Cathode shielding protection device

Abstract

The utility model discloses a cathode shielding protection device, which belongs to the technical field of devices for electroforming, and comprises a shell, a first accommodating cavity is arranged in the shell, a part for electroforming in a core mold is arranged in the first accommodating cavity, and the part and the first accommodating cavity are arranged at an interval to form an electroforming cavity for accommodating liquid for electroforming; the shell is provided with a through hole used for enhancing the intensity of an electric field and an insulation shielding part used for weakening the intensity of the electric field, the through hole is located in the position opposite to the concave face of the core mold, and the insulation shielding part is located in the position opposite to the ridge, the sharp corner and the torsional corner of the core mold; by arranging the through hole and the insulation shielding part on the shell, the electric field intensity of each part of the core mold tends to be uniformly distributed, so that the consistency of the thickness of each part of a product is improved, bath solution pollution is avoided, the consumption of an anode material is not increased, the production cost can be reduced, and experience is accumulated for subsequent production of similar parts; and further development of the electroforming industry is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of devices for electroforming, in particular to a cathode shielding protection device. Background Art

[0002] The aerodynamic performance requirements for the shape of aircraft propeller blades are extremely high. Since the leading edge shroud is adhesively bonded to the blade, high requirements are imposed on the dimensional accuracy, thickness, and weight tolerance of this part. The production process of the leading edge shroud is electroforming, that is, a stainless steel core mold is used as the cathode, and the metal for electroforming is used as the anode. In the bath solution, a metal layer is deposited on the surface of the core mold through an electrochemical reaction. After demolding, a metal part with a high replication accuracy of the inner cavity can be obtained.

[0003] Due to the complex shape of the leading edge shroud, with a cross-section approximately in a "U" shape and having sharp corners, twist angles, and curved concave surfaces, due to the "current tip effect", the charge density at the back, sharp corners, and twist angles of the obtained metal part is relatively large, the electric field lines are dense, and the electric field strength is high, resulting in a relatively thick electroformed layer at this part during actual production; while the concave surface is far from the anode, the electric field lines are sparse, and the thickness is relatively thin, resulting in uneven overall thickness of the product, which in turn affects the aerodynamic performance of the blade.

[0004] The traditional method for improving the distribution of power lines is to hang a set of pictorial iron wires on the outer surface of the electroforming core mold. The shape of the pictorial iron wires matches the outer contour of the electroforming core mold, and the size is slightly larger than the outer contour of the electroforming core mold. The distribution of electric field lines is optimized by hanging the pictorial iron wires. However, this method will cause an increase in the iron ion content in the bath solution, affecting the performance of the bath solution; in addition, since it is difficult to ensure that the pictorial iron wires are completely consistent with the shape of the electroforming core mold, the effect of absorbing electric field lines is limited; moreover, to remove the hydrogen bubbles adsorbed on the core mold due to the electrochemical reaction, the electroforming core mold needs to continuously reciprocate in the bath solution along the copper bar. After a long time of movement, the pictorial iron wires are likely to be deformed, affecting the optimization of the uniformity of the electric field line distribution; furthermore, the weight of the metal layer deposited on the iron wires is generally heavier than the product itself, which causes waste of anode materials and increases the production cost.

[0005] Therefore, there is an urgent need to seek a cathode shielding protection device to make the electric field strength at each part of the core mold tend to be evenly distributed, improve the consistency of the product thickness, and also not pollute the bath solution, not increase the consumption of anode materials, and reduce the production cost. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a cathode shielding protection device for the defects and deficiencies in the prior art. By setting through holes and insulating shielding components on the housing, the electric field strength at each part of the core mold is optimized, so that the thickness of the product formed after electroforming tends to be consistent. Moreover, this method will not cause bath solution pollution, does not increase the consumption of anode materials, and reduces the production cost.

[0007] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0008] The utility model provides a cathode shielding protection device, including a housing. A first accommodation cavity is provided inside the housing. The part of the mandrel for electroforming is placed in the first accommodation cavity and is spaced from the first accommodation cavity to form an electroforming cavity for accommodating electroforming liquid.

[0009] The housing is provided with through holes for enhancing the electric field strength and insulating shielding components for weakening the electric field strength. The through holes are located at positions opposite to the concave surface of the mandrel, and the insulating shielding components are located at positions opposite to the spine, sharp corners, and twist angles of the mandrel.

[0010] Preferably, the housing is provided with through holes of different sizes, and the cross-sectional area of the through holes is not less than the maximum cross-sectional area of the concave surface corresponding to the through holes.

[0011] Preferably, the cross-sectional area of the insulating shielding component is not less than the maximum cross-sectional area of the spine, sharp corners, and twist angles it shields.

[0012] Preferably, the insulating shielding component is an insulating protrusion made of the same material as the housing.

[0013] Preferably, the housing is a plastic housing made of insulating material.

[0014] Preferably, the cathode shielding protection device further includes an insulating protection device. A second accommodation cavity for accommodating the non-electroforming part of the mandrel is provided inside the insulating protection device. The second accommodation cavity has an inlet and outlet for the non-electroforming part of the mandrel to pass through, and a sealing component for eliminating gaps is provided at the part where the inlet and outlet are in contact with the mandrel.

[0015] Preferably, the insulating protection device is provided with an annular groove, which is arranged around the edge of the inlet and outlet, and the cross-sectional area of the groove is adapted to the cross-sectional area of the sealing component.

[0016] Preferably, the insulating protection device includes a first outer shell and a second outer shell. A cavity is provided inside the first outer shell and / or the second outer shell. The cavity inside the first outer shell, or the cavity inside the second outer shell, or the cavities inside the first outer shell and the second outer shell together form the second accommodation cavity.

[0017] Preferably, the mandrel, the insulating protection device, and the housing are fixedly connected to form an overall shielding device, and the overall shielding device is connected to the electroforming tank through a conductive connecting piece.

[0018] Preferably, it includes two or more groups of the overall shielding devices and the connecting pieces with the same number as that of the overall shielding devices. The lengths of different connecting pieces are different, and the overall shielding device connected to the long connecting piece is placed below the overall shielding device connected to the short connecting piece.

[0019] The utility model has achieved the following technical effects compared with the prior art:

[0020] 1. By arranging through holes at positions opposite to the concave surface of the core mold and insulating shielding components at positions opposite to the spine, sharp corners and twist angles of the core mold, the metal deposition thickness at the concave surface is increased, and the metal deposition thickness at the spine, sharp corners and twist angles is reduced, so that the thickness of the manufactured metal parts is uniform, and the thickness tolerance can be controlled within ±0.02 mm. The product quality, production stability and consistency are improved, the aerodynamic shape of the propeller blade is ensured, and the production efficiency is increased by about 20% at the same time. It will not cause an increase in the consumption of anode materials, reduces the production and manufacturing costs, and saves energy, materials, labor and other expenses. In addition, it also accumulates experience for the production of subsequent similar parts, lays a solid technical foundation, and provides technical guarantee for the large-scale application of domestic composite material blades and other products.

[0021] Other technical solutions of the utility model have achieved the following technical effects compared with the prior art:

[0022] 2. By arranging connecting pieces with different lengths and placing the overall shielding device connected to the long connecting piece below the overall shielding device connected to the short connecting piece, two or more electroforming products can be manufactured at one time, improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic assembly structure diagram of the housing and the first outer shell in some embodiments;

[0025] Figure 2 It is a schematic top view structure diagram of the overall shielding device in some embodiments;

[0026] Figure 3 It is a schematic cross-sectional structure diagram at A-A;

[0027] Figure 4 It is a schematic structure diagram of the housing in some embodiments

[0028] Figure 5 is a schematic structural diagram of a second outer shell in some embodiments;

[0029] Figure 6 is a schematic structural diagram of a short connecting piece in some embodiments;

[0030] Figure 7 is a schematic structural diagram of a long connecting piece in some embodiments;

[0031] Figure 8 is a schematic structural diagram of a positioning pin in some embodiments;

[0032] Figures 9 to 10 is a schematic assembly structural diagram of two overall shielding devices in some embodiments.

[0033] Wherein, 100, housing; 110, first accommodating cavity; 111, electroforming cavity; 120, through hole; 130, insulating shielding component; 140, threaded hole; 150, positioning pin; 200, core mold; 300, insulating protection device; 310, second accommodating cavity; 320, sealing component; 330, first outer shell; 331, first cavity; 332, first mounting hole; 333, groove; 340, second outer shell; 341, second cavity; 400, connecting piece; 410, stainless steel screw. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0036] Such as Figures 1 to 10As shown in the figure, the present utility model provides a cathode shielding protection device, which includes a housing 100. A first accommodation cavity 110 is provided inside the housing 100. The electroforming part of the mandrel 200 is placed inside the first accommodation cavity 110 and is spaced from the first accommodation cavity 110 to form an electroforming cavity 111 for accommodating electroforming liquid. The housing 100 is provided with a through hole 120 for enhancing the electric field strength and an insulating shielding component 130 for weakening the electric field strength. The through hole 120 is located at a position opposite to the concave surface of the mandrel 200, and the insulating shielding component 130 is located at positions opposite to the ridge, sharp corner and twist angle of the mandrel 200. In this application, by opening the through hole 120 at a position opposite to the concave surface of the mandrel 200, the distance between the mandrel 200 and the field source charge is shortened, enabling the electric field lines to directly contact the concave surface part of the mandrel 200, thereby enhancing the electric field strength at the concave surface, enhancing the degree of electrochemical reaction at the concave surface, and further increasing the metal deposition thickness at the concave surface. In addition, since the insulating component can block some electric field lines, an insulating shielding component 130 is provided at a position opposite to the ridge, sharp corner and twist angle of the mandrel 200 to reduce the electric field strength at these positions, reduce the degree of electrochemical reaction at these positions, and thus reduce the metal deposition thickness at these positions. That is to say, in this application, by increasing the metal deposition thickness at the concave surface and reducing the metal deposition thickness at the ridge, sharp corner and twist angle, the thickness of the product formed by electroforming tends to be uniform and consistent, thereby improving the electroforming quality. In addition, this method will not pollute the bath solution and will not cause excessive use of anode materials, thus reducing production costs. Moreover, the design of the through hole 120 can also enable the bath solution to flow smoothly between the cathode shielding protection device and the electroforming bath, reducing the resistance suffered by the device formed by assembling the cathode shielding protection device and the mandrel 200 during continuous movement, making the device not easily deformed, and finally obtaining a metal workpiece with better thickness consistency.

[0037] According to the distribution of the electric field lines, through holes 120 of different sizes are opened on the housing 100, and the cross-sectional area of the through hole 120 is not less than the maximum cross-sectional area of the corresponding concave surface, so as to increase the overall metal deposition thickness at the concave surface. In some embodiments, long-strip through holes are processed at most of the concave places on the surface of the metal workpiece, and hole-shaped through holes are processed at the locally concave places. In order to improve the shielding effect on the ridge, sharp corner and twist angle, the cross-sectional area of the insulating shielding component 130 is not less than the maximum cross-sectional area of the ridge, sharp corner and twist angle it shields.

[0038] The insulating shielding component 130 can be a plate-like or sheath-like insulating component independent of the housing 100. The insulating component and the housing 100 are separately molded and then assembled into an integral structure. Alternatively, the entire housing 100 can be made into an insulating component, such that the insulating shielding component 130 is one or more parts of the housing 100. In some embodiments, the insulating shielding component 130 is an insulating protrusion made of the same material as the housing 100, and the size and shape of the insulating protrusions corresponding to different parts such as the ridge, sharp corner, and torsion angle can be adjusted according to the actual situation. The material of the housing 100 can be a plastic, rubber with insulating properties, or a metal part coated with insulating paint. In some embodiments, the housing 100 is made of a plastic material with insulating properties, such as polyvinyl chloride.

[0039] The parts of the mandrel 200 that do not need electroforming need to be insulated and protected during use. The method of insulation protection can be brushing chemical milling glue. However, since the coated chemical milling glue will be damaged, the damaged chemical milling glue will lose its protective effect on the mandrel 200. In order to prevent nodulation from occurring on the non-electroforming parts of the mandrel 200, the damaged parts need to be frequently brushed with glue for repair during use, thus prolonging the production cycle. To solve this problem, the cathode shielding protection device provided by the present utility model further includes an insulation protection device 300. The interior of the insulation protection device 300 is provided with a second accommodation cavity 310 for accommodating the non-electroforming parts of the mandrel 200. The second accommodation cavity 310 has an inlet and outlet for the non-electroforming parts of the mandrel 200 to pass through, and a sealing component 320 for eliminating gaps is provided at the inlet and outlet. By sealing the non-electroforming parts of the mandrel 200 inside the insulation protection device 300, insulation protection for the non-electroforming parts of the mandrel 200 is achieved.

[0040] If the insulation protection device 300 is of an integral structure, the inlet and outlet are located at the end of the insulation protection device 300 close to the housing 100. To facilitate processing and manufacturing and the installation of the non-electroforming part of the core mold 200, in some embodiments, the insulation protection device 300 includes a first outer shell 330 and a second outer shell 340 that are detachably connected. A cavity with one end open is provided inside the first outer shell 330 and / or the second outer shell 340. The cavity inside the first outer shell 330, or the cavity inside the second outer shell 340, or the cavities inside the first outer shell 330 and the second outer shell 340 constitute the second accommodation cavity 310. In some embodiments, a first cavity 331 is provided inside the first outer shell 330, and a second cavity 341 is provided inside the second outer shell 340. During use, the first outer shell 330 is covered on the second outer shell 340 so that the first cavity 331 and the second cavity 341 are connected to form the second accommodation cavity 310. At this time, the inlet and outlet are the openings of the first cavity 331 or the second cavity 341. The detachable connection method between the first outer shell 330 and the second outer shell 340 can be snap connection, threaded connection, pin connection, mortise and tenon structure connection, etc. In some embodiments, at least two first mounting holes 332 are provided on the first outer shell 330 and the second outer shell 340, and pins pass through the first mounting holes 332 on the first outer shell 330 and the second outer shell 340 to achieve fixed connection between the two. In some embodiments, the first outer shell 330 and the second outer shell 340 are symmetrically arranged to reduce the processing and manufacturing difficulty.

[0041] The sealing member 320 can be structures such as a sealing ring, a sealing strip, a rubber lip for sealing, etc. In some embodiments, the sealing member 320 is a sealing strip. If the sealing strip is directly placed between the non-electroforming part of the core mold 200 and the inlet and outlet, the placement position of the sealing strip is likely to shift. To solve this problem, in some embodiments, a groove 333 adapted to the thickness of the sealing strip is provided at the inlet and outlet. During use, the sealing strip is placed in the groove 333. In some embodiments, a circular groove 333 is provided around the inlet and outlet to improve the sealing between the inlet and outlet and the core mold 200. The sealing strip can be a rubber sealing strip, a polyurethane sealing strip, etc. In some embodiments, the sealing strip is a rubber sealing strip.

[0042] To facilitate the movement of the cathode shielding protection device and the core mold 200 during electroforming, the core mold 200, the insulation protection device 300, and the housing 100 are fixedly connected to form an integral shielding device, and the integral shielding device is connected to the electroforming tank through a conductive connecting member 400. In some embodiments, threaded holes 140 are provided at both ends of the core mold 200, the insulation protection device 300, and the housing 100. The positioning pins 150 pass through the threaded holes 140 on the housing 100, the insulation protection device 300, and the core mold 200 in sequence to fix the three.

[0043] The connecting member 400 may be a rod-shaped, strip-shaped or belt-shaped member with a hook or a ring at one end. One end of the connecting member 400 is connected to the integral shielding device, and the other end is hung or sleeved on the cathode bar erected on the electroforming tank through the hook or the ring. And the connecting member 400 is in contact with the core mold 200 so that an electro-chemical reaction can occur at the core mold 200. In some embodiments, the connecting member 400 is a copper hook, and the copper hook is fixed to the insulating protection device 300 by stainless steel screws 410, and the stainless steel screws 410 are in direct contact with the core mold 200 to achieve conductive contact.

[0044] During electroforming, a set of integral shielding devices can be placed in the electroforming tank for electroforming, or two or more sets of integral shielding devices can be placed in the electroforming tank for electroforming to improve the electroforming efficiency. In some embodiments, there are two or more sets of integral shielding devices and connecting members 400 with the same number as the integral shielding devices. The lengths of different connecting members 400 are different. The connecting member 400 with a longer length is not only longer in the vertical direction than the connecting member 400 with a shorter length, but also longer in the width direction than the connecting member 400 with a shorter length, so that the integral shielding device connected to the long connecting member 400 can be placed below the integral shielding device connected to the short connecting member 400.

[0045] In use, first install the insulating protection device 300 on the non-electroforming part of the core mold 200, and check whether the seal between the insulating protection device 300 and the core mold 200 is good. If there is a poor sealing situation, readjust and then reassemble the insulating protection device 300 and the core mold 200; then sleeved the housing 100 on the electroforming part of the core mold 200, and fixedly connect the core mold 200, the insulating protection device 300 and the core mold 200 to form an integral shielding device. Finally, hang or sleeve the assembled components on the cathode bar in the order of the length of the connecting member 400 from short to long or from long to short. After all are hung or sleeved, the power supply can be connected to start electroforming. This cathode shielding protection device can be used not only for the electroforming process but also for the electroplating process. This application applies this cathode shielding protection device to the production process of adhesively bonding the leading edge shroud on the aircraft propeller blade.

[0046] It should be noted that for those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model, and any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A cathode shielding protection device, characterized in that: It includes a housing, inside which there is a first accommodating cavity. The part of the mandrel for electroforming is placed in the first accommodating cavity and is spaced from the first accommodating cavity to form an electroforming cavity for accommodating electroforming liquid. The housing is provided with through holes for enhancing the electric field strength and insulating shielding components for weakening the electric field strength. The through holes are located at positions opposite to the concave surface of the mandrel, and the insulating shielding components are located at positions opposite to the ridge, sharp corners, and twist angles of the mandrel.

2. The cathode shielding protection device according to claim 1, characterized in that: The housing is provided with through holes of different sizes, and the cross-sectional area of the through holes is not less than the maximum cross-sectional area of the concave surface corresponding to the through holes.

3. The cathode shielding protection device according to claim 2, wherein: The cross-sectional area of the insulating shielding component is not less than the maximum cross-sectional area of the ridge, sharp corners, and twist angles it shields.

4. The cathode shielding protection device according to claim 3, characterized in that: The insulating shielding component is an insulating protrusion made of the same material as the housing.

5. The cathode shielding protection device according to claim 4, characterized in that: The housing is a plastic housing made of insulating material.

6. The cathode shielding protection device according to any one of claims 1 to 5, characterized in that: The cathode shielding protection device further includes an insulating protection device. Inside the insulating protection device, there is a second accommodating cavity for accommodating the non-electroforming part of the mandrel. The second accommodating cavity has an inlet and outlet for the non-electroforming part of the mandrel to pass through, and a sealing component for eliminating gaps is provided at the part where the inlet and outlet contact the mandrel.

7. The cathode shielding protection device according to claim 6, wherein: The insulating protection device is provided with an annular groove, which is arranged around the edge of the inlet and outlet. The cross-sectional area of the groove is adapted to the cross-sectional area of the sealing component.

8. The cathode shielding protection device according to claim 7, wherein: The insulating protection device includes a first outer shell and a second outer shell. There is a cavity inside the first outer shell and / or the second outer shell. The cavity inside the first outer shell, or the cavity inside the second outer shell, or the cavities inside the first outer shell and the second outer shell together constitute the second accommodating cavity.

9. The cathode shielding protection device according to claim 8, characterized in that: The mandrel, the insulating protection device, and the housing are fixedly connected to form an overall shielding device, and the overall shielding device is connected to the electroforming tank through a conductive connecting piece.

10. The cathode shielding protection device according to claim 9, characterized in that: It includes two or more groups of the overall shielding devices and connecting pieces with the same number as the overall shielding devices. The lengths of different connecting pieces are different, and the overall shielding device connected to the long connecting piece is placed below the overall shielding device connected to the short connecting piece.

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