JP3572826B2 - Manufacturing method of bracket with bracket - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a bracket with a bracket used for an automobile brake hose or the like.
[0002]
[Prior art]
Japanese Unexamined Patent Publication No. Hei 5-67979 discloses a method of manufacturing a "metallic fitting for a hydraulic hose" which is a fitting with a bracket. In this manufacturing method, as shown in FIG. 6 , 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, the bulging portion 3 is formed by bulging in the middle portion of the round bar 1 (c), and the bulging portion 3 is bulged in one direction to form the bulged 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 formed. Is punched to produce an asymmetrical intermediate metal fitting 10 having a socket part 8 and a bracket part 9 (f). By manufacturing in this way, the efficiency is higher and the yield is higher than in a conventional manufacturing method mainly based on cutting.
[0003]
[Problems to be solved by the invention]
By the way, the disclosed manufacturing method is based on forming each step (a to f) continuously using a multi-stage header (not shown). For this reason, if the amount of the portion (eccentric flange 4) which is eccentric from the pressing direction (axial direction of the round bar 1) becomes large, it becomes difficult to form the portion. Therefore, in the case where the same header cannot be formed in 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 with a small eccentricity can be actually manufactured.
[0004]
Therefore, the present invention provides a manufacturing method capable of easily manufacturing a bracket with a bracket having any shape of a bracket, a bracket with a bracket manufactured by this manufacturing method, and a hose including the bracket with the bracket. It was invented.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, the present invention is a method for manufacturing a bracket with a bracket having a tubular socket portion and a bracket portion extending in the radial direction of the socket portion, wherein the thickness is larger than the thickness of the bracket portion. A flat plate-shaped material having a thickness equal to or less than the height of the cylindrical portion to be described later is plastically processed to form an intermediate molded product having a cylindrical portion having an outer diameter equal to the socket portion and a bracket portion having the same thickness as the bracket portion. After that, the cylindrical part of the intermediate molded product is formed into the socket part by backward extrusion of cold forging.
The present invention is also directed to the method, wherein the flat material has a thickness equal to the height of the column portion, and the step of forming the column portion into the socket portion includes the step of forming the bracket portion of the intermediate molded product. After adjustment to the final shape is also a part of the feature .
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0007]
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 mainly includes 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 portion 13 is a straight tube having a shaft hole 15 having a diameter d substantially equal to the outer diameter of the hose. 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 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 position 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 is formed in a flange shape that protrudes beyond the outer periphery of the socket portion 13.
[0008]
Next, a method of manufacturing a bracket with a 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 product 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.
[0009]
FIG. 4 shows an embodiment of a method of manufacturing a bracket with a bracket according to the present invention. In forming the intermediate molded product 21 in the first step in the embodiment, a plate-like material is used as the raw material 61. Then, this is plastically deformed and processed into a predetermined shape. The manufacturing apparatus 62 used in this method includes a fixed mold 65 having a straight hole 64 corresponding to the size of the bracket portion 14 as the upper mold 63, a slidable along the straight hole 64, and a cavity 66 on the lower surface 66. And a movable mold 68 having a 67. 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.
[0010]
In order to perform the molding, first, a plate having a predetermined thickness t is cut to obtain a material 61 having a volume equal to that of the intermediate molded product 21, and this 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 cylindrical portion 22. As the material of the raw material 61, carbon steel for cold pressing forging 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, and alloys thereof can be used. The dimensions of the material 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 near the cavity 67 in the straight hole 64 such that both longitudinal end portions 61a and 61b are located 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 end portions 61a and 61b of the material 61 first come into contact with the flat lower surface 66 of the movable portion 68, and this portion is compressed and deformed laterally to reduce the thickness t. It is molded as a bracket part 14 having 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 dimension as a whole is obtained. In this embodiment, since the bracket portion 14 is compressed, the pressing force P can be relatively reduced. The intermediate product 21 is extruded backward as a second step by the manufacturing apparatus 51 shown in FIG. 5 to finish the socket portion 13 into a final shape.
[0011]
In the second step, performing backward extrusion against the cylindrical portion 22 of the intermediate molded article 21, forming the socket portion 13. FIG. 5 shows an example of the manufacturing apparatus 51 used in the second step. The lower mold 35 and the fixed mold 32 are the same as the manufacturing apparatus 31, and the diameter d is smaller than the straight hole 36 of the fixed mold 32. A movable mold 52 is provided. The diameter d of the movable mold 52 is equal to the shaft hole 15 of the socket 13. When the movable mold 52 is lowered at a predetermined pressure P in a state where the intermediate molded product 21 is set in the cavity 38 and the straight hole 36, a hole 53 is opened at the center of the cylindrical portion 22, and at the same time, the movable mold 52 is moved. The tubular socket portion 13 is plastically deformed so as to swell in a gap between the inner wall 52 and the inner wall of the straight hole 36 of the fixed mold 32. Therefore, the second step can be performed continuously by replacing only the movable dies 33 and 52 after the first step is completed. Before the second step, annealing may be performed on the intermediate molded product 21 to facilitate backward extrusion. Further, a lubrication process may be performed together with the annealing process.
[0012]
Next, as a third step, the 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 extending end side of the bracket portion 14.
[0013]
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 passed through the shaft hole 15 of the socket portion 13 and adjusted to a predetermined position, and then the socket portion 13 is tightened in a diameter reducing direction with an appropriate tool. The metal fitting 11 with a bracket is fixed by caulking deformation. The bracket portion 14 is attached to a fixing system (a frame or the like) of a partner device by a bolt, a nut, or the like, thereby supporting the brake hose 12 via the socket portion 13.
[0014]
As described above, after the intermediate molded product 21 having the cylindrical portion 22 and the bracket portion 14 corresponding to the socket portion 13 is formed, the cylindrical portion 22 of the intermediate molded product 21 is subjected to cold forging backward extrusion. Since the socket portion 13 is formed, brackets with various shapes of brackets can be easily manufactured. That is, a bracket having a relatively large volume of the bracket portion 14, for example, as shown in FIG. 3, the bracket-equipped bracket 23 having a generally 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 the method of manufacturing by cutting. Further, since the socket portion 13 is also formed by backward extrusion of the cold forging, a cutting process for drilling is not required, and the cost can be further reduced. In addition, since the brackets 11 and 23 are integrally formed without portions such as brazing, a highly reliable and high quality product can be obtained. The brake hose 12 provided with the brackets 11 and 23 can be a highly durable brake hose 12 with stable mounting and support.
[0015]
In the embodiment of FIG. 4 , 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 the movable mold 68 is used without using the fixed mold 65. The material 61 may be freely flown to the side by performing pressure molding only by using the pressure. In this case, almost no swelling into the cavity 67 can be expected. Therefore, 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. Then, the portion larger than the predetermined size is adjusted to the final shape of the bracket portion 14 by cutting or the like, and the intermediate molded product is subjected to a subsequent process.
[0016]
The bracket-equipped brackets 11 and 23 of the present invention are not necessarily attached to the brake hose 12, but can be widely applied to other similar industrial hoses.
[0017]
【The invention's effect】
In short, according to the present invention, it can be easily manufactured regardless of the shape of the bracket portion, and versatility is improved and 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 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 .
[Brief description of the drawings]
1A and 1B are diagrams showing a bracket with a bracket according to the present invention, wherein FIG. 1A is a perspective view, FIG. 1B is a plan view, and FIG. 1C is a cross-sectional view taken along line AA.
FIGS. 2A and 2B are views showing an embodiment of a method for manufacturing a bracket with a bracket according to the present invention, wherein FIG. 2A is a perspective view, FIG. 2B is a plan view, and FIG. It is sectional drawing.
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 a manufacturing apparatus for manufacturing the bracket with the bracket of FIG. 1 from the intermediate molded product of FIG . 2;
FIG. 6 is a partial cross-sectional side view illustrating a method for manufacturing a conventional bracket-equipped bracket.
[Explanation of symbols]
11,23 Bracket fitting 12 Brake hose (hose)
13 Socket part 14 Bracket part 15 Shaft hole 21 Intermediate molded product 22 Column part
61 material T Thickness of bracket part h Overall height of cylinder part (height)
t Material thickness

Claims (3)

A method for manufacturing a bracket-equipped bracket having a tubular socket portion and a bracket portion extending in a radial direction of the socket portion, wherein the thickness is greater than the thickness of the bracket portion and is equal to or less than the height of a cylindrical portion described below. After forming an intermediate molded product having a cylindrical portion having an outer diameter equal to the socket portion and a bracket portion having the same thickness as the bracket portion by plastically processing the flat plate-shaped material having the same thickness, the cylindrical portion of the intermediate molded product is formed. Of the bracket with a bracket, characterized by being formed into the above-mentioned socket portion by cold forging backward extrusion. The method for manufacturing a bracket with a bracket according to claim 1, wherein the plate-shaped material has a thickness equal to the height of the column portion. The method for manufacturing a bracket with a bracket according to claim 2, wherein the step of molding the cylindrical portion into the socket portion is after adjusting the bracket portion of the intermediate molded product to a final shape .

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