JPH0753301B2 - Manufacturing method for hydraulic brake hose fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a method for manufacturing a hydraulic brake hose mouth fitting that improves productivity by enabling continuous production.

2. Description of the Related Art Conventionally, when a hydraulic brake hose mouth fitting a as shown in FIG. 9 is manufactured, it is cut into a predetermined length using a drawing material, and then the joint b is cut with a cutting tool such as a cutting tool. Even though processing is performed, in such a manufacturing method, since the joint portion b is cut into a columnar shape from a material having a corner portion, a blade such as a cutting tool is easily chipped at the corner portion, and the cutting tool has a short life. Since the material with low dimensional accuracy is chucked, the processing accuracy is poor, and the base c of the joint b
In the above, since the strength of the joint b is reduced by cutting the flow line of the material, there is a drawback that the yield is poor.

When manufacturing from a rod-shaped material, a rod-shaped material having a diameter smaller than that of the base body d of the hydraulic brake hose mouth fitting a is used, and the material is first expanded to the same shape as the columnar base body d having a rectangular cross section, Even though the joint b is extruded, in such a method, when the transfer to the next process is performed, the rod-shaped material and the bulging-formed material are significantly different in outer diameter dimension, so that the transfer chuck is the same. However, there is a disadvantage in that the opening and closing times of the above materials are different from each other and the chucking cannot be performed at the same time, and the transfer time to the next process is delayed by this amount.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention is a liquid that facilitates transfer in the molding process to improve mass productivity, prolongs the life of a cutting tool, and further eliminates cutting of a flow line at a joint portion to improve strength. It is intended to provide a method for manufacturing a pressure brake hose mouth fitting.

[Structure of Invention]

Means for Solving the Problems In view of such a point, the present invention is an upsetting in which a flat columnar material forming a flat surface portion parallel to an opposing side in an arbitrary diameter direction of a columnar member is formed in a generally bulging shape, A first step of extruding the protruding portion with a die that continuously forms a gentle curved portion on the cavity on the inlet side of the throttle portion that forms a cylindrical protruding portion having a smaller diameter forward than the swollen portion that has been swept up, and It is an object of the present invention to provide a method for manufacturing a hydraulic brake hose mouth fitting which comprises a second step of forming a bulged portion of a molded material into a product shape in a bulged shape.

Operation In the present invention, upsetting for forming a flat columnar material forming a plane portion parallel to the opposite side in the arbitrary diameter direction of the columnar member into an overall bulging shape, and the upsetting The first material for extruding the protrusion is formed by a die that continuously forms a gentle curved portion on the cavity on the inlet side of the narrowed portion that forms a cylindrical protrusion having a diameter smaller than the exit.

Next, the bulging part and the projecting part of the first material are bulged to the product shape and molded into the second material.

EXAMPLE An example of the present invention will be described below with reference to the drawings. 1 is a first mold used in the first step, and the first mold 1
The punch housing 3 is fixed to the pressure plate 2 which can be moved back and forth by an appropriate driving device (not shown).
The punch housing 3 is provided with a punch 5 for forming the tip portion 4 in a substantially rectangular shape in cross section, a punch side 7 for mounting the tip portion 4 of the punch 5 from the punch housing 3 through a support block 6, and a predetermined length. A cavity 9 having a gentle curved portion 8 is formed in the front so that the flat material W cut in the form of a bulge portion is formed, and a squeezing portion for restricting the projection diameter further forward from the cavity 9 is formed.
Die holder that houses a die housing 12 that fixes a die 11 that forms 10 to a pressure plate (not shown)
The auxiliary ring 14, 13a of 13 and the die side 15 to be press-fitted into the auxiliary ring 14 and 14a.

In the figure, 16 and 16a are ejector sleeves, and 17 is an ejector pin.

18 is a second mold used in the second step, and the second mold 18
The punch housing 20 is fixed to the pressure plate 19 which can be moved back and forth by an appropriate drive device (not shown),
The punch housing 20 is provided with a punch 22 for forming the distal end portion 21 in a substantially rectangular cross section, a punch side 24 for mounting the distal end portion 21 of the punch 22 from the punch housing 20 through a support block 23, and A die in which the cavity 26 is formed so that the bulging portion 25 of the first material Wa formed by the one die 1 is further bulged to the product S shape.
Auxiliary rings 30, 30a of the die holder 29, in which the die 27 is housed inside the die housing 28, which is fixed to the pressure plate (not shown).
It is configured with the die side 31 that can be press-fitted into.

Next, a method of manufacturing the hydraulic brake hose mouth fitting according to the present invention will be described. A flat columnar material W forming a flat surface portion parallel to the opposite side in the arbitrary diameter direction of the cylindrical portion cut into a predetermined length is formed on the die side. 15
Punch 5 on the punch side 7
Is pressed toward the die side 15 to form the material W as a whole into a swollen shape to form a swollen portion 25, and at the same time, a predetermined diameter is formed forward of the swollen portion 25 via the narrowed portion 10. The first material Wa as shown in FIG. 6 is obtained by pushing the protruding portion 32 to be extruded.
It can be molded into.

Next, by inserting the first material Wa into the cavity 26 on the die side 31 and pressing the punch 22 on the punch side 24 toward the die side 31, the bulging portion 25 and the protruding portion 32 of the first material Wa.
Is swelled up to the product S shape and molded into a second material Wb as shown in FIG.

〔The invention's effect〕

In short, according to the present invention, upsetting for forming a flat columnar material W forming a flat portion parallel to the opposite side in the arbitrary diameter direction of the columnar member into a bulge as a whole, and the uplifted bulge 25
A narrowed portion forming a cylindrical protrusion 32 having a smaller diameter toward the front.
10 The first step of extruding the protrusion 32 with a die 11 that continuously forms a gentle curved portion 8 on the cavity on the inlet side, and the bulging portion 25 of the molded material Wa is bulged to a product S shape. Since the second step of molding is performed, the parallel flat surface portion of the flat columnar material W remains until the product S,
Therefore, the flat surface portion can be used as it is as a nut portion, the step of forming a hexagonal body is not required, and the curved portion 8 on the inlet side of the throttle portion 10 is formed gently, so that the protruding portion 32 can be extruded. The smooth flow of the material does not impose a burden on the mold, prolongs the life of the mold, and is effective in preventing strength deterioration because the material itself is not plastically deformed. Furthermore, the same transfer chuck allows each process to be performed. When chucking materials, the shape of the chucking location of each material is only slightly changed to bulge, so there is no time difference when chucking as in the past, and the timing of transfer The transfer delay due to the deviation of the product can be eliminated, the mass productivity in continuous processing can be improved, and the upsetting and the extrusion which were conventionally performed in separate processes can be done in one process. Since it is possible to simplify the process and the transfer timing to the next process is easy, continuous processing is possible, mass productivity can be improved, and the protrusion 32 is formed in a columnar shape. , It reduces the load on the cutting tool such as the bite, prolongs the life of the cutting tool, and has less cutting allowance when cutting the protruding portion 32.
Even if the outer diameter of the protrusion 32 is cut, the protrusion
Since there are no cutting points in the flow line at the base 33 of the 32, and it is possible to significantly improve the strength as compared with directly cutting the protruding portion 32 from the conventional drawn material, the yield as the product S is improved. The practical effect of being able to tighten is enormous.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is a sectional view of a mold used in the first step of the method for manufacturing a hydraulic brake hose mouth fitting according to the present invention, and FIG. Sectional views of the mold used in the two steps, and FIGS. 3 to 9 are manufacturing step diagrams of the same. 10 throttle, 25 bulge, 32 protrusion, 33 base

Claims (1)

[Claims] 1. Upsetting for forming a flat columnar material forming a plane portion parallel to the opposing side in an arbitrary diameter direction of a columnar member into a generally bulging shape, and forward of the swollen portion swelling. A first step of extruding the protruding portion with a die that continuously forms a gentle curved portion on the cavity on the inlet side of the narrowed portion that forms a cylindrical protruding portion with a small diameter, and a bulging portion of the formed material into a product shape A method for manufacturing a hydraulic brake hose mouth fitting, which comprises a second step of forming into a bulge.