JPH10118738A - Manufacture of metallic tool with bracket and metallic tool with bracket, and hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve the improvement in universal applicability and the reduction in cost by forming a preform having a columnar part corresponding to a socket part and a bracket part and there-after, forming the columnar part in the preform into the socket part with the backward extrusion of a cold forging. SOLUTION: A metallic tool 11 with the bracket is constituted mainly of the socket part 13 for fitting by inserting a brake hose 12 and the bracket part 14 for fixedly supporting. The socket part 13 is composed of a pipe body having a shaft hole 15. The bracket part 14 is composed of almost elliptic plate. In order to manufacture the metallic tool 11 with the bracket, the preform is integrally formed with the same material by means of plastic working. The preform has the solid columnar part corresponding to the socket part 13 and the bracket part 14. The columnar part is formed into the socket part 13 with the backward extrusion of the cold forging. By this method, the yield of the material is improved in addition to the improvement of the universal applicability and the reduction of the cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a bracket with a bracket used for an automobile brake hose and the like, and a bracket with the bracket manufactured by the method.
And a hose provided with the bracket with the bracket.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. Hei 5-67979 discloses a method of manufacturing "an intermediate fitting in a hydraulic hose" which is a fitting with a bracket. This manufacturing method is illustrated in FIG.
As shown in (1), a round bar 1 having a predetermined height and diameter is used as a raw material (a), and a hollow cylindrical portion 2 is formed by extruding one end of the round bar 1 backward (b). Next, a swelling portion 3 is formed by swelling and molding at an intermediate portion of the round bar 1 (c).
Is unevenly expanded in one direction to form the uneven thickness flange portion 4 (d). Next, the bulging portion 3 and the uneven thickness flange portion 4 are formed into a flange-like mounting piece 5 by upsetting, and a concave portion 6 is formed at the other end.
(E), and a partition wall 7 between the concave portion 6 and the cylindrical portion 2 is stamped and formed to produce an asymmetrical intermediate metal fitting 10 having a socket portion 8 and a bracket portion 9 (f). .
By manufacturing in this way, the efficiency is higher and the yield is higher as compared with the conventional manufacturing method mainly based on cutting.

[0003]

The manufacturing method disclosed herein is based on continuously forming each of the steps (a to f) by using a multi-stage header (not shown). For this reason, if the amount of the portion (eccentric flange 4) that is eccentric from the pressing direction (the axial direction of the round bar 1) increases, it becomes difficult to form the portion. Therefore, in the case where the same header cannot be formed with a shape that cannot be formed, it is necessary to take measures such as performing the steps after the uneven thickness bulging by a separate press machine. That is, this manufacturing method has a problem that only a metal fitting having a small amount of eccentricity can be actually manufactured.

Accordingly, the present invention provides a manufacturing method capable of easily manufacturing a bracket with a bracket having any shape, a bracket with the bracket manufactured by this manufacturing method, and a hose provided with the bracket. It was invented to provide.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is a method of manufacturing a bracket-equipped metal fitting having a socket portion and a bracket portion extending in a radial direction of the socket portion. After forming an intermediate molded product having a cylindrical portion and a bracket portion corresponding to the above, the cylindrical portion of the intermediate molded product is formed into a socket portion by backward extrusion of cold forging. In this method, the shaping of the shaft hole of the socket portion is completed by punching. Further, it is preferable to integrally mold the intermediate molded product by plastic working. The material of the intermediate molded product may be a round bar having a diameter equal to the outer diameter of the cylindrical portion. Alternatively, a plate that is thicker than the bracket portion and thinner than the length of the columnar portion may be used. Alternatively, it may be a plate having a thickness substantially equal to the length of the cylindrical portion. Further, the present invention is a bracket with a bracket manufactured by these manufacturing methods. The present invention is a hose to which the bracket with the bracket is attached.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, an embodiment of a bracket with a bracket according to the present invention will be described with reference to FIG. The bracket-equipped bracket 11 is mainly constituted by a socket 13 through which a brake hose 12 and the like are inserted and attached thereto, and a bracket 14 for fixed support. The socket 13 has a shaft hole 15 having a diameter d substantially equal to the outer diameter of the hose.
And a straight tube having The bracket portion 14 is formed of a substantially oval plate having a predetermined thickness T, and is integrated so as to extend from one axial end of the socket portion 13 to one radial direction. The plate width is slightly larger than the outer diameter D of the socket portion 13, and the plate length is formed sufficiently longer than the outer diameter D of the socket portion 13, for example, about two to three times. The shaft hole 15 of the socket 13 penetrates the bracket 14. At the center of the extension side semicircular portion 16 of the bracket portion 14, an attachment hole 17 for inserting a bolt or the like is formed. The base-side semicircular portion 18 of the bracket portion 14
It is formed in a flange shape protruding from the outer periphery of the socket portion 13.

Next, a method of manufacturing the bracket with the bracket according to the present invention will be described as a step of manufacturing the bracket 11. First, as a first step, an intermediate molded article 21 as shown in FIG. 2 is integrally formed by plastic working with the same material. The intermediate molded product 21 has a solid cylindrical portion 22 corresponding to the socket portion 13 and a bracket portion 14 integrally formed at one end of the cylindrical portion 22. Although the mounting holes 17 are not formed in the bracket portion 14 in the illustrated example, the mounting holes 17 may be formed at this stage. The cylindrical portion 22 has a volume substantially equal to that of the socket portion 13 and has an outer diameter D equal to that of the socket portion 13.

FIG. 4 shows an example of a manufacturing apparatus (die) 31 used in the first step, and an upper mold 34 having a fixed mold 32 and a movable mold 33 is opposed to the upper mold 34. A fixed lower mold 35 is provided. The fixed mold 32 is formed with a straight hole 36 for slidably guiding the movable mold 33, and a lower surface 37 is formed with a cavity 38 having a shape corresponding to the bracket portion 14. The movable die 33 is formed as a punch having a diameter equal to the outer diameter D of the cylindrical portion 22. On the upper surface 39 of the lower mold 35, a recess 40 having a size corresponding to the upper mold 34 and an appropriate depth is formed. That is, the bottom surface 41 of the concave portion 40 is a surface that partitions the lower side of the cavity 38 when the fixed mold 32 is held.

First, the movable mold 33 is provided by the manufacturing apparatus 31.
Is raised, and a round bar 42 having a circular cross section, which is a material, is set upright in the straight hole 38 below. Round bar 4
2 has an outer diameter D equal to the cylindrical portion 22 that fits in the straight hole 38, and the overall volume is equal to the intermediate molded body 21. As the material, a carbon steel wire for cold heading (SWCH) or an equivalent product thereof is selected. In addition, what performed the annealing process and the lubrication process as needed may be used. In addition to steel, metals such as aluminum, copper or alloys thereof can be used. Then, the movable mold 33 with a predetermined pressure P
Is lowered to cause a part (lower part) of the round bar 42 to flow laterally, that is, into the cavity 38. At this point, when the lower surface of the movable mold 33 advances a predetermined distance toward the bottom surface 41 of the concave portion 40, the intermediate molded product 21 having a predetermined shape (see FIG. 2).
Is obtained.

Next, as a second step, the cylindrical portion 22 of the intermediate molded product 21 is extruded backward, and the socket portion 13 is extruded.
Is molded. FIG. 6 shows a manufacturing apparatus 5 used in the second step.
In this example, a lower mold 35 and a fixed mold 32 similar to those of the manufacturing apparatus 31 are provided, and a movable mold 52 having a diameter d smaller than the straight hole 36 of the fixed mold 32 is provided. The diameter d of the movable mold 52 is equal to the shaft hole 15 of the socket 13. By lowering the movable mold 52 at a predetermined pressure P with the intermediate molded product 21 set in the cavity 38 and the straight hole 36, the cylindrical portion 22 is opened at the center thereof at the same time as the movable mold 52. 52 and fixed type 32
Is plastically deformed so as to swell in a gap between the inner wall of the straight hole 36 and the tubular socket portion 13. Therefore, the second step is
After the completion of the first step, only the movable dies 33 and 52 are exchanged, so that they can be continuously performed. Before the second step, the intermediate molded product 21 may be annealed to facilitate backward extrusion. Further, a lubrication process may be performed together with the annealing process.

Next, as a third step, a portion 54 corresponding to the hole bottom of the hole 53 formed by backward extrusion is punched by being punched, and the forming of the shaft hole 15 is completed.
In addition, the final shape of the bracket with bracket 11 as shown in FIG. 1 is obtained by punching or cutting the mounting hole 17 on the extension end side of the bracket portion 14.

FIG. 1 (c) shows a brake hose 12 provided with the bracket 11 with a bracket. The brake hose 12 includes, for example, a brake-resistant rubber tube, a double reinforcing layer woven with fibers such as polyester, a rubber sheet for cushioning between upper and lower reinforcing layers, and a weather-resistant outer layer. It is composed of cover rubber. When attaching the bracket-equipped bracket 11 to the brake hose 12, the brake hose 12 is connected to the socket 13
After being adjusted to a predetermined position by passing through the shaft hole 15, the bracket 13 with the bracket is fixed by tightening the socket portion 13 in the diameter reducing direction with an appropriate tool to deform by caulking. The bracket portion 14 is attached to a fixing system (frame or the like) of the partner device with bolts and nuts or the like, thereby supporting the brake hose 12 via the socket portion 13.

As described above, the intermediate molded product 21 provided with the cylindrical portion 22 corresponding to the socket portion 13 and the bracket portion 14
Then, the cylindrical portion 22 of the intermediate molded product 21 is subjected to cold forging backward extrusion to form the socket portion 13, so that brackets having various shapes can be easily manufactured. That is, a bracket with a relatively large volume of the bracket portion 14, for example, as shown in FIG. 3, the bracket-equipped bracket 23 having a substantially triangular shape in which the bracket portion 24 becomes wider toward the extension end can be easily manufactured. Therefore, a versatile, low-cost, low-cost manufacturing method can be achieved. Further, in this embodiment, since the intermediate molded product 21 is also integrally formed by plastic working, the yield of the material can be made better than in the method of manufacturing by cutting. Further socket part 1
3 is also formed by backward extrusion of cold forging, so that it is not necessary to perform a cutting process for drilling holes, and the cost can be further reduced.
In addition, since the bracket-attached brackets 11 and 23 are integrated without any parts such as brazing, a highly reliable and high-quality product can be obtained. And this bracket attachment 1
The brake hose 12 provided with 1, 23 can be a highly durable brake hose 12 with stable mounting support.

Next, FIG. 5 shows another embodiment of the method of manufacturing the bracket with the bracket according to the present invention. In forming the intermediate molded product 21 in the first step in the above embodiment, the material 61 is used. Is used, and is plastically deformed and processed into a predetermined shape. The manufacturing apparatus 62 used in this method includes a fixed die 65 having a straight hole 64 corresponding to the size of the bracket portion 14 as the upper die 63.
And a movable mold 68 slidable along the straight hole 64 and having a cavity 67 on the lower surface 66. The cavity 67 is formed with a volume and a relative position corresponding to the column portion 22. The lower die 68 has a concave portion 69 that fits on the outer periphery of the upper die 63.

In order to perform the molding, first, a predetermined thickness t
Is cut into a material 61 having a volume equal to that of the intermediate molded product 21, and is placed on the bottom surface 70 of the concave portion 69 of the lower die 68. The plate thickness t is, for example, larger than the thickness T of the bracket portion and smaller than the length (total height h) of the columnar portion 22. The dimensions of the material 61 are set and selected according to the material and hardness of the material 61, the lubrication method, the pressing force P of the press, and the like.
The set position is, for example, a position close to the cavity 67 in the straight hole 64, and is set at both ends 61a, 61a in the longitudinal direction.
1b is positioned outside the cavity 67.
Then, the movable mold 68 is lowered along the straight hole 64 at a predetermined pressure P. Due to this lowering, both ends 61a of the material 61,
61b first hits the flat lower surface 66 of the movable portion 68,
This portion is compressed and deformed laterally to reduce the thickness t, and is formed as a bracket portion 14 having a predetermined thickness T and a shape. At the same time, a part of the raw material 61 rises into the cavity 67 to form the cylindrical portion 22, and the intermediate molded product 21 having a predetermined size as a whole is obtained. In this embodiment, since the length of the lateral flow is shorter than that of the above embodiment,
The pressing force P can be made relatively small. The intermediate molded product 21 is extruded backward by the manufacturing apparatus 51 shown in FIG. 6 to finish the socket portion 13 into a final shape. The other configurations, functions and effects are the same as those of the above-described embodiment.

In the embodiment shown in FIG. 5, both ends of the bracket portion 14 of the intermediate molded product 21 are restrained by the inner peripheral wall of the straight hole 64 of the fixed mold 65, but without using the fixed mold 65. The pressure forming may be performed only by the movable mold 68 so that the material 61 flows freely to the side. In this case, since the swelling into the cavity 67 can hardly be expected, the thickness of the material 61 is assumed to be substantially equal to the total height h of the cylindrical portion 22 from the beginning, and only the portion corresponding to the bracket portion 14 is compressed and extended. I do. By doing so, the upper die 63 of the manufacturing apparatus 62 can be simplified. The portion larger than the predetermined size is cut by the bracket 1
The final shape is adjusted to 4, and the intermediate molded product is subjected to a post-process.

The brackets 11, 23 according to the present invention.
Is not necessarily attached to the brake hose 12, but can be widely applied to other similar industrial hoses.

[0019]

In summary, according to the present invention, regardless of the shape of the bracket portion, it can be easily manufactured, and the versatility is improved and the cost is reduced. Further, by integrally forming the intermediate molded product by plastic working, the yield of the material can be improved. Further, since the socket portion is also formed by backward extrusion of the cold forging, a cutting process for making a hole is not required, and the cost can be further reduced. In addition, since the bracket with the bracket according to the present invention is integrally formed without portions such as brazing, a highly reliable and high quality product can be obtained. Further, the hose of the present invention can be a hose having high durability with stable mounting support.

[Brief description of the drawings]

FIG. 1 is a view showing a bracket with a bracket according to the present invention, wherein (a) is a perspective view, (b) is a plan view, and (c) is a cross-sectional view taken along line AA.

FIG. 2 is a view showing an embodiment of a method of manufacturing a bracket with a bracket according to the present invention, wherein (a) is a perspective view,
(B) is a plan view, and (c) is a sectional view taken along line BB of FIG.

FIG. 3 is a perspective view showing another embodiment of FIG. 1;

FIG. 4 is a side sectional view showing a manufacturing apparatus for manufacturing the intermediate molded product of FIG. 2;

FIG. 5 is a side sectional view showing an example of another manufacturing apparatus in FIG. 4;

FIG. 6 is a side sectional view showing a manufacturing apparatus for manufacturing the bracket with the bracket of FIG. 1 from the intermediate molded product of FIG. 2;

FIG. 7 is a partial cross-sectional side view showing a method for manufacturing a conventional bracket-equipped bracket.

[Explanation of symbols]

 11, 23 bracket with bracket 12 brake hose (hose) 13 socket part 14 bracket part 15 shaft hole 21 intermediate molded product 22 cylindrical part 42, 61 material T thickness of bracket part h total height (height) of cylindrical part t material Board thickness

Claims (8)

[Claims] 1. A method for manufacturing a bracket with a bracket having a socket portion and a bracket portion extending in a radial direction of the socket portion, comprising a column portion corresponding to the socket portion and the bracket portion. A method for manufacturing a bracket with a bracket, comprising: after forming an intermediate molded product, forming a cylindrical portion of the intermediate molded product into the socket portion by backward extrusion of cold forging. 2. The method for manufacturing a bracket with a bracket according to claim 1, wherein the shaping of the shaft hole of the socket portion is completed by punching. 3. The method for manufacturing a bracket with a bracket according to claim 1, wherein the intermediate molded product is integrally formed by plastic working. 4. The method according to claim 3, wherein the material of the intermediate molded product is a round bar having a diameter equal to the outer diameter of the cylindrical portion. 5. The method according to claim 3, wherein a material of the intermediate molded product is a plate thicker than the bracket portion and thinner than the length of the cylindrical portion. 6. The method according to claim 3, wherein the material of the intermediate molded product is a plate having a thickness substantially equal to the length of the cylindrical portion. 7. A bracket with a bracket, which is manufactured by the method for manufacturing a bracket with a bracket according to any one of claims 1 to 6. 8. A hose to which the bracket with the bracket according to claim 7 is attached.