阅读说明：本技术 一种用于电铸制备薄壁无缝金属圆管的芯模 (Core mould for electroforming to prepare thin-wall seamless metal round pipe ) 是由 明平美 王日鑫 闫亮 赵小康 于 2019-11-18 设计创作，主要内容包括：本发明专利公开了一种用于电铸制备薄壁无缝金属圆管的芯模,属于电化学加工技术领域。该芯模包括金属圆管、设于金属圆管一端的加压单元、设于金属圆管另一端的引电堵头、液压油；加压单元包括加压堵头、加压螺杆、泄压螺钉、单向阀、筒状保护套。本发明将脱模机构设于芯模内部,使得脱模功能(机构)与电铸芯模集成于一体,结构紧凑,空间利用率高。且本发明仅需通过对加压螺杆与泄压螺钉进行简单旋转,即可实现芯模在电铸时弹性胀大,脱模时弹性收缩,进而在芯模与电铸层之间获得了足够大的脱模间隙,使得脱模容易。(The invention discloses a mandrel for manufacturing a thin-wall seamless metal round pipe through electroforming, and belongs to the technical field of electrochemical machining. The core mold comprises a metal round pipe, a pressurizing unit arranged at one end of the metal round pipe, an electricity-leading plug arranged at the other end of the metal round pipe and hydraulic oil; the pressurizing unit comprises a pressurizing plug, a pressurizing screw rod, a pressure relief screw, a one-way valve and a cylindrical protective sleeve. The invention arranges the demoulding mechanism in the core mould, so that the demoulding function (mechanism) and the electroforming core mould are integrated into a whole, the structure is compact, and the space utilization rate is high. In addition, the invention can realize the elastic expansion of the core mould during electroforming and the elastic contraction during demoulding only by simply rotating the pressurizing screw rod and the pressure relief screw, thereby obtaining a large enough demoulding gap between the core mould and the electroforming layer and ensuring easy demoulding.)

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), a pressurizing unit (2) arranged at one end of the metal round pipe (1), an electricity-leading plug (3) arranged at the other end of the metal round pipe (1), and hydraulic oil (4); the pressurizing unit (2) comprises a pressurizing plug (2-1), a pressurizing screw (2-2), a pressure relief screw (2-3), a one-way valve (2-4) and a cylindrical protective sleeve (2-5); the pressurizing plug (2-1) is cylindrical, and a front threaded section (2-1-1), a middle unthreaded hole (2-1-2) and a rear mounting hole (2-1-3) are sequentially arranged in the pressurizing plug along the same central axis; a T-shaped communicating groove (2-1-4) is arranged in the wall body of the pressurizing plug (2-1); 3 outlets of the T-shaped communication groove (2-1-4) are respectively arranged at the rear end face, the outer cylindrical surface and the middle light hole (2-1-2) of the pressurizing plug (2-1); the pressurizing plug (2-1) is fixedly connected with the end part of the metal round pipe (1) in a sealing way; the pressurizing screw rod (2-2) is in a round rod shape, and the middle part and the front end part of the pressurizing screw rod are respectively provided with an external thread (2-2-1) and a smooth cylindrical boss (2-2-2); the pressurizing screw rod (2-2) is movably arranged in the pressurizing plug (2-1) in a matching way through the external thread (2-2-1) and the smooth cylindrical boss (2-2-2); the one-way valve (2-4) is fixedly connected with the rear mounting hole (2-1-3) in a sealing way; the pressure relief screw (2-3) is rotatably and hermetically connected into an outlet of the T-shaped communication groove (2-1-4) on the outer cylindrical surface of the pressurizing plug (2-1); the electricity leading plug (3) is fixedly connected with the other end of the metal round pipe (1) in a sealing way; the hydraulic oil (4) fills the middle light hole (2-1-2) and a cavity (5) formed by the pressurizing plug (2-1), the metal round tube (1) and the electricity-leading plug (3) without gaps and bubbles.

2. 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: and the electricity leading plug (3) is provided with an electricity leading column (3-1).

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 electricity leading plug (3) is a metal product resistant to acid and alkali corrosion.

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 cylindrical protective sleeve (2-5) is detachably connected to the outer cylindrical surface of the pressurizing plug (2-1) in a sealing fit mode.

5. 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 cylindrical protective sleeve (2-5) is an acid and alkali corrosion resistant electric insulation nonmetal product.

Technical Field

The invention relates to the technical field of electrochemical machining, in particular to a mandrel for manufacturing a thin-wall seamless metal round pipe through electroforming.

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 invention aims to provide a mandrel for manufacturing a thin-wall seamless metal round pipe by electroforming so as to solve the problems mentioned above.

In order to achieve the purpose, the technical scheme of the invention is as follows: a mandrel for manufacturing a thin-wall seamless metal round tube by electroforming comprises a metal round tube, a pressurizing unit arranged at one end of the metal round tube, an electricity-leading plug arranged at the other end of the metal round tube and hydraulic oil; the pressurizing unit comprises a pressurizing plug, a pressurizing screw, a pressure relief screw, a one-way valve and a cylindrical protective sleeve; the pressurizing plug is cylindrical, and a front threaded section, a middle unthreaded hole and a rear mounting hole are sequentially arranged in the pressurizing plug along the same central axis; a T-shaped communicating groove is formed in the wall body of the pressurizing plug; 3 outlets of the T-shaped communication groove are respectively arranged at the rear end face, the outer cylindrical surface and the middle light hole of the pressurizing plug; the pressurizing plug is fixedly connected with the end part of the metal round pipe in a sealing way; the pressurizing screw rod is in a round rod shape, and the middle part and the front end part of the pressurizing screw rod are respectively provided with an external thread and a smooth cylindrical boss; the pressurizing screw rod is movably arranged in the pressurizing plug in a matching way through the external thread and the smooth cylindrical boss; the one-way valve is fixedly connected with the rear mounting hole in a sealing way; the pressure relief screw is rotatably and hermetically connected into an outlet of the T-shaped communication groove, which is positioned on the outer cylindrical surface of the pressurizing plug; the electricity leading plug is fixedly connected with the other end of the metal round pipe in a sealing way; the hydraulic oil is filled in the middle light hole and a cavity formed by the pressurizing plug, the metal round tube and the electricity leading plug without gaps and bubbles.

And the electricity leading plug is provided with an electricity leading column.

The electricity leading plug is a metal product resistant to acid and alkali corrosion.

The cylindrical protective sleeve is detachably connected to the outer cylindrical surface of the pressurizing plug in a sealing fit mode.

The cylindrical protective sleeve is an acid and alkali corrosion resistant electric insulation nonmetal product.

The invention has the beneficial effects that:

1. compact structure and high space utilization rate. The invention arranges the demoulding mechanism in the core mould, so that the demoulding function (mechanism) and the electroforming core mould are integrated into a whole, no additional independent auxiliary demoulding equipment or mechanism is needed, the structure is compact, and the space utilization rate is high.

2. Easy operation and good demoulding effect. Compared with a demolding method for jetting high-pressure liquid/gas and the like between a core mold and an electroforming layer by means of auxiliary equipment, the demolding method disclosed by the invention has the advantages that the complicated operation steps are not needed, the elastic expansion of the core mold during electroforming and the elastic contraction of the core mold during demolding can be realized only by simply rotating the pressurizing screw rod and the pressure relief screw, and further a large enough demolding gap is obtained between the core mold and the electroforming layer, so that the demolding is easy.

3. The process cost is low, and the practicability is strong. The demoulding method does not depend on expensive auxiliary equipment, the expansion amount of the demoulding agent is in the elastic deformation of the core mould, and the core mould can be repeatedly used for a long time, so that the demoulding method is suitable for mass production and has low cost.

Drawings

Fig. 1 is an overall view of the present invention.

Fig. 2 is a schematic cross-sectional view of a pressurizing unit of the present invention.

Fig. 3 is a schematic cross-sectional view of the plug end for introducing electricity according to the present invention.

Fig. 4 is a schematic illustration of the demolding principle of the present invention.

Reference numbers and designations in the drawings: 1. a metal round tube; 2. a pressurizing unit; 2-1, pressurizing a plug; 2-1-1, front thread section; 2-1-2, a middle unthreaded hole; 2-1-3, rear mounting holes; 2-1-4 and a T-shaped communicating groove; 2-2, a pressurizing screw rod; 2-2-1, external threads; 2-2-2, smooth cylindrical bosses; 2-3, a pressure relief screw; 2-4, a one-way valve; 2-5, a cylindrical protective sleeve; 3. a plug for leading electricity; 3-1, leading an electric pole; 4. hydraulic oil; 5. a cavity; 6. an electroformed layer.

Detailed Description

The following further describes the practice of the present invention in conjunction with the accompanying drawings.

As shown in figure 1 ~ 3, the core mould for electroforming thin-wall seamless metal round tubes comprises a metal round tube 1, a pressurizing unit 2 arranged at one end of the metal round tube 1, an electricity-leading plug 3 arranged at the other end of the metal round tube 1 and hydraulic oil 4, wherein the pressurizing unit 2 comprises a pressurizing plug 2-1, a pressurizing screw rod 2-2, a pressure-releasing screw 2-3, a one-way valve 2-4 and a cylindrical protective sleeve 2-5, the outer diameter D =30mm, the inner diameter D =28mm and the length L =350mm of the metal round tube 1 are made of 304 stainless steel, the pressurizing plug 2-1 is cylindrical, a front thread section 2-1-1, a middle light hole 2-1-2 and a rear mounting hole 2-1-3 are sequentially arranged in the inner part and the central axis of the pressurizing plug 2-1-2, a T-shaped communicating groove 2-1-4 is arranged in the wall of the pressurizing plug 2-1, 3 smooth surfaces of the T-shaped communicating groove 2-1-4 are respectively arranged on the rear end surface of the pressurizing plug 2-1, the pressurizing plug 2-1 and the middle light hole 2-2, a pressurizing plug 2-1-2-2-2-1 smooth surface is connected with a pressurizing plug 2-2-sealing connection hole, a pressurizing plug 2-2-2-sealing connection, a pressurizing plug is arranged in a pressurizing plug, a gap is connected with a pressurizing plug 2-2-sealing connection, a pressurizing plug is rotatably connected with a pressurizing plug, a pressurizing plug 2-2-2.

The electricity leading plug 3 is provided with an electricity leading column 3-1.

The electricity leading plug 3 is made of SUS304 stainless steel.

The cylindrical protective sleeve 2-5 is detachably coupled in sealing fit with the outer cylindrical surface of the pressurizing plug 2-1.

The cylindrical protective sleeve 2-5 is made of polypropylene.

The working principle of the invention is as follows.

The hydraulic oil pressure in the cavity 5 when the circular metal tube 1 in the core mold starts to be plastically deformed is calculated to be=14.13Mpa（

) Therefore, when the hydraulic oil pressure P in the cavity 5 is not more than 14.13MPa, the core mold is elastically deformed.

Before electroforming, the pressurizing screw rod 2-2 is rotated, hydraulic oil in the middle unthreaded hole 2-1-2 is squeezed into the cavity 5 through the one-way valve 2-4, and the pressure of the hydraulic oil in the cavity 5 is increased to P =12 Mpa. The outer diameter of the core die under the pressure is elastically expanded by delta D (about 25.66 mu m) ((

). This mandrel was placed in an electroforming tank as a cathode to perform electroforming, and when the electroforming layer 6 reached a desired thickness, electroforming was stopped and the mandrel with the electroforming layer 6 was taken out from the electroforming tank (a sectional view is shown in fig. 4 (a)).

When demoulding, the pressure relief screw 2-3 is screwed outwards, so that the cavity 5 and the middle unthreaded hole 2-1-2 are communicated through the T-shaped communicating groove 2-1-4. And (3) reversely rotating the pressurizing screw rod 2-2, and allowing partial hydraulic oil in the cavity 5 to flow back to the middle unthreaded hole 2-1-2 through the T-shaped communicating groove 2-1-4, so that the hydraulic oil pressure in the core mold cavity 5 is reduced to 0Mpa from P =12Mpa, and the outer diameter of the core mold is contracted to return to the original size. At this time, a mold release gap (shown in fig. 4 (b)) of Δ H = Δ D ≈ 25.66 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.

σ s: yield strength of the material of the round metal tube 1, E: elastic modulus of the material of the metal round tube 1, γ: poisson coefficient of the metal round tube 1 material, D: outer diameter of the round metal pipe 1, d: inner diameter of the round metal pipe 1, P: the hydraulic oil pressure in the cavity 5.