CN111101158A - Demolding device and method for electroforming thin-wall seamless metal pipe with large length-diameter ratio - Google Patents
Demolding device and method for electroforming thin-wall seamless metal pipe with large length-diameter ratio Download PDFInfo
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- CN111101158A CN111101158A CN202010094943.0A CN202010094943A CN111101158A CN 111101158 A CN111101158 A CN 111101158A CN 202010094943 A CN202010094943 A CN 202010094943A CN 111101158 A CN111101158 A CN 111101158A
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- electroforming
- cylinder body
- magnetorheological fluid
- diameter ratio
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D1/00—Electroforming
- C25D1/02—Tubes; Rings; Hollow bodies
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D1/00—Electroforming
- C25D1/20—Separation of the formed objects from the electrodes with no destruction of said electrodes
Abstract
The invention discloses a demoulding device and a method for electroforming a thin-wall seamless metal pipe with a large length-diameter ratio, and belongs to the field of electroforming processing. The device mainly comprises a cylinder body, a guide rod, magnetorheological fluid, a magnet exciting coil, a lower base, an upper end cover with a circular through hole in the center, a core mold, an electroforming layer, a direct-current power supply and a tension device. According to this device, first, a core mold with an electroformed layer is fitted over a guide bar, and its end is coupled to a pulling device. And then, turning on a direct-current power supply, electrifying the exciting coil, solidifying the magnetorheological fluid, and changing the Newtonian fluid into a sticky plastic body, so that the cylinder body is connected with the electroforming layer into a whole. Then, the pulling device is started, and the core mold is drawn out under the action of the pulling force. And finally, the direct-current power supply is closed, the exciting coil is powered off, the magnetorheological fluid is recovered into Newtonian fluid from the viscous plastic, and the electroforming layer is taken out, so that demoulding is finished. The invention has the advantages of convenient operation, good demoulding effect, high clamping speed, high demoulding efficiency and low process cost.
Description
Technical Field
The invention belongs to the field of electroforming processing, and particularly relates to a demolding device and a demolding method for electroforming a thin-wall seamless metal pipe with a large length-diameter ratio.
Background
The metal fixing film is a thin-walled seamless metal tube having a large aspect ratio, which is one of important parts in a printer or a copying machine. At present, the metal fixing film is mainly prepared by methods such as stamping forming, electroforming forming and the like. Among them, the electroformed metal fixing film is favored by high-end application fields because of its advantages of ultra-thin wall thickness, high material performance, high precision, and the like. However, when a metal fixing film is produced by the electroforming method, the electroforming layer has a strong bonding force with the mandrel, and the metal pipe has a large length-diameter ratio and high fitting accuracy with the mandrel, so that the seamless metal pipe after electroforming is extremely difficult to remove from the mandrel.
Japanese patent nos. JP 2006-213960A and JP 2012-58644A perform mold release by injecting high-pressure liquid and high-pressure gas between the core mold and the electroformed layer, respectively, but are liable to cause tearing damage of the electroformed layer during the high-pressure liquid/gas introduction process, and they both rely on expensive dedicated equipment, resulting in high mold release costs. The patent with the application number of 201410688005.8 discloses a demoulding device and a demoulding method for a composite material thin-wall pipe with a large length-diameter ratio. Therefore, the development of a demolding device and a demolding method for the thin-wall seamless metal tube with large length-diameter ratio, which are simple in operation, good in demolding effect, low in demolding cost and high in demolding efficiency, is needed.
Disclosure of Invention
The object of the present invention is to provide a demolding device and method for electroforming a thin-walled seamless metal tube with a large length-to-diameter ratio, so as to solve the above-mentioned problems.
In order to achieve the purpose, the technical scheme of the invention is as follows: a demoulding device for electroforming a thin-wall seamless metal pipe with a large length-diameter ratio comprises a cylinder body, a guide rod, magnetorheological fluid, an excitation coil, a lower base, an upper end cover with a circular through hole in the center, a core mould, an electroforming layer, a direct-current power supply and a tension device; the inner surface of the cylinder is provided with grooves arranged along the circumferential direction at equal intervals; the core mold is in a hollow cylindrical shape; one end of the cylinder is fixedly and hermetically connected with the lower base, and the other end of the cylinder is detachably and hermetically connected with the upper end cover; the guide rod is fixedly arranged on the lower base, and the rotating central axis of the guide rod is superposed with the rotating central axis of the cylinder; the magnetorheological fluid is filled in a space formed by the lower base, the cylinder body and the upper end cover; the excitation coil is sleeved on the outer surface of the cylinder in an interference fit manner; the direct current power supply is in conductive connection with the excitation coil.
The material of the cylinder is electric insulation polypropylene.
The number of the grooves is 3 or more.
The particle size of the magnetic particles in the magnetorheological fluid is 1-50 nanometers, so that the solidified magnetorheological fluid is easier to embed in the microscopic depressions on the surface of the electroformed layer, and further a strong holding and dragging effect is generated on the electroformed layer.
A demoulding method for electroforming a thin-wall seamless metal pipe with a large length-diameter ratio comprises the following steps which are sequentially executed:
s1, sleeving the core mould with the electroforming layer on the outer surface on a guide rod in the demoulding device, and performing detachable transmission connection on the end part of the core mould and a tension device;
s2, turning on the direct-current power supply, energizing the exciting coil to excite the magnetic field, solidifying the magnetorheological fluid due to the characteristics (Newton fluid when no magnetic field exists, and Newton fluid is solidified into a viscous plastic body instantly when the magnetic field exists), and filling the magnetorheological fluid between the cylinder body and the electroforming layer in a viscous plastic state, embedding the magnetorheological fluid in the groove and the microscopic depression on the surface of the electroforming layer so as to reliably connect the cylinder body and the electroforming layer into a whole through the magnetorheological fluid at the moment;
s3, starting a tension device, drawing out the core mold under the action of tension, and continuously keeping the electroforming layer in the cylinder body due to the powerful holding and pulling action of the viscous-plastic magnetorheological fluid, thereby realizing the separation of the electroforming layer and the core mold;
and S4, turning off the direct-current power supply, powering off the excitation coil, removing the magnetic field, changing the magnetorheological fluid from the viscous plastic body into Newtonian fluid, removing the holding and pulling effect of the magnetorheological fluid on the electroformed layer, and taking out the electroformed layer to finish demolding.
The connection between the core mould and the tension device is a hinge connection.
Compared with the prior art, the invention has the beneficial effects that:
1. convenient operation and good demoulding effect. The magnetic field is excited by electrifying the exciting coil, the magnetic field is excited, the magnetorheological fluid is solidified into a sticky plastic body by the Newtonian fluid, the cylinder body and the electroforming layer are connected into a whole, the electroforming layer and the core mold can be effectively separated under the auxiliary action of the tension device, the operation is convenient, and the demolding effect is good.
2. The clamping speed is high, and the demoulding efficiency is high. The magnetorheological fluid can be solidified into a sticky plastic body by the Newtonian fluid in the presence of a magnetic field, and the solidification can be completed instantly (in millisecond magnitude), so that the clamping speed of the invention is higher, the time consumption is short, and the demoulding efficiency is high.
3. Has good adaptability. The magnetorheological fluid is Newtonian fluid in the absence of a magnetic field and has good fluidity, so that the magnetorheological fluid can reliably clamp core molds with different outer diameters within a certain range and has good adaptability.
4. The process cost is low. The invention has simple structure and easy realization, does not depend on expensive auxiliary equipment in the demoulding process, is suitable for large-batch production and has low process cost.
Drawings
FIG. 1 is a schematic cross-sectional view of a portion of the structure of the present invention.
Fig. 2 is a schematic cross-sectional view of the present invention.
Reference numbers and designations in the drawings: 1. a cylinder; 1-1, a groove; 2. a guide bar; 3. magnetorheological fluid; 4. a field coil; 5. a lower base; 6. an upper end cover; 6-1, a circular through hole; 7. a core mold; 8. an electroformed layer; 9. a direct current power supply; 10. a tension device.
Detailed Description
The following further describes the practice of the present invention in conjunction with the accompanying drawings.
As shown in fig. 1 and 2, a demolding device for electroforming a thin-wall seamless metal pipe with a large length-diameter ratio comprises a cylinder body 1, a guide rod 2, magnetorheological fluid 3, an excitation coil 4, a lower base 5, an upper end cover 6 with a circular through hole 6-1 in the center, a core mold 7, an electroforming layer 8, a direct-current power supply 9 and a tension device 10; the outer diameter of the cylinder body 1 is 60mm, the inner diameter is 50mm, the length is 300mm, and the material is electrically insulated polypropylene; the inner surface of the cylinder body 1 is provided with grooves 1-1 which are arranged along the circumferential direction at equal intervals; the core mold 7 is in a hollow cylindrical shape, has an outer diameter of 30mm, an inner diameter of 15mm, a length of 350mm, is made of 304 stainless steel, and has a surface roughness Rz = 0.025; one end of the cylinder 1 is fixedly and hermetically connected with the lower base 5, and the other end is detachably and hermetically connected with the upper end cover 6; the diameter of the guide rod 2 is 15mm, and the length is 250 mm; the guide rod 2 is fixedly arranged on the lower base 5 through a thread pair, and the rotating central axis of the guide rod is superposed with the rotating central axis of the cylinder 1; the magnetorheological fluid 3 is filled in a space formed by the lower base 5, the cylinder body 1 and the upper end cover 6; the excitation coil 4 is sleeved on the outer surface of the cylinder body 1 in an interference fit manner; the positive and negative poles of the direct current power supply 9 are respectively connected with the two ends of the excitation coil 4 in a conductive manner.
The number of the grooves 1-1 is 5.
The particle size of the magnetic particles in the magnetorheological fluid 3 is 25 nanometers.
A demolding method for electroforming a thin-wall seamless metal pipe with a large length-diameter ratio based on the device comprises the following steps which are sequentially executed:
s1, sleeving the mandrel 7 with the electroforming layer 8 on the outer surface, which is manufactured by the electroforming method, on the guide rod 2 in the demoulding device, and detachably connecting the end part of the mandrel with the tension device 10 through a hinge;
s2, turning on the direct-current power supply 9, electrifying the exciting coil 4, exciting the magnetic field, solidifying the magnetorheological fluid 3 due to the characteristics (Newton fluid when no magnetic field exists, and Newton fluid is solidified into a viscous plastic body instantly when the magnetic field exists), and filling the magnetorheological fluid 3 between the cylinder 1 and the electroforming layer 8 in a viscous plastic state and embedding the magnetorheological fluid in the groove 1-1 and the microscopic depression on the surface of the electroforming layer 8 so that the cylinder 1 and the electroforming layer 8 are reliably connected into a whole through the magnetorheological fluid 3 at the moment;
s3, starting the tension device 10, drawing out the core mold 7 under the action of tension, and keeping the electroforming layer 8 in the cylinder 1 because of the powerful holding and dragging action of the viscous-plastic magnetorheological fluid 3, thereby realizing the separation of the electroforming layer 8 and the core mold 7;
s4, the direct current power supply 9 is turned off, the exciting coil 4 is powered off, the magnetic field disappears, the magnetorheological fluid 3 is changed from a viscous plastic body into Newtonian fluid, the dragging effect of the magnetorheological fluid 3 on the electroforming layer 8 disappears, the electroforming layer 8 is taken out, demoulding is completed, and the electroforming layer 8 is the manufactured thin-wall seamless metal pipe with the large length-diameter ratio.
Claims (6)
1. A demoulding device for electroforming a thin-wall seamless metal pipe with a large length-diameter ratio is characterized in that: the device comprises a cylinder body (1), a guide rod (2), magnetorheological fluid (3), an excitation coil (4), a lower base (5), an upper end cover (6) with a circular through hole (6-1) in the center, a core mold (7), an electroforming layer (8), a direct current power supply (9) and a tension device (10); the inner surface of the cylinder body (1) is provided with grooves (1-1) which are arranged along the circumferential direction at equal intervals; the core mould (7) is in a hollow cylindrical shape; one end of the cylinder body (1) is fixedly and hermetically connected with the lower base (5), and the other end of the cylinder body is detachably and hermetically connected with the upper end cover (6); the guide rod (2) is fixedly arranged on the lower base (5), and the rotating central axis of the guide rod is superposed with the rotating central axis of the cylinder body (1); the magnetorheological fluid (3) is filled in a space formed by the lower base (5), the cylinder body (1) and the upper end cover (6); the excitation coil (4) is sleeved on the outer surface of the cylinder body (1) in an interference fit manner; the direct current power supply (9) is in conductive connection with the excitation coil (4).
2. A demolding device for electroforming a thin-walled seamless metal tube with a large length-to-diameter ratio as set forth in claim 1, wherein: the material of the cylinder body (1) is electric insulation polypropylene.
3. A demolding device for electroforming a thin-walled seamless metal tube with a large length-to-diameter ratio as set forth in claim 1, wherein: the number of the grooves (1-1) is more than 3.
4. A demolding device for electroforming a thin-walled seamless metal tube with a large length-to-diameter ratio as set forth in claim 1, wherein: the particle size of the magnetic particles in the magnetorheological fluid (3) is 1-50 nanometers.
5. A demoulding method for electroforming a thin-wall seamless metal pipe with a large length-diameter ratio is characterized in that: the method comprises the following steps of:
s1, sleeving a core mold (7) with an electroforming layer (8) on the outer surface on a guide rod (2) in a demolding device, and performing detachable transmission connection on the end part of the core mold and a tension device (10);
s2, a direct current power supply (9) is turned on, the excitation coil (4) is electrified to excite a magnetic field, the magnetorheological fluid (3) is solidified into a sticky plastic body instantly when the magnetic field exists due to the characteristics (Newton fluid when the magnetic field does not exist), and at the moment, the magnetorheological fluid (3) is filled between the cylinder body (1) and the electroforming layer (8) in a sticky plastic state mode and is embedded into the groove (1-1) and the microscopic depression on the surface of the electroforming layer (8), so that the cylinder body (1) and the electroforming layer (8) are reliably connected into a whole through the magnetorheological fluid (3);
s3, starting the tension device (10), drawing out the core mold (7) under the action of tension, and keeping the electroforming layer (8) in the cylinder body (1) because of the powerful holding and dragging action of the viscous-plastic magnetorheological fluid (3), thereby realizing the separation of the electroforming layer (8) and the core mold (7);
s4, the direct current power supply (9) is turned off, the excitation coil (4) is powered off, the magnetic field disappears, the magnetorheological fluid (3) is changed into Newtonian fluid from the viscous plastic body, the holding and pulling effect of the magnetorheological fluid (3) on the electroforming layer (8) disappears, and the demolding is finished after the electroforming layer (8) is taken out.
6. A demolding method for electroforming a thin-walled seamless metal tube with a large length-to-diameter ratio, as set forth in claim 5, wherein: the connection between the core mould (7) and the tension device (10) is a hinge connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010094943.0A CN111101158A (en) | 2020-02-17 | 2020-02-17 | Demolding device and method for electroforming thin-wall seamless metal pipe with large length-diameter ratio |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010094943.0A CN111101158A (en) | 2020-02-17 | 2020-02-17 | Demolding device and method for electroforming thin-wall seamless metal pipe with large length-diameter ratio |
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| CN111101158A true CN111101158A (en) | 2020-05-05 |
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| CN202010094943.0A Pending CN111101158A (en) | 2020-02-17 | 2020-02-17 | Demolding device and method for electroforming thin-wall seamless metal pipe with large length-diameter ratio |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112144081A (en) * | 2020-10-27 | 2020-12-29 | 河南理工大学 | Device for dissolving and removing metal capillary electroforming core mold and demolding method |
| CN113322498A (en) * | 2021-07-01 | 2021-08-31 | 河南理工大学 | Demolding device and method for electroforming thin-wall metal fixing tube |
-
2020
- 2020-02-17 CN CN202010094943.0A patent/CN111101158A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112144081A (en) * | 2020-10-27 | 2020-12-29 | 河南理工大学 | Device for dissolving and removing metal capillary electroforming core mold and demolding method |
| CN113322498A (en) * | 2021-07-01 | 2021-08-31 | 河南理工大学 | Demolding device and method for electroforming thin-wall metal fixing tube |
| CN113322498B (en) * | 2021-07-01 | 2022-09-06 | 河南理工大学 | Demolding device and method for electroforming thin-wall metal fixing tube |
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