JP2606764B2 - Method of manufacturing male member used for connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector for connecting a hose or a pipe for transferring a fluid such as water or air.

[0002]

2. Description of the Related Art Conventionally, as a connector, as shown in FIG. 13, a male member 100 having an enlarged insertion end portion 101 and an unexpanded main body portion 102 behind the insertion end portion 101.
And a nut member 20 having a receiving opening 201 into which the insertion end portion 101 of the male member 100 is inserted and a seal inner peripheral surface 202.
And a cylindrical female member 200 to which a third screw portion 204 is screwed (US Patent 413356).
No. 4). A ring-shaped engagement groove 205 is formed in a boundary area between the nut member 203 and the female member 200. A ring seal 105 is fitted into the seal groove 104 on the outer peripheral surface of the insertion end 101, and a C-shaped lock ring 108 is fitted into a ring-shaped engagement groove 107 on the outer peripheral surface of the insertion end 101. Then, the insertion end 10 of the male member 100
When the first member 1 is inserted through the receiving opening 201 of the female member 200, the ring seal 105 comes into close contact with the seal inner peripheral surface 202, and the lock ring 108 engages with the engagement groove 205. Concatenate.

As another connector, as shown in FIG.
Male member 300 having an insertion end 301 formed at the distal end
And a female female member 400 having a receiving opening 401 into which the insertion end portion 301 of the male member 300 is inserted, a seal inner peripheral surface 402, and a seal groove 403. 3871691). The outer diameter of the insertion end 301 is substantially the same over the entire length. In this connector, an engagement groove 302 formed on the outer peripheral surface of the insertion end 301 is provided.
, A C-shaped lock ring 303 is fitted therein, and a ring seal 404 is fitted in the seal groove 403 of the female member 400. Then, the insertion end 30 of the male member 300
1 is inserted through the receiving opening 401 of the female member 400, the male member 300 and the female member 400 are sealed with the ring seal 404, and the nut member 408 is screwed into the screw hole 406 of the female member 400. Tip and locking wall 4
07 prevents the lock ring 303 from coming off, thereby connecting the male member 300 and the female member 400.

[0004]

In the connector shown in FIG. 13, inwardly protruding portions 110 and 111 are formed on the peripheral wall of the insertion end 101 of the male member 100 to form the seal groove 104 and the engagement groove 107. Have been. Inward projection 11
0 and 111 have the disadvantage that the flow area of the male member 100 is reduced. In particular, when the inner diameter of the male member 100 itself is small, the reduction of the flow channel area by the inwardly protruding portions 110 and 111 is very disadvantageous. In the connector shown in FIG. 13, the insertion end portion 101 of the male member 100 is enlarged in diameter in order to cope with the decrease in the flow path area. But Figure 1
In the connector shown in FIG. 3, the insertion end portion 101 has no conical outer peripheral surface.

[0005] In the connector shown in FIG.
Since the engagement groove 302 is formed on the outer peripheral surface of the insertion end 301 of the insertion end 301, the inner peripheral surface of the insertion end 301 that faces away from the engagement groove 302 projects inward, and the inward projection 304 It is formed. Therefore, as described above, the inwardly protruding portion 304 brings about a disadvantage that the flow path area is reduced. Therefore, it is disadvantageous in securing the flow area of the male member 1.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a ring-shaped seal groove or an engagement groove which contributes to a reduction in the flow path area by inserting a male member. despite formed on the outer peripheral surface of the end portion is to provide a manufacturing method of the male member to be used advantageously connector to secure the flow path area of the male member.

[0007]

[0008]

SUMMARY OF THE INVENTION A method of manufacturing a male member used in a connector according to the present invention comprises using a thin metal cylindrical pipe having the same inner diameter and outer diameter over the entire length and having the same uniform thickness. A diameter expansion process of expanding the peripheral wall of the portion over the entire circumference to obtain a secondary cylindrical pipe having a straight cylindrical enlarged diameter cylindrical portion having an inner diameter and an outer diameter larger than other peripheral wall portions;
The diameter of the expanded cylindrical portion of the secondary cylindrical pipe is reduced by squeezing the peripheral wall at the end portion, and the outer diameter is smaller than the outer diameter of the expanded cylindrical portion and larger than the outer diameter of the original cylindrical pipe. A diameter cylindrical portion, a straight cylindrical unreduced diameter cylindrical portion having a peripheral wall that is not narrowed out of the expanded diameter cylindrical portion, and an unreduced diameter cylinder interposed between the reduced diameter cylindrical portion and the unreduced diameter cylindrical portion. Drawing step to obtain a tertiary cylindrical pipe having a conical outer peripheral surface and a conical cylindrical portion having a conical inner peripheral surface whose outer diameter decreases in a conical shape from the portion toward the reduced diameter cylindrical portion; Using a rolling roll having three ring projections, with the mandrel inserted into the tertiary cylindrical pipe, the ring projection of the rolling roll is addressed to the outer peripheral surface of the tertiary cylindrical pipe. The outer peripheral surface of the reduced-diameter cylindrical portion of the cylindrical pipe and the outer peripheral surface of the non-reduced-diameter cylindrical portion are plastically deformed so that the outer peripheral surface of the reduced-diameter cylindrical portion and the outer peripheral surface of the unreduced-diameter cylindrical portion are deformed. A rolling step of rolling each ring-shaped groove is performed in order, and a ring-shaped groove formed on the outer peripheral surface of the reduced-diameter cylindrical portion is sealed by a seal ring that seals a boundary with a female member of the connector. A ring-shaped holding member which is used as a seal groove to be attached and which engages with a ring-shaped groove formed on an outer peripheral surface of an unreduced diameter cylindrical portion with an inner peripheral surface portion of a female member of the connector. A male member is formed as an engaging groove into which the groove is fitted. According to the method for manufacturing a male member used for a connector according to claim 2, the method according to claim 1 is provided.
In the rolling step, ring-shaped grooves are simultaneously formed on the outer peripheral surface of the reduced-diameter cylindrical portion and the outer peripheral surface of the non-reduced-diameter cylindrical portion.

[0009]

In the male member of the connector according to the present invention, the outside of the reduced diameter cylindrical portion is provided.
A ring-shaped groove formed on the peripheral surface is covered with a seal ring.
As well as the outer peripheral surface of the unreduced diameter cylindrical part.
The formed ring-shaped groove engages with the inner peripheral surface of the female member
An engagement groove into which the ring-shaped holding member fits.

In the method for manufacturing a male member according to the present invention, a diameter increasing step of forming a diameter-enlarged cylindrical portion by enlarging the end of a cylindrical pipe is performed, and then a drawing step of narrowing the distal end of the diameter-enlarged cylindrical portion is performed. Accordingly, the conical cylindrical portion having the conical outer peripheral surface having the function of elastically displacing the holding member is easily manufactured. Construct male member
Expanded and reduced diameters of cylindrical pipes
Enhancement by minute work hardening is expected.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the connector according to the present invention will be described with reference to the drawings. In this quick connector, the male member 1 is formed by plastically processing a commercially available cylindrical pipe made of an aluminum-based alloy, and has an insertion end 10 and a main body behind the insertion end 10. And 11.

The male member 1 will be described with reference to FIGS. The insertion end portion 10 of the male member 1 includes a straight cylindrical medium-diameter cylindrical portion 12, a conical cylindrical portion 13, and a straight cylindrical large-diameter cylindrical portion 14 from the tip of the insertion end portion 10. The medium-diameter cylindrical portion 12 is formed parallel to the axis P of the male member 1. Medium diameter cylinder 12
A medium-diameter inner peripheral surface 12a having an inner diameter B2 larger than the inner diameter A0 of the main body 11 of the male member 1, a medium-diameter outer peripheral surface 12b having an outer diameter C2 larger than the outer diameter A of the main body 11; It has two seal grooves 12c formed coaxially on the radial outer peripheral surface 12b and extending in a ring shape, and a rubber seal ring 12d attached to the seal grooves 12c. The peripheral wall portion forming the seal groove 12c protrudes inward, and the ring-shaped inward protruding portion 1 is formed.
2e.

The conical cylindrical portion 13 is coaxially connected to the rear of the intermediate diameter cylindrical portion 12. The conical cylindrical portion 13 has a conical inner peripheral surface 13a whose inner diameter increases in a conical shape as the distance from the tip of the male member 1 increases, and a conical outer peripheral surface 1a whose outer diameter increases in a conical shape.
3b. The large-diameter cylindrical portion 14 is provided behind the conical cylindrical portion 13 in parallel with the axis P. The large-diameter cylindrical portion 14 has a large-diameter outer peripheral surface 1 having an outer diameter D larger than the outer diameter C of the medium-diameter cylindrical portion 12.
4a, a second large-diameter outer peripheral surface 14b having an outer diameter F larger than the outer diameter C2 of the medium-diameter cylindrical portion 12, a large-diameter outer peripheral surface 14a, and a second large-diameter outer peripheral surface 14a.
A ring-shaped engaging groove 14c formed coaxially in a boundary area with the large-diameter outer peripheral surface 14b;
And a large-diameter inner peripheral surface 14e having a larger inner diameter E2. The peripheral wall portion forming the engagement groove 14c protrudes inward,
It is a ring-shaped inward protruding portion 14f.

Next, the female member 2 will be described with reference to FIG. The female member 2 is made of an aluminum-based alloy and has a receiving opening 20 into which the insertion end 10 of the male member 1 is inserted, a front inner peripheral surface 21 defining the receiving opening 20, and a front inner peripheral surface 21.
, A receiving hole 23 communicating with the receiving opening 20, and a seal inner peripheral surface 24 defining the receiving hole 23. 8 and 11, the front inner peripheral surface 2 of the female member 2
1, a ring-shaped holding groove 25 is formed. A regulating groove 27 is formed adjacent to the holding groove 25. The restriction groove 27 has an inner diameter M2 smaller than the inner diameter M1 of the groove bottom surface 25a of the holding groove 25, and has a ring-shaped restriction parallel surface 27a parallel to the axis P in a boundary region with the holding groove 25.

Further, as shown in FIG. 1 and FIG.
Is provided with a lock ring 26 having a circular cross section which can be expanded and reduced in diameter and made of a spring wire as a holding member. The overall shape of the lock ring 26 is substantially C-shaped.
A protrusion 26a formed at one end of the lock ring 26 is locked by a pin hole-shaped locking hole 2i of the female member 2, and an operation protrusion 26b formed at the other end of the lock ring 26 is formed by a slit of the female member 2. It is locked by the locking hole 2k of the shape. Next, a method for manufacturing the male member 1 will be described. First, in the diameter expanding step, the inner diameter A0 (8.4 mm) and the outer diameter A as shown in FIG.
(12.0 mm) is the same and has a uniform thickness t (t = 1.8 mm) over its entire length.
Is used. Then, as shown in FIG. 4, an enlarged die 42 having a die surface 41 that partitions the die hole 40 and a punch die 48 having a ring-shaped shoulder 47 and a small-diameter portion 49 are used. With the cylindrical pipe W arranged, the punch mold 48 is inserted into the cylindrical pipe W in the direction of arrow T1, and the peripheral wall at the distal end of the cylindrical pipe W is subjected to diameter expansion processing over the entire circumference. Obtains a secondary cylindrical pipe W2 having a cylindrical enlarged-diameter cylindrical portion 70 larger than other peripheral wall portions. Here, in FIG. 4, the inner diameter B of the enlarged-diameter tube portion 70 is 12.2 m.
m and the outer diameter C are 15.8 mm.

Next, a drawing step is performed. In the drawing process,
As shown in FIG. 5, a reducing die 52 having a die surface 51 defining a die hole 50 is used to reduce the diameter of the secondary cylindrical pipe W2 by narrowing the peripheral wall at the tip end portion of the enlarged cylindrical portion 70. Thereby, the reduced diameter cylindrical portion 73 whose outer diameter is smaller than the outer diameter of the enlarged diameter cylindrical portion 70, the non-reduced diameter cylindrical portion 74 of the enlarged diameter cylindrical portion 70 which is not narrowed, and the reduced diameter cylindrical portion 74. Part 73 and non-reduced diameter cylindrical part 74
A tertiary cylindrical pipe W3 having a conical outer peripheral surface 75 whose outer diameter increases in a conical shape from the reduced diameter cylindrical portion 73 toward the non-reduced diameter cylindrical portion 74 is obtained. In this case, the conical outer peripheral surface 75 is naturally formed by the drawing process. here,
In FIG. 5, the inner diameter B1 of the reduced-diameter cylindrical portion 73 is 10.6 mm, which is larger than the inner diameter A0 of the main body 11.
The outer diameter C1 of the reduced-diameter cylindrical portion 73 is 14.0 mm, which is larger than the outer diameter A of the main body 11.

Next, a rolling process is performed. In the rolling process,
As shown in FIG. 7, a plurality of ring projections 80, 8 are provided on the outer peripheral surface.
A set of three roll rolls 83 having 1, 82 and a mandrel 85 are used. In a state where the mandrel 85 is inserted into the tertiary cylindrical pipe W3, the central part of the set of three rolling rolls 83 is placed in parallel with the axis of the rolling roll
The next cylindrical pipe W3 is arranged. In this state, the rolling roll die 83 is driven to rotate, and thereby the ring projections 80 and 8 are rotated.
1, 82 are directed to the outer peripheral surface of the tertiary cylindrical pipe W3. As a result, ring grooves are formed by rolling on the outer peripheral surface of the reduced diameter cylindrical portion 73 and the outer peripheral surface of the unreduced diameter cylindrical portion 74, respectively. Thereby, the medium-diameter cylindrical portion 12 having the seal groove 12c and the engagement groove 14c
The insertion end portion 10 having the large-diameter cylindrical portion 14 having Here, FIG. 6 shows a state after rolling. In FIG. 6, the inner diameter B2 of the middle-diameter cylindrical portion 12 is 10.6 mm,
The value is substantially the same as the inner diameter B1 before rolling. The outer diameter C2 of the middle-diameter cylindrical portion 12 is 14.0 mm, which is substantially the same as the outer diameter C1 before rolling. Further, FIG.
, The inner diameter of the large-diameter inner peripheral surface 14e of the large-diameter cylindrical portion 14 is E
2, the outer diameter of the second large-diameter outer peripheral surface 14b is indicated by F. The outer diameter C of the large-diameter outer peripheral surface 14a is 15.8 m.
m, which is the same as before rolling.

Next, the operation of connecting the male member 1 and the female member 2 will be described. As shown in FIG. 8, the male member 1 faces the receiving opening 20 of the female member 2 in a state where the seal groove 12c is provided with the seal ring 12d, and in this state, the male member 1 and the female member 2 are aligned in the axial direction. Relative movement and fitting. At this time, the substantially C-shaped lock ring 26 expands radially outward, that is, in the direction of the arrow Y1 while abutting on the conical outer peripheral surface 13b of the conical cylindrical portion 13. Thereafter, as shown in FIG. 9, when the lock ring 26 having the increased diameter reaches the engagement groove 14c, the lock ring 26
Is reduced in diameter by its own resilience and naturally fits into the engagement groove 14c, and is temporarily held. In this state, as shown in FIG.
Large diameter outer peripheral surface 14a of large diameter cylindrical portion 14 of male member 1 and female member 2
Is fitted with the front inner peripheral surface 21 that defines the receiving opening 20 of
Further, the conical outer peripheral surface 13b of the conical cylindrical portion 13 of the male member 1 and the conical inner peripheral surface 22 of the female member 2 are fitted with each other. The inner peripheral surface 24 of the member 2 is fitted. In this state, the rubber ring seal 12d is crushed as shown in FIG.
The space between the middle diameter outer peripheral surface 12b and the seal inner peripheral surface 24 of the female member 2 is sealed in a liquid-tight manner.

In the state shown in FIG. 9, when the fluid flows through the hose connected to the female member 2 and the male member 1, the female member 2 and the male member 1 are relatively displaced in the axial direction away from each other by the fluid pressure. 10 and FIG.
As shown in FIG. 2, with the relative displacement, the outer peripheral end of the lock ring 26 temporarily held in the engagement groove 14c is
7 is covered and locked by the groove bottom surface 27b. Therefore, the diameter increase of the lock ring 26 in the direction perpendicular to the axis is reliably suppressed by the groove bottom surface 27b of the restriction groove 27. Moreover, in this embodiment, as shown in FIG. 12, the regulating groove 27 has a ring-shaped regulating parallel surface 27a.
Since “a” is parallel to the axis P of the female member 2, a distance can be secured with respect to the displacement of the lock ring 26 in the direction in which the lock ring 26 is released, and the release of the lock ring 26 can be further suppressed.

When the male member 1 is separated from the female member 2, the male member 1 and the female member 2 are relatively moved in the axial direction so that the holding groove 25 is located on the outer peripheral side of the lock ring 26. Let it. Then, the operation protruding portion 26b of the lock ring 26 shown in FIG. 2 is enlarged in the direction of arrow S1 (see FIG. 2) to enlarge the lock ring 26 and remove it from the engagement groove 14c. The female member 2 is relatively moved in a direction away from each other.

When the seal groove 12c and the engagement groove 14c are formed on the outer peripheral surface of the insertion end portion 10 of the male member 1, as shown in FIG. Of the peripheral wall to be formed, the peripheral wall portion on the back side of the seal groove 12c and the engagement groove 14c
The peripheral wall portion on the back side protrudes inward to form an inwardly protruding portion 12e,
14f is formed. Therefore, the insertion end 10
May be reduced. In this regard, according to the connector of the present embodiment, the seal groove 12c is formed in the middle diameter cylindrical portion 12 having an outer diameter larger than the main body portion 11 of the male member 1, and the engagement groove 14c is formed in the main body portion of the male member 1. Since it is formed in the large-diameter cylindrical portion 14 having an outer diameter larger than that of the intermediate-diameter cylindrical portion 11 and the medium-diameter cylindrical portion 12, inward protruding portions 12e and 14f which tend to reduce the flow area of the insertion end portion 10 are formed. Nevertheless, the flow path area of the insertion end 10 can be secured.

Further, according to the method of manufacturing the male member 1 according to the present embodiment, the insertion end portion 1 having the seal groove 12c and the engagement groove 14c on the outer peripheral surface and capable of securing a large flow area.
0 can be easily manufactured into the male member 1. Further, according to the method for manufacturing the male member 1 according to the present embodiment, after performing the diameter expanding step of expanding the distal end of the cylindrical pipe W to form the enlarged diameter cylindrical portion 70, the distal end portion of the enlarged diameter cylindrical portion 70 is performed. Since the squeezing step for reducing only the diameter is performed, the conical cylindrical portion 13 having the conical outer peripheral surface 13b serving to expand the diameter of the lock ring 26 can be formed into the medium-diameter cylindrical portion 12 and the large-diameter cylindrical portion 14 without cutting. Can be easily manufactured between In particular, the formation of the seal groove 12c and the engagement groove 14c does not require cutting, which tends to increase the cost, which is advantageous for cost reduction.

Further, according to the method for manufacturing the male member 1 according to the present embodiment, the diameter of the cylindrical pipe W is increased by increasing the diameter of the cylindrical pipe W.
After performing the diameter-enlarging step to form the insertion end portion 10, the squeezing step of narrowing only the distal end portion of the diameter-enlarging cylindrical portion 70 is performed, and the insertion end portion 10 is formed. An increase in the strength of the insertion end 10 can also be expected.

[0024]

According to the male member <br/> connector prepared in the present invention method, circle seal groove seal ring fitting is large diametrically-reduced cylinder portion outer diameter than the outer diameter of the body portion of the male member Formed in
Further, since the engagement groove into which the holding member engaged with the female member is fitted is formed in the non-reduced diameter cylindrical portion having an outer diameter larger than the main body of the male member, the seal groove and the engagement groove are formed in the radial direction. Outside
Position, so that it is not
This is advantageous for locating the radial protrusion outward in the radial direction.
This is advantageous for securing the flow area of the insertion end of the male member.

According to the method of manufacturing a male member according to the present invention, it is possible to easily manufacture an insertion end having a seal groove and an engagement groove on the outer peripheral surface and capable of securing a flow path area. In addition
According to the method for manufacturing a male member according to the present invention, the diameter expansion processing and the contraction
Because diameter processing is performed, strengthening by work hardening can be expected.
The seal wall and the engagement groove are provided while suppressing the thickness of the peripheral wall.
This is advantageous for ensuring the strength of the peripheral wall portion. Further rolling
According to the description, there is substantially no streamline cut in the metal structure
Therefore, the peripheral wall portion having the seal groove and the engagement groove is strengthened.
It is even more advantageous. Further, according to the method of claim 2,
In the manufacturing process, the outer peripheral surface of the reduced diameter cylindrical portion and the outer
Since the ring-shaped groove is rolled simultaneously with the surface, productivity is improved.
You can plan on the top.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part in a state where a female member and a male member are connected to each other.

FIG. 2 is a front view of a female member.

FIG. 3 is a sectional view of a main part of a cylindrical pipe.

FIG. 4 is a cross-sectional view showing a diameter expanding step of obtaining a secondary cylindrical pipe having an enlarged diameter portion.

FIG. 5 is a cross-sectional view showing a drawing process for obtaining a tertiary cylindrical pipe.

FIG. 6 is a sectional view of an insertion end of a male member manufactured by performing a rolling process.

FIG. 7 is a cross-sectional view showing a state where a rolling process is being performed.

FIG. 8 is a sectional view of a main part immediately before inserting a male member into a female member.

FIG. 9 is a cross-sectional view of a main part in a state where the male member is temporarily held by a lock ring after being inserted into the female member.

FIG. 10 is a cross-sectional view of a main part in a state where the male member is inserted into the female member and locked by a lock ring.

FIG. 11 is an enlarged sectional view of a main part of FIG. 9;

FIG. 12 is an enlarged sectional view of a main part of FIG. 10;

FIG. 13 is a sectional view of a conventional connector.

FIG. 14 is a sectional view of a conventional connector.

[Explanation of symbols]

In the figure, 1 is a male member, 10 is an insertion end, 11 is a main body, 1
2 is a medium-diameter cylindrical portion, 12c is a seal groove, 13 is a conical cylindrical portion, 1
Reference numeral 4 denotes a large-diameter cylindrical portion, 14c denotes an engagement groove, 2 denotes a female member, 20 denotes a receiving opening, and 26 denotes a lock ring.

Claims (2)

(57) [Claims] 1. A metal-made thin cylindrical pipe having the same and uniform inner diameter and outer diameter over its entire length, and the peripheral wall at the tip end of the cylindrical pipe is expanded over the entire circumference. A diameter increasing step of obtaining a secondary cylindrical pipe having a straight cylindrical enlarged diameter cylindrical portion larger than the other peripheral wall portion; and reducing the diameter of the secondary cylindrical pipe by narrowing down the peripheral wall at the distal end portion of the enlarged diameter cylindrical portion. The outer diameter is smaller than the outer diameter of the enlarged-diameter tube portion and the diameter of the straight cylindrical reduced-diameter tube portion is larger than the outer diameter of the original cylindrical pipe, and the peripheral wall of the enlarged-diameter tube portion that is not narrowed. A non-reduced cylindrical portion having a straight cylindrical shape, and an outer diameter that is interposed between the reduced-diameter tubular portion and the unreduced cylindrical portion and has an outer diameter conical surface from the unreduced cylindrical portion toward the reduced-diameter tubular portion. A squeezing step for obtaining a tertiary cylindrical pipe having a conical outer peripheral surface and a conical cylindrical portion provided with a conical inner peripheral surface having a reduced diameter; In the state where a mandrel is inserted into the inside of the tertiary cylindrical pipe, the ring projection of the roll form is addressed to the outer peripheral surface of the tertiary cylindrical pipe, using a rolling roll having a projection. Plastically deforming the outer peripheral surface of the reduced diameter cylindrical portion and the outer peripheral surface of the unreduced diameter cylindrical portion of the tertiary cylindrical pipe,
Performed a rolling process of rolling the outer circumferential surface and the yet-outer peripheral surface and the respective ring-shaped groove in the reduced diameter cylindrical portion of the fused cylindrical portion, in this order, it is formed on the outer peripheral surface of the fused cylindrical portion The ring-shaped groove is used as a seal groove on which a seal ring for sealing a boundary between the connector and the female member is attached, and the ring-shaped groove formed on the outer peripheral surface of the unreduced-diameter cylindrical portion is connected to the connector. Forming a male member as an engagement groove into which a ring-shaped holding member engaged for connection with the inner peripheral surface portion of the female member is fitted. 2. The rolling step according to claim 1, wherein a ring-shaped groove is simultaneously rolled on the outer peripheral surface of the reduced diameter cylindrical portion and the outer peripheral surface of the unreduced diameter cylindrical portion. Manufacturing method of male member used for connector.