JPH0280129A - Manufacture of hose fittings - Google Patents

Abstract

PURPOSE:To uniformize the thickness of a cylinder part by punching the bottom of a cup deep-drawn from a metallic sheet and ironing the inner peripheral surface under the control of the outer diameter of the cup. CONSTITUTION:At a 1st stage, the metallic sheet is deep-drawn to form a bottomed cylindrical cup part 10. Then, at a 2nd stage, the bottom of the cup part 10 is punched at a 3rd stage, the inner peripheral surface of the cup part 10 is ironed under the control of the outer diameter of the cup part 10. At the 3rd stage, for example, the punch 50 having an outer diameter larger than the inner diameter of the cup part 10 and a die 30 controlling the outer diameter of the cup part 10 are used, and as a punch advances, the inner diameter of the cup part 10 is expanded. At this time, since the cup part 10 has no bottom, no tension acts on the cup part 10 in front of the punch 50 and the thickness of the cup part 10 takes a fixed value determined by a clearance between the punch 50 and the die 30. In this way, a cylinder part having a uniform thickness is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a hose fitting having a cylindrical portion into which a hose is inserted and caulked.

[Prior Art 1] For example, hose fittings as shown in FIGS. 7 and 8 are known. This hose fitting has a plate-shaped flange part 1
00 and a cylindrical portion 200 protruding from the flange portion 100. Then, the hose is inserted into the cylindrical portion 200 and caulked from the outer circumferential direction, thereby fastening the hose. Further, the flange portion 100 is provided with mounting holes 101 and the like, and is fixed to a bracket extending from the mounted portion with bolts or the like.

Incidentally, in order to manufacture this hose fitting, a manufacturing method such as that disclosed in, for example, Japanese Unexamined Patent Publication No. 61-62692 is used. That is, a cup portion with a bottom is formed by deep drawing a metal plate having a predetermined shape using a press. After treating the bottom of the cup portion, a burring process is performed to process the acute angles, etc., to form the cylindrical portion.

[Problems to be Solved by the Invention] In deep drawing, the punch force is received by the portion of the metal plate that is in contact with the punch tip surface. Therefore, the wall thickness of the cup portion to be molded is thinner as it approaches the bottom, and thicker as it approaches the flange portion. For this reason, hose fittings obtained by conventional manufacturing methods have local wall thicknesses that are uneven in the axial direction, as shown in FIG. By the way, after the hose is inserted into the cylindrical portion, the cylindrical portion is pressed in the radial direction from the outer circumferential surface and is plastically deformed to fasten the hose. And the meat of the tube
The thinner ν is, the easier it is to be plastically deformed, and the stronger the hose tightening force is. Therefore, if the wall thickness of the cylindrical part of the hose fitting made by the conventional manufacturing method is uneven,
The tightening force of the hose was uneven, and the conditions were not the best.

As a method for making the wall thickness uniform, as shown in FIG. 9, the outer surface of the cup portion 400 is ironed using an ironing die 301 having a predetermined inner diameter while the punch 300 is inserted after deep drawing. Alternatively, there is a method of deep drawing and ironing at the same time. However, this type of external ironing is performed when the workpiece is cup-shaped, and the bottom is pressed with a punch during ironing, so the wall thickness becomes thinner near the bottom, although slightly, resulting in a uniform wall thickness. It was difficult to do so.

Furthermore, in the above-mentioned hose fittings, the flange part needs mechanical strength to be fixed to the attached part.
The thicker the wall thickness, the better. However, because the flange portion and the cylindrical portion are formed from a single metal plate, it has been difficult to satisfy both the strength of the flange portion and the hose fastening force of the cylindrical portion using the conventional WJ construction method. That is, when attempting to form a thin cylindrical portion from a thick metal plate, deep drawing and ironing are required many times, and the thickness J7 becomes non-uniform.

The present invention was made in view of these circumstances, and
The technical challenge is to make the wall thickness of the cylindrical part uniform.

[Means for Solving the Problems 1] The above-described conventional outer surface ironing process involves regulating the inner diameter with a punch and squeezing the outer peripheral surface with a die to obtain a uniform thickness. However, it is difficult to make the outer diameter completely uniform. In other words, since the punch presses the bottom, a tensile force is applied to the cup, causing it to expand in the axial direction, thereby reducing its outer diameter.

The present inventors focused on this point and completed the present invention by recalling that ironing is performed with the pressing force of the punch released. That is, the method for manufacturing a hose fitting of the present invention comprises a cylindrical portion and a flange portion formed at the peripheral edge of one end of the cylindrical portion, and the hose is inserted into the cylindrical portion and fixed to the hose by caulking the cylindrical portion. A method for manufacturing metal fittings,
The first step is to form a bottomed cup portion by deep drawing a metal plate.
a second step of removing the bottom of the cup portion, and a third step of ironing one inner circumferential surface while regulating the outer diameter of the bottomed cup portion to form a cylindrical portion with a uniform wall thickness; It is characterized by carrying out the following.

The first step is to form a bottomed cylindrical cup portion by deep drawing as in the conventional method. Mild steel is usually used as the material for the metal plate. The deep drawing process is usually carried out using a punch and die, but it can also be carried out by the Gurin method, Marform method, or hydroform method, in which either the punch or the die is made of a flexible substance such as rubber or liquid. can. In this first step, a cup portion of a predetermined size is usually formed by performing deep drawing multiple times while successively reducing the diameters of the punch and die.

The second step is a step of handling the bottom of the cup portion, and can be performed using conventional methods such as cutting, punching, drilling, and cutting with a cutting tool.

Step 3/2, which is a feature of the present invention, is a step of forming a cylindrical portion by ironing the inner peripheral surface while regulating the outer diameter of the bottomed cup portion. For example, a cup portion with a hollow bottom is inserted into the hole of a jig having a predetermined inner diameter, and a rod having an outer diameter larger than the inner diameter of the cup portion is press-fitted into the cup portion from the flange side. As a result, a cylindrical portion having uniform inner and outer diameters is formed. Further, even if an acute angle portion is formed in the second step, the surface becomes smooth in the third step, and there is no need for burring.

[Operations and Effects of the Invention] In the manufacturing method of the present invention, the bottom of the cup portion is treated in the second step, and the inner circumferential surface of the cup portion is treated in the third step with the outer diameter of the cup portion being specified υj. It is ironed. In this third step, for example, a punch having an outer diameter larger than the inner diameter of the cup part and a die regulating the outer diameter of the cup part are used, and as the punch moves forward, the inner diameter of the cup part expands. At this time, since the cup part has no bottom, no tensile force acts on the cup part in front of the punch, and the wall thickness of the cup part is determined by the clearance between the punch and the die.

As a result, a cylindrical portion having a uniform wall thickness can be obtained.

That is, according to the manufacturing method of the present invention, it is possible to easily and reliably manufacture a hose fitting having two cylindrical portions with uniform wall thickness. Furthermore, even if the metal plate has a large wall thickness, it can be reduced to about half the thickness of the flange portion in the third step while maintaining uniformity in the wall thickness of the cylindrical portion. Therefore, a hose fitting that satisfies both the mechanical action of the flange portion and the fastening force of the hose can be obtained. Furthermore, since ironing is performed in the conventional burring process, an increase in the number of processes is prevented.

[Example 1] Hereinafter, the present invention will be specifically described by way of examples with reference to the drawings. In this embodiment, as shown in FIG.
This is to manufacture a hose fitting consisting of a flange portion 2 having a diameter of 0.

(First step) Prepare a plate punched into a predetermined shape from mild steel, and
As shown in the drawings and FIG. 4, the cup portion 10 is formed by holding it between the die 3 and the wrinkle presser 4 and performing deep drawing with the punch 5.

At this time, deep drawing is performed a plurality of times, first using a punch 5 with a large diameter and then sequentially using punches 5 with a smaller diameter. The formed cup part 10 has a wall thickness that becomes thinner as it approaches the bottom part 11, as in the conventional case, and has a flange part 2 protruding from the periphery of the end face.

(Second Step N) Next, handle the bottom 11 of the cup portion 10 with a punch or the like. The formed metal fitting consists of a cup part 10 with the bottom part 11 cut out and a flange part 2, as shown in FIG. 5, and if the inner periphery of the cup part 10 is burred, a conventional hose fitting can be obtained. That is, the wall thickness of the cup portion 10 where the bottom portion 11 is treated is such that the tip of the cup portion 10 is thinner.

(Third Step) Next, the cup portion 10 with the bottom portion 11 treated is inserted into a die 30 having a predetermined inner diameter, and the flange portion 2 is sandwiched between the die 30 and the wrinkle holding plate 4. Then, as shown in FIGS. 1 and 2, a punch 50 having an outer diameter larger than the inner diameter of the cup portion 10 is press-fitted from the opening on the flange portion 2 side of the cup portion 10. As a result, the inner surface of the cup portion 10 is squeezed to have a uniform thickness determined by the clearance between the die 30 and the punch 50.

Bolt holes 20 are then punched out, and if necessary, the tip of the cup portion 10 is cut off to obtain the hose fitting shown in FIG. 6. In this hose fitting, the cylindrical part 1 is the flange part 2.
The wall thickness was approximately half that of the 100mm diameter, and the wall thicknesses in the axial and circumferential directions were uniform. Therefore, the flange portion 2 has excellent mechanical strength, and the cylindrical portion 1 is easily and uniformly plastically deformed by the crimping force, so that it is immersed in the fastening force of the hose.

[Brief explanation of the drawing]

1 to 6 are diagrams explaining the manufacturing method of an embodiment of the present invention, and FIGS. 1 and 2 are explanatory cross-sectional views showing the state in which the third step is being performed, and Figure 4 and Figure 4 are explanatory cross-sectional views showing the state in which the first process is being performed, Figure 5 is a cross-sectional view of the workpiece immediately after the second process, and Figure 6 is a (q) hose 7 is a front view of a hose fitting formed by the conventional iV, !7j method, FIG. 8 is a sectional view of the hose fitting shown in FIG. It is an explanatory sectional view showing a state in which the outer surface is ironed. 1... Cylindrical part 2... Flange part 3.3
0...Dice 4...Wrinkle press plate 5.50...
・Punch 10...Cup part 11...Bottom part
20...Bolt hole Figure 1, Figure 6g

Claims (1)

[Claims] (1) Method for manufacturing a hose fitting consisting of a cylindrical portion and a flange portion formed on the peripheral edge of one end of the cylindrical portion, in which a hose is inserted into the cylindrical portion and fixed to the hose by caulking the cylindrical portion A first method of forming a bottomed cup portion by deep drawing a metal plate;
a second step of removing the bottom of the cup portion; and a third step of ironing the inner circumferential surface of the bottomed cup portion while regulating its outer diameter to form the cylindrical portion having a uniform wall thickness. A method for manufacturing a hose fitting, comprising the steps of: