HOSE JOINT, INTERMEDIATE PREFORM MATERIAL FOR PREPARING THE SAME JOINT, AND HOSE ASSEMBLY USING IT DESCRIPTION OF THE INVENTION This invention relates to a hose splice, an intermediate preform material for making it and a hose assembly using the same splice, and more particularly with a hose splice, an intermediate preform material to make it and a hose assembly using the same splice, which is suitable for an industrial hose, such as a brake hose. A hose splice or hose nozzle, such as the one used when considering its disassembly, reliability and leak-proof functions. A conventional hose splice comprises a tubular nipple portion having an axial hole, a tubular sleeve portion axially extended on the nipple portion, and a head portion, at one end of which one end of the portion of the nipple portion. nipple and the sleeve portion are joined, so that the axial hole is provided therethrough. In general, the head portion is provided internally with a female thread by which the hose splice is connected to a nozzle member. These types of hose splicing or hose nozzle have been produced according to a variety of methods, such as (a) cutting each portion of the hose splice from a preform material, (b) producing a nipple portion, a portion of sleeve and a body portion including a separate head portion and jointly securing the severed portions when welding strong, (c) securing a body portion including a head portion and a separately separated sleeve portion by caulking. However, according to the first method, there are disadvantages as it is not suitable for mass production because the cut generates a large amount of chips and its relatively low operating speed results in high costs. In addition to this, it causes lack of stability in the finished dimensions. The second method of brazing has an advantage in mass production. Figure 1 shows an example of a conventional hose splice produced by this method. This hose splice 10 separately comprises an inner tube 11 and an outer tube 12. The outer tube 12 includes a head portion 12, a sleeve portion 14 extended from one end of the head portion 13, a female thread 15 internally provided in the side wall of a hole 22 produced at the other end of the head portion 13, an annular groove 16 and a flange portion 17 at its periphery. The inner tube 11 comprises a conical seal portion 18, a nipple portion 19, and a flange portion 23 so that an axial hole 20 is provided therethrough, as shown in Figure 2A. The inner tube 11 is formed by a plastic deformation using a matrix, while the outer tube 12 is generally produced from a round rod or a tube by cutting. The inner tube 11 is inserted into an internal hole 24 of the outer tube 24 (see FIG. 2B), so that the flange portion 23 fits with the internal hole 24, and is secured to the outer tube 24 by brazing using a solder. copper, etc. The sleeve portion 14 and the nipple portion 19 produce a cylindrical receiving cavity 21 in which one end of the hose member is inserted and secured upon folding. Figure 3 also shows a similar conventional hose joint, where similar parts are indicated by similar reference numbers as used in Figure 1. In this case, the annular groove with a similar pitch is provided in the periphery of the portion 13. Because the brazing is carried out at a temperature higher than the melting point of a weld, for example, it is carried out at a temperature of 1, 100-1, 150 ° C for the copper welding. However, according to the second method, there are the disadvantages indicated below. (1) Cutting is necessary to form the nipple portion 11. This generates chips as waste and the production yield is not good. (2) the portion of nipple 19 is so small in diameter and so long that it takes a longer time to produce the axial hole 20. The orifice may be oblique, which results in a deterioration of the folding conditions. (3) at least the inner tube 11 and the outer tube 12 must be produced separately. The flange portion 23 and the inner hole need to be made with precise dimensions so that they fit together securely and welded together. This requires more stages for manufacturing and quality management and is not cost effective. (4) The heat of the brazing reheats the nipple portion 19 and makes it softer. As a result, the nipple portion 19 is easy to disintegrate when the sleeve portion 14 is folded together with the hose member. (5) Fluid leakage may occur due to an incomplete seal or improper weld of a joint, such as by skipping the stage and detaching the weld. (6) the portion of nipple 19 can be adjusted eccentrically in the inner hole 24, which causes a difficulty in inserting one end of the hose member. According to the third method for securing a body portion and a sleeve portion together by caulking, this has been considered because it has advantages of fewer manufacturing steps, less chance of the nipple disintegrating and low cost. However, there are disadvantages, since leakage of fluid from a joint is more likely than with the brazing method, and can not be practically implemented. On the other hand, in addition to the conventional hose splices having female threads shown in Figures 1 and 3, other types of hose splices are known. Figure 4 shows a conventional hose splice having a male thread 40, which also separately comprises an inner tube 41 as a nipple portion, and an outer tube 42. The outer tube 42 includes a head portion 43, a sleeve portion 44 extended from one end of the head portion 43, a male thread 45 externally provided on the periphery of the head portion 43, a flange portion 17 at its periphery. One end of the inner tube or nipple portion 41 is inserted into a hole 46, so that the axial hole 20 is provided therethrough.
Figure 5 shows a conventional hose splice having an eye ring 50, which comprises an inner tube or nipple portion 59, a sleeve portion 54, and a head portion 53. The head portion 53 includes a ring of eye 53a, which provides an eye opening 53b, and a neck portion 53c for joining eyeglass 53a to sleeve portion 54. One end of nipple portion 59 is inserted into a hollow portion of the portion 53c neck and joins it. Figure 6 shows a conventional hose, which comprises a nipple portion 69, a sleeve portion 64 and a flat head portion 63 having a cross-section of rectangular configuration. The flat head portion 63 is provided with an opening 67 and a female thread 65 at one end of the axial hole 66, which is bent into an L-shaped configuration within the flat head portion 63. The nipple portion 69 and the Cuff portion 64 is fixed co-axially to a surface in which an opening is located at the other end of the orifice 66. Despite these variations of the head portions, the sleeve portion and the nipple portion need to have different hardnesses. . In case the sleeve portion is harder than a certain hardness, it can fracture due to the folding operation, causing the possibility of seal deterioration, or deviation of the internal diameter of the hose member. In accordance with conventional hose splices, the inner tube or nipple portion is made of a relatively harder material similar to chrome-molybdenum steel, while the outer tube or sleeve portion 91 is made of steel. Therefore, there is a disadvantage in that the mechanical strength of a female or male thread is insufficient to ensure that the seal between the hose splice and the nozzle member is water-tight. Because the female or male thread is formed internally or externally in or on a head portion by a similar machining, which are made from the same material as the external tube or sleeve portion, the female or male thread may not be the same as the male thread. hard enough to prevent breakage or transfer enough stress to the seal portion of the hose splice. Accordingly, it is an object of the invention to provide a hose splice, an intermediate preform material for making it, and a hose assembly employing the same splice, which can be manufactured at a lower cost and suitable to be produced in dough. It is a further object of the invention to provide a hose splice and hose assembly employing the same splice, which can improve reliability. It is still a further object of the invention to provide a method for making a hose splice by which a manufacturing process is simplified and the machining process is reduced as much as possible. It is still a further object of the invention to provide a hose splice, which prevents the inner tube or nipple portion from being disintegrated by the folding operation. According to the first feature of the invention, a hose splice comprises: a tubular nipple portion having an axial hole; a tubular sleeve portion axially extended on the nipple portion; and a head portion at one end of which one end of the nipple portion and the sleeve portion are joined, so that an axial hole is provided therethrough; wherein the nipple portion, the sleeve portion and the head portion are formed of a preform material, when at least one nipple portion is formed by plastic deformation. According to the third feature of the invention, a double, coaxial tubular structure comprises: an internal tubular portion having an axial hole;
an external tubular portion axially extended over the internal tubular portion; and a base portion, at one end of which one end of the nipple portion and the sleeve portion are joined so that the axial hole is provided therethrough; wherein the inner tubular portion, the outer tubular portion and the base portion are formed of a preform material, and the inner tubular portion is harder than the outer tubular portion. According to the fourth feature of the invention, a brake hose splice assembly comprises: a hose member and a hose splice connected at least to one end of said hose member, the hose splice comprises: a portion of tubular nipple having an axial hole; a tubular sleeve portion axially extended on the nipple portion, at least one end of the hose member is inserted into a cavity between the nipple portion and the sleeve portion to be secured; and a head portion, at one end of which one end of the nipple portion and the sleeve portion are joined, so that the axial hole is provided therethrough; wherein the nipple portion, the sleeve portion and the head portion are formed of a preform material, and the nipple portion is harder than the sleeve portion. According to the fifth feature of the invention, a method for manufacturing a hose splice from an intermediate preform material by a plastic deformation, the intermediate preform material comprises a cylindrical projecting portion; a tubular sleeve portion axially extended on the projecting portion; and a head portion at one end of which one end of the projecting portion and the sleeve portion are joined; wherein the protruding portion, the sleeve portion and the head portion are formed of a preform material; the method comprises the step of: deforming the plastic of the projecting portion to form a tubular nipple portion. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail in conjunction with the accompanying drawings, in which: Figure 1 is a cross-sectional view showing a conventional hose splice, Figures 2A and 2B are cross-sectional views that respectively show an inner tube and an outer tube used for the conventional hose splice shown in Figure 1, Figures 3, 4, 5 and 6 are views similar to Figure 1, but show respectively different types of conventional hose splices , Figure 7 is a cross-sectional view showing a hose splice in a first preferred embodiment according to the invention, Figures 8A, 8B, 8C and 8D are cross-sectional views showing a method for making the splice hose shown in Figure 7, which employs an intermediate preform material in a first preferred embodiment, Figure 9 is a transverse sectional view. ersal showing a hose splice in a second preferred embodiment according to the invention, Figures 10A and 10B are cross-sectional views showing a hose splice in a third preferred embodiment according to the invention, Figure 11 is a similar view to Figure 7, but showing a hose splice in a fourth preferred embodiment according to the invention, Figure 12 is a view similar to Figure 7, but showing a hose splice in a fifth preferred embodiment of According to the invention, Figure 13 is a view similar to Figure 7, but showing a hose splice in a sixth preferred embodiment according to the invention, Figure 14 is a view similar to Figure 7, but showing a hose splice in a seventh preferred embodiment according to the invention, Figures 15 to 31 are views similar to the
Figure 8A, but showing respectively the intermediate preform materials in a second to a seventeenth preferred embodiments according to the invention; and Figure 31 is a cross-sectional view showing a hose assembly in a preferred embodiment according to the invention. invention. In Figure 7 a hose or hose nozzle splice in the first preferred embodiment will be explained. The hose splice 100 comprises an inner tube or a tubular nipple portion 101, an outer tube or a tubular sleeve portion 102 co-axially extended over the nipple portion 101, and a head portion 103. One of the ends of the nipple portion 101 and the sleeve portion 102 are joined together to one end of the head portion 103, so that an axial hole 110 extends from the nipple portion 101 through the head portion 103. In the invention, the nipple portion 101, the sleeve portion 102 and the head portion 103 are necessarily formed of a preform material. The head portion 103 is provided with a hole 109 at an end opposite the end where the nipple portion 101 and the sleeve portion 102 are joined. Further, the head portion 103 is internally provided with a female thread 105 along the periphery of the hole 109 and a conical seal portion 108 on its bottom. The nipple portion 101 is as long as the sleeve portion 102, ie, Ll, and has an axial hole 110, whereby the external and internal diameters of the nipple portion 101 respectively are di and d2. For example, Ll = 18 mm, dl = 3.5 mm and d2 = 2.3. The sleeve portion 102 has an internal diameter, which suitably receives one end of the hose member (not shown) within the receiving cavity 111 formed by the periphery of the nipple portion 101, an inner wall of the portion of sleeve 102 and a central wall portion 104. The head portion 103 is provided with an annular groove 106 and an annular flange portion 107 on its periphery. In the first preferred embodiment, the nipple portion 101, the sleeve portion 102 and the head portion 103 are not necessarily formed from a preform material, but also the nipple portion 101 is formed at least from a plastic deformation , as it is understood by the following process to elaborate the hose connection in the first preferred embodiment. (a) forming an intermediate preform material, As a first step, in Figure 8A shown an intermediate preform material 300 is formed. The intermediate preform material 300 comprises a cylindrical projecting portion 301 which is to be subsequently formed as a portion of tubular nipple by plastic deformation, a tubular sleeve portion 302 axially extended on the projecting portion 301, and a base portion 303, at one end of which one end of the projecting portion 301 and the sleeve portion 302 join. The projecting portion 301, the sleeve portion 302 and the head portion 309 are formed of a preform material. The base portion 303 is preferably provided with a preliminary hole 309 at an opposite end of the head portion 303, in which a female thread is subsequently formed. The projecting portion 301 is shorter than the sleeve portion 302 in its axial lengths, and preferably, its volume and external diameter are substantially equal to those of the nipple portion 101 which will subsequently be formed by the plastic deformation. For example, the diameter d3, the length L2 of the projecting portion 301 and the length of the sleeve portion 302 are respectively 3.5 mm, 10 mm and 18 mm. If the intermediate preform material 300 is formed by cold forging a carbon steel wire for cold forging (SWCH12 or SWCH15) or their equivalents, which are subsequently annealed and lubricated, they are preferably used as the starting material. The deformation of plastic can be carried out, such as by a known multi-stage part matrix, however, the intermediate preform material can be produced by machining only, or by the combination of plastic deformation and machining. (b) annealing the intermediate preform material, As a second step, the intermediate preform material 300 is preferably annealed under a previously determined condition, whereby the protruding portion 301 becomes relatively softened so that it can be easily deformed by the plastic deformation in the next stage. The annealing can be carried out under the condition that the intermediate preform material 300 is heated to a temperature between 800 ° C to 900 ° C for about 2 hours, then it is gradually cooled in an oven for more than 7 hours, so that its Rockwell B hardness is below 60. In addition to annealing, lubrication can be carried out. (c) the formation of the nipple portion by deformation of the plastic. Then, the protruding portion 301 is deformed to form the nipple portion 101 by a plastic deformation, as shown in Figure 8B. In this step, an nipple matrix 80, which comprises a fastener 81, a cylindrical punch 82 having an extreme hardness, which is supported in the fastening hole 83 of the fastener 80, and a tubular punching guide 84 extended on the punch 82 from one end of the fastener 81, a fastener 81 is used, which is to be inserted into the sleeve portion 302 of the intermediate preform material. The punch 82 has the same external diameter as the diameter d2 of an axial hole of the nipple portion 101. On the other side, the tubular punching guide 84 has an orifice 84a, whose diameter is the same as the external diameter d3 of the projecting portion 301. To carry out the plastic deformation, the nipple matrix 80 is co-axially positioned with a metal die (not shown), then both the fastener 81 and the punch 82 are moved forward by a hydraulic press. For example, in case the deformation force of the projecting portion 301 is 20 ton / cm2, the punch 82 is pressed against the surface of the tip 301a of the projecting portion 301 with an approximate force of 1 ton. The punch 82 forms an axial hole in the projecting portion 301, and simultaneously extrudes the projecting portion 301 in the guide hole 84a (as shown in Figure 8B by dotted lines 1 and 12) that is, a gap between the wall external of the punch 82 and the inner wall of the punching guide 84 in a backward direction, so that the nipple portion 101 is obtained. In other w, the nipple portion 101 is formed by plastic deformation when extruding backwards in the direction of the holder 81, which functions as a receptacle. The pressure can be carried out by multiple pressing stages. In addition, the surface of the tip 301a is preferably perpendicular to the axis of the projecting portion 301a, in r to prevent the punch 84 from being braked by its oblique condition. (d) punching, the formation of the seal portion and the flange portion, formation of the nipple portion 101, the central wall portion is punched through and in the direction of the bottom surface of the preliminary hole 309. The punch can carried out not only using another hydraulic press machine, but also employing the nipple die 80, wherein the punch 82 can be moved back and forth against the clip for punching the central wall portion 104. At the same time, the conical portion of seal 108 may preferably be formed. For example, the seal portion may be formed by plastic deformation by simultaneously configuring the die or die (not shown) in a certain form. In addition, the flange portion 107 may be formed at the periphery of the base portion 303 by matrix wrought or punching. Then, the hose splice is obtained before the machining operation as shown in Figure 8C. (e) machining, Subsequently the female thread 105 and the annular groove are formed when using a machine tool such as an NCI machine tool, and an automatic lathe. As shown in Figure 8D, a female thread is formed having a length of L4 (for example approximately 10 mm) and an internal diameter of d4 (for example approximately 9 mm) when using a tap (not shown) ). In addition to this, the conical seal portion is terminated so that it has a conical angle 0 (for example of 84 degrees) and its base has a diameter d5 (for example of 7.5 mm), which is suitably larger than the diameter of the axial hole 110. The seal portion can be formed by machining. Finally, the hose joint 100 shown in Figure 7 is obtained. According to the aforementioned method for making a hose joint, because the combination most suitable for the cold forging process of the head portion 103 and of the sleeve portion 102 and thus of the nipple portion 101, the hose joint can be manufactured with stable dimensions, through fewer stages of operation. Therefore, the method is suitable for mass production. In addition, since the cutting process is limited to a small part of the whole process similar to the formation of the female thread 105, the generation can be minimized chips. Further, according to the method explained above, the hose splice 100 has significant characteristics since the nipple portion 101 is harder than the sleeve portion 102 by extrusion backward through the plastic deformation (e.g. the nipple portion has a hardness on the Rockwell B scale of 90-95), whereby it is likely that it will not disintegrate with the folding operation of a hose member (not shown). On the other hand, since the sleeve portion 102 becomes softened by annealing prior to nipple formation (eg, the sleeve portion has a hardness on the Rockwell B scale of 55-60), and the member end Hose (not shown) is easy to attach to the hose connector 100. Because the structure of the hose joint, which is made of a preform material without strong welding or caulking, the water-tight property thereof is improved . Therefore, it can be applicable to high pressure hydraulic pipes. According to the backward extrusion of the nipple portion of the aforementioned method, although the ratio of the diameter of the punch (d2) to the developed length (Ll) is approximately 8, which is larger than a usual proportion of ( 5-6), it will be understood by those skilled in the art that backward extrusion is carried out by applying a high precision hydraulic press, a high precision die and a punch having extreme hardness, etc. In addition, the method can generally be applied to a method for making a double coaxial tubular structure having a similar structure, which includes an internal tubular portion and an outer tubular portion. The preform material from which the hose splice is formed can include copper, aluminum and an alloy comprising both metals. Figure 9 shows a hose splice in a second preferred embodiment according to the invention, wherein similar parts are indicated by reference numbers similar to those used in Figure 7. In the second embodiment, a tapered portion of seal 128 protrudes in the direction of the opening of the hole 109 through a small cylindrical portion 128a, whereby the surface of the tip of the conical seal portion 120 passes through a distal end of the female thread 125.
Figure 10A shows a hose splice in a third embodiment according to the invention, wherein similar parts are indicated by the reference numbers to those used in Figures 7 and 8. In the hose splice 140, the hardness of the nipple portion 141, of the sleeve portion 142 and of the head portion 143 proximate the female thread 105 differs from one relative to the other. As indicated in Figure 10B, the nipple portion 141 at points 141a, 141b and 141c has a hardness on the Vickers scale greater than 160 Hv, preferably 160 Hv to 240 Hv, and most preferably 170 Hv to 190 Hv. Hv. The sleeve portion at points 142a, 142b and 142c has a hardness on the Vickers scale of less than 150 Hv, more preferably from 90 Hv to 150 Hv. The head portion 143 proximate the female thread 105 has a hardness on the Vickers scale of 120 Hv at 189 Hv, more preferably between 150 Hv at 170 Hv. As a result, the nipple portion 141 is harder than the sleeve portion 142, and the head portion 143 proximate the thread portion 105 is harder than the sleeve portion 142. Preferably, the conical seal portion 108 has substantially the same hardness as that of the head portion 143 in proximity to the points 143a, 143b of the female thread 105, which is on a Vickers scale of 150 Hv to 170 Hv. The hose connection in the third embodiment can be manufactured through a process, which is similar to that of manufacturing the first embodiment explained above. (a) formation of the intermediate preform material, As a first step, an intermediate preform material such as that shown in Figure 8A is formed with the same procedure as that of the first embodiment. (b) annealing the intermediate preform material, As a second step, the intermediate preform material is necessarily annealed under a predetermined condition, whereby the protruding portion becomes relatively softened, which can easily be deformed by the plastic deformation in a step followed, and the hardness of the sleeve portion 142 on the Vickers scale, for example, is as hard as 90-150 Hv. (c) forming a nipple portion by plastic deformation. Then, the protruding portion is deformed to form the nipple portion 141 by plastic deformation, as shown in Figure 8B. In this step, the nipple portion 141 is formed by plastic deformation by carrying out a backward extrusion, through which, for example, nipple portion 141 is as hard as 160 to 240 Hv on the scale of Vickers. (d) punching, formation of the seal portion and the flange portion The formation of the nipple portion is followed by punching through the central wall portion 104, and preferably, at the same time, the formation of the Conical portion of seal 108 by plastic deformation. Due to the work hardness of the formation, seal portion 108 has a hardness on the Vickers scale of 150 70 Hv. For example, the seal portion can be formed by a plastic deformation simultaneously when the die is configured (not shown) in a certain way. In addition, the flange portion 107 is formed by a plastic deformation simultaneously through an additional step. On the other hand, the female thread 105 is formed from a plastic deformation by means of a tap. Since the deformation is carried out after the annealing step, the head portion 143 in proximity to the female thread 105 is hardened to be as hard as 120 to 180 Hv on the Vickers scale. (e) machining, Finally, the annular groove 106 is formed by using such an NCI machine tool, and an automatic lathe. According to the hose splice in the third preferred embodiment, since the nipple portion 141 and the sleeve portion are formed of a preform material and the matrix is harder than the latter, and its water-tight property is improved and the nipple portion 141 probably does not disintegrate by the folding operation on a hose member. Thus, it is also suitable for high pressure hydraulic pipes. In addition, since the head portion 143 proximate the female thread is harder than the sleeve portion 142, the thread probably does not break, and the splice strength increases. Although, in the third embodiment, a hose splice having a female thread is disclosed, the invention can be applied to other types of hose splices having a different type of head portion as shown in Figures 11, 12, 13 and 14. Figure 11 shows a hose splice in a fourth preferred embodiment according to the invention. The hose splice 160 has a male thread 165 on the periphery of the head portion 163 and an axial hole 170 is provided through the nipple portion 161 and the head portion 163. The nipple portion 161, the portion of sleeve 162 and head portion 163 are made of a preform material and the hardness of nipple portion 163 proximate the male thread is suitably determined in accordance with the invention. In the embodiment, the male thread can be formed by a plastic deformation. Figure 12 shows a hose splice in a fifth preferred embodiment according to the invention. The hose joint 180 comprises a nipple portion 181, a sleeve portion 180, and a head portion 183, which are formed of a preform material. The head portion 183 includes an eyelet ring 183a, which provides an eye opening 183b and a neck portion 183c for attaching the eyelet ring 183a to the sleeve portion 182. An axial hole 190 extends through the head portion 183a. nipple portion 181 and neck portion 183c. In the embodiment, the sleeve portion 182, the nipple portion 181 and the head portion 183 respectively have a hardness of 90-150 Hv, 150-250 Hv and 90-250 HV on the Vickers scale. For manufacturing the hose joint of the fifth preferred embodiment, an intermediate preform material is formed of a steel preform material with a low carbon content, which contains approximately 0.08% to 0.20% carbon, then annealed under a predetermined condition whereby, the hardness of the sleeve portion becomes 90 to 150 Hv on the Vickers scale. Then, the nipple portion 181 is formed by plastic deformation, through which its hardness becomes 150 to 250 HV on the Vickers scale due to the hardness of the operation. With the ration to the head portion 183, a hardness of 90 to 150 Hv can be obtained on the Vickers scale almost upon completion of the setting before annealing, while a hardness of 150 to 250 on the Vickers scale can be obtained by forming an eyelet ring upon initiation of plastic deformation from a spherical portion of the intermediate preform material, or by forming an eye opening by plastic deformation when puncturing a head portion of an intermediate preform material. Figure 13 shows a hose splice in a sixth preferred embodiment according to the invention, which is a modification of the preferred embodiment. The hose splice 200 comprises a nipple portion 181, a sleeve portion 180, and a head portion 183 that includes an eyelet ring 183a and a neck portion 183c. The nipple portion 182, the sleeve portion 182 and the neck portion 183c of the head portion are formed of a preform material by a plastic deformation, while the nose ring 183a is formed when being cut or cold-formed and is connected to the neck portion 183a by welding or the like. Figure 14 shows a hose splice in the seventh preferred embodiment according to the invention. The hose joint 220 comprises a nipple portion 221 having an axial hole 230, a sleeve portion 220 and a flat head portion 223 having a cross section with a rectangular configuration. The flat head portion 223 is provided with an opening 227 and a female thread 225 and a conical seal portion 228 at one end of the axial hole 230, which extends therethrough and is folded into an L-shaped configuration within the flat head portion 223. The nipple portion 221, the sleeve portion 222 and the flat head portion 223 are formed from a material of The preform, and the hardness of the nipple portion 221, of the sleeve portion 222 and the flat head portion 223 proximate the female thread 225 differs from each other according to the invention. Instead of an intermediate preform material in the aforementioned preferred embodiments according to the invention, such as the one known in Figure 8, a variety of modifications of the intermediate preform material may be possible, as explained below. Figure 15 shows an intermediate preform material in the second preferred embodiment according to the invention, wherein the conical taper seal portion 318 is preformed in the lower part of a hole 309 provided in the head portion 303. The Figure 16 shows an intermediate preform material in the third preferred embodiment according to the invention, wherein an annular flange portion 327 is preformed at the periphery of the head portion 303. Figure 17 shows an intermediate preform material in a fourth preferred embodiment according to the invention, wherein the predetermined depth of the auxiliary hole 335 in the lower part of the hole 309 is provided against a central wall portion 304 with an internal diameter, which corresponds to the diameter of an axial hole. According to the embodiment, the punching of the axial hole through the central wall portion 334 becomes simpler. Figure 18 shows an intermediate preform material in a fifth preferred embodiment according to the invention, wherein a depth The tip orifice predetermined 342 is provided at the tip of the projecting portion 341. In this case, the length of the projecting portion is formed larger than the previous modalities by the volume of the tip hole 342. According to the embodiment, it becomes easier to puncture a punch in the projecting portion by extruding backwards. Figure 19 shows an intermediate preform material in a sixth preferred embodiment according to the invention, wherein both the predetermined depth of the auxiliary hole 335, shown in Figure 17 and the predetermined depth of the tip hole 342, shown in FIG. Figure 18. According to the embodiment, backward extrusion becomes easier by punching the axial hole through the central wall portion 334 and pushing the punch into the projecting portion. Figure 20 shows an intermediate preform material in a seventh preferred embodiment according to the invention, wherein a conical taper seal portion 368 is provided with an auxiliary hole 335. Figure 21 shows an intermediate preform material in an eighth embodiment preferred according to the invention, wherein the conical tapered seal portion 318 and the tip hole 342 are provided at the tip of the projecting portion 341. Figure 22 shows an intermediate preform material in a ninth preferred embodiment in accordance with The invention, wherein a conical taper seal portion 368 having an auxiliary hole 335 and a tip hole 342 is provided at the tip of the projecting portion 341. Figure 23 shows an intermediate preform material in a tenth preferred embodiment of the invention. according to the invention, wherein an auxiliary hole 335 and a flange portion 397 are previously provided in the peri fair of the head portion 303. Figure 24 shows an intermediate preform material in a tenth preferred embodiment according to the invention, wherein a tip hole 342 and a flange portion 397 are previously provided. Figure 25 shows an intermediate preform material in a tenth preferred embodiment according to the invention, wherein an auxiliary hole, a tip hole 342 and a flange portion 397 are previously provided. Figure 26 shows an intermediate preform material in a thirteenth preferred embodiment according to the invention, wherein a tapered portion is provided. of female seal 425 on bottom of a hole of head portion 303, a flange portion 397 is provided on its periphery. The female seal portion 425 can preferably be formed by cutting the punch with a longer life span of a punching die to be used in a forward direction. According to the embodiment, the central wall portion is thinner near the axis where the punching is carried out, with which the punching becomes easier. In the modality, the tab portion may be optional. Figure 27 shows an intermediate preform material in a fourteen preferred embodiment according to the invention, wherein a conical portion of female seal 425 is additionally provided with an auxiliary hole 435, which corresponds to the axial hole, which is deep as its lower part, it almost reaches the surface of the central wall portion 434. According to the embodiment, the punching of the central wall portion becomes simpler. Figure 28 shows an intermediate preform material in a fifteenth embodiment of the invention, wherein a conical female seal portion 425, a tip hole 342 and an annular flange portion are provided. Figure 29 shows an intermediate preform material in a sixteenth preferred embodiment according to the invention, wherein a conical female seal portion 425 having an auxiliary hole 435, a tip hole 342 and an annular flange portion are provided. . Figure 30 shows an intermediate preform material in a seventeenth embodiment according to the invention, wherein a central wall portion is thicker than the aforementioned embodiment by a thickness t, and the projecting portion 461 extruded above the surface At the end of the sleeve portion, both the projecting portion 461 and the sleeve portion 462 are shorter than the aforementioned embodiment. For the manufacture of a hose fitting employing the embodiment, a nipple portion is formed by plastic deformation through a backward extrusion, and at the same time, the nipple portion and the sleeve portion extend in the direction of back in a tubular shape by the deformation of the thick portion (t) of the central wall portion 464. Figure 31 shows a hose assembly in a preferred embodiment according to the invention. The hose joints 100 are fixed both at the end of the hose member 501 by inserting each end into a receiving cavity formed between the nipple portion 101 and the sleeve portion 102. The sleeve portion is folded at 502, slightly around from the end of the hose member 501, then the hose assembly 500 is obtained. Although the invention has been described with respect to the specific embodiment for a complete and clear disclosure, the appended claims will not be limited in this manner but are constructed to incorporate all the modifications and alternative constructions that can occur to a person with experience in the technique that fall clearly within the basic teachings expressed in the present.