JPS5916991A - Electrotyping apparatus and preparation of shell therefor - Google Patents

Abstract

PURPOSE:To prepare an electrotyping shell reduced in the precipitation of dendrite in good efficiency within a short time, by a method wherein an electro-forming matrix mold is rotated and vibrated in an electro-forming liquid containing a particle having mechanical grinding capacity while repeatedly reciprocated with respect to the current passing orifices of a partition wall and an electro-forming current is flowed. CONSTITUTION:An electro-forming tank 2 is divided into an electro-forming chamber and an electrode chamber by a partition wall 3 having current passing orifices 3a at a desired height in the axial direction thereof. An electro-forming matrix mold 8 is inserted and immersed into the electro-forming chamber while a current passing electrode 4 and an electro-forming metal 5 are inserted into the electrode chamber. A known electro-forming liquid 6 is introduced into said tank 2 and plural semiconductive or non-conductive particles 7 each of which has mechanical grinding capacity are mixed in said liquid 6. In this state, the surface of the matrix mold 8 is subjected to zone plating or scanning by high density current beams flowed out of the orifices 3a generated by the up-and-down motion of said matrix mold 8 passing said orifices 3a. At the same time, the matrix mold 8 is rotated or vibrated and the electro-forming surface is subjected to liquid honing or barrel polishing by particles 7.

Description

[Detailed Description of the Invention] The present invention provides a highly efficient and novel electric Lj! Regarding the shell manufacturing method and the electroforming equipment used in carrying out the method, more specifically, for example, an electroforming shell of about 5 mm thickness of +N can be produced within several hours to several tens of hours, and within about 24 hours at most. The present invention relates to a high-speed electroforming device and an electroforming method that can perform casting.

When attempting to manufacture an electroformed shell with a thickness of about 0.5 to 5 mm using conventionally known electroforming equipment, dendrites or lateral crystals of the electroformed metal may grow on the electroformed surface, or extremely sharp irregularities may occur. There was a problem that this may occur.

In order to prevent these disturbances as much as possible, the current density must be limited to very low levels, so that −
71t/day? The thickness is limited to about 0.5 to 1 mm, and in order to perform Mi casting of about several mm, it is necessary to apply electricity for several days or more in total.

However, even if electroforming is performed at such a low current density, these failures cannot be completely prevented, and therefore, the electroforming operation is often stopped and the electroformed product is taken out of the electroforming solution (RRI casting bath). As is or with the electroforming equipment? l! The entire cast mold is removed, transferred to a cutting device, etc., and installed, and these crystals and irregularities are removed and smoothed by cutting or grinding, and then removed from the cutting device, etc., and cleaned, degreased, and surface activated. After processing, washing with water, etc., it was necessary to repeat the process of returning to the electroforming solution or to the electroforming device and restarting electroforming.

This type of work is not only complicated, but also difficult to predict, so periodic monitoring and unscheduled work by skilled personnel is essential, but there are limits to this, so in the end, In addition to unavoidable long idle time, which is uneconomical, continuous unmanned electroforming late at night is also impossible.

In addition, with conventional methods, there is a lot of waste in electroformed metal and electricity, and there is also a serious problem of increased costs due to chemical costs, etc. Waste liquid treatment is also a big problem, but the cutting or grinding methods mentioned above are The increase in waste liquids such as chemicals generated during the machining process has become an even more serious problem.

However, if the above-mentioned treatments such as degreasing, reactivation treatment, washing with water, etc. of the machined surface are incomplete, a defective layer is generated in the electroformed shell, which causes peeling.

However, when increasing the current density and increasing the speed of electroforming in conventional electroforming equipment, sharp irregularities and dendrite precipitation in the deposited electroformed metal increase in size, and the above-mentioned machines The process had to be repeated more frequently, and in the end, the length required more time, manpower, materials, and electricity to manufacture, and the quality of the product was also lowered.

The present invention has been developed from the perspective of upward slope, and its purpose is to perform high-speed electroforming at high current density.
ζ Also, the precipitation of dendrites and the occurrence of unevenness are extremely small (therefore, the object is to propose a new method and apparatus that can efficiently produce electroformed shells in a short time).

C1 The gist of the present invention is to apply a process similar to liquid honing or barrel polishing to the electroformed surface in an electroforming bath, and to locally increase the height of the surface by a method called fuzone plating. By repeatedly applying electricity at a current density, the precipitation of dendrites and the occurrence of unevenness in electroformed products can be suppressed, and electroforming can be performed at high speed.

Hereinafter, the details of the present invention will be explained with reference to the drawings. lY: Phase will be specifically explained.

The drawing is a sectional view, not showing an embodiment of the electroforming device according to the present invention, where ■ is a machine base supporting the device, 2 is an electroforming tank, and 3 is an electroforming tank located approximately in the center and extending all around the entire circumference. A cylindrical non-conductive partition wall provided with current-carrying holes 3a, 3a, 4 a through 1'cim pole, 5 a block of electroformed metal filled between the partition wall 3 and the current-carrying electrode 40, and 6 a known electrical & I liquid. , 7.7 are particles with grinding ability, for example, depths or particles of alumina oxide, etc. 8 is usually tapered in a predetermined axial direction, and preferably has a mirror finish in advance so that the electroformed shell can be peeled off. Is there a known material that has a thin oxide film if necessary? 'li# mother mold, 9 is the electrode which is being deposited on the electroforming mother mold 8, 10 is an auxiliary cathode, 11 is a hydraulic cylinder that supports the auxiliary cathode 10 and allows it to move appropriately; is an encoder, 13 is a power supply for electroforming,
14 is a switch; 15 is a switch for imparting reciprocating motion of the tU shape to the electroforming mother mold 8 in the direction of the tapered axis, and further imparting rotation around the axis and/or vibration of minute amplitude in the direction of the reciprocating motion; It is a supporting device that supports.

This support device 15 includes a hydraulic cylinder 16, piston four throats 17, an encoder 18, an encoder 19, a head 20, a spindle 21, a motor 22, a slider pull coupling 23, springs 24 and 25, and a spring adjustment screw 26. , an excitation coil 27, and an excitation iron core 28.

Note that 29 and 30 are hydraulic cylinders 11 and 16, respectively.
31 is a hydraulic unit, 32 is a control device, and 33 is an excitation power supply circuit.

In addition, in the case of the electroforming liquid 6, the metal ions contained in the electroforming liquid 6 are supplied by electrochemical dissolution of the electroforming liquid 5, and concentration control and further liquid temperature control are required. In some cases, it may be necessary to discharge the crushed waste of the particles 7 and the grinding of the electroformed shell, so the electroforming liquid 6 and the top l! A configuration is adopted in which a model is provided that discharges fine debris from tank 2 constantly or intermittently, and after filtration and after adjusting the concentration and temperature, it is injected from the top into τ12 (via a nozzle, etc.). The illustration of the configuration is omitted. In addition, for example, in the electroforming process where the electroformed shell 9 is prohibited, the particles 7 may be removed or excluded, or conversely, they may be supplied and filled during the process.
Such a supply/discharge device etc. shall also be provided for a distance of 3 m.

The machine base 1, the electroforming tank 2, and the partition wall 3 are made of, for example, non-conductive reinforced plastic or ceramic, or the surface is ground ITh I
It is made of gold coated with T material and @ etc.

A large number of J11 holes 38, 38 are annularly provided in the partition wall 3 at a desired height, preferably at approximately 2 positions of its total height, all around its circumference. This hole allows the flow of electroforming liquid and the electroforming current f(i
However, it is preferable to prevent the electroformed metal 5 from entering the partition wall 3 and the grinding particles 7 from coming out of the partition wall 3. To do this, the metal 5 may be placed in an insulating or corrosion-resistant wire mesh that also serves as a part of the electrode 4, and the opening width of the holes 3 and 1 in the direction of the axis of movement of the matrix 8 should be set after several pots and bends. Since it is not that inconsiderate in size, there is no problem as long as particles 7 with a diameter larger than that are used, and if particles 7 with a smaller diameter are used, the particles may not fit into the holes 3a. Preferably, a pressure-resistant strainer may be provided for 7.

The partition wall 3 and current-carrying electrode 4 are replaced as appropriate according to the shape of the electroformed shell to be manufactured.

It is desirable to do so.

This partition wall 3 divides the inside of the electroforming tank 2 into two layers: an electroforming chamber in the center and an electrode chamber on the outside. The electroforming liquid 6 that is allowed to pass through and circulate and is circulated is connected to the partition wall 3.
It may also be supplied from a nozzle or the like so that it overflows.

jffi? T! The electrode 4 is made of a non-corrosive material such as electroformed metal or preferably carbon, and has two VAAs'Ki
Between the electrodes 4, electroformed metal 5 in the form of old lumps or particles is directly filled, or placed in contact with the current-carrying electrodes 4 in a wire cage (not shown) or the like.

On the other hand, in the electrolytic liquid 6 in the electroforming chamber created by the partition wall 3,
Preferably semi-conductive or insulating mechanically abrasive particles 7.7 are mixed, for example #6 particles 7.7.
A liquid honing agent such as alundum or silica having a grain size of about 0 to 1000, or a barrel depth of one method as required, such as a particle size of about 0.1 to 10 mm, is used alone or in an appropriate mixture.

The slider pull coupling 23 has a spline shaft 23a.
The spline shaft 23a is attached to the output shaft of the motor 22, the socket 23b is attached to the spindle 21 together with the iron core 28, and the latter assembly is connected to the spindle 21 through springs 24 and 25. It is supported so that it can freely vibrate in the axial direction.

Therefore, when an oscillating current flows through the oscillating coil 27, the iron core 2
8 and the spindle 21 vibrate in the axial direction together with the electroforming master mold 8, and even when the assembly is vibrating, the rotation of the motor 22 is transmitted to the spindle 21.

Since the head 20 supported by the arm 19 is raised and lowered by the hydraulic cylinder 17, the W.
iElectroforming mother mold @de, electric &! Peeling the shell 9 & 1 [Perform work etc.
) Outside, during the energizing period for electroforming, the electroforming mother mold 8 is connected to the energizing hole 3.
The head 20 is lowered and lowered with a stroke larger than the height of the electroformed shell 9 so that the head 20 can repeatedly pass back and forth over the front surface of the electroformed shell 9.

That is, when performing electroforming, turn on the switch 14 and turn on the power supply 1.
3, the electroforming current is passed through the current-carrying holes 3a, 38 and the electroforming liquid 6 from the current-carrying electrode 4 to the current-carrying holes 38, 38 of the electroforming mother mold 8.
The electroformed shell 9 is formed on the electroformed shell 8 by energizing the corresponding parts, but at this time, the shape of the electroformed shell to be manufactured in advance,
According to a predetermined program according to the thickness, etc., the four-way switching valve 30 is controlled to give the piston rod 17 a desired speed change and the piston rod 17 is repeatedly tightened.At the same time, the motor 22 is rotated. If so, an oscillating current is applied to the oscillating coil 27 and 1 [! 1 roll)! l! Axial vibration with the force! It is something that makes you move.

The number of revolutions of the motor 21 is 20 depending on the size of the electroforming mother mold 8.
The rotation speed is appropriately selected from the range of 0 to 2.00 Orpm, but it is recommended that the rotation speed be approximately 1.00 Orpm for a commonly used electroformed shell. Normally, if the speed is 20 Orpm or less, the growth of dendrites will be inhibited and the grain will become female, but if the speed is 2.00 Orpm or more, it is not necessary to roll over 1 m. Also in vibrational motion Cm
For example, it is recommended that the vibration frequency is 2 to 10 cycles/second, preferably 3 to 5 cycles/second, and the vibration frequency is 2 to 10 mm, preferably 5 mm after bending.

Further, the frequency of the reciprocating motion in the axial direction of the tapered electroforming mold 8 applied to the head 2o by raising and lowering the rod 17 is slower than the vibration, preferably 5 to 0.1 cycles/sec, preferably 3 to 0 cycles/sec. The stroke of the reciprocating movement should be approximately equal to or more than the axial length of the mother mold 8 as long as the mother mold 8 does not come out of the liquid 6. In addition, in the case of the electroformed mother mold 8 of the illustrated embodiment, if an electroformed shell having a uniform thickness is obtained throughout, the area of the same-width annular portion on the I!l end side is larger than that on the tip side. Therefore, the speed of the reciprocating motion can be controlled and changed approximately in proportion to the area.

Electroforming operation 11 is performed as follows.

First of all? ! ! The mold 8 may be made of an alloy such as stainless steel, but in the case of Ni electroforming, it is preferable to use a Nl metal block or a covering such as old plating.

Then, it is cut to the desired shape and dimensions, ground, and polished to a mirror finish. This is electroforming #! 9 can be peeled off after manufacturing, and in order to make the mirror surface part removable, a very thin oxide film is formed by exposing the mirror surface part to the air for a predetermined period of time. The #I matrix 8 is attached to the hem of the electroforming device of the present invention, and inserted into the electroforming solution 6 in the electroforming tank 2 which has not yet been filled with the particles 7. Plating is performed, and the electroforming solution 6 is once removed and exposed to air to oxidize or oxidize part or all of the plating film. In this way, without introducing the particles 7.7, the electroforming mother mold 8 is rotated and rolled, and is subjected to shoulder-down reciprocating motion, or while being vibrated, under electroforming conditions at about the conventional passing speed. Electroforming is performed, and particles 7.7 are supplied and filled at a point where an approximately 0.2 to 0.3 mm thick electro&Pi layer is formed on the oxidized vJ and v74 surfaces, and dendrites and the like begin to form to a certain extent. , the current can be increased by using the present invention? This avoids moving to the manufacturing process of Li cast shells. This is so that the produced electroformed shell 9 can be detached relatively easily, and particles 7 are placed on the surface of the electroformed mold 8 during peeling and during the above-mentioned surface 19 and base plating. This is to enable repeated use without causing damage to the mirror surface and Oi! When plating the lower part of the shield, the partition wall 3 is not particularly necessary, so the partition wall 3 may not be provided in that case, and the electroforming mother mold 8 can be moved up and down in a reciprocating manner to achieve the above-mentioned mirror surface. There is no need for plating etc.

Therefore, in the present invention, the current density is around 15 to 40 Δ/dm2, which is 5 to 10 times the conventional current density, or more.
In some cases, electroforming is carried out by applying current at a high current density of 80 to 1008/dm2 culm, but in the present invention, this electroforming current is supplied to the electroforming surface through the current carrying hole 3a. Therefore, electrodeposition is concentrated on a portion of the electroformed surface that passes through the current-carrying hole 3a.

This is so-called zone brating.

Depending on the shape and dimensions of the electroforming mother mold 8, the electrodeposition may be concentrated in dots or the like using a beam-like current, rather than in a ring or band shape as described above, and the beam-like current may be used to cover m casting surfaces. Sometimes scanning is also done.

Thus, the electroforming mother mold 8 passes back and forth in front of the current-carrying hole 3a at a desired speed according to a predetermined program, receives a strong current 2, and is also subjected to the above-mentioned rotational movement and vibrational movement applied as necessary. Since the growth and length of dendrites, needles, and crystals are suppressed, an electroformed shell 9 having a desired thickness distribution is formed within a short time.

Even if dendrites, needles, etc. start to form during C1 electroforming, particles 7 and fti The length is not such that the length is reduced and disappears due to friction and barrel polishing action, but the action of pressing and compressing the formed electroformed shell 9 against the surface of the matrix 8 by the light hitting action of a kind of particles 7 each time it is deposited. This makes it possible to form an electroformed shell 9 with high density.

Therefore, at M & original density 0Δ/dm2, approximately 0.5 mm/
At a speed of Ilr and at 80A/dm2 approximately 1 m
An electroformed shell is formed at a speed of m/Ilr, but in the case of the present invention, the growth of dendrites and acicular crystals is hardly observed during the work in the electroformed shell of a normal shape, and there are some irregularities etc. Even if it does occur, it is rare that electroforming must be interrupted and machining performed.

In addition, during electroforming, the electroforming is temporarily stopped to check the progress, and the electroforming liquid 6 is dropped or the electroforming mother mold 8 is pulled up and the surface of the electroformed shell 9 is exposed to the air. Even in such a case, when restarting electroforming, by applying reciprocating motion, rotation, and even vibration without applying electroforming current or with a slightly reduced current, it is possible to restart electroforming. Remove the oxide film etc. on the surface of l shell 9 by barrel polishing,
Purpose: By transferring to the electroformed shell, no defect layer is created in the electroformed shell, and this does not occur during electroforming, after dendrites, etc. are removed by machining.
9) also applies to the case of re-casting, and is extremely useful since it does not require the problem of waste liquid treatment or the time and effort required in the past.

The auxiliary cathode 1O is used to prevent excessive electrodeposition from occurring at the corners of the lower end surface of the electrode shell 9, and is mainly used near the electroforming matrix 8 in the early stage of electroprotection. By bringing them close together and raising and lowering them in synchronization with this, the voltage
This is to prevent excessive electrodeposition from occurring on the outer peripheral edge of the lower end of the electroforming mold 8 by inducing a part of the t current.

However, if the cathode 10 is moved sufficiently close to the electroforming matrix 8, it will act at substantially the same potential as the matrix 8, so it is not necessarily necessary to connect it to the power source 13. Since the cathode 10 is intended to eliminate the shape effect of the matrix 8, it may be an insulator that can reduce the shape effect.

Since the present invention is configured like a red ball, the surface of the electroforming mold 80 is zone-plated or scanned by the high-density current beam flowing out from the current-carrying hole 3a by vertical movement passing through the current-carrying hole 3a, and at the same time, the electroforming surface is is subjected to liquid honing or barrel polishing between the particles 7 through the vertical and reciprocating movement and rotational movement, or the added vibration movement, so that the growth of dendrites and monomorphic crystals is suppressed, and 71
Since one casting surface is constantly activated, iAi is several tens of times higher than conventional
This makes it possible to perform Wi&tJ at a current density.

Therefore, according to the present invention, not only can the cost of electroforming be significantly reduced, but there is also no need to use chemicals that are dangerous and may cause pollution, and automatic forming can be carried out unattended for long periods of time, such as at night. The benefits are immeasurable, and especially when electroforming is carried out under rotational motion with the center axis of the electroformed shell in the middle and up, as in the case of Kogyoku, the particles 7 Combined with the light tapping action of the intervening stopper 7, the electroformed crystal force grows in the direction perpendicular to the radius of the electroformed shell, increasing compressive and tensile strength in that direction, making it suitable for use in molds. electroformed shell 9
It also has the advantage of being visible.

Note that the structure of the present invention is not limited to the embodiment of Kodama; in short, the present invention is applicable to electroforming, in which the electroformed surface is subjected to a grinding process similar to liquid honing or Neurel polishing. -, zone brating or l:1 scanning brating technique for part n! Since the purpose is to perform electroforming by applying current at a high density, the shape of the equipment,
In particular, the shapes of the partition walls, current-carrying electrodes, etc., arrangement of current-carrying holes, etc. can be freely changed by δ1 according to the purpose of electroforming, the shape of the electroformed shell, etc.

That is, in the present invention, a current is passed through the front surface of the current-carrying hole on the electroformed surface at a high density, and hard fine particles capable of mechanical grinding or abrasion are added to the electroforming solution. Alternatively, particles such as a dip may be mixed in and the electroforming u...! : Strong relative motion is applied between the electroforming liquid to force the particles to collide and contact with the electroformed surface, thereby stopping the growth of dendrites and chimes to form a smooth and uniform electroformed shell. Generate·
Since it is a material that tightens υ-, what is the arrangement of the current carrying holes for partial W1 casting and the mode of reciprocating movement to allow the electroformed surface to pass in front of the current passing hole? You can freely change it depending on the shape of the Ii casting mold, for example, Den 1? The mother die 8 may move or move the current carrying hole 3a or the electroforming tank 2.
Depending on the situation, the inside of the partition wall 3 may be used as an electrode chamber and the outside thereof may be used as an electroforming chamber, or the partition wall 3 may be used as a horizontal partition plate f'! ! Sometimes the entire casting tank is divided into two upper and lower chambers, with the upper chamber used as the electroforming chamber and the lower chamber used as the electrode chamber.Furthermore, the partition wall is made prefabricated so that the N method such as the position and width of the energizing hole can be adjusted. In addition, the number of electroforming molds inserted into the electroforming chamber is not always limited to one + tn, but may be multiple. ! !
It can also be configured to accept a casting mold, and further,
The mode of motion given to the electroformed shell or electroformed mother mold for polishing work is not only the upper E'A reciprocating motion and rotational motion, but also the combination of vibrations, such as planetary motion or intermittent reversal motion. Naturally, it is also possible to use the electroforming liquid instead of the W1 cast shell in a jet or circulating flow, and furthermore, it is possible to use not only the particles mentioned above but also bristles for polishing. Rotating brushes and belt-type polishing tools, etc., may be used in conjunction with electric v! The style and structure of the tank, the support device for the electroforming mother mold, and the drive device can be freely changed by using widely known devices within the scope of the purpose of the present invention, and the present invention covers all of them. It encompasses everything.

Since the present invention is structured like a cooking method, it is possible to provide an extremely efficient electroforming device and electroforming method.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of an electroforming apparatus according to the present invention. 1----------1 machine 2--1--
--------・----11---- Partition wall 4-1---
−−−−−・−Electrifying electrode 5−−−−−−−−−−Electroformed metal block 6−−−−−−−−−−−Electroforming 7−−−−−−−− ---------・Fine particles 8----
---・-'iuv matrix 9 ------------ One electroforming shell + 3 ---------- One electroforming power source 14 ---
---
-1~---~------Piston rod 18~---
11--------Encoder 19--
−−−−−−−−−−Arm 20−−−−−−−−−
---Head 21-------------Spindle 22--------・--・---Motor 2
3---------------Slider pull coupling 24.25------Spring 26---
−−−・・・−−−−111−−・−Spring adjustment screw 2
7'--------- Single excitation coil 28--
−−−−−−−−−−−−−・−Iron core 29.30−−
-------・------Four-way switching brake r3 ]----
1 ---------- 1 Hydraulic unit 32 ----
−−−−−−−−−−−1 Controller Patent Applicant Agent for Japax Kasei Co., Ltd. (7524) Mogami Shota Section Procedural Amendment September 28, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1 , Indication of the case 1982 Patent Application No. 125104-2, Name of the invention Electroforming device and method for manufacturing electroformed shell 3, ? Relationship with the ill-correcting case Patent applicant address: 100 Itado, Takatsu-ku, Yozaki City, Kanagawa Prefecture Name: Japax Kasei Co., Ltd. Representative 1) Takashi Mizo 4, Agent 107 Th 583-0306 Address: Tokyo, Japan 1-8-1-6 Akasaka, Minato-ku, number of inventions increased by amendment 0 7, aY of the invention in the specification subject to amendment: Column for relative explanation, column for brief explanation of drawings, and drawing 8, Amendment Contents As per attached sheet, 8.7!1 Correct contents 1) "Grind grain 7" on page 8, line 11 of the specification is corrected to "particle 7." 2) From the 114th line to the 15th line of page 10 of the specification, "hydraulic cylinder 17" is replaced with "hydraulic cylinder 16".
” he corrected. 3) In the fourth line of page 11 of the specification, "electroformed shell 8" is corrected to "electroformed mother mold 8." 4) The phrase "electroformed metal ingot" in the third line of page 21 of the specification is amended to read "electroformed metal." 5) In the 5th line of page 21 of the specification, [fine particles J] has been changed to ``
Correct as "particles". 6) The phrase "iron core" in the second line of page 22 of the specification is amended to read "excitation iron core." 7) Replace the drawings attached to the specification with the drawings attached to the written amendment of this procedure.

Claims (1)

[Claims] 1) An electroforming tank into which an electroforming solution is introduced, a device for inserting and supporting an electroforming mold into the electroforming tank, and a current-carrying electrode and electroformed metal provided in the electroforming tank. and a power supply capable of supplying an electroforming current between the electroforming mother mold and the current-carrying electrode, in which a non-conductive partition wall having a current-carrying hole is provided at a desired axial height. The inside of the electroforming tank is divided into two layers: the electroforming chamber where the electroforming mother mold is inserted and the electrode chamber where the current-carrying electrode and electrode metal are inserted. The electric & I device described above is further provided with a moving device capable of repeatedly making reciprocating movements in front of the electricity supply holes and also making desired rotational movements and/or vibrational movements. 2) Using an electroforming tank that is divided into an electroforming chamber into which the Wi electroforming mother mold is inserted and an electrode chamber into which the current-carrying electrode and electroformed metal are inserted by a non-conductive partition wall having current-carrying holes, A known electroforming solution is introduced into the electroforming tank, and a large number of preferably semi-conductive or non-conductive particles having mechanical grinding ability are mixed into the electroforming solution in the electroforming chamber. The electroforming mother mold to be inserted into the mold has a space that is longer than the total axial length of the electroforming mother mold in front of the above-mentioned current carrying hole).
1: Repeated reciprocating motion relative to the current-carrying hole with the 11 l-r to give a desired rotational movement and/or vibrational movement, and flowing an electroforming current through the current-carrying hole between the current-carrying electrode and the current-carrying electrode. A method for producing a tU electroformed shell, which comprises forming an electroformed shell on an electroformed mother mold. 3) If each motion given to the electroforming mother mold is the reciprocating motion, the number of reciprocations is 5 to 0.1 cycles/sec, and if the motion is rotational motion, the number of reciprocations is 200 to 0.1 cycles/second around the axis. 2,
000 rpm, and if the motion is a vibrational motion, the frequency is 2 to 10 cycles/sec, the amplitude is 2.
1. The method for producing an electroformed shell according to claim 2, wherein the axial vibration motion is 10 mm.