JP4640078B2 - Processing device for fluid pipe connection fitting and manufacturing method of fluid pipe connection fitting - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a device for manufacturing a fluid pipe connection fitting having a hose connection portion connected to a brake hose or the like of an automobile by cold forging, and a manufacturing method using the device.

  A connecting fitting for a fluid pipe connected to a brake hose of an automobile has a cylindrical socket and a nipple, which is a pipe having a smaller diameter than the socket, formed concentrically, and an inner peripheral wall of the socket and an outer peripheral wall of the nipple The hose is connected by inserting the hose into the hose insertion gap between them and caulking the socket from the outer periphery. As a method for producing such a fluid pipe connection fitting, there is known a technique of producing a fitting material by plastic working by cold forging (Patent Documents 1 and 2).

  In other words, in the conventional technology, a metal material for a metal fitting is set on a die, and in the first step, a die (punch) is pressed against one end surface of the metal material for the metal fitting, and a cylindrical nipple molding portion that becomes a nipple by backward extrusion is plastic processed. To do. In the second step, a cylindrical nipple is formed by pressing a punch along the central axis of the nipple forming portion and plastically processing an oil passage by backward extrusion. However, according to this method, since the processing resistance due to friction between the die or punch and the metal material for the metal fittings is large, the nipple forming part and the nipple elongation amount are not stabilized, and the nipple processing length of the final product is reduced. There was a problem that variations were likely to occur.

  In Patent Documents 1 and 2, only the tip of the punch for forming the oil passage is thickened to reduce the contact area with the metal fitting material, thereby processing the punch and the metal fitting material when processing the oil passage. Reducing the resistance has been done. However, even with such technology, the nipple molding part and the outer peripheral surface of the nipple are constantly in sliding contact with the die or punch, so the effect of reducing the frictional resistance with the metal fitting material is insufficient, and further reduction in processing resistance Is desired. In particular, when trying to form the oil passage of the nipple by cutting, it is necessary to plastically process the nipple molding part to the nipple processing length of the final product. Since the variation in the nipple processing length is likely to become larger, it is desired to reduce the processing resistance.

JP-A-11-123493 Japanese Patent Laid-Open No. 11-19747

  The present invention is based on solving the above-mentioned problems of the prior art, has a low processing resistance when cold forging a metal fitting material, is easy to mold, and has a molding accuracy such as nipple length and misalignment. It is an object of the present invention to provide a processing apparatus for a fluid pipe connection fitting that is less likely to cause variations, and a manufacturing method using the apparatus.

The present invention made to solve the above problems
A cylindrical socket and a tubular nipple having a smaller diameter than the socket are formed concentrically, and a hose connection portion having a hose insertion gap for inserting a hose between the inner peripheral wall of the socket and the outer peripheral wall of the nipple. In the processing equipment for the fluid pipe connection fittings provided,
A die for holding a metal fitting material for forming the hose connection part;
By abutting on the end of the metal fitting material held by the die and moving relative to the metal fitting material in the axial direction of the metal fitting material to push out the end of the metal fitting material. A punch for projecting an end of the material for the metal fitting to form a nipple molding part to be the nipple,
The punch has a punch outer periphery that forms an inner peripheral wall of the socket, and a punch hole that forms an outer peripheral wall of the nipple.
The punch hole introduces the end of the metal fitting material so as to form the nipple molding portion, and is connected to the introduction hole having the same inner diameter as the outer diameter of the nipple, and from the outer diameter of the nipple connected to the introduction hole. A relief hole having a large inner diameter, and a restriction hole connected to the relief hole and having the same inner diameter as the outer diameter of the nipple,
It is characterized by.

Another aspect of the present invention is a manufacturing method using a processing apparatus for a fluid pipe connection fitting,
A setting step of setting the metal fitting material on the die;
The punch introduction hole is applied to the end surface of the metal fitting material, and the punch is moved relative to the metal fitting material to form a nipple molding portion in the punch hole that is the same as the outer shape of the nipple. Molding process;
With
In the molding step, the nipple molding part has an outer diameter defined by the introduction hole at the tip of the nipple molding part, and advances to the back side of the punch hole without contacting the escape hole, and further the regulation hole It is formed so that it may advance while being positioned.

The fluid pipe connection fitting processing apparatus of the present invention forms the hose connection portion by cold forging the fitting material. In other words, the hose connection portion has a cylindrical socket and a nipple having a smaller diameter than the socket formed concentrically, and a hose insertion gap for inserting a hose is provided between the inner peripheral wall of the socket and the outer peripheral wall of the nipple. Form. In order to form such a hose connection part, a punch material is set on a die, a punch introduction hole is applied to the end face of the bracket material, and the punch is moved relative to the bracket material to thereby form a punch hole. This is done by forming a nipple molding part in which the end of the bracket material is advanced.
The punch hole is sequentially provided with an introduction hole, a relief hole, and a restriction hole toward the back of the hole, and the inside diameter of the punch hole is the same as the outside diameter of the nipple, and the relief hole is the nipple. It is formed larger than the outer diameter. Due to the relative movement of the bracket material and the punch, the nipple forming part has the same outer diameter as the nipple at the introduction hole of the punch hole, and advances to the back side of the punch hole without contact with the escape hole. Molded by advancing while being positioned. At this time, since the nipple forming part advances in the punch hole without contacting the wall surface of the escape hole, the machining resistance can be remarkably reduced. In addition, when the nipple molding part advances to the length of the nipple, the restriction hole restrains the tip part of the nipple molding part, thereby correcting the inclination of the nipple molding part and preventing misalignment.
In addition, since the restriction hole increases the processing resistance with the nipple molding part and regulates the extension amount of the nipple, it prevents excessive extension of the nipple molding part, the processing length of the nipple molding part, and finally the nipple molding part. The length error can be reduced.

  In order to further clarify the configuration and operation of the present invention described above, preferred embodiments of the present invention will be described below.

(1) Configuration of Fluid Pipe Connection Fitting FIG. 1 is a cross-sectional view showing a fluid pipe connection fitting manufactured by a fluid pipe connection fitting processing apparatus according to an embodiment of the present invention. FIG. It is sectional drawing which shows the state which connected the brake hose to the connection metal fitting for pipes. The fluid pipe connection fitting 10 is used in a brake system of an automobile, and includes a socket 12, a nipple 14, and a head 16 connected to one end of the socket 12 and the nipple 14. The end of the brake hose BH is inserted into the hose insertion gap 17 formed by the nipple 14 and the socket 12, and the brake hose BH is connected as shown in FIG. The brake hose BH and the mating pipe are connected by screwing the connection end of the mating pipe (not shown) into the connecting portion 16a of the section 16.

  The fluid conduit connecting fitting 10 is formed by processing each part of the nipple 14, the socket 12 and the head 16 from a single fitting material by a cold forging process and a cutting process. The socket 12 protrudes from the head 16 and has a cylindrical shape into which the end of the brake hose BH is inserted, has a length L1, and has an outer diameter d1. The nipple 14 protrudes from the head 16 concentrically with the socket 12, includes an oil passage 14 a that communicates with the connection portion 16 a of the head 16 along the axis thereof, has the same length L 1 as the socket 12, and It is formed as a thin pipe having an outer diameter d2 and an inner diameter d3. These dimensions are, for example, L1 = 18 mm, d1 = 14.7 mm, d2 = 3.5 mm, d3 = 2.3 mm.

(2) Manufacturing Process Next, a processing device for a fluid pipe connection fitting and a manufacturing method using the same will be described. In addition, although the following processes are mainly performed by the automatic press for cold forging, the illustration of the mold is omitted for simplicity.
FIG. 3 is an explanatory view for explaining a series of shapes of the metal fitting material until it is processed into the fluid conduit connecting metal fitting 10. First, a long wire is cut into a predetermined length to form a material. As wire rod, carbon steel wire for cold heading (SWCH8 or SWCH1
2) or an equivalent of these, and those that have been normally annealed and lubricated are used. Subsequently, by pressing a punch against the end face of the cut material and pressing it, both end faces are smoothed to form the metal fitting material 20 (FIG. 3A). Thereafter, the metal fitting material 21 in which the recesses 21a and 21b are processed by pressing is formed on both end faces of the metal fitting material 20 (FIG. 3B). Subsequently, a metal fitting material 22 is formed in which one end portion of the metal fitting material 21 is processed with an enlarged diameter portion 22a to be the head portion 16 and a recess 22b to be the connection portion 16a (FIG. 3C).

  Subsequently, the metal material 23 is formed by processing the hose insertion gap 17 and the nipple molding portion 23a to be the nipple 14 shown in FIG. FIG. 4 is an explanatory view for explaining a peripheral portion of a mold of a processing device for a fluid pipe connection fitting. The processing device 30 includes a die 31 for setting the metal material 22, a pressing device 32 that can move relative to the die 31, and a conveyance device 33 for conveying the metal material 22 to the die 31. I have. The die 31 is formed with a fixing portion 31a for setting the material 22 for metal fittings, and is further formed with a processing hole 31b provided continuously to the fixing portion 31a. A punch 34 is disposed in the processing hole 31b. FIG. 5 is an explanatory diagram enlarging the main part of FIG. The punch 34 has a cylindrical shape, and a gap 31c for forming the socket 12 is formed between the outer peripheral wall of the punch 34 and the inner peripheral wall of the processing hole 31b. A punch hole 35 is formed in the punch 34 along its axis. The punch hole 35 is a hole for forming a nipple molding portion 23a which becomes an outer peripheral wall of the nipple 14, and introduces an end portion of the fitting material 22 and has an introduction hole 35a having the same inner diameter d4 as the outer diameter d2 of the nipple 14. And a relief hole 35b connected to the introduction hole 35a and having an inner diameter d5 larger than the outer diameter d2 of the nipple 14, and a regulation hole 35c connected to the escape hole 35b and having the same inner diameter d6 as the outer diameter d2 of the nipple 14. ing.

  Returning to FIG. 4, the pressing device 32 includes a pressing pin 32a. The end of the pressing pin 32a enters the recess 22b of the metal fitting material 22 and restrains the enlarged diameter portion 22a, so that the end of the metal fitting material 22 is pushed into the punch hole 35 and the nipple molding portion 23a. It can be formed so that Further, the transport device 33 is a means for transporting the metal fitting material 22 to the opening of the fixing portion 31 a of the die 31.

The process by the processing apparatus 30 is as follows. First, the metal material 22 for metal fittings is conveyed to the opening of the fixing part 31a of the die 31 by the conveying device 33, and the metal material 22 for metal fittings is set on the fixing part 31a by moving the pressing device 32 toward the die 31 (FIG. 6). State). In this state, as shown in FIG. 7, by moving the pressing device 32 toward the die 31, the diameter expanding portion 22a of the metal fitting material 22 is restrained by the pressing pin 32a and the cylindrical restraining portion 32b. The socket 12 is formed by extruding the end portion of the metal fitting material 22 into the gap between the machining hole 31b and the outer peripheral surface of the punch 34, and at the same time, the nipple forming portion 23a is formed by extruding the punch hole 35. The
At this time, the nipple molding portion 23a is molded while the end portion of the metal fitting material 22 is extruded with the outer diameter being determined by the introduction hole 35a. However, as shown in FIG. 7, the tip portion of the nipple molding portion 23a is a relief hole. When advancing in 35b, there is little machining resistance because it does not contact the wall surface. Then, as shown in FIG. 8, when the tip of the nipple molding portion 23a reaches the restriction hole 35c, the nipple molding portion 23a advances while being positioned so that the axes coincide with each other. Thereby, the metal fitting material 23 shown in FIG. Then, as post-processing, the oil passage 14a is formed in the central axis of the metal member 23 of the metal member 23 by cutting, and further, a screw, a collar portion, and the like are formed, thereby forming the fluid line connecting metal fitting 10 in FIG. Is obtained.

(3) Operation and effect of embodiment The following operation and effect are exhibited by the above embodiment.
(3) -1 The escape hole 35b of the punch hole 35 advances into the punch hole 35 without bringing the tip of the metal fitting material 22 into contact with the wall surface of the punch hole 35, so that the machining resistance can be remarkably reduced. it can.
(3) -2 The restricting hole 35c of the punch hole 35 restrains the tip of the nipple forming portion 23a when it reaches, so that the inclination of the nipple forming portion 23a is corrected and the misalignment is prevented. That is, if the nipple molding part 23a is inclined, the thickness of the nipple 14 of the final product varies due to the cutting process of the oil passage 14a. Therefore, there is a problem that the nipple 14 is broken due to insufficient strength of the nipple 14. According to the embodiment, since the misalignment of the nipple molding portion 23a can be reliably prevented, the strength of the nipple 14 can be stabilized.
(3) -3 The regulation hole 35c rapidly increases the processing resistance with the tip of the metal fitting material 22 and regulates the amount of extension of the nipple molding part 23a. Therefore, there is a variation in dimensional accuracy that the nipple molding part 23a is too long. It does not occur, and the processing length of the nipple 14 can be stabilized.

It is sectional drawing which shows the connection fitting for fluid pipes manufactured by the processing apparatus of the connection fitting for fluid pipes concerning one Example of this invention. It is sectional drawing which shows the state which connected the brake hose to the connection fitting for fluid pipe lines. It is explanatory drawing explaining a series of shapes of the raw material for metal fittings by a manufacturing process. It is explanatory drawing explaining the peripheral part of the metal mold | die of a processing apparatus. It is explanatory drawing which expanded the principal part of FIG. It is explanatory drawing explaining a process. It is explanatory drawing explaining the process of following FIG. It is explanatory drawing explaining the process of following FIG.

Explanation of symbols

10 ... Connector for fluid conduit 12 ... Socket 14 ... Nipple 14a ... Oil passage 16 ... Head 16a ... Connector 20 ... Fitting material 21 ... Fitting Material 21a, 21b ... recess 22 ... metal fitting material 22a ... enlarged diameter part 22b ... recess 23 ... metal fitting material 23a ... nipple molding part 30 ... processing equipment 31 ... Die 31a ... Fixed part 31b ... Processing hole 31c ... Gap 32 ... Pressing device 32a ... Pressing pin 32b ... Cylinder restraint part 33 ... Conveying device 34 .. Punch 35 ... Punch hole 35a ... Introduction hole 35b ... Relief hole 35c ... Regulation hole BH ... Brake hose

Claims (2)

A cylindrical socket (12) and a tubular nipple (14) having a smaller diameter than the socket (12) are formed concentrically, and between the inner peripheral wall of the socket (12) and the outer peripheral wall of the nipple (14). In a processing apparatus for a fluid pipe connection fitting provided with a hose connection portion having a hose insertion gap (17) for inserting a hose,
A die (31) for holding a metal fitting material (22) for forming the hose connection part;
Abutting against the end of the metal fitting material (22) held by the die (31), the metal plate is moved relative to the metal fitting material (22) in the axial direction of the metal fitting material (22). A punch (34) for extruding the end of the metal fitting material (22) to project the end of the metal fitting material (22) to form a nipple molding part (23a) to be the nipple (14); With
The punch (34) has a punch outer peripheral portion forming an inner peripheral wall of the socket (12) and a punch hole (35) forming an outer peripheral wall of the nipple (14).
The punch hole (35) introduces an end of the metal fitting material (22) so as to form the nipple molding part (23a) and introduces an introduction hole (35a having the same inner diameter as the outer diameter of the nipple (14). ), An escape hole (35b) connected to the introduction hole (35a) and having an inner diameter larger than the outer diameter of the nipple (14), and an outer diameter of the nipple (14) connected to the escape hole (35b). A restriction hole (35c) having the same inner diameter;
An apparatus for processing a connection fitting for a fluid pipe. In the manufacturing method using the processing apparatus of the connection fitting for fluid pipes of Claim 1,
A setting step of setting the metal fitting material (22) on the die (31);
The punch (34) is brought into contact with the introduction hole (35a) on the end face of the metal fitting material (22), and the punch (34) is moved relative to the metal fitting material (22) to thereby produce the punch. A molding step for forming the same nipple molding part (23a) as the outer shape of the nipple (14) in the hole (35);
With
In the molding step, the nipple molding part (23a) is punched without the tip of the nipple molding part (23a) having an outer diameter determined by the introduction hole (35a) and contacting the escape hole (35b). Advancing to the back side of the hole (35), and being formed to advance while being positioned in the restriction hole (35c),
A method of manufacturing a fluid pipe connection fitting.

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