JPH01228632A - Integrated hose joint fitting and its manufacture - Google Patents

Abstract

PURPOSE:To improve the reliability and productivity of the joining strength of a shaft lever by integrally forming the mouthpiece part and pipe part of a hose joint fitting by extruding. CONSTITUTION:A bar blank W of smaller diameter than a mouthpiece part is prepd. by cutting and after forming a 1st pierced hole 5 by prepiercing this center part from the lower end face to a bit lower part of the center part, the 1st pierced hole 5 is formed similarly from the upper end face and pierced so as to connect the 1st pierced hole 5 extended from both end faces. This blank W is upset by pressurizing in the axial direction to form a flange part 3 on the circumference of the center part of the blank W. When a cylindrical mouthpiece part 1 is then subjected to backward extruding at the lower and upper extrusion stages using an extruding die on this blank, the pierced hole 5 of a pipe part 2 projecting to the center part of the mouthpiece part is contracted but not closed excepting the part surrounded by the flange part 3 and becomes an inductive hole 7. Drill piercing is then executed along the hole 7, 7 and a product is obtd. by working a 2nd pierced hole 8 having no eccentricity.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a one-piece hose joint fitting and a method of manufacturing the same.

(Prior art and its problems) Conventionally, a hose joint fitting for connecting a fluid counter-pressure hose was made by cutting a rod material and forming a collar part 3 as shown in Fig. 5.
After upsetting and forming, ■ and ■ both mouthpieces are formed by backward extrusion, and then ■ after drilling a hole in the center part 2a, ■ inserting the pipe 2 into the hole and joining (brazing). )
and connected. Therefore, not only does the bonding strength between the pipe material 2 and the hole 2a at the center of the cap lack reliability, but
Since the manufacturing process is complicated, there are problems in that productivity is low and product cost is high.

(Problems to be Solved) Therefore, the present invention aims to improve productivity by forming a pipe integrally with the base portion without joining the pipe materials, thereby improving the reliability of the joint strength of the shaft rod. With this in mind, as a result of extensive research, it was discovered that cold extrusion processing technology could be used to process wire or bar material.

(Means for Solving the Problems) Therefore, the present invention provides a base formed by backward extrusion in the axial direction of a rod material having a first hole in the center, and a base formed at the center of the base by the backward extrusion. A pipe part having a second perforation formed by drilling the first perforation along the remaining guide hole after the first perforation is deformed, and a base formed by axially pressurizing the rod material. The present invention provides an integrated hose joint fitting having a flange portion projecting from the outer periphery of the flange portion.

The structure of the present invention includes not only both side port joint fittings (
(see Fig. 1), and can also be applied to a one-sided hose joint fitting (see Fig. 2) having a joint 4 that does not form a cap.

According to the structure of the present invention, the pipe portion and the mouthpiece portion can be integrally molded by cold extrusion processing.

The present invention also provides a method for manufacturing the above-mentioned integrated hose joint fitting, the gist of which is a first drilling step in which a preliminary hole is made in the center of a rod material cut to have approximately the same volume as the product. (Fig. 1 ■ to ■) and the upsetting process (first
(Fig. ■) and a backward extrusion process (Fig. 1 ■ to ■) in which the bar material with pre-drilled holes is pressurized in the axial direction to form a cylindrical mouthpiece.
and a step of drilling a pipe portion formed at the center of the cylindrical mouthpiece by the extrusion step along a guide hole formed by deforming the preliminary hole located at the center (FIG. 1).

According to the method of the present invention, the mouthpiece portion and the pipe portion are integrally formed at the same time in a continuous cold working process. Furthermore, since the pipe portion is bored through the guide hole, the hole is accurately formed without eccentricity, and no undue burden is placed on the drilling tool. It should be noted that the upsetting step of pressurizing the rod material in the axial direction to form a flange around the rod material is preferably performed after preliminary drilling is performed, or the preliminary drilling may be performed after forming the flange. .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on manufacturing examples of a double-sided hose joint fitting shown in the accompanying drawings.

(Example) Fig. 1 ■ to ■ show the method of the present invention applied, and Fig.
This is a process explanatory diagram showing the steps of the mounting method for manufacturing the double-sided hose joint fitting J shown in the figure: ■ Cutting process, ■ Lower drilling process, ■ Upper drilling process, ■ Hole punching process, ■ Upsetting process,
The top pressing process, ■top pressing process, and ■hole drilling indicate the processes.

Specifically, in the cutting step (1), a rod-shaped material W is prepared by cutting a coil material having a smaller diameter than the mouthpiece into approximately the final product volume.

Next, in the lower drilling step (2), a first hole 5 is formed in the center of the bar W by pre-drilling from the lower end surface to slightly below the center. Similarly, in the upper drilling step, a first hole 5 is formed by pre-drilling the center of the bar W from the upper end surface to slightly above the center, and then a hole is punched so as to connect the first holes extending from both end surfaces. .

(2) This punched rod-shaped material W is swaged by applying pressure once in the axial direction to form a flange portion 3 around the center of the material W.

Next, the process moves to rear extrusion steps (1) and (2) in which the rod material having the collar portion 3 with preliminary holes is pressurized in the axial direction to form the cylindrical mouth portion l. The extrusion mold shown in FIG. 3 is used, and the extrusion mold shown in FIG. 4 is used in the (2) top pressing step.

That is, in FIG. 3, lO is the base and the lower die 1
1 is provided to be slidable in the vertical direction, and is biased upward by a spring member I2. Further, the lower die 11 is guided with respect to the base lO by a guide mechanism 13 consisting of a guide groove 13a and a guide member 13b. On the other hand,
An upper die 14 is disposed above the lower die ll,
It is urged downward by a spring member l5. and,
The upper and lower guides 11 and 14 each have hose joint fittings J.
a first mold surface 15°15 having a shape corresponding to the collar portion 3;
A punch insertion hole 16 extending in the vertical direction is formed. This punch insertion hole 16 has a lower punch 17 that is equal to the gap between the mouthpiece l of the hose joint fitting J and the pipe part 2, and an upper punch 1 that moves up and down together with the upper die II.
B is inserted. Note that 19 is a spring member.

The extrusion die used in the upper extrusion process in FIG. 4 is the same as that in FIG. 3 except that it has the same shape as the upper punch 20 or the lower punch 17, so the same numbers will be given to the same parts and the description will be given below. Omitted.

In the extrusion process ■ and ■ using the above extrusion mold, the mouth part l
When extruded backward (Figures 3 and 4, the left half shows before extrusion and the right half shows after extrusion), the first perforation 5 of the pipe part 2 protruding from the center of the mouth part is surrounded by the collar part 2. , it contracts or does not close, and the next hole to be drilled will be the guide hole 7 when drilling in step (3).

Therefore, in the drilling process (2), the second perforation 8 is drilled without eccentricity along the guide holes 7, 7.

The above process is a manufacturing process for a hose joint fitting on both sides, but as shown in Fig. 2, when one side is made into a joint part 4 without a mouthpiece, rectangular extrusion is performed instead of the backward extrusion process (■) on one side. The joint portion 4 having a diameter smaller than that of the shaft portion may be formed by performing the following steps.

(Effects of the Invention) As is clear from the above explanation, according to the present invention, the mouthpiece and pipe part of the port joint fitting can be integrally formed by extrusion processing, so that the reliability of the shaft rod strength of the pipe part is improved. Improve dramatically.

In addition, since the parts of the hose joint fittings are manufactured continuously using rods, the number of parts and assembly man-hours can be reduced.
Coupled with improved productivity, manufacturing costs for hose joint fittings can be significantly reduced.

Although the present invention has been explained based on an example of manufacturing a hose-geared β-type metal fitting, it can be applied to the manufacture of various double-pipe structure components in which an inner tube and an outer tube need to be welded.

[Brief explanation of the drawing]

Fig. 1 is a process diagram for manufacturing a double-sided hose joint fitting by applying the method of the present invention, Fig. 2 is a cross-sectional view of a one-sided hose joint fitting, and Figs. 3 and 4 show upper extrusion processing and It is a cross-sectional view showing an extrusion die used for top extrusion processing, with the left half showing the state before extrusion and the right half showing the state after extrusion. FIG. 5 is a process diagram showing a conventional method of making a port joint fitting.

Claims (3)

[Claims] (1) A mouthpiece formed by rearward extrusion in the axial direction of a bar material having a first perforation in the center, and a protrusion formed at the center of the mouthpiece by the backward extrusion, and the first perforation deforms the protrusion. and a pipe portion having a second perforation formed by drilling along the remaining guide hole, and a flange portion protruding from the outer periphery of the mouthpiece portion formed by axially pressurizing the bar material. An integrated hose joint fitting featuring the following. (2) The integrated hose joint fitting according to item 1, wherein the second perforation of the pipe portion communicates with the first perforation that remains without being deformed during the backward extrusion. (3) a first drilling step in which a preliminary hole is made in the center of a rod material cut to approximately the same volume as the product; and an upsetting step in which the rod material is pressurized in the axial direction to form a collar around the rod material; A backward extrusion process in which a bar material with pre-drilled holes is pressurized in the axial direction to form a cylindrical mouthpiece, and a pipe part formed at the center of the cylindrical mouthpiece by this extrusion process is inserted into a guide hole located at the center. A method for manufacturing an integrated hose joint fitting, characterized by comprising the step of drilling a hole along the side.