JP6937664B2 - Rod manufacturing method and masking jig - Google Patents

Description

The present invention relates to a rod manufacturing method and a masking jig.

There is a plating hanger whose height can be adjusted according to the size of the work (see, for example, Patent Document 1).

Jikkenhei 7-40774

It is required to improve the productivity when plating the rod.

Therefore, an object of the present invention is to provide a rod manufacturing method and a masking jig capable of improving productivity when performing a plating process.

In order to achieve the above object, the method for manufacturing a rod according to the present invention includes a large diameter portion, a small diameter portion having a diameter smaller than that of the large diameter portion, and a flange portion connecting the large diameter portion and the small diameter portion. This is a method for manufacturing a rod in which the large-diameter portion of the rod having the above-mentioned is plated. Using a masking jig having a through path that is outside in the radial direction of the accommodating hole and penetrates from one side to the other along the axial direction of the accommodating hole, the contact portion is directed upward. By arranging a masking jig and flowing the plating solution toward the masking jig from below, the small diameter portion is accommodated in the accommodating hole, the abutting portion is brought into contact with the flange portion, and the plating solution is applied. It was configured to flow through a through path and come into contact with the large diameter portion.

The masking jig according to the present invention is applied to the large-diameter portion of a rod having a large-diameter portion, a small-diameter portion having a smaller diameter than the large-diameter portion, and a flange portion connecting the large-diameter portion and the small-diameter portion. A masking jig used for plating, which is a contact between an accommodating hole accommodating the small diameter portion and an contact that extends outward in the radial direction of the accommodating hole from the accommodating hole and can come into contact with the flange portion. A configuration including a portion and a through path for flowing a plating solution which is outside the abutting portion in the radial direction of the accommodating hole and penetrates from one side to the other along the axial direction of the accommodating hole. And said.

According to the present invention, it is possible to improve the productivity when performing the plating treatment.

It is sectional drawing which shows the cylinder apparatus which includes the rod manufactured by the manufacturing method of the rod of one Embodiment which concerns on this invention. It is sectional drawing which showed the plating apparatus used in the manufacturing method of the rod of one Embodiment which concerns on this invention, and made the masking jig a cross section by line II-II shown in FIG. It is a plan sectional view which shows the masking jig and the electrode used in the manufacturing method of the rod of one Embodiment which concerns on this invention. It is sectional drawing which shows the state before the plating process of the plating apparatus used in the manufacturing method of the rod of one Embodiment which concerns on this invention. It is sectional drawing which shows the state at the time of the plating process of the plating apparatus used in the manufacturing method of the rod of one Embodiment which concerns on this invention. It is sectional drawing which shows the state at the time of the plating process of the plating apparatus including another masking jig used in the manufacturing method of the rod of one Embodiment which concerns on this invention. Other examples of the masking jig used in the method for manufacturing a rod according to the present invention are shown, in which (a) is a cross-sectional view taken along the line XX'of (b) and (b) is (a). ) YY'Cross section. Other examples of the masking jig used in the method for manufacturing a rod according to the present invention are shown, in which (a) is a plan view and (b) is an XX'cross-sectional view of (a). Is.

A method for manufacturing a rod and a masking jig according to an embodiment of the present invention will be described below with reference to the drawings.

First, the cylinder device 11 including the rod 10 manufactured by the manufacturing method of the present embodiment will be described with reference to FIG. The cylinder device 11 shown in FIG. 1 is a shock absorber used in a suspension device of a vehicle such as an automobile or a railroad vehicle, and specifically, is a shock absorber used in a strut type suspension of an automobile. In the cylinder device 11, the working liquid and the working gas are sealed between the cylindrical inner cylinder 12 in which the working liquid is sealed and the inner cylinder 12 provided on the outer peripheral side of the inner cylinder 12 having a diameter larger than that of the inner cylinder 12. It has a bottomed cylindrical outer cylinder 14 forming a reservoir chamber 13 to be formed. That is, the cylinder device 11 is a double-cylinder type shock absorber in which the inner cylinder 12 is provided in the outer cylinder 14.

The outer cylinder 14 is an integrally molded product made of one metal member, and the cylindrical side wall portion 17, the bottom portion 18 that closes one end side of the side wall portion 17 in the axial direction, and the bottom portion 18 of the side wall portion 17 are It has an opening 19 on the opposite side. The central axes of the side wall 17 and the bottom 18 are the central axes of the outer cylinder 14.

The bottom portion 18 has a tapered tubular portion 21 extending from the axial end edge portion of the side wall portion 17 so as to decrease in diameter toward the side wall portion 17, and a side surface of the tapered tubular portion 21 opposite to the side wall portion 17. The diameter of the flat plate-shaped annulus 22 extending inward in the radial direction from the end edge is reduced as the distance from the annulus 22 is from the end edge of the annulus 22 opposite to the tapered tubular portion 21. It has a tapered tubular portion 23 extending in the radial direction from an end edge portion of the tapered tubular portion 23 opposite to the annulus portion 22, and a flat plate-shaped disc portion 24 extending inward in the radial direction. ing. The tapered tubular portions 21 and 23 have a tapered shape centered on the central axis of the outer cylinder 14, and the annulus portion 22 and the disc portion 24 extend orthogonally to the central axis of the outer cylinder 14. There is.

The inner cylinder 12 is an integrally molded product made of one metal member and has a cylindrical shape. The inner cylinder 12 is engaged with the bottom portion 18 of the outer cylinder 14 via an annular base member 30 attached to one end in the axial direction thereof. Further, the inner cylinder 12 is engaged with the bottom portion 18 of the side wall portion 17 of the outer cylinder 14 via an annular rod guide 31 attached to the other end portion in the axial direction thereof.

The base member 30 is placed on the bottom 18 of the outer cylinder 14 in a state of being fitted and fixed to the inner cylinder 12. The base member 30 is placed on the annular portion 22 of the bottom portion 18, and at that time, the base member 30 is positioned in the radial direction by the tapered tubular portion 21. As a result, the base member 30 is arranged coaxially with the outer cylinder 14, and as a result, one end portion of the inner cylinder 12 in the axial direction is arranged coaxially with the outer cylinder 14.

The rod guide 31 is fitted to the inner cylinder 12 and the side wall portion 17 of the outer cylinder 14, so that the other end portion of the inner cylinder 12 in the axial direction is arranged coaxially with the outer cylinder 14. An annular seal member 33 is arranged on the opposite side of the rod guide 31 from the bottom portion 18, and the seal member 33 is also fitted to the inner peripheral portion of the side wall portion 17. A crimping portion 34 that is plastically deformed inward in the radial direction by curling is formed on the opening 19 side opposite to the bottom portion 18 of the side wall portion 17, and the sealing member 33 is the crimping portion 34. Is sandwiched between the rod guide 31 and the rod guide 31. The sealing member 33 seals the opening 19 side of the outer cylinder 14 by locking the outer side in the axial direction with the crimping portion 34.

A piston 35 is slidably fitted in the inner cylinder 12. The piston 35 defines a first chamber 38 and a second chamber 39 in the inner cylinder 12. The first chamber 38 is provided between the piston 35 in the inner cylinder 12 and the rod guide 31, and the second chamber 39 is provided between the piston 35 in the inner cylinder 12 and the base member 30. The second chamber 39 in the inner cylinder 12 is defined as the reservoir chamber 13 by the base member 30 provided on one end side of the inner cylinder 12. The first chamber 38 and the second chamber 39 are filled with an oil liquid which is a working liquid, and the reservoir chamber 13 is filled with a gas which is a working gas and an oil liquid which is a working liquid.

A rod 10 is connected to the piston 35 by a nut 43. The rod 10 has a columnar large-diameter portion 61, a columnar small-diameter portion 62 having a diameter smaller than that of the large-diameter portion 61, and an annular flange portion 63 connecting the large-diameter portion 61 and the small-diameter portion 62. doing. The large diameter portion 61 and the small diameter portion 62 are arranged coaxially.

The large-diameter portion 61 has an outer diameter surface 71 formed of a cylindrical surface and a tapered surface 72 extending from the edge portion of the outer diameter surface 71 on the small-diameter portion 62 side toward the small-diameter portion 62, and having a smaller diameter toward the extending tip side. And have. The flange portion 63 has an axially orthogonal surface 75 formed of an annular flat surface extending inward in the radial direction from an end edge portion of the tapered surface 72 opposite to the outer diameter surface 71. The small diameter portion 62 has an outer diameter surface 78 formed of a cylindrical surface extending from the inner peripheral edge portion of the axially orthogonal surface 75 to the side opposite to the large diameter portion 61 in the axial direction, and an axially large diameter portion of the outer diameter surface 78. It has a male screw portion 79 formed on the opposite side to the 61. The piston 35 is fitted to the outer diameter surface 78 of the small diameter portion 62, and is in contact with the axis orthogonal surface 75 of the flange portion 63. The nut 43 is screwed into the male screw portion 79 of the small diameter portion 62.

The rod 10 extends from the inner cylinder 12 and the outer cylinder 14 to the outside through the rod guide 31 and the seal member 33 on the outer diameter surface 71 of the large diameter portion 61. As a result, one end of the rod 10 is arranged inside the outer cylinder 14 and the inner cylinder 12, and the other end side is arranged outside the outer cylinder 14 and the inner cylinder 12. In the rod 10, the outer diameter surface 71 of the large diameter portion 61 is in sliding contact with the rod guide 31, and is guided by the rod guide 31 with respect to the inner cylinder 12 and the outer cylinder 14 in the axial direction integrally with the piston 35. Move to. In the rod 10, the outer diameter surface 71 of the large diameter portion 61 is in sliding contact with the seal member 33, and the seal member 33 closes between the outer cylinder 14 and the rod 10 to form a working liquid in the inner cylinder 12. And, the working gas and the working liquid in the reservoir chamber 13 are regulated from leaking to the outside.

The piston 35 is formed with a passage 44 and a passage 45 penetrating in the axial direction. The passages 44 and 45 allow the first chamber 38 and the second chamber 39 to communicate with each other. The piston 35 is provided with an annular disc valve 46 that can close the passage 44 by contacting the piston 35 on the side opposite to the bottom portion 18 in the axial direction. Further, the piston 35 is provided with an annular disc valve 47 on the bottom 18 side in the axial direction, which can close the passage 45 by contacting the piston 35.

In the disc valve 46, the rod 10 moves to the contraction side that increases the amount of entry into the inner cylinder 12 and the outer cylinder 14, the piston 35 moves in the direction of narrowing the second chamber 39, and the pressure in the second chamber 39 becomes the first. When the pressure is higher than the pressure of the chamber 38 by a predetermined value or more, the passage 44 is opened, and the damping valve generates a damping force at that time. In the disc valve 47, the rod 10 moves to the extension side that increases the amount of protrusion from the inner cylinder 12 and the outer cylinder 14, the piston 35 moves in the direction of narrowing the first chamber 38, and the pressure of the first chamber 38 becomes the second chamber. When the pressure is higher than the pressure of 39 by a predetermined value or more, the passage 45 is opened, and the damping valve generates a damping force at that time.

The base member 30 is formed with a passage 52 and a passage 53 penetrating in the axial direction. The passages 52 and 53 can communicate with the second chamber 39 and the reservoir chamber 13. An annular disc valve 55 capable of closing the passage 52 by abutting against the base member 30 is arranged on the base member 30 on the side of the bottom 18 in the axial direction, and is located on the side opposite to the bottom 18 in the axial direction. An annular disc valve 56 that can close the passage 53 by abutting against the base member 30 is arranged.

The disc valve 55 opens the passage 52 when the rod 10 moves to the contraction side and the pressure in the second chamber 39 becomes higher than the pressure in the reservoir chamber 13 by a predetermined value or more, and the damping force is generated at that time. It is a valve. The disc valve 56 opens the passage 53 when the rod 10 moves to the extension side, the piston 35 moves to the first chamber 38 side, and the pressure in the second chamber 39 drops below the pressure in the reservoir chamber 13. It is a suction valve that allows the working liquid to flow from the reservoir chamber 13 into the second chamber 39 without substantially generating a damping force.

A cylindrical mounting eye 58 is fixed to the outside of the disk portion 24 of the bottom portion 18 of the outer cylinder 14 by welding. In the cylinder device 11, for example, the rod 10 is connected to the vehicle body side and the mounting eye 58 is connected to the wheel side of the vehicle to generate a damping force with respect to the movement of the wheels with respect to the vehicle body. In the cylinder device 11, the rod 10 and the outer cylinder 14 receive an impact force from the outside.

Next, a method of manufacturing the rod 10 of the present embodiment will be described. The rod 10 is made of metal and slides on the rod guide 31 and the seal member 33 in the large diameter portion 61. Further, the flange portion 63 abuts on the piston 35, and the nut 43 is screwed into the male screw portion 79 of the small diameter portion 62. The rod 10 is an object to be plated, and the plating is electrodeposited on a large diameter portion 61 that slides on the rod guide 31 and the seal member 33 or is exposed to the outside of the seal member 33. NS. Specifically, plating is electrodeposited on the outer diameter surface 71 and the tapered surface 72 of the large diameter portion 61. On the other hand, plating electrodeposition is suppressed on the axially orthogonal surface 75 of the flange portion 63, the outer diameter surface 78 of the small diameter portion 62, and the male thread portion 79, which are always inside the inner cylinder 12 filled with the oil liquid. ..

In the method for manufacturing the rod 10 of the present embodiment, the rod 10 is shielded from the axially orthogonal surface 75 of the flange portion 63, the outer diameter surface 78 of the small diameter portion 62, and the male screw portion 79, which are not to be electrodeposited with plating. At the same time, the plating is electrodeposited on the outer diameter surface 71 and the tapered surface 72 of the large diameter portion 61.

As shown in FIG. 2, the plating processing device 81 used in the method for manufacturing the rod 10 of the present embodiment grips the transfer robot that grips the portion of the rod 10 opposite to the small diameter portion 62 rather than the large diameter portion 61. It has a part 82. The grip portion 82 grips the rod 10 in a state of extending vertically downward from the grip portion 82. The grip portion 82 can be raised and lowered up and down. The rod 10 gripped by the grip portion 82 is along the vertical direction, and the small diameter portion 62 is arranged below the large diameter portion 61.

The plating processing apparatus 81 includes a processing tank main body 86 having an insertion port 85 at the upper portion into which a rod 10 gripped by the grip portion 82 and descending together with the grip portion 82 can enter. Further, the plating processing apparatus 81 has an electrode 92 in the processing tank main body 86 having an insertion port 91 at the upper portion into which a rod 10 gripped by the gripping portion 82 and descending together with the gripping portion 82 can enter. The insertion port 91 of the electrode 92 is arranged lower than the insertion port 85 of the processing tank main body 86. The electrode 92 has a cylindrical wall electrode portion 95 and an annular member 96 fastened to the upper end edge side of the wall electrode portion 95 by a fastening member such as a screw (not shown). The outer peripheral side of the annular member 96 has the same diameter as the outer diameter of the wall electrode portion 95, and the inner peripheral side has a diameter smaller than the inner diameter of the wall electrode portion 95. That is, the annular member 96 has a portion extending inward in the radial direction from the wall electrode portion 95 on the inner peripheral side. Further, the annular member 96 is an insulator. The annular member 96 acts as a stopper to prevent the masking jig 111 from popping out from the electrode 92. It is desirable to fasten the annular member 96 to the wall electrode portion 95 with a fastening member so that the masking jig 111 can be easily removed when the masking jig 111 is replaced. The annular member 96 may be integrated with the wall electrode portion 95 as an annular inward extending electrode portion that slightly extends inward in the radial direction from the upper end edge portion of the wall electrode portion 95, and may also serve as an electrode.

The plating processing apparatus 81 has a masking jig 111 arranged inside the wall electrode portion 95 of the electrode 92. The masking jig 111 is used to mask the flange portion 63 and the small diameter portion 62 of the rod 10 when plating the large diameter portion 61 of the rod 10. The masking jig 111 can move independently of the electrode 92, can slide on the cylindrical inner peripheral surface 98 of the wall electrode portion 95, and can move up and down.

The masking jig 111 has a cylindrical outer diameter surface 112 that is in sliding contact with the inner peripheral surface 98 of the wall electrode portion 95. In the masking jig 111, an accommodating hole 115, which is a circular hole, is formed in the center in the radial direction along the axial direction. The accommodating hole 115 is formed from one end in the axial direction of the masking jig 111 to an intermediate position on the other end side. In other words, the accommodating hole 115 is a bag hole having an opening 116 at one end in the axial direction of the masking jig 111 and not opening at the other end. The accommodating hole 115 has a cylindrical inner wall surface 117 and a bottom surface 118 extending inward in the radial direction from an edge portion of the inner wall surface 117 opposite to the opening 116. The inner diameter of the accommodating hole 115 is larger than the outer diameter of the small diameter portion 62 of the rod 10, and is smaller than the maximum diameter of the axially orthogonal surface 75 of the flange portion 63. Further, the depth of the accommodating hole 115 is deeper than the axial length of the small diameter portion 62 of the rod 10. As a result, the small diameter portion 62 of the rod 10 can be accommodated in the accommodating hole 115, and the flange portion 63 and the large diameter portion 61 cannot be accommodated.

On the masking jig 111, at the end of the accommodating hole 115 on the opening 116 side, the outer side of the accommodating hole 115 in the radial direction of the accommodating hole 115, in other words, the outer side of the accommodating hole 115 in the radial direction of the masking jig 111. It has an abutting portion 121 that extends to. The contact portion 121 has a flat annular contact surface 122 that extends orthogonally to the axial direction of the masking jig 111. The minimum diameter of the contact surface 122 is equal to the inner diameter of the accommodating hole 115, is smaller than the maximum diameter of the shaft orthogonal surface 75 of the flange portion 63 of the rod 10, and is larger than the minimum diameter of the shaft orthogonal surface 75. It has become. Further, the maximum diameter of the contact surface 122 is larger than the maximum diameter of the axis orthogonal surface 75. Therefore, the flange portion 63 of the rod 10 in which the small diameter portion 62 is accommodated in the accommodating hole 115 can be brought into contact with the abutting portion 121 on the axially orthogonal surface 75. When the small diameter portion 62 is accommodated in the accommodating hole 115 in a coaxial state in which the central axes are aligned, the axis orthogonal surface 75 abuts on the abutting surface 122 over the entire circumference.
In the present embodiment, the contact surface 122 of the masking jig 111 is a flat annular surface that extends orthogonally to the axial direction of the masking jig 111, but the rod 10 is provided with a tapered surface 72. In the above, as shown in FIG. 7, it is desirable that the contact surface 122 of the masking jig 111 is also a tapered surface. In order to make the lower section of the tapered surface 72 hit the annular contact surface 122, the range of the angle B formed by the annular contact surface 122 and the cylindrical inner wall surface 117 is the angle of the tapered surface 72. Is A, the range is 90 ° <B <(180-A).
Considering the case where the flat contact surface 122 is applied to this and the range, the range of B is
90 ° ≤ B <(180-A)
Will be.

The masking jig 111 is formed with a groove-shaped through-passage 125 that is recessed inward in the radial direction from the outer diameter surface 112. The gangway 125 penetrates the masking jig 111 from one end side to the other end side along the axial direction of the masking jig 111, in other words, the axial direction of the accommodating hole 115. As shown in FIG. 3, the masking jig 111 is formed with a plurality of through-passages 125 at equal intervals in the circumferential direction, specifically, four locations. The gangway 125 is arranged outside the contact portion 121 in the radial direction of the accommodating hole 115, in other words, outside the contact portion 121 in the radial direction of the masking jig 111. These through-passages 125 are passages for circulating the plating solution through which the plating solution passes in the axial direction of the masking jig 111. The gangway 125 of the present embodiment has a concave cross section as shown in FIG. 3, but this shape may be circular or any shape.

As shown in FIG. 2, the masking jig 111 has a hollow portion 131 formed at an intermediate position in the axial direction along the axial direction of the masking jig 111. As shown in FIG. 3, the hollow portion 131 has a circular cross section, and the masking jig 111 is formed with a plurality of hollow portions 131 at equal intervals in the circumferential direction, specifically, four locations. The hollow portion 131 is arranged outside the contact portion 121 in the radial direction of the accommodating hole 115, in other words, outside the contact portion 121 in the radial direction of the masking jig 111. The hollow portions 131 are arranged alternately with the gangway 125 in the circumferential direction of the masking jig 111 at equal intervals. These hollow portions 131 hold air and are sealed, and serve as a portion that causes buoyancy in the masking jig 111.

The masking jig 111 is made of an insulating synthetic resin material, and is an insulator as a whole. The masking jig 111 is configured so that the specific gravity is smaller than that of the plating solution. The masking jig 111 is made of, for example, polyvinyl chloride, polyvinylidene fluoride, or polytetrafluoroethylene. In the present embodiment, an example in which the entire masking jig 111 is formed of a synthetic resin material is shown, but the outer peripheral sliding surface and the hole 115 are covered with a sliding resistant inorganic material, a metal material, or the like. It can be changed as appropriate.
As shown in FIG. 8, a plurality of slits 202 are provided on the cylindrical outer peripheral surface of the central member 201 made of metal or hard resin, such as a vane of a vane pump, and the wall member 203 is embedded in each slit 202. The cylindrical member 204 may be fixed to the end of the wall member 203 opposite to the central member 201. With this configuration, the gangway 125 can be provided without being formed by processing or the like.

As shown in FIG. 2, the masking jig 111 is coaxially arranged in the wall electrode portion 95 of the electrode 92 with the contact portion 121 and the opening 116 of the accommodating hole 115 facing upward. When the masking jig 111 is lowered to the lower position of the wall electrode portion 95 by its own weight, it comes into contact with a stopper (not shown), and further lowering is restricted. The position shown in FIG. 2 at which the masking jig 111 comes into contact with a stopper (not shown) and stops is the lowest position in the elevating range, and the state at this lowest position is the standby state.

When plating the large diameter portion 61 of the rod 10, the plating processing device 81 inserts the rod 10 gripped by the grip portion 82 from the small diameter portion 62 side into the insertion port 85 of the processing tank main body 86, and further inserts the electrode 92. Is inserted into the insertion port 91 of. Then, as shown in FIG. 4, the grip portion 82 lowers the rod 10 and stops so that the large diameter portion 61 is inserted into the predetermined length electrode 92. The rod 10 that is gripped and stopped by the grip portion 82 is arranged coaxially with the electrode 92 and the masking jig 111, and stops above the masking jig 111 in the standby state.

The plating processing apparatus 81 faces the masking jig 111 which is arranged in the wall electrode portion 95 with the contact portion 121 and the opening 116 of the accommodating hole 115 facing upward as described above and is stopped at the lowest position. Then, as shown by an arrow in FIG. 5, the plating solution is flowed from the bottom to the top in the electrode 92. Then, since the masking jig 111 has a resistance structure of the plating solution and the specific gravity is smaller than that of the plating solution, buoyancy is generated by the flow of the plating solution and the masking jig 111 rises. At this time, since the hollow portion 131 is sealed, the plating solution does not enter and a stable buoyancy is generated.

The masking jig 111 raised by the plating solution stops the contact portion 121 by abutting the flange portion 63 of the rod 10 while accommodating the small diameter portion 62 of the rod 10 in the accommodating hole 115. When the masking jig 111 is pressed against the flange portion 63 of the rod 10 and stopped in this way, the plating solution flows from the bottom to the top in the through-passage 125 and comes into contact with the large diameter portion 61 in the electrode 92. The plating solution overflowing from the insertion port 91 of the electrode 92 flows downward through between the treatment tank main body 86 and the electrode 92.

In other words, the plating processing apparatus 81 arranges the masking jig 111 with the contact portion 121 and the opening 116 of the accommodating hole 115 facing upward, and flows the plating solution toward the masking jig 111 from below. As a result, the small diameter portion 62 of the rod 10 is accommodated in the accommodating hole 115 of the masking jig 111, the contact portion 121 of the masking jig 111 is brought into contact with the flange portion 63 of the rod 10, and the plating solution is brought into contact with the masking jig 111. It flows from below through the through-passage 125 of the rod 10 and comes into contact with the large-diameter portion 61 of the rod 10.

Then, in a state where the plating solution continues to flow in the electrode 92 as described above, power is supplied between the rod 10 and the contact point of the electrode 92. Then, the small diameter portion 62, which is covered with the masking jig 111 which is an insulator and the position in the axial direction overlaps with each other, is suppressed from the electrodeposition of plating, that is, the formation of the plating layer, and the position in the axial direction is set on the masking jig 111. Plating is electrodeposited on the large diameter portion 61 which is not overlapped and not covered to form a plating layer. Moreover, since the flange portion 63 of the rod 10 abuts on the contact portion 121 over the entire circumference to block the insertion port 85 and suppresses the inflow of the plating solution into the insertion port 85, the plating of the small diameter portion 62 is performed. Layer formation is further suppressed. In addition, since the outer peripheral edge portion of the flange portion 63 of the rod 10 is in contact with the contact portion 121 over the entire circumference, it is possible to move between the axis orthogonal surface 75 of the flange portion 63 and the contact surface 122 of the contact portion 121. The inflow of the plating solution is also suppressed, and thus the formation of the plating layer is also suppressed at the axially orthogonal plane 75 of the flange portion 63. Further, by narrowing the gap between the cylindrical outer diameter surface 112 of the masking jig 111 and the cylindrical inner peripheral surface 98 of the electrode portion 95, the masking jig 111 is positioned below the masking jig 111. Since it acts as a shielding plate that shields the current that should flow from the cylindrical inner peripheral surface 98 of the electrode portion 95, it suppresses the current that should be concentrated below the rod 10. This is effective in making the film thickness uniform.

When a plating layer having a predetermined thickness is formed on the large diameter portion 61, the plating processing apparatus 81 stops the plating liquid flowing from below toward the masking jig 111 in the electrode 92. Then, the masking jig 111 descends to the lowest position due to its own weight, comes into contact with the stopper, and returns to the standby state. After that, the grip portion 82 shown in FIG. 2 rises to pull up the rod 10 from the electrode 92 and the processing tank main body 86, pay out to a subsequent process, and then grip the rod 10 to be plated.

The above-mentioned Patent Document 1 describes a hanger for plating whose height can be adjusted according to the size of the work. If such a hanger for plating is used, it is necessary to adjust the height according to the size of the work, and the productivity is lowered.

On the other hand, in the present embodiment, the accommodating hole 115, the abutting portion 121 extending outward in the radial direction of the accommodating hole 115 from the accommodating hole 115, and the outer side in the radial direction of the accommodating hole 115 than the abutting portion 121. A masking jig 111 having a through-passage 125 penetrating from one side to the other along the axial direction of the accommodating hole 115 is used, and the contact portion 121 and the opening 116 of the accommodating hole 115 are formed. The masking jig 111 is arranged upward, and the rod 10 is fixed above the masking jig 111 with the small diameter portion 62 below the large diameter portion 61. Then, by flowing the plating solution from below toward the masking jig 111, the masking jig 111 is raised, the small diameter portion 62 of the rod 10 is accommodated in the accommodating hole 115, and the contact portion 121 is placed on the rod 10. The plating solution is brought into contact with the large-diameter portion 61 of the rod 10 by flowing the plating solution through the through-passage 125 from below. Plating is performed in this state.

As a result, even when a plurality of types of rods 10 having different lengths of the large diameter portion 61 are plated by the same plating processing device 81, the masking jig 111 rising from the lowest position can be used for the large diameter portion 61. The height position is different depending on the length of the collar portion 63, and the flange portion 63 and the small diameter portion 62 are satisfactorily masked by stopping according to the height position of the flange portion 63. Therefore, even when plating a plurality of types of rods 10 having different lengths of the large diameter portion 61, the axially orthogonal surface 75 of the flange portion 63 and the outer diameter surface 78 of the small diameter portion 62 for which plating is not desired to be electrodeposited. It is possible to electrodeposit the plating on the large diameter portion 61 while shielding the male screw portion 79 and without changing the setup of the plating processing apparatus 81. Therefore, the productivity at the time of performing the plating process can be improved.

Further, since the masking jig 111 is formed with a through path 125 through which the plating solution is circulated, the masking jig 111 is flown from below the masking jig 111 toward the masking jig 111 in order to raise the masking jig 111 in the electrode 92. The plating solution can be smoothly flowed above the masking jig 111 so as to come into contact with the large diameter portion 61 to be plated.

Further, since the hollow portion 131 is formed in the masking jig 111, the masking jig 111 can be satisfactorily generated with buoyancy against the plating solution. The hollow portion 131 is formed in a bag hole shape at the time of injection molding of the masking jig 111, for example, and the hollow portion 131 is formed by closing the opening with a separate lid member or the like. Even if the hollow portion 131 has an opening at the lower portion, the infiltration of the plating solution is suppressed, so that buoyancy can be generated in the masking jig 111.

The structure of the masking jig 111 may be changed according to the covering power (covering power) of the plating solution. Here, the covering power of the plating solution is the ability to electrodeposit the plating on a portion that tends to be shaded, such as a recess or the back surface. For example, in the above, the accommodating hole 115 of the masking jig 111 is a bag hole as shown in FIGS. 2 to 5, but the accommodating hole 115 penetrates the masking jig 111 in the axial direction as shown in FIG. It may be a through hole. For example, when the coating power of the plating solution is high, the accommodating hole 115 is used as a bag hole as shown in FIGS. On the other hand, when the coating force of the plating solution is low, even if the accommodating hole 115 is used as a through hole as shown in FIG. 6, for example, by increasing the axial length of the masking jig 111 as necessary, the small diameter portion of the plating Precipitation to 62 can be suppressed.

The first aspect of the embodiment described above is the rod having a large diameter portion, a small diameter portion having a diameter smaller than that of the large diameter portion, and a flange portion connecting the large diameter portion and the small diameter portion. A method for manufacturing a rod for plating a large-diameter portion, that is, an accommodating hole, a contact portion extending outward from the accommodating hole in the radial direction of the accommodating hole, and a diameter of the accommodating hole rather than the abutting portion. A masking jig having a through path that is on the outside in the direction and penetrates from one side to the other along the axial direction of the accommodating hole is used, and the masking jig is arranged with the contact portion facing upward. Then, by flowing the plating solution from below toward the masking jig, the small diameter portion is accommodated in the accommodation hole, the contact portion is brought into contact with the collar portion, and the plating solution is allowed to flow through the through path. It is characterized in that it is brought into contact with the large diameter portion. Thereby, the productivity at the time of performing the plating process can be improved.

The second aspect of the embodiment is characterized in that, in the first aspect, the masking jig is formed of an insulating synthetic resin material. As a result, plating deposited on the small diameter portion can be suppressed.

A third aspect of the embodiment is to the large-diameter portion of the rod having a large-diameter portion, a small-diameter portion having a diameter smaller than the large-diameter portion, and a flange portion connecting the large-diameter portion and the small-diameter portion. A masking jig used for plating, which is a contact between an accommodating hole accommodating the small diameter portion and an contact that extends outward in the radial direction of the accommodating hole from the accommodating hole and can come into contact with the flange portion. It has a portion and a through path for plating liquid flow that is outside the abutting portion in the radial direction of the accommodating hole and penetrates from one side to the other along the axial direction of the accommodating hole. It is a feature. Thereby, the productivity at the time of performing the plating process can be improved.

10 Rod 61 Large diameter part 62 Small diameter part 63 Collar part 111 Masking jig 115 Accommodation hole 121 Contact part 125 Through-passage

Claims (3)

A method for manufacturing a rod in which the large-diameter portion of a rod having a large-diameter portion, a small-diameter portion having a smaller diameter than the large-diameter portion, and a flange portion connecting the large-diameter portion and the small-diameter portion is plated. hand,
The accommodating hole, the abutting portion extending outward from the accommodating hole in the radial direction of the accommodating hole, and the abutting portion outside the abutting portion in the radial direction of the accommodating hole along the axial direction of the accommodating hole. Using a masking jig with a gangway that penetrates from one side to the other,
By arranging the masking jig with the abutting portion facing upward and flowing the plating solution from below toward the masking jig, the small diameter portion is accommodated in the accommodating hole and the abutting portion is placed on the collar. A method for manufacturing a rod, which comprises abutting on a portion and allowing a plating solution to flow through the through passage to bring the plating solution into contact with the large-diameter portion. The method for manufacturing a rod according to claim 1, wherein the masking jig is formed of an insulating synthetic resin material. A masking jig used when plating the large-diameter portion of a rod having a large-diameter portion, a small-diameter portion having a smaller diameter than the large-diameter portion, and a flange portion connecting the large-diameter portion and the small-diameter portion. It ’s a tool,
A storage hole for accommodating the small diameter portion and
An abutting portion that extends outward from the accommodating hole in the radial direction of the accommodating hole and can come into contact with the flange portion.
A through-passage for plating liquid flow that is outside the contact portion in the radial direction of the accommodating hole and penetrates from one side to the other along the axial direction of the accommodating hole.
A masking jig characterized by having.

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