JP6188208B2 - Masking member and method of manufacturing cylinder using the same - Google Patents

Masking member and method of manufacturing cylinder using the same Download PDF

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JP6188208B2
JP6188208B2 JP2013159893A JP2013159893A JP6188208B2 JP 6188208 B2 JP6188208 B2 JP 6188208B2 JP 2013159893 A JP2013159893 A JP 2013159893A JP 2013159893 A JP2013159893 A JP 2013159893A JP 6188208 B2 JP6188208 B2 JP 6188208B2
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cylinder
opening
masking member
peripheral surface
axial direction
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JP2015030867A (en
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将英 佐野
将英 佐野
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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本発明は、マスキング部材およびこれを用いたシリンダの製造方法に関する。   The present invention relates to a masking member and a cylinder manufacturing method using the same.

上端部が閉止し下端部側が開口する円筒状基体の外面に浸漬塗布法を用いて塗膜を形成する際に、開口部に円筒形の治具を嵌合して下部内面への塗料付着を防止する技術がある（例えば、特許文献１参照）。   When a coating film is formed on the outer surface of a cylindrical base with the upper end closed and the lower end opened using a dip coating method, a cylindrical jig is fitted into the opening to adhere the paint to the lower inner surface. There is a technique to prevent (see, for example, Patent Document 1).

特開平７−２１３９８７号公報JP-A-7-213987

ところで、有底筒状のシリンダについて内面に加えて開口部の外周面を非塗装面とする場合がある。この場合に、下部内面への塗料付着を防止しつつ開口部の外周面をマスキングすることが良好にできるマスキング部材が求められている。   By the way, in addition to the inner surface of the bottomed cylindrical cylinder, the outer peripheral surface of the opening may be a non-painted surface. In this case, there is a demand for a masking member that can satisfactorily mask the outer peripheral surface of the opening while preventing the paint from adhering to the lower inner surface.

したがって、本発明は、有底筒状のシリンダの内面への塗料付着を防止しつつ開口部の外周面をマスキングすることが良好にできるマスキング部材およびこれを用いたシリンダの製造方法の提供を目的とする。   Accordingly, an object of the present invention is to provide a masking member that can satisfactorily mask the outer peripheral surface of the opening while preventing the paint from adhering to the inner surface of the bottomed cylindrical cylinder, and a method of manufacturing a cylinder using the same. And

上記目的を達成するために、本発明は、軸方向一側がシリンダの開口部の外周面を覆う被覆部とされた外筒部と、前記外筒部の軸方向中間位置から径方向内側に突出して前記開口部の端面に当接する突出部と、前記外筒部の軸方向中間位置から前記突出部に対し軸方向の前記被覆部とは反対側にて前記突出部よりも径方向内側に延出する底部と、前記底部の径方向内側から軸方向に延出する内筒部と、を有する構成とした。   In order to achieve the above-mentioned object, the present invention has an outer cylindrical portion whose axial one side is a covering portion that covers the outer peripheral surface of the opening of the cylinder, and projects radially inward from an axial intermediate position of the outer cylindrical portion. A projecting portion that contacts the end face of the opening, and extends radially inward from the projecting portion on the opposite side of the covering portion in the axial direction from the axially intermediate position of the outer cylinder portion. It has the structure which has the bottom part to protrude and the inner cylinder part extended to the axial direction from the radial inside of the said bottom part.

本発明によれば、有底筒状のシリンダの内面への塗料付着を防止しつつ開口部の外周面をマスキングすることが良好にできる。   According to the present invention, it is possible to favorably mask the outer peripheral surface of the opening while preventing the paint from adhering to the inner surface of the bottomed cylindrical cylinder.

本発明の一実施形態に係るマスキング部材を示す断面図である。It is sectional drawing which shows the masking member which concerns on one Embodiment of this invention. 図１のＸ部の拡大断面図である。It is an expanded sectional view of the X section of FIG. 本発明の一実施形態に係るマスキング部材をシリンダに装着した状態を示す断面図である。It is sectional drawing which shows the state which mounted | wore the cylinder with the masking member which concerns on one Embodiment of this invention. 本発明の一実施形態に係るマスキング部材が装着された状態のシリンダの塗装工程を概略的に示す工程図である。It is process drawing which shows schematically the coating process of the cylinder in the state with which the masking member which concerns on one Embodiment of this invention was mounted | worn. 本発明の一実施形態に係るマスキング部材を用いて塗装されたシリンダが組み込まれる緩衝器を示す断面図である。It is sectional drawing which shows the shock absorber in which the cylinder painted using the masking member which concerns on one Embodiment of this invention is integrated. 本発明の一実施形態に係るマスキング部材の変形例を示す断面図である。It is sectional drawing which shows the modification of the masking member which concerns on one Embodiment of this invention. 図６のＹ部の拡大断面図である。It is an expanded sectional view of the Y section of FIG. 本発明の一実施形態に係るマスキング部材の変形例を示す断面図である。It is sectional drawing which shows the modification of the masking member which concerns on one Embodiment of this invention. 本発明の一実施形態に係るマスキング部材の変形例を示す断面図である。It is sectional drawing which shows the modification of the masking member which concerns on one Embodiment of this invention.

本発明の一実施形態に係るマスキング部材およびこれを用いたシリンダの製造方法を図面を参照して以下に説明する。マスキング部材は、対象部品に塗装を行う際に塗膜のない非塗装面を形成するためのものである。   A masking member according to an embodiment of the present invention and a cylinder manufacturing method using the same will be described below with reference to the drawings. A masking member is for forming the non-coating surface without a coating film, when coating to object part.

図１に示すように、本実施形態に係るマスキング部材１０は、筒状の外筒部１２と、外筒部１２の軸方向中間位置から径方向内側に突出する突出部１３と、外筒部１２の軸方向中間位置から突出部１３と軸方向に隣り合って突出部１３よりも径方向内側に延出する底部１４と、底部１４の径方向内側から軸方向に延出する筒状の内筒部１５とを有している。   As shown in FIG. 1, the masking member 10 according to the present embodiment includes a cylindrical outer cylinder portion 12, a protruding portion 13 that protrudes radially inward from an axial intermediate position of the outer cylinder portion 12, and an outer cylinder portion. A bottom 14 extending axially inward of the protrusion 13 from the axial intermediate position of 12 and extending inward in the radial direction from the protrusion 13; and a cylindrical inner portion extending in the axial direction from the radially inner side of the bottom 14. And a cylindrical portion 15.

外筒部１２は、突出部１３および底部１４に繋がる軸方向中間部の基筒部２０と、基筒部２０よりも軸方向一側にあって突出部１３の位置から底部１４とは反対側に延出する一端筒部（被覆部）２１と、基筒部２０よりも軸方向他側にあって底部１４の位置から突出部１３とは反対側に延出する他端筒部２２とを有している。他端筒部２２の軸方向長さは一端筒部２１の軸方向長さよりも長くなっている。   The outer cylinder part 12 is an axially intermediate base cylinder part 20 connected to the projecting part 13 and the bottom part 14, and is located on one side in the axial direction from the base cylinder part 20 and opposite to the bottom part 14 from the position of the projecting part 13. One end cylindrical portion (covering portion) 21 extending to the other end, and the other end cylindrical portion 22 extending on the other side in the axial direction from the base cylindrical portion 20 and extending from the position of the bottom portion 14 to the side opposite to the protruding portion 13. Have. The axial length of the other end cylindrical portion 22 is longer than the axial length of the one end cylindrical portion 21.

基筒部２０は、外周面２０Ａが一定径の円筒面状をなしている。他端筒部２２は、外周面２２Ａおよび内周面２２Ｂがそれぞれ一定径の円筒面状をなしている。つまり、他端筒部２２は円筒状をなしている。基筒部２０の外周面２０Ａおよび他端筒部２２の外周面２２Ａは、同軸同径となっており、軸方向に連続している。   The base tube portion 20 has a cylindrical surface shape with an outer peripheral surface 20A having a constant diameter. The other end cylindrical portion 22 has an outer peripheral surface 22A and an inner peripheral surface 22B each having a cylindrical surface shape with a constant diameter. That is, the other end cylindrical portion 22 has a cylindrical shape. The outer peripheral surface 20A of the base tube portion 20 and the outer peripheral surface 22A of the other end tube portion 22 have the same coaxial diameter and are continuous in the axial direction.

一端筒部２１は、全体として先細のテーパ筒状をなしている。一端筒部２１は、外周面２１Ａが突出部１３から離れるほど小径となるテーパ面状をなしており、大径側において基筒部２０の外周面２０Ａに繋がっている。また、一端筒部２１の内周面２１Ｂは、突出部１３側の端部が、図２に示すように一定径の円筒面状のストレート部２１Ｂａとなっており、ストレート部２１Ｂａの突出部１３とは反対側が突出部１３から離れるほど径方向内側に位置するテーパ状の傾斜部２１Ｂｂとなっている。一端筒部２１の基筒部２０とは反対側の先端部には、外周側に円弧状のＲ面取り２１Ｃが形成されている。傾斜部２１Ｂｂの軸直交面とのなす角度は、例えば８０°に設定されている。   The one-end cylindrical portion 21 has a tapered tapered cylindrical shape as a whole. The one-end cylindrical portion 21 has a tapered surface shape having a smaller diameter as the outer peripheral surface 21A is separated from the protruding portion 13, and is connected to the outer peripheral surface 20A of the base cylindrical portion 20 on the larger diameter side. Moreover, as for the internal peripheral surface 21B of the one end cylinder part 21, the edge part by the side of the protrusion part 13 becomes the straight part 21Ba of cylindrical surface shape of a fixed diameter as shown in FIG. 2, and the protrusion part 13 of straight part 21Ba. The taper-shaped inclined portion 21Bb is located on the radially inner side as the side opposite to the protruding portion 13 becomes farther away. An arc-shaped R chamfer 21 </ b> C is formed on the outer peripheral side of the tip end portion of the one end tube portion 21 opposite to the base tube portion 20. The angle formed with the axis orthogonal plane of the inclined portion 21Bb is set to 80 °, for example.

外筒部１２の外周面１２Ａは、一端筒部２１の外周面２１Ａ、基筒部２０の外周面２０Ａおよび他端筒部２２の外周面２２Ａからなっている。外筒部１２の内周面１２Ｂは、一端筒部２１の内周面２１Ｂおよび他端筒部２２の内周面２２Ｂからなっている。   The outer peripheral surface 12 </ b> A of the outer cylinder portion 12 is composed of an outer peripheral surface 21 </ b> A of the one end cylindrical portion 21, an outer peripheral surface 20 </ b> A of the base cylindrical portion 20, and an outer peripheral surface 22 </ b> A of the other end cylindrical portion 22. The inner peripheral surface 12 </ b> B of the outer cylindrical portion 12 is composed of an inner peripheral surface 21 </ b> B of the one end cylindrical portion 21 and an inner peripheral surface 22 </ b> B of the other end cylindrical portion 22.

突出部１３は、この外筒部１２の内周面１２Ｂから全周にわたって突出しており、円環状をなしている。突出部１３の内周面１３Ａは円筒面状をなしており、突出部１３の底部１４とは反対側の端面１３Ｂは平坦面状をなしている。   The protruding portion 13 protrudes from the inner peripheral surface 12B of the outer cylinder portion 12 over the entire circumference and forms an annular shape. 13 A of inner peripheral surfaces of the protrusion part 13 are carrying out the cylindrical surface shape, and the end surface 13B on the opposite side to the bottom part 14 of the protrusion part 13 has comprised flat surface shape.

底部１４は、外筒部１２の内周面１２Ｂから全周にわたって延出しており、円環状をなしている。底部１４は、外筒部１２の軸方向中間位置から突出部１３に対し軸方向の一端筒部２１とは反対側にて突出部１３よりも径方向内側に延出している。これら突出部１３および底部１４は軸方向に繋がっており、全体として外筒部１２の軸方向の中央位置よりも一側（一端筒部２１側）に偏って形成されている。底部１４の突出部１３側の端面１４Ａは突出部１３の端面１３Ｂと平行な平坦面状をなしており、底部１４の突出部１３とは反対側の端面１４Ｂは、内周側がテーパ状の面取り１４Ｂａとされ、中間部から外周側が突出部１３の端面１３Ｂと平行な平坦面部１４Ｂｂとなっている。底部１４には、突出部１３よりも径方向の内側位置に、軸方向に貫通する貫通孔２４が円周方向に間隔をあけて複数（例えば４カ所）形成されている。   The bottom portion 14 extends from the inner circumferential surface 12B of the outer cylinder portion 12 over the entire circumference, and forms an annular shape. The bottom portion 14 extends radially inward from the protruding portion 13 on the side opposite to the one end cylindrical portion 21 in the axial direction with respect to the protruding portion 13 from the intermediate position in the axial direction of the outer cylindrical portion 12. The protruding portion 13 and the bottom portion 14 are connected in the axial direction, and are formed so as to be biased to one side (one end cylindrical portion 21 side) from the axial center position of the outer cylindrical portion 12 as a whole. The end surface 14A of the bottom portion 14 on the projecting portion 13 side has a flat surface shape parallel to the end surface 13B of the projecting portion 13, and the end surface 14B opposite to the projecting portion 13 of the bottom portion 14 has a chamfered inner peripheral side. The outer peripheral side from the intermediate portion is a flat surface portion 14Bb parallel to the end surface 13B of the protruding portion 13. A plurality of (for example, four) through-holes 24 penetrating in the axial direction are formed in the bottom portion 14 at an inner position in the radial direction with respect to the protruding portion 13 at intervals in the circumferential direction.

内筒部１５は、外周部が全周にわたって底部１４の内周部に繋がっており、底部１４から軸方向の一端筒部２１側に延出している。内筒部１５は、外周面１５Ａおよび内周面１５Ｂがそれぞれ一定径の円筒面状をなしている。つまり、内筒部１５は円筒状をなしている。突出部１３の内周面１３Ａと、底部１４の端面１４Ａと、内筒部１５の外周面１５Ａとで、マスキング部材１０には円環状をなして突出部１３の端面１３Ｂよりも軸方向に凹む凹部２５が形成されている。この凹部２５の底位置に上記した貫通孔２４が形成されている。   The inner cylinder portion 15 has an outer peripheral portion connected to the inner peripheral portion of the bottom portion 14 over the entire circumference, and extends from the bottom portion 14 to the one end cylindrical portion 21 side in the axial direction. The inner cylinder portion 15 has an outer peripheral surface 15A and an inner peripheral surface 15B each having a cylindrical surface shape with a constant diameter. That is, the inner cylinder portion 15 has a cylindrical shape. The inner peripheral surface 13A of the protruding portion 13, the end surface 14A of the bottom portion 14, and the outer peripheral surface 15A of the inner cylindrical portion 15 form an annular shape in the masking member 10 and are recessed in the axial direction from the end surface 13B of the protruding portion 13. A recess 25 is formed. The through hole 24 described above is formed at the bottom position of the recess 25.

マスキング部材１０は、絶縁材料からなっており、具体的には耐熱性および耐薬品性の高いシリコン樹脂製となっている。マスキング部材１０は、射出成形等によって上記形状に一体成形されている。なお、マスキング部材１０の材料としては、硬度５０°〜７０°のシリコン樹脂を採用でき、この硬度の範囲内で、形状や作業性等により適宜の硬度を選択できる。他の材料としては、フッ素系樹脂であるバイトン（登録商標）を用いることも可能であるが、コスト増となり、また表面に塗料の残存が生じてしまって繰り返し使用が困難になってしまう。よって、低コストであり、塗料をはじき水洗で除去可能となるシリコン樹脂を採用するのが好ましい。   The masking member 10 is made of an insulating material, and is specifically made of a silicon resin having high heat resistance and chemical resistance. The masking member 10 is integrally formed in the above shape by injection molding or the like. In addition, as a material of the masking member 10, a silicon resin having a hardness of 50 ° to 70 ° can be adopted, and an appropriate hardness can be selected within the hardness range depending on the shape, workability, and the like. As another material, Viton (registered trademark), which is a fluorine-based resin, can be used. However, the cost increases, and paint remains on the surface, which makes it difficult to use repeatedly. Therefore, it is preferable to employ a silicon resin that is low in cost and can be removed by repelling and washing the paint.

上記したマスキング部材１０は、図３に示すようにシリンダ３０に装着されてシリンダ３０のマスキングを行うものである。シリンダ３０は、金属部品であり、円筒状の胴部３１と、この胴部３１の軸方向一端側を閉塞させる底部３２とを有し、胴部３１の底部３２とは反対側が開口部３３とされた有底筒状をなしている。開口部３３は外周面３３Ａおよび内周面３３Ｂがそれぞれ一定径の円筒面をなしており、端面３３Ｃが外周面３３Ａおよび内周面３３Ｂに直交する平坦面となっている。そして、マスキング部材１０は、このシリンダ３０の開口部３３に装着される。   The above-described masking member 10 is mounted on the cylinder 30 as shown in FIG. The cylinder 30 is a metal part, and has a cylindrical body portion 31 and a bottom portion 32 that closes one axial end side of the body portion 31, and the opening portion 33 is opposite to the bottom portion 32 of the body portion 31. It has a bottomed cylindrical shape. In the opening 33, the outer peripheral surface 33A and the inner peripheral surface 33B each form a cylindrical surface having a constant diameter, and the end surface 33C is a flat surface orthogonal to the outer peripheral surface 33A and the inner peripheral surface 33B. The masking member 10 is attached to the opening 33 of the cylinder 30.

マスキング部材１０は、外筒部１２の一端筒部２１の内側にシリンダ３０の開口部３３が嵌合されることでこの開口部３３に装着されることになるが、シリンダ３０への装着前の一端筒部２１の最大内径つまり図１に示すストレート部２１Ｂａの径が、図３に示すシリンダ３０の開口部３３の外径つまり開口部３３の外周面３３Ａの径よりも締め代分小径となっている。よって、マスキング部材１０は、シリンダ３０の開口部３３に装着された状態では、一端筒部２１の内周面２１Ｂの全体が開口部３３の外周面３３Ａに倣って変形し外周面３３Ａに密着して外周面３３Ａを覆うことになる。このように一端筒部２１が開口部３３の外周面３３Ａを被覆すると、シリンダ３０内は、マスキング部材１０の外筒部１２の他端筒部２２の開口部２６のみを介して外部に連通することになる。   The masking member 10 is attached to the opening 33 by fitting the opening 33 of the cylinder 30 inside the one end cylinder 21 of the outer cylinder 12. The maximum inner diameter of the one-end cylindrical portion 21, that is, the diameter of the straight portion 21Ba shown in FIG. 1, is smaller than the outer diameter of the opening 33 of the cylinder 30, that is, the diameter of the outer peripheral surface 33A of the opening 33 shown in FIG. ing. Therefore, when the masking member 10 is attached to the opening 33 of the cylinder 30, the entire inner peripheral surface 21B of the one-end cylindrical portion 21 is deformed following the outer peripheral surface 33A of the opening 33 and is in close contact with the outer peripheral surface 33A. Thus, the outer peripheral surface 33A is covered. When the one end cylindrical portion 21 covers the outer peripheral surface 33A of the opening 33 in this way, the inside of the cylinder 30 communicates with the outside only through the opening 26 of the other end cylindrical portion 22 of the outer cylindrical portion 12 of the masking member 10. It will be.

つまり、マスキング部材１０は、シリンダ３０の開口部３３への装着状態で、外筒部１２の軸方向一側の一端筒部２１が開口部３３の外周面３３Ａを覆う。また、この装着状態で、マスキング部材１０は、突出部１３の端面１３Ｂが開口部３３の端面３３Ｃに当接して密着する。これにより、開口部３３の外周面３３Ａおよび端面３３Ｃを含むシリンダ３０の外面３０Ａのうち、外周面３３Ａと端面３３Ｃとを除く部分が外部に露出する。この部分が塗装により塗膜が形成される施工面３０Ａａとなる。   That is, the masking member 10 is attached to the opening 33 of the cylinder 30, and the one end cylindrical portion 21 on one side in the axial direction of the outer cylindrical portion 12 covers the outer peripheral surface 33 </ b> A of the opening 33. In this mounted state, the masking member 10 is in close contact with the end surface 13B of the protruding portion 13 in contact with the end surface 33C of the opening 33. As a result, of the outer surface 30A of the cylinder 30 including the outer peripheral surface 33A and the end surface 33C of the opening 33, a portion excluding the outer peripheral surface 33A and the end surface 33C is exposed to the outside. This part becomes the construction surface 30Aa on which a coating film is formed by painting.

また、この装着状態で、マスキング部材１０は、底部１４がシリンダ３０から軸方向に離間することになり、よって、凹部２５がシリンダ３０の開口部３３の端面３３Ｃから軸方向に離れるように凹む。加えて、マスキング部材１０は、開口部３３の内周面３３Ｂを含むシリンダ３０の内面３０Ｂから離れた位置に内筒部１５が位置する。   Further, in this mounted state, the masking member 10 is recessed such that the bottom portion 14 is separated from the cylinder 30 in the axial direction, so that the recess 25 is separated from the end surface 33 </ b> C of the opening 33 of the cylinder 30 in the axial direction. In addition, in the masking member 10, the inner cylinder portion 15 is located at a position away from the inner surface 30 </ b> B of the cylinder 30 including the inner peripheral surface 33 </ b> B of the opening 33.

シリンダ３０には、塗装工程の前処理として、上記のように開口部３３にマスキング部材１０が予め装着される。そして、この状態で、洗浄が行われ、アルカリ液により脱脂が行われる。その後、再び洗浄が行われる。   As described above, the masking member 10 is mounted on the cylinder 30 in advance in the opening 33 as a pretreatment for the painting process. In this state, cleaning is performed, and degreasing is performed with an alkaline solution. Thereafter, cleaning is performed again.

そして、塗装工程では、図４（ａ）に示す複数の通電棒４０を有する治具４１に、上記の前処理が行われたシリンダ３０が、図４（ｂ）に示すように、マスキング部材１０が装着された状態のままセットされる。このとき、治具４１は、複数の通電棒４０を鉛直上方に向け延出させており、シリンダ３０は、図３に示すように、その開口部３３を下向きにした状態、つまり装着されたマスキング部材１０の他端筒部２２の開口部２６を下向きにした状態で、マスキング部材１０の内筒部１５内に、図３に二点鎖線で示すように、通電棒４０を下から挿入させ、この通電棒４０の先端を上部に位置する底部３２に当接させる。このようにして一つのシリンダ３０が一本の通電棒４０に支持される。   Then, in the painting process, the cylinder 30 that has been subjected to the above-described pretreatment on the jig 41 having the plurality of current-carrying rods 40 shown in FIG. 4A is replaced with the masking member 10 as shown in FIG. Is set while is attached. At this time, the jig 41 extends a plurality of current-carrying bars 40 upward in the vertical direction, and the cylinder 30 has a state in which the opening 33 faces downward as shown in FIG. With the opening 26 of the other end cylindrical portion 22 of the member 10 facing downward, the energizing rod 40 is inserted from below into the inner cylindrical portion 15 of the masking member 10 as shown by a two-dot chain line in FIG. The front end of the current-carrying rod 40 is brought into contact with the bottom 32 located at the top. In this way, one cylinder 30 is supported by one energizing rod 40.

上記のように治具４１にセットされた状態のシリンダ３０が、図４（ｃ）に示すように、治具４１とともに塗料槽４５内の電着塗料４６に、上端の底部１４が浸かるまで浸漬される。このとき、シリンダ３０は、その外面３０Ａについては、マスキング部材１０から露出する施工面３０Ａａのみが電着塗料４６に接触する。また、シリンダ３０は、その内側の空間が、図３に示すように、下端に位置するマスキング部材１０の他端筒部２２の下向きの開口部２６のみを介して外部に連通しているため、電着塗料４６は、シリンダ３０内およびマスキング部材１０内にある空気により内部への浸入が阻止され、シリンダ３０の姿勢変動等により例え浸入したとしても、基本的にはマスキング部材１０の他端筒部２２内に収まる。   The cylinder 30 set in the jig 41 as described above is immersed in the electrodeposition paint 46 in the paint tank 45 together with the jig 41 until the bottom 14 at the upper end is immersed, as shown in FIG. Is done. At this time, as for the outer surface 30 </ b> A of the cylinder 30, only the construction surface 30 </ b> Aa exposed from the masking member 10 contacts the electrodeposition paint 46. Further, since the inner space of the cylinder 30 communicates with the outside only through the downward opening 26 of the other end cylindrical portion 22 of the masking member 10 located at the lower end, as shown in FIG. Even if the electrodeposition paint 46 is prevented from entering the inside by the air in the cylinder 30 and the masking member 10 and enters due to a change in the posture of the cylinder 30 or the like, basically, the other end cylinder of the masking member 10 is used. It fits in the part 22.

なお、電着塗料としては、例えば、顔料としてのパワーニックス２００Ｆ１（日本ペイント株式会社製）と、樹脂としてのパワーニックスＦ２（日本ペイント株式会社製）とを３：１の比率で混合し、これらと溶剤とを合わせたものが２０％の濃度となるように、純水で希釈したものを用いる。   As the electrodeposition paint, for example, Power Nix 200F1 (made by Nippon Paint Co., Ltd.) as a pigment and Power Nix F2 (made by Nihon Paint Co., Ltd.) as a resin are mixed at a ratio of 3: 1. A solution diluted with pure water is used so that the total concentration of the solvent and the solvent is 20%.

上記の状態で、治具４１を介してシリンダ３０に通電を行ってカチオン電着塗装を行う。すると、電着塗料４６に接触しているシリンダ３０の施工面３０Ａａのみに塗膜が形成される。   In the above state, the cylinder 30 is energized through the jig 41 to perform cationic electrodeposition coating. Then, a coating film is formed only on the construction surface 30 </ b> Aa of the cylinder 30 that is in contact with the electrodeposition paint 46.

次に、シリンダ３０は、治具４１とともに塗料槽４５内の電着塗料４６から取り出されることになり、図４（ｄ）に示すように、治具４１に支持された状態のままマスキング部材１０が取り外される。つまり、マスキング部材１０は、通電棒４０を図３に示す内筒部１５内で移動させながら、シリンダ３０から下方に取り外される。このとき、マスキング部材１０は、図４（ｄ）に示すように、シリンダ３０から離れるものの通電棒４０で支持された状態が維持される。   Next, the cylinder 30 is taken out from the electrodeposition paint 46 in the paint tank 45 together with the jig 41, and the masking member 10 remains supported by the jig 41 as shown in FIG. Is removed. That is, the masking member 10 is removed downward from the cylinder 30 while moving the current-carrying rod 40 within the inner cylinder portion 15 shown in FIG. At this time, as shown in FIG. 4D, the masking member 10 is maintained in a state where it is supported by the current-carrying rod 40 although it is away from the cylinder 30.

その後、治具４１とともにシリンダ３０およびマスキング部材１０が洗浄され、洗浄後に、図４（ｅ）に示すように、シリンダ３０が治具４１から取り外され、さらに、図４（ａ）に示すように、マスキング部材１０も治具４１から取り外される。シリンダ３０は、その後、乾燥炉で焼き付け乾燥処理が行われる。これにより、シリンダ３０は、図３に示す施工面３０Ａａのみが塗膜が形成された塗装面となり、開口部３３の内周面３３Ｂを含む内面３０Ｂと開口部３３の外周面３３Ａおよび端面３３Ｃとが、塗膜が形成されない非塗装面になる。   Thereafter, the cylinder 30 and the masking member 10 are cleaned together with the jig 41. After the cleaning, the cylinder 30 is removed from the jig 41 as shown in FIG. 4 (e), and further, as shown in FIG. 4 (a). The masking member 10 is also removed from the jig 41. Thereafter, the cylinder 30 is baked and dried in a drying furnace. Thereby, only the construction surface 30Aa shown in FIG. 3 becomes a coating surface on which the coating film is formed, and the cylinder 30 includes the inner surface 30B including the inner peripheral surface 33B of the opening 33, the outer peripheral surface 33A and the end surface 33C of the opening 33. However, it becomes a non-coating surface where a coating film is not formed.

上記のようにして塗装されたシリンダは、図５に示すように、シリンダ装置としての緩衝器５１を構成する。   The cylinder painted as described above constitutes a shock absorber 51 as a cylinder device, as shown in FIG.

緩衝器５１は、有底筒状の上記したシリンダ３０と、このシリンダ３０内に配置される無底筒状のシリンダ５２と、シリンダ３０，５２から一部突出するようにシリンダ５２内に挿入されるロッド５５と、このロッド５５に取り付けられシリンダ５２内に摺動可能に挿入されてシリンダ５２内を二つの室５６，５７に区画するピストン５８とを有している。シリンダ３０，５２間はリザーバ室５９となっており、シリンダ５２内には作動流体としての油液が封入され、リザーバ室５９には作動流体としての油液および高圧ガスが封入される。   The shock absorber 51 is inserted into the cylinder 52 so as to partly protrude from the cylinders 30, 52, the bottomed cylindrical cylinder 30, the bottomless cylindrical cylinder 52 disposed in the cylinder 30, and the cylinder 30. And a piston 58 attached to the rod 55 and slidably inserted into the cylinder 52 to divide the cylinder 52 into two chambers 56 and 57. A reservoir chamber 59 is provided between the cylinders 30 and 52, and an oil liquid as a working fluid is sealed in the cylinder 52, and an oil liquid and a high-pressure gas as a working fluid are sealed in the reservoir chamber 59.

緩衝器５１は、シリンダ３０，５２におけるロッド５５の突出側の端部位置に配置されるロッドガイド６１およびオイルシール６２と、シリンダ３０の底部１４側に配置されるベースバルブ６３とを有している。ロッドガイド６１はロッド５５の軸方向移動を案内し、オイルシール６２はロッド５５の軸方向移動を許容しつつシリンダ５２内の油液およびリザーバ室５９内の高圧ガスおよび油液が外部に漏出するのを規制する。   The shock absorber 51 has a rod guide 61 and an oil seal 62 disposed at the end position on the projecting side of the rod 55 in the cylinders 30 and 52, and a base valve 63 disposed on the bottom 14 side of the cylinder 30. Yes. The rod guide 61 guides the axial movement of the rod 55, and the oil seal 62 allows the oil liquid in the cylinder 52 and the high-pressure gas and oil liquid in the reservoir chamber 59 to leak outside while allowing the rod 55 to move in the axial direction. To regulate.

シリンダ３０は、上記したように、円筒状の胴部３１と、この胴部３１におけるロッド５５の突出側とは反対の一端側を閉塞させる底部３２とを有する有底筒状をなしている。そして、シリンダ３０は、上記した塗装後に、塗装されていない開口部３３が径方向内方に折り曲げ加工されることにより径方向内方に突出する係止部６５が形成されている。シリンダ５２は、円筒状をなしており、軸方向の一端側がシリンダ３０の底部１４の内側に配置されたベースバルブ６３に嵌合状態で支持され、軸方向の他端側がシリンダ３０の開口部３３の内側に嵌合されるロッドガイド６１に嵌合状態で支持されている。   As described above, the cylinder 30 has a bottomed cylindrical shape having the cylindrical body portion 31 and the bottom portion 32 that closes one end side of the body portion 31 opposite to the protruding side of the rod 55. The cylinder 30 is formed with a locking portion 65 projecting radially inward by bending the unpainted opening 33 radially inward after the above-described coating. The cylinder 52 has a cylindrical shape, and one end side in the axial direction is supported in a fitted state on a base valve 63 disposed inside the bottom portion 14 of the cylinder 30, and the other end side in the axial direction is the opening 33 of the cylinder 30. Is supported in a fitted state by a rod guide 61 fitted inside.

ベースバルブ６３は、室５７とリザーバ室５９とを連通可能な油通路７１，７２と、内側の油通路７１を開閉可能な縮み側減衰バルブとしてのディスクバルブ７３と、外側の油通路７２を開閉可能なチェックバルブとしてのディスクバルブ７４とを有している。ピストン５８には、室５６，５７を連通可能な油通路７６，７７と、外側の油通路７６を開閉可能な縮み側減衰バルブであるディスクバルブ７８と、内側の油通路７７を開閉可能な伸び側減衰バルブとしてのディスクバルブ７９とが設けられている。   The base valve 63 opens and closes oil passages 71 and 72 that allow the chamber 57 and the reservoir chamber 59 to communicate with each other, a disk valve 73 that serves as a compression-side damping valve that can open and close the inner oil passage 71, and an outer oil passage 72. And a disc valve 74 as a possible check valve. The piston 58 includes oil passages 76 and 77 that can communicate with the chambers 56 and 57, a disk valve 78 that is a compression-side damping valve that can open and close the outer oil passage 76, and an extension that can open and close the inner oil passage 77. A disk valve 79 is provided as a side damping valve.

ロッドガイド６１は、軸方向一側に大径外径部８１が形成され、軸方向他側に大径外径部８１よりも小径の小径外径部８２が形成された外形形状をなしており、大径外径部８１においてシリンダ３０の胴部３１の内周部に嵌合し、小径外径部８２においてシリンダ５２の内周部に嵌合する。オイルシール６２は、ゴム材からなるシール部８５と、シール部８５内に埋設されオイルシール６２の形状を維持し、固定のための強度を得るための金属製の円環状の環状部材８６とを有している。オイルシール６２は、環状部材８６の位置がロッドガイド６１とシリンダ３０の加締められた係止部６５とに挟持される。   The rod guide 61 has an outer shape in which a large-diameter outer diameter portion 81 is formed on one side in the axial direction and a small-diameter outer diameter portion 82 having a smaller diameter than the large-diameter outer diameter portion 81 is formed on the other side in the axial direction. The large diameter outer diameter portion 81 is fitted to the inner peripheral portion of the body portion 31 of the cylinder 30, and the small diameter outer diameter portion 82 is fitted to the inner peripheral portion of the cylinder 52. The oil seal 62 includes a seal portion 85 made of a rubber material, and a metal annular ring member 86 embedded in the seal portion 85 to maintain the shape of the oil seal 62 and obtain strength for fixing. Have. The oil seal 62 is sandwiched between the rod guide 61 and the locking portion 65 where the cylinder 30 is crimped at the position of the annular member 86.

つまり、電着塗装後のシリンダ３０内に、開口部３３から、ベースバルブ６３、シリンダ５２、ピストン５８およびロッド５５が挿入されることになり、さらに、ロッドガイド６１がシリンダ３０の胴部３１およびシリンダ５２に嵌合させられ、オイルシール６２がシリンダ３０の胴部３１に嵌合させられる。この状態で、シリンダ３０の塗装が施されていない開口部３３が径方向内側に折り曲げ加工されて係止部６５が形成されると、係止部６５がオイルシール６２をロッドガイド６１とで挟持する。   That is, the base valve 63, the cylinder 52, the piston 58, and the rod 55 are inserted into the cylinder 30 after electrodeposition coating from the opening 33, and the rod guide 61 is further connected to the body 31 of the cylinder 30. The oil seal 62 is fitted into the cylinder 31 of the cylinder 30. In this state, when the opening 33 in which the cylinder 30 is not coated is bent radially inward to form the locking portion 65, the locking portion 65 holds the oil seal 62 between the rod guide 61. To do.

以上に述べた第１実施形態のマスキング部材１０によれば、シリンダ３０の開口部３３に装着された状態では、外筒部１２の軸方向一側の一端筒部２１が開口部３３の外周面３３Ａを覆うことになるため、外周面３３Ａを良好にマスキングすることができる。また、電着塗装時には、シリンダ３０が開口部３３を下向きにした倒立状態で電着塗料４６に浸漬させられることになり、その際に、マスキング部材１０は通電棒４０を貫通させる必要があって、シリンダ３０の内面３０Ｂをマスキングすることはできないが、底部１４よりもシリンダ３０とは反対側に他端筒部２２が延出することになるため、他端筒部２２内の空間によって内面３０Ｂおよび開口部３３の端面３３Ｃへの塗料付着を防止することができる。したがって、シリンダ３０の開口部３３の外周面３３Ａおよび端面３３Ｃと内面３０Ｂとを良好に非塗装面にすることができる。   According to the masking member 10 of the first embodiment described above, the one end cylinder portion 21 on the one axial side of the outer cylinder portion 12 is the outer peripheral surface of the opening portion 33 when mounted on the opening portion 33 of the cylinder 30. Since 33A is covered, the outer peripheral surface 33A can be masked satisfactorily. Further, at the time of electrodeposition coating, the cylinder 30 is immersed in the electrodeposition paint 46 in an inverted state with the opening 33 facing downward, and at that time, the masking member 10 needs to penetrate the current-carrying rod 40. The inner surface 30B of the cylinder 30 cannot be masked, but the other end cylindrical portion 22 extends to the opposite side of the cylinder 30 from the bottom portion 14, and therefore the inner surface 30B is formed by the space in the other end cylindrical portion 22. In addition, it is possible to prevent the paint from adhering to the end face 33C of the opening 33. Therefore, the outer peripheral surface 33A, the end surface 33C, and the inner surface 30B of the opening 33 of the cylinder 30 can be satisfactorily made non-painted surfaces.

また、外筒部１２の軸方向中間位置から突出部１３に対し軸方向の一端筒部２１とは反対側にて突出部１３よりも径方向内側に延出する底部１４と、底部１４の径方向内側から軸方向に延出する内筒部１５とを有するため、シリンダ３０から離れる方向に凹む凹部２５が形成されることになる。したがって、例えば通電棒４０に付着した塗料が通電棒４０からマスキング部材１０の内筒部１５の外側に多少流れることがあったとしても、凹部２５に留めておくことができる。よって、シリンダ３０の内面３０Ｂおよび開口部３３の端面３３Ｃに塗料が付着することをさらに防止することができる。   Further, a bottom portion 14 extending radially inward from the projecting portion 13 on the side opposite to the one end tubular portion 21 in the axial direction with respect to the projecting portion 13 from an intermediate position in the axial direction of the outer cylinder portion 12, and a diameter of the bottom portion 14 Since it has the inner cylinder part 15 extended in an axial direction from a direction inner side, the recessed part 25 dented in the direction away from the cylinder 30 will be formed. Therefore, for example, even if the paint adhering to the current-carrying rod 40 flows slightly from the current-carrying rod 40 to the outside of the inner cylinder portion 15 of the masking member 10, it can be retained in the recess 25. Therefore, it is possible to further prevent the paint from adhering to the inner surface 30B of the cylinder 30 and the end surface 33C of the opening 33.

また、内筒部１５が設けられていることにより、通電棒４０との径方向距離を小さくでき、シリンダ３０の倒れを抑制することができる。したがって、電着塗装時にシリンダ３０が傾くことよってマスキング部材１０内に浸入する塗料の量を抑制することができる。なお、図６に示すように、内筒部１５を外筒部１２の一端筒部２１よりも、さらに軸方向外側に延出させることも可能であり、このようにすれば、内筒部１５の長さが長くなるため、より一層、シリンダ３０の倒れを抑制することができる。よって、図６に示すように、他端筒部２２の軸方向長さを一端筒部２１と同等まで短くすることも可能になる。   Further, since the inner cylinder portion 15 is provided, the radial distance from the current-carrying rod 40 can be reduced, and the cylinder 30 can be prevented from falling. Therefore, the amount of paint that enters the masking member 10 by tilting the cylinder 30 during electrodeposition coating can be suppressed. As shown in FIG. 6, it is possible to extend the inner cylinder portion 15 further outward in the axial direction than the one end cylinder portion 21 of the outer cylinder portion 12, and in this way, the inner cylinder portion 15. Therefore, the cylinder 30 can be further prevented from falling. Therefore, as shown in FIG. 6, the axial length of the other end cylindrical portion 22 can be shortened to the same extent as the one end cylindrical portion 21.

また、一端筒部２１の内周面２１Ｂが、軸方向の突出部１３側が一定径のストレート部２１Ｂａとなり、ストレート部２１Ｂａの突出部１３とは反対側が突出部１３から離れるほど径方向内側に位置する傾斜部２１Ｂｂとなっているため、一端筒部２１の柔軟性が増すことになり、シリンダ３０への装着性を向上できる。また、一端筒部２１の基端部の応力集中を抑制できるため、寿命が向上する。なお、図７に示すように、一端筒部２１の内周面２１Ｂの全体を傾斜させることも可能であり、このようにすれば、形状が簡素となるため、製造コストを低減することができる。   Further, the inner peripheral surface 21B of the one-end cylindrical part 21 is a straight part 21Ba having a constant diameter on the side of the protruding part 13 in the axial direction, and is positioned radially inward as the opposite side of the protruding part 13 of the straight part 21Ba is away from the protruding part 13. Therefore, the flexibility of the one-end cylindrical portion 21 is increased, and the mounting property to the cylinder 30 can be improved. Moreover, since the stress concentration of the base end part of the one end cylinder part 21 can be suppressed, a lifetime improves. In addition, as shown in FIG. 7, it is also possible to incline the whole inner peripheral surface 21B of the one end cylinder part 21, and if it does in this way, since a shape becomes simple, manufacturing cost can be reduced. .

一端筒部２１の基筒部２０とは反対側の先端部の内周側に円筒面状のストレート部を形成しても良い。このようにすれば、一端筒部２１を先端部までシリンダ３０の開口部３３の外周面３３Ａに密着させることができる。したがって、一端筒部２１の先端部とシリンダ３０との間に塗料が溜まりにくくなり、部分的に塗膜が厚くなることを抑制できる。なお、図８に示すように、一端筒部２１の先端部を外周側から内周側までＲ面取り２１Ｃとすることも可能であり、このようにすれば、形状が簡素となるため、製造コストを低減することができる。   A cylindrical straight portion may be formed on the inner peripheral side of the distal end portion of the one-end cylindrical portion 21 opposite to the base cylindrical portion 20. If it does in this way, the one end cylinder part 21 can be stuck to the outer peripheral surface 33A of the opening part 33 of the cylinder 30 to a front-end | tip part. Therefore, it is difficult for paint to accumulate between the tip of the one-end cylindrical portion 21 and the cylinder 30, and it is possible to suppress a partial increase in the coating film. In addition, as shown in FIG. 8, it is also possible to make the front-end | tip part of the one end cylinder part 21 into R chamfer 21C from an outer peripheral side to an inner peripheral side, and in this way, since a shape becomes simple, manufacturing cost Can be reduced.

また、底部１４には、軸方向に貫通する貫通孔２４が形成されているため、上記のように凹部２５に溜まった塗料を貫通孔２４から落下させて排出することができ、脱脂時に凹部２５に溜まったアルカリ液を貫通孔２４から落下させて排出することができる。なお、図８に示すように、底部１４の貫通孔２４をなくすことも可能であり、このようにすれば、形状が簡素となるため、製造コストを低減することができる。   Further, since the through hole 24 penetrating in the axial direction is formed in the bottom portion 14, the paint accumulated in the concave portion 25 can be dropped and discharged from the through hole 24 as described above, and the concave portion 25 can be discharged during degreasing. The alkaline liquid accumulated in the liquid can be dropped from the through hole 24 and discharged. In addition, as shown in FIG. 8, it is also possible to eliminate the through-hole 24 of the bottom part 14, and if it does in this way, since a shape becomes simple, manufacturing cost can be reduced.

また、シリンダ３０を嵌合させる一端筒部２１に対し底部３２から延出する他端筒部２２の方が軸方向長さが長いため、塗料への浸漬時にシリンダ３０が傾くことで塗料が入り込む部分の容量を増大させることができる。したがって、シリンダ３０の内面３０Ｂおよび開口部３３の端面３３Ｃへの塗料の付着を抑制することができる。なお、図９に示すように、一端筒部２１と他端筒部２２との軸方向長さを同等にすることも可能であり、このようにすれば、小型になるため、製造コストを低減することができる。   Further, since the other end cylinder portion 22 extending from the bottom portion 32 is longer in the axial direction than the one end cylinder portion 21 into which the cylinder 30 is fitted, the paint enters when the cylinder 30 is inclined when immersed in the paint. The capacity of the part can be increased. Therefore, the adhesion of the paint to the inner surface 30B of the cylinder 30 and the end surface 33C of the opening 33 can be suppressed. In addition, as shown in FIG. 9, it is also possible to make the axial direction length of the one end cylinder part 21 and the other end cylinder part 22 equal, and since it will become small in this way, manufacturing cost will be reduced. can do.

また、シリンダ３０は、電着塗装後に開口部３３が折り曲げ加工されるものであるため、マスキング部材１０で開口部３３を良好に非塗装面とすることにより、折り曲げ加工で塗料が剥がれることがなく、剥がれた塗料が緩衝器５１の内部にコンタミネーションとして混入してしまうことを抑制できる。   Further, since the opening portion 33 of the cylinder 30 is bent after electrodeposition coating, the coating material is not peeled off by bending the masking member 10 so that the opening portion 33 is made a good non-coating surface. Thus, it is possible to prevent the peeled paint from entering the buffer 51 as contamination.

以上に述べた本実施形態は、有底筒状のシリンダを開口部を下向きにして電着塗装する際に前記開口部に装着されるマスキング部材であって、軸方向一側が前記開口部の外周面を覆う被覆部とされた外筒部と、前記外筒部の軸方向中間位置から径方向内側に突出して前記開口部の端面に当接する突出部と、前記外筒部の軸方向中間位置から前記突出部に対し軸方向の前記被覆部とは反対側にて前記突出部よりも径方向内側に延出する底部と、前記底部の径方向内側から軸方向に延出する内筒部と、を有することを特徴とする。これにより、マスキング部材は、シリンダの開口部に装着された状態では、外筒部の軸方向一側の被覆部が開口部の外周面を覆うことになるため、この外周面を良好にマスキングすることができる。また、電着塗装時には、シリンダが開口部を下向きにした状態で電着塗料に浸漬させられることになり、その際に、マスキング部材は通電棒を貫通させる必要があって、シリンダの内面をマスキングすることはできないが、外筒部は底部よりもシリンダとは反対側にも延出することになるため、この部分の空間によってシリンダの内面への塗料付着を防止することができる。   The present embodiment described above is a masking member that is attached to the opening when the bottomed cylindrical cylinder is electrodeposition coated with the opening facing downward, and one side in the axial direction is the outer periphery of the opening. An outer cylindrical portion that is a covering portion that covers the surface, a protruding portion that protrudes radially inward from an axial intermediate position of the outer cylindrical portion, and abuts against an end surface of the opening, and an axial intermediate position of the outer cylindrical portion A bottom portion extending radially inward from the protrusion on the opposite side of the covering portion in the axial direction from the protrusion, and an inner cylinder portion extending in the axial direction from the radially inner side of the bottom portion It is characterized by having. Thereby, when the masking member is attached to the opening portion of the cylinder, the covering portion on one side in the axial direction of the outer cylinder portion covers the outer peripheral surface of the opening portion, so that the outer peripheral surface is well masked. be able to. Also, during electrodeposition coating, the cylinder is immersed in the electrodeposition paint with the opening facing downward. At that time, the masking member needs to penetrate the current-carrying rod and mask the inner surface of the cylinder. However, since the outer cylinder portion extends to the opposite side of the cylinder from the bottom portion, the space of this portion can prevent the paint from adhering to the inner surface of the cylinder.

また、前記被覆部の内周面は、軸方向の前記突出部側が一定径のストレート部とされ、該ストレート部の前記突出部とは反対側が前記突出部から離れるほど径方向内側に位置する傾斜部とされていることを特徴とする。これにより、被覆部の柔軟性が増すことになり、シリンダへの装着性を向上できる。また、被覆部の基端部の応力集中を抑制できるため、寿命が向上する。   Further, the inner peripheral surface of the covering portion is inclined such that the protruding portion side in the axial direction is a straight portion having a constant diameter, and the side opposite to the protruding portion of the straight portion is located radially inward as the distance from the protruding portion increases. It is characterized by being part. Thereby, the softness | flexibility of a coating | coated part will increase and the mounting property to a cylinder can be improved. Moreover, since the stress concentration at the base end portion of the covering portion can be suppressed, the life is improved.

また、前記底部には、軸方向に貫通する貫通孔が形成されていることを特徴とする。これにより、何らかの理由で底部に塗料が溜まることがあっても、溜まった塗料を貫通孔から落下させて排出することができる。   In addition, a through hole penetrating in the axial direction is formed in the bottom portion. Thereby, even if a coating material collects in a bottom part for some reason, the stored coating material can be dropped and discharged | emitted from a through-hole.

また、前記シリンダは、電着塗装後に前記開口部が折り曲げ加工されるものであることを特徴とする。これにより、マスキング部材でシリンダの開口部を良好に非塗装面とすることにより、折り曲げ加工で塗料が剥がれることがなく、剥がれた塗料がシリンダ内でコンタミネーションとして混入してしまうことを抑制できる。   Further, the cylinder is characterized in that the opening is bent after electrodeposition coating. Thereby, by making the opening part of a cylinder into a non-coating surface satisfactorily with a masking member, it is possible to prevent the paint from being peeled off by bending and mixing the peeled paint as a contamination in the cylinder.

また、本実施形態は、前記マスキング部材を前記開口部に装着して電着塗装するシリンダの製造方法であって、前記開口部に前記マスキング部材を装着する装着工程と、通電棒に対し前記シリンダの前記開口部を下向きにし、底部が当接するように前記通電棒に支持させる支持工程と、電着塗装槽内に前記底部が浸かるまで浸漬させる電着塗装工程と、からなる。   In addition, the present embodiment is a method of manufacturing a cylinder in which the masking member is attached to the opening to perform electrodeposition coating, the mounting step of attaching the masking member to the opening, and the cylinder with respect to the current-carrying rod The opening portion is directed downward, and the supporting rod is supported by the current-carrying rod so that the bottom portion comes into contact, and the electrodeposition coating step is performed so that the bottom portion is immersed in the electrodeposition coating tank.

１０ マスキング部材
１２ 外筒部
１３ 突出部
１４ 底部
１５ 内筒部
２１ 一端筒部（被覆部）
２１Ｂ 内周面
２１Ｂａ ストレート部
２１Ｂｂ 傾斜部
２４ 貫通孔
３０ シリンダ
３３ 開口部
３３Ａ 外周面
３３Ｃ 端面 DESCRIPTION OF SYMBOLS 10 Masking member 12 Outer cylinder part 13 Projection part 14 Bottom part 15 Inner cylinder part 21 One end cylinder part (covering part)
21B Inner peripheral surface 21Ba Straight portion 21Bb Inclined portion 24 Through hole 30 Cylinder 33 Opening portion 33A Outer peripheral surface 33C End surface

Claims (5)

有底筒状のシリンダを開口部を下向きにして電着塗装する際に前記開口部に装着されるマスキング部材であって、
軸方向一側が前記開口部の外周面を覆う被覆部とされた外筒部と、
前記外筒部の軸方向中間位置から径方向内側に突出して前記開口部の端面に当接する突出部と、
前記外筒部の軸方向中間位置から前記突出部に対し軸方向の前記被覆部とは反対側にて前記突出部よりも径方向内側に延出する底部と、
前記底部の径方向内側から軸方向に延出する内筒部と、を有することを特徴とするマスキング部材。 A masking member attached to the opening when the bottomed cylindrical cylinder is electrodeposition coated with the opening facing downward,
An outer cylindrical portion whose one axial side is a covering portion that covers the outer peripheral surface of the opening;
A protruding portion that protrudes radially inward from an axially intermediate position of the outer cylinder portion and contacts an end surface of the opening;
A bottom portion extending radially inward from the protruding portion on the opposite side of the covering portion in the axial direction from the axial intermediate position of the outer cylinder portion;
A masking member comprising: an inner cylinder portion extending in an axial direction from a radially inner side of the bottom portion. 前記被覆部の内周面は、軸方向の前記突出部側が一定径のストレート部とされ、該ストレート部の前記突出部とは反対側が前記突出部から離れるほど径方向内側に位置する傾斜部とされていることを特徴とする請求項１記載のマスキング部材。   The inner peripheral surface of the covering portion is a straight portion having a constant diameter on the side of the protruding portion in the axial direction, and an inclined portion positioned on the radially inner side as the side opposite to the protruding portion of the straight portion is separated from the protruding portion. The masking member according to claim 1, wherein the masking member is formed. 前記底部には、軸方向に貫通する貫通孔が形成されていることを特徴とする請求項１または２記載のマスキング部材。   The masking member according to claim 1, wherein a through-hole penetrating in the axial direction is formed in the bottom portion. 前記シリンダは、電着塗装後に前記開口部が折り曲げ加工されるものであることを特徴とする請求項１乃至３のいずれか一項記載のマスキング部材。   The masking member according to any one of claims 1 to 3, wherein the cylinder is formed by bending the opening after electrodeposition coating. 請求項１乃至４のいずれか一項記載のマスキング部材を前記開口部に装着して電着塗装するシリンダの製造方法であって、
前記開口部に前記マスキング部材を装着する装着工程と、
通電棒に対し前記シリンダの前記開口部を下向きにし、前記シリンダの底部が当接するように前記通電棒に支持させる支持工程と、
電着塗装槽内に前記シリンダの底部が浸かるまで浸漬させる電着塗装工程と、
からなるシリンダの製造方法。 A method of manufacturing a cylinder, wherein the masking member according to any one of claims 1 to 4 is attached to the opening and is electrodeposited.
A mounting step of mounting the masking member on the opening;
A supporting step of supporting the current-carrying rod so that the opening of the cylinder faces downward with respect to the current-carrying rod and the bottom of the cylinder abuts;
An electrodeposition coating step in which the bottom of the cylinder is immersed in an electrodeposition coating tank;
The manufacturing method of the cylinder which consists of.
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