CN210945820U - Core mould for electroforming to prepare thin-wall seamless metal round pipe - Google Patents
Core mould for electroforming to prepare thin-wall seamless metal round pipe Download PDFInfo
- Publication number
- CN210945820U CN210945820U CN201921981479.6U CN201921981479U CN210945820U CN 210945820 U CN210945820 U CN 210945820U CN 201921981479 U CN201921981479 U CN 201921981479U CN 210945820 U CN210945820 U CN 210945820U
- Authority
- CN
- China
- Prior art keywords
- mandrel
- metal round
- electroforming
- round pipe
- plug
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000002184 metal Substances 0.000 title claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 41
- 238000005323 electroforming Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
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Abstract
The patent of the utility model discloses a mandrel that is used for electroforming preparation thin wall seamless metal pipe belongs to electrochemical machining technical field. The core mould comprises a metal round pipe, an upper plug, a lower plug, a filling liquid and an electric lead column; the upper plug and the lower plug are respectively detachably connected with two ends of the metal round pipe in a sealing way; the filling liquid fills the cavity formed by the upper plug, the metal round pipe and the lower plug without gaps and bubbles. The utility model discloses easily realize, compact structure, the drawing of patterns is effectual, and its processing cost is low, and the practicality is strong.
Description
Technical Field
The utility model relates to an electrochemical machining technical field especially relates to a mandrel that is used for electroforming preparation thin wall seamless metal pipe.
Background
A metal fixing film is a thin-walled seamless round metal tube, which is one of important parts in a printer or a copier. At present, the metal fixing film is mainly prepared by methods such as stamping forming, electroforming forming and the like. Among them, the electroforming metal fixing film is attracting attention because of its advantages such as an ultra-thin wall thickness and high material properties. However, when a metal fixing film is produced by the electroforming method, the electroformed layer closely "embraces" the mandrel surface without a gap, and it is difficult to remove the electroformed seamless round metal tube from the mandrel at the time of releasing.
Because the core mold is generally made of metal materials such as stainless steel and the like, and the difference between the thermal expansion coefficient of the core mold and that of electroformed nickel (a common material for electroforming seamless metal tubes) is very small, when the core mold is demolded by adopting a thermal expansion and cold shrinkage method, the maximum demolding gap between the core mold and an electroformed layer can only reach a few micrometers, and demolding cannot be realized at all. Other demolding methods, such as japanese patent nos. JP 2006-. Therefore, it is necessary to develop a demolding device for electroforming a seamless metal tube, which is easy to implement, low in cost, and efficient.
Disclosure of Invention
The utility model aims at providing a mandrel for electroforming preparation thin wall seamless metal pipe to solve the problem mentioned in the above-mentioned.
In order to achieve the above purpose, the technical scheme of the utility model is that: a core mould for preparing a thin-wall seamless metal round pipe by electroforming comprises a metal round pipe, an upper plug, a lower plug, a filling liquid and an electric conduction column; the upper plug and the lower plug are respectively detachably connected with two ends of the metal round pipe in a sealing way; the filling liquid is filled in a cavity formed by the upper plug, the metal round pipe and the lower plug without gaps and bubbles.
The volume expansion coefficient α of the filling liquid is more than or equal to 0.0002 (1/DEG C), and the compression coefficient β is more than or equal to 4.5 × 10-4（1/MPa）。
The upper plug and the lower plug are made of acid and alkali corrosion resistant metal parts.
The electricity leading column is fixed on the upper plugging head.
The utility model has the advantages that:
1. easy to realize and compact in structure. The utility model discloses only need be at the inside packing liquid of mandrel to utilize the inside packing liquid to be heated (electroforming liquid temperature) the thermal expansion power that produces to swell mandrel diameter, shrink under the normal atmospheric temperature just can obtain big demoulding clearance, the drawing of patterns is easy, and in addition, drawing of patterns function (mechanism) and electroforming mandrel are integrated in an organic whole, and auxiliary component is few, compact structure.
2. Easy operation and good demoulding effect. Compare in such as demoulding method as mandrel self expend with heat and contract with cold, the utility model discloses do not need extra heating operation, only utilize the difference in temperature between electroforming liquid and the normal atmospheric temperature can obtain the required enough big clearance of drawing of patterns, easy operation.
3. The process cost is low, and the practicability is strong. The utility model discloses a drawing of patterns does not rely on expensive auxiliary assembly, and its radial variable quantity is in the elastic deformation of mandrel, and the mandrel can use repeatedly for a long time, is applicable to large batch production, and is with low costs.
Drawings
Fig. 1 is an overall view of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
Fig. 3 is a schematic view of the demolding principle of the present invention.
Reference numbers and designations in the drawings: 1. a metal round tube; 2. an upper plug; 3. a lower plug; 4. filling liquid; 5. a charging post; 6. an electroformed layer.
Detailed Description
The following describes the present invention with reference to the accompanying drawings.
As shown in fig. 1-2, a mandrel for manufacturing a thin-walled seamless metal round tube by electroforming comprises a metal round tube 1, an upper plug 2, a lower plug 3, a filling liquid 4 and an electric lead column 5; the metal round tube 1 has an outer diameter D =30mm, an inner diameter D =28mm, a length L =350mm, and is made of 45 steel (normalized); the upper plug 2 and the lower plug 3 are respectively detachably connected with two ends of the metal round pipe 1 in a sealing way; the filling liquid 4 fills the cavity formed by the upper plug 2, the metal round tube 1 and the lower plug 3 without gaps and bubbles.
The filling liquid 4 has a volume expansion coefficient of α =0.000208 (1/° c) and a compression coefficient of β =4.5 × 10-4Ultra pure water (1/MPa).
The upper plug 2 and the lower plug 3 are made of SUS304 stainless steel.
The electric conduction column 5 is welded and fixed on the upper plug 2.
The working principle of the utility model is as follows.
It can be calculated that the internal pressure at which the circular metal tube 1 in the core mold starts to undergo plastic deformation is
=23.43MPa（
) Therefore, when the internal pressure P of the core mold does not exceed 23.43MPa, the core mold is elastically deformed.
The mandrel is transferred from the normal temperature of 20 ℃ to the electroforming solution with the temperature of 55 ℃ (the conventional value of the electroforming solution temperature) for electroforming. The volume of the filling liquid 4 is thermally expanded under the influence of the temperature of the electroforming liquid, and the outer diameter of the core mold is expanded by delta D (about 24.30 mu m) due to the expansion force generated by the filling liquid 4 under the closed space
). At this time, the internal pressure P of the core mold is approximately equal to 12.32MPa <
（
) Therefore, the core mold is in the elastic deformation stage and does not generate plastic deformation. When the electrocasting layer 6 reaches a desired thickness, electrocasting is stopped and the mandrel with the electrocasting layer 6 is taken out from the electrocasting solution (a sectional view is shown in FIG. 3 (a)).
The core mold with the electrocast layer 6 is placed at a normal temperature of 20 ℃, the volume of the filling liquid 4 inside the core mold is restored to the original state, and the outer diameter of the core mold is also shrunk to restore the original size. At this time, a mold release gap (shown in fig. 3 (b)) of Δ H = Δ D ≈ 24.30 μm is formed between the core mold and the electroformed layer 6, and the presence of this mold release gap makes mold release very easy, and the desired thin-walled seamless circular metal tube is obtained by removing the electroformed layer 6.
The symbols referred to in the above calculation formula have the following meanings.
Delta T is the temperature change amount of the filling liquid 4, delta D is the outer diameter expansion amount of the mandrel, α is the volume expansion coefficient of the filling liquid 4, β is the compression coefficient of the filling liquid 4, sigma s is the yield strength of the metal round pipe 1 material, E is the elastic modulus of the metal round pipe 1 material, gamma is the Poisson coefficient of the metal round pipe 1 material, D is the outer diameter of the metal round pipe 1, D is the inner diameter of the metal round pipe 1, and P is the inner pressure of the mandrel.
Claims (4)
1. A mandrel for manufacturing a thin-wall seamless metal round pipe by electroforming is characterized in that: the device comprises a metal round pipe (1), an upper plug (2), a lower plug (3), filling liquid (4) and an electric lead column (5); the upper plug (2) and the lower plug (3) are respectively detachably connected with two ends of the metal round pipe (1) in a sealing way; the filling liquid (4) fills the cavity formed by the upper plug (2), the metal round tube (1) and the lower plug (3) without gaps and bubbles.
2. The mandrel of claim 1, wherein the volume expansion coefficient α of the filling liquid (4) is not less than 0.0002, unit: 1/° C, and the compression coefficient β is not less than 4.5 × 10-4The unit: 1/MPa.
3. The mandrel of claim 1, wherein the mandrel is used for electroforming thin-walled seamless metal round tubes, and the mandrel is characterized in that: the upper plug (2) and the lower plug (3) are made of acid and alkali corrosion resistant metal.
4. The mandrel of claim 1, wherein the mandrel is used for electroforming thin-walled seamless metal round tubes, and the mandrel is characterized in that: the electricity-leading column (5) is fixed on the upper plug (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921981479.6U CN210945820U (en) | 2019-11-18 | 2019-11-18 | Core mould for electroforming to prepare thin-wall seamless metal round pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921981479.6U CN210945820U (en) | 2019-11-18 | 2019-11-18 | Core mould for electroforming to prepare thin-wall seamless metal round pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210945820U true CN210945820U (en) | 2020-07-07 |
Family
ID=71386810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921981479.6U Expired - Fee Related CN210945820U (en) | 2019-11-18 | 2019-11-18 | Core mould for electroforming to prepare thin-wall seamless metal round pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210945820U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777399A (en) * | 2019-11-18 | 2020-02-11 | 河南理工大学 | Core mould for electroforming to prepare thin-wall seamless metal round pipe |
-
2019
- 2019-11-18 CN CN201921981479.6U patent/CN210945820U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777399A (en) * | 2019-11-18 | 2020-02-11 | 河南理工大学 | Core mould for electroforming to prepare thin-wall seamless metal round pipe |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200707 |