fixed at one end of the lower slide seat 2, which is close to the upper slide seat 3, a rack 13 arranged along the transverse length direction of the feeding mechanism 14 is fixed on one side of the feeding mechanism 14, a clamping mechanism 8 is connected to the upper end of the feeding mechanism 14 in a sliding manner, a second servo motor 11 is fixed on the upper end of a base of the clamping mechanism 8, a gear 12 is fixed on the end of an output shaft of the second servo motor 11, the, and the other end of the seamless steel tube 6 is positioned between the upper die 4 and the lower die 5, the upper end of the clamping mechanism 8 is fixed with a first servo motor 9, the end part of an output shaft of the clamping mechanism 8 is connected with a synchronous belt pulley, and the synchronous belt pulley is in synchronous transmission connection with the clamping jaw 7 through a synchronous belt 10.
In an alternative embodiment, the sides of the upper mold 4 and the lower mold 5 adjacent to each other are both processed with cavity curved surfaces.
In an alternative embodiment, the inlet end of the cavity formed by the upper mold 4 and the lower mold 5 after they are closed forms a circle with a diameter D1, the outlet end of the cavity formed by the upper mold 4 and the lower mold 5 after they are closed forms a circle with a diameter D2, D1 is larger than D2, and D1 is connected to D2 by a special smooth curved surface of the cavity.
In an alternative embodiment, the circle with diameter D1 is not concentric with the circle with diameter D2.
In an alternative embodiment, the intersection of the mold cavity and part or all of the parting plane has a chamfer R1 with a specific size range;
the upper die 4 and the lower die 5 can be composed of one or more dies;
after the upper die 4 and the lower die 5 are matched, a section of spiral cavity which is the same as the rotor of the single-screw pump is formed on one side of the outlet end, and a chamfer angle can be arranged at the intersection of the cavity and part of or all parting surfaces.
In an alternative embodiment, the first servo motor 9 and the second servo motor 11 are controlled by a numerical control system or a PLC and can be linked, and the numerical control system or the PLC also controls the opening and closing of the lower slide 2 and the upper slide 3 of the pressure mechanism 1.
A single-screw pump hollow rotor molding process using the equipment comprises the following steps:
s1, selecting the seamless steel tube 6 as a blank material of the hollow rotor, and polishing the seamless steel tube 6 to smooth the surface by turning or polishing;
s2, clamping one end of the seamless steel tube 6 on the clamping mechanism 8, placing the other end of the seamless steel tube into a forming die cavity, and driving the upper die 4 and the lower die 5 to separate by the pressure mechanism 1;
s3, the numerical control system controls the second servo motor 11 and the first servo motor 9 to drive the feeding mechanism 14 to advance and the clamping mechanism 8 to rotate, so that the seamless steel tube 6 advances for a short distance and rotates for an angle, and the advancing distance and the rotating angle of the seamless steel tube 6 enable the part of the seamless steel tube 6 in the mold to move along the cavities of the upper mold 4 and the lower mold 5 as far as possible;
s4, after the seamless steel tube 6 stops moving, the numerical control system sends an instruction to enable the second servo motor 11 to be disabled, the second servo motor 11 loses the holding torque, and the movement of the clamping mechanism 8 on the feeding mechanism 14 is not restricted;
s5, the numerical control system controls the lower slide seat 2 and the upper slide seat 3 on the upper side of the pressure mechanism 1 to move oppositely, drives the upper mold 4 and the lower mold 5 to mold, the mold gradually presses the straight seamless steel tube 6 into a spiral shape in the mold closing process, and as the diameter D1 of the seamless steel tube 6 is gradually compressed to the diameter D2 of the spiral tube in the pressing process, the metal of the seamless steel tube generates radial plastic deformation, and the plastic deformation process can enable the metal to generate metal memory and overcome elastic deformation, so that the section diameter and the lead of the hollow rotor reach a higher precision;
s6, because the plastic deformation process of the seamless steel tube 6 can generate certain axial force and make the seamless steel tube 6 outside the mould generate slight axial movement, at this time, the movement of the clamping mechanism 8 in the axial direction of the seamless steel tube 6 is not restrained, and the clamping mechanism 8 slides on the feeding mechanism 14 by the axial force, thereby offsetting the adverse effect caused by the movement;
s7, after the upper die 4 and the lower die 5 are closed and reach a certain pressure, the upper die 4 and the lower die 5 are driven by the relative movement of the lower sliding seat 2 and the upper sliding seat 3, the numerical control system sends an instruction to control the lower sliding seat 2 and the upper sliding seat 3 to move reversely and drive the upper die 4 and the lower die 5 to separate;
s8, after the upper die 4 and the lower die 5 are separated by a certain distance, the numerical control system sends out a command to repeat the steps S3-S7, and the seamless steel tube 6 is gradually compressed into a spiral hollow rotor of the single-screw pump through the repeated action.
The working principle is as follows: because the rotor of the single-screw pump needs to be in interference fit with the stator cavity, and the amount of interference fit needs to be in a proper range, the lead precision, the eccentricity and the section size precision of the hollow rotor are required to be higher. In the embodiment, one end of a seamless steel pipe 6 is clamped on a clamping mechanism 8, the other end of the seamless steel pipe is placed in a forming die cavity, a pressure mechanism 1 drives an upper die 4 to be separated from a lower die 5, a numerical control system controls a second servo motor 11 and a first servo motor 9 to drive a feeding mechanism 14 to advance and a clamping mechanism 8 to rotate, the seamless steel pipe 6 advances for a small distance and rotates for an angle, the advancing distance and the rotating angle of the seamless steel pipe 6 enable the part of the seamless steel pipe 6 in the die to move along the die cavities of the upper die 4 and the lower die 5 as far as possible, after the movement of the seamless steel pipe 6 stops, the numerical control system sends an instruction to enable the movement of the clamping mechanism 8 on the feeding mechanism 14 to be free when the second servo motor 11 is disconnected, the numerical control system controls the lower sliding seat 2 and the upper sliding seat 3 on the upper side of the pressure mechanism 1 to move oppositely to drive the upper die 4 and the lower die 5 to be matched, the straight seamless steel pipe 6 is gradually pressed into a spiral shape in the die matching process by the die, the diameter D1 of the seamless steel pipe 6 is gradually compressed to the diameter D2 of a spiral pipe in the pressing process, so that the metal of the seamless steel pipe generates radial plastic deformation, the plastic deformation process can enable the metal to generate metal memory and overcome elastic deformation, the section diameter and the lead of the hollow rotor can reach a higher precision, a certain axial force can be generated in the plastic deformation process of the seamless steel pipe 6, the seamless steel pipe 6 outside the die generates slight axial movement, at the moment, the movement of the clamping mechanism 8 in the axial direction of the seamless steel pipe 6 is not restrained, the clamping mechanism 8 slides on the feeding mechanism 14 by the axial force, and adverse effects brought by the movement are counteracted, after the lower sliding seat 2 and the upper sliding seat 3 move relatively to drive the upper die 4 and the lower die 5 to be matched and reach a certain pressure, the numerical control system sends out an instruction to control the lower sliding seat 2 and the upper sliding seat 3 to move reversely and drive the upper die 4 and the lower die 5 to be separated, after the upper die 4 and the lower die 5 are separated by a certain distance, the numerical control system sends out an instruction to repeatedly advance the seamless steel pipe 6 for a small distance and rotate for an angle and follow-up action, and the seamless steel pipe 6 is gradually compressed into a spiral single-screw pump hollow rotor through the repeated action.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (7)

1. A high-precision low-cost equal-wall-thickness single-screw pump hollow rotor forming device is characterized by comprising a forming die, a pressure mechanism (1), a seamless steel pipe (6) and a feeding mechanism (14), wherein the forming die comprises an upper die (4) and a lower die (5), a lower sliding seat (2) and an upper sliding seat (3) are installed on the upper side of the pressure mechanism (1), the upper sliding seat (3) is located on the upper side of the lower sliding seat (2), the lower die (5) and the upper die (4) are respectively fixed at one end, close to each other, of the lower sliding seat (2) and the upper sliding seat (3), a rack (13) arranged along the transverse length direction of the feeding mechanism (14) is fixed on one side of the feeding mechanism (14), a clamping mechanism (8) is connected to the upper end of the feeding mechanism (14) in a sliding manner, a second servo motor (11) is fixed at the upper end of a base of the clamping mechanism (8), and a gear, gear (12) and rack (13) meshing transmission, one side of fixture (8) is rotated and is connected with clamping jaw (7) that are used for centre gripping seamless steel pipe (6), and the other end of seamless steel pipe (6) is located between mould (4) and bed die (5), the upper end of fixture (8) is fixed with first servo motor (9), and the output shaft end connection of fixture (8) has synchronous pulley, and synchronous pulley passes through hold-in range (10) and is connected with clamping jaw (7) synchronous transmission.
2. A high-precision low-cost single-screw pump hollow rotor forming device with equal wall thickness according to claim 1, characterized in that the sides of the upper die (4) and the lower die (5) close to each other are both provided with cavity curved surfaces.
3. A high precision low cost single screw pump hollow rotor forming equipment according to claim 2, characterized in that the inlet end of the cavity after the upper die (4) and the lower die (5) are closed forms a circle with diameter D1, the outlet end of the cavity after the upper die (4) and the lower die (5) are closed forms a circle with diameter D2, D1 is larger than D2, and D1 is connected to D2 through a special smooth curved surface of the cavity.
4. A high accuracy low cost constant wall thickness single screw pump hollow rotor molding apparatus as claimed in claim 3 wherein said circle of diameter D1 is not concentric with the circle of diameter D2.
5. A high-precision low-cost single-screw pump hollow rotor forming device with the same wall thickness as the hollow rotor of claim 4, wherein a chamfer R1 with a specific size range is arranged at the intersection of the die cavity and part of or all of the parting surfaces;
the upper die (4) and the lower die (5) can be composed of one or more dies;
and after the upper die (4) and the lower die (5) are closed, a section of spiral cavity identical to the rotor of the single-screw pump is formed on one side of the outlet end, and a chamfer angle can be arranged at the intersection of the cavity and part of or all parting surfaces.
6. The high-precision low-cost single-screw pump hollow rotor forming equipment with the same wall thickness as the claim 1 is characterized in that the first servo motor (9) and the second servo motor (11) are controlled by a numerical control system or a PLC (programmable logic controller) and can be linked, and the numerical control system or the PLC controls the opening and closing of the lower sliding seat (2) and the upper sliding seat (3) of the pressure mechanism (1).
7. A process for forming a hollow rotor of a single-screw pump using an apparatus according to any one of claims 1 to 6, comprising the steps of:
s1, selecting the seamless steel tube (6) as a blank material of the hollow rotor, and polishing the seamless steel tube (6) to smooth the surface by turning or polishing;
s2, clamping one end of the seamless steel tube (6) on the clamping mechanism (8), placing the other end of the seamless steel tube into a forming die cavity, and driving the upper die (4) and the lower die (5) to separate by the pressure mechanism (1);
s3, controlling a second servo motor (11) and a first servo motor (9) by a numerical control system, driving a feeding mechanism (14) to advance and a clamping mechanism (8) to rotate, enabling a seamless steel pipe (6) to advance for a short distance and rotate for an angle, and enabling the part of the seamless steel pipe (6) in the mould to move along the cavities of an upper mould (4) and a lower mould (5) as far as possible by the advancing distance and the rotating angle;
s4, after the seamless steel tube (6) stops moving, the numerical control system sends an instruction to enable the second servo motor (11) to be disabled, the second servo motor (11) loses the holding torque, and the movement of the clamping mechanism (8) on the feeding mechanism (14) is not restricted;
s5, the lower sliding seat (2) and the upper sliding seat (3) on the upper side of the pressure mechanism (1) are controlled by a numerical control system to move oppositely to drive the upper die (4) and the lower die (5) to be closed, the straight seamless steel pipe (6) is gradually pressed into a spiral shape by the dies in the process of closing the dies, and as the diameter D1 of the seamless steel pipe (6) is gradually compressed to the diameter D2 of the spiral pipe in the pressing process, the metal of the seamless steel pipe generates radial plastic deformation, and the plastic deformation process can lead the metal to generate metal memory and overcome elastic deformation, so that the section diameter and the lead of the hollow rotor reach a higher precision;
s6, because the plastic deformation process of the seamless steel tube (6) can generate certain axial force and make the seamless steel tube (6) outside the mould generate slight axial movement, at the moment, the movement of the clamping mechanism (8) in the axial direction of the seamless steel tube (6) is not restricted, and the clamping mechanism (8) slides on the feeding mechanism (14) by the axial force, thereby offsetting the adverse effect caused by the movement;
s7, after the upper die (4) and the lower die (5) are closed and reach a certain pressure, the upper sliding seat (2) and the upper sliding seat (3) are driven by the relative movement of the lower sliding seat (2) and the upper sliding seat (3), the numerical control system sends an instruction to control the lower sliding seat (2) and the upper sliding seat (3) to move reversely and drive the upper die (4) and the lower die (5) to be separated;
s8, after the upper die (4) and the lower die (5) are separated by a certain distance, the numerical control system sends out a command to repeat the steps S3-S7, and the seamless steel tube (6) is gradually compressed into a spiral single-screw pump hollow rotor through the repeated action.
CN202011149591.0A 2020-10-23 2020-10-23 High-precision low-cost equal-wall-thickness single-screw pump hollow rotor forming equipment and process Pending CN112222252A (en)

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Application Number Priority Date Filing Date Title
CN202011149591.0A CN112222252A (en) 2020-10-23 2020-10-23 High-precision low-cost equal-wall-thickness single-screw pump hollow rotor forming equipment and process

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Application Number Priority Date Filing Date Title
CN202011149591.0A CN112222252A (en) 2020-10-23 2020-10-23 High-precision low-cost equal-wall-thickness single-screw pump hollow rotor forming equipment and process

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CN112222252A true CN112222252A (en) 2021-01-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113351691A (en) * 2021-06-18 2021-09-07 浙江明贺钢管有限公司 Full-automatic heavy-calibre steel pipe point correction equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113351691A (en) * 2021-06-18 2021-09-07 浙江明贺钢管有限公司 Full-automatic heavy-calibre steel pipe point correction equipment
CN113351691B (en) * 2021-06-18 2022-08-16 浙江明贺钢管有限公司 Full-automatic heavy-calibre steel pipe point correction equipment

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